ide: use PIO/MMIO operations directly where possible (v2)
[linux-2.6] / 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_check(ide_drive_t * drive)
279 {
280         if (ide_config_drive_speed(drive, XFER_MW_DMA_2) != 0) {
281                 printk(KERN_INFO
282                        "Couldnot set %s in Multimode-2 DMA mode | "
283                            "Drive %s using PIO instead\n",
284                        drive->name, drive->name);
285                 drive->using_dma = 0;
286         } else
287                 drive->using_dma = 1;
288
289         return 0;
290 }
291
292 static int
293 sgiioc4_ide_dma_on(ide_drive_t * drive)
294 {
295         drive->using_dma = 1;
296
297         return HWIF(drive)->ide_dma_host_on(drive);
298 }
299
300 static int
301 sgiioc4_ide_dma_off_quietly(ide_drive_t * drive)
302 {
303         drive->using_dma = 0;
304
305         return HWIF(drive)->ide_dma_host_off(drive);
306 }
307
308 /* returns 1 if dma irq issued, 0 otherwise */
309 static int
310 sgiioc4_ide_dma_test_irq(ide_drive_t * drive)
311 {
312         return sgiioc4_checkirq(HWIF(drive));
313 }
314
315 static int
316 sgiioc4_ide_dma_host_on(ide_drive_t * drive)
317 {
318         if (drive->using_dma)
319                 return 0;
320
321         return 1;
322 }
323
324 static int
325 sgiioc4_ide_dma_host_off(ide_drive_t * drive)
326 {
327         sgiioc4_clearirq(drive);
328
329         return 0;
330 }
331
332 static int
333 sgiioc4_ide_dma_lostirq(ide_drive_t * drive)
334 {
335         HWIF(drive)->resetproc(drive);
336
337         return __ide_dma_lostirq(drive);
338 }
339
340 static void
341 sgiioc4_resetproc(ide_drive_t * drive)
342 {
343         sgiioc4_ide_dma_end(drive);
344         sgiioc4_clearirq(drive);
345 }
346
347 static u8
348 sgiioc4_INB(unsigned long port)
349 {
350         u8 reg = (u8) readb((void __iomem *) port);
351
352         if ((port & 0xFFF) == 0x11C) {  /* Status register of IOC4 */
353                 if (reg & 0x51) {       /* Not busy...check for interrupt */
354                         unsigned long other_ir = port - 0x110;
355                         unsigned int intr_reg = (u32) readl((void __iomem *) other_ir);
356
357                         /* Clear the Interrupt, Error bits on the IOC4 */
358                         if (intr_reg & 0x03) {
359                                 writel(0x03, (void __iomem *) other_ir);
360                                 intr_reg = (u32) readl((void __iomem *) other_ir);
361                         }
362                 }
363         }
364
365         return reg;
366 }
367
368 /* Creates a dma map for the scatter-gather list entries */
369 static void __devinit
370 ide_dma_sgiioc4(ide_hwif_t * hwif, unsigned long dma_base)
371 {
372         void __iomem *virt_dma_base;
373         int num_ports = sizeof (ioc4_dma_regs_t);
374         void *pad;
375
376         printk(KERN_INFO "%s: BM-DMA at 0x%04lx-0x%04lx\n", hwif->name,
377                dma_base, dma_base + num_ports - 1);
378
379         if (!request_mem_region(dma_base, num_ports, hwif->name)) {
380                 printk(KERN_ERR
381                        "%s(%s) -- ERROR, Addresses 0x%p to 0x%p "
382                        "ALREADY in use\n",
383                        __FUNCTION__, hwif->name, (void *) dma_base,
384                        (void *) dma_base + num_ports - 1);
385                 goto dma_alloc_failure;
386         }
387
388         virt_dma_base = ioremap(dma_base, num_ports);
389         if (virt_dma_base == NULL) {
390                 printk(KERN_ERR
391                        "%s(%s) -- ERROR, Unable to map addresses 0x%lx to 0x%lx\n",
392                        __FUNCTION__, hwif->name, dma_base, dma_base + num_ports - 1);
393                 goto dma_remap_failure;
