drivers/ata/pata_it821x.c

   1 /*
   2  * pata_it821x.c        - IT821x PATA for new ATA layer
   3  *                        (C) 2005 Red Hat Inc
   4  *                        Alan Cox <alan@redhat.com>
   5  *                        (C) 2007 Bartlomiej Zolnierkiewicz
   6  *
   7  * based upon
   8  *
   9  * it821x.c
  10  *
  11  * linux/drivers/ide/pci/it821x.c               Version 0.09    December 2004
  12  *
  13  * Copyright (C) 2004           Red Hat <alan@redhat.com>
  14  *
  15  *  May be copied or modified under the terms of the GNU General Public License
  16  *  Based in part on the ITE vendor provided SCSI driver.
  17  *
  18  *  Documentation available from
  19  *      http://www.ite.com.tw/pc/IT8212F_V04.pdf
  20  *  Some other documents are NDA.
  21  *
  22  *  The ITE8212 isn't exactly a standard IDE controller. It has two
  23  *  modes. In pass through mode then it is an IDE controller. In its smart
  24  *  mode its actually quite a capable hardware raid controller disguised
  25  *  as an IDE controller. Smart mode only understands DMA read/write and
  26  *  identify, none of the fancier commands apply. The IT8211 is identical
  27  *  in other respects but lacks the raid mode.
  28  *
  29  *  Errata:
  30  *  o   Rev 0x10 also requires master/slave hold the same DMA timings and
  31  *      cannot do ATAPI MWDMA.
  32  *  o   The identify data for raid volumes lacks CHS info (technically ok)
  33  *      but also fails to set the LBA28 and other bits. We fix these in
  34  *      the IDE probe quirk code.
  35  *  o   If you write LBA48 sized I/O's (ie > 256 sector) in smart mode
  36  *      raid then the controller firmware dies
  37  *  o   Smart mode without RAID doesn't clear all the necessary identify
  38  *      bits to reduce the command set to the one used
  39  *
  40  *  This has a few impacts on the driver
  41  *  - In pass through mode we do all the work you would expect
  42  *  - In smart mode the clocking set up is done by the controller generally
  43  *    but we must watch the other limits and filter.
  44  *  - There are a few extra vendor commands that actually talk to the
  45  *    controller but only work PIO with no IRQ.
  46  *
  47  *  Vendor areas of the identify block in smart mode are used for the
  48  *  timing and policy set up. Each HDD in raid mode also has a serial
  49  *  block on the disk. The hardware extra commands are get/set chip status,
  50  *  rebuild, get rebuild status.
  51  *
  52  *  In Linux the driver supports pass through mode as if the device was
  53  *  just another IDE controller. If the smart mode is running then
  54  *  volumes are managed by the controller firmware and each IDE "disk"
  55  *  is a raid volume. Even more cute - the controller can do automated
  56  *  hotplug and rebuild.
  57  *
  58  *  The pass through controller itself is a little demented. It has a
  59  *  flaw that it has a single set of PIO/MWDMA timings per channel so
  60  *  non UDMA devices restrict each others performance. It also has a
  61  *  single clock source per channel so mixed UDMA100/133 performance
  62  *  isn't perfect and we have to pick a clock. Thankfully none of this
  63  *  matters in smart mode. ATAPI DMA is not currently supported.
  64  *
  65  *  It seems the smart mode is a win for RAID1/RAID10 but otherwise not.
