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/timer.h>
  29 #include <linux/mm.h>
  30 #include <linux/ioport.h>
  31 #include <linux/blkdev.h>
  32 #include <linux/scatterlist.h>
  33 #include <linux/ioc4.h>
  34 #include <asm/io.h>
  35
  36 #include <linux/ide.h>
  37
  38 #define DRV_NAME "SGIIOC4"
  39
  40 /* IOC4 Specific Definitions */
  41 #define IOC4_CMD_OFFSET         0x100
  42 #define IOC4_CTRL_OFFSET        0x120
  43 #define IOC4_DMA_OFFSET         0x140
  44 #define IOC4_INTR_OFFSET        0x0
  45
  46 #define IOC4_TIMING             0x00
  47 #define IOC4_DMA_PTR_L          0x01
  48 #define IOC4_DMA_PTR_H          0x02
  49 #define IOC4_DMA_ADDR_L         0x03
  50 #define IOC4_DMA_ADDR_H         0x04
  51 #define IOC4_BC_DEV             0x05
  52 #define IOC4_BC_MEM             0x06
  53 #define IOC4_DMA_CTRL           0x07
  54 #define IOC4_DMA_END_ADDR       0x08
  55
  56 /* Bits in the IOC4 Control/Status Register */
  57 #define IOC4_S_DMA_START        0x01
  58 #define IOC4_S_DMA_STOP         0x02
  59 #define IOC4_S_DMA_DIR          0x04
  60 #define IOC4_S_DMA_ACTIVE       0x08
  61 #define IOC4_S_DMA_ERROR        0x10
  62 #define IOC4_ATA_MEMERR         0x02
  63
  64 /* Read/Write Directions */
  65 #define IOC4_DMA_WRITE          0x04
  66 #define IOC4_DMA_READ           0x00
  67
  68 /* Interrupt Register Offsets */
  69 #define IOC4_INTR_REG           0x03
  70 #define IOC4_INTR_SET           0x05
  71 #define IOC4_INTR_CLEAR         0x07
  72
  73 #define IOC4_IDE_CACHELINE_SIZE 128
  74 #define IOC4_CMD_CTL_BLK_SIZE   0x20
  75 #define IOC4_SUPPORTED_FIRMWARE_REV 46
  76
  77 typedef struct {
  78         u32 timing_reg0;
  79         u32 timing_reg1;
  80         u32 low_mem_ptr;
  81         u32 high_mem_ptr;
  82         u32 low_mem_addr;
  83         u32 high_mem_addr;
  84         u32 dev_byte_count;
  85         u32 mem_byte_count;
  86         u32 status;
  87 } ioc4_dma_regs_t;
  88
  89 /* Each Physical Region Descriptor Entry size is 16 bytes (2 * 64 bits) */
  90 /* IOC4 has only 1 IDE channel */
  91 #define IOC4_PRD_BYTES       16
  92 #define IOC4_PRD_ENTRIES     (PAGE_SIZE /(4*IOC4_PRD_BYTES))
  93
  94
  95 static void
  96 sgiioc4_init_hwif_ports(hw_regs_t * hw, unsigned long data_port,
  97                         unsigned long ctrl_port, unsigned long irq_port)
  98 {
  99         unsigned long reg = data_port;
 100         int i;
 101
 102         /* Registers are word (32 bit) aligned */
 103         for (i = IDE_DATA_OFFSET; i <= IDE_STATUS_OFFSET; i++)
 104                 hw->io_ports[i] = reg + i * 4;
 105
 106         if (ctrl_port)
 107                 hw->io_ports[IDE_CONTROL_OFFSET] = ctrl_port;
 108
 109         if (irq_port)
 110                 hw->io_ports[IDE_IRQ_OFFSET] = irq_port;
 111 }
 112
 113 static void
 114 sgiioc4_maskproc(ide_drive_t * drive, int mask)
 115 {
 116         writeb(mask ? (drive->ctl | 2) : (drive->ctl & ~2),
 117                (void __iomem *)IDE_CONTROL_REG);
 118 }
 119
 120
 121 static int
 122 sgiioc4_checkirq(ide_hwif_t * hwif)
 123 {
 124         unsigned long intr_addr =
 125                 hwif->io_ports[IDE_IRQ_OFFSET] + IOC4_INTR_REG * 4;
 126
 127         if ((u8)readl((void __iomem *)intr_addr) & 0x03)
 128                 return 1;
 129
 130         return 0;
 131 }
 132
 133 static u8 sgiioc4_INB(unsigned long);
 134
 135 static int
 136 sgiioc4_clearirq(ide_drive_t * drive)
 137 {
