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 vt6420_error_handler(struct ata_port *ap);
  78
  79 static const struct pci_device_id svia_pci_tbl[] = {
  80         { 0x1106, 0x0591, PCI_ANY_ID, PCI_ANY_ID, 0, 0, vt6420 },
  81         { 0x1106, 0x3149, PCI_ANY_ID, PCI_ANY_ID, 0, 0, vt6420 },
  82         { 0x1106, 0x3249, PCI_ANY_ID, PCI_ANY_ID, 0, 0, vt6421 },
  83
  84         { }     /* terminate list */
  85 };
  86
  87 static struct pci_driver svia_pci_driver = {
  88         .name                   = DRV_NAME,
  89         .id_table               = svia_pci_tbl,
  90         .probe                  = svia_init_one,
  91         .remove                 = ata_pci_remove_one,
  92 };
  93
  94 static struct scsi_host_template svia_sht = {
  95         .module                 = THIS_MODULE,
  96         .name                   = DRV_NAME,
  97         .ioctl                  = ata_scsi_ioctl,
  98         .queuecommand           = ata_scsi_queuecmd,
  99         .can_queue              = ATA_DEF_QUEUE,
 100         .this_id                = ATA_SHT_THIS_ID,
 101         .sg_tablesize           = LIBATA_MAX_PRD,
 102         .cmd_per_lun            = ATA_SHT_CMD_PER_LUN,
 103         .emulated               = ATA_SHT_EMULATED,
 104         .use_clustering         = ATA_SHT_USE_CLUSTERING,
 105         .proc_name              = DRV_NAME,
 106         .dma_boundary           = ATA_DMA_BOUNDARY,
 107         .slave_configure        = ata_scsi_slave_config,
 108         .slave_destroy          = ata_scsi_slave_destroy,
 109         .bios_param             = ata_std_bios_param,
 110 };
 111
 112 static const struct ata_port_operations vt6420_sata_ops = {
 113         .port_disable           = ata_port_disable,
 114
 115         .tf_load                = ata_tf_load,
 116         .tf_read                = ata_tf_read,
 117         .check_status           = ata_check_status,
 118         .exec_command           = ata_exec_command,
 119         .dev_select             = ata_std_dev_select,
 120
 121         .bmdma_setup            = ata_bmdma_setup,
 122         .bmdma_start            = ata_bmdma_start,
 123         .bmdma_stop             = ata_bmdma_stop,
 124         .bmdma_status           = ata_bmdma_status,
 125
 126         .qc_prep                = ata_qc_prep,
 127         .qc_issue               = ata_qc_issue_prot,
 128         .data_xfer              = ata_pio_data_xfer,
 129
 130         .freeze                 = ata_bmdma_freeze,
 131         .thaw                   = ata_bmdma_thaw,
 132         .error_handler          = vt6420_error_handler,
 133         .post_internal_cmd      = ata_bmdma_post_internal_cmd,
 134
 135         .irq_handler            = ata_interrupt,
 136         .irq_clear              = ata_bmdma_irq_clear,
 137
 138         .port_start             = ata_port_start,
 139         .port_stop              = ata_port_stop,
 140         .host_stop              = ata_host_stop,
 141 };
 142
 143 static const struct ata_port_operations vt6421_sata_ops = {
 144         .port_disable           = ata_port_disable,
 145
 146         .tf_load                = ata_tf_load,
 147         .tf_read                = ata_tf_read,
 148         .check_status           = ata_check_status,
 149         .exec_command           = ata_exec_command,
 150         .dev_select             = ata_std_dev_select,
 151
 152         .bmdma_setup            = ata_bmdma_setup,
 153         .bmdma_start            = ata_bmdma_start,
 154         .bmdma_stop             = ata_bmdma_stop,
 155         .bmdma_status           = ata_bmdma_status,
 156
 157         .qc_prep                = ata_qc_prep,
 158         .qc_issue               = ata_qc_issue_prot,
 159         .data_xfer              = ata_pio_data_xfer,
 160
 161         .freeze                 = ata_bmdma_freeze,
 162         .thaw                   = ata_bmdma_thaw,
 163         .error_handler          = ata_bmdma_error_handler,
 164         .post_internal_cmd      = ata_bmdma_post_internal_cmd,
 165
 166         .irq_handler            = ata_interrupt,
