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   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     "2.0"
  51
  52 enum {
  53         /* Interrupt register offsets (from chip base address) */
  54         VSC_SATA_INT_STAT_OFFSET        = 0x00,
  55         VSC_SATA_INT_MASK_OFFSET        = 0x04,
  56
  57         /* Taskfile registers offsets */
  58         VSC_SATA_TF_CMD_OFFSET          = 0x00,
  59         VSC_SATA_TF_DATA_OFFSET         = 0x00,
  60         VSC_SATA_TF_ERROR_OFFSET        = 0x04,
  61         VSC_SATA_TF_FEATURE_OFFSET      = 0x06,
  62         VSC_SATA_TF_NSECT_OFFSET        = 0x08,
  63         VSC_SATA_TF_LBAL_OFFSET         = 0x0c,
  64         VSC_SATA_TF_LBAM_OFFSET         = 0x10,
  65         VSC_SATA_TF_LBAH_OFFSET         = 0x14,
  66         VSC_SATA_TF_DEVICE_OFFSET       = 0x18,
  67         VSC_SATA_TF_STATUS_OFFSET       = 0x1c,
  68         VSC_SATA_TF_COMMAND_OFFSET      = 0x1d,
  69         VSC_SATA_TF_ALTSTATUS_OFFSET    = 0x28,
  70         VSC_SATA_TF_CTL_OFFSET          = 0x29,
  71
  72         /* DMA base */
  73         VSC_SATA_UP_DESCRIPTOR_OFFSET   = 0x64,
  74         VSC_SATA_UP_DATA_BUFFER_OFFSET  = 0x6C,
  75         VSC_SATA_DMA_CMD_OFFSET         = 0x70,
  76
  77         /* SCRs base */
  78         VSC_SATA_SCR_STATUS_OFFSET      = 0x100,
  79         VSC_SATA_SCR_ERROR_OFFSET       = 0x104,
  80         VSC_SATA_SCR_CONTROL_OFFSET     = 0x108,
  81
  82         /* Port stride */
  83         VSC_SATA_PORT_OFFSET            = 0x200,
  84
  85         /* Error interrupt status bit offsets */
  86         VSC_SATA_INT_ERROR_CRC          = 0x40,
  87         VSC_SATA_INT_ERROR_T            = 0x20,
  88         VSC_SATA_INT_ERROR_P            = 0x10,
  89         VSC_SATA_INT_ERROR_R            = 0x8,
  90         VSC_SATA_INT_ERROR_E            = 0x4,
  91         VSC_SATA_INT_ERROR_M            = 0x2,
  92         VSC_SATA_INT_PHY_CHANGE         = 0x1,
  93         VSC_SATA_INT_ERROR = (VSC_SATA_INT_ERROR_CRC  | VSC_SATA_INT_ERROR_T | \
  94                               VSC_SATA_INT_ERROR_P    | VSC_SATA_INT_ERROR_R | \
  95                               VSC_SATA_INT_ERROR_E    | VSC_SATA_INT_ERROR_M | \
  96                               VSC_SATA_INT_PHY_CHANGE),
  97 };
  98
  99 #define is_vsc_sata_int_err(port_idx, int_status) \
 100          (int_status & (VSC_SATA_INT_ERROR << (8 * port_idx)))
 101
 102
 103 static u32 vsc_sata_scr_read (struct ata_port *ap, unsigned int sc_reg)
 104 {
 105         if (sc_reg > SCR_CONTROL)
 106                 return 0xffffffffU;
 107         return readl((void __iomem *) ap->ioaddr.scr_addr + (sc_reg * 4));
 108 }
 109
 110
 111 static void vsc_sata_scr_write (struct ata_port *ap, unsigned int sc_reg,
 112                                u32 val)
 113 {
 114         if (sc_reg > SCR_CONTROL)
 115                 return;
 116         writel(val, (void __iomem *) ap->ioaddr.scr_addr + (sc_reg * 4));
 117 }
 118
 119
 120 static void vsc_intr_mask_update(struct ata_port *ap, u8 ctl)
 121 {
 122         void __iomem *mask_addr;
 123         u8 mask;
 124
 125         mask_addr = ap->host->mmio_base +
 126                 VSC_SATA_INT_MASK_OFFSET + ap->port_no;
 127         mask = readb(mask_addr);
 128         if (ctl & ATA_NIEN)
 129                 mask |= 0x80;
 130         else
 131                 mask &= 0x7F;
 132         writeb(mask, mask_addr);
 133 }
 134
 135
 136 static void vsc_sata_tf_load(struct ata_port *ap, const struct ata_taskfile *tf)
 137 {
 138         struct ata_ioports *ioaddr = &ap->ioaddr;
 139         unsigned int is_addr = tf->flags & ATA_TFLAG_ISADDR;
 140
 141         /*
 142          * The only thing the ctl register is used for is SRST.
