drivers/ide/pci/via82cxxx.c

   1 /*
   2  * VIA IDE driver for Linux. Supported southbridges:
   3  *
   4  *   vt82c576, vt82c586, vt82c586a, vt82c586b, vt82c596a, vt82c596b,
   5  *   vt82c686, vt82c686a, vt82c686b, vt8231, vt8233, vt8233c, vt8233a,
   6  *   vt8235, vt8237, vt8237a
   7  *
   8  * Copyright (c) 2000-2002 Vojtech Pavlik
   9  * Copyright (c) 2007 Bartlomiej Zolnierkiewicz
  10  *
  11  * Based on the work of:
  12  *      Michel Aubry
  13  *      Jeff Garzik
  14  *      Andre Hedrick
  15  *
  16  * Documentation:
  17  *      Obsolete device documentation publically available from via.com.tw
  18  *      Current device documentation available under NDA only
  19  */
  20
  21 /*
  22  * This program is free software; you can redistribute it and/or modify it
  23  * under the terms of the GNU General Public License version 2 as published by
  24  * the Free Software Foundation.
  25  */
  26
  27 #include <linux/module.h>
  28 #include <linux/kernel.h>
  29 #include <linux/ioport.h>
  30 #include <linux/blkdev.h>
  31 #include <linux/pci.h>
  32 #include <linux/init.h>
  33 #include <linux/ide.h>
  34 #include <linux/dmi.h>
  35
  36 #include <asm/io.h>
  37
  38 #ifdef CONFIG_PPC_CHRP
  39 #include <asm/processor.h>
  40 #endif
  41
  42 #include "ide-timing.h"
  43
  44 #define VIA_IDE_ENABLE          0x40
  45 #define VIA_IDE_CONFIG          0x41
  46 #define VIA_FIFO_CONFIG         0x43
  47 #define VIA_MISC_1              0x44
  48 #define VIA_MISC_2              0x45
  49 #define VIA_MISC_3              0x46
  50 #define VIA_DRIVE_TIMING        0x48
  51 #define VIA_8BIT_TIMING         0x4e
  52 #define VIA_ADDRESS_SETUP       0x4c
  53 #define VIA_UDMA_TIMING         0x50
  54
  55 #define VIA_BAD_PREQ            0x01 /* Crashes if PREQ# till DDACK# set */
  56 #define VIA_BAD_CLK66           0x02 /* 66 MHz clock doesn't work correctly */
  57 #define VIA_SET_FIFO            0x04 /* Needs to have FIFO split set */
  58 #define VIA_NO_UNMASK           0x08 /* Doesn't work with IRQ unmasking on */
  59 #define VIA_BAD_ID              0x10 /* Has wrong vendor ID (0x1107) */
  60 #define VIA_BAD_AST             0x20 /* Don't touch Address Setup Timing */
  61
  62 /*
  63  * VIA SouthBridge chips.