 167         .irq_clear              = ata_bmdma_irq_clear,
 168
 169         .scr_read               = svia_scr_read,
 170         .scr_write              = svia_scr_write,
 171
 172         .port_start             = ata_port_start,
 173         .port_stop              = ata_port_stop,
 174         .host_stop              = ata_host_stop,
 175 };
 176
 177 static struct ata_port_info vt6420_port_info = {
 178         .sht            = &svia_sht,
 179         .flags          = ATA_FLAG_SATA | ATA_FLAG_NO_LEGACY,
 180         .pio_mask       = 0x1f,
 181         .mwdma_mask     = 0x07,
 182         .udma_mask      = 0x7f,
 183         .port_ops       = &vt6420_sata_ops,
 184 };
 185
 186 MODULE_AUTHOR("Jeff Garzik");
 187 MODULE_DESCRIPTION("SCSI low-level driver for VIA SATA controllers");
 188 MODULE_LICENSE("GPL");
 189 MODULE_DEVICE_TABLE(pci, svia_pci_tbl);
 190 MODULE_VERSION(DRV_VERSION);
 191
 192 static u32 svia_scr_read (struct ata_port *ap, unsigned int sc_reg)
 193 {
 194         if (sc_reg > SCR_CONTROL)
 195                 return 0xffffffffU;
 196         return inl(ap->ioaddr.scr_addr + (4 * sc_reg));
 197 }
 198
 199 static void svia_scr_write (struct ata_port *ap, unsigned int sc_reg, u32 val)
 200 {
 201         if (sc_reg > SCR_CONTROL)
 202                 return;
 203         outl(val, ap->ioaddr.scr_addr + (4 * sc_reg));
 204 }
 205
 206 /**
 207  *      vt6420_prereset - prereset for vt6420
 208  *      @ap: target ATA port
 209  *
 210  *      SCR registers on vt6420 are pieces of shit and may hang the
 211  *      whole machine completely if accessed with the wrong timing.
 212  *      To avoid such catastrophe, vt6420 doesn't provide generic SCR
 213  *      access operations, but uses SStatus and SControl only during
 214  *      boot probing in controlled way.
 215  *
 216  *      As the old (pre EH update) probing code is proven to work, we
 217  *      strictly follow the access pattern.
 218  *
 219  *      LOCKING:
 220  *      Kernel thread context (may sleep)
 221  *
 222  *      RETURNS:
 223  *      0 on success, -errno otherwise.
 224  */
 225 static int vt6420_prereset(struct ata_port *ap)
 226 {
 227         struct ata_eh_context *ehc = &ap->eh_context;
 228         unsigned long timeout = jiffies + (HZ * 5);
 229         u32 sstatus, scontrol;
 230         int online;
 231
 232         /* don't do any SCR stuff if we're not loading */
 233         if (!ATA_PFLAG_LOADING)
 234                 goto skip_scr;
 235
 236         /* Resume phy.  This is the old resume sequence from
 237          * __sata_phy_reset().
 238          */
 239         svia_scr_write(ap, SCR_CONTROL, 0x300);
 240         svia_scr_read(ap, SCR_CONTROL); /* flush */
 241
 242         /* wait for phy to become ready, if necessary */
 243         do {
 244                 msleep(200);
 245                 if ((svia_scr_read(ap, SCR_STATUS) & 0xf) != 1)
 246                         break;
 247         } while (time_before(jiffies, timeout));
 248
 249         /* open code sata_print_link_status() */
 250         sstatus = svia_scr_read(ap, SCR_STATUS);
 251         scontrol = svia_scr_read(ap, SCR_CONTROL);
 252
 253         online = (sstatus & 0xf) == 0x3;
 254
 255         ata_port_printk(ap, KERN_INFO,
 256                         "SATA link %s 1.5 Gbps (SStatus %X SControl %X)\n",
 257                         online ? "up" : "down", sstatus, scontrol);
 258
 259         /* SStatus is read one more time */
 260         svia_scr_read(ap, SCR_STATUS);
 261
 262         if (!online) {
 263                 /* tell EH to bail */
 264                 ehc->i.action &= ~ATA_EH_RESET_MASK;
 265                 return 0;
 266         }
 267
 268  skip_scr:
 269         /* wait for !BSY */
 270         ata_busy_sleep(ap, ATA_TMOUT_BOOT_QUICK, ATA_TMOUT_BOOT);
 271
 272         return 0;
 273 }
 274
 275 static void vt6420_error_handler(struct ata_port *ap)
 276 {
 277         return ata_bmdma_drive_eh(ap, vt6420_prereset, ata_std_softreset,
 278                                   NULL, ata_std_postreset);
 279 }
 280
 281 static const unsigned int svia_bar_sizes[] = {
