2 * linux/drivers/ide/pci/sc1200.c Version 0.91 28-Jan-2003
4 * Copyright (C) 2000-2002 Mark Lord <mlord@pobox.com>
5 * May be copied or modified under the terms of the GNU General Public License
7 * Development of this chipset driver was funded
8 * by the nice folks at National Semiconductor.
11 * Available from National Semiconductor
14 #include <linux/module.h>
15 #include <linux/types.h>
16 #include <linux/kernel.h>
17 #include <linux/delay.h>
18 #include <linux/timer.h>
20 #include <linux/ioport.h>
21 #include <linux/blkdev.h>
22 #include <linux/hdreg.h>
23 #include <linux/interrupt.h>
24 #include <linux/pci.h>
25 #include <linux/init.h>
26 #include <linux/ide.h>
31 #define SC1200_REV_A 0x00
32 #define SC1200_REV_B1 0x01
33 #define SC1200_REV_B3 0x02
34 #define SC1200_REV_C1 0x03
35 #define SC1200_REV_D1 0x04
37 #define PCI_CLK_33 0x00
38 #define PCI_CLK_48 0x01
39 #define PCI_CLK_66 0x02
40 #define PCI_CLK_33A 0x03
42 static unsigned short sc1200_get_pci_clock (void)
44 unsigned char chip_id, silicon_revision;
45 unsigned int pci_clock;
47 * Check the silicon revision, as not all versions of the chip
48 * have the register with the fast PCI bus timings.
50 chip_id = inb (0x903c);
51 silicon_revision = inb (0x903d);
53 // Read the fast pci clock frequency
54 if (chip_id == 0x04 && silicon_revision < SC1200_REV_B1) {
55 pci_clock = PCI_CLK_33;
57 // check clock generator configuration (cfcc)
58 // the clock is in bits 8 and 9 of this word
60 pci_clock = inw (0x901e);
63 if (pci_clock == PCI_CLK_33A)
64 pci_clock = PCI_CLK_33;
69 extern char *ide_xfer_verbose (byte xfer_rate);
72 * Set a new transfer mode at the drive
74 static int sc1200_set_xfer_mode (ide_drive_t *drive, byte mode)
76 printk("%s: sc1200_set_xfer_mode(%s)\n", drive->name, ide_xfer_verbose(mode));
77 return ide_config_drive_speed(drive, mode);
81 * Here are the standard PIO mode 0-4 timings for each "format".
82 * Format-0 uses fast data reg timings, with slower command reg timings.
83 * Format-1 uses fast timings for all registers, but won't work with all drives.
85 static const unsigned int sc1200_pio_timings[4][5] =
86 {{0x00009172, 0x00012171, 0x00020080, 0x00032010, 0x00040010}, // format0 33Mhz
87 {0xd1329172, 0x71212171, 0x30200080, 0x20102010, 0x00100010}, // format1, 33Mhz
88 {0xfaa3f4f3, 0xc23232b2, 0x513101c1, 0x31213121, 0x10211021}, // format1, 48Mhz
89 {0xfff4fff4, 0xf35353d3, 0x814102f1, 0x42314231, 0x11311131}}; // format1, 66Mhz
92 * After chip reset, the PIO timings are set to 0x00009172, which is not valid.
94 //#define SC1200_BAD_PIO(timings) (((timings)&~0x80000000)==0x00009172)
96 static int sc1200_autoselect_dma_mode (ide_drive_t *drive)
98 int udma_ok = 1, mode = 0;
99 ide_hwif_t *hwif = HWIF(drive);
100 int unit = drive->select.b.unit;
101 ide_drive_t *mate = &hwif->drives[unit^1];
102 struct hd_driveid *id = drive->id;
105 * The SC1200 specifies that two drives sharing a cable cannot
106 * mix UDMA/MDMA. It has to be one or the other, for the pair,
107 * though different timings can still be chosen for each drive.
108 * We could set the appropriate timing bits on the fly,
109 * but that might be a bit confusing. So, for now we statically
110 * handle this requirement by looking at our mate drive to see
111 * what it is capable of, before choosing a mode for our own drive.
