drivers/ata/pata_cmd64x.c

   1 // SPDX-License-Identifier: GPL-2.0-only
   2 /*
   3  * pata_cmd64x.c        - CMD64x PATA for new ATA layer
   4  *                        (C) 2005 Red Hat Inc
   5  *                        Alan Cox <alan@lxorguk.ukuu.org.uk>
   6  *                        (C) 2009-2010 Bartlomiej Zolnierkiewicz
   7  *                        (C) 2012 MontaVista Software, LLC <source@mvista.com>
   8  *
   9  * Based upon
  10  * linux/drivers/ide/pci/cmd64x.c               Version 1.30    Sept 10, 2002
  11  *
  12  * cmd64x.c: Enable interrupts at initialization time on Ultra/PCI machines.
  13  *           Note, this driver is not used at all on other systems because
  14  *           there the "BIOS" has done all of the following already.
  15  *           Due to massive hardware bugs, UltraDMA is only supported
  16  *           on the 646U2 and not on the 646U.
  17  *
  18  * Copyright (C) 1998           Eddie C. Dost  (ecd@skynet.be)
  19  * Copyright (C) 1998           David S. Miller (davem@redhat.com)
  20  *
  21  * Copyright (C) 1999-2002      Andre Hedrick <andre@linux-ide.org>
  22  *
  23  * TODO
  24  *      Testing work
  25  */
  26
  27 #include <linux/kernel.h>
  28 #include <linux/module.h>
  29 #include <linux/pci.h>
  30 #include <linux/blkdev.h>
  31 #include <linux/delay.h>
  32 #include <scsi/scsi_host.h>
  33 #include <linux/libata.h>
  34
  35 #define DRV_NAME "pata_cmd64x"
  36 #define DRV_VERSION "0.2.18"
  37
  38 /*
  39  * CMD64x specific registers definition.
  40  */
  41
  42 enum {
  43         CFR             = 0x50,
  44                 CFR_INTR_CH0  = 0x04,
  45         CNTRL           = 0x51,
  46                 CNTRL_CH0     = 0x04,
  47                 CNTRL_CH1     = 0x08,
  48         CMDTIM          = 0x52,
  49         ARTTIM0         = 0x53,
  50         DRWTIM0         = 0x54,
  51         ARTTIM1         = 0x55,
  52         DRWTIM1         = 0x56,
  53         ARTTIM23        = 0x57,
  54                 ARTTIM23_DIS_RA2  = 0x04,
  55                 ARTTIM23_DIS_RA3  = 0x08,
  56                 ARTTIM23_INTR_CH1 = 0x10,
  57         DRWTIM2         = 0x58,
  58         BRST            = 0x59,
  59         DRWTIM3         = 0x5b,
  60         BMIDECR0        = 0x70,
  61         MRDMODE         = 0x71,
  62                 MRDMODE_INTR_CH0 = 0x04,
  63                 MRDMODE_INTR_CH1 = 0x08,
  64         BMIDESR0        = 0x72,
  65         UDIDETCR0       = 0x73,
  66         DTPR0           = 0x74,
  67         BMIDECR1        = 0x78,
  68         BMIDECSR        = 0x79,
  69         UDIDETCR1       = 0x7B,
  70         DTPR1           = 0x7C
  71 };
  72
  73 static int cmd648_cable_detect(struct ata_port *ap)
  74 {
  75         struct pci_dev *pdev = to_pci_dev(ap->host->dev);
  76         u8 r;
  77
  78         /* Check cable detect bits */
  79         pci_read_config_byte(pdev, BMIDECSR, &r);
  80         if (r & (1 << ap->port_no))
  81                 return ATA_CBL_PATA80;
  82         return ATA_CBL_PATA40;
  83 }
  84
  85 /**
  86  *      cmd64x_set_timing       -       set PIO and MWDMA timing
  87  *      @ap: ATA interface
  88  *      @adev: ATA device
  89  *      @mode: mode
  90  *
  91  *      Called to do the PIO and MWDMA mode setup.
