git.oblomov.eu Git - linux-2.6/blob - 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         writeb(mask ? (drive->ctl | 2) : (drive->ctl & ~2),
 114                (void __iomem *)IDE_CONTROL_REG);
 115 }
 116
 117
 118 static int
 119 sgiioc4_checkirq(ide_hwif_t * hwif)
 120 {
 121         unsigned long intr_addr =
 122                 hwif->io_ports[IDE_IRQ_OFFSET] + 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_INB(unsigned long);
 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 = readl((void __iomem *)other_ir);
 142         if (intr_reg & 0x03) { /* Valid IOC4-IDE interrupt */
 143                 /*
 144                  * Using sgiioc4_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 = sgiioc4_INB(IDE_STATUS_REG);
 151                 int count = 0;
 152                 stat = sgiioc4_INB(IDE_STATUS_REG);
 153                 while ((stat & 0x80) && (count++ < 100)) {
 154                         udelay(1);
 155                         stat = sgiioc4_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                                 readl((void __iomem *)hwif->io_ports[IDE_IRQ_OFFSET]);
 165                         pci_err_addr_high =
 166                                 readl((void __iomem *)(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                 writel(0x03, (void __iomem *)other_ir);
 184
 185                 intr_reg = readl((void __iomem *)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 long ioc4_dma_addr = hwif->dma_base + IOC4_DMA_CTRL * 4;
 195         unsigned int reg = readl((void __iomem *)ioc4_dma_addr);
 196         unsigned int temp_reg = reg | IOC4_S_DMA_START;
 197
 198         writel(temp_reg, (void __iomem *)ioc4_dma_addr);
 199 }
 200
 201 static u32
 202 sgiioc4_ide_dma_stop(ide_hwif_t *hwif, u64 dma_base)
 203 {
 204         unsigned long ioc4_dma_addr = dma_base + IOC4_DMA_CTRL * 4;
 205         u32     ioc4_dma;
 206         int     count;
 207
 208         count = 0;
 209         ioc4_dma = readl((void __iomem *)ioc4_dma_addr);
 210         while ((ioc4_dma & IOC4_S_DMA_STOP) && (count++ < 200)) {
 211                 udelay(1);
 212                 ioc4_dma = readl((void __iomem *)ioc4_dma_addr);
 213         }
 214         return ioc4_dma;
 215 }
 216
 217 /* Stops the IOC4 DMA Engine */
 218 static int
 219 sgiioc4_ide_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                        __FUNCTION__, 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", __FUNCTION__,
 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                                __FUNCTION__, 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 int
 278 sgiioc4_ide_dma_on(ide_drive_t * drive)
 279 {
 280         drive->using_dma = 1;
 281
 282         return HWIF(drive)->ide_dma_host_on(drive);
 283 }
 284
 285 static int
 286 sgiioc4_ide_dma_off_quietly(ide_drive_t * drive)
 287 {
 288         drive->using_dma = 0;
 289
 290         return HWIF(drive)->ide_dma_host_off(drive);
 291 }
 292
 293 static int sgiioc4_ide_dma_check(ide_drive_t *drive)
 294 {
 295         /* FIXME: check for available DMA modes */
 296         if (ide_config_drive_speed(drive, XFER_MW_DMA_2) != 0) {
 297                 printk(KERN_WARNING "%s: couldn't set MWDMA2 mode, "
 298                                     "using PIO instead\n", drive->name);
 299                 return sgiioc4_ide_dma_off_quietly(drive);
 300         } else
 301                 return sgiioc4_ide_dma_on(drive);
 302 }
 303
 304 /* returns 1 if dma irq issued, 0 otherwise */
 305 static int
 306 sgiioc4_ide_dma_test_irq(ide_drive_t * drive)
 307 {
 308         return sgiioc4_checkirq(HWIF(drive));
 309 }
 310
