drivers/ata/sata_svw.c

   1 /*
   2  *  sata_svw.c - ServerWorks / Apple K2 SATA
   3  *
   4  *  Maintained by: Benjamin Herrenschmidt <benh@kernel.crashing.org> and
   5  *                 Jeff Garzik <jgarzik@pobox.com>
   6  *                  Please ALWAYS copy linux-ide@vger.kernel.org
   7  *                  on emails.
   8  *
   9  *  Copyright 2003 Benjamin Herrenschmidt <benh@kernel.crashing.org>
  10  *
  11  *  Bits from Jeff Garzik, Copyright RedHat, Inc.
  12  *
  13  *  This driver probably works with non-Apple versions of the
  14  *  Broadcom chipset...
  15  *
  16  *
  17  *  This program is free software; you can redistribute it and/or modify
  18  *  it under the terms of the GNU General Public License as published by
  19  *  the Free Software Foundation; either version 2, or (at your option)
  20  *  any later version.
  21  *
  22  *  This program is distributed in the hope that it will be useful,
  23  *  but WITHOUT ANY WARRANTY; without even the implied warranty of
  24  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  25  *  GNU General Public License for more details.
  26  *
  27  *  You should have received a copy of the GNU General Public License
  28  *  along with this program; see the file COPYING.  If not, write to
  29  *  the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA.
  30  *
  31  *
  32  *  libata documentation is available via 'make {ps|pdf}docs',
  33  *  as Documentation/DocBook/libata.*
  34  *
  35  *  Hardware documentation available under NDA.
  36  *
  37  */
  38
  39 #include <linux/kernel.h>
  40 #include <linux/module.h>
  41 #include <linux/pci.h>
  42 #include <linux/init.h>
  43 #include <linux/blkdev.h>
  44 #include <linux/delay.h>
  45 #include <linux/interrupt.h>
  46 #include <linux/device.h>
  47 #include <scsi/scsi_host.h>
  48 #include <scsi/scsi_cmnd.h>
  49 #include <scsi/scsi.h>
  50 #include <linux/libata.h>
  51
  52 #ifdef CONFIG_PPC_OF
  53 #include <asm/prom.h>
  54 #include <asm/pci-bridge.h>
  55 #endif /* CONFIG_PPC_OF */
  56
  57 #define DRV_NAME        "sata_svw"
  58 #define DRV_VERSION     "2.3"
  59
  60 enum {
  61         /* ap->flags bits */
  62         K2_FLAG_SATA_8_PORTS            = (1 << 24),
  63         K2_FLAG_NO_ATAPI_DMA            = (1 << 25),
  64         K2_FLAG_BAR_POS_3                       = (1 << 26),
  65
  66         /* Taskfile registers offsets */
  67         K2_SATA_TF_CMD_OFFSET           = 0x00,
  68         K2_SATA_TF_DATA_OFFSET          = 0x00,
  69         K2_SATA_TF_ERROR_OFFSET         = 0x04,
  70         K2_SATA_TF_NSECT_OFFSET         = 0x08,
  71         K2_SATA_TF_LBAL_OFFSET          = 0x0c,
  72         K2_SATA_TF_LBAM_OFFSET          = 0x10,
  73         K2_SATA_TF_LBAH_OFFSET          = 0x14,
  74         K2_SATA_TF_DEVICE_OFFSET        = 0x18,
  75         K2_SATA_TF_CMDSTAT_OFFSET       = 0x1c,
  76         K2_SATA_TF_CTL_OFFSET           = 0x20,
  77
  78         /* DMA base */
  79         K2_SATA_DMA_CMD_OFFSET          = 0x30,
  80
  81         /* SCRs base */
  82         K2_SATA_SCR_STATUS_OFFSET       = 0x40,
  83         K2_SATA_SCR_ERROR_OFFSET        = 0x44,
  84         K2_SATA_SCR_CONTROL_OFFSET      = 0x48,
  85
  86         /* Others */
  87         K2_SATA_SICR1_OFFSET            = 0x80,
  88         K2_SATA_SICR2_OFFSET            = 0x84,
  89         K2_SATA_SIM_OFFSET              = 0x88,
  90
  91         /* Port stride */
  92         K2_SATA_PORT_OFFSET             = 0x100,
  93
  94         chip_svw4                       = 0,
  95         chip_svw8                       = 1,
  96         chip_svw42                      = 2,    /* bar 3 */
  97         chip_svw43                      = 3,    /* bar 5 */
  98 };
  99
 100 static u8 k2_stat_check_status(struct ata_port *ap);
 101
 102
 103 static int k2_sata_check_atapi_dma(struct ata_queued_cmd *qc)
 104 {
 105         u8 cmnd = qc->scsicmd->cmnd[0];
