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linux-next/drivers/ide/pdc202xx_old.c
Sergei Shtylyov f693be4d8a pdc202xx_old: ignore "FIFO empty" bit in test_irq() method 
The driver takes into account not only the interrupt status bit but
also "FIFO empty" bit in its test_irq() method. This actually is a
superfluous check since for the DMA commands calling the
dma_test_irq() method further in the interrupt handler makes sure FIFO
is emptied.

Signed-off-by: Sergei Shtylyov <sshtylyov@ru.mvista.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
2010-04-22 19:11:24 -07:00

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/*
* Copyright (C) 1998-2002 Andre Hedrick <andre@linux-ide.org>
* Copyright (C) 2006-2007, 2009 MontaVista Software, Inc.
* Copyright (C) 2007-2010 Bartlomiej Zolnierkiewicz
*
* Portions Copyright (C) 1999 Promise Technology, Inc.
* Author: Frank Tiernan (frankt@promise.com)
* Released under terms of General Public License
*/
#include <linux/types.h>
#include <linux/module.h>
#include <linux/kernel.h>
#include <linux/delay.h>
#include <linux/blkdev.h>
#include <linux/pci.h>
#include <linux/init.h>
#include <linux/ide.h>
#include <asm/io.h>
#define DRV_NAME "pdc202xx_old"
static void pdc202xx_set_mode(ide_hwif_t *hwif, ide_drive_t *drive)
{
struct pci_dev *dev = to_pci_dev(hwif->dev);
u8 drive_pci = 0x60 + (drive->dn << 2);
const u8 speed = drive->dma_mode;
u8 AP = 0, BP = 0, CP = 0;
u8 TA = 0, TB = 0, TC = 0;
pci_read_config_byte(dev, drive_pci, &AP);
pci_read_config_byte(dev, drive_pci + 1, &BP);
pci_read_config_byte(dev, drive_pci + 2, &CP);
switch(speed) {
case XFER_UDMA_5:
case XFER_UDMA_4: TB = 0x20; TC = 0x01; break;
case XFER_UDMA_2: TB = 0x20; TC = 0x01; break;
case XFER_UDMA_3:
case XFER_UDMA_1: TB = 0x40; TC = 0x02; break;
case XFER_UDMA_0:
case XFER_MW_DMA_2: TB = 0x60; TC = 0x03; break;
case XFER_MW_DMA_1: TB = 0x60; TC = 0x04; break;
case XFER_MW_DMA_0: TB = 0xE0; TC = 0x0F; break;
case XFER_PIO_4: TA = 0x01; TB = 0x04; break;
case XFER_PIO_3: TA = 0x02; TB = 0x06; break;
case XFER_PIO_2: TA = 0x03; TB = 0x08; break;
case XFER_PIO_1: TA = 0x05; TB = 0x0C; break;
case XFER_PIO_0:
default: TA = 0x09; TB = 0x13; break;
}
if (speed < XFER_SW_DMA_0) {
/*
* preserve SYNC_INT / ERDDY_EN bits while clearing
* Prefetch_EN / IORDY_EN / PA[3:0] bits of register A
*/
AP &= ~0x3f;
if (ide_pio_need_iordy(drive, speed - XFER_PIO_0))
AP |= 0x20; /* set IORDY_EN bit */
if (drive->media == ide_disk)
AP |= 0x10; /* set Prefetch_EN bit */
/* clear PB[4:0] bits of register B */
BP &= ~0x1f;
pci_write_config_byte(dev, drive_pci, AP | TA);
pci_write_config_byte(dev, drive_pci + 1, BP | TB);
} else {
/* clear MB[2:0] bits of register B */
BP &= ~0xe0;
/* clear MC[3:0] bits of register C */
CP &= ~0x0f;
pci_write_config_byte(dev, drive_pci + 1, BP | TB);
pci_write_config_byte(dev, drive_pci + 2, CP | TC);
}
}
static void pdc202xx_set_pio_mode(ide_hwif_t *hwif, ide_drive_t *drive)
{
drive->dma_mode = drive->pio_mode;
pdc202xx_set_mode(hwif, drive);
}
static int pdc202xx_test_irq(ide_hwif_t *hwif)
{
struct pci_dev *dev = to_pci_dev(hwif->dev);
unsigned long high_16 = pci_resource_start(dev, 4);
u8 sc1d = inb(high_16 + 0x1d);
if (hwif->channel) {
/*
* bit 7: error, bit 6: interrupting,
* bit 5: FIFO full, bit 4: FIFO empty
*/
return (sc1d & 0x40) ? 1 : 0;
} else {
/*
* bit 3: error, bit 2: interrupting,
* bit 1: FIFO full, bit 0: FIFO empty
*/
return (sc1d & 0x04) ? 1 : 0;
}
}
static u8 pdc2026x_cable_detect(ide_hwif_t *hwif)
{
struct pci_dev *dev = to_pci_dev(hwif->dev);
u16 CIS, mask = hwif->channel ? (1 << 11) : (1 << 10);
pci_read_config_word(dev, 0x50, &CIS);
return (CIS & mask) ? ATA_CBL_PATA40 : ATA_CBL_PATA80;
}
/*
* Set the control register to use the 66MHz system
* clock for UDMA 3/4/5 mode operation when necessary.
