drivers/ata/sata_via.c

   1 /*
   2  *  sata_via.c - VIA Serial ATA controllers
   3  *
   4  *  Maintained by:  Jeff Garzik <jgarzik@pobox.com>
   5  *                 Please ALWAYS copy linux-ide@vger.kernel.org
   6                    on emails.
   7  *
   8  *  Copyright 2003-2004 Red Hat, Inc.  All rights reserved.
   9  *  Copyright 2003-2004 Jeff Garzik
  10  *
  11  *
  12  *  This program is free software; you can redistribute it and/or modify
  13  *  it under the terms of the GNU General Public License as published by
  14  *  the Free Software Foundation; either version 2, or (at your option)
  15  *  any later version.
  16  *
  17  *  This program is distributed in the hope that it will be useful,
  18  *  but WITHOUT ANY WARRANTY; without even the implied warranty of
  19  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  20  *  GNU General Public License for more details.
  21  *
  22  *  You should have received a copy of the GNU General Public License
  23  *  along with this program; see the file COPYING.  If not, write to
  24  *  the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA.
  25  *
  26  *
  27  *  libata documentation is available via 'make {ps|pdf}docs',
  28  *  as Documentation/DocBook/libata.*
  29  *
  30  *  Hardware documentation available under NDA.
  31  *
  32  *
  33  *  To-do list:
  34  *  - VT6421 PATA support
  35  *
  36  */
  37
  38 #include <linux/kernel.h>
  39 #include <linux/module.h>
  40 #include <linux/pci.h>
  41 #include <linux/init.h>
  42 #include <linux/blkdev.h>
  43 #include <linux/delay.h>
  44 #include <linux/device.h>
  45 #include <scsi/scsi_host.h>
  46 #include <linux/libata.h>
  47 #include <asm/io.h>
  48
  49 #define DRV_NAME        "sata_via"
  50 #define DRV_VERSION     "2.0"
  51
  52 enum board_ids_enum {
  53         vt6420,
  54         vt6421,
  55 };
  56
  57 enum {
  58         SATA_CHAN_ENAB          = 0x40, /* SATA channel enable */
  59         SATA_INT_GATE           = 0x41, /* SATA interrupt gating */
  60         SATA_NATIVE_MODE        = 0x42, /* Native mode enable */
  61         SATA_PATA_SHARING       = 0x49, /* PATA/SATA sharing func ctrl */
  62
  63         PORT0                   = (1 << 1),
  64         PORT1                   = (1 << 0),
  65         ALL_PORTS               = PORT0 | PORT1,
  66         N_PORTS                 = 2,
  67
  68         NATIVE_MODE_ALL         = (1 << 7) | (1 << 6) | (1 << 5) | (1 << 4),
  69
  70         SATA_EXT_PHY            = (1 << 6), /* 0==use PATA, 1==ext phy */
  71         SATA_2DEV               = (1 << 5), /* SATA is master/slave */
  72 };
  73
  74 static int svia_init_one (struct pci_dev *pdev, const struct pci_device_id *ent);
  75 static u32 svia_scr_read (struct ata_port *ap, unsigned int sc_reg);
  76 static void svia_scr_write (struct ata_port *ap, unsigned int sc_reg, u32 val);
  77 static void svia_noop_freeze(struct ata_port *ap);
  78 static void vt6420_error_handler(struct ata_port *ap);
  79
  80 static const struct pci_device_id svia_pci_tbl[] = {
  81         { PCI_VDEVICE(VIA, 0x5337), vt6420 },
  82         { PCI_VDEVICE(VIA, 0x0591), vt6420 },
  83         { PCI_VDEVICE(VIA, 0x3149), vt6420 },
  84         { PCI_VDEVICE(VIA, 0x3249), vt6421 },
  85
  86         { }     /* terminate list */
  87 };
  88
  89 static struct pci_driver svia_pci_driver = {
  90         .name                   = DRV_NAME,
  91         .id_table               = svia_pci_tbl,
  92         .probe                  = svia_init_one,
  93         .remove                 = ata_pci_remove_one,
  94 };
  95
  96 static struct scsi_host_template svia_sht = {
  97         .module                 = THIS_MODULE,
  98         .name                   = DRV_NAME,
  99         .ioctl                  = ata_scsi_ioctl,
 100         .queuecommand           = ata_scsi_queuecmd,
 101         .can_queue              = ATA_DEF_QUEUE,
 102         .this_id                = ATA_SHT_THIS_ID,
 103         .sg_tablesize           = LIBATA_MAX_PRD,
 104         .cmd_per_lun            = ATA_SHT_CMD_PER_LUN,
 105         .emulated               = ATA_SHT_EMULATED,
 106         .use_clustering         = ATA_SHT_USE_CLUSTERING,
 107         .proc_name              = DRV_NAME,