 311 static int
 312 sgiioc4_ide_dma_host_on(ide_drive_t * drive)
 313 {
 314         if (drive->using_dma)
 315                 return 0;
 316
 317         return 1;
 318 }
 319
 320 static int
 321 sgiioc4_ide_dma_host_off(ide_drive_t * drive)
 322 {
 323         sgiioc4_clearirq(drive);
 324
 325         return 0;
 326 }
 327
 328 static int
 329 sgiioc4_ide_dma_lostirq(ide_drive_t * drive)
 330 {
 331         HWIF(drive)->resetproc(drive);
 332
 333         return __ide_dma_lostirq(drive);
 334 }
 335
 336 static void
 337 sgiioc4_resetproc(ide_drive_t * drive)
 338 {
 339         sgiioc4_ide_dma_end(drive);
 340         sgiioc4_clearirq(drive);
 341 }
 342
 343 static u8
 344 sgiioc4_INB(unsigned long port)
 345 {
 346         u8 reg = (u8) readb((void __iomem *) port);
 347
 348         if ((port & 0xFFF) == 0x11C) {  /* Status register of IOC4 */
 349                 if (reg & 0x51) {       /* Not busy...check for interrupt */
 350                         unsigned long other_ir = port - 0x110;
 351                         unsigned int intr_reg = (u32) readl((void __iomem *) other_ir);
 352
 353                         /* Clear the Interrupt, Error bits on the IOC4 */
 354                         if (intr_reg & 0x03) {
 355                                 writel(0x03, (void __iomem *) other_ir);
 356                                 intr_reg = (u32) readl((void __iomem *) other_ir);
 357                         }
 358                 }
 359         }
 360
 361         return reg;
 362 }
 363
 364 /* Creates a dma map for the scatter-gather list entries */
 365 static void __devinit
 366 ide_dma_sgiioc4(ide_hwif_t * hwif, unsigned long dma_base)
 367 {
 368         void __iomem *virt_dma_base;
 369         int num_ports = sizeof (ioc4_dma_regs_t);
 370         void *pad;
 371
 372         printk(KERN_INFO "%s: BM-DMA at 0x%04lx-0x%04lx\n", hwif->name,
 373                dma_base, dma_base + num_ports - 1);
 374
 375         if (!request_mem_region(dma_base, num_ports, hwif->name)) {
 376                 printk(KERN_ERR
 377                        "%s(%s) -- ERROR, Addresses 0x%p to 0x%p "
 378                        "ALREADY in use\n",
 379                        __FUNCTION__, hwif->name, (void *) dma_base,
 380                        (void *) dma_base + num_ports - 1);
 381                 goto dma_alloc_failure;
 382         }
 383
 384         virt_dma_base = ioremap(dma_base, num_ports);
 385         if (virt_dma_base == NULL) {
 386                 printk(KERN_ERR
 387                        "%s(%s) -- ERROR, Unable to map addresses 0x%lx to 0x%lx\n",
 388                        __FUNCTION__, hwif->name, dma_base, dma_base + num_ports - 1);
 389                 goto dma_remap_failure;
 390         }
 391         hwif->dma_base = (unsigned long) virt_dma_base;
 392
 393         hwif->dmatable_cpu = pci_alloc_consistent(hwif->pci_dev,
 394                                           IOC4_PRD_ENTRIES * IOC4_PRD_BYTES,
 395                                           &hwif->dmatable_dma);
 396
 397         if (!hwif->dmatable_cpu)
 398                 goto dma_pci_alloc_failure;
 399
 400         hwif->sg_max_nents = IOC4_PRD_ENTRIES;
 401
 402         pad = pci_alloc_consistent(hwif->pci_dev, IOC4_IDE_CACHELINE_SIZE,
 403                                    (dma_addr_t *) &(hwif->dma_status));
 404
 405         if (pad) {
 406                 ide_set_hwifdata(hwif, pad);
 407                 return;
 408         }
 409
 410         pci_free_consistent(hwif->pci_dev,
 411                             IOC4_PRD_ENTRIES * IOC4_PRD_BYTES,
 412                             hwif->dmatable_cpu, hwif->dmatable_dma);
