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Linus Torvalds1da177e2005-04-16 15:20:36 -07001/*
Bartlomiej Zolnierkiewicz3f019ee2007-10-16 22:29:54 +02002 * linux/drivers/ide/pci/sc1200.c Version 0.97 Aug 3 2007
Linus Torvalds1da177e2005-04-16 15:20:36 -07003 *
4 * Copyright (C) 2000-2002 Mark Lord <mlord@pobox.com>
Bartlomiej Zolnierkiewicz5fd216b2007-05-16 00:51:43 +02005 * Copyright (C) 2007 Bartlomiej Zolnierkiewicz
6 *
Linus Torvalds1da177e2005-04-16 15:20:36 -07007 * May be copied or modified under the terms of the GNU General Public License
8 *
9 * Development of this chipset driver was funded
10 * by the nice folks at National Semiconductor.
11 *
12 * Documentation:
13 * Available from National Semiconductor
14 */
15
Linus Torvalds1da177e2005-04-16 15:20:36 -070016#include <linux/module.h>
17#include <linux/types.h>
18#include <linux/kernel.h>
19#include <linux/delay.h>
20#include <linux/timer.h>
21#include <linux/mm.h>
22#include <linux/ioport.h>
23#include <linux/blkdev.h>
24#include <linux/hdreg.h>
25#include <linux/interrupt.h>
26#include <linux/pci.h>
27#include <linux/init.h>
28#include <linux/ide.h>
29#include <linux/pm.h>
30#include <asm/io.h>
31#include <asm/irq.h>
32
33#define SC1200_REV_A 0x00
34#define SC1200_REV_B1 0x01
35#define SC1200_REV_B3 0x02
36#define SC1200_REV_C1 0x03
37#define SC1200_REV_D1 0x04
38
39#define PCI_CLK_33 0x00
40#define PCI_CLK_48 0x01
41#define PCI_CLK_66 0x02
42#define PCI_CLK_33A 0x03
43
44static unsigned short sc1200_get_pci_clock (void)
45{
46 unsigned char chip_id, silicon_revision;
47 unsigned int pci_clock;
48 /*
49 * Check the silicon revision, as not all versions of the chip
50 * have the register with the fast PCI bus timings.
51 */
52 chip_id = inb (0x903c);
53 silicon_revision = inb (0x903d);
54
55 // Read the fast pci clock frequency
56 if (chip_id == 0x04 && silicon_revision < SC1200_REV_B1) {
57 pci_clock = PCI_CLK_33;
58 } else {
59 // check clock generator configuration (cfcc)
60 // the clock is in bits 8 and 9 of this word
61
62 pci_clock = inw (0x901e);
63 pci_clock >>= 8;
64 pci_clock &= 0x03;
65 if (pci_clock == PCI_CLK_33A)
66 pci_clock = PCI_CLK_33;
67 }
68 return pci_clock;
69}
70
Linus Torvalds1da177e2005-04-16 15:20:36 -070071/*
72 * Here are the standard PIO mode 0-4 timings for each "format".
73 * Format-0 uses fast data reg timings, with slower command reg timings.
74 * Format-1 uses fast timings for all registers, but won't work with all drives.
75 */
76static const unsigned int sc1200_pio_timings[4][5] =
77 {{0x00009172, 0x00012171, 0x00020080, 0x00032010, 0x00040010}, // format0 33Mhz
78 {0xd1329172, 0x71212171, 0x30200080, 0x20102010, 0x00100010}, // format1, 33Mhz
79 {0xfaa3f4f3, 0xc23232b2, 0x513101c1, 0x31213121, 0x10211021}, // format1, 48Mhz
80 {0xfff4fff4, 0xf35353d3, 0x814102f1, 0x42314231, 0x11311131}}; // format1, 66Mhz
81
82/*
83 * After chip reset, the PIO timings are set to 0x00009172, which is not valid.
84 */
85//#define SC1200_BAD_PIO(timings) (((timings)&~0x80000000)==0x00009172)
86
Bartlomiej Zolnierkiewicz3c3f5d22007-05-16 00:51:44 +020087static void sc1200_tunepio(ide_drive_t *drive, u8 pio)
88{
89 ide_hwif_t *hwif = drive->hwif;
90 struct pci_dev *pdev = hwif->pci_dev;
91 unsigned int basereg = hwif->channel ? 0x50 : 0x40, format = 0;
92
93 pci_read_config_dword(pdev, basereg + 4, &format);
94 format = (format >> 31) & 1;
95 if (format)
96 format += sc1200_get_pci_clock();
97 pci_write_config_dword(pdev, basereg + ((drive->dn & 1) << 3),
98 sc1200_pio_timings[format][pio]);
99}
100
Bartlomiej Zolnierkiewicz5fd216b2007-05-16 00:51:43 +0200101/*
102 * The SC1200 specifies that two drives sharing a cable cannot mix
103 * UDMA/MDMA. It has to be one or the other, for the pair, though
104 * different timings can still be chosen for each drive. We could
105 * set the appropriate timing bits on the fly, but that might be
106 * a bit confusing. So, for now we statically handle this requirement
107 * by looking at our mate drive to see what it is capable of, before
108 * choosing a mode for our own drive.
