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mmc: sdhci: Disable ADMA on some O2Micro SD/MMC parts. 

This patch disables the broken ADMA on selected O2Micro devices.

Signed-off-by: Jennifer Li <Jennifer.li@o2micro.com>
Reviewed-by: Chris Ball <cjb@laptop.org>
Signed-off-by: Chris Ball <cjb@laptop.org>
hifive-unleashed-5.1
Jennifer Li 2010-11-17 23:01:59 -05:00 committed by Chris Ball
parent 17d8020d9a
commit 26daa1ed40
2 changed files with 117 additions and 0 deletions
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112
drivers/mmc/host/sdhci-pci.c
View File

@ -176,6 +176,74 @@ static const struct sdhci_pci_fixes sdhci_intel_mfd_emmc_sdio = {
.quirks = SDHCI_QUIRK_NO_ENDATTR_IN_NOPDESC,
};
/* O2Micro extra registers */
#define O2_SD_LOCK_WP 0xD3
#define O2_SD_MULTI_VCC3V 0xEE
#define O2_SD_CLKREQ 0xEC
#define O2_SD_CAPS 0xE0
#define O2_SD_ADMA1 0xE2
#define O2_SD_ADMA2 0xE7
#define O2_SD_INF_MOD 0xF1
static int o2_probe(struct sdhci_pci_chip *chip)
{
int ret;
u8 scratch;
switch (chip->pdev->device) {
case PCI_DEVICE_ID_O2_8220:
case PCI_DEVICE_ID_O2_8221:
case PCI_DEVICE_ID_O2_8320:
case PCI_DEVICE_ID_O2_8321:
/* This extra setup is required due to broken ADMA. */
ret = pci_read_config_byte(chip->pdev, O2_SD_LOCK_WP, &scratch);
if (ret)
return ret;
scratch &= 0x7f;
pci_write_config_byte(chip->pdev, O2_SD_LOCK_WP, scratch);
/* Set Multi 3 to VCC3V# */
pci_write_config_byte(chip->pdev, O2_SD_MULTI_VCC3V, 0x08);
/* Disable CLK_REQ# support after media DET */
ret = pci_read_config_byte(chip->pdev, O2_SD_CLKREQ, &scratch);
if (ret)
return ret;
scratch |= 0x20;
pci_write_config_byte(chip->pdev, O2_SD_CLKREQ, scratch);
/* Choose capabilities, enable SDMA. We have to write 0x01
* to the capabilities register first to unlock it.
*/
ret = pci_read_config_byte(chip->pdev, O2_SD_CAPS, &scratch);
if (ret)
return ret;
scratch |= 0x01;
pci_write_config_byte(chip->pdev, O2_SD_CAPS, scratch);
pci_write_config_byte(chip->pdev, O2_SD_CAPS, 0x73);
/* Disable ADMA1/2 */
pci_write_config_byte(chip->pdev, O2_SD_ADMA1, 0x39);
pci_write_config_byte(chip->pdev, O2_SD_ADMA2, 0x08);
/* Disable the infinite transfer mode */
ret = pci_read_config_byte(chip->pdev, O2_SD_INF_MOD, &scratch);
if (ret)
return ret;
scratch |= 0x08;
pci_write_config_byte(chip->pdev, O2_SD_INF_MOD, scratch);
/* Lock WP */
ret = pci_read_config_byte(chip->pdev, O2_SD_LOCK_WP, &scratch);
if (ret)
return ret;
scratch |= 0x80;
pci_write_config_byte(chip->pdev, O2_SD_LOCK_WP, scratch);
}
return 0;
}
static int jmicron_pmos(struct sdhci_pci_chip *chip, int on)
{
u8 scratch;
@ -339,6 +407,10 @@ static int jmicron_resume(struct sdhci_pci_chip *chip)
return 0;
}
static const struct sdhci_pci_fixes sdhci_o2 = {
.probe = o2_probe,
};
static const struct sdhci_pci_fixes sdhci_jmicron = {
.probe = jmicron_probe,
@ -589,6 +661,46 @@ static const struct pci_device_id pci_ids[] __devinitdata = {
.driver_data = (kernel_ulong_t)&sdhci_intel_mfd_emmc_sdio,
},
{
.vendor = PCI_VENDOR_ID_O2,
.device = PCI_DEVICE_ID_O2_8120,
.subvendor = PCI_ANY_ID,
.subdevice = PCI_ANY_ID,
.driver_data = (kernel_ulong_t)&sdhci_o2,
},
{
.vendor = PCI_VENDOR_ID_O2,
.device = PCI_DEVICE_ID_O2_8220,
.subvendor = PCI_ANY_ID,
.subdevice = PCI_ANY_ID,
.driver_data = (kernel_ulong_t)&sdhci_o2,
},
{
.vendor = PCI_VENDOR_ID_O2,
.device = PCI_DEVICE_ID_O2_8221,
.subvendor = PCI_ANY_ID,
.subdevice = PCI_ANY_ID,
.driver_data = (kernel_ulong_t)&sdhci_o2,
},
{
.vendor = PCI_VENDOR_ID_O2,
.device = PCI_DEVICE_ID_O2_8320,
.subvendor = PCI_ANY_ID,
.subdevice = PCI_ANY_ID,
.driver_data = (kernel_ulong_t)&sdhci_o2,
},
{
.vendor = PCI_VENDOR_ID_O2,
.device = PCI_DEVICE_ID_O2_8321,
.subvendor = PCI_ANY_ID,
.subdevice = PCI_ANY_ID,
.driver_data = (kernel_ulong_t)&sdhci_o2,
},
{ /* Generic SD host controller */
PCI_DEVICE_CLASS((PCI_CLASS_SYSTEM_SDHCI << 8), 0xFFFF00)
},

5
include/linux/pci_ids.h
View File

@ -1650,6 +1650,11 @@
#define PCI_DEVICE_ID_O2_6836 0x6836
#define PCI_DEVICE_ID_O2_6812 0x6872
#define PCI_DEVICE_ID_O2_6933 0x6933
#define PCI_DEVICE_ID_O2_8120 0x8120
#define PCI_DEVICE_ID_O2_8220 0x8220
#define PCI_DEVICE_ID_O2_8221 0x8221
#define PCI_DEVICE_ID_O2_8320 0x8320
#define PCI_DEVICE_ID_O2_8321 0x8321
#define PCI_VENDOR_ID_3DFX 0x121a
#define PCI_DEVICE_ID_3DFX_VOODOO 0x0001