drivers/ide/cmd64x.c

   1 /*
   2  * cmd64x.c: Enable interrupts at initialization time on Ultra/PCI machines.
   3  *           Due to massive hardware bugs, UltraDMA is only supported
   4  *           on the 646U2 and not on the 646U.
   5  *
   6  * Copyright (C) 1998           Eddie C. Dost  (ecd@skynet.be)
   7  * Copyright (C) 1998           David S. Miller (davem@redhat.com)
   8  *
   9  * Copyright (C) 1999-2002      Andre Hedrick <andre@linux-ide.org>
  10  * Copyright (C) 2007-2010      Bartlomiej Zolnierkiewicz
  11  * Copyright (C) 2007,2009      MontaVista Software, Inc. <source@mvista.com>
  12  */
  13
  14 #include <linux/module.h>
  15 #include <linux/types.h>
  16 #include <linux/pci.h>
  17 #include <linux/ide.h>
  18 #include <linux/init.h>
  19
  20 #include <asm/io.h>
  21
  22 #define DRV_NAME "cmd64x"
  23
  24 /*
  25  * CMD64x specific registers definition.
  26  */
  27 #define CFR             0x50
  28 #define   CFR_INTR_CH0          0x04
  29
  30 #define CMDTIM          0x52
  31 #define ARTTIM0         0x53
  32 #define DRWTIM0         0x54
  33 #define ARTTIM1         0x55
  34 #define DRWTIM1         0x56
  35 #define ARTTIM23        0x57
  36 #define   ARTTIM23_DIS_RA2      0x04
  37 #define   ARTTIM23_DIS_RA3      0x08
  38 #define   ARTTIM23_INTR_CH1     0x10
  39 #define DRWTIM2         0x58
  40 #define BRST            0x59
  41 #define DRWTIM3         0x5b
  42
  43 #define BMIDECR0        0x70
  44 #define MRDMODE         0x71
  45 #define   MRDMODE_INTR_CH0      0x04
  46 #define   MRDMODE_INTR_CH1      0x08
  47 #define UDIDETCR0       0x73
  48 #define DTPR0           0x74
  49 #define BMIDECR1        0x78
  50 #define BMIDECSR        0x79
  51 #define UDIDETCR1       0x7B
  52 #define DTPR1           0x7C
  53
  54 static void cmd64x_program_timings(ide_drive_t *drive, u8 mode)
  55 {
  56         ide_hwif_t *hwif = drive->hwif;
  57         struct pci_dev *dev = to_pci_dev(drive->hwif->dev);
  58         int bus_speed = ide_pci_clk ? ide_pci_clk : 33;
  59         const unsigned long T = 1000000 / bus_speed;
  60         static const u8 recovery_values[] =
  61                 {15, 15, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 0};
  62         static const u8 setup_values[] = {0x40, 0x40, 0x40, 0x80, 0, 0xc0};
  63         static const u8 arttim_regs[4] = {ARTTIM0, ARTTIM1, ARTTIM23, ARTTIM23};
  64         static const u8 drwtim_regs[4] = {DRWTIM0, DRWTIM1, DRWTIM2, DRWTIM3};
  65         struct ide_timing t;
  66         u8 arttim = 0;
  67
  68         ide_timing_compute(drive, mode, &t, T, 0);
  69
  70         /*
  71          * In case we've got too long recovery phase, try to lengthen
  72          * the active phase
  73          */
  74         if (t.recover > 16) {
  75                 t.active += t.recover - 16;
  76                 t.recover = 16;
  77         }
  78         if (t.active > 16)              /* shouldn't actually happen... */
  79                 t.active = 16;
  80
  81         /*
  82          * Convert values to internal chipset representation
  83          */
  84         t.recover = recovery_values[t.recover];
  85         t.active &= 0x0f;
  86
  87         /* Program the active/recovery counts into the DRWTIM register */
  88         pci_write_config_byte(dev, drwtim_regs[drive->dn],
  89                               (t.active << 4) | t.recover);
  90
  91         /*
  92          * The primary channel has individual address setup timing registers
  93          * for each drive and the hardware selects the slowest timing itself.
  94          * The secondary channel has one common register and we have to select
  95          * the slowest address setup timing ourselves.
