linux/drivers/dma/mv_xor.c
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   1/*
   2 * offload engine driver for the Marvell XOR engine
   3 * Copyright (C) 2007, 2008, Marvell International Ltd.
   4 *
   5 * This program is free software; you can redistribute it and/or modify it
   6 * under the terms and conditions of the GNU General Public License,
   7 * version 2, as published by the Free Software Foundation.
   8 *
   9 * This program is distributed in the hope it will be useful, but WITHOUT
  10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  11 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
  12 * more details.
  13 *
  14 * You should have received a copy of the GNU General Public License along with
  15 * this program; if not, write to the Free Software Foundation, Inc.,
  16 * 51 Franklin St - Fifth Floor, Boston, MA 02110-1301 USA.
  17 */
  18
  19#include <linux/init.h>
  20#include <linux/module.h>
  21#include <linux/slab.h>
  22#include <linux/delay.h>
  23#include <linux/dma-mapping.h>
  24#include <linux/spinlock.h>
  25#include <linux/interrupt.h>
  26#include <linux/platform_device.h>
  27#include <linux/memory.h>
  28#include <linux/clk.h>
  29#include <linux/of.h>
  30#include <linux/of_irq.h>
  31#include <linux/irqdomain.h>
  32#include <linux/platform_data/dma-mv_xor.h>
  33
  34#include "dmaengine.h"
  35#include "mv_xor.h"
  36
  37static void mv_xor_issue_pending(struct dma_chan *chan);
  38
  39#define to_mv_xor_chan(chan)            \
  40        container_of(chan, struct mv_xor_chan, dmachan)
  41
  42#define to_mv_xor_slot(tx)              \
  43        container_of(tx, struct mv_xor_desc_slot, async_tx)
  44
  45#define mv_chan_to_devp(chan)           \
  46        ((chan)->dmadev.dev)
  47
  48static void mv_desc_init(struct mv_xor_desc_slot *desc, unsigned long flags)
  49{
  50        struct mv_xor_desc *hw_desc = desc->hw_desc;
  51
  52        hw_desc->status = (1 << 31);
  53        hw_desc->phy_next_desc = 0;
  54        hw_desc->desc_command = (1 << 31);
  55}
  56
  57static u32 mv_desc_get_dest_addr(struct mv_xor_desc_slot *desc)
  58{
  59        struct mv_xor_desc *hw_desc = desc->hw_desc;
  60        return hw_desc->phy_dest_addr;
  61}
  62
  63static u32 mv_desc_get_src_addr(struct mv_xor_desc_slot *desc,
  64                                int src_idx)
  65{
  66        struct mv_xor_desc *hw_desc = desc->hw_desc;
  67        return hw_desc->phy_src_addr[src_idx];
  68}
  69
  70
  71static void mv_desc_set_byte_count(struct mv_xor_desc_slot *desc,
  72                                   u32 byte_count)
  73{
  74        struct mv_xor_desc *hw_desc = desc->hw_desc;
  75        hw_desc->byte_count = byte_count;
  76}
  77
  78static void mv_desc_set_next_desc(struct mv_xor_desc_slot *desc,
  79                                  u32 next_desc_addr)
  80{
  81        struct mv_xor_desc *hw_desc = desc->hw_desc;
  82        BUG_ON(hw_desc->phy_next_desc);
  83        hw_desc->phy_next_desc = next_desc_addr;
  84}
  85
  86static void mv_desc_clear_next_desc(struct mv_xor_desc_slot *desc)
  87{
  88        struct mv_xor_desc *hw_desc = desc->hw_desc;
  89        hw_desc->phy_next_desc = 0;
  90}
  91
  92static void mv_desc_set_block_fill_val(struct mv_xor_desc_slot *desc, u32 val)
  93{
  94        desc->value = val;
  95}
  96
  97static void mv_desc_set_dest_addr(struct mv_xor_desc_slot *desc,
  98                                  dma_addr_t addr)
  99{
 100        struct mv_xor_desc *hw_desc = desc->hw_desc;
 101        hw_desc->phy_dest_addr = addr;
 102}
 103
 104static int mv_chan_memset_slot_count(size_t len)
 105{
 106        return 1;
 107}
 108
 109#define mv_chan_memcpy_slot_count(c) mv_chan_memset_slot_count(c)
 110
 111static void mv_desc_set_src_addr(struct mv_xor_desc_slot *desc,
 112                                 int index, dma_addr_t addr)
 113{
 114        struct mv_xor_desc *hw_desc = desc->hw_desc;
 115        hw_desc->phy_src_addr[index] = addr;
 116        if (desc->type == DMA_XOR)
 117                hw_desc->desc_command |= (1 << index);
 118}
 119
 120static u32 mv_chan_get_current_desc(struct mv_xor_chan *chan)
 121{
 122        return __raw_readl(XOR_CURR_DESC(chan));
 123}
 124
 125static void mv_chan_set_next_descriptor(struct mv_xor_chan *chan,
 126                                        u32 next_desc_addr)
 127{
 128        __raw_writel(next_desc_addr, XOR_NEXT_DESC(chan));
 129}
 130
 131static void mv_chan_set_dest_pointer(struct mv_xor_chan *chan, u32 desc_addr)
 132{
 133        __raw_writel(desc_addr, XOR_DEST_POINTER(chan));
 134}
 135
 136static void mv_chan_set_block_size(struct mv_xor_chan *chan, u32 block_size)
 137{
 138        __raw_writel(block_size, XOR_BLOCK_SIZE(chan));
 139}
 140
 141static void mv_chan_set_value(struct mv_xor_chan *chan, u32 value)
 142{
 143        __raw_writel(value, XOR_INIT_VALUE_LOW(chan));
 144        __raw_writel(value, XOR_INIT_VALUE_HIGH(chan));
 145}
 146
 147static void mv_chan_unmask_interrupts(struct mv_xor_chan *chan)
 148{
 149        u32 val = __raw_readl(XOR_INTR_MASK(chan));
 150        val |= XOR_INTR_MASK_VALUE << (chan->idx * 16);
 151        __raw_writel(val, XOR_INTR_MASK(chan));
 152}
 153
 154static u32 mv_chan_get_intr_cause(struct mv_xor_chan *chan)
 155{
 156        u32 intr_cause = __raw_readl(XOR_INTR_CAUSE(chan));
 157        intr_cause = (intr_cause >> (chan->idx * 16)) & 0xFFFF;
 158        return intr_cause;
 159}
 160
 161static int mv_is_err_intr(u32 intr_cause)
 162{
 163        if (intr_cause & ((1<<4)|(1<<5)|(1<<6)|(1<<7)|(1<<8)|(1<<9)))
 164                return 1;
 165
 166        return 0;
 167}
 168
 169static void mv_xor_device_clear_eoc_cause(struct mv_xor_chan *chan)
 170{
 171        u32 val = ~(1 << (chan->idx * 16));
 172        dev_dbg(mv_chan_to_devp(chan), "%s, val 0x%08x\n", __func__, val);
 173        __raw_writel(val, XOR_INTR_CAUSE(chan));
 174}
 175
 176static void mv_xor_device_clear_err_status(struct mv_xor_chan *chan)
 177{
 178        u32 val = 0xFFFF0000 >> (chan->idx * 16);
 179        __raw_writel(val, XOR_INTR_CAUSE(chan));
 180}
 181
 182static int mv_can_chain(struct mv_xor_desc_slot *desc)
 183{
 184        struct mv_xor_desc_slot *chain_old_tail = list_entry(
 185                desc->chain_node.prev, struct mv_xor_desc_slot, chain_node);
 186
 187        if (chain_old_tail->type != desc->type)
 188                return 0;
 189        if (desc->type == DMA_MEMSET)
 190                return 0;
 191
 192        return 1;
 193}
 194
 195static void mv_set_mode(struct mv_xor_chan *chan,
 196                               enum dma_transaction_type type)
 197{
 198        u32 op_mode;
 199        u32 config = __raw_readl(XOR_CONFIG(chan));
 200
 201        switch (type) {
 202        case DMA_XOR:
 203                op_mode = XOR_OPERATION_MODE_XOR;
 204                break;
 205        case DMA_MEMCPY:
 206                op_mode = XOR_OPERATION_MODE_MEMCPY;
