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alistair23-linux/drivers/ide/pci/sl82c105.c

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/*
* 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. <source@mvista.com>
*/
#include <linux/types.h>
#include <linux/module.h>
#include <linux/kernel.h>
#include <linux/timer.h>
#include <linux/mm.h>
#include <linux/ioport.h>
#include <linux/interrupt.h>
#include <linux/blkdev.h>
#include <linux/hdreg.h>
#include <linux/pci.h>
#include <linux/ide.h>
#include <asm/io.h>
#include <asm/dma.h>
#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);
drv_ctrl = get_pio_timings(&p);
/*
* 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), p.cycle_time, drv_ctrl);
return pio;
}
/*
* Configure the drive and chipset for a new transfer speed.
*/
static int sl82c105_tune_chipset(ide_drive_t *drive, 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)));
speed = ide_rate_filter(drive, 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;
case XFER_PIO_5:
case XFER_PIO_4:
case XFER_PIO_3:
case XFER_PIO_2:
case XFER_PIO_1:
case XFER_PIO_0:
(void) sl82c105_tune_pio(drive, speed - XFER_PIO_0);
break;
default:
return -1;
}
return ide_config_drive_speed(drive, speed);
}
/*
* Check to see if the drive and chipset are capable of DMA mode.
*/
static int sl82c105_ide_dma_check(ide_drive_t *drive)
{
DBG(("sl82c105_ide_dma_check(drive:%s)\n", drive->name));
if (ide_tune_dma(drive))
return 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 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);
}
/*
* 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;
/*
* 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->tuneproc = &sl82c105_tune_drive;
hwif->speedproc = &sl82c105_tune_chipset;
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;
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->atapi_dma = 1;
hwif->mwdma_mask = 0x07;
hwif->ide_dma_check = &sl82c105_ide_dma_check;
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 (!noautodma)
hwif->autodma = 1;
hwif->drives[0].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");
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