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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>
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1 changed files with 27 additions and 1 deletions
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@ -37,6 +37,7 @@
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#include <linux/acpi_gpio.h>
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#include <linux/pm.h>
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#include <linux/pm_runtime.h>
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#include <linux/delay.h>
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#include <linux/mmc/host.h>
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#include <linux/mmc/pm.h>
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@ -85,12 +86,37 @@ static int sdhci_acpi_enable_dma(struct sdhci_host *host)
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return 0;
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}
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static void sdhci_acpi_int_hw_reset(struct sdhci_host *host)
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{
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u8 reg;
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reg = sdhci_readb(host, SDHCI_POWER_CONTROL);
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reg |= 0x10;
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sdhci_writeb(host, reg, SDHCI_POWER_CONTROL);
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/* For eMMC, minimum is 1us but give it 9us for good measure */
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udelay(9);
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reg &= ~0x10;
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sdhci_writeb(host, reg, SDHCI_POWER_CONTROL);
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/* For eMMC, minimum is 200us but give it 300us for good measure */
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usleep_range(300, 1000);
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}
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static const struct sdhci_ops sdhci_acpi_ops_dflt = {
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.enable_dma = sdhci_acpi_enable_dma,
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};
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static const struct sdhci_ops sdhci_acpi_ops_int = {
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.enable_dma = sdhci_acpi_enable_dma,
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.hw_reset = sdhci_acpi_int_hw_reset,
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};
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static const struct sdhci_acpi_chip sdhci_acpi_chip_int = {
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.ops = &sdhci_acpi_ops_int,
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};
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static const struct sdhci_acpi_slot sdhci_acpi_slot_int_emmc = {
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.caps = MMC_CAP_8_BIT_DATA | MMC_CAP_NONREMOVABLE,
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.chip = &sdhci_acpi_chip_int,
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.caps = MMC_CAP_8_BIT_DATA | MMC_CAP_NONREMOVABLE | MMC_CAP_HW_RESET,
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.caps2 = MMC_CAP2_HC_ERASE_SZ,
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.flags = SDHCI_ACPI_RUNTIME_PM,
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};
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