  96          */
  97         if (hwif->channel) {
  98                 ide_drive_t *pair = ide_get_pair_dev(drive);
  99
 100                 if (pair) {
 101                         struct ide_timing tp;
 102
 103                         ide_timing_compute(pair, pair->pio_mode, &tp, T, 0);
 104                         ide_timing_merge(&t, &tp, &t, IDE_TIMING_SETUP);
 105                         if (pair->dma_mode) {
 106                                 ide_timing_compute(pair, pair->dma_mode,
 107                                                 &tp, T, 0);
 108                                 ide_timing_merge(&tp, &t, &t, IDE_TIMING_SETUP);
 109                         }
 110                 }
 111         }
 112
 113         if (t.setup > 5)                /* shouldn't actually happen... */
 114                 t.setup = 5;
 115
 116         /*
 117          * Program the address setup clocks into the ARTTIM registers.
 118          * Avoid clearing the secondary channel's interrupt bit.
 119          */
 120         (void) pci_read_config_byte (dev, arttim_regs[drive->dn], &arttim);
 121         if (hwif->channel)
 122                 arttim &= ~ARTTIM23_INTR_CH1;
 123         arttim &= ~0xc0;
 124         arttim |= setup_values[t.setup];
 125         (void) pci_write_config_byte(dev, arttim_regs[drive->dn], arttim);
 126 }
 127
 128 /*
 129  * Attempts to set drive's PIO mode.
 130  * Special cases are 8: prefetch off, 9: prefetch on (both never worked)
 131  */
 132
 133 static void cmd64x_set_pio_mode(ide_hwif_t *hwif, ide_drive_t *drive)
 134 {
 135         const u8 pio = drive->pio_mode - XFER_PIO_0;
 136
 137         /*
 138          * Filter out the prefetch control values
 139          * to prevent PIO5 from being programmed
 140          */
 141         if (pio == 8 || pio == 9)
 142                 return;
 143
 144         cmd64x_program_timings(drive, XFER_PIO_0 + pio);
 145 }
 146
 147 static void cmd64x_set_dma_mode(ide_hwif_t *hwif, ide_drive_t *drive)
 148 {
 149         struct pci_dev *dev     = to_pci_dev(hwif->dev);
 150         u8 unit                 = drive->dn & 0x01;
 151         u8 regU = 0, pciU       = hwif->channel ? UDIDETCR1 : UDIDETCR0;
 152         const u8 speed          = drive->dma_mode;
 153
 154         pci_read_config_byte(dev, pciU, &regU);
 155         regU &= ~(unit ? 0xCA : 0x35);
 156
 157         switch(speed) {
 158         case XFER_UDMA_5:
 159                 regU |= unit ? 0x0A : 0x05;
 160                 break;
 161         case XFER_UDMA_4:
 162                 regU |= unit ? 0x4A : 0x15;
 163                 break;
 164         case XFER_UDMA_3:
 165                 regU |= unit ? 0x8A : 0x25;
 166                 break;
 167         case XFER_UDMA_2:
 168                 regU |= unit ? 0x42 : 0x11;
 169                 break;
 170         case XFER_UDMA_1:
 171                 regU |= unit ? 0x82 : 0x21;
 172                 break;
 173         case XFER_UDMA_0:
 174                 regU |= unit ? 0xC2 : 0x31;
 175                 break;
 176         case XFER_MW_DMA_2:
 177         case XFER_MW_DMA_1:
 178         case XFER_MW_DMA_0:
 179                 cmd64x_program_timings(drive, speed);
 180                 break;
 181         }
 182
 183         pci_write_config_byte(dev, pciU, regU);
 184 }
 185
 186 static void cmd648_clear_irq(ide_drive_t *drive)
 187 {
 188         ide_hwif_t *hwif        = drive->hwif;
 189         struct pci_dev *dev     = to_pci_dev(hwif->dev);
 190         unsigned long base      = pci_resource_start(dev, 4);
