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linux-2.6/drivers/ide/amd74xx.c
Bartlomiej Zolnierkiewicz 6636487e8d amd74xx: workaround unreliable AltStatus register for nVidia controllers 
It seems that on some nVidia controllers using AltStatus register
can be unreliable so default to Status register if the PCI device
is in Compatibility Mode.  In order to achieve this:

* Add ide_pci_is_in_compatibility_mode() inline helper to <linux/ide.h>.

* Add IDE_HFLAG_BROKEN_ALTSTATUS host flag and set it in amd74xx host
  driver for nVidia controllers in Compatibility Mode.

* Teach actual_try_to_identify() and drive_is_ready() about the new flag.

This fixes the regression caused by removal of CONFIG_IDEPCI_SHARE_IRQ
config option in 2.6.25 and using AltStatus register unconditionally when
available (kernel.org bugs #11659 and #10216).

[ Moreover for CONFIG_IDEPCI_SHARE_IRQ=y (which is what most people
  and distributions use) it never worked correctly. ]

Thanks to Remy LABENE and Lars Winterfeld for help with debugging the problem.

More info at:
http://bugzilla.kernel.org/show_bug.cgi?id=11659
http://bugzilla.kernel.org/show_bug.cgi?id=10216

Reported-by: Remy LABENE <remy.labene@free.fr>
Tested-by: Remy LABENE <remy.labene@free.fr>
Tested-by: Lars Winterfeld <lars.winterfeld@tu-ilmenau.de>
Acked-by: Borislav Petkov <petkovbb@gmail.com>
Signed-off-by: Bartlomiej Zolnierkiewicz <bzolnier@gmail.com>
2008-12-02 20:40:03 +01:00