  66  *
  67  *  TODO
  68  *      -       ATAPI and other speed filtering
  69  *      -       RAID configuration ioctls
  70  */
  71
  72 #include <linux/kernel.h>
  73 #include <linux/module.h>
  74 #include <linux/pci.h>
  75 #include <linux/init.h>
  76 #include <linux/blkdev.h>
  77 #include <linux/delay.h>
  78 #include <scsi/scsi_host.h>
  79 #include <linux/libata.h>
  80
  81
  82 #define DRV_NAME "pata_it821x"
  83 #define DRV_VERSION "0.3.8"
  84
  85 struct it821x_dev
  86 {
  87         unsigned int smart:1,           /* Are we in smart raid mode */
  88                 timing10:1;             /* Rev 0x10 */
  89         u8      clock_mode;             /* 0, ATA_50 or ATA_66 */
  90         u8      want[2][2];             /* Mode/Pri log for master slave */
  91         /* We need these for switching the clock when DMA goes on/off
  92            The high byte is the 66Mhz timing */
  93         u16     pio[2];                 /* Cached PIO values */
  94         u16     mwdma[2];               /* Cached MWDMA values */
  95         u16     udma[2];                /* Cached UDMA values (per drive) */
  96         u16     last_device;            /* Master or slave loaded ? */
  97 };
  98
  99 #define ATA_66          0
 100 #define ATA_50          1
 101 #define ATA_ANY         2
 102
 103 #define UDMA_OFF        0
 104 #define MWDMA_OFF       0
 105
 106 /*
 107  *      We allow users to force the card into non raid mode without
 108  *      flashing the alternative BIOS. This is also necessary right now
 109  *      for embedded platforms that cannot run a PC BIOS but are using this
 110  *      device.
 111  */
 112
 113 static int it8212_noraid;
 114
 115 /**
 116  *      it821x_program  -       program the PIO/MWDMA registers
 117  *      @ap: ATA port
 118  *      @adev: Device to program
 119  *      @timing: Timing value (66Mhz in top 8bits, 50 in the low 8)
 120  *
 121  *      Program the PIO/MWDMA timing for this channel according to the
 122  *      current clock. These share the same register so are managed by
 123  *      the DMA start/stop sequence as with the old driver.
 124  */
 125
 126 static void it821x_program(struct ata_port *ap, struct ata_device *adev, u16 timing)
 127 {
 128         struct pci_dev *pdev = to_pci_dev(ap->host->dev);
 129         struct it821x_dev *itdev = ap->private_data;
 130         int channel = ap->port_no;
 131         u8 conf;
 132
 133         /* Program PIO/MWDMA timing bits */
 134         if (itdev->clock_mode == ATA_66)
 135                 conf = timing >> 8;
 136         else
 137                 conf = timing & 0xFF;
 138         pci_write_config_byte(pdev, 0x54 + 4 * channel, conf);
 139 }
 140
 141
 142 /**
 143  *      it821x_program_udma     -       program the UDMA registers
 144  *      @ap: ATA port
 145  *      @adev: ATA device to update
 146  *      @timing: Timing bits. Top 8 are for 66Mhz bottom for 50Mhz
 147  *
 148  *      Program the UDMA timing for this drive according to the
 149  *      current clock. Handles the dual clocks and also knows about
 150  *      the errata on the 0x10 revision. The UDMA errata is partly handled
 151  *      here and partly in start_dma.
 152  */
 153
 154 static void it821x_program_udma(struct ata_port *ap, struct ata_device *adev, u16 timing)
 155 {
 156         struct it821x_dev *itdev = ap->private_data;
 157         struct pci_dev *pdev = to_pci_dev(ap->host->dev);
 158         int channel = ap->port_no;
 159         int unit = adev->devno;
 160         u8 conf;
 161
 162         /* Program UDMA timing bits */
 163         if (itdev->clock_mode == ATA_66)
 164                 conf = timing >> 8;
 165         else
 166                 conf = timing & 0xFF;
 167         if (itdev->timing10 == 0)
 168                 pci_write_config_byte(pdev, 0x56 + 4 * channel + unit, conf);
 169         else {
 170                 /* Early revision must be programmed for both together */
 171                 pci_write_config_byte(pdev, 0x56 + 4 * channel, conf);
 172                 pci_write_config_byte(pdev, 0x56 + 4 * channel + 1, conf);
 173         }
 174 }
 175
 176 /**
 177  *      it821x_clock_strategy
 178  *      @ap: ATA interface
 179  *      @adev: ATA device being updated
 180  *
 181  *      Select between the 50 and 66Mhz base clocks to get the best
 182  *      results for this interface.