394         }
395         hwif->dma_base = (unsigned long) virt_dma_base;
396
397         hwif->dmatable_cpu = pci_alloc_consistent(hwif->pci_dev,
398                                           IOC4_PRD_ENTRIES * IOC4_PRD_BYTES,
399                                           &hwif->dmatable_dma);
400
401         if (!hwif->dmatable_cpu)
402                 goto dma_pci_alloc_failure;
403
404         hwif->sg_max_nents = IOC4_PRD_ENTRIES;
405
406         pad = pci_alloc_consistent(hwif->pci_dev, IOC4_IDE_CACHELINE_SIZE,
407                                    (dma_addr_t *) &(hwif->dma_status));
408
409         if (pad) {
410                 ide_set_hwifdata(hwif, pad);
411                 return;
412         }
413
414         pci_free_consistent(hwif->pci_dev,
415                             IOC4_PRD_ENTRIES * IOC4_PRD_BYTES,
416                             hwif->dmatable_cpu, hwif->dmatable_dma);
417         printk(KERN_INFO
418                "%s() -- Error! Unable to allocate DMA Maps for drive %s\n",
419                __FUNCTION__, hwif->name);
420         printk(KERN_INFO
421                "Changing from DMA to PIO mode for Drive %s\n", hwif->name);
422
423 dma_pci_alloc_failure:
424         iounmap(virt_dma_base);
425
426 dma_remap_failure:
427         release_mem_region(dma_base, num_ports);
428
429 dma_alloc_failure:
430         /* Disable DMA because we couldnot allocate any DMA maps */
431         hwif->autodma = 0;
432         hwif->atapi_dma = 0;
433 }
434
435 /* Initializes the IOC4 DMA Engine */
436 static void
437 sgiioc4_configure_for_dma(int dma_direction, ide_drive_t * drive)
438 {
439         u32 ioc4_dma;
440         ide_hwif_t *hwif = HWIF(drive);
441         unsigned long dma_base = hwif->dma_base;
442         unsigned long ioc4_dma_addr = dma_base + IOC4_DMA_CTRL * 4;
443         u32 dma_addr, ending_dma_addr;
444
445         ioc4_dma = readl((void __iomem *)ioc4_dma_addr);
446
447         if (ioc4_dma & IOC4_S_DMA_ACTIVE) {
448                 printk(KERN_WARNING
449                         "%s(%s):Warning!! DMA from previous transfer was still active\n",
450                        __FUNCTION__, drive->name);
451                 writel(IOC4_S_DMA_STOP, (void __iomem *)ioc4_dma_addr);
452                 ioc4_dma = sgiioc4_ide_dma_stop(hwif, dma_base);
453
454                 if (ioc4_dma & IOC4_S_DMA_STOP)
455                         printk(KERN_ERR
456                                "%s(%s) : IOC4 Dma STOP bit is still 1\n",
457                                __FUNCTION__, drive->name);
458         }
459
460         ioc4_dma = readl((void __iomem *)ioc4_dma_addr);
461         if (ioc4_dma & IOC4_S_DMA_ERROR) {
462                 printk(KERN_WARNING
463                        "%s(%s) : Warning!! - DMA Error during Previous"
464                        " transfer | status 0x%x\n",
465                        __FUNCTION__, drive->name, ioc4_dma);
466                 writel(IOC4_S_DMA_STOP, (void __iomem *)ioc4_dma_addr);
467                 ioc4_dma = sgiioc4_ide_dma_stop(hwif, dma_base);
468
469                 if (ioc4_dma & IOC4_S_DMA_STOP)
470                         printk(KERN_ERR
471                                "%s(%s) : IOC4 DMA STOP bit is still 1\n",
472                                __FUNCTION__, drive->name);
473         }
474
475         /* Address of the Scatter Gather List */
476         dma_addr = cpu_to_le32(hwif->dmatable_dma);
477         writel(dma_addr, (void __iomem *)(dma_base + IOC4_DMA_PTR_L * 4));
478
479         /* Address of the Ending DMA */
480         memset(ide_get_hwifdata(hwif), 0, IOC4_IDE_CACHELINE_SIZE);
481         ending_dma_addr = cpu_to_le32(hwif->dma_status);
482         writel(ending_dma_addr, (void __iomem *)(dma_base + IOC4_DMA_END_ADDR * 4));
