linux/drivers/firewire/ohci.c
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   1/*
   2 * Driver for OHCI 1394 controllers
   3 *
   4 * Copyright (C) 2003-2006 Kristian Hoegsberg <krh@bitplanet.net>
   5 *
   6 * This program is free software; you can redistribute it and/or modify
   7 * it under the terms of the GNU General Public License as published by
   8 * the Free Software Foundation; either version 2 of the License, or
   9 * (at your option) any later version.
  10 *
  11 * This program is distributed in the hope that it will be useful,
  12 * but WITHOUT ANY WARRANTY; without even the implied warranty of
  13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14 * GNU General Public License for more details.
  15 *
  16 * You should have received a copy of the GNU General Public License
  17 * along with this program; if not, write to the Free Software Foundation,
  18 * Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
  19 */
  20
  21#include <linux/bitops.h>
  22#include <linux/bug.h>
  23#include <linux/compiler.h>
  24#include <linux/delay.h>
  25#include <linux/device.h>
  26#include <linux/dma-mapping.h>
  27#include <linux/firewire.h>
  28#include <linux/firewire-constants.h>
  29#include <linux/init.h>
  30#include <linux/interrupt.h>
  31#include <linux/io.h>
  32#include <linux/kernel.h>
  33#include <linux/list.h>
  34#include <linux/mm.h>
  35#include <linux/module.h>
  36#include <linux/moduleparam.h>
  37#include <linux/mutex.h>
  38#include <linux/pci.h>
  39#include <linux/pci_ids.h>
  40#include <linux/slab.h>
  41#include <linux/spinlock.h>
  42#include <linux/string.h>
  43#include <linux/time.h>
  44#include <linux/vmalloc.h>
  45#include <linux/workqueue.h>
  46
  47#include <asm/byteorder.h>
  48#include <asm/page.h>
  49
  50#ifdef CONFIG_PPC_PMAC
  51#include <asm/pmac_feature.h>
  52#endif
  53
  54#include "core.h"
  55#include "ohci.h"
  56
  57#define DESCRIPTOR_OUTPUT_MORE          0
  58#define DESCRIPTOR_OUTPUT_LAST          (1 << 12)
  59#define DESCRIPTOR_INPUT_MORE           (2 << 12)
  60#define DESCRIPTOR_INPUT_LAST           (3 << 12)
  61#define DESCRIPTOR_STATUS               (1 << 11)
  62#define DESCRIPTOR_KEY_IMMEDIATE        (2 << 8)
  63#define DESCRIPTOR_PING                 (1 << 7)
  64#define DESCRIPTOR_YY                   (1 << 6)
  65#define DESCRIPTOR_NO_IRQ               (0 << 4)
  66#define DESCRIPTOR_IRQ_ERROR            (1 << 4)
  67#define DESCRIPTOR_IRQ_ALWAYS           (3 << 4)
  68#define DESCRIPTOR_BRANCH_ALWAYS        (3 << 2)
  69#define DESCRIPTOR_WAIT                 (3 << 0)
  70
  71struct descriptor {
  72        __le16 req_count;
  73        __le16 control;
  74        __le32 data_address;
  75        __le32 branch_address;
  76        __le16 res_count;
  77        __le16 transfer_status;
  78} __attribute__((aligned(16)));
  79
  80#define CONTROL_SET(regs)       (regs)
  81#define CONTROL_CLEAR(regs)     ((regs) + 4)
  82#define COMMAND_PTR(regs)       ((regs) + 12)
  83#define CONTEXT_MATCH(regs)     ((regs) + 16)
  84
  85#define AR_BUFFER_SIZE  (32*1024)
  86#define AR_BUFFERS_MIN  DIV_ROUND_UP(AR_BUFFER_SIZE, PAGE_SIZE)
  87/* we need at least two pages for proper list management */
  88#define AR_BUFFERS      (AR_BUFFERS_MIN >= 2 ? AR_BUFFERS_MIN : 2)
  89
  90#define MAX_ASYNC_PAYLOAD       4096
  91#define MAX_AR_PACKET_SIZE      (16 + MAX_ASYNC_PAYLOAD + 4)
  92#define AR_WRAPAROUND_PAGES     DIV_ROUND_UP(MAX_AR_PACKET_SIZE, PAGE_SIZE)
  93
  94struct ar_context {
  95        struct fw_ohci *ohci;
  96        struct page *pages[AR_BUFFERS];
  97        void *buffer;
  98        struct descriptor *descriptors;
  99        dma_addr_t descriptors_bus;
 100        void *pointer;
 101        unsigned int last_buffer_index;
 102        u32 regs;
 103        struct tasklet_struct tasklet;
 104};
 105
 106struct context;
 107
 108typedef int (*descriptor_callback_t)(struct context *ctx,
 109                                     struct descriptor *d,
 110                                     struct descriptor *last);
 111
 112/*
 113 * A buffer that contains a block of DMA-able coherent memory used for
 114 * storing a portion of a DMA descriptor program.
 115 */
 116struct descriptor_buffer {
 117        struct list_head list;
 118        dma_addr_t buffer_bus;
 119        size_t buffer_size;
 120        size_t used;
 121        struct descriptor buffer[0];
 122};
 123
 124struct context {
 125        struct fw_ohci *ohci;
 126        u32 regs;
 127        int total_allocation;
 128        u32 current_bus;
 129        bool running;
 130        bool flushing;
 131
 132        /*
 133         * List of page-sized buffers for storing DMA descriptors.
 134         * Head of list contains buffers in use and tail of list contains
 135         * free buffers.
 136         */
 137        struct list_head buffer_list;
 138
 139        /*
 140         * Pointer to a buffer inside buffer_list that contains the tail
 141         * end of the current DMA program.
 142         */
 143        struct descriptor_buffer *buffer_tail;
 144
 145        /*
 146         * The descriptor containing the branch address of the first
 147         * descriptor that has not yet been filled by the device.
 148         */
 149        struct descriptor *last;
 150
 151        /*
 152         * The last descriptor in the DMA program.  It contains the branch
 153         * address that must be updated upon appending a new descriptor.
 154         */
 155        struct descriptor *prev;
 156
 157        descriptor_callback_t callback;
 158
 159        struct tasklet_struct tasklet;
 160};
 161
 162#define IT_HEADER_SY(v)          ((v) <<  0)
 163#define IT_HEADER_TCODE(v)       ((v) <<  4)
 164#define IT_HEADER_CHANNEL(v)     ((v) <<  8)
 165#define IT_HEADER_TAG(v)         ((v) << 14)
 166#define IT_HEADER_SPEED(v)       ((v) << 16)
 167#define IT_HEADER_DATA_LENGTH(v) ((v) << 16)
 168
 169struct iso_context {
 170        struct fw_iso_context base;
 171        struct context context;
 172        void *header;
 173        size_t header_length;
 174        unsigned long flushing_completions;
 175        u32 mc_buffer_bus;
 176        u16 mc_completed;
 177        u16 last_timestamp;
 178        u8 sync;
 179        u8 tags;
 180};
 181
 182#define CONFIG_ROM_SIZE 1024
 183
 184struct fw_ohci {
 185        struct fw_card card;
 186
 187        __iomem char *registers;
 188        int node_id;
 189        int generation;
 190        int request_generation; /* for timestamping incoming requests */
 191        unsigned quirks;
 192        unsigned int pri_req_max;
 193        u32 bus_time;
 194        bool bus_time_running;
 195        bool is_root;
 196        bool csr_state_setclear_abdicate;
 197        int n_ir;
 198        int n_it;
 199        /*
 200         * Spinlock for accessing fw_ohci data.  Never call out of
 201         * this driver with this lock held.
 202         */
 203        spinlock_t lock;
 204
 205        struct mutex phy_reg_mutex;
 206
 207        void *misc_buffer;
 208        dma_addr_t misc_buffer_bus;
 209
 210        struct ar_context ar_request_ctx;
 211        struct ar_context ar_response_ctx;
 212        struct context at_request_ctx;
 213        struct context at_response_ctx;
 214
 215        u32 it_context_support;
 216        u32 it_context_mask;     /* unoccupied IT contexts */
 217        struct iso_context *it_context_list;
 218        u64 ir_context_channels; /* unoccupied channels */
 219        u32 ir_context_support;
 220        u32 ir_context_mask;     /* unoccupied IR contexts */
 221        struct iso_context *ir_context_list;
 222        u64 mc_channels; /* channels in use by the multichannel IR context */
 223        bool mc_allocated;
 224
 225        __be32    *config_rom;
 226        dma_addr_t config_rom_bus;
 227        __be32    *next_config_rom;
 228        dma_addr_t next_config_rom_bus;
 229        __be32     next_header;
 230
 231        __le32    *self_id_cpu;
 232        dma_addr_t self_id_bus;
 233        struct work_struct bus_reset_work;
 234
 235        u32 self_id_buffer[512];
 236};
 237
 238static inline struct fw_ohci *fw_ohci(struct fw_card *card)
 239{
 240        return container_of(card, struct fw_ohci, card);
 241}
 242
 243#define IT_CONTEXT_CYCLE_MATCH_ENABLE   0x80000000
 244#define IR_CONTEXT_BUFFER_FILL          0x80000000
 245#define IR_CONTEXT_ISOCH_HEADER         0x40000000
 246#define IR_CONTEXT_CYCLE_MATCH_ENABLE   0x20000000
 247#define IR_CONTEXT_MULTI_CHANNEL_MODE   0x10000000
 248#define IR_CONTEXT_DUAL_BUFFER_MODE     0x08000000
 249
 250#define CONTEXT_RUN     0x8000
 251#define CONTEXT_WAKE    0x1000
 252#define CONTEXT_DEAD    0x0800
 253#define CONTEXT_ACTIVE  0x0400
 254
 255#define OHCI1394_MAX_AT_REQ_RETRIES     0xf
 256#define OHCI1394_MAX_AT_RESP_RETRIES    0x2
 257#define OHCI1394_MAX_PHYS_RESP_RETRIES  0x8
 258
 259#define OHCI1394_REGISTER_SIZE          0x800
 260#define OHCI1394_PCI_HCI_Control        0x40
 261#define SELF_ID_BUF_SIZE                0x800
 262#define OHCI_TCODE_PHY_PACKET           0x0e
 263#define OHCI_VERSION_1_1                0x010010
 264
 265static char ohci_driver_name[] = KBUILD_MODNAME;
 266
 267#define PCI_DEVICE_ID_AGERE_FW643       0x5901
 268#define PCI_DEVICE_ID_CREATIVE_SB1394   0x4001
 269#define PCI_DEVICE_ID_JMICRON_JMB38X_FW 0x2380
 270#define PCI_DEVICE_ID_TI_TSB12LV22      0x8009
 271#define PCI_DEVICE_ID_TI_TSB12LV26      0x8020
 272#define PCI_DEVICE_ID_TI_TSB82AA2       0x8025
 273#define PCI_VENDOR_ID_PINNACLE_SYSTEMS  0x11bd
 274
 275#define QUIRK_CYCLE_TIMER               1
 276#define QUIRK_RESET_PACKET              2
 277#define QUIRK_BE_HEADERS                4
 278#define QUIRK_NO_1394A                  8
 279#define QUIRK_NO_MSI                    16
 280#define QUIRK_TI_SLLZ059                32
 281
 282/* In case of multiple matches in ohci_quirks[], only the first one is used. */
 283static const struct {
 284        unsigned short vendor, device, revision, flags;
 285} ohci_quirks[] = {
 286        {PCI_VENDOR_ID_AL, PCI_ANY_ID, PCI_ANY_ID,
 287                QUIRK_CYCLE_TIMER},
 288
 289        {PCI_VENDOR_ID_APPLE, PCI_DEVICE_ID_APPLE_UNI_N_FW, PCI_ANY_ID,
 290                QUIRK_BE_HEADERS},
 291
 292        {PCI_VENDOR_ID_ATT, PCI_DEVICE_ID_AGERE_FW643, 6,
 293                QUIRK_NO_MSI},
 294
 295        {PCI_VENDOR_ID_CREATIVE, PCI_DEVICE_ID_CREATIVE_SB1394, PCI_ANY_ID,
 296                QUIRK_RESET_PACKET},
 297
 298        {PCI_VENDOR_ID_JMICRON, PCI_DEVICE_ID_JMICRON_JMB38X_FW, PCI_ANY_ID,
 299                QUIRK_NO_MSI},
 300
 301        {PCI_VENDOR_ID_NEC, PCI_ANY_ID, PCI_ANY_ID,
 302                QUIRK_CYCLE_TIMER},
 303
 304        {PCI_VENDOR_ID_O2, PCI_ANY_ID, PCI_ANY_ID,
 305                QUIRK_NO_MSI},
 306
 307        {PCI_VENDOR_ID_RICOH, PCI_ANY_ID, PCI_ANY_ID,
 308                QUIRK_CYCLE_TIMER | QUIRK_NO_MSI},
 309
 310        {PCI_VENDOR_ID_TI, PCI_DEVICE_ID_TI_TSB12LV22, PCI_ANY_ID,
 311                QUIRK_CYCLE_TIMER | QUIRK_RESET_PACKET | QUIRK_NO_1394A},
 312
 313        {PCI_VENDOR_ID_TI, PCI_DEVICE_ID_TI_TSB12LV26, PCI_ANY_ID,
 314                QUIRK_RESET_PACKET | QUIRK_TI_SLLZ059},
 315
 316        {PCI_VENDOR_ID_TI, PCI_DEVICE_ID_TI_TSB82AA2, PCI_ANY_ID,
 317                QUIRK_RESET_PACKET | QUIRK_TI_SLLZ059},
 318
 319        {PCI_VENDOR_ID_TI, PCI_ANY_ID, PCI_ANY_ID,
 320                QUIRK_RESET_PACKET},
 321
 322        {PCI_VENDOR_ID_VIA, PCI_ANY_ID, PCI_ANY_ID,
 323                QUIRK_CYCLE_TIMER | QUIRK_NO_MSI},
 324};
 325
 326/* This overrides anything that was found in ohci_quirks[]. */
 327static int param_quirks;
 328module_param_named(quirks, param_quirks, int, 0644);
 329MODULE_PARM_DESC(quirks, "Chip quirks (default = 0"
 330        ", nonatomic cycle timer = "    __stringify(QUIRK_CYCLE_TIMER)
 331        ", reset packet generation = "  __stringify(QUIRK_RESET_PACKET)
 332        ", AR/selfID endianess = "      __stringify(QUIRK_BE_HEADERS)
 333        ", no 1394a enhancements = "    __stringify(QUIRK_NO_1394A)
 334        ", disable MSI = "              __stringify(QUIRK_NO_MSI)
 335        ", TI SLLZ059 erratum = "       __stringify(QUIRK_TI_SLLZ059)
 336        ")");
 337
 338#define OHCI_PARAM_DEBUG_AT_AR          1
 339#define OHCI_PARAM_DEBUG_SELFIDS        2
 340#define OHCI_PARAM_DEBUG_IRQS           4
 341#define OHCI_PARAM_DEBUG_BUSRESETS      8 /* only effective before chip init */
 342
 343static int param_debug;
 344module_param_named(debug, param_debug, int, 0644);
 345MODULE_PARM_DESC(debug, "Verbose logging (default = 0"
 346        ", AT/AR events = "     __stringify(OHCI_PARAM_DEBUG_AT_AR)
 347        ", self-IDs = "         __stringify(OHCI_PARAM_DEBUG_SELFIDS)
 348        ", IRQs = "             __stringify(OHCI_PARAM_DEBUG_IRQS)
 349        ", busReset events = "  __stringify(OHCI_PARAM_DEBUG_BUSRESETS)
 350        ", or a combination, or all = -1)");
 351
 352static void log_irqs(struct fw_ohci *ohci, u32 evt)
 353{
 354        if (likely(!(param_debug &
 355                        (OHCI_PARAM_DEBUG_IRQS | OHCI_PARAM_DEBUG_BUSRESETS))))
 356                return;
 357
 358        if (!(param_debug & OHCI_PARAM_DEBUG_IRQS) &&
 359            !(evt & OHCI1394_busReset))
 360                return;
 361
 362        dev_notice(ohci->card.device,
 363            "IRQ %08x%s%s%s%s%s%s%s%s%s%s%s%s%s%s%s\n", evt,
 364            evt & OHCI1394_selfIDComplete       ? " selfID"             : "",
 365            evt & OHCI1394_RQPkt                ? " AR_req"             : "",
 366            evt & OHCI1394_RSPkt                ? " AR_resp"            : "",
 367            evt & OHCI1394_reqTxComplete        ? " AT_req"             : "",
 368            evt & OHCI1394_respTxComplete       ? " AT_resp"            : "",
 369            evt & OHCI1394_isochRx              ? " IR"                 : "",
 370            evt & OHCI1394_isochTx              ? " IT"                 : "",
 371            evt & OHCI1394_postedWriteErr       ? " postedWriteErr"     : "",
 372            evt & OHCI1394_cycleTooLong         ? " cycleTooLong"       : "",
 373            evt & OHCI1394_cycle64Seconds       ? " cycle64Seconds"     : "",
 374            evt & OHCI1394_cycleInconsistent    ? " cycleInconsistent"  : "",
 375            evt & OHCI1394_regAccessFail        ? " regAccessFail"      : "",
 376            evt & OHCI1394_unrecoverableError   ? " unrecoverableError" : "",
 377            evt & OHCI1394_busReset             ? " busReset"           : "",
 378            evt & ~(OHCI1394_selfIDComplete | OHCI1394_RQPkt |
 379                    OHCI1394_RSPkt | OHCI1394_reqTxComplete |
 380                    OHCI1394_respTxComplete | OHCI1394_isochRx |
 381                    OHCI1394_isochTx | OHCI1394_postedWriteErr |
 382                    OHCI1394_cycleTooLong | OHCI1394_cycle64Seconds |
 383                    OHCI1394_cycleInconsistent |
 384                    OHCI1394_regAccessFail | OHCI1394_busReset)
 385                                                ? " ?"                  : "");
 386}
 387
 388static const char *speed[] = {
 389        [0] = "S100", [1] = "S200", [2] = "S400",    [3] = "beta",
 390};
 391static const char *power[] = {
 392        [0] = "+0W",  [1] = "+15W", [2] = "+30W",    [3] = "+45W",
 393        [4] = "-3W",  [5] = " ?W",  [6] = "-3..-6W", [7] = "-3..-10W",
 394};
 395static const char port[] = { '.', '-', 'p', 'c', };
 396
 397static char _p(u32 *s, int shift)
 398{
 399        return port[*s >> shift & 3];
 400}
 401
 402static void log_selfids(struct fw_ohci *ohci, int generation, int self_id_count)
 403{
 404        u32 *s;
 405
 406        if (likely(!(param_debug & OHCI_PARAM_DEBUG_SELFIDS)))
 407                return;
 408
 409        dev_notice(ohci->card.device,
 410                   "%d selfIDs, generation %d, local node ID %04x\n",
 411                   self_id_count, generation, ohci->node_id);
 412
 413        for (s = ohci->self_id_buffer; self_id_count--; ++s)
 414                if ((*s & 1 << 23) == 0)
 415                        dev_notice(ohci->card.device,
 416                            "selfID 0: %08x, phy %d [%c%c%c] "
 417                            "%s gc=%d %s %s%s%s\n",
 418                            *s, *s >> 24 & 63, _p(s, 6), _p(s, 4), _p(s, 2),
 419                            speed[*s >> 14 & 3], *s >> 16 & 63,
 420                            power[*s >> 8 & 7], *s >> 22 & 1 ? "L" : "",
 421                            *s >> 11 & 1 ? "c" : "", *s & 2 ? "i" : "");
 422                else
 423                        dev_notice(ohci->card.device,
 424                            "selfID n: %08x, phy %d [%c%c%c%c%c%c%c%c]\n",
 425                            *s, *s >> 24 & 63,
 426                            _p(s, 16), _p(s, 14), _p(s, 12), _p(s, 10),
 427                            _p(s,  8), _p(s,  6), _p(s,  4), _p(s,  2));
 428}
 429
 430static const char *evts[] = {
 431        [0x00] = "evt_no_status",       [0x01] = "-reserved-",
 432        [0x02] = "evt_long_packet",     [0x03] = "evt_missing_ack",
 433        [0x04] = "evt_underrun",        [0x05] = "evt_overrun",
 434        [0x06] = "evt_descriptor_read", [0x07] = "evt_data_read",
 435        [0x08] = "evt_data_write",      [0x09] = "evt_bus_reset",
 436        [0x0a] = "evt_timeout",         [0x0b] = "evt_tcode_err",
 437        [0x0c] = "-reserved-",          [0x0d] = "-reserved-",
 438        [0x0e] = "evt_unknown",         [0x0f] = "evt_flushed",
 439        [0x10] = "-reserved-",          [0x11] = "ack_complete",
 440        [0x12] = "ack_pending ",        [0x13] = "-reserved-",
 441        [0x14] = "ack_busy_X",          [0x15] = "ack_busy_A",
 442        [0x16] = "ack_busy_B",          [0x17] = "-reserved-",
 443        [0x18] = "-reserved-",          [0x19] = "-reserved-",
 444        [0x1a] = "-reserved-",          [0x1b] = "ack_tardy",
 445        [0x1c] = "-reserved-",          [0x1d] = "ack_data_error",
 446        [0x1e] = "ack_type_error",      [0x1f] = "-reserved-",
 447        [0x20] = "pending/cancelled",
 448};
 449static const char *tcodes[] = {
 450        [0x0] = "QW req",               [0x1] = "BW req",
 451        [0x2] = "W resp",               [0x3] = "-reserved-",
 452        [0x4] = "QR req",               [0x5] = "BR req",
 453        [0x6] = "QR resp",              [0x7] = "BR resp",
 454        [0x8] = "cycle start",          [0x9] = "Lk req",
 455        [0xa] = "async stream packet",  [0xb] = "Lk resp",
 456        [0xc] = "-reserved-",           [0xd] = "-reserved-",
 457        [0xe] = "link internal",        [0xf] = "-reserved-",
 458};
 459
 460static void log_ar_at_event(struct fw_ohci *ohci,
 461                            char dir, int speed, u32 *header, int evt)
 462{
 463        int tcode = header[0] >> 4 & 0xf;
 464        char specific[12];
 465
 466        if (likely(!(param_debug & OHCI_PARAM_DEBUG_AT_AR)))
 467                return;
 468
 469        if (unlikely(evt >= ARRAY_SIZE(evts)))
 470                        evt = 0x1f;
 471
 472        if (evt == OHCI1394_evt_bus_reset) {
 473                dev_notice(ohci->card.device,
 474                           "A%c evt_bus_reset, generation %d\n",
 475                           dir, (header[2] >> 16) & 0xff);
 476                return;
 477        }
 478
 479        switch (tcode) {
 480        case 0x0: case 0x6: case 0x8:
 481                snprintf(specific, sizeof(specific), " = %08x",
 482                         be32_to_cpu((__force __be32)header[3]));
 483                break;
 484        case 0x1: case 0x5: case 0x7: case 0x9: case 0xb:
 485                snprintf(specific, sizeof(specific), " %x,%x",
 486                         header[3] >> 16, header[3] & 0xffff);
 487                break;
 488        default:
 489                specific[0] = '\0';
 490        }
 491
 492        switch (tcode) {
 493        case 0xa:
 494                dev_notice(ohci->card.device,
 495                           "A%c %s, %s\n",
 496                           dir, evts[evt], tcodes[tcode]);
 497                break;
 498        case 0xe:
 499                dev_notice(ohci->card.device,
 500                           "A%c %s, PHY %08x %08x\n",
 501                           dir, evts[evt], header[1], header[2]);
 502                break;
 503        case 0x0: case 0x1: case 0x4: case 0x5: case 0x9:
 504                dev_notice(ohci->card.device,
 505                           "A%c spd %x tl %02x, "
 506                           "%04x -> %04x, %s, "
 507                           "%s, %04x%08x%s\n",
 508                           dir, speed, header[0] >> 10 & 0x3f,
 509                           header[1] >> 16, header[0] >> 16, evts[evt],
 510                           tcodes[tcode], header[1] & 0xffff, header[2], specific);
 511                break;
 512        default:
 513                dev_notice(ohci->card.device,
 514                           "A%c spd %x tl %02x, "
 515                           "%04x -> %04x, %s, "
 516                           "%s%s\n",
 517                           dir, speed, header[0] >> 10 & 0x3f,
 518                           header[1] >> 16, header[0] >> 16, evts[evt],
 519                           tcodes[tcode], specific);
 520        }
 521}
 522
 523static inline void reg_write(const struct fw_ohci *ohci, int offset, u32 data)
 524{
 525        writel(data, ohci->registers + offset);
 526}
 527
 528static inline u32 reg_read(const struct fw_ohci *ohci, int offset)
 529{
 530        return readl(ohci->registers + offset);
 531}
 532
 533static inline void flush_writes(const struct fw_ohci *ohci)
 534{
 535        /* Do a dummy read to flush writes. */
 536        reg_read(ohci, OHCI1394_Version);
 537}
 538
 539/*
 540 * Beware!  read_phy_reg(), write_phy_reg(), update_phy_reg(), and
 541 * read_paged_phy_reg() require the caller to hold ohci->phy_reg_mutex.