 108         .dma_boundary           = ATA_DMA_BOUNDARY,
 109         .slave_configure        = ata_scsi_slave_config,
 110         .slave_destroy          = ata_scsi_slave_destroy,
 111         .bios_param             = ata_std_bios_param,
 112 };
 113
 114 static const struct ata_port_operations vt6420_sata_ops = {
 115         .port_disable           = ata_port_disable,
 116
 117         .tf_load                = ata_tf_load,
 118         .tf_read                = ata_tf_read,
 119         .check_status           = ata_check_status,
 120         .exec_command           = ata_exec_command,
 121         .dev_select             = ata_std_dev_select,
 122
 123         .bmdma_setup            = ata_bmdma_setup,
 124         .bmdma_start            = ata_bmdma_start,
 125         .bmdma_stop             = ata_bmdma_stop,
 126         .bmdma_status           = ata_bmdma_status,
 127
 128         .qc_prep                = ata_qc_prep,
 129         .qc_issue               = ata_qc_issue_prot,
 130         .data_xfer              = ata_pio_data_xfer,
 131
 132         .freeze                 = svia_noop_freeze,
 133         .thaw                   = ata_bmdma_thaw,
 134         .error_handler          = vt6420_error_handler,
 135         .post_internal_cmd      = ata_bmdma_post_internal_cmd,
 136
 137         .irq_handler            = ata_interrupt,
 138         .irq_clear              = ata_bmdma_irq_clear,
 139
 140         .port_start             = ata_port_start,
 141         .port_stop              = ata_port_stop,
 142         .host_stop              = ata_host_stop,
 143 };
 144
 145 static const struct ata_port_operations vt6421_sata_ops = {
 146         .port_disable           = ata_port_disable,
 147
 148         .tf_load                = ata_tf_load,
 149         .tf_read                = ata_tf_read,
 150         .check_status           = ata_check_status,
 151         .exec_command           = ata_exec_command,
 152         .dev_select             = ata_std_dev_select,
 153
 154         .bmdma_setup            = ata_bmdma_setup,
 155         .bmdma_start            = ata_bmdma_start,
 156         .bmdma_stop             = ata_bmdma_stop,
 157         .bmdma_status           = ata_bmdma_status,
 158
 159         .qc_prep                = ata_qc_prep,
 160         .qc_issue               = ata_qc_issue_prot,
 161         .data_xfer              = ata_pio_data_xfer,
 162
 163         .freeze                 = ata_bmdma_freeze,
 164         .thaw                   = ata_bmdma_thaw,
 165         .error_handler          = ata_bmdma_error_handler,
 166         .post_internal_cmd      = ata_bmdma_post_internal_cmd,
 167
 168         .irq_handler            = ata_interrupt,
 169         .irq_clear              = ata_bmdma_irq_clear,
 170
 171         .scr_read               = svia_scr_read,
 172         .scr_write              = svia_scr_write,
 173
 174         .port_start             = ata_port_start,
 175         .port_stop              = ata_port_stop,
 176         .host_stop              = ata_host_stop,
 177 };
 178
 179 static struct ata_port_info vt6420_port_info = {
 180         .sht            = &svia_sht,
 181         .flags          = ATA_FLAG_SATA | ATA_FLAG_NO_LEGACY,
 182         .pio_mask       = 0x1f,
 183         .mwdma_mask     = 0x07,
 184         .udma_mask      = 0x7f,
 185         .port_ops       = &vt6420_sata_ops,
 186 };
 187
 188 MODULE_AUTHOR("Jeff Garzik");
 189 MODULE_DESCRIPTION("SCSI low-level driver for VIA SATA controllers");
 190 MODULE_LICENSE("GPL");
 191 MODULE_DEVICE_TABLE(pci, svia_pci_tbl);
 192 MODULE_VERSION(DRV_VERSION);
 193
 194 static u32 svia_scr_read (struct ata_port *ap, unsigned int sc_reg)
 195 {
 196         if (sc_reg > SCR_CONTROL)
 197                 return 0xffffffffU;
 198         return inl(ap->ioaddr.scr_addr + (4 * sc_reg));
 199 }
 200
 201 static void svia_scr_write (struct ata_port *ap, unsigned int sc_reg, u32 val)
 202 {
 203         if (sc_reg > SCR_CONTROL)
 204                 return;
 205         outl(val, ap->ioaddr.scr_addr + (4 * sc_reg));
 206 }
 207
 208 static void svia_noop_freeze(struct ata_port *ap)
 209 {
 210         /* Some VIA controllers choke if ATA_NIEN is manipulated in
 211          * certain way.  Leave it alone and just clear pending IRQ.
