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/ioc4.h>
  33 #include <asm/io.h>
  34
  35 #include <linux/ide.h>
  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 typedef struct {
  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 } ioc4_dma_regs_t;
  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
  93 sgiioc4_init_hwif_ports(hw_regs_t * hw, unsigned long data_port,
  94                         unsigned long ctrl_port, unsigned long irq_port)
  95 {
  96         unsigned long reg = data_port;
  97         int i;
  98
  99         /* Registers are word (32 bit) aligned */
 100         for (i = IDE_DATA_OFFSET; i <= IDE_STATUS_OFFSET; i++)
 101                 hw->io_ports[i] = reg + i * 4;
 102
 103         if (ctrl_port)
 104                 hw->io_ports[IDE_CONTROL_OFFSET] = ctrl_port;
 105
 106         if (irq_port)
 107                 hw->io_ports[IDE_IRQ_OFFSET] = irq_port;
 108 }
 109
 110 static void
 111 sgiioc4_maskproc(ide_drive_t * drive, int mask)
 112 {
 113         ide_hwif_t *hwif = HWIF(drive);
 114         hwif->OUTB(mask ? (drive->ctl | 2) : (drive->ctl & ~2),
 115                    IDE_CONTROL_REG);
 116 }
 117
 118
 119 static int
 120 sgiioc4_checkirq(ide_hwif_t * hwif)
 121 {
 122         u8 intr_reg =
 123             hwif->INL(hwif->io_ports[IDE_IRQ_OFFSET] + IOC4_INTR_REG * 4);
 124
 125         if (intr_reg & 0x03)
 126                 return 1;
 127
 128         return 0;
 129 }
 130
 131
 132 static int
 133 sgiioc4_clearirq(ide_drive_t * drive)
 134 {
 135         u32 intr_reg;
 136         ide_hwif_t *hwif = HWIF(drive);
 137         unsigned long other_ir =
 138             hwif->io_ports[IDE_IRQ_OFFSET] + (IOC4_INTR_REG << 2);
 139
 140         /* Code to check for PCI error conditions */
 141         intr_reg = hwif->INL(other_ir);
 142         if (intr_reg & 0x03) { /* Valid IOC4-IDE interrupt */
 143                 /*
 144                  * Using hwif->INB to read the IDE_STATUS_REG has a side effect
 145                  * of clearing the interrupt.  The first read should clear it
 146                  * if it is set.  The second read should return a "clear" status
 147                  * if it got cleared.  If not, then spin for a bit trying to
 148                  * clear it.
 149                  */
 150                 u8 stat = hwif->INB(IDE_STATUS_REG);
 151                 int count = 0;
 152                 stat = hwif->INB(IDE_STATUS_REG);
 153                 while ((stat & 0x80) && (count++ < 100)) {
 154                         udelay(1);
 155                         stat = hwif->INB(IDE_STATUS_REG);
 156                 }
 157
 158                 if (intr_reg & 0x02) {
 159                         /* Error when transferring DMA data on PCI bus */
 160                         u32 pci_err_addr_low, pci_err_addr_high,
 161                             pci_stat_cmd_reg;
 162
 163                         pci_err_addr_low =
 164                                 hwif->INL(hwif->io_ports[IDE_IRQ_OFFSET]);
 165                         pci_err_addr_high =
 166                                 hwif->INL(hwif->io_ports[IDE_IRQ_OFFSET] + 4);
 167                         pci_read_config_dword(hwif->pci_dev, PCI_COMMAND,
 168                                               &pci_stat_cmd_reg);
 169                         printk(KERN_ERR
 170                                "%s(%s) : PCI Bus Error when doing DMA:"
 171                                    " status-cmd reg is 0x%x\n",
 172                                __FUNCTION__, drive->name, pci_stat_cmd_reg);
 173                         printk(KERN_ERR
 174                                "%s(%s) : PCI Error Address is 0x%x%x\n",
 175                                __FUNCTION__, drive->name,
 176                                pci_err_addr_high, pci_err_addr_low);