  92  */
  93
  94 static void cmd64x_set_timing(struct ata_port *ap, struct ata_device *adev, u8 mode)
  95 {
  96         struct pci_dev *pdev = to_pci_dev(ap->host->dev);
  97         struct ata_timing t;
  98         const unsigned long T = 1000000 / 33;
  99         const u8 setup_data[] = { 0x40, 0x40, 0x40, 0x80, 0x00 };
 100
 101         u8 reg;
 102
 103         /* Port layout is not logical so use a table */
 104         const u8 arttim_port[2][2] = {
 105                 { ARTTIM0, ARTTIM1 },
 106                 { ARTTIM23, ARTTIM23 }
 107         };
 108         const u8 drwtim_port[2][2] = {
 109                 { DRWTIM0, DRWTIM1 },
 110                 { DRWTIM2, DRWTIM3 }
 111         };
 112
 113         int arttim = arttim_port[ap->port_no][adev->devno];
 114         int drwtim = drwtim_port[ap->port_no][adev->devno];
 115
 116         /* ata_timing_compute is smart and will produce timings for MWDMA
 117            that don't violate the drives PIO capabilities. */
 118         if (ata_timing_compute(adev, mode, &t, T, 0) < 0) {
 119                 printk(KERN_ERR DRV_NAME ": mode computation failed.\n");
 120                 return;
 121         }
 122         if (ap->port_no) {
 123                 /* Slave has shared address setup */
 124                 struct ata_device *pair = ata_dev_pair(adev);
 125
 126                 if (pair) {
 127                         struct ata_timing tp;
 128                         ata_timing_compute(pair, pair->pio_mode, &tp, T, 0);
 129                         ata_timing_merge(&t, &tp, &t, ATA_TIMING_SETUP);
 130                 }
 131         }
 132
 133         printk(KERN_DEBUG DRV_NAME ": active %d recovery %d setup %d.\n",
 134                 t.active, t.recover, t.setup);
 135         if (t.recover > 16) {
 136                 t.active += t.recover - 16;
 137                 t.recover = 16;
 138         }
 139         if (t.active > 16)
 140                 t.active = 16;
 141
 142         /* Now convert the clocks into values we can actually stuff into
 143            the chip */
 144
 145         if (t.recover == 16)
 146                 t.recover = 0;
 147         else if (t.recover > 1)
 148                 t.recover--;
 149         else
 150                 t.recover = 15;
 151
 152         if (t.setup > 4)
 153                 t.setup = 0xC0;
 154         else
 155                 t.setup = setup_data[t.setup];
 156
 157         t.active &= 0x0F;       /* 0 = 16 */
 158
 159         /* Load setup timing */
 160         pci_read_config_byte(pdev, arttim, &reg);
 161         reg &= 0x3F;
 162         reg |= t.setup;
 163         pci_write_config_byte(pdev, arttim, reg);
 164
 165         /* Load active/recovery */
 166         pci_write_config_byte(pdev, drwtim, (t.active << 4) | t.recover);
 167 }
 168
 169 /**
 170  *      cmd64x_set_piomode      -       set initial PIO mode data
 171  *      @ap: ATA interface
 172  *      @adev: ATA device
 173  *
 174  *      Used when configuring the devices ot set the PIO timings. All the
 175  *      actual work is done by the PIO/MWDMA setting helper
 176  */
 177
 178 static void cmd64x_set_piomode(struct ata_port *ap, struct ata_device *adev)
 179 {
 180         cmd64x_set_timing(ap, adev, adev->pio_mode);
 181 }
 182
 183 /**
 184  *      cmd64x_set_dmamode      -       set initial DMA mode data
 185  *      @ap: ATA interface
 186  *      @adev: ATA device
 187  *
 188  *      Called to do the DMA mode setup.
 189  */
 190
 191 static void cmd64x_set_dmamode(struct ata_port *ap, struct ata_device *adev)
 192 {
 193         static const u8 udma_data[] = {
 194                 0x30, 0x20, 0x10, 0x20, 0x10, 0x00
 195         };
 196
 197         struct pci_dev *pdev = to_pci_dev(ap->host->dev);
 198         u8 regU, regD;
 199
 200         int pciU = UDIDETCR0 + 8 * ap->port_no;
 201         int pciD = BMIDESR0 + 8 * ap->port_no;
 202         int shift = 2 * adev->devno;
 203
 204         pci_read_config_byte(pdev, pciD, &regD);
 205         pci_read_config_byte(pdev, pciU, &regU);
 206
 207         /* DMA bits off */
 208         regD &= ~(0x20 << adev->devno);
 209         /* DMA control bits */
 210         regU &= ~(0x30 << shift);
 211         /* DMA timing bits */
 212         regU &= ~(0x05 << adev->devno);
 213
 214         if (adev->dma_mode >= XFER_UDMA_0) {
 215                 /* Merge the timing value */
 216                 regU |= udma_data[adev->dma_mode - XFER_UDMA_0] << shift;
 217                 /* Merge the control bits */
 218                 regU |= 1 << adev->devno; /* UDMA on */
 219                 if (adev->dma_mode > XFER_UDMA_2) /* 15nS timing */
 220                         regU |= 4 << adev->devno;
 221         } else {
 222                 regU &= ~ (1 << adev->devno);   /* UDMA off */
 223                 cmd64x_set_timing(ap, adev, adev->dma_mode);
 224         }
 225
 226         regD |= 0x20 << adev->devno;
 227
 228         pci_write_config_byte(pdev, pciU, regU);
 229         pci_write_config_byte(pdev, pciD, regD);
 230 }
 231
 232 /**
 233  *      cmd64x_sff_irq_check    -       check IDE interrupt
 234  *      @ap: ATA interface
 235  *
 236  *      Check IDE interrupt in CFR/ARTTIM23 registers.