 282         8, 4, 8, 4, 16, 256
 283 };
 284
 285 static const unsigned int vt6421_bar_sizes[] = {
 286         16, 16, 16, 16, 32, 128
 287 };
 288
 289 static unsigned long svia_scr_addr(unsigned long addr, unsigned int port)
 290 {
 291         return addr + (port * 128);
 292 }
 293
 294 static unsigned long vt6421_scr_addr(unsigned long addr, unsigned int port)
 295 {
 296         return addr + (port * 64);
 297 }
 298
 299 static void vt6421_init_addrs(struct ata_probe_ent *probe_ent,
 300                               struct pci_dev *pdev,
 301                               unsigned int port)
 302 {
 303         unsigned long reg_addr = pci_resource_start(pdev, port);
 304         unsigned long bmdma_addr = pci_resource_start(pdev, 4) + (port * 8);
 305         unsigned long scr_addr;
 306
 307         probe_ent->port[port].cmd_addr = reg_addr;
 308         probe_ent->port[port].altstatus_addr =
 309         probe_ent->port[port].ctl_addr = (reg_addr + 8) | ATA_PCI_CTL_OFS;
 310         probe_ent->port[port].bmdma_addr = bmdma_addr;
 311
 312         scr_addr = vt6421_scr_addr(pci_resource_start(pdev, 5), port);
 313         probe_ent->port[port].scr_addr = scr_addr;
 314
 315         ata_std_ports(&probe_ent->port[port]);
 316 }
 317
 318 static struct ata_probe_ent *vt6420_init_probe_ent(struct pci_dev *pdev)
 319 {
 320         struct ata_probe_ent *probe_ent;
 321         struct ata_port_info *ppi[2];
 322
 323         ppi[0] = ppi[1] = &vt6420_port_info;
 324         probe_ent = ata_pci_init_native_mode(pdev, ppi, ATA_PORT_PRIMARY | ATA_PORT_SECONDARY);
 325         if (!probe_ent)
 326                 return NULL;
 327
 328         probe_ent->port[0].scr_addr =
 329                 svia_scr_addr(pci_resource_start(pdev, 5), 0);
 330         probe_ent->port[1].scr_addr =
 331                 svia_scr_addr(pci_resource_start(pdev, 5), 1);
 332
 333         return probe_ent;
 334 }
 335
 336 static struct ata_probe_ent *vt6421_init_probe_ent(struct pci_dev *pdev)
 337 {
 338         struct ata_probe_ent *probe_ent;
 339         unsigned int i;
 340
 341         probe_ent = kmalloc(sizeof(*probe_ent), GFP_KERNEL);
 342         if (!probe_ent)
 343                 return NULL;
 344
 345         memset(probe_ent, 0, sizeof(*probe_ent));
 346         probe_ent->dev = pci_dev_to_dev(pdev);
 347         INIT_LIST_HEAD(&probe_ent->node);
 348
 349         probe_ent->sht          = &svia_sht;
 350         probe_ent->port_flags   = ATA_FLAG_SATA | ATA_FLAG_NO_LEGACY;
 351         probe_ent->port_ops     = &vt6421_sata_ops;
 352         probe_ent->n_ports      = N_PORTS;
 353         probe_ent->irq          = pdev->irq;
 354         probe_ent->irq_flags    = IRQF_SHARED;
 355         probe_ent->pio_mask     = 0x1f;
 356         probe_ent->mwdma_mask   = 0x07;
 357         probe_ent->udma_mask    = 0x7f;
 358
 359         for (i = 0; i < N_PORTS; i++)
 360                 vt6421_init_addrs(probe_ent, pdev, i);
 361
 362         return probe_ent;
 363 }
 364
 365 static void svia_configure(struct pci_dev *pdev)
 366 {
 367         u8 tmp8;
 368
 369         pci_read_config_byte(pdev, PCI_INTERRUPT_LINE, &tmp8);
 370         dev_printk(KERN_INFO, &pdev->dev, "routed to hard irq line %d\n",
 371                (int) (tmp8 & 0xf0) == 0xf0 ? 0 : tmp8 & 0x0f);
 372
 373         /* make sure SATA channels are enabled */
 374         pci_read_config_byte(pdev, SATA_CHAN_ENAB, &tmp8);
 375         if ((tmp8 & ALL_PORTS) != ALL_PORTS) {
 376                 dev_printk(KERN_DEBUG, &pdev->dev,
 377                            "enabling SATA channels (0x%x)\n",
 378                            (int) tmp8);
 379                 tmp8 |= ALL_PORTS;
 380                 pci_write_config_byte(pdev, SATA_CHAN_ENAB, tmp8);
 381         }
 382
 383         /* make sure interrupts for each channel sent to us */
 384         pci_read_config_byte(pdev, SATA_INT_GATE, &tmp8);
 385         if ((tmp8 & ALL_PORTS) != ALL_PORTS) {
 386                 dev_printk(KERN_DEBUG, &pdev->dev,
 387                            "enabling SATA channel interrupts (0x%x)\n",