 212          */
 213         ata_chk_status(ap);
 214         ata_bmdma_irq_clear(ap);
 215 }
 216
 217 /**
 218  *      vt6420_prereset - prereset for vt6420
 219  *      @ap: target ATA port
 220  *
 221  *      SCR registers on vt6420 are pieces of shit and may hang the
 222  *      whole machine completely if accessed with the wrong timing.
 223  *      To avoid such catastrophe, vt6420 doesn't provide generic SCR
 224  *      access operations, but uses SStatus and SControl only during
 225  *      boot probing in controlled way.
 226  *
 227  *      As the old (pre EH update) probing code is proven to work, we
 228  *      strictly follow the access pattern.
 229  *
 230  *      LOCKING:
 231  *      Kernel thread context (may sleep)
 232  *
 233  *      RETURNS:
 234  *      0 on success, -errno otherwise.
 235  */
 236 static int vt6420_prereset(struct ata_port *ap)
 237 {
 238         struct ata_eh_context *ehc = &ap->eh_context;
 239         unsigned long timeout = jiffies + (HZ * 5);
 240         u32 sstatus, scontrol;
 241         int online;
 242
 243         /* don't do any SCR stuff if we're not loading */
 244         if (!(ap->pflags & ATA_PFLAG_LOADING))
 245                 goto skip_scr;
 246
 247         /* Resume phy.  This is the old resume sequence from
 248          * __sata_phy_reset().
 249          */
 250         svia_scr_write(ap, SCR_CONTROL, 0x300);
 251         svia_scr_read(ap, SCR_CONTROL); /* flush */
 252
 253         /* wait for phy to become ready, if necessary */
 254         do {
 255                 msleep(200);
 256                 if ((svia_scr_read(ap, SCR_STATUS) & 0xf) != 1)
 257                         break;
 258         } while (time_before(jiffies, timeout));
 259
 260         /* open code sata_print_link_status() */
 261         sstatus = svia_scr_read(ap, SCR_STATUS);
 262         scontrol = svia_scr_read(ap, SCR_CONTROL);
 263
 264         online = (sstatus & 0xf) == 0x3;
 265
 266         ata_port_printk(ap, KERN_INFO,
 267                         "SATA link %s 1.5 Gbps (SStatus %X SControl %X)\n",
 268                         online ? "up" : "down", sstatus, scontrol);
 269
 270         /* SStatus is read one more time */
 271         svia_scr_read(ap, SCR_STATUS);
 272
 273         if (!online) {
 274                 /* tell EH to bail */
 275                 ehc->i.action &= ~ATA_EH_RESET_MASK;
 276                 return 0;
 277         }
 278
 279  skip_scr:
 280         /* wait for !BSY */
 281         ata_busy_sleep(ap, ATA_TMOUT_BOOT_QUICK, ATA_TMOUT_BOOT);
 282
 283         return 0;
 284 }
 285
 286 static void vt6420_error_handler(struct ata_port *ap)
 287 {
 288         return ata_bmdma_drive_eh(ap, vt6420_prereset, ata_std_softreset,
 289                                   NULL, ata_std_postreset);
 290 }
 291
 292 static const unsigned int svia_bar_sizes[] = {
 293         8, 4, 8, 4, 16, 256
 294 };
 295
 296 static const unsigned int vt6421_bar_sizes[] = {
 297         16, 16, 16, 16, 32, 128
 298 };
 299
 300 static unsigned long svia_scr_addr(unsigned long addr, unsigned int port)
 301 {
 302         return addr + (port * 128);
 303 }
 304
 305 static unsigned long vt6421_scr_addr(unsigned long addr, unsigned int port)
 306 {
 307         return addr + (port * 64);
 308 }
 309
 310 static void vt6421_init_addrs(struct ata_probe_ent *probe_ent,
 311                               struct pci_dev *pdev,
 312                               unsigned int port)
 313 {
 314         unsigned long reg_addr = pci_resource_start(pdev, port);
 315         unsigned long bmdma_addr = pci_resource_start(pdev, 4) + (port * 8);
 316         unsigned long scr_addr;
 317