  64  */
  65
  66 static struct via_isa_bridge {
  67         char *name;
  68         u16 id;
  69         u8 rev_min;
  70         u8 rev_max;
  71         u8 udma_mask;
  72         u8 flags;
  73 } via_isa_bridges[] = {
  74         { "vx800",      PCI_DEVICE_ID_VIA_VX800,    0x00, 0x2f, ATA_UDMA6, VIA_BAD_AST },
  75         { "cx700",      PCI_DEVICE_ID_VIA_CX700,    0x00, 0x2f, ATA_UDMA6, VIA_BAD_AST },
  76         { "vt8237s",    PCI_DEVICE_ID_VIA_8237S,    0x00, 0x2f, ATA_UDMA6, VIA_BAD_AST },
  77         { "vt6410",     PCI_DEVICE_ID_VIA_6410,     0x00, 0x2f, ATA_UDMA6, VIA_BAD_AST },
  78         { "vt8251",     PCI_DEVICE_ID_VIA_8251,     0x00, 0x2f, ATA_UDMA6, VIA_BAD_AST },
  79         { "vt8237",     PCI_DEVICE_ID_VIA_8237,     0x00, 0x2f, ATA_UDMA6, VIA_BAD_AST },
  80         { "vt8237a",    PCI_DEVICE_ID_VIA_8237A,    0x00, 0x2f, ATA_UDMA6, VIA_BAD_AST },
  81         { "vt8235",     PCI_DEVICE_ID_VIA_8235,     0x00, 0x2f, ATA_UDMA6, VIA_BAD_AST },
  82         { "vt8233a",    PCI_DEVICE_ID_VIA_8233A,    0x00, 0x2f, ATA_UDMA6, VIA_BAD_AST },
  83         { "vt8233c",    PCI_DEVICE_ID_VIA_8233C_0,  0x00, 0x2f, ATA_UDMA5, },
  84         { "vt8233",     PCI_DEVICE_ID_VIA_8233_0,   0x00, 0x2f, ATA_UDMA5, },
  85         { "vt8231",     PCI_DEVICE_ID_VIA_8231,     0x00, 0x2f, ATA_UDMA5, },
  86         { "vt82c686b",  PCI_DEVICE_ID_VIA_82C686,   0x40, 0x4f, ATA_UDMA5, },
  87         { "vt82c686a",  PCI_DEVICE_ID_VIA_82C686,   0x10, 0x2f, ATA_UDMA4, },
  88         { "vt82c686",   PCI_DEVICE_ID_VIA_82C686,   0x00, 0x0f, ATA_UDMA2, VIA_BAD_CLK66 },
  89         { "vt82c596b",  PCI_DEVICE_ID_VIA_82C596,   0x10, 0x2f, ATA_UDMA4, },
  90         { "vt82c596a",  PCI_DEVICE_ID_VIA_82C596,   0x00, 0x0f, ATA_UDMA2, VIA_BAD_CLK66 },
  91         { "vt82c586b",  PCI_DEVICE_ID_VIA_82C586_0, 0x47, 0x4f, ATA_UDMA2, VIA_SET_FIFO },
  92         { "vt82c586b",  PCI_DEVICE_ID_VIA_82C586_0, 0x40, 0x46, ATA_UDMA2, VIA_SET_FIFO | VIA_BAD_PREQ },
  93         { "vt82c586b",  PCI_DEVICE_ID_VIA_82C586_0, 0x30, 0x3f, ATA_UDMA2, VIA_SET_FIFO },
  94         { "vt82c586a",  PCI_DEVICE_ID_VIA_82C586_0, 0x20, 0x2f, ATA_UDMA2, VIA_SET_FIFO },
  95         { "vt82c586",   PCI_DEVICE_ID_VIA_82C586_0, 0x00, 0x0f,      0x00, VIA_SET_FIFO },
  96         { "vt82c576",   PCI_DEVICE_ID_VIA_82C576,   0x00, 0x2f,      0x00, VIA_SET_FIFO | VIA_NO_UNMASK },
  97         { "vt82c576",   PCI_DEVICE_ID_VIA_82C576,   0x00, 0x2f,      0x00, VIA_SET_FIFO | VIA_NO_UNMASK | VIA_BAD_ID },
  98         { NULL }
  99 };
 100
 101 static unsigned int via_clock;
 102 static char *via_dma[] = { "16", "25", "33", "44", "66", "100", "133" };
 103
 104 struct via82cxxx_dev
 105 {
 106         struct via_isa_bridge *via_config;
 107         unsigned int via_80w;
 108 };
 109
 110 /**
 111  *      via_set_speed                   -       write timing registers
 112  *      @dev: PCI device
 113  *      @dn: device
 114  *      @timing: IDE timing data to use
 115  *
 116  *      via_set_speed writes timing values to the chipset registers
 117  */
 118
