drivers/ata/sata_vsc.c

   1 /*
   2  *  sata_vsc.c - Vitesse VSC7174 4 port DPA SATA
   3  *
   4  *  Maintained by:  Jeremy Higdon @ SGI
   5  *                  Please ALWAYS copy linux-ide@vger.kernel.org
   6  *                  on emails.
   7  *
   8  *  Copyright 2004 SGI
   9  *
  10  *  Bits from Jeff Garzik, Copyright RedHat, Inc.
  11  *
  12  *
  13  *  This program is free software; you can redistribute it and/or modify
  14  *  it under the terms of the GNU General Public License as published by
  15  *  the Free Software Foundation; either version 2, or (at your option)
  16  *  any later version.
  17  *
  18  *  This program is distributed in the hope that it will be useful,
  19  *  but WITHOUT ANY WARRANTY; without even the implied warranty of
  20  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  21  *  GNU General Public License for more details.
  22  *
  23  *  You should have received a copy of the GNU General Public License
  24  *  along with this program; see the file COPYING.  If not, write to
  25  *  the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA.
  26  *
  27  *
  28  *  libata documentation is available via 'make {ps|pdf}docs',
  29  *  as Documentation/DocBook/libata.*
  30  *
  31  *  Vitesse hardware documentation presumably available under NDA.
  32  *  Intel 31244 (same hardware interface) documentation presumably
  33  *  available from http://developer.intel.com/
  34  *
  35  */
  36
  37 #include <linux/kernel.h>
  38 #include <linux/module.h>
  39 #include <linux/pci.h>
  40 #include <linux/init.h>
  41 #include <linux/blkdev.h>
  42 #include <linux/delay.h>
  43 #include <linux/interrupt.h>
  44 #include <linux/dma-mapping.h>
  45 #include <linux/device.h>
  46 #include <scsi/scsi_host.h>
  47 #include <linux/libata.h>
  48
  49 #define DRV_NAME        "sata_vsc"
  50 #define DRV_VERSION     "2.3"
  51
  52 enum {
  53         VSC_MMIO_BAR                    = 0,
  54
  55         /* Interrupt register offsets (from chip base address) */
  56         VSC_SATA_INT_STAT_OFFSET        = 0x00,
  57         VSC_SATA_INT_MASK_OFFSET        = 0x04,
  58
  59         /* Taskfile registers offsets */
  60         VSC_SATA_TF_CMD_OFFSET          = 0x00,
  61         VSC_SATA_TF_DATA_OFFSET         = 0x00,
  62         VSC_SATA_TF_ERROR_OFFSET        = 0x04,
  63         VSC_SATA_TF_FEATURE_OFFSET      = 0x06,
  64         VSC_SATA_TF_NSECT_OFFSET        = 0x08,
  65         VSC_SATA_TF_LBAL_OFFSET         = 0x0c,
  66         VSC_SATA_TF_LBAM_OFFSET         = 0x10,
  67         VSC_SATA_TF_LBAH_OFFSET         = 0x14,
  68         VSC_SATA_TF_DEVICE_OFFSET       = 0x18,
  69         VSC_SATA_TF_STATUS_OFFSET       = 0x1c,
  70         VSC_SATA_TF_COMMAND_OFFSET      = 0x1d,
  71         VSC_SATA_TF_ALTSTATUS_OFFSET    = 0x28,
  72         VSC_SATA_TF_CTL_OFFSET          = 0x29,
  73
  74         /* DMA base */
  75         VSC_SATA_UP_DESCRIPTOR_OFFSET   = 0x64,
  76         VSC_SATA_UP_DATA_BUFFER_OFFSET  = 0x6C,
  77         VSC_SATA_DMA_CMD_OFFSET         = 0x70,
  78
  79         /* SCRs base */
