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  *
   6  * Based upon
   7  * linux/drivers/ide/pci/cmd64x.c               Version 1.30    Sept 10, 2002
   8  *
   9  * cmd64x.c: Enable interrupts at initialization time on Ultra/PCI machines.
  10  *           Note, this driver is not used at all on other systems because
  11  *           there the "BIOS" has done all of the following already.
  12  *           Due to massive hardware bugs, UltraDMA is only supported
  13  *           on the 646U2 and not on the 646U.
  14  *
  15  * Copyright (C) 1998           Eddie C. Dost  (ecd@skynet.be)
  16  * Copyright (C) 1998           David S. Miller (davem@redhat.com)
  17  *
  18  * Copyright (C) 1999-2002      Andre Hedrick <andre@linux-ide.org>
  19  *
  20  * TODO
  21  *      Testing work
  22  */
  23
  24 #include <linux/kernel.h>
  25 #include <linux/module.h>
  26 #include <linux/pci.h>
  27 #include <linux/init.h>
  28 #include <linux/blkdev.h>
  29 #include <linux/delay.h>
  30 #include <scsi/scsi_host.h>
  31 #include <linux/libata.h>
  32
  33 #define DRV_NAME "pata_cmd64x"
  34 #define DRV_VERSION "0.2.5"
  35
  36 /*
  37  * CMD64x specific registers definition.
  38  */
  39
  40 enum {
  41         CFR             = 0x50,
  42                 CFR_INTR_CH0  = 0x02,
  43         CNTRL           = 0x51,
  44                 CNTRL_DIS_RA0 = 0x40,
  45                 CNTRL_DIS_RA1 = 0x80,
  46                 CNTRL_ENA_2ND = 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         ARTTIM2         = 0x57,
  57         ARTTIM3         = 0x57,
  58         DRWTIM23        = 0x58,
  59         DRWTIM2         = 0x58,
  60         BRST            = 0x59,
  61         DRWTIM3         = 0x5b,
  62         BMIDECR0        = 0x70,
  63         MRDMODE         = 0x71,
  64                 MRDMODE_INTR_CH0 = 0x04,
  65                 MRDMODE_INTR_CH1 = 0x08,
  66                 MRDMODE_BLK_CH0  = 0x10,
  67                 MRDMODE_BLK_CH1  = 0x20,
  68         BMIDESR0        = 0x72,
  69         UDIDETCR0       = 0x73,
  70         DTPR0           = 0x74,
  71         BMIDECR1        = 0x78,
  72         BMIDECSR        = 0x79,
  73         BMIDESR1        = 0x7A,
  74         UDIDETCR1       = 0x7B,
  75         DTPR1           = 0x7C
  76 };
  77
  78 static int cmd648_cable_detect(struct ata_port *ap)
  79 {
  80         struct pci_dev *pdev = to_pci_dev(ap->host->dev);
  81         u8 r;
  82
  83         /* Check cable detect bits */
  84         pci_read_config_byte(pdev, BMIDECSR, &r);
  85         if (r & (1 << ap->port_no))
  86                 return ATA_CBL_PATA80;
  87         return ATA_CBL_PATA40;
  88 }
  89
  90 /**
  91  *      cmd64x_set_piomode      -       set PIO and MWDMA timing
  92  *      @ap: ATA interface
  93  *      @adev: ATA device
  94  *      @mode: mode
  95  *
  96  *      Called to do the PIO and MWDMA mode setup.
