/*
* 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
*/
#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 run-away
* timings.
*/
static unsigned int get_timing_sl82c105(ide_pio_data_t *p)
{
unsigned int cmd_on;
unsigned int 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 > 32)
cmd_on = 32;
if (cmd_on == 0)
cmd_on = 1;
if (cmd_off > 32)
cmd_off = 32;
if (cmd_off == 0)
cmd_off = 1;
return (cmd_on - 1) << 8 | (cmd_off - 1) | (p->use_iordy ? 0x40 : 0x00);
}
/*
* Configure the drive and chipset for PIO
*/
static void config_for_pio(ide_drive_t *drive, int pio, int report, int chipset_only)
{
ide_hwif_t *hwif = HWIF(drive);
struct pci_dev *dev = hwif->pci_dev;
ide_pio_data_t p;
u16 drv_ctrl = 0x909;
unsigned int xfer_mode, reg;
DBG(("config_for_pio(drive:%s, pio:%d, report:%d, chipset_only:%d)\n",
drive->name, pio, report, chipset_only));
reg = (hwif->channel ? 0x4c : 0x44) + (drive->select.b.unit ? 4 : 0);
pio = ide_get_best_pio_mode(drive, pio, 5, &p);
xfer_mode = XFER_PIO_0 + pio;
if (chipset_only || ide_config_drive_speed(drive, xfer_mode) == 0) {
drv_ctrl = get_timing_sl82c105(&p);
drive->pio_speed = xfer_mode;
} else
drive->pio_speed = XFER_PIO_0;
if (drive->using_dma == 0) {
/*
* 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);
if (report) {
printk("%s: selected %s (%dns) (%04X)\n", drive->name,
ide_xfer_verbose(xfer_mode), p.cycle_time, drv_ctrl);
}
}
}
/*
* 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 hwif->ide_dma_on(drive);
}
if (__ide_dma_good_drive(drive))
return hwif->ide_dma_on(drive);
} while (0);
return hwif->ide_dma_off_quietly(drive);
}
/*
* 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 = hwif->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)) {
config_for_pio(drive, 4, 0, 0);
return HWIF(drive)->ide_dma_off_quietly(drive);
}
printk(KERN_INFO "%s: DMA enabled\n", drive->name);
return __ide_dma_on(drive);
}
static int sl82c105_ide_dma_off_quietly (ide_drive_t *drive)
{
u8 speed = XFER_PIO_0;
int rc;
DBG(("sl82c105_ide_dma_off_quietly(drive:%s)\n", drive->name));
rc = __ide_dma_off_quietly(drive);
if (drive->pio_speed)
speed = drive->pio_speed - XFER_PIO_0;
config_for_pio(drive, speed, 0, 1);
drive->current_speed = drive->pio_speed;
return rc;
}
/*
* 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 tune_sl82c105(ide_drive_t *drive, u8 pio)
{
DBG(("tune_sl82c105(drive:%s)\n", drive->name));
config_for_pio(drive, pio, 1, 0);
/*
* We support 32-bit I/O on this interface, and it
* doesn't have problems with interrupts.
*/
drive->io_32bit = 1;
drive->unmask = 1;
}
/*
* 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;
u8 dma_state;
DBG(("init_hwif_sl82c105(hwif: ide%d)\n", hwif->index));
hwif->tuneproc = tune_sl82c105;
hwif->selectproc = sl82c105_selectproc;
hwif->resetproc = sl82c105_resetproc;
/*
* Default to PIO 0 for fallback unless tuned otherwise.
* We always autotune PIO, this is done before DMA is checked,
* so there's no risk of accidentally disabling DMA
*/
hwif->drives[0].pio_speed = XFER_PIO_0;
hwif->drives[0].autotune = 1;
hwif->drives[1].pio_speed = XFER_PIO_0;
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;
dma_state = hwif->INB(hwif->dma_base + 2) & ~0x60;
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 {
dma_state |= 0x60;
hwif->atapi_dma = 1;
hwif->mwdma_mask = 0x07;
hwif->swdma_mask = 0x07;
hwif->ide_dma_check = &sl82c105_check_drive;
hwif->ide_dma_on = &sl82c105_ide_dma_on;
hwif->ide_dma_off_quietly = &sl82c105_ide_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;
}
hwif->OUTB(dma_state, hwif->dma_base + 2);
}
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 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");
