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 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 <asm/io.h>
  33
  34 #include <linux/ide.h>
  35
  36 #define DRV_NAME "SGIIOC4"
  37
  38 /* IOC4 Specific Definitions */
  39 #define IOC4_CMD_OFFSET         0x100
  40 #define IOC4_CTRL_OFFSET        0x120
  41 #define IOC4_DMA_OFFSET         0x140
  42 #define IOC4_INTR_OFFSET        0x0
  43
  44 #define IOC4_TIMING             0x00
  45 #define IOC4_DMA_PTR_L          0x01
  46 #define IOC4_DMA_PTR_H          0x02
  47 #define IOC4_DMA_ADDR_L         0x03
  48 #define IOC4_DMA_ADDR_H         0x04
  49 #define IOC4_BC_DEV             0x05
  50 #define IOC4_BC_MEM             0x06
  51 #define IOC4_DMA_CTRL           0x07
  52 #define IOC4_DMA_END_ADDR       0x08
  53
  54 /* Bits in the IOC4 Control/Status Register */
  55 #define IOC4_S_DMA_START        0x01
  56 #define IOC4_S_DMA_STOP         0x02
  57 #define IOC4_S_DMA_DIR          0x04
  58 #define IOC4_S_DMA_ACTIVE       0x08
  59 #define IOC4_S_DMA_ERROR        0x10
  60 #define IOC4_ATA_MEMERR         0x02
  61
  62 /* Read/Write Directions */
  63 #define IOC4_DMA_WRITE          0x04
  64 #define IOC4_DMA_READ           0x00
  65
  66 /* Interrupt Register Offsets */
  67 #define IOC4_INTR_REG           0x03
  68 #define IOC4_INTR_SET           0x05
  69 #define IOC4_INTR_CLEAR         0x07
  70
  71 #define IOC4_IDE_CACHELINE_SIZE 128
  72 #define IOC4_CMD_CTL_BLK_SIZE   0x20
  73 #define IOC4_SUPPORTED_FIRMWARE_REV 46
  74
  75 typedef struct {
  76         u32 timing_reg0;
  77         u32 timing_reg1;
  78         u32 low_mem_ptr;
  79         u32 high_mem_ptr;
  80         u32 low_mem_addr;
  81         u32 high_mem_addr;
  82         u32 dev_byte_count;
  83         u32 mem_byte_count;
  84         u32 status;
  85 } ioc4_dma_regs_t;
  86
  87 /* Each Physical Region Descriptor Entry size is 16 bytes (2 * 64 bits) */
  88 /* IOC4 has only 1 IDE channel */
  89 #define IOC4_PRD_BYTES       16
  90 #define IOC4_PRD_ENTRIES     (PAGE_SIZE /(4*IOC4_PRD_BYTES))
  91
  92
  93 static void
  94 sgiioc4_init_hwif_ports(hw_regs_t * hw, unsigned long data_port,
  95                         unsigned long ctrl_port, 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
 109 sgiioc4_checkirq(ide_hwif_t * hwif)
 110 {
 111         unsigned long intr_addr =
 112                 hwif->io_ports.irq_addr + IOC4_INTR_REG * 4;
 113
 114         if ((u8)readl((void __iomem *)intr_addr) & 0x03)
 115                 return 1;
 116
 117         return 0;
 118 }
 119
 120 static u8 sgiioc4_read_status(ide_hwif_t *);
 121
 122 static int
 123 sgiioc4_clearirq(ide_drive_t * drive)
 124 {
 125         u32 intr_reg;
 126         ide_hwif_t *hwif = drive->hwif;
 127         struct ide_io_ports *io_ports = &hwif->io_ports;
 128         unsigned long other_ir = io_ports->irq_addr + (IOC4_INTR_REG << 2);
 129
 130         /* Code to check for PCI error conditions */
 131         intr_reg = readl((void __iomem *)other_ir);
 132         if (intr_reg & 0x03) { /* Valid IOC4-IDE interrupt */
 133                 /*
 134                  * Using sgiioc4_read_status to read the Status register has a
 135                  * side effect of clearing the interrupt.  The first read should
 136                  * clear it if it is set.  The second read should return
 137                  * a "clear" status if it got cleared.  If not, then spin
 138                  * for a bit trying to clear it.
