git.oblomov.eu Git - linux-2.6/blob - drivers/ide/sgiioc4.c

   1 /*
   2  * Copyright (c) 2003-2006 Silicon Graphics, Inc.  All Rights Reserved.
   3  * Copyright (C) 2008-2009 MontaVista Software, Inc.
   4  *
   5  * This program is free software; you can redistribute it and/or modify it
   6  * under the terms of version 2 of the GNU General Public License
   7  * as published by the Free Software Foundation.
   8  *
   9  * This program is distributed in the hope that it would be useful, but
  10  * WITHOUT ANY WARRANTY; without even the implied warranty of
  11  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
  12  *
  13  * You should have received a copy of the GNU General Public
  14  * License along with this program; if not, write the Free Software
  15  * Foundation, Inc., 59 Temple Place - Suite 330, Boston MA 02111-1307, USA.
  16  *
  17  * For further information regarding this notice, see:
  18  *
  19  * http://oss.sgi.com/projects/GenInfo/NoticeExplan
  20  */
  21
  22 #include <linux/module.h>
  23 #include <linux/types.h>
  24 #include <linux/pci.h>
  25 #include <linux/delay.h>
  26 #include <linux/init.h>
  27 #include <linux/kernel.h>
  28 #include <linux/ioport.h>
  29 #include <linux/blkdev.h>
  30 #include <linux/scatterlist.h>
  31 #include <linux/ioc4.h>
  32 #include <linux/io.h>
  33 #include <linux/ide.h>
  34
  35 #define DRV_NAME "SGIIOC4"
  36
  37 /* IOC4 Specific Definitions */
  38 #define IOC4_CMD_OFFSET         0x100
  39 #define IOC4_CTRL_OFFSET        0x120
  40 #define IOC4_DMA_OFFSET         0x140
  41 #define IOC4_INTR_OFFSET        0x0
  42
  43 #define IOC4_TIMING             0x00
  44 #define IOC4_DMA_PTR_L          0x01
  45 #define IOC4_DMA_PTR_H          0x02
  46 #define IOC4_DMA_ADDR_L         0x03
  47 #define IOC4_DMA_ADDR_H         0x04
  48 #define IOC4_BC_DEV             0x05
  49 #define IOC4_BC_MEM             0x06
  50 #define IOC4_DMA_CTRL           0x07
  51 #define IOC4_DMA_END_ADDR       0x08
  52
  53 /* Bits in the IOC4 Control/Status Register */
  54 #define IOC4_S_DMA_START        0x01
  55 #define IOC4_S_DMA_STOP         0x02
  56 #define IOC4_S_DMA_DIR          0x04
  57 #define IOC4_S_DMA_ACTIVE       0x08
  58 #define IOC4_S_DMA_ERROR        0x10
  59 #define IOC4_ATA_MEMERR         0x02
  60
  61 /* Read/Write Directions */
  62 #define IOC4_DMA_WRITE          0x04
  63 #define IOC4_DMA_READ           0x00
  64
  65 /* Interrupt Register Offsets */
  66 #define IOC4_INTR_REG           0x03
  67 #define IOC4_INTR_SET           0x05
  68 #define IOC4_INTR_CLEAR         0x07
  69
  70 #define IOC4_IDE_CACHELINE_SIZE 128
  71 #define IOC4_CMD_CTL_BLK_SIZE   0x20
  72 #define IOC4_SUPPORTED_FIRMWARE_REV 46
  73
  74 struct ioc4_dma_regs {
  75         u32 timing_reg0;
  76         u32 timing_reg1;
  77         u32 low_mem_ptr;
  78         u32 high_mem_ptr;
  79         u32 low_mem_addr;
  80         u32 high_mem_addr;
  81         u32 dev_byte_count;
  82         u32 mem_byte_count;
  83         u32 status;
  84 };
  85
  86 /* Each Physical Region Descriptor Entry size is 16 bytes (2 * 64 bits) */
  87 /* IOC4 has only 1 IDE channel */
  88 #define IOC4_PRD_BYTES          16
  89 #define IOC4_PRD_ENTRIES        (PAGE_SIZE / (4 * IOC4_PRD_BYTES))
  90
  91
  92 static void sgiioc4_init_hwif_ports(struct ide_hw *hw,
  93                                     unsigned long data_port,
  94                                     unsigned long ctrl_port,
  95                                     unsigned long irq_port)
  96 {
  97         unsigned long reg = data_port;
  98         int i;
  99
