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sdhci: toggle JMicron PMOS setting

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Some of the JMicron chips requires us to manually enable the power
output stages of the chip. Add the necessary hooks and functions to
manage this.

Signed-off-by: Pierre Ossman <drzeus@drzeus.cx>
This commit is contained in:
Pierre Ossman 2008-03-24 13:09:09 +01:00
parent ee53ab5d73
commit 45211e2159
1 changed files with 67 additions and 0 deletions
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67
drivers/mmc/host/sdhci-pci.c
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@ -44,6 +44,8 @@ struct sdhci_pci_fixes {
unsigned int quirks;
int (*probe)(struct sdhci_pci_chip*);
int (*resume)(struct sdhci_pci_chip*);
};
struct sdhci_pci_slot {
@ -101,10 +103,69 @@ static const struct sdhci_pci_fixes sdhci_cafe = {
SDHCI_QUIRK_BROKEN_TIMEOUT_VAL,
};
static int jmicron_pmos(struct sdhci_pci_chip *chip, int on)
{
u8 scratch;
int ret;
ret = pci_read_config_byte(chip->pdev, 0xAE, &scratch);
if (ret)
return ret;
/*
* Turn PMOS on [bit 0], set over current detection to 2.4 V
* [bit 1:2] and enable over current debouncing [bit 6].
*/
if (on)
scratch |= 0x47;
else
scratch &= ~0x47;
ret = pci_write_config_byte(chip->pdev, 0xAE, scratch);
if (ret)
return ret;
return 0;
}
static int jmicron_probe(struct sdhci_pci_chip *chip)
{
int ret;
/*
* JMicron chips need a bit of a nudge to enable the power
* output pins.
*/
ret = jmicron_pmos(chip, 1);
if (ret) {
dev_err(&chip->pdev->dev, "Failure enabling card power\n");
return ret;
}
return 0;
}
static int jmicron_resume(struct sdhci_pci_chip *chip)
{
int ret;
ret = jmicron_pmos(chip, 1);
if (ret) {
dev_err(&chip->pdev->dev, "Failure enabling card power\n");
return ret;
}
return 0;
}
static const struct sdhci_pci_fixes sdhci_jmicron = {
.quirks = SDHCI_QUIRK_32BIT_DMA_ADDR |
SDHCI_QUIRK_32BIT_DMA_SIZE |
SDHCI_QUIRK_RESET_AFTER_REQUEST,
.probe = jmicron_probe,
.resume = jmicron_resume,
};
static const struct pci_device_id pci_ids[] __devinitdata = {
@ -264,6 +325,12 @@ static int sdhci_pci_resume (struct pci_dev *pdev)
if (ret)
return ret;
if (chip->fixes && chip->fixes->resume) {
ret = chip->fixes->resume(chip);
if (ret)
return ret;
}
for (i = 0;i < chip->num_slots;i++) {
slot = chip->slots[i];
if (!slot)