2 * drivers/ide/pci/tc86c001.c Version 1.00 Dec 12, 2006
4 * Copyright (C) 2002 Toshiba Corporation
5 * Copyright (C) 2005-2006 MontaVista Software, Inc. <source@mvista.com>
7 * This file is licensed under the terms of the GNU General Public
8 * License version 2. This program is licensed "as is" without any
9 * warranty of any kind, whether express or implied.
12 #include <linux/types.h>
13 #include <linux/pci.h>
14 #include <linux/ide.h>
16 static inline u8 tc86c001_ratemask(ide_drive_t *drive)
18 return eighty_ninty_three(drive) ? 2 : 1;
21 static int tc86c001_tune_chipset(ide_drive_t *drive, u8 speed)
23 ide_hwif_t *hwif = HWIF(drive);
24 unsigned long scr_port = hwif->config_data + (drive->dn ? 0x02 : 0x00);
25 u16 mode, scr = hwif->INW(scr_port);
27 speed = ide_rate_filter(tc86c001_ratemask(drive), speed);
30 case XFER_UDMA_4: mode = 0x00c0; break;
31 case XFER_UDMA_3: mode = 0x00b0; break;
32 case XFER_UDMA_2: mode = 0x00a0; break;
33 case XFER_UDMA_1: mode = 0x0090; break;
34 case XFER_UDMA_0: mode = 0x0080; break;
35 case XFER_MW_DMA_2: mode = 0x0070; break;
36 case XFER_MW_DMA_1: mode = 0x0060; break;
37 case XFER_MW_DMA_0: mode = 0x0050; break;
38 case XFER_PIO_4: mode = 0x0400; break;
39 case XFER_PIO_3: mode = 0x0300; break;
40 case XFER_PIO_2: mode = 0x0200; break;
41 case XFER_PIO_1: mode = 0x0100; break;
43 default: mode = 0x0000; break;
46 scr &= (speed < XFER_MW_DMA_0) ? 0xf8ff : 0xff0f;
48 hwif->OUTW(scr, scr_port);
50 return ide_config_drive_speed(drive, speed);
53 static void tc86c001_tune_drive(ide_drive_t *drive, u8 pio)
55 pio = ide_get_best_pio_mode(drive, pio, 4, NULL);
56 (void) tc86c001_tune_chipset(drive, XFER_PIO_0 + pio);
62 * This is a workaround for the limitation 5 of the TC86C001 IDE controller:
63 * if a DMA transfer terminates prematurely, the controller leaves the device's
64 * interrupt request (INTRQ) pending and does not generate a PCI interrupt (or
65 * set the interrupt bit in the DMA status register), thus no PCI interrupt
66 * will occur until a DMA transfer has been successfully completed.
68 * We work around this by initiating dummy, zero-length DMA transfer on
69 * a DMA timeout expiration. I found no better way to do this with the current
70 * IDE core than to temporarily replace a higher level driver's timer expiry
71 * handler with our own backing up to that handler in case our recovery fails.
73 static int tc86c001_timer_expiry(ide_drive_t *drive)
75 ide_hwif_t *hwif = HWIF(drive);
76 ide_expiry_t *expiry = ide_get_hwifdata(hwif);
77 ide_hwgroup_t *hwgroup = HWGROUP(drive);
78 u8 dma_stat = hwif->INB(hwif->dma_status);
80 /* Restore a higher level driver's expiry handler first. */
81 hwgroup->expiry = expiry;
83 if ((dma_stat & 5) == 1) { /* DMA active and no interrupt */
84 unsigned long sc_base = hwif->config_data;
85 unsigned long twcr_port = sc_base + (drive->dn ? 0x06 : 0x04);
86 u8 dma_cmd = hwif->INB(hwif->dma_command);
88 printk(KERN_WARNING "%s: DMA interrupt possibly stuck, "
89 "attempting recovery...\n", drive->name);
92 hwif->OUTB(dma_cmd & ~0x01, hwif->dma_command);
94 /* Setup the dummy DMA transfer */
95 hwif->OUTW(0, sc_base + 0x0a); /* Sector Count */
96 hwif->OUTW(0, twcr_port); /* Transfer Word Count 1 or 2 */
98 /* Start the dummy DMA transfer */
99 hwif->OUTB(0x00, hwif->dma_command); /* clear R_OR_WCTR for write */
100 hwif->OUTB(0x01, hwif->dma_command); /* set START_STOPBM */
103 * If an interrupt was pending, it should come thru shortly.
104 * If not, a higher level driver's expiry handler should
105 * eventually cause some kind of recovery from the DMA stall.
107 return WAIT_MIN_SLEEP;
110 /* Chain to the restored expiry handler if DMA wasn't active. */
111 if (likely(expiry != NULL))
112 return expiry(drive);
114 /* If there was no handler, "emulate" that for ide_timer_expiry()... */
118 static void tc86c001_dma_start(ide_drive_t *drive)
120 ide_hwif_t *hwif = HWIF(drive);
121 ide_hwgroup_t *hwgroup = HWGROUP(drive);
122 unsigned long sc_base = hwif->config_data;
123 unsigned long twcr_port = sc_base + (drive->dn ? 0x06 : 0x04);
124 unsigned long nsectors = hwgroup->rq->nr_sectors;
127 * We have to manually load the sector count and size into
128 * the appropriate system control registers for DMA to work
129 * with LBA48 and ATAPI devices...
