linux/drivers/ata/libahci.c
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   1/*
   2 *  libahci.c - Common AHCI SATA low-level routines
   3 *
   4 *  Maintained by:  Tejun Heo <tj@kernel.org>
   5 *                  Please ALWAYS copy linux-ide@vger.kernel.org
   6 *                  on emails.
   7 *
   8 *  Copyright 2004-2005 Red Hat, Inc.
   9 *
  10 *
  11 *  This program is free software; you can redistribute it and/or modify
  12 *  it under the terms of the GNU General Public License as published by
  13 *  the Free Software Foundation; either version 2, or (at your option)
  14 *  any later version.
  15 *
  16 *  This program is distributed in the hope that it will be useful,
  17 *  but WITHOUT ANY WARRANTY; without even the implied warranty of
  18 *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  19 *  GNU General Public License for more details.
  20 *
  21 *  You should have received a copy of the GNU General Public License
  22 *  along with this program; see the file COPYING.  If not, write to
  23 *  the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA.
  24 *
  25 *
  26 * libata documentation is available via 'make {ps|pdf}docs',
  27 * as Documentation/DocBook/libata.*
  28 *
  29 * AHCI hardware documentation:
  30 * http://www.intel.com/technology/serialata/pdf/rev1_0.pdf
  31 * http://www.intel.com/technology/serialata/pdf/rev1_1.pdf
  32 *
  33 */
  34
  35#include <linux/kernel.h>
  36#include <linux/gfp.h>
  37#include <linux/module.h>
  38#include <linux/init.h>
  39#include <linux/blkdev.h>
  40#include <linux/delay.h>
  41#include <linux/interrupt.h>
  42#include <linux/dma-mapping.h>
  43#include <linux/device.h>
  44#include <scsi/scsi_host.h>
  45#include <scsi/scsi_cmnd.h>
  46#include <linux/libata.h>
  47#include "ahci.h"
  48#include "libata.h"
  49
  50static int ahci_skip_host_reset;
  51int ahci_ignore_sss;
  52EXPORT_SYMBOL_GPL(ahci_ignore_sss);
  53
  54module_param_named(skip_host_reset, ahci_skip_host_reset, int, 0444);
  55MODULE_PARM_DESC(skip_host_reset, "skip global host reset (0=don't skip, 1=skip)");
  56
  57module_param_named(ignore_sss, ahci_ignore_sss, int, 0444);
  58MODULE_PARM_DESC(ignore_sss, "Ignore staggered spinup flag (0=don't ignore, 1=ignore)");
  59
  60static int ahci_set_lpm(struct ata_link *link, enum ata_lpm_policy policy,
  61                        unsigned hints);
  62static ssize_t ahci_led_show(struct ata_port *ap, char *buf);
  63static ssize_t ahci_led_store(struct ata_port *ap, const char *buf,
  64                              size_t size);
  65static ssize_t ahci_transmit_led_message(struct ata_port *ap, u32 state,
  66                                        ssize_t size);
  67
  68
  69
  70static int ahci_scr_read(struct ata_link *link, unsigned int sc_reg, u32 *val);
  71static int ahci_scr_write(struct ata_link *link, unsigned int sc_reg, u32 val);
  72static unsigned int ahci_qc_issue(struct ata_queued_cmd *qc);
  73static bool ahci_qc_fill_rtf(struct ata_queued_cmd *qc);
  74static int ahci_port_start(struct ata_port *ap);
  75static void ahci_port_stop(struct ata_port *ap);
  76static void ahci_qc_prep(struct ata_queued_cmd *qc);
  77static int ahci_pmp_qc_defer(struct ata_queued_cmd *qc);
  78static void ahci_freeze(struct ata_port *ap);
  79static void ahci_thaw(struct ata_port *ap);
  80static void ahci_set_aggressive_devslp(struct ata_port *ap, bool sleep);
  81static void ahci_enable_fbs(struct ata_port *ap);
  82static void ahci_disable_fbs(struct ata_port *ap);
  83static void ahci_pmp_attach(struct ata_port *ap);
  84static void ahci_pmp_detach(struct ata_port *ap);
  85static int ahci_softreset(struct ata_link *link, unsigned int *class,
  86                          unsigned long deadline);
  87static int ahci_pmp_retry_softreset(struct ata_link *link, unsigned int *class,
  88                          unsigned long deadline);
  89static int ahci_hardreset(struct ata_link *link, unsigned int *class,
  90                          unsigned long deadline);
  91static void ahci_postreset(struct ata_link *link, unsigned int *class);
  92static void ahci_error_handler(struct ata_port *ap);
  93static void ahci_post_internal_cmd(struct ata_queued_cmd *qc);
  94static void ahci_dev_config(struct ata_device *dev);
  95#ifdef CONFIG_PM
  96static int ahci_port_suspend(struct ata_port *ap, pm_message_t mesg);
  97#endif
  98static ssize_t ahci_activity_show(struct ata_device *dev, char *buf);
  99static ssize_t ahci_activity_store(struct ata_device *dev,
 100                                   enum sw_activity val);
 101static void ahci_init_sw_activity(struct ata_link *link);
 102
 103static ssize_t ahci_show_host_caps(struct device *dev,
 104                                   struct device_attribute *attr, char *buf);
 105static ssize_t ahci_show_host_cap2(struct device *dev,
 106                                   struct device_attribute *attr, char *buf);
 107static ssize_t ahci_show_host_version(struct device *dev,
 108                                      struct device_attribute *attr, char *buf);
 109static ssize_t ahci_show_port_cmd(struct device *dev,
 110                                  struct device_attribute *attr, char *buf);
 111static ssize_t ahci_read_em_buffer(struct device *dev,
 112                                   struct device_attribute *attr, char *buf);
 113static ssize_t ahci_store_em_buffer(struct device *dev,
 114                                    struct device_attribute *attr,
 115                                    const char *buf, size_t size);
 116static ssize_t ahci_show_em_supported(struct device *dev,
 117                                      struct device_attribute *attr, char *buf);
 118
 119static DEVICE_ATTR(ahci_host_caps, S_IRUGO, ahci_show_host_caps, NULL);
 120static DEVICE_ATTR(ahci_host_cap2, S_IRUGO, ahci_show_host_cap2, NULL);
 121static DEVICE_ATTR(ahci_host_version, S_IRUGO, ahci_show_host_version, NULL);
 122static DEVICE_ATTR(ahci_port_cmd, S_IRUGO, ahci_show_port_cmd, NULL);
 123static DEVICE_ATTR(em_buffer, S_IWUSR | S_IRUGO,
 124                   ahci_read_em_buffer, ahci_store_em_buffer);
 125static DEVICE_ATTR(em_message_supported, S_IRUGO, ahci_show_em_supported, NULL);
 126
 127struct device_attribute *ahci_shost_attrs[] = {
 128        &dev_attr_link_power_management_policy,
 129        &dev_attr_em_message_type,
 130        &dev_attr_em_message,
 131        &dev_attr_ahci_host_caps,
 132        &dev_attr_ahci_host_cap2,
 133        &dev_attr_ahci_host_version,
 134        &dev_attr_ahci_port_cmd,
 135        &dev_attr_em_buffer,
 136        &dev_attr_em_message_supported,
 137        NULL
 138};
 139EXPORT_SYMBOL_GPL(ahci_shost_attrs);
 140
 141struct device_attribute *ahci_sdev_attrs[] = {
 142        &dev_attr_sw_activity,
 143        &dev_attr_unload_heads,
 144        NULL
 145};
 146EXPORT_SYMBOL_GPL(ahci_sdev_attrs);
 147
 148struct ata_port_operations ahci_ops = {
 149        .inherits               = &sata_pmp_port_ops,
 150
 151        .qc_defer               = ahci_pmp_qc_defer,
 152        .qc_prep                = ahci_qc_prep,
 153        .qc_issue               = ahci_qc_issue,
 154        .qc_fill_rtf            = ahci_qc_fill_rtf,
 155
 156        .freeze                 = ahci_freeze,
 157        .thaw                   = ahci_thaw,
 158        .softreset              = ahci_softreset,
 159        .hardreset              = ahci_hardreset,
 160        .postreset              = ahci_postreset,
 161        .pmp_softreset          = ahci_softreset,
 162        .error_handler          = ahci_error_handler,
 163        .post_internal_cmd      = ahci_post_internal_cmd,
 164        .dev_config             = ahci_dev_config,
 165
 166        .scr_read               = ahci_scr_read,
 167        .scr_write              = ahci_scr_write,
 168        .pmp_attach             = ahci_pmp_attach,
 169        .pmp_detach             = ahci_pmp_detach,
 170
 171        .set_lpm                = ahci_set_lpm,
 172        .em_show                = ahci_led_show,
 173        .em_store               = ahci_led_store,
 174        .sw_activity_show       = ahci_activity_show,
 175        .sw_activity_store      = ahci_activity_store,
 176#ifdef CONFIG_PM
 177        .port_suspend           = ahci_port_suspend,
 178        .port_resume            = ahci_port_resume,
 179#endif
 180        .port_start             = ahci_port_start,
 181        .port_stop              = ahci_port_stop,
 182};
 183EXPORT_SYMBOL_GPL(ahci_ops);
 184
 185struct ata_port_operations ahci_pmp_retry_srst_ops = {
 186        .inherits               = &ahci_ops,
 187        .softreset              = ahci_pmp_retry_softreset,
 188};
 189EXPORT_SYMBOL_GPL(ahci_pmp_retry_srst_ops);
 190
 191int ahci_em_messages = 1;
 192EXPORT_SYMBOL_GPL(ahci_em_messages);
 193module_param(ahci_em_messages, int, 0444);
 194/* add other LED protocol types when they become supported */
 195MODULE_PARM_DESC(ahci_em_messages,
 196        "AHCI Enclosure Management Message control (0 = off, 1 = on)");
 197
 198int devslp_idle_timeout = 1000; /* device sleep idle timeout in ms */
 199module_param(devslp_idle_timeout, int, 0644);
 200MODULE_PARM_DESC(devslp_idle_timeout, "device sleep idle timeout");
 201
 202static void ahci_enable_ahci(void __iomem *mmio)
 203{
 204        int i;
 205        u32 tmp;
 206
 207        /* turn on AHCI_EN */
 208        tmp = readl(mmio + HOST_CTL);
 209        if (tmp & HOST_AHCI_EN)
 210                return;
 211
 212        /* Some controllers need AHCI_EN to be written multiple times.
 213         * Try a few times before giving up.