*
* FIXME: this register is shared by both channels, some locking is needed
*
* It may also be possible to leave the 66MHz clock on
* and readjust the timing parameters.
*/
static void pdc_old_enable_66MHz_clock(ide_hwif_t *hwif)
{
unsigned long clock_reg = hwif->extra_base + 0x01;
u8 clock = inb(clock_reg);
outb(clock | (hwif->channel ? 0x08 : 0x02), clock_reg);
}
static void pdc_old_disable_66MHz_clock(ide_hwif_t *hwif)
{
unsigned long clock_reg = hwif->extra_base + 0x01;
u8 clock = inb(clock_reg);
outb(clock & ~(hwif->channel ? 0x08 : 0x02), clock_reg);
}
static void pdc2026x_init_hwif(ide_hwif_t *hwif)
{
pdc_old_disable_66MHz_clock(hwif);
}
static void pdc202xx_dma_start(ide_drive_t *drive)
{
if (drive->current_speed > XFER_UDMA_2)
pdc_old_enable_66MHz_clock(drive->hwif);
if (drive->media != ide_disk || (drive->dev_flags & IDE_DFLAG_LBA48)) {
ide_hwif_t *hwif = drive->hwif;
struct request *rq = hwif->rq;
unsigned long high_16 = hwif->extra_base - 16;
unsigned long atapi_reg = high_16 + (hwif->channel ? 0x24 : 0x20);
u32 word_count = 0;
u8 clock = inb(high_16 + 0x11);
outb(clock | (hwif->channel ? 0x08 : 0x02), high_16 + 0x11);
word_count = (blk_rq_sectors(rq) << 8);
word_count = (rq_data_dir(rq) == READ) ?
word_count | 0x05000000 :
word_count | 0x06000000;
outl(word_count, atapi_reg);
}
ide_dma_start(drive);
}
static int pdc202xx_dma_end(ide_drive_t *drive)
{
if (drive->media != ide_disk || (drive->dev_flags & IDE_DFLAG_LBA48)) {
ide_hwif_t *hwif = drive->hwif;
unsigned long high_16 = hwif->extra_base - 16;
unsigned long atapi_reg = high_16 + (hwif->channel ? 0x24 : 0x20);
u8 clock = 0;
outl(0, atapi_reg); /* zero out extra */
clock = inb(high_16 + 0x11);
outb(clock & ~(hwif->channel ? 0x08:0x02), high_16 + 0x11);
}
if (drive->current_speed > XFER_UDMA_2)
pdc_old_disable_66MHz_clock(drive->hwif);
return ide_dma_end(drive);
}
static int init_chipset_pdc202xx(struct pci_dev *dev)
{
unsigned long dmabase = pci_resource_start(dev, 4);
u8 udma_speed_flag = 0, primary_mode = 0, secondary_mode = 0;
if (dmabase == 0)
goto out;
udma_speed_flag = inb(dmabase | 0x1f);
primary_mode = inb(dmabase | 0x1a);
secondary_mode = inb(dmabase | 0x1b);
printk(KERN_INFO "%s: (U)DMA Burst Bit %sABLED " \
"Primary %s Mode " \
"Secondary %s Mode.\n", pci_name(dev),
(udma_speed_flag & 1) ? "EN" : "DIS",
(primary_mode & 1) ? "MASTER" : "PCI",
(secondary_mode & 1) ? "MASTER" : "PCI" );
if (!(udma_speed_flag & 1)) {
printk(KERN_INFO "%s: FORCING BURST BIT 0x%02x->0x%02x ",
pci_name(dev), udma_speed_flag,
(udma_speed_flag|1));
outb(udma_speed_flag | 1, dmabase | 0x1f);
printk("%sACTIVE\n", (inb(dmabase | 0x1f) & 1) ? "" : "IN");
}
out:
return 0;
}
static void __devinit pdc202ata4_fixup_irq(struct pci_dev *dev,
const char *name)
{
if ((dev->class >> 8) != PCI_CLASS_STORAGE_IDE) {
u8 irq = 0, irq2 = 0;
pci_read_config_byte(dev, PCI_INTERRUPT_LINE, &irq);
/* 0xbc */
pci_read_config_byte(dev, (PCI_INTERRUPT_LINE)|0x80, &irq2);
if (irq != irq2) {
pci_write_config_byte(dev,
(PCI_INTERRUPT_LINE)|0x80, irq); /* 0xbc */
printk(KERN_INFO "%s %s: PCI config space interrupt "
"mirror fixed\n", name, pci_name(dev));
}
}
}
#define IDE_HFLAGS_PDC202XX \
(IDE_HFLAG_ERROR_STOPS_FIFO | \
IDE_HFLAG_OFF_BOARD)
static const struct ide_port_ops pdc20246_port_ops = {
.set_pio_mode = pdc202xx_set_pio_mode,
.set_dma_mode = pdc202xx_set_mode,