 207                break;
 208        case DMA_MEMSET:
 209                op_mode = XOR_OPERATION_MODE_MEMSET;
 210                break;
 211        default:
 212                dev_err(mv_chan_to_devp(chan),
 213                        "error: unsupported operation %d.\n",
 214                        type);
 215                BUG();
 216                return;
 217        }
 218
 219        config &= ~0x7;
 220        config |= op_mode;
 221        __raw_writel(config, XOR_CONFIG(chan));
 222        chan->current_type = type;
 223}
 224
 225static void mv_chan_activate(struct mv_xor_chan *chan)
 226{
 227        u32 activation;
 228
 229        dev_dbg(mv_chan_to_devp(chan), " activate chan.\n");
 230        activation = __raw_readl(XOR_ACTIVATION(chan));
 231        activation |= 0x1;
 232        __raw_writel(activation, XOR_ACTIVATION(chan));
 233}
 234
 235static char mv_chan_is_busy(struct mv_xor_chan *chan)
 236{
 237        u32 state = __raw_readl(XOR_ACTIVATION(chan));
 238
 239        state = (state >> 4) & 0x3;
 240
 241        return (state == 1) ? 1 : 0;
 242}
 243
 244static int mv_chan_xor_slot_count(size_t len, int src_cnt)
 245{
 246        return 1;
 247}
 248
 249/**
 250 * mv_xor_free_slots - flags descriptor slots for reuse
 251 * @slot: Slot to free
 252 * Caller must hold &mv_chan->lock while calling this function
 253 */
 254static void mv_xor_free_slots(struct mv_xor_chan *mv_chan,
 255                              struct mv_xor_desc_slot *slot)
 256{
 257        dev_dbg(mv_chan_to_devp(mv_chan), "%s %d slot %p\n",
 258                __func__, __LINE__, slot);
 259
 260        slot->slots_per_op = 0;
 261
 262}
 263
 264/*
 265 * mv_xor_start_new_chain - program the engine to operate on new chain headed by
 266 * sw_desc
 267 * Caller must hold &mv_chan->lock while calling this function
 268 */
 269static void mv_xor_start_new_chain(struct mv_xor_chan *mv_chan,
 270                                   struct mv_xor_desc_slot *sw_desc)
 271{
 272        dev_dbg(mv_chan_to_devp(mv_chan), "%s %d: sw_desc %p\n",
 273                __func__, __LINE__, sw_desc);
 274        if (sw_desc->type != mv_chan->current_type)
 275                mv_set_mode(mv_chan, sw_desc->type);
 276
 277        if (sw_desc->type == DMA_MEMSET) {
 278                /* for memset requests we need to program the engine, no
 279                 * descriptors used.
 280                 */
 281                struct mv_xor_desc *hw_desc = sw_desc->hw_desc;
 282                mv_chan_set_dest_pointer(mv_chan, hw_desc->phy_dest_addr);
 283                mv_chan_set_block_size(mv_chan, sw_desc->unmap_len);
 284                mv_chan_set_value(mv_chan, sw_desc->value);
 285        } else {
 286                /* set the hardware chain */
 287                mv_chan_set_next_descriptor(mv_chan, sw_desc->async_tx.phys);
 288        }
 289        mv_chan->pending += sw_desc->slot_cnt;
 290        mv_xor_issue_pending(&mv_chan->dmachan);
 291}
 292
 293static dma_cookie_t
 294mv_xor_run_tx_complete_actions(struct mv_xor_desc_slot *desc,
 295        struct mv_xor_chan *mv_chan, dma_cookie_t cookie)
 296{
 297        BUG_ON(desc->async_tx.cookie < 0);
 298
 299        if (desc->async_tx.cookie > 0) {
 300                cookie = desc->async_tx.cookie;
 301
 302                /* call the callback (must not sleep or submit new
 303                 * operations to this channel)
 304                 */
 305                if (desc->async_tx.callback)
 306                        desc->async_tx.callback(
 307                                desc->async_tx.callback_param);
 308
 309                /* unmap dma addresses
 310                 * (unmap_single vs unmap_page?)
 311                 */
 312                if (desc->group_head && desc->unmap_len) {
 313                        struct mv_xor_desc_slot *unmap = desc->group_head;
 314                        struct device *dev = mv_chan_to_devp(mv_chan);
 315                        u32 len = unmap->unmap_len;
 316                        enum dma_ctrl_flags flags = desc->async_tx.flags;
 317                        u32 src_cnt;
 318                        dma_addr_t addr;
 319                        dma_addr_t dest;
 320
 321                        src_cnt = unmap->unmap_src_cnt;
 322                        dest = mv_desc_get_dest_addr(unmap);
 323                        if (!(flags & DMA_COMPL_SKIP_DEST_UNMAP)) {
 324                                enum dma_data_direction dir;
 325
 326                                if (src_cnt > 1) /* is xor ? */
 327                                        dir = DMA_BIDIRECTIONAL;
 328                                else
 329                                        dir = DMA_FROM_DEVICE;
 330                                dma_unmap_page(dev, dest, len, dir);
 331                        }
 332
 333                        if (!(flags & DMA_COMPL_SKIP_SRC_UNMAP)) {
 334                                while (src_cnt--) {
 335                                        addr = mv_desc_get_src_addr(unmap,
 336                                                                    src_cnt);
 337                                        if (addr == dest)
 338                                                continue;
 339                                        dma_unmap_page(dev, addr, len,
 340                                                       DMA_TO_DEVICE);
 341                                }
 342                        }
 343                        desc->group_head = NULL;
 344                }
 345        }
 346
 347        /* run dependent operations */
 348        dma_run_dependencies(&desc->async_tx);
 349
 350        return cookie;
 351}
 352
 353static int
 354mv_xor_clean_completed_slots(struct mv_xor_chan *mv_chan)
 355{
 356        struct mv_xor_desc_slot *iter, *_iter;
 357
 358        dev_dbg(mv_chan_to_devp(mv_chan), "%s %d\n", __func__, __LINE__);
 359        list_for_each_entry_safe(iter, _iter, &mv_chan->completed_slots,
 360                                 completed_node) {
 361
 362                if (async_tx_test_ack(&iter->async_tx)) {
 363                        list_del(&iter->completed_node);
 364                        mv_xor_free_slots(mv_chan, iter);
 365                }
 366        }
 367        return 0;
 368}
 369
 370static int
 371mv_xor_clean_slot(struct mv_xor_desc_slot *desc,
 372        struct mv_xor_chan *mv_chan)
 373{
 374        dev_dbg(mv_chan_to_devp(mv_chan), "%s %d: desc %p flags %d\n",
 375                __func__, __LINE__, desc, desc->async_tx.flags);
 376        list_del(&desc->chain_node);
 377        /* the client is allowed to attach dependent operations
 378         * until 'ack' is set
 379         */
 380        if (!async_tx_test_ack(&desc->async_tx)) {
 381                /* move this slot to the completed_slots */
 382                list_add_tail(&desc->completed_node, &mv_chan->completed_slots);