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/*
* AMD 755/756/766/8111 and nVidia nForce/2/2s/3/3s/CK804/MCP04
* IDE driver for Linux.
*
* Copyright (c) 2000-2002 Vojtech Pavlik
* Copyright (c) 2007-2008 Bartlomiej Zolnierkiewicz
*
* Based on the work of:
* Andre Hedrick
*/
/*
* This program is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License version 2 as published by
* the Free Software Foundation.
*/
#include <linux/module.h>
#include <linux/kernel.h>
#include <linux/pci.h>
#include <linux/init.h>
#include <linux/ide.h>
#define DRV_NAME "amd74xx"
enum {
AMD_IDE_CONFIG = 0x41,
AMD_CABLE_DETECT = 0x42,
AMD_DRIVE_TIMING = 0x48,
AMD_8BIT_TIMING = 0x4e,
AMD_ADDRESS_SETUP = 0x4c,
AMD_UDMA_TIMING = 0x50,
};
static unsigned int amd_80w;
static unsigned int amd_clock;
static char *amd_dma[] = { "16", "25", "33", "44", "66", "100", "133" };
static unsigned char amd_cyc2udma[] = { 6, 6, 5, 4, 0, 1, 1, 2, 2, 3, 3, 3, 3, 3, 3, 7 };
static inline u8 amd_offset(struct pci_dev *dev)
{
return (dev->vendor == PCI_VENDOR_ID_NVIDIA) ? 0x10 : 0;
}
/*
* amd_set_speed() writes timing values to the chipset registers
*/
static void amd_set_speed(struct pci_dev *dev, u8 dn, u8 udma_mask,
struct ide_timing *timing)
{
u8 t = 0, offset = amd_offset(dev);
pci_read_config_byte(dev, AMD_ADDRESS_SETUP + offset, &t);
t = (t & ~(3 << ((3 - dn) << 1))) | ((clamp_val(timing->setup, 1, 4) - 1) << ((3 - dn) << 1));
pci_write_config_byte(dev, AMD_ADDRESS_SETUP + offset, t);
pci_write_config_byte(dev, AMD_8BIT_TIMING + offset + (1 - (dn >> 1)),
((clamp_val(timing->act8b, 1, 16) - 1) << 4) | (clamp_val(timing->rec8b, 1, 16) - 1));
pci_write_config_byte(dev, AMD_DRIVE_TIMING + offset + (3 - dn),
((clamp_val(timing->active, 1, 16) - 1) << 4) | (clamp_val(timing->recover, 1, 16) - 1));
switch (udma_mask) {
case ATA_UDMA2: t = timing->udma ? (0xc0 | (clamp_val(timing->udma, 2, 5) - 2)) : 0x03; break;
case ATA_UDMA4: t = timing->udma ? (0xc0 | amd_cyc2udma[clamp_val(timing->udma, 2, 10)]) : 0x03; break;
case ATA_UDMA5: t = timing->udma ? (0xc0 | amd_cyc2udma[clamp_val(timing->udma, 1, 10)]) : 0x03; break;
case ATA_UDMA6: t = timing->udma ? (0xc0 | amd_cyc2udma[clamp_val(timing->udma, 1, 15)]) : 0x03; break;
default: return;
}
pci_write_config_byte(dev, AMD_UDMA_TIMING + offset + (3 - dn), t);
}
/*
* amd_set_drive() computes timing values and configures the chipset
* to a desired transfer mode. It also can be called by upper layers.
*/
static void amd_set_drive(ide_drive_t *drive, const u8 speed)
{
ide_hwif_t *hwif = drive->hwif;
struct pci_dev *dev = to_pci_dev(hwif->dev);
ide_drive_t *peer = hwif->drives + (~drive->dn & 1);
struct ide_timing t, p;
int T, UT;
u8 udma_mask = hwif->ultra_mask;
T = 1000000000 / amd_clock;
UT = (udma_mask == ATA_UDMA2) ? T : (T / 2);
ide_timing_compute(drive, speed, &t, T, UT);
if (peer->dev_flags & IDE_DFLAG_PRESENT) {
ide_timing_compute(peer, peer->current_speed, &p, T, UT);
ide_timing_merge(&p, &t, &t, IDE_TIMING_8BIT);
}
if (speed == XFER_UDMA_5 && amd_clock <= 33333) t.udma = 1;
if (speed == XFER_UDMA_6 && amd_clock <= 33333) t.udma = 15;
amd_set_speed(dev, drive->dn, udma_mask, &t);
}
/*
* amd_set_pio_mode() is a callback from upper layers for PIO-only tuning.
*/
static void amd_set_pio_mode(ide_drive_t *drive, const u8 pio)
{
amd_set_drive(drive, XFER_PIO_0 + pio);
}
static void amd7409_cable_detect(struct pci_dev *dev)
