2 * Copyright (C) 2000-2002 Mark Lord <mlord@pobox.com>
3 * Copyright (C) 2007 Bartlomiej Zolnierkiewicz
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/hdreg.h>
18 #include <linux/pci.h>
19 #include <linux/init.h>
20 #include <linux/ide.h>
25 #define DRV_NAME "sc1200"
27 #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
33 #define PCI_CLK_33 0x00
34 #define PCI_CLK_48 0x01
35 #define PCI_CLK_66 0x02
36 #define PCI_CLK_33A 0x03
38 static unsigned short sc1200_get_pci_clock (void)
40 unsigned char chip_id, silicon_revision;
41 unsigned int pci_clock;
43 * Check the silicon revision, as not all versions of the chip
44 * have the register with the fast PCI bus timings.
46 chip_id = inb (0x903c);
47 silicon_revision = inb (0x903d);
49 // Read the fast pci clock frequency
50 if (chip_id == 0x04 && silicon_revision < SC1200_REV_B1) {
51 pci_clock = PCI_CLK_33;
53 // check clock generator configuration (cfcc)
54 // the clock is in bits 8 and 9 of this word
56 pci_clock = inw (0x901e);
59 if (pci_clock == PCI_CLK_33A)
60 pci_clock = PCI_CLK_33;
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.
70 static 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
77 * After chip reset, the PIO timings are set to 0x00009172, which is not valid.
79 //#define SC1200_BAD_PIO(timings) (((timings)&~0x80000000)==0x00009172)
81 static void sc1200_tunepio(ide_drive_t *drive, u8 pio)
83 ide_hwif_t *hwif = drive->hwif;
84 struct pci_dev *pdev = to_pci_dev(hwif->dev);
85 unsigned int basereg = hwif->channel ? 0x50 : 0x40, format = 0;
87 pci_read_config_dword(pdev, basereg + 4, &format);
88 format = (format >> 31) & 1;
90 format += sc1200_get_pci_clock();
91 pci_write_config_dword(pdev, basereg + ((drive->dn & 1) << 3),
92 sc1200_pio_timings[format][pio]);
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.
104 static u8 sc1200_udma_filter(ide_drive_t *drive)
106 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;
111 if (mate->present == 0)
114 if ((mateid->capability & 1) && __ide_dma_bad_drive(mate) == 0) {
115 if ((mateid->field_valid & 4) && (mateid->dma_ultra & 7))
117 if ((mateid->field_valid & 2) && (mateid->dma_mword & 7))
124 static void sc1200_set_dma_mode(ide_drive_t *drive, const u8 mode)
126 ide_hwif_t *hwif = HWIF(drive);
127 struct pci_dev *dev = to_pci_dev(hwif->dev);
128 int unit = drive->select.b.unit;
129 unsigned int reg, timings;
130 unsigned short pci_clock;
131 unsigned int basereg = hwif->channel ? 0x50 : 0x40;
133 static const u32 udma_timing[3][3] = {
134 { 0x00921250, 0x00911140, 0x00911030 },
135 { 0x00932470, 0x00922260, 0x00922140 },
136 { 0x009436a1, 0x00933481, 0x00923261 },
139 static const u32 mwdma_timing[3][3] = {
140 { 0x00077771, 0x00012121, 0x00002020 },
141 { 0x000bbbb2, 0x00024241, 0x00013131 },
142 { 0x000ffff3, 0x00035352, 0x00015151 },
145 pci_clock = sc1200_get_pci_clock();
148 * Note that each DMA mode has several timings associated with it.
149 * The correct timing depends on the fast PCI clock freq.
152 if (mode >= XFER_UDMA_0)
153 timings = udma_timing[pci_clock][mode - XFER_UDMA_0];
155 timings = mwdma_timing[pci_clock][mode - XFER_MW_DMA_0];
157 if (unit == 0) { /* are we configuring drive0? */
158 pci_read_config_dword(dev, basereg + 4, ®);
159 timings |= reg & 0x80000000; /* preserve PIO format bit */
160 pci_write_config_dword(dev, basereg + 4, timings);
162 pci_write_config_dword(dev, basereg + 12, timings);
165 /* Replacement for the standard ide_dma_end action in
168 * returns 1 on error, 0 otherwise
170 static int sc1200_dma_end(ide_drive_t *drive)
172 ide_hwif_t *hwif = HWIF(drive);
173 unsigned long dma_base = hwif->dma_base;
176 dma_stat = inb(dma_base+2); /* get DMA status */
179 printk(" ide_dma_end dma_stat=%0x err=%x newerr=%x\n",
180 dma_stat, ((dma_stat&7)!=4), ((dma_stat&2)==2));
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 */
185 drive->waiting_for_dma = 0;
186 ide_destroy_dmatable(drive); /* purge DMA mappings */
188 return (dma_stat & 7) != 4; /* verify good DMA status */
192 * sc1200_set_pio_mode() handles setting of PIO modes
193 * for both the chipset and drive.