 143          * That is not enabled or disabled via tf_load.
 144          * However, if ATA_NIEN is changed, then we need to change the interrupt register.
 145          */
 146         if ((tf->ctl & ATA_NIEN) != (ap->last_ctl & ATA_NIEN)) {
 147                 ap->last_ctl = tf->ctl;
 148                 vsc_intr_mask_update(ap, tf->ctl & ATA_NIEN);
 149         }
 150         if (is_addr && (tf->flags & ATA_TFLAG_LBA48)) {
 151                 writew(tf->feature | (((u16)tf->hob_feature) << 8),
 152                        (void __iomem *) ioaddr->feature_addr);
 153                 writew(tf->nsect | (((u16)tf->hob_nsect) << 8),
 154                        (void __iomem *) ioaddr->nsect_addr);
 155                 writew(tf->lbal | (((u16)tf->hob_lbal) << 8),
 156                        (void __iomem *) ioaddr->lbal_addr);
 157                 writew(tf->lbam | (((u16)tf->hob_lbam) << 8),
 158                        (void __iomem *) ioaddr->lbam_addr);
 159                 writew(tf->lbah | (((u16)tf->hob_lbah) << 8),
 160                        (void __iomem *) ioaddr->lbah_addr);
 161         } else if (is_addr) {
 162                 writew(tf->feature, (void __iomem *) ioaddr->feature_addr);
 163                 writew(tf->nsect, (void __iomem *) ioaddr->nsect_addr);
 164                 writew(tf->lbal, (void __iomem *) ioaddr->lbal_addr);
 165                 writew(tf->lbam, (void __iomem *) ioaddr->lbam_addr);
 166                 writew(tf->lbah, (void __iomem *) ioaddr->lbah_addr);
 167         }
 168
 169         if (tf->flags & ATA_TFLAG_DEVICE)
 170                 writeb(tf->device, (void __iomem *) ioaddr->device_addr);
 171
 172         ata_wait_idle(ap);
 173 }
 174
 175
 176 static void vsc_sata_tf_read(struct ata_port *ap, struct ata_taskfile *tf)
 177 {
 178         struct ata_ioports *ioaddr = &ap->ioaddr;
 179         u16 nsect, lbal, lbam, lbah, feature;
 180
 181         tf->command = ata_check_status(ap);
 182         tf->device = readw((void __iomem *) ioaddr->device_addr);
 183         feature = readw((void __iomem *) ioaddr->error_addr);
 184         nsect = readw((void __iomem *) ioaddr->nsect_addr);
 185         lbal = readw((void __iomem *) ioaddr->lbal_addr);
 186         lbam = readw((void __iomem *) ioaddr->lbam_addr);
 187         lbah = readw((void __iomem *) ioaddr->lbah_addr);
 188
 189         tf->feature = feature;
 190         tf->nsect = nsect;
 191         tf->lbal = lbal;
 192         tf->lbam = lbam;
 193         tf->lbah = lbah;
 194
 195         if (tf->flags & ATA_TFLAG_LBA48) {
 196                 tf->hob_feature = feature >> 8;
 197                 tf->hob_nsect = nsect >> 8;
 198                 tf->hob_lbal = lbal >> 8;
 199                 tf->hob_lbam = lbam >> 8;
 200                 tf->hob_lbah = lbah >> 8;
 201         }
 202 }
 203
 204
 205 /*
 206  * vsc_sata_interrupt
 207  *
 208  * Read the interrupt register and process for the devices that have them pending.
 209  */
 210 static irqreturn_t vsc_sata_interrupt (int irq, void *dev_instance)
 211 {
 212         struct ata_host *host = dev_instance;
 213         unsigned int i;
 214         unsigned int handled = 0;
 215         u32 int_status;
 216
 217         spin_lock(&host->lock);
 218
 219         int_status = readl(host->mmio_base + VSC_SATA_INT_STAT_OFFSET);
 220
 221         for (i = 0; i < host->n_ports; i++) {
 222                 if (int_status & ((u32) 0xFF << (8 * i))) {
 223                         struct ata_port *ap;
 224
 225                         ap = host->ports[i];
 226
 227                         if (is_vsc_sata_int_err(i, int_status)) {
 228                                 u32 err_status;
 229                                 printk(KERN_DEBUG "%s: ignoring interrupt(s)\n", __FUNCTION__);
 230                                 err_status = ap ? vsc_sata_scr_read(ap, SCR_ERROR) : 0;
 231                                 vsc_sata_scr_write(ap, SCR_ERROR, err_status);
 232                                 handled++;
 233                         }
 234
 235                         if (ap && !(ap->flags & ATA_FLAG_DISABLED)) {
 236                                 struct ata_queued_cmd *qc;
 237
 238                                 qc = ata_qc_from_tag(ap, ap->active_tag);
 239                                 if (qc && (!(qc->tf.flags & ATA_TFLAG_POLLING)))
 240                                         handled += ata_host_intr(ap, qc);
 241                                 else if (is_vsc_sata_int_err(i, int_status)) {
 242                                         /*
 243                                          * On some chips (i.e. Intel 31244), an error
 244                                          * interrupt will sneak in at initialization
 245                                          * time (phy state changes).  Clearing the SCR
 246                                          * error register is not required, but it prevents
 247                                          * the phy state change interrupts from recurring
 248                                          * later.
