drivers/ata/pata_cmd64x.c

   1 /*
   2  * pata_cmd64x.c        - CMD64x PATA for new ATA layer
   3  *                        (C) 2005 Red Hat Inc
   4  *                        Alan Cox <alan@lxorguk.ukuu.org.uk>
   5  *                        (C) 2009-2010 Bartlomiej Zolnierkiewicz
   6  *
   7  * Based upon
   8  * linux/drivers/ide/pci/cmd64x.c               Version 1.30    Sept 10, 2002
   9  *
  10  * cmd64x.c: Enable interrupts at initialization time on Ultra/PCI machines.
  11  *           Note, this driver is not used at all on other systems because
  12  *           there the "BIOS" has done all of the following already.
  13  *           Due to massive hardware bugs, UltraDMA is only supported
  14  *           on the 646U2 and not on the 646U.
  15  *
  16  * Copyright (C) 1998           Eddie C. Dost  (ecd@skynet.be)
  17  * Copyright (C) 1998           David S. Miller (davem@redhat.com)
  18  *
  19  * Copyright (C) 1999-2002      Andre Hedrick <andre@linux-ide.org>
  20  *
  21  * TODO
  22  *      Testing work
  23  */
  24
  25 #include <linux/kernel.h>
  26 #include <linux/module.h>
  27 #include <linux/pci.h>
  28 #include <linux/init.h>
  29 #include <linux/blkdev.h>
  30 #include <linux/delay.h>
  31 #include <scsi/scsi_host.h>
  32 #include <linux/libata.h>
  33
  34 #define DRV_NAME "pata_cmd64x"
  35 #define DRV_VERSION "0.2.5"
  36
  37 /*
  38  * CMD64x specific registers definition.
  39  */
  40
  41 enum {
  42         CFR             = 0x50,
  43                 CFR_INTR_CH0  = 0x04,
  44         CNTRL           = 0x51,
  45                 CNTRL_CH0     = 0x04,
  46                 CNTRL_CH1     = 0x08,
  47         CMDTIM          = 0x52,
  48         ARTTIM0         = 0x53,
  49         DRWTIM0         = 0x54,
  50         ARTTIM1         = 0x55,
  51         DRWTIM1         = 0x56,
  52         ARTTIM23        = 0x57,
  53                 ARTTIM23_DIS_RA2  = 0x04,
  54                 ARTTIM23_DIS_RA3  = 0x08,
  55                 ARTTIM23_INTR_CH1 = 0x10,
  56         DRWTIM2         = 0x58,
  57         BRST            = 0x59,
  58         DRWTIM3         = 0x5b,
  59         BMIDECR0        = 0x70,
  60         MRDMODE         = 0x71,
  61                 MRDMODE_INTR_CH0 = 0x04,
  62                 MRDMODE_INTR_CH1 = 0x08,
  63         BMIDESR0        = 0x72,
  64         UDIDETCR0       = 0x73,
  65         DTPR0           = 0x74,
  66         BMIDECR1        = 0x78,
  67         BMIDECSR        = 0x79,
  68         UDIDETCR1       = 0x7B,
  69         DTPR1           = 0x7C
  70 };
  71
  72 static int cmd648_cable_detect(struct ata_port *ap)
  73 {
  74         struct pci_dev *pdev = to_pci_dev(ap->host->dev);
  75         u8 r;
  76
  77         /* Check cable detect bits */
  78         pci_read_config_byte(pdev, BMIDECSR, &r);
  79         if (r & (1 << ap->port_no))
  80                 return ATA_CBL_PATA80;
  81         return ATA_CBL_PATA40;
  82 }
  83
  84 /**
  85  *      cmd64x_set_timing       -       set PIO and MWDMA timing
  86  *      @ap: ATA interface
  87  *      @adev: ATA device
  88  *      @mode: mode
  89  *
  90  *      Called to do the PIO and MWDMA mode setup.