 177                         /* Clear the PCI Error indicator */
 178                         pci_write_config_dword(hwif->pci_dev, PCI_COMMAND,
 179                                                0x00000146);
 180                 }
 181
 182                 /* Clear the Interrupt, Error bits on the IOC4 */
 183                 hwif->OUTL(0x03, other_ir);
 184
 185                 intr_reg = hwif->INL(other_ir);
 186         }
 187
 188         return intr_reg & 3;
 189 }
 190
 191 static void sgiioc4_ide_dma_start(ide_drive_t * drive)
 192 {
 193         ide_hwif_t *hwif = HWIF(drive);
 194         unsigned int reg = hwif->INL(hwif->dma_base + IOC4_DMA_CTRL * 4);
 195         unsigned int temp_reg = reg | IOC4_S_DMA_START;
 196
 197         hwif->OUTL(temp_reg, hwif->dma_base + IOC4_DMA_CTRL * 4);
 198 }
 199
 200 static u32
 201 sgiioc4_ide_dma_stop(ide_hwif_t *hwif, u64 dma_base)
 202 {
 203         u32     ioc4_dma;
 204         int     count;
 205
 206         count = 0;
 207         ioc4_dma = hwif->INL(dma_base + IOC4_DMA_CTRL * 4);
 208         while ((ioc4_dma & IOC4_S_DMA_STOP) && (count++ < 200)) {
 209                 udelay(1);
 210                 ioc4_dma = hwif->INL(dma_base + IOC4_DMA_CTRL * 4);
 211         }
 212         return ioc4_dma;
 213 }
 214
 215 /* Stops the IOC4 DMA Engine */
 216 static int
 217 sgiioc4_ide_dma_end(ide_drive_t * drive)
 218 {
 219         u32 ioc4_dma, bc_dev, bc_mem, num, valid = 0, cnt = 0;
 220         ide_hwif_t *hwif = HWIF(drive);
 221         u64 dma_base = hwif->dma_base;
 222         int dma_stat = 0;
 223         unsigned long *ending_dma = ide_get_hwifdata(hwif);
 224
 225         hwif->OUTL(IOC4_S_DMA_STOP, dma_base + IOC4_DMA_CTRL * 4);
 226
 227         ioc4_dma = sgiioc4_ide_dma_stop(hwif, dma_base);
 228
 229         if (ioc4_dma & IOC4_S_DMA_STOP) {
 230                 printk(KERN_ERR
 231                        "%s(%s): IOC4 DMA STOP bit is still 1 :"
 232                        "ioc4_dma_reg 0x%x\n",
 233                        __FUNCTION__, drive->name, ioc4_dma);
 234                 dma_stat = 1;
 235         }
 236
 237         /*
 238          * The IOC4 will DMA 1's to the ending dma area to indicate that
 239          * previous data DMA is complete.  This is necessary because of relaxed
 240          * ordering between register reads and DMA writes on the Altix.
 241          */
 242         while ((cnt++ < 200) && (!valid)) {
 243                 for (num = 0; num < 16; num++) {
 244                         if (ending_dma[num]) {
 245                                 valid = 1;
 246                                 break;
 247                         }
 248                 }
 249                 udelay(1);
 250         }
 251         if (!valid) {
 252                 printk(KERN_ERR "%s(%s) : DMA incomplete\n", __FUNCTION__,
 253                        drive->name);
 254                 dma_stat = 1;
 255         }
 256
 257         bc_dev = hwif->INL(dma_base + IOC4_BC_DEV * 4);
 258         bc_mem = hwif->INL(dma_base + IOC4_BC_MEM * 4);
 259
 260         if ((bc_dev & 0x01FF) || (bc_mem & 0x1FF)) {
 261                 if (bc_dev > bc_mem + 8) {
 262                         printk(KERN_ERR
 263                                "%s(%s): WARNING!! byte_count_dev %d "
 264                                "!= byte_count_mem %d\n",
 265                                __FUNCTION__, drive->name, bc_dev, bc_mem);
 266                 }
 267         }
 268
 269         drive->waiting_for_dma = 0;
 270         ide_destroy_dmatable(drive);
 271
 272         return dma_stat;
 273 }
 274
 275 static int
 276 sgiioc4_ide_dma_check(ide_drive_t * drive)
 277 {
 278         if (ide_config_drive_speed(drive, XFER_MW_DMA_2) != 0) {
 279                 printk(KERN_INFO