 138         u32 intr_reg;
 139         ide_hwif_t *hwif = HWIF(drive);
 140         unsigned long other_ir =
 141             hwif->io_ports[IDE_IRQ_OFFSET] + (IOC4_INTR_REG << 2);
 142
 143         /* Code to check for PCI error conditions */
 144         intr_reg = readl((void __iomem *)other_ir);
 145         if (intr_reg & 0x03) { /* Valid IOC4-IDE interrupt */
 146                 /*
 147                  * Using sgiioc4_INB to read the IDE_STATUS_REG has a side effect
 148                  * of clearing the interrupt.  The first read should clear it
 149                  * if it is set.  The second read should return a "clear" status
 150                  * if it got cleared.  If not, then spin for a bit trying to
 151                  * clear it.
 152                  */
 153                 u8 stat = sgiioc4_INB(IDE_STATUS_REG);
 154                 int count = 0;
 155                 stat = sgiioc4_INB(IDE_STATUS_REG);
 156                 while ((stat & 0x80) && (count++ < 100)) {
 157                         udelay(1);
 158                         stat = sgiioc4_INB(IDE_STATUS_REG);
 159                 }
 160
 161                 if (intr_reg & 0x02) {
 162                         /* Error when transferring DMA data on PCI bus */
 163                         u32 pci_err_addr_low, pci_err_addr_high,
 164                             pci_stat_cmd_reg;
 165
 166                         pci_err_addr_low =
 167                                 readl((void __iomem *)hwif->io_ports[IDE_IRQ_OFFSET]);
 168                         pci_err_addr_high =
 169                                 readl((void __iomem *)(hwif->io_ports[IDE_IRQ_OFFSET] + 4));
 170                         pci_read_config_dword(hwif->pci_dev, PCI_COMMAND,
 171                                               &pci_stat_cmd_reg);
 172                         printk(KERN_ERR
 173                                "%s(%s) : PCI Bus Error when doing DMA:"
 174                                    " status-cmd reg is 0x%x\n",
 175                                __FUNCTION__, drive->name, pci_stat_cmd_reg);
 176                         printk(KERN_ERR
 177                                "%s(%s) : PCI Error Address is 0x%x%x\n",
 178                                __FUNCTION__, drive->name,
 179                                pci_err_addr_high, pci_err_addr_low);
 180                         /* Clear the PCI Error indicator */
 181                         pci_write_config_dword(hwif->pci_dev, PCI_COMMAND,
 182                                                0x00000146);
 183                 }
 184
 185                 /* Clear the Interrupt, Error bits on the IOC4 */
 186                 writel(0x03, (void __iomem *)other_ir);
 187
 188                 intr_reg = readl((void __iomem *)other_ir);
 189         }
 190
 191         return intr_reg & 3;
 192 }
 193
 194 static void sgiioc4_ide_dma_start(ide_drive_t * drive)
 195 {
 196         ide_hwif_t *hwif = HWIF(drive);
 197         unsigned long ioc4_dma_addr = hwif->dma_base + IOC4_DMA_CTRL * 4;
 198         unsigned int reg = readl((void __iomem *)ioc4_dma_addr);
 199         unsigned int temp_reg = reg | IOC4_S_DMA_START;
 200
 201         writel(temp_reg, (void __iomem *)ioc4_dma_addr);
 202 }
 203
 204 static u32
 205 sgiioc4_ide_dma_stop(ide_hwif_t *hwif, u64 dma_base)
 206 {
 207         unsigned long ioc4_dma_addr = dma_base + IOC4_DMA_CTRL * 4;
 208         u32     ioc4_dma;
 209         int     count;