195 * All existing BIOSs for this chipset guarantee that all drives
196 * will have valid default PIO timings set up before we get here.
199 static void sc1200_set_pio_mode(ide_drive_t *drive, const u8 pio)
201 ide_hwif_t *hwif = HWIF(drive);
205 * bad abuse of ->set_pio_mode interface
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;
216 printk("SC1200: %s: changing (U)DMA mode\n", drive->name);
217 ide_dma_off_quietly(drive);
218 if (ide_set_dma_mode(drive, mode) == 0 && drive->using_dma)
219 hwif->dma_ops->dma_host_set(drive, 1);
223 sc1200_tunepio(drive, pio);
227 struct sc1200_saved_state {
231 static int sc1200_suspend (struct pci_dev *dev, pm_message_t state)
233 printk("SC1200: suspend(%u)\n", state.event);
236 * we only save state when going from full power to less
238 if (state.event == PM_EVENT_ON) {
239 struct ide_host *host = pci_get_drvdata(dev);
240 struct sc1200_saved_state *ss = host->host_priv;
244 * save timing registers
245 * (this may be unnecessary if BIOS also does it)
247 for (r = 0; r < 8; r++)
248 pci_read_config_dword(dev, 0x40 + r * 4, &ss->regs[r]);
251 pci_disable_device(dev);
252 pci_set_power_state(dev, pci_choose_state(dev, state));
256 static int sc1200_resume (struct pci_dev *dev)
258 struct ide_host *host = pci_get_drvdata(dev);
259 struct sc1200_saved_state *ss = host->host_priv;
263 i = pci_enable_device(dev);
268 * restore timing registers
269 * (this may be unnecessary if BIOS also does it)
271 for (r = 0; r < 8; r++)
272 pci_write_config_dword(dev, 0x40 + r * 4, ss->regs[r]);
278 static 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,
284 static 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,
289 .dma_end = sc1200_dma_end,
290 .dma_test_irq = ide_dma_test_irq,
291 .dma_lost_irq = ide_dma_lost_irq,
292 .dma_timeout = ide_dma_timeout,
295 static const struct ide_port_info sc1200_chipset __devinitdata = {
297 .port_ops = &sc1200_port_ops,
298 .dma_ops = &sc1200_dma_ops,
299 .host_flags = IDE_HFLAG_SERIALIZE |
300 IDE_HFLAG_POST_SET_MODE |
301 IDE_HFLAG_ABUSE_DMA_MODES,
302 .pio_mask = ATA_PIO4,
303 .mwdma_mask = ATA_MWDMA2,
304 .udma_mask = ATA_UDMA2,
307 static int __devinit sc1200_init_one(struct pci_dev *dev, const struct pci_device_id *id)
309 struct sc1200_saved_state *ss = NULL;
313 ss = kmalloc(sizeof(*ss), GFP_KERNEL);
317 rc = ide_pci_init_one(dev, &sc1200_chipset, ss);
324 static const struct pci_device_id sc1200_pci_tbl[] = {
325 { PCI_VDEVICE(NS, PCI_DEVICE_ID_NS_SCx200_IDE), 0},
328 MODULE_DEVICE_TABLE(pci, sc1200_pci_tbl);
330 static struct pci_driver driver = {
331 .name = "SC1200_IDE",
332 .id_table = sc1200_pci_tbl,
333 .probe = sc1200_init_one,
334 .remove = ide_pci_remove,
336 .suspend = sc1200_suspend,
337 .resume = sc1200_resume,
341 static int __init sc1200_ide_init(void)
343 return ide_pci_register_driver(&driver);
346 static void __exit sc1200_ide_exit(void)
348 pci_unregister_driver(&driver);
351 module_init(sc1200_ide_init);
352 module_exit(sc1200_ide_exit);
354 MODULE_AUTHOR("Mark Lord");
355 MODULE_DESCRIPTION("PCI driver module for NS SC1200 IDE");
356 MODULE_LICENSE("GPL");