 280                        "Couldnot set %s in Multimode-2 DMA mode | "
 281                            "Drive %s using PIO instead\n",
 282                        drive->name, drive->name);
 283                 drive->using_dma = 0;
 284         } else
 285                 drive->using_dma = 1;
 286
 287         return 0;
 288 }
 289
 290 static int
 291 sgiioc4_ide_dma_on(ide_drive_t * drive)
 292 {
 293         drive->using_dma = 1;
 294
 295         return HWIF(drive)->ide_dma_host_on(drive);
 296 }
 297
 298 static int
 299 sgiioc4_ide_dma_off_quietly(ide_drive_t * drive)
 300 {
 301         drive->using_dma = 0;
 302
 303         return HWIF(drive)->ide_dma_host_off(drive);
 304 }
 305
 306 /* returns 1 if dma irq issued, 0 otherwise */
 307 static int
 308 sgiioc4_ide_dma_test_irq(ide_drive_t * drive)
 309 {
 310         return sgiioc4_checkirq(HWIF(drive));
 311 }
 312
 313 static int
 314 sgiioc4_ide_dma_host_on(ide_drive_t * drive)
 315 {
 316         if (drive->using_dma)
 317                 return 0;
 318
 319         return 1;
 320 }
 321
 322 static int
 323 sgiioc4_ide_dma_host_off(ide_drive_t * drive)
 324 {
 325         sgiioc4_clearirq(drive);
 326
 327         return 0;
 328 }
 329
 330 static int
 331 sgiioc4_ide_dma_lostirq(ide_drive_t * drive)
 332 {
 333         HWIF(drive)->resetproc(drive);
 334
 335         return __ide_dma_lostirq(drive);
 336 }
 337
 338 static void
 339 sgiioc4_resetproc(ide_drive_t * drive)
 340 {
 341         sgiioc4_ide_dma_end(drive);
 342         sgiioc4_clearirq(drive);
 343 }
 344
 345 static u8
 346 sgiioc4_INB(unsigned long port)
 347 {
 348         u8 reg = (u8) readb((void __iomem *) port);
 349
 350         if ((port & 0xFFF) == 0x11C) {  /* Status register of IOC4 */
 351                 if (reg & 0x51) {       /* Not busy...check for interrupt */
 352                         unsigned long other_ir = port - 0x110;
 353                         unsigned int intr_reg = (u32) readl((void __iomem *) other_ir);
 354
 355                         /* Clear the Interrupt, Error bits on the IOC4 */
 356                         if (intr_reg & 0x03) {
 357                                 writel(0x03, (void __iomem *) other_ir);
 358                                 intr_reg = (u32) readl((void __iomem *) other_ir);
 359                         }
 360                 }
 361         }
 362
 363         return reg;
 364 }
 365
 366 /* Creates a dma map for the scatter-gather list entries */
 367 static void __devinit
 368 ide_dma_sgiioc4(ide_hwif_t * hwif, unsigned long dma_base)
 369 {
 370         void __iomem *virt_dma_base;
 371         int num_ports = sizeof (ioc4_dma_regs_t);
 372         void *pad;
 373
 374         printk(KERN_INFO "%s: BM-DMA at 0x%04lx-0x%04lx\n", hwif->name,
 375                dma_base, dma_base + num_ports - 1);
 376
 377         if (!request_mem_region(dma_base, num_ports, hwif->name)) {
 378                 printk(KERN_ERR
 379                        "%s(%s) -- ERROR, Addresses 0x%p to 0x%p "
 380                        "ALREADY in use\n",
 381                        __FUNCTION__, hwif->name, (void *) dma_base,
 382                        (void *) dma_base + num_ports - 1);
 383                 goto dma_alloc_failure;
 384         }
 385
 386         virt_dma_base = ioremap(dma_base, num_ports);
 387         if (virt_dma_base == NULL) {
 388                 printk(KERN_ERR
 389                        "%s(%s) -- ERROR, Unable to map addresses 0x%lx to 0x%lx\n",
 390                        __FUNCTION__, hwif->name, dma_base, dma_base + num_ports - 1);
 391                 goto dma_remap_failure;
 392         }
 393         hwif->dma_base = (unsigned long) virt_dma_base;
 394
 395         hwif->dmatable_cpu = pci_alloc_consistent(hwif->pci_dev,