 210
 211         count = 0;
 212         ioc4_dma = readl((void __iomem *)ioc4_dma_addr);
 213         while ((ioc4_dma & IOC4_S_DMA_STOP) && (count++ < 200)) {
 214                 udelay(1);
 215                 ioc4_dma = readl((void __iomem *)ioc4_dma_addr);
 216         }
 217         return ioc4_dma;
 218 }
 219
 220 /* Stops the IOC4 DMA Engine */
 221 static int
 222 sgiioc4_ide_dma_end(ide_drive_t * drive)
 223 {
 224         u32 ioc4_dma, bc_dev, bc_mem, num, valid = 0, cnt = 0;
 225         ide_hwif_t *hwif = HWIF(drive);
 226         unsigned long dma_base = hwif->dma_base;
 227         int dma_stat = 0;
 228         unsigned long *ending_dma = ide_get_hwifdata(hwif);
 229
 230         writel(IOC4_S_DMA_STOP, (void __iomem *)(dma_base + IOC4_DMA_CTRL * 4));
 231
 232         ioc4_dma = sgiioc4_ide_dma_stop(hwif, dma_base);
 233
 234         if (ioc4_dma & IOC4_S_DMA_STOP) {
 235                 printk(KERN_ERR
 236                        "%s(%s): IOC4 DMA STOP bit is still 1 :"
 237                        "ioc4_dma_reg 0x%x\n",
 238                        __FUNCTION__, drive->name, ioc4_dma);
 239                 dma_stat = 1;
 240         }
 241
 242         /*
 243          * The IOC4 will DMA 1's to the ending dma area to indicate that
 244          * previous data DMA is complete.  This is necessary because of relaxed
 245          * ordering between register reads and DMA writes on the Altix.
 246          */
 247         while ((cnt++ < 200) && (!valid)) {
 248                 for (num = 0; num < 16; num++) {
 249                         if (ending_dma[num]) {
 250                                 valid = 1;
 251                                 break;
 252                         }
 253                 }
 254                 udelay(1);
 255         }
 256         if (!valid) {
 257                 printk(KERN_ERR "%s(%s) : DMA incomplete\n", __FUNCTION__,
 258                        drive->name);
 259                 dma_stat = 1;
 260         }
 261
 262         bc_dev = readl((void __iomem *)(dma_base + IOC4_BC_DEV * 4));
 263         bc_mem = readl((void __iomem *)(dma_base + IOC4_BC_MEM * 4));
 264
 265         if ((bc_dev & 0x01FF) || (bc_mem & 0x1FF)) {
 266                 if (bc_dev > bc_mem + 8) {
 267                         printk(KERN_ERR
 268                                "%s(%s): WARNING!! byte_count_dev %d "
 269                                "!= byte_count_mem %d\n",
 270                                __FUNCTION__, drive->name, bc_dev, bc_mem);
 271                 }
 272         }
 273
 274         drive->waiting_for_dma = 0;
 275         ide_destroy_dmatable(drive);
 276
 277         return dma_stat;
 278 }
 279
 280 static int
 281 sgiioc4_ide_dma_on(ide_drive_t * drive)
 282 {
 283         drive->using_dma = 1;
 284         ide_toggle_bounce(drive, 1);
 285
 286         return 0;
 287 }
 288
 289 static void sgiioc4_dma_off_quietly(ide_drive_t *drive)
 290 {
 291         drive->using_dma = 0;
 292         ide_toggle_bounce(drive, 0);
 293
 294         drive->hwif->dma_host_off(drive);
 295 }
 296
 297 static void sgiioc4_set_dma_mode(ide_drive_t *drive, const u8 speed)
 298 {
 299 }
 300
 301 /* returns 1 if dma irq issued, 0 otherwise */
 302 static int
 303 sgiioc4_ide_dma_test_irq(ide_drive_t * drive)
 304 {
 305         return sgiioc4_checkirq(HWIF(drive));
 306 }
 307
 308 static void sgiioc4_dma_host_on(ide_drive_t * drive)
 309 {
 310 }
 311