483
484         writel(dma_direction, (void __iomem *)ioc4_dma_addr);
485         drive->waiting_for_dma = 1;
486 }
487
488 /* IOC4 Scatter Gather list Format                                       */
489 /* 128 Bit entries to support 64 bit addresses in the future             */
490 /* The Scatter Gather list Entry should be in the BIG-ENDIAN Format      */
491 /* --------------------------------------------------------------------- */
492 /* | Upper 32 bits - Zero           |           Lower 32 bits- address | */
493 /* --------------------------------------------------------------------- */
494 /* | Upper 32 bits - Zero           |EOL| 15 unused     | 16 Bit Length| */
495 /* --------------------------------------------------------------------- */
496 /* Creates the scatter gather list, DMA Table */
497 static unsigned int
498 sgiioc4_build_dma_table(ide_drive_t * drive, struct request *rq, int ddir)
499 {
500         ide_hwif_t *hwif = HWIF(drive);
501         unsigned int *table = hwif->dmatable_cpu;
502         unsigned int count = 0, i = 1;
503         struct scatterlist *sg;
504
505         hwif->sg_nents = i = ide_build_sglist(drive, rq);
506
507         if (!i)
508                 return 0;       /* sglist of length Zero */
509
510         sg = hwif->sg_table;
511         while (i && sg_dma_len(sg)) {
512                 dma_addr_t cur_addr;
513                 int cur_len;
514                 cur_addr = sg_dma_address(sg);
515                 cur_len = sg_dma_len(sg);
516
517                 while (cur_len) {
518                         if (count++ >= IOC4_PRD_ENTRIES) {
519                                 printk(KERN_WARNING
520                                        "%s: DMA table too small\n",
521                                        drive->name);
522                                 goto use_pio_instead;
523                         } else {
524                                 u32 bcount =
525                                     0x10000 - (cur_addr & 0xffff);
526
527                                 if (bcount > cur_len)
528                                         bcount = cur_len;
529
530                                 /* put the addr, length in
531                                  * the IOC4 dma-table format */
532                                 *table = 0x0;
533                                 table++;
534                                 *table = cpu_to_be32(cur_addr);
535                                 table++;
536                                 *table = 0x0;
537                                 table++;
538
539                                 *table = cpu_to_be32(bcount);
540                                 table++;
541
542                                 cur_addr += bcount;
543                                 cur_len -= bcount;
544                         }
545                 }
546
547                 sg++;
548                 i--;
549         }
550
551         if (count) {
552                 table--;
553                 *table |= cpu_to_be32(0x80000000);
554                 return count;
555         }
556
557 use_pio_instead:
558         pci_unmap_sg(hwif->pci_dev, hwif->sg_table, hwif->sg_nents,
559                      hwif->sg_dma_direction);
560
561         return 0;               /* revert to PIO for this request */
562 }
563
564 static int sgiioc4_ide_dma_setup(ide_drive_t *drive)
565 {
566         struct request *rq = HWGROUP(drive)->rq;
567         unsigned int count = 0;
568         int ddir;
569
570         if (rq_data_dir(rq))
571                 ddir = PCI_DMA_TODEVICE;
572         else
573                 ddir = PCI_DMA_FROMDEVICE;
574
575         if (!(count = sgiioc4_build_dma_table(drive, rq, ddir))) {
576                 /* try PIO instead of DMA */