109 */
110static u8 sc1200_udma_filter(ide_drive_t *drive)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700111{
Bartlomiej Zolnierkiewicz5fd216b2007-05-16 00:51:43 +0200112 ide_hwif_t *hwif = drive->hwif;
113 ide_drive_t *mate = &hwif->drives[(drive->dn & 1) ^ 1];
114 struct hd_driveid *mateid = mate->id;
115 u8 mask = hwif->ultra_mask;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700116
Bartlomiej Zolnierkiewicz5fd216b2007-05-16 00:51:43 +0200117 if (mate->present == 0)
118 goto out;
119
120 if ((mateid->capability & 1) && __ide_dma_bad_drive(mate) == 0) {
121 if ((mateid->field_valid & 4) && (mateid->dma_ultra & 7))
122 goto out;
123 if ((mateid->field_valid & 2) && (mateid->dma_mword & 7))
124 mask = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700125 }
Bartlomiej Zolnierkiewicz5fd216b2007-05-16 00:51:43 +0200126out:
127 return mask;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700128}
129
Bartlomiej Zolnierkiewicz88b2b322007-10-13 17:47:51 +0200130static void sc1200_set_dma_mode(ide_drive_t *drive, const u8 mode)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700131{
132 ide_hwif_t *hwif = HWIF(drive);
133 int unit = drive->select.b.unit;
134 unsigned int reg, timings;
135 unsigned short pci_clock;
136 unsigned int basereg = hwif->channel ? 0x50 : 0x40;
137
Bartlomiej Zolnierkiewicz4eed5042008-01-25 22:17:18 +0100138 static const u32 udma_timing[3][3] = {
139 { 0x00921250, 0x00911140, 0x00911030 },
140 { 0x00932470, 0x00922260, 0x00922140 },
141 { 0x009436a1, 0x00933481, 0x00923261 },
142 };
143
144 static const u32 mwdma_timing[3][3] = {
145 { 0x00077771, 0x00012121, 0x00002020 },
146 { 0x000bbbb2, 0x00024241, 0x00013131 },
147 { 0x000ffff3, 0x00035352, 0x00015151 },
148 };
149
Linus Torvalds1da177e2005-04-16 15:20:36 -0700150 pci_clock = sc1200_get_pci_clock();
151
152 /*
Linus Torvalds1da177e2005-04-16 15:20:36 -0700153 * Note that each DMA mode has several timings associated with it.
154 * The correct timing depends on the fast PCI clock freq.
155 */
Bartlomiej Zolnierkiewicz4eed5042008-01-25 22:17:18 +0100156
157 if (mode >= XFER_UDMA_0)
158 timings = udma_timing[pci_clock][mode - XFER_UDMA_0];
159 else
160 timings = mwdma_timing[pci_clock][mode - XFER_MW_DMA_0];
Linus Torvalds1da177e2005-04-16 15:20:36 -0700161
162 if (unit == 0) { /* are we configuring drive0? */
163 pci_read_config_dword(hwif->pci_dev, basereg+4, &reg);
164 timings |= reg & 0x80000000; /* preserve PIO format bit */
165 pci_write_config_dword(hwif->pci_dev, basereg+4, timings);
166 } else {
167 pci_write_config_dword(hwif->pci_dev, basereg+12, timings);
168 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700169}
170
Linus Torvalds1da177e2005-04-16 15:20:36 -0700171/* Replacement for the standard ide_dma_end action in
172 * dma_proc.
173 *
174 * returns 1 on error, 0 otherwise
175 */
176static int sc1200_ide_dma_end (ide_drive_t *drive)
177{
178 ide_hwif_t *hwif = HWIF(drive);
179 unsigned long dma_base = hwif->dma_base;
180 byte dma_stat;
181
182 dma_stat = inb(dma_base+2); /* get DMA status */
183
184 if (!(dma_stat & 4))
185 printk(" ide_dma_end dma_stat=%0x err=%x newerr=%x\n",
186 dma_stat, ((dma_stat&7)!=4), ((dma_stat&2)==2));
187
188 outb(dma_stat|0x1b, dma_base+2); /* clear the INTR & ERROR bits */
189 outb(inb(dma_base)&~1, dma_base); /* !! DO THIS HERE !! stop DMA */
190
191 drive->waiting_for_dma = 0;
192 ide_destroy_dmatable(drive); /* purge DMA mappings */
193
194 return (dma_stat & 7) != 4; /* verify good DMA status */
195}
196
197/*
Bartlomiej Zolnierkiewicz26bcb872007-10-11 23:54:00 +0200198 * sc1200_set_pio_mode() handles setting of PIO modes
Linus Torvalds1da177e2005-04-16 15:20:36 -0700199 * for both the chipset and drive.