 542 * In other words, only use ohci_read_phy_reg() and ohci_update_phy_reg()
 543 * directly.  Exceptions are intrinsically serialized contexts like pci_probe.
 544 */
 545static int read_phy_reg(struct fw_ohci *ohci, int addr)
 546{
 547        u32 val;
 548        int i;
 549
 550        reg_write(ohci, OHCI1394_PhyControl, OHCI1394_PhyControl_Read(addr));
 551        for (i = 0; i < 3 + 100; i++) {
 552                val = reg_read(ohci, OHCI1394_PhyControl);
 553                if (!~val)
 554                        return -ENODEV; /* Card was ejected. */
 555
 556                if (val & OHCI1394_PhyControl_ReadDone)
 557                        return OHCI1394_PhyControl_ReadData(val);
 558
 559                /*
 560                 * Try a few times without waiting.  Sleeping is necessary
 561                 * only when the link/PHY interface is busy.
 562                 */
 563                if (i >= 3)
 564                        msleep(1);
 565        }
 566        dev_err(ohci->card.device, "failed to read phy reg\n");
 567
 568        return -EBUSY;
 569}
 570
 571static int write_phy_reg(const struct fw_ohci *ohci, int addr, u32 val)
 572{
 573        int i;
 574
 575        reg_write(ohci, OHCI1394_PhyControl,
 576                  OHCI1394_PhyControl_Write(addr, val));
 577        for (i = 0; i < 3 + 100; i++) {
 578                val = reg_read(ohci, OHCI1394_PhyControl);
 579                if (!~val)
 580                        return -ENODEV; /* Card was ejected. */
 581
 582                if (!(val & OHCI1394_PhyControl_WritePending))
 583                        return 0;
 584
 585                if (i >= 3)
 586                        msleep(1);
 587        }
 588        dev_err(ohci->card.device, "failed to write phy reg\n");
 589
 590        return -EBUSY;
 591}
 592
 593static int update_phy_reg(struct fw_ohci *ohci, int addr,
 594                          int clear_bits, int set_bits)
 595{
 596        int ret = read_phy_reg(ohci, addr);
 597        if (ret < 0)
 598                return ret;
 599
 600        /*
 601         * The interrupt status bits are cleared by writing a one bit.
 602         * Avoid clearing them unless explicitly requested in set_bits.
 603         */
 604        if (addr == 5)
 605                clear_bits |= PHY_INT_STATUS_BITS;
 606
 607        return write_phy_reg(ohci, addr, (ret & ~clear_bits) | set_bits);
 608}
 609
 610static int read_paged_phy_reg(struct fw_ohci *ohci, int page, int addr)
 611{
 612        int ret;
 613
 614        ret = update_phy_reg(ohci, 7, PHY_PAGE_SELECT, page << 5);
 615        if (ret < 0)
 616                return ret;
 617
 618        return read_phy_reg(ohci, addr);
 619}
 620
 621static int ohci_read_phy_reg(struct fw_card *card, int addr)
 622{
 623        struct fw_ohci *ohci = fw_ohci(card);
 624        int ret;
 625
 626        mutex_lock(&ohci->phy_reg_mutex);
 627        ret = read_phy_reg(ohci, addr);
 628        mutex_unlock(&ohci->phy_reg_mutex);
 629
 630        return ret;
 631}
 632
 633static int ohci_update_phy_reg(struct fw_card *card, int addr,
 634                               int clear_bits, int set_bits)
 635{
 636        struct fw_ohci *ohci = fw_ohci(card);
 637        int ret;
 638
 639        mutex_lock(&ohci->phy_reg_mutex);
 640        ret = update_phy_reg(ohci, addr, clear_bits, set_bits);
 641        mutex_unlock(&ohci->phy_reg_mutex);
 642
 643        return ret;
 644}
 645
 646static inline dma_addr_t ar_buffer_bus(struct ar_context *ctx, unsigned int i)
 647{
 648        return page_private(ctx->pages[i]);
 649}
 650
 651static void ar_context_link_page(struct ar_context *ctx, unsigned int index)
 652{
 653        struct descriptor *d;
 654
 655        d = &ctx->descriptors[index];
 656        d->branch_address  &= cpu_to_le32(~0xf);
 657        d->res_count       =  cpu_to_le16(PAGE_SIZE);
 658        d->transfer_status =  0;
 659
 660        wmb(); /* finish init of new descriptors before branch_address update */
 661        d = &ctx->descriptors[ctx->last_buffer_index];
 662        d->branch_address  |= cpu_to_le32(1);
 663
 664        ctx->last_buffer_index = index;
 665
 666        reg_write(ctx->ohci, CONTROL_SET(ctx->regs), CONTEXT_WAKE);
 667}
 668
 669static void ar_context_release(struct ar_context *ctx)
 670{
 671        unsigned int i;
 672
 673        if (ctx->buffer)
 674                vm_unmap_ram(ctx->buffer, AR_BUFFERS + AR_WRAPAROUND_PAGES);
 675
 676        for (i = 0; i < AR_BUFFERS; i++)
 677                if (ctx->pages[i]) {
 678                        dma_unmap_page(ctx->ohci->card.device,
 679                                       ar_buffer_bus(ctx, i),
 680                                       PAGE_SIZE, DMA_FROM_DEVICE);
 681                        __free_page(ctx->pages[i]);
 682                }
 683}
 684
 685static void ar_context_abort(struct ar_context *ctx, const char *error_msg)
 686{
 687        struct fw_ohci *ohci = ctx->ohci;
 688
 689        if (reg_read(ohci, CONTROL_CLEAR(ctx->regs)) & CONTEXT_RUN) {
 690                reg_write(ohci, CONTROL_CLEAR(ctx->regs), CONTEXT_RUN);
 691                flush_writes(ohci);
 692
 693                dev_err(ohci->card.device, "AR error: %s; DMA stopped\n",
 694                        error_msg);
 695        }
 696        /* FIXME: restart? */
 697}
 698
 699static inline unsigned int ar_next_buffer_index(unsigned int index)
 700{
 701        return (index + 1) % AR_BUFFERS;
 702}
 703
 704static inline unsigned int ar_prev_buffer_index(unsigned int index)
 705{
 706        return (index - 1 + AR_BUFFERS) % AR_BUFFERS;
 707}
 708
 709static inline unsigned int ar_first_buffer_index(struct ar_context *ctx)
 710{
 711        return ar_next_buffer_index(ctx->last_buffer_index);
 712}
 713
 714/*
 715 * We search for the buffer that contains the last AR packet DMA data written
 716 * by the controller.
 717 */
 718static unsigned int ar_search_last_active_buffer(struct ar_context *ctx,
 719                                                 unsigned int *buffer_offset)
 720{
 721        unsigned int i, next_i, last = ctx->last_buffer_index;
 722        __le16 res_count, next_res_count;
 723
 724        i = ar_first_buffer_index(ctx);
 725        res_count = ACCESS_ONCE(ctx->descriptors[i].res_count);
 726
 727        /* A buffer that is not yet completely filled must be the last one. */
 728        while (i != last && res_count == 0) {
 729
 730                /* Peek at the next descriptor. */
 731                next_i = ar_next_buffer_index(i);
 732                rmb(); /* read descriptors in order */
 733                next_res_count = ACCESS_ONCE(
 734                                ctx->descriptors[next_i].res_count);
 735                /*
 736                 * If the next descriptor is still empty, we must stop at this
 737                 * descriptor.
 738                 */
 739                if (next_res_count == cpu_to_le16(PAGE_SIZE)) {
 740                        /*
 741                         * The exception is when the DMA data for one packet is
 742                         * split over three buffers; in this case, the middle
 743                         * buffer's descriptor might be never updated by the
 744                         * controller and look still empty, and we have to peek
 745                         * at the third one.
 746                         */
 747                        if (MAX_AR_PACKET_SIZE > PAGE_SIZE && i != last) {
 748                                next_i = ar_next_buffer_index(next_i);
 749                                rmb();
 750                                next_res_count = ACCESS_ONCE(
 751                                        ctx->descriptors[next_i].res_count);
 752                                if (next_res_count != cpu_to_le16(PAGE_SIZE))
 753                                        goto next_buffer_is_active;
 754                        }
 755
 756                        break;
 757                }
 758
 759next_buffer_is_active:
 760                i = next_i;
 761                res_count = next_res_count;
 762        }
 763
 764        rmb(); /* read res_count before the DMA data */
 765
 766        *buffer_offset = PAGE_SIZE - le16_to_cpu(res_count);
 767        if (*buffer_offset > PAGE_SIZE) {
 768                *buffer_offset = 0;
 769                ar_context_abort(ctx, "corrupted descriptor");
 770        }
 771
 772        return i;
 773}
 774
 775static void ar_sync_buffers_for_cpu(struct ar_context *ctx,
 776                                    unsigned int end_buffer_index,
 777                                    unsigned int end_buffer_offset)
 778{
 779        unsigned int i;
 780
 781        i = ar_first_buffer_index(ctx);
 782        while (i != end_buffer_index) {
 783                dma_sync_single_for_cpu(ctx->ohci->card.device,
 784                                        ar_buffer_bus(ctx, i),
 785                                        PAGE_SIZE, DMA_FROM_DEVICE);
 786                i = ar_next_buffer_index(i);
 787        }
 788        if (end_buffer_offset > 0)
 789                dma_sync_single_for_cpu(ctx->ohci->card.device,
 790                                        ar_buffer_bus(ctx, i),
 791                                        end_buffer_offset, DMA_FROM_DEVICE);
 792}
 793
 794#if defined(CONFIG_PPC_PMAC) && defined(CONFIG_PPC32)
 795#define cond_le32_to_cpu(v) \
 796        (ohci->quirks & QUIRK_BE_HEADERS ? (__force __u32)(v) : le32_to_cpu(v))
 797#else
 798#define cond_le32_to_cpu(v) le32_to_cpu(v)
 799#endif
 800
 801static __le32 *handle_ar_packet(struct ar_context *ctx, __le32 *buffer)
 802{
 803        struct fw_ohci *ohci = ctx->ohci;
 804        struct fw_packet p;
 805        u32 status, length, tcode;
 806        int evt;
 807
 808        p.header[0] = cond_le32_to_cpu(buffer[0]);
 809        p.header[1] = cond_le32_to_cpu(buffer[1]);
 810        p.header[2] = cond_le32_to_cpu(buffer[2]);
 811
 812        tcode = (p.header[0] >> 4) & 0x0f;
 813        switch (tcode) {
 814        case TCODE_WRITE_QUADLET_REQUEST:
 815        case TCODE_READ_QUADLET_RESPONSE:
 816                p.header[3] = (__force __u32) buffer[3];
 817                p.header_length = 16;
 818                p.payload_length = 0;
 819                break;
 820
 821        case TCODE_READ_BLOCK_REQUEST :
 822                p.header[3] = cond_le32_to_cpu(buffer[3]);
 823                p.header_length = 16;
 824                p.payload_length = 0;
 825                break;
 826
 827        case TCODE_WRITE_BLOCK_REQUEST:
 828        case TCODE_READ_BLOCK_RESPONSE:
 829        case TCODE_LOCK_REQUEST:
 830        case TCODE_LOCK_RESPONSE:
 831                p.header[3] = cond_le32_to_cpu(buffer[3]);
 832                p.header_length = 16;
 833                p.payload_length = p.header[3] >> 16;
 834                if (p.payload_length > MAX_ASYNC_PAYLOAD) {
 835                        ar_context_abort(ctx, "invalid packet length");
 836                        return NULL;
 837                }
 838                break;
 839
 840        case TCODE_WRITE_RESPONSE:
 841        case TCODE_READ_QUADLET_REQUEST:
 842        case OHCI_TCODE_PHY_PACKET:
 843                p.header_length = 12;
 844                p.payload_length = 0;
 845                break;
 846
 847        default:
 848                ar_context_abort(ctx, "invalid tcode");
 849                return NULL;
 850        }
 851
 852        p.payload = (void *) buffer + p.header_length;
 853
 854        /* FIXME: What to do about evt_* errors? */
 855        length = (p.header_length + p.payload_length + 3) / 4;
 856        status = cond_le32_to_cpu(buffer[length]);
 857        evt    = (status >> 16) & 0x1f;
 858
 859        p.ack        = evt - 16;
 860        p.speed      = (status >> 21) & 0x7;
 861        p.timestamp  = status & 0xffff;
 862        p.generation = ohci->request_generation;
 863
 864        log_ar_at_event(ohci, 'R', p.speed, p.header, evt);
 865
 866        /*
 867         * Several controllers, notably from NEC and VIA, forget to
 868         * write ack_complete status at PHY packet reception.
 869         */
 870        if (evt == OHCI1394_evt_no_status &&
 871            (p.header[0] & 0xff) == (OHCI1394_phy_tcode << 4))
 872                p.ack = ACK_COMPLETE;
 873
 874        /*
 875         * The OHCI bus reset handler synthesizes a PHY packet with
 876         * the new generation number when a bus reset happens (see
 877         * section 8.4.2.3).  This helps us determine when a request
 878         * was received and make sure we send the response in the same
 879         * generation.  We only need this for requests; for responses
 880         * we use the unique tlabel for finding the matching
 881         * request.
 882         *
 883         * Alas some chips sometimes emit bus reset packets with a
 884         * wrong generation.  We set the correct generation for these
 885         * at a slightly incorrect time (in bus_reset_work).
 886         */
 887        if (evt == OHCI1394_evt_bus_reset) {
 888                if (!(ohci->quirks & QUIRK_RESET_PACKET))
 889                        ohci->request_generation = (p.header[2] >> 16) & 0xff;
 890        } else if (ctx == &ohci->ar_request_ctx) {
 891                fw_core_handle_request(&ohci->card, &p);
 892        } else {
 893                fw_core_handle_response(&ohci->card, &p);
 894        }
 895
 896        return buffer + length + 1;
 897}
 898
 899static void *handle_ar_packets(struct ar_context *ctx, void *p, void *end)
 900{
 901        void *next;
 902
 903        while (p < end) {
 904                next = handle_ar_packet(ctx, p);
 905                if (!next)
 906                        return p;
 907                p = next;
 908        }
 909
 910        return p;
 911}
 912
 913static void ar_recycle_buffers(struct ar_context *ctx, unsigned int end_buffer)
 914{
 915        unsigned int i;
 916
 917        i = ar_first_buffer_index(ctx);
 918        while (i != end_buffer) {
 919                dma_sync_single_for_device(ctx->ohci->card.device,
 920                                           ar_buffer_bus(ctx, i),
 921                                           PAGE_SIZE, DMA_FROM_DEVICE);
 922                ar_context_link_page(ctx, i);
 923                i = ar_next_buffer_index(i);
 924        }
 925}
 926
 927static void ar_context_tasklet(unsigned long data)
 928{
 929        struct ar_context *ctx = (struct ar_context *)data;
 930        unsigned int end_buffer_index, end_buffer_offset;
 931        void *p, *end;
 932
 933        p = ctx->pointer;
 934        if (!p)
 935                return;
 936
 937        end_buffer_index = ar_search_last_active_buffer(ctx,
 938                                                        &end_buffer_offset);
 939        ar_sync_buffers_for_cpu(ctx, end_buffer_index, end_buffer_offset);
 940        end = ctx->buffer + end_buffer_index * PAGE_SIZE + end_buffer_offset;
 941
 942        if (end_buffer_index < ar_first_buffer_index(ctx)) {
 943                /*
 944                 * The filled part of the overall buffer wraps around; handle
 945                 * all packets up to the buffer end here.  If the last packet
 946                 * wraps around, its tail will be visible after the buffer end
 947                 * because the buffer start pages are mapped there again.