 383                return 0;
 384        }
 385
 386        mv_xor_free_slots(mv_chan, desc);
 387        return 0;
 388}
 389
 390static void __mv_xor_slot_cleanup(struct mv_xor_chan *mv_chan)
 391{
 392        struct mv_xor_desc_slot *iter, *_iter;
 393        dma_cookie_t cookie = 0;
 394        int busy = mv_chan_is_busy(mv_chan);
 395        u32 current_desc = mv_chan_get_current_desc(mv_chan);
 396        int seen_current = 0;
 397
 398        dev_dbg(mv_chan_to_devp(mv_chan), "%s %d\n", __func__, __LINE__);
 399        dev_dbg(mv_chan_to_devp(mv_chan), "current_desc %x\n", current_desc);
 400        mv_xor_clean_completed_slots(mv_chan);
 401
 402        /* free completed slots from the chain starting with
 403         * the oldest descriptor
 404         */
 405
 406        list_for_each_entry_safe(iter, _iter, &mv_chan->chain,
 407                                        chain_node) {
 408                prefetch(_iter);
 409                prefetch(&_iter->async_tx);
 410
 411                /* do not advance past the current descriptor loaded into the
 412                 * hardware channel, subsequent descriptors are either in
 413                 * process or have not been submitted
 414                 */
 415                if (seen_current)
 416                        break;
 417
 418                /* stop the search if we reach the current descriptor and the
 419                 * channel is busy
 420                 */
 421                if (iter->async_tx.phys == current_desc) {
 422                        seen_current = 1;
 423                        if (busy)
 424                                break;
 425                }
 426
 427                cookie = mv_xor_run_tx_complete_actions(iter, mv_chan, cookie);
 428
 429                if (mv_xor_clean_slot(iter, mv_chan))
 430                        break;
 431        }
 432
 433        if ((busy == 0) && !list_empty(&mv_chan->chain)) {
 434                struct mv_xor_desc_slot *chain_head;
 435                chain_head = list_entry(mv_chan->chain.next,
 436                                        struct mv_xor_desc_slot,
 437                                        chain_node);
 438
 439                mv_xor_start_new_chain(mv_chan, chain_head);
 440        }
 441
 442        if (cookie > 0)
 443                mv_chan->dmachan.completed_cookie = cookie;
 444}
 445
 446static void
 447mv_xor_slot_cleanup(struct mv_xor_chan *mv_chan)
 448{
 449        spin_lock_bh(&mv_chan->lock);
 450        __mv_xor_slot_cleanup(mv_chan);
 451        spin_unlock_bh(&mv_chan->lock);
 452}
 453
 454static void mv_xor_tasklet(unsigned long data)
 455{
 456        struct mv_xor_chan *chan = (struct mv_xor_chan *) data;
 457        mv_xor_slot_cleanup(chan);
 458}
 459
 460static struct mv_xor_desc_slot *
 461mv_xor_alloc_slots(struct mv_xor_chan *mv_chan, int num_slots,
 462                    int slots_per_op)
 463{
 464        struct mv_xor_desc_slot *iter, *_iter, *alloc_start = NULL;
 465        LIST_HEAD(chain);
 466        int slots_found, retry = 0;
 467
 468        /* start search from the last allocated descrtiptor
 469         * if a contiguous allocation can not be found start searching
 470         * from the beginning of the list
 471         */
 472retry:
 473        slots_found = 0;
 474        if (retry == 0)
 475                iter = mv_chan->last_used;
 476        else
 477                iter = list_entry(&mv_chan->all_slots,
 478                        struct mv_xor_desc_slot,
 479                        slot_node);
 480
 481        list_for_each_entry_safe_continue(
 482                iter, _iter, &mv_chan->all_slots, slot_node) {
 483                prefetch(_iter);
 484                prefetch(&_iter->async_tx);
 485                if (iter->slots_per_op) {
 486                        /* give up after finding the first busy slot
 487                         * on the second pass through the list
 488                         */
 489                        if (retry)
 490                                break;
 491
 492                        slots_found = 0;
 493                        continue;
 494                }
 495
 496                /* start the allocation if the slot is correctly aligned */
 497                if (!slots_found++)
 498                        alloc_start = iter;
 499
 500                if (slots_found == num_slots) {
 501                        struct mv_xor_desc_slot *alloc_tail = NULL;
 502                        struct mv_xor_desc_slot *last_used = NULL;
 503                        iter = alloc_start;
 504                        while (num_slots) {
 505                                int i;
 506
 507                                /* pre-ack all but the last descriptor */
 508                                async_tx_ack(&iter->async_tx);
 509
 510                                list_add_tail(&iter->chain_node, &chain);
 511                                alloc_tail = iter;
 512                                iter->async_tx.cookie = 0;
 513                                iter->slot_cnt = num_slots;
 514                                iter->xor_check_result = NULL;
 515                                for (i = 0; i < slots_per_op; i++) {
 516                                        iter->slots_per_op = slots_per_op - i;
 517                                        last_used = iter;
 518                                        iter = list_entry(iter->slot_node.next,
 519                                                struct mv_xor_desc_slot,
 520                                                slot_node);
 521                                }
 522                                num_slots -= slots_per_op;
 523                        }
 524                        alloc_tail->group_head = alloc_start;
 525                        alloc_tail->async_tx.cookie = -EBUSY;
 526                        list_splice(&chain, &alloc_tail->tx_list);
 527                        mv_chan->last_used = last_used;
 528                        mv_desc_clear_next_desc(alloc_start);
 529                        mv_desc_clear_next_desc(alloc_tail);
 530                        return alloc_tail;
 531                }
 532        }
 533        if (!retry++)
 534                goto retry;
 535
 536        /* try to free some slots if the allocation fails */
 537        tasklet_schedule(&mv_chan->irq_tasklet);
 538
 539        return NULL;
 540}
 541
 542/************************ DMA engine API functions ****************************/
 543static dma_cookie_t
 544mv_xor_tx_submit(struct dma_async_tx_descriptor *tx)
 545{
 546        struct mv_xor_desc_slot *sw_desc = to_mv_xor_slot(tx);
 547        struct mv_xor_chan *mv_chan = to_mv_xor_chan(tx->chan);
 548        struct mv_xor_desc_slot *grp_start, *old_chain_tail;
 549        dma_cookie_t cookie;
 550        int new_hw_chain = 1;
 551
 552        dev_dbg(mv_chan_to_devp(mv_chan),
