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piix: backport short cables support from ata_piix.c

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Backport short cables support from ata_piix.c.

This patch should allow UDMA > 2 modes on:
- Acer 5602WLMi
- Acer 3682WLMi
- Asus W5F
- Acer Aspire 2023WLMi

Signed-off-by: Bartlomiej Zolnierkiewicz <bzolnier@gmail.com>
Acked-by: Sergei Shtylyov <sshtylyov@ru.mvista.com>
This commit is contained in:
Bartlomiej Zolnierkiewicz 2007-07-09 23:17:58 +02:00
parent 49521f97cc
commit 7207626f47
1 changed files with 34 additions and 3 deletions
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37
drivers/ide/pci/piix.c
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@ -1,5 +1,5 @@
/*
* linux/drivers/ide/pci/piix.c Version 0.47 February 8, 2007
* linux/drivers/ide/pci/piix.c Version 0.50 Jun 10, 2007
*
* Copyright (C) 1998-1999 Andrzej Krzysztofowicz, Author and Maintainer
* Copyright (C) 1998-2000 Andre Hedrick <andre@linux-ide.org>
@ -394,12 +394,43 @@ static void piix_dma_clear_irq(ide_drive_t *drive)
hwif->OUTB(dma_stat, hwif->dma_status);
}
struct ich_laptop {
u16 device;
u16 subvendor;
u16 subdevice;
};
/*
* List of laptops that use short cables rather than 80 wire
*/
static const struct ich_laptop ich_laptop[] = {
/* devid, subvendor, subdev */
{ 0x27DF, 0x0005, 0x0280 }, /* ICH7 on Acer 5602WLMi */
{ 0x27DF, 0x1025, 0x0110 }, /* ICH7 on Acer 3682WLMi */
{ 0x27DF, 0x1043, 0x1267 }, /* ICH7 on Asus W5F */
{ 0x24CA, 0x1025, 0x0061 }, /* ICH4 on Acer Aspire 2023WLMi */
/* end marker */
{ 0, }
};
static u8 __devinit piix_cable_detect(ide_hwif_t *hwif)
{
struct pci_dev *dev = hwif->pci_dev;
struct pci_dev *pdev = hwif->pci_dev;
const struct ich_laptop *lap = &ich_laptop[0];
u8 reg54h = 0, mask = hwif->channel ? 0xc0 : 0x30;
pci_read_config_byte(dev, 0x54, &reg54h);
/* check for specials */
while (lap->device) {
if (lap->device == pdev->device &&
lap->subvendor == pdev->subsystem_vendor &&
lap->subdevice == pdev->subsystem_device) {
return ATA_CBL_PATA40_SHORT;
}
lap++;
}
pci_read_config_byte(pdev, 0x54, &reg54h);
return (reg54h & mask) ? ATA_CBL_PATA80 : ATA_CBL_PATA40;
}