 106
 107         if (qc->ap->flags & K2_FLAG_NO_ATAPI_DMA)
 108                 return -1;      /* ATAPI DMA not supported */
 109         else {
 110                 switch (cmnd) {
 111                 case READ_10:
 112                 case READ_12:
 113                 case READ_16:
 114                 case WRITE_10:
 115                 case WRITE_12:
 116                 case WRITE_16:
 117                         return 0;
 118
 119                 default:
 120                         return -1;
 121                 }
 122
 123         }
 124 }
 125
 126 static int k2_sata_scr_read(struct ata_link *link,
 127                             unsigned int sc_reg, u32 *val)
 128 {
 129         if (sc_reg > SCR_CONTROL)
 130                 return -EINVAL;
 131         *val = readl(link->ap->ioaddr.scr_addr + (sc_reg * 4));
 132         return 0;
 133 }
 134
 135
 136 static int k2_sata_scr_write(struct ata_link *link,
 137                              unsigned int sc_reg, u32 val)
 138 {
 139         if (sc_reg > SCR_CONTROL)
 140                 return -EINVAL;
 141         writel(val, link->ap->ioaddr.scr_addr + (sc_reg * 4));
 142         return 0;
 143 }
 144
 145
 146 static void k2_sata_tf_load(struct ata_port *ap, const struct ata_taskfile *tf)
 147 {
 148         struct ata_ioports *ioaddr = &ap->ioaddr;
 149         unsigned int is_addr = tf->flags & ATA_TFLAG_ISADDR;
 150
 151         if (tf->ctl != ap->last_ctl) {
 152                 writeb(tf->ctl, ioaddr->ctl_addr);
 153                 ap->last_ctl = tf->ctl;
 154                 ata_wait_idle(ap);
 155         }
 156         if (is_addr && (tf->flags & ATA_TFLAG_LBA48)) {
 157                 writew(tf->feature | (((u16)tf->hob_feature) << 8),
 158                        ioaddr->feature_addr);
 159                 writew(tf->nsect | (((u16)tf->hob_nsect) << 8),
 160                        ioaddr->nsect_addr);
 161                 writew(tf->lbal | (((u16)tf->hob_lbal) << 8),
 162                        ioaddr->lbal_addr);
 163                 writew(tf->lbam | (((u16)tf->hob_lbam) << 8),
 164                        ioaddr->lbam_addr);
 165                 writew(tf->lbah | (((u16)tf->hob_lbah) << 8),
 166                        ioaddr->lbah_addr);
 167         } else if (is_addr) {
 168                 writew(tf->feature, ioaddr->feature_addr);
 169                 writew(tf->nsect, ioaddr->nsect_addr);
 170                 writew(tf->lbal, ioaddr->lbal_addr);
 171                 writew(tf->lbam, ioaddr->lbam_addr);
 172                 writew(tf->lbah, ioaddr->lbah_addr);
 173         }
 174
 175         if (tf->flags & ATA_TFLAG_DEVICE)
 176                 writeb(tf->device, ioaddr->device_addr);
 177
 178         ata_wait_idle(ap);
 179 }
 180
 181
 182 static void k2_sata_tf_read(struct ata_port *ap, struct ata_taskfile *tf)
 183 {
 184         struct ata_ioports *ioaddr = &ap->ioaddr;
 185         u16 nsect, lbal, lbam, lbah, feature;
 186
 187         tf->command = k2_stat_check_status(ap);
 188         tf->device = readw(ioaddr->device_addr);
 189         feature = readw(ioaddr->error_addr);
 190         nsect = readw(ioaddr->nsect_addr);
 191         lbal = readw(ioaddr->lbal_addr);
 192         lbam = readw(ioaddr->lbam_addr);
 193         lbah = readw(ioaddr->lbah_addr);
 194
 195         tf->feature = feature;
 196         tf->nsect = nsect;
 197         tf->lbal = lbal;
 198         tf->lbam = lbam;
 199         tf->lbah = lbah;
 200
 201         if (tf->flags & ATA_TFLAG_LBA48) {
 202                 tf->hob_feature = feature >> 8;
 203                 tf->hob_nsect = nsect >> 8;
 204                 tf->hob_lbal = lbal >> 8;
 205                 tf->hob_lbam = lbam >> 8;
 206                 tf->hob_lbah = lbah >> 8;
 207         }
 208 }
 209
 210 /**
 211  *      k2_bmdma_setup_mmio - Set up PCI IDE BMDMA transaction (MMIO)
 212  *      @qc: Info associated with this ATA transaction.