 119 static void via_set_speed(ide_hwif_t *hwif, u8 dn, struct ide_timing *timing)
 120 {
 121         struct pci_dev *dev = to_pci_dev(hwif->dev);
 122         struct via82cxxx_dev *vdev = pci_get_drvdata(dev);
 123         u8 t;
 124
 125         if (~vdev->via_config->flags & VIA_BAD_AST) {
 126                 pci_read_config_byte(dev, VIA_ADDRESS_SETUP, &t);
 127                 t = (t & ~(3 << ((3 - dn) << 1))) | ((FIT(timing->setup, 1, 4) - 1) << ((3 - dn) << 1));
 128                 pci_write_config_byte(dev, VIA_ADDRESS_SETUP, t);
 129         }
 130
 131         pci_write_config_byte(dev, VIA_8BIT_TIMING + (1 - (dn >> 1)),
 132                 ((FIT(timing->act8b, 1, 16) - 1) << 4) | (FIT(timing->rec8b, 1, 16) - 1));
 133
 134         pci_write_config_byte(dev, VIA_DRIVE_TIMING + (3 - dn),
 135                 ((FIT(timing->active, 1, 16) - 1) << 4) | (FIT(timing->recover, 1, 16) - 1));
 136
 137         switch (vdev->via_config->udma_mask) {
 138         case ATA_UDMA2: t = timing->udma ? (0xe0 | (FIT(timing->udma, 2, 5) - 2)) : 0x03; break;
 139         case ATA_UDMA4: t = timing->udma ? (0xe8 | (FIT(timing->udma, 2, 9) - 2)) : 0x0f; break;
 140         case ATA_UDMA5: t = timing->udma ? (0xe0 | (FIT(timing->udma, 2, 9) - 2)) : 0x07; break;
 141         case ATA_UDMA6: t = timing->udma ? (0xe0 | (FIT(timing->udma, 2, 9) - 2)) : 0x07; break;
 142         default: return;
 143         }
 144
 145         pci_write_config_byte(dev, VIA_UDMA_TIMING + (3 - dn), t);
 146 }
 147
 148 /**
 149  *      via_set_drive           -       configure transfer mode
 150  *      @drive: Drive to set up
 151  *      @speed: desired speed
 152  *
 153  *      via_set_drive() computes timing values configures the chipset to
 154  *      a desired transfer mode.  It also can be called by upper layers.
 155  */
 156
 157 static void via_set_drive(ide_drive_t *drive, const u8 speed)
 158 {
 159         ide_hwif_t *hwif = drive->hwif;
 160         ide_drive_t *peer = hwif->drives + (~drive->dn & 1);
 161         struct pci_dev *dev = to_pci_dev(hwif->dev);
 162         struct via82cxxx_dev *vdev = pci_get_drvdata(dev);
 163         struct ide_timing t, p;
 164         unsigned int T, UT;
 165
 166         T = 1000000000 / via_clock;
 167
 168         switch (vdev->via_config->udma_mask) {
 169         case ATA_UDMA2: UT = T;   break;
 170         case ATA_UDMA4: UT = T/2; break;
 171         case ATA_UDMA5: UT = T/3; break;
 172         case ATA_UDMA6: UT = T/4; break;
 173         default:        UT = T;
 174         }
 175
 176         ide_timing_compute(drive, speed, &t, T, UT);
 177
 178         if (peer->present) {
 179                 ide_timing_compute(peer, peer->current_speed, &p, T, UT);
 180                 ide_timing_merge(&p, &t, &t, IDE_TIMING_8BIT);
 181         }
 182
 183         via_set_speed(HWIF(drive), drive->dn, &t);
 184 }
 185
 186 /**
 187  *      via_set_pio_mode        -       set host controller for PIO mode
 188  *      @drive: drive
 189  *      @pio: PIO mode number
 190  *
 191  *      A callback from the upper layers for PIO-only tuning.