 214         */
 215        for (i = 0; i < 5; i++) {
 216                tmp |= HOST_AHCI_EN;
 217                writel(tmp, mmio + HOST_CTL);
 218                tmp = readl(mmio + HOST_CTL);   /* flush && sanity check */
 219                if (tmp & HOST_AHCI_EN)
 220                        return;
 221                msleep(10);
 222        }
 223
 224        WARN_ON(1);
 225}
 226
 227static ssize_t ahci_show_host_caps(struct device *dev,
 228                                   struct device_attribute *attr, char *buf)
 229{
 230        struct Scsi_Host *shost = class_to_shost(dev);
 231        struct ata_port *ap = ata_shost_to_port(shost);
 232        struct ahci_host_priv *hpriv = ap->host->private_data;
 233
 234        return sprintf(buf, "%x\n", hpriv->cap);
 235}
 236
 237static ssize_t ahci_show_host_cap2(struct device *dev,
 238                                   struct device_attribute *attr, char *buf)
 239{
 240        struct Scsi_Host *shost = class_to_shost(dev);
 241        struct ata_port *ap = ata_shost_to_port(shost);
 242        struct ahci_host_priv *hpriv = ap->host->private_data;
 243
 244        return sprintf(buf, "%x\n", hpriv->cap2);
 245}
 246
 247static ssize_t ahci_show_host_version(struct device *dev,
 248                                   struct device_attribute *attr, char *buf)
 249{
 250        struct Scsi_Host *shost = class_to_shost(dev);
 251        struct ata_port *ap = ata_shost_to_port(shost);
 252        struct ahci_host_priv *hpriv = ap->host->private_data;
 253        void __iomem *mmio = hpriv->mmio;
 254
 255        return sprintf(buf, "%x\n", readl(mmio + HOST_VERSION));
 256}
 257
 258static ssize_t ahci_show_port_cmd(struct device *dev,
 259                                  struct device_attribute *attr, char *buf)
 260{
 261        struct Scsi_Host *shost = class_to_shost(dev);
 262        struct ata_port *ap = ata_shost_to_port(shost);
 263        void __iomem *port_mmio = ahci_port_base(ap);
 264
 265        return sprintf(buf, "%x\n", readl(port_mmio + PORT_CMD));
 266}
 267
 268static ssize_t ahci_read_em_buffer(struct device *dev,
 269                                   struct device_attribute *attr, char *buf)
 270{
 271        struct Scsi_Host *shost = class_to_shost(dev);
 272        struct ata_port *ap = ata_shost_to_port(shost);
 273        struct ahci_host_priv *hpriv = ap->host->private_data;
 274        void __iomem *mmio = hpriv->mmio;
 275        void __iomem *em_mmio = mmio + hpriv->em_loc;
 276        u32 em_ctl, msg;
 277        unsigned long flags;
 278        size_t count;
 279        int i;
 280
 281        spin_lock_irqsave(ap->lock, flags);
 282
 283        em_ctl = readl(mmio + HOST_EM_CTL);
 284        if (!(ap->flags & ATA_FLAG_EM) || em_ctl & EM_CTL_XMT ||
 285            !(hpriv->em_msg_type & EM_MSG_TYPE_SGPIO)) {
 286                spin_unlock_irqrestore(ap->lock, flags);
 287                return -EINVAL;
 288        }
 289
 290        if (!(em_ctl & EM_CTL_MR)) {
 291                spin_unlock_irqrestore(ap->lock, flags);
 292                return -EAGAIN;
 293        }
 294
 295        if (!(em_ctl & EM_CTL_SMB))
 296                em_mmio += hpriv->em_buf_sz;
 297
 298        count = hpriv->em_buf_sz;
 299
 300        /* the count should not be larger than PAGE_SIZE */
 301        if (count > PAGE_SIZE) {
 302                if (printk_ratelimit())
 303                        ata_port_warn(ap,
 304                                      "EM read buffer size too large: "
 305                                      "buffer size %u, page size %lu\n",
 306                                      hpriv->em_buf_sz, PAGE_SIZE);
 307                count = PAGE_SIZE;
 308        }
 309
 310        for (i = 0; i < count; i += 4) {
 311                msg = readl(em_mmio + i);
 312                buf[i] = msg & 0xff;
 313                buf[i + 1] = (msg >> 8) & 0xff;
 314                buf[i + 2] = (msg >> 16) & 0xff;
 315                buf[i + 3] = (msg >> 24) & 0xff;
 316        }
 317
 318        spin_unlock_irqrestore(ap->lock, flags);
 319
 320        return i;
 321}
 322
 323static ssize_t ahci_store_em_buffer(struct device *dev,
 324                                    struct device_attribute *attr,
 325                                    const char *buf, size_t size)
 326{
 327        struct Scsi_Host *shost = class_to_shost(dev);
 328        struct ata_port *ap = ata_shost_to_port(shost);
 329        struct ahci_host_priv *hpriv = ap->host->private_data;
 330        void __iomem *mmio = hpriv->mmio;
 331        void __iomem *em_mmio = mmio + hpriv->em_loc;
 332        const unsigned char *msg_buf = buf;
 333        u32 em_ctl, msg;
 334        unsigned long flags;
 335        int i;
 336
 337        /* check size validity */
 338        if (!(ap->flags & ATA_FLAG_EM) ||
 339            !(hpriv->em_msg_type & EM_MSG_TYPE_SGPIO) ||
 340            size % 4 || size > hpriv->em_buf_sz)
 341                return -EINVAL;
 342
 343        spin_lock_irqsave(ap->lock, flags);
 344
 345        em_ctl = readl(mmio + HOST_EM_CTL);
 346        if (em_ctl & EM_CTL_TM) {
 347                spin_unlock_irqrestore(ap->lock, flags);
 348                return -EBUSY;
 349        }
 350
 351        for (i = 0; i < size; i += 4) {
 352                msg = msg_buf[i] | msg_buf[i + 1] << 8 |
 353                      msg_buf[i + 2] << 16 | msg_buf[i + 3] << 24;
 354                writel(msg, em_mmio + i);
 355        }
 356
 357        writel(em_ctl | EM_CTL_TM, mmio + HOST_EM_CTL);
 358
 359        spin_unlock_irqrestore(ap->lock, flags);
 360
 361        return size;
 362}
 363
 364static ssize_t ahci_show_em_supported(struct device *dev,
 365                                      struct device_attribute *attr, char *buf)
 366{
 367        struct Scsi_Host *shost = class_to_shost(dev);
 368        struct ata_port *ap = ata_shost_to_port(shost);
 369        struct ahci_host_priv *hpriv = ap->host->private_data;
 370        void __iomem *mmio = hpriv->mmio;
 371        u32 em_ctl;
 372
 373        em_ctl = readl(mmio + HOST_EM_CTL);
 374
 375        return sprintf(buf, "%s%s%s%s\n",
 376                       em_ctl & EM_CTL_LED ? "led " : "",
 377                       em_ctl & EM_CTL_SAFTE ? "saf-te " : "",
 378                       em_ctl & EM_CTL_SES ? "ses-2 " : "",
 379                       em_ctl & EM_CTL_SGPIO ? "sgpio " : "");
 380}
 381
 382/**
 383 *      ahci_save_initial_config - Save and fixup initial config values
 384 *      @dev: target AHCI device
 385 *      @hpriv: host private area to store config values
 386 *      @force_port_map: force port map to a specified value
 387 *      @mask_port_map: mask out particular bits from port map
 388 *
 389 *      Some registers containing configuration info might be setup by
 390 *      BIOS and might be cleared on reset.  This function saves the
 391 *      initial values of those registers into @hpriv such that they
 392 *      can be restored after controller reset.
 393 *
 394 *      If inconsistent, config values are fixed up by this function.
 395 *
 396 *      LOCKING:
 397 *      None.
 398 */
 399void ahci_save_initial_config(struct device *dev,
 400                              struct ahci_host_priv *hpriv,
 401                              unsigned int force_port_map,
 402                              unsigned int mask_port_map)
 403{
 404        void __iomem *mmio = hpriv->mmio;
 405        u32 cap, cap2, vers, port_map;
 406        int i;
 407
 408        /* make sure AHCI mode is enabled before accessing CAP */
 409        ahci_enable_ahci(mmio);
 410
 411        /* Values prefixed with saved_ are written back to host after
 412         * reset.  Values without are used for driver operation.
 413         */
 414        hpriv->saved_cap = cap = readl(mmio + HOST_CAP);
 415        hpriv->saved_port_map = port_map = readl(mmio + HOST_PORTS_IMPL);
 416
 417        /* CAP2 register is only defined for AHCI 1.2 and later */
 418        vers = readl(mmio + HOST_VERSION);
 419        if ((vers >> 16) > 1 ||
 420           ((vers >> 16) == 1 && (vers & 0xFFFF) >= 0x200))
 421                hpriv->saved_cap2 = cap2 = readl(mmio + HOST_CAP2);
 422        else
 423                hpriv->saved_cap2 = cap2 = 0;
 424
 425        /* some chips have errata preventing 64bit use */
 426        if ((cap & HOST_CAP_64) && (hpriv->flags & AHCI_HFLAG_32BIT_ONLY)) {
 427                dev_info(dev, "controller can't do 64bit DMA, forcing 32bit\n");
 428                cap &= ~HOST_CAP_64;
 429        }
 430
 431        if ((cap & HOST_CAP_NCQ) && (hpriv->flags & AHCI_HFLAG_NO_NCQ)) {
 432                dev_info(dev, "controller can't do NCQ, turning off CAP_NCQ\n");
 433                cap &= ~HOST_CAP_NCQ;
 434        }
 435
 436        if (!(cap & HOST_CAP_NCQ) && (hpriv->flags & AHCI_HFLAG_YES_NCQ)) {
 437                dev_info(dev, "controller can do NCQ, turning on CAP_NCQ\n");
 438                cap |= HOST_CAP_NCQ;
 439        }
 440
 441        if ((cap & HOST_CAP_PMP) && (hpriv->flags & AHCI_HFLAG_NO_PMP)) {
 442                dev_info(dev, "controller can't do PMP, turning off CAP_PMP\n");
 443                cap &= ~HOST_CAP_PMP;
 444        }
 445
 446        if ((cap & HOST_CAP_SNTF) && (hpriv->flags & AHCI_HFLAG_NO_SNTF)) {
 447                dev_info(dev,
 448                         "controller can't do SNTF, turning off CAP_SNTF\n");
 449                cap &= ~HOST_CAP_SNTF;
 450        }
 451
 452        if (!(cap & HOST_CAP_FBS) && (hpriv->flags & AHCI_HFLAG_YES_FBS)) {
 453                dev_info(dev, "controller can do FBS, turning on CAP_FBS\n");
 454                cap |= HOST_CAP_FBS;
 455        }
 456
 457        if (force_port_map && port_map != force_port_map) {
 458                dev_info(dev, "forcing port_map 0x%x -> 0x%x\n",
 459                         port_map, force_port_map);
 460                port_map = force_port_map;
 461        }
 462
 463        if (mask_port_map) {
 464                dev_warn(dev, "masking port_map 0x%x -> 0x%x\n",
 465                        port_map,
 466                        port_map & mask_port_map);
 467                port_map &= mask_port_map;
 468        }
 469
 470        /* cross check port_map and cap.n_ports */
 471        if (port_map) {
 472                int map_ports = 0;
 473
 474                for (i = 0; i < AHCI_MAX_PORTS; i++)
 475                        if (port_map & (1 << i))
 476                                map_ports++;
 477
 478                /* If PI has more ports than n_ports, whine, clear
 479                 * port_map and let it be generated from n_ports.
 480                 */
 481                if (map_ports > ahci_nr_ports(cap)) {
 482                        dev_warn(dev,
 483                                 "implemented port map (0x%x) contains more ports than nr_ports (%u), using nr_ports\n",
 484                                 port_map, ahci_nr_ports(cap));
 485                        port_map = 0;
 486                }
 487        }
 488
 489        /* fabricate port_map from cap.nr_ports */
 490        if (!port_map) {
 491                port_map = (1 << ahci_nr_ports(cap)) - 1;
 492                dev_warn(dev, "forcing PORTS_IMPL to 0x%x\n", port_map);
 493
 494                /* write the fixed up value to the PI register */
 495                hpriv->saved_port_map = port_map;
 496        }
 497
 498        /* record values to use during operation */
 499        hpriv->cap = cap;
 500        hpriv->cap2 = cap2;
 501        hpriv->port_map = port_map;
 502}
 503EXPORT_SYMBOL_GPL(ahci_save_initial_config);
 504
 505/**
 506 *      ahci_restore_initial_config - Restore initial config
 507 *      @host: target ATA host
 508 *
 509 *      Restore initial config stored by ahci_save_initial_config().
 510 *
 511 *      LOCKING:
 512 *      None.