 948                 */
 949                void *buffer_end = ctx->buffer + AR_BUFFERS * PAGE_SIZE;
 950                p = handle_ar_packets(ctx, p, buffer_end);
 951                if (p < buffer_end)
 952                        goto error;
 953                /* adjust p to point back into the actual buffer */
 954                p -= AR_BUFFERS * PAGE_SIZE;
 955        }
 956
 957        p = handle_ar_packets(ctx, p, end);
 958        if (p != end) {
 959                if (p > end)
 960                        ar_context_abort(ctx, "inconsistent descriptor");
 961                goto error;
 962        }
 963
 964        ctx->pointer = p;
 965        ar_recycle_buffers(ctx, end_buffer_index);
 966
 967        return;
 968
 969error:
 970        ctx->pointer = NULL;
 971}
 972
 973static int ar_context_init(struct ar_context *ctx, struct fw_ohci *ohci,
 974                           unsigned int descriptors_offset, u32 regs)
 975{
 976        unsigned int i;
 977        dma_addr_t dma_addr;
 978        struct page *pages[AR_BUFFERS + AR_WRAPAROUND_PAGES];
 979        struct descriptor *d;
 980
 981        ctx->regs        = regs;
 982        ctx->ohci        = ohci;
 983        tasklet_init(&ctx->tasklet, ar_context_tasklet, (unsigned long)ctx);
 984
 985        for (i = 0; i < AR_BUFFERS; i++) {
 986                ctx->pages[i] = alloc_page(GFP_KERNEL | GFP_DMA32);
 987                if (!ctx->pages[i])
 988                        goto out_of_memory;
 989                dma_addr = dma_map_page(ohci->card.device, ctx->pages[i],
 990                                        0, PAGE_SIZE, DMA_FROM_DEVICE);
 991                if (dma_mapping_error(ohci->card.device, dma_addr)) {
 992                        __free_page(ctx->pages[i]);
 993                        ctx->pages[i] = NULL;
 994                        goto out_of_memory;
 995                }
 996                set_page_private(ctx->pages[i], dma_addr);
 997        }
 998
 999        for (i = 0; i < AR_BUFFERS; i++)
1000                pages[i]              = ctx->pages[i];
1001        for (i = 0; i < AR_WRAPAROUND_PAGES; i++)
1002                pages[AR_BUFFERS + i] = ctx->pages[i];
1003        ctx->buffer = vm_map_ram(pages, AR_BUFFERS + AR_WRAPAROUND_PAGES,
1004                                 -1, PAGE_KERNEL);
1005        if (!ctx->buffer)
1006                goto out_of_memory;
1007
1008        ctx->descriptors     = ohci->misc_buffer     + descriptors_offset;
1009        ctx->descriptors_bus = ohci->misc_buffer_bus + descriptors_offset;
1010
1011        for (i = 0; i < AR_BUFFERS; i++) {
1012                d = &ctx->descriptors[i];
1013                d->req_count      = cpu_to_le16(PAGE_SIZE);
1014                d->control        = cpu_to_le16(DESCRIPTOR_INPUT_MORE |
1015                                                DESCRIPTOR_STATUS |
1016                                                DESCRIPTOR_BRANCH_ALWAYS);
1017                d->data_address   = cpu_to_le32(ar_buffer_bus(ctx, i));
1018                d->branch_address = cpu_to_le32(ctx->descriptors_bus +
1019                        ar_next_buffer_index(i) * sizeof(struct descriptor));
1020        }
1021
1022        return 0;
1023
1024out_of_memory:
1025        ar_context_release(ctx);
1026
1027        return -ENOMEM;
1028}
1029
1030static void ar_context_run(struct ar_context *ctx)
1031{
1032        unsigned int i;
1033
1034        for (i = 0; i < AR_BUFFERS; i++)
1035                ar_context_link_page(ctx, i);
1036
1037        ctx->pointer = ctx->buffer;
1038
1039        reg_write(ctx->ohci, COMMAND_PTR(ctx->regs), ctx->descriptors_bus | 1);
1040        reg_write(ctx->ohci, CONTROL_SET(ctx->regs), CONTEXT_RUN);
1041}
1042
1043static struct descriptor *find_branch_descriptor(struct descriptor *d, int z)
1044{
1045        __le16 branch;
1046
1047        branch = d->control & cpu_to_le16(DESCRIPTOR_BRANCH_ALWAYS);
1048
1049        /* figure out which descriptor the branch address goes in */
1050        if (z == 2 && branch == cpu_to_le16(DESCRIPTOR_BRANCH_ALWAYS))
1051                return d;
1052        else
1053                return d + z - 1;
1054}
1055
1056static void context_tasklet(unsigned long data)
1057{
1058        struct context *ctx = (struct context *) data;
1059        struct descriptor *d, *last;
1060        u32 address;
1061        int z;
1062        struct descriptor_buffer *desc;
1063
1064        desc = list_entry(ctx->buffer_list.next,
1065                        struct descriptor_buffer, list);
1066        last = ctx->last;
1067        while (last->branch_address != 0) {
1068                struct descriptor_buffer *old_desc = desc;
1069                address = le32_to_cpu(last->branch_address);
1070                z = address & 0xf;
1071                address &= ~0xf;
1072                ctx->current_bus = address;
1073
1074                /* If the branch address points to a buffer outside of the
1075                 * current buffer, advance to the next buffer. */
1076                if (address < desc->buffer_bus ||
1077                                address >= desc->buffer_bus + desc->used)
1078                        desc = list_entry(desc->list.next,
1079                                        struct descriptor_buffer, list);
1080                d = desc->buffer + (address - desc->buffer_bus) / sizeof(*d);
1081                last = find_branch_descriptor(d, z);
1082
1083                if (!ctx->callback(ctx, d, last))
1084                        break;
1085
1086                if (old_desc != desc) {
1087                        /* If we've advanced to the next buffer, move the
1088                         * previous buffer to the free list. */
1089                        unsigned long flags;
1090                        old_desc->used = 0;
1091                        spin_lock_irqsave(&ctx->ohci->lock, flags);
1092                        list_move_tail(&old_desc->list, &ctx->buffer_list);
1093                        spin_unlock_irqrestore(&ctx->ohci->lock, flags);
1094                }
1095                ctx->last = last;
1096        }
1097}
1098
1099/*
1100 * Allocate a new buffer and add it to the list of free buffers for this
1101 * context.  Must be called with ohci->lock held.
1102 */
1103static int context_add_buffer(struct context *ctx)
1104{
1105        struct descriptor_buffer *desc;
1106        dma_addr_t uninitialized_var(bus_addr);
1107        int offset;
1108
1109        /*
1110         * 16MB of descriptors should be far more than enough for any DMA
1111         * program.  This will catch run-away userspace or DoS attacks.
1112         */
1113        if (ctx->total_allocation >= 16*1024*1024)
1114                return -ENOMEM;
1115
1116        desc = dma_alloc_coherent(ctx->ohci->card.device, PAGE_SIZE,
1117                        &bus_addr, GFP_ATOMIC);
1118        if (!desc)
1119                return -ENOMEM;
1120
1121        offset = (void *)&desc->buffer - (void *)desc;
1122        desc->buffer_size = PAGE_SIZE - offset;
1123        desc->buffer_bus = bus_addr + offset;
1124        desc->used = 0;
1125
1126        list_add_tail(&desc->list, &ctx->buffer_list);
1127        ctx->total_allocation += PAGE_SIZE;
1128
1129        return 0;
1130}
1131
1132static int context_init(struct context *ctx, struct fw_ohci *ohci,
1133                        u32 regs, descriptor_callback_t callback)
1134{
1135        ctx->ohci = ohci;
1136        ctx->regs = regs;
1137        ctx->total_allocation = 0;
1138
1139        INIT_LIST_HEAD(&ctx->buffer_list);
1140        if (context_add_buffer(ctx) < 0)
1141                return -ENOMEM;
1142
1143        ctx->buffer_tail = list_entry(ctx->buffer_list.next,
1144                        struct descriptor_buffer, list);
1145
1146        tasklet_init(&ctx->tasklet, context_tasklet, (unsigned long)ctx);
1147        ctx->callback = callback;
1148
1149        /*
1150         * We put a dummy descriptor in the buffer that has a NULL
1151         * branch address and looks like it's been sent.  That way we
1152         * have a descriptor to append DMA programs to.
1153         */
1154        memset(ctx->buffer_tail->buffer, 0, sizeof(*ctx->buffer_tail->buffer));
1155        ctx->buffer_tail->buffer->control = cpu_to_le16(DESCRIPTOR_OUTPUT_LAST);
1156        ctx->buffer_tail->buffer->transfer_status = cpu_to_le16(0x8011);
1157        ctx->buffer_tail->used += sizeof(*ctx->buffer_tail->buffer);
1158        ctx->last = ctx->buffer_tail->buffer;
1159        ctx->prev = ctx->buffer_tail->buffer;
1160
1161        return 0;
1162}
1163
1164static void context_release(struct context *ctx)
1165{
1166        struct fw_card *card = &ctx->ohci->card;
1167        struct descriptor_buffer *desc, *tmp;
1168
1169        list_for_each_entry_safe(desc, tmp, &ctx->buffer_list, list)
1170                dma_free_coherent(card->device, PAGE_SIZE, desc,
1171                        desc->buffer_bus -
1172                        ((void *)&desc->buffer - (void *)desc));
1173}
1174
1175/* Must be called with ohci->lock held */
1176static struct descriptor *context_get_descriptors(struct context *ctx,
1177                                                  int z, dma_addr_t *d_bus)
1178{
1179        struct descriptor *d = NULL;
1180        struct descriptor_buffer *desc = ctx->buffer_tail;
1181
1182        if (z * sizeof(*d) > desc->buffer_size)
1183                return NULL;
1184
1185        if (z * sizeof(*d) > desc->buffer_size - desc->used) {
1186                /* No room for the descriptor in this buffer, so advance to the
1187                 * next one. */
1188
1189                if (desc->list.next == &ctx->buffer_list) {
1190                        /* If there is no free buffer next in the list,
1191                         * allocate one. */
1192                        if (context_add_buffer(ctx) < 0)
1193                                return NULL;
1194                }
1195                desc = list_entry(desc->list.next,
1196                                struct descriptor_buffer, list);
1197                ctx->buffer_tail = desc;
1198        }
1199
1200        d = desc->buffer + desc->used / sizeof(*d);
1201        memset(d, 0, z * sizeof(*d));
1202        *d_bus = desc->buffer_bus + desc->used;
1203
1204        return d;
1205}
1206
1207static void context_run(struct context *ctx, u32 extra)
1208{
1209        struct fw_ohci *ohci = ctx->ohci;
1210
1211        reg_write(ohci, COMMAND_PTR(ctx->regs),
1212                  le32_to_cpu(ctx->last->branch_address));
1213        reg_write(ohci, CONTROL_CLEAR(ctx->regs), ~0);
1214        reg_write(ohci, CONTROL_SET(ctx->regs), CONTEXT_RUN | extra);
1215        ctx->running = true;
1216        flush_writes(ohci);
1217}
1218
1219static void context_append(struct context *ctx,
1220                           struct descriptor *d, int z, int extra)
1221{
1222        dma_addr_t d_bus;
1223        struct descriptor_buffer *desc = ctx->buffer_tail;
1224
1225        d_bus = desc->buffer_bus + (d - desc->buffer) * sizeof(*d);
1226
1227        desc->used += (z + extra) * sizeof(*d);
1228
1229        wmb(); /* finish init of new descriptors before branch_address update */
1230        ctx->prev->branch_address = cpu_to_le32(d_bus | z);
1231        ctx->prev = find_branch_descriptor(d, z);
1232}
1233
1234static void context_stop(struct context *ctx)
1235{
1236        struct fw_ohci *ohci = ctx->ohci;
1237        u32 reg;
1238        int i;
1239
1240        reg_write(ohci, CONTROL_CLEAR(ctx->regs), CONTEXT_RUN);
1241        ctx->running = false;
1242
1243        for (i = 0; i < 1000; i++) {
1244                reg = reg_read(ohci, CONTROL_SET(ctx->regs));
1245                if ((reg & CONTEXT_ACTIVE) == 0)
1246                        return;
1247
1248                if (i)
1249                        udelay(10);
1250        }
1251        dev_err(ohci->card.device, "DMA context still active (0x%08x)\n", reg);
1252}
1253
1254struct driver_data {
1255        u8 inline_data[8];
1256        struct fw_packet *packet;
1257};
1258
1259/*
1260 * This function apppends a packet to the DMA queue for transmission.
1261 * Must always be called with the ochi->lock held to ensure proper
1262 * generation handling and locking around packet queue manipulation.
1263 */
1264static int at_context_queue_packet(struct context *ctx,
1265                                   struct fw_packet *packet)
1266{
1267        struct fw_ohci *ohci = ctx->ohci;
1268        dma_addr_t d_bus, uninitialized_var(payload_bus);
1269        struct driver_data *driver_data;
1270        struct descriptor *d, *last;
1271        __le32 *header;
1272        int z, tcode;
1273
1274        d = context_get_descriptors(ctx, 4, &d_bus);
1275        if (d == NULL) {
1276                packet->ack = RCODE_SEND_ERROR;
1277                return -1;
1278        }
1279
1280        d[0].control   = cpu_to_le16(DESCRIPTOR_KEY_IMMEDIATE);
1281        d[0].res_count = cpu_to_le16(packet->timestamp);
1282
1283        /*
1284         * The DMA format for asyncronous link packets is different
1285         * from the IEEE1394 layout, so shift the fields around
1286         * accordingly.
1287         */
1288
1289        tcode = (packet->header[0] >> 4) & 0x0f;
1290        header = (__le32 *) &d[1];
1291        switch (tcode) {
1292        case TCODE_WRITE_QUADLET_REQUEST:
1293        case TCODE_WRITE_BLOCK_REQUEST:
1294        case TCODE_WRITE_RESPONSE:
1295        case TCODE_READ_QUADLET_REQUEST:
1296        case TCODE_READ_BLOCK_REQUEST:
1297        case TCODE_READ_QUADLET_RESPONSE:
1298        case TCODE_READ_BLOCK_RESPONSE:
1299        case TCODE_LOCK_REQUEST:
1300        case TCODE_LOCK_RESPONSE:
1301                header[0] = cpu_to_le32((packet->header[0] & 0xffff) |
1302                                        (packet->speed << 16));
1303                header[1] = cpu_to_le32((packet->header[1] & 0xffff) |
1304                                        (packet->header[0] & 0xffff0000));
1305                header[2] = cpu_to_le32(packet->header[2]);
1306
1307                if (TCODE_IS_BLOCK_PACKET(tcode))
1308                        header[3] = cpu_to_le32(packet->header[3]);
1309                else
1310                        header[3] = (__force __le32) packet->header[3];
1311
1312                d[0].req_count = cpu_to_le16(packet->header_length);
1313                break;
1314
1315        case TCODE_LINK_INTERNAL:
1316                header[0] = cpu_to_le32((OHCI1394_phy_tcode << 4) |
1317                                        (packet->speed << 16));
1318                header[1] = cpu_to_le32(packet->header[1]);
1319                header[2] = cpu_to_le32(packet->header[2]);
1320                d[0].req_count = cpu_to_le16(12);
1321
1322                if (is_ping_packet(&packet->header[1]))
1323                        d[0].control |= cpu_to_le16(DESCRIPTOR_PING);
1324                break;
1325
1326        case TCODE_STREAM_DATA:
1327                header[0] = cpu_to_le32((packet->header[0] & 0xffff) |
1328                                        (packet->speed << 16));
1329                header[1] = cpu_to_le32(packet->header[0] & 0xffff0000);
1330                d[0].req_count = cpu_to_le16(8);
1331                break;
1332
1333        default:
1334                /* BUG(); */
1335                packet->ack = RCODE_SEND_ERROR;
1336                return -1;
1337        }
1338
1339        BUILD_BUG_ON(sizeof(struct driver_data) > sizeof(struct descriptor));
1340        driver_data = (struct driver_data *) &d[3];
1341        driver_data->packet = packet;
1342        packet->driver_data = driver_data;
1343
1344        if (packet->payload_length > 0) {
1345                if (packet->payload_length > sizeof(driver_data->inline_data)) {
1346                        payload_bus = dma_map_single(ohci->card.device,
1347                                                     packet->payload,
1348                                                     packet->payload_length,
1349                                                     DMA_TO_DEVICE);
1350                        if (dma_mapping_error(ohci->card.device, payload_bus)) {
1351                                packet->ack = RCODE_SEND_ERROR;
1352                                return -1;
1353                        }
1354                        packet->payload_bus     = payload_bus;
1355                        packet->payload_mapped  = true;
1356                } else {
1357                        memcpy(driver_data->inline_data, packet->payload,
1358                               packet->payload_length);
1359                        payload_bus = d_bus + 3 * sizeof(*d);
1360                }
1361
1362                d[2].req_count    = cpu_to_le16(packet->payload_length);
1363                d[2].data_address = cpu_to_le32(payload_bus);
1364                last = &d[2];
1365                z = 3;
1366        } else {
1367                last = &d[0];
1368                z = 2;
1369        }
1370
1371        last->control |= cpu_to_le16(DESCRIPTOR_OUTPUT_LAST |
1372                                     DESCRIPTOR_IRQ_ALWAYS |
1373                                     DESCRIPTOR_BRANCH_ALWAYS);
1374
1375        /* FIXME: Document how the locking works. */
1376        if (ohci->generation != packet->generation) {
1377                if (packet->payload_mapped)
1378                        dma_unmap_single(ohci->card.device, payload_bus,
1379                                         packet->payload_length, DMA_TO_DEVICE);
1380                packet->ack = RCODE_GENERATION;
1381                return -1;
1382        }
1383
1384        context_append(ctx, d, z, 4 - z);
1385
1386        if (ctx->running)
1387                reg_write(ohci, CONTROL_SET(ctx->regs), CONTEXT_WAKE);
1388        else
1389                context_run(ctx, 0);
1390
1391        return 0;
1392}
1393
1394static void at_context_flush(struct context *ctx)
1395{
1396        tasklet_disable(&ctx->tasklet);
1397
1398        ctx->flushing = true;
1399        context_tasklet((unsigned long)ctx);
1400        ctx->flushing = false;
1401
1402        tasklet_enable(&ctx->tasklet);
1403}
1404
1405static int handle_at_packet(struct context *context,
1406                            struct descriptor *d,
1407                            struct descriptor *last)
1408{
1409        struct driver_data *driver_data;
1410        struct fw_packet *packet;
1411        struct fw_ohci *ohci = context->ohci;
1412        int evt;
1413
1414        if (last->transfer_status == 0 && !context->flushing)
1415                /* This descriptor isn't done yet, stop iteration. */
1416                return 0;
1417
1418        driver_data = (struct driver_data *) &d[3];
1419        packet = driver_data->packet;
1420        if (packet == NULL)
1421                /* This packet was cancelled, just continue. */
1422                return 1;
1423
1424        if (packet->payload_mapped)
1425                dma_unmap_single(ohci->card.device, packet->payload_bus,
1426                                 packet->payload_length, DMA_TO_DEVICE);
1427
1428        evt = le16_to_cpu(last->transfer_status) & 0x1f;
1429        packet->timestamp = le16_to_cpu(last->res_count);
1430
1431        log_ar_at_event(ohci, 'T', packet->speed, packet->header, evt);
1432
1433        switch (evt) {
1434        case OHCI1394_evt_timeout:
1435                /* Async response transmit timed out. */
1436                packet->ack = RCODE_CANCELLED;
1437                break;
1438
1439        case OHCI1394_evt_flushed:
1440                /*
1441                 * The packet was flushed should give same error as
1442                 * when we try to use a stale generation count.