 553                "%s sw_desc %p: async_tx %p\n",
 554                __func__, sw_desc, &sw_desc->async_tx);
 555
 556        grp_start = sw_desc->group_head;
 557
 558        spin_lock_bh(&mv_chan->lock);
 559        cookie = dma_cookie_assign(tx);
 560
 561        if (list_empty(&mv_chan->chain))
 562                list_splice_init(&sw_desc->tx_list, &mv_chan->chain);
 563        else {
 564                new_hw_chain = 0;
 565
 566                old_chain_tail = list_entry(mv_chan->chain.prev,
 567                                            struct mv_xor_desc_slot,
 568                                            chain_node);
 569                list_splice_init(&grp_start->tx_list,
 570                                 &old_chain_tail->chain_node);
 571
 572                if (!mv_can_chain(grp_start))
 573                        goto submit_done;
 574
 575                dev_dbg(mv_chan_to_devp(mv_chan), "Append to last desc %x\n",
 576                        old_chain_tail->async_tx.phys);
 577
 578                /* fix up the hardware chain */
 579                mv_desc_set_next_desc(old_chain_tail, grp_start->async_tx.phys);
 580
 581                /* if the channel is not busy */
 582                if (!mv_chan_is_busy(mv_chan)) {
 583                        u32 current_desc = mv_chan_get_current_desc(mv_chan);
 584                        /*
 585                         * and the curren desc is the end of the chain before
 586                         * the append, then we need to start the channel
 587                         */
 588                        if (current_desc == old_chain_tail->async_tx.phys)
 589                                new_hw_chain = 1;
 590                }
 591        }
 592
 593        if (new_hw_chain)
 594                mv_xor_start_new_chain(mv_chan, grp_start);
 595
 596submit_done:
 597        spin_unlock_bh(&mv_chan->lock);
 598
 599        return cookie;
 600}
 601
 602/* returns the number of allocated descriptors */
 603static int mv_xor_alloc_chan_resources(struct dma_chan *chan)
 604{
 605        char *hw_desc;
 606        int idx;
 607        struct mv_xor_chan *mv_chan = to_mv_xor_chan(chan);
 608        struct mv_xor_desc_slot *slot = NULL;
 609        int num_descs_in_pool = MV_XOR_POOL_SIZE/MV_XOR_SLOT_SIZE;
 610
 611        /* Allocate descriptor slots */
 612        idx = mv_chan->slots_allocated;
 613        while (idx < num_descs_in_pool) {
 614                slot = kzalloc(sizeof(*slot), GFP_KERNEL);
 615                if (!slot) {
 616                        printk(KERN_INFO "MV XOR Channel only initialized"
 617                                " %d descriptor slots", idx);
 618                        break;
 619                }
 620                hw_desc = (char *) mv_chan->dma_desc_pool_virt;
 621                slot->hw_desc = (void *) &hw_desc[idx * MV_XOR_SLOT_SIZE];
 622
 623                dma_async_tx_descriptor_init(&slot->async_tx, chan);
 624                slot->async_tx.tx_submit = mv_xor_tx_submit;
 625                INIT_LIST_HEAD(&slot->chain_node);
 626                INIT_LIST_HEAD(&slot->slot_node);
 627                INIT_LIST_HEAD(&slot->tx_list);
 628                hw_desc = (char *) mv_chan->dma_desc_pool;
 629                slot->async_tx.phys =
 630                        (dma_addr_t) &hw_desc[idx * MV_XOR_SLOT_SIZE];
 631                slot->idx = idx++;
 632
 633                spin_lock_bh(&mv_chan->lock);
 634                mv_chan->slots_allocated = idx;
 635                list_add_tail(&slot->slot_node, &mv_chan->all_slots);
 636                spin_unlock_bh(&mv_chan->lock);
 637        }
 638
 639        if (mv_chan->slots_allocated && !mv_chan->last_used)
 640                mv_chan->last_used = list_entry(mv_chan->all_slots.next,
 641                                        struct mv_xor_desc_slot,
 642                                        slot_node);
 643
 644        dev_dbg(mv_chan_to_devp(mv_chan),
 645                "allocated %d descriptor slots last_used: %p\n",
 646                mv_chan->slots_allocated, mv_chan->last_used);
 647
 648        return mv_chan->slots_allocated ? : -ENOMEM;
 649}
 650
 651static struct dma_async_tx_descriptor *
 652mv_xor_prep_dma_memcpy(struct dma_chan *chan, dma_addr_t dest, dma_addr_t src,
 653                size_t len, unsigned long flags)
 654{
 655        struct mv_xor_chan *mv_chan = to_mv_xor_chan(chan);
 656        struct mv_xor_desc_slot *sw_desc, *grp_start;
 657        int slot_cnt;
 658
 659        dev_dbg(mv_chan_to_devp(mv_chan),
 660                "%s dest: %x src %x len: %u flags: %ld\n",
 661                __func__, dest, src, len, flags);
 662        if (unlikely(len < MV_XOR_MIN_BYTE_COUNT))
 663                return NULL;
 664
 665        BUG_ON(len > MV_XOR_MAX_BYTE_COUNT);
 666
 667        spin_lock_bh(&mv_chan->lock);
 668        slot_cnt = mv_chan_memcpy_slot_count(len);
 669        sw_desc = mv_xor_alloc_slots(mv_chan, slot_cnt, 1);
 670        if (sw_desc) {
 671                sw_desc->type = DMA_MEMCPY;
 672                sw_desc->async_tx.flags = flags;
 673                grp_start = sw_desc->group_head;
 674                mv_desc_init(grp_start, flags);
 675                mv_desc_set_byte_count(grp_start, len);
 676                mv_desc_set_dest_addr(sw_desc->group_head, dest);
 677                mv_desc_set_src_addr(grp_start, 0, src);
 678                sw_desc->unmap_src_cnt = 1;
 679                sw_desc->unmap_len = len;
 680        }
 681        spin_unlock_bh(&mv_chan->lock);
 682
 683        dev_dbg(mv_chan_to_devp(mv_chan),
 684                "%s sw_desc %p async_tx %p\n",
 685                __func__, sw_desc, sw_desc ? &sw_desc->async_tx : 0);
 686
 687        return sw_desc ? &sw_desc->async_tx : NULL;
 688}
 689
 690static struct dma_async_tx_descriptor *
 691mv_xor_prep_dma_memset(struct dma_chan *chan, dma_addr_t dest, int value,
 692                       size_t len, unsigned long flags)
 693{
 694        struct mv_xor_chan *mv_chan = to_mv_xor_chan(chan);
 695        struct mv_xor_desc_slot *sw_desc, *grp_start;
 696        int slot_cnt;
 697
 698        dev_dbg(mv_chan_to_devp(mv_chan),
 699                "%s dest: %x len: %u flags: %ld\n",
 700                __func__, dest, len, flags);
 701        if (unlikely(len < MV_XOR_MIN_BYTE_COUNT))
 702                return NULL;
 703
 704        BUG_ON(len > MV_XOR_MAX_BYTE_COUNT);
 705
 706        spin_lock_bh(&mv_chan->lock);
 707        slot_cnt = mv_chan_memset_slot_count(len);
 708        sw_desc = mv_xor_alloc_slots(mv_chan, slot_cnt, 1);
 709        if (sw_desc) {
 710                sw_desc->type = DMA_MEMSET;
 711                sw_desc->async_tx.flags = flags;
 712                grp_start = sw_desc->group_head;
 713                mv_desc_init(grp_start, flags);
 714                mv_desc_set_byte_count(grp_start, len);
 715                mv_desc_set_dest_addr(sw_desc->group_head, dest);