 237  */
 238
 239 static bool cmd64x_sff_irq_check(struct ata_port *ap)
 240 {
 241         struct pci_dev *pdev = to_pci_dev(ap->host->dev);
 242         int irq_mask = ap->port_no ? ARTTIM23_INTR_CH1 : CFR_INTR_CH0;
 243         int irq_reg  = ap->port_no ? ARTTIM23 : CFR;
 244         u8 irq_stat;
 245
 246         /* NOTE: reading the register should clear the interrupt */
 247         pci_read_config_byte(pdev, irq_reg, &irq_stat);
 248
 249         return irq_stat & irq_mask;
 250 }
 251
 252 /**
 253  *      cmd64x_sff_irq_clear    -       clear IDE interrupt
 254  *      @ap: ATA interface
 255  *
 256  *      Clear IDE interrupt in CFR/ARTTIM23 and DMA status registers.
 257  */
 258
 259 static void cmd64x_sff_irq_clear(struct ata_port *ap)
 260 {
 261         struct pci_dev *pdev = to_pci_dev(ap->host->dev);
 262         int irq_reg = ap->port_no ? ARTTIM23 : CFR;
 263         u8 irq_stat;
 264
 265         ata_bmdma_irq_clear(ap);
 266
 267         /* Reading the register should be enough to clear the interrupt */
 268         pci_read_config_byte(pdev, irq_reg, &irq_stat);
 269 }
 270
 271 /**
 272  *      cmd648_sff_irq_check    -       check IDE interrupt
 273  *      @ap: ATA interface
 274  *
 275  *      Check IDE interrupt in MRDMODE register.
 276  */
 277
 278 static bool cmd648_sff_irq_check(struct ata_port *ap)
 279 {
 280         struct pci_dev *pdev = to_pci_dev(ap->host->dev);
 281         unsigned long base = pci_resource_start(pdev, 4);
 282         int irq_mask = ap->port_no ? MRDMODE_INTR_CH1 : MRDMODE_INTR_CH0;
 283         u8 mrdmode = inb(base + 1);
 284
 285         return mrdmode & irq_mask;
 286 }
 287
 288 /**
 289  *      cmd648_sff_irq_clear    -       clear IDE interrupt
 290  *      @ap: ATA interface
 291  *
 292  *      Clear IDE interrupt in MRDMODE and DMA status registers.
 293  */
 294
 295 static void cmd648_sff_irq_clear(struct ata_port *ap)
 296 {
 297         struct pci_dev *pdev = to_pci_dev(ap->host->dev);
 298         unsigned long base = pci_resource_start(pdev, 4);
 299         int irq_mask = ap->port_no ? MRDMODE_INTR_CH1 : MRDMODE_INTR_CH0;
 300         u8 mrdmode;
 301
 302         ata_bmdma_irq_clear(ap);
 303
 304         /* Clear this port's interrupt bit (leaving the other port alone) */
 305         mrdmode  = inb(base + 1);
 306         mrdmode &= ~(MRDMODE_INTR_CH0 | MRDMODE_INTR_CH1);
 307         outb(mrdmode | irq_mask, base + 1);
 308 }
 309
 310 /**
 311  *      cmd646r1_bmdma_stop     -       DMA stop callback
 312  *      @qc: Command in progress
 313  *
 314  *      Stub for now while investigating the r1 quirk in the old driver.