 213  *
 214  *      LOCKING:
 215  *      spin_lock_irqsave(host lock)
 216  */
 217
 218 static void k2_bmdma_setup_mmio(struct ata_queued_cmd *qc)
 219 {
 220         struct ata_port *ap = qc->ap;
 221         unsigned int rw = (qc->tf.flags & ATA_TFLAG_WRITE);
 222         u8 dmactl;
 223         void __iomem *mmio = ap->ioaddr.bmdma_addr;
 224
 225         /* load PRD table addr. */
 226         mb();   /* make sure PRD table writes are visible to controller */
 227         writel(ap->bmdma_prd_dma, mmio + ATA_DMA_TABLE_OFS);
 228
 229         /* specify data direction, triple-check start bit is clear */
 230         dmactl = readb(mmio + ATA_DMA_CMD);
 231         dmactl &= ~(ATA_DMA_WR | ATA_DMA_START);
 232         if (!rw)
 233                 dmactl |= ATA_DMA_WR;
 234         writeb(dmactl, mmio + ATA_DMA_CMD);
 235
 236         /* issue r/w command if this is not a ATA DMA command*/
 237         if (qc->tf.protocol != ATA_PROT_DMA)
 238                 ap->ops->sff_exec_command(ap, &qc->tf);
 239 }
 240
 241 /**
 242  *      k2_bmdma_start_mmio - Start a PCI IDE BMDMA transaction (MMIO)
 243  *      @qc: Info associated with this ATA transaction.
 244  *
 245  *      LOCKING:
 246  *      spin_lock_irqsave(host lock)
 247  */
 248
 249 static void k2_bmdma_start_mmio(struct ata_queued_cmd *qc)
 250 {
 251         struct ata_port *ap = qc->ap;
 252         void __iomem *mmio = ap->ioaddr.bmdma_addr;
 253         u8 dmactl;
 254
 255         /* start host DMA transaction */
 256         dmactl = readb(mmio + ATA_DMA_CMD);
 257         writeb(dmactl | ATA_DMA_START, mmio + ATA_DMA_CMD);
 258         /* This works around possible data corruption.
 259
 260            On certain SATA controllers that can be seen when the r/w
 261            command is given to the controller before the host DMA is
 262            started.