 716                mv_desc_set_block_fill_val(grp_start, value);
 717                sw_desc->unmap_src_cnt = 1;
 718                sw_desc->unmap_len = len;
 719        }
 720        spin_unlock_bh(&mv_chan->lock);
 721        dev_dbg(mv_chan_to_devp(mv_chan),
 722                "%s sw_desc %p async_tx %p \n",
 723                __func__, sw_desc, &sw_desc->async_tx);
 724        return sw_desc ? &sw_desc->async_tx : NULL;
 725}
 726
 727static struct dma_async_tx_descriptor *
 728mv_xor_prep_dma_xor(struct dma_chan *chan, dma_addr_t dest, dma_addr_t *src,
 729                    unsigned int src_cnt, size_t len, unsigned long flags)
 730{
 731        struct mv_xor_chan *mv_chan = to_mv_xor_chan(chan);
 732        struct mv_xor_desc_slot *sw_desc, *grp_start;
 733        int slot_cnt;
 734
 735        if (unlikely(len < MV_XOR_MIN_BYTE_COUNT))
 736                return NULL;
 737
 738        BUG_ON(len > MV_XOR_MAX_BYTE_COUNT);
 739
 740        dev_dbg(mv_chan_to_devp(mv_chan),
 741                "%s src_cnt: %d len: dest %x %u flags: %ld\n",
 742                __func__, src_cnt, len, dest, flags);
 743
 744        spin_lock_bh(&mv_chan->lock);
 745        slot_cnt = mv_chan_xor_slot_count(len, src_cnt);
 746        sw_desc = mv_xor_alloc_slots(mv_chan, slot_cnt, 1);
 747        if (sw_desc) {
 748                sw_desc->type = DMA_XOR;
 749                sw_desc->async_tx.flags = flags;
 750                grp_start = sw_desc->group_head;
 751                mv_desc_init(grp_start, flags);
 752                /* the byte count field is the same as in memcpy desc*/
 753                mv_desc_set_byte_count(grp_start, len);
 754                mv_desc_set_dest_addr(sw_desc->group_head, dest);
 755                sw_desc->unmap_src_cnt = src_cnt;
 756                sw_desc->unmap_len = len;
 757                while (src_cnt--)
 758                        mv_desc_set_src_addr(grp_start, src_cnt, src[src_cnt]);
 759        }
 760        spin_unlock_bh(&mv_chan->lock);
 761        dev_dbg(mv_chan_to_devp(mv_chan),
 762                "%s sw_desc %p async_tx %p \n",
 763                __func__, sw_desc, &sw_desc->async_tx);
 764        return sw_desc ? &sw_desc->async_tx : NULL;
 765}
 766
 767static void mv_xor_free_chan_resources(struct dma_chan *chan)
 768{
 769        struct mv_xor_chan *mv_chan = to_mv_xor_chan(chan);
 770        struct mv_xor_desc_slot *iter, *_iter;
 771        int in_use_descs = 0;
 772
 773        mv_xor_slot_cleanup(mv_chan);
 774
 775        spin_lock_bh(&mv_chan->lock);
 776        list_for_each_entry_safe(iter, _iter, &mv_chan->chain,
 777                                        chain_node) {
 778                in_use_descs++;
 779                list_del(&iter->chain_node);
 780        }
 781        list_for_each_entry_safe(iter, _iter, &mv_chan->completed_slots,
 782                                 completed_node) {
 783                in_use_descs++;
 784                list_del(&iter->completed_node);
 785        }
 786        list_for_each_entry_safe_reverse(
 787                iter, _iter, &mv_chan->all_slots, slot_node) {
 788                list_del(&iter->slot_node);
 789                kfree(iter);
 790                mv_chan->slots_allocated--;
 791        }
 792        mv_chan->last_used = NULL;
 793
 794        dev_dbg(mv_chan_to_devp(mv_chan), "%s slots_allocated %d\n",
 795                __func__, mv_chan->slots_allocated);
 796        spin_unlock_bh(&mv_chan->lock);
 797
 798        if (in_use_descs)
 799                dev_err(mv_chan_to_devp(mv_chan),
 800                        "freeing %d in use descriptors!\n", in_use_descs);
 801}
 802
 803/**
 804 * mv_xor_status - poll the status of an XOR transaction
 805 * @chan: XOR channel handle
 806 * @cookie: XOR transaction identifier
 807 * @txstate: XOR transactions state holder (or NULL)
 808 */
 809static enum dma_status mv_xor_status(struct dma_chan *chan,
 810                                          dma_cookie_t cookie,
 811                                          struct dma_tx_state *txstate)
 812{
 813        struct mv_xor_chan *mv_chan = to_mv_xor_chan(chan);
 814        enum dma_status ret;
 815
 816        ret = dma_cookie_status(chan, cookie, txstate);
 817        if (ret == DMA_SUCCESS) {
 818                mv_xor_clean_completed_slots(mv_chan);
 819                return ret;
 820        }
 821        mv_xor_slot_cleanup(mv_chan);
 822
 823        return dma_cookie_status(chan, cookie, txstate);
 824}
 825
 826static void mv_dump_xor_regs(struct mv_xor_chan *chan)
 827{
 828        u32 val;
 829
 830        val = __raw_readl(XOR_CONFIG(chan));
 831        dev_err(mv_chan_to_devp(chan),
 832                "config       0x%08x.\n", val);
 833
 834        val = __raw_readl(XOR_ACTIVATION(chan));
 835        dev_err(mv_chan_to_devp(chan),
 836                "activation   0x%08x.\n", val);
 837
 838        val = __raw_readl(XOR_INTR_CAUSE(chan));
 839        dev_err(mv_chan_to_devp(chan),
 840                "intr cause   0x%08x.\n", val);
 841
 842        val = __raw_readl(XOR_INTR_MASK(chan));
 843        dev_err(mv_chan_to_devp(chan),
 844                "intr mask    0x%08x.\n", val);
 845
 846        val = __raw_readl(XOR_ERROR_CAUSE(chan));
 847        dev_err(mv_chan_to_devp(chan),
 848                "error cause  0x%08x.\n", val);
 849
 850        val = __raw_readl(XOR_ERROR_ADDR(chan));
 851        dev_err(mv_chan_to_devp(chan),
 852                "error addr   0x%08x.\n", val);
 853}
 854
 855static void mv_xor_err_interrupt_handler(struct mv_xor_chan *chan,
 856                                         u32 intr_cause)
 857{
 858        if (intr_cause & (1 << 4)) {
 859             dev_dbg(mv_chan_to_devp(chan),
 860                     "ignore this error\n");
 861             return;
 862        }
 863
 864        dev_err(mv_chan_to_devp(chan),
 865                "error on chan %d. intr cause 0x%08x.\n",
 866                chan->idx, intr_cause);
 867
 868        mv_dump_xor_regs(chan);
 869        BUG();
 870}
 871
 872static irqreturn_t mv_xor_interrupt_handler(int irq, void *data)
 873{
 874        struct mv_xor_chan *chan = data;
 875        u32 intr_cause = mv_chan_get_intr_cause(chan);
 876
 877        dev_dbg(mv_chan_to_devp(chan), "intr cause %x\n", intr_cause);
 878
 879        if (mv_is_err_intr(intr_cause))
 880                mv_xor_err_interrupt_handler(chan, intr_cause);
 881
 882        tasklet_schedule(&chan->irq_tasklet);
 883
 884        mv_xor_device_clear_eoc_cause(chan);
 885
 886        return IRQ_HANDLED;
 887}
 888
 889static void mv_xor_issue_pending(struct dma_chan *chan)
 890{
 891        struct mv_xor_chan *mv_chan = to_mv_xor_chan(chan);
 892
 893        if (mv_chan->pending >= MV_XOR_THRESHOLD) {
 894                mv_chan->pending = 0;
 895                mv_chan_activate(mv_chan);
 896        }
 897}
 898
 899/*
 900 * Perform a transaction to verify the HW works.