 191         u8  irq_mask            = hwif->channel ? MRDMODE_INTR_CH1 :
 192                                                   MRDMODE_INTR_CH0;
 193         u8  mrdmode             = inb(base + 1);
 194
 195         /* clear the interrupt bit */
 196         outb((mrdmode & ~(MRDMODE_INTR_CH0 | MRDMODE_INTR_CH1)) | irq_mask,
 197              base + 1);
 198 }
 199
 200 static void cmd64x_clear_irq(ide_drive_t *drive)
 201 {
 202         ide_hwif_t *hwif        = drive->hwif;
 203         struct pci_dev *dev     = to_pci_dev(hwif->dev);
 204         int irq_reg             = hwif->channel ? ARTTIM23 : CFR;
 205         u8  irq_mask            = hwif->channel ? ARTTIM23_INTR_CH1 :
 206                                                   CFR_INTR_CH0;
 207         u8  irq_stat            = 0;
 208
 209         (void) pci_read_config_byte(dev, irq_reg, &irq_stat);
 210         /* clear the interrupt bit */
 211         (void) pci_write_config_byte(dev, irq_reg, irq_stat | irq_mask);
 212 }
 213
 214 static int cmd648_test_irq(ide_hwif_t *hwif)
 215 {
 216         struct pci_dev *dev     = to_pci_dev(hwif->dev);
 217         unsigned long base      = pci_resource_start(dev, 4);
 218         u8 irq_mask             = hwif->channel ? MRDMODE_INTR_CH1 :
 219                                                   MRDMODE_INTR_CH0;
 220         u8 mrdmode              = inb(base + 1);
 221
 222         pr_debug("%s: mrdmode: 0x%02x irq_mask: 0x%02x\n",
 223                  hwif->name, mrdmode, irq_mask);
 224
 225         return (mrdmode & irq_mask) ? 1 : 0;
 226 }
 227
 228 static int cmd64x_test_irq(ide_hwif_t *hwif)
 229 {
 230         struct pci_dev *dev     = to_pci_dev(hwif->dev);
 231         int irq_reg             = hwif->channel ? ARTTIM23 : CFR;
 232         u8  irq_mask            = hwif->channel ? ARTTIM23_INTR_CH1 :
 233                                                   CFR_INTR_CH0;
 234         u8  irq_stat            = 0;
 235
 236         (void) pci_read_config_byte(dev, irq_reg, &irq_stat);
 237
 238         pr_debug("%s: irq_stat: 0x%02x irq_mask: 0x%02x\n",
 239                  hwif->name, irq_stat, irq_mask);
 240
 241         return (irq_stat & irq_mask) ? 1 : 0;
 242 }
 243
 244 /*
 245  * ASUS P55T2P4D with CMD646 chipset revision 0x01 requires the old
 246  * event order for DMA transfers.
 247  */
 248
 249 static int cmd646_1_dma_end(ide_drive_t *drive)
 250 {
 251         ide_hwif_t *hwif = drive->hwif;
 252         u8 dma_stat = 0, dma_cmd = 0;
 253
 254         /* get DMA status */
 255         dma_stat = inb(hwif->dma_base + ATA_DMA_STATUS);
 256         /* read DMA command state */
 257         dma_cmd = inb(hwif->dma_base + ATA_DMA_CMD);
 258         /* stop DMA */
 259         outb(dma_cmd & ~1, hwif->dma_base + ATA_DMA_CMD);
 260         /* clear the INTR & ERROR bits */
 261         outb(dma_stat | 6, hwif->dma_base + ATA_DMA_STATUS);
 262         /* verify good DMA status */
 263         return (dma_stat & 7) != 4;
 264 }
 265
 266 static int init_chipset_cmd64x(struct pci_dev *dev)
 267 {
 268         u8 mrdmode = 0;
 269
 270         /* Set a good latency timer and cache line size value. */
 271         (void) pci_write_config_byte(dev, PCI_LATENCY_TIMER, 64);
 272         /* FIXME: pci_set_master() to ensure a good latency timer value */
 273
 274         /*
 275          * Enable interrupts, select MEMORY READ LINE for reads.
 276          *
 277          * NOTE: although not mentioned in the PCI0646U specs,
 278          * bits 0-1 are write only and won't be read back as
 279          * set or not -- PCI0646U2 specs clarify this point.