 263
 264            On a Read command, the controller would initiate the
 265            command to the drive even before it sees the DMA
 266            start. When there are very fast drives connected to the
 267            controller, or when the data request hits in the drive
 268            cache, there is the possibility that the drive returns a
 269            part or all of the requested data to the controller before
 270            the DMA start is issued.  In this case, the controller
 271            would become confused as to what to do with the data.  In
 272            the worst case when all the data is returned back to the
 273            controller, the controller could hang. In other cases it
 274            could return partial data returning in data
 275            corruption. This problem has been seen in PPC systems and
 276            can also appear on an system with very fast disks, where
 277            the SATA controller is sitting behind a number of bridges,
 278            and hence there is significant latency between the r/w
 279            command and the start command. */
 280         /* issue r/w command if the access is to ATA */
 281         if (qc->tf.protocol == ATA_PROT_DMA)
 282                 ap->ops->sff_exec_command(ap, &qc->tf);
 283 }
 284
 285
 286 static u8 k2_stat_check_status(struct ata_port *ap)
 287 {
 288         return readl(ap->ioaddr.status_addr);
 289 }
 290
 291 #ifdef CONFIG_PPC_OF
 292 /*
 293  * k2_sata_proc_info
 294  * inout : decides on the direction of the dataflow and the meaning of the
 295  *         variables
 296  * buffer: If inout==FALSE data is being written to it else read from it
 297  * *start: If inout==FALSE start of the valid data in the buffer
 298  * offset: If inout==FALSE offset from the beginning of the imaginary file
 299  *         from which we start writing into the buffer
 300  * length: If inout==FALSE max number of bytes to be written into the buffer
 301  *         else number of bytes in the buffer
 302  */
 303 static int k2_sata_proc_info(struct Scsi_Host *shost, char *page, char **start,
 304                              off_t offset, int count, int inout)
 305 {
 306         struct ata_port *ap;
 307         struct device_node *np;
 308         int len, index;
 309
 310         /* Find  the ata_port */
 311         ap = ata_shost_to_port(shost);
 312         if (ap == NULL)
 313                 return 0;
 314
 315         /* Find the OF node for the PCI device proper */
 316         np = pci_device_to_OF_node(to_pci_dev(ap->host->dev));
 317         if (np == NULL)
 318                 return 0;
 319
 320         /* Match it to a port node */
 321         index = (ap == ap->host->ports[0]) ? 0 : 1;
 322         for (np = np->child; np != NULL; np = np->sibling) {
 323                 const u32 *reg = of_get_property(np, "reg", NULL);
 324                 if (!reg)
 325                         continue;
 326                 if (index == *reg)
 327                         break;
 328         }
 329         if (np == NULL)
 330                 return 0;
 331
 332         len = sprintf(page, "devspec: %s\n", np->full_name);
 333
 334         return len;
 335 }
 336 #endif /* CONFIG_PPC_OF */
 337
 338
 339 static struct scsi_host_template k2_sata_sht = {
 340         ATA_BMDMA_SHT(DRV_NAME),
 341 #ifdef CONFIG_PPC_OF
 342         .proc_info              = k2_sata_proc_info,
 343 #endif
 344 };
 345
 346
 347 static struct ata_port_operations k2_sata_ops = {
 348         .inherits               = &ata_bmdma_port_ops,
 349         .sff_tf_load            = k2_sata_tf_load,
 350         .sff_tf_read            = k2_sata_tf_read,
 351         .sff_check_status       = k2_stat_check_status,
 352         .check_atapi_dma        = k2_sata_check_atapi_dma,
 353         .bmdma_setup            = k2_bmdma_setup_mmio,
 354         .bmdma_start            = k2_bmdma_start_mmio,
 355         .scr_read               = k2_sata_scr_read,