 318         probe_ent->port[port].cmd_addr = reg_addr;
 319         probe_ent->port[port].altstatus_addr =
 320         probe_ent->port[port].ctl_addr = (reg_addr + 8) | ATA_PCI_CTL_OFS;
 321         probe_ent->port[port].bmdma_addr = bmdma_addr;
 322
 323         scr_addr = vt6421_scr_addr(pci_resource_start(pdev, 5), port);
 324         probe_ent->port[port].scr_addr = scr_addr;
 325
 326         ata_std_ports(&probe_ent->port[port]);
 327 }
 328
 329 static struct ata_probe_ent *vt6420_init_probe_ent(struct pci_dev *pdev)
 330 {
 331         struct ata_probe_ent *probe_ent;
 332         struct ata_port_info *ppi[2];
 333
 334         ppi[0] = ppi[1] = &vt6420_port_info;
 335         probe_ent = ata_pci_init_native_mode(pdev, ppi, ATA_PORT_PRIMARY | ATA_PORT_SECONDARY);
 336         if (!probe_ent)
 337                 return NULL;
 338
 339         probe_ent->port[0].scr_addr =
 340                 svia_scr_addr(pci_resource_start(pdev, 5), 0);
 341         probe_ent->port[1].scr_addr =
 342                 svia_scr_addr(pci_resource_start(pdev, 5), 1);
 343
 344         return probe_ent;
 345 }
 346
 347 static struct ata_probe_ent *vt6421_init_probe_ent(struct pci_dev *pdev)
 348 {
 349         struct ata_probe_ent *probe_ent;
 350         unsigned int i;
 351
 352         probe_ent = kmalloc(sizeof(*probe_ent), GFP_KERNEL);
 353         if (!probe_ent)
 354                 return NULL;
 355
 356         memset(probe_ent, 0, sizeof(*probe_ent));
 357         probe_ent->dev = pci_dev_to_dev(pdev);
 358         INIT_LIST_HEAD(&probe_ent->node);
 359
 360         probe_ent->sht          = &svia_sht;
 361         probe_ent->port_flags   = ATA_FLAG_SATA | ATA_FLAG_NO_LEGACY;
 362         probe_ent->port_ops     = &vt6421_sata_ops;
 363         probe_ent->n_ports      = N_PORTS;
 364         probe_ent->irq          = pdev->irq;
 365         probe_ent->irq_flags    = IRQF_SHARED;
 366         probe_ent->pio_mask     = 0x1f;
 367         probe_ent->mwdma_mask   = 0x07;
 368         probe_ent->udma_mask    = 0x7f;
 369
 370         for (i = 0; i < N_PORTS; i++)
 371                 vt6421_init_addrs(probe_ent, pdev, i);
 372
 373         return probe_ent;
 374 }
 375
 376 static void svia_configure(struct pci_dev *pdev)
 377 {
 378         u8 tmp8;
 379
 380         pci_read_config_byte(pdev, PCI_INTERRUPT_LINE, &tmp8);
 381         dev_printk(KERN_INFO, &pdev->dev, "routed to hard irq line %d\n",
 382                (int) (tmp8 & 0xf0) == 0xf0 ? 0 : tmp8 & 0x0f);
 383
 384         /* make sure SATA channels are enabled */
 385         pci_read_config_byte(pdev, SATA_CHAN_ENAB, &tmp8);
 386         if ((tmp8 & ALL_PORTS) != ALL_PORTS) {
 387                 dev_printk(KERN_DEBUG, &pdev->dev,
 388                            "enabling SATA channels (0x%x)\n",
 389                            (int) tmp8);
 390                 tmp8 |= ALL_PORTS;
 391                 pci_write_config_byte(pdev, SATA_CHAN_ENAB, tmp8);
 392         }
 393
 394         /* make sure interrupts for each channel sent to us */
 395         pci_read_config_byte(pdev, SATA_INT_GATE, &tmp8);
 396         if ((tmp8 & ALL_PORTS) != ALL_PORTS) {
 397                 dev_printk(KERN_DEBUG, &pdev->dev,
 398                            "enabling SATA channel interrupts (0x%x)\n",
 399                            (int) tmp8);
 400                 tmp8 |= ALL_PORTS;
 401                 pci_write_config_byte(pdev, SATA_INT_GATE, tmp8);
 402         }
 403
 404         /* make sure native mode is enabled */
 405         pci_read_config_byte(pdev, SATA_NATIVE_MODE, &tmp8);
 406         if ((tmp8 & NATIVE_MODE_ALL) != NATIVE_MODE_ALL) {
 407                 dev_printk(KERN_DEBUG, &pdev->dev,