114 struct hd_driveid *mateid = mate->id;
115 if (mateid && (mateid->capability & 1) && !__ide_dma_bad_drive(mate)) {
116 if ((mateid->field_valid & 4) && (mateid->dma_ultra & 7))
118 else if ((mateid->field_valid & 2) && (mateid->dma_mword & 7))
125 * Now see what the current drive is capable of,
126 * selecting UDMA only if the mate said it was ok.
128 if (id && (id->capability & 1) && hwif->autodma && !__ide_dma_bad_drive(drive)) {
129 if (udma_ok && (id->field_valid & 4) && (id->dma_ultra & 7)) {
130 if (id->dma_ultra & 4)
132 else if (id->dma_ultra & 2)
134 else if (id->dma_ultra & 1)
137 if (!mode && (id->field_valid & 2) && (id->dma_mword & 7)) {
138 if (id->dma_mword & 4)
139 mode = XFER_MW_DMA_2;
140 else if (id->dma_mword & 2)
141 mode = XFER_MW_DMA_1;
142 else if (id->dma_mword & 1)
143 mode = XFER_MW_DMA_0;
150 * sc1200_config_dma2() handles selection/setting of DMA/UDMA modes
151 * for both the chipset and drive.
153 static int sc1200_config_dma2 (ide_drive_t *drive, int mode)
155 ide_hwif_t *hwif = HWIF(drive);
156 int unit = drive->select.b.unit;
157 unsigned int reg, timings;
158 unsigned short pci_clock;
159 unsigned int basereg = hwif->channel ? 0x50 : 0x40;
162 * Default to DMA-off in case we run into trouble here.
164 hwif->dma_off_quietly(drive); /* turn off DMA while we fiddle */
165 outb(inb(hwif->dma_base+2)&~(unit?0x40:0x20), hwif->dma_base+2); /* clear DMA_capable bit */
168 * Tell the drive to switch to the new mode; abort on failure.
170 if (!mode || sc1200_set_xfer_mode(drive, mode)) {
171 printk("SC1200: set xfer mode failure\n");
172 return 1; /* failure */
175 pci_clock = sc1200_get_pci_clock();
178 * Now tune the chipset to match the drive:
180 * Note that each DMA mode has several timings associated with it.
181 * The correct timing depends on the fast PCI clock freq.
187 case PCI_CLK_33: timings = 0x00921250; break;
188 case PCI_CLK_48: timings = 0x00932470; break;
189 case PCI_CLK_66: timings = 0x009436a1; break;
194 case PCI_CLK_33: timings = 0x00911140; break;
195 case PCI_CLK_48: timings = 0x00922260; break;
196 case PCI_CLK_66: timings = 0x00933481; break;
201 case PCI_CLK_33: timings = 0x00911030; break;
202 case PCI_CLK_48: timings = 0x00922140; break;
203 case PCI_CLK_66: timings = 0x00923261; break;
208 case PCI_CLK_33: timings = 0x00077771; break;
209 case PCI_CLK_48: timings = 0x000bbbb2; break;
210 case PCI_CLK_66: timings = 0x000ffff3; break;
215 case PCI_CLK_33: timings = 0x00012121; break;
216 case PCI_CLK_48: timings = 0x00024241; break;
217 case PCI_CLK_66: timings = 0x00035352; break;
222 case PCI_CLK_33: timings = 0x00002020; break;
223 case PCI_CLK_48: timings = 0x00013131; break;
224 case PCI_CLK_66: timings = 0x00015151; break;
230 printk("%s: sc1200_config_dma: huh? mode=%02x clk=%x \n", drive->name, mode, pci_clock);
231 return 1; /* failure */
234 if (unit == 0) { /* are we configuring drive0? */
235 pci_read_config_dword(hwif->pci_dev, basereg+4, ®);
236 timings |= reg & 0x80000000; /* preserve PIO format bit */
237 pci_write_config_dword(hwif->pci_dev, basereg+4, timings);
239 pci_write_config_dword(hwif->pci_dev, basereg+12, timings);
242 outb(inb(hwif->dma_base+2)|(unit?0x40:0x20), hwif->dma_base+2); /* set DMA_capable bit */
244 return 0; /* success */
248 * sc1200_config_dma() handles selection/setting of DMA/UDMA modes
249 * for both the chipset and drive.
