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android_kernel_motorola_sm6225/drivers/ide/pci/atiixp.c
Bartlomiej Zolnierkiewicz 39baf8a798 atiixp/jmicron/triflex: fix PIO fallback 
* atiixp: if DMA can't be used atiixp_config_drive_for_dma() should return 0,
  atiixp_dma_check() will tune the correct PIO mode anyway

* jmicron: if DMA can't be used config_chipset_for_dma() should return 0,
  micron_config_drive_for_dma() will tune the correct PIO mode anyway

  config_jmicron_chipset_for_pio(drive, !speed) doesn't program
  device transfer mode for speed != 0 (only wastes some CPU cycles
  on ide_get_best_pio_mode() call) so remove it

* triflex: if DMA can't be used triflex_config_drive_for_dma() should return 0,
  triflex_config_drive_xfer_rate() will tune correct PIO mode anyway

Above changes also fix (theoretical) issue when ->speedproc fails to set
device transfer mode (i.e. when ide_config_drive_speed() fails to program it)
but one of DMA transfer modes is already enabled on the device by the BIOS.
In such scenario ide_dma_enable() will incorrectly return true statement
and ->ide_dma_check will try to enable DMA on the device.

Signed-off-by: Bartlomiej Zolnierkiewicz <bzolnier@gmail.com>
2007-02-17 02:40:20 +01:00