  91  */
  92
  93 static void cmd64x_set_timing(struct ata_port *ap, struct ata_device *adev, u8 mode)
  94 {
  95         struct pci_dev *pdev = to_pci_dev(ap->host->dev);
  96         struct ata_timing t;
  97         const unsigned long T = 1000000 / 33;
  98         const u8 setup_data[] = { 0x40, 0x40, 0x40, 0x80, 0x00 };
  99
 100         u8 reg;
 101
 102         /* Port layout is not logical so use a table */
 103         const u8 arttim_port[2][2] = {
 104                 { ARTTIM0, ARTTIM1 },
 105                 { ARTTIM23, ARTTIM23 }
 106         };
 107         const u8 drwtim_port[2][2] = {
 108                 { DRWTIM0, DRWTIM1 },
 109                 { DRWTIM2, DRWTIM3 }
 110         };
 111
 112         int arttim = arttim_port[ap->port_no][adev->devno];
 113         int drwtim = drwtim_port[ap->port_no][adev->devno];
 114
 115         /* ata_timing_compute is smart and will produce timings for MWDMA
 116            that don't violate the drives PIO capabilities. */
 117         if (ata_timing_compute(adev, mode, &t, T, 0) < 0) {
 118                 printk(KERN_ERR DRV_NAME ": mode computation failed.\n");
 119                 return;
 120         }
 121         if (ap->port_no) {
 122                 /* Slave has shared address setup */
 123                 struct ata_device *pair = ata_dev_pair(adev);
 124
 125                 if (pair) {
 126                         struct ata_timing tp;
 127                         ata_timing_compute(pair, pair->pio_mode, &tp, T, 0);
 128                         ata_timing_merge(&t, &tp, &t, ATA_TIMING_SETUP);
 129                 }
 130         }
 131
 132         printk(KERN_DEBUG DRV_NAME ": active %d recovery %d setup %d.\n",
 133                 t.active, t.recover, t.setup);
 134         if (t.recover > 16) {
 135                 t.active += t.recover - 16;
 136                 t.recover = 16;
 137         }
 138         if (t.active > 16)
 139                 t.active = 16;
 140
 141         /* Now convert the clocks into values we can actually stuff into
 142            the chip */
 143
 144         if (t.recover == 16)
 145                 t.recover = 0;
 146         else if (t.recover > 1)
 147                 t.recover--;
 148         else
 149                 t.recover = 15;
 150
 151         if (t.setup > 4)
 152                 t.setup = 0xC0;
 153         else
 154                 t.setup = setup_data[t.setup];
 155
 156         t.active &= 0x0F;       /* 0 = 16 */
 157
 158         /* Load setup timing */
 159         pci_read_config_byte(pdev, arttim, &reg);
 160         reg &= 0x3F;
 161         reg |= t.setup;
 162         pci_write_config_byte(pdev, arttim, reg);
 163
 164         /* Load active/recovery */
 165         pci_write_config_byte(pdev, drwtim, (t.active << 4) | t.recover);
 166 }
 167
 168 /**
 169  *      cmd64x_set_piomode      -       set initial PIO mode data
 170  *      @ap: ATA interface
 171  *      @adev: ATA device
 172  *
 173  *      Used when configuring the devices ot set the PIO timings. All the
 174  *      actual work is done by the PIO/MWDMA setting helper
 175  */
 176
 177 static void cmd64x_set_piomode(struct ata_port *ap, struct ata_device *adev)
 178 {
 179         cmd64x_set_timing(ap, adev, adev->pio_mode);
 180 }
 181
 182 /**
 183  *      cmd64x_set_dmamode      -       set initial DMA mode data
 184  *      @ap: ATA interface
 185  *      @adev: ATA device
 186  *
 187  *      Called to do the DMA mode setup.