  97  */
  98
  99 static void cmd64x_set_timing(struct ata_port *ap, struct ata_device *adev, u8 mode)
 100 {
 101         struct pci_dev *pdev = to_pci_dev(ap->host->dev);
 102         struct ata_timing t;
 103         const unsigned long T = 1000000 / 33;
 104         const u8 setup_data[] = { 0x40, 0x40, 0x40, 0x80, 0x00 };
 105
 106         u8 reg;
 107
 108         /* Port layout is not logical so use a table */
 109         const u8 arttim_port[2][2] = {
 110                 { ARTTIM0, ARTTIM1 },
 111                 { ARTTIM23, ARTTIM23 }
 112         };
 113         const u8 drwtim_port[2][2] = {
 114                 { DRWTIM0, DRWTIM1 },
 115                 { DRWTIM2, DRWTIM3 }
 116         };
 117
 118         int arttim = arttim_port[ap->port_no][adev->devno];
 119         int drwtim = drwtim_port[ap->port_no][adev->devno];
 120
 121         /* ata_timing_compute is smart and will produce timings for MWDMA
 122            that don't violate the drives PIO capabilities. */
 123         if (ata_timing_compute(adev, mode, &t, T, 0) < 0) {
 124                 printk(KERN_ERR DRV_NAME ": mode computation failed.\n");
 125                 return;
 126         }
 127         if (ap->port_no) {
 128                 /* Slave has shared address setup */
 129                 struct ata_device *pair = ata_dev_pair(adev);
 130
 131                 if (pair) {
 132                         struct ata_timing tp;
 133                         ata_timing_compute(pair, pair->pio_mode, &tp, T, 0);
 134                         ata_timing_merge(&t, &tp, &t, ATA_TIMING_SETUP);
 135                 }
 136         }
 137
 138         printk(KERN_DEBUG DRV_NAME ": active %d recovery %d setup %d.\n",
 139                 t.active, t.recover, t.setup);
 140         if (t.recover > 16) {
 141                 t.active += t.recover - 16;
 142                 t.recover = 16;
 143         }
 144         if (t.active > 16)
 145                 t.active = 16;
 146
 147         /* Now convert the clocks into values we can actually stuff into
 148            the chip */
 149
 150         if (t.recover > 1)
 151                 t.recover--;
 152         else
 153                 t.recover = 15;
 154
 155         if (t.setup > 4)
 156                 t.setup = 0xC0;
 157         else
 158                 t.setup = setup_data[t.setup];
 159
 160         t.active &= 0x0F;       /* 0 = 16 */
 161
 162         /* Load setup timing */
 163         pci_read_config_byte(pdev, arttim, &reg);
 164         reg &= 0x3F;
 165         reg |= t.setup;
 166         pci_write_config_byte(pdev, arttim, reg);
 167
 168         /* Load active/recovery */
 169         pci_write_config_byte(pdev, drwtim, (t.active << 4) | t.recover);
 170 }
 171
 172 /**
 173  *      cmd64x_set_piomode      -       set initial PIO mode data
 174  *      @ap: ATA interface
 175  *      @adev: ATA device
 176  *
 177  *      Used when configuring the devices ot set the PIO timings. All the
 178  *      actual work is done by the PIO/MWDMA setting helper
 179  */
 180
 181 static void cmd64x_set_piomode(struct ata_port *ap, struct ata_device *adev)
 182 {
 183         cmd64x_set_timing(ap, adev, adev->pio_mode);
 184 }
 185
 186 /**
 187  *      cmd64x_set_dmamode      -       set initial DMA mode data
 188  *      @ap: ATA interface
 189  *      @adev: ATA device
 190  *
 191  *      Called to do the DMA mode setup.
 192  */
 193
 194 static void cmd64x_set_dmamode(struct ata_port *ap, struct ata_device *adev)
 195 {
 196         static const u8 udma_data[] = {
 197                 0x30, 0x20, 0x10, 0x20, 0x10, 0x00
 198         };
 199
 200         struct pci_dev *pdev = to_pci_dev(ap->host->dev);
 201         u8 regU, regD;
 202
 203         int pciU = UDIDETCR0 + 8 * ap->port_no;
 204         int pciD = BMIDESR0 + 8 * ap->port_no;
 205         int shift = 2 * adev->devno;
 206
 207         pci_read_config_byte(pdev, pciD, &regD);
 208         pci_read_config_byte(pdev, pciU, &regU);
 209
 210         /* DMA bits off */
 211         regD &= ~(0x20 << adev->devno);
 212         /* DMA control bits */
 213         regU &= ~(0x30 << shift);
 214         /* DMA timing bits */
 215         regU &= ~(0x05 << adev->devno);
 216
 217         if (adev->dma_mode >= XFER_UDMA_0) {
 218                 /* Merge the timing value */
 219                 regU |= udma_data[adev->dma_mode - XFER_UDMA_0] << shift;
 220                 /* Merge the control bits */
 221                 regU |= 1 << adev->devno; /* UDMA on */
 222                 if (adev->dma_mode > XFER_UDMA_2) /* 15nS timing */
 223                         regU |= 4 << adev->devno;
 224         } else {
 225                 regU &= ~ (1 << adev->devno);   /* UDMA off */
 226                 cmd64x_set_timing(ap, adev, adev->dma_mode);
 227         }
 228
 229         regD |= 0x20 << adev->devno;
 230
 231         pci_write_config_byte(pdev, pciU, regU);
 232         pci_write_config_byte(pdev, pciD, regD);
 233 }
 234
 235 /**
 236  *      cmd648_dma_stop -       DMA stop callback
 237  *      @qc: Command in progress
 238  *
 239  *      DMA has completed.