1443                 */
1444                packet->ack = RCODE_GENERATION;
1445                break;
1446
1447        case OHCI1394_evt_missing_ack:
1448                if (context->flushing)
1449                        packet->ack = RCODE_GENERATION;
1450                else {
1451                        /*
1452                         * Using a valid (current) generation count, but the
1453                         * node is not on the bus or not sending acks.
1454                         */
1455                        packet->ack = RCODE_NO_ACK;
1456                }
1457                break;
1458
1459        case ACK_COMPLETE + 0x10:
1460        case ACK_PENDING + 0x10:
1461        case ACK_BUSY_X + 0x10:
1462        case ACK_BUSY_A + 0x10:
1463        case ACK_BUSY_B + 0x10:
1464        case ACK_DATA_ERROR + 0x10:
1465        case ACK_TYPE_ERROR + 0x10:
1466                packet->ack = evt - 0x10;
1467                break;
1468
1469        case OHCI1394_evt_no_status:
1470                if (context->flushing) {
1471                        packet->ack = RCODE_GENERATION;
1472                        break;
1473                }
1474                /* fall through */
1475
1476        default:
1477                packet->ack = RCODE_SEND_ERROR;
1478                break;
1479        }
1480
1481        packet->callback(packet, &ohci->card, packet->ack);
1482
1483        return 1;
1484}
1485
1486#define HEADER_GET_DESTINATION(q)       (((q) >> 16) & 0xffff)
1487#define HEADER_GET_TCODE(q)             (((q) >> 4) & 0x0f)
1488#define HEADER_GET_OFFSET_HIGH(q)       (((q) >> 0) & 0xffff)
1489#define HEADER_GET_DATA_LENGTH(q)       (((q) >> 16) & 0xffff)
1490#define HEADER_GET_EXTENDED_TCODE(q)    (((q) >> 0) & 0xffff)
1491
1492static void handle_local_rom(struct fw_ohci *ohci,
1493                             struct fw_packet *packet, u32 csr)
1494{
1495        struct fw_packet response;
1496        int tcode, length, i;
1497
1498        tcode = HEADER_GET_TCODE(packet->header[0]);
1499        if (TCODE_IS_BLOCK_PACKET(tcode))
1500                length = HEADER_GET_DATA_LENGTH(packet->header[3]);
1501        else
1502                length = 4;
1503
1504        i = csr - CSR_CONFIG_ROM;
1505        if (i + length > CONFIG_ROM_SIZE) {
1506                fw_fill_response(&response, packet->header,
1507                                 RCODE_ADDRESS_ERROR, NULL, 0);
1508        } else if (!TCODE_IS_READ_REQUEST(tcode)) {
1509                fw_fill_response(&response, packet->header,
1510                                 RCODE_TYPE_ERROR, NULL, 0);
1511        } else {
1512                fw_fill_response(&response, packet->header, RCODE_COMPLETE,
1513                                 (void *) ohci->config_rom + i, length);
1514        }
1515
1516        fw_core_handle_response(&ohci->card, &response);
1517}
1518
1519static void handle_local_lock(struct fw_ohci *ohci,
1520                              struct fw_packet *packet, u32 csr)
1521{
1522        struct fw_packet response;
1523        int tcode, length, ext_tcode, sel, try;
1524        __be32 *payload, lock_old;
1525        u32 lock_arg, lock_data;
1526
1527        tcode = HEADER_GET_TCODE(packet->header[0]);
1528        length = HEADER_GET_DATA_LENGTH(packet->header[3]);
1529        payload = packet->payload;
1530        ext_tcode = HEADER_GET_EXTENDED_TCODE(packet->header[3]);
1531
1532        if (tcode == TCODE_LOCK_REQUEST &&
1533            ext_tcode == EXTCODE_COMPARE_SWAP && length == 8) {
1534                lock_arg = be32_to_cpu(payload[0]);
1535                lock_data = be32_to_cpu(payload[1]);
1536        } else if (tcode == TCODE_READ_QUADLET_REQUEST) {
1537                lock_arg = 0;
1538                lock_data = 0;
1539        } else {
1540                fw_fill_response(&response, packet->header,
1541                                 RCODE_TYPE_ERROR, NULL, 0);
1542                goto out;
1543        }
1544
1545        sel = (csr - CSR_BUS_MANAGER_ID) / 4;
1546        reg_write(ohci, OHCI1394_CSRData, lock_data);
1547        reg_write(ohci, OHCI1394_CSRCompareData, lock_arg);
1548        reg_write(ohci, OHCI1394_CSRControl, sel);
1549
1550        for (try = 0; try < 20; try++)
1551                if (reg_read(ohci, OHCI1394_CSRControl) & 0x80000000) {
1552                        lock_old = cpu_to_be32(reg_read(ohci,
1553                                                        OHCI1394_CSRData));
1554                        fw_fill_response(&response, packet->header,
1555                                         RCODE_COMPLETE,
1556                                         &lock_old, sizeof(lock_old));
1557                        goto out;
1558                }
1559
1560        dev_err(ohci->card.device, "swap not done (CSR lock timeout)\n");
1561        fw_fill_response(&response, packet->header, RCODE_BUSY, NULL, 0);
1562
1563 out:
1564        fw_core_handle_response(&ohci->card, &response);
1565}
1566
1567static void handle_local_request(struct context *ctx, struct fw_packet *packet)
1568{
1569        u64 offset, csr;
1570
1571        if (ctx == &ctx->ohci->at_request_ctx) {
1572                packet->ack = ACK_PENDING;
1573                packet->callback(packet, &ctx->ohci->card, packet->ack);
1574        }
1575
1576        offset =
1577                ((unsigned long long)
1578                 HEADER_GET_OFFSET_HIGH(packet->header[1]) << 32) |
1579                packet->header[2];
1580        csr = offset - CSR_REGISTER_BASE;
1581
1582        /* Handle config rom reads. */
1583        if (csr >= CSR_CONFIG_ROM && csr < CSR_CONFIG_ROM_END)
1584                handle_local_rom(ctx->ohci, packet, csr);
1585        else switch (csr) {
1586        case CSR_BUS_MANAGER_ID:
1587        case CSR_BANDWIDTH_AVAILABLE:
1588        case CSR_CHANNELS_AVAILABLE_HI:
1589        case CSR_CHANNELS_AVAILABLE_LO:
1590                handle_local_lock(ctx->ohci, packet, csr);
1591                break;
1592        default:
1593                if (ctx == &ctx->ohci->at_request_ctx)
1594                        fw_core_handle_request(&ctx->ohci->card, packet);
1595                else
1596                        fw_core_handle_response(&ctx->ohci->card, packet);
1597                break;
1598        }
1599
1600        if (ctx == &ctx->ohci->at_response_ctx) {
1601                packet->ack = ACK_COMPLETE;
1602                packet->callback(packet, &ctx->ohci->card, packet->ack);
1603        }
1604}
1605
1606static void at_context_transmit(struct context *ctx, struct fw_packet *packet)
1607{
1608        unsigned long flags;
1609        int ret;
1610
1611        spin_lock_irqsave(&ctx->ohci->lock, flags);
1612
1613        if (HEADER_GET_DESTINATION(packet->header[0]) == ctx->ohci->node_id &&
1614            ctx->ohci->generation == packet->generation) {
1615                spin_unlock_irqrestore(&ctx->ohci->lock, flags);
1616                handle_local_request(ctx, packet);
1617                return;
1618        }
1619
1620        ret = at_context_queue_packet(ctx, packet);
1621        spin_unlock_irqrestore(&ctx->ohci->lock, flags);
1622
1623        if (ret < 0)
1624                packet->callback(packet, &ctx->ohci->card, packet->ack);
1625
1626}
1627
1628static void detect_dead_context(struct fw_ohci *ohci,
1629                                const char *name, unsigned int regs)
1630{
1631        u32 ctl;
1632
1633        ctl = reg_read(ohci, CONTROL_SET(regs));
1634        if (ctl & CONTEXT_DEAD)
1635                dev_err(ohci->card.device,
1636                        "DMA context %s has stopped, error code: %s\n",
1637                        name, evts[ctl & 0x1f]);
1638}
1639
1640static void handle_dead_contexts(struct fw_ohci *ohci)
1641{
1642        unsigned int i;
1643        char name[8];
1644
1645        detect_dead_context(ohci, "ATReq", OHCI1394_AsReqTrContextBase);
1646        detect_dead_context(ohci, "ATRsp", OHCI1394_AsRspTrContextBase);
1647        detect_dead_context(ohci, "ARReq", OHCI1394_AsReqRcvContextBase);
1648        detect_dead_context(ohci, "ARRsp", OHCI1394_AsRspRcvContextBase);
1649        for (i = 0; i < 32; ++i) {
1650                if (!(ohci->it_context_support & (1 << i)))
1651                        continue;
1652                sprintf(name, "IT%u", i);
1653                detect_dead_context(ohci, name, OHCI1394_IsoXmitContextBase(i));
1654        }
1655        for (i = 0; i < 32; ++i) {
1656                if (!(ohci->ir_context_support & (1 << i)))
1657                        continue;
1658                sprintf(name, "IR%u", i);
1659                detect_dead_context(ohci, name, OHCI1394_IsoRcvContextBase(i));
1660        }
1661        /* TODO: maybe try to flush and restart the dead contexts */
1662}
1663
1664static u32 cycle_timer_ticks(u32 cycle_timer)
1665{
1666        u32 ticks;
1667
1668        ticks = cycle_timer & 0xfff;
1669        ticks += 3072 * ((cycle_timer >> 12) & 0x1fff);
1670        ticks += (3072 * 8000) * (cycle_timer >> 25);
1671
1672        return ticks;
1673}
1674
1675/*
1676 * Some controllers exhibit one or more of the following bugs when updating the
1677 * iso cycle timer register:
1678 *  - When the lowest six bits are wrapping around to zero, a read that happens
1679 *    at the same time will return garbage in the lowest ten bits.
1680 *  - When the cycleOffset field wraps around to zero, the cycleCount field is
1681 *    not incremented for about 60 ns.
1682 *  - Occasionally, the entire register reads zero.
1683 *
1684 * To catch these, we read the register three times and ensure that the
1685 * difference between each two consecutive reads is approximately the same, i.e.
1686 * less than twice the other.  Furthermore, any negative difference indicates an
1687 * error.  (A PCI read should take at least 20 ticks of the 24.576 MHz timer to
1688 * execute, so we have enough precision to compute the ratio of the differences.)
1689 */
1690static u32 get_cycle_time(struct fw_ohci *ohci)
1691{
1692        u32 c0, c1, c2;
1693        u32 t0, t1, t2;
1694        s32 diff01, diff12;
1695        int i;
1696
1697        c2 = reg_read(ohci, OHCI1394_IsochronousCycleTimer);
1698
1699        if (ohci->quirks & QUIRK_CYCLE_TIMER) {
1700                i = 0;
1701                c1 = c2;
1702                c2 = reg_read(ohci, OHCI1394_IsochronousCycleTimer);
1703                do {
1704                        c0 = c1;
1705                        c1 = c2;
1706                        c2 = reg_read(ohci, OHCI1394_IsochronousCycleTimer);
1707                        t0 = cycle_timer_ticks(c0);
1708                        t1 = cycle_timer_ticks(c1);
1709                        t2 = cycle_timer_ticks(c2);
1710                        diff01 = t1 - t0;
1711                        diff12 = t2 - t1;
1712                } while ((diff01 <= 0 || diff12 <= 0 ||
1713                          diff01 / diff12 >= 2 || diff12 / diff01 >= 2)
1714                         && i++ < 20);
1715        }
1716
1717        return c2;
1718}
1719
1720/*
1721 * This function has to be called at least every 64 seconds.  The bus_time
1722 * field stores not only the upper 25 bits of the BUS_TIME register but also
1723 * the most significant bit of the cycle timer in bit 6 so that we can detect
1724 * changes in this bit.
1725 */
1726static u32 update_bus_time(struct fw_ohci *ohci)
1727{
1728        u32 cycle_time_seconds = get_cycle_time(ohci) >> 25;
1729
1730        if (unlikely(!ohci->bus_time_running)) {
1731                reg_write(ohci, OHCI1394_IntMaskSet, OHCI1394_cycle64Seconds);
1732                ohci->bus_time = (lower_32_bits(get_seconds()) & ~0x7f) |
1733                                 (cycle_time_seconds & 0x40);
1734                ohci->bus_time_running = true;
1735        }
1736
1737        if ((ohci->bus_time & 0x40) != (cycle_time_seconds & 0x40))
1738                ohci->bus_time += 0x40;
1739
1740        return ohci->bus_time | cycle_time_seconds;
1741}
1742
1743static int get_status_for_port(struct fw_ohci *ohci, int port_index)
1744{
1745        int reg;
1746
1747        mutex_lock(&ohci->phy_reg_mutex);
1748        reg = write_phy_reg(ohci, 7, port_index);
1749        if (reg >= 0)
1750                reg = read_phy_reg(ohci, 8);
1751        mutex_unlock(&ohci->phy_reg_mutex);
1752        if (reg < 0)
1753                return reg;
1754
1755        switch (reg & 0x0f) {
1756        case 0x06:
1757                return 2;       /* is child node (connected to parent node) */
1758        case 0x0e:
1759                return 3;       /* is parent node (connected to child node) */
1760        }
1761        return 1;               /* not connected */
1762}
1763
1764static int get_self_id_pos(struct fw_ohci *ohci, u32 self_id,
1765        int self_id_count)
1766{
1767        int i;
1768        u32 entry;
1769
1770        for (i = 0; i < self_id_count; i++) {
1771                entry = ohci->self_id_buffer[i];
1772                if ((self_id & 0xff000000) == (entry & 0xff000000))
1773                        return -1;
1774                if ((self_id & 0xff000000) < (entry & 0xff000000))
1775                        return i;
1776        }
1777        return i;
1778}
1779
1780static int initiated_reset(struct fw_ohci *ohci)
1781{
1782        int reg;
1783        int ret = 0;
1784
1785        mutex_lock(&ohci->phy_reg_mutex);
1786        reg = write_phy_reg(ohci, 7, 0xe0); /* Select page 7 */
1787        if (reg >= 0) {
1788                reg = read_phy_reg(ohci, 8);
1789                reg |= 0x40;
1790                reg = write_phy_reg(ohci, 8, reg); /* set PMODE bit */
1791                if (reg >= 0) {
1792                        reg = read_phy_reg(ohci, 12); /* read register 12 */
1793                        if (reg >= 0) {
1794                                if ((reg & 0x08) == 0x08) {
1795                                        /* bit 3 indicates "initiated reset" */
1796                                        ret = 0x2;
1797                                }
1798                        }
1799                }
1800        }
1801        mutex_unlock(&ohci->phy_reg_mutex);
1802        return ret;
1803}
1804
1805/*
1806 * TI TSB82AA2B and TSB12LV26 do not receive the selfID of a locally
1807 * attached TSB41BA3D phy; see http://www.ti.com/litv/pdf/sllz059.
1808 * Construct the selfID from phy register contents.
1809 */
1810static int find_and_insert_self_id(struct fw_ohci *ohci, int self_id_count)
1811{
1812        int reg, i, pos, status;
1813        /* link active 1, speed 3, bridge 0, contender 1, more packets 0 */
1814        u32 self_id = 0x8040c800;
1815
1816        reg = reg_read(ohci, OHCI1394_NodeID);
1817        if (!(reg & OHCI1394_NodeID_idValid)) {
1818                dev_notice(ohci->card.device,
1819                           "node ID not valid, new bus reset in progress\n");
1820                return -EBUSY;
1821        }
1822        self_id |= ((reg & 0x3f) << 24); /* phy ID */
1823
1824        reg = ohci_read_phy_reg(&ohci->card, 4);
1825        if (reg < 0)
1826                return reg;
1827        self_id |= ((reg & 0x07) << 8); /* power class */
1828
1829        reg = ohci_read_phy_reg(&ohci->card, 1);
1830        if (reg < 0)
1831                return reg;
1832        self_id |= ((reg & 0x3f) << 16); /* gap count */
1833
1834        for (i = 0; i < 3; i++) {
1835                status = get_status_for_port(ohci, i);
1836                if (status < 0)
1837                        return status;
1838                self_id |= ((status & 0x3) << (6 - (i * 2)));
1839        }
1840
1841        self_id |= initiated_reset(ohci);
1842
1843        pos = get_self_id_pos(ohci, self_id, self_id_count);
1844        if (pos >= 0) {
1845                memmove(&(ohci->self_id_buffer[pos+1]),
1846                        &(ohci->self_id_buffer[pos]),
1847                        (self_id_count - pos) * sizeof(*ohci->self_id_buffer));
1848                ohci->self_id_buffer[pos] = self_id;
1849                self_id_count++;
1850        }
1851        return self_id_count;
1852}
1853
1854static void bus_reset_work(struct work_struct *work)
1855{
1856        struct fw_ohci *ohci =
1857                container_of(work, struct fw_ohci, bus_reset_work);
1858        int self_id_count, generation, new_generation, i, j;
1859        u32 reg;
1860        void *free_rom = NULL;
1861        dma_addr_t free_rom_bus = 0;
1862        bool is_new_root;
1863
1864        reg = reg_read(ohci, OHCI1394_NodeID);
1865        if (!(reg & OHCI1394_NodeID_idValid)) {
1866                dev_notice(ohci->card.device,
1867                           "node ID not valid, new bus reset in progress\n");
1868                return;
1869        }
1870        if ((reg & OHCI1394_NodeID_nodeNumber) == 63) {
1871                dev_notice(ohci->card.device, "malconfigured bus\n");
1872                return;
1873        }
1874        ohci->node_id = reg & (OHCI1394_NodeID_busNumber |
1875                               OHCI1394_NodeID_nodeNumber);
1876
1877        is_new_root = (reg & OHCI1394_NodeID_root) != 0;
1878        if (!(ohci->is_root && is_new_root))
1879                reg_write(ohci, OHCI1394_LinkControlSet,
1880                          OHCI1394_LinkControl_cycleMaster);
1881        ohci->is_root = is_new_root;
1882
1883        reg = reg_read(ohci, OHCI1394_SelfIDCount);
1884        if (reg & OHCI1394_SelfIDCount_selfIDError) {
1885                dev_notice(ohci->card.device, "inconsistent self IDs\n");
1886                return;
1887        }
1888        /*
1889         * The count in the SelfIDCount register is the number of
1890         * bytes in the self ID receive buffer.  Since we also receive
1891         * the inverted quadlets and a header quadlet, we shift one
1892         * bit extra to get the actual number of self IDs.
1893         */
1894        self_id_count = (reg >> 3) & 0xff;
1895
1896        if (self_id_count > 252) {
1897                dev_notice(ohci->card.device, "inconsistent self IDs\n");
1898                return;
1899        }
1900
1901        generation = (cond_le32_to_cpu(ohci->self_id_cpu[0]) >> 16) & 0xff;
1902        rmb();
1903
1904        for (i = 1, j = 0; j < self_id_count; i += 2, j++) {
1905                if (ohci->self_id_cpu[i] != ~ohci->self_id_cpu[i + 1]) {
1906                        /*
1907                         * If the invalid data looks like a cycle start packet,
1908                         * it's likely to be the result of the cycle master
1909                         * having a wrong gap count.  In this case, the self IDs
1910                         * so far are valid and should be processed so that the
1911                         * bus manager can then correct the gap count.