 413         printk(KERN_INFO
 414                "%s() -- Error! Unable to allocate DMA Maps for drive %s\n",
 415                __FUNCTION__, hwif->name);
 416         printk(KERN_INFO
 417                "Changing from DMA to PIO mode for Drive %s\n", hwif->name);
 418
 419 dma_pci_alloc_failure:
 420         iounmap(virt_dma_base);
 421
 422 dma_remap_failure:
 423         release_mem_region(dma_base, num_ports);
 424
 425 dma_alloc_failure:
 426         /* Disable DMA because we couldnot allocate any DMA maps */
 427         hwif->autodma = 0;
 428         hwif->atapi_dma = 0;
 429 }
 430
 431 /* Initializes the IOC4 DMA Engine */
 432 static void
 433 sgiioc4_configure_for_dma(int dma_direction, ide_drive_t * drive)
 434 {
 435         u32 ioc4_dma;
 436         ide_hwif_t *hwif = HWIF(drive);
 437         unsigned long dma_base = hwif->dma_base;
 438         unsigned long ioc4_dma_addr = dma_base + IOC4_DMA_CTRL * 4;
 439         u32 dma_addr, ending_dma_addr;
 440
 441         ioc4_dma = readl((void __iomem *)ioc4_dma_addr);
 442
 443         if (ioc4_dma & IOC4_S_DMA_ACTIVE) {
 444                 printk(KERN_WARNING
 445                         "%s(%s):Warning!! DMA from previous transfer was still active\n",
 446                        __FUNCTION__, drive->name);
 447                 writel(IOC4_S_DMA_STOP, (void __iomem *)ioc4_dma_addr);
 448                 ioc4_dma = sgiioc4_ide_dma_stop(hwif, dma_base);
 449
 450                 if (ioc4_dma & IOC4_S_DMA_STOP)
 451                         printk(KERN_ERR
 452                                "%s(%s) : IOC4 Dma STOP bit is still 1\n",
 453                                __FUNCTION__, drive->name);
 454         }
 455
 456         ioc4_dma = readl((void __iomem *)ioc4_dma_addr);
 457         if (ioc4_dma & IOC4_S_DMA_ERROR) {
 458                 printk(KERN_WARNING
 459                        "%s(%s) : Warning!! - DMA Error during Previous"
 460                        " transfer | status 0x%x\n",
 461                        __FUNCTION__, drive->name, ioc4_dma);
 462                 writel(IOC4_S_DMA_STOP, (void __iomem *)ioc4_dma_addr);
 463                 ioc4_dma = sgiioc4_ide_dma_stop(hwif, dma_base);
 464
 465                 if (ioc4_dma & IOC4_S_DMA_STOP)
 466                         printk(KERN_ERR
 467                                "%s(%s) : IOC4 DMA STOP bit is still 1\n",
 468                                __FUNCTION__, drive->name);
 469         }
 470
 471         /* Address of the Scatter Gather List */
 472         dma_addr = cpu_to_le32(hwif->dmatable_dma);
 473         writel(dma_addr, (void __iomem *)(dma_base + IOC4_DMA_PTR_L * 4));
 474
 475         /* Address of the Ending DMA */
 476         memset(ide_get_hwifdata(hwif), 0, IOC4_IDE_CACHELINE_SIZE);
 477         ending_dma_addr = cpu_to_le32(hwif->dma_status);
 478         writel(ending_dma_addr, (void __iomem *)(dma_base + IOC4_DMA_END_ADDR * 4));
 479
 480         writel(dma_direction, (void __iomem *)ioc4_dma_addr);
 481         drive->waiting_for_dma = 1;
 482 }
 483
 484 /* IOC4 Scatter Gather list Format                                       */
 485 /* 128 Bit entries to support 64 bit addresses in the future             */
 486 /* The Scatter Gather list Entry should be in the BIG-ENDIAN Format      */
 487 /* --------------------------------------------------------------------- */
 488 /* | Upper 32 bits - Zero           |           Lower 32 bits- address | */
 489 /* --------------------------------------------------------------------- */
 490 /* | Upper 32 bits - Zero           |EOL| 15 unused     | 16 Bit Length| */
 491 /* --------------------------------------------------------------------- */