 100         /* Registers are word (32 bit) aligned */
 101         for (i = 0; i <= 7; i++)
 102                 hw->io_ports_array[i] = reg + i * 4;
 103
 104         hw->io_ports.ctl_addr = ctrl_port;
 105         hw->io_ports.irq_addr = irq_port;
 106 }
 107
 108 static int sgiioc4_checkirq(ide_hwif_t *hwif)
 109 {
 110         unsigned long intr_addr = hwif->io_ports.irq_addr + IOC4_INTR_REG * 4;
 111
 112         if (readl((void __iomem *)intr_addr) & 0x03)
 113                 return 1;
 114
 115         return 0;
 116 }
 117
 118 static u8 sgiioc4_read_status(ide_hwif_t *);
 119
 120 static int sgiioc4_clearirq(ide_drive_t *drive)
 121 {
 122         u32 intr_reg;
 123         ide_hwif_t *hwif = drive->hwif;
 124         struct ide_io_ports *io_ports = &hwif->io_ports;
 125         unsigned long other_ir = io_ports->irq_addr + (IOC4_INTR_REG << 2);
 126
 127         /* Code to check for PCI error conditions */
 128         intr_reg = readl((void __iomem *)other_ir);
 129         if (intr_reg & 0x03) { /* Valid IOC4-IDE interrupt */
 130                 /*
 131                  * Using sgiioc4_read_status to read the Status register has a
 132                  * side effect of clearing the interrupt.  The first read should
 133                  * clear it if it is set.  The second read should return
 134                  * a "clear" status if it got cleared.  If not, then spin
 135                  * for a bit trying to clear it.
 136                  */
 137                 u8 stat = sgiioc4_read_status(hwif);
 138                 int count = 0;
 139
 140                 stat = sgiioc4_read_status(hwif);
 141                 while ((stat & ATA_BUSY) && (count++ < 100)) {
 142                         udelay(1);
 143                         stat = sgiioc4_read_status(hwif);
 144                 }
 145
 146                 if (intr_reg & 0x02) {
 147                         struct pci_dev *dev = to_pci_dev(hwif->dev);
 148                         /* Error when transferring DMA data on PCI bus */
 149                         u32 pci_err_addr_low, pci_err_addr_high,
 150                             pci_stat_cmd_reg;
 151
 152                         pci_err_addr_low =
 153                                 readl((void __iomem *)io_ports->irq_addr);
 154                         pci_err_addr_high =
 155                                 readl((void __iomem *)(io_ports->irq_addr + 4));
 156                         pci_read_config_dword(dev, PCI_COMMAND,
 157                                               &pci_stat_cmd_reg);
 158                         printk(KERN_ERR "%s(%s): PCI Bus Error when doing DMA: "
 159                                "status-cmd reg is 0x%x\n",
 160                                __func__, drive->name, pci_stat_cmd_reg);
 161                         printk(KERN_ERR "%s(%s): PCI Error Address is 0x%x%x\n",
 162                                __func__, drive->name,
 163                                pci_err_addr_high, pci_err_addr_low);
 164                         /* Clear the PCI Error indicator */
 165                         pci_write_config_dword(dev, PCI_COMMAND, 0x00000146);
 166                 }
 167
 168                 /* Clear the Interrupt, Error bits on the IOC4 */
 169                 writel(0x03, (void __iomem *)other_ir);
 170
 171                 intr_reg = readl((void __iomem *)other_ir);
 172         }
 173
 174         return intr_reg & 3;
 175 }
 176
 177 static void sgiioc4_dma_start(ide_drive_t *drive)
 178 {
 179         ide_hwif_t *hwif = drive->hwif;
 180         unsigned long ioc4_dma_addr = hwif->dma_base + IOC4_DMA_CTRL * 4;