 192  */
 193
 194 static void via_set_pio_mode(ide_drive_t *drive, const u8 pio)
 195 {
 196         via_set_drive(drive, XFER_PIO_0 + pio);
 197 }
 198
 199 static struct via_isa_bridge *via_config_find(struct pci_dev **isa)
 200 {
 201         struct via_isa_bridge *via_config;
 202
 203         for (via_config = via_isa_bridges; via_config->id; via_config++)
 204                 if ((*isa = pci_get_device(PCI_VENDOR_ID_VIA +
 205                         !!(via_config->flags & VIA_BAD_ID),
 206                         via_config->id, NULL))) {
 207
 208                         if ((*isa)->revision >= via_config->rev_min &&
 209                             (*isa)->revision <= via_config->rev_max)
 210                                 break;
 211                         pci_dev_put(*isa);
 212                 }
 213
 214         return via_config;
 215 }
 216
 217 /*
 218  * Check and handle 80-wire cable presence
 219  */
 220 static void __devinit via_cable_detect(struct via82cxxx_dev *vdev, u32 u)
 221 {
 222         int i;
 223
 224         switch (vdev->via_config->udma_mask) {
 225                 case ATA_UDMA4:
 226                         for (i = 24; i >= 0; i -= 8)
 227                                 if (((u >> (i & 16)) & 8) &&
 228                                     ((u >> i) & 0x20) &&
 229                                      (((u >> i) & 7) < 2)) {
 230                                         /*
 231                                          * 2x PCI clock and
 232                                          * UDMA w/ < 3T/cycle
 233                                          */
 234                                         vdev->via_80w |= (1 << (1 - (i >> 4)));
 235                                 }
 236                         break;
 237
 238                 case ATA_UDMA5:
 239                         for (i = 24; i >= 0; i -= 8)
 240                                 if (((u >> i) & 0x10) ||
 241                                     (((u >> i) & 0x20) &&
 242                                      (((u >> i) & 7) < 4))) {
 243                                         /* BIOS 80-wire bit or
 244                                          * UDMA w/ < 60ns/cycle
 245                                          */
 246                                         vdev->via_80w |= (1 << (1 - (i >> 4)));
 247                                 }
 248                         break;
 249
 250                 case ATA_UDMA6:
 251                         for (i = 24; i >= 0; i -= 8)
 252                                 if (((u >> i) & 0x10) ||
 253                                     (((u >> i) & 0x20) &&
 254                                      (((u >> i) & 7) < 6))) {
 255                                         /* BIOS 80-wire bit or
 256                                          * UDMA w/ < 60ns/cycle
 257                                          */
 258                                         vdev->via_80w |= (1 << (1 - (i >> 4)));
 259                                 }
 260                         break;
 261         }
 262 }
 263
 264 /**
 265  *      init_chipset_via82cxxx  -       initialization handler
 266  *      @dev: PCI device
 267  *      @name: Name of interface
 268  *
 269  *      The initialization callback. Here we determine the IDE chip type
 270  *      and initialize its drive independent registers.
 271  */
 272
 273 static unsigned int __devinit init_chipset_via82cxxx(struct pci_dev *dev, const char *name)
 274 {
 275         struct pci_dev *isa = NULL;
 276         struct via82cxxx_dev *vdev;
 277         struct via_isa_bridge *via_config;
 278         u8 t, v;
 279         u32 u;
 280
 281         vdev = kzalloc(sizeof(*vdev), GFP_KERNEL);
 282         if (!vdev) {
 283                 printk(KERN_ERR "VP_IDE: out of memory :(\n");
 284                 return -ENOMEM;
 285         }
 286         pci_set_drvdata(dev, vdev);
 287
 288         /*
 289          * Find the ISA bridge to see how good the IDE is.
 290          */
 291         vdev->via_config = via_config = via_config_find(&isa);
 292
 293         /* We checked this earlier so if it fails here deeep badness
 294            is involved */
 295
 296         BUG_ON(!via_config->id);
 297
 298         /*
 299          * Detect cable and configure Clk66
 300          */
 301         pci_read_config_dword(dev, VIA_UDMA_TIMING, &u);
 302
 303         via_cable_detect(vdev, u);
 304
 305         if (via_config->udma_mask == ATA_UDMA4) {
 306                 /* Enable Clk66 */
 307                 pci_write_config_dword(dev, VIA_UDMA_TIMING, u|0x80008);
 308         } else if (via_config->flags & VIA_BAD_CLK66) {
 309                 /* Would cause trouble on 596a and 686 */
 310                 pci_write_config_dword(dev, VIA_UDMA_TIMING, u & ~0x80008);
 311         }
 312
 313         /*
 314          * Check whether interfaces are enabled.