 139                  */
 140                 u8 stat = sgiioc4_read_status(hwif);
 141                 int count = 0;
 142
 143                 stat = sgiioc4_read_status(hwif);
 144                 while ((stat & ATA_BUSY) && (count++ < 100)) {
 145                         udelay(1);
 146                         stat = sgiioc4_read_status(hwif);
 147                 }
 148
 149                 if (intr_reg & 0x02) {
 150                         struct pci_dev *dev = to_pci_dev(hwif->dev);
 151                         /* Error when transferring DMA data on PCI bus */
 152                         u32 pci_err_addr_low, pci_err_addr_high,
 153                             pci_stat_cmd_reg;
 154
 155                         pci_err_addr_low =
 156                                 readl((void __iomem *)io_ports->irq_addr);
 157                         pci_err_addr_high =
 158                                 readl((void __iomem *)(io_ports->irq_addr + 4));
 159                         pci_read_config_dword(dev, PCI_COMMAND,
 160                                               &pci_stat_cmd_reg);
 161                         printk(KERN_ERR
 162                                "%s(%s) : PCI Bus Error when doing DMA:"
 163                                    " status-cmd reg is 0x%x\n",
 164                                __func__, drive->name, pci_stat_cmd_reg);
 165                         printk(KERN_ERR
 166                                "%s(%s) : PCI Error Address is 0x%x%x\n",
 167                                __func__, drive->name,
 168                                pci_err_addr_high, pci_err_addr_low);
 169                         /* Clear the PCI Error indicator */
 170                         pci_write_config_dword(dev, PCI_COMMAND, 0x00000146);
 171                 }
 172
 173                 /* Clear the Interrupt, Error bits on the IOC4 */
 174                 writel(0x03, (void __iomem *)other_ir);
 175
 176                 intr_reg = readl((void __iomem *)other_ir);
 177         }
 178
 179         return intr_reg & 3;
 180 }
 181
 182 static void sgiioc4_dma_start(ide_drive_t *drive)
 183 {
 184         ide_hwif_t *hwif = drive->hwif;
 185         unsigned long ioc4_dma_addr = hwif->dma_base + IOC4_DMA_CTRL * 4;
 186         unsigned int reg = readl((void __iomem *)ioc4_dma_addr);
 187         unsigned int temp_reg = reg | IOC4_S_DMA_START;
 188
 189         writel(temp_reg, (void __iomem *)ioc4_dma_addr);
 190 }
 191
 192 static u32
 193 sgiioc4_ide_dma_stop(ide_hwif_t *hwif, u64 dma_base)
 194 {
 195         unsigned long ioc4_dma_addr = dma_base + IOC4_DMA_CTRL * 4;
 196         u32     ioc4_dma;
 197         int     count;
 198
 199         count = 0;
 200         ioc4_dma = readl((void __iomem *)ioc4_dma_addr);
 201         while ((ioc4_dma & IOC4_S_DMA_STOP) && (count++ < 200)) {
 202                 udelay(1);
 203                 ioc4_dma = readl((void __iomem *)ioc4_dma_addr);
 204         }
 205         return ioc4_dma;
 206 }
 207
 208 /* Stops the IOC4 DMA Engine */
 209 static int sgiioc4_dma_end(ide_drive_t *drive)
 210 {
 211         u32 ioc4_dma, bc_dev, bc_mem, num, valid = 0, cnt = 0;
 212         ide_hwif_t *hwif = drive->hwif;
 213         unsigned long dma_base = hwif->dma_base;
 214         int dma_stat = 0;
 215         unsigned long *ending_dma = ide_get_hwifdata(hwif);
 216
 217         writel(IOC4_S_DMA_STOP, (void __iomem *)(dma_base + IOC4_DMA_CTRL * 4));
 218
 219         ioc4_dma = sgiioc4_ide_dma_stop(hwif, dma_base);
 220
 221         if (ioc4_dma & IOC4_S_DMA_STOP) {
 222                 printk(KERN_ERR
 223                        "%s(%s): IOC4 DMA STOP bit is still 1 :"
 224                        "ioc4_dma_reg 0x%x\n",
 225                        __func__, drive->name, ioc4_dma);
 226                 dma_stat = 1;
 227         }
 228
 229         /*
 230          * The IOC4 will DMA 1's to the ending dma area to indicate that
 231          * previous data DMA is complete.  This is necessary because of relaxed
 232          * ordering between register reads and DMA writes on the Altix.
