diff options
| author | Adrian Hunter | 2013-06-13 10:50:27 +0200 |
|---|---|---|
| committer | Chris Ball | 2013-07-05 18:46:25 +0200 |
| commit | b04fa064e72c301e075c2d52c146282f8f464083 (patch) | |
| tree | 2cf681690ba40dfe4bb5836678f754790cf7bb28 /drivers/mmc | |
| parent | mmc: sdhci-pci: add support for eMMC hardware reset for BYT eMMC. (diff) | |
| download | kernel-qcow2-linux-b04fa064e72c301e075c2d52c146282f8f464083.tar.gz kernel-qcow2-linux-b04fa064e72c301e075c2d52c146282f8f464083.tar.xz kernel-qcow2-linux-b04fa064e72c301e075c2d52c146282f8f464083.zip | |
mmc: sdhci-acpi: add support for eMMC hardware reset for HID 80860F14
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>
Diffstat (limited to 'drivers/mmc')
| -rw-r--r-- | drivers/mmc/host/sdhci-acpi.c | 28 |
1 files changed, 27 insertions, 1 deletions
diff --git a/drivers/mmc/host/sdhci-acpi.c b/drivers/mmc/host/sdhci-acpi.c index 08a85ec33224..cdd4ce0d7c90 100644 --- a/drivers/mmc/host/sdhci-acpi.c +++ b/drivers/mmc/host/sdhci-acpi.c @@ -37,6 +37,7 @@ #include <linux/acpi_gpio.h> #include <linux/pm.h> #include <linux/pm_runtime.h> +#include <linux/delay.h> #include <linux/mmc/host.h> #include <linux/mmc/pm.h> @@ -85,12 +86,37 @@ static int sdhci_acpi_enable_dma(struct sdhci_host *host) 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 = { .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 = { - .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, .flags = SDHCI_ACPI_RUNTIME_PM, }; |