 240  */
 241
 242 static void cmd648_bmdma_stop(struct ata_queued_cmd *qc)
 243 {
 244         struct ata_port *ap = qc->ap;
 245         struct pci_dev *pdev = to_pci_dev(ap->host->dev);
 246         u8 dma_intr;
 247         int dma_mask = ap->port_no ? ARTTIM23_INTR_CH1 : CFR_INTR_CH0;
 248         int dma_reg = ap->port_no ? ARTTIM2 : CFR;
 249
 250         ata_bmdma_stop(qc);
 251
 252         pci_read_config_byte(pdev, dma_reg, &dma_intr);
 253         pci_write_config_byte(pdev, dma_reg, dma_intr | dma_mask);
 254 }
 255
 256 /**
 257  *      cmd646r1_dma_stop       -       DMA stop callback
 258  *      @qc: Command in progress
 259  *
 260  *      Stub for now while investigating the r1 quirk in the old driver.
 261  */
 262
 263 static void cmd646r1_bmdma_stop(struct ata_queued_cmd *qc)
 264 {
 265         ata_bmdma_stop(qc);
 266 }
 267
 268 static struct scsi_host_template cmd64x_sht = {
 269         ATA_BMDMA_SHT(DRV_NAME),
 270 };
 271
 272 static const struct ata_port_operations cmd64x_base_ops = {
 273         .inherits       = &ata_bmdma_port_ops,
 274         .set_piomode    = cmd64x_set_piomode,
 275         .set_dmamode    = cmd64x_set_dmamode,
 276 };
 277
 278 static struct ata_port_operations cmd64x_port_ops = {
 279         .inherits       = &cmd64x_base_ops,
 280         .cable_detect   = ata_cable_40wire,
 281 };
 282
 283 static struct ata_port_operations cmd646r1_port_ops = {
 284         .inherits       = &cmd64x_base_ops,
 285         .bmdma_stop     = cmd646r1_bmdma_stop,
 286         .cable_detect   = ata_cable_40wire,
 287 };
 288
 289 static struct ata_port_operations cmd648_port_ops = {
 290         .inherits       = &cmd64x_base_ops,
 291         .bmdma_stop     = cmd648_bmdma_stop,
 292         .cable_detect   = cmd648_cable_detect,
 293 };
 294
 295 static int cmd64x_init_one(struct pci_dev *pdev, const struct pci_device_id *id)
 296 {
 297         static const struct ata_port_info cmd_info[6] = {
 298                 {       /* CMD 643 - no UDMA */
 299                         .flags = ATA_FLAG_SLAVE_POSS,
 300                         .pio_mask = ATA_PIO4,
 301                         .mwdma_mask = ATA_MWDMA2,
 302                         .port_ops = &cmd64x_port_ops
 303                 },
 304                 {       /* CMD 646 with broken UDMA */
 305                         .flags = ATA_FLAG_SLAVE_POSS,
 306                         .pio_mask = ATA_PIO4,
 307                         .mwdma_mask = ATA_MWDMA2,
 308                         .port_ops = &cmd64x_port_ops
 309                 },
 310                 {       /* CMD 646 with working UDMA */
 311                         .flags = ATA_FLAG_SLAVE_POSS,
 312                         .pio_mask = ATA_PIO4,
 313                         .mwdma_mask = ATA_MWDMA2,
 314                         .udma_mask = ATA_UDMA2,
 315                         .port_ops = &cmd64x_port_ops
 316                 },
 317                 {       /* CMD 646 rev 1  */
 318                         .flags = ATA_FLAG_SLAVE_POSS,
 319                         .pio_mask = ATA_PIO4,
 320                         .mwdma_mask = ATA_MWDMA2,
 321                         .port_ops = &cmd646r1_port_ops
 322                 },
 323                 {       /* CMD 648 */
 324                         .flags = ATA_FLAG_SLAVE_POSS,
 325                         .pio_mask = ATA_PIO4,
 326                         .mwdma_mask = ATA_MWDMA2,
 327                         .udma_mask = ATA_UDMA4,
 328                         .port_ops = &cmd648_port_ops
 329                 },
 330                 {       /* CMD 649 */