 492 /* Creates the scatter gather list, DMA Table */
 493 static unsigned int
 494 sgiioc4_build_dma_table(ide_drive_t * drive, struct request *rq, int ddir)
 495 {
 496         ide_hwif_t *hwif = HWIF(drive);
 497         unsigned int *table = hwif->dmatable_cpu;
 498         unsigned int count = 0, i = 1;
 499         struct scatterlist *sg;
 500
 501         hwif->sg_nents = i = ide_build_sglist(drive, rq);
 502
 503         if (!i)
 504                 return 0;       /* sglist of length Zero */
 505
 506         sg = hwif->sg_table;
 507         while (i && sg_dma_len(sg)) {
 508                 dma_addr_t cur_addr;
 509                 int cur_len;
 510                 cur_addr = sg_dma_address(sg);
 511                 cur_len = sg_dma_len(sg);
 512
 513                 while (cur_len) {
 514                         if (count++ >= IOC4_PRD_ENTRIES) {
 515                                 printk(KERN_WARNING
 516                                        "%s: DMA table too small\n",
 517                                        drive->name);
 518                                 goto use_pio_instead;
 519                         } else {
 520                                 u32 bcount =
 521                                     0x10000 - (cur_addr & 0xffff);
 522
 523                                 if (bcount > cur_len)
 524                                         bcount = cur_len;
 525
 526                                 /* put the addr, length in
 527                                  * the IOC4 dma-table format */
 528                                 *table = 0x0;
 529                                 table++;
 530                                 *table = cpu_to_be32(cur_addr);
 531                                 table++;
 532                                 *table = 0x0;
 533                                 table++;
 534
 535                                 *table = cpu_to_be32(bcount);
 536                                 table++;
 537
 538                                 cur_addr += bcount;
 539                                 cur_len -= bcount;
 540                         }
 541                 }
 542
 543                 sg++;
 544                 i--;
 545         }
 546
 547         if (count) {
 548                 table--;
 549                 *table |= cpu_to_be32(0x80000000);
 550                 return count;
 551         }
 552
 553 use_pio_instead:
 554         pci_unmap_sg(hwif->pci_dev, hwif->sg_table, hwif->sg_nents,
 555                      hwif->sg_dma_direction);
 556
 557         return 0;               /* revert to PIO for this request */
 558 }
 559
 560 static int sgiioc4_ide_dma_setup(ide_drive_t *drive)
 561 {
 562         struct request *rq = HWGROUP(drive)->rq;
 563         unsigned int count = 0;
 564         int ddir;
 565
 566         if (rq_data_dir(rq))
 567                 ddir = PCI_DMA_TODEVICE;
 568         else
 569                 ddir = PCI_DMA_FROMDEVICE;
 570
 571         if (!(count = sgiioc4_build_dma_table(drive, rq, ddir))) {
 572                 /* try PIO instead of DMA */
 573                 ide_map_sg(drive, rq);
 574                 return 1;
 575         }
 576
 577         if (rq_data_dir(rq))
 578                 /* Writes TO the IOC4 FROM Main Memory */
 579                 ddir = IOC4_DMA_READ;
 580         else
 581                 /* Writes FROM the IOC4 TO Main Memory */
 582                 ddir = IOC4_DMA_WRITE;
 583
 584         sgiioc4_configure_for_dma(ddir, drive);
 585
 586         return 0;
 587 }
 588
 589 static void __devinit
 590 ide_init_sgiioc4(ide_hwif_t * hwif)
 591 {
 592         hwif->mmio = 1;
 593         hwif->autodma = 1;