 356         .scr_write              = k2_sata_scr_write,
 357 };
 358
 359 static const struct ata_port_info k2_port_info[] = {
 360         /* chip_svw4 */
 361         {
 362                 .flags          = ATA_FLAG_SATA | K2_FLAG_NO_ATAPI_DMA,
 363                 .pio_mask       = ATA_PIO4,
 364                 .mwdma_mask     = ATA_MWDMA2,
 365                 .udma_mask      = ATA_UDMA6,
 366                 .port_ops       = &k2_sata_ops,
 367         },
 368         /* chip_svw8 */
 369         {
 370                 .flags          = ATA_FLAG_SATA | K2_FLAG_NO_ATAPI_DMA |
 371                                   K2_FLAG_SATA_8_PORTS,
 372                 .pio_mask       = ATA_PIO4,
 373                 .mwdma_mask     = ATA_MWDMA2,
 374                 .udma_mask      = ATA_UDMA6,
 375                 .port_ops       = &k2_sata_ops,
 376         },
 377         /* chip_svw42 */
 378         {
 379                 .flags          = ATA_FLAG_SATA | K2_FLAG_BAR_POS_3,
 380                 .pio_mask       = ATA_PIO4,
 381                 .mwdma_mask     = ATA_MWDMA2,
 382                 .udma_mask      = ATA_UDMA6,
 383                 .port_ops       = &k2_sata_ops,
 384         },
 385         /* chip_svw43 */
 386         {
 387                 .flags          = ATA_FLAG_SATA,
 388                 .pio_mask       = ATA_PIO4,
 389                 .mwdma_mask     = ATA_MWDMA2,
 390                 .udma_mask      = ATA_UDMA6,
 391                 .port_ops       = &k2_sata_ops,
 392         },
 393 };
 394
 395 static void k2_sata_setup_port(struct ata_ioports *port, void __iomem *base)
 396 {
 397         port->cmd_addr          = base + K2_SATA_TF_CMD_OFFSET;
 398         port->data_addr         = base + K2_SATA_TF_DATA_OFFSET;
 399         port->feature_addr      =
 400         port->error_addr        = base + K2_SATA_TF_ERROR_OFFSET;
 401         port->nsect_addr        = base + K2_SATA_TF_NSECT_OFFSET;
 402         port->lbal_addr         = base + K2_SATA_TF_LBAL_OFFSET;
 403         port->lbam_addr         = base + K2_SATA_TF_LBAM_OFFSET;
 404         port->lbah_addr         = base + K2_SATA_TF_LBAH_OFFSET;
 405         port->device_addr       = base + K2_SATA_TF_DEVICE_OFFSET;
 406         port->command_addr      =
 407         port->status_addr       = base + K2_SATA_TF_CMDSTAT_OFFSET;
 408         port->altstatus_addr    =
 409         port->ctl_addr          = base + K2_SATA_TF_CTL_OFFSET;
 410         port->bmdma_addr        = base + K2_SATA_DMA_CMD_OFFSET;
 411         port->scr_addr          = base + K2_SATA_SCR_STATUS_OFFSET;
 412 }
 413
 414
 415 static int k2_sata_init_one(struct pci_dev *pdev, const struct pci_device_id *ent)
 416 {
 417         const struct ata_port_info *ppi[] =
 418                 { &k2_port_info[ent->driver_data], NULL };
 419         struct ata_host *host;
 420         void __iomem *mmio_base;
 421         int n_ports, i, rc, bar_pos;
 422
 423         ata_print_version_once(&pdev->dev, DRV_VERSION);
 424
 425         /* allocate host */
 426         n_ports = 4;
 427         if (ppi[0]->flags & K2_FLAG_SATA_8_PORTS)
 428                 n_ports = 8;
 429
 430         host = ata_host_alloc_pinfo(&pdev->dev, ppi, n_ports);
 431         if (!host)
 432                 return -ENOMEM;
 433
 434         bar_pos = 5;
 435         if (ppi[0]->flags & K2_FLAG_BAR_POS_3)
 436                 bar_pos = 3;
 437         /*
 438          * If this driver happens to only be useful on Apple's K2, then
 439          * we should check that here as it has a normal Serverworks ID
 440          */
 441         rc = pcim_enable_device(pdev);
 442         if (rc)
 443                 return rc;
 444
 445         /*
 446          * Check if we have resources mapped at all (second function may
 447          * have been disabled by firmware)
 448          */
 449         if (pci_resource_len(pdev, bar_pos) == 0) {