251 static int sc1200_config_dma (ide_drive_t *drive)
253 return sc1200_config_dma2(drive, sc1200_autoselect_dma_mode(drive));
257 /* Replacement for the standard ide_dma_end action in
260 * returns 1 on error, 0 otherwise
262 static int sc1200_ide_dma_end (ide_drive_t *drive)
264 ide_hwif_t *hwif = HWIF(drive);
265 unsigned long dma_base = hwif->dma_base;
268 dma_stat = inb(dma_base+2); /* get DMA status */
271 printk(" ide_dma_end dma_stat=%0x err=%x newerr=%x\n",
272 dma_stat, ((dma_stat&7)!=4), ((dma_stat&2)==2));
274 outb(dma_stat|0x1b, dma_base+2); /* clear the INTR & ERROR bits */
275 outb(inb(dma_base)&~1, dma_base); /* !! DO THIS HERE !! stop DMA */
277 drive->waiting_for_dma = 0;
278 ide_destroy_dmatable(drive); /* purge DMA mappings */
280 return (dma_stat & 7) != 4; /* verify good DMA status */
284 * sc1200_tuneproc() handles selection/setting of PIO modes
285 * for both the chipset and drive.
287 * All existing BIOSs for this chipset guarantee that all drives
288 * will have valid default PIO timings set up before we get here.
290 static void sc1200_tuneproc (ide_drive_t *drive, byte pio) /* mode=255 means "autotune" */
292 ide_hwif_t *hwif = HWIF(drive);
294 static byte modes[5] = {XFER_PIO_0, XFER_PIO_1, XFER_PIO_2, XFER_PIO_3, XFER_PIO_4};
298 case 200: mode = XFER_UDMA_0; break;
299 case 201: mode = XFER_UDMA_1; break;
300 case 202: mode = XFER_UDMA_2; break;
301 case 100: mode = XFER_MW_DMA_0; break;
302 case 101: mode = XFER_MW_DMA_1; break;
303 case 102: mode = XFER_MW_DMA_2; break;
306 printk("SC1200: %s: changing (U)DMA mode\n", drive->name);
307 (void)sc1200_config_dma2(drive, mode);
311 pio = ide_get_best_pio_mode(drive, pio, 4, NULL);
312 printk("SC1200: %s: setting PIO mode%d\n", drive->name, pio);
313 if (!sc1200_set_xfer_mode(drive, modes[pio])) {
314 unsigned int basereg = hwif->channel ? 0x50 : 0x40;
315 pci_read_config_dword (hwif->pci_dev, basereg+4, &format);
316 format = (format >> 31) & 1;
318 format += sc1200_get_pci_clock();
319 pci_write_config_dword(hwif->pci_dev, basereg + (drive->select.b.unit << 3), sc1200_pio_timings[format][pio]);
324 static ide_hwif_t *lookup_pci_dev (ide_hwif_t *prev, struct pci_dev *dev)
328 for (h = 0; h < MAX_HWIFS; h++) {
329 ide_hwif_t *hwif = &ide_hwifs[h];
332 prev = NULL; // found previous, now look for next match
334 if (hwif && hwif->pci_dev == dev)
335 return hwif; // found next match
338 return NULL; // not found
341 typedef struct sc1200_saved_state_s {
343 } sc1200_saved_state_t;
346 static int sc1200_suspend (struct pci_dev *dev, pm_message_t state)
348 ide_hwif_t *hwif = NULL;
350 printk("SC1200: suspend(%u)\n", state.event);
352 if (state.event == PM_EVENT_ON) {
353 // we only save state when going from full power to less
356 // Loop over all interfaces that are part of this PCI device:
358 while ((hwif = lookup_pci_dev(hwif, dev)) != NULL) {
359 sc1200_saved_state_t *ss;
360 unsigned int basereg, r;
362 // allocate a permanent save area, if not already allocated
364 ss = (sc1200_saved_state_t *)hwif->config_data;
366 ss = kmalloc(sizeof(sc1200_saved_state_t), GFP_KERNEL);
369 hwif->config_data = (unsigned long)ss;
371 ss = (sc1200_saved_state_t *)hwif->config_data;
373 // Save timing registers: this may be unnecessary if
376 basereg = hwif->channel ? 0x50 : 0x40;
377 for (r = 0; r < 4; ++r) {
