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Linus Torvalds1da177e2005-04-16 15:20:36 -07001/*
Linus Torvalds1da177e2005-04-16 15:20:36 -07002 * Copyright (C) 2000-2002 Mark Lord <mlord@pobox.com>
Bartlomiej Zolnierkiewicz5fd216b2007-05-16 00:51:43 +02003 * Copyright (C) 2007 Bartlomiej Zolnierkiewicz
4 *
Linus Torvalds1da177e2005-04-16 15:20:36 -07005 * May be copied or modified under the terms of the GNU General Public License
6 *
7 * Development of this chipset driver was funded
8 * by the nice folks at National Semiconductor.
9 *
10 * Documentation:
11 * Available from National Semiconductor
12 */
13
Linus Torvalds1da177e2005-04-16 15:20:36 -070014#include <linux/module.h>
15#include <linux/types.h>
16#include <linux/kernel.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070017#include <linux/hdreg.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070018#include <linux/pci.h>
19#include <linux/init.h>
20#include <linux/ide.h>
21#include <linux/pm.h>
Bartlomiej Zolnierkiewicz78829dd2008-02-02 19:56:33 +010022
Linus Torvalds1da177e2005-04-16 15:20:36 -070023#include <asm/io.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070024
Bartlomiej Zolnierkiewiczced3ec82008-07-24 22:53:32 +020025#define DRV_NAME "sc1200"
26
Linus Torvalds1da177e2005-04-16 15:20:36 -070027#define SC1200_REV_A 0x00
28#define SC1200_REV_B1 0x01
29#define SC1200_REV_B3 0x02
30#define SC1200_REV_C1 0x03
31#define SC1200_REV_D1 0x04
32
33#define PCI_CLK_33 0x00
34#define PCI_CLK_48 0x01
35#define PCI_CLK_66 0x02
36#define PCI_CLK_33A 0x03
37
38static unsigned short sc1200_get_pci_clock (void)
39{
40 unsigned char chip_id, silicon_revision;
41 unsigned int pci_clock;
42 /*
43 * Check the silicon revision, as not all versions of the chip
44 * have the register with the fast PCI bus timings.
45 */
46 chip_id = inb (0x903c);
47 silicon_revision = inb (0x903d);
48
49 // Read the fast pci clock frequency
50 if (chip_id == 0x04 && silicon_revision < SC1200_REV_B1) {
51 pci_clock = PCI_CLK_33;
52 } else {
53 // check clock generator configuration (cfcc)
54 // the clock is in bits 8 and 9 of this word
55
56 pci_clock = inw (0x901e);
57 pci_clock >>= 8;
58 pci_clock &= 0x03;
59 if (pci_clock == PCI_CLK_33A)
60 pci_clock = PCI_CLK_33;
61 }
62 return pci_clock;
63}
64
Linus Torvalds1da177e2005-04-16 15:20:36 -070065/*
66 * Here are the standard PIO mode 0-4 timings for each "format".
67 * Format-0 uses fast data reg timings, with slower command reg timings.
68 * Format-1 uses fast timings for all registers, but won't work with all drives.
69 */
70static const unsigned int sc1200_pio_timings[4][5] =
71 {{0x00009172, 0x00012171, 0x00020080, 0x00032010, 0x00040010}, // format0 33Mhz
72 {0xd1329172, 0x71212171, 0x30200080, 0x20102010, 0x00100010}, // format1, 33Mhz
73 {0xfaa3f4f3, 0xc23232b2, 0x513101c1, 0x31213121, 0x10211021}, // format1, 48Mhz
74 {0xfff4fff4, 0xf35353d3, 0x814102f1, 0x42314231, 0x11311131}}; // format1, 66Mhz
75
76/*
77 * After chip reset, the PIO timings are set to 0x00009172, which is not valid.