 183  */
 184
 185 static void it821x_clock_strategy(struct ata_port *ap, struct ata_device *adev)
 186 {
 187         struct pci_dev *pdev = to_pci_dev(ap->host->dev);
 188         struct it821x_dev *itdev = ap->private_data;
 189         u8 unit = adev->devno;
 190         struct ata_device *pair = ata_dev_pair(adev);
 191
 192         int clock, altclock;
 193         u8 v;
 194         int sel = 0;
 195
 196         /* Look for the most wanted clocking */
 197         if (itdev->want[0][0] > itdev->want[1][0]) {
 198                 clock = itdev->want[0][1];
 199                 altclock = itdev->want[1][1];
 200         } else {
 201                 clock = itdev->want[1][1];
 202                 altclock = itdev->want[0][1];
 203         }
 204
 205         /* Master doesn't care does the slave ? */
 206         if (clock == ATA_ANY)
 207                 clock = altclock;
 208
 209         /* Nobody cares - keep the same clock */
 210         if (clock == ATA_ANY)
 211                 return;
 212         /* No change */
 213         if (clock == itdev->clock_mode)
 214                 return;
 215
 216         /* Load this into the controller */
 217         if (clock == ATA_66)
 218                 itdev->clock_mode = ATA_66;
 219         else {
 220                 itdev->clock_mode = ATA_50;
 221                 sel = 1;
 222         }
 223         pci_read_config_byte(pdev, 0x50, &v);
 224         v &= ~(1 << (1 + ap->port_no));
 225         v |= sel << (1 + ap->port_no);
 226         pci_write_config_byte(pdev, 0x50, v);
 227
 228         /*
 229          *      Reprogram the UDMA/PIO of the pair drive for the switch
 230          *      MWDMA will be dealt with by the dma switcher
 231          */
 232         if (pair && itdev->udma[1-unit] != UDMA_OFF) {
 233                 it821x_program_udma(ap, pair, itdev->udma[1-unit]);
 234                 it821x_program(ap, pair, itdev->pio[1-unit]);
 235         }
 236         /*
 237          *      Reprogram the UDMA/PIO of our drive for the switch.
 238          *      MWDMA will be dealt with by the dma switcher
 239          */
 240         if (itdev->udma[unit] != UDMA_OFF) {
 241                 it821x_program_udma(ap, adev, itdev->udma[unit]);
 242                 it821x_program(ap, adev, itdev->pio[unit]);
 243         }
 244 }
 245
 246 /**
 247  *      it821x_passthru_set_piomode     -       set PIO mode data
 248  *      @ap: ATA interface
 249  *      @adev: ATA device
 250  *
 251  *      Configure for PIO mode. This is complicated as the register is
 252  *      shared by PIO and MWDMA and for both channels.
 253  */
 254
 255 static void it821x_passthru_set_piomode(struct ata_port *ap, struct ata_device *adev)
 256 {
 257         /* Spec says 89 ref driver uses 88 */
 258         static const u16 pio[]  = { 0xAA88, 0xA382, 0xA181, 0x3332, 0x3121 };
 259         static const u8 pio_want[]    = { ATA_66, ATA_66, ATA_66, ATA_66, ATA_ANY };
 260
 261         struct it821x_dev *itdev = ap->private_data;
 262         int unit = adev->devno;
 263         int mode_wanted = adev->pio_mode - XFER_PIO_0;
 264
 265         /* We prefer 66Mhz clock for PIO 0-3, don't care for PIO4 */
 266         itdev->want[unit][1] = pio_want[mode_wanted];
 267         itdev->want[unit][0] = 1;       /* PIO is lowest priority */
 268         itdev->pio[unit] = pio[mode_wanted];
 269         it821x_clock_strategy(ap, adev);
 270         it821x_program(ap, adev, itdev->pio[unit]);
 271 }
 272
 273 /**
 274  *      it821x_passthru_set_dmamode     -       set initial DMA mode data
 275  *      @ap: ATA interface
 276  *      @adev: ATA device
 277  *
 278  *      Set up the DMA modes. The actions taken depend heavily on the mode
 279  *      to use. If UDMA is used as is hopefully the usual case then the
 280  *      timing register is private and we need only consider the clock. If
 281  *      we are using MWDMA then we have to manage the setting ourself as
 282  *      we switch devices and mode.
