mmc: dw_mmc: use slot-gpio to handle cd pin
Suggested by Jaehoon: Use slot-gpio to handle cd-gpio Add function dw_mci_of_get_cd_gpio to check "cd-gpios" from dts. mmc_gpio_request_cd and mmc_gpio_get_cd are used to handle cd pin Signed-off-by: Zhangfei Gao <zhangfei.gao@linaro.org> Acked-by: Jaehoon Chung <jh80.chung@samsung.com> Acked-by: Arnd Bergmann <arnd@arndb.de> Signed-off-by: Chris Ball <chris@printf.net>
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01acf6917a
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1 changed files with 35 additions and 13 deletions
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@ -36,6 +36,7 @@
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#include <linux/workqueue.h>
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#include <linux/of.h>
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#include <linux/of_gpio.h>
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#include <linux/mmc/slot-gpio.h>
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#include "dw_mmc.h"
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@ -1032,20 +1033,26 @@ static int dw_mci_get_cd(struct mmc_host *mmc)
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int present;
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struct dw_mci_slot *slot = mmc_priv(mmc);
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struct dw_mci_board *brd = slot->host->pdata;
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int gpio_cd = !mmc_gpio_get_cd(mmc);
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/* Use platform get_cd function, else try onboard card detect */
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if (brd->quirks & DW_MCI_QUIRK_BROKEN_CARD_DETECTION)
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present = 1;
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else if (brd->get_cd)
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present = !brd->get_cd(slot->id);
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else if (!IS_ERR_VALUE(gpio_cd))
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present = !!gpio_cd;
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else
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present = (mci_readl(slot->host, CDETECT) & (1 << slot->id))
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== 0 ? 1 : 0;
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if (present)
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if (present) {
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set_bit(DW_MMC_CARD_PRESENT, &slot->flags);
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dev_dbg(&mmc->class_dev, "card is present\n");
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else
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} else {
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clear_bit(DW_MMC_CARD_PRESENT, &slot->flags);
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dev_dbg(&mmc->class_dev, "card is not present\n");
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}
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return present;
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}
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@ -1926,10 +1933,6 @@ static void dw_mci_work_routine_card(struct work_struct *work)
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/* Card change detected */
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slot->last_detect_state = present;
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/* Mark card as present if applicable */
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if (present != 0)
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set_bit(DW_MMC_CARD_PRESENT, &slot->flags);
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/* Clean up queue if present */
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mrq = slot->mrq;
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if (mrq) {
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@ -1977,8 +1980,6 @@ static void dw_mci_work_routine_card(struct work_struct *work)
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/* Power down slot */
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if (present == 0) {
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clear_bit(DW_MMC_CARD_PRESENT, &slot->flags);
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/* Clear down the FIFO */
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dw_mci_fifo_reset(host);
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#ifdef CONFIG_MMC_DW_IDMAC
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@ -2079,6 +2080,26 @@ static int dw_mci_of_get_wp_gpio(struct device *dev, u8 slot)
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return gpio;
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}
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/* find the cd gpio for a given slot; or -1 if none specified */
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static void dw_mci_of_get_cd_gpio(struct device *dev, u8 slot,
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struct mmc_host *mmc)
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{
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struct device_node *np = dw_mci_of_find_slot_node(dev, slot);
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int gpio;
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if (!np)
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return;
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gpio = of_get_named_gpio(np, "cd-gpios", 0);
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/* Having a missing entry is valid; return silently */
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if (!gpio_is_valid(gpio))
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return;
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if (mmc_gpio_request_cd(mmc, gpio, 0))
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dev_warn(dev, "gpio [%d] request failed\n", gpio);
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}
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#else /* CONFIG_OF */
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static int dw_mci_of_get_slot_quirks(struct device *dev, u8 slot)
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{
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@ -2096,6 +2117,11 @@ static int dw_mci_of_get_wp_gpio(struct device *dev, u8 slot)
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{
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return -EINVAL;
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}
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static void dw_mci_of_get_cd_gpio(struct device *dev, u8 slot,
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struct mmc_host *mmc)
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{
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return;
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}
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#endif /* CONFIG_OF */
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static int dw_mci_init_slot(struct dw_mci *host, unsigned int id)
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@ -2197,12 +2223,8 @@ static int dw_mci_init_slot(struct dw_mci *host, unsigned int id)
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#endif /* CONFIG_MMC_DW_IDMAC */
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}
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if (dw_mci_get_cd(mmc))
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set_bit(DW_MMC_CARD_PRESENT, &slot->flags);
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else
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clear_bit(DW_MMC_CARD_PRESENT, &slot->flags);
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slot->wp_gpio = dw_mci_of_get_wp_gpio(host->dev, slot->id);
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dw_mci_of_get_cd_gpio(host->dev, slot->id, mmc);
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ret = mmc_add_host(mmc);
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if (ret)
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