 233          */
 234         while ((cnt++ < 200) && (!valid)) {
 235                 for (num = 0; num < 16; num++) {
 236                         if (ending_dma[num]) {
 237                                 valid = 1;
 238                                 break;
 239                         }
 240                 }
 241                 udelay(1);
 242         }
 243         if (!valid) {
 244                 printk(KERN_ERR "%s(%s) : DMA incomplete\n", __func__,
 245                        drive->name);
 246                 dma_stat = 1;
 247         }
 248
 249         bc_dev = readl((void __iomem *)(dma_base + IOC4_BC_DEV * 4));
 250         bc_mem = readl((void __iomem *)(dma_base + IOC4_BC_MEM * 4));
 251
 252         if ((bc_dev & 0x01FF) || (bc_mem & 0x1FF)) {
 253                 if (bc_dev > bc_mem + 8) {
 254                         printk(KERN_ERR
 255                                "%s(%s): WARNING!! byte_count_dev %d "
 256                                "!= byte_count_mem %d\n",
 257                                __func__, drive->name, bc_dev, bc_mem);
 258                 }
 259         }
 260
 261         return dma_stat;
 262 }
 263
 264 static void sgiioc4_set_dma_mode(ide_drive_t *drive, const u8 speed)
 265 {
 266 }
 267
 268 /* returns 1 if dma irq issued, 0 otherwise */
 269 static int sgiioc4_dma_test_irq(ide_drive_t *drive)
 270 {
 271         return sgiioc4_checkirq(drive->hwif);
 272 }
 273
 274 static void sgiioc4_dma_host_set(ide_drive_t *drive, int on)
 275 {
 276         if (!on)
 277                 sgiioc4_clearirq(drive);
 278 }
 279
 280 static void sgiioc4_resetproc(ide_drive_t *drive)
 281 {
 282         struct ide_cmd *cmd = &drive->hwif->cmd;
 283
 284         sgiioc4_dma_end(drive);
 285         ide_dma_unmap_sg(drive, cmd);
 286         sgiioc4_clearirq(drive);
 287 }
 288
 289 static void
 290 sgiioc4_dma_lost_irq(ide_drive_t * drive)
 291 {
 292         sgiioc4_resetproc(drive);
 293
 294         ide_dma_lost_irq(drive);
 295 }
 296
 297 static u8 sgiioc4_read_status(ide_hwif_t *hwif)
 298 {
 299         unsigned long port = hwif->io_ports.status_addr;
 300         u8 reg = (u8) readb((void __iomem *) port);
 301
 302         if (!(reg & ATA_BUSY)) {        /* Not busy... check for interrupt */
 303                 unsigned long other_ir = port - 0x110;
 304                 unsigned int intr_reg = (u32) readl((void __iomem *) other_ir);
 305
 306                 /* Clear the Interrupt, Error bits on the IOC4 */
 307                 if (intr_reg & 0x03) {
 308                         writel(0x03, (void __iomem *) other_ir);
 309                         intr_reg = (u32) readl((void __iomem *) other_ir);
 310                 }
 311         }
 312
 313         return reg;
 314 }
 315
 316 /* Creates a dma map for the scatter-gather list entries */
 317 static int __devinit
 318 ide_dma_sgiioc4(ide_hwif_t *hwif, const struct ide_port_info *d)
 319 {
 320         struct pci_dev *dev = to_pci_dev(hwif->dev);
 321         unsigned long dma_base = pci_resource_start(dev, 0) + IOC4_DMA_OFFSET;
 322         int num_ports = sizeof (ioc4_dma_regs_t);
 323         void *pad;
 324
 325         printk(KERN_INFO "    %s: MMIO-DMA\n", hwif->name);
 326
 327         if (request_mem_region(dma_base, num_ports, hwif->name) == NULL) {
 328                 printk(KERN_ERR "%s(%s) -- ERROR: addresses 0x%08lx to 0x%08lx "
 329                        "already in use\n", __func__, hwif->name,
 330                        dma_base, dma_base + num_ports - 1);
 331                 return -1;
 332         }
 333
 334         hwif->dma_base = (unsigned long)hwif->io_ports.irq_addr +
 335                          IOC4_DMA_OFFSET;
 336
 337         hwif->sg_max_nents = IOC4_PRD_ENTRIES;
 338
 339         hwif->prd_max_nents = IOC4_PRD_ENTRIES;
 340         hwif->prd_ent_size = IOC4_PRD_BYTES;
 341
 342         if (ide_allocate_dma_engine(hwif))
 343                 goto dma_pci_alloc_failure;
 344
 345         pad = pci_alloc_consistent(dev, IOC4_IDE_CACHELINE_SIZE,