 312 static void sgiioc4_dma_host_off(ide_drive_t * drive)
 313 {
 314         sgiioc4_clearirq(drive);
 315 }
 316
 317 static void
 318 sgiioc4_resetproc(ide_drive_t * drive)
 319 {
 320         sgiioc4_ide_dma_end(drive);
 321         sgiioc4_clearirq(drive);
 322 }
 323
 324 static void
 325 sgiioc4_dma_lost_irq(ide_drive_t * drive)
 326 {
 327         sgiioc4_resetproc(drive);
 328
 329         ide_dma_lost_irq(drive);
 330 }
 331
 332 static u8
 333 sgiioc4_INB(unsigned long port)
 334 {
 335         u8 reg = (u8) readb((void __iomem *) port);
 336
 337         if ((port & 0xFFF) == 0x11C) {  /* Status register of IOC4 */
 338                 if (reg & 0x51) {       /* Not busy...check for interrupt */
 339                         unsigned long other_ir = port - 0x110;
 340                         unsigned int intr_reg = (u32) readl((void __iomem *) other_ir);
 341
 342                         /* Clear the Interrupt, Error bits on the IOC4 */
 343                         if (intr_reg & 0x03) {
 344                                 writel(0x03, (void __iomem *) other_ir);
 345                                 intr_reg = (u32) readl((void __iomem *) other_ir);
 346                         }
 347                 }
 348         }
 349
 350         return reg;
 351 }
 352
 353 /* Creates a dma map for the scatter-gather list entries */
 354 static int __devinit
 355 ide_dma_sgiioc4(ide_hwif_t * hwif, unsigned long dma_base)
 356 {
 357         void __iomem *virt_dma_base;
 358         int num_ports = sizeof (ioc4_dma_regs_t);
 359         void *pad;
 360
 361         printk(KERN_INFO "%s: BM-DMA at 0x%04lx-0x%04lx\n", hwif->name,
 362                dma_base, dma_base + num_ports - 1);
 363
 364         if (!request_mem_region(dma_base, num_ports, hwif->name)) {
 365                 printk(KERN_ERR
 366                        "%s(%s) -- ERROR, Addresses 0x%p to 0x%p "
 367                        "ALREADY in use\n",
 368                        __FUNCTION__, hwif->name, (void *) dma_base,
 369                        (void *) dma_base + num_ports - 1);
 370                 return -1;
 371         }
 372
 373         virt_dma_base = ioremap(dma_base, num_ports);
 374         if (virt_dma_base == NULL) {
 375                 printk(KERN_ERR
 376                        "%s(%s) -- ERROR, Unable to map addresses 0x%lx to 0x%lx\n",
 377                        __FUNCTION__, hwif->name, dma_base, dma_base + num_ports - 1);
 378                 goto dma_remap_failure;
 379         }
 380         hwif->dma_base = (unsigned long) virt_dma_base;
 381
 382         hwif->dmatable_cpu = pci_alloc_consistent(hwif->pci_dev,
 383                                           IOC4_PRD_ENTRIES * IOC4_PRD_BYTES,
 384                                           &hwif->dmatable_dma);
 385
 386         if (!hwif->dmatable_cpu)
 387                 goto dma_pci_alloc_failure;
 388
 389         hwif->sg_max_nents = IOC4_PRD_ENTRIES;
 390
 391         pad = pci_alloc_consistent(hwif->pci_dev, IOC4_IDE_CACHELINE_SIZE,
 392                                    (dma_addr_t *) &(hwif->dma_status));
 393
 394         if (pad) {
 395                 ide_set_hwifdata(hwif, pad);
 396                 return 0;
 397         }
 398
 399         pci_free_consistent(hwif->pci_dev,
 400                             IOC4_PRD_ENTRIES * IOC4_PRD_BYTES,
 401                             hwif->dmatable_cpu, hwif->dmatable_dma);
 402         printk(KERN_INFO
