/* * linux/drivers/ide/pci/sl82c105.c * * SL82C105/Winbond 553 IDE driver * * Maintainer unknown. * * Drive tuning added from Rebel.com's kernel sources * -- Russell King (15/11/98) linux@arm.linux.org.uk * * Merge in Russell's HW workarounds, fix various problems * with the timing registers setup. * -- Benjamin Herrenschmidt (01/11/03) benh@kernel.crashing.org * * Copyright (C) 2006-2007 MontaVista Software, Inc. */ #include #include #include #include #include #include #include #include #include #include #include #include #include #undef DEBUG #ifdef DEBUG #define DBG(arg) printk arg #else #define DBG(fmt,...) #endif /* * SL82C105 PCI config register 0x40 bits. */ #define CTRL_IDE_IRQB (1 << 30) #define CTRL_IDE_IRQA (1 << 28) #define CTRL_LEGIRQ (1 << 11) #define CTRL_P1F16 (1 << 5) #define CTRL_P1EN (1 << 4) #define CTRL_P0F16 (1 << 1) #define CTRL_P0EN (1 << 0) /* * Convert a PIO mode and cycle time to the required on/off times * for the interface. This has protection against runaway timings. */ static unsigned int get_pio_timings(ide_pio_data_t *p) { unsigned int cmd_on, cmd_off; cmd_on = (ide_pio_timings[p->pio_mode].active_time + 29) / 30; cmd_off = (p->cycle_time - 30 * cmd_on + 29) / 30; if (cmd_on == 0) cmd_on = 1; if (cmd_off == 0) cmd_off = 1; return (cmd_on - 1) << 8 | (cmd_off - 1) | (p->use_iordy ? 0x40 : 0x00); } /* * Configure the chipset for PIO mode. */ static u8 sl82c105_tune_pio(ide_drive_t *drive, u8 pio) { struct pci_dev *dev = HWIF(drive)->pci_dev; int reg = 0x44 + drive->dn * 4; ide_pio_data_t p; u16 drv_ctrl; DBG(("sl82c105_tune_pio(drive:%s, pio:%u)\n", drive->name, pio)); pio = ide_get_best_pio_mode(drive, pio, 5, &p); drive->drive_data = drv_ctrl = get_pio_timings(&p); if (!drive->using_dma) { /* * If we are actually using MW DMA, then we can not * reprogram the interface drive control register. */ pci_write_config_word(dev, reg, drv_ctrl); pci_read_config_word (dev, reg, &drv_ctrl); } printk(KERN_DEBUG "%s: selected %s (%dns) (%04X)\n", drive->name, ide_xfer_verbose(pio + XFER_PIO_0), p.cycle_time, drv_ctrl); return pio; } /* * Configure the drive and the chipset for DMA */ static int config_for_dma (ide_drive_t *drive) { ide_hwif_t *hwif = HWIF(drive); struct pci_dev *dev = hwif->pci_dev; unsigned int reg; DBG(("config_for_dma(drive:%s)\n", drive->name)); reg = (hwif->channel ? 0x4c : 0x44) + (drive->select.b.unit ? 4 : 0); if (ide_config_drive_speed(drive, XFER_MW_DMA_2) != 0) return 1; pci_write_config_word(dev, reg, 0x0240); return 0; } /* * Check to see if the drive and * chipset is capable of DMA mode */ static int sl82c105_check_drive (ide_drive_t *drive) { ide_hwif_t *hwif = HWIF(drive); DBG(("sl82c105_check_drive(drive:%s)\n", drive->name)); do { struct hd_driveid *id = drive->id; if (!drive->autodma) break; if (!id || !(id->capability & 1)) break; /* Consult the list of known "bad" drives */ if (__ide_dma_bad_drive(drive)) break; if (id->field_valid & 2) { if ((id->dma_mword & hwif->mwdma_mask) || (id->dma_1word & hwif->swdma_mask)) return 0; } if (__ide_dma_good_drive(drive) && id->eide_dma_time < 150) return 0; } while (0); return -1; } /* * The SL82C105 holds off all IDE interrupts while in DMA mode until * all DMA activity is completed. Sometimes this causes problems (eg, * when the drive wants to report an error condition). * * 0x7e is a "chip testing" register. Bit 2 resets the DMA controller * state machine. We need to kick this to work around various bugs. */ static inline void sl82c105_reset_host(struct pci_dev *dev) { u16 val; pci_read_config_word(dev, 0x7e, &val); pci_write_config_word(dev, 0x7e, val | (1 << 2)); pci_write_config_word(dev, 0x7e, val & ~(1 << 2)); } /* * If