  80         VSC_SATA_SCR_STATUS_OFFSET      = 0x100,
  81         VSC_SATA_SCR_ERROR_OFFSET       = 0x104,
  82         VSC_SATA_SCR_CONTROL_OFFSET     = 0x108,
  83
  84         /* Port stride */
  85         VSC_SATA_PORT_OFFSET            = 0x200,
  86
  87         /* Error interrupt status bit offsets */
  88         VSC_SATA_INT_ERROR_CRC          = 0x40,
  89         VSC_SATA_INT_ERROR_T            = 0x20,
  90         VSC_SATA_INT_ERROR_P            = 0x10,
  91         VSC_SATA_INT_ERROR_R            = 0x8,
  92         VSC_SATA_INT_ERROR_E            = 0x4,
  93         VSC_SATA_INT_ERROR_M            = 0x2,
  94         VSC_SATA_INT_PHY_CHANGE         = 0x1,
  95         VSC_SATA_INT_ERROR = (VSC_SATA_INT_ERROR_CRC  | VSC_SATA_INT_ERROR_T | \
  96                               VSC_SATA_INT_ERROR_P    | VSC_SATA_INT_ERROR_R | \
  97                               VSC_SATA_INT_ERROR_E    | VSC_SATA_INT_ERROR_M | \
  98                               VSC_SATA_INT_PHY_CHANGE),
  99 };
 100
 101 static int vsc_sata_scr_read(struct ata_link *link,
 102                              unsigned int sc_reg, u32 *val)
 103 {
 104         if (sc_reg > SCR_CONTROL)
 105                 return -EINVAL;
 106         *val = readl(link->ap->ioaddr.scr_addr + (sc_reg * 4));
 107         return 0;
 108 }
 109
 110
 111 static int vsc_sata_scr_write(struct ata_link *link,
 112                               unsigned int sc_reg, u32 val)
 113 {
 114         if (sc_reg > SCR_CONTROL)
 115                 return -EINVAL;
 116         writel(val, link->ap->ioaddr.scr_addr + (sc_reg * 4));
 117         return 0;
 118 }
 119
 120
 121 static void vsc_freeze(struct ata_port *ap)
 122 {
 123         void __iomem *mask_addr;
 124
 125         mask_addr = ap->host->iomap[VSC_MMIO_BAR] +
 126                 VSC_SATA_INT_MASK_OFFSET + ap->port_no;
 127
 128         writeb(0, mask_addr);
 129 }
 130
 131
 132 static void vsc_thaw(struct ata_port *ap)
 133 {
 134         void __iomem *mask_addr;
 135
 136         mask_addr = ap->host->iomap[VSC_MMIO_BAR] +
 137                 VSC_SATA_INT_MASK_OFFSET + ap->port_no;
 138
 139         writeb(0xff, mask_addr);
 140 }
 141
 142
 143 static void vsc_intr_mask_update(struct ata_port *ap, u8 ctl)
 144 {
 145         void __iomem *mask_addr;
 146         u8 mask;
 147
 148         mask_addr = ap->host->iomap[VSC_MMIO_BAR] +
 149                 VSC_SATA_INT_MASK_OFFSET + ap->port_no;
 150         mask = readb(mask_addr);
 151         if (ctl & ATA_NIEN)
 152                 mask |= 0x80;
 153         else
 154                 mask &= 0x7F;
 155         writeb(mask, mask_addr);
 156 }
 157
 158
 159 static void vsc_sata_tf_load(struct ata_port *ap, const struct ata_taskfile *tf)
 160 {
 161         struct ata_ioports *ioaddr = &ap->ioaddr;
 162         unsigned int is_addr = tf->flags & ATA_TFLAG_ISADDR;
 163
 164         /*
 165          * The only thing the ctl register is used for is SRST.
 166          * That is not enabled or disabled via tf_load.
 167          * However, if ATA_NIEN is changed, then we need to change
 168          * the interrupt register.