 315  */
 316
 317 static void cmd646r1_bmdma_stop(struct ata_queued_cmd *qc)
 318 {
 319         ata_bmdma_stop(qc);
 320 }
 321
 322 static struct scsi_host_template cmd64x_sht = {
 323         ATA_BMDMA_SHT(DRV_NAME),
 324 };
 325
 326 static const struct ata_port_operations cmd64x_base_ops = {
 327         .inherits       = &ata_bmdma_port_ops,
 328         .set_piomode    = cmd64x_set_piomode,
 329         .set_dmamode    = cmd64x_set_dmamode,
 330 };
 331
 332 static struct ata_port_operations cmd64x_port_ops = {
 333         .inherits       = &cmd64x_base_ops,
 334         .sff_irq_check  = cmd64x_sff_irq_check,
 335         .sff_irq_clear  = cmd64x_sff_irq_clear,
 336         .cable_detect   = ata_cable_40wire,
 337 };
 338
 339 static struct ata_port_operations cmd646r1_port_ops = {
 340         .inherits       = &cmd64x_base_ops,
 341         .sff_irq_check  = cmd64x_sff_irq_check,
 342         .sff_irq_clear  = cmd64x_sff_irq_clear,
 343         .bmdma_stop     = cmd646r1_bmdma_stop,
 344         .cable_detect   = ata_cable_40wire,
 345 };
 346
 347 static struct ata_port_operations cmd646r3_port_ops = {
 348         .inherits       = &cmd64x_base_ops,
 349         .sff_irq_check  = cmd648_sff_irq_check,
 350         .sff_irq_clear  = cmd648_sff_irq_clear,
 351         .cable_detect   = ata_cable_40wire,
 352 };
 353
 354 static struct ata_port_operations cmd648_port_ops = {
 355         .inherits       = &cmd64x_base_ops,
 356         .sff_irq_check  = cmd648_sff_irq_check,
 357         .sff_irq_clear  = cmd648_sff_irq_clear,
 358         .cable_detect   = cmd648_cable_detect,
 359 };
 360
 361 static void cmd64x_fixup(struct pci_dev *pdev)
 362 {
 363         u8 mrdmode;
 364
 365         pci_write_config_byte(pdev, PCI_LATENCY_TIMER, 64);
 366         pci_read_config_byte(pdev, MRDMODE, &mrdmode);
 367         mrdmode &= ~0x30;       /* IRQ set up */
 368         mrdmode |= 0x02;        /* Memory read line enable */
 369         pci_write_config_byte(pdev, MRDMODE, mrdmode);
 370
 371         /* PPC specific fixup copied from old driver */
 372 #ifdef CONFIG_PPC
 373         pci_write_config_byte(pdev, UDIDETCR0, 0xF0);
 374 #endif
 375 }
 376
 377 static int cmd64x_init_one(struct pci_dev *pdev, const struct pci_device_id *id)
 378 {
 379         static const struct ata_port_info cmd_info[7] = {
 380                 {       /* CMD 643 - no UDMA */
 381                         .flags = ATA_FLAG_SLAVE_POSS,
 382                         .pio_mask = ATA_PIO4,
 383                         .mwdma_mask = ATA_MWDMA2,
 384                         .port_ops = &cmd64x_port_ops
 385                 },
 386                 {       /* CMD 646 with broken UDMA */
 387                         .flags = ATA_FLAG_SLAVE_POSS,
 388                         .pio_mask = ATA_PIO4,
 389                         .mwdma_mask = ATA_MWDMA2,
 390                         .port_ops = &cmd64x_port_ops
 391                 },
 392                 {       /* CMD 646U with broken UDMA */
 393                         .flags = ATA_FLAG_SLAVE_POSS,
 394                         .pio_mask = ATA_PIO4,
 395                         .mwdma_mask = ATA_MWDMA2,
 396                         .port_ops = &cmd646r3_port_ops
 397                 },
 398                 {       /* CMD 646U2 with working UDMA */
 399                         .flags = ATA_FLAG_SLAVE_POSS,
 400                         .pio_mask = ATA_PIO4,
 401                         .mwdma_mask = ATA_MWDMA2,
 402                         .udma_mask = ATA_UDMA2,
 403                         .port_ops = &cmd646r3_port_ops
 404                 },
 405                 {       /* CMD 646 rev 1  */
 406                         .flags = ATA_FLAG_SLAVE_POSS,
 407                         .pio_mask = ATA_PIO4,
 408                         .mwdma_mask = ATA_MWDMA2,
 409                         .port_ops = &cmd646r1_port_ops
 410                 },
 411                 {       /* CMD 648 */
 412                         .flags = ATA_FLAG_SLAVE_POSS,
 413                         .pio_mask = ATA_PIO4,
 414                         .mwdma_mask = ATA_MWDMA2,
 415                         .udma_mask = ATA_UDMA4,
 416                         .port_ops = &cmd648_port_ops
 417                 },
 418                 {       /* CMD 649 */
