drivers/ide/pci/sgiioc4.c

   1 /*
   2  * Copyright (c) 2003-2006 Silicon Graphics, Inc.  All Rights Reserved.
   3  *
   4  * This program is free software; you can redistribute it and/or modify it
   5  * under the terms of version 2 of the GNU General Public License
   6  * as published by the Free Software Foundation.
   7  *
   8  * This program is distributed in the hope that it would be useful, but
   9  * WITHOUT ANY WARRANTY; without even the implied warranty of
  10  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
  11  *
  12  * You should have received a copy of the GNU General Public
  13  * License along with this program; if not, write the Free Software
  14  * Foundation, Inc., 59 Temple Place - Suite 330, Boston MA 02111-1307, USA.
  15  *
  16  * For further information regarding this notice, see:
  17  *
  18  * http://oss.sgi.com/projects/GenInfo/NoticeExplan
  19  */
  20
  21 #include <linux/module.h>
  22 #include <linux/types.h>
  23 #include <linux/pci.h>
  24 #include <linux/delay.h>
  25 #include <linux/hdreg.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         if (ctrl_port)
 105                 hw->io_ports.ctl_addr = ctrl_port;
 106
 107         if (irq_port)
 108                 hw->io_ports.irq_addr = irq_port;
 109 }
 110
 111 static void
 112 sgiioc4_maskproc(ide_drive_t * drive, int mask)
 113 {
 114         writeb(ATA_DEVCTL_OBS | (mask ? 2 : 0),
 115                (void __iomem *)drive->hwif->io_ports.ctl_addr);
 116 }
 117
 118 static int
 119 sgiioc4_checkirq(ide_hwif_t * hwif)
 120 {
 121         unsigned long intr_addr =
 122                 hwif->io_ports.irq_addr + IOC4_INTR_REG * 4;
 123
 124         if ((u8)readl((void __iomem *)intr_addr) & 0x03)
 125                 return 1;
 126
 127         return 0;
 128 }
 129
 130 static u8 sgiioc4_read_status(ide_hwif_t *);
 131
 132 static int
 133 sgiioc4_clearirq(ide_drive_t * drive)
 134 {
 135         u32 intr_reg;
 136         ide_hwif_t *hwif = HWIF(drive);
 137         struct ide_io_ports *io_ports = &hwif->io_ports;
 138         unsigned long other_ir = io_ports->irq_addr + (IOC4_INTR_REG << 2);
 139
 140         /* Code to check for PCI error conditions */
 141         intr_reg = readl((void __iomem *)other_ir);
 142         if (intr_reg & 0x03) { /* Valid IOC4-IDE interrupt */
 143                 /*
 144                  * Using sgiioc4_read_status to read the Status register has a
 145                  * side effect of clearing the interrupt.  The first read should
 146                  * clear it if it is set.  The second read should return
 147                  * a "clear" status if it got cleared.  If not, then spin
 148                  * for a bit trying to clear it.