 513 */
 514static void ahci_restore_initial_config(struct ata_host *host)
 515{
 516        struct ahci_host_priv *hpriv = host->private_data;
 517        void __iomem *mmio = hpriv->mmio;
 518
 519        writel(hpriv->saved_cap, mmio + HOST_CAP);
 520        if (hpriv->saved_cap2)
 521                writel(hpriv->saved_cap2, mmio + HOST_CAP2);
 522        writel(hpriv->saved_port_map, mmio + HOST_PORTS_IMPL);
 523        (void) readl(mmio + HOST_PORTS_IMPL);   /* flush */
 524}
 525
 526static unsigned ahci_scr_offset(struct ata_port *ap, unsigned int sc_reg)
 527{
 528        static const int offset[] = {
 529                [SCR_STATUS]            = PORT_SCR_STAT,
 530                [SCR_CONTROL]           = PORT_SCR_CTL,
 531                [SCR_ERROR]             = PORT_SCR_ERR,
 532                [SCR_ACTIVE]            = PORT_SCR_ACT,
 533                [SCR_NOTIFICATION]      = PORT_SCR_NTF,
 534        };
 535        struct ahci_host_priv *hpriv = ap->host->private_data;
 536
 537        if (sc_reg < ARRAY_SIZE(offset) &&
 538            (sc_reg != SCR_NOTIFICATION || (hpriv->cap & HOST_CAP_SNTF)))
 539                return offset[sc_reg];
 540        return 0;
 541}
 542
 543static int ahci_scr_read(struct ata_link *link, unsigned int sc_reg, u32 *val)
 544{
 545        void __iomem *port_mmio = ahci_port_base(link->ap);
 546        int offset = ahci_scr_offset(link->ap, sc_reg);
 547
 548        if (offset) {
 549                *val = readl(port_mmio + offset);
 550                return 0;
 551        }
 552        return -EINVAL;
 553}
 554
 555static int ahci_scr_write(struct ata_link *link, unsigned int sc_reg, u32 val)
 556{
 557        void __iomem *port_mmio = ahci_port_base(link->ap);
 558        int offset = ahci_scr_offset(link->ap, sc_reg);
 559
 560        if (offset) {
 561                writel(val, port_mmio + offset);
 562                return 0;
 563        }
 564        return -EINVAL;
 565}
 566
 567void ahci_start_engine(struct ata_port *ap)
 568{
 569        void __iomem *port_mmio = ahci_port_base(ap);
 570        u32 tmp;
 571
 572        /* start DMA */
 573        tmp = readl(port_mmio + PORT_CMD);
 574        tmp |= PORT_CMD_START;
 575        writel(tmp, port_mmio + PORT_CMD);
 576        readl(port_mmio + PORT_CMD); /* flush */
 577}
 578EXPORT_SYMBOL_GPL(ahci_start_engine);
 579
 580int ahci_stop_engine(struct ata_port *ap)
 581{
 582        void __iomem *port_mmio = ahci_port_base(ap);
 583        u32 tmp;
 584
 585        tmp = readl(port_mmio + PORT_CMD);
 586
 587        /* check if the HBA is idle */
 588        if ((tmp & (PORT_CMD_START | PORT_CMD_LIST_ON)) == 0)
 589                return 0;
 590
 591        /* setting HBA to idle */
 592        tmp &= ~PORT_CMD_START;
 593        writel(tmp, port_mmio + PORT_CMD);
 594
 595        /* wait for engine to stop. This could be as long as 500 msec */
 596        tmp = ata_wait_register(ap, port_mmio + PORT_CMD,
 597                                PORT_CMD_LIST_ON, PORT_CMD_LIST_ON, 1, 500);
 598        if (tmp & PORT_CMD_LIST_ON)
 599                return -EIO;
 600
 601        return 0;
 602}
 603EXPORT_SYMBOL_GPL(ahci_stop_engine);
 604
 605static void ahci_start_fis_rx(struct ata_port *ap)
 606{
 607        void __iomem *port_mmio = ahci_port_base(ap);
 608        struct ahci_host_priv *hpriv = ap->host->private_data;
 609        struct ahci_port_priv *pp = ap->private_data;
 610        u32 tmp;
 611
 612        /* set FIS registers */
 613        if (hpriv->cap & HOST_CAP_64)
 614                writel((pp->cmd_slot_dma >> 16) >> 16,
 615                       port_mmio + PORT_LST_ADDR_HI);
 616        writel(pp->cmd_slot_dma & 0xffffffff, port_mmio + PORT_LST_ADDR);
 617
 618        if (hpriv->cap & HOST_CAP_64)
 619                writel((pp->rx_fis_dma >> 16) >> 16,
 620                       port_mmio + PORT_FIS_ADDR_HI);
 621        writel(pp->rx_fis_dma & 0xffffffff, port_mmio + PORT_FIS_ADDR);
 622
 623        /* enable FIS reception */
 624        tmp = readl(port_mmio + PORT_CMD);
 625        tmp |= PORT_CMD_FIS_RX;
 626        writel(tmp, port_mmio + PORT_CMD);
 627
 628        /* flush */
 629        readl(port_mmio + PORT_CMD);
 630}
 631
 632static int ahci_stop_fis_rx(struct ata_port *ap)
 633{
 634        void __iomem *port_mmio = ahci_port_base(ap);
 635        u32 tmp;
 636
 637        /* disable FIS reception */
 638        tmp = readl(port_mmio + PORT_CMD);
 639        tmp &= ~PORT_CMD_FIS_RX;
 640        writel(tmp, port_mmio + PORT_CMD);
 641
 642        /* wait for completion, spec says 500ms, give it 1000 */
 643        tmp = ata_wait_register(ap, port_mmio + PORT_CMD, PORT_CMD_FIS_ON,
 644                                PORT_CMD_FIS_ON, 10, 1000);
 645        if (tmp & PORT_CMD_FIS_ON)
 646                return -EBUSY;
 647
 648        return 0;
 649}
 650
 651static void ahci_power_up(struct ata_port *ap)
 652{
 653        struct ahci_host_priv *hpriv = ap->host->private_data;
 654        void __iomem *port_mmio = ahci_port_base(ap);
 655        u32 cmd;
 656
 657        cmd = readl(port_mmio + PORT_CMD) & ~PORT_CMD_ICC_MASK;
 658
 659        /* spin up device */
 660        if (hpriv->cap & HOST_CAP_SSS) {
 661                cmd |= PORT_CMD_SPIN_UP;
 662                writel(cmd, port_mmio + PORT_CMD);
 663        }
 664
 665        /* wake up link */
 666        writel(cmd | PORT_CMD_ICC_ACTIVE, port_mmio + PORT_CMD);
 667}
 668
 669static int ahci_set_lpm(struct ata_link *link, enum ata_lpm_policy policy,
 670                        unsigned int hints)
 671{
 672        struct ata_port *ap = link->ap;
 673        struct ahci_host_priv *hpriv = ap->host->private_data;
 674        struct ahci_port_priv *pp = ap->private_data;
 675        void __iomem *port_mmio = ahci_port_base(ap);
 676
 677        if (policy != ATA_LPM_MAX_POWER) {
 678                /*
 679                 * Disable interrupts on Phy Ready. This keeps us from
 680                 * getting woken up due to spurious phy ready
 681                 * interrupts.
 682                 */
 683                pp->intr_mask &= ~PORT_IRQ_PHYRDY;
 684                writel(pp->intr_mask, port_mmio + PORT_IRQ_MASK);
 685
 686                sata_link_scr_lpm(link, policy, false);
 687        }
 688
 689        if (hpriv->cap & HOST_CAP_ALPM) {
 690                u32 cmd = readl(port_mmio + PORT_CMD);
 691
 692                if (policy == ATA_LPM_MAX_POWER || !(hints & ATA_LPM_HIPM)) {
 693                        cmd &= ~(PORT_CMD_ASP | PORT_CMD_ALPE);
 694                        cmd |= PORT_CMD_ICC_ACTIVE;
 695
 696                        writel(cmd, port_mmio + PORT_CMD);
 697                        readl(port_mmio + PORT_CMD);
 698
 699                        /* wait 10ms to be sure we've come out of LPM state */
 700                        ata_msleep(ap, 10);
 701                } else {
 702                        cmd |= PORT_CMD_ALPE;
 703                        if (policy == ATA_LPM_MIN_POWER)
 704                                cmd |= PORT_CMD_ASP;
 705
 706                        /* write out new cmd value */
 707                        writel(cmd, port_mmio + PORT_CMD);
 708                }
 709        }
 710
 711        /* set aggressive device sleep */
 712        if ((hpriv->cap2 & HOST_CAP2_SDS) &&
 713            (hpriv->cap2 & HOST_CAP2_SADM) &&
 714            (link->device->flags & ATA_DFLAG_DEVSLP)) {
 715                if (policy == ATA_LPM_MIN_POWER)
 716                        ahci_set_aggressive_devslp(ap, true);
 717                else
 718                        ahci_set_aggressive_devslp(ap, false);
 719        }
 720
 721        if (policy == ATA_LPM_MAX_POWER) {
 722                sata_link_scr_lpm(link, policy, false);
 723
 724                /* turn PHYRDY IRQ back on */
 725                pp->intr_mask |= PORT_IRQ_PHYRDY;
 726                writel(pp->intr_mask, port_mmio + PORT_IRQ_MASK);
 727        }
 728
 729        return 0;
 730}
 731
 732#ifdef CONFIG_PM
 733static void ahci_power_down(struct ata_port *ap)
 734{
 735        struct ahci_host_priv *hpriv = ap->host->private_data;
 736        void __iomem *port_mmio = ahci_port_base(ap);
 737        u32 cmd, scontrol;
 738
 739        if (!(hpriv->cap & HOST_CAP_SSS))
 740                return;
 741
 742        /* put device into listen mode, first set PxSCTL.DET to 0 */
 743        scontrol = readl(port_mmio + PORT_SCR_CTL);
 744        scontrol &= ~0xf;
 745        writel(scontrol, port_mmio + PORT_SCR_CTL);
 746
 747        /* then set PxCMD.SUD to 0 */
 748        cmd = readl(port_mmio + PORT_CMD) & ~PORT_CMD_ICC_MASK;
 749        cmd &= ~PORT_CMD_SPIN_UP;
 750        writel(cmd, port_mmio + PORT_CMD);
 751}
 752#endif
 753
 754static void ahci_start_port(struct ata_port *ap)
 755{
 756        struct ahci_host_priv *hpriv = ap->host->private_data;
 757        struct ahci_port_priv *pp = ap->private_data;
 758        struct ata_link *link;
 759        struct ahci_em_priv *emp;
 760        ssize_t rc;
 761        int i;
 762
 763        /* enable FIS reception */
 764        ahci_start_fis_rx(ap);
 765
 766        /* enable DMA */
 767        if (!(hpriv->flags & AHCI_HFLAG_DELAY_ENGINE))
 768                ahci_start_engine(ap);
 769
 770        /* turn on LEDs */
 771        if (ap->flags & ATA_FLAG_EM) {
 772                ata_for_each_link(link, ap, EDGE) {
 773                        emp = &pp->em_priv[link->pmp];
 774
 775                        /* EM Transmit bit maybe busy during init */
 776                        for (i = 0; i < EM_MAX_RETRY; i++) {
 777                                rc = ahci_transmit_led_message(ap,
 778                                                               emp->led_state,
 779                                                               4);
 780                                if (rc == -EBUSY)
 781                                        ata_msleep(ap, 1);
 782                                else
 783                                        break;
 784                        }
 785                }
 786        }
 787
 788        if (ap->flags & ATA_FLAG_SW_ACTIVITY)
 789                ata_for_each_link(link, ap, EDGE)
 790                        ahci_init_sw_activity(link);
 791
 792}
 793
 794static int ahci_deinit_port(struct ata_port *ap, const char **emsg)
 795{
 796        int rc;
 797
 798        /* disable DMA */
 799        rc = ahci_stop_engine(ap);
 800        if (rc) {
 801                *emsg = "failed to stop engine";
 802                return rc;
 803        }
 804
 805        /* disable FIS reception */
 806        rc = ahci_stop_fis_rx(ap);
 807        if (rc) {
 808                *emsg = "failed stop FIS RX";
 809                return rc;
 810        }
 811
 812        return 0;
 813}
 814
 815int ahci_reset_controller(struct ata_host *host)
 816{
 817        struct ahci_host_priv *hpriv = host->private_data;
 818        void __iomem *mmio = hpriv->mmio;
 819        u32 tmp;
 820
 821        /* we must be in AHCI mode, before using anything
 822         * AHCI-specific, such as HOST_RESET.
 823         */
 824        ahci_enable_ahci(mmio);
 825
 826        /* global controller reset */
 827        if (!ahci_skip_host_reset) {
 828                tmp = readl(mmio + HOST_CTL);
 829                if ((tmp & HOST_RESET) == 0) {
 830                        writel(tmp | HOST_RESET, mmio + HOST_CTL);
 831                        readl(mmio + HOST_CTL); /* flush */
 832                }
 833
 834                /*
 835                 * to perform host reset, OS should set HOST_RESET
 836                 * and poll until this bit is read to be "0".
 837                 * reset must complete within 1 second, or
 838                 * the hardware should be considered fried.
 839                 */
 840                tmp = ata_wait_register(NULL, mmio + HOST_CTL, HOST_RESET,
 841                                        HOST_RESET, 10, 1000);
 842
 843                if (tmp & HOST_RESET) {
 844                        dev_err(host->dev, "controller reset failed (0x%x)\n",
 845                                tmp);
 846                        return -EIO;
 847                }
 848
 849                /* turn on AHCI mode */
 850                ahci_enable_ahci(mmio);
 851
 852                /* Some registers might be cleared on reset.  Restore
 853                 * initial values.