 419                         .flags = ATA_FLAG_SLAVE_POSS,
 420                         .pio_mask = ATA_PIO4,
 421                         .mwdma_mask = ATA_MWDMA2,
 422                         .udma_mask = ATA_UDMA5,
 423                         .port_ops = &cmd648_port_ops
 424                 }
 425         };
 426         const struct ata_port_info *ppi[] = {
 427                 &cmd_info[id->driver_data],
 428                 &cmd_info[id->driver_data],
 429                 NULL
 430         };
 431         u8 reg;
 432         int rc;
 433         struct pci_dev *bridge = pdev->bus->self;
 434         /* mobility split bridges don't report enabled ports correctly */
 435         int port_ok = !(bridge && bridge->vendor ==
 436                         PCI_VENDOR_ID_MOBILITY_ELECTRONICS);
 437         /* all (with exceptions below) apart from 643 have CNTRL_CH0 bit */
 438         int cntrl_ch0_ok = (id->driver_data != 0);
 439
 440         rc = pcim_enable_device(pdev);
 441         if (rc)
 442                 return rc;
 443
 444         if (id->driver_data == 0)       /* 643 */
 445                 ata_pci_bmdma_clear_simplex(pdev);
 446
 447         if (pdev->device == PCI_DEVICE_ID_CMD_646)
 448                 switch (pdev->revision) {
 449                 /* UDMA works since rev 5 */
 450                 default:
 451                         ppi[0] = &cmd_info[3];
 452                         ppi[1] = &cmd_info[3];
 453                         break;
 454                 /* Interrupts in MRDMODE since rev 3 */
 455                 case 3:
 456                 case 4:
 457                         ppi[0] = &cmd_info[2];
 458                         ppi[1] = &cmd_info[2];
 459                         break;
 460                 /* Rev 1 with other problems? */
 461                 case 1:
 462                         ppi[0] = &cmd_info[4];
 463                         ppi[1] = &cmd_info[4];
 464                         fallthrough;
 465                 /* Early revs have no CNTRL_CH0 */
 466                 case 2:
 467                 case 0:
 468                         cntrl_ch0_ok = 0;
 469                         break;
 470                 }
 471
 472         cmd64x_fixup(pdev);
 473
 474         /* check for enabled ports */
 475         pci_read_config_byte(pdev, CNTRL, &reg);
 476         if (!port_ok)
 477                 dev_notice(&pdev->dev, "Mobility Bridge detected, ignoring CNTRL port enable/disable\n");
 478         if (port_ok && cntrl_ch0_ok && !(reg & CNTRL_CH0)) {
 479                 dev_notice(&pdev->dev, "Primary port is disabled\n");
 480                 ppi[0] = &ata_dummy_port_info;
 481
 482         }
 483         if (port_ok && !(reg & CNTRL_CH1)) {
 484                 dev_notice(&pdev->dev, "Secondary port is disabled\n");
 485                 ppi[1] = &ata_dummy_port_info;
 486         }
 487
 488         return ata_pci_bmdma_init_one(pdev, ppi, &cmd64x_sht, NULL, 0);
 489 }
 490
 491 #ifdef CONFIG_PM_SLEEP
 492 static int cmd64x_reinit_one(struct pci_dev *pdev)
 493 {
 494         struct ata_host *host = pci_get_drvdata(pdev);
 495         int rc;
 496
 497         rc = ata_pci_device_do_resume(pdev);
 498         if (rc)
 499                 return rc;
 500
 501         cmd64x_fixup(pdev);
 502
 503         ata_host_resume(host);
 504         return 0;
 505 }
 506 #endif
 507
 508 static const struct pci_device_id cmd64x[] = {
 509         { PCI_VDEVICE(CMD, PCI_DEVICE_ID_CMD_643), 0 },
 510         { PCI_VDEVICE(CMD, PCI_DEVICE_ID_CMD_646), 1 },
 511         { PCI_VDEVICE(CMD, PCI_DEVICE_ID_CMD_648), 5 },
 512         { PCI_VDEVICE(CMD, PCI_DEVICE_ID_CMD_649), 6 },
 513
 514         { },
 515 };
 516
 517 static struct pci_driver cmd64x_pci_driver = {
 518         .name           = DRV_NAME,
 519         .id_table       = cmd64x,
 520         .probe          = cmd64x_init_one,
 521         .remove         = ata_pci_remove_one,
 522 #ifdef CONFIG_PM_SLEEP
 523         .suspend        = ata_pci_device_suspend,
 524         .resume         = cmd64x_reinit_one,
 525 #endif
 526 };
 527
 528 module_pci_driver(cmd64x_pci_driver);
 529
 530 MODULE_AUTHOR("Alan Cox");
 531 MODULE_DESCRIPTION("low-level driver for CMD64x series PATA controllers");
 532 MODULE_LICENSE("GPL");
 533 MODULE_DEVICE_TABLE(pci, cmd64x);
 534 MODULE_VERSION(DRV_VERSION);