/* * 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> 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_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_command); printk(KERN_WARNING "%s: DMA interrupt possibly stuck, " "attempting recovery...\n", drive->name); /* Stop DMA */ outb(dma_cmd & ~0x01, hwif->dma_command); /* 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 */ outb(0x00, hwif->dma_command); /* clear R_OR_WCTR for write */ outb(0x01, hwif->dma_command); /* set START_STOPBM */ /* * 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 __devinit 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 unsigned int __devinit init_chipset_tc86c001(struct pci_dev *dev, const char *name) { int err = pci_request_region(dev, 5, name); if (err) printk(KERN_ERR "%s: system control regs already in use", name); return err; } 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 = "TC86C001", .init_chipset = init_chipset_tc86c001, .init_hwif = init_hwif_tc86c001, .port_ops = &tc86c001_port_ops, .dma_ops = &tc86c001_dma_ops, .host_flags = IDE_HFLAG_SINGLE | IDE_HFLAG_OFF_BOARD | IDE_HFLAG_ABUSE_SET_DMA_MODE, .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) { return ide_setup_pci_device(dev, &tc86c001_chipset); } 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 driver = { .name = "TC86C001", .id_table = tc86c001_pci_tbl, .probe = tc86c001_init_one }; static int __init tc86c001_ide_init(void) { return ide_pci_register_driver(&driver); } module_init(tc86c001_ide_init); MODULE_AUTHOR("MontaVista Software, Inc. <source@mvista.com>"); MODULE_DESCRIPTION("PCI driver module for TC86C001 IDE"); MODULE_LICENSE("GPL");