 396                                           IOC4_PRD_ENTRIES * IOC4_PRD_BYTES,
 397                                           &hwif->dmatable_dma);
 398
 399         if (!hwif->dmatable_cpu)
 400                 goto dma_pci_alloc_failure;
 401
 402         hwif->sg_max_nents = IOC4_PRD_ENTRIES;
 403
 404         pad = pci_alloc_consistent(hwif->pci_dev, IOC4_IDE_CACHELINE_SIZE,
 405                                    (dma_addr_t *) &(hwif->dma_status));
 406
 407         if (pad) {
 408                 ide_set_hwifdata(hwif, pad);
 409                 return;
 410         }
 411
 412         pci_free_consistent(hwif->pci_dev,
 413                             IOC4_PRD_ENTRIES * IOC4_PRD_BYTES,
 414                             hwif->dmatable_cpu, hwif->dmatable_dma);
 415         printk(KERN_INFO
 416                "%s() -- Error! Unable to allocate DMA Maps for drive %s\n",
 417                __FUNCTION__, hwif->name);
 418         printk(KERN_INFO
 419                "Changing from DMA to PIO mode for Drive %s\n", hwif->name);
 420
 421 dma_pci_alloc_failure:
 422         iounmap(virt_dma_base);
 423
 424 dma_remap_failure:
 425         release_mem_region(dma_base, num_ports);
 426
 427 dma_alloc_failure:
 428         /* Disable DMA because we couldnot allocate any DMA maps */
 429         hwif->autodma = 0;
 430         hwif->atapi_dma = 0;
 431 }
 432
 433 /* Initializes the IOC4 DMA Engine */
 434 static void
 435 sgiioc4_configure_for_dma(int dma_direction, ide_drive_t * drive)
 436 {
 437         u32 ioc4_dma;
 438         ide_hwif_t *hwif = HWIF(drive);
 439         u64 dma_base = hwif->dma_base;
 440         u32 dma_addr, ending_dma_addr;
 441
 442         ioc4_dma = hwif->INL(dma_base + IOC4_DMA_CTRL * 4);
 443
 444         if (ioc4_dma & IOC4_S_DMA_ACTIVE) {
 445                 printk(KERN_WARNING
 446                         "%s(%s):Warning!! DMA from previous transfer was still active\n",
 447                        __FUNCTION__, drive->name);
 448                 hwif->OUTL(IOC4_S_DMA_STOP, dma_base + IOC4_DMA_CTRL * 4);
 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         ioc4_dma = hwif->INL(dma_base + IOC4_DMA_CTRL * 4);
 458         if (ioc4_dma & IOC4_S_DMA_ERROR) {
 459                 printk(KERN_WARNING
 460                        "%s(%s) : Warning!! - DMA Error during Previous"
 461                        " transfer | status 0x%x\n",
 462                        __FUNCTION__, drive->name, ioc4_dma);
 463                 hwif->OUTL(IOC4_S_DMA_STOP, dma_base + IOC4_DMA_CTRL * 4);
 464                 ioc4_dma = sgiioc4_ide_dma_stop(hwif, dma_base);
 465
 466                 if (ioc4_dma & IOC4_S_DMA_STOP)
 467                         printk(KERN_ERR
 468                                "%s(%s) : IOC4 DMA STOP bit is still 1\n",
 469                                __FUNCTION__, drive->name);
 470         }
 471
 472         /* Address of the Scatter Gather List */
 473         dma_addr = cpu_to_le32(hwif->dmatable_dma);
 474         hwif->OUTL(dma_addr, dma_base + IOC4_DMA_PTR_L * 4);
 475
 476         /* Address of the Ending DMA */
 477         memset(ide_get_hwifdata(hwif), 0, IOC4_IDE_CACHELINE_SIZE);
 478         ending_dma_addr = cpu_to_le32(hwif->dma_status);
 479         hwif->OUTL(ending_dma_addr, dma_base + IOC4_DMA_END_ADDR * 4);
 480
 481         hwif->OUTL(dma_direction, dma_base + IOC4_DMA_CTRL * 4);
 482         drive->waiting_for_dma = 1;
 483 }
 484
 485 /* IOC4 Scatter Gather list Format                                       */
 486 /* 128 Bit entries to support 64 bit addresses in the future             */
 487 /* The Scatter Gather list Entry should be in the BIG-ENDIAN Format      */
 488 /* --------------------------------------------------------------------- */
 489 /* | Upper 32 bits - Zero           |           Lower 32 bits- address | */