 450                 /* In IDE mode we need to pin the device to ensure that
 451                         pcim_release does not clear the busmaster bit in config
 452                         space, clearing causes busmaster DMA to fail on
 453                         ports 3 & 4 */
 454                 pcim_pin_device(pdev);
 455                 return -ENODEV;
 456         }
 457
 458         /* Request and iomap PCI regions */
 459         rc = pcim_iomap_regions(pdev, 1 << bar_pos, DRV_NAME);
 460         if (rc == -EBUSY)
 461                 pcim_pin_device(pdev);
 462         if (rc)
 463                 return rc;
 464         host->iomap = pcim_iomap_table(pdev);
 465         mmio_base = host->iomap[bar_pos];
 466
 467         /* different controllers have different number of ports - currently 4 or 8 */
 468         /* All ports are on the same function. Multi-function device is no
 469          * longer available. This should not be seen in any system. */
 470         for (i = 0; i < host->n_ports; i++) {
 471                 struct ata_port *ap = host->ports[i];
 472                 unsigned int offset = i * K2_SATA_PORT_OFFSET;
 473
 474                 k2_sata_setup_port(&ap->ioaddr, mmio_base + offset);
 475
 476                 ata_port_pbar_desc(ap, 5, -1, "mmio");
 477                 ata_port_pbar_desc(ap, 5, offset, "port");
 478         }
 479
 480         rc = pci_set_dma_mask(pdev, ATA_DMA_MASK);
 481         if (rc)
 482                 return rc;
 483         rc = pci_set_consistent_dma_mask(pdev, ATA_DMA_MASK);
 484         if (rc)
 485                 return rc;
 486
 487         /* Clear a magic bit in SCR1 according to Darwin, those help
 488          * some funky seagate drives (though so far, those were already
 489          * set by the firmware on the machines I had access to)
 490          */
 491         writel(readl(mmio_base + K2_SATA_SICR1_OFFSET) & ~0x00040000,
 492                mmio_base + K2_SATA_SICR1_OFFSET);
 493
 494         /* Clear SATA error & interrupts we don't use */
 495         writel(0xffffffff, mmio_base + K2_SATA_SCR_ERROR_OFFSET);
 496         writel(0x0, mmio_base + K2_SATA_SIM_OFFSET);
 497
 498         pci_set_master(pdev);
 499         return ata_host_activate(host, pdev->irq, ata_bmdma_interrupt,
 500                                  IRQF_SHARED, &k2_sata_sht);
 501 }
 502
 503 /* 0x240 is device ID for Apple K2 device
 504  * 0x241 is device ID for Serverworks Frodo4
 505  * 0x242 is device ID for Serverworks Frodo8
 506  * 0x24a is device ID for BCM5785 (aka HT1000) HT southbridge integrated SATA
 507  * controller
 508  * */
 509 static const struct pci_device_id k2_sata_pci_tbl[] = {
 510         { PCI_VDEVICE(SERVERWORKS, 0x0240), chip_svw4 },
 511         { PCI_VDEVICE(SERVERWORKS, 0x0241), chip_svw8 },
 512         { PCI_VDEVICE(SERVERWORKS, 0x0242), chip_svw4 },
 513         { PCI_VDEVICE(SERVERWORKS, 0x024a), chip_svw4 },
 514         { PCI_VDEVICE(SERVERWORKS, 0x024b), chip_svw4 },
 515         { PCI_VDEVICE(SERVERWORKS, 0x0410), chip_svw42 },
 516         { PCI_VDEVICE(SERVERWORKS, 0x0411), chip_svw43 },
 517
 518         { }
 519 };
 520
 521 static struct pci_driver k2_sata_pci_driver = {
 522         .name                   = DRV_NAME,
 523         .id_table               = k2_sata_pci_tbl,
 524         .probe                  = k2_sata_init_one,
 525         .remove                 = ata_pci_remove_one,
 526 };
 527
 528 static int __init k2_sata_init(void)
 529 {
 530         return pci_register_driver(&k2_sata_pci_driver);
 531 }
 532
 533 static void __exit k2_sata_exit(void)
 534 {
 535         pci_unregister_driver(&k2_sata_pci_driver);
 536 }
 537
 538 MODULE_AUTHOR("Benjamin Herrenschmidt");
 539 MODULE_DESCRIPTION("low-level driver for K2 SATA controller");
 540 MODULE_LICENSE("GPL");
 541 MODULE_DEVICE_TABLE(pci, k2_sata_pci_tbl);
 542 MODULE_VERSION(DRV_VERSION);
 543
 544 module_init(k2_sata_init);
 545 module_exit(k2_sata_exit);