577                 ide_map_sg(drive, rq);
578                 return 1;
579         }
580
581         if (rq_data_dir(rq))
582                 /* Writes TO the IOC4 FROM Main Memory */
583                 ddir = IOC4_DMA_READ;
584         else
585                 /* Writes FROM the IOC4 TO Main Memory */
586                 ddir = IOC4_DMA_WRITE;
587
588         sgiioc4_configure_for_dma(ddir, drive);
589
590         return 0;
591 }
592
593 static void __devinit
594 ide_init_sgiioc4(ide_hwif_t * hwif)
595 {
596         hwif->mmio = 2;
597         hwif->autodma = 1;
598         hwif->atapi_dma = 1;
599         hwif->ultra_mask = 0x0; /* Disable Ultra DMA */
600         hwif->mwdma_mask = 0x2; /* Multimode-2 DMA  */
601         hwif->swdma_mask = 0x2;
602         hwif->tuneproc = NULL;  /* Sets timing for PIO mode */
603         hwif->speedproc = NULL; /* Sets timing for DMA &/or PIO modes */
604         hwif->selectproc = NULL;/* Use the default routine to select drive */
605         hwif->reset_poll = NULL;/* No HBA specific reset_poll needed */
606         hwif->pre_reset = NULL; /* No HBA specific pre_set needed */
607         hwif->resetproc = &sgiioc4_resetproc;/* Reset DMA engine,
608                                                 clear interrupts */
609         hwif->intrproc = NULL;  /* Enable or Disable interrupt from drive */
610         hwif->maskproc = &sgiioc4_maskproc;     /* Mask on/off NIEN register */
611         hwif->quirkproc = NULL;
612         hwif->busproc = NULL;
613
614         hwif->dma_setup = &sgiioc4_ide_dma_setup;
615         hwif->dma_start = &sgiioc4_ide_dma_start;
616         hwif->ide_dma_end = &sgiioc4_ide_dma_end;
617         hwif->ide_dma_check = &sgiioc4_ide_dma_check;
618         hwif->ide_dma_on = &sgiioc4_ide_dma_on;
619         hwif->ide_dma_off_quietly = &sgiioc4_ide_dma_off_quietly;
620         hwif->ide_dma_test_irq = &sgiioc4_ide_dma_test_irq;
621         hwif->ide_dma_host_on = &sgiioc4_ide_dma_host_on;
622         hwif->ide_dma_host_off = &sgiioc4_ide_dma_host_off;
623         hwif->ide_dma_lostirq = &sgiioc4_ide_dma_lostirq;
624         hwif->ide_dma_timeout = &__ide_dma_timeout;
625
626         hwif->INB = &sgiioc4_INB;
627 }
628
629 static int __devinit
630 sgiioc4_ide_setup_pci_device(struct pci_dev *dev, ide_pci_device_t * d)
631 {
632         unsigned long cmd_base, dma_base, irqport;
633         unsigned long bar0, cmd_phys_base, ctl;
634         void __iomem *virt_base;
635         ide_hwif_t *hwif;
636         int h;
637
638         /*
639          * Find an empty HWIF; if none available, return -ENOMEM.
640          */
641         for (h = 0; h < MAX_HWIFS; ++h) {
642                 hwif = &ide_hwifs[h];
643                 if (hwif->chipset == ide_unknown)
644                         break;
645         }
646         if (h == MAX_HWIFS) {
647                 printk(KERN_ERR "%s: too many IDE interfaces, no room in table\n", d->name);
648                 return -ENOMEM;
649         }
650
651         /*  Get the CmdBlk and CtrlBlk Base Registers */
652         bar0 = pci_resource_start(dev, 0);
653         virt_base = ioremap(bar0, pci_resource_len(dev, 0));
654         if (virt_base == NULL) {
655                 printk(KERN_ERR "%s: Unable to remap BAR 0 address: 0x%lx\n",
656                         d->name, bar0);
657                 return -ENOMEM;
658         }
659         cmd_base = (unsigned long) virt_base + IOC4_CMD_OFFSET;
660         ctl = (unsigned long) virt_base + IOC4_CTRL_OFFSET;
661         irqport = (unsigned long) virt_base + IOC4_INTR_OFFSET;
662         dma_base = pci_resource_start(dev, 0) + IOC4_DMA_OFFSET;
663
664         cmd_phys_base = bar0 + IOC4_CMD_OFFSET;
665         if (!request_mem_region(cmd_phys_base, IOC4_CMD_CTL_BLK_SIZE,