 403                "%s() -- Error! Unable to allocate DMA Maps for drive %s\n",
 404                __FUNCTION__, hwif->name);
 405         printk(KERN_INFO
 406                "Changing from DMA to PIO mode for Drive %s\n", hwif->name);
 407
 408 dma_pci_alloc_failure:
 409         iounmap(virt_dma_base);
 410
 411 dma_remap_failure:
 412         release_mem_region(dma_base, num_ports);
 413
 414         return -1;
 415 }
 416
 417 /* Initializes the IOC4 DMA Engine */
 418 static void
 419 sgiioc4_configure_for_dma(int dma_direction, ide_drive_t * drive)
 420 {
 421         u32 ioc4_dma;
 422         ide_hwif_t *hwif = HWIF(drive);
 423         unsigned long dma_base = hwif->dma_base;
 424         unsigned long ioc4_dma_addr = dma_base + IOC4_DMA_CTRL * 4;
 425         u32 dma_addr, ending_dma_addr;
 426
 427         ioc4_dma = readl((void __iomem *)ioc4_dma_addr);
 428
 429         if (ioc4_dma & IOC4_S_DMA_ACTIVE) {
 430                 printk(KERN_WARNING
 431                         "%s(%s):Warning!! DMA from previous transfer was still active\n",
 432                        __FUNCTION__, drive->name);
 433                 writel(IOC4_S_DMA_STOP, (void __iomem *)ioc4_dma_addr);
 434                 ioc4_dma = sgiioc4_ide_dma_stop(hwif, dma_base);
 435
 436                 if (ioc4_dma & IOC4_S_DMA_STOP)
 437                         printk(KERN_ERR
 438                                "%s(%s) : IOC4 Dma STOP bit is still 1\n",
 439                                __FUNCTION__, drive->name);
 440         }
 441
 442         ioc4_dma = readl((void __iomem *)ioc4_dma_addr);
 443         if (ioc4_dma & IOC4_S_DMA_ERROR) {
 444                 printk(KERN_WARNING
 445                        "%s(%s) : Warning!! - DMA Error during Previous"
 446                        " transfer | status 0x%x\n",
 447                        __FUNCTION__, drive->name, ioc4_dma);
 448                 writel(IOC4_S_DMA_STOP, (void __iomem *)ioc4_dma_addr);
 449                 ioc4_dma = sgiioc4_ide_dma_stop(hwif, dma_base);
 450
 451                 if (ioc4_dma & IOC4_S_DMA_STOP)
 452                         printk(KERN_ERR
 453                                "%s(%s) : IOC4 DMA STOP bit is still 1\n",
 454                                __FUNCTION__, drive->name);
 455         }
 456
 457         /* Address of the Scatter Gather List */
 458         dma_addr = cpu_to_le32(hwif->dmatable_dma);
 459         writel(dma_addr, (void __iomem *)(dma_base + IOC4_DMA_PTR_L * 4));
 460
 461         /* Address of the Ending DMA */
 462         memset(ide_get_hwifdata(hwif), 0, IOC4_IDE_CACHELINE_SIZE);
 463         ending_dma_addr = cpu_to_le32(hwif->dma_status);
 464         writel(ending_dma_addr, (void __iomem *)(dma_base + IOC4_DMA_END_ADDR * 4));
 465
 466         writel(dma_direction, (void __iomem *)ioc4_dma_addr);
 467         drive->waiting_for_dma = 1;
 468 }
 469
 470 /* IOC4 Scatter Gather list Format                                       */
 471 /* 128 Bit entries to support 64 bit addresses in the future             */
 472 /* The Scatter Gather list Entry should be in the BIG-ENDIAN Format      */
 473 /* --------------------------------------------------------------------- */
 474 /* | Upper 32 bits - Zero           |           Lower 32 bits- address | */
 475 /* --------------------------------------------------------------------- */
 476 /* | Upper 32 bits - Zero           |EOL| 15 unused     | 16 Bit Length| */