1912                         */
1913                        if (cond_le32_to_cpu(ohci->self_id_cpu[i])
1914                                                        == 0xffff008f) {
1915                                dev_notice(ohci->card.device,
1916                                           "ignoring spurious self IDs\n");
1917                                self_id_count = j;
1918                                break;
1919                        } else {
1920                                dev_notice(ohci->card.device,
1921                                           "inconsistent self IDs\n");
1922                                return;
1923                        }
1924                }
1925                ohci->self_id_buffer[j] =
1926                                cond_le32_to_cpu(ohci->self_id_cpu[i]);
1927        }
1928
1929        if (ohci->quirks & QUIRK_TI_SLLZ059) {
1930                self_id_count = find_and_insert_self_id(ohci, self_id_count);
1931                if (self_id_count < 0) {
1932                        dev_notice(ohci->card.device,
1933                                   "could not construct local self ID\n");
1934                        return;
1935                }
1936        }
1937
1938        if (self_id_count == 0) {
1939                dev_notice(ohci->card.device, "inconsistent self IDs\n");
1940                return;
1941        }
1942        rmb();
1943
1944        /*
1945         * Check the consistency of the self IDs we just read.  The
1946         * problem we face is that a new bus reset can start while we
1947         * read out the self IDs from the DMA buffer. If this happens,
1948         * the DMA buffer will be overwritten with new self IDs and we
1949         * will read out inconsistent data.  The OHCI specification
1950         * (section 11.2) recommends a technique similar to
1951         * linux/seqlock.h, where we remember the generation of the
1952         * self IDs in the buffer before reading them out and compare
1953         * it to the current generation after reading them out.  If
1954         * the two generations match we know we have a consistent set
1955         * of self IDs.
1956         */
1957
1958        new_generation = (reg_read(ohci, OHCI1394_SelfIDCount) >> 16) & 0xff;
1959        if (new_generation != generation) {
1960                dev_notice(ohci->card.device,
1961                           "new bus reset, discarding self ids\n");
1962                return;
1963        }
1964
1965        /* FIXME: Document how the locking works. */
1966        spin_lock_irq(&ohci->lock);
1967
1968        ohci->generation = -1; /* prevent AT packet queueing */
1969        context_stop(&ohci->at_request_ctx);
1970        context_stop(&ohci->at_response_ctx);
1971
1972        spin_unlock_irq(&ohci->lock);
1973
1974        /*
1975         * Per OHCI 1.2 draft, clause 7.2.3.3, hardware may leave unsent
1976         * packets in the AT queues and software needs to drain them.
1977         * Some OHCI 1.1 controllers (JMicron) apparently require this too.
1978         */
1979        at_context_flush(&ohci->at_request_ctx);
1980        at_context_flush(&ohci->at_response_ctx);
1981
1982        spin_lock_irq(&ohci->lock);
1983
1984        ohci->generation = generation;
1985        reg_write(ohci, OHCI1394_IntEventClear, OHCI1394_busReset);
1986
1987        if (ohci->quirks & QUIRK_RESET_PACKET)
1988                ohci->request_generation = generation;
1989
1990        /*
1991         * This next bit is unrelated to the AT context stuff but we
1992         * have to do it under the spinlock also.  If a new config rom
1993         * was set up before this reset, the old one is now no longer
1994         * in use and we can free it. Update the config rom pointers
1995         * to point to the current config rom and clear the
1996         * next_config_rom pointer so a new update can take place.
1997         */
1998
1999        if (ohci->next_config_rom != NULL) {
2000                if (ohci->next_config_rom != ohci->config_rom) {
2001                        free_rom      = ohci->config_rom;
2002                        free_rom_bus  = ohci->config_rom_bus;
2003                }
2004                ohci->config_rom      = ohci->next_config_rom;
2005                ohci->config_rom_bus  = ohci->next_config_rom_bus;
2006                ohci->next_config_rom = NULL;
2007
2008                /*
2009                 * Restore config_rom image and manually update
2010                 * config_rom registers.  Writing the header quadlet
2011                 * will indicate that the config rom is ready, so we
2012                 * do that last.
2013                 */
2014                reg_write(ohci, OHCI1394_BusOptions,
2015                          be32_to_cpu(ohci->config_rom[2]));
2016                ohci->config_rom[0] = ohci->next_header;
2017                reg_write(ohci, OHCI1394_ConfigROMhdr,
2018                          be32_to_cpu(ohci->next_header));
2019        }
2020
2021#ifdef CONFIG_FIREWIRE_OHCI_REMOTE_DMA
2022        reg_write(ohci, OHCI1394_PhyReqFilterHiSet, ~0);
2023        reg_write(ohci, OHCI1394_PhyReqFilterLoSet, ~0);
2024#endif
2025
2026        spin_unlock_irq(&ohci->lock);
2027
2028        if (free_rom)
2029                dma_free_coherent(ohci->card.device, CONFIG_ROM_SIZE,
2030                                  free_rom, free_rom_bus);
2031
2032        log_selfids(ohci, generation, self_id_count);
2033
2034        fw_core_handle_bus_reset(&ohci->card, ohci->node_id, generation,
2035                                 self_id_count, ohci->self_id_buffer,
2036                                 ohci->csr_state_setclear_abdicate);
2037        ohci->csr_state_setclear_abdicate = false;
2038}
2039
2040static irqreturn_t irq_handler(int irq, void *data)
2041{
2042        struct fw_ohci *ohci = data;
2043        u32 event, iso_event;
2044        int i;
2045
2046        event = reg_read(ohci, OHCI1394_IntEventClear);
2047
2048        if (!event || !~event)
2049                return IRQ_NONE;
2050
2051        /*
2052         * busReset and postedWriteErr must not be cleared yet
2053         * (OHCI 1.1 clauses 7.2.3.2 and 13.2.8.1)
2054         */
2055        reg_write(ohci, OHCI1394_IntEventClear,
2056                  event & ~(OHCI1394_busReset | OHCI1394_postedWriteErr));
2057        log_irqs(ohci, event);
2058
2059        if (event & OHCI1394_selfIDComplete)
2060                queue_work(fw_workqueue, &ohci->bus_reset_work);
2061
2062        if (event & OHCI1394_RQPkt)
2063                tasklet_schedule(&ohci->ar_request_ctx.tasklet);
2064
2065        if (event & OHCI1394_RSPkt)
2066                tasklet_schedule(&ohci->ar_response_ctx.tasklet);
2067
2068        if (event & OHCI1394_reqTxComplete)
2069                tasklet_schedule(&ohci->at_request_ctx.tasklet);
2070
2071        if (event & OHCI1394_respTxComplete)
2072                tasklet_schedule(&ohci->at_response_ctx.tasklet);
2073
2074        if (event & OHCI1394_isochRx) {
2075                iso_event = reg_read(ohci, OHCI1394_IsoRecvIntEventClear);
2076                reg_write(ohci, OHCI1394_IsoRecvIntEventClear, iso_event);
2077
2078                while (iso_event) {
2079                        i = ffs(iso_event) - 1;
2080                        tasklet_schedule(
2081                                &ohci->ir_context_list[i].context.tasklet);
2082                        iso_event &= ~(1 << i);
2083                }
2084        }
2085
2086        if (event & OHCI1394_isochTx) {
2087                iso_event = reg_read(ohci, OHCI1394_IsoXmitIntEventClear);
2088                reg_write(ohci, OHCI1394_IsoXmitIntEventClear, iso_event);
2089
2090                while (iso_event) {
2091                        i = ffs(iso_event) - 1;
2092                        tasklet_schedule(
2093                                &ohci->it_context_list[i].context.tasklet);
2094                        iso_event &= ~(1 << i);
2095                }
2096        }
2097
2098        if (unlikely(event & OHCI1394_regAccessFail))
2099                dev_err(ohci->card.device, "register access failure\n");
2100
2101        if (unlikely(event & OHCI1394_postedWriteErr)) {
2102                reg_read(ohci, OHCI1394_PostedWriteAddressHi);
2103                reg_read(ohci, OHCI1394_PostedWriteAddressLo);
2104                reg_write(ohci, OHCI1394_IntEventClear,
2105                          OHCI1394_postedWriteErr);
2106                if (printk_ratelimit())
2107                        dev_err(ohci->card.device, "PCI posted write error\n");
2108        }
2109
2110        if (unlikely(event & OHCI1394_cycleTooLong)) {
2111                if (printk_ratelimit())
2112                        dev_notice(ohci->card.device,
2113                                   "isochronous cycle too long\n");
2114                reg_write(ohci, OHCI1394_LinkControlSet,
2115                          OHCI1394_LinkControl_cycleMaster);
2116        }
2117
2118        if (unlikely(event & OHCI1394_cycleInconsistent)) {
2119                /*
2120                 * We need to clear this event bit in order to make
2121                 * cycleMatch isochronous I/O work.  In theory we should
2122                 * stop active cycleMatch iso contexts now and restart
2123                 * them at least two cycles later.  (FIXME?)
2124                 */
2125                if (printk_ratelimit())
2126                        dev_notice(ohci->card.device,
2127                                   "isochronous cycle inconsistent\n");
2128        }
2129
2130        if (unlikely(event & OHCI1394_unrecoverableError))
2131                handle_dead_contexts(ohci);
2132
2133        if (event & OHCI1394_cycle64Seconds) {
2134                spin_lock(&ohci->lock);
2135                update_bus_time(ohci);
2136                spin_unlock(&ohci->lock);
2137        } else
2138                flush_writes(ohci);
2139
2140        return IRQ_HANDLED;
2141}
2142
2143static int software_reset(struct fw_ohci *ohci)
2144{
2145        u32 val;
2146        int i;
2147
2148        reg_write(ohci, OHCI1394_HCControlSet, OHCI1394_HCControl_softReset);
2149        for (i = 0; i < 500; i++) {
2150                val = reg_read(ohci, OHCI1394_HCControlSet);
2151                if (!~val)
2152                        return -ENODEV; /* Card was ejected. */
2153
2154                if (!(val & OHCI1394_HCControl_softReset))
2155                        return 0;
2156
2157                msleep(1);
2158        }
2159
2160        return -EBUSY;
2161}
2162
2163static void copy_config_rom(__be32 *dest, const __be32 *src, size_t length)
2164{
2165        size_t size = length * 4;
2166
2167        memcpy(dest, src, size);
2168        if (size < CONFIG_ROM_SIZE)
2169                memset(&dest[length], 0, CONFIG_ROM_SIZE - size);
2170}
2171
2172static int configure_1394a_enhancements(struct fw_ohci *ohci)
2173{
2174        bool enable_1394a;
2175        int ret, clear, set, offset;
2176
2177        /* Check if the driver should configure link and PHY. */
2178        if (!(reg_read(ohci, OHCI1394_HCControlSet) &
2179              OHCI1394_HCControl_programPhyEnable))
2180                return 0;
2181
2182        /* Paranoia: check whether the PHY supports 1394a, too. */
2183        enable_1394a = false;
2184        ret = read_phy_reg(ohci, 2);
2185        if (ret < 0)
2186                return ret;
2187        if ((ret & PHY_EXTENDED_REGISTERS) == PHY_EXTENDED_REGISTERS) {
2188                ret = read_paged_phy_reg(ohci, 1, 8);
2189                if (ret < 0)
2190                        return ret;
2191                if (ret >= 1)
2192                        enable_1394a = true;
2193        }
2194
2195        if (ohci->quirks & QUIRK_NO_1394A)
2196                enable_1394a = false;
2197
2198        /* Configure PHY and link consistently. */
2199        if (enable_1394a) {
2200                clear = 0;
2201                set = PHY_ENABLE_ACCEL | PHY_ENABLE_MULTI;
2202        } else {
2203                clear = PHY_ENABLE_ACCEL | PHY_ENABLE_MULTI;
2204                set = 0;
2205        }
2206        ret = update_phy_reg(ohci, 5, clear, set);
2207        if (ret < 0)
2208                return ret;
2209
2210        if (enable_1394a)
2211                offset = OHCI1394_HCControlSet;
2212        else
2213                offset = OHCI1394_HCControlClear;
2214        reg_write(ohci, offset, OHCI1394_HCControl_aPhyEnhanceEnable);
2215
2216        /* Clean up: configuration has been taken care of. */
2217        reg_write(ohci, OHCI1394_HCControlClear,
2218                  OHCI1394_HCControl_programPhyEnable);
2219
2220        return 0;
2221}
2222
2223static int probe_tsb41ba3d(struct fw_ohci *ohci)
2224{
2225        /* TI vendor ID = 0x080028, TSB41BA3D product ID = 0x833005 (sic) */
2226        static const u8 id[] = { 0x08, 0x00, 0x28, 0x83, 0x30, 0x05, };
2227        int reg, i;
2228
2229        reg = read_phy_reg(ohci, 2);
2230        if (reg < 0)
2231                return reg;
2232        if ((reg & PHY_EXTENDED_REGISTERS) != PHY_EXTENDED_REGISTERS)
2233                return 0;
2234
2235        for (i = ARRAY_SIZE(id) - 1; i >= 0; i--) {
2236                reg = read_paged_phy_reg(ohci, 1, i + 10);
2237                if (reg < 0)
2238                        return reg;
2239                if (reg != id[i])
2240                        return 0;
2241        }
2242        return 1;
2243}
2244
2245static int ohci_enable(struct fw_card *card,
2246                       const __be32 *config_rom, size_t length)
2247{
2248        struct fw_ohci *ohci = fw_ohci(card);
2249        struct pci_dev *dev = to_pci_dev(card->device);
2250        u32 lps, version, irqs;
2251        int i, ret;
2252
2253        if (software_reset(ohci)) {
2254                dev_err(card->device, "failed to reset ohci card\n");
2255                return -EBUSY;
2256        }
2257
2258        /*
2259         * Now enable LPS, which we need in order to start accessing
2260         * most of the registers.  In fact, on some cards (ALI M5251),
2261         * accessing registers in the SClk domain without LPS enabled
2262         * will lock up the machine.  Wait 50msec to make sure we have
2263         * full link enabled.  However, with some cards (well, at least
2264         * a JMicron PCIe card), we have to try again sometimes.
2265         */
2266        reg_write(ohci, OHCI1394_HCControlSet,
2267                  OHCI1394_HCControl_LPS |
2268                  OHCI1394_HCControl_postedWriteEnable);
2269        flush_writes(ohci);
2270
2271        for (lps = 0, i = 0; !lps && i < 3; i++) {
2272                msleep(50);
2273                lps = reg_read(ohci, OHCI1394_HCControlSet) &
2274                      OHCI1394_HCControl_LPS;
2275        }
2276
2277        if (!lps) {
2278                dev_err(card->device, "failed to set Link Power Status\n");
2279                return -EIO;
2280        }
2281
2282        if (ohci->quirks & QUIRK_TI_SLLZ059) {
2283                ret = probe_tsb41ba3d(ohci);
2284                if (ret < 0)
2285                        return ret;
2286                if (ret)
2287                        dev_notice(card->device, "local TSB41BA3D phy\n");
2288                else
2289                        ohci->quirks &= ~QUIRK_TI_SLLZ059;
2290        }
2291
2292        reg_write(ohci, OHCI1394_HCControlClear,
2293                  OHCI1394_HCControl_noByteSwapData);
2294
2295        reg_write(ohci, OHCI1394_SelfIDBuffer, ohci->self_id_bus);
2296        reg_write(ohci, OHCI1394_LinkControlSet,
2297                  OHCI1394_LinkControl_cycleTimerEnable |
2298                  OHCI1394_LinkControl_cycleMaster);
2299
2300        reg_write(ohci, OHCI1394_ATRetries,
2301                  OHCI1394_MAX_AT_REQ_RETRIES |
2302                  (OHCI1394_MAX_AT_RESP_RETRIES << 4) |
2303                  (OHCI1394_MAX_PHYS_RESP_RETRIES << 8) |
2304                  (200 << 16));
2305
2306        ohci->bus_time_running = false;
2307
2308        for (i = 0; i < 32; i++)
2309                if (ohci->ir_context_support & (1 << i))
2310                        reg_write(ohci, OHCI1394_IsoRcvContextControlClear(i),
2311                                  IR_CONTEXT_MULTI_CHANNEL_MODE);
2312
2313        version = reg_read(ohci, OHCI1394_Version) & 0x00ff00ff;
2314        if (version >= OHCI_VERSION_1_1) {
2315                reg_write(ohci, OHCI1394_InitialChannelsAvailableHi,
2316                          0xfffffffe);
2317                card->broadcast_channel_auto_allocated = true;
2318        }
2319
2320        /* Get implemented bits of the priority arbitration request counter. */
2321        reg_write(ohci, OHCI1394_FairnessControl, 0x3f);
2322        ohci->pri_req_max = reg_read(ohci, OHCI1394_FairnessControl) & 0x3f;
2323        reg_write(ohci, OHCI1394_FairnessControl, 0);
2324        card->priority_budget_implemented = ohci->pri_req_max != 0;
2325
2326        reg_write(ohci, OHCI1394_PhyUpperBound, 0x00010000);
2327        reg_write(ohci, OHCI1394_IntEventClear, ~0);
2328        reg_write(ohci, OHCI1394_IntMaskClear, ~0);
2329
2330        ret = configure_1394a_enhancements(ohci);
2331        if (ret < 0)
2332                return ret;
2333
2334        /* Activate link_on bit and contender bit in our self ID packets.*/
2335        ret = ohci_update_phy_reg(card, 4, 0, PHY_LINK_ACTIVE | PHY_CONTENDER);
2336        if (ret < 0)
2337                return ret;
2338
2339        /*
2340         * When the link is not yet enabled, the atomic config rom
2341         * update mechanism described below in ohci_set_config_rom()
2342         * is not active.  We have to update ConfigRomHeader and
2343         * BusOptions manually, and the write to ConfigROMmap takes
2344         * effect immediately.  We tie this to the enabling of the
2345         * link, so we have a valid config rom before enabling - the
2346         * OHCI requires that ConfigROMhdr and BusOptions have valid
2347         * values before enabling.
2348         *
2349         * However, when the ConfigROMmap is written, some controllers
2350         * always read back quadlets 0 and 2 from the config rom to
2351         * the ConfigRomHeader and BusOptions registers on bus reset.
2352         * They shouldn't do that in this initial case where the link
2353         * isn't enabled.  This means we have to use the same
2354         * workaround here, setting the bus header to 0 and then write
2355         * the right values in the bus reset tasklet.
2356         */
2357
2358        if (config_rom) {
2359                ohci->next_config_rom =
2360                        dma_alloc_coherent(ohci->card.device, CONFIG_ROM_SIZE,
2361                                           &ohci->next_config_rom_bus,
2362                                           GFP_KERNEL);
2363                if (ohci->next_config_rom == NULL)
2364                        return -ENOMEM;
2365
2366                copy_config_rom(ohci->next_config_rom, config_rom, length);
2367        } else {
2368                /*
2369                 * In the suspend case, config_rom is NULL, which
2370                 * means that we just reuse the old config rom.
