diff options
Diffstat (limited to 'kernel/drivers/ide/sl82c105.c')
| -rw-r--r-- | kernel/drivers/ide/sl82c105.c | 365 |
1 files changed, 365 insertions, 0 deletions
diff --git a/kernel/drivers/ide/sl82c105.c b/kernel/drivers/ide/sl82c105.c new file mode 100644 index 000000000..8755df333 --- /dev/null +++ b/kernel/drivers/ide/sl82c105.c @@ -0,0 +1,365 @@ +/* + * 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) 2006-2007,2009 MontaVista Software, Inc. <source@mvista.com> + * Copyright (C) 2007 Bartlomiej Zolnierkiewicz + */ + +#include <linux/types.h> +#include <linux/module.h> +#include <linux/kernel.h> +#include <linux/pci.h> +#include <linux/ide.h> + +#include <asm/io.h> + +#define DRV_NAME "sl82c105" + +/* + * 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) +{ + struct ide_timing *t = ide_timing_find_mode(XFER_PIO_0 + pio); + unsigned int cmd_on, cmd_off; + u8 iordy = 0; + + cmd_on = (t->active + 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 (ide_pio_need_iordy(drive, pio)) + iordy = 0x40; + + return (cmd_on - 1) << 8 | (cmd_off - 1) | iordy; +} + +/* + * Configure the chipset for PIO mode. + */ +static void sl82c105_set_pio_mode(ide_hwif_t *hwif, ide_drive_t *drive) +{ + struct pci_dev *dev = to_pci_dev(hwif->dev); + unsigned long timings = (unsigned long)ide_get_drivedata(drive); + int reg = 0x44 + drive->dn * 4; + u16 drv_ctrl; + const u8 pio = drive->pio_mode - XFER_PIO_0; + + drv_ctrl = get_pio_timings(drive, pio); + + /* + * Store the PIO timings so that we can restore them + * in case DMA will be turned off... + */ + timings &= 0xffff0000; + timings |= drv_ctrl; + ide_set_drivedata(drive, (void *)timings); + + 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_hwif_t *hwif, ide_drive_t *drive) +{ + static u16 mwdma_timings[] = {0x0707, 0x0201, 0x0200}; + unsigned long timings = (unsigned long)ide_get_drivedata(drive); + u16 drv_ctrl; + const u8 speed = drive->dma_mode; + + 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... + */ + timings &= 0x0000ffff; + timings |= (unsigned long)drv_ctrl << 16; + ide_set_drivedata(drive, (void *)timings); +} + +static int sl82c105_test_irq(ide_hwif_t *hwif) +{ + struct pci_dev *dev = to_pci_dev(hwif->dev); + u32 val, mask = hwif->channel ? CTRL_IDE_IRQB : CTRL_IDE_IRQA; + + pci_read_config_dword(dev, 0x40, &val); + + return (val & mask) ? 1 : 0; +} + +/* + * 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 = drive->hwif; + struct pci_dev *dev = to_pci_dev(hwif->dev); + u32 val, mask = hwif->channel ? CTRL_IDE_IRQB : CTRL_IDE_IRQA; + u8 dma_cmd; + + printk(KERN_WARNING "sl82c105: lost IRQ, resetting host\n"); + + /* + * Check the raw interrupt from the drive. + */ + pci_read_config_dword(dev, 0x40, &val); + if (val & mask) + printk(KERN_INFO "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_base + ATA_DMA_CMD); + if (dma_cmd & 1) { + outb(dma_cmd & ~1, hwif->dma_base + ATA_DMA_CMD); + printk(KERN_INFO "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 = drive->hwif; + struct pci_dev *dev = to_pci_dev(hwif->dev); + int reg = 0x44 + drive->dn * 4; + + pci_write_config_word(dev, reg, + (unsigned long)ide_get_drivedata(drive) >> 16); + + sl82c105_reset_host(dev); + ide_dma_start(drive); +} + +static void sl82c105_dma_clear(ide_drive_t *drive) +{ + struct pci_dev *dev = to_pci_dev(drive->hwif->dev); + + sl82c105_reset_host(dev); +} + +static int sl82c105_dma_end(ide_drive_t *drive) +{ + struct pci_dev *dev = to_pci_dev(drive->hwif->dev); + int reg = 0x44 + drive->dn * 4; + int ret = ide_dma_end(drive); + + pci_write_config_word(dev, reg, + (unsigned long)ide_get_drivedata(drive)); + + return ret; +} + +/* + * ATA reset will clear the 16 bits mode in the control + * register, we need to reprogram it + */ +static void sl82c105_resetproc(ide_drive_t *drive) +{ + struct pci_dev *dev = to_pci_dev(drive->hwif->dev); + u32 val; + + pci_read_config_dword(dev, 0x40, &val); + val |= (CTRL_P1F16 | CTRL_P0F16); + pci_write_config_dword(dev, 0x40, val); +} + +/* + * Return the revision of the Winbond bridge + * which this function is part of. + */ +static u8 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 int init_chipset_sl82c105(struct pci_dev *dev) +{ + u32 val; + + pci_read_config_dword(dev, 0x40, &val); + val |= CTRL_P0EN | CTRL_P0F16 | CTRL_P1F16; + pci_write_config_dword(dev, 0x40, val); + + return 0; +} + +static const struct ide_port_ops sl82c105_port_ops = { + .set_pio_mode = sl82c105_set_pio_mode, + .set_dma_mode = sl82c105_set_dma_mode, + .resetproc = sl82c105_resetproc, + .test_irq = sl82c105_test_irq, +}; + +static const struct ide_dma_ops sl82c105_dma_ops = { + .dma_host_set = ide_dma_host_set, + .dma_setup = ide_dma_setup, + .dma_start = sl82c105_dma_start, + .dma_end = sl82c105_dma_end, + .dma_test_irq = ide_dma_test_irq, + .dma_lost_irq = sl82c105_dma_lost_irq, + .dma_timer_expiry = ide_dma_sff_timer_expiry, + .dma_clear = sl82c105_dma_clear, + .dma_sff_read_status = ide_dma_sff_read_status, +}; + +static const struct ide_port_info sl82c105_chipset = { + .name = DRV_NAME, + .init_chipset = init_chipset_sl82c105, + .enablebits = {{0x40,0x01,0x01}, {0x40,0x10,0x10}}, + .port_ops = &sl82c105_port_ops, + .dma_ops = &sl82c105_dma_ops, + .host_flags = IDE_HFLAG_IO_32BIT | + IDE_HFLAG_UNMASK_IRQS | + IDE_HFLAG_SERIALIZE_DMA | + IDE_HFLAG_NO_AUTODMA, + .pio_mask = ATA_PIO5, + .mwdma_mask = ATA_MWDMA2, +}; + +static int sl82c105_init_one(struct pci_dev *dev, const struct pci_device_id *id) +{ + struct ide_port_info d = sl82c105_chipset; + u8 rev = sl82c105_bridge_revision(dev); + + if (rev <= 5) { + /* + * Never ever EVER under any circumstances enable + * DMA when the bridge is this old. + */ + printk(KERN_INFO DRV_NAME ": Winbond W83C553 bridge " + "revision %d, BM-DMA disabled\n", rev); + d.dma_ops = NULL; + d.mwdma_mask = 0; + d.host_flags &= ~IDE_HFLAG_SERIALIZE_DMA; + } + + return ide_pci_init_one(dev, &d, NULL); +} + +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 sl82c105_pci_driver = { + .name = "W82C105_IDE", + .id_table = sl82c105_pci_tbl, + .probe = sl82c105_init_one, + .remove = ide_pci_remove, + .suspend = ide_pci_suspend, + .resume = ide_pci_resume, +}; + +static int __init sl82c105_ide_init(void) +{ + return ide_pci_register_driver(&sl82c105_pci_driver); +} + +static void __exit sl82c105_ide_exit(void) +{ + pci_unregister_driver(&sl82c105_pci_driver); +} + +module_init(sl82c105_ide_init); +module_exit(sl82c105_ide_exit); + +MODULE_DESCRIPTION("PCI driver module for W82C105 IDE"); +MODULE_LICENSE("GPL"); |