{
/* no host side cable detection */
amd_80w = 0x03;
}
static void amd7411_cable_detect(struct pci_dev *dev)
{
int i;
u32 u = 0;
u8 t = 0, offset = amd_offset(dev);
pci_read_config_byte(dev, AMD_CABLE_DETECT + offset, &t);
pci_read_config_dword(dev, AMD_UDMA_TIMING + offset, &u);
amd_80w = ((t & 0x3) ? 1 : 0) | ((t & 0xc) ? 2 : 0);
for (i = 24; i >= 0; i -= 8)
if (((u >> i) & 4) && !(amd_80w & (1 << (1 - (i >> 4))))) {
printk(KERN_WARNING DRV_NAME " %s: BIOS didn't set "
"cable bits correctly. Enabling workaround.\n",
pci_name(dev));
amd_80w |= (1 << (1 - (i >> 4)));
}
}
/*
* The initialization callback. Initialize drive independent registers.
*/
static unsigned int init_chipset_amd74xx(struct pci_dev *dev)
{
u8 t = 0, offset = amd_offset(dev);
/*
* Check 80-wire cable presence.
*/
if (dev->vendor == PCI_VENDOR_ID_AMD &&
dev->device == PCI_DEVICE_ID_AMD_COBRA_7401)
; /* no UDMA > 2 */
else if (dev->vendor == PCI_VENDOR_ID_AMD &&
dev->device == PCI_DEVICE_ID_AMD_VIPER_7409)
amd7409_cable_detect(dev);
else
amd7411_cable_detect(dev);
/*
* Take care of prefetch & postwrite.
*/
pci_read_config_byte(dev, AMD_IDE_CONFIG + offset, &t);
/*
* Check for broken FIFO support.
*/
if (dev->vendor == PCI_VENDOR_ID_AMD &&
dev->vendor == PCI_DEVICE_ID_AMD_VIPER_7411)
t &= 0x0f;
else
t |= 0xf0;
pci_write_config_byte(dev, AMD_IDE_CONFIG + offset, t);
return dev->irq;
}
static u8 amd_cable_detect(ide_hwif_t *hwif)
{
if ((amd_80w >> hwif->channel) & 1)
return ATA_CBL_PATA80;
else
return ATA_CBL_PATA40;
}
static void __devinit init_hwif_amd74xx(ide_hwif_t *hwif)
{
struct pci_dev *dev = to_pci_dev(hwif->dev);
if (hwif->irq == 0) /* 0 is bogus but will do for now */
hwif->irq = pci_get_legacy_ide_irq(dev, hwif->channel);
}
static const struct ide_port_ops amd_port_ops = {
.set_pio_mode = amd_set_pio_mode,
.set_dma_mode = amd_set_drive,
.cable_detect = amd_cable_detect,
};
#define IDE_HFLAGS_AMD \
(IDE_HFLAG_PIO_NO_BLACKLIST | \
IDE_HFLAG_POST_SET_MODE | \
IDE_HFLAG_IO_32BIT | \
IDE_HFLAG_UNMASK_IRQS)
#define DECLARE_AMD_DEV(swdma, udma) \
{ \
.name = DRV_NAME, \
.init_chipset = init_chipset_amd74xx, \
.init_hwif = init_hwif_amd74xx, \
.enablebits = {{0x40,0x02,0x02}, {0x40,0x01,0x01}}, \
.port_ops = &amd_port_ops, \
.host_flags = IDE_HFLAGS_AMD, \
.pio_mask = ATA_PIO5, \
.swdma_mask = swdma, \
.mwdma_mask = ATA_MWDMA2, \
.udma_mask = udma, \
}
#define DECLARE_NV_DEV(udma) \
{ \
.name = DRV_NAME, \
.init_chipset = init_chipset_amd74xx, \
.init_hwif = init_hwif_amd74xx, \
.enablebits = {{0x50,0x02,0x02}, {0x50,0x01,0x01}}, \
.port_ops = &amd_port_ops, \
.host_flags = IDE_HFLAGS_AMD, \
.pio_mask = ATA_PIO5, \
.swdma_mask = ATA_SWDMA2, \
.mwdma_mask = ATA_MWDMA2, \
.udma_mask = udma, \
}
static const struct ide_port_info amd74xx_chipsets[] __devinitdata = {
/* 0: AMD7401 */ DECLARE_AMD_DEV(0x00, ATA_UDMA2),
/* 1: AMD7409 */ DECLARE_AMD_DEV(ATA_SWDMA2, ATA_UDMA4),
/* 2: AMD7411/7441 */ DECLARE_AMD_DEV(ATA_SWDMA2, ATA_UDMA5),
/* 3: AMD8111 */ DECLARE_AMD_DEV(ATA_SWDMA2, ATA_UDMA6),
/* 4: NFORCE */ DECLARE_NV_DEV(ATA_UDMA5),
/* 5: >= NFORCE2 */ DECLARE_NV_DEV(ATA_UDMA6),
/* 6: AMD5536 */ DECLARE_AMD_DEV(ATA_SWDMA2, ATA_UDMA5),
};
static int __devinit amd74xx_probe(struct pci_dev *dev, const struct pci_device_id *id)
{
struct ide_port_info d;
u8 idx = id->driver_data;
d = amd74xx_chipsets[idx];
/*
