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 int tc86c001_tune_chipset(ide_drive_t *drive, 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 = hwif->INW(scr_port);
22 speed = ide_rate_filter(drive, speed);
25 case XFER_UDMA_4: mode = 0x00c0; break;
26 case XFER_UDMA_3: mode = 0x00b0; break;
27 case XFER_UDMA_2: mode = 0x00a0; break;
28 case XFER_UDMA_1: mode = 0x0090; break;
29 case XFER_UDMA_0: mode = 0x0080; break;
30 case XFER_MW_DMA_2: mode = 0x0070; break;
31 case XFER_MW_DMA_1: mode = 0x0060; break;
32 case XFER_MW_DMA_0: mode = 0x0050; break;
33 case XFER_PIO_4: mode = 0x0400; break;
34 case XFER_PIO_3: mode = 0x0300; break;
35 case XFER_PIO_2: mode = 0x0200; break;
36 case XFER_PIO_1: mode = 0x0100; break;
38 default: mode = 0x0000; break;
41 scr &= (speed < XFER_MW_DMA_0) ? 0xf8ff : 0xff0f;
45 return ide_config_drive_speed(drive, speed);
48 static void tc86c001_tune_drive(ide_drive_t *drive, u8 pio)
50 pio = ide_get_best_pio_mode(drive, pio, 4);
51 (void) tc86c001_tune_chipset(drive, XFER_PIO_0 + pio);
57 * This is a workaround for the limitation 5 of the TC86C001 IDE controller:
58 * if a DMA transfer terminates prematurely, the controller leaves the device's
59 * interrupt request (INTRQ) pending and does not generate a PCI interrupt (or
60 * set the interrupt bit in the DMA status register), thus no PCI interrupt
61 * will occur until a DMA transfer has been successfully completed.
63 * We work around this by initiating dummy, zero-length DMA transfer on
64 * a DMA timeout expiration. I found no better way to do this with the current
65 * IDE core than to temporarily replace a higher level driver's timer expiry
66 * handler with our own backing up to that handler in case our recovery fails.
68 static int tc86c001_timer_expiry(ide_drive_t *drive)
70 ide_hwif_t *hwif = HWIF(drive);
71 ide_expiry_t *expiry = ide_get_hwifdata(hwif);
72 ide_hwgroup_t *hwgroup = HWGROUP(drive);
73 u8 dma_stat = hwif->INB(hwif->dma_status);
75 /* Restore a higher level driver's expiry handler first. */
76 hwgroup->expiry = expiry;
78 if ((dma_stat & 5) == 1) { /* DMA active and no interrupt */
79 unsigned long sc_base = hwif->config_data;
80 unsigned long twcr_port = sc_base + (drive->dn ? 0x06 : 0x04);
81 u8 dma_cmd = hwif->INB(hwif->dma_command);
83 printk(KERN_WARNING "%s: DMA interrupt possibly stuck, "
84 "attempting recovery...\n", drive->name);
87 outb(dma_cmd & ~0x01, hwif->dma_command);
89 /* Setup the dummy DMA transfer */
90 outw(0, sc_base + 0x0a); /* Sector Count */
91 outw(0, twcr_port); /* Transfer Word Count 1 or 2 */
93 /* Start the dummy DMA transfer */
94 outb(0x00, hwif->dma_command); /* clear R_OR_WCTR for write */
95 outb(0x01, hwif->dma_command); /* set START_STOPBM */
98 * If an interrupt was pending, it should come thru shortly.
99 * If not, a higher level driver's expiry handler should
100 * eventually cause some kind of recovery from the DMA stall.
102 return WAIT_MIN_SLEEP;
105 /* Chain to the restored expiry handler if DMA wasn't active. */
106 if (likely(expiry != NULL))
107 return expiry(drive);
109 /* If there was no handler, "emulate" that for ide_timer_expiry()... */
113 static void tc86c001_dma_start(ide_drive_t *drive)
115 ide_hwif_t *hwif = HWIF(drive);
116 ide_hwgroup_t *hwgroup = HWGROUP(drive);
117 unsigned long sc_base = hwif->config_data;
118 unsigned long twcr_port = sc_base + (drive->dn ? 0x06 : 0x04);
119 unsigned long nsectors = hwgroup->rq->nr_sectors;
122 * We have to manually load the sector count and size into
123 * the appropriate system control registers for DMA to work
124 * with LBA48 and ATAPI devices...