 854                 */
 855                ahci_restore_initial_config(host);
 856        } else
 857                dev_info(host->dev, "skipping global host reset\n");
 858
 859        return 0;
 860}
 861EXPORT_SYMBOL_GPL(ahci_reset_controller);
 862
 863static void ahci_sw_activity(struct ata_link *link)
 864{
 865        struct ata_port *ap = link->ap;
 866        struct ahci_port_priv *pp = ap->private_data;
 867        struct ahci_em_priv *emp = &pp->em_priv[link->pmp];
 868
 869        if (!(link->flags & ATA_LFLAG_SW_ACTIVITY))
 870                return;
 871
 872        emp->activity++;
 873        if (!timer_pending(&emp->timer))
 874                mod_timer(&emp->timer, jiffies + msecs_to_jiffies(10));
 875}
 876
 877static void ahci_sw_activity_blink(unsigned long arg)
 878{
 879        struct ata_link *link = (struct ata_link *)arg;
 880        struct ata_port *ap = link->ap;
 881        struct ahci_port_priv *pp = ap->private_data;
 882        struct ahci_em_priv *emp = &pp->em_priv[link->pmp];
 883        unsigned long led_message = emp->led_state;
 884        u32 activity_led_state;
 885        unsigned long flags;
 886
 887        led_message &= EM_MSG_LED_VALUE;
 888        led_message |= ap->port_no | (link->pmp << 8);
 889
 890        /* check to see if we've had activity.  If so,
 891         * toggle state of LED and reset timer.  If not,
 892         * turn LED to desired idle state.
 893         */
 894        spin_lock_irqsave(ap->lock, flags);
 895        if (emp->saved_activity != emp->activity) {
 896                emp->saved_activity = emp->activity;
 897                /* get the current LED state */
 898                activity_led_state = led_message & EM_MSG_LED_VALUE_ON;
 899
 900                if (activity_led_state)
 901                        activity_led_state = 0;
 902                else
 903                        activity_led_state = 1;
 904
 905                /* clear old state */
 906                led_message &= ~EM_MSG_LED_VALUE_ACTIVITY;
 907
 908                /* toggle state */
 909                led_message |= (activity_led_state << 16);
 910                mod_timer(&emp->timer, jiffies + msecs_to_jiffies(100));
 911        } else {
 912                /* switch to idle */
 913                led_message &= ~EM_MSG_LED_VALUE_ACTIVITY;
 914                if (emp->blink_policy == BLINK_OFF)
 915                        led_message |= (1 << 16);
 916        }
 917        spin_unlock_irqrestore(ap->lock, flags);
 918        ahci_transmit_led_message(ap, led_message, 4);
 919}
 920
 921static void ahci_init_sw_activity(struct ata_link *link)
 922{
 923        struct ata_port *ap = link->ap;
 924        struct ahci_port_priv *pp = ap->private_data;
 925        struct ahci_em_priv *emp = &pp->em_priv[link->pmp];
 926
 927        /* init activity stats, setup timer */
 928        emp->saved_activity = emp->activity = 0;
 929        setup_timer(&emp->timer, ahci_sw_activity_blink, (unsigned long)link);
 930
 931        /* check our blink policy and set flag for link if it's enabled */
 932        if (emp->blink_policy)
 933                link->flags |= ATA_LFLAG_SW_ACTIVITY;
 934}
 935
 936int ahci_reset_em(struct ata_host *host)
 937{
 938        struct ahci_host_priv *hpriv = host->private_data;
 939        void __iomem *mmio = hpriv->mmio;
 940        u32 em_ctl;
 941
 942        em_ctl = readl(mmio + HOST_EM_CTL);
 943        if ((em_ctl & EM_CTL_TM) || (em_ctl & EM_CTL_RST))
 944                return -EINVAL;
 945
 946        writel(em_ctl | EM_CTL_RST, mmio + HOST_EM_CTL);
 947        return 0;
 948}
 949EXPORT_SYMBOL_GPL(ahci_reset_em);
 950
 951static ssize_t ahci_transmit_led_message(struct ata_port *ap, u32 state,
 952                                        ssize_t size)
 953{
 954        struct ahci_host_priv *hpriv = ap->host->private_data;
 955        struct ahci_port_priv *pp = ap->private_data;
 956        void __iomem *mmio = hpriv->mmio;
 957        u32 em_ctl;
 958        u32 message[] = {0, 0};
 959        unsigned long flags;
 960        int pmp;
 961        struct ahci_em_priv *emp;
 962
 963        /* get the slot number from the message */
 964        pmp = (state & EM_MSG_LED_PMP_SLOT) >> 8;
 965        if (pmp < EM_MAX_SLOTS)
 966                emp = &pp->em_priv[pmp];
 967        else
 968                return -EINVAL;
 969
 970        spin_lock_irqsave(ap->lock, flags);
 971
 972        /*
 973         * if we are still busy transmitting a previous message,
 974         * do not allow
 975         */
 976        em_ctl = readl(mmio + HOST_EM_CTL);
 977        if (em_ctl & EM_CTL_TM) {
 978                spin_unlock_irqrestore(ap->lock, flags);
 979                return -EBUSY;
 980        }
 981
 982        if (hpriv->em_msg_type & EM_MSG_TYPE_LED) {
 983                /*
 984                 * create message header - this is all zero except for
 985                 * the message size, which is 4 bytes.
 986                 */
 987                message[0] |= (4 << 8);
 988
 989                /* ignore 0:4 of byte zero, fill in port info yourself */
 990                message[1] = ((state & ~EM_MSG_LED_HBA_PORT) | ap->port_no);
 991
 992                /* write message to EM_LOC */
 993                writel(message[0], mmio + hpriv->em_loc);
 994                writel(message[1], mmio + hpriv->em_loc+4);
 995
 996                /*
 997                 * tell hardware to transmit the message
 998                 */
 999                writel(em_ctl | EM_CTL_TM, mmio + HOST_EM_CTL);
1000        }
1001
1002        /* save off new led state for port/slot */
1003        emp->led_state = state;
1004
1005        spin_unlock_irqrestore(ap->lock, flags);
1006        return size;
1007}
1008
1009static ssize_t ahci_led_show(struct ata_port *ap, char *buf)
1010{
1011        struct ahci_port_priv *pp = ap->private_data;
1012        struct ata_link *link;
1013        struct ahci_em_priv *emp;
1014        int rc = 0;
1015
1016        ata_for_each_link(link, ap, EDGE) {
1017                emp = &pp->em_priv[link->pmp];
1018                rc += sprintf(buf, "%lx\n", emp->led_state);
1019        }
1020        return rc;
1021}
1022
1023static ssize_t ahci_led_store(struct ata_port *ap, const char *buf,
1024                                size_t size)
1025{
1026        int state;
1027        int pmp;
1028        struct ahci_port_priv *pp = ap->private_data;
1029        struct ahci_em_priv *emp;
1030
1031        state = simple_strtoul(buf, NULL, 0);
1032
1033        /* get the slot number from the message */
1034        pmp = (state & EM_MSG_LED_PMP_SLOT) >> 8;
1035        if (pmp < EM_MAX_SLOTS)
1036                emp = &pp->em_priv[pmp];
1037        else
1038                return -EINVAL;
1039
1040        /* mask off the activity bits if we are in sw_activity
1041         * mode, user should turn off sw_activity before setting
1042         * activity led through em_message
1043         */
1044        if (emp->blink_policy)
1045                state &= ~EM_MSG_LED_VALUE_ACTIVITY;
1046
1047        return ahci_transmit_led_message(ap, state, size);
1048}
1049
1050static ssize_t ahci_activity_store(struct ata_device *dev, enum sw_activity val)
1051{
1052        struct ata_link *link = dev->link;
1053        struct ata_port *ap = link->ap;
1054        struct ahci_port_priv *pp = ap->private_data;
1055        struct ahci_em_priv *emp = &pp->em_priv[link->pmp];
1056        u32 port_led_state = emp->led_state;
1057
1058        /* save the desired Activity LED behavior */
1059        if (val == OFF) {
1060                /* clear LFLAG */
1061                link->flags &= ~(ATA_LFLAG_SW_ACTIVITY);
1062
1063                /* set the LED to OFF */
1064                port_led_state &= EM_MSG_LED_VALUE_OFF;
1065                port_led_state |= (ap->port_no | (link->pmp << 8));
1066                ahci_transmit_led_message(ap, port_led_state, 4);
1067        } else {
1068                link->flags |= ATA_LFLAG_SW_ACTIVITY;
1069                if (val == BLINK_OFF) {
1070                        /* set LED to ON for idle */
1071                        port_led_state &= EM_MSG_LED_VALUE_OFF;
1072                        port_led_state |= (ap->port_no | (link->pmp << 8));
1073                        port_led_state |= EM_MSG_LED_VALUE_ON; /* check this */
1074                        ahci_transmit_led_message(ap, port_led_state, 4);
1075                }
1076        }
1077        emp->blink_policy = val;
1078        return 0;
1079}
1080
1081static ssize_t ahci_activity_show(struct ata_device *dev, char *buf)
1082{
1083        struct ata_link *link = dev->link;
1084        struct ata_port *ap = link->ap;
1085        struct ahci_port_priv *pp = ap->private_data;
1086        struct ahci_em_priv *emp = &pp->em_priv[link->pmp];
1087
1088        /* display the saved value of activity behavior for this
1089         * disk.
1090         */
1091        return sprintf(buf, "%d\n", emp->blink_policy);
1092}
1093
1094static void ahci_port_init(struct device *dev, struct ata_port *ap,
1095                           int port_no, void __iomem *mmio,
1096                           void __iomem *port_mmio)
1097{
1098        const char *emsg = NULL;
1099        int rc;
1100        u32 tmp;
1101
1102        /* make sure port is not active */
1103        rc = ahci_deinit_port(ap, &emsg);
1104        if (rc)
1105                dev_warn(dev, "%s (%d)\n", emsg, rc);
1106
1107        /* clear SError */
1108        tmp = readl(port_mmio + PORT_SCR_ERR);
1109        VPRINTK("PORT_SCR_ERR 0x%x\n", tmp);
1110        writel(tmp, port_mmio + PORT_SCR_ERR);
1111
1112        /* clear port IRQ */
1113        tmp = readl(port_mmio + PORT_IRQ_STAT);
1114        VPRINTK("PORT_IRQ_STAT 0x%x\n", tmp);
1115        if (tmp)
1116                writel(tmp, port_mmio + PORT_IRQ_STAT);
1117
1118        writel(1 << port_no, mmio + HOST_IRQ_STAT);
1119}
1120
1121void ahci_init_controller(struct ata_host *host)
1122{
1123        struct ahci_host_priv *hpriv = host->private_data;
1124        void __iomem *mmio = hpriv->mmio;
1125        int i;
1126        void __iomem *port_mmio;
1127        u32 tmp;
1128
1129        for (i = 0; i < host->n_ports; i++) {
1130                struct ata_port *ap = host->ports[i];
1131
1132                port_mmio = ahci_port_base(ap);
1133                if (ata_port_is_dummy(ap))
1134                        continue;
1135
1136                ahci_port_init(host->dev, ap, i, mmio, port_mmio);
1137        }
1138
1139        tmp = readl(mmio + HOST_CTL);
1140        VPRINTK("HOST_CTL 0x%x\n", tmp);
1141        writel(tmp | HOST_IRQ_EN, mmio + HOST_CTL);
1142        tmp = readl(mmio + HOST_CTL);
1143        VPRINTK("HOST_CTL 0x%x\n", tmp);
1144}
1145EXPORT_SYMBOL_GPL(ahci_init_controller);
1146
1147static void ahci_dev_config(struct ata_device *dev)
1148{
1149        struct ahci_host_priv *hpriv = dev->link->ap->host->private_data;
1150
1151        if (hpriv->flags & AHCI_HFLAG_SECT255) {
1152                dev->max_sectors = 255;
1153                ata_dev_info(dev,
1154                             "SB600 AHCI: limiting to 255 sectors per cmd\n");
1155        }
1156}
1157
1158unsigned int ahci_dev_classify(struct ata_port *ap)
1159{
1160        void __iomem *port_mmio = ahci_port_base(ap);
1161        struct ata_taskfile tf;
1162        u32 tmp;
1163
1164        tmp = readl(port_mmio + PORT_SIG);
1165        tf.lbah         = (tmp >> 24)   & 0xff;
1166        tf.lbam         = (tmp >> 16)   & 0xff;
1167        tf.lbal         = (tmp >> 8)    & 0xff;
1168        tf.nsect        = (tmp)         & 0xff;
1169
1170        return ata_dev_classify(&tf);
1171}
1172EXPORT_SYMBOL_GPL(ahci_dev_classify);
1173
1174void ahci_fill_cmd_slot(struct ahci_port_priv *pp, unsigned int tag,
1175                        u32 opts)
1176{
1177        dma_addr_t cmd_tbl_dma;
1178
1179        cmd_tbl_dma = pp->cmd_tbl_dma + tag * AHCI_CMD_TBL_SZ;
1180
1181        pp->cmd_slot[tag].opts = cpu_to_le32(opts);
1182        pp->cmd_slot[tag].status = 0;
1183        pp->cmd_slot[tag].tbl_addr = cpu_to_le32(cmd_tbl_dma & 0xffffffff);
1184        pp->cmd_slot[tag].tbl_addr_hi = cpu_to_le32((cmd_tbl_dma >> 16) >> 16);
1185}
1186EXPORT_SYMBOL_GPL(ahci_fill_cmd_slot);
1187
1188int ahci_kick_engine(struct ata_port *ap)
1189{
1190        void __iomem *port_mmio = ahci_port_base(ap);
1191        struct ahci_host_priv *hpriv = ap->host->private_data;
1192        u8 status = readl(port_mmio + PORT_TFDATA) & 0xFF;
1193        u32 tmp;
1194        int busy, rc;
1195
1196        /* stop engine */
1197        rc = ahci_stop_engine(ap);
1198        if (rc)
1199                goto out_restart;
1200
1201        /* need to do CLO?