 315          */
 316
 317         pci_read_config_byte(dev, VIA_IDE_ENABLE, &v);
 318
 319         /*
 320          * Set up FIFO sizes and thresholds.
 321          */
 322
 323         pci_read_config_byte(dev, VIA_FIFO_CONFIG, &t);
 324
 325         /* Disable PREQ# till DDACK# */
 326         if (via_config->flags & VIA_BAD_PREQ) {
 327                 /* Would crash on 586b rev 41 */
 328                 t &= 0x7f;
 329         }
 330
 331         /* Fix FIFO split between channels */
 332         if (via_config->flags & VIA_SET_FIFO) {
 333                 t &= (t & 0x9f);
 334                 switch (v & 3) {
 335                         case 2: t |= 0x00; break;       /* 16 on primary */
 336                         case 1: t |= 0x60; break;       /* 16 on secondary */
 337                         case 3: t |= 0x20; break;       /* 8 pri 8 sec */
 338                 }
 339         }
 340
 341         pci_write_config_byte(dev, VIA_FIFO_CONFIG, t);
 342
 343         /*
 344          * Determine system bus clock.
 345          */
 346
 347         via_clock = system_bus_clock() * 1000;
 348
 349         switch (via_clock) {
 350                 case 33000: via_clock = 33333; break;
 351                 case 37000: via_clock = 37500; break;
 352                 case 41000: via_clock = 41666; break;
 353         }
 354
 355         if (via_clock < 20000 || via_clock > 50000) {
 356                 printk(KERN_WARNING "VP_IDE: User given PCI clock speed "
 357                         "impossible (%d), using 33 MHz instead.\n", via_clock);
 358                 printk(KERN_WARNING "VP_IDE: Use ide0=ata66 if you want "
 359                         "to assume 80-wire cable.\n");
 360                 via_clock = 33333;
 361         }
 362
 363         /*
 364          * Print the boot message.
 365          */
 366
 367         printk(KERN_INFO "VP_IDE: VIA %s (rev %02x) IDE %sDMA%s "
 368                 "controller on pci%s\n",
 369                 via_config->name, isa->revision,
 370                 via_config->udma_mask ? "U" : "MW",
 371                 via_dma[via_config->udma_mask ?
 372                         (fls(via_config->udma_mask) - 1) : 0],
 373                 pci_name(dev));
 374
 375         pci_dev_put(isa);
 376         return 0;
 377 }
 378
 379 /*
 380  *      Cable special cases
 381  */
 382
 383 static const struct dmi_system_id cable_dmi_table[] = {
 384         {
 385                 .ident = "Acer Ferrari 3400",
 386                 .matches = {
 387                         DMI_MATCH(DMI_BOARD_VENDOR, "Acer,Inc."),
 388                         DMI_MATCH(DMI_BOARD_NAME, "Ferrari 3400"),
 389                 },
 390         },
 391         { }
 392 };
 393
 394 static int via_cable_override(struct pci_dev *pdev)
 395 {
 396         /* Systems by DMI */
 397         if (dmi_check_system(cable_dmi_table))
 398                 return 1;
 399
 400         /* Arima W730-K8/Targa Visionary 811/... */
 401         if (pdev->subsystem_vendor == 0x161F &&
 402             pdev->subsystem_device == 0x2032)
 403                 return 1;
 404
 405         return 0;
 406 }
 407
 408 static u8 __devinit via82cxxx_cable_detect(ide_hwif_t *hwif)
 409 {
 410         struct pci_dev *pdev = to_pci_dev(hwif->dev);
 411         struct via82cxxx_dev *vdev = pci_get_drvdata(pdev);
 412
 413         if (via_cable_override(pdev))
 414                 return ATA_CBL_PATA40_SHORT;
 415
 416         if ((vdev->via_80w >> hwif->channel) & 1)
