drivers/ide/pci/piix.c

   1 /*
   2  *  Copyright (C) 1998-1999 Andrzej Krzysztofowicz, Author and Maintainer
   3  *  Copyright (C) 1998-2000 Andre Hedrick <andre@linux-ide.org>
   4  *  Copyright (C) 2003 Red Hat Inc <alan@redhat.com>
   5  *  Copyright (C) 2006-2007 MontaVista Software, Inc. <source@mvista.com>
   6  *
   7  *  May be copied or modified under the terms of the GNU General Public License
   8  *
   9  * Documentation:
  10  *
  11  *      Publically available from Intel web site. Errata documentation
  12  * is also publically available. As an aide to anyone hacking on this
  13  * driver the list of errata that are relevant is below.going back to
  14  * PIIX4. Older device documentation is now a bit tricky to find.
  15  *
  16  * Errata of note:
  17  *
  18  * Unfixable
  19  *      PIIX4    errata #9      - Only on ultra obscure hw
  20  *      ICH3     errata #13     - Not observed to affect real hw
  21  *                                by Intel
  22  *
  23  * Things we must deal with
  24  *      PIIX4   errata #10      - BM IDE hang with non UDMA
  25  *                                (must stop/start dma to recover)
  26  *      440MX   errata #15      - As PIIX4 errata #10
  27  *      PIIX4   errata #15      - Must not read control registers
  28  *                                during a PIO transfer
  29  *      440MX   errata #13      - As PIIX4 errata #15
  30  *      ICH2    errata #21      - DMA mode 0 doesn't work right
  31  *      ICH0/1  errata #55      - As ICH2 errata #21
  32  *      ICH2    spec c #9       - Extra operations needed to handle
  33  *                                drive hotswap [NOT YET SUPPORTED]
  34  *      ICH2    spec c #20      - IDE PRD must not cross a 64K boundary
  35  *                                and must be dword aligned
  36  *      ICH2    spec c #24      - UDMA mode 4,5 t85/86 should be 6ns not 3.3
  37  *
  38  * Should have been BIOS fixed:
  39  *      450NX:  errata #19      - DMA hangs on old 450NX
  40  *      450NX:  errata #20      - DMA hangs on old 450NX
  41  *      450NX:  errata #25      - Corruption with DMA on old 450NX
  42  *      ICH3    errata #15      - IDE deadlock under high load
  43  *                                (BIOS must set dev 31 fn 0 bit 23)
  44  *      ICH3    errata #18      - Don't use native mode
  45  */
  46
  47 #include <linux/types.h>
  48 #include <linux/module.h>
  49 #include <linux/kernel.h>
  50 #include <linux/pci.h>
  51 #include <linux/ide.h>
  52 #include <linux/init.h>
  53
  54 #include <asm/io.h>
  55
  56 #define DRV_NAME "piix"
  57
  58 static int no_piix_dma;
  59
  60 /**
  61  *      piix_set_pio_mode       -       set host controller for PIO mode
  62  *      @drive: drive
  63  *      @pio: PIO mode number
  64  *
  65  *      Set the interface PIO mode based upon the settings done by AMI BIOS.
  66  */
  67
  68 static void piix_set_pio_mode(ide_drive_t *drive, const u8 pio)
  69 {
  70         ide_hwif_t *hwif        = HWIF(drive);
  71         struct pci_dev *dev     = to_pci_dev(hwif->dev);
  72         int is_slave            = drive->dn & 1;
  73         int master_port         = hwif->channel ? 0x42 : 0x40;
  74         int slave_port          = 0x44;
  75         unsigned long flags;
  76         u16 master_data;
  77         u8 slave_data;
  78         static DEFINE_SPINLOCK(tune_lock);
  79         int control = 0;
  80
  81                                      /* ISP  RTC */
  82         static const u8 timings[][2]= {
  83                                         { 0, 0 },
  84                                         { 0, 0 },
  85                                         { 1, 0 },
  86                                         { 2, 1 },
  87                                         { 2, 3 }, };
  88
  89         /*
  90          * Master vs slave is synchronized above us but the slave register is
  91          * shared by the two hwifs so the corner case of two slave timeouts in
  92          * parallel must be locked.
