/* * 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_drive_t *drive, u8 pio) { unsigned int cmd_on, cmd_off; u8 iordy = 0; cmd_on = (ide_pio_timings[pio].active_time + 29) / 30; cmd_off = (ide_pio_cycle_time(drive, pio) - 30 * cmd_on + 29) / 30; if (cmd_on == 0) cmd_on = 1; if (cmd_off == 0) cmd_off = 1; if (pio > 2 || ide_dev_has_iordy(drive->id)) iordy = 0x40; return (cmd_on - 1) << 8 | (cmd_off - 1) | iordy; } /* * Configure the chipset for PIO mode. */ static void sl82c105_set_pio_mode(ide_drive_t *drive, const u8 pio) { struct pci_dev *dev = HWIF(drive)->pci_dev; int reg = 0x44 + drive->dn * 4; u16 drv_ctrl; drv_ctrl = get_pio_timings(drive, pio); /* * Store the PIO timings so that we can restore them * in case DMA will be turned off... */ drive->drive_data &= 0xffff0000; drive->drive_data |= drv_ctrl; 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), ide_pio_cycle_time(drive, pio), drv_ctrl); } /* * Configure the chipset for DMA mode. */ static void sl82c105_set_dma_mode(ide_drive_t *drive, const u8 speed) { static u16 mwdma_timings[] = {0x0707, 0x0201, 0x0200}; u16 drv_ctrl; DBG(("sl82c105_tune_chipset(drive:%s, speed:%s)\n", drive->name, ide_xfer_verbose(speed))); switch (speed) { case XFER_MW_DMA_2: case XFER_MW_DMA_1: case XFER_MW_DMA_0: drv_ctrl = mwdma_timings[speed - XFER_MW_DMA_0]; /* * Store the DMA timings so that we can actually program * them when DMA will be turned on... */ drive->drive_data &= 0x0000ffff; drive->drive_data |= (unsigned long)drv_ctrl << 16; /* * If we are already using DMA, we just reprogram * the drive control register. */ if (drive->using_dma) { struct pci_dev *dev = HWIF(drive)->pci_dev; int reg = 0x44 + drive->dn * 4; pci_write_config_word(dev, reg, drv_ctrl); } break; default: return; } } /* * 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 void sl82c105_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; u8 dma_cmd; 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. */ dma_cmd = inb(hwif->dma_command); if (dma_cmd & 1) { outb(dma_cmd & ~1, hwif->dma_command); printk("sl82c105: DMA was enabled\n"); } sl82c105_reset_host(dev); } /* * 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_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 void sl82c105_dma_timeout(ide_drive_t *drive) { DBG(("sl82c105_dma_timeout(drive:%s)\n", drive->name)); sl82c105_reset_host(HWIF(drive)->pci_dev); ide_dma_timeout(drive); } static int sl82c105_ide_dma_on(ide_drive_t *drive) { struct pci_dev *dev = HWIF(drive)->pci_dev; int rc, reg = 0x44 + drive->dn * 4; DBG(("sl82c105_ide_dma_on(drive:%s)\n", drive->name)); rc = __ide_dma_on(drive); if (rc == 0) { pci_write_config_word(dev, reg, drive->drive_data >> 16); printk(KERN_INFO "%s: DMA enabled\n", drive->name); } return rc; } 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); } /* * 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; /* * The bridge should be part of the same device, but function 0. */ bridge = pci_get_bus_and_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) { pci_dev_put(bridge); return -1; } /* * We need to find function 0's revision, not function 1 */ pci_dev_put(bridge); return bridge->revision; } /* * 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 IDE channel */ static void __devinit init_hwif_sl82c105(ide_hwif_t *hwif) { unsigned int rev; DBG(("init_hwif_sl82c105(hwif: ide%d)\n", hwif->index)); hwif->set_pio_mode = &sl82c105_set_pio_mode; hwif->set_dma_mode = &sl82c105_set_dma_mode; hwif->selectproc = &sl82c105_selectproc; hwif->resetproc = &sl82c105_resetproc; 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 W83C553 bridge revision %d, " "BM-DMA disabled\n", hwif->name, rev); return; } hwif->mwdma_mask = ATA_MWDMA2; hwif->ide_dma_on = &sl82c105_ide_dma_on; hwif->dma_off_quietly = &sl82c105_dma_off_quietly; hwif->dma_lost_irq = &sl82c105_dma_lost_irq; hwif->dma_start = &sl82c105_dma_start; hwif->dma_timeout = &sl82c105_dma_timeout; 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, .enablebits = {{0x40,0x01,0x01}, {0x40,0x10,0x10}}, .host_flags = IDE_HFLAG_IO_32BIT | IDE_HFLAG_UNMASK_IRQS | IDE_HFLAG_NO_AUTODMA | IDE_HFLAG_BOOTABLE, .pio_mask = ATA_PIO5, }; 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 const struct pci_device_id sl82c105_pci_tbl[] = { { PCI_VDEVICE(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");