 331                         .flags = ATA_FLAG_SLAVE_POSS,
 332                         .pio_mask = ATA_PIO4,
 333                         .mwdma_mask = ATA_MWDMA2,
 334                         .udma_mask = ATA_UDMA5,
 335                         .port_ops = &cmd648_port_ops
 336                 }
 337         };
 338         const struct ata_port_info *ppi[] = { &cmd_info[id->driver_data], NULL };
 339         u8 mrdmode;
 340         int rc;
 341
 342         rc = pcim_enable_device(pdev);
 343         if (rc)
 344                 return rc;
 345
 346         if (id->driver_data == 0)       /* 643 */
 347                 ata_pci_bmdma_clear_simplex(pdev);
 348
 349         if (pdev->device == PCI_DEVICE_ID_CMD_646) {
 350                 /* Does UDMA work ? */
 351                 if (pdev->revision > 4)
 352                         ppi[0] = &cmd_info[2];
 353                 /* Early rev with other problems ? */
 354                 else if (pdev->revision == 1)
 355                         ppi[0] = &cmd_info[3];
 356         }
 357
 358         pci_write_config_byte(pdev, PCI_LATENCY_TIMER, 64);
 359         pci_read_config_byte(pdev, MRDMODE, &mrdmode);
 360         mrdmode &= ~ 0x30;      /* IRQ set up */
 361         mrdmode |= 0x02;        /* Memory read line enable */
 362         pci_write_config_byte(pdev, MRDMODE, mrdmode);
 363
 364         /* Force PIO 0 here.. */
 365
 366         /* PPC specific fixup copied from old driver */
 367 #ifdef CONFIG_PPC
 368         pci_write_config_byte(pdev, UDIDETCR0, 0xF0);
 369 #endif
 370
 371         return ata_pci_sff_init_one(pdev, ppi, &cmd64x_sht, NULL);
 372 }
 373
 374 #ifdef CONFIG_PM
 375 static int cmd64x_reinit_one(struct pci_dev *pdev)
 376 {
 377         struct ata_host *host = dev_get_drvdata(&pdev->dev);
 378         u8 mrdmode;
 379         int rc;
 380
 381         rc = ata_pci_device_do_resume(pdev);
 382         if (rc)
 383                 return rc;
 384
 385         pci_write_config_byte(pdev, PCI_LATENCY_TIMER, 64);
 386         pci_read_config_byte(pdev, MRDMODE, &mrdmode);
 387         mrdmode &= ~ 0x30;      /* IRQ set up */
 388         mrdmode |= 0x02;        /* Memory read line enable */
 389         pci_write_config_byte(pdev, MRDMODE, mrdmode);
 390 #ifdef CONFIG_PPC
 391         pci_write_config_byte(pdev, UDIDETCR0, 0xF0);
 392 #endif
 393         ata_host_resume(host);
 394         return 0;
 395 }
 396 #endif
 397
 398 static const struct pci_device_id cmd64x[] = {
 399         { PCI_VDEVICE(CMD, PCI_DEVICE_ID_CMD_643), 0 },
 400         { PCI_VDEVICE(CMD, PCI_DEVICE_ID_CMD_646), 1 },
 401         { PCI_VDEVICE(CMD, PCI_DEVICE_ID_CMD_648), 4 },
 402         { PCI_VDEVICE(CMD, PCI_DEVICE_ID_CMD_649), 5 },
 403
 404         { },
 405 };
 406
 407 static struct pci_driver cmd64x_pci_driver = {
 408         .name           = DRV_NAME,
 409         .id_table       = cmd64x,
 410         .probe          = cmd64x_init_one,
 411         .remove         = ata_pci_remove_one,
 412 #ifdef CONFIG_PM
 413         .suspend        = ata_pci_device_suspend,
 414         .resume         = cmd64x_reinit_one,
 415 #endif
 416 };
 417
 418 static int __init cmd64x_init(void)
 419 {
 420         return pci_register_driver(&cmd64x_pci_driver);
 421 }
 422
 423 static void __exit cmd64x_exit(void)
 424 {
 425         pci_unregister_driver(&cmd64x_pci_driver);
 426 }
 427
 428 MODULE_AUTHOR("Alan Cox");
 429 MODULE_DESCRIPTION("low-level driver for CMD64x series PATA controllers");
 430 MODULE_LICENSE("GPL");
 431 MODULE_DEVICE_TABLE(pci, cmd64x);
 432 MODULE_VERSION(DRV_VERSION);
 433
 434 module_init(cmd64x_init);
 435 module_exit(cmd64x_exit);