 477 /* --------------------------------------------------------------------- */
 478 /* Creates the scatter gather list, DMA Table */
 479 static unsigned int
 480 sgiioc4_build_dma_table(ide_drive_t * drive, struct request *rq, int ddir)
 481 {
 482         ide_hwif_t *hwif = HWIF(drive);
 483         unsigned int *table = hwif->dmatable_cpu;
 484         unsigned int count = 0, i = 1;
 485         struct scatterlist *sg;
 486
 487         hwif->sg_nents = i = ide_build_sglist(drive, rq);
 488
 489         if (!i)
 490                 return 0;       /* sglist of length Zero */
 491
 492         sg = hwif->sg_table;
 493         while (i && sg_dma_len(sg)) {
 494                 dma_addr_t cur_addr;
 495                 int cur_len;
 496                 cur_addr = sg_dma_address(sg);
 497                 cur_len = sg_dma_len(sg);
 498
 499                 while (cur_len) {
 500                         if (count++ >= IOC4_PRD_ENTRIES) {
 501                                 printk(KERN_WARNING
 502                                        "%s: DMA table too small\n",
 503                                        drive->name);
 504                                 goto use_pio_instead;
 505                         } else {
 506                                 u32 bcount =
 507                                     0x10000 - (cur_addr & 0xffff);
 508
 509                                 if (bcount > cur_len)
 510                                         bcount = cur_len;
 511
 512                                 /* put the addr, length in
 513                                  * the IOC4 dma-table format */
 514                                 *table = 0x0;
 515                                 table++;
 516                                 *table = cpu_to_be32(cur_addr);
 517                                 table++;
 518                                 *table = 0x0;
 519                                 table++;
 520
 521                                 *table = cpu_to_be32(bcount);
 522                                 table++;
 523
 524                                 cur_addr += bcount;
 525                                 cur_len -= bcount;
 526                         }
 527                 }
 528
 529                 sg = sg_next(sg);
 530                 i--;
 531         }
 532
 533         if (count) {
 534                 table--;
 535                 *table |= cpu_to_be32(0x80000000);
 536                 return count;
 537         }
 538
 539 use_pio_instead:
 540         pci_unmap_sg(hwif->pci_dev, hwif->sg_table, hwif->sg_nents,
 541                      hwif->sg_dma_direction);
 542
 543         return 0;               /* revert to PIO for this request */
 544 }
 545
 546 static int sgiioc4_ide_dma_setup(ide_drive_t *drive)
 547 {
 548         struct request *rq = HWGROUP(drive)->rq;
 549         unsigned int count = 0;
 550         int ddir;
 551
 552         if (rq_data_dir(rq))
 553                 ddir = PCI_DMA_TODEVICE;
 554         else
 555                 ddir = PCI_DMA_FROMDEVICE;
 556
 557         if (!(count = sgiioc4_build_dma_table(drive, rq, ddir))) {
 558                 /* try PIO instead of DMA */
 559                 ide_map_sg(drive, rq);
 560                 return 1;
 561         }
 562
 563         if (rq_data_dir(rq))
 564                 /* Writes TO the IOC4 FROM Main Memory */
 565                 ddir = IOC4_DMA_READ;
 566         else
 567                 /* Writes FROM the IOC4 TO Main Memory */