1202         * always do CLO if PMP is attached (AHCI-1.3 9.2)
1203         */
1204        busy = status & (ATA_BUSY | ATA_DRQ);
1205        if (!busy && !sata_pmp_attached(ap)) {
1206                rc = 0;
1207                goto out_restart;
1208        }
1209
1210        if (!(hpriv->cap & HOST_CAP_CLO)) {
1211                rc = -EOPNOTSUPP;
1212                goto out_restart;
1213        }
1214
1215        /* perform CLO */
1216        tmp = readl(port_mmio + PORT_CMD);
1217        tmp |= PORT_CMD_CLO;
1218        writel(tmp, port_mmio + PORT_CMD);
1219
1220        rc = 0;
1221        tmp = ata_wait_register(ap, port_mmio + PORT_CMD,
1222                                PORT_CMD_CLO, PORT_CMD_CLO, 1, 500);
1223        if (tmp & PORT_CMD_CLO)
1224                rc = -EIO;
1225
1226        /* restart engine */
1227 out_restart:
1228        ahci_start_engine(ap);
1229        return rc;
1230}
1231EXPORT_SYMBOL_GPL(ahci_kick_engine);
1232
1233static int ahci_exec_polled_cmd(struct ata_port *ap, int pmp,
1234                                struct ata_taskfile *tf, int is_cmd, u16 flags,
1235                                unsigned long timeout_msec)
1236{
1237        const u32 cmd_fis_len = 5; /* five dwords */
1238        struct ahci_port_priv *pp = ap->private_data;
1239        void __iomem *port_mmio = ahci_port_base(ap);
1240        u8 *fis = pp->cmd_tbl;
1241        u32 tmp;
1242
1243        /* prep the command */
1244        ata_tf_to_fis(tf, pmp, is_cmd, fis);
1245        ahci_fill_cmd_slot(pp, 0, cmd_fis_len | flags | (pmp << 12));
1246
1247        /* issue & wait */
1248        writel(1, port_mmio + PORT_CMD_ISSUE);
1249
1250        if (timeout_msec) {
1251                tmp = ata_wait_register(ap, port_mmio + PORT_CMD_ISSUE,
1252                                        0x1, 0x1, 1, timeout_msec);
1253                if (tmp & 0x1) {
1254                        ahci_kick_engine(ap);
1255                        return -EBUSY;
1256                }
1257        } else
1258                readl(port_mmio + PORT_CMD_ISSUE);      /* flush */
1259
1260        return 0;
1261}
1262
1263int ahci_do_softreset(struct ata_link *link, unsigned int *class,
1264                      int pmp, unsigned long deadline,
1265                      int (*check_ready)(struct ata_link *link))
1266{
1267        struct ata_port *ap = link->ap;
1268        struct ahci_host_priv *hpriv = ap->host->private_data;
1269        const char *reason = NULL;
1270        unsigned long now, msecs;
1271        struct ata_taskfile tf;
1272        int rc;
1273
1274        DPRINTK("ENTER\n");
1275
1276        /* prepare for SRST (AHCI-1.1 10.4.1) */
1277        rc = ahci_kick_engine(ap);
1278        if (rc && rc != -EOPNOTSUPP)
1279                ata_link_warn(link, "failed to reset engine (errno=%d)\n", rc);
1280
1281        ata_tf_init(link->device, &tf);
1282
1283        /* issue the first D2H Register FIS */
1284        msecs = 0;
1285        now = jiffies;
1286        if (time_after(deadline, now))
1287                msecs = jiffies_to_msecs(deadline - now);
1288
1289        tf.ctl |= ATA_SRST;
1290        if (ahci_exec_polled_cmd(ap, pmp, &tf, 0,
1291                                 AHCI_CMD_RESET | AHCI_CMD_CLR_BUSY, msecs)) {
1292                rc = -EIO;
1293                reason = "1st FIS failed";
1294                goto fail;
1295        }
1296
1297        /* spec says at least 5us, but be generous and sleep for 1ms */
1298        ata_msleep(ap, 1);
1299
1300        /* issue the second D2H Register FIS */
1301        tf.ctl &= ~ATA_SRST;
1302        ahci_exec_polled_cmd(ap, pmp, &tf, 0, 0, 0);
1303
1304        /* wait for link to become ready */
1305        rc = ata_wait_after_reset(link, deadline, check_ready);
1306        if (rc == -EBUSY && hpriv->flags & AHCI_HFLAG_SRST_TOUT_IS_OFFLINE) {
1307                /*
1308                 * Workaround for cases where link online status can't
1309                 * be trusted.  Treat device readiness timeout as link
1310                 * offline.
1311                 */
1312                ata_link_info(link, "device not ready, treating as offline\n");
1313                *class = ATA_DEV_NONE;
1314        } else if (rc) {
1315                /* link occupied, -ENODEV too is an error */
1316                reason = "device not ready";
1317                goto fail;
1318        } else
1319                *class = ahci_dev_classify(ap);
1320
1321        DPRINTK("EXIT, class=%u\n", *class);
1322        return 0;
1323
1324 fail:
1325        ata_link_err(link, "softreset failed (%s)\n", reason);
1326        return rc;
1327}
1328
1329int ahci_check_ready(struct ata_link *link)
1330{
1331        void __iomem *port_mmio = ahci_port_base(link->ap);
1332        u8 status = readl(port_mmio + PORT_TFDATA) & 0xFF;
1333
1334        return ata_check_ready(status);
1335}
1336EXPORT_SYMBOL_GPL(ahci_check_ready);
1337
1338static int ahci_softreset(struct ata_link *link, unsigned int *class,
1339                          unsigned long deadline)
1340{
1341        int pmp = sata_srst_pmp(link);
1342
1343        DPRINTK("ENTER\n");
1344
1345        return ahci_do_softreset(link, class, pmp, deadline, ahci_check_ready);
1346}
1347EXPORT_SYMBOL_GPL(ahci_do_softreset);
1348
1349static int ahci_bad_pmp_check_ready(struct ata_link *link)
1350{
1351        void __iomem *port_mmio = ahci_port_base(link->ap);
1352        u8 status = readl(port_mmio + PORT_TFDATA) & 0xFF;
1353        u32 irq_status = readl(port_mmio + PORT_IRQ_STAT);
1354
1355        /*
1356         * There is no need to check TFDATA if BAD PMP is found due to HW bug,
1357         * which can save timeout delay.
1358         */
1359        if (irq_status & PORT_IRQ_BAD_PMP)
1360                return -EIO;
1361
1362        return ata_check_ready(status);
1363}
1364
1365int ahci_pmp_retry_softreset(struct ata_link *link, unsigned int *class,
1366                                unsigned long deadline)
1367{
1368        struct ata_port *ap = link->ap;
1369        void __iomem *port_mmio = ahci_port_base(ap);
1370        int pmp = sata_srst_pmp(link);
1371        int rc;
1372        u32 irq_sts;
1373
1374        DPRINTK("ENTER\n");
1375
1376        rc = ahci_do_softreset(link, class, pmp, deadline,
1377                               ahci_bad_pmp_check_ready);
1378
1379        /*
1380         * Soft reset fails with IPMS set when PMP is enabled but
1381         * SATA HDD/ODD is connected to SATA port, do soft reset
1382         * again to port 0.
1383         */
1384        if (rc == -EIO) {
1385                irq_sts = readl(port_mmio + PORT_IRQ_STAT);
1386                if (irq_sts & PORT_IRQ_BAD_PMP) {
1387                        ata_link_warn(link,
1388                                        "applying PMP SRST workaround "
1389                                        "and retrying\n");
1390                        rc = ahci_do_softreset(link, class, 0, deadline,
1391                                               ahci_check_ready);
1392                }
1393        }
1394
1395        return rc;
1396}
1397
1398static int ahci_hardreset(struct ata_link *link, unsigned int *class,
1399                          unsigned long deadline)
1400{
1401        const unsigned long *timing = sata_ehc_deb_timing(&link->eh_context);
1402        struct ata_port *ap = link->ap;
1403        struct ahci_port_priv *pp = ap->private_data;
1404        u8 *d2h_fis = pp->rx_fis + RX_FIS_D2H_REG;
1405        struct ata_taskfile tf;
1406        bool online;
1407        int rc;
1408
1409        DPRINTK("ENTER\n");
1410
1411        ahci_stop_engine(ap);
1412
1413        /* clear D2H reception area to properly wait for D2H FIS */
1414        ata_tf_init(link->device, &tf);
1415        tf.command = 0x80;
1416        ata_tf_to_fis(&tf, 0, 0, d2h_fis);
1417
1418        rc = sata_link_hardreset(link, timing, deadline, &online,
1419                                 ahci_check_ready);
1420
1421        ahci_start_engine(ap);
1422
1423        if (online)
1424                *class = ahci_dev_classify(ap);
1425
1426        DPRINTK("EXIT, rc=%d, class=%u\n", rc, *class);
1427        return rc;
1428}
1429
1430static void ahci_postreset(struct ata_link *link, unsigned int *class)
1431{
1432        struct ata_port *ap = link->ap;
1433        void __iomem *port_mmio = ahci_port_base(ap);
1434        u32 new_tmp, tmp;
1435
1436        ata_std_postreset(link, class);
1437
1438        /* Make sure port's ATAPI bit is set appropriately */
1439        new_tmp = tmp = readl(port_mmio + PORT_CMD);
1440        if (*class == ATA_DEV_ATAPI)
1441                new_tmp |= PORT_CMD_ATAPI;
1442        else
1443                new_tmp &= ~PORT_CMD_ATAPI;
1444        if (new_tmp != tmp) {
1445                writel(new_tmp, port_mmio + PORT_CMD);
1446                readl(port_mmio + PORT_CMD); /* flush */
1447        }
1448}
1449
1450static unsigned int ahci_fill_sg(struct ata_queued_cmd *qc, void *cmd_tbl)
1451{
1452        struct scatterlist *sg;
1453        struct ahci_sg *ahci_sg = cmd_tbl + AHCI_CMD_TBL_HDR_SZ;
1454        unsigned int si;
1455
1456        VPRINTK("ENTER\n");
1457
1458        /*
1459         * Next, the S/G list.
1460         */
1461        for_each_sg(qc->sg, sg, qc->n_elem, si) {
1462                dma_addr_t addr = sg_dma_address(sg);
1463                u32 sg_len = sg_dma_len(sg);
1464
1465                ahci_sg[si].addr = cpu_to_le32(addr & 0xffffffff);
1466                ahci_sg[si].addr_hi = cpu_to_le32((addr >> 16) >> 16);
1467                ahci_sg[si].flags_size = cpu_to_le32(sg_len - 1);
1468        }
1469
1470        return si;
1471}
1472
1473static int ahci_pmp_qc_defer(struct ata_queued_cmd *qc)
1474{
1475        struct ata_port *ap = qc->ap;
1476        struct ahci_port_priv *pp = ap->private_data;
1477
1478        if (!sata_pmp_attached(ap) || pp->fbs_enabled)
1479                return ata_std_qc_defer(qc);
1480        else
1481                return sata_pmp_qc_defer_cmd_switch(qc);
1482}
1483
1484static void ahci_qc_prep(struct ata_queued_cmd *qc)
1485{
1486        struct ata_port *ap = qc->ap;
1487        struct ahci_port_priv *pp = ap->private_data;
1488        int is_atapi = ata_is_atapi(qc->tf.protocol);
1489        void *cmd_tbl;
1490        u32 opts;
1491        const u32 cmd_fis_len = 5; /* five dwords */
1492        unsigned int n_elem;
1493
1494        /*
1495         * Fill in command table information.  First, the header,
1496         * a SATA Register - Host to Device command FIS.