666             hwif->name)) {
667                 printk(KERN_ERR
668                         "%s : %s -- ERROR, Addresses "
669                         "0x%p to 0x%p ALREADY in use\n",
670                        __FUNCTION__, hwif->name, (void *) cmd_phys_base,
671                        (void *) cmd_phys_base + IOC4_CMD_CTL_BLK_SIZE);
672                 return -ENOMEM;
673         }
674
675         if (hwif->io_ports[IDE_DATA_OFFSET] != cmd_base) {
676                 /* Initialize the IO registers */
677                 sgiioc4_init_hwif_ports(&hwif->hw, cmd_base, ctl, irqport);
678                 memcpy(hwif->io_ports, hwif->hw.io_ports,
679                        sizeof (hwif->io_ports));
680                 hwif->noprobe = !hwif->io_ports[IDE_DATA_OFFSET];
681         }
682
683         hwif->irq = dev->irq;
684         hwif->chipset = ide_pci;
685         hwif->pci_dev = dev;
686         hwif->channel = 0;      /* Single Channel chip */
687         hwif->cds = (struct ide_pci_device_s *) d;
688         hwif->gendev.parent = &dev->dev;/* setup proper ancestral information */
689
690         /* The IOC4 uses MMIO rather than Port IO. */
691         default_hwif_mmiops(hwif);
692
693         /* Initializing chipset IRQ Registers */
694         writel(0x03, (void __iomem *)(irqport + IOC4_INTR_SET * 4));
695
696         ide_init_sgiioc4(hwif);
697
698         if (dma_base)
699                 ide_dma_sgiioc4(hwif, dma_base);
700         else
701                 printk(KERN_INFO "%s: %s Bus-Master DMA disabled\n",
702                        hwif->name, d->name);
703
704         if (probe_hwif_init(hwif))
705                 return -EIO;
706
707         /* Create /proc/ide entries */
708         create_proc_ide_interfaces();
709
710         return 0;
711 }
712
713 static unsigned int __devinit
714 pci_init_sgiioc4(struct pci_dev *dev, ide_pci_device_t * d)
715 {
716         unsigned int class_rev;
717         int ret;
718
719         pci_read_config_dword(dev, PCI_CLASS_REVISION, &class_rev);
720         class_rev &= 0xff;
721         printk(KERN_INFO "%s: IDE controller at PCI slot %s, revision %d\n",
722                         d->name, pci_name(dev), class_rev);
723         if (class_rev < IOC4_SUPPORTED_FIRMWARE_REV) {
724                 printk(KERN_ERR "Skipping %s IDE controller in slot %s: "
725                         "firmware is obsolete - please upgrade to revision"
726                         "46 or higher\n", d->name, pci_name(dev));
727                 ret = -EAGAIN;
728                 goto out;
729         }
730         ret = sgiioc4_ide_setup_pci_device(dev, d);
731 out:
732         return ret;
733 }
734
735 static ide_pci_device_t sgiioc4_chipset __devinitdata = {
736          /* Channel 0 */
737          .name = "SGIIOC4",
738          .init_hwif = ide_init_sgiioc4,
739          .init_dma = ide_dma_sgiioc4,
740          .channels = 1,
741          .autodma = AUTODMA,
742          /* SGI IOC4 doesn't have enablebits. */
743          .bootable = ON_BOARD,
744 };
745
746 int
747 ioc4_ide_attach_one(struct ioc4_driver_data *idd)
748 {
749         /* PCI-RT does not bring out IDE connection.
750          * Do not attach to this particular IOC4.
751          */
752         if (idd->idd_variant == IOC4_VARIANT_PCI_RT)
753                 return 0;
754
755         return pci_init_sgiioc4(idd->idd_pdev, &sgiioc4_chipset);
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 __init ioc4_ide_init(void)
766 {
767         return ioc4_register_submodule(&ioc4_ide_submodule);
768 }
769
770 late_initcall(ioc4_ide_init); /* Call only after IDE init is done */
771
772 MODULE_AUTHOR("Aniket Malatpure/Jeremy Higdon");
773 MODULE_DESCRIPTION("IDE PCI driver module for SGI IOC4 Base-IO Card");
774 MODULE_LICENSE("GPL");