 490 /* --------------------------------------------------------------------- */
 491 /* | Upper 32 bits - Zero           |EOL| 15 unused     | 16 Bit Length| */
 492 /* --------------------------------------------------------------------- */
 493 /* Creates the scatter gather list, DMA Table */
 494 static unsigned int
 495 sgiioc4_build_dma_table(ide_drive_t * drive, struct request *rq, int ddir)
 496 {
 497         ide_hwif_t *hwif = HWIF(drive);
 498         unsigned int *table = hwif->dmatable_cpu;
 499         unsigned int count = 0, i = 1;
 500         struct scatterlist *sg;
 501
 502         hwif->sg_nents = i = ide_build_sglist(drive, rq);
 503
 504         if (!i)
 505                 return 0;       /* sglist of length Zero */
 506
 507         sg = hwif->sg_table;
 508         while (i && sg_dma_len(sg)) {
 509                 dma_addr_t cur_addr;
 510                 int cur_len;
 511                 cur_addr = sg_dma_address(sg);
 512                 cur_len = sg_dma_len(sg);
 513
 514                 while (cur_len) {
 515                         if (count++ >= IOC4_PRD_ENTRIES) {
 516                                 printk(KERN_WARNING
 517                                        "%s: DMA table too small\n",
 518                                        drive->name);
 519                                 goto use_pio_instead;
 520                         } else {
 521                                 u32 bcount =
 522                                     0x10000 - (cur_addr & 0xffff);
 523
 524                                 if (bcount > cur_len)
 525                                         bcount = cur_len;
 526
 527                                 /* put the addr, length in
 528                                  * the IOC4 dma-table format */
 529                                 *table = 0x0;
 530                                 table++;
 531                                 *table = cpu_to_be32(cur_addr);
 532                                 table++;
 533                                 *table = 0x0;
 534                                 table++;
 535
 536                                 *table = cpu_to_be32(bcount);
 537                                 table++;
 538
 539                                 cur_addr += bcount;
 540                                 cur_len -= bcount;
 541                         }
 542                 }
 543
 544                 sg++;
 545                 i--;
 546         }
 547
 548         if (count) {
 549                 table--;
 550                 *table |= cpu_to_be32(0x80000000);
 551                 return count;
 552         }
 553
 554 use_pio_instead:
 555         pci_unmap_sg(hwif->pci_dev, hwif->sg_table, hwif->sg_nents,
 556                      hwif->sg_dma_direction);
 557
 558         return 0;               /* revert to PIO for this request */
 559 }
 560
 561 static int sgiioc4_ide_dma_setup(ide_drive_t *drive)
 562 {
 563         struct request *rq = HWGROUP(drive)->rq;
 564         unsigned int count = 0;
 565         int ddir;
 566
 567         if (rq_data_dir(rq))
 568                 ddir = PCI_DMA_TODEVICE;
 569         else
 570                 ddir = PCI_DMA_FROMDEVICE;
 571
 572         if (!(count = sgiioc4_build_dma_table(drive, rq, ddir))) {
 573                 /* try PIO instead of DMA */
 574                 ide_map_sg(drive, rq);
 575                 return 1;
 576         }
 577
 578         if (rq_data_dir(rq))
 579                 /* Writes TO the IOC4 FROM Main Memory */
 580                 ddir = IOC4_DMA_READ;
 581         else
 582                 /* Writes FROM the IOC4 TO Main Memory */
 583                 ddir = IOC4_DMA_WRITE;
 584
 585         sgiioc4_configure_for_dma(ddir, drive);
 586
 587         return 0;
 588 }