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/*
* linux/drivers/ide/pci/atiixp.c Version 0.01-bart2 Feb. 26, 2004
*
* Copyright (C) 2003 ATI Inc. <hyu@ati.com>
* Copyright (C) 2004 Bartlomiej Zolnierkiewicz
*
*/
#include <linux/types.h>
#include <linux/module.h>
#include <linux/kernel.h>
#include <linux/ioport.h>
#include <linux/pci.h>
#include <linux/hdreg.h>
#include <linux/ide.h>
#include <linux/delay.h>
#include <linux/init.h>
#include <asm/io.h>
#define ATIIXP_IDE_PIO_TIMING 0x40
#define ATIIXP_IDE_MDMA_TIMING 0x44
#define ATIIXP_IDE_PIO_CONTROL 0x48
#define ATIIXP_IDE_PIO_MODE 0x4a
#define ATIIXP_IDE_UDMA_CONTROL 0x54
#define ATIIXP_IDE_UDMA_MODE 0x56
typedef struct {
u8 command_width;
u8 recover_width;
} atiixp_ide_timing;
static atiixp_ide_timing pio_timing[] = {
{ 0x05, 0x0d },
{ 0x04, 0x07 },
{ 0x03, 0x04 },
{ 0x02, 0x02 },
{ 0x02, 0x00 },
};
static atiixp_ide_timing mdma_timing[] = {
{ 0x07, 0x07 },
{ 0x02, 0x01 },
{ 0x02, 0x00 },
};
static int save_mdma_mode[4];
static DEFINE_SPINLOCK(atiixp_lock);
/**
* atiixp_ratemask - compute rate mask for ATIIXP IDE
* @drive: IDE drive to compute for
*
* Returns the available modes for the ATIIXP IDE controller.
*/
static u8 atiixp_ratemask(ide_drive_t *drive)
{
u8 mode = 3;
if (!eighty_ninty_three(drive))
mode = min(mode, (u8)1);
return mode;
}
/**
* atiixp_dma_2_pio - return the PIO mode matching DMA
* @xfer_rate: transfer speed
*
* Returns the nearest equivalent PIO timing for the PIO or DMA
* mode requested by the controller.
*/
static u8 atiixp_dma_2_pio(u8 xfer_rate) {
switch(xfer_rate) {
case XFER_UDMA_6:
case XFER_UDMA_5:
case XFER_UDMA_4:
case XFER_UDMA_3:
case XFER_UDMA_2:
case XFER_UDMA_1:
case XFER_UDMA_0:
case XFER_MW_DMA_2:
case XFER_PIO_4:
return 4;
case XFER_MW_DMA_1:
case XFER_PIO_3:
return 3;
case XFER_SW_DMA_2:
case XFER_PIO_2:
return 2;
case XFER_MW_DMA_0:
case XFER_SW_DMA_1:
case XFER_SW_DMA_0:
case XFER_PIO_1:
case XFER_PIO_0:
case XFER_PIO_SLOW:
default:
return 0;
}
}
static int atiixp_ide_dma_host_on(ide_drive_t *drive)
{
struct pci_dev *dev = drive->hwif->pci_dev;
unsigned long flags;
u16 tmp16;
spin_lock_irqsave(&atiixp_lock, flags);
pci_read_config_word(dev, ATIIXP_IDE_UDMA_CONTROL, &tmp16);
if (save_mdma_mode[drive->dn])
tmp16 &= ~(1 << drive->dn);
else
tmp16 |= (1 << drive->dn);
pci_write_config_word(dev, ATIIXP_IDE_UDMA_CONTROL, tmp16);
spin_unlock_irqrestore(&atiixp_lock, flags);
return __ide_dma_host_on(drive);
}
static int atiixp_ide_dma_host_off(ide_drive_t *drive)
{
struct pci_dev *dev = drive->hwif->pci_dev;
unsigned long flags;
u16 tmp16;
spin_lock_irqsave(&atiixp_lock, flags);
pci_read_config_word(dev, ATIIXP_IDE_UDMA_CONTROL, &tmp16);
tmp16 &= ~(1 << drive->dn);
pci_write_config_word(dev, ATIIXP_IDE_UDMA_CONTROL, tmp16);
spin_unlock_irqrestore(&atiixp_lock, flags);
return __ide_dma_host_off(drive);
}
/**
* atiixp_tune_drive - tune a drive attached to a ATIIXP
* @drive: drive to tune
* @pio: desired PIO mode
*
* Set the interface PIO mode.
*/
static void atiixp_tuneproc(ide_drive_t *drive, u8 pio)
{
struct pci_dev *dev = drive->hwif->pci_dev;
unsigned long flags;
int timing_shift = (drive->dn & 2) ? 16 : 0 + (drive->dn & 1) ? 0 : 8;
u32 pio_timing_data;
u16 pio_mode_data;
spin_lock_irqsave(&atiixp_lock, flags);
pci_read_config_word(dev, ATIIXP_IDE_PIO_MODE, &pio_mode_data);
pio_mode_data &= ~(0x07 << (drive->dn * 4));
pio_mode_data |= (pio << (drive->dn * 4));
pci_write_config_word(dev, ATIIXP_IDE_PIO_MODE, pio_mode_data);
pci_read_config_dword(dev, ATIIXP_IDE_PIO_TIMING, &pio_timing_data);
pio_timing_data &= ~(0xff << timing_shift);
pio_timing_data |= (pio_timing[pio].recover_width << timing_shift) |
(pio_timing[pio].command_width << (timing_shift + 4));
pci_write_config_dword(dev, ATIIXP_IDE_PIO_TIMING, pio_timing_data);
spin_unlock_irqrestore(&atiixp_lock, flags);
}
/**
* atiixp_tune_chipset - tune a ATIIXP interface
* @drive: IDE drive to tune
* @xferspeed: speed to configure
*
* Set a ATIIXP interface channel to the desired speeds. This involves
* requires the right timing data into the ATIIXP configuration space
* then setting the drive parameters appropriately
*/
static int atiixp_speedproc(ide_drive_t *drive, u8 xferspeed)
{
struct pci_dev *dev = drive->hwif->pci_dev;
unsigned long flags;
int timing_shift = (drive->dn & 2) ? 16 : 0 + (drive->dn & 1) ? 0 : 8;
u32 tmp32;
u16 tmp16;
u8 speed, pio;
speed = ide_rate_filter(atiixp_ratemask(drive), xferspeed);
spin_lock_irqsave(&atiixp_lock, flags);
save_mdma_mode[drive->dn] = 0;
if (speed >= XFER_UDMA_0) {
pci_read_config_word(dev, ATIIXP_IDE_UDMA_MODE, &tmp16);