 149                  */
 150                 u8 stat = sgiioc4_read_status(hwif);
 151                 int count = 0;
 152
 153                 stat = sgiioc4_read_status(hwif);
 154                 while ((stat & 0x80) && (count++ < 100)) {
 155                         udelay(1);
 156                         stat = sgiioc4_read_status(hwif);
 157                 }
 158
 159                 if (intr_reg & 0x02) {
 160                         struct pci_dev *dev = to_pci_dev(hwif->dev);
 161                         /* Error when transferring DMA data on PCI bus */
 162                         u32 pci_err_addr_low, pci_err_addr_high,
 163                             pci_stat_cmd_reg;
 164
 165                         pci_err_addr_low =
 166                                 readl((void __iomem *)io_ports->irq_addr);
 167                         pci_err_addr_high =
 168                                 readl((void __iomem *)(io_ports->irq_addr + 4));
 169                         pci_read_config_dword(dev, PCI_COMMAND,
 170                                               &pci_stat_cmd_reg);
 171                         printk(KERN_ERR
 172                                "%s(%s) : PCI Bus Error when doing DMA:"
 173                                    " status-cmd reg is 0x%x\n",
 174                                __func__, drive->name, pci_stat_cmd_reg);
 175                         printk(KERN_ERR
 176                                "%s(%s) : PCI Error Address is 0x%x%x\n",
 177                                __func__, drive->name,
 178                                pci_err_addr_high, pci_err_addr_low);
 179                         /* Clear the PCI Error indicator */
 180                         pci_write_config_dword(dev, PCI_COMMAND, 0x00000146);
 181                 }
 182
 183                 /* Clear the Interrupt, Error bits on the IOC4 */
 184                 writel(0x03, (void __iomem *)other_ir);
 185
 186                 intr_reg = readl((void __iomem *)other_ir);
 187         }
 188
 189         return intr_reg & 3;
 190 }
 191
 192 static void sgiioc4_dma_start(ide_drive_t *drive)
 193 {
 194         ide_hwif_t *hwif = HWIF(drive);
 195         unsigned long ioc4_dma_addr = hwif->dma_base + IOC4_DMA_CTRL * 4;
 196         unsigned int reg = readl((void __iomem *)ioc4_dma_addr);
 197         unsigned int temp_reg = reg | IOC4_S_DMA_START;
 198
 199         writel(temp_reg, (void __iomem *)ioc4_dma_addr);
 200 }
 201
 202 static u32
 203 sgiioc4_ide_dma_stop(ide_hwif_t *hwif, u64 dma_base)
 204 {
 205         unsigned long ioc4_dma_addr = dma_base + IOC4_DMA_CTRL * 4;
 206         u32     ioc4_dma;
 207         int     count;
 208
 209         count = 0;
 210         ioc4_dma = readl((void __iomem *)ioc4_dma_addr);
 211         while ((ioc4_dma & IOC4_S_DMA_STOP) && (count++ < 200)) {
 212                 udelay(1);
 213                 ioc4_dma = readl((void __iomem *)ioc4_dma_addr);
 214         }
 215         return ioc4_dma;
 216 }
 217
 218 /* Stops the IOC4 DMA Engine */
 219 static int sgiioc4_dma_end(ide_drive_t *drive)
 220 {
 221         u32 ioc4_dma, bc_dev, bc_mem, num, valid = 0, cnt = 0;
 222         ide_hwif_t *hwif = HWIF(drive);
 223         unsigned long dma_base = hwif->dma_base;
 224         int dma_stat = 0;
 225         unsigned long *ending_dma = ide_get_hwifdata(hwif);
 226
 227         writel(IOC4_S_DMA_STOP, (void __iomem *)(dma_base + IOC4_DMA_CTRL * 4));
 228
 229         ioc4_dma = sgiioc4_ide_dma_stop(hwif, dma_base);
 230
 231         if (ioc4_dma & IOC4_S_DMA_STOP) {
 232                 printk(KERN_ERR
 233                        "%s(%s): IOC4 DMA STOP bit is still 1 :"
 234                        "ioc4_dma_reg 0x%x\n",
 235                        __func__, drive->name, ioc4_dma);
 236                 dma_stat = 1;
 237         }
 238
 239         /*
 240          * The IOC4 will DMA 1's to the ending dma area to indicate that
 241          * previous data DMA is complete.  This is necessary because of relaxed
 242          * ordering between register reads and DMA writes on the Altix.
