diff options
Diffstat (limited to 'drivers/ide/tc86c001.c')
| -rw-r--r-- | drivers/ide/tc86c001.c | 270 |
1 files changed, 270 insertions, 0 deletions
diff --git a/drivers/ide/tc86c001.c b/drivers/ide/tc86c001.c new file mode 100644 index 00000000000..93e2cce4b29 --- /dev/null +++ b/drivers/ide/tc86c001.c @@ -0,0 +1,270 @@ +/* + * Copyright (C) 2002 Toshiba Corporation + * Copyright (C) 2005-2006 MontaVista Software, Inc. <source@mvista.com> + * + * This file is licensed under the terms of the GNU General Public + * License version 2. This program is licensed "as is" without any + * warranty of any kind, whether express or implied. + */ + +#include <linux/types.h> +#include <linux/pci.h> +#include <linux/ide.h> + +#define DRV_NAME "tc86c001" + +static void tc86c001_set_mode(ide_drive_t *drive, const u8 speed) +{ + ide_hwif_t *hwif = HWIF(drive); + unsigned long scr_port = hwif->config_data + (drive->dn ? 0x02 : 0x00); + u16 mode, scr = inw(scr_port); + + switch (speed) { + case XFER_UDMA_4: mode = 0x00c0; break; + case XFER_UDMA_3: mode = 0x00b0; break; + case XFER_UDMA_2: mode = 0x00a0; break; + case XFER_UDMA_1: mode = 0x0090; break; + case XFER_UDMA_0: mode = 0x0080; break; + case XFER_MW_DMA_2: mode = 0x0070; break; + case XFER_MW_DMA_1: mode = 0x0060; break; + case XFER_MW_DMA_0: mode = 0x0050; break; + case XFER_PIO_4: mode = 0x0400; break; + case XFER_PIO_3: mode = 0x0300; break; + case XFER_PIO_2: mode = 0x0200; break; + case XFER_PIO_1: mode = 0x0100; break; + case XFER_PIO_0: + default: mode = 0x0000; break; + } + + scr &= (speed < XFER_MW_DMA_0) ? 0xf8ff : 0xff0f; + scr |= mode; + outw(scr, scr_port); +} + +static void tc86c001_set_pio_mode(ide_drive_t *drive, const u8 pio) +{ + tc86c001_set_mode(drive, XFER_PIO_0 + pio); +} + +/* + * HACKITY HACK + * + * This is a workaround for the limitation 5 of the TC86C001 IDE controller: + * if a DMA transfer terminates prematurely, the controller leaves the device's + * interrupt request (INTRQ) pending and does not generate a PCI interrupt (or + * set the interrupt bit in the DMA status register), thus no PCI interrupt + * will occur until a DMA transfer has been successfully completed. + * + * We work around this by initiating dummy, zero-length DMA transfer on + * a DMA timeout expiration. I found no better way to do this with the current + * IDE core than to temporarily replace a higher level driver's timer expiry + * handler with our own backing up to that handler in case our recovery fails. + */ +static int tc86c001_timer_expiry(ide_drive_t *drive) +{ + ide_hwif_t *hwif = HWIF(drive); + ide_expiry_t *expiry = ide_get_hwifdata(hwif); + ide_hwgroup_t *hwgroup = HWGROUP(drive); + u8 dma_stat = inb(hwif->dma_base + ATA_DMA_STATUS); + + /* Restore a higher level driver's expiry handler first. */ + hwgroup->expiry = expiry; + + if ((dma_stat & 5) == 1) { /* DMA active and no interrupt */ + unsigned long sc_base = hwif->config_data; + unsigned long twcr_port = sc_base + (drive->dn ? 0x06 : 0x04); + u8 dma_cmd = inb(hwif->dma_base + ATA_DMA_CMD); + + printk(KERN_WARNING "%s: DMA interrupt possibly stuck, " + "attempting recovery...\n", drive->name); + + /* Stop DMA */ + outb(dma_cmd & ~0x01, hwif->dma_base + ATA_DMA_CMD); + + /* Setup the dummy DMA transfer */ + outw(0, sc_base + 0x0a); /* Sector Count */ + outw(0, twcr_port); /* Transfer Word Count 1 or 2 */ + + /* Start the dummy DMA transfer */ + + /* clear R_OR_WCTR for write */ + outb(0x00, hwif->dma_base + ATA_DMA_CMD); + /* set START_STOPBM */ + outb(0x01, hwif->dma_base + ATA_DMA_CMD); + + /* + * If an interrupt was pending, it should come thru shortly. + * If not, a higher level driver's expiry handler should + * eventually cause some kind of recovery from the DMA stall. + */ + return WAIT_MIN_SLEEP; + } + + /* Chain to the restored expiry handler if DMA wasn't active. */ + if (likely(expiry != NULL)) + return expiry(drive); + + /* If there was no handler, "emulate" that for ide_timer_expiry()... */ + return -1; +} + +static void tc86c001_dma_start(ide_drive_t *drive) +{ + ide_hwif_t *hwif = HWIF(drive); + ide_hwgroup_t *hwgroup = HWGROUP(drive); + unsigned long sc_base = hwif->config_data; + unsigned long twcr_port = sc_base + (drive->dn ? 