200 *
201 * All existing BIOSs for this chipset guarantee that all drives
202 * will have valid default PIO timings set up before we get here.
203 */
Bartlomiej Zolnierkiewicz26bcb872007-10-11 23:54:00 +0200204
205static void sc1200_set_pio_mode(ide_drive_t *drive, const u8 pio)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700206{
207 ide_hwif_t *hwif = HWIF(drive);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700208 int mode = -1;
209
Bartlomiej Zolnierkiewicza01ba402007-05-16 00:51:44 +0200210 /*
Bartlomiej Zolnierkiewicz26bcb872007-10-11 23:54:00 +0200211 * bad abuse of ->set_pio_mode interface
Bartlomiej Zolnierkiewicza01ba402007-05-16 00:51:44 +0200212 */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700213 switch (pio) {
214 case 200: mode = XFER_UDMA_0; break;
215 case 201: mode = XFER_UDMA_1; break;
216 case 202: mode = XFER_UDMA_2; break;
217 case 100: mode = XFER_MW_DMA_0; break;
218 case 101: mode = XFER_MW_DMA_1; break;
219 case 102: mode = XFER_MW_DMA_2; break;
220 }
221 if (mode != -1) {
222 printk("SC1200: %s: changing (U)DMA mode\n", drive->name);
Bartlomiej Zolnierkiewicz4a546e02008-01-26 20:13:01 +0100223 ide_dma_off_quietly(drive);
Bartlomiej Zolnierkiewiczf37aaf92008-01-26 20:13:02 +0100224 if (ide_set_dma_mode(drive, mode) == 0 && drive->using_dma)
Bartlomiej Zolnierkiewicz15ce9262008-01-26 20:13:03 +0100225 hwif->dma_host_set(drive, 1);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700226 return;
227 }
228
Bartlomiej Zolnierkiewicz88b2b322007-10-13 17:47:51 +0200229 sc1200_tunepio(drive, pio);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700230}
231
Alexey Dobriyanb86cc292006-10-03 01:14:32 -0700232#ifdef CONFIG_PM
Bartlomiej Zolnierkiewicz7c0e2662008-01-25 22:17:14 +0100233struct sc1200_saved_state {
234 u32 regs[8];
235};
Linus Torvalds1da177e2005-04-16 15:20:36 -0700236
Pavel Machek3bfffd92005-04-16 15:25:37 -0700237static int sc1200_suspend (struct pci_dev *dev, pm_message_t state)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700238{
Pavel Machekca078ba2005-09-03 15:56:57 -0700239 printk("SC1200: suspend(%u)\n", state.event);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700240
Bartlomiej Zolnierkiewicz7c0e2662008-01-25 22:17:14 +0100241 /*
242 * we only save state when going from full power to less
243 */
Pavel Machekca078ba2005-09-03 15:56:57 -0700244 if (state.event == PM_EVENT_ON) {
Bartlomiej Zolnierkiewicz7c0e2662008-01-25 22:17:14 +0100245 struct sc1200_saved_state *ss;
246 unsigned int r;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700247
Bartlomiej Zolnierkiewicz7c0e2662008-01-25 22:17:14 +0100248 /*
249 * allocate a permanent save area, if not already allocated
250 */
251 ss = (struct sc1200_saved_state *)pci_get_drvdata(dev);
252 if (ss == NULL) {
253 ss = kmalloc(sizeof(*ss), GFP_KERNEL);
254 if (ss == NULL)
255 return -ENOMEM;
256 pci_set_drvdata(dev, ss);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700257 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700258
Bartlomiej Zolnierkiewicz7c0e2662008-01-25 22:17:14 +0100259 /*
260 * save timing registers
261 * (this may be unnecessary if BIOS also does it)
262 */
263 for (r = 0; r < 8; r++)
264 pci_read_config_dword(dev, 0x40 + r * 4, &ss->regs[r]);
265 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700266
267 pci_disable_device(dev);
Pavel Machekca078ba2005-09-03 15:56:57 -0700268 pci_set_power_state(dev, pci_choose_state(dev, state));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700269 return 0;
270}
271
272static int sc1200_resume (struct pci_dev *dev)
273{
Bartlomiej Zolnierkiewicz7c0e2662008-01-25 22:17:14 +0100274 struct sc1200_saved_state *ss;
275 unsigned int r;
276 int i;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700277
Jeff Garzik9d434812007-10-26 20:31:15 +0200278 i = pci_enable_device(dev);
279 if (i)
280 return i;
281
Bartlomiej Zolnierkiewicz7c0e2662008-01-25 22:17:14 +0100282 ss = (struct sc1200_saved_state *)pci_get_drvdata(dev);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700283
Bartlomiej Zolnierkiewicz7c0e2662008-01-25 22:17:14 +0100284 /*
285 * restore timing registers
286 * (this may be unnecessary if BIOS also does it)
287 */
288 if (ss) {
289 for (r = 0; r < 8; r++)
290 pci_write_config_dword(dev, 0x40 + r * 4, ss->regs[r]);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700291 }
Bartlomiej Zolnierkiewicz7c0e2662008-01-25 22:17:14 +0100292
Linus Torvalds1da177e2005-04-16 15:20:36 -0700293 return 0;
294}
Alexey Dobriyanb86cc292006-10-03 01:14:32 -0700295#endif
Linus Torvalds1da177e2005-04-16 15:20:36 -0700296
297/*
298 * This gets invoked by the IDE driver once for each channel,
299 * and performs channel-specific pre-initialization before drive probing.