  93          */
  94         spin_lock_irqsave(&tune_lock, flags);
  95         pci_read_config_word(dev, master_port, &master_data);
  96
  97         if (pio > 1)
  98                 control |= 1;   /* Programmable timing on */
  99         if (drive->media == ide_disk)
 100                 control |= 4;   /* Prefetch, post write */
 101         if (pio > 2)
 102                 control |= 2;   /* IORDY */
 103         if (is_slave) {
 104                 master_data |=  0x4000;
 105                 master_data &= ~0x0070;
 106                 if (pio > 1) {
 107                         /* Set PPE, IE and TIME */
 108                         master_data |= control << 4;
 109                 }
 110                 pci_read_config_byte(dev, slave_port, &slave_data);
 111                 slave_data &= hwif->channel ? 0x0f : 0xf0;
 112                 slave_data |= ((timings[pio][0] << 2) | timings[pio][1]) <<
 113                                (hwif->channel ? 4 : 0);
 114         } else {
 115                 master_data &= ~0x3307;
 116                 if (pio > 1) {
 117                         /* enable PPE, IE and TIME */
 118                         master_data |= control;
 119                 }
 120                 master_data |= (timings[pio][0] << 12) | (timings[pio][1] << 8);
 121         }
 122         pci_write_config_word(dev, master_port, master_data);
 123         if (is_slave)
 124                 pci_write_config_byte(dev, slave_port, slave_data);
 125         spin_unlock_irqrestore(&tune_lock, flags);
 126 }
 127
 128 /**
 129  *      piix_set_dma_mode       -       set host controller for DMA mode
 130  *      @drive: drive
 131  *      @speed: DMA mode
 132  *
 133  *      Set a PIIX host controller to the desired DMA mode.  This involves
 134  *      programming the right timing data into the PCI configuration space.
 135  */
 136
 137 static void piix_set_dma_mode(ide_drive_t *drive, const u8 speed)
 138 {
 139         ide_hwif_t *hwif        = HWIF(drive);
 140         struct pci_dev *dev     = to_pci_dev(hwif->dev);
 141         u8 maslave              = hwif->channel ? 0x42 : 0x40;
 142         int a_speed             = 3 << (drive->dn * 4);
 143         int u_flag              = 1 << drive->dn;
 144         int v_flag              = 0x01 << drive->dn;
 145         int w_flag              = 0x10 << drive->dn;
 146         int u_speed             = 0;
 147         int                     sitre;
 148         u16                     reg4042, reg4a;
 149         u8                      reg48, reg54, reg55;
 150
 151         pci_read_config_word(dev, maslave, &reg4042);
 152         sitre = (reg4042 & 0x4000) ? 1 : 0;
 153         pci_read_config_byte(dev, 0x48, &reg48);
 154         pci_read_config_word(dev, 0x4a, &reg4a);
 155         pci_read_config_byte(dev, 0x54, &reg54);
 156         pci_read_config_byte(dev, 0x55, &reg55);
 157
 158         if (speed >= XFER_UDMA_0) {
 159                 u8 udma = speed - XFER_UDMA_0;
 160
 161                 u_speed = min_t(u8, 2 - (udma & 1), udma) << (drive->dn * 4);
 162
 163                 if (!(reg48 & u_flag))
 164                         pci_write_config_byte(dev, 0x48, reg48 | u_flag);
 165                 if (speed == XFER_UDMA_5) {
 166                         pci_write_config_byte(dev, 0x55, (u8) reg55|w_flag);
 167                 } else {
 168                         pci_write_config_byte(dev, 0x55, (u8) reg55 & ~w_flag);
 169                 }
 170                 if ((reg4a & a_speed) != u_speed)
 171                         pci_write_config_word(dev, 0x4a, (reg4a & ~a_speed) | u_speed);
 172                 if (speed > XFER_UDMA_2) {
 173                         if (!(reg54 & v_flag))
 174                                 pci_write_config_byte(dev, 0x54, reg54 | v_flag);
 175                 } else
 176                         pci_write_config_byte(dev, 0x54, reg54 & ~v_flag);
 177         } else {
 178                 const u8 mwdma_to_pio[] = { 0, 3, 4 };
 179                 u8 pio;
 180
 181                 if (reg48 & u_flag)
 182                         pci_write_config_byte(dev, 0x48, reg48 & ~u_flag);
 183                 if (reg4a & a_speed)
 184                         pci_write_config_word(dev, 0x4a, reg4a & ~a_speed);
 185                 if (reg54 & v_flag)
 186                         pci_write_config_byte(dev, 0x54, reg54 & ~v_flag);
 187                 if (reg55 & w_flag)
 188                         pci_write_config_byte(dev, 0x55, (u8) reg55 & ~w_flag);
 189
 190                 if (speed >= XFER_MW_DMA_0)
 191                         pio = mwdma_to_pio[speed - XFER_MW_DMA_0];
 192                 else
 193                         pio = 2; /* only SWDMA2 is allowed */
 194
 195                 piix_set_pio_mode(drive, pio);
 196         }
 197 }
 198
 199 /**
 200  *      init_chipset_ich        -       set up the ICH chipset
 201  *      @dev: PCI device to set up
 202  *
 203  *      Initialize the PCI device as required.  For the ICH this turns
 204  *      out to be nice and simple.