 243          */
 244         while ((cnt++ < 200) && (!valid)) {
 245                 for (num = 0; num < 16; num++) {
 246                         if (ending_dma[num]) {
 247                                 valid = 1;
 248                                 break;
 249                         }
 250                 }
 251                 udelay(1);
 252         }
 253         if (!valid) {
 254                 printk(KERN_ERR "%s(%s) : DMA incomplete\n", __func__,
 255                        drive->name);
 256                 dma_stat = 1;
 257         }
 258
 259         bc_dev = readl((void __iomem *)(dma_base + IOC4_BC_DEV * 4));
 260         bc_mem = readl((void __iomem *)(dma_base + IOC4_BC_MEM * 4));
 261
 262         if ((bc_dev & 0x01FF) || (bc_mem & 0x1FF)) {
 263                 if (bc_dev > bc_mem + 8) {
 264                         printk(KERN_ERR
 265                                "%s(%s): WARNING!! byte_count_dev %d "
 266                                "!= byte_count_mem %d\n",
 267                                __func__, drive->name, bc_dev, bc_mem);
 268                 }
 269         }
 270
 271         drive->waiting_for_dma = 0;
 272         ide_destroy_dmatable(drive);
 273
 274         return dma_stat;
 275 }
 276
 277 static void sgiioc4_set_dma_mode(ide_drive_t *drive, const u8 speed)
 278 {
 279 }
 280
 281 /* returns 1 if dma irq issued, 0 otherwise */
 282 static int sgiioc4_dma_test_irq(ide_drive_t *drive)
 283 {
 284         return sgiioc4_checkirq(HWIF(drive));
 285 }
 286
 287 static void sgiioc4_dma_host_set(ide_drive_t *drive, int on)
 288 {
 289         if (!on)
 290                 sgiioc4_clearirq(drive);
 291 }
 292
 293 static void
 294 sgiioc4_resetproc(ide_drive_t * drive)
 295 {
 296         sgiioc4_dma_end(drive);
 297         sgiioc4_clearirq(drive);
 298 }
 299
 300 static void
 301 sgiioc4_dma_lost_irq(ide_drive_t * drive)
 302 {
 303         sgiioc4_resetproc(drive);
 304
 305         ide_dma_lost_irq(drive);
 306 }
 307
 308 static u8 sgiioc4_read_status(ide_hwif_t *hwif)
 309 {
 310         unsigned long port = hwif->io_ports.status_addr;
 311         u8 reg = (u8) readb((void __iomem *) port);
 312
 313         if ((port & 0xFFF) == 0x11C) {  /* Status register of IOC4 */
 314                 if (reg & 0x51) {       /* Not busy...check for interrupt */
 315                         unsigned long other_ir = port - 0x110;
 316                         unsigned int intr_reg = (u32) readl((void __iomem *) other_ir);
 317
 318                         /* Clear the Interrupt, Error bits on the IOC4 */
 319                         if (intr_reg & 0x03) {
 320                                 writel(0x03, (void __iomem *) other_ir);
 321                                 intr_reg = (u32) readl((void __iomem *) other_ir);
 322                         }
 323                 }
 324         }
 325
 326         return reg;
 327 }
 328
 329 /* Creates a dma map for the scatter-gather list entries */
 330 static int __devinit
 331 ide_dma_sgiioc4(ide_hwif_t *hwif, const struct ide_port_info *d)
 332 {
 333         struct pci_dev *dev = to_pci_dev(hwif->dev);
 334         unsigned long dma_base = pci_resource_start(dev, 0) + IOC4_DMA_OFFSET;
 335         void __iomem *virt_dma_base;
 336         int num_ports = sizeof (ioc4_dma_regs_t);
 337         void *pad;
 338
 339         if (dma_base == 0)
 340                 return -1;
 341
 342         printk(KERN_INFO "%s: BM-DMA at 0x%04lx-0x%04lx\n", hwif->name,
 343                dma_base, dma_base + num_ports - 1);
 344
 345         if (!request_mem_region(dma_base, num_ports, hwif->name)) {
 346                 printk(KERN_ERR