1497         */
1498        cmd_tbl = pp->cmd_tbl + qc->tag * AHCI_CMD_TBL_SZ;
1499
1500        ata_tf_to_fis(&qc->tf, qc->dev->link->pmp, 1, cmd_tbl);
1501        if (is_atapi) {
1502                memset(cmd_tbl + AHCI_CMD_TBL_CDB, 0, 32);
1503                memcpy(cmd_tbl + AHCI_CMD_TBL_CDB, qc->cdb, qc->dev->cdb_len);
1504        }
1505
1506        n_elem = 0;
1507        if (qc->flags & ATA_QCFLAG_DMAMAP)
1508                n_elem = ahci_fill_sg(qc, cmd_tbl);
1509
1510        /*
1511         * Fill in command slot information.
1512         */
1513        opts = cmd_fis_len | n_elem << 16 | (qc->dev->link->pmp << 12);
1514        if (qc->tf.flags & ATA_TFLAG_WRITE)
1515                opts |= AHCI_CMD_WRITE;
1516        if (is_atapi)
1517                opts |= AHCI_CMD_ATAPI | AHCI_CMD_PREFETCH;
1518
1519        ahci_fill_cmd_slot(pp, qc->tag, opts);
1520}
1521
1522static void ahci_fbs_dec_intr(struct ata_port *ap)
1523{
1524        struct ahci_port_priv *pp = ap->private_data;
1525        void __iomem *port_mmio = ahci_port_base(ap);
1526        u32 fbs = readl(port_mmio + PORT_FBS);
1527        int retries = 3;
1528
1529        DPRINTK("ENTER\n");
1530        BUG_ON(!pp->fbs_enabled);
1531
1532        /* time to wait for DEC is not specified by AHCI spec,
1533         * add a retry loop for safety.
1534         */
1535        writel(fbs | PORT_FBS_DEC, port_mmio + PORT_FBS);
1536        fbs = readl(port_mmio + PORT_FBS);
1537        while ((fbs & PORT_FBS_DEC) && retries--) {
1538                udelay(1);
1539                fbs = readl(port_mmio + PORT_FBS);
1540        }
1541
1542        if (fbs & PORT_FBS_DEC)
1543                dev_err(ap->host->dev, "failed to clear device error\n");
1544}
1545
1546static void ahci_error_intr(struct ata_port *ap, u32 irq_stat)
1547{
1548        struct ahci_host_priv *hpriv = ap->host->private_data;
1549        struct ahci_port_priv *pp = ap->private_data;
1550        struct ata_eh_info *host_ehi = &ap->link.eh_info;
1551        struct ata_link *link = NULL;
1552        struct ata_queued_cmd *active_qc;
1553        struct ata_eh_info *active_ehi;
1554        bool fbs_need_dec = false;
1555        u32 serror;
1556
1557        /* determine active link with error */
1558        if (pp->fbs_enabled) {
1559                void __iomem *port_mmio = ahci_port_base(ap);
1560                u32 fbs = readl(port_mmio + PORT_FBS);
1561                int pmp = fbs >> PORT_FBS_DWE_OFFSET;
1562
1563                if ((fbs & PORT_FBS_SDE) && (pmp < ap->nr_pmp_links) &&
1564                    ata_link_online(&ap->pmp_link[pmp])) {
1565                        link = &ap->pmp_link[pmp];
1566                        fbs_need_dec = true;
1567                }
1568
1569        } else
1570                ata_for_each_link(link, ap, EDGE)
1571                        if (ata_link_active(link))
1572                                break;
1573
1574        if (!link)
1575                link = &ap->link;
1576
1577        active_qc = ata_qc_from_tag(ap, link->active_tag);
1578        active_ehi = &link->eh_info;
1579
1580        /* record irq stat */
1581        ata_ehi_clear_desc(host_ehi);
1582        ata_ehi_push_desc(host_ehi, "irq_stat 0x%08x", irq_stat);
1583
1584        /* AHCI needs SError cleared; otherwise, it might lock up */
1585        ahci_scr_read(&ap->link, SCR_ERROR, &serror);
1586        ahci_scr_write(&ap->link, SCR_ERROR, serror);
1587        host_ehi->serror |= serror;
1588
1589        /* some controllers set IRQ_IF_ERR on device errors, ignore it */
1590        if (hpriv->flags & AHCI_HFLAG_IGN_IRQ_IF_ERR)
1591                irq_stat &= ~PORT_IRQ_IF_ERR;
1592
1593        if (irq_stat & PORT_IRQ_TF_ERR) {
1594                /* If qc is active, charge it; otherwise, the active
1595                 * link.  There's no active qc on NCQ errors.  It will
1596                 * be determined by EH by reading log page 10h.
1597                 */
1598                if (active_qc)
1599                        active_qc->err_mask |= AC_ERR_DEV;
1600                else
1601                        active_ehi->err_mask |= AC_ERR_DEV;
1602
1603                if (hpriv->flags & AHCI_HFLAG_IGN_SERR_INTERNAL)
1604                        host_ehi->serror &= ~SERR_INTERNAL;
1605        }
1606
1607        if (irq_stat & PORT_IRQ_UNK_FIS) {
1608                u32 *unk = (u32 *)(pp->rx_fis + RX_FIS_UNK);
1609
1610                active_ehi->err_mask |= AC_ERR_HSM;
1611                active_ehi->action |= ATA_EH_RESET;
1612                ata_ehi_push_desc(active_ehi,
1613                                  "unknown FIS %08x %08x %08x %08x" ,
1614                                  unk[0], unk[1], unk[2], unk[3]);
1615        }
1616
1617        if (sata_pmp_attached(ap) && (irq_stat & PORT_IRQ_BAD_PMP)) {
1618                active_ehi->err_mask |= AC_ERR_HSM;
1619                active_ehi->action |= ATA_EH_RESET;
1620                ata_ehi_push_desc(active_ehi, "incorrect PMP");
1621        }
1622
1623        if (irq_stat & (PORT_IRQ_HBUS_ERR | PORT_IRQ_HBUS_DATA_ERR)) {
1624                host_ehi->err_mask |= AC_ERR_HOST_BUS;
1625                host_ehi->action |= ATA_EH_RESET;
1626                ata_ehi_push_desc(host_ehi, "host bus error");
1627        }
1628
1629        if (irq_stat & PORT_IRQ_IF_ERR) {
1630                if (fbs_need_dec)
1631                        active_ehi->err_mask |= AC_ERR_DEV;
1632                else {
1633                        host_ehi->err_mask |= AC_ERR_ATA_BUS;
1634                        host_ehi->action |= ATA_EH_RESET;
1635                }
1636
1637                ata_ehi_push_desc(host_ehi, "interface fatal error");
1638        }
1639
1640        if (irq_stat & (PORT_IRQ_CONNECT | PORT_IRQ_PHYRDY)) {
1641                ata_ehi_hotplugged(host_ehi);
1642                ata_ehi_push_desc(host_ehi, "%s",
1643                        irq_stat & PORT_IRQ_CONNECT ?
1644                        "connection status changed" : "PHY RDY changed");
1645        }
1646
1647        /* okay, let's hand over to EH */
1648
1649        if (irq_stat & PORT_IRQ_FREEZE)
1650                ata_port_freeze(ap);
1651        else if (fbs_need_dec) {
1652                ata_link_abort(link);
1653                ahci_fbs_dec_intr(ap);
1654        } else
1655                ata_port_abort(ap);
1656}
1657
1658static void ahci_handle_port_interrupt(struct ata_port *ap,
1659                                       void __iomem *port_mmio, u32 status)
1660{
1661        struct ata_eh_info *ehi = &ap->link.eh_info;
1662        struct ahci_port_priv *pp = ap->private_data;
1663        struct ahci_host_priv *hpriv = ap->host->private_data;
1664        int resetting = !!(ap->pflags & ATA_PFLAG_RESETTING);
1665        u32 qc_active = 0;
1666        int rc;
1667
1668        /* ignore BAD_PMP while resetting */
1669        if (unlikely(resetting))
1670                status &= ~PORT_IRQ_BAD_PMP;
1671
1672        /* if LPM is enabled, PHYRDY doesn't mean anything */
1673        if (ap->link.lpm_policy > ATA_LPM_MAX_POWER) {
1674                status &= ~PORT_IRQ_PHYRDY;
1675                ahci_scr_write(&ap->link, SCR_ERROR, SERR_PHYRDY_CHG);
1676        }
1677
1678        if (unlikely(status & PORT_IRQ_ERROR)) {
1679                ahci_error_intr(ap, status);
1680                return;
1681        }
1682
1683        if (status & PORT_IRQ_SDB_FIS) {
1684                /* If SNotification is available, leave notification
1685                 * handling to sata_async_notification().  If not,
1686                 * emulate it by snooping SDB FIS RX area.
1687                 *
1688                 * Snooping FIS RX area is probably cheaper than
1689                 * poking SNotification but some constrollers which
1690                 * implement SNotification, ICH9 for example, don't
1691                 * store AN SDB FIS into receive area.
1692                 */
1693                if (hpriv->cap & HOST_CAP_SNTF)
1694                        sata_async_notification(ap);
1695                else {
1696                        /* If the 'N' bit in word 0 of the FIS is set,
1697                         * we just received asynchronous notification.
1698                         * Tell libata about it.
1699                         *
1700                         * Lack of SNotification should not appear in
1701                         * ahci 1.2, so the workaround is unnecessary
1702                         * when FBS is enabled.
1703                         */
1704                        if (pp->fbs_enabled)
1705                                WARN_ON_ONCE(1);
1706                        else {
1707                                const __le32 *f = pp->rx_fis + RX_FIS_SDB;
1708                                u32 f0 = le32_to_cpu(f[0]);
1709                                if (f0 & (1 << 15))
1710                                        sata_async_notification(ap);
1711                        }
1712                }
1713        }
1714
1715        /* pp->active_link is not reliable once FBS is enabled, both
1716         * PORT_SCR_ACT and PORT_CMD_ISSUE should be checked because
1717         * NCQ and non-NCQ commands may be in flight at the same time.