78 */
79//#define SC1200_BAD_PIO(timings) (((timings)&~0x80000000)==0x00009172)
80
Bartlomiej Zolnierkiewicz3c3f5d22007-05-16 00:51:44 +020081static void sc1200_tunepio(ide_drive_t *drive, u8 pio)
82{
83 ide_hwif_t *hwif = drive->hwif;
Bartlomiej Zolnierkiewicz36501652008-02-01 23:09:31 +010084 struct pci_dev *pdev = to_pci_dev(hwif->dev);
Bartlomiej Zolnierkiewicz3c3f5d22007-05-16 00:51:44 +020085 unsigned int basereg = hwif->channel ? 0x50 : 0x40, format = 0;
86
87 pci_read_config_dword(pdev, basereg + 4, &format);
88 format = (format >> 31) & 1;
89 if (format)
90 format += sc1200_get_pci_clock();
91 pci_write_config_dword(pdev, basereg + ((drive->dn & 1) << 3),
92 sc1200_pio_timings[format][pio]);
93}
94
Bartlomiej Zolnierkiewicz5fd216b2007-05-16 00:51:43 +020095/*
96 * The SC1200 specifies that two drives sharing a cable cannot mix
97 * UDMA/MDMA. It has to be one or the other, for the pair, though
98 * different timings can still be chosen for each drive. We could
99 * set the appropriate timing bits on the fly, but that might be
100 * a bit confusing. So, for now we statically handle this requirement
101 * by looking at our mate drive to see what it is capable of, before
102 * choosing a mode for our own drive.
103 */
104static u8 sc1200_udma_filter(ide_drive_t *drive)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700105{
Bartlomiej Zolnierkiewicz5fd216b2007-05-16 00:51:43 +0200106 ide_hwif_t *hwif = drive->hwif;
107 ide_drive_t *mate = &hwif->drives[(drive->dn & 1) ^ 1];
108 struct hd_driveid *mateid = mate->id;
109 u8 mask = hwif->ultra_mask;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700110
Bartlomiej Zolnierkiewicz5fd216b2007-05-16 00:51:43 +0200111 if (mate->present == 0)
112 goto out;
113
114 if ((mateid->capability & 1) && __ide_dma_bad_drive(mate) == 0) {
115 if ((mateid->field_valid & 4) && (mateid->dma_ultra & 7))
116 goto out;
117 if ((mateid->field_valid & 2) && (mateid->dma_mword & 7))
118 mask = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700119 }
Bartlomiej Zolnierkiewicz5fd216b2007-05-16 00:51:43 +0200120out:
121 return mask;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700122}
123
Bartlomiej Zolnierkiewicz88b2b322007-10-13 17:47:51 +0200124static void sc1200_set_dma_mode(ide_drive_t *drive, const u8 mode)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700125{
126 ide_hwif_t *hwif = HWIF(drive);
Bartlomiej Zolnierkiewicz36501652008-02-01 23:09:31 +0100127 struct pci_dev *dev = to_pci_dev(hwif->dev);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700128 int unit = drive->select.b.unit;
129 unsigned int reg, timings;
130 unsigned short pci_clock;
131 unsigned int basereg = hwif->channel ? 0x50 : 0x40;
132
Bartlomiej Zolnierkiewicz4eed5042008-01-25 22:17:18 +0100133 static const u32 udma_timing[3][3] = {
134 { 0x00921250, 0x00911140, 0x00911030 },
135 { 0x00932470, 0x00922260, 0x00922140 },
136 { 0x009436a1, 0x00933481, 0x00923261 },
137 };
138
139 static const u32 mwdma_timing[3][3] = {
140 { 0x00077771, 0x00012121, 0x00002020 },
141 { 0x000bbbb2, 0x00024241, 0x00013131 },
142 { 0x000ffff3, 0x00035352, 0x00015151 },
143 };
144
Linus Torvalds1da177e2005-04-16 15:20:36 -0700145 pci_clock = sc1200_get_pci_clock();
146
147 /*
Linus Torvalds1da177e2005-04-16 15:20:36 -0700148 * Note that each DMA mode has several timings associated with it.
149 * The correct timing depends on the fast PCI clock freq.