* Check for bad SWDMA and incorrectly wired Serenade mainboards.
*/
if (idx == 1) {
if (dev->revision <= 7)
d.swdma_mask = 0;
d.host_flags |= IDE_HFLAG_CLEAR_SIMPLEX;
} else if (idx == 3) {
if (dev->subsystem_vendor == PCI_VENDOR_ID_AMD &&
dev->subsystem_device == PCI_DEVICE_ID_AMD_SERENADE)
d.udma_mask = ATA_UDMA5;
}
/*
* It seems that on some nVidia controllers using AltStatus
* register can be unreliable so default to Status register
* if the device is in Compatibility Mode.
*/
if (dev->vendor == PCI_VENDOR_ID_NVIDIA &&
ide_pci_is_in_compatibility_mode(dev))
d.host_flags |= IDE_HFLAG_BROKEN_ALTSTATUS;
printk(KERN_INFO "%s %s: UDMA%s controller\n",
d.name, pci_name(dev), amd_dma[fls(d.udma_mask) - 1]);
/*
* Determine the system bus clock.
*/
amd_clock = (ide_pci_clk ? ide_pci_clk : 33) * 1000;
switch (amd_clock) {
case 33000: amd_clock = 33333; break;
case 37000: amd_clock = 37500; break;
case 41000: amd_clock = 41666; break;
}
if (amd_clock < 20000 || amd_clock > 50000) {
printk(KERN_WARNING "%s: User given PCI clock speed impossible"
" (%d), using 33 MHz instead.\n",
d.name, amd_clock);
amd_clock = 33333;
}
return ide_pci_init_one(dev, &d, NULL);
}
static const struct pci_device_id amd74xx_pci_tbl[] = {
{ PCI_VDEVICE(AMD, PCI_DEVICE_ID_AMD_COBRA_7401), 0 },
{ PCI_VDEVICE(AMD, PCI_DEVICE_ID_AMD_VIPER_7409), 1 },
{ PCI_VDEVICE(AMD, PCI_DEVICE_ID_AMD_VIPER_7411), 2 },
{ PCI_VDEVICE(AMD, PCI_DEVICE_ID_AMD_OPUS_7441), 2 },
{ PCI_VDEVICE(AMD, PCI_DEVICE_ID_AMD_8111_IDE), 3 },
{ PCI_VDEVICE(NVIDIA, PCI_DEVICE_ID_NVIDIA_NFORCE_IDE), 4 },
{ PCI_VDEVICE(NVIDIA, PCI_DEVICE_ID_NVIDIA_NFORCE2_IDE), 5 },
{ PCI_VDEVICE(NVIDIA, PCI_DEVICE_ID_NVIDIA_NFORCE2S_IDE), 5 },
#ifdef CONFIG_BLK_DEV_IDE_SATA
{ PCI_VDEVICE(NVIDIA, PCI_DEVICE_ID_NVIDIA_NFORCE2S_SATA), 5 },
#endif
{ PCI_VDEVICE(NVIDIA, PCI_DEVICE_ID_NVIDIA_NFORCE3_IDE), 5 },
{ PCI_VDEVICE(NVIDIA, PCI_DEVICE_ID_NVIDIA_NFORCE3S_IDE), 5 },
#ifdef CONFIG_BLK_DEV_IDE_SATA
{ PCI_VDEVICE(NVIDIA, PCI_DEVICE_ID_NVIDIA_NFORCE3S_SATA), 5 },
{ PCI_VDEVICE(NVIDIA, PCI_DEVICE_ID_NVIDIA_NFORCE3S_SATA2), 5 },
#endif
{ PCI_VDEVICE(NVIDIA, PCI_DEVICE_ID_NVIDIA_NFORCE_CK804_IDE), 5 },
{ PCI_VDEVICE(NVIDIA, PCI_DEVICE_ID_NVIDIA_NFORCE_MCP04_IDE), 5 },
{ PCI_VDEVICE(NVIDIA, PCI_DEVICE_ID_NVIDIA_NFORCE_MCP51_IDE), 5 },
{ PCI_VDEVICE(NVIDIA, PCI_DEVICE_ID_NVIDIA_NFORCE_MCP55_IDE), 5 },
{ PCI_VDEVICE(NVIDIA, PCI_DEVICE_ID_NVIDIA_NFORCE_MCP61_IDE), 5 },
{ PCI_VDEVICE(NVIDIA, PCI_DEVICE_ID_NVIDIA_NFORCE_MCP65_IDE), 5 },
{ PCI_VDEVICE(NVIDIA, PCI_DEVICE_ID_NVIDIA_NFORCE_MCP67_IDE), 5 },
{ PCI_VDEVICE(NVIDIA, PCI_DEVICE_ID_NVIDIA_NFORCE_MCP73_IDE), 5 },
{ PCI_VDEVICE(NVIDIA, PCI_DEVICE_ID_NVIDIA_NFORCE_MCP77_IDE), 5 },
{ PCI_VDEVICE(AMD, PCI_DEVICE_ID_AMD_CS5536_IDE), 6 },
{ 0, },
};
MODULE_DEVICE_TABLE(pci, amd74xx_pci_tbl);
static struct pci_driver amd74xx_pci_driver = {
.name = "AMD_IDE",
.id_table = amd74xx_pci_tbl,
.probe = amd74xx_probe,
.remove = ide_pci_remove,
.suspend = ide_pci_suspend,
.resume = ide_pci_resume,
};
static int __init amd74xx_ide_init(void)
{
return ide_pci_register_driver(&amd74xx_pci_driver);
}
static void __exit amd74xx_ide_exit(void)
{
pci_unregister_driver(&amd74xx_pci_driver);
}
module_init(amd74xx_ide_init);
module_exit(amd74xx_ide_exit);
MODULE_AUTHOR("Vojtech Pavlik");
MODULE_DESCRIPTION("AMD PCI IDE driver");
MODULE_LICENSE("GPL");
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