 901 */
 902#define MV_XOR_TEST_SIZE 2000
 903
 904static int mv_xor_memcpy_self_test(struct mv_xor_chan *mv_chan)
 905{
 906        int i;
 907        void *src, *dest;
 908        dma_addr_t src_dma, dest_dma;
 909        struct dma_chan *dma_chan;
 910        dma_cookie_t cookie;
 911        struct dma_async_tx_descriptor *tx;
 912        int err = 0;
 913
 914        src = kmalloc(sizeof(u8) * MV_XOR_TEST_SIZE, GFP_KERNEL);
 915        if (!src)
 916                return -ENOMEM;
 917
 918        dest = kzalloc(sizeof(u8) * MV_XOR_TEST_SIZE, GFP_KERNEL);
 919        if (!dest) {
 920                kfree(src);
 921                return -ENOMEM;
 922        }
 923
 924        /* Fill in src buffer */
 925        for (i = 0; i < MV_XOR_TEST_SIZE; i++)
 926                ((u8 *) src)[i] = (u8)i;
 927
 928        dma_chan = &mv_chan->dmachan;
 929        if (mv_xor_alloc_chan_resources(dma_chan) < 1) {
 930                err = -ENODEV;
 931                goto out;
 932        }
 933
 934        dest_dma = dma_map_single(dma_chan->device->dev, dest,
 935                                  MV_XOR_TEST_SIZE, DMA_FROM_DEVICE);
 936
 937        src_dma = dma_map_single(dma_chan->device->dev, src,
 938                                 MV_XOR_TEST_SIZE, DMA_TO_DEVICE);
 939
 940        tx = mv_xor_prep_dma_memcpy(dma_chan, dest_dma, src_dma,
 941                                    MV_XOR_TEST_SIZE, 0);
 942        cookie = mv_xor_tx_submit(tx);
 943        mv_xor_issue_pending(dma_chan);
 944        async_tx_ack(tx);
 945        msleep(1);
 946
 947        if (mv_xor_status(dma_chan, cookie, NULL) !=
 948            DMA_SUCCESS) {
 949                dev_err(dma_chan->device->dev,
 950                        "Self-test copy timed out, disabling\n");
 951                err = -ENODEV;
 952                goto free_resources;
 953        }
 954
 955        dma_sync_single_for_cpu(dma_chan->device->dev, dest_dma,
 956                                MV_XOR_TEST_SIZE, DMA_FROM_DEVICE);
 957        if (memcmp(src, dest, MV_XOR_TEST_SIZE)) {
 958                dev_err(dma_chan->device->dev,
 959                        "Self-test copy failed compare, disabling\n");
 960                err = -ENODEV;
 961                goto free_resources;
 962        }
 963
 964free_resources:
 965        mv_xor_free_chan_resources(dma_chan);
 966out:
 967        kfree(src);
 968        kfree(dest);
 969        return err;
 970}
 971
 972#define MV_XOR_NUM_SRC_TEST 4 /* must be <= 15 */
 973static int
 974mv_xor_xor_self_test(struct mv_xor_chan *mv_chan)
 975{
 976        int i, src_idx;
 977        struct page *dest;
 978        struct page *xor_srcs[MV_XOR_NUM_SRC_TEST];
 979        dma_addr_t dma_srcs[MV_XOR_NUM_SRC_TEST];
 980        dma_addr_t dest_dma;
 981        struct dma_async_tx_descriptor *tx;
 982        struct dma_chan *dma_chan;
 983        dma_cookie_t cookie;
 984        u8 cmp_byte = 0;
 985        u32 cmp_word;
 986        int err = 0;
 987
 988        for (src_idx = 0; src_idx < MV_XOR_NUM_SRC_TEST; src_idx++) {
 989                xor_srcs[src_idx] = alloc_page(GFP_KERNEL);
 990                if (!xor_srcs[src_idx]) {
 991                        while (src_idx--)
 992                                __free_page(xor_srcs[src_idx]);
 993                        return -ENOMEM;
 994                }
 995        }
 996
 997        dest = alloc_page(GFP_KERNEL);
 998        if (!dest) {
 999                while (src_idx--)
1000                        __free_page(xor_srcs[src_idx]);
1001                return -ENOMEM;
1002        }
1003
1004        /* Fill in src buffers */
1005        for (src_idx = 0; src_idx < MV_XOR_NUM_SRC_TEST; src_idx++) {
1006                u8 *ptr = page_address(xor_srcs[src_idx]);
1007                for (i = 0; i < PAGE_SIZE; i++)
1008                        ptr[i] = (1 << src_idx);
1009        }
1010
1011        for (src_idx = 0; src_idx < MV_XOR_NUM_SRC_TEST; src_idx++)
1012                cmp_byte ^= (u8) (1 << src_idx);
1013
1014        cmp_word = (cmp_byte << 24) | (cmp_byte << 16) |
1015                (cmp_byte << 8) | cmp_byte;
1016
1017        memset(page_address(dest), 0, PAGE_SIZE);
1018
1019        dma_chan = &mv_chan->dmachan;
1020        if (mv_xor_alloc_chan_resources(dma_chan) < 1) {
1021                err = -ENODEV;
1022                goto out;
1023        }
1024
1025        /* test xor */
1026        dest_dma = dma_map_page(dma_chan->device->dev, dest, 0, PAGE_SIZE,
1027                                DMA_FROM_DEVICE);
1028
1029        for (i = 0; i < MV_XOR_NUM_SRC_TEST; i++)
1030                dma_srcs[i] = dma_map_page(dma_chan->device->dev, xor_srcs[i],
1031                                           0, PAGE_SIZE, DMA_TO_DEVICE);
1032
1033        tx = mv_xor_prep_dma_xor(dma_chan, dest_dma, dma_srcs,
1034                                 MV_XOR_NUM_SRC_TEST, PAGE_SIZE, 0);
1035
1036        cookie = mv_xor_tx_submit(tx);
1037        mv_xor_issue_pending(dma_chan);
1038        async_tx_ack(tx);
1039        msleep(8);
1040
1041        if (mv_xor_status(dma_chan, cookie, NULL) !=
1042            DMA_SUCCESS) {
1043                dev_err(dma_chan->device->dev,
1044                        "Self-test xor timed out, disabling\n");
1045                err = -ENODEV;
1046                goto free_resources;
1047        }
1048
1049        dma_sync_single_for_cpu(dma_chan->device->dev, dest_dma,
1050                                PAGE_SIZE, DMA_FROM_DEVICE);
1051        for (i = 0; i < (PAGE_SIZE / sizeof(u32)); i++) {
1052                u32 *ptr = page_address(dest);
1053                if (ptr[i] != cmp_word) {
1054                        dev_err(dma_chan->device->dev,
1055                                "Self-test xor failed compare, disabling."