150 */
Bartlomiej Zolnierkiewicz4eed5042008-01-25 22:17:18 +0100151
152 if (mode >= XFER_UDMA_0)
153 timings = udma_timing[pci_clock][mode - XFER_UDMA_0];
154 else
155 timings = mwdma_timing[pci_clock][mode - XFER_MW_DMA_0];
Linus Torvalds1da177e2005-04-16 15:20:36 -0700156
157 if (unit == 0) { /* are we configuring drive0? */
Bartlomiej Zolnierkiewicz36501652008-02-01 23:09:31 +0100158 pci_read_config_dword(dev, basereg + 4, &reg);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700159 timings |= reg & 0x80000000; /* preserve PIO format bit */
Bartlomiej Zolnierkiewicz36501652008-02-01 23:09:31 +0100160 pci_write_config_dword(dev, basereg + 4, timings);
161 } else
162 pci_write_config_dword(dev, basereg + 12, timings);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700163}
164
Linus Torvalds1da177e2005-04-16 15:20:36 -0700165/* Replacement for the standard ide_dma_end action in
166 * dma_proc.
167 *
168 * returns 1 on error, 0 otherwise
169 */
Bartlomiej Zolnierkiewicz5e37bdc2008-04-26 22:25:24 +0200170static int sc1200_dma_end(ide_drive_t *drive)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700171{
172 ide_hwif_t *hwif = HWIF(drive);
173 unsigned long dma_base = hwif->dma_base;
174 byte dma_stat;
175
176 dma_stat = inb(dma_base+2); /* get DMA status */
177
178 if (!(dma_stat & 4))
179 printk(" ide_dma_end dma_stat=%0x err=%x newerr=%x\n",
180 dma_stat, ((dma_stat&7)!=4), ((dma_stat&2)==2));
181
182 outb(dma_stat|0x1b, dma_base+2); /* clear the INTR & ERROR bits */
183 outb(inb(dma_base)&~1, dma_base); /* !! DO THIS HERE !! stop DMA */
184
185 drive->waiting_for_dma = 0;
186 ide_destroy_dmatable(drive); /* purge DMA mappings */
187
188 return (dma_stat & 7) != 4; /* verify good DMA status */
189}
190
191/*
Bartlomiej Zolnierkiewicz26bcb872007-10-11 23:54:00 +0200192 * sc1200_set_pio_mode() handles setting of PIO modes
Linus Torvalds1da177e2005-04-16 15:20:36 -0700193 * for both the chipset and drive.
194 *
195 * All existing BIOSs for this chipset guarantee that all drives
196 * will have valid default PIO timings set up before we get here.
197 */
Bartlomiej Zolnierkiewicz26bcb872007-10-11 23:54:00 +0200198
199static void sc1200_set_pio_mode(ide_drive_t *drive, const u8 pio)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700200{
201 ide_hwif_t *hwif = HWIF(drive);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700202 int mode = -1;
203
Bartlomiej Zolnierkiewicza01ba402007-05-16 00:51:44 +0200204 /*
Bartlomiej Zolnierkiewicz26bcb872007-10-11 23:54:00 +0200205 * bad abuse of ->set_pio_mode interface
Bartlomiej Zolnierkiewicza01ba402007-05-16 00:51:44 +0200206 */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700207 switch (pio) {
208 case 200: mode = XFER_UDMA_0; break;
209 case 201: mode = XFER_UDMA_1; break;
210 case 202: mode = XFER_UDMA_2; break;
211 case 100: mode = XFER_MW_DMA_0; break;
212 case 101: mode = XFER_MW_DMA_1; break;
213 case 102: mode = XFER_MW_DMA_2; break;
214 }
215 if (mode != -1) {
216 printk("SC1200: %s: changing (U)DMA mode\n", drive->name);
Bartlomiej Zolnierkiewicz4a546e02008-01-26 20:13:01 +0100217 ide_dma_off_quietly(drive);
Bartlomiej Zolnierkiewiczf37aaf92008-01-26 20:13:02 +0100218 if (ide_set_dma_mode(drive, mode) == 0 && drive->using_dma)