 280          */
 281         (void) pci_read_config_byte (dev, MRDMODE, &mrdmode);
 282         mrdmode &= ~0x30;
 283         (void) pci_write_config_byte(dev, MRDMODE, (mrdmode | 0x02));
 284
 285         return 0;
 286 }
 287
 288 static u8 cmd64x_cable_detect(ide_hwif_t *hwif)
 289 {
 290         struct pci_dev  *dev    = to_pci_dev(hwif->dev);
 291         u8 bmidecsr = 0, mask   = hwif->channel ? 0x02 : 0x01;
 292
 293         switch (dev->device) {
 294         case PCI_DEVICE_ID_CMD_648:
 295         case PCI_DEVICE_ID_CMD_649:
 296                 pci_read_config_byte(dev, BMIDECSR, &bmidecsr);
 297                 return (bmidecsr & mask) ? ATA_CBL_PATA80 : ATA_CBL_PATA40;
 298         default:
 299                 return ATA_CBL_PATA40;
 300         }
 301 }
 302
 303 static const struct ide_port_ops cmd64x_port_ops = {
 304         .set_pio_mode           = cmd64x_set_pio_mode,
 305         .set_dma_mode           = cmd64x_set_dma_mode,
 306         .clear_irq              = cmd64x_clear_irq,
 307         .test_irq               = cmd64x_test_irq,
 308         .cable_detect           = cmd64x_cable_detect,
 309 };
 310
 311 static const struct ide_port_ops cmd648_port_ops = {
 312         .set_pio_mode           = cmd64x_set_pio_mode,
 313         .set_dma_mode           = cmd64x_set_dma_mode,
 314         .clear_irq              = cmd648_clear_irq,
 315         .test_irq               = cmd648_test_irq,
 316         .cable_detect           = cmd64x_cable_detect,
 317 };
 318
 319 static const struct ide_dma_ops cmd646_rev1_dma_ops = {
 320         .dma_host_set           = ide_dma_host_set,
 321         .dma_setup              = ide_dma_setup,
 322         .dma_start              = ide_dma_start,
 323         .dma_end                = cmd646_1_dma_end,
 324         .dma_test_irq           = ide_dma_test_irq,
 325         .dma_lost_irq           = ide_dma_lost_irq,
 326         .dma_timer_expiry       = ide_dma_sff_timer_expiry,
 327         .dma_sff_read_status    = ide_dma_sff_read_status,
 328 };
 329
 330 static const struct ide_port_info cmd64x_chipsets[] = {
 331         {       /* 0: CMD643 */
 332                 .name           = DRV_NAME,
 333                 .init_chipset   = init_chipset_cmd64x,
 334                 .enablebits     = {{0x00,0x00,0x00}, {0x51,0x08,0x08}},
 335                 .port_ops       = &cmd64x_port_ops,
 336                 .host_flags     = IDE_HFLAG_CLEAR_SIMPLEX |
 337                                   IDE_HFLAG_ABUSE_PREFETCH |
 338                                   IDE_HFLAG_SERIALIZE,
 339                 .pio_mask       = ATA_PIO5,
 340                 .mwdma_mask     = ATA_MWDMA2,
 341                 .udma_mask      = 0x00, /* no udma */
 342         },
 343         {       /* 1: CMD646 */
 344                 .name           = DRV_NAME,
 345                 .init_chipset   = init_chipset_cmd64x,
 346                 .enablebits     = {{0x51,0x04,0x04}, {0x51,0x08,0x08}},
 347                 .port_ops       = &cmd648_port_ops,
 348                 .host_flags     = IDE_HFLAG_ABUSE_PREFETCH |
 349                                   IDE_HFLAG_SERIALIZE,
 350                 .pio_mask       = ATA_PIO5,
 351                 .mwdma_mask     = ATA_MWDMA2,
 352                 .udma_mask      = ATA_UDMA2,
 353         },
 354         {       /* 2: CMD648 */
 355                 .name           = DRV_NAME,
 356                 .init_chipset   = init_chipset_cmd64x,
 357                 .enablebits     = {{0x51,0x04,0x04}, {0x51,0x08,0x08}},
 358                 .port_ops       = &cmd648_port_ops,
 359                 .host_flags     = IDE_HFLAG_ABUSE_PREFETCH,
 360                 .pio_mask       = ATA_PIO5,
