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Commit 26daa1ed authored by Jennifer Li's avatar Jennifer Li Committed by Chris Ball
Browse files

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



This patch disables the broken ADMA on selected O2Micro devices.

Signed-off-by: default avatarJennifer Li <Jennifer.li@o2micro.com>
Reviewed-by: default avatarChris Ball <cjb@laptop.org>
Signed-off-by: default avatarChris Ball <cjb@laptop.org>
parent 17d8020d

drivers/mmc/host/sdhci-pci.c

+112 −0
Original line number Diff line number Diff line
@@ -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)

	},

include/linux/pci_ids.h

+5 −0
Original line number Diff line number Diff line
@@ -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