 589
 590 static void __devinit
 591 ide_init_sgiioc4(ide_hwif_t * hwif)
 592 {
 593         hwif->mmio = 2;
 594         hwif->autodma = 1;
 595         hwif->atapi_dma = 1;
 596         hwif->ultra_mask = 0x0; /* Disable Ultra DMA */
 597         hwif->mwdma_mask = 0x2; /* Multimode-2 DMA  */
 598         hwif->swdma_mask = 0x2;
 599         hwif->tuneproc = NULL;  /* Sets timing for PIO mode */
 600         hwif->speedproc = NULL; /* Sets timing for DMA &/or PIO modes */
 601         hwif->selectproc = NULL;/* Use the default routine to select drive */
 602         hwif->reset_poll = NULL;/* No HBA specific reset_poll needed */
 603         hwif->pre_reset = NULL; /* No HBA specific pre_set needed */
 604         hwif->resetproc = &sgiioc4_resetproc;/* Reset DMA engine,
 605                                                 clear interrupts */
 606         hwif->intrproc = NULL;  /* Enable or Disable interrupt from drive */
 607         hwif->maskproc = &sgiioc4_maskproc;     /* Mask on/off NIEN register */
 608         hwif->quirkproc = NULL;
 609         hwif->busproc = NULL;
 610
 611         hwif->dma_setup = &sgiioc4_ide_dma_setup;
 612         hwif->dma_start = &sgiioc4_ide_dma_start;
 613         hwif->ide_dma_end = &sgiioc4_ide_dma_end;
 614         hwif->ide_dma_check = &sgiioc4_ide_dma_check;
 615         hwif->ide_dma_on = &sgiioc4_ide_dma_on;
 616         hwif->ide_dma_off_quietly = &sgiioc4_ide_dma_off_quietly;
 617         hwif->ide_dma_test_irq = &sgiioc4_ide_dma_test_irq;
 618         hwif->ide_dma_host_on = &sgiioc4_ide_dma_host_on;
 619         hwif->ide_dma_host_off = &sgiioc4_ide_dma_host_off;
 620         hwif->ide_dma_lostirq = &sgiioc4_ide_dma_lostirq;
 621         hwif->ide_dma_timeout = &__ide_dma_timeout;
 622
 623         hwif->INB = &sgiioc4_INB;
 624 }
 625
 626 static int __devinit
 627 sgiioc4_ide_setup_pci_device(struct pci_dev *dev, ide_pci_device_t * d)
 628 {
 629         unsigned long cmd_base, dma_base, irqport;
 630         unsigned long bar0, cmd_phys_base, ctl;
 631         void __iomem *virt_base;
 632         ide_hwif_t *hwif;
 633         int h;
 634
 635         /*
 636          * Find an empty HWIF; if none available, return -ENOMEM.
 637          */
 638         for (h = 0; h < MAX_HWIFS; ++h) {
 639                 hwif = &ide_hwifs[h];
 640                 if (hwif->chipset == ide_unknown)
 641                         break;
 642         }
 643         if (h == MAX_HWIFS) {
 644                 printk(KERN_ERR "%s: too many IDE interfaces, no room in table\n", d->name);
 645                 return -ENOMEM;
 646         }
 647
 648         /*  Get the CmdBlk and CtrlBlk Base Registers */
 649         bar0 = pci_resource_start(dev, 0);
 650         virt_base = ioremap(bar0, pci_resource_len(dev, 0));
 651         if (virt_base == NULL) {
 652                 printk(KERN_ERR "%s: Unable to remap BAR 0 address: 0x%lx\n",
 653                         d->name, bar0);
 654                 return -ENOMEM;
 655         }
 656         cmd_base = (unsigned long) virt_base + IOC4_CMD_OFFSET;
 657         ctl = (unsigned long) virt_base + IOC4_CTRL_OFFSET;
 658         irqport = (unsigned long) virt_base + IOC4_INTR_OFFSET;
 659         dma_base = pci_resource_start(dev, 0) + IOC4_DMA_OFFSET;
 660
 661         cmd_phys_base = bar0 + IOC4_CMD_OFFSET;
 662         if (!request_mem_region(cmd_phys_base, IOC4_CMD_CTL_BLK_SIZE,
 663             hwif->name)) {
 664                 printk(KERN_ERR
 665                         "%s : %s -- ERROR, Addresses "
 666                         "0x%p to 0x%p ALREADY in use\n",
 667                        __FUNCTION__, hwif->name, (void *) cmd_phys_base,
 668                        (void *) cmd_phys_base + IOC4_CMD_CTL_BLK_SIZE);
 669                 return -ENOMEM;
 670         }