1056                                " index %d, data %x, expected %x\n", i,
1057                                ptr[i], cmp_word);
1058                        err = -ENODEV;
1059                        goto free_resources;
1060                }
1061        }
1062
1063free_resources:
1064        mv_xor_free_chan_resources(dma_chan);
1065out:
1066        src_idx = MV_XOR_NUM_SRC_TEST;
1067        while (src_idx--)
1068                __free_page(xor_srcs[src_idx]);
1069        __free_page(dest);
1070        return err;
1071}
1072
1073/* This driver does not implement any of the optional DMA operations. */
1074static int
1075mv_xor_control(struct dma_chan *chan, enum dma_ctrl_cmd cmd,
1076               unsigned long arg)
1077{
1078        return -ENOSYS;
1079}
1080
1081static int mv_xor_channel_remove(struct mv_xor_chan *mv_chan)
1082{
1083        struct dma_chan *chan, *_chan;
1084        struct device *dev = mv_chan->dmadev.dev;
1085
1086        dma_async_device_unregister(&mv_chan->dmadev);
1087
1088        dma_free_coherent(dev, MV_XOR_POOL_SIZE,
1089                          mv_chan->dma_desc_pool_virt, mv_chan->dma_desc_pool);
1090
1091        list_for_each_entry_safe(chan, _chan, &mv_chan->dmadev.channels,
1092                                 device_node) {
1093                list_del(&chan->device_node);
1094        }
1095
1096        free_irq(mv_chan->irq, mv_chan);
1097
1098        return 0;
1099}
1100
1101static struct mv_xor_chan *
1102mv_xor_channel_add(struct mv_xor_device *xordev,
1103                   struct platform_device *pdev,
1104                   int idx, dma_cap_mask_t cap_mask, int irq)
1105{
1106        int ret = 0;
1107        struct mv_xor_chan *mv_chan;
1108        struct dma_device *dma_dev;
1109
1110        mv_chan = devm_kzalloc(&pdev->dev, sizeof(*mv_chan), GFP_KERNEL);
1111        if (!mv_chan) {
1112                ret = -ENOMEM;
1113                goto err_free_dma;
1114        }
1115
1116        mv_chan->idx = idx;
1117        mv_chan->irq = irq;
1118
1119        dma_dev = &mv_chan->dmadev;
1120
1121        /* allocate coherent memory for hardware descriptors
1122         * note: writecombine gives slightly better performance, but
1123         * requires that we explicitly flush the writes
1124         */
1125        mv_chan->dma_desc_pool_virt =
1126          dma_alloc_writecombine(&pdev->dev, MV_XOR_POOL_SIZE,
1127                                 &mv_chan->dma_desc_pool, GFP_KERNEL);
1128        if (!mv_chan->dma_desc_pool_virt)
1129                return ERR_PTR(-ENOMEM);
1130
1131        /* discover transaction capabilites from the platform data */
1132        dma_dev->cap_mask = cap_mask;
1133
1134        INIT_LIST_HEAD(&dma_dev->channels);
1135
1136        /* set base routines */
1137        dma_dev->device_alloc_chan_resources = mv_xor_alloc_chan_resources;
1138        dma_dev->device_free_chan_resources = mv_xor_free_chan_resources;
1139        dma_dev->device_tx_status = mv_xor_status;
1140        dma_dev->device_issue_pending = mv_xor_issue_pending;
1141        dma_dev->device_control = mv_xor_control;
1142        dma_dev->dev = &pdev->dev;
1143
1144        /* set prep routines based on capability */
1145        if (dma_has_cap(DMA_MEMCPY, dma_dev->cap_mask))
1146                dma_dev->device_prep_dma_memcpy = mv_xor_prep_dma_memcpy;
1147        if (dma_has_cap(DMA_MEMSET, dma_dev->cap_mask))
1148                dma_dev->device_prep_dma_memset = mv_xor_prep_dma_memset;
1149        if (dma_has_cap(DMA_XOR, dma_dev->cap_mask)) {
1150                dma_dev->max_xor = 8;
1151                dma_dev->device_prep_dma_xor = mv_xor_prep_dma_xor;
1152        }
1153
1154        mv_chan->mmr_base = xordev->xor_base;
1155        if (!mv_chan->mmr_base) {
1156                ret = -ENOMEM;
1157                goto err_free_dma;
1158        }
1159        tasklet_init(&mv_chan->irq_tasklet, mv_xor_tasklet, (unsigned long)
1160                     mv_chan);
1161
1162        /* clear errors before enabling interrupts */
1163        mv_xor_device_clear_err_status(mv_chan);
1164
1165        ret = request_irq(mv_chan->irq, mv_xor_interrupt_handler,
1166                          0, dev_name(&pdev->dev), mv_chan);
1167        if (ret)
1168                goto err_free_dma;
1169
1170        mv_chan_unmask_interrupts(mv_chan);
1171
1172        mv_set_mode(mv_chan, DMA_MEMCPY);
1173
1174        spin_lock_init(&mv_chan->lock);
1175        INIT_LIST_HEAD(&mv_chan->chain);
1176        INIT_LIST_HEAD(&mv_chan->completed_slots);
1177        INIT_LIST_HEAD(&mv_chan->all_slots);
1178        mv_chan->dmachan.device = dma_dev;
1179        dma_cookie_init(&mv_chan->dmachan);
1180
1181        list_add_tail(&mv_chan->dmachan.device_node, &dma_dev->channels);
1182
1183        if (dma_has_cap(DMA_MEMCPY, dma_dev->cap_mask)) {
1184                ret = mv_xor_memcpy_self_test(mv_chan);
1185                dev_dbg(&pdev->dev, "memcpy self test returned %d\n", ret);
1186                if (ret)
1187                        goto err_free_irq;
1188        }
1189
1190        if (dma_has_cap(DMA_XOR, dma_dev->cap_mask)) {
1191                ret = mv_xor_xor_self_test(mv_chan);
1192                dev_dbg(&pdev->dev, "xor self test returned %d\n", ret);
1193                if (ret)
1194                        goto err_free_irq;
1195        }
1196
1197        dev_info(&pdev->dev, "Marvell XOR: "
1198          "( %s%s%s%s)\n",
1199          dma_has_cap(DMA_XOR, dma_dev->cap_mask) ? "xor " : "",
1200          dma_has_cap(DMA_MEMSET, dma_dev->cap_mask)  ? "fill " : "",
1201          dma_has_cap(DMA_MEMCPY, dma_dev->cap_mask) ? "cpy " : "",
1202          dma_has_cap(DMA_INTERRUPT, dma_dev->cap_mask) ? "intr " : "");
1203
1204        dma_async_device_register(dma_dev);
1205        return mv_chan;
1206
1207err_free_irq:
1208        free_irq(mv_chan->irq, mv_chan);
1209 err_free_dma:
1210        dma_free_coherent(&pdev->dev, MV_XOR_POOL_SIZE,
1211                          mv_chan->dma_desc_pool_virt, mv_chan->dma_desc_pool);
1212        return ERR_PTR(ret);
1213}
1214
1215static void
1216mv_xor_conf_mbus_windows(struct mv_xor_device *xordev,
1217                         const struct mbus_dram_target_info *dram)
1218{
1219        void __iomem *base = xordev->xor_base;
1220        u32 win_enable = 0;
1221        int i;
1222
1223        for (i = 0; i < 8; i++) {
1224                writel(0, base + WINDOW_BASE(i));
1225                writel(0, base + WINDOW_SIZE(i));
1226                if (i < 4)
1227                        writel(0, base + WINDOW_REMAP_HIGH(i));
1228        }
1229
1230        for (i = 0; i < dram->num_cs; i++) {
1231                const struct mbus_dram_window *cs = dram->cs + i;
1232
1233                writel((cs->base & 0xffff0000) |
1234                       (cs->mbus_attr << 8) |
1235                       dram->mbus_dram_target_id, base + WINDOW_BASE(i));
1236                writel((cs->size - 1) & 0xffff0000, base + WINDOW_SIZE(i));
1237
1238                win_enable |= (1 << i);
1239                win_enable |= 3 << (16 + (2 * i));
1240        }
1241
1242        writel(win_enable, base + WINDOW_BAR_ENABLE(0));
1243        writel(win_enable, base + WINDOW_BAR_ENABLE(1));
1244        writel(0, base + WINDOW_OVERRIDE_CTRL(0));
1245        writel(0, base + WINDOW_OVERRIDE_CTRL(1));
1246}
1247
1248static int mv_xor_probe(struct platform_device *pdev)
1249{
1250        const struct mbus_dram_target_info *dram;
1251        struct mv_xor_device *xordev;
1252        struct mv_xor_platform_data *pdata = pdev->dev.platform_data;
1253        struct resource *res;
1254        int i, ret;
1255
1256        dev_notice(&pdev->dev, "Marvell XOR driver\n");
1257
1258        xordev = devm_kzalloc(&pdev->dev, sizeof(*xordev), GFP_KERNEL);
1259        if (!xordev)
1260                return -ENOMEM;
1261
1262        res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
1263        if (!res)
1264                return -ENODEV;
1265
1266        xordev->xor_base = devm_ioremap(&pdev->dev, res->start,
1267                                        resource_size(res));
1268        if (!xordev->xor_base)
1269                return -EBUSY;
1270
1271        res = platform_get_resource(pdev, IORESOURCE_MEM, 1);
1272        if (!res)
1273                return -ENODEV;
1274
1275        xordev->xor_high_base = devm_ioremap(&pdev->dev, res->start,
1276                                             resource_size(res));
1277        if (!xordev->xor_high_base)
1278                return -EBUSY;
1279
1280        platform_set_drvdata(pdev, xordev);
1281
1282        /*
1283         * (Re-)program MBUS remapping windows if we are asked to.