 388                            (int) tmp8);
 389                 tmp8 |= ALL_PORTS;
 390                 pci_write_config_byte(pdev, SATA_INT_GATE, tmp8);
 391         }
 392
 393         /* make sure native mode is enabled */
 394         pci_read_config_byte(pdev, SATA_NATIVE_MODE, &tmp8);
 395         if ((tmp8 & NATIVE_MODE_ALL) != NATIVE_MODE_ALL) {
 396                 dev_printk(KERN_DEBUG, &pdev->dev,
 397                            "enabling SATA channel native mode (0x%x)\n",
 398                            (int) tmp8);
 399                 tmp8 |= NATIVE_MODE_ALL;
 400                 pci_write_config_byte(pdev, SATA_NATIVE_MODE, tmp8);
 401         }
 402 }
 403
 404 static int svia_init_one (struct pci_dev *pdev, const struct pci_device_id *ent)
 405 {
 406         static int printed_version;
 407         unsigned int i;
 408         int rc;
 409         struct ata_probe_ent *probe_ent;
 410         int board_id = (int) ent->driver_data;
 411         const int *bar_sizes;
 412         int pci_dev_busy = 0;
 413         u8 tmp8;
 414
 415         if (!printed_version++)
 416                 dev_printk(KERN_DEBUG, &pdev->dev, "version " DRV_VERSION "\n");
 417
 418         rc = pci_enable_device(pdev);
 419         if (rc)
 420                 return rc;
 421
 422         rc = pci_request_regions(pdev, DRV_NAME);
 423         if (rc) {
 424                 pci_dev_busy = 1;
 425                 goto err_out;
 426         }
 427
 428         if (board_id == vt6420) {
 429                 pci_read_config_byte(pdev, SATA_PATA_SHARING, &tmp8);
 430                 if (tmp8 & SATA_2DEV) {
 431                         dev_printk(KERN_ERR, &pdev->dev,
 432                                    "SATA master/slave not supported (0x%x)\n",
 433                                    (int) tmp8);
 434                         rc = -EIO;
 435                         goto err_out_regions;
 436                 }
 437
 438                 bar_sizes = &svia_bar_sizes[0];
 439         } else {
 440                 bar_sizes = &vt6421_bar_sizes[0];
 441         }
 442
 443         for (i = 0; i < ARRAY_SIZE(svia_bar_sizes); i++)
 444                 if ((pci_resource_start(pdev, i) == 0) ||
 445                     (pci_resource_len(pdev, i) < bar_sizes[i])) {
 446                         dev_printk(KERN_ERR, &pdev->dev,
 447                                 "invalid PCI BAR %u (sz 0x%llx, val 0x%llx)\n",
 448                                 i,
 449                                 (unsigned long long)pci_resource_start(pdev, i),
 450                                 (unsigned long long)pci_resource_len(pdev, i));
 451                         rc = -ENODEV;
 452                         goto err_out_regions;
 453                 }
 454
 455         rc = pci_set_dma_mask(pdev, ATA_DMA_MASK);
 456         if (rc)
 457                 goto err_out_regions;
 458         rc = pci_set_consistent_dma_mask(pdev, ATA_DMA_MASK);
 459         if (rc)
 460                 goto err_out_regions;
 461
 462         if (board_id == vt6420)
 463                 probe_ent = vt6420_init_probe_ent(pdev);
 464         else
 465                 probe_ent = vt6421_init_probe_ent(pdev);
 466
 467         if (!probe_ent) {
 468                 dev_printk(KERN_ERR, &pdev->dev, "out of memory\n");
 469                 rc = -ENOMEM;
 470                 goto err_out_regions;
 471         }
 472
 473         svia_configure(pdev);
 474
 475         pci_set_master(pdev);
 476
 477         /* FIXME: check ata_device_add return value */
 478         ata_device_add(probe_ent);
 479         kfree(probe_ent);
 480
 481         return 0;
 482
 483 err_out_regions:
 484         pci_release_regions(pdev);
 485 err_out:
 486         if (!pci_dev_busy)
 487                 pci_disable_device(pdev);
 488         return rc;
 489 }
 490
 491 static int __init svia_init(void)
 492 {
 493         return pci_register_driver(&svia_pci_driver);
 494 }
 495
 496 static void __exit svia_exit(void)
 497 {
 498         pci_unregister_driver(&svia_pci_driver);
 499 }
 500
 501 module_init(svia_init);
 502 module_exit(svia_exit);
 503