 249                                          */
 250                                         u32 err_status;
 251                                         err_status = vsc_sata_scr_read(ap, SCR_ERROR);
 252                                         printk(KERN_DEBUG "%s: clearing interrupt, "
 253                                                "status %x; sata err status %x\n",
 254                                                __FUNCTION__,
 255                                                int_status, err_status);
 256                                         vsc_sata_scr_write(ap, SCR_ERROR, err_status);
 257                                         /* Clear interrupt status */
 258                                         ata_chk_status(ap);
 259                                         handled++;
 260                                 }
 261                         }
 262                 }
 263         }
 264
 265         spin_unlock(&host->lock);
 266
 267         return IRQ_RETVAL(handled);
 268 }
 269
 270
 271 static struct scsi_host_template vsc_sata_sht = {
 272         .module                 = THIS_MODULE,
 273         .name                   = DRV_NAME,
 274         .ioctl                  = ata_scsi_ioctl,
 275         .queuecommand           = ata_scsi_queuecmd,
 276         .can_queue              = ATA_DEF_QUEUE,
 277         .this_id                = ATA_SHT_THIS_ID,
 278         .sg_tablesize           = LIBATA_MAX_PRD,
 279         .cmd_per_lun            = ATA_SHT_CMD_PER_LUN,
 280         .emulated               = ATA_SHT_EMULATED,
 281         .use_clustering         = ATA_SHT_USE_CLUSTERING,
 282         .proc_name              = DRV_NAME,
 283         .dma_boundary           = ATA_DMA_BOUNDARY,
 284         .slave_configure        = ata_scsi_slave_config,
 285         .slave_destroy          = ata_scsi_slave_destroy,
 286         .bios_param             = ata_std_bios_param,
 287 };
 288
 289
 290 static const struct ata_port_operations vsc_sata_ops = {
 291         .port_disable           = ata_port_disable,
 292         .tf_load                = vsc_sata_tf_load,
 293         .tf_read                = vsc_sata_tf_read,
 294         .exec_command           = ata_exec_command,
 295         .check_status           = ata_check_status,
 296         .dev_select             = ata_std_dev_select,
 297         .bmdma_setup            = ata_bmdma_setup,
 298         .bmdma_start            = ata_bmdma_start,
 299         .bmdma_stop             = ata_bmdma_stop,
 300         .bmdma_status           = ata_bmdma_status,
 301         .qc_prep                = ata_qc_prep,
 302         .qc_issue               = ata_qc_issue_prot,
 303         .data_xfer              = ata_mmio_data_xfer,
 304         .freeze                 = ata_bmdma_freeze,
 305         .thaw                   = ata_bmdma_thaw,
 306         .error_handler          = ata_bmdma_error_handler,
 307         .post_internal_cmd      = ata_bmdma_post_internal_cmd,
 308         .irq_handler            = vsc_sata_interrupt,
 309         .irq_clear              = ata_bmdma_irq_clear,
 310         .scr_read               = vsc_sata_scr_read,
 311         .scr_write              = vsc_sata_scr_write,
 312         .port_start             = ata_port_start,
 313 };
 314
 315 static void __devinit vsc_sata_setup_port(struct ata_ioports *port, unsigned long base)
 316 {
 317         port->cmd_addr          = base + VSC_SATA_TF_CMD_OFFSET;
 318         port->data_addr         = base + VSC_SATA_TF_DATA_OFFSET;
 319         port->error_addr        = base + VSC_SATA_TF_ERROR_OFFSET;
 320         port->feature_addr      = base + VSC_SATA_TF_FEATURE_OFFSET;
 321         port->nsect_addr        = base + VSC_SATA_TF_NSECT_OFFSET;
 322         port->lbal_addr         = base + VSC_SATA_TF_LBAL_OFFSET;
 323         port->lbam_addr         = base + VSC_SATA_TF_LBAM_OFFSET;
 324         port->lbah_addr         = base + VSC_SATA_TF_LBAH_OFFSET;
 325         port->device_addr       = base + VSC_SATA_TF_DEVICE_OFFSET;
 326         port->status_addr       = base + VSC_SATA_TF_STATUS_OFFSET;
 327         port->command_addr      = base + VSC_SATA_TF_COMMAND_OFFSET;
 328         port->altstatus_addr    = base + VSC_SATA_TF_ALTSTATUS_OFFSET;
 329         port->ctl_addr          = base + VSC_SATA_TF_CTL_OFFSET;
 330         port->bmdma_addr        = base + VSC_SATA_DMA_CMD_OFFSET;
 331         port->scr_addr          = base + VSC_SATA_SCR_STATUS_OFFSET;
 332         writel(0, (void __iomem *) base + VSC_SATA_UP_DESCRIPTOR_OFFSET);
 333         writel(0, (void __iomem *) base + VSC_SATA_UP_DATA_BUFFER_OFFSET);
 334 }
 335
 336
 337 static int __devinit vsc_sata_init_one (struct pci_dev *pdev, const struct pci_device_id *ent)
 338 {
 339         static int printed_version;
 340         struct ata_probe_ent *probe_ent = NULL;
 341         unsigned long base;
 342         void __iomem *mmio_base;
 343         int rc;
 344
 345         if (!printed_version++)
 346                 dev_printk(KERN_DEBUG, &pdev->dev, "version " DRV_VERSION "\n");
 347
 348         rc = pcim_enable_device(pdev);
 349         if (rc)
 350                 return rc;
 351
 352         /*
 353          * Check if we have needed resource mapped.