131 hwif->OUTW(nsectors, sc_base + 0x0a); /* Sector Count */
132 hwif->OUTW(SECTOR_SIZE / 2, twcr_port); /* Transfer Word Count 1/2 */
134 /* Install our timeout expiry hook, saving the current handler... */
135 ide_set_hwifdata(hwif, hwgroup->expiry);
136 hwgroup->expiry = &tc86c001_timer_expiry;
138 ide_dma_start(drive);
141 static int tc86c001_busproc(ide_drive_t *drive, int state)
143 ide_hwif_t *hwif = HWIF(drive);
144 unsigned long sc_base = hwif->config_data;
147 /* System Control 1 Register bit 11 (ATA Hard Reset) read */
148 scr1 = hwif->INW(sc_base + 0x00);
152 if (!(scr1 & 0x0800))
156 hwif->drives[0].failures = hwif->drives[1].failures = 0;
163 hwif->drives[0].failures = hwif->drives[0].max_failures + 1;
164 hwif->drives[1].failures = hwif->drives[1].max_failures + 1;
170 /* System Control 1 Register bit 11 (ATA Hard Reset) write */
171 hwif->OUTW(scr1, sc_base + 0x00);
175 static int config_chipset_for_dma(ide_drive_t *drive)
177 u8 speed = ide_dma_speed(drive, tc86c001_ratemask(drive));
182 (void) tc86c001_tune_chipset(drive, speed);
183 return ide_dma_enable(drive);
186 static int tc86c001_config_drive_xfer_rate(ide_drive_t *drive)
188 ide_hwif_t *hwif = HWIF(drive);
189 struct hd_driveid *id = drive->id;
191 if ((id->capability & 1) && drive->autodma) {
193 if (ide_use_dma(drive) && config_chipset_for_dma(drive))
194 return hwif->ide_dma_on(drive);
198 } else if ((id->capability & 8) || (id->field_valid & 2)) {
200 tc86c001_tune_drive(drive, 255);
201 return hwif->ide_dma_off_quietly(drive);
203 /* IORDY not supported */
207 static void __devinit init_hwif_tc86c001(ide_hwif_t *hwif)
209 unsigned long sc_base = pci_resource_start(hwif->pci_dev, 5);
210 u16 scr1 = hwif->INW(sc_base + 0x00);;
212 /* System Control 1 Register bit 15 (Soft Reset) set */
213 hwif->OUTW(scr1 | 0x8000, sc_base + 0x00);
215 /* System Control 1 Register bit 14 (FIFO Reset) set */
216 hwif->OUTW(scr1 | 0x4000, sc_base + 0x00);
218 /* System Control 1 Register: reset clear */
219 hwif->OUTW(scr1 & ~0xc000, sc_base + 0x00);
221 /* Store the system control register base for convenience... */
222 hwif->config_data = sc_base;
224 hwif->tuneproc = &tc86c001_tune_drive;
225 hwif->speedproc = &tc86c001_tune_chipset;
226 hwif->busproc = &tc86c001_busproc;
228 hwif->drives[0].autotune = hwif->drives[1].autotune = 1;
234 * Sector Count Control Register bits 0 and 1 set:
235 * software sets Sector Count Register for master and slave device
237 hwif->OUTW(0x0003, sc_base + 0x0c);
239 /* Sector Count Register limit */
240 hwif->rqsize = 0xffff;
243 hwif->ultra_mask = 0x1f;
244 hwif->mwdma_mask = 0x07;
246 hwif->ide_dma_check = &tc86c001_config_drive_xfer_rate;
247 hwif->dma_start = &tc86c001_dma_start;
249 if (!hwif->udma_four) {
251 * System Control 1 Register bit 13 (PDIAGN):
252 * 0=80-pin cable, 1=40-pin cable
254 scr1 = hwif->INW(sc_base + 0x00);
255 hwif->udma_four = (scr1 & 0x2000) ? 0 : 1;
260 hwif->drives[0].autodma = hwif->drives[1].autodma = hwif->autodma;
263 static unsigned int __devinit init_chipset_tc86c001(struct pci_dev *dev,
266 int err = pci_request_region(dev, 5, name);
269 printk(KERN_ERR "%s: system control regs already in use", name);
273 static ide_pci_device_t tc86c001_chipset __devinitdata = {
275 .init_chipset = init_chipset_tc86c001,
276 .init_hwif = init_hwif_tc86c001,
279 .bootable = OFF_BOARD
282 static int __devinit tc86c001_init_one(struct pci_dev *dev,
283 const struct pci_device_id *id)
285 return ide_setup_pci_device(dev, &tc86c001_chipset);
288 static struct pci_device_id tc86c001_pci_tbl[] = {
289 { PCI_VENDOR_ID_TOSHIBA_2, PCI_DEVICE_ID_TOSHIBA_TC86C001_IDE,
290 PCI_ANY_ID, PCI_ANY_ID, 0, 0, 0},
293 MODULE_DEVICE_TABLE(pci, tc86c001_pci_tbl);
295 static struct pci_driver driver = {
297 .id_table = tc86c001_pci_tbl,
298 .probe = tc86c001_init_one
301 static int __init tc86c001_ide_init(void)
303 return ide_pci_register_driver(&driver);
305 module_init(tc86c001_ide_init);
307 MODULE_AUTHOR("MontaVista Software, Inc. <source@mvista.com>");
308 MODULE_DESCRIPTION("PCI driver module for TC86C001 IDE");
309 MODULE_LICENSE("GPL");