1718         */
1719        if (pp->fbs_enabled) {
1720                if (ap->qc_active) {
1721                        qc_active = readl(port_mmio + PORT_SCR_ACT);
1722                        qc_active |= readl(port_mmio + PORT_CMD_ISSUE);
1723                }
1724        } else {
1725                /* pp->active_link is valid iff any command is in flight */
1726                if (ap->qc_active && pp->active_link->sactive)
1727                        qc_active = readl(port_mmio + PORT_SCR_ACT);
1728                else
1729                        qc_active = readl(port_mmio + PORT_CMD_ISSUE);
1730        }
1731
1732
1733        rc = ata_qc_complete_multiple(ap, qc_active);
1734
1735        /* while resetting, invalid completions are expected */
1736        if (unlikely(rc < 0 && !resetting)) {
1737                ehi->err_mask |= AC_ERR_HSM;
1738                ehi->action |= ATA_EH_RESET;
1739                ata_port_freeze(ap);
1740        }
1741}
1742
1743void ahci_port_intr(struct ata_port *ap)
1744{
1745        void __iomem *port_mmio = ahci_port_base(ap);
1746        u32 status;
1747
1748        status = readl(port_mmio + PORT_IRQ_STAT);
1749        writel(status, port_mmio + PORT_IRQ_STAT);
1750
1751        ahci_handle_port_interrupt(ap, port_mmio, status);
1752}
1753
1754irqreturn_t ahci_thread_fn(int irq, void *dev_instance)
1755{
1756        struct ata_port *ap = dev_instance;
1757        struct ahci_port_priv *pp = ap->private_data;
1758        void __iomem *port_mmio = ahci_port_base(ap);
1759        unsigned long flags;
1760        u32 status;
1761
1762        spin_lock_irqsave(&ap->host->lock, flags);
1763        status = pp->intr_status;
1764        if (status)
1765                pp->intr_status = 0;
1766        spin_unlock_irqrestore(&ap->host->lock, flags);
1767
1768        spin_lock_bh(ap->lock);
1769        ahci_handle_port_interrupt(ap, port_mmio, status);
1770        spin_unlock_bh(ap->lock);
1771
1772        return IRQ_HANDLED;
1773}
1774EXPORT_SYMBOL_GPL(ahci_thread_fn);
1775
1776void ahci_hw_port_interrupt(struct ata_port *ap)
1777{
1778        void __iomem *port_mmio = ahci_port_base(ap);
1779        struct ahci_port_priv *pp = ap->private_data;
1780        u32 status;
1781
1782        status = readl(port_mmio + PORT_IRQ_STAT);
1783        writel(status, port_mmio + PORT_IRQ_STAT);
1784
1785        pp->intr_status |= status;
1786}
1787
1788irqreturn_t ahci_hw_interrupt(int irq, void *dev_instance)
1789{
1790        struct ata_port *ap_this = dev_instance;
1791        struct ahci_port_priv *pp = ap_this->private_data;
1792        struct ata_host *host = ap_this->host;
1793        struct ahci_host_priv *hpriv = host->private_data;
1794        void __iomem *mmio = hpriv->mmio;
1795        unsigned int i;
1796        u32 irq_stat, irq_masked;
1797
1798        VPRINTK("ENTER\n");
1799
1800        spin_lock(&host->lock);
1801
1802        irq_stat = readl(mmio + HOST_IRQ_STAT);
1803
1804        if (!irq_stat) {
1805                u32 status = pp->intr_status;
1806
1807                spin_unlock(&host->lock);
1808
1809                VPRINTK("EXIT\n");
1810
1811                return status ? IRQ_WAKE_THREAD : IRQ_NONE;
1812        }
1813
1814        irq_masked = irq_stat & hpriv->port_map;
1815
1816        for (i = 0; i < host->n_ports; i++) {
1817                struct ata_port *ap;
1818
1819                if (!(irq_masked & (1 << i)))
1820                        continue;
1821
1822                ap = host->ports[i];
1823                if (ap) {
1824                        ahci_hw_port_interrupt(ap);
1825                        VPRINTK("port %u\n", i);
1826                } else {
1827                        VPRINTK("port %u (no irq)\n", i);
1828                        if (ata_ratelimit())
1829                                dev_warn(host->dev,
1830                                         "interrupt on disabled port %u\n", i);
1831                }
1832        }
1833
1834        writel(irq_stat, mmio + HOST_IRQ_STAT);
1835
1836        spin_unlock(&host->lock);
1837
1838        VPRINTK("EXIT\n");
1839
1840        return IRQ_WAKE_THREAD;
1841}
1842EXPORT_SYMBOL_GPL(ahci_hw_interrupt);
1843
1844irqreturn_t ahci_interrupt(int irq, void *dev_instance)
1845{
1846        struct ata_host *host = dev_instance;
1847        struct ahci_host_priv *hpriv;
1848        unsigned int i, handled = 0;
1849        void __iomem *mmio;
1850        u32 irq_stat, irq_masked;
1851
1852        VPRINTK("ENTER\n");
1853
1854        hpriv = host->private_data;
1855        mmio = hpriv->mmio;
1856
1857        /* sigh.  0xffffffff is a valid return from h/w */
1858        irq_stat = readl(mmio + HOST_IRQ_STAT);
1859        if (!irq_stat)
1860                return IRQ_NONE;
1861
1862        irq_masked = irq_stat & hpriv->port_map;
1863
1864        spin_lock(&host->lock);
1865
1866        for (i = 0; i < host->n_ports; i++) {
1867                struct ata_port *ap;
1868
1869                if (!(irq_masked & (1 << i)))
1870                        continue;
1871
1872                ap = host->ports[i];
1873                if (ap) {
1874                        ahci_port_intr(ap);
1875                        VPRINTK("port %u\n", i);
1876                } else {
1877                        VPRINTK("port %u (no irq)\n", i);
1878                        if (ata_ratelimit())
1879                                dev_warn(host->dev,
1880                                         "interrupt on disabled port %u\n", i);
1881                }
1882
1883                handled = 1;
1884        }
1885
1886        /* HOST_IRQ_STAT behaves as level triggered latch meaning that
1887         * it should be cleared after all the port events are cleared;
1888         * otherwise, it will raise a spurious interrupt after each
1889         * valid one.  Please read section 10.6.2 of ahci 1.1 for more
1890         * information.
1891         *
1892         * Also, use the unmasked value to clear interrupt as spurious
1893         * pending event on a dummy port might cause screaming IRQ.
1894         */
1895        writel(irq_stat, mmio + HOST_IRQ_STAT);
1896
1897        spin_unlock(&host->lock);
1898
1899        VPRINTK("EXIT\n");
1900
1901        return IRQ_RETVAL(handled);
1902}
1903EXPORT_SYMBOL_GPL(ahci_interrupt);
1904
1905static unsigned int ahci_qc_issue(struct ata_queued_cmd *qc)
1906{
1907        struct ata_port *ap = qc->ap;
1908        void __iomem *port_mmio = ahci_port_base(ap);
1909        struct ahci_port_priv *pp = ap->private_data;
1910
1911        /* Keep track of the currently active link.  It will be used
1912         * in completion path to determine whether NCQ phase is in
1913         * progress.
1914         */
1915        pp->active_link = qc->dev->link;
1916
1917        if (qc->tf.protocol == ATA_PROT_NCQ)
1918                writel(1 << qc->tag, port_mmio + PORT_SCR_ACT);
1919
1920        if (pp->fbs_enabled && pp->fbs_last_dev != qc->dev->link->pmp) {
1921                u32 fbs = readl(port_mmio + PORT_FBS);
1922                fbs &= ~(PORT_FBS_DEV_MASK | PORT_FBS_DEC);
1923                fbs |= qc->dev->link->pmp << PORT_FBS_DEV_OFFSET;
1924                writel(fbs, port_mmio + PORT_FBS);
1925                pp->fbs_last_dev = qc->dev->link->pmp;
1926        }
1927
1928        writel(1 << qc->tag, port_mmio + PORT_CMD_ISSUE);
1929
1930        ahci_sw_activity(qc->dev->link);
1931
1932        return 0;
1933}
1934
1935static bool ahci_qc_fill_rtf(struct ata_queued_cmd *qc)
1936{
1937        struct ahci_port_priv *pp = qc->ap->private_data;
1938        u8 *rx_fis = pp->rx_fis;
1939
1940        if (pp->fbs_enabled)
1941                rx_fis += qc->dev->link->pmp * AHCI_RX_FIS_SZ;
1942
1943        /*
1944         * After a successful execution of an ATA PIO data-in command,
1945         * the device doesn't send D2H Reg FIS to update the TF and
1946         * the host should take TF and E_Status from the preceding PIO
1947         * Setup FIS.
1948         */
1949        if (qc->tf.protocol == ATA_PROT_PIO && qc->dma_dir == DMA_FROM_DEVICE &&
1950            !(qc->flags & ATA_QCFLAG_FAILED)) {
1951                ata_tf_from_fis(rx_fis + RX_FIS_PIO_SETUP, &qc->result_tf);
1952                qc->result_tf.command = (rx_fis + RX_FIS_PIO_SETUP)[15];
1953        } else
1954                ata_tf_from_fis(rx_fis + RX_FIS_D2H_REG, &qc->result_tf);
1955
1956        return true;
1957}
1958
1959static void ahci_freeze(struct ata_port *ap)
1960{
1961        void __iomem *port_mmio = ahci_port_base(ap);
1962
1963        /* turn IRQ off */
1964        writel(0, port_mmio + PORT_IRQ_MASK);
1965}
1966
1967static void ahci_thaw(struct ata_port *ap)
1968{
1969        struct ahci_host_priv *hpriv = ap->host->private_data;
1970        void __iomem *mmio = hpriv->mmio;
1971        void __iomem *port_mmio = ahci_port_base(ap);
1972        u32 tmp;
1973        struct ahci_port_priv *pp = ap->private_data;
1974
1975        /* clear IRQ */
1976        tmp = readl(port_mmio + PORT_IRQ_STAT);
1977        writel(tmp, port_mmio + PORT_IRQ_STAT);
1978        writel(1 << ap->port_no, mmio + HOST_IRQ_STAT);
1979
1980        /* turn IRQ back on */
1981        writel(pp->intr_mask, port_mmio + PORT_IRQ_MASK);
1982}
1983
1984static void ahci_error_handler(struct ata_port *ap)
1985{
1986        if (!(ap->pflags & ATA_PFLAG_FROZEN)) {
1987                /* restart engine */
1988                ahci_stop_engine(ap);
1989                ahci_start_engine(ap);
1990        }
1991
1992        sata_pmp_error_handler(ap);
1993
1994        if (!ata_dev_enabled(ap->link.device))
1995                ahci_stop_engine(ap);
1996}
1997
1998static void ahci_post_internal_cmd(struct ata_queued_cmd *qc)
1999{
2000        struct ata_port *ap = qc->ap;
2001
2002        /* make DMA engine forget about the failed command */
2003        if (qc->flags & ATA_QCFLAG_FAILED)
2004                ahci_kick_engine(ap);
2005}
2006
2007static void ahci_set_aggressive_devslp(struct ata_port *ap, bool sleep)
2008{
2009        void __iomem *port_mmio = ahci_port_base(ap);
2010        struct ata_device *dev = ap->link.device;
2011        u32 devslp, dm, dito, mdat, deto;
2012        int rc;
2013        unsigned int err_mask;
2014
2015        devslp = readl(port_mmio + PORT_DEVSLP);
2016        if (!(devslp & PORT_DEVSLP_DSP)) {
2017                dev_err(ap->host->dev, "port does not support device sleep\n");
2018                return;
2019        }
2020
2021        /* disable device sleep */
2022        if (!sleep) {
2023                if (devslp & PORT_DEVSLP_ADSE) {
2024                        writel(devslp & ~PORT_DEVSLP_ADSE,
2025                               port_mmio + PORT_DEVSLP);
2026                        err_mask = ata_dev_set_feature(dev,
2027                                                       SETFEATURES_SATA_DISABLE,
2028                                                       SATA_DEVSLP);
2029                        if (err_mask && err_mask != AC_ERR_DEV)
2030                                ata_dev_warn(dev, "failed to disable DEVSLP\n");
2031                }
2032                return;
2033        }
2034
2035        /* device sleep was already enabled */
2036        if (devslp & PORT_DEVSLP_ADSE)
2037                return;
2038
2039        /* set DITO, MDAT, DETO and enable DevSlp, need to stop engine first */
2040        rc = ahci_stop_engine(ap);
2041        if (rc)
2042                return;
2043
2044        dm = (devslp & PORT_DEVSLP_DM_MASK) >> PORT_DEVSLP_DM_OFFSET;
2045        dito = devslp_idle_timeout / (dm + 1);
2046        if (dito > 0x3ff)
2047                dito = 0x3ff;
2048
2049        /* Use the nominal value 10 ms if the read MDAT is zero,
2050         * the nominal value of DETO is 20 ms.