300 */
Herbert Xu6a6e1b12005-07-03 16:35:07 +0200301static void __devinit init_hwif_sc1200 (ide_hwif_t *hwif)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700302{
Bartlomiej Zolnierkiewicz88ae4d82007-10-13 17:47:53 +0200303 hwif->set_pio_mode = &sc1200_set_pio_mode;
304 hwif->set_dma_mode = &sc1200_set_dma_mode;
305
306 if (hwif->dma_base == 0)
307 return;
308
309 hwif->udma_filter = sc1200_udma_filter;
Bartlomiej Zolnierkiewicz88ae4d82007-10-13 17:47:53 +0200310 hwif->ide_dma_end = &sc1200_ide_dma_end;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700311}
312
Bartlomiej Zolnierkiewicz85620432007-10-20 00:32:34 +0200313static const struct ide_port_info sc1200_chipset __devinitdata = {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700314 .name = "SC1200",
315 .init_hwif = init_hwif_sc1200,
Bartlomiej Zolnierkiewicz1c513612007-10-19 00:30:10 +0200316 .host_flags = IDE_HFLAG_SERIALIZE |
317 IDE_HFLAG_POST_SET_MODE |
318 IDE_HFLAG_ABUSE_DMA_MODES |
Bartlomiej Zolnierkiewicz7cab14a2007-10-19 00:30:06 +0200319 IDE_HFLAG_BOOTABLE,
Bartlomiej Zolnierkiewicz4099d142007-07-20 01:11:59 +0200320 .pio_mask = ATA_PIO4,
Bartlomiej Zolnierkiewicz5f8b6c32007-10-19 00:30:07 +0200321 .mwdma_mask = ATA_MWDMA2,
322 .udma_mask = ATA_UDMA2,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700323};
324
325static int __devinit sc1200_init_one(struct pci_dev *dev, const struct pci_device_id *id)
326{
327 return ide_setup_pci_device(dev, &sc1200_chipset);
328}
329
Bartlomiej Zolnierkiewicz9cbcc5e2007-10-16 22:29:56 +0200330static const struct pci_device_id sc1200_pci_tbl[] = {
331 { PCI_VDEVICE(NS, PCI_DEVICE_ID_NS_SCx200_IDE), 0},
Linus Torvalds1da177e2005-04-16 15:20:36 -0700332 { 0, },
333};
334MODULE_DEVICE_TABLE(pci, sc1200_pci_tbl);
335
336static struct pci_driver driver = {
337 .name = "SC1200_IDE",
338 .id_table = sc1200_pci_tbl,
339 .probe = sc1200_init_one,
Alexey Dobriyanb86cc292006-10-03 01:14:32 -0700340#ifdef CONFIG_PM
Linus Torvalds1da177e2005-04-16 15:20:36 -0700341 .suspend = sc1200_suspend,
342 .resume = sc1200_resume,
Alexey Dobriyanb86cc292006-10-03 01:14:32 -0700343#endif
Linus Torvalds1da177e2005-04-16 15:20:36 -0700344};
345
Bartlomiej Zolnierkiewicz82ab1ee2007-01-27 13:46:56 +0100346static int __init sc1200_ide_init(void)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700347{
348 return ide_pci_register_driver(&driver);
349}
350
351module_init(sc1200_ide_init);
352
353MODULE_AUTHOR("Mark Lord");
354MODULE_DESCRIPTION("PCI driver module for NS SC1200 IDE");
355MODULE_LICENSE("GPL");