 347                        "%s(%s) -- ERROR, Addresses 0x%p to 0x%p "
 348                        "ALREADY in use\n",
 349                        __func__, hwif->name, (void *) dma_base,
 350                        (void *) dma_base + num_ports - 1);
 351                 return -1;
 352         }
 353
 354         virt_dma_base = ioremap(dma_base, num_ports);
 355         if (virt_dma_base == NULL) {
 356                 printk(KERN_ERR
 357                        "%s(%s) -- ERROR, Unable to map addresses 0x%lx to 0x%lx\n",
 358                        __func__, hwif->name, dma_base, dma_base + num_ports - 1);
 359                 goto dma_remap_failure;
 360         }
 361         hwif->dma_base = (unsigned long) virt_dma_base;
 362
 363         hwif->dmatable_cpu = pci_alloc_consistent(dev,
 364                                           IOC4_PRD_ENTRIES * IOC4_PRD_BYTES,
 365                                           &hwif->dmatable_dma);
 366
 367         if (!hwif->dmatable_cpu)
 368                 goto dma_pci_alloc_failure;
 369
 370         hwif->sg_max_nents = IOC4_PRD_ENTRIES;
 371
 372         pad = pci_alloc_consistent(dev, IOC4_IDE_CACHELINE_SIZE,
 373                                    (dma_addr_t *)&hwif->extra_base);
 374         if (pad) {
 375                 ide_set_hwifdata(hwif, pad);
 376                 return 0;
 377         }
 378
 379         pci_free_consistent(dev, IOC4_PRD_ENTRIES * IOC4_PRD_BYTES,
 380                             hwif->dmatable_cpu, hwif->dmatable_dma);
 381         printk(KERN_INFO
 382                "%s() -- Error! Unable to allocate DMA Maps for drive %s\n",
 383                __func__, hwif->name);
 384         printk(KERN_INFO
 385                "Changing from DMA to PIO mode for Drive %s\n", hwif->name);
 386
 387 dma_pci_alloc_failure:
 388         iounmap(virt_dma_base);
 389
 390 dma_remap_failure:
 391         release_mem_region(dma_base, num_ports);
 392
 393         return -1;
 394 }
 395
 396 /* Initializes the IOC4 DMA Engine */
 397 static void
 398 sgiioc4_configure_for_dma(int dma_direction, ide_drive_t * drive)
 399 {
 400         u32 ioc4_dma;
 401         ide_hwif_t *hwif = HWIF(drive);
 402         unsigned long dma_base = hwif->dma_base;
 403         unsigned long ioc4_dma_addr = dma_base + IOC4_DMA_CTRL * 4;
 404         u32 dma_addr, ending_dma_addr;
 405
 406         ioc4_dma = readl((void __iomem *)ioc4_dma_addr);
 407
 408         if (ioc4_dma & IOC4_S_DMA_ACTIVE) {
 409                 printk(KERN_WARNING
 410                         "%s(%s):Warning!! DMA from previous transfer was still active\n",
 411                        __func__, drive->name);
 412                 writel(IOC4_S_DMA_STOP, (void __iomem *)ioc4_dma_addr);
 413                 ioc4_dma = sgiioc4_ide_dma_stop(hwif, dma_base);
 414
 415                 if (ioc4_dma & IOC4_S_DMA_STOP)
 416                         printk(KERN_ERR
 417                                "%s(%s) : IOC4 Dma STOP bit is still 1\n",
 418                                __func__, drive->name);
 419         }
 420
 421         ioc4_dma = readl((void __iomem *)ioc4_dma_addr);
 422         if (ioc4_dma & IOC4_S_DMA_ERROR) {
 423                 printk(KERN_WARNING
 424                        "%s(%s) : Warning!! - DMA Error during Previous"
 425                        " transfer | status 0x%x\n",
 426                        __func__, drive->name, ioc4_dma);
 427                 writel(IOC4_S_DMA_STOP, (void __iomem *)ioc4_dma_addr);
 428                 ioc4_dma = sgiioc4_ide_dma_stop(hwif, dma_base);
 429
 430                 if (ioc4_dma & IOC4_S_DMA_STOP)
 431                         printk(KERN_ERR