2371                 */
2372                ohci->next_config_rom = ohci->config_rom;
2373                ohci->next_config_rom_bus = ohci->config_rom_bus;
2374        }
2375
2376        ohci->next_header = ohci->next_config_rom[0];
2377        ohci->next_config_rom[0] = 0;
2378        reg_write(ohci, OHCI1394_ConfigROMhdr, 0);
2379        reg_write(ohci, OHCI1394_BusOptions,
2380                  be32_to_cpu(ohci->next_config_rom[2]));
2381        reg_write(ohci, OHCI1394_ConfigROMmap, ohci->next_config_rom_bus);
2382
2383        reg_write(ohci, OHCI1394_AsReqFilterHiSet, 0x80000000);
2384
2385        if (!(ohci->quirks & QUIRK_NO_MSI))
2386                pci_enable_msi(dev);
2387        if (request_irq(dev->irq, irq_handler,
2388                        pci_dev_msi_enabled(dev) ? 0 : IRQF_SHARED,
2389                        ohci_driver_name, ohci)) {
2390                dev_err(card->device, "failed to allocate interrupt %d\n",
2391                        dev->irq);
2392                pci_disable_msi(dev);
2393
2394                if (config_rom) {
2395                        dma_free_coherent(ohci->card.device, CONFIG_ROM_SIZE,
2396                                          ohci->next_config_rom,
2397                                          ohci->next_config_rom_bus);
2398                        ohci->next_config_rom = NULL;
2399                }
2400                return -EIO;
2401        }
2402
2403        irqs =  OHCI1394_reqTxComplete | OHCI1394_respTxComplete |
2404                OHCI1394_RQPkt | OHCI1394_RSPkt |
2405                OHCI1394_isochTx | OHCI1394_isochRx |
2406                OHCI1394_postedWriteErr |
2407                OHCI1394_selfIDComplete |
2408                OHCI1394_regAccessFail |
2409                OHCI1394_cycleInconsistent |
2410                OHCI1394_unrecoverableError |
2411                OHCI1394_cycleTooLong |
2412                OHCI1394_masterIntEnable;
2413        if (param_debug & OHCI_PARAM_DEBUG_BUSRESETS)
2414                irqs |= OHCI1394_busReset;
2415        reg_write(ohci, OHCI1394_IntMaskSet, irqs);
2416
2417        reg_write(ohci, OHCI1394_HCControlSet,
2418                  OHCI1394_HCControl_linkEnable |
2419                  OHCI1394_HCControl_BIBimageValid);
2420
2421        reg_write(ohci, OHCI1394_LinkControlSet,
2422                  OHCI1394_LinkControl_rcvSelfID |
2423                  OHCI1394_LinkControl_rcvPhyPkt);
2424
2425        ar_context_run(&ohci->ar_request_ctx);
2426        ar_context_run(&ohci->ar_response_ctx);
2427
2428        flush_writes(ohci);
2429
2430        /* We are ready to go, reset bus to finish initialization. */
2431        fw_schedule_bus_reset(&ohci->card, false, true);
2432
2433        return 0;
2434}
2435
2436static int ohci_set_config_rom(struct fw_card *card,
2437                               const __be32 *config_rom, size_t length)
2438{
2439        struct fw_ohci *ohci;
2440        __be32 *next_config_rom;
2441        dma_addr_t uninitialized_var(next_config_rom_bus);
2442
2443        ohci = fw_ohci(card);
2444
2445        /*
2446         * When the OHCI controller is enabled, the config rom update
2447         * mechanism is a bit tricky, but easy enough to use.  See
2448         * section 5.5.6 in the OHCI specification.
2449         *
2450         * The OHCI controller caches the new config rom address in a
2451         * shadow register (ConfigROMmapNext) and needs a bus reset
2452         * for the changes to take place.  When the bus reset is
2453         * detected, the controller loads the new values for the
2454         * ConfigRomHeader and BusOptions registers from the specified
2455         * config rom and loads ConfigROMmap from the ConfigROMmapNext
2456         * shadow register. All automatically and atomically.
2457         *
2458         * Now, there's a twist to this story.  The automatic load of
2459         * ConfigRomHeader and BusOptions doesn't honor the
2460         * noByteSwapData bit, so with a be32 config rom, the
2461         * controller will load be32 values in to these registers
2462         * during the atomic update, even on litte endian
2463         * architectures.  The workaround we use is to put a 0 in the
2464         * header quadlet; 0 is endian agnostic and means that the
2465         * config rom isn't ready yet.  In the bus reset tasklet we
2466         * then set up the real values for the two registers.
2467         *
2468         * We use ohci->lock to avoid racing with the code that sets
2469         * ohci->next_config_rom to NULL (see bus_reset_work).
2470         */
2471
2472        next_config_rom =
2473                dma_alloc_coherent(ohci->card.device, CONFIG_ROM_SIZE,
2474                                   &next_config_rom_bus, GFP_KERNEL);
2475        if (next_config_rom == NULL)
2476                return -ENOMEM;
2477
2478        spin_lock_irq(&ohci->lock);
2479
2480        /*
2481         * If there is not an already pending config_rom update,
2482         * push our new allocation into the ohci->next_config_rom
2483         * and then mark the local variable as null so that we
2484         * won't deallocate the new buffer.
2485         *
2486         * OTOH, if there is a pending config_rom update, just
2487         * use that buffer with the new config_rom data, and
2488         * let this routine free the unused DMA allocation.
2489         */
2490
2491        if (ohci->next_config_rom == NULL) {
2492                ohci->next_config_rom = next_config_rom;
2493                ohci->next_config_rom_bus = next_config_rom_bus;
2494                next_config_rom = NULL;
2495        }
2496
2497        copy_config_rom(ohci->next_config_rom, config_rom, length);
2498
2499        ohci->next_header = config_rom[0];
2500        ohci->next_config_rom[0] = 0;
2501
2502        reg_write(ohci, OHCI1394_ConfigROMmap, ohci->next_config_rom_bus);
2503
2504        spin_unlock_irq(&ohci->lock);
2505
2506        /* If we didn't use the DMA allocation, delete it. */
2507        if (next_config_rom != NULL)
2508                dma_free_coherent(ohci->card.device, CONFIG_ROM_SIZE,
2509                                  next_config_rom, next_config_rom_bus);
2510
2511        /*
2512         * Now initiate a bus reset to have the changes take
2513         * effect. We clean up the old config rom memory and DMA
2514         * mappings in the bus reset tasklet, since the OHCI
2515         * controller could need to access it before the bus reset
2516         * takes effect.
2517         */
2518
2519        fw_schedule_bus_reset(&ohci->card, true, true);
2520
2521        return 0;
2522}
2523
2524static void ohci_send_request(struct fw_card *card, struct fw_packet *packet)
2525{
2526        struct fw_ohci *ohci = fw_ohci(card);
2527
2528        at_context_transmit(&ohci->at_request_ctx, packet);
2529}
2530
2531static void ohci_send_response(struct fw_card *card, struct fw_packet *packet)
2532{
2533        struct fw_ohci *ohci = fw_ohci(card);
2534
2535        at_context_transmit(&ohci->at_response_ctx, packet);
2536}
2537
2538static int ohci_cancel_packet(struct fw_card *card, struct fw_packet *packet)
2539{
2540        struct fw_ohci *ohci = fw_ohci(card);
2541        struct context *ctx = &ohci->at_request_ctx;
2542        struct driver_data *driver_data = packet->driver_data;
2543        int ret = -ENOENT;
2544
2545        tasklet_disable(&ctx->tasklet);
2546
2547        if (packet->ack != 0)
2548                goto out;
2549
2550        if (packet->payload_mapped)
2551                dma_unmap_single(ohci->card.device, packet->payload_bus,
2552                                 packet->payload_length, DMA_TO_DEVICE);
2553
2554        log_ar_at_event(ohci, 'T', packet->speed, packet->header, 0x20);
2555        driver_data->packet = NULL;
2556        packet->ack = RCODE_CANCELLED;
2557        packet->callback(packet, &ohci->card, packet->ack);
2558        ret = 0;
2559 out:
2560        tasklet_enable(&ctx->tasklet);
2561
2562        return ret;
2563}
2564
2565static int ohci_enable_phys_dma(struct fw_card *card,
2566                                int node_id, int generation)
2567{
2568#ifdef CONFIG_FIREWIRE_OHCI_REMOTE_DMA
2569        return 0;
2570#else
2571        struct fw_ohci *ohci = fw_ohci(card);
2572        unsigned long flags;
2573        int n, ret = 0;
2574
2575        /*
2576         * FIXME:  Make sure this bitmask is cleared when we clear the busReset
2577         * interrupt bit.  Clear physReqResourceAllBuses on bus reset.
2578         */
2579
2580        spin_lock_irqsave(&ohci->lock, flags);
2581
2582        if (ohci->generation != generation) {
2583                ret = -ESTALE;
2584                goto out;
2585        }
2586
2587        /*
2588         * Note, if the node ID contains a non-local bus ID, physical DMA is
2589         * enabled for _all_ nodes on remote buses.
2590         */
2591
2592        n = (node_id & 0xffc0) == LOCAL_BUS ? node_id & 0x3f : 63;
2593        if (n < 32)
2594                reg_write(ohci, OHCI1394_PhyReqFilterLoSet, 1 << n);
2595        else
2596                reg_write(ohci, OHCI1394_PhyReqFilterHiSet, 1 << (n - 32));
2597
2598        flush_writes(ohci);
2599 out:
2600        spin_unlock_irqrestore(&ohci->lock, flags);
2601
2602        return ret;
2603#endif /* CONFIG_FIREWIRE_OHCI_REMOTE_DMA */
2604}
2605
2606static u32 ohci_read_csr(struct fw_card *card, int csr_offset)
2607{
2608        struct fw_ohci *ohci = fw_ohci(card);
2609        unsigned long flags;
2610        u32 value;
2611
2612        switch (csr_offset) {
2613        case CSR_STATE_CLEAR:
2614        case CSR_STATE_SET:
2615                if (ohci->is_root &&
2616                    (reg_read(ohci, OHCI1394_LinkControlSet) &
2617                     OHCI1394_LinkControl_cycleMaster))
2618                        value = CSR_STATE_BIT_CMSTR;
2619                else
2620                        value = 0;
2621                if (ohci->csr_state_setclear_abdicate)
2622                        value |= CSR_STATE_BIT_ABDICATE;
2623
2624                return value;
2625
2626        case CSR_NODE_IDS:
2627                return reg_read(ohci, OHCI1394_NodeID) << 16;
2628
2629        case CSR_CYCLE_TIME:
2630                return get_cycle_time(ohci);
2631
2632        case CSR_BUS_TIME:
2633                /*
2634                 * We might be called just after the cycle timer has wrapped
2635                 * around but just before the cycle64Seconds handler, so we
2636                 * better check here, too, if the bus time needs to be updated.
2637                 */
2638                spin_lock_irqsave(&ohci->lock, flags);
2639                value = update_bus_time(ohci);
2640                spin_unlock_irqrestore(&ohci->lock, flags);
2641                return value;
2642
2643        case CSR_BUSY_TIMEOUT:
2644                value = reg_read(ohci, OHCI1394_ATRetries);
2645                return (value >> 4) & 0x0ffff00f;
2646
2647        case CSR_PRIORITY_BUDGET:
2648                return (reg_read(ohci, OHCI1394_FairnessControl) & 0x3f) |
2649                        (ohci->pri_req_max << 8);
2650
2651        default:
2652                WARN_ON(1);
2653                return 0;
2654        }
2655}
2656
2657static void ohci_write_csr(struct fw_card *card, int csr_offset, u32 value)
2658{
2659        struct fw_ohci *ohci = fw_ohci(card);
2660        unsigned long flags;
2661
2662        switch (csr_offset) {
2663        case CSR_STATE_CLEAR:
2664                if ((value & CSR_STATE_BIT_CMSTR) && ohci->is_root) {
2665                        reg_write(ohci, OHCI1394_LinkControlClear,
2666                                  OHCI1394_LinkControl_cycleMaster);
2667                        flush_writes(ohci);
2668                }
2669                if (value & CSR_STATE_BIT_ABDICATE)
2670                        ohci->csr_state_setclear_abdicate = false;
2671                break;
2672
2673        case CSR_STATE_SET:
2674                if ((value & CSR_STATE_BIT_CMSTR) && ohci->is_root) {
2675                        reg_write(ohci, OHCI1394_LinkControlSet,
2676                                  OHCI1394_LinkControl_cycleMaster);
2677                        flush_writes(ohci);
2678                }
2679                if (value & CSR_STATE_BIT_ABDICATE)
2680                        ohci->csr_state_setclear_abdicate = true;
2681                break;
2682
2683        case CSR_NODE_IDS:
2684                reg_write(ohci, OHCI1394_NodeID, value >> 16);
2685                flush_writes(ohci);
2686                break;
2687
2688        case CSR_CYCLE_TIME:
2689                reg_write(ohci, OHCI1394_IsochronousCycleTimer, value);
2690                reg_write(ohci, OHCI1394_IntEventSet,
2691                          OHCI1394_cycleInconsistent);
2692                flush_writes(ohci);
2693                break;
2694
2695        case CSR_BUS_TIME:
2696                spin_lock_irqsave(&ohci->lock, flags);
2697                ohci->bus_time = (update_bus_time(ohci) & 0x40) |
2698                                 (value & ~0x7f);
2699                spin_unlock_irqrestore(&ohci->lock, flags);
2700                break;
2701
2702        case CSR_BUSY_TIMEOUT:
2703                value = (value & 0xf) | ((value & 0xf) << 4) |
2704                        ((value & 0xf) << 8) | ((value & 0x0ffff000) << 4);
2705                reg_write(ohci, OHCI1394_ATRetries, value);
2706                flush_writes(ohci);
2707                break;
2708
2709        case CSR_PRIORITY_BUDGET:
2710                reg_write(ohci, OHCI1394_FairnessControl, value & 0x3f);
2711                flush_writes(ohci);
2712                break;
2713
2714        default:
2715                WARN_ON(1);
2716                break;
2717        }
2718}
2719
2720static void flush_iso_completions(struct iso_context *ctx)
2721{
2722        ctx->base.callback.sc(&ctx->base, ctx->last_timestamp,
2723                              ctx->header_length, ctx->header,
2724                              ctx->base.callback_data);
2725        ctx->header_length = 0;
2726}
2727
2728static void copy_iso_headers(struct iso_context *ctx, const u32 *dma_hdr)
2729{
2730        u32 *ctx_hdr;
2731
2732        if (ctx->header_length + ctx->base.header_size > PAGE_SIZE)
2733                flush_iso_completions(ctx);
2734
2735        ctx_hdr = ctx->header + ctx->header_length;
2736        ctx->last_timestamp = (u16)le32_to_cpu((__force __le32)dma_hdr[0]);
2737
2738        /*
2739         * The two iso header quadlets are byteswapped to little
2740         * endian by the controller, but we want to present them
2741         * as big endian for consistency with the bus endianness.
2742         */
2743        if (ctx->base.header_size > 0)
2744                ctx_hdr[0] = swab32(dma_hdr[1]); /* iso packet header */
2745        if (ctx->base.header_size > 4)
2746                ctx_hdr[1] = swab32(dma_hdr[0]); /* timestamp */
2747        if (ctx->base.header_size > 8)
2748                memcpy(&ctx_hdr[2], &dma_hdr[2], ctx->base.header_size - 8);
2749        ctx->header_length += ctx->base.header_size;
2750}
2751
2752static int handle_ir_packet_per_buffer(struct context *context,
2753                                       struct descriptor *d,
2754                                       struct descriptor *last)
2755{
2756        struct iso_context *ctx =
2757                container_of(context, struct iso_context, context);
2758        struct descriptor *pd;
2759        u32 buffer_dma;
2760
2761        for (pd = d; pd <= last; pd++)
2762                if (pd->transfer_status)
2763                        break;
2764        if (pd > last)
2765                /* Descriptor(s) not done yet, stop iteration */
2766                return 0;
2767
2768        while (!(d->control & cpu_to_le16(DESCRIPTOR_BRANCH_ALWAYS))) {
2769                d++;
2770                buffer_dma = le32_to_cpu(d->data_address);
2771                dma_sync_single_range_for_cpu(context->ohci->card.device,
2772                                              buffer_dma & PAGE_MASK,
2773                                              buffer_dma & ~PAGE_MASK,
2774                                              le16_to_cpu(d->req_count),
2775                                              DMA_FROM_DEVICE);
2776        }
2777
2778        copy_iso_headers(ctx, (u32 *) (last + 1));
2779
2780        if (last->control & cpu_to_le16(DESCRIPTOR_IRQ_ALWAYS))
2781                flush_iso_completions(ctx);
2782
2783        return 1;
2784}
2785
2786/* d == last because each descriptor block is only a single descriptor. */
2787static int handle_ir_buffer_fill(struct context *context,
2788                                 struct descriptor *d,
2789                                 struct descriptor *last)
2790{
2791        struct iso_context *ctx =
2792                container_of(context, struct iso_context, context);
2793        unsigned int req_count, res_count, completed;
2794        u32 buffer_dma;
2795
2796        req_count = le16_to_cpu(last->req_count);
2797        res_count = le16_to_cpu(ACCESS_ONCE(last->res_count));
2798        completed = req_count - res_count;
2799        buffer_dma = le32_to_cpu(last->data_address);
2800
2801        if (completed > 0) {
2802                ctx->mc_buffer_bus = buffer_dma;
2803                ctx->mc_completed = completed;
2804        }
2805
2806        if (res_count != 0)
2807                /* Descriptor(s) not done yet, stop iteration */
2808                return 0;
2809
2810        dma_sync_single_range_for_cpu(context->ohci->card.device,
2811                                      buffer_dma & PAGE_MASK,
2812                                      buffer_dma & ~PAGE_MASK,
2813                                      completed, DMA_FROM_DEVICE);
2814
2815        if (last->control & cpu_to_le16(DESCRIPTOR_IRQ_ALWAYS)) {
2816                ctx->base.callback.mc(&ctx->base,
2817                                      buffer_dma + completed,
2818                                      ctx->base.callback_data);
2819                ctx->mc_completed = 0;
2820        }
2821
2822        return 1;
2823}
2824
2825static void flush_ir_buffer_fill(struct iso_context *ctx)
2826{
2827        dma_sync_single_range_for_cpu(ctx->context.ohci->card.device,
2828                                      ctx->mc_buffer_bus & PAGE_MASK,
2829                                      ctx->mc_buffer_bus & ~PAGE_MASK,
2830                                      ctx->mc_completed, DMA_FROM_DEVICE);
2831
2832        ctx->base.callback.mc(&ctx->base,
2833                              ctx->mc_buffer_bus + ctx->mc_completed,
2834                              ctx->base.callback_data);
2835        ctx->mc_completed = 0;
2836}
2837
2838static inline void sync_it_packet_for_cpu(struct context *context,
2839                                          struct descriptor *pd)
2840{
2841        __le16 control;
2842        u32 buffer_dma;
2843
2844        /* only packets beginning with OUTPUT_MORE* have data buffers */
2845        if (pd->control & cpu_to_le16(DESCRIPTOR_BRANCH_ALWAYS))
2846                return;
2847
2848        /* skip over the OUTPUT_MORE_IMMEDIATE descriptor */
2849        pd += 2;
2850
2851        /*
2852         * If the packet has a header, the first OUTPUT_MORE/LAST descriptor's
2853         * data buffer is in the context program's coherent page and must not
2854         * be synced.