 671
 672         if (hwif->io_ports[IDE_DATA_OFFSET] != cmd_base) {
 673                 /* Initialize the IO registers */
 674                 sgiioc4_init_hwif_ports(&hwif->hw, cmd_base, ctl, irqport);
 675                 memcpy(hwif->io_ports, hwif->hw.io_ports,
 676                        sizeof (hwif->io_ports));
 677                 hwif->noprobe = !hwif->io_ports[IDE_DATA_OFFSET];
 678         }
 679
 680         hwif->irq = dev->irq;
 681         hwif->chipset = ide_pci;
 682         hwif->pci_dev = dev;
 683         hwif->channel = 0;      /* Single Channel chip */
 684         hwif->cds = (struct ide_pci_device_s *) d;
 685         hwif->gendev.parent = &dev->dev;/* setup proper ancestral information */
 686
 687         /* The IOC4 uses MMIO rather than Port IO. */
 688         default_hwif_mmiops(hwif);
 689
 690         /* Initializing chipset IRQ Registers */
 691         hwif->OUTL(0x03, irqport + IOC4_INTR_SET * 4);
 692
 693         ide_init_sgiioc4(hwif);
 694
 695         if (dma_base)
 696                 ide_dma_sgiioc4(hwif, dma_base);
 697         else
 698                 printk(KERN_INFO "%s: %s Bus-Master DMA disabled\n",
 699                        hwif->name, d->name);
 700
 701         if (probe_hwif_init(hwif))
 702                 return -EIO;
 703
 704         /* Create /proc/ide entries */
 705         create_proc_ide_interfaces();
 706
 707         return 0;
 708 }
 709
 710 static unsigned int __devinit
 711 pci_init_sgiioc4(struct pci_dev *dev, ide_pci_device_t * d)
 712 {
 713         unsigned int class_rev;
 714         int ret;
 715
 716         pci_read_config_dword(dev, PCI_CLASS_REVISION, &class_rev);
 717         class_rev &= 0xff;
 718         printk(KERN_INFO "%s: IDE controller at PCI slot %s, revision %d\n",
 719                         d->name, pci_name(dev), class_rev);
 720         if (class_rev < IOC4_SUPPORTED_FIRMWARE_REV) {
 721                 printk(KERN_ERR "Skipping %s IDE controller in slot %s: "
 722                         "firmware is obsolete - please upgrade to revision"
 723                         "46 or higher\n", d->name, pci_name(dev));
 724                 ret = -EAGAIN;
 725                 goto out;
 726         }
 727         ret = sgiioc4_ide_setup_pci_device(dev, d);
 728 out:
 729         return ret;
 730 }
 731
 732 static ide_pci_device_t sgiioc4_chipsets[] __devinitdata = {
 733         {
 734          /* Channel 0 */
 735          .name = "SGIIOC4",
 736          .init_hwif = ide_init_sgiioc4,
 737          .init_dma = ide_dma_sgiioc4,
 738          .channels = 1,
 739          .autodma = AUTODMA,
 740          /* SGI IOC4 doesn't have enablebits. */
 741          .bootable = ON_BOARD,
 742         }
 743 };
 744
 745 int
 746 ioc4_ide_attach_one(struct ioc4_driver_data *idd)
 747 {
 748         /* PCI-RT does not bring out IDE connection.
 749          * Do not attach to this particular IOC4.
 750          */
 751         if (idd->idd_variant == IOC4_VARIANT_PCI_RT)
 752                 return 0;
 753
 754         return pci_init_sgiioc4(idd->idd_pdev,
 755                                 &sgiioc4_chipsets[idd->idd_pci_id->driver_data]);
 756 }
 757
 758 static struct ioc4_submodule ioc4_ide_submodule = {
 759         .is_name = "IOC4_ide",
 760         .is_owner = THIS_MODULE,
 761         .is_probe = ioc4_ide_attach_one,
 762 /*      .is_remove = ioc4_ide_remove_one,       */
 763 };
 764
 765 static int __devinit
 766 ioc4_ide_init(void)
 767 {
 768         return ioc4_register_submodule(&ioc4_ide_submodule);
 769 }
 770
 771 late_initcall(ioc4_ide_init); /* Call only after IDE init is done */
 772
 773 MODULE_AUTHOR("Aniket Malatpure/Jeremy Higdon");
 774 MODULE_DESCRIPTION("IDE PCI driver module for SGI IOC4 Base-IO Card");
 775 MODULE_LICENSE("GPL");