 283  */
 284
 285 static void it821x_passthru_set_dmamode(struct ata_port *ap, struct ata_device *adev)
 286 {
 287         static const u16 dma[]  =       { 0x8866, 0x3222, 0x3121 };
 288         static const u8 mwdma_want[] =  { ATA_ANY, ATA_66, ATA_ANY };
 289         static const u16 udma[] =       { 0x4433, 0x4231, 0x3121, 0x2121, 0x1111, 0x2211, 0x1111 };
 290         static const u8 udma_want[] =   { ATA_ANY, ATA_50, ATA_ANY, ATA_66, ATA_66, ATA_50, ATA_66 };
 291
 292         struct pci_dev *pdev = to_pci_dev(ap->host->dev);
 293         struct it821x_dev *itdev = ap->private_data;
 294         int channel = ap->port_no;
 295         int unit = adev->devno;
 296         u8 conf;
 297
 298         if (adev->dma_mode >= XFER_UDMA_0) {
 299                 int mode_wanted = adev->dma_mode - XFER_UDMA_0;
 300
 301                 itdev->want[unit][1] = udma_want[mode_wanted];
 302                 itdev->want[unit][0] = 3;       /* UDMA is high priority */
 303                 itdev->mwdma[unit] = MWDMA_OFF;
 304                 itdev->udma[unit] = udma[mode_wanted];
 305                 if (mode_wanted >= 5)
 306                         itdev->udma[unit] |= 0x8080;    /* UDMA 5/6 select on */
 307
 308                 /* UDMA on. Again revision 0x10 must do the pair */
 309                 pci_read_config_byte(pdev, 0x50, &conf);
 310                 if (itdev->timing10)
 311                         conf &= channel ? 0x9F: 0xE7;
 312                 else
 313                         conf &= ~ (1 << (3 + 2 * channel + unit));
 314                 pci_write_config_byte(pdev, 0x50, conf);
 315                 it821x_clock_strategy(ap, adev);
 316                 it821x_program_udma(ap, adev, itdev->udma[unit]);
 317         } else {
 318                 int mode_wanted = adev->dma_mode - XFER_MW_DMA_0;
 319
 320                 itdev->want[unit][1] = mwdma_want[mode_wanted];
 321                 itdev->want[unit][0] = 2;       /* MWDMA is low priority */
 322                 itdev->mwdma[unit] = dma[mode_wanted];
 323                 itdev->udma[unit] = UDMA_OFF;
 324
 325                 /* UDMA bits off - Revision 0x10 do them in pairs */
 326                 pci_read_config_byte(pdev, 0x50, &conf);
 327                 if (itdev->timing10)
 328                         conf |= channel ? 0x60: 0x18;
 329                 else
 330                         conf |= 1 << (3 + 2 * channel + unit);
 331                 pci_write_config_byte(pdev, 0x50, conf);
 332                 it821x_clock_strategy(ap, adev);
 333         }
 334 }
 335
 336 /**
 337  *      it821x_passthru_dma_start       -       DMA start callback
 338  *      @qc: Command in progress
 339  *
 340  *      Usually drivers set the DMA timing at the point the set_dmamode call
 341  *      is made. IT821x however requires we load new timings on the
 342  *      transitions in some cases.
 343  */
 344
 345 static void it821x_passthru_bmdma_start(struct ata_queued_cmd *qc)
 346 {
 347         struct ata_port *ap = qc->ap;
 348         struct ata_device *adev = qc->dev;
 349         struct it821x_dev *itdev = ap->private_data;
 350         int unit = adev->devno;
 351
 352         if (itdev->mwdma[unit] != MWDMA_OFF)
 353                 it821x_program(ap, adev, itdev->mwdma[unit]);
 354         else if (itdev->udma[unit] != UDMA_OFF && itdev->timing10)
 355                 it821x_program_udma(ap, adev, itdev->udma[unit]);
 356         ata_bmdma_start(qc);
 357 }
 358
 359 /**
 360  *      it821x_passthru_dma_stop        -       DMA stop callback
 361  *      @qc: ATA command
 362  *
 363  *      We loaded new timings in dma_start, as a result we need to restore
 364  *      the PIO timings in dma_stop so that the next command issue gets the
 365  *      right clock values.