126 outw(nsectors, sc_base + 0x0a); /* Sector Count */
127 outw(SECTOR_SIZE / 2, twcr_port); /* Transfer Word Count 1/2 */
129 /* Install our timeout expiry hook, saving the current handler... */
130 ide_set_hwifdata(hwif, hwgroup->expiry);
131 hwgroup->expiry = &tc86c001_timer_expiry;
133 ide_dma_start(drive);
136 static int tc86c001_busproc(ide_drive_t *drive, int state)
138 ide_hwif_t *hwif = HWIF(drive);
139 unsigned long sc_base = hwif->config_data;
142 /* System Control 1 Register bit 11 (ATA Hard Reset) read */
143 scr1 = hwif->INW(sc_base + 0x00);
147 if (!(scr1 & 0x0800))
151 hwif->drives[0].failures = hwif->drives[1].failures = 0;
158 hwif->drives[0].failures = hwif->drives[0].max_failures + 1;
159 hwif->drives[1].failures = hwif->drives[1].max_failures + 1;
165 /* System Control 1 Register bit 11 (ATA Hard Reset) write */
166 outw(scr1, sc_base + 0x00);
170 static int tc86c001_config_drive_xfer_rate(ide_drive_t *drive)
172 if (ide_tune_dma(drive))
175 if (ide_use_fast_pio(drive))
176 tc86c001_tune_drive(drive, 255);
181 static void __devinit init_hwif_tc86c001(ide_hwif_t *hwif)
183 unsigned long sc_base = pci_resource_start(hwif->pci_dev, 5);
184 u16 scr1 = hwif->INW(sc_base + 0x00);;
186 /* System Control 1 Register bit 15 (Soft Reset) set */
187 outw(scr1 | 0x8000, sc_base + 0x00);
189 /* System Control 1 Register bit 14 (FIFO Reset) set */
190 outw(scr1 | 0x4000, sc_base + 0x00);
192 /* System Control 1 Register: reset clear */
193 outw(scr1 & ~0xc000, sc_base + 0x00);
195 /* Store the system control register base for convenience... */
196 hwif->config_data = sc_base;
198 hwif->tuneproc = &tc86c001_tune_drive;
199 hwif->speedproc = &tc86c001_tune_chipset;
200 hwif->busproc = &tc86c001_busproc;
202 hwif->drives[0].autotune = hwif->drives[1].autotune = 1;
208 * Sector Count Control Register bits 0 and 1 set:
209 * software sets Sector Count Register for master and slave device
211 outw(0x0003, sc_base + 0x0c);
213 /* Sector Count Register limit */
214 hwif->rqsize = 0xffff;
217 hwif->ultra_mask = 0x1f;
218 hwif->mwdma_mask = 0x07;
220 hwif->ide_dma_check = &tc86c001_config_drive_xfer_rate;
221 hwif->dma_start = &tc86c001_dma_start;
223 if (hwif->cbl != ATA_CBL_PATA40_SHORT) {
225 * System Control 1 Register bit 13 (PDIAGN):
226 * 0=80-pin cable, 1=40-pin cable
228 scr1 = hwif->INW(sc_base + 0x00);
229 hwif->cbl = (scr1 & 0x2000) ? ATA_CBL_PATA40 : ATA_CBL_PATA80;
234 hwif->drives[0].autodma = hwif->drives[1].autodma = hwif->autodma;
237 static unsigned int __devinit init_chipset_tc86c001(struct pci_dev *dev,
240 int err = pci_request_region(dev, 5, name);
243 printk(KERN_ERR "%s: system control regs already in use", name);
247 static ide_pci_device_t tc86c001_chipset __devinitdata = {
249 .init_chipset = init_chipset_tc86c001,
250 .init_hwif = init_hwif_tc86c001,
252 .bootable = OFF_BOARD,
253 .host_flags = IDE_HFLAG_SINGLE,
254 .pio_mask = ATA_PIO4,
257 static int __devinit tc86c001_init_one(struct pci_dev *dev,
258 const struct pci_device_id *id)
260 return ide_setup_pci_device(dev, &tc86c001_chipset);
263 static struct pci_device_id tc86c001_pci_tbl[] = {
264 { PCI_VENDOR_ID_TOSHIBA_2, PCI_DEVICE_ID_TOSHIBA_TC86C001_IDE,
265 PCI_ANY_ID, PCI_ANY_ID, 0, 0, 0},
268 MODULE_DEVICE_TABLE(pci, tc86c001_pci_tbl);
270 static struct pci_driver driver = {
272 .id_table = tc86c001_pci_tbl,
273 .probe = tc86c001_init_one
276 static int __init tc86c001_ide_init(void)
278 return ide_pci_register_driver(&driver);
280 module_init(tc86c001_ide_init);
282 MODULE_AUTHOR("MontaVista Software, Inc. <source@mvista.com>");
283 MODULE_DESCRIPTION("PCI driver module for TC86C001 IDE");
284 MODULE_LICENSE("GPL");