1284         */
1285        dram = mv_mbus_dram_info();
1286        if (dram)
1287                mv_xor_conf_mbus_windows(xordev, dram);
1288
1289        /* Not all platforms can gate the clock, so it is not
1290         * an error if the clock does not exists.
1291         */
1292        xordev->clk = clk_get(&pdev->dev, NULL);
1293        if (!IS_ERR(xordev->clk))
1294                clk_prepare_enable(xordev->clk);
1295
1296        if (pdev->dev.of_node) {
1297                struct device_node *np;
1298                int i = 0;
1299
1300                for_each_child_of_node(pdev->dev.of_node, np) {
1301                        dma_cap_mask_t cap_mask;
1302                        int irq;
1303
1304                        dma_cap_zero(cap_mask);
1305                        if (of_property_read_bool(np, "dmacap,memcpy"))
1306                                dma_cap_set(DMA_MEMCPY, cap_mask);
1307                        if (of_property_read_bool(np, "dmacap,xor"))
1308                                dma_cap_set(DMA_XOR, cap_mask);
1309                        if (of_property_read_bool(np, "dmacap,memset"))
1310                                dma_cap_set(DMA_MEMSET, cap_mask);
1311                        if (of_property_read_bool(np, "dmacap,interrupt"))
1312                                dma_cap_set(DMA_INTERRUPT, cap_mask);
1313
1314                        irq = irq_of_parse_and_map(np, 0);
1315                        if (!irq) {
1316                                ret = -ENODEV;
1317                                goto err_channel_add;
1318                        }
1319
1320                        xordev->channels[i] =
1321                                mv_xor_channel_add(xordev, pdev, i,
1322                                                   cap_mask, irq);
1323                        if (IS_ERR(xordev->channels[i])) {
1324                                ret = PTR_ERR(xordev->channels[i]);
1325                                xordev->channels[i] = NULL;
1326                                irq_dispose_mapping(irq);
1327                                goto err_channel_add;
1328                        }
1329
1330                        i++;
1331                }
1332        } else if (pdata && pdata->channels) {
1333                for (i = 0; i < MV_XOR_MAX_CHANNELS; i++) {
1334                        struct mv_xor_channel_data *cd;
1335                        int irq;
1336
1337                        cd = &pdata->channels[i];
1338                        if (!cd) {
1339                                ret = -ENODEV;
1340                                goto err_channel_add;
1341                        }
1342
1343                        irq = platform_get_irq(pdev, i);
1344                        if (irq < 0) {
1345                                ret = irq;
1346                                goto err_channel_add;
1347                        }
1348
1349                        xordev->channels[i] =
1350                                mv_xor_channel_add(xordev, pdev, i,
1351                                                   cd->cap_mask, irq);
1352                        if (IS_ERR(xordev->channels[i])) {
1353                                ret = PTR_ERR(xordev->channels[i]);
1354                                goto err_channel_add;
1355                        }
1356                }
1357        }
1358
1359        return 0;
1360
1361err_channel_add:
1362        for (i = 0; i < MV_XOR_MAX_CHANNELS; i++)
1363                if (xordev->channels[i]) {
1364                        mv_xor_channel_remove(xordev->channels[i]);
1365                        if (pdev->dev.of_node)
1366                                irq_dispose_mapping(xordev->channels[i]->irq);
1367                }
1368
1369        if (!IS_ERR(xordev->clk)) {
1370                clk_disable_unprepare(xordev->clk);
1371                clk_put(xordev->clk);
1372        }
1373
1374        return ret;
1375}
1376
1377static int mv_xor_remove(struct platform_device *pdev)
1378{
1379        struct mv_xor_device *xordev = platform_get_drvdata(pdev);
1380        int i;
1381
1382        for (i = 0; i < MV_XOR_MAX_CHANNELS; i++) {
1383                if (xordev->channels[i])
1384                        mv_xor_channel_remove(xordev->channels[i]);
1385        }
1386
1387        if (!IS_ERR(xordev->clk)) {
1388                clk_disable_unprepare(xordev->clk);
1389                clk_put(xordev->clk);
1390        }
1391
1392        return 0;
1393}
1394
1395#ifdef CONFIG_OF
1396static struct of_device_id mv_xor_dt_ids[] = {
1397       { .compatible = "marvell,orion-xor", },
1398       {},
1399};
1400MODULE_DEVICE_TABLE(of, mv_xor_dt_ids);
1401#endif
1402
1403static struct platform_driver mv_xor_driver = {
1404        .probe          = mv_xor_probe,
1405        .remove         = mv_xor_remove,
1406        .driver         = {
1407                .owner          = THIS_MODULE,
1408                .name           = MV_XOR_NAME,
1409                .of_match_table = of_match_ptr(mv_xor_dt_ids),
1410        },
1411};
1412
1413
1414static int __init mv_xor_init(void)
1415{
1416        return platform_driver_register(&mv_xor_driver);
1417}
1418module_init(mv_xor_init);
1419
1420/* it's currently unsafe to unload this module */
1421#if 0
1422static void __exit mv_xor_exit(void)
1423{
1424        platform_driver_unregister(&mv_xor_driver);
1425        return;
1426}
1427
1428module_exit(mv_xor_exit);
1429#endif
1430
1431MODULE_AUTHOR("Saeed Bishara <saeed@marvell.com>");
1432MODULE_DESCRIPTION("DMA engine driver for Marvell's XOR engine");
1433MODULE_LICENSE("GPL");
1434
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