 346                                    (dma_addr_t *)&hwif->extra_base);
 347         if (pad) {
 348                 ide_set_hwifdata(hwif, pad);
 349                 return 0;
 350         }
 351
 352         ide_release_dma_engine(hwif);
 353
 354         printk(KERN_ERR "%s(%s) -- ERROR: Unable to allocate DMA maps\n",
 355                __func__, hwif->name);
 356         printk(KERN_INFO "%s: changing from DMA to PIO mode", hwif->name);
 357
 358 dma_pci_alloc_failure:
 359         release_mem_region(dma_base, num_ports);
 360
 361         return -1;
 362 }
 363
 364 /* Initializes the IOC4 DMA Engine */
 365 static void
 366 sgiioc4_configure_for_dma(int dma_direction, ide_drive_t * drive)
 367 {
 368         u32 ioc4_dma;
 369         ide_hwif_t *hwif = drive->hwif;
 370         unsigned long dma_base = hwif->dma_base;
 371         unsigned long ioc4_dma_addr = dma_base + IOC4_DMA_CTRL * 4;
 372         u32 dma_addr, ending_dma_addr;
 373
 374         ioc4_dma = readl((void __iomem *)ioc4_dma_addr);
 375
 376         if (ioc4_dma & IOC4_S_DMA_ACTIVE) {
 377                 printk(KERN_WARNING
 378                         "%s(%s):Warning!! DMA from previous transfer was still active\n",
 379                        __func__, drive->name);
 380                 writel(IOC4_S_DMA_STOP, (void __iomem *)ioc4_dma_addr);
 381                 ioc4_dma = sgiioc4_ide_dma_stop(hwif, dma_base);
 382
 383                 if (ioc4_dma & IOC4_S_DMA_STOP)
 384                         printk(KERN_ERR
 385                                "%s(%s) : IOC4 Dma STOP bit is still 1\n",
 386                                __func__, drive->name);
 387         }
 388
 389         ioc4_dma = readl((void __iomem *)ioc4_dma_addr);
 390         if (ioc4_dma & IOC4_S_DMA_ERROR) {
 391                 printk(KERN_WARNING
 392                        "%s(%s) : Warning!! - DMA Error during Previous"
 393                        " transfer | status 0x%x\n",
 394                        __func__, drive->name, ioc4_dma);
 395                 writel(IOC4_S_DMA_STOP, (void __iomem *)ioc4_dma_addr);
 396                 ioc4_dma = sgiioc4_ide_dma_stop(hwif, dma_base);
 397
 398                 if (ioc4_dma & IOC4_S_DMA_STOP)
 399                         printk(KERN_ERR
 400                                "%s(%s) : IOC4 DMA STOP bit is still 1\n",
 401                                __func__, drive->name);
 402         }
 403
 404         /* Address of the Scatter Gather List */
 405         dma_addr = cpu_to_le32(hwif->dmatable_dma);
 406         writel(dma_addr, (void __iomem *)(dma_base + IOC4_DMA_PTR_L * 4));
 407
 408         /* Address of the Ending DMA */
 409         memset(ide_get_hwifdata(hwif), 0, IOC4_IDE_CACHELINE_SIZE);
 410         ending_dma_addr = cpu_to_le32(hwif->extra_base);
 411         writel(ending_dma_addr, (void __iomem *)(dma_base + IOC4_DMA_END_ADDR * 4));
 412
 413         writel(dma_direction, (void __iomem *)ioc4_dma_addr);
 414 }
 415
 416 /* IOC4 Scatter Gather list Format                                       */
 417 /* 128 Bit entries to support 64 bit addresses in the future             */
 418 /* The Scatter Gather list Entry should be in the BIG-ENDIAN Format      */
 419 /* --------------------------------------------------------------------- */
 420 /* | Upper 32 bits - Zero           |           Lower 32 bits- address | */
 421 /* --------------------------------------------------------------------- */
 422 /* | Upper 32 bits - Zero           |EOL| 15 unused     | 16 Bit Length| */
 423 /* --------------------------------------------------------------------- */
 424 /* Creates the scatter gather list, DMA Table */
 425 static int sgiioc4_build_dmatable(ide_drive_t *drive, struct ide_cmd *cmd)
 426 {
 427         ide_hwif_t *hwif = drive->hwif;
 428         unsigned int *table = hwif->dmatable_cpu;
 429         unsigned int count = 0, i = cmd->sg_nents;
 430         struct scatterlist *sg = hwif->sg_table;
 431
 432         while (i && sg_dma_len(sg)) {
 433                 dma_addr_t cur_addr;
 434                 int cur_len;
