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mmc: sdhci-acpi: add support for eMMC hardware reset for HID 80860F14

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Add support for eMMC hardware reset for HID 80860F14.

Signed-off-by: Adrian Hunter <adrian.hunter@intel.com>
Signed-off-by: Chris Ball <cjb@laptop.org>
This commit is contained in:
Adrian Hunter 2013-06-13 11:50:27 +03:00 committed by Chris Ball
parent c9faff6cbb
commit b04fa064e7
1 changed files with 27 additions and 1 deletions
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28
drivers/mmc/host/sdhci-acpi.c
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@ -37,6 +37,7 @@
#include <linux/acpi_gpio.h> #include <linux/acpi_gpio.h>
#include <linux/pm.h> #include <linux/pm.h>
#include <linux/pm_runtime.h> #include <linux/pm_runtime.h>
#include <linux/delay.h>
#include <linux/mmc/host.h> #include <linux/mmc/host.h>
#include <linux/mmc/pm.h> #include <linux/mmc/pm.h>
@ -85,12 +86,37 @@ static int sdhci_acpi_enable_dma(struct sdhci_host *host)
return 0; return 0;
} }
static void sdhci_acpi_int_hw_reset(struct sdhci_host *host)
{
u8 reg;
reg = sdhci_readb(host, SDHCI_POWER_CONTROL);
reg |= 0x10;
sdhci_writeb(host, reg, SDHCI_POWER_CONTROL);
/* For eMMC, minimum is 1us but give it 9us for good measure */
udelay(9);
reg &= ~0x10;
sdhci_writeb(host, reg, SDHCI_POWER_CONTROL);
/* For eMMC, minimum is 200us but give it 300us for good measure */
usleep_range(300, 1000);
}
static const struct sdhci_ops sdhci_acpi_ops_dflt = { static const struct sdhci_ops sdhci_acpi_ops_dflt = {
.enable_dma = sdhci_acpi_enable_dma, .enable_dma = sdhci_acpi_enable_dma,
}; };
static const struct sdhci_ops sdhci_acpi_ops_int = {
.enable_dma = sdhci_acpi_enable_dma,
.hw_reset = sdhci_acpi_int_hw_reset,
};
static const struct sdhci_acpi_chip sdhci_acpi_chip_int = {
.ops = &sdhci_acpi_ops_int,
};
static const struct sdhci_acpi_slot sdhci_acpi_slot_int_emmc = { static const struct sdhci_acpi_slot sdhci_acpi_slot_int_emmc = {
.caps = MMC_CAP_8_BIT_DATA | MMC_CAP_NONREMOVABLE, .chip = &sdhci_acpi_chip_int,
.caps = MMC_CAP_8_BIT_DATA | MMC_CAP_NONREMOVABLE | MMC_CAP_HW_RESET,
.caps2 = MMC_CAP2_HC_ERASE_SZ, .caps2 = MMC_CAP2_HC_ERASE_SZ,
.flags = SDHCI_ACPI_RUNTIME_PM, .flags = SDHCI_ACPI_RUNTIME_PM,
}; };