we get an IRQ timeout, it might be that the DMA state machine * got confused. Fix from Todd Inglett. Details from Winbond. * * This function is called when the IDE timer expires, the drive * indicates that it is READY, and we were waiting for DMA to complete. */ static int sl82c105_ide_dma_lost_irq(ide_drive_t *drive) { ide_hwif_t *hwif = HWIF(drive); struct pci_dev *dev = hwif->pci_dev; u32 val, mask = hwif->channel ? CTRL_IDE_IRQB : CTRL_IDE_IRQA; unsigned long dma_base = hwif->dma_base; printk("sl82c105: lost IRQ: resetting host\n"); /* * Check the raw interrupt from the drive. */ pci_read_config_dword(dev, 0x40, &val); if (val & mask) printk("sl82c105: drive was requesting IRQ, but host lost it\n"); /* * Was DMA enabled? If so, disable it - we're resetting the * host. The IDE layer will be handling the drive for us. */ val = inb(dma_base); if (val & 1) { outb(val & ~1, dma_base); printk("sl82c105: DMA was enabled\n"); } sl82c105_reset_host(dev); /* ide_dmaproc would return 1, so we do as well */ return 1; } /* * ATAPI devices can cause the SL82C105 DMA state machine to go gaga. * Winbond recommend that the DMA state machine is reset prior to * setting the bus master DMA enable bit. * * The generic IDE core will have disabled the BMEN bit before this * function is called. */ static void sl82c105_ide_dma_start(ide_drive_t *drive) { ide_hwif_t *hwif = HWIF(drive); struct pci_dev *dev = hwif->pci_dev; sl82c105_reset_host(dev); ide_dma_start(drive); } static int sl82c105_ide_dma_timeout(ide_drive_t *drive) { ide_hwif_t *hwif = HWIF(drive); struct pci_dev *dev = hwif->pci_dev; DBG(("sl82c105_ide_dma_timeout(drive:%s)\n", drive->name)); sl82c105_reset_host(dev); return __ide_dma_timeout(drive); } static int sl82c105_ide_dma_on (ide_drive_t *drive) { DBG(("sl82c105_ide_dma_on(drive:%s)\n", drive->name)); if (config_for_dma(drive)) return 1; printk(KERN_INFO "%s: DMA enabled\n", drive->name); return __ide_dma_on(drive); } static void sl82c105_dma_off_quietly(ide_drive_t *drive) { struct pci_dev *dev = HWIF(drive)->pci_dev; int reg = 0x44 + drive->dn * 4; DBG(("sl82c105_dma_off_quietly(drive:%s)\n", drive->name)); pci_write_config_word(dev, reg, drive->drive_data); ide_dma_off_quietly(drive); } /* * Ok, that is nasty, but we must make sure the DMA timings * won't be used for a PIO access. The solution here is * to make sure the 16 bits mode is diabled on the channel * when DMA is enabled, thus causing the chip to use PIO0 * timings for those operations. */ static void sl82c105_selectproc(ide_drive_t *drive) { ide_hwif_t *hwif = HWIF(drive); struct pci_dev *dev = hwif->pci_dev; u32 val, old, mask; //DBG(("sl82c105_selectproc(drive:%s)\n", drive->name)); mask = hwif->channel ? CTRL_P1F16 : CTRL_P0F16; old = val = (u32)pci_get_drvdata(dev); if (drive->using_dma) val &= ~mask; else val |= mask; if (old != val) { pci_write_config_dword(dev, 0x40, val); pci_set_drvdata(dev, (void *)val); } } /* * ATA reset will clear the 16 bits mode in the control * register, we need to update our cache */ static void sl82c105_resetproc(ide_drive_t *drive) { struct pci_dev *dev = HWIF(drive)->pci_dev; u32 val; DBG(("sl82c105_resetproc(drive:%s)\n", drive->name)); pci_read_config_dword(dev, 0x40, &val); pci_set_drvdata(dev, (void *)val); } /* * We only deal with PIO mode here - DMA mode 'using_dma' is not * initialised at the point that this function is called. */ static void sl82c105_tune_drive(ide_drive_t *drive, u8 pio) { DBG(("sl82c105_tune_drive(drive:%s, pio:%u)\n", drive->name, pio)); pio = sl82c105_tune_pio(drive, pio); (void) ide_config_drive_speed(drive, XFER_PIO_0 + pio); } /* * Return the revision of the Winbond bridge * which