 366  */
 367
 368 static void it821x_passthru_bmdma_stop(struct ata_queued_cmd *qc)
 369 {
 370         struct ata_port *ap = qc->ap;
 371         struct ata_device *adev = qc->dev;
 372         struct it821x_dev *itdev = ap->private_data;
 373         int unit = adev->devno;
 374
 375         ata_bmdma_stop(qc);
 376         if (itdev->mwdma[unit] != MWDMA_OFF)
 377                 it821x_program(ap, adev, itdev->pio[unit]);
 378 }
 379
 380
 381 /**
 382  *      it821x_passthru_dev_select      -       Select master/slave
 383  *      @ap: ATA port
 384  *      @device: Device number (not pointer)
 385  *
 386  *      Device selection hook. If necessary perform clock switching
 387  */
 388
 389 static void it821x_passthru_dev_select(struct ata_port *ap,
 390                                        unsigned int device)
 391 {
 392         struct it821x_dev *itdev = ap->private_data;
 393         if (itdev && device != itdev->last_device) {
 394                 struct ata_device *adev = &ap->link.device[device];
 395                 it821x_program(ap, adev, itdev->pio[adev->devno]);
 396                 itdev->last_device = device;
 397         }
 398         ata_sff_dev_select(ap, device);
 399 }
 400
 401 /**
 402  *      it821x_smart_qc_issue           -       wrap qc issue prot
 403  *      @qc: command
 404  *
 405  *      Wrap the command issue sequence for the IT821x. We need to
 406  *      perform out own device selection timing loads before the
 407  *      usual happenings kick off
 408  */
 409
 410 static unsigned int it821x_smart_qc_issue(struct ata_queued_cmd *qc)
 411 {
 412         switch(qc->tf.command)
 413         {
 414                 /* Commands the firmware supports */
 415                 case ATA_CMD_READ:
 416                 case ATA_CMD_READ_EXT:
 417                 case ATA_CMD_WRITE:
 418                 case ATA_CMD_WRITE_EXT:
 419                 case ATA_CMD_PIO_READ:
 420                 case ATA_CMD_PIO_READ_EXT:
 421                 case ATA_CMD_PIO_WRITE:
 422                 case ATA_CMD_PIO_WRITE_EXT:
 423                 case ATA_CMD_READ_MULTI:
 424                 case ATA_CMD_READ_MULTI_EXT:
 425                 case ATA_CMD_WRITE_MULTI:
 426                 case ATA_CMD_WRITE_MULTI_EXT:
 427                 case ATA_CMD_ID_ATA:
 428                 /* Arguably should just no-op this one */
 429                 case ATA_CMD_SET_FEATURES:
 430                         return ata_sff_qc_issue(qc);
 431         }
 432         printk(KERN_DEBUG "it821x: can't process command 0x%02X\n", qc->tf.command);
 433         return AC_ERR_DEV;
 434 }
 435
 436 /**
 437  *      it821x_passthru_qc_issue        -       wrap qc issue prot
 438  *      @qc: command
 439  *
 440  *      Wrap the command issue sequence for the IT821x. We need to
 441  *      perform out own device selection timing loads before the
 442  *      usual happenings kick off
 443  */
 444
 445 static unsigned int it821x_passthru_qc_issue(struct ata_queued_cmd *qc)
 446 {
 447         it821x_passthru_dev_select(qc->ap, qc->dev->devno);
 448         return ata_sff_qc_issue(qc);
 449 }
 450
 451 /**
 452  *      it821x_smart_set_mode   -       mode setting
 453  *      @link: interface to set up
 454  *      @unused: device that failed (error only)
 455  *
 456  *      Use a non standard set_mode function. We don't want to be tuned.
 457  *      The BIOS configured everything. Our job is not to fiddle. We
 458  *      read the dma enabled bits from the PCI configuration of the device
 459  *      and respect them.