 354          */
 355         if (pci_resource_len(pdev, 0) == 0)
 356                 return -ENODEV;
 357
 358         rc = pci_request_regions(pdev, DRV_NAME);
 359         if (rc) {
 360                 pcim_pin_device(pdev);
 361                 return rc;
 362         }
 363
 364         /*
 365          * Use 32 bit DMA mask, because 64 bit address support is poor.
 366          */
 367         rc = pci_set_dma_mask(pdev, DMA_32BIT_MASK);
 368         if (rc)
 369                 return rc;
 370         rc = pci_set_consistent_dma_mask(pdev, DMA_32BIT_MASK);
 371         if (rc)
 372                 return rc;
 373
 374         probe_ent = devm_kzalloc(&pdev->dev, sizeof(*probe_ent), GFP_KERNEL);
 375         if (probe_ent == NULL)
 376                 return -ENOMEM;
 377         probe_ent->dev = pci_dev_to_dev(pdev);
 378         INIT_LIST_HEAD(&probe_ent->node);
 379
 380         mmio_base = pcim_iomap(pdev, 0, 0);
 381         if (mmio_base == NULL)
 382                 return -ENOMEM;
 383         base = (unsigned long) mmio_base;
 384
 385         /*
 386          * Due to a bug in the chip, the default cache line size can't be used
 387          */
 388         pci_write_config_byte(pdev, PCI_CACHE_LINE_SIZE, 0x80);
 389
 390         if (pci_enable_msi(pdev) == 0)
 391                 pci_intx(pdev, 0);
 392         else
 393                 probe_ent->irq_flags = IRQF_SHARED;
 394
 395         probe_ent->sht = &vsc_sata_sht;
 396         probe_ent->port_flags = ATA_FLAG_SATA | ATA_FLAG_NO_LEGACY |
 397                                 ATA_FLAG_MMIO;
 398         probe_ent->port_ops = &vsc_sata_ops;
 399         probe_ent->n_ports = 4;
 400         probe_ent->irq = pdev->irq;
 401         probe_ent->mmio_base = mmio_base;
 402
 403         /* We don't care much about the PIO/UDMA masks, but the core won't like us
 404          * if we don't fill these
 405          */
 406         probe_ent->pio_mask = 0x1f;
 407         probe_ent->mwdma_mask = 0x07;
 408         probe_ent->udma_mask = 0x7f;
 409
 410         /* We have 4 ports per PCI function */
 411         vsc_sata_setup_port(&probe_ent->port[0], base + 1 * VSC_SATA_PORT_OFFSET);
 412         vsc_sata_setup_port(&probe_ent->port[1], base + 2 * VSC_SATA_PORT_OFFSET);
 413         vsc_sata_setup_port(&probe_ent->port[2], base + 3 * VSC_SATA_PORT_OFFSET);
 414         vsc_sata_setup_port(&probe_ent->port[3], base + 4 * VSC_SATA_PORT_OFFSET);
 415
 416         pci_set_master(pdev);
 417
 418         /*
 419          * Config offset 0x98 is "Extended Control and Status Register 0"
 420          * Default value is (1 << 28).  All bits except bit 28 are reserved in
 421          * DPA mode.  If bit 28 is set, LED 0 reflects all ports' activity.
 422          * If bit 28 is clear, each port has its own LED.
 423          */
 424         pci_write_config_dword(pdev, 0x98, 0);
 425
 426         if (!ata_device_add(probe_ent))
 427                 return -ENODEV;
 428
 429         devm_kfree(&pdev->dev, probe_ent);
 430         return 0;
 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);