 568                 ddir = IOC4_DMA_WRITE;
 569
 570         sgiioc4_configure_for_dma(ddir, drive);
 571
 572         return 0;
 573 }
 574
 575 static void __devinit
 576 ide_init_sgiioc4(ide_hwif_t * hwif)
 577 {
 578         hwif->mmio = 1;
 579         hwif->pio_mask = 0x00;
 580         hwif->set_pio_mode = NULL; /* Sets timing for PIO mode */
 581         hwif->set_dma_mode = &sgiioc4_set_dma_mode;
 582         hwif->selectproc = NULL;/* Use the default routine to select drive */
 583         hwif->reset_poll = NULL;/* No HBA specific reset_poll needed */
 584         hwif->pre_reset = NULL; /* No HBA specific pre_set needed */
 585         hwif->resetproc = &sgiioc4_resetproc;/* Reset DMA engine,
 586                                                 clear interrupts */
 587         hwif->maskproc = &sgiioc4_maskproc;     /* Mask on/off NIEN register */
 588         hwif->quirkproc = NULL;
 589         hwif->busproc = NULL;
 590
 591         hwif->INB = &sgiioc4_INB;
 592
 593         if (hwif->dma_base == 0)
 594                 return;
 595
 596         hwif->mwdma_mask = ATA_MWDMA2_ONLY;
 597
 598         hwif->dma_setup = &sgiioc4_ide_dma_setup;
 599         hwif->dma_start = &sgiioc4_ide_dma_start;
 600         hwif->ide_dma_end = &sgiioc4_ide_dma_end;
 601         hwif->ide_dma_on = &sgiioc4_ide_dma_on;
 602         hwif->dma_off_quietly = &sgiioc4_dma_off_quietly;
 603         hwif->ide_dma_test_irq = &sgiioc4_ide_dma_test_irq;
 604         hwif->dma_host_on = &sgiioc4_dma_host_on;
 605         hwif->dma_host_off = &sgiioc4_dma_host_off;
 606         hwif->dma_lost_irq = &sgiioc4_dma_lost_irq;
 607         hwif->dma_timeout = &ide_dma_timeout;
 608 }
 609
 610 static int __devinit
 611 sgiioc4_ide_setup_pci_device(struct pci_dev *dev)
 612 {
 613         unsigned long cmd_base, dma_base, irqport;
 614         unsigned long bar0, cmd_phys_base, ctl;
 615         void __iomem *virt_base;
 616         ide_hwif_t *hwif;
 617         int h;
 618         u8 idx[4] = { 0xff, 0xff, 0xff, 0xff };
 619
 620         /*
 621          * Find an empty HWIF; if none available, return -ENOMEM.
 622          */
 623         for (h = 0; h < MAX_HWIFS; ++h) {
 624                 hwif = &ide_hwifs[h];
 625                 if (hwif->chipset == ide_unknown)
 626                         break;
 627         }
 628         if (h == MAX_HWIFS) {
 629                 printk(KERN_ERR "%s: too many IDE interfaces, no room in table\n",
 630                                 DRV_NAME);
 631                 return -ENOMEM;
 632         }
 633
 634         /*  Get the CmdBlk and CtrlBlk Base Registers */
 635         bar0 = pci_resource_start(dev, 0);
 636         virt_base = ioremap(bar0, pci_resource_len(dev, 0));
 637         if (virt_base == NULL) {
 638                 printk(KERN_ERR "%s: Unable to remap BAR 0 address: 0x%lx\n",
 639                                 DRV_NAME, bar0);
 640                 return -ENOMEM;
 641         }
 642         cmd_base = (unsigned long) virt_base + IOC4_CMD_OFFSET;
 643         ctl = (unsigned long) virt_base + IOC4_CTRL_OFFSET;
 644         irqport = (unsigned long) virt_base + IOC4_INTR_OFFSET;
 645         dma_base = pci_resource_start(dev, 0) + IOC4_DMA_OFFSET;
 646
 647         cmd_phys_base = bar0 + IOC4_CMD_OFFSET;
 648         if (!request_mem_region(cmd_phys_base, IOC4_CMD_CTL_BLK_SIZE,
 649             hwif->name)) {
 650                 printk(KERN_ERR