 460  */
 461
 462 static int it821x_smart_set_mode(struct ata_link *link, struct ata_device **unused)
 463 {
 464         struct ata_device *dev;
 465
 466         ata_link_for_each_dev(dev, link) {
 467                 if (ata_dev_enabled(dev)) {
 468                         /* We don't really care */
 469                         dev->pio_mode = XFER_PIO_0;
 470                         dev->dma_mode = XFER_MW_DMA_0;
 471                         /* We do need the right mode information for DMA or PIO
 472                            and this comes from the current configuration flags */
 473                         if (ata_id_has_dma(dev->id)) {
 474                                 ata_dev_printk(dev, KERN_INFO, "configured for DMA\n");
 475                                 dev->xfer_mode = XFER_MW_DMA_0;
 476                                 dev->xfer_shift = ATA_SHIFT_MWDMA;
 477                                 dev->flags &= ~ATA_DFLAG_PIO;
 478                         } else {
 479                                 ata_dev_printk(dev, KERN_INFO, "configured for PIO\n");
 480                                 dev->xfer_mode = XFER_PIO_0;
 481                                 dev->xfer_shift = ATA_SHIFT_PIO;
 482                                 dev->flags |= ATA_DFLAG_PIO;
 483                         }
 484                 }
 485         }
 486         return 0;
 487 }
 488
 489 /**
 490  *      it821x_dev_config       -       Called each device identify
 491  *      @adev: Device that has just been identified
 492  *
 493  *      Perform the initial setup needed for each device that is chip
 494  *      special. In our case we need to lock the sector count to avoid
 495  *      blowing the brains out of the firmware with large LBA48 requests
 496  *
 497  *      FIXME: When FUA appears we need to block FUA too. And SMART and
 498  *      basically we need to filter commands for this chip.
 499  */
 500
 501 static void it821x_dev_config(struct ata_device *adev)
 502 {
 503         unsigned char model_num[ATA_ID_PROD_LEN + 1];
 504
 505         ata_id_c_string(adev->id, model_num, ATA_ID_PROD, sizeof(model_num));
 506
 507         if (adev->max_sectors > 255)
 508                 adev->max_sectors = 255;
 509
 510         if (strstr(model_num, "Integrated Technology Express")) {
 511                 /* RAID mode */
 512                 printk(KERN_INFO "IT821x %sRAID%d volume",
 513                         adev->id[147]?"Bootable ":"",
 514                         adev->id[129]);
 515                 if (adev->id[129] != 1)
 516                         printk("(%dK stripe)", adev->id[146]);
 517                 printk(".\n");
 518         }
 519         /* This is a controller firmware triggered funny, don't
 520            report the drive faulty! */
 521         adev->horkage &= ~ATA_HORKAGE_DIAGNOSTIC;
 522 }
 523
 524 /**
 525  *      it821x_ident_hack       -       Hack identify data up
 526  *      @ap: Port
 527  *
 528  *      Walk the devices on this firmware driven port and slightly
 529  *      mash the identify data to stop us and common tools trying to
 530  *      use features not firmware supported. The firmware itself does
 531  *      some masking (eg SMART) but not enough.
 532  *
 533  *      This is a bit of an abuse of the cable method, but it is the
 534  *      only method called at the right time. We could modify the libata
 535  *      core specifically for ident hacking but while we have one offender
 536  *      it seems better to keep the fallout localised.
 537  */
 538
 539 static int it821x_ident_hack(struct ata_port *ap)
 540 {
 541         struct ata_device *adev;
 542         ata_link_for_each_dev(adev, &ap->link) {
 543                 if (ata_dev_enabled(adev)) {
 544                         adev->id[84] &= ~(1 << 6);      /* No FUA */
 545                         adev->id[85] &= ~(1 << 10);     /* No HPA */
 546                         adev->id[76] = 0;               /* No NCQ/AN etc */
 547                 }
 548         }
 549         return ata_cable_unknown(ap);
 550 }
 551
 552
 553 /**
 554  *      it821x_check_atapi_dma  -       ATAPI DMA handler
 555  *      @qc: Command we are about to issue
 556  *
 557  *      Decide if this ATAPI command can be issued by DMA on this
 558  *      controller. Return 0 if it can be.