 435                 cur_addr = sg_dma_address(sg);
 436                 cur_len = sg_dma_len(sg);
 437
 438                 while (cur_len) {
 439                         if (count++ >= IOC4_PRD_ENTRIES) {
 440                                 printk(KERN_WARNING
 441                                        "%s: DMA table too small\n",
 442                                        drive->name);
 443                                 return 0;
 444                         } else {
 445                                 u32 bcount =
 446                                     0x10000 - (cur_addr & 0xffff);
 447
 448                                 if (bcount > cur_len)
 449                                         bcount = cur_len;
 450
 451                                 /* put the addr, length in
 452                                  * the IOC4 dma-table format */
 453                                 *table = 0x0;
 454                                 table++;
 455                                 *table = cpu_to_be32(cur_addr);
 456                                 table++;
 457                                 *table = 0x0;
 458                                 table++;
 459
 460                                 *table = cpu_to_be32(bcount);
 461                                 table++;
 462
 463                                 cur_addr += bcount;
 464                                 cur_len -= bcount;
 465                         }
 466                 }
 467
 468                 sg = sg_next(sg);
 469                 i--;
 470         }
 471
 472         if (count) {
 473                 table--;
 474                 *table |= cpu_to_be32(0x80000000);
 475                 return count;
 476         }
 477
 478         return 0;               /* revert to PIO for this request */
 479 }
 480
 481 static int sgiioc4_dma_setup(ide_drive_t *drive, struct ide_cmd *cmd)
 482 {
 483         int ddir;
 484         u8 write = !!(cmd->tf_flags & IDE_TFLAG_WRITE);
 485
 486         if (sgiioc4_build_dmatable(drive, cmd) == 0)
 487                 /* try PIO instead of DMA */
 488                 return 1;
 489
 490         if (write)
 491                 /* Writes TO the IOC4 FROM Main Memory */
 492                 ddir = IOC4_DMA_READ;
 493         else
 494                 /* Writes FROM the IOC4 TO Main Memory */
 495                 ddir = IOC4_DMA_WRITE;
 496
 497         sgiioc4_configure_for_dma(ddir, drive);
 498
 499         return 0;
 500 }
 501
 502 static const struct ide_tp_ops sgiioc4_tp_ops = {
 503         .exec_command           = ide_exec_command,
 504         .read_status            = sgiioc4_read_status,
 505         .read_altstatus         = ide_read_altstatus,
 506
 507         .set_irq                = ide_set_irq,
 508
 509         .tf_load                = ide_tf_load,
 510         .tf_read                = ide_tf_read,
 511
 512         .input_data             = ide_input_data,
 513         .output_data            = ide_output_data,
 514 };
 515
 516 static const struct ide_port_ops sgiioc4_port_ops = {
 517         .set_dma_mode           = sgiioc4_set_dma_mode,
 518         /* reset DMA engine, clear IRQs */
 519         .resetproc              = sgiioc4_resetproc,
 520 };
 521
 522 static const struct ide_dma_ops sgiioc4_dma_ops = {
 523         .dma_host_set           = sgiioc4_dma_host_set,
 524         .dma_setup              = sgiioc4_dma_setup,
 525         .dma_start              = sgiioc4_dma_start,
 526         .dma_end                = sgiioc4_dma_end,
 527         .dma_test_irq           = sgiioc4_dma_test_irq,
 528         .dma_lost_irq           = sgiioc4_dma_lost_irq,
 529 };
 530
 531 static const struct ide_port_info sgiioc4_port_info __devinitconst = {
 532         .name                   = DRV_NAME,
 533         .chipset                = ide_pci,
 534         .init_dma               = ide_dma_sgiioc4,
 535         .tp_ops                 = &sgiioc4_tp_ops,
 536         .port_ops               = &sgiioc4_port_ops,
 537         .dma_ops                = &sgiioc4_dma_ops,
