piix: backport short cables support from ata_piix.c
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>
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@ -1,5 +1,5 @@
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/*
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* linux/drivers/ide/pci/piix.c Version 0.47 February 8, 2007
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* linux/drivers/ide/pci/piix.c Version 0.50 Jun 10, 2007
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*
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* Copyright (C) 1998-1999 Andrzej Krzysztofowicz, Author and Maintainer
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* Copyright (C) 1998-2000 Andre Hedrick <andre@linux-ide.org>
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@ -394,12 +394,43 @@ static void piix_dma_clear_irq(ide_drive_t *drive)
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hwif->OUTB(dma_stat, hwif->dma_status);
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}
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struct ich_laptop {
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u16 device;
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u16 subvendor;
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u16 subdevice;
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};
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/*
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* List of laptops that use short cables rather than 80 wire
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*/
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static const struct ich_laptop ich_laptop[] = {
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/* devid, subvendor, subdev */
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{ 0x27DF, 0x0005, 0x0280 }, /* ICH7 on Acer 5602WLMi */
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{ 0x27DF, 0x1025, 0x0110 }, /* ICH7 on Acer 3682WLMi */
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{ 0x27DF, 0x1043, 0x1267 }, /* ICH7 on Asus W5F */
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{ 0x24CA, 0x1025, 0x0061 }, /* ICH4 on Acer Aspire 2023WLMi */
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/* end marker */
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{ 0, }
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};
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static u8 __devinit piix_cable_detect(ide_hwif_t *hwif)
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{
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struct pci_dev *dev = hwif->pci_dev;
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struct pci_dev *pdev = hwif->pci_dev;
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const struct ich_laptop *lap = &ich_laptop[0];
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u8 reg54h = 0, mask = hwif->channel ? 0xc0 : 0x30;
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pci_read_config_byte(dev, 0x54, ®54h);
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/* check for specials */
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while (lap->device) {
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if (lap->device == pdev->device &&
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lap->subvendor == pdev->subsystem_vendor &&
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lap->subdevice == pdev->subsystem_device) {
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return ATA_CBL_PATA40_SHORT;
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}
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lap++;
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}
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pci_read_config_byte(pdev, 0x54, ®54h);
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return (reg54h & mask) ? ATA_CBL_PATA80 : ATA_CBL_PATA40;
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}
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