 559  */
 560
 561 static int it821x_check_atapi_dma(struct ata_queued_cmd *qc)
 562 {
 563         struct ata_port *ap = qc->ap;
 564         struct it821x_dev *itdev = ap->private_data;
 565
 566         /* Only use dma for transfers to/from the media. */
 567         if (ata_qc_raw_nbytes(qc) < 2048)
 568                 return -EOPNOTSUPP;
 569
 570         /* No ATAPI DMA in smart mode */
 571         if (itdev->smart)
 572                 return -EOPNOTSUPP;
 573         /* No ATAPI DMA on rev 10 */
 574         if (itdev->timing10)
 575                 return -EOPNOTSUPP;
 576         /* Cool */
 577         return 0;
 578 }
 579
 580
 581 /**
 582  *      it821x_port_start       -       port setup
 583  *      @ap: ATA port being set up
 584  *
 585  *      The it821x needs to maintain private data structures and also to
 586  *      use the standard PCI interface which lacks support for this
 587  *      functionality. We instead set up the private data on the port
 588  *      start hook, and tear it down on port stop
 589  */
 590
 591 static int it821x_port_start(struct ata_port *ap)
 592 {
 593         struct pci_dev *pdev = to_pci_dev(ap->host->dev);
 594         struct it821x_dev *itdev;
 595         u8 conf;
 596
 597         int ret = ata_sff_port_start(ap);
 598         if (ret < 0)
 599                 return ret;
 600
 601         itdev = devm_kzalloc(&pdev->dev, sizeof(struct it821x_dev), GFP_KERNEL);
 602         if (itdev == NULL)
 603                 return -ENOMEM;
 604         ap->private_data = itdev;
 605
 606         pci_read_config_byte(pdev, 0x50, &conf);
 607
 608         if (conf & 1) {
 609                 itdev->smart = 1;
 610                 /* Long I/O's although allowed in LBA48 space cause the
 611                    onboard firmware to enter the twighlight zone */
 612                 /* No ATAPI DMA in this mode either */
 613         }
 614         /* Pull the current clocks from 0x50 */
 615         if (conf & (1 << (1 + ap->port_no)))
 616                 itdev->clock_mode = ATA_50;
 617         else
 618                 itdev->clock_mode = ATA_66;
 619
 620         itdev->want[0][1] = ATA_ANY;
 621         itdev->want[1][1] = ATA_ANY;
 622         itdev->last_device = -1;
 623
 624         if (pdev->revision == 0x10) {
 625                 itdev->timing10 = 1;
 626                 /* Need to disable ATAPI DMA for this case */
 627                 if (!itdev->smart)
 628                         printk(KERN_WARNING DRV_NAME": Revision 0x10, workarounds activated.\n");
 629         }
 630
 631         return 0;
 632 }
 633
 634 static struct scsi_host_template it821x_sht = {
 635         ATA_BMDMA_SHT(DRV_NAME),
 636 };
 637
 638 static struct ata_port_operations it821x_smart_port_ops = {
 639         .inherits       = &ata_bmdma_port_ops,
 640
 641         .check_atapi_dma= it821x_check_atapi_dma,
 642         .qc_issue       = it821x_smart_qc_issue,
 643
 644         .cable_detect   = it821x_ident_hack,
 645         .set_mode       = it821x_smart_set_mode,
 646         .dev_config     = it821x_dev_config,
 647
 648         .port_start     = it821x_port_start,
 649 };
 650
 651 static struct ata_port_operations it821x_passthru_port_ops = {
 652         .inherits       = &ata_bmdma_port_ops,
 653
 654         .check_atapi_dma= it821x_check_atapi_dma,
 655         .sff_dev_select = it821x_passthru_dev_select,
 656         .bmdma_start    = it821x_passthru_bmdma_start,
 657         .bmdma_stop     = it821x_passthru_bmdma_stop,
 658         .qc_issue       = it821x_passthru_qc_issue,
 659
 660         .cable_detect   = ata_cable_unknown,
 661         .set_piomode    = it821x_passthru_set_piomode,
 662         .set_dmamode    = it821x_passthru_set_dmamode,
 663
 664         .port_start     = it821x_port_start,
 665 };
 666
 667 static void it821x_disable_raid(struct pci_dev *pdev)
 668 {
 669         /* Reset local CPU, and set BIOS not ready */