 188  */
 189
 190 static void cmd64x_set_dmamode(struct ata_port *ap, struct ata_device *adev)
 191 {
 192         static const u8 udma_data[] = {
 193                 0x30, 0x20, 0x10, 0x20, 0x10, 0x00
 194         };
 195
 196         struct pci_dev *pdev = to_pci_dev(ap->host->dev);
 197         u8 regU, regD;
 198
 199         int pciU = UDIDETCR0 + 8 * ap->port_no;
 200         int pciD = BMIDESR0 + 8 * ap->port_no;
 201         int shift = 2 * adev->devno;
 202
 203         pci_read_config_byte(pdev, pciD, &regD);
 204         pci_read_config_byte(pdev, pciU, &regU);
 205
 206         /* DMA bits off */
 207         regD &= ~(0x20 << adev->devno);
 208         /* DMA control bits */
 209         regU &= ~(0x30 << shift);
 210         /* DMA timing bits */
 211         regU &= ~(0x05 << adev->devno);
 212
 213         if (adev->dma_mode >= XFER_UDMA_0) {
 214                 /* Merge the timing value */
 215                 regU |= udma_data[adev->dma_mode - XFER_UDMA_0] << shift;
 216                 /* Merge the control bits */
 217                 regU |= 1 << adev->devno; /* UDMA on */
 218                 if (adev->dma_mode > XFER_UDMA_2) /* 15nS timing */
 219                         regU |= 4 << adev->devno;
 220         } else {
 221                 regU &= ~ (1 << adev->devno);   /* UDMA off */
 222                 cmd64x_set_timing(ap, adev, adev->dma_mode);
 223         }
 224
 225         regD |= 0x20 << adev->devno;
 226
 227         pci_write_config_byte(pdev, pciU, regU);
 228         pci_write_config_byte(pdev, pciD, regD);
 229 }
 230
 231 /**
 232  *      cmd648_dma_stop -       DMA stop callback
 233  *      @qc: Command in progress
 234  *
 235  *      DMA has completed.
 236  */
 237
 238 static void cmd648_bmdma_stop(struct ata_queued_cmd *qc)
 239 {
 240         struct ata_port *ap = qc->ap;
 241         struct pci_dev *pdev = to_pci_dev(ap->host->dev);
 242         u8 dma_intr;
 243         int dma_mask = ap->port_no ? ARTTIM23_INTR_CH1 : CFR_INTR_CH0;
 244         int dma_reg = ap->port_no ? ARTTIM23 : CFR;
 245
 246         ata_bmdma_stop(qc);
 247
 248         pci_read_config_byte(pdev, dma_reg, &dma_intr);
 249         pci_write_config_byte(pdev, dma_reg, dma_intr | dma_mask);
 250 }
 251
 252 /**
 253  *      cmd646r1_dma_stop       -       DMA stop callback
 254  *      @qc: Command in progress
 255  *
 256  *      Stub for now while investigating the r1 quirk in the old driver.
 257  */
 258
 259 static void cmd646r1_bmdma_stop(struct ata_queued_cmd *qc)
 260 {
 261         ata_bmdma_stop(qc);
 262 }
 263
 264 static struct scsi_host_template cmd64x_sht = {
 265         ATA_BMDMA_SHT(DRV_NAME),
 266 };
 267
 268 static const struct ata_port_operations cmd64x_base_ops = {
 269         .inherits       = &ata_bmdma_port_ops,
 270         .set_piomode    = cmd64x_set_piomode,
 271         .set_dmamode    = cmd64x_set_dmamode,
 272 };
 273
 274 static struct ata_port_operations cmd64x_port_ops = {
 275         .inherits       = &cmd64x_base_ops,
 276         .cable_detect   = ata_cable_40wire,
 277 };
 278
 279 static struct ata_port_operations cmd646r1_port_ops = {
 280         .inherits       = &cmd64x_base_ops,
 281         .bmdma_stop     = cmd646r1_bmdma_stop,
 282         .cable_detect   = ata_cable_40wire,
 283 };
 284
 285 static struct ata_port_operations cmd648_port_ops = {
 286         .inherits       = &cmd64x_base_ops,