 417                 return ATA_CBL_PATA80;
 418         else
 419                 return ATA_CBL_PATA40;
 420 }
 421
 422 static void __devinit init_hwif_via82cxxx(ide_hwif_t *hwif)
 423 {
 424         hwif->set_pio_mode = &via_set_pio_mode;
 425         hwif->set_dma_mode = &via_set_drive;
 426
 427         if (!hwif->dma_base)
 428                 return;
 429
 430         if (hwif->cbl != ATA_CBL_PATA40_SHORT)
 431                 hwif->cbl = via82cxxx_cable_detect(hwif);
 432 }
 433
 434 static const struct ide_port_info via82cxxx_chipset __devinitdata = {
 435         .name           = "VP_IDE",
 436         .init_chipset   = init_chipset_via82cxxx,
 437         .init_hwif      = init_hwif_via82cxxx,
 438         .enablebits     = { { 0x40, 0x02, 0x02 }, { 0x40, 0x01, 0x01 } },
 439         .host_flags     = IDE_HFLAG_PIO_NO_BLACKLIST |
 440                           IDE_HFLAG_PIO_NO_DOWNGRADE |
 441                           IDE_HFLAG_ABUSE_SET_DMA_MODE |
 442                           IDE_HFLAG_POST_SET_MODE |
 443                           IDE_HFLAG_IO_32BIT |
 444                           IDE_HFLAG_BOOTABLE,
 445         .pio_mask       = ATA_PIO5,
 446         .swdma_mask     = ATA_SWDMA2,
 447         .mwdma_mask     = ATA_MWDMA2,
 448 };
 449
 450 static int __devinit via_init_one(struct pci_dev *dev, const struct pci_device_id *id)
 451 {
 452         struct pci_dev *isa = NULL;
 453         struct via_isa_bridge *via_config;
 454         u8 idx = id->driver_data;
 455         struct ide_port_info d;
 456
 457         d = via82cxxx_chipset;
 458
 459         /*
 460          * Find the ISA bridge and check we know what it is.
 461          */
 462         via_config = via_config_find(&isa);
 463         pci_dev_put(isa);
 464         if (!via_config->id) {
 465                 printk(KERN_WARNING "VP_IDE: Unknown VIA SouthBridge, disabling DMA.\n");
 466                 return -ENODEV;
 467         }
 468
 469         if (idx == 0)
 470                 d.host_flags |= IDE_HFLAG_NO_AUTODMA;
 471         else
 472                 d.enablebits[1].reg = d.enablebits[0].reg = 0;
 473
 474         if ((via_config->flags & VIA_NO_UNMASK) == 0)
 475                 d.host_flags |= IDE_HFLAG_UNMASK_IRQS;
 476
 477 #ifdef CONFIG_PPC_CHRP
 478         if (machine_is(chrp) && _chrp_type == _CHRP_Pegasos)
 479                 d.host_flags |= IDE_HFLAG_FORCE_LEGACY_IRQS;
 480 #endif
 481
 482         d.udma_mask = via_config->udma_mask;
 483
 484         return ide_setup_pci_device(dev, &d);
 485 }
 486
 487 static const struct pci_device_id via_pci_tbl[] = {
 488         { PCI_VDEVICE(VIA, PCI_DEVICE_ID_VIA_82C576_1),  0 },
 489         { PCI_VDEVICE(VIA, PCI_DEVICE_ID_VIA_82C586_1),  0 },
 490         { PCI_VDEVICE(VIA, PCI_DEVICE_ID_VIA_6410),      1 },
 491         { PCI_VDEVICE(VIA, PCI_DEVICE_ID_VIA_SATA_EIDE), 1 },
 492         { 0, },
 493 };
 494 MODULE_DEVICE_TABLE(pci, via_pci_tbl);
 495
 496 static struct pci_driver driver = {
 497         .name           = "VIA_IDE",
 498         .id_table       = via_pci_tbl,
 499         .probe          = via_init_one,
 500 };
 501
 502 static int __init via_ide_init(void)
 503 {
 504         return ide_pci_register_driver(&driver);
 505 }
 506
 507 module_init(via_ide_init);
 508
 509 MODULE_AUTHOR("Vojtech Pavlik, Michel Aubry, Jeff Garzik, Andre Hedrick");
 510 MODULE_DESCRIPTION("PCI driver module for VIA IDE");
 511 MODULE_LICENSE("GPL");