2051         */
2052        if (dev->devslp_timing[ATA_LOG_DEVSLP_VALID] &
2053            ATA_LOG_DEVSLP_VALID_MASK) {
2054                mdat = dev->devslp_timing[ATA_LOG_DEVSLP_MDAT] &
2055                       ATA_LOG_DEVSLP_MDAT_MASK;
2056                if (!mdat)
2057                        mdat = 10;
2058                deto = dev->devslp_timing[ATA_LOG_DEVSLP_DETO];
2059                if (!deto)
2060                        deto = 20;
2061        } else {
2062                mdat = 10;
2063                deto = 20;
2064        }
2065
2066        devslp |= ((dito << PORT_DEVSLP_DITO_OFFSET) |
2067                   (mdat << PORT_DEVSLP_MDAT_OFFSET) |
2068                   (deto << PORT_DEVSLP_DETO_OFFSET) |
2069                   PORT_DEVSLP_ADSE);
2070        writel(devslp, port_mmio + PORT_DEVSLP);
2071
2072        ahci_start_engine(ap);
2073
2074        /* enable device sleep feature for the drive */
2075        err_mask = ata_dev_set_feature(dev,
2076                                       SETFEATURES_SATA_ENABLE,
2077                                       SATA_DEVSLP);
2078        if (err_mask && err_mask != AC_ERR_DEV)
2079                ata_dev_warn(dev, "failed to enable DEVSLP\n");
2080}
2081
2082static void ahci_enable_fbs(struct ata_port *ap)
2083{
2084        struct ahci_port_priv *pp = ap->private_data;
2085        void __iomem *port_mmio = ahci_port_base(ap);
2086        u32 fbs;
2087        int rc;
2088
2089        if (!pp->fbs_supported)
2090                return;
2091
2092        fbs = readl(port_mmio + PORT_FBS);
2093        if (fbs & PORT_FBS_EN) {
2094                pp->fbs_enabled = true;
2095                pp->fbs_last_dev = -1; /* initialization */
2096                return;
2097        }
2098
2099        rc = ahci_stop_engine(ap);
2100        if (rc)
2101                return;
2102
2103        writel(fbs | PORT_FBS_EN, port_mmio + PORT_FBS);
2104        fbs = readl(port_mmio + PORT_FBS);
2105        if (fbs & PORT_FBS_EN) {
2106                dev_info(ap->host->dev, "FBS is enabled\n");
2107                pp->fbs_enabled = true;
2108                pp->fbs_last_dev = -1; /* initialization */
2109        } else
2110                dev_err(ap->host->dev, "Failed to enable FBS\n");
2111
2112        ahci_start_engine(ap);
2113}
2114
2115static void ahci_disable_fbs(struct ata_port *ap)
2116{
2117        struct ahci_port_priv *pp = ap->private_data;
2118        void __iomem *port_mmio = ahci_port_base(ap);
2119        u32 fbs;
2120        int rc;
2121
2122        if (!pp->fbs_supported)
2123                return;
2124
2125        fbs = readl(port_mmio + PORT_FBS);
2126        if ((fbs & PORT_FBS_EN) == 0) {
2127                pp->fbs_enabled = false;
2128                return;
2129        }
2130
2131        rc = ahci_stop_engine(ap);
2132        if (rc)
2133                return;
2134
2135        writel(fbs & ~PORT_FBS_EN, port_mmio + PORT_FBS);
2136        fbs = readl(port_mmio + PORT_FBS);
2137        if (fbs & PORT_FBS_EN)
2138                dev_err(ap->host->dev, "Failed to disable FBS\n");
2139        else {
2140                dev_info(ap->host->dev, "FBS is disabled\n");
2141                pp->fbs_enabled = false;
2142        }
2143
2144        ahci_start_engine(ap);
2145}
2146
2147static void ahci_pmp_attach(struct ata_port *ap)
2148{
2149        void __iomem *port_mmio = ahci_port_base(ap);
2150        struct ahci_port_priv *pp = ap->private_data;
2151        u32 cmd;
2152
2153        cmd = readl(port_mmio + PORT_CMD);
2154        cmd |= PORT_CMD_PMP;
2155        writel(cmd, port_mmio + PORT_CMD);
2156
2157        ahci_enable_fbs(ap);
2158
2159        pp->intr_mask |= PORT_IRQ_BAD_PMP;
2160
2161        /*
2162         * We must not change the port interrupt mask register if the
2163         * port is marked frozen, the value in pp->intr_mask will be
2164         * restored later when the port is thawed.
2165         *
2166         * Note that during initialization, the port is marked as
2167         * frozen since the irq handler is not yet registered.
2168         */
2169        if (!(ap->pflags & ATA_PFLAG_FROZEN))
2170                writel(pp->intr_mask, port_mmio + PORT_IRQ_MASK);
2171}
2172
2173static void ahci_pmp_detach(struct ata_port *ap)
2174{
2175        void __iomem *port_mmio = ahci_port_base(ap);
2176        struct ahci_port_priv *pp = ap->private_data;
2177        u32 cmd;
2178
2179        ahci_disable_fbs(ap);
2180
2181        cmd = readl(port_mmio + PORT_CMD);
2182        cmd &= ~PORT_CMD_PMP;
2183        writel(cmd, port_mmio + PORT_CMD);
2184
2185        pp->intr_mask &= ~PORT_IRQ_BAD_PMP;
2186
2187        /* see comment above in ahci_pmp_attach() */
2188        if (!(ap->pflags & ATA_PFLAG_FROZEN))
2189                writel(pp->intr_mask, port_mmio + PORT_IRQ_MASK);
2190}
2191
2192int ahci_port_resume(struct ata_port *ap)
2193{
2194        ahci_power_up(ap);
2195        ahci_start_port(ap);
2196
2197        if (sata_pmp_attached(ap))
2198                ahci_pmp_attach(ap);
2199        else
2200                ahci_pmp_detach(ap);
2201
2202        return 0;
2203}
2204EXPORT_SYMBOL_GPL(ahci_port_resume);
2205
2206#ifdef CONFIG_PM
2207static int ahci_port_suspend(struct ata_port *ap, pm_message_t mesg)
2208{
2209        const char *emsg = NULL;
2210        int rc;
2211
2212        rc = ahci_deinit_port(ap, &emsg);
2213        if (rc == 0)
2214                ahci_power_down(ap);
2215        else {
2216                ata_port_err(ap, "%s (%d)\n", emsg, rc);
2217                ata_port_freeze(ap);
2218        }
2219
2220        return rc;
2221}
2222#endif
2223
2224static int ahci_port_start(struct ata_port *ap)
2225{
2226        struct ahci_host_priv *hpriv = ap->host->private_data;
2227        struct device *dev = ap->host->dev;
2228        struct ahci_port_priv *pp;
2229        void *mem;
2230        dma_addr_t mem_dma;
2231        size_t dma_sz, rx_fis_sz;
2232
2233        pp = devm_kzalloc(dev, sizeof(*pp), GFP_KERNEL);
2234        if (!pp)
2235                return -ENOMEM;
2236
2237        /* check FBS capability */
2238        if ((hpriv->cap & HOST_CAP_FBS) && sata_pmp_supported(ap)) {
2239                void __iomem *port_mmio = ahci_port_base(ap);
2240                u32 cmd = readl(port_mmio + PORT_CMD);
2241                if (cmd & PORT_CMD_FBSCP)
2242                        pp->fbs_supported = true;
2243                else if (hpriv->flags & AHCI_HFLAG_YES_FBS) {
2244                        dev_info(dev, "port %d can do FBS, forcing FBSCP\n",
2245                                 ap->port_no);
2246                        pp->fbs_supported = true;
2247                } else
2248                        dev_warn(dev, "port %d is not capable of FBS\n",
2249                                 ap->port_no);
2250        }
2251
2252        if (pp->fbs_supported) {
2253                dma_sz = AHCI_PORT_PRIV_FBS_DMA_SZ;
2254                rx_fis_sz = AHCI_RX_FIS_SZ * 16;
2255        } else {
2256                dma_sz = AHCI_PORT_PRIV_DMA_SZ;
2257                rx_fis_sz = AHCI_RX_FIS_SZ;
2258        }
2259
2260        mem = dmam_alloc_coherent(dev, dma_sz, &mem_dma, GFP_KERNEL);
2261        if (!mem)
2262                return -ENOMEM;
2263        memset(mem, 0, dma_sz);
2264
2265        /*
2266         * First item in chunk of DMA memory: 32-slot command table,
2267         * 32 bytes each in size
2268         */
2269        pp->cmd_slot = mem;
2270        pp->cmd_slot_dma = mem_dma;
2271
2272        mem += AHCI_CMD_SLOT_SZ;
2273        mem_dma += AHCI_CMD_SLOT_SZ;
2274
2275        /*
2276         * Second item: Received-FIS area
2277         */
2278        pp->rx_fis = mem;
2279        pp->rx_fis_dma = mem_dma;
2280
2281        mem += rx_fis_sz;
2282        mem_dma += rx_fis_sz;
2283
2284        /*
2285         * Third item: data area for storing a single command
2286         * and its scatter-gather table
2287         */
2288        pp->cmd_tbl = mem;
2289        pp->cmd_tbl_dma = mem_dma;
2290
2291        /*
2292         * Save off initial list of interrupts to be enabled.
2293         * This could be changed later
2294         */
2295        pp->intr_mask = DEF_PORT_IRQ;
2296
2297        /*
2298         * Switch to per-port locking in case each port has its own MSI vector.
2299         */
2300        if ((hpriv->flags & AHCI_HFLAG_MULTI_MSI)) {
2301                spin_lock_init(&pp->lock);
2302                ap->lock = &pp->lock;
2303        }
2304
2305        ap->private_data = pp;
2306
2307        /* engage engines, captain */
2308        return ahci_port_resume(ap);
2309}
2310
2311static void ahci_port_stop(struct ata_port *ap)
2312{
2313        const char *emsg = NULL;
2314        int rc;
2315
2316        /* de-initialize port */
2317        rc = ahci_deinit_port(ap, &emsg);
2318        if (rc)
2319                ata_port_warn(ap, "%s (%d)\n", emsg, rc);
2320}
2321
2322void ahci_print_info(struct ata_host *host, const char *scc_s)
2323{
2324        struct ahci_host_priv *hpriv = host->private_data;
2325        void __iomem *mmio = hpriv->mmio;
2326        u32 vers, cap, cap2, impl, speed;
2327        const char *speed_s;
2328
2329        vers = readl(mmio + HOST_VERSION);
2330        cap = hpriv->cap;
2331        cap2 = hpriv->cap2;
2332        impl = hpriv->port_map;
2333
2334        speed = (cap >> 20) & 0xf;
2335        if (speed == 1)
2336                speed_s = "1.5";
2337        else if (speed == 2)
2338                speed_s = "3";
2339        else if (speed == 3)
2340                speed_s = "6";
2341        else
2342                speed_s = "?";
2343
2344        dev_info(host->dev,
2345                "AHCI %02x%02x.%02x%02x "
2346                "%u slots %u ports %s Gbps 0x%x impl %s mode\n"
2347                ,
2348
2349                (vers >> 24) & 0xff,
2350                (vers >> 16) & 0xff,
2351                (vers >> 8) & 0xff,
2352                vers & 0xff,
2353
2354                ((cap >> 8) & 0x1f) + 1,
2355                (cap & 0x1f) + 1,
2356                speed_s,
2357                impl,
2358                scc_s);
2359
2360        dev_info(host->dev,
2361                "flags: "
2362                "%s%s%s%s%s%s%s"
2363                "%s%s%s%s%s%s%s"
2364                "%s%s%s%s%s%s%s"
2365                "%s%s\n"
2366                ,
2367
2368                cap & HOST_CAP_64 ? "64bit " : "",
2369                cap & HOST_CAP_NCQ ? "ncq " : "",
2370                cap & HOST_CAP_SNTF ? "sntf " : "",
2371                cap & HOST_CAP_MPS ? "ilck " : "",
2372                cap & HOST_CAP_SSS ? "stag " : "",
2373                cap & HOST_CAP_ALPM ? "pm " : "",
2374                cap & HOST_CAP_LED ? "led " : "",
2375                cap & HOST_CAP_CLO ? "clo " : "",
2376                cap & HOST_CAP_ONLY ? "only " : "",
2377                cap & HOST_CAP_PMP ? "pmp " : "",
2378                cap & HOST_CAP_FBS ? "fbs " : "",
2379                cap & HOST_CAP_PIO_MULTI ? "pio " : "",
2380                cap & HOST_CAP_SSC ? "slum " : "",
2381                cap & HOST_CAP_PART ? "part " : "",
2382                cap & HOST_CAP_CCC ? "ccc " : "",
2383                cap & HOST_CAP_EMS ? "ems " : "",
2384                cap & HOST_CAP_SXS ? "sxs " : "",
2385                cap2 & HOST_CAP2_DESO ? "deso " : "",
2386                cap2 & HOST_CAP2_SADM ? "sadm " : "",
2387                cap2 & HOST_CAP2_SDS ? "sds " : "",
2388                cap2 & HOST_CAP2_APST ? "apst " : "",
2389                cap2 & HOST_CAP2_NVMHCI ? "nvmp " : "",
2390                cap2 & HOST_CAP2_BOH ? "boh " : ""
2391                );
2392}
2393EXPORT_SYMBOL_GPL(ahci_print_info);
2394
2395void ahci_set_em_messages(struct ahci_host_priv *hpriv,
2396                          struct ata_port_info *pi)
2397{
2398        u8 messages;
2399        void __iomem *mmio = hpriv->mmio;
2400        u32 em_loc = readl(mmio + HOST_EM_LOC);
2401        u32 em_ctl = readl(mmio + HOST_EM_CTL);
2402
2403        if (!ahci_em_messages || !(hpriv->cap & HOST_CAP_EMS))
2404                return;
2405
2406        messages = (em_ctl & EM_CTRL_MSG_TYPE) >> 16;
2407
2408        if (messages) {
2409                /* store em_loc */
2410                hpriv->em_loc = ((em_loc >> 16) * 4);
2411                hpriv->em_buf_sz = ((em_loc & 0xff) * 4);
2412                hpriv->em_msg_type = messages;
2413                pi->flags |= ATA_FLAG_EM;
2414                if (!(em_ctl & EM_CTL_ALHD))
2415                        pi->flags |= ATA_FLAG_SW_ACTIVITY;
2416        }
2417}
2418EXPORT_SYMBOL_GPL(ahci_set_em_messages);
2419
2420MODULE_AUTHOR("Jeff Garzik");
2421MODULE_DESCRIPTION("Common AHCI SATA low-level routines");
2422MODULE_LICENSE("GPL");
2423
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