 432                                "%s(%s) : IOC4 DMA STOP bit is still 1\n",
 433                                __func__, drive->name);
 434         }
 435
 436         /* Address of the Scatter Gather List */
 437         dma_addr = cpu_to_le32(hwif->dmatable_dma);
 438         writel(dma_addr, (void __iomem *)(dma_base + IOC4_DMA_PTR_L * 4));
 439
 440         /* Address of the Ending DMA */
 441         memset(ide_get_hwifdata(hwif), 0, IOC4_IDE_CACHELINE_SIZE);
 442         ending_dma_addr = cpu_to_le32(hwif->extra_base);
 443         writel(ending_dma_addr, (void __iomem *)(dma_base + IOC4_DMA_END_ADDR * 4));
 444
 445         writel(dma_direction, (void __iomem *)ioc4_dma_addr);
 446         drive->waiting_for_dma = 1;
 447 }
 448
 449 /* IOC4 Scatter Gather list Format                                       */
 450 /* 128 Bit entries to support 64 bit addresses in the future             */
 451 /* The Scatter Gather list Entry should be in the BIG-ENDIAN Format      */
 452 /* --------------------------------------------------------------------- */
 453 /* | Upper 32 bits - Zero           |           Lower 32 bits- address | */
 454 /* --------------------------------------------------------------------- */
 455 /* | Upper 32 bits - Zero           |EOL| 15 unused     | 16 Bit Length| */
 456 /* --------------------------------------------------------------------- */
 457 /* Creates the scatter gather list, DMA Table */
 458 static unsigned int
 459 sgiioc4_build_dma_table(ide_drive_t * drive, struct request *rq, int ddir)
 460 {
 461         ide_hwif_t *hwif = HWIF(drive);
 462         unsigned int *table = hwif->dmatable_cpu;
 463         unsigned int count = 0, i = 1;
 464         struct scatterlist *sg;
 465
 466         hwif->sg_nents = i = ide_build_sglist(drive, rq);
 467
 468         if (!i)
 469                 return 0;       /* sglist of length Zero */
 470
 471         sg = hwif->sg_table;
 472         while (i && sg_dma_len(sg)) {
 473                 dma_addr_t cur_addr;
 474                 int cur_len;
 475                 cur_addr = sg_dma_address(sg);
 476                 cur_len = sg_dma_len(sg);
 477
 478                 while (cur_len) {
 479                         if (count++ >= IOC4_PRD_ENTRIES) {
 480                                 printk(KERN_WARNING
 481                                        "%s: DMA table too small\n",
 482                                        drive->name);
 483                                 goto use_pio_instead;
 484                         } else {
 485                                 u32 bcount =
 486                                     0x10000 - (cur_addr & 0xffff);
 487
 488                                 if (bcount > cur_len)
 489                                         bcount = cur_len;
 490
 491                                 /* put the addr, length in
 492                                  * the IOC4 dma-table format */
 493                                 *table = 0x0;
 494                                 table++;
 495                                 *table = cpu_to_be32(cur_addr);
 496                                 table++;
 497                                 *table = 0x0;
 498                                 table++;
 499
 500                                 *table = cpu_to_be32(bcount);
 501                                 table++;
 502
 503                                 cur_addr += bcount;
 504                                 cur_len -= bcount;
 505                         }
 506                 }
 507
 508                 sg = sg_next(sg);
 509                 i--;
 510         }
 511
 512         if (count) {