 287         .bmdma_stop     = cmd648_bmdma_stop,
 288         .cable_detect   = cmd648_cable_detect,
 289 };
 290
 291 static void cmd64x_fixup(struct pci_dev *pdev)
 292 {
 293         u8 mrdmode;
 294
 295         pci_write_config_byte(pdev, PCI_LATENCY_TIMER, 64);
 296         pci_read_config_byte(pdev, MRDMODE, &mrdmode);
 297         mrdmode &= ~0x30;       /* IRQ set up */
 298         mrdmode |= 0x02;        /* Memory read line enable */
 299         pci_write_config_byte(pdev, MRDMODE, mrdmode);
 300
 301         /* PPC specific fixup copied from old driver */
 302 #ifdef CONFIG_PPC
 303         pci_write_config_byte(pdev, UDIDETCR0, 0xF0);
 304 #endif
 305 }
 306
 307 static int cmd64x_init_one(struct pci_dev *pdev, const struct pci_device_id *id)
 308 {
 309         static const struct ata_port_info cmd_info[6] = {
 310                 {       /* CMD 643 - no UDMA */
 311                         .flags = ATA_FLAG_SLAVE_POSS,
 312                         .pio_mask = ATA_PIO4,
 313                         .mwdma_mask = ATA_MWDMA2,
 314                         .port_ops = &cmd64x_port_ops
 315                 },
 316                 {       /* CMD 646 with broken UDMA */
 317                         .flags = ATA_FLAG_SLAVE_POSS,
 318                         .pio_mask = ATA_PIO4,
 319                         .mwdma_mask = ATA_MWDMA2,
 320                         .port_ops = &cmd64x_port_ops
 321                 },
 322                 {       /* CMD 646 with working UDMA */
 323                         .flags = ATA_FLAG_SLAVE_POSS,
 324                         .pio_mask = ATA_PIO4,
 325                         .mwdma_mask = ATA_MWDMA2,
 326                         .udma_mask = ATA_UDMA2,
 327                         .port_ops = &cmd64x_port_ops
 328                 },
 329                 {       /* CMD 646 rev 1  */
 330                         .flags = ATA_FLAG_SLAVE_POSS,
 331                         .pio_mask = ATA_PIO4,
 332                         .mwdma_mask = ATA_MWDMA2,
 333                         .port_ops = &cmd646r1_port_ops
 334                 },
 335                 {       /* CMD 648 */
 336                         .flags = ATA_FLAG_SLAVE_POSS,
 337                         .pio_mask = ATA_PIO4,
 338                         .mwdma_mask = ATA_MWDMA2,
 339                         .udma_mask = ATA_UDMA4,
 340                         .port_ops = &cmd648_port_ops
 341                 },
 342                 {       /* CMD 649 */
 343                         .flags = ATA_FLAG_SLAVE_POSS,
 344                         .pio_mask = ATA_PIO4,
 345                         .mwdma_mask = ATA_MWDMA2,
 346                         .udma_mask = ATA_UDMA5,
 347                         .port_ops = &cmd648_port_ops
 348                 }
 349         };
 350         const struct ata_port_info *ppi[] = {
 351                 &cmd_info[id->driver_data],
 352                 &cmd_info[id->driver_data],
 353                 NULL
 354         };
 355         u8 reg;
 356         int rc;
 357         struct pci_dev *bridge = pdev->bus->self;
 358         /* mobility split bridges don't report enabled ports correctly */
 359         int port_ok = !(bridge && bridge->vendor ==
 360                         PCI_VENDOR_ID_MOBILITY_ELECTRONICS);
 361         /* all (with exceptions below) apart from 643 have CNTRL_CH0 bit */