 169          */
 170         if ((tf->ctl & ATA_NIEN) != (ap->last_ctl & ATA_NIEN)) {
 171                 ap->last_ctl = tf->ctl;
 172                 vsc_intr_mask_update(ap, tf->ctl & ATA_NIEN);
 173         }
 174         if (is_addr && (tf->flags & ATA_TFLAG_LBA48)) {
 175                 writew(tf->feature | (((u16)tf->hob_feature) << 8),
 176                        ioaddr->feature_addr);
 177                 writew(tf->nsect | (((u16)tf->hob_nsect) << 8),
 178                        ioaddr->nsect_addr);
 179                 writew(tf->lbal | (((u16)tf->hob_lbal) << 8),
 180                        ioaddr->lbal_addr);
 181                 writew(tf->lbam | (((u16)tf->hob_lbam) << 8),
 182                        ioaddr->lbam_addr);
 183                 writew(tf->lbah | (((u16)tf->hob_lbah) << 8),
 184                        ioaddr->lbah_addr);
 185         } else if (is_addr) {
 186                 writew(tf->feature, ioaddr->feature_addr);
 187                 writew(tf->nsect, ioaddr->nsect_addr);
 188                 writew(tf->lbal, ioaddr->lbal_addr);
 189                 writew(tf->lbam, ioaddr->lbam_addr);
 190                 writew(tf->lbah, ioaddr->lbah_addr);
 191         }
 192
 193         if (tf->flags & ATA_TFLAG_DEVICE)
 194                 writeb(tf->device, ioaddr->device_addr);
 195
 196         ata_wait_idle(ap);
 197 }
 198
 199
 200 static void vsc_sata_tf_read(struct ata_port *ap, struct ata_taskfile *tf)
 201 {
 202         struct ata_ioports *ioaddr = &ap->ioaddr;
 203         u16 nsect, lbal, lbam, lbah, feature;
 204
 205         tf->command = ata_sff_check_status(ap);
 206         tf->device = readw(ioaddr->device_addr);
 207         feature = readw(ioaddr->error_addr);
 208         nsect = readw(ioaddr->nsect_addr);
 209         lbal = readw(ioaddr->lbal_addr);
 210         lbam = readw(ioaddr->lbam_addr);
 211         lbah = readw(ioaddr->lbah_addr);
 212
 213         tf->feature = feature;
 214         tf->nsect = nsect;
 215         tf->lbal = lbal;
 216         tf->lbam = lbam;
 217         tf->lbah = lbah;
 218
 219         if (tf->flags & ATA_TFLAG_LBA48) {
 220                 tf->hob_feature = feature >> 8;
 221                 tf->hob_nsect = nsect >> 8;
 222                 tf->hob_lbal = lbal >> 8;
 223                 tf->hob_lbam = lbam >> 8;
 224                 tf->hob_lbah = lbah >> 8;
 225         }
 226 }
 227
 228 static inline void vsc_error_intr(u8 port_status, struct ata_port *ap)
 229 {
 230         if (port_status & (VSC_SATA_INT_PHY_CHANGE | VSC_SATA_INT_ERROR_M))
 231                 ata_port_freeze(ap);
 232         else
 233                 ata_port_abort(ap);
 234 }
 235
 236 static void vsc_port_intr(u8 port_status, struct ata_port *ap)
 237 {
 238         struct ata_queued_cmd *qc;
 239         int handled = 0;
 240
 241         if (unlikely(port_status & VSC_SATA_INT_ERROR)) {
 242                 vsc_error_intr(port_status, ap);
 243                 return;
 244         }
 245
 246         qc = ata_qc_from_tag(ap, ap->link.active_tag);
 247         if (qc && likely(!(qc->tf.flags & ATA_TFLAG_POLLING)))
 248                 handled = ata_sff_host_intr(ap, qc);
 249
 250         /* We received an interrupt during a polled command,
 251          * or some other spurious condition.  Interrupt reporting
 252          * with this hardware is fairly reliable so it is safe to
 253          * simply clear the interrupt
 254          */
 255         if (unlikely(!handled))
 256                 ap->ops->sff_check_status(ap);
 257 }
 258
 259 /*
 260  * vsc_sata_interrupt
 261  *
 262  * Read the interrupt register and process for the devices that have
 263  * them pending.