 594         hwif->atapi_dma = 1;
 595         hwif->ultra_mask = 0x0; /* Disable Ultra DMA */
 596         hwif->mwdma_mask = 0x2; /* Multimode-2 DMA  */
 597         hwif->swdma_mask = 0x2;
 598         hwif->tuneproc = NULL;  /* Sets timing for PIO mode */
 599         hwif->speedproc = NULL; /* Sets timing for DMA &/or PIO modes */
 600         hwif->selectproc = NULL;/* Use the default routine to select drive */
 601         hwif->reset_poll = NULL;/* No HBA specific reset_poll needed */
 602         hwif->pre_reset = NULL; /* No HBA specific pre_set needed */
 603         hwif->resetproc = &sgiioc4_resetproc;/* Reset DMA engine,
 604                                                 clear interrupts */
 605         hwif->intrproc = NULL;  /* Enable or Disable interrupt from drive */
 606         hwif->maskproc = &sgiioc4_maskproc;     /* Mask on/off NIEN register */
 607         hwif->quirkproc = NULL;
 608         hwif->busproc = NULL;
 609
 610         hwif->dma_setup = &sgiioc4_ide_dma_setup;
 611         hwif->dma_start = &sgiioc4_ide_dma_start;
 612         hwif->ide_dma_end = &sgiioc4_ide_dma_end;
 613         hwif->ide_dma_check = &sgiioc4_ide_dma_check;
 614         hwif->ide_dma_on = &sgiioc4_ide_dma_on;
 615         hwif->ide_dma_off_quietly = &sgiioc4_ide_dma_off_quietly;
 616         hwif->ide_dma_test_irq = &sgiioc4_ide_dma_test_irq;
 617         hwif->ide_dma_host_on = &sgiioc4_ide_dma_host_on;
 618         hwif->ide_dma_host_off = &sgiioc4_ide_dma_host_off;
 619         hwif->ide_dma_lostirq = &sgiioc4_ide_dma_lostirq;
 620         hwif->ide_dma_timeout = &__ide_dma_timeout;
 621
 622         hwif->INB = &sgiioc4_INB;
 623 }
 624
 625 static int __devinit
 626 sgiioc4_ide_setup_pci_device(struct pci_dev *dev, ide_pci_device_t * d)
 627 {
 628         unsigned long cmd_base, dma_base, irqport;
 629         unsigned long bar0, cmd_phys_base, ctl;
 630         void __iomem *virt_base;
 631         ide_hwif_t *hwif;
 632         int h;
 633
 634         /*
 635          * Find an empty HWIF; if none available, return -ENOMEM.
 636          */
 637         for (h = 0; h < MAX_HWIFS; ++h) {
 638                 hwif = &ide_hwifs[h];
 639                 if (hwif->chipset == ide_unknown)
 640                         break;
 641         }
 642         if (h == MAX_HWIFS) {
 643                 printk(KERN_ERR "%s: too many IDE interfaces, no room in table\n", d->name);
 644                 return -ENOMEM;
 645         }
 646
 647         /*  Get the CmdBlk and CtrlBlk Base Registers */
 648         bar0 = pci_resource_start(dev, 0);
 649         virt_base = ioremap(bar0, pci_resource_len(dev, 0));
 650         if (virt_base == NULL) {
 651                 printk(KERN_ERR "%s: Unable to remap BAR 0 address: 0x%lx\n",
 652                         d->name, bar0);
 653                 return -ENOMEM;
 654         }
 655         cmd_base = (unsigned long) virt_base + IOC4_CMD_OFFSET;
 656         ctl = (unsigned long) virt_base + IOC4_CTRL_OFFSET;
 657         irqport = (unsigned long) virt_base + IOC4_INTR_OFFSET;
 658         dma_base = pci_resource_start(dev, 0) + IOC4_DMA_OFFSET;
 659
 660         cmd_phys_base = bar0 + IOC4_CMD_OFFSET;
 661         if (!request_mem_region(cmd_phys_base, IOC4_CMD_CTL_BLK_SIZE,
 662             hwif->name)) {
 663                 printk(KERN_ERR
 664                         "%s : %s -- ERROR, Addresses "
 665                         "0x%p to 0x%p ALREADY in use\n",
 666                        __FUNCTION__, hwif->name, (void *) cmd_phys_base,
 667                        (void *) cmd_phys_base + IOC4_CMD_CTL_BLK_SIZE);
 668                 return -ENOMEM;
 669         }
 670