 408                            "enabling SATA channel native mode (0x%x)\n",
 409                            (int) tmp8);
 410                 tmp8 |= NATIVE_MODE_ALL;
 411                 pci_write_config_byte(pdev, SATA_NATIVE_MODE, tmp8);
 412         }
 413 }
 414
 415 static int svia_init_one (struct pci_dev *pdev, const struct pci_device_id *ent)
 416 {
 417         static int printed_version;
 418         unsigned int i;
 419         int rc;
 420         struct ata_probe_ent *probe_ent;
 421         int board_id = (int) ent->driver_data;
 422         const int *bar_sizes;
 423         int pci_dev_busy = 0;
 424         u8 tmp8;
 425
 426         if (!printed_version++)
 427                 dev_printk(KERN_DEBUG, &pdev->dev, "version " DRV_VERSION "\n");
 428
 429         rc = pci_enable_device(pdev);
 430         if (rc)
 431                 return rc;
 432
 433         rc = pci_request_regions(pdev, DRV_NAME);
 434         if (rc) {
 435                 pci_dev_busy = 1;
 436                 goto err_out;
 437         }
 438
 439         if (board_id == vt6420) {
 440                 pci_read_config_byte(pdev, SATA_PATA_SHARING, &tmp8);
 441                 if (tmp8 & SATA_2DEV) {
 442                         dev_printk(KERN_ERR, &pdev->dev,
 443                                    "SATA master/slave not supported (0x%x)\n",
 444                                    (int) tmp8);
 445                         rc = -EIO;
 446                         goto err_out_regions;
 447                 }
 448
 449                 bar_sizes = &svia_bar_sizes[0];
 450         } else {
 451                 bar_sizes = &vt6421_bar_sizes[0];
 452         }
 453
 454         for (i = 0; i < ARRAY_SIZE(svia_bar_sizes); i++)
 455                 if ((pci_resource_start(pdev, i) == 0) ||
 456                     (pci_resource_len(pdev, i) < bar_sizes[i])) {
 457                         dev_printk(KERN_ERR, &pdev->dev,
 458                                 "invalid PCI BAR %u (sz 0x%llx, val 0x%llx)\n",
 459                                 i,
 460                                 (unsigned long long)pci_resource_start(pdev, i),
 461                                 (unsigned long long)pci_resource_len(pdev, i));
 462                         rc = -ENODEV;
 463                         goto err_out_regions;
 464                 }
 465
 466         rc = pci_set_dma_mask(pdev, ATA_DMA_MASK);
 467         if (rc)
 468                 goto err_out_regions;
 469         rc = pci_set_consistent_dma_mask(pdev, ATA_DMA_MASK);
 470         if (rc)
 471                 goto err_out_regions;
 472
 473         if (board_id == vt6420)
 474                 probe_ent = vt6420_init_probe_ent(pdev);
 475         else
 476                 probe_ent = vt6421_init_probe_ent(pdev);
 477
 478         if (!probe_ent) {
 479                 dev_printk(KERN_ERR, &pdev->dev, "out of memory\n");
 480                 rc = -ENOMEM;
 481                 goto err_out_regions;
 482         }
 483
 484         svia_configure(pdev);
 485
 486         pci_set_master(pdev);
 487
 488         /* FIXME: check ata_device_add return value */
 489         ata_device_add(probe_ent);
 490         kfree(probe_ent);
 491
 492         return 0;
 493
 494 err_out_regions:
 495         pci_release_regions(pdev);
 496 err_out:
 497         if (!pci_dev_busy)
 498                 pci_disable_device(pdev);
 499         return rc;
 500 }
 501
 502 static int __init svia_init(void)
 503 {
 504         return pci_register_driver(&svia_pci_driver);
 505 }
 506
 507 static void __exit svia_exit(void)
 508 {
 509         pci_unregister_driver(&svia_pci_driver);
 510 }
 511
 512 module_init(svia_init);
 513 module_exit(svia_exit);
 514