 264  */
 265 static irqreturn_t vsc_sata_interrupt(int irq, void *dev_instance)
 266 {
 267         struct ata_host *host = dev_instance;
 268         unsigned int i;
 269         unsigned int handled = 0;
 270         u32 status;
 271
 272         status = readl(host->iomap[VSC_MMIO_BAR] + VSC_SATA_INT_STAT_OFFSET);
 273
 274         if (unlikely(status == 0xffffffff || status == 0)) {
 275                 if (status)
 276                         dev_printk(KERN_ERR, host->dev,
 277                                 ": IRQ status == 0xffffffff, "
 278                                 "PCI fault or device removal?\n");
 279                 goto out;
 280         }
 281
 282         spin_lock(&host->lock);
 283
 284         for (i = 0; i < host->n_ports; i++) {
 285                 u8 port_status = (status >> (8 * i)) & 0xff;
 286                 if (port_status) {
 287                         struct ata_port *ap = host->ports[i];
 288
 289                         if (ap && !(ap->flags & ATA_FLAG_DISABLED)) {
 290                                 vsc_port_intr(port_status, ap);
 291                                 handled++;
 292                         } else
 293                                 dev_printk(KERN_ERR, host->dev,
 294                                         "interrupt from disabled port %d\n", i);
 295                 }
 296         }
 297
 298         spin_unlock(&host->lock);
 299 out:
 300         return IRQ_RETVAL(handled);
 301 }
 302
 303
 304 static struct scsi_host_template vsc_sata_sht = {
 305         ATA_BMDMA_SHT(DRV_NAME),
 306 };
 307
 308
 309 static struct ata_port_operations vsc_sata_ops = {
 310         .inherits               = &ata_bmdma_port_ops,
 311         /* The IRQ handling is not quite standard SFF behaviour so we
 312            cannot use the default lost interrupt handler */
 313         .lost_interrupt         = ATA_OP_NULL,
 314         .sff_tf_load            = vsc_sata_tf_load,
 315         .sff_tf_read            = vsc_sata_tf_read,
 316         .freeze                 = vsc_freeze,
 317         .thaw                   = vsc_thaw,
 318         .scr_read               = vsc_sata_scr_read,
 319         .scr_write              = vsc_sata_scr_write,
 320 };
 321
 322 static void __devinit vsc_sata_setup_port(struct ata_ioports *port,
 323                                           void __iomem *base)
 324 {
 325         port->cmd_addr          = base + VSC_SATA_TF_CMD_OFFSET;
 326         port->data_addr         = base + VSC_SATA_TF_DATA_OFFSET;
 327         port->error_addr        = base + VSC_SATA_TF_ERROR_OFFSET;
 328         port->feature_addr      = base + VSC_SATA_TF_FEATURE_OFFSET;
 329         port->nsect_addr        = base + VSC_SATA_TF_NSECT_OFFSET;
 330         port->lbal_addr         = base + VSC_SATA_TF_LBAL_OFFSET;
 331         port->lbam_addr         = base + VSC_SATA_TF_LBAM_OFFSET;
 332         port->lbah_addr         = base + VSC_SATA_TF_LBAH_OFFSET;
 333         port->device_addr       = base + VSC_SATA_TF_DEVICE_OFFSET;
 334         port->status_addr       = base + VSC_SATA_TF_STATUS_OFFSET;
 335         port->command_addr      = base + VSC_SATA_TF_COMMAND_OFFSET;
 336         port->altstatus_addr    = base + VSC_SATA_TF_ALTSTATUS_OFFSET;
 337         port->ctl_addr          = base + VSC_SATA_TF_CTL_OFFSET;
 338         port->bmdma_addr        = base + VSC_SATA_DMA_CMD_OFFSET;
 339         port->scr_addr          = base + VSC_SATA_SCR_STATUS_OFFSET;
 340         writel(0, base + VSC_SATA_UP_DESCRIPTOR_OFFSET);
 341         writel(0, base + VSC_SATA_UP_DATA_BUFFER_OFFSET);
 342 }
 343
 344
 345 static int __devinit vsc_sata_init_one(struct pci_dev *pdev,
 346                                        const struct pci_device_id *ent)
 347 {
 348         static const struct ata_port_info pi = {
 349                 .flags          = ATA_FLAG_SATA | ATA_FLAG_NO_LEGACY |
 350                                   ATA_FLAG_MMIO,
 351                 .pio_mask       = ATA_PIO4,
 352                 .mwdma_mask     = ATA_MWDMA2,
 353                 .udma_mask      = ATA_UDMA6,
 354                 .port_ops       = &vsc_sata_ops,