Bartlomiej Zolnierkiewicz5e37bdc2008-04-26 22:25:24 +0200219 hwif->dma_ops->dma_host_set(drive, 1);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700220 return;
221 }
222
Bartlomiej Zolnierkiewicz88b2b322007-10-13 17:47:51 +0200223 sc1200_tunepio(drive, pio);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700224}
225
Alexey Dobriyanb86cc292006-10-03 01:14:32 -0700226#ifdef CONFIG_PM
Bartlomiej Zolnierkiewicz7c0e2662008-01-25 22:17:14 +0100227struct sc1200_saved_state {
228 u32 regs[8];
229};
Linus Torvalds1da177e2005-04-16 15:20:36 -0700230
Pavel Machek3bfffd92005-04-16 15:25:37 -0700231static int sc1200_suspend (struct pci_dev *dev, pm_message_t state)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700232{
Pavel Machekca078ba2005-09-03 15:56:57 -0700233 printk("SC1200: suspend(%u)\n", state.event);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700234
Bartlomiej Zolnierkiewicz7c0e2662008-01-25 22:17:14 +0100235 /*
236 * we only save state when going from full power to less
237 */
Pavel Machekca078ba2005-09-03 15:56:57 -0700238 if (state.event == PM_EVENT_ON) {
Bartlomiej Zolnierkiewicz96776f32008-07-24 22:53:16 +0200239 struct ide_host *host = pci_get_drvdata(dev);
240 struct sc1200_saved_state *ss = host->host_priv;
Bartlomiej Zolnierkiewicz7c0e2662008-01-25 22:17:14 +0100241 unsigned int r;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700242
Bartlomiej Zolnierkiewicz7c0e2662008-01-25 22:17:14 +0100243 /*
Bartlomiej Zolnierkiewicz7c0e2662008-01-25 22:17:14 +0100244 * save timing registers
245 * (this may be unnecessary if BIOS also does it)
246 */
247 for (r = 0; r < 8; r++)
248 pci_read_config_dword(dev, 0x40 + r * 4, &ss->regs[r]);
249 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700250
251 pci_disable_device(dev);
Pavel Machekca078ba2005-09-03 15:56:57 -0700252 pci_set_power_state(dev, pci_choose_state(dev, state));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700253 return 0;
254}
255
256static int sc1200_resume (struct pci_dev *dev)
257{
Bartlomiej Zolnierkiewicz96776f32008-07-24 22:53:16 +0200258 struct ide_host *host = pci_get_drvdata(dev);
259 struct sc1200_saved_state *ss = host->host_priv;
Bartlomiej Zolnierkiewicz7c0e2662008-01-25 22:17:14 +0100260 unsigned int r;
261 int i;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700262
Jeff Garzik9d434812007-10-26 20:31:15 +0200263 i = pci_enable_device(dev);
264 if (i)
265 return i;
266
Bartlomiej Zolnierkiewicz7c0e2662008-01-25 22:17:14 +0100267 /*
268 * restore timing registers
269 * (this may be unnecessary if BIOS also does it)
270 */
Bartlomiej Zolnierkiewicz96776f32008-07-24 22:53:16 +0200271 for (r = 0; r < 8; r++)
272 pci_write_config_dword(dev, 0x40 + r * 4, ss->regs[r]);
Bartlomiej Zolnierkiewicz7c0e2662008-01-25 22:17:14 +0100273
Linus Torvalds1da177e2005-04-16 15:20:36 -0700274 return 0;
275}
Alexey Dobriyanb86cc292006-10-03 01:14:32 -0700276#endif
Linus Torvalds1da177e2005-04-16 15:20:36 -0700277
Bartlomiej Zolnierkiewiczac95bee2008-04-26 22:25:14 +0200278static const struct ide_port_ops sc1200_port_ops = {
279 .set_pio_mode = sc1200_set_pio_mode,
280 .set_dma_mode = sc1200_set_dma_mode,
281 .udma_filter = sc1200_udma_filter,
282};
283
Bartlomiej Zolnierkiewiczf37afda2008-04-26 22:25:24 +0200284static const struct ide_dma_ops sc1200_dma_ops = {