 670         pci_write_config_byte(pdev, 0x5E, 0x01);
 671
 672         /* Set to bypass mode, and reset PCI bus */
 673         pci_write_config_byte(pdev, 0x50, 0x00);
 674         pci_write_config_word(pdev, PCI_COMMAND,
 675                               PCI_COMMAND_PARITY | PCI_COMMAND_IO |
 676                               PCI_COMMAND_MEMORY | PCI_COMMAND_MASTER);
 677         pci_write_config_word(pdev, 0x40, 0xA0F3);
 678
 679         pci_write_config_dword(pdev,0x4C, 0x02040204);
 680         pci_write_config_byte(pdev, 0x42, 0x36);
 681         pci_write_config_byte(pdev, PCI_LATENCY_TIMER, 0x20);
 682 }
 683
 684
 685 static int it821x_init_one(struct pci_dev *pdev, const struct pci_device_id *id)
 686 {
 687         u8 conf;
 688
 689         static const struct ata_port_info info_smart = {
 690                 .flags = ATA_FLAG_SLAVE_POSS,
 691                 .pio_mask = 0x1f,
 692                 .mwdma_mask = 0x07,
 693                 .port_ops = &it821x_smart_port_ops
 694         };
 695         static const struct ata_port_info info_passthru = {
 696                 .flags = ATA_FLAG_SLAVE_POSS,
 697                 .pio_mask = 0x1f,
 698                 .mwdma_mask = 0x07,
 699                 .udma_mask = ATA_UDMA6,
 700                 .port_ops = &it821x_passthru_port_ops
 701         };
 702
 703         const struct ata_port_info *ppi[] = { NULL, NULL };
 704         static char *mode[2] = { "pass through", "smart" };
 705         int rc;
 706
 707         rc = pcim_enable_device(pdev);
 708         if (rc)
 709                 return rc;
 710
 711         /* Force the card into bypass mode if so requested */
 712         if (it8212_noraid) {
 713                 printk(KERN_INFO DRV_NAME ": forcing bypass mode.\n");
 714                 it821x_disable_raid(pdev);
 715         }
 716         pci_read_config_byte(pdev, 0x50, &conf);
 717         conf &= 1;
 718
 719         printk(KERN_INFO DRV_NAME ": controller in %s mode.\n", mode[conf]);
 720         if (conf == 0)
 721                 ppi[0] = &info_passthru;
 722         else
 723                 ppi[0] = &info_smart;
 724
 725         return ata_pci_sff_init_one(pdev, ppi, &it821x_sht, NULL);
 726 }
 727
 728 #ifdef CONFIG_PM
 729 static int it821x_reinit_one(struct pci_dev *pdev)
 730 {
 731         struct ata_host *host = dev_get_drvdata(&pdev->dev);
 732         int rc;
 733
 734         rc = ata_pci_device_do_resume(pdev);
 735         if (rc)
 736                 return rc;
 737         /* Resume - turn raid back off if need be */
 738         if (it8212_noraid)
 739                 it821x_disable_raid(pdev);
 740         ata_host_resume(host);
 741         return rc;
 742 }
 743 #endif
 744
 745 static const struct pci_device_id it821x[] = {
 746         { PCI_VDEVICE(ITE, PCI_DEVICE_ID_ITE_8211), },
 747         { PCI_VDEVICE(ITE, PCI_DEVICE_ID_ITE_8212), },
 748
 749         { },
 750 };
 751
 752 static struct pci_driver it821x_pci_driver = {
 753         .name           = DRV_NAME,
 754         .id_table       = it821x,
 755         .probe          = it821x_init_one,
 756         .remove         = ata_pci_remove_one,
 757 #ifdef CONFIG_PM
 758         .suspend        = ata_pci_device_suspend,
 759         .resume         = it821x_reinit_one,
 760 #endif
 761 };
 762
 763 static int __init it821x_init(void)
 764 {
 765         return pci_register_driver(&it821x_pci_driver);
 766 }
 767
 768 static void __exit it821x_exit(void)
 769 {
 770         pci_unregister_driver(&it821x_pci_driver);
 771 }
 772
 773 MODULE_AUTHOR("Alan Cox");
 774 MODULE_DESCRIPTION("low-level driver for the IT8211/IT8212 IDE RAID controller");
 775 MODULE_LICENSE("GPL");
 776 MODULE_DEVICE_TABLE(pci, it821x);
 777 MODULE_VERSION(DRV_VERSION);
 778
 779
 780 module_param_named(noraid, it8212_noraid, int, S_IRUGO);
 781 MODULE_PARM_DESC(noraid, "Force card into bypass mode");
 782
 783 module_init(it821x_init);
 784 module_exit(it821x_exit);