 181         unsigned int reg = readl((void __iomem *)ioc4_dma_addr);
 182         unsigned int temp_reg = reg | IOC4_S_DMA_START;
 183
 184         writel(temp_reg, (void __iomem *)ioc4_dma_addr);
 185 }
 186
 187 static u32 sgiioc4_ide_dma_stop(ide_hwif_t *hwif, u64 dma_base)
 188 {
 189         unsigned long ioc4_dma_addr = dma_base + IOC4_DMA_CTRL * 4;
 190         u32     ioc4_dma;
 191         int     count;
 192
 193         count = 0;
 194         ioc4_dma = readl((void __iomem *)ioc4_dma_addr);
 195         while ((ioc4_dma & IOC4_S_DMA_STOP) && (count++ < 200)) {
 196                 udelay(1);
 197                 ioc4_dma = readl((void __iomem *)ioc4_dma_addr);
 198         }
 199         return ioc4_dma;
 200 }
 201
 202 /* Stops the IOC4 DMA Engine */
 203 static int sgiioc4_dma_end(ide_drive_t *drive)
 204 {
 205         u32 ioc4_dma, bc_dev, bc_mem, num, valid = 0, cnt = 0;
 206         ide_hwif_t *hwif = drive->hwif;
 207         unsigned long dma_base = hwif->dma_base;
 208         int dma_stat = 0;
 209         unsigned long *ending_dma = ide_get_hwifdata(hwif);
 210
 211         writel(IOC4_S_DMA_STOP, (void __iomem *)(dma_base + IOC4_DMA_CTRL * 4));
 212
 213         ioc4_dma = sgiioc4_ide_dma_stop(hwif, dma_base);
 214
 215         if (ioc4_dma & IOC4_S_DMA_STOP) {
 216                 printk(KERN_ERR
 217                        "%s(%s): IOC4 DMA STOP bit is still 1 :"
 218                        "ioc4_dma_reg 0x%x\n",
 219                        __func__, drive->name, ioc4_dma);
 220                 dma_stat = 1;
 221         }
 222
 223         /*
 224          * The IOC4 will DMA 1's to the ending DMA area to indicate that
 225          * previous data DMA is complete.  This is necessary because of relaxed
 226          * ordering between register reads and DMA writes on the Altix.
 227          */
 228         while ((cnt++ < 200) && (!valid)) {
 229                 for (num = 0; num < 16; num++) {
 230                         if (ending_dma[num]) {
 231                                 valid = 1;
 232                                 break;
 233                         }
 234                 }
 235                 udelay(1);
 236         }
 237         if (!valid) {
 238                 printk(KERN_ERR "%s(%s) : DMA incomplete\n", __func__,
 239                        drive->name);
 240                 dma_stat = 1;
 241         }
 242
 243         bc_dev = readl((void __iomem *)(dma_base + IOC4_BC_DEV * 4));
 244         bc_mem = readl((void __iomem *)(dma_base + IOC4_BC_MEM * 4));
 245
 246         if ((bc_dev & 0x01FF) || (bc_mem & 0x1FF)) {
 247                 if (bc_dev > bc_mem + 8) {
 248                         printk(KERN_ERR
 249                                "%s(%s): WARNING!! byte_count_dev %d "
 250                                "!= byte_count_mem %d\n",
 251                                __func__, drive->name, bc_dev, bc_mem);
 252                 }
 253         }
 254
 255         return dma_stat;
 256 }
 257
 258 static void sgiioc4_set_dma_mode(ide_drive_t *drive, const u8 speed)
 259 {
 260 }
 261
 262 /* Returns 1 if DMA IRQ issued, 0 otherwise */
 263 static int sgiioc4_dma_test_irq(ide_drive_t *drive)
 264 {
 265         return sgiioc4_checkirq(drive->hwif);
 266 }
 267
 268 static void sgiioc4_dma_host_set(ide_drive_t *drive, int on)
 269 {
 270         if (!on)
 271                 sgiioc4_clearirq(drive);
 272 }
 273
 274 static void sgiioc4_resetproc(ide_drive_t *drive)
 275 {
 276         struct ide_cmd *cmd = &drive->hwif->cmd;
 277
 278         sgiioc4_dma_end(drive);
 279         ide_dma_unmap_sg(drive, cmd);