 355         };
 356         const struct ata_port_info *ppi[] = { &pi, NULL };
 357         static int printed_version;
 358         struct ata_host *host;
 359         void __iomem *mmio_base;
 360         int i, rc;
 361         u8 cls;
 362
 363         if (!printed_version++)
 364                 dev_printk(KERN_DEBUG, &pdev->dev, "version " DRV_VERSION "\n");
 365
 366         /* allocate host */
 367         host = ata_host_alloc_pinfo(&pdev->dev, ppi, 4);
 368         if (!host)
 369                 return -ENOMEM;
 370
 371         rc = pcim_enable_device(pdev);
 372         if (rc)
 373                 return rc;
 374
 375         /* check if we have needed resource mapped */
 376         if (pci_resource_len(pdev, 0) == 0)
 377                 return -ENODEV;
 378
 379         /* map IO regions and intialize host accordingly */
 380         rc = pcim_iomap_regions(pdev, 1 << VSC_MMIO_BAR, DRV_NAME);
 381         if (rc == -EBUSY)
 382                 pcim_pin_device(pdev);
 383         if (rc)
 384                 return rc;
 385         host->iomap = pcim_iomap_table(pdev);
 386
 387         mmio_base = host->iomap[VSC_MMIO_BAR];
 388
 389         for (i = 0; i < host->n_ports; i++) {
 390                 struct ata_port *ap = host->ports[i];
 391                 unsigned int offset = (i + 1) * VSC_SATA_PORT_OFFSET;
 392
 393                 vsc_sata_setup_port(&ap->ioaddr, mmio_base + offset);
 394
 395                 ata_port_pbar_desc(ap, VSC_MMIO_BAR, -1, "mmio");
 396                 ata_port_pbar_desc(ap, VSC_MMIO_BAR, offset, "port");
 397         }
 398
 399         /*
 400          * Use 32 bit DMA mask, because 64 bit address support is poor.
 401          */
 402         rc = pci_set_dma_mask(pdev, DMA_BIT_MASK(32));
 403         if (rc)
 404                 return rc;
 405         rc = pci_set_consistent_dma_mask(pdev, DMA_BIT_MASK(32));
 406         if (rc)
 407                 return rc;
 408
 409         /*
 410          * Due to a bug in the chip, the default cache line size can't be
 411          * used (unless the default is non-zero).
 412          */
 413         pci_read_config_byte(pdev, PCI_CACHE_LINE_SIZE, &cls);
 414         if (cls == 0x00)
 415                 pci_write_config_byte(pdev, PCI_CACHE_LINE_SIZE, 0x80);
 416
 417         if (pci_enable_msi(pdev) == 0)
 418                 pci_intx(pdev, 0);
 419
 420         /*
 421          * Config offset 0x98 is "Extended Control and Status Register 0"
 422          * Default value is (1 << 28).  All bits except bit 28 are reserved in
 423          * DPA mode.  If bit 28 is set, LED 0 reflects all ports' activity.
 424          * If bit 28 is clear, each port has its own LED.
 425          */
 426         pci_write_config_dword(pdev, 0x98, 0);
 427
 428         pci_set_master(pdev);
 429         return ata_host_activate(host, pdev->irq, vsc_sata_interrupt,
 430                                  IRQF_SHARED, &vsc_sata_sht);
 431 }
 432
 433 static const struct pci_device_id vsc_sata_pci_tbl[] = {
 434         { PCI_VENDOR_ID_VITESSE, 0x7174,
 435           PCI_ANY_ID, PCI_ANY_ID, 0x10600, 0xFFFFFF, 0 },
 436         { PCI_VENDOR_ID_INTEL, 0x3200,
 437           PCI_ANY_ID, PCI_ANY_ID, 0x10600, 0xFFFFFF, 0 },
 438
 439         { }     /* terminate list */
 440 };
 441
 442 static struct pci_driver vsc_sata_pci_driver = {
 443         .name                   = DRV_NAME,
 444         .id_table               = vsc_sata_pci_tbl,
 445         .probe                  = vsc_sata_init_one,
 446         .remove                 = ata_pci_remove_one,
 447 };
 448
 449 static int __init vsc_sata_init(void)
 450 {
 451         return pci_register_driver(&vsc_sata_pci_driver);
 452 }
 453
 454 static void __exit vsc_sata_exit(void)
 455 {
 456         pci_unregister_driver(&vsc_sata_pci_driver);
 457 }
 458
 459 MODULE_AUTHOR("Jeremy Higdon");
 460 MODULE_DESCRIPTION("low-level driver for Vitesse VSC7174 SATA controller");
 461 MODULE_LICENSE("GPL");
 462 MODULE_DEVICE_TABLE(pci, vsc_sata_pci_tbl);
 463 MODULE_VERSION(DRV_VERSION);
 464
 465 module_init(vsc_sata_init);
 466 module_exit(vsc_sata_exit);