 205  */
 206
 207 static unsigned int __devinit init_chipset_ich(struct pci_dev *dev)
 208 {
 209         u32 extra = 0;
 210
 211         pci_read_config_dword(dev, 0x54, &extra);
 212         pci_write_config_dword(dev, 0x54, extra | 0x400);
 213
 214         return 0;
 215 }
 216
 217 /**
 218  *      piix_dma_clear_irq      -       clear BMDMA status
 219  *      @drive: IDE drive to clear
 220  *
 221  *      Called from ide_intr() for PIO interrupts
 222  *      to clear BMDMA status as needed by ICHx
 223  */
 224 static void piix_dma_clear_irq(ide_drive_t *drive)
 225 {
 226         ide_hwif_t *hwif = HWIF(drive);
 227         u8 dma_stat;
 228
 229         /* clear the INTR & ERROR bits */
 230         dma_stat = inb(hwif->dma_base + ATA_DMA_STATUS);
 231         /* Should we force the bit as well ? */
 232         outb(dma_stat, hwif->dma_base + ATA_DMA_STATUS);
 233 }
 234
 235 struct ich_laptop {
 236         u16 device;
 237         u16 subvendor;
 238         u16 subdevice;
 239 };
 240
 241 /*
 242  *      List of laptops that use short cables rather than 80 wire
 243  */
 244
 245 static const struct ich_laptop ich_laptop[] = {
 246         /* devid, subvendor, subdev */
 247         { 0x27DF, 0x1025, 0x0102 },     /* ICH7 on Acer 5602aWLMi */
 248         { 0x27DF, 0x0005, 0x0280 },     /* ICH7 on Acer 5602WLMi */
 249         { 0x27DF, 0x1025, 0x0110 },     /* ICH7 on Acer 3682WLMi */
 250         { 0x27DF, 0x1043, 0x1267 },     /* ICH7 on Asus W5F */
 251         { 0x27DF, 0x103C, 0x30A1 },     /* ICH7 on HP Compaq nc2400 */
 252         { 0x24CA, 0x1025, 0x0061 },     /* ICH4 on Acer Aspire 2023WLMi */
 253         { 0x2653, 0x1043, 0x82D8 },     /* ICH6M on Asus Eee 701 */
 254         /* end marker */
 255         { 0, }
 256 };
 257
 258 static u8 piix_cable_detect(ide_hwif_t *hwif)
 259 {
 260         struct pci_dev *pdev = to_pci_dev(hwif->dev);
 261         const struct ich_laptop *lap = &ich_laptop[0];
 262         u8 reg54h = 0, mask = hwif->channel ? 0xc0 : 0x30;
 263
 264         /* check for specials */
 265         while (lap->device) {
 266                 if (lap->device == pdev->device &&
 267                     lap->subvendor == pdev->subsystem_vendor &&
 268                     lap->subdevice == pdev->subsystem_device) {
 269                         return ATA_CBL_PATA40_SHORT;
 270                 }
 271                 lap++;
 272         }
 273
 274         pci_read_config_byte(pdev, 0x54, &reg54h);
 275
 276         return (reg54h & mask) ? ATA_CBL_PATA80 : ATA_CBL_PATA40;
 277 }
 278
 279 /**
 280  *      init_hwif_piix          -       fill in the hwif for the PIIX
 281  *      @hwif: IDE interface
 282  *
 283  *      Set up the ide_hwif_t for the PIIX interface according to the
 284  *      capabilities of the hardware.