 671         if (hwif->io_ports[IDE_DATA_OFFSET] != cmd_base) {
 672                 /* Initialize the IO registers */
 673                 sgiioc4_init_hwif_ports(&hwif->hw, cmd_base, ctl, irqport);
 674                 memcpy(hwif->io_ports, hwif->hw.io_ports,
 675                        sizeof (hwif->io_ports));
 676                 hwif->noprobe = !hwif->io_ports[IDE_DATA_OFFSET];
 677         }
 678
 679         hwif->irq = dev->irq;
 680         hwif->chipset = ide_pci;
 681         hwif->pci_dev = dev;
 682         hwif->channel = 0;      /* Single Channel chip */
 683         hwif->cds = (struct ide_pci_device_s *) d;
 684         hwif->gendev.parent = &dev->dev;/* setup proper ancestral information */
 685
 686         /* The IOC4 uses MMIO rather than Port IO. */
 687         default_hwif_mmiops(hwif);
 688
 689         /* Initializing chipset IRQ Registers */
 690         writel(0x03, (void __iomem *)(irqport + IOC4_INTR_SET * 4));
 691
 692         ide_init_sgiioc4(hwif);
 693
 694         if (dma_base)
 695                 ide_dma_sgiioc4(hwif, dma_base);
 696         else
 697                 printk(KERN_INFO "%s: %s Bus-Master DMA disabled\n",
 698                        hwif->name, d->name);
 699
 700         if (probe_hwif_init(hwif))
 701                 return -EIO;
 702
 703         /* Create /proc/ide entries */
 704         create_proc_ide_interfaces();
 705
 706         return 0;
 707 }
 708
 709 static unsigned int __devinit
 710 pci_init_sgiioc4(struct pci_dev *dev, ide_pci_device_t * d)
 711 {
 712         unsigned int class_rev;
 713         int ret;
 714
 715         pci_read_config_dword(dev, PCI_CLASS_REVISION, &class_rev);
 716         class_rev &= 0xff;
 717         printk(KERN_INFO "%s: IDE controller at PCI slot %s, revision %d\n",
 718                         d->name, pci_name(dev), class_rev);
 719         if (class_rev < IOC4_SUPPORTED_FIRMWARE_REV) {
 720                 printk(KERN_ERR "Skipping %s IDE controller in slot %s: "
 721                         "firmware is obsolete - please upgrade to revision"
 722                         "46 or higher\n", d->name, pci_name(dev));
 723                 ret = -EAGAIN;
 724                 goto out;
 725         }
 726         ret = sgiioc4_ide_setup_pci_device(dev, d);
 727 out:
 728         return ret;
 729 }
 730
 731 static ide_pci_device_t sgiioc4_chipset __devinitdata = {
 732          /* Channel 0 */
 733          .name = "SGIIOC4",
 734          .init_hwif = ide_init_sgiioc4,
 735          .init_dma = ide_dma_sgiioc4,
 736          .channels = 1,
 737          .autodma = AUTODMA,
 738          /* SGI IOC4 doesn't have enablebits. */
 739          .bootable = ON_BOARD,
 740 };
 741
 742 int
 743 ioc4_ide_attach_one(struct ioc4_driver_data *idd)
 744 {
 745         /* PCI-RT does not bring out IDE connection.
 746          * Do not attach to this particular IOC4.
 747          */
 748         if (idd->idd_variant == IOC4_VARIANT_PCI_RT)
 749                 return 0;
 750
 751         return pci_init_sgiioc4(idd->idd_pdev, &sgiioc4_chipset);
 752 }
 753
 754 static struct ioc4_submodule ioc4_ide_submodule = {
 755         .is_name = "IOC4_ide",
 756         .is_owner = THIS_MODULE,
 757         .is_probe = ioc4_ide_attach_one,
 758 /*      .is_remove = ioc4_ide_remove_one,       */
 759 };
 760
 761 static int __init ioc4_ide_init(void)
 762 {
 763         return ioc4_register_submodule(&ioc4_ide_submodule);
 764 }
 765
 766 late_initcall(ioc4_ide_init); /* Call only after IDE init is done */
 767
 768 MODULE_AUTHOR("Aniket Malatpure/Jeremy Higdon");
 769 MODULE_DESCRIPTION("IDE PCI driver module for SGI IOC4 Base-IO Card");
 770 MODULE_LICENSE("GPL");