 280         sgiioc4_clearirq(drive);
 281 }
 282
 283 static void sgiioc4_dma_lost_irq(ide_drive_t *drive)
 284 {
 285         sgiioc4_resetproc(drive);
 286
 287         ide_dma_lost_irq(drive);
 288 }
 289
 290 static u8 sgiioc4_read_status(ide_hwif_t *hwif)
 291 {
 292         unsigned long port = hwif->io_ports.status_addr;
 293         u8 reg = (u8) readb((void __iomem *) port);
 294
 295         if (!(reg & ATA_BUSY)) {        /* Not busy... check for interrupt */
 296                 unsigned long other_ir = port - 0x110;
 297                 unsigned int intr_reg = (u32) readl((void __iomem *) other_ir);
 298
 299                 /* Clear the Interrupt, Error bits on the IOC4 */
 300                 if (intr_reg & 0x03) {
 301                         writel(0x03, (void __iomem *) other_ir);
 302                         intr_reg = (u32) readl((void __iomem *) other_ir);
 303                 }
 304         }
 305
 306         return reg;
 307 }
 308
 309 /* Creates a DMA map for the scatter-gather list entries */
 310 static int __devinit ide_dma_sgiioc4(ide_hwif_t *hwif,
 311                                      const struct ide_port_info *d)
 312 {
 313         struct pci_dev *dev = to_pci_dev(hwif->dev);
 314         unsigned long dma_base = pci_resource_start(dev, 0) + IOC4_DMA_OFFSET;
 315         int num_ports = sizeof(struct ioc4_dma_regs);
 316         void *pad;
 317
 318         printk(KERN_INFO "    %s: MMIO-DMA\n", hwif->name);
 319
 320         if (request_mem_region(dma_base, num_ports, hwif->name) == NULL) {
 321                 printk(KERN_ERR "%s(%s) -- ERROR: addresses 0x%08lx to 0x%08lx "
 322                        "already in use\n", __func__, hwif->name,
 323                        dma_base, dma_base + num_ports - 1);
 324                 return -1;
 325         }
 326
 327         hwif->dma_base = (unsigned long)hwif->io_ports.irq_addr +
 328                          IOC4_DMA_OFFSET;
 329
 330         hwif->sg_max_nents = IOC4_PRD_ENTRIES;
 331
 332         hwif->prd_max_nents = IOC4_PRD_ENTRIES;
 333         hwif->prd_ent_size = IOC4_PRD_BYTES;
 334
 335         if (ide_allocate_dma_engine(hwif))
 336                 goto dma_pci_alloc_failure;
 337
 338         pad = pci_alloc_consistent(dev, IOC4_IDE_CACHELINE_SIZE,
 339                                    (dma_addr_t *)&hwif->extra_base);
 340         if (pad) {
 341                 ide_set_hwifdata(hwif, pad);
 342                 return 0;
 343         }
 344
 345         ide_release_dma_engine(hwif);
 346
 347         printk(KERN_ERR "%s(%s) -- ERROR: Unable to allocate DMA maps\n",
 348                __func__, hwif->name);
 349         printk(KERN_INFO "%s: changing from DMA to PIO mode", hwif->name);
 350
 351 dma_pci_alloc_failure:
 352         release_mem_region(dma_base, num_ports);
 353
 354         return -1;
 355 }
 356
 357 /* Initializes the IOC4 DMA Engine */
 358 static void sgiioc4_configure_for_dma(int dma_direction, ide_drive_t *drive)
 359 {
 360         u32 ioc4_dma;
 361         ide_hwif_t *hwif = drive->hwif;
 362         unsigned long dma_base = hwif->dma_base;
 363         unsigned long ioc4_dma_addr = dma_base + IOC4_DMA_CTRL * 4;
 364         u32 dma_addr, ending_dma_addr;
 365
 366         ioc4_dma = readl((void __iomem *)ioc4_dma_addr);
 367
 368         if (ioc4_dma & IOC4_S_DMA_ACTIVE) {
 369                 printk(KERN_WARNING "%s(%s): Warning!! DMA from previous "
 370                        "transfer was still active\n", __func__, drive->name);
 371                 writel(IOC4_S_DMA_STOP, (void __iomem *)ioc4_dma_addr);