0x06 : 0x04); + unsigned long nsectors = hwgroup->rq->nr_sectors; + + /* + * We have to manually load the sector count and size into + * the appropriate system control registers for DMA to work + * with LBA48 and ATAPI devices... + */ + outw(nsectors, sc_base + 0x0a); /* Sector Count */ + outw(SECTOR_SIZE / 2, twcr_port); /* Transfer Word Count 1/2 */ + + /* Install our timeout expiry hook, saving the current handler... */ + ide_set_hwifdata(hwif, hwgroup->expiry); + hwgroup->expiry = &tc86c001_timer_expiry; + + ide_dma_start(drive); +} + +static u8 tc86c001_cable_detect(ide_hwif_t *hwif) +{ + struct pci_dev *dev = to_pci_dev(hwif->dev); + unsigned long sc_base = pci_resource_start(dev, 5); + u16 scr1 = inw(sc_base + 0x00); + + /* + * System Control 1 Register bit 13 (PDIAGN): + * 0=80-pin cable, 1=40-pin cable + */ + return (scr1 & 0x2000) ? ATA_CBL_PATA40 : ATA_CBL_PATA80; +} + +static void __devinit init_hwif_tc86c001(ide_hwif_t *hwif) +{ + struct pci_dev *dev = to_pci_dev(hwif->dev); + unsigned long sc_base = pci_resource_start(dev, 5); + u16 scr1 = inw(sc_base + 0x00); + + /* System Control 1 Register bit 15 (Soft Reset) set */ + outw(scr1 | 0x8000, sc_base + 0x00); + + /* System Control 1 Register bit 14 (FIFO Reset) set */ + outw(scr1 | 0x4000, sc_base + 0x00); + + /* System Control 1 Register: reset clear */ + outw(scr1 & ~0xc000, sc_base + 0x00); + + /* Store the system control register base for convenience... */ + hwif->config_data = sc_base; + + if (!hwif->dma_base) + return; + + /* + * Sector Count Control Register bits 0 and 1 set: + * software sets Sector Count Register for master and slave device + */ + outw(0x0003, sc_base + 0x0c); + + /* Sector Count Register limit */ + hwif->rqsize = 0xffff; +} + +static const struct ide_port_ops tc86c001_port_ops = { + .set_pio_mode = tc86c001_set_pio_mode, + .set_dma_mode = tc86c001_set_mode, + .cable_detect = tc86c001_cable_detect, +}; + +static const struct ide_dma_ops tc86c001_dma_ops = { + .dma_host_set = ide_dma_host_set, + .dma_setup = ide_dma_setup, + .dma_exec_cmd = ide_dma_exec_cmd, + .dma_start = tc86c001_dma_start, + .dma_end = ide_dma_end, + .dma_test_irq = ide_dma_test_irq, + .dma_lost_irq = ide_dma_lost_irq, + .dma_timeout = ide_dma_timeout, +}; + +static const struct ide_port_info tc86c001_chipset __devinitdata = { + .name = DRV_NAME, + .init_hwif = init_hwif_tc86c001, + .port_ops = &tc86c001_port_ops, + .dma_ops = &tc86c001_dma_ops, + .host_flags = IDE_HFLAG_SINGLE | IDE_HFLAG_OFF_BOARD, + .pio_mask = ATA_PIO4, + .mwdma_mask = ATA_MWDMA2, + .udma_mask = ATA_UDMA4, +}; + +static int __devinit tc86c001_init_one(struct pci_dev *dev, + const struct pci_device_id *id) +{ + int rc; + + rc = pci_enable_device(dev); + if (rc) + goto out; + + rc = pci_request_region(dev, 5, DRV_NAME); + if (rc) { + printk(KERN_ERR DRV_NAME ": system control regs already in use"); + goto out_disable; + } + + rc = ide_pci_init_one(dev, &tc86c001_chipset, NULL); + if (rc) + goto out_release; + + goto out; + +out_release: + pci_release_region(dev, 5); +out_disable: + pci_disable_device(dev); +out: + return rc; +} + +static void __devexit tc86c001_remove(struct pci_dev *dev) +{ + ide_pci_remove(dev); + pci_release_region(dev, 5); + pci_disable_device(dev); +} + +static const struct pci_device_id tc86c001_pci_tbl[] = { + { PCI_VDEVICE(TOSHIBA_2, PCI_DEVICE_ID_TOSHIBA_TC86C001_IDE), 0 }, + { 0, } +}; +MODULE_DEVICE_TABLE(pci, tc86c001_pci_tbl); + +static struct pci_driver tc86c001_pci_driver = { + .name = "TC86C001", + .id_table = tc86c001_pci_tbl, + .probe = tc86c001_init_one, + .remove = __devexit_p(tc86c001_remove), +}; + +static int __init tc86c001_ide_init(void) +{ + return ide_pci_register_driver(&tc86c001_pci_driver); +} + +static void __exit tc86c001_ide_exit(void) +{ + pci_unregister_driver(&tc86c001_pci_driver); +} + +module_init(tc86c001_ide_init); +module_exit(tc86c001_ide_exit); + +MODULE_AUTHOR("MontaVista Software, Inc. <source@mvista.com>"); +MODULE_DESCRIPTION("PCI driver module for TC86C001 IDE"); +MODULE_LICENSE("GPL"); |