 361                 .mwdma_mask     = ATA_MWDMA2,
 362                 .udma_mask      = ATA_UDMA4,
 363         },
 364         {       /* 3: CMD649 */
 365                 .name           = DRV_NAME,
 366                 .init_chipset   = init_chipset_cmd64x,
 367                 .enablebits     = {{0x51,0x04,0x04}, {0x51,0x08,0x08}},
 368                 .port_ops       = &cmd648_port_ops,
 369                 .host_flags     = IDE_HFLAG_ABUSE_PREFETCH,
 370                 .pio_mask       = ATA_PIO5,
 371                 .mwdma_mask     = ATA_MWDMA2,
 372                 .udma_mask      = ATA_UDMA5,
 373         }
 374 };
 375
 376 static int cmd64x_init_one(struct pci_dev *dev, const struct pci_device_id *id)
 377 {
 378         struct ide_port_info d;
 379         u8 idx = id->driver_data;
 380
 381         d = cmd64x_chipsets[idx];
 382
 383         if (idx == 1) {
 384                 /*
 385                  * UltraDMA only supported on PCI646U and PCI646U2, which
 386                  * correspond to revisions 0x03, 0x05 and 0x07 respectively.
 387                  * Actually, although the CMD tech support people won't
 388                  * tell me the details, the 0x03 revision cannot support
 389                  * UDMA correctly without hardware modifications, and even
 390                  * then it only works with Quantum disks due to some
 391                  * hold time assumptions in the 646U part which are fixed
 392                  * in the 646U2.
 393                  *
 394                  * So we only do UltraDMA on revision 0x05 and 0x07 chipsets.
 395                  */
 396                 if (dev->revision < 5) {
 397                         d.udma_mask = 0x00;
 398                         /*
 399                          * The original PCI0646 didn't have the primary
 400                          * channel enable bit, it appeared starting with
 401                          * PCI0646U (i.e. revision ID 3).
 402                          */
 403                         if (dev->revision < 3) {
 404                                 d.enablebits[0].reg = 0;
 405                                 d.port_ops = &cmd64x_port_ops;
 406                                 if (dev->revision == 1)
 407                                         d.dma_ops = &cmd646_rev1_dma_ops;
 408                         }
 409                 }
 410         }
 411
 412         return ide_pci_init_one(dev, &d, NULL);
 413 }
 414
 415 static const struct pci_device_id cmd64x_pci_tbl[] = {
 416         { PCI_VDEVICE(CMD, PCI_DEVICE_ID_CMD_643), 0 },
 417         { PCI_VDEVICE(CMD, PCI_DEVICE_ID_CMD_646), 1 },
 418         { PCI_VDEVICE(CMD, PCI_DEVICE_ID_CMD_648), 2 },
 419         { PCI_VDEVICE(CMD, PCI_DEVICE_ID_CMD_649), 3 },
 420         { 0, },
 421 };
 422 MODULE_DEVICE_TABLE(pci, cmd64x_pci_tbl);
 423
 424 static struct pci_driver cmd64x_pci_driver = {
 425         .name           = "CMD64x_IDE",
 426         .id_table       = cmd64x_pci_tbl,
 427         .probe          = cmd64x_init_one,
 428         .remove         = ide_pci_remove,
 429         .suspend        = ide_pci_suspend,
 430         .resume         = ide_pci_resume,
 431 };
 432
 433 static int __init cmd64x_ide_init(void)
 434 {
 435         return ide_pci_register_driver(&cmd64x_pci_driver);
 436 }
 437
 438 static void __exit cmd64x_ide_exit(void)
 439 {
 440         pci_unregister_driver(&cmd64x_pci_driver);
 441 }
 442
 443 module_init(cmd64x_ide_init);
 444 module_exit(cmd64x_ide_exit);
 445
 446 MODULE_AUTHOR("Eddie Dost, David Miller, Andre Hedrick, Bartlomiej Zolnierkiewicz");
 447 MODULE_DESCRIPTION("PCI driver module for CMD64x IDE");
 448 MODULE_LICENSE("GPL");