 513                 table--;
 514                 *table |= cpu_to_be32(0x80000000);
 515                 return count;
 516         }
 517
 518 use_pio_instead:
 519         ide_destroy_dmatable(drive);
 520
 521         return 0;               /* revert to PIO for this request */
 522 }
 523
 524 static int sgiioc4_dma_setup(ide_drive_t *drive)
 525 {
 526         struct request *rq = HWGROUP(drive)->rq;
 527         unsigned int count = 0;
 528         int ddir;
 529
 530         if (rq_data_dir(rq))
 531                 ddir = PCI_DMA_TODEVICE;
 532         else
 533                 ddir = PCI_DMA_FROMDEVICE;
 534
 535         if (!(count = sgiioc4_build_dma_table(drive, rq, ddir))) {
 536                 /* try PIO instead of DMA */
 537                 ide_map_sg(drive, rq);
 538                 return 1;
 539         }
 540
 541         if (rq_data_dir(rq))
 542                 /* Writes TO the IOC4 FROM Main Memory */
 543                 ddir = IOC4_DMA_READ;
 544         else
 545                 /* Writes FROM the IOC4 TO Main Memory */
 546                 ddir = IOC4_DMA_WRITE;
 547
 548         sgiioc4_configure_for_dma(ddir, drive);
 549
 550         return 0;
 551 }
 552
 553 static const struct ide_tp_ops sgiioc4_tp_ops = {
 554         .exec_command           = ide_exec_command,
 555         .read_status            = sgiioc4_read_status,
 556         .read_altstatus         = ide_read_altstatus,
 557         .read_sff_dma_status    = ide_read_sff_dma_status,
 558
 559         .set_irq                = ide_set_irq,
 560
 561         .tf_load                = ide_tf_load,
 562         .tf_read                = ide_tf_read,
 563
 564         .input_data             = ide_input_data,
 565         .output_data            = ide_output_data,
 566 };
 567
 568 static const struct ide_port_ops sgiioc4_port_ops = {
 569         .set_dma_mode           = sgiioc4_set_dma_mode,
 570         /* reset DMA engine, clear IRQs */
 571         .resetproc              = sgiioc4_resetproc,
 572         /* mask on/off NIEN register */
 573         .maskproc               = sgiioc4_maskproc,
 574 };
 575
 576 static const struct ide_dma_ops sgiioc4_dma_ops = {
 577         .dma_host_set           = sgiioc4_dma_host_set,
 578         .dma_setup              = sgiioc4_dma_setup,
 579         .dma_start              = sgiioc4_dma_start,
 580         .dma_end                = sgiioc4_dma_end,
 581         .dma_test_irq           = sgiioc4_dma_test_irq,
 582         .dma_lost_irq           = sgiioc4_dma_lost_irq,
 583         .dma_timeout            = ide_dma_timeout,
 584 };
 585
 586 static const struct ide_port_info sgiioc4_port_info __devinitdata = {
 587         .name                   = DRV_NAME,
 588         .chipset                = ide_pci,
 589         .init_dma               = ide_dma_sgiioc4,
 590         .tp_ops                 = &sgiioc4_tp_ops,
 591         .port_ops               = &sgiioc4_port_ops,
 592         .dma_ops                = &sgiioc4_dma_ops,
 593         .host_flags             = IDE_HFLAG_MMIO,
 594         .mwdma_mask             = ATA_MWDMA2_ONLY,
 595 };
 596
 597 static int __devinit
 598 sgiioc4_ide_setup_pci_device(struct pci_dev *dev)
 599 {
 600         unsigned long cmd_base, irqport;
 601         unsigned long bar0, cmd_phys_base, ctl;
 602         void __iomem *virt_base;
 603         struct ide_host *host;
 604         hw_regs_t hw, *hws[] = { &hw, NULL, NULL, NULL };
 605         struct ide_port_info d = sgiioc4_port_info;
 606         int rc;
 607
 608         /*  Get the CmdBlk and CtrlBlk Base Registers */
 609         bar0 = pci_resource_start(dev, 0);