 372                 ioc4_dma = sgiioc4_ide_dma_stop(hwif, dma_base);
 373
 374                 if (ioc4_dma & IOC4_S_DMA_STOP)
 375                         printk(KERN_ERR "%s(%s): IOC4 DMA STOP bit is "
 376                                "still 1\n", __func__, drive->name);
 377         }
 378
 379         ioc4_dma = readl((void __iomem *)ioc4_dma_addr);
 380         if (ioc4_dma & IOC4_S_DMA_ERROR) {
 381                 printk(KERN_WARNING "%s(%s): Warning!! DMA Error during "
 382                        "previous transfer, status 0x%x\n",
 383                        __func__, drive->name, ioc4_dma);
 384                 writel(IOC4_S_DMA_STOP, (void __iomem *)ioc4_dma_addr);
 385                 ioc4_dma = sgiioc4_ide_dma_stop(hwif, dma_base);
 386
 387                 if (ioc4_dma & IOC4_S_DMA_STOP)
 388                         printk(KERN_ERR "%s(%s): IOC4 DMA STOP bit is "
 389                                "still 1\n", __func__, drive->name);
 390         }
 391
 392         /* Address of the Scatter Gather List */
 393         dma_addr = cpu_to_le32(hwif->dmatable_dma);
 394         writel(dma_addr, (void __iomem *)(dma_base + IOC4_DMA_PTR_L * 4));
 395
 396         /* Address of the Ending DMA */
 397         memset(ide_get_hwifdata(hwif), 0, IOC4_IDE_CACHELINE_SIZE);
 398         ending_dma_addr = cpu_to_le32(hwif->extra_base);
 399         writel(ending_dma_addr, (void __iomem *)(dma_base +
 400                                                  IOC4_DMA_END_ADDR * 4));
 401
 402         writel(dma_direction, (void __iomem *)ioc4_dma_addr);
 403 }
 404
 405 /* IOC4 Scatter Gather list Format                                       */
 406 /* 128 Bit entries to support 64 bit addresses in the future             */
 407 /* The Scatter Gather list Entry should be in the BIG-ENDIAN Format      */
 408 /* --------------------------------------------------------------------- */
 409 /* | Upper 32 bits - Zero           |           Lower 32 bits- address | */
 410 /* --------------------------------------------------------------------- */
 411 /* | Upper 32 bits - Zero           |EOL| 15 unused     | 16 Bit Length| */
 412 /* --------------------------------------------------------------------- */
 413 /* Creates the scatter gather list, DMA Table                            */
 414
 415 static int sgiioc4_build_dmatable(ide_drive_t *drive, struct ide_cmd *cmd)
 416 {
 417         ide_hwif_t *hwif = drive->hwif;
 418         unsigned int *table = hwif->dmatable_cpu;
 419         unsigned int count = 0, i = cmd->sg_nents;
 420         struct scatterlist *sg = hwif->sg_table;
 421
 422         while (i && sg_dma_len(sg)) {
 423                 dma_addr_t cur_addr;
 424                 int cur_len;
 425                 cur_addr = sg_dma_address(sg);
 426                 cur_len = sg_dma_len(sg);
 427
 428                 while (cur_len) {
 429                         if (count++ >= IOC4_PRD_ENTRIES) {
 430                                 printk(KERN_WARNING
 431                                        "%s: DMA table too small\n",
 432                                        drive->name);
 433                                 return 0;
 434                         } else {
 435                                 u32 bcount =
 436                                     0x10000 - (cur_addr & 0xffff);
 437
 438                                 if (bcount > cur_len)
 439                                         bcount = cur_len;
 440
 441                                 /*
 442                                  * Put the address, length in
 443                                  * the IOC4 dma-table format