this function is part of. */ static unsigned int sl82c105_bridge_revision(struct pci_dev *dev) { struct pci_dev *bridge; u8 rev; /* * The bridge should be part of the same device, but function 0. */ bridge = pci_find_slot(dev->bus->number, PCI_DEVFN(PCI_SLOT(dev->devfn), 0)); if (!bridge) return -1; /* * Make sure it is a Winbond 553 and is an ISA bridge. */ if (bridge->vendor != PCI_VENDOR_ID_WINBOND || bridge->device != PCI_DEVICE_ID_WINBOND_83C553 || bridge->class >> 8 != PCI_CLASS_BRIDGE_ISA) return -1; /* * We need to find function 0's revision, not function 1 */ pci_read_config_byte(bridge, PCI_REVISION_ID, &rev); return rev; } /* * Enable the PCI device * * --BenH: It's arch fixup code that should enable channels that * have not been enabled by firmware. I decided we can still enable * channel 0 here at least, but channel 1 has to be enabled by * firmware or arch code. We still set both to 16 bits mode. */ static unsigned int __devinit init_chipset_sl82c105(struct pci_dev *dev, const char *msg) { u32 val; DBG(("init_chipset_sl82c105()\n")); pci_read_config_dword(dev, 0x40, &val); val |= CTRL_P0EN | CTRL_P0F16 | CTRL_P1F16; pci_write_config_dword(dev, 0x40, val); pci_set_drvdata(dev, (void *)val); return dev->irq; } /* * Initialise the chip */ static void __devinit init_hwif_sl82c105(ide_hwif_t *hwif) { unsigned int rev; DBG(("init_hwif_sl82c105(hwif: ide%d)\n", hwif->index)); hwif->tuneproc = &sl82c105_tune_drive; hwif->selectproc = &sl82c105_selectproc; hwif->resetproc = &sl82c105_resetproc; /* * We support 32-bit I/O on this interface, and * it doesn't have problems with interrupts. */ hwif->drives[0].io_32bit = hwif->drives[1].io_32bit = 1; hwif->drives[0].unmask = hwif->drives[1].unmask = 1; /* * We always autotune PIO, this is done before DMA is checked, * so there's no risk of accidentally disabling DMA */ hwif->drives[0].autotune = hwif->drives[1].autotune = 1; hwif->atapi_dma = 0; hwif->mwdma_mask = 0; hwif->swdma_mask = 0; hwif->autodma = 0; if (!hwif->dma_base) return; rev = sl82c105_bridge_revision(hwif->pci_dev); if (rev <= 5) { /* * Never ever EVER under any circumstances enable * DMA when the bridge is this old. */ printk(" %s: Winbond 553 bridge revision %d, BM-DMA disabled\n", hwif->name, rev); } else { hwif->atapi_dma = 1; hwif->mwdma_mask = 0x04; hwif->ide_dma_check = &sl82c105_check_drive; hwif->ide_dma_on = &sl82c105_ide_dma_on; hwif->dma_off_quietly = &sl82c105_dma_off_quietly; hwif->ide_dma_lostirq = &sl82c105_ide_dma_lost_irq; hwif->dma_start = &sl82c105_ide_dma_start; hwif->ide_dma_timeout = &sl82c105_ide_dma_timeout; if (!noautodma) hwif->autodma = 1; hwif->drives[0].autodma = hwif->autodma; hwif->drives[1].autodma = hwif->autodma; if (hwif->mate) hwif->serialized = hwif->mate->serialized = 1; } } static ide_pci_device_t sl82c105_chipset __devinitdata = { .name = "W82C105", .init_chipset = init_chipset_sl82c105, .init_hwif = init_hwif_sl82c105, .channels = 2, .autodma = NOAUTODMA, .enablebits = {{0x40,0x01,0x01}, {0x40,0x10,0x10}}, .bootable = ON_BOARD, }; static int __devinit sl82c105_init_one(struct pci_dev *dev, const struct pci_device_id *id) { return ide_setup_pci_device(dev, &sl82c105_chipset); } static struct pci_device_id sl82c105_pci_tbl[] = { { PCI_DEVICE(PCI_VENDOR_ID_WINBOND, PCI_DEVICE_ID_WINBOND_82C105), 0}, { 0, }, }; MODULE_DEVICE_TABLE(pci, sl82c105_pci_tbl); static struct pci_driver driver = { .name = "W82C105_IDE", .id_table = sl82c105_pci_tbl, .probe = sl82c105_init_one, }; static int __init sl82c105_ide_init(void) { return ide_pci_register_driver(&driver); } module_init(sl82c105_ide_init); MODULE_DESCRIPTION("PCI driver module for W82C105 IDE"); MODULE_LICENSE("GPL");