 285  */
 286
 287 static void __devinit init_hwif_piix(ide_hwif_t *hwif)
 288 {
 289         if (!hwif->dma_base)
 290                 return;
 291
 292         if (no_piix_dma)
 293                 hwif->ultra_mask = hwif->mwdma_mask = hwif->swdma_mask = 0;
 294 }
 295
 296 static void __devinit init_hwif_ich(ide_hwif_t *hwif)
 297 {
 298         init_hwif_piix(hwif);
 299
 300         /* ICHx need to clear the BMDMA status for all interrupts */
 301         if (hwif->dma_base)
 302                 hwif->ide_dma_clear_irq = &piix_dma_clear_irq;
 303 }
 304
 305 static const struct ide_port_ops piix_port_ops = {
 306         .set_pio_mode           = piix_set_pio_mode,
 307         .set_dma_mode           = piix_set_dma_mode,
 308         .cable_detect           = piix_cable_detect,
 309 };
 310
 311 #ifndef CONFIG_IA64
 312  #define IDE_HFLAGS_PIIX IDE_HFLAG_LEGACY_IRQS
 313 #else
 314  #define IDE_HFLAGS_PIIX 0
 315 #endif
 316
 317 #define DECLARE_PIIX_DEV(udma) \
 318         {                                               \
 319                 .name           = DRV_NAME,             \
 320                 .init_hwif      = init_hwif_piix,       \
 321                 .enablebits     = {{0x41,0x80,0x80}, {0x43,0x80,0x80}}, \
 322                 .port_ops       = &piix_port_ops,       \
 323                 .host_flags     = IDE_HFLAGS_PIIX,      \
 324                 .pio_mask       = ATA_PIO4,             \
 325                 .swdma_mask     = ATA_SWDMA2_ONLY,      \
 326                 .mwdma_mask     = ATA_MWDMA12_ONLY,     \
 327                 .udma_mask      = udma,                 \
 328         }
 329
 330 #define DECLARE_ICH_DEV(udma) \
 331         { \
 332                 .name           = DRV_NAME, \
 333                 .init_chipset   = init_chipset_ich, \
 334                 .init_hwif      = init_hwif_ich, \
 335                 .enablebits     = {{0x41,0x80,0x80}, {0x43,0x80,0x80}}, \
 336                 .port_ops       = &piix_port_ops, \
 337                 .host_flags     = IDE_HFLAGS_PIIX, \
 338                 .pio_mask       = ATA_PIO4, \
 339                 .swdma_mask     = ATA_SWDMA2_ONLY, \
 340                 .mwdma_mask     = ATA_MWDMA12_ONLY, \
 341                 .udma_mask      = udma, \
 342         }
 343
 344 static const struct ide_port_info piix_pci_info[] __devinitdata = {
 345         /* 0: MPIIX */
 346         {       /*
 347                  * MPIIX actually has only a single IDE channel mapped to
 348                  * the primary or secondary ports depending on the value
 349                  * of the bit 14 of the IDETIM register at offset 0x6c
 350                  */
 351                 .name           = DRV_NAME,
 352                 .enablebits     = {{0x6d,0xc0,0x80}, {0x6d,0xc0,0xc0}},
 353                 .host_flags     = IDE_HFLAG_ISA_PORTS | IDE_HFLAG_NO_DMA |
 354                                   IDE_HFLAGS_PIIX,
 355                 .pio_mask       = ATA_PIO4,
 356                 /* This is a painful system best to let it self tune for now */
 357         },
 358         /* 1: PIIXa/PIIXb/PIIX3 */
 359         DECLARE_PIIX_DEV(0x00), /* no udma */
 360         /* 2: PIIX4 */
 361         DECLARE_PIIX_DEV(ATA_UDMA2),
 362         /* 3: ICH0 */
 363         DECLARE_ICH_DEV(ATA_UDMA2),
 364         /* 4: ICH */
 365         DECLARE_ICH_DEV(ATA_UDMA4),
 366         /* 5: PIIX4 */
 367         DECLARE_PIIX_DEV(ATA_UDMA4),
 368         /* 6: ICH[2-7]/ICH[2-3]M/C-ICH/ICH5-SATA/ESB2/ICH8M */
 369         DECLARE_ICH_DEV(ATA_UDMA5),
 370 };
 371
 372 /**
 373  *      piix_init_one   -       called when a PIIX is found
 374  *      @dev: the piix device
 375  *      @id: the matching pci id
 376  *
 377  *      Called when the PCI registration layer (or the IDE initialization)
 378  *      finds a device matching our IDE device tables.