tmp16 &= ~(0x07 << (drive->dn * 4));
tmp16 |= ((speed & 0x07) << (drive->dn * 4));
pci_write_config_word(dev, ATIIXP_IDE_UDMA_MODE, tmp16);
} else {
if ((speed >= XFER_MW_DMA_0) && (speed <= XFER_MW_DMA_2)) {
save_mdma_mode[drive->dn] = speed;
pci_read_config_dword(dev, ATIIXP_IDE_MDMA_TIMING, &tmp32);
tmp32 &= ~(0xff << timing_shift);
tmp32 |= (mdma_timing[speed & 0x03].recover_width << timing_shift) |
(mdma_timing[speed & 0x03].command_width << (timing_shift + 4));
pci_write_config_dword(dev, ATIIXP_IDE_MDMA_TIMING, tmp32);
}
}
spin_unlock_irqrestore(&atiixp_lock, flags);
if (speed >= XFER_SW_DMA_0)
pio = atiixp_dma_2_pio(speed);
else
pio = speed - XFER_PIO_0;
atiixp_tuneproc(drive, pio);
return ide_config_drive_speed(drive, speed);
}
/**
* atiixp_config_drive_for_dma - configure drive for DMA
* @drive: IDE drive to configure
*
* Set up a ATIIXP interface channel for the best available speed.
* We prefer UDMA if it is available and then MWDMA. If DMA is
* not available we switch to PIO and return 0.
*/
static int atiixp_config_drive_for_dma(ide_drive_t *drive)
{
u8 speed = ide_dma_speed(drive, atiixp_ratemask(drive));
if (!speed)
return 0;
(void) atiixp_speedproc(drive, speed);
return ide_dma_enable(drive);
}
/**
* atiixp_dma_check - set up an IDE device
* @drive: IDE drive to configure
*
* Set up the ATIIXP interface for the best available speed on this
* interface, preferring DMA to PIO.
*/
static int atiixp_dma_check(ide_drive_t *drive)
{
ide_hwif_t *hwif = HWIF(drive);
struct hd_driveid *id = drive->id;
u8 tspeed, speed;
drive->init_speed = 0;
if ((id->capability & 1) && drive->autodma) {
if (ide_use_dma(drive)) {
if (atiixp_config_drive_for_dma(drive))
return hwif->ide_dma_on(drive);
}
goto fast_ata_pio;
} else if ((id->capability & 8) || (id->field_valid & 2)) {
fast_ata_pio:
tspeed = ide_get_best_pio_mode(drive, 255, 5, NULL);
speed = atiixp_dma_2_pio(XFER_PIO_0 + tspeed) + XFER_PIO_0;
hwif->speedproc(drive, speed);
return hwif->ide_dma_off_quietly(drive);
}
/* IORDY not supported */
return 0;
}
/**
* init_hwif_atiixp - fill in the hwif for the ATIIXP
* @hwif: IDE interface
*
* Set up the ide_hwif_t for the ATIIXP interface according to the
* capabilities of the hardware.
*/
static void __devinit init_hwif_atiixp(ide_hwif_t *hwif)
{
u8 udma_mode = 0;
u8 ch = hwif->channel;
struct pci_dev *pdev = hwif->pci_dev;
if (!hwif->irq)
hwif->irq = ch ? 15 : 14;
hwif->autodma = 0;
hwif->tuneproc = &atiixp_tuneproc;
hwif->speedproc = &atiixp_speedproc;
hwif->drives[0].autotune = 1;
hwif->drives[1].autotune = 1;
if (!hwif->dma_base)
return;
hwif->atapi_dma = 1;
hwif->ultra_mask = 0x3f;
hwif->mwdma_mask = 0x06;
hwif->swdma_mask = 0x04;
pci_read_config_byte(pdev, ATIIXP_IDE_UDMA_MODE + ch, &udma_mode);
if ((udma_mode & 0x07) >= 0x04 || (udma_mode & 0x70) >= 0x40)
hwif->udma_four = 1;
else
hwif->udma_four = 0;
hwif->ide_dma_host_on = &atiixp_ide_dma_host_on;
hwif->ide_dma_host_off = &atiixp_ide_dma_host_off;
hwif->ide_dma_check = &atiixp_dma_check;
if (!noautodma)
hwif->autodma = 1;
hwif->drives[1].autodma = hwif->autodma;
hwif->drives[0].autodma = hwif->autodma;
}
static ide_pci_device_t atiixp_pci_info[] __devinitdata = {
{ /* 0 */
.name = "ATIIXP",
.init_hwif = init_hwif_atiixp,
.channels = 2,
.autodma = AUTODMA,
.enablebits = {{0x48,0x01,0x00}, {0x48,0x08,0x00}},
.bootable = ON_BOARD,
},{ /* 1 */
.name = "SB600_PATA",
.init_hwif = init_hwif_atiixp,
.channels = 1,
.autodma = AUTODMA,
.enablebits = {{0x48,0x01,0x00}, {0x00,0x00,0x00}},
.bootable = ON_BOARD,
},
};
/**
* atiixp_init_one - called when a ATIIXP is found
* @dev: the atiixp 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 atiixp_init_one(struct pci_dev *dev, const struct pci_device_id *id)
{
return ide_setup_pci_device(dev, &atiixp_pci_info[id->driver_data]);
}
static struct pci_device_id atiixp_pci_tbl[] = {
{ PCI_VENDOR_ID_ATI, PCI_DEVICE_ID_ATI_IXP200_IDE, PCI_ANY_ID, PCI_ANY_ID, 0, 0, 0},
{ PCI_VENDOR_ID_ATI, PCI_DEVICE_ID_ATI_IXP300_IDE, PCI_ANY_ID, PCI_ANY_ID, 0, 0, 0},
{ PCI_VENDOR_ID_ATI, PCI_DEVICE_ID_ATI_IXP400_IDE, PCI_ANY_ID, PCI_ANY_ID, 0, 0, 0},
{ PCI_VENDOR_ID_ATI, PCI_DEVICE_ID_ATI_IXP600_IDE, PCI_ANY_ID, PCI_ANY_ID, 0, 0, 1},
{ 0, },
};
MODULE_DEVICE_TABLE(pci, atiixp_pci_tbl);
static struct pci_driver driver = {
.name = "ATIIXP_IDE",
.id_table = atiixp_pci_tbl,
.probe = atiixp_init_one,
};
static int __init atiixp_ide_init(void)
{
return ide_pci_register_driver(&driver);
}
module_init(atiixp_ide_init);
MODULE_AUTHOR("HUI YU");
MODULE_DESCRIPTION("PCI driver module for ATI IXP IDE");
MODULE_LICENSE("GPL");
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