 362         int cntrl_ch0_ok = (id->driver_data != 0);
 363
 364         rc = pcim_enable_device(pdev);
 365         if (rc)
 366                 return rc;
 367
 368         if (id->driver_data == 0)       /* 643 */
 369                 ata_pci_bmdma_clear_simplex(pdev);
 370
 371         if (pdev->device == PCI_DEVICE_ID_CMD_646) {
 372                 /* Does UDMA work ? */
 373                 if (pdev->revision > 4) {
 374                         ppi[0] = &cmd_info[2];
 375                         ppi[1] = &cmd_info[2];
 376                 }
 377                 /* Early rev with other problems ? */
 378                 else if (pdev->revision == 1) {
 379                         ppi[0] = &cmd_info[3];
 380                         ppi[1] = &cmd_info[3];
 381                 }
 382                 /* revs 1,2 have no CNTRL_CH0 */
 383                 if (pdev->revision < 3)
 384                         cntrl_ch0_ok = 0;
 385         }
 386
 387         cmd64x_fixup(pdev);
 388
 389         /* check for enabled ports */
 390         pci_read_config_byte(pdev, CNTRL, &reg);
 391         if (!port_ok)
 392                 dev_printk(KERN_NOTICE, &pdev->dev, "Mobility Bridge detected, ignoring CNTRL port enable/disable\n");
 393         if (port_ok && cntrl_ch0_ok && !(reg & CNTRL_CH0)) {
 394                 dev_printk(KERN_NOTICE, &pdev->dev, "Primary port is disabled\n");
 395                 ppi[0] = &ata_dummy_port_info;
 396
 397         }
 398         if (port_ok && !(reg & CNTRL_CH1)) {
 399                 dev_printk(KERN_NOTICE, &pdev->dev, "Secondary port is disabled\n");
 400                 ppi[1] = &ata_dummy_port_info;
 401         }
 402
 403         return ata_pci_bmdma_init_one(pdev, ppi, &cmd64x_sht, NULL, 0);
 404 }
 405
 406 #ifdef CONFIG_PM
 407 static int cmd64x_reinit_one(struct pci_dev *pdev)
 408 {
 409         struct ata_host *host = dev_get_drvdata(&pdev->dev);
 410         int rc;
 411
 412         rc = ata_pci_device_do_resume(pdev);
 413         if (rc)
 414                 return rc;
 415
 416         cmd64x_fixup(pdev);
 417
 418         ata_host_resume(host);
 419         return 0;
 420 }
 421 #endif
 422
 423 static const struct pci_device_id cmd64x[] = {
 424         { PCI_VDEVICE(CMD, PCI_DEVICE_ID_CMD_643), 0 },
 425         { PCI_VDEVICE(CMD, PCI_DEVICE_ID_CMD_646), 1 },
 426         { PCI_VDEVICE(CMD, PCI_DEVICE_ID_CMD_648), 4 },
 427         { PCI_VDEVICE(CMD, PCI_DEVICE_ID_CMD_649), 5 },
 428
 429         { },
 430 };
 431
 432 static struct pci_driver cmd64x_pci_driver = {
 433         .name           = DRV_NAME,
 434         .id_table       = cmd64x,
 435         .probe          = cmd64x_init_one,
 436         .remove         = ata_pci_remove_one,
 437 #ifdef CONFIG_PM
 438         .suspend        = ata_pci_device_suspend,
 439         .resume         = cmd64x_reinit_one,
 440 #endif
 441 };
 442
 443 static int __init cmd64x_init(void)
 444 {
 445         return pci_register_driver(&cmd64x_pci_driver);
 446 }
 447
 448 static void __exit cmd64x_exit(void)
 449 {
 450         pci_unregister_driver(&cmd64x_pci_driver);
 451 }
 452
 453 MODULE_AUTHOR("Alan Cox");
 454 MODULE_DESCRIPTION("low-level driver for CMD64x series PATA controllers");
 455 MODULE_LICENSE("GPL");
 456 MODULE_DEVICE_TABLE(pci, cmd64x);
 457 MODULE_VERSION(DRV_VERSION);
 458
 459 module_init(cmd64x_init);
 460 module_exit(cmd64x_exit);