.test_irq = pdc202xx_test_irq,
};
static const struct ide_port_ops pdc2026x_port_ops = {
.set_pio_mode = pdc202xx_set_pio_mode,
.set_dma_mode = pdc202xx_set_mode,
.test_irq = pdc202xx_test_irq,
.cable_detect = pdc2026x_cable_detect,
};
static const struct ide_dma_ops pdc2026x_dma_ops = {
.dma_host_set = ide_dma_host_set,
.dma_setup = ide_dma_setup,
.dma_start = pdc202xx_dma_start,
.dma_end = pdc202xx_dma_end,
.dma_test_irq = ide_dma_test_irq,
.dma_lost_irq = ide_dma_lost_irq,
.dma_timer_expiry = ide_dma_sff_timer_expiry,
.dma_sff_read_status = ide_dma_sff_read_status,
};
#define DECLARE_PDC2026X_DEV(udma, sectors) \
{ \
.name = DRV_NAME, \
.init_chipset = init_chipset_pdc202xx, \
.init_hwif = pdc2026x_init_hwif, \
.port_ops = &pdc2026x_port_ops, \
.dma_ops = &pdc2026x_dma_ops, \
.host_flags = IDE_HFLAGS_PDC202XX, \
.pio_mask = ATA_PIO4, \
.mwdma_mask = ATA_MWDMA2, \
.udma_mask = udma, \
.max_sectors = sectors, \
}
static const struct ide_port_info pdc202xx_chipsets[] __devinitdata = {
{ /* 0: PDC20246 */
.name = DRV_NAME,
.init_chipset = init_chipset_pdc202xx,
.port_ops = &pdc20246_port_ops,
.dma_ops = &sff_dma_ops,
.host_flags = IDE_HFLAGS_PDC202XX,
.pio_mask = ATA_PIO4,
.mwdma_mask = ATA_MWDMA2,
.udma_mask = ATA_UDMA2,
},
/* 1: PDC2026{2,3} */
DECLARE_PDC2026X_DEV(ATA_UDMA4, 0),
/* 2: PDC2026{5,7}: UDMA5, limit LBA48 requests to 256 sectors */
DECLARE_PDC2026X_DEV(ATA_UDMA5, 256),
};
/**
* pdc202xx_init_one - called when a PDC202xx is found
* @dev: the pdc202xx device
* @id: the matching pci id
*
* Called when the PCI registration layer (or the IDE initialization)
* finds a device matching our IDE device tables.
*/
static int __devinit pdc202xx_init_one(struct pci_dev *dev, const struct pci_device_id *id)
{
const struct ide_port_info *d;
u8 idx = id->driver_data;
d = &pdc202xx_chipsets[idx];
if (idx < 2)
pdc202ata4_fixup_irq(dev, d->name);
if (dev->vendor == PCI_DEVICE_ID_PROMISE_20265) {
struct pci_dev *bridge = dev->bus->self;
if (bridge &&
bridge->vendor == PCI_VENDOR_ID_INTEL &&
(bridge->device == PCI_DEVICE_ID_INTEL_I960 ||
bridge->device == PCI_DEVICE_ID_INTEL_I960RM)) {
printk(KERN_INFO DRV_NAME " %s: skipping Promise "
"PDC20265 attached to I2O RAID controller\n",
pci_name(dev));
return -ENODEV;
}
}
return ide_pci_init_one(dev, d, NULL);
}
static const struct pci_device_id pdc202xx_pci_tbl[] = {
{ PCI_VDEVICE(PROMISE, PCI_DEVICE_ID_PROMISE_20246), 0 },
{ PCI_VDEVICE(PROMISE, PCI_DEVICE_ID_PROMISE_20262), 1 },
{ PCI_VDEVICE(PROMISE, PCI_DEVICE_ID_PROMISE_20263), 1 },
{ PCI_VDEVICE(PROMISE, PCI_DEVICE_ID_PROMISE_20265), 2 },
{ PCI_VDEVICE(PROMISE, PCI_DEVICE_ID_PROMISE_20267), 2 },
{ 0, },
};
MODULE_DEVICE_TABLE(pci, pdc202xx_pci_tbl);
static struct pci_driver pdc202xx_pci_driver = {
.name = "Promise_Old_IDE",
.id_table = pdc202xx_pci_tbl,
.probe = pdc202xx_init_one,
.remove = ide_pci_remove,
.suspend = ide_pci_suspend,
.resume = ide_pci_resume,
};
static int __init pdc202xx_ide_init(void)
{
return ide_pci_register_driver(&pdc202xx_pci_driver);
}
static void __exit pdc202xx_ide_exit(void)
{
pci_unregister_driver(&pdc202xx_pci_driver);
}
module_init(pdc202xx_ide_init);
module_exit(pdc202xx_ide_exit);
MODULE_AUTHOR("Andre Hedrick, Frank Tiernan, Bartlomiej Zolnierkiewicz");
MODULE_DESCRIPTION("PCI driver module for older Promise IDE");
MODULE_LICENSE("GPL");
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