2 * drivers/ide/pci/tc86c001.c Version 1.01 Sep 5, 2007
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 void tc86c001_set_mode(ide_drive_t *drive, const u8 speed)
18 ide_hwif_t *hwif = HWIF(drive);
19 unsigned long scr_port = hwif->config_data + (drive->dn ? 0x02 : 0x00);
20 u16 mode, scr = inw(scr_port);
23 case XFER_UDMA_4: mode = 0x00c0; break;
24 case XFER_UDMA_3: mode = 0x00b0; break;
25 case XFER_UDMA_2: mode = 0x00a0; break;
26 case XFER_UDMA_1: mode = 0x0090; break;
27 case XFER_UDMA_0: mode = 0x0080; break;
28 case XFER_MW_DMA_2: mode = 0x0070; break;
29 case XFER_MW_DMA_1: mode = 0x0060; break;
30 case XFER_MW_DMA_0: mode = 0x0050; break;
31 case XFER_PIO_4: mode = 0x0400; break;
32 case XFER_PIO_3: mode = 0x0300; break;
33 case XFER_PIO_2: mode = 0x0200; break;
34 case XFER_PIO_1: mode = 0x0100; break;
36 default: mode = 0x0000; break;
39 scr &= (speed < XFER_MW_DMA_0) ? 0xf8ff : 0xff0f;
44 static void tc86c001_set_pio_mode(ide_drive_t *drive, const u8 pio)
46 tc86c001_set_mode(drive, XFER_PIO_0 + pio);
52 * This is a workaround for the limitation 5 of the TC86C001 IDE controller:
53 * if a DMA transfer terminates prematurely, the controller leaves the device's
54 * interrupt request (INTRQ) pending and does not generate a PCI interrupt (or
55 * set the interrupt bit in the DMA status register), thus no PCI interrupt
56 * will occur until a DMA transfer has been successfully completed.
58 * We work around this by initiating dummy, zero-length DMA transfer on
59 * a DMA timeout expiration. I found no better way to do this with the current
60 * IDE core than to temporarily replace a higher level driver's timer expiry
61 * handler with our own backing up to that handler in case our recovery fails.
63 static int tc86c001_timer_expiry(ide_drive_t *drive)
65 ide_hwif_t *hwif = HWIF(drive);
66 ide_expiry_t *expiry = ide_get_hwifdata(hwif);
67 ide_hwgroup_t *hwgroup = HWGROUP(drive);
68 u8 dma_stat = inb(hwif->dma_status);
70 /* Restore a higher level driver's expiry handler first. */
71 hwgroup->expiry = expiry;
73 if ((dma_stat & 5) == 1) { /* DMA active and no interrupt */
74 unsigned long sc_base = hwif->config_data;
75 unsigned long twcr_port = sc_base + (drive->dn ? 0x06 : 0x04);
76 u8 dma_cmd = inb(hwif->dma_command);
78 printk(KERN_WARNING "%s: DMA interrupt possibly stuck, "
79 "attempting recovery...\n", drive->name);
82 outb(dma_cmd & ~0x01, hwif->dma_command);
84 /* Setup the dummy DMA transfer */
85 outw(0, sc_base + 0x0a); /* Sector Count */
86 outw(0, twcr_port); /* Transfer Word Count 1 or 2 */
88 /* Start the dummy DMA transfer */
89 outb(0x00, hwif->dma_command); /* clear R_OR_WCTR for write */
90 outb(0x01, hwif->dma_command); /* set START_STOPBM */
93 * If an interrupt was pending, it should come thru shortly.
94 * If not, a higher level driver's expiry handler should
95 * eventually cause some kind of recovery from the DMA stall.
97 return WAIT_MIN_SLEEP;
100 /* Chain to the restored expiry handler if DMA wasn't active. */
101 if (likely(expiry != NULL))
102 return expiry(drive);
104 /* If there was no handler, "emulate" that for ide_timer_expiry()... */
108 static void tc86c001_dma_start(ide_drive_t *drive)
110 ide_hwif_t *hwif = HWIF(drive);
111 ide_hwgroup_t *hwgroup = HWGROUP(drive);
112 unsigned long sc_base = hwif->config_data;
113 unsigned long twcr_port = sc_base + (drive->dn ? 0x06 : 0x04);
114 unsigned long nsectors = hwgroup->rq->nr_sectors;
117 * We have to manually load the sector count and size into
118 * the appropriate system control registers for DMA to work
119 * with LBA48 and ATAPI devices...