 538         .host_flags             = IDE_HFLAG_MMIO,
 539         .irq_flags              = IRQF_SHARED,
 540         .mwdma_mask             = ATA_MWDMA2_ONLY,
 541 };
 542
 543 static int __devinit
 544 sgiioc4_ide_setup_pci_device(struct pci_dev *dev)
 545 {
 546         unsigned long cmd_base, irqport;
 547         unsigned long bar0, cmd_phys_base, ctl;
 548         void __iomem *virt_base;
 549         hw_regs_t hw, *hws[] = { &hw, NULL, NULL, NULL };
 550         int rc;
 551
 552         /*  Get the CmdBlk and CtrlBlk Base Registers */
 553         bar0 = pci_resource_start(dev, 0);
 554         virt_base = pci_ioremap_bar(dev, 0);
 555         if (virt_base == NULL) {
 556                 printk(KERN_ERR "%s: Unable to remap BAR 0 address: 0x%lx\n",
 557                                 DRV_NAME, bar0);
 558                 return -ENOMEM;
 559         }
 560         cmd_base = (unsigned long) virt_base + IOC4_CMD_OFFSET;
 561         ctl = (unsigned long) virt_base + IOC4_CTRL_OFFSET;
 562         irqport = (unsigned long) virt_base + IOC4_INTR_OFFSET;
 563
 564         cmd_phys_base = bar0 + IOC4_CMD_OFFSET;
 565         if (request_mem_region(cmd_phys_base, IOC4_CMD_CTL_BLK_SIZE,
 566                                DRV_NAME) == NULL) {
 567                 printk(KERN_ERR "%s %s -- ERROR: addresses 0x%08lx to 0x%08lx "
 568                        "already in use\n", DRV_NAME, pci_name(dev),
 569                        cmd_phys_base, cmd_phys_base + IOC4_CMD_CTL_BLK_SIZE);
 570                 rc = -EBUSY;
 571                 goto req_mem_rgn_err;
 572         }
 573
 574         /* Initialize the IO registers */
 575         memset(&hw, 0, sizeof(hw));
 576         sgiioc4_init_hwif_ports(&hw, cmd_base, ctl, irqport);
 577         hw.irq = dev->irq;
 578         hw.chipset = ide_pci;
 579         hw.dev = &dev->dev;
 580
 581         /* Initializing chipset IRQ Registers */
 582         writel(0x03, (void __iomem *)(irqport + IOC4_INTR_SET * 4));
 583
 584         rc = ide_host_add(&sgiioc4_port_info, hws, NULL);
 585         if (!rc)
 586                 return 0;
 587
 588         release_mem_region(cmd_phys_base, IOC4_CMD_CTL_BLK_SIZE);
 589 req_mem_rgn_err:
 590         iounmap(virt_base);
 591         return rc;
 592 }
 593
 594 static unsigned int __devinit
 595 pci_init_sgiioc4(struct pci_dev *dev)
 596 {
 597         int ret;
 598
 599         printk(KERN_INFO "%s: IDE controller at PCI slot %s, revision %d\n",
 600                          DRV_NAME, pci_name(dev), dev->revision);
 601
 602         if (dev->revision < IOC4_SUPPORTED_FIRMWARE_REV) {
 603                 printk(KERN_ERR "Skipping %s IDE controller in slot %s: "
 604                                 "firmware is obsolete - please upgrade to "
 605                                 "revision46 or higher\n",
 606                                 DRV_NAME, pci_name(dev));
 607                 ret = -EAGAIN;
 608                 goto out;
 609         }
 610         ret = sgiioc4_ide_setup_pci_device(dev);
 611 out:
 612         return ret;
 613 }
 614
 615 int __devinit
 616 ioc4_ide_attach_one(struct ioc4_driver_data *idd)
 617 {
 618         /* PCI-RT does not bring out IDE connection.
 619          * Do not attach to this particular IOC4.
 620          */
 621         if (idd->idd_variant == IOC4_VARIANT_PCI_RT)
 622                 return 0;
 623
 624         return pci_init_sgiioc4(idd->idd_pdev);
 625 }
 626
 627 static struct ioc4_submodule __devinitdata ioc4_ide_submodule = {
 628         .is_name = "IOC4_ide",
 629         .is_owner = THIS_MODULE,
 630         .is_probe = ioc4_ide_attach_one,
 631 /*      .is_remove = ioc4_ide_remove_one,       */
 632 };
 633
 634 static int __init ioc4_ide_init(void)
 635 {
 636         return ioc4_register_submodule(&ioc4_ide_submodule);
 637 }
 638
 639 late_initcall(ioc4_ide_init); /* Call only after IDE init is done */
 640
 641 MODULE_AUTHOR("Aniket Malatpure/Jeremy Higdon");
 642 MODULE_DESCRIPTION("IDE PCI driver module for SGI IOC4 Base-IO Card");
 643 MODULE_LICENSE("GPL");