 610         virt_base = ioremap(bar0, pci_resource_len(dev, 0));
 611         if (virt_base == NULL) {
 612                 printk(KERN_ERR "%s: Unable to remap BAR 0 address: 0x%lx\n",
 613                                 DRV_NAME, bar0);
 614                 return -ENOMEM;
 615         }
 616         cmd_base = (unsigned long) virt_base + IOC4_CMD_OFFSET;
 617         ctl = (unsigned long) virt_base + IOC4_CTRL_OFFSET;
 618         irqport = (unsigned long) virt_base + IOC4_INTR_OFFSET;
 619
 620         cmd_phys_base = bar0 + IOC4_CMD_OFFSET;
 621         if (!request_mem_region(cmd_phys_base, IOC4_CMD_CTL_BLK_SIZE,
 622             DRV_NAME)) {
 623                 printk(KERN_ERR
 624                         "%s : %s -- ERROR, Addresses "
 625                         "0x%p to 0x%p ALREADY in use\n",
 626                        __func__, DRV_NAME, (void *) cmd_phys_base,
 627                        (void *) cmd_phys_base + IOC4_CMD_CTL_BLK_SIZE);
 628                 return -ENOMEM;
 629         }
 630
 631         /* Initialize the IO registers */
 632         memset(&hw, 0, sizeof(hw));
 633         sgiioc4_init_hwif_ports(&hw, cmd_base, ctl, irqport);
 634         hw.irq = dev->irq;
 635         hw.chipset = ide_pci;
 636         hw.dev = &dev->dev;
 637
 638         /* Initializing chipset IRQ Registers */
 639         writel(0x03, (void __iomem *)(irqport + IOC4_INTR_SET * 4));
 640
 641         host = ide_host_alloc(&d, hws);
 642         if (host == NULL) {
 643                 rc = -ENOMEM;
 644                 goto err;
 645         }
 646
 647         rc = ide_host_register(host, &d, hws);
 648         if (rc)
 649                 goto err_free;
 650
 651         return 0;
 652 err_free:
 653         ide_host_free(host);
 654 err:
 655         release_mem_region(cmd_phys_base, IOC4_CMD_CTL_BLK_SIZE);
 656         iounmap(virt_base);
 657         return rc;
 658 }
 659
 660 static unsigned int __devinit
 661 pci_init_sgiioc4(struct pci_dev *dev)
 662 {
 663         int ret;
 664
 665         printk(KERN_INFO "%s: IDE controller at PCI slot %s, revision %d\n",
 666                          DRV_NAME, pci_name(dev), dev->revision);
 667
 668         if (dev->revision < IOC4_SUPPORTED_FIRMWARE_REV) {
 669                 printk(KERN_ERR "Skipping %s IDE controller in slot %s: "
 670                                 "firmware is obsolete - please upgrade to "
 671                                 "revision46 or higher\n",
 672                                 DRV_NAME, pci_name(dev));
 673                 ret = -EAGAIN;
 674                 goto out;
 675         }
 676         ret = sgiioc4_ide_setup_pci_device(dev);
 677 out:
 678         return ret;
 679 }
 680
 681 int
 682 ioc4_ide_attach_one(struct ioc4_driver_data *idd)
 683 {
 684         /* PCI-RT does not bring out IDE connection.
 685          * Do not attach to this particular IOC4.
 686          */
 687         if (idd->idd_variant == IOC4_VARIANT_PCI_RT)
 688                 return 0;
 689
 690         return pci_init_sgiioc4(idd->idd_pdev);
 691 }
 692
 693 static struct ioc4_submodule ioc4_ide_submodule = {
 694         .is_name = "IOC4_ide",
 695         .is_owner = THIS_MODULE,
 696         .is_probe = ioc4_ide_attach_one,
 697 /*      .is_remove = ioc4_ide_remove_one,       */
 698 };
 699
 700 static int __init ioc4_ide_init(void)
 701 {
 702         return ioc4_register_submodule(&ioc4_ide_submodule);
 703 }
 704
 705 late_initcall(ioc4_ide_init); /* Call only after IDE init is done */
 706
 707 MODULE_AUTHOR("Aniket Malatpure/Jeremy Higdon");
 708 MODULE_DESCRIPTION("IDE PCI driver module for SGI IOC4 Base-IO Card");
 709 MODULE_LICENSE("GPL");