378 pci_read_config_dword (hwif->pci_dev, basereg + (r<<2), &ss->regs[r]);
383 /* You don't need to iterate over disks -- sysfs should have done that for you already */
385 pci_disable_device(dev);
386 pci_set_power_state(dev, pci_choose_state(dev, state));
387 dev->current_state = state.event;
391 static int sc1200_resume (struct pci_dev *dev)
393 ide_hwif_t *hwif = NULL;
395 pci_set_power_state(dev, PCI_D0); // bring chip back from sleep state
396 dev->current_state = PM_EVENT_ON;
397 pci_enable_device(dev);
399 // loop over all interfaces that are part of this pci device:
401 while ((hwif = lookup_pci_dev(hwif, dev)) != NULL) {
402 unsigned int basereg, r, d, format;
403 sc1200_saved_state_t *ss = (sc1200_saved_state_t *)hwif->config_data;
406 // Restore timing registers: this may be unnecessary if BIOS also does it
408 basereg = hwif->channel ? 0x50 : 0x40;
410 for (r = 0; r < 4; ++r) {
411 pci_write_config_dword(hwif->pci_dev, basereg + (r<<2), ss->regs[r]);
415 // Re-program drive PIO modes
417 pci_read_config_dword(hwif->pci_dev, basereg+4, &format);
418 format = (format >> 31) & 1;
420 format += sc1200_get_pci_clock();
421 for (d = 0; d < 2; ++d) {
422 ide_drive_t *drive = &(hwif->drives[d]);
423 if (drive->present) {
424 unsigned int pio, timings;
425 pci_read_config_dword(hwif->pci_dev, basereg+(drive->select.b.unit << 3), &timings);
426 for (pio = 0; pio <= 4; ++pio) {
427 if (sc1200_pio_timings[format][pio] == timings)
431 pio = 255; /* autotune */
432 (void)sc1200_tuneproc(drive, pio);
436 // Re-program drive DMA modes
438 for (d = 0; d < MAX_DRIVES; ++d) {
439 ide_drive_t *drive = &(hwif->drives[d]);
440 if (drive->present && !__ide_dma_bad_drive(drive)) {
441 int was_using_dma = drive->using_dma;
442 hwif->dma_off_quietly(drive);
443 sc1200_config_dma(drive);
444 if (!was_using_dma && drive->using_dma) {
445 hwif->dma_off_quietly(drive);
455 * This gets invoked by the IDE driver once for each channel,
456 * and performs channel-specific pre-initialization before drive probing.
458 static void __devinit init_hwif_sc1200 (ide_hwif_t *hwif)
461 hwif->serialized = hwif->mate->serialized = 1;
463 if (hwif->dma_base) {
464 hwif->ide_dma_check = &sc1200_config_dma;
465 hwif->ide_dma_end = &sc1200_ide_dma_end;
468 hwif->tuneproc = &sc1200_tuneproc;
471 hwif->ultra_mask = 0x07;
472 hwif->mwdma_mask = 0x07;
474 hwif->drives[0].autodma = hwif->autodma;
475 hwif->drives[1].autodma = hwif->autodma;
478 static ide_pci_device_t sc1200_chipset __devinitdata = {
480 .init_hwif = init_hwif_sc1200,
483 .bootable = ON_BOARD,
486 static int __devinit sc1200_init_one(struct pci_dev *dev, const struct pci_device_id *id)
488 return ide_setup_pci_device(dev, &sc1200_chipset);
491 static struct pci_device_id sc1200_pci_tbl[] = {
492 { PCI_DEVICE(PCI_VENDOR_ID_NS, PCI_DEVICE_ID_NS_SCx200_IDE), 0},
495 MODULE_DEVICE_TABLE(pci, sc1200_pci_tbl);
497 static struct pci_driver driver = {
498 .name = "SC1200_IDE",
499 .id_table = sc1200_pci_tbl,
500 .probe = sc1200_init_one,
502 .suspend = sc1200_suspend,
503 .resume = sc1200_resume,
507 static int __init sc1200_ide_init(void)
509 return ide_pci_register_driver(&driver);
512 module_init(sc1200_ide_init);
514 MODULE_AUTHOR("Mark Lord");
515 MODULE_DESCRIPTION("PCI driver module for NS SC1200 IDE");
516 MODULE_LICENSE("GPL");