 444                                  */
 445                                 *table = 0x0;
 446                                 table++;
 447                                 *table = cpu_to_be32(cur_addr);
 448                                 table++;
 449                                 *table = 0x0;
 450                                 table++;
 451
 452                                 *table = cpu_to_be32(bcount);
 453                                 table++;
 454
 455                                 cur_addr += bcount;
 456                                 cur_len -= bcount;
 457                         }
 458                 }
 459
 460                 sg = sg_next(sg);
 461                 i--;
 462         }
 463
 464         if (count) {
 465                 table--;
 466                 *table |= cpu_to_be32(0x80000000);
 467                 return count;
 468         }
 469
 470         return 0;               /* revert to PIO for this request */
 471 }
 472
 473 static int sgiioc4_dma_setup(ide_drive_t *drive, struct ide_cmd *cmd)
 474 {
 475         int ddir;
 476         u8 write = !!(cmd->tf_flags & IDE_TFLAG_WRITE);
 477
 478         if (sgiioc4_build_dmatable(drive, cmd) == 0)
 479                 /* try PIO instead of DMA */
 480                 return 1;
 481
 482         if (write)
 483                 /* Writes TO the IOC4 FROM Main Memory */
 484                 ddir = IOC4_DMA_READ;
 485         else
 486                 /* Writes FROM the IOC4 TO Main Memory */
 487                 ddir = IOC4_DMA_WRITE;
 488
 489         sgiioc4_configure_for_dma(ddir, drive);
 490
 491         return 0;
 492 }
 493
 494 static const struct ide_tp_ops sgiioc4_tp_ops = {
 495         .exec_command           = ide_exec_command,
 496         .read_status            = sgiioc4_read_status,
 497         .read_altstatus         = ide_read_altstatus,
 498         .write_devctl           = ide_write_devctl,
 499
 500         .dev_select             = ide_dev_select,
 501         .tf_load                = ide_tf_load,
 502         .tf_read                = ide_tf_read,
 503
 504         .input_data             = ide_input_data,
 505         .output_data            = ide_output_data,
 506 };
 507
 508 static const struct ide_port_ops sgiioc4_port_ops = {
 509         .set_dma_mode           = sgiioc4_set_dma_mode,
 510         /* reset DMA engine, clear IRQs */
 511         .resetproc              = sgiioc4_resetproc,
 512 };
 513
 514 static const struct ide_dma_ops sgiioc4_dma_ops = {
 515         .dma_host_set           = sgiioc4_dma_host_set,
 516         .dma_setup              = sgiioc4_dma_setup,
 517         .dma_start              = sgiioc4_dma_start,
 518         .dma_end                = sgiioc4_dma_end,
 519         .dma_test_irq           = sgiioc4_dma_test_irq,
 520         .dma_lost_irq           = sgiioc4_dma_lost_irq,
 521 };
 522
 523 static const struct ide_port_info sgiioc4_port_info __devinitconst = {
 524         .name                   = DRV_NAME,
 525         .chipset                = ide_pci,
 526         .init_dma               = ide_dma_sgiioc4,
 527         .tp_ops                 = &sgiioc4_tp_ops,
 528         .port_ops               = &sgiioc4_port_ops,
 529         .dma_ops                = &sgiioc4_dma_ops,
 530         .host_flags             = IDE_HFLAG_MMIO,
 531         .irq_flags              = IRQF_SHARED,
 532         .mwdma_mask             = ATA_MWDMA2_ONLY,
 533 };
 534
 535 static int __devinit sgiioc4_ide_setup_pci_device(struct pci_dev *dev)
 536 {
 537         unsigned long cmd_base, irqport;
 538         unsigned long bar0, cmd_phys_base, ctl;