 379  */
 380
 381 static int __devinit piix_init_one(struct pci_dev *dev, const struct pci_device_id *id)
 382 {
 383         return ide_pci_init_one(dev, &piix_pci_info[id->driver_data], NULL);
 384 }
 385
 386 /**
 387  *      piix_check_450nx        -       Check for problem 450NX setup
 388  *
 389  *      Check for the present of 450NX errata #19 and errata #25. If
 390  *      they are found, disable use of DMA IDE
 391  */
 392
 393 static void __devinit piix_check_450nx(void)
 394 {
 395         struct pci_dev *pdev = NULL;
 396         u16 cfg;
 397         while((pdev=pci_get_device(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_82454NX, pdev))!=NULL)
 398         {
 399                 /* Look for 450NX PXB. Check for problem configurations
 400                    A PCI quirk checks bit 6 already */
 401                 pci_read_config_word(pdev, 0x41, &cfg);
 402                 /* Only on the original revision: IDE DMA can hang */
 403                 if (pdev->revision == 0x00)
 404                         no_piix_dma = 1;
 405                 /* On all revisions below 5 PXB bus lock must be disabled for IDE */
 406                 else if (cfg & (1<<14) && pdev->revision < 5)
 407                         no_piix_dma = 2;
 408         }
 409         if(no_piix_dma)
 410                 printk(KERN_WARNING DRV_NAME ": 450NX errata present, disabling IDE DMA.\n");
 411         if(no_piix_dma == 2)
 412                 printk(KERN_WARNING DRV_NAME ": A BIOS update may resolve this.\n");
 413 }
 414
 415 static const struct pci_device_id piix_pci_tbl[] = {
 416         { PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_82371FB_0),  1 },
 417         { PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_82371FB_1),  1 },
 418         { PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_82371MX),    0 },
 419         { PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_82371SB_1),  1 },
 420         { PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_82371AB),    2 },
 421         { PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_82801AB_1),  3 },
 422         { PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_82443MX_1),  2 },
 423         { PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_82801AA_1),  4 },
 424         { PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_82372FB_1),  5 },
 425         { PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_82451NX),    2 },
 426         { PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_82801BA_9),  6 },
 427         { PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_82801BA_8),  6 },
 428         { PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_82801CA_10), 6 },
 429         { PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_82801CA_11), 6 },
 430         { PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_82801DB_11), 6 },
 431         { PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_82801EB_11), 6 },
 432         { PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_82801E_11),  6 },
 433         { PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_82801DB_10), 6 },
 434 #ifdef CONFIG_BLK_DEV_IDE_SATA
 435         { PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_82801EB_1),  6 },
 436 #endif
 437         { PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_ESB_2),      6 },
 438         { PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_ICH6_19),    6 },
 439         { PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_ICH7_21),    6 },
 440         { PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_82801DB_1),  6 },
 441         { PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_ESB2_18),    6 },
 442         { PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_ICH8_6),     6 },
 443         { 0, },
 444 };
 445 MODULE_DEVICE_TABLE(pci, piix_pci_tbl);
 446
 447 static struct pci_driver driver = {
 448         .name           = "PIIX_IDE",
 449         .id_table       = piix_pci_tbl,
 450         .probe          = piix_init_one,
 451         .remove         = ide_pci_remove,
 452 };
 453
 454 static int __init piix_ide_init(void)
 455 {
 456         piix_check_450nx();
 457         return ide_pci_register_driver(&driver);
 458 }
 459
 460 static void __exit piix_ide_exit(void)
 461 {
 462         pci_unregister_driver(&driver);
 463 }
 464
 465 module_init(piix_ide_init);
 466 module_exit(piix_ide_exit);
 467
 468 MODULE_AUTHOR("Andre Hedrick, Andrzej Krzysztofowicz");
 469 MODULE_DESCRIPTION("PCI driver module for Intel PIIX IDE");
 470 MODULE_LICENSE("GPL");