2855         */
2856        if ((le32_to_cpu(pd->data_address) & PAGE_MASK) ==
2857            (context->current_bus          & PAGE_MASK)) {
2858                if (pd->control & cpu_to_le16(DESCRIPTOR_BRANCH_ALWAYS))
2859                        return;
2860                pd++;
2861        }
2862
2863        do {
2864                buffer_dma = le32_to_cpu(pd->data_address);
2865                dma_sync_single_range_for_cpu(context->ohci->card.device,
2866                                              buffer_dma & PAGE_MASK,
2867                                              buffer_dma & ~PAGE_MASK,
2868                                              le16_to_cpu(pd->req_count),
2869                                              DMA_TO_DEVICE);
2870                control = pd->control;
2871                pd++;
2872        } while (!(control & cpu_to_le16(DESCRIPTOR_BRANCH_ALWAYS)));
2873}
2874
2875static int handle_it_packet(struct context *context,
2876                            struct descriptor *d,
2877                            struct descriptor *last)
2878{
2879        struct iso_context *ctx =
2880                container_of(context, struct iso_context, context);
2881        struct descriptor *pd;
2882        __be32 *ctx_hdr;
2883
2884        for (pd = d; pd <= last; pd++)
2885                if (pd->transfer_status)
2886                        break;
2887        if (pd > last)
2888                /* Descriptor(s) not done yet, stop iteration */
2889                return 0;
2890
2891        sync_it_packet_for_cpu(context, d);
2892
2893        if (ctx->header_length + 4 > PAGE_SIZE)
2894                flush_iso_completions(ctx);
2895
2896        ctx_hdr = ctx->header + ctx->header_length;
2897        ctx->last_timestamp = le16_to_cpu(last->res_count);
2898        /* Present this value as big-endian to match the receive code */
2899        *ctx_hdr = cpu_to_be32((le16_to_cpu(pd->transfer_status) << 16) |
2900                               le16_to_cpu(pd->res_count));
2901        ctx->header_length += 4;
2902
2903        if (last->control & cpu_to_le16(DESCRIPTOR_IRQ_ALWAYS))
2904                flush_iso_completions(ctx);
2905
2906        return 1;
2907}
2908
2909static void set_multichannel_mask(struct fw_ohci *ohci, u64 channels)
2910{
2911        u32 hi = channels >> 32, lo = channels;
2912
2913        reg_write(ohci, OHCI1394_IRMultiChanMaskHiClear, ~hi);
2914        reg_write(ohci, OHCI1394_IRMultiChanMaskLoClear, ~lo);
2915        reg_write(ohci, OHCI1394_IRMultiChanMaskHiSet, hi);
2916        reg_write(ohci, OHCI1394_IRMultiChanMaskLoSet, lo);
2917        mmiowb();
2918        ohci->mc_channels = channels;
2919}
2920
2921static struct fw_iso_context *ohci_allocate_iso_context(struct fw_card *card,
2922                                int type, int channel, size_t header_size)
2923{
2924        struct fw_ohci *ohci = fw_ohci(card);
2925        struct iso_context *uninitialized_var(ctx);
2926        descriptor_callback_t uninitialized_var(callback);
2927        u64 *uninitialized_var(channels);
2928        u32 *uninitialized_var(mask), uninitialized_var(regs);
2929        int index, ret = -EBUSY;
2930
2931        spin_lock_irq(&ohci->lock);
2932
2933        switch (type) {
2934        case FW_ISO_CONTEXT_TRANSMIT:
2935                mask     = &ohci->it_context_mask;
2936                callback = handle_it_packet;
2937                index    = ffs(*mask) - 1;
2938                if (index >= 0) {
2939                        *mask &= ~(1 << index);
2940                        regs = OHCI1394_IsoXmitContextBase(index);
2941                        ctx  = &ohci->it_context_list[index];
2942                }
2943                break;
2944
2945        case FW_ISO_CONTEXT_RECEIVE:
2946                channels = &ohci->ir_context_channels;
2947                mask     = &ohci->ir_context_mask;
2948                callback = handle_ir_packet_per_buffer;
2949                index    = *channels & 1ULL << channel ? ffs(*mask) - 1 : -1;
2950                if (index >= 0) {
2951                        *channels &= ~(1ULL << channel);
2952                        *mask     &= ~(1 << index);
2953                        regs = OHCI1394_IsoRcvContextBase(index);
2954                        ctx  = &ohci->ir_context_list[index];
2955                }
2956                break;
2957
2958        case FW_ISO_CONTEXT_RECEIVE_MULTICHANNEL:
2959                mask     = &ohci->ir_context_mask;
2960                callback = handle_ir_buffer_fill;
2961                index    = !ohci->mc_allocated ? ffs(*mask) - 1 : -1;
2962                if (index >= 0) {
2963                        ohci->mc_allocated = true;
2964                        *mask &= ~(1 << index);
2965                        regs = OHCI1394_IsoRcvContextBase(index);
2966                        ctx  = &ohci->ir_context_list[index];
2967                }
2968                break;
2969
2970        default:
2971                index = -1;
2972                ret = -ENOSYS;
2973        }
2974
2975        spin_unlock_irq(&ohci->lock);
2976
2977        if (index < 0)
2978                return ERR_PTR(ret);
2979
2980        memset(ctx, 0, sizeof(*ctx));
2981        ctx->header_length = 0;
2982        ctx->header = (void *) __get_free_page(GFP_KERNEL);
2983        if (ctx->header == NULL) {
2984                ret = -ENOMEM;
2985                goto out;
2986        }
2987        ret = context_init(&ctx->context, ohci, regs, callback);
2988        if (ret < 0)
2989                goto out_with_header;
2990
2991        if (type == FW_ISO_CONTEXT_RECEIVE_MULTICHANNEL) {
2992                set_multichannel_mask(ohci, 0);
2993                ctx->mc_completed = 0;
2994        }
2995
2996        return &ctx->base;
2997
2998 out_with_header:
2999        free_page((unsigned long)ctx->header);
3000 out:
3001        spin_lock_irq(&ohci->lock);
3002
3003        switch (type) {
3004        case FW_ISO_CONTEXT_RECEIVE:
3005                *channels |= 1ULL << channel;
3006                break;
3007
3008        case FW_ISO_CONTEXT_RECEIVE_MULTICHANNEL:
3009                ohci->mc_allocated = false;
3010                break;
3011        }
3012        *mask |= 1 << index;
3013
3014        spin_unlock_irq(&ohci->lock);
3015
3016        return ERR_PTR(ret);
3017}
3018
3019static int ohci_start_iso(struct fw_iso_context *base,
3020                          s32 cycle, u32 sync, u32 tags)
3021{
3022        struct iso_context *ctx = container_of(base, struct iso_context, base);
3023        struct fw_ohci *ohci = ctx->context.ohci;
3024        u32 control = IR_CONTEXT_ISOCH_HEADER, match;
3025        int index;
3026
3027        /* the controller cannot start without any queued packets */
3028        if (ctx->context.last->branch_address == 0)
3029                return -ENODATA;
3030
3031        switch (ctx->base.type) {
3032        case FW_ISO_CONTEXT_TRANSMIT:
3033                index = ctx - ohci->it_context_list;
3034                match = 0;
3035                if (cycle >= 0)
3036                        match = IT_CONTEXT_CYCLE_MATCH_ENABLE |
3037                                (cycle & 0x7fff) << 16;
3038
3039                reg_write(ohci, OHCI1394_IsoXmitIntEventClear, 1 << index);
3040                reg_write(ohci, OHCI1394_IsoXmitIntMaskSet, 1 << index);
3041                context_run(&ctx->context, match);
3042                break;
3043
3044        case FW_ISO_CONTEXT_RECEIVE_MULTICHANNEL:
3045                control |= IR_CONTEXT_BUFFER_FILL|IR_CONTEXT_MULTI_CHANNEL_MODE;
3046                /* fall through */
3047        case FW_ISO_CONTEXT_RECEIVE:
3048                index = ctx - ohci->ir_context_list;
3049                match = (tags << 28) | (sync << 8) | ctx->base.channel;
3050                if (cycle >= 0) {
3051                        match |= (cycle & 0x07fff) << 12;
3052                        control |= IR_CONTEXT_CYCLE_MATCH_ENABLE;
3053                }
3054
3055                reg_write(ohci, OHCI1394_IsoRecvIntEventClear, 1 << index);
3056                reg_write(ohci, OHCI1394_IsoRecvIntMaskSet, 1 << index);
3057                reg_write(ohci, CONTEXT_MATCH(ctx->context.regs), match);
3058                context_run(&ctx->context, control);
3059
3060                ctx->sync = sync;
3061                ctx->tags = tags;
3062
3063                break;
3064        }
3065
3066        return 0;
3067}
3068
3069static int ohci_stop_iso(struct fw_iso_context *base)
3070{
3071        struct fw_ohci *ohci = fw_ohci(base->card);
3072        struct iso_context *ctx = container_of(base, struct iso_context, base);
3073        int index;
3074
3075        switch (ctx->base.type) {
3076        case FW_ISO_CONTEXT_TRANSMIT:
3077                index = ctx - ohci->it_context_list;
3078                reg_write(ohci, OHCI1394_IsoXmitIntMaskClear, 1 << index);
3079                break;
3080
3081        case FW_ISO_CONTEXT_RECEIVE:
3082        case FW_ISO_CONTEXT_RECEIVE_MULTICHANNEL:
3083                index = ctx - ohci->ir_context_list;
3084                reg_write(ohci, OHCI1394_IsoRecvIntMaskClear, 1 << index);
3085                break;
3086        }
3087        flush_writes(ohci);
3088        context_stop(&ctx->context);
3089        tasklet_kill(&ctx->context.tasklet);
3090
3091        return 0;
3092}
3093
3094static void ohci_free_iso_context(struct fw_iso_context *base)
3095{
3096        struct fw_ohci *ohci = fw_ohci(base->card);
3097        struct iso_context *ctx = container_of(base, struct iso_context, base);
3098        unsigned long flags;
3099        int index;
3100
3101        ohci_stop_iso(base);
3102        context_release(&ctx->context);
3103        free_page((unsigned long)ctx->header);
3104
3105        spin_lock_irqsave(&ohci->lock, flags);
3106
3107        switch (base->type) {
3108        case FW_ISO_CONTEXT_TRANSMIT:
3109                index = ctx - ohci->it_context_list;
3110                ohci->it_context_mask |= 1 << index;
3111                break;
3112
3113        case FW_ISO_CONTEXT_RECEIVE:
3114                index = ctx - ohci->ir_context_list;
3115                ohci->ir_context_mask |= 1 << index;
3116                ohci->ir_context_channels |= 1ULL << base->channel;
3117                break;
3118
3119        case FW_ISO_CONTEXT_RECEIVE_MULTICHANNEL:
3120                index = ctx - ohci->ir_context_list;
3121                ohci->ir_context_mask |= 1 << index;
3122                ohci->ir_context_channels |= ohci->mc_channels;
3123                ohci->mc_channels = 0;
3124                ohci->mc_allocated = false;
3125                break;
3126        }
3127
3128        spin_unlock_irqrestore(&ohci->lock, flags);
3129}
3130
3131static int ohci_set_iso_channels(struct fw_iso_context *base, u64 *channels)
3132{
3133        struct fw_ohci *ohci = fw_ohci(base->card);
3134        unsigned long flags;
3135        int ret;
3136
3137        switch (base->type) {
3138        case FW_ISO_CONTEXT_RECEIVE_MULTICHANNEL:
3139
3140                spin_lock_irqsave(&ohci->lock, flags);
3141
3142                /* Don't allow multichannel to grab other contexts' channels. */
3143                if (~ohci->ir_context_channels & ~ohci->mc_channels & *channels) {
3144                        *channels = ohci->ir_context_channels;
3145                        ret = -EBUSY;
3146                } else {
3147                        set_multichannel_mask(ohci, *channels);
3148                        ret = 0;
3149                }
3150
3151                spin_unlock_irqrestore(&ohci->lock, flags);
3152
3153                break;
3154        default:
3155                ret = -EINVAL;
3156        }
3157
3158        return ret;
3159}
3160
3161#ifdef CONFIG_PM
3162static void ohci_resume_iso_dma(struct fw_ohci *ohci)
3163{
3164        int i;
3165        struct iso_context *ctx;
3166
3167        for (i = 0 ; i < ohci->n_ir ; i++) {
3168                ctx = &ohci->ir_context_list[i];
3169                if (ctx->context.running)
3170                        ohci_start_iso(&ctx->base, 0, ctx->sync, ctx->tags);
3171        }
3172
3173        for (i = 0 ; i < ohci->n_it ; i++) {
3174                ctx = &ohci->it_context_list[i];
3175                if (ctx->context.running)
3176                        ohci_start_iso(&ctx->base, 0, ctx->sync, ctx->tags);
3177        }
3178}
3179#endif
3180
3181static int queue_iso_transmit(struct iso_context *ctx,
3182                              struct fw_iso_packet *packet,
3183                              struct fw_iso_buffer *buffer,
3184                              unsigned long payload)
3185{
3186        struct descriptor *d, *last, *pd;
3187        struct fw_iso_packet *p;
3188        __le32 *header;
3189        dma_addr_t d_bus, page_bus;
3190        u32 z, header_z, payload_z, irq;
3191        u32 payload_index, payload_end_index, next_page_index;
3192        int page, end_page, i, length, offset;
3193
3194        p = packet;
3195        payload_index = payload;
3196
3197        if (p->skip)
3198                z = 1;
3199        else
3200                z = 2;
3201        if (p->header_length > 0)
3202                z++;
3203
3204        /* Determine the first page the payload isn't contained in. */
3205        end_page = PAGE_ALIGN(payload_index + p->payload_length) >> PAGE_SHIFT;
3206        if (p->payload_length > 0)
3207                payload_z = end_page - (payload_index >> PAGE_SHIFT);
3208        else
3209                payload_z = 0;
3210
3211        z += payload_z;
3212
3213        /* Get header size in number of descriptors. */
3214        header_z = DIV_ROUND_UP(p->header_length, sizeof(*d));
3215
3216        d = context_get_descriptors(&ctx->context, z + header_z, &d_bus);
3217        if (d == NULL)
3218                return -ENOMEM;
3219
3220        if (!p->skip) {
3221                d[0].control   = cpu_to_le16(DESCRIPTOR_KEY_IMMEDIATE);
3222                d[0].req_count = cpu_to_le16(8);
3223                /*
3224                 * Link the skip address to this descriptor itself.  This causes
3225                 * a context to skip a cycle whenever lost cycles or FIFO
3226                 * overruns occur, without dropping the data.  The application
3227                 * should then decide whether this is an error condition or not.
3228                 * FIXME:  Make the context's cycle-lost behaviour configurable?
3229                 */
3230                d[0].branch_address = cpu_to_le32(d_bus | z);
3231
3232                header = (__le32 *) &d[1];
3233                header[0] = cpu_to_le32(IT_HEADER_SY(p->sy) |
3234                                        IT_HEADER_TAG(p->tag) |
3235                                        IT_HEADER_TCODE(TCODE_STREAM_DATA) |
3236                                        IT_HEADER_CHANNEL(ctx->base.channel) |
3237                                        IT_HEADER_SPEED(ctx->base.speed));
3238                header[1] =
3239                        cpu_to_le32(IT_HEADER_DATA_LENGTH(p->header_length +
3240                                                          p->payload_length));
3241        }
3242
3243        if (p->header_length > 0) {
3244                d[2].req_count    = cpu_to_le16(p->header_length);
3245                d[2].data_address = cpu_to_le32(d_bus + z * sizeof(*d));
3246                memcpy(&d[z], p->header, p->header_length);
3247        }
3248
3249        pd = d + z - payload_z;
3250        payload_end_index = payload_index + p->payload_length;
3251        for (i = 0; i < payload_z; i++) {
3252                page               = payload_index >> PAGE_SHIFT;
3253                offset             = payload_index & ~PAGE_MASK;
3254                next_page_index    = (page + 1) << PAGE_SHIFT;
3255                length             =
3256                        min(next_page_index, payload_end_index) - payload_index;
3257                pd[i].req_count    = cpu_to_le16(length);
3258
3259                page_bus = page_private(buffer->pages[page]);
3260                pd[i].data_address = cpu_to_le32(page_bus + offset);
3261
3262                dma_sync_single_range_for_device(ctx->context.ohci->card.device,
3263                                                 page_bus, offset, length,
3264                                                 DMA_TO_DEVICE);
3265
3266                payload_index += length;
3267        }
3268
3269        if (p->interrupt)
3270                irq = DESCRIPTOR_IRQ_ALWAYS;
3271        else
3272                irq = DESCRIPTOR_NO_IRQ;
3273
3274        last = z == 2 ? d : d + z - 1;
3275        last->control |= cpu_to_le16(DESCRIPTOR_OUTPUT_LAST |
3276                                     DESCRIPTOR_STATUS |
3277                                     DESCRIPTOR_BRANCH_ALWAYS |
3278                                     irq);
3279
3280        context_append(&ctx->context, d, z, header_z);
3281
3282        return 0;
3283}
3284
3285static int queue_iso_packet_per_buffer(struct iso_context *ctx,
3286                                       struct fw_iso_packet *packet,
3287                                       struct fw_iso_buffer *buffer,
3288                                       unsigned long payload)
3289{
3290        struct device *device = ctx->context.ohci->card.device;
3291        struct descriptor *d, *pd;
3292        dma_addr_t d_bus, page_bus;
3293        u32 z, header_z, rest;
3294        int i, j, length;
3295        int page, offset, packet_count, header_size, payload_per_buffer;
3296
3297        /*
3298         * The OHCI controller puts the isochronous header and trailer in the
3299         * buffer, so we need at least 8 bytes.