 651                         "%s : %s -- ERROR, Addresses "
 652                         "0x%p to 0x%p ALREADY in use\n",
 653                        __FUNCTION__, hwif->name, (void *) cmd_phys_base,
 654                        (void *) cmd_phys_base + IOC4_CMD_CTL_BLK_SIZE);
 655                 return -ENOMEM;
 656         }
 657
 658         if (hwif->io_ports[IDE_DATA_OFFSET] != cmd_base) {
 659                 hw_regs_t hw;
 660
 661                 /* Initialize the IO registers */
 662                 memset(&hw, 0, sizeof(hw));
 663                 sgiioc4_init_hwif_ports(&hw, cmd_base, ctl, irqport);
 664                 memcpy(hwif->io_ports, hw.io_ports, sizeof(hwif->io_ports));
 665                 hwif->noprobe = !hwif->io_ports[IDE_DATA_OFFSET];
 666         }
 667
 668         hwif->irq = dev->irq;
 669         hwif->chipset = ide_pci;
 670         hwif->pci_dev = dev;
 671         hwif->channel = 0;      /* Single Channel chip */
 672         hwif->gendev.parent = &dev->dev;/* setup proper ancestral information */
 673
 674         /* The IOC4 uses MMIO rather than Port IO. */
 675         default_hwif_mmiops(hwif);
 676
 677         /* Initializing chipset IRQ Registers */
 678         writel(0x03, (void __iomem *)(irqport + IOC4_INTR_SET * 4));
 679
 680         if (dma_base == 0 || ide_dma_sgiioc4(hwif, dma_base))
 681                 printk(KERN_INFO "%s: %s Bus-Master DMA disabled\n",
 682                                  hwif->name, DRV_NAME);
 683
 684         ide_init_sgiioc4(hwif);
 685
 686         idx[0] = hwif->index;
 687
 688         if (ide_device_add(idx))
 689                 return -EIO;
 690
 691         return 0;
 692 }
 693
 694 static unsigned int __devinit
 695 pci_init_sgiioc4(struct pci_dev *dev)
 696 {
 697         int ret;
 698
 699         printk(KERN_INFO "%s: IDE controller at PCI slot %s, revision %d\n",
 700                          DRV_NAME, pci_name(dev), dev->revision);
 701
 702         if (dev->revision < IOC4_SUPPORTED_FIRMWARE_REV) {
 703                 printk(KERN_ERR "Skipping %s IDE controller in slot %s: "
 704                                 "firmware is obsolete - please upgrade to "
 705                                 "revision46 or higher\n",
 706                                 DRV_NAME, pci_name(dev));
 707                 ret = -EAGAIN;
 708                 goto out;
 709         }
 710         ret = sgiioc4_ide_setup_pci_device(dev);
 711 out:
 712         return ret;
 713 }
 714
 715 int
 716 ioc4_ide_attach_one(struct ioc4_driver_data *idd)
 717 {
 718         /* PCI-RT does not bring out IDE connection.
 719          * Do not attach to this particular IOC4.
 720          */
 721         if (idd->idd_variant == IOC4_VARIANT_PCI_RT)
 722                 return 0;
 723
 724         return pci_init_sgiioc4(idd->idd_pdev);
 725 }
 726
 727 static struct ioc4_submodule ioc4_ide_submodule = {
 728         .is_name = "IOC4_ide",
 729         .is_owner = THIS_MODULE,
 730         .is_probe = ioc4_ide_attach_one,
 731 /*      .is_remove = ioc4_ide_remove_one,       */
 732 };
 733
 734 static int __init ioc4_ide_init(void)
 735 {
 736         return ioc4_register_submodule(&ioc4_ide_submodule);
 737 }
 738
 739 late_initcall(ioc4_ide_init); /* Call only after IDE init is done */
 740
 741 MODULE_AUTHOR("Aniket Malatpure/Jeremy Higdon");
 742 MODULE_DESCRIPTION("IDE PCI driver module for SGI IOC4 Base-IO Card");
 743 MODULE_LICENSE("GPL");