 539         void __iomem *virt_base;
 540         struct ide_hw hw, *hws[] = { &hw };
 541         int rc;
 542
 543         /* Get the CmdBlk and CtrlBlk base registers */
 544         bar0 = pci_resource_start(dev, 0);
 545         virt_base = pci_ioremap_bar(dev, 0);
 546         if (virt_base == NULL) {
 547                 printk(KERN_ERR "%s: Unable to remap BAR 0 address: 0x%lx\n",
 548                                 DRV_NAME, bar0);
 549                 return -ENOMEM;
 550         }
 551         cmd_base = (unsigned long)virt_base + IOC4_CMD_OFFSET;
 552         ctl = (unsigned long)virt_base + IOC4_CTRL_OFFSET;
 553         irqport = (unsigned long)virt_base + IOC4_INTR_OFFSET;
 554
 555         cmd_phys_base = bar0 + IOC4_CMD_OFFSET;
 556         if (request_mem_region(cmd_phys_base, IOC4_CMD_CTL_BLK_SIZE,
 557                                DRV_NAME) == NULL) {
 558                 printk(KERN_ERR "%s %s -- ERROR: addresses 0x%08lx to 0x%08lx "
 559                        "already in use\n", DRV_NAME, pci_name(dev),
 560                        cmd_phys_base, cmd_phys_base + IOC4_CMD_CTL_BLK_SIZE);
 561                 rc = -EBUSY;
 562                 goto req_mem_rgn_err;
 563         }
 564
 565         /* Initialize the IO registers */
 566         memset(&hw, 0, sizeof(hw));
 567         sgiioc4_init_hwif_ports(&hw, cmd_base, ctl, irqport);
 568         hw.irq = dev->irq;
 569         hw.dev = &dev->dev;
 570
 571         /* Initialize chipset IRQ registers */
 572         writel(0x03, (void __iomem *)(irqport + IOC4_INTR_SET * 4));
 573
 574         rc = ide_host_add(&sgiioc4_port_info, hws, 1, NULL);
 575         if (!rc)
 576                 return 0;
 577
 578         release_mem_region(cmd_phys_base, IOC4_CMD_CTL_BLK_SIZE);
 579 req_mem_rgn_err:
 580         iounmap(virt_base);
 581         return rc;
 582 }
 583
 584 static unsigned int __devinit pci_init_sgiioc4(struct pci_dev *dev)
 585 {
 586         int ret;
 587
 588         printk(KERN_INFO "%s: IDE controller at PCI slot %s, revision %d\n",
 589                          DRV_NAME, pci_name(dev), dev->revision);
 590
 591         if (dev->revision < IOC4_SUPPORTED_FIRMWARE_REV) {
 592                 printk(KERN_ERR "Skipping %s IDE controller in slot %s: "
 593                                 "firmware is obsolete - please upgrade to "
 594                                 "revision46 or higher\n",
 595                                 DRV_NAME, pci_name(dev));
 596                 ret = -EAGAIN;
 597                 goto out;
 598         }
 599         ret = sgiioc4_ide_setup_pci_device(dev);
 600 out:
 601         return ret;
 602 }
 603
 604 int __devinit ioc4_ide_attach_one(struct ioc4_driver_data *idd)
 605 {
 606         /*
 607          * PCI-RT does not bring out IDE connection.
 608          * Do not attach to this particular IOC4.
 609          */
 610         if (idd->idd_variant == IOC4_VARIANT_PCI_RT)
 611                 return 0;
 612
 613         return pci_init_sgiioc4(idd->idd_pdev);
 614 }
 615
 616 static struct ioc4_submodule __devinitdata ioc4_ide_submodule = {
 617         .is_name = "IOC4_ide",
 618         .is_owner = THIS_MODULE,
 619         .is_probe = ioc4_ide_attach_one,
 620 };
 621
 622 static int __init ioc4_ide_init(void)
 623 {
 624         return ioc4_register_submodule(&ioc4_ide_submodule);
 625 }
 626
 627 late_initcall(ioc4_ide_init); /* Call only after IDE init is done */
 628
 629 MODULE_AUTHOR("Aniket Malatpure/Jeremy Higdon");
 630 MODULE_DESCRIPTION("IDE PCI driver module for SGI IOC4 Base-IO Card");
 631 MODULE_LICENSE("GPL");