3300         */
3301        packet_count = packet->header_length / ctx->base.header_size;
3302        header_size  = max(ctx->base.header_size, (size_t)8);
3303
3304        /* Get header size in number of descriptors. */
3305        header_z = DIV_ROUND_UP(header_size, sizeof(*d));
3306        page     = payload >> PAGE_SHIFT;
3307        offset   = payload & ~PAGE_MASK;
3308        payload_per_buffer = packet->payload_length / packet_count;
3309
3310        for (i = 0; i < packet_count; i++) {
3311                /* d points to the header descriptor */
3312                z = DIV_ROUND_UP(payload_per_buffer + offset, PAGE_SIZE) + 1;
3313                d = context_get_descriptors(&ctx->context,
3314                                z + header_z, &d_bus);
3315                if (d == NULL)
3316                        return -ENOMEM;
3317
3318                d->control      = cpu_to_le16(DESCRIPTOR_STATUS |
3319                                              DESCRIPTOR_INPUT_MORE);
3320                if (packet->skip && i == 0)
3321                        d->control |= cpu_to_le16(DESCRIPTOR_WAIT);
3322                d->req_count    = cpu_to_le16(header_size);
3323                d->res_count    = d->req_count;
3324                d->transfer_status = 0;
3325                d->data_address = cpu_to_le32(d_bus + (z * sizeof(*d)));
3326
3327                rest = payload_per_buffer;
3328                pd = d;
3329                for (j = 1; j < z; j++) {
3330                        pd++;
3331                        pd->control = cpu_to_le16(DESCRIPTOR_STATUS |
3332                                                  DESCRIPTOR_INPUT_MORE);
3333
3334                        if (offset + rest < PAGE_SIZE)
3335                                length = rest;
3336                        else
3337                                length = PAGE_SIZE - offset;
3338                        pd->req_count = cpu_to_le16(length);
3339                        pd->res_count = pd->req_count;
3340                        pd->transfer_status = 0;
3341
3342                        page_bus = page_private(buffer->pages[page]);
3343                        pd->data_address = cpu_to_le32(page_bus + offset);
3344
3345                        dma_sync_single_range_for_device(device, page_bus,
3346                                                         offset, length,
3347                                                         DMA_FROM_DEVICE);
3348
3349                        offset = (offset + length) & ~PAGE_MASK;
3350                        rest -= length;
3351                        if (offset == 0)
3352                                page++;
3353                }
3354                pd->control = cpu_to_le16(DESCRIPTOR_STATUS |
3355                                          DESCRIPTOR_INPUT_LAST |
3356                                          DESCRIPTOR_BRANCH_ALWAYS);
3357                if (packet->interrupt && i == packet_count - 1)
3358                        pd->control |= cpu_to_le16(DESCRIPTOR_IRQ_ALWAYS);
3359
3360                context_append(&ctx->context, d, z, header_z);
3361        }
3362
3363        return 0;
3364}
3365
3366static int queue_iso_buffer_fill(struct iso_context *ctx,
3367                                 struct fw_iso_packet *packet,
3368                                 struct fw_iso_buffer *buffer,
3369                                 unsigned long payload)
3370{
3371        struct descriptor *d;
3372        dma_addr_t d_bus, page_bus;
3373        int page, offset, rest, z, i, length;
3374
3375        page   = payload >> PAGE_SHIFT;
3376        offset = payload & ~PAGE_MASK;
3377        rest   = packet->payload_length;
3378
3379        /* We need one descriptor for each page in the buffer. */
3380        z = DIV_ROUND_UP(offset + rest, PAGE_SIZE);
3381
3382        if (WARN_ON(offset & 3 || rest & 3 || page + z > buffer->page_count))
3383                return -EFAULT;
3384
3385        for (i = 0; i < z; i++) {
3386                d = context_get_descriptors(&ctx->context, 1, &d_bus);
3387                if (d == NULL)
3388                        return -ENOMEM;
3389
3390                d->control = cpu_to_le16(DESCRIPTOR_INPUT_MORE |
3391                                         DESCRIPTOR_BRANCH_ALWAYS);
3392                if (packet->skip && i == 0)
3393                        d->control |= cpu_to_le16(DESCRIPTOR_WAIT);
3394                if (packet->interrupt && i == z - 1)
3395                        d->control |= cpu_to_le16(DESCRIPTOR_IRQ_ALWAYS);
3396
3397                if (offset + rest < PAGE_SIZE)
3398                        length = rest;
3399                else
3400                        length = PAGE_SIZE - offset;
3401                d->req_count = cpu_to_le16(length);
3402                d->res_count = d->req_count;
3403                d->transfer_status = 0;
3404
3405                page_bus = page_private(buffer->pages[page]);
3406                d->data_address = cpu_to_le32(page_bus + offset);
3407
3408                dma_sync_single_range_for_device(ctx->context.ohci->card.device,
3409                                                 page_bus, offset, length,
3410                                                 DMA_FROM_DEVICE);
3411
3412                rest -= length;
3413                offset = 0;
3414                page++;
3415
3416                context_append(&ctx->context, d, 1, 0);
3417        }
3418
3419        return 0;
3420}
3421
3422static int ohci_queue_iso(struct fw_iso_context *base,
3423                          struct fw_iso_packet *packet,
3424                          struct fw_iso_buffer *buffer,
3425                          unsigned long payload)
3426{
3427        struct iso_context *ctx = container_of(base, struct iso_context, base);
3428        unsigned long flags;
3429        int ret = -ENOSYS;
3430
3431        spin_lock_irqsave(&ctx->context.ohci->lock, flags);
3432        switch (base->type) {
3433        case FW_ISO_CONTEXT_TRANSMIT:
3434                ret = queue_iso_transmit(ctx, packet, buffer, payload);
3435                break;
3436        case FW_ISO_CONTEXT_RECEIVE:
3437                ret = queue_iso_packet_per_buffer(ctx, packet, buffer, payload);
3438                break;
3439        case FW_ISO_CONTEXT_RECEIVE_MULTICHANNEL:
3440                ret = queue_iso_buffer_fill(ctx, packet, buffer, payload);
3441                break;
3442        }
3443        spin_unlock_irqrestore(&ctx->context.ohci->lock, flags);
3444
3445        return ret;
3446}
3447
3448static void ohci_flush_queue_iso(struct fw_iso_context *base)
3449{
3450        struct context *ctx =
3451                        &container_of(base, struct iso_context, base)->context;
3452
3453        reg_write(ctx->ohci, CONTROL_SET(ctx->regs), CONTEXT_WAKE);
3454}
3455
3456static int ohci_flush_iso_completions(struct fw_iso_context *base)
3457{
3458        struct iso_context *ctx = container_of(base, struct iso_context, base);
3459        int ret = 0;
3460
3461        tasklet_disable(&ctx->context.tasklet);
3462
3463        if (!test_and_set_bit_lock(0, &ctx->flushing_completions)) {
3464                context_tasklet((unsigned long)&ctx->context);
3465
3466                switch (base->type) {
3467                case FW_ISO_CONTEXT_TRANSMIT:
3468                case FW_ISO_CONTEXT_RECEIVE:
3469                        if (ctx->header_length != 0)
3470                                flush_iso_completions(ctx);
3471                        break;
3472                case FW_ISO_CONTEXT_RECEIVE_MULTICHANNEL:
3473                        if (ctx->mc_completed != 0)
3474                                flush_ir_buffer_fill(ctx);
3475                        break;
3476                default:
3477                        ret = -ENOSYS;
3478                }
3479
3480                clear_bit_unlock(0, &ctx->flushing_completions);
3481                smp_mb__after_clear_bit();
3482        }
3483
3484        tasklet_enable(&ctx->context.tasklet);
3485
3486        return ret;
3487}
3488
3489static const struct fw_card_driver ohci_driver = {
3490        .enable                 = ohci_enable,
3491        .read_phy_reg           = ohci_read_phy_reg,
3492        .update_phy_reg         = ohci_update_phy_reg,
3493        .set_config_rom         = ohci_set_config_rom,
3494        .send_request           = ohci_send_request,
3495        .send_response          = ohci_send_response,
3496        .cancel_packet          = ohci_cancel_packet,
3497        .enable_phys_dma        = ohci_enable_phys_dma,
3498        .read_csr               = ohci_read_csr,
3499        .write_csr              = ohci_write_csr,
3500
3501        .allocate_iso_context   = ohci_allocate_iso_context,
3502        .free_iso_context       = ohci_free_iso_context,
3503        .set_iso_channels       = ohci_set_iso_channels,
3504        .queue_iso              = ohci_queue_iso,
3505        .flush_queue_iso        = ohci_flush_queue_iso,
3506        .flush_iso_completions  = ohci_flush_iso_completions,
3507        .start_iso              = ohci_start_iso,
3508        .stop_iso               = ohci_stop_iso,
3509};
3510
3511#ifdef CONFIG_PPC_PMAC
3512static void pmac_ohci_on(struct pci_dev *dev)
3513{
3514        if (machine_is(powermac)) {
3515                struct device_node *ofn = pci_device_to_OF_node(dev);
3516
3517                if (ofn) {
3518                        pmac_call_feature(PMAC_FTR_1394_CABLE_POWER, ofn, 0, 1);
3519                        pmac_call_feature(PMAC_FTR_1394_ENABLE, ofn, 0, 1);
3520                }
3521        }
3522}
3523
3524static void pmac_ohci_off(struct pci_dev *dev)
3525{
3526        if (machine_is(powermac)) {
3527                struct device_node *ofn = pci_device_to_OF_node(dev);
3528
3529                if (ofn) {
3530                        pmac_call_feature(PMAC_FTR_1394_ENABLE, ofn, 0, 0);
3531                        pmac_call_feature(PMAC_FTR_1394_CABLE_POWER, ofn, 0, 0);
3532                }
3533        }
3534}
3535#else
3536static inline void pmac_ohci_on(struct pci_dev *dev) {}
3537static inline void pmac_ohci_off(struct pci_dev *dev) {}
3538#endif /* CONFIG_PPC_PMAC */
3539
3540static int __devinit pci_probe(struct pci_dev *dev,
3541                               const struct pci_device_id *ent)
3542{
3543        struct fw_ohci *ohci;
3544        u32 bus_options, max_receive, link_speed, version;
3545        u64 guid;
3546        int i, err;
3547        size_t size;
3548
3549        if (dev->vendor == PCI_VENDOR_ID_PINNACLE_SYSTEMS) {
3550                dev_err(&dev->dev, "Pinnacle MovieBoard is not yet supported\n");
3551                return -ENOSYS;
3552        }
3553
3554        ohci = kzalloc(sizeof(*ohci), GFP_KERNEL);
3555        if (ohci == NULL) {
3556                err = -ENOMEM;
3557                goto fail;
3558        }
3559
3560        fw_card_initialize(&ohci->card, &ohci_driver, &dev->dev);
3561
3562        pmac_ohci_on(dev);
3563
3564        err = pci_enable_device(dev);
3565        if (err) {
3566                dev_err(&dev->dev, "failed to enable OHCI hardware\n");
3567                goto fail_free;
3568        }
3569
3570        pci_set_master(dev);
3571        pci_write_config_dword(dev, OHCI1394_PCI_HCI_Control, 0);
3572        pci_set_drvdata(dev, ohci);
3573
3574        spin_lock_init(&ohci->lock);
3575        mutex_init(&ohci->phy_reg_mutex);
3576
3577        INIT_WORK(&ohci->bus_reset_work, bus_reset_work);
3578
3579        if (!(pci_resource_flags(dev, 0) & IORESOURCE_MEM) ||
3580            pci_resource_len(dev, 0) < OHCI1394_REGISTER_SIZE) {
3581                dev_err(&dev->dev, "invalid MMIO resource\n");
3582                err = -ENXIO;
3583                goto fail_disable;
3584        }
3585
3586        err = pci_request_region(dev, 0, ohci_driver_name);
3587        if (err) {
3588                dev_err(&dev->dev, "MMIO resource unavailable\n");
3589                goto fail_disable;
3590        }
3591
3592        ohci->registers = pci_iomap(dev, 0, OHCI1394_REGISTER_SIZE);
3593        if (ohci->registers == NULL) {
3594                dev_err(&dev->dev, "failed to remap registers\n");
3595                err = -ENXIO;
3596                goto fail_iomem;
3597        }
3598
3599        for (i = 0; i < ARRAY_SIZE(ohci_quirks); i++)
3600                if ((ohci_quirks[i].vendor == dev->vendor) &&
3601                    (ohci_quirks[i].device == (unsigned short)PCI_ANY_ID ||
3602                     ohci_quirks[i].device == dev->device) &&
3603                    (ohci_quirks[i].revision == (unsigned short)PCI_ANY_ID ||
3604                     ohci_quirks[i].revision >= dev->revision)) {
3605                        ohci->quirks = ohci_quirks[i].flags;
3606                        break;
3607                }
3608        if (param_quirks)
3609                ohci->quirks = param_quirks;
3610
3611        /*
3612         * Because dma_alloc_coherent() allocates at least one page,
3613         * we save space by using a common buffer for the AR request/
3614         * response descriptors and the self IDs buffer.
3615         */
3616        BUILD_BUG_ON(AR_BUFFERS * sizeof(struct descriptor) > PAGE_SIZE/4);
3617        BUILD_BUG_ON(SELF_ID_BUF_SIZE > PAGE_SIZE/2);
3618        ohci->misc_buffer = dma_alloc_coherent(ohci->card.device,
3619                                               PAGE_SIZE,
3620                                               &ohci->misc_buffer_bus,
3621                                               GFP_KERNEL);
3622        if (!ohci->misc_buffer) {
3623                err = -ENOMEM;
3624                goto fail_iounmap;
3625        }
3626
3627        err = ar_context_init(&ohci->ar_request_ctx, ohci, 0,
3628                              OHCI1394_AsReqRcvContextControlSet);
3629        if (err < 0)
3630                goto fail_misc_buf;
3631
3632        err = ar_context_init(&ohci->ar_response_ctx, ohci, PAGE_SIZE/4,
3633                              OHCI1394_AsRspRcvContextControlSet);
3634        if (err < 0)
3635                goto fail_arreq_ctx;
3636
3637        err = context_init(&ohci->at_request_ctx, ohci,
3638                           OHCI1394_AsReqTrContextControlSet, handle_at_packet);
3639        if (err < 0)
3640                goto fail_arrsp_ctx;
3641
3642        err = context_init(&ohci->at_response_ctx, ohci,
3643                           OHCI1394_AsRspTrContextControlSet, handle_at_packet);
3644        if (err < 0)
3645                goto fail_atreq_ctx;
3646
3647        reg_write(ohci, OHCI1394_IsoRecvIntMaskSet, ~0);
3648        ohci->ir_context_channels = ~0ULL;
3649        ohci->ir_context_support = reg_read(ohci, OHCI1394_IsoRecvIntMaskSet);
3650        reg_write(ohci, OHCI1394_IsoRecvIntMaskClear, ~0);
3651        ohci->ir_context_mask = ohci->ir_context_support;
3652        ohci->n_ir = hweight32(ohci->ir_context_mask);
3653        size = sizeof(struct iso_context) * ohci->n_ir;
3654        ohci->ir_context_list = kzalloc(size, GFP_KERNEL);
3655
3656        reg_write(ohci, OHCI1394_IsoXmitIntMaskSet, ~0);
3657        ohci->it_context_support = reg_read(ohci, OHCI1394_IsoXmitIntMaskSet);
3658        reg_write(ohci, OHCI1394_IsoXmitIntMaskClear, ~0);
3659        ohci->it_context_mask = ohci->it_context_support;
3660        ohci->n_it = hweight32(ohci->it_context_mask);
3661        size = sizeof(struct iso_context) * ohci->n_it;
3662        ohci->it_context_list = kzalloc(size, GFP_KERNEL);
3663
3664        if (ohci->it_context_list == NULL || ohci->ir_context_list == NULL) {
3665                err = -ENOMEM;
3666                goto fail_contexts;
3667        }
3668
3669        ohci->self_id_cpu = ohci->misc_buffer     + PAGE_SIZE/2;
3670        ohci->self_id_bus = ohci->misc_buffer_bus + PAGE_SIZE/2;
3671
3672        bus_options = reg_read(ohci, OHCI1394_BusOptions);
3673        max_receive = (bus_options >> 12) & 0xf;
3674        link_speed = bus_options & 0x7;
3675        guid = ((u64) reg_read(ohci, OHCI1394_GUIDHi) << 32) |
3676                reg_read(ohci, OHCI1394_GUIDLo);
3677
3678        err = fw_card_add(&ohci->card, max_receive, link_speed, guid);
3679        if (err)
3680                goto fail_contexts;
3681
3682        version = reg_read(ohci, OHCI1394_Version) & 0x00ff00ff;
3683        dev_notice(&dev->dev,
3684                  "added OHCI v%x.%x device as card %d, "
3685                  "%d IR + %d IT contexts, quirks 0x%x\n",
3686                  version >> 16, version & 0xff, ohci->card.index,
3687                  ohci->n_ir, ohci->n_it, ohci->quirks);
3688
3689        return 0;
3690
3691 fail_contexts:
3692        kfree(ohci->ir_context_list);
3693        kfree(ohci->it_context_list);
3694        context_release(&ohci->at_response_ctx);
3695 fail_atreq_ctx:
3696        context_release(&ohci->at_request_ctx);
3697 fail_arrsp_ctx:
3698        ar_context_release(&ohci->ar_response_ctx);
3699 fail_arreq_ctx:
3700        ar_context_release(&ohci->ar_request_ctx);
3701 fail_misc_buf:
3702        dma_free_coherent(ohci->card.device, PAGE_SIZE,
3703                          ohci->misc_buffer, ohci->misc_buffer_bus);
3704 fail_iounmap:
3705        pci_iounmap(dev, ohci->registers);
3706 fail_iomem:
3707        pci_release_region(dev, 0);
3708 fail_disable:
3709        pci_disable_device(dev);
3710 fail_free:
3711        kfree(ohci);
3712        pmac_ohci_off(dev);
3713 fail:
3714        if (err == -ENOMEM)
3715                dev_err(&dev->dev, "out of memory\n");
3716
3717        return err;
3718}
3719
3720static void pci_remove(struct pci_dev *dev)
3721{
3722        struct fw_ohci *ohci;
3723
3724        ohci = pci_get_drvdata(dev);
3725        reg_write(ohci, OHCI1394_IntMaskClear, ~0);
3726        flush_writes(ohci);
3727        cancel_work_sync(&ohci->bus_reset_work);
3728        fw_core_remove_card(&ohci->card);
3729
3730        /*
3731         * FIXME: Fail all pending packets here, now that the upper
3732         * layers can't queue any more.
3733         */
3734
3735        software_reset(ohci);
3736        free_irq(dev->irq, ohci);
3737
3738        if (ohci->next_config_rom && ohci->next_config_rom != ohci->config_rom)
3739                dma_free_coherent(ohci->card.device, CONFIG_ROM_SIZE,
3740                                  ohci->next_config_rom, ohci->next_config_rom_bus);
3741        if (ohci->config_rom)
3742                dma_free_coherent(ohci->card.device, CONFIG_ROM_SIZE,
3743                                  ohci->config_rom, ohci->config_rom_bus);
3744        ar_context_release(&ohci->ar_request_ctx);
3745        ar_context_release(&ohci->ar_response_ctx);
3746        dma_free_coherent(ohci->card.device, PAGE_SIZE,
3747                          ohci->misc_buffer, ohci->misc_buffer_bus);
3748        context_release(&ohci->at_request_ctx);
3749        context_release(&ohci->at_response_ctx);
3750        kfree(ohci->it_context_list);
3751        kfree(ohci->ir_context_list);
3752        pci_disable_msi(dev);
3753        pci_iounmap(dev, ohci->registers);
3754        pci_release_region(dev, 0);
3755        pci_disable_device(dev);
3756        kfree(ohci);
3757        pmac_ohci_off(dev);
3758
3759        dev_notice(&dev->dev, "removed fw-ohci device\n");
3760}
3761
3762#ifdef CONFIG_PM
3763static int pci_suspend(struct pci_dev *dev, pm_message_t state)
3764{
3765        struct fw_ohci *ohci = pci_get_drvdata(dev);
3766        int err;
3767
3768        software_reset(ohci);
3769        free_irq(dev->irq, ohci);
3770        pci_disable_msi(dev);
3771        err = pci_save_state(dev);
3772        if (err) {
3773                dev_err(&dev->dev, "pci_save_state failed\n");
3774                return err;
3775        }
3776        err = pci_set_power_state(dev, pci_choose_state(dev, state));
3777        if (err)
3778                dev_err(&dev->dev, "pci_set_power_state failed with %d\n", err);
3779        pmac_ohci_off(dev);
3780
3781        return 0;
3782}
3783
3784static int pci_resume(struct pci_dev *dev)
3785{
3786        struct fw_ohci *ohci = pci_get_drvdata(dev);
3787        int err;
3788
3789        pmac_ohci_on(dev);
3790        pci_set_power_state(dev, PCI_D0);
3791        pci_restore_state(dev);
3792        err = pci_enable_device(dev);
3793        if (err) {
3794                dev_err(&dev->dev, "pci_enable_device failed\n");
3795                return err;
3796        }
3797
3798        /* Some systems don't setup GUID register on resume from ram  */
3799        if (!reg_read(ohci, OHCI1394_GUIDLo) &&
3800                                        !reg_read(ohci, OHCI1394_GUIDHi)) {
3801                reg_write(ohci, OHCI1394_GUIDLo, (u32)ohci->card.guid);
3802                reg_write(ohci, OHCI1394_GUIDHi, (u32)(ohci->card.guid >> 32));
3803        }
3804
3805        err = ohci_enable(&ohci->card, NULL, 0);
3806        if (err)
3807                return err;
3808
3809        ohci_resume_iso_dma(ohci);
3810
3811        return 0;
3812}
3813#endif
3814
3815static const struct pci_device_id pci_table[] = {
3816        { PCI_DEVICE_CLASS(PCI_CLASS_SERIAL_FIREWIRE_OHCI, ~0) },
3817        { }
3818};
3819
3820MODULE_DEVICE_TABLE(pci, pci_table);
3821
3822static struct pci_driver fw_ohci_pci_driver = {
3823        .name           = ohci_driver_name,
3824        .id_table       = pci_table,
3825        .probe          = pci_probe,
3826        .remove         = pci_remove,
3827#ifdef CONFIG_PM
3828        .resume         = pci_resume,
3829        .suspend        = pci_suspend,
3830#endif
3831};
3832
3833module_pci_driver(fw_ohci_pci_driver);
3834
3835MODULE_AUTHOR("Kristian Hoegsberg <krh@bitplanet.net>");
3836MODULE_DESCRIPTION("Driver for PCI OHCI IEEE1394 controllers");
3837MODULE_LICENSE("GPL");
3838
3839/* Provide a module alias so root-on-sbp2 initrds don't break. */
3840#ifndef CONFIG_IEEE1394_OHCI1394_MODULE
3841MODULE_ALIAS("ohci1394");
3842#endif
3843
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