121 outw(nsectors, sc_base + 0x0a); /* Sector Count */
122 outw(SECTOR_SIZE / 2, twcr_port); /* Transfer Word Count 1/2 */
124 /* Install our timeout expiry hook, saving the current handler... */
125 ide_set_hwifdata(hwif, hwgroup->expiry);
126 hwgroup->expiry = &tc86c001_timer_expiry;
128 ide_dma_start(drive);
131 static int tc86c001_busproc(ide_drive_t *drive, int state)
133 ide_hwif_t *hwif = HWIF(drive);
134 unsigned long sc_base = hwif->config_data;
137 /* System Control 1 Register bit 11 (ATA Hard Reset) read */
138 scr1 = inw(sc_base + 0x00);
142 if (!(scr1 & 0x0800))
146 hwif->drives[0].failures = hwif->drives[1].failures = 0;
153 hwif->drives[0].failures = hwif->drives[0].max_failures + 1;
154 hwif->drives[1].failures = hwif->drives[1].max_failures + 1;
160 /* System Control 1 Register bit 11 (ATA Hard Reset) write */
161 outw(scr1, sc_base + 0x00);
165 static void __devinit init_hwif_tc86c001(ide_hwif_t *hwif)
167 unsigned long sc_base = pci_resource_start(hwif->pci_dev, 5);
168 u16 scr1 = inw(sc_base + 0x00);
170 /* System Control 1 Register bit 15 (Soft Reset) set */
171 outw(scr1 | 0x8000, sc_base + 0x00);
173 /* System Control 1 Register bit 14 (FIFO Reset) set */
174 outw(scr1 | 0x4000, sc_base + 0x00);
176 /* System Control 1 Register: reset clear */
177 outw(scr1 & ~0xc000, sc_base + 0x00);
179 /* Store the system control register base for convenience... */
180 hwif->config_data = sc_base;
182 hwif->set_pio_mode = &tc86c001_set_pio_mode;
183 hwif->set_dma_mode = &tc86c001_set_mode;
185 hwif->busproc = &tc86c001_busproc;
191 * Sector Count Control Register bits 0 and 1 set:
192 * software sets Sector Count Register for master and slave device
194 outw(0x0003, sc_base + 0x0c);
196 /* Sector Count Register limit */
197 hwif->rqsize = 0xffff;
199 hwif->dma_start = &tc86c001_dma_start;
201 if (hwif->cbl != ATA_CBL_PATA40_SHORT) {
203 * System Control 1 Register bit 13 (PDIAGN):
204 * 0=80-pin cable, 1=40-pin cable
206 scr1 = inw(sc_base + 0x00);
207 hwif->cbl = (scr1 & 0x2000) ? ATA_CBL_PATA40 : ATA_CBL_PATA80;
211 static unsigned int __devinit init_chipset_tc86c001(struct pci_dev *dev,
214 int err = pci_request_region(dev, 5, name);
217 printk(KERN_ERR "%s: system control regs already in use", name);
221 static const struct ide_port_info tc86c001_chipset __devinitdata = {
223 .init_chipset = init_chipset_tc86c001,
224 .init_hwif = init_hwif_tc86c001,
225 .host_flags = IDE_HFLAG_SINGLE | IDE_HFLAG_OFF_BOARD,
226 .pio_mask = ATA_PIO4,
227 .mwdma_mask = ATA_MWDMA2,
228 .udma_mask = ATA_UDMA4,
231 static int __devinit tc86c001_init_one(struct pci_dev *dev,
232 const struct pci_device_id *id)
234 return ide_setup_pci_device(dev, &tc86c001_chipset);
237 static const struct pci_device_id tc86c001_pci_tbl[] = {
238 { PCI_VDEVICE(TOSHIBA_2, PCI_DEVICE_ID_TOSHIBA_TC86C001_IDE), 0 },
241 MODULE_DEVICE_TABLE(pci, tc86c001_pci_tbl);
243 static struct pci_driver driver = {
245 .id_table = tc86c001_pci_tbl,
246 .probe = tc86c001_init_one
249 static int __init tc86c001_ide_init(void)
251 return ide_pci_register_driver(&driver);
253 module_init(tc86c001_ide_init);
255 MODULE_AUTHOR("MontaVista Software, Inc. <source@mvista.com>");
256 MODULE_DESCRIPTION("PCI driver module for TC86C001 IDE");
257 MODULE_LICENSE("GPL");