285 .dma_host_set = ide_dma_host_set,
286 .dma_setup = ide_dma_setup,
287 .dma_exec_cmd = ide_dma_exec_cmd,
288 .dma_start = ide_dma_start,
Bartlomiej Zolnierkiewicz5e37bdc2008-04-26 22:25:24 +0200289 .dma_end = sc1200_dma_end,
Bartlomiej Zolnierkiewiczf37afda2008-04-26 22:25:24 +0200290 .dma_test_irq = ide_dma_test_irq,
291 .dma_lost_irq = ide_dma_lost_irq,
292 .dma_timeout = ide_dma_timeout,
Bartlomiej Zolnierkiewicz5e37bdc2008-04-26 22:25:24 +0200293};
294
Bartlomiej Zolnierkiewicz85620432007-10-20 00:32:34 +0200295static const struct ide_port_info sc1200_chipset __devinitdata = {
Bartlomiej Zolnierkiewiczced3ec82008-07-24 22:53:32 +0200296 .name = DRV_NAME,
Bartlomiej Zolnierkiewiczac95bee2008-04-26 22:25:14 +0200297 .port_ops = &sc1200_port_ops,
Bartlomiej Zolnierkiewicz5e37bdc2008-04-26 22:25:24 +0200298 .dma_ops = &sc1200_dma_ops,
Bartlomiej Zolnierkiewicz1c513612007-10-19 00:30:10 +0200299 .host_flags = IDE_HFLAG_SERIALIZE |
300 IDE_HFLAG_POST_SET_MODE |
Bartlomiej Zolnierkiewicz5e71d9c2008-04-26 17:36:35 +0200301 IDE_HFLAG_ABUSE_DMA_MODES,
Bartlomiej Zolnierkiewicz4099d142007-07-20 01:11:59 +0200302 .pio_mask = ATA_PIO4,
Bartlomiej Zolnierkiewicz5f8b6c32007-10-19 00:30:07 +0200303 .mwdma_mask = ATA_MWDMA2,
304 .udma_mask = ATA_UDMA2,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700305};
306
307static int __devinit sc1200_init_one(struct pci_dev *dev, const struct pci_device_id *id)
308{
Bartlomiej Zolnierkiewicz96776f32008-07-24 22:53:16 +0200309 struct sc1200_saved_state *ss = NULL;
310 int rc;
311
312#ifdef CONFIG_PM
313 ss = kmalloc(sizeof(*ss), GFP_KERNEL);
314 if (ss == NULL)
315 return -ENOMEM;
316#endif
317 rc = ide_pci_init_one(dev, &sc1200_chipset, ss);
318 if (rc)
319 kfree(ss);
320
321 return rc;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700322}
323
Bartlomiej Zolnierkiewicz9cbcc5e2007-10-16 22:29:56 +0200324static const struct pci_device_id sc1200_pci_tbl[] = {
325 { PCI_VDEVICE(NS, PCI_DEVICE_ID_NS_SCx200_IDE), 0},
Linus Torvalds1da177e2005-04-16 15:20:36 -0700326 { 0, },
327};
328MODULE_DEVICE_TABLE(pci, sc1200_pci_tbl);
329
330static struct pci_driver driver = {
331 .name = "SC1200_IDE",
332 .id_table = sc1200_pci_tbl,
333 .probe = sc1200_init_one,
Bartlomiej Zolnierkiewicz991f5e62008-07-24 22:53:24 +0200334 .remove = ide_pci_remove,
Alexey Dobriyanb86cc292006-10-03 01:14:32 -0700335#ifdef CONFIG_PM
Linus Torvalds1da177e2005-04-16 15:20:36 -0700336 .suspend = sc1200_suspend,
337 .resume = sc1200_resume,
Alexey Dobriyanb86cc292006-10-03 01:14:32 -0700338#endif
Linus Torvalds1da177e2005-04-16 15:20:36 -0700339};
340
Bartlomiej Zolnierkiewicz82ab1ee2007-01-27 13:46:56 +0100341static int __init sc1200_ide_init(void)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700342{
343 return ide_pci_register_driver(&driver);
344}
345
Bartlomiej Zolnierkiewicz991f5e62008-07-24 22:53:24 +0200346static void __exit sc1200_ide_exit(void)
347{
348 pci_unregister_driver(&driver);
349}
350
Linus Torvalds1da177e2005-04-16 15:20:36 -0700351module_init(sc1200_ide_init);
Bartlomiej Zolnierkiewicz991f5e62008-07-24 22:53:24 +0200352module_exit(sc1200_ide_exit);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700353
354MODULE_AUTHOR("Mark Lord");
355MODULE_DESCRIPTION("PCI driver module for NS SC1200 IDE");
356MODULE_LICENSE("GPL");