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mmc: dw_mmc: Handle wp-gpios from device tree
On some SoCs (like exynos5250) you need to use an external GPIO for write protect. Add support for wp-gpios to the core dw_mmc driver since it could be useful across multiple SoCs. With this change I am able to make use of the write protect for the external SD slot on exynos5250-snow. Signed-off-by: Doug Anderson <dianders@chromium.org> Acked-by: Seungwon Jeon <tgih.jun@samsung.com> Acked-by: Olof Johansson <olof@lixom.net> Signed-off-by: Chris Ball <cjb@laptop.org>
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@ -34,6 +34,7 @@
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#include <linux/regulator/consumer.h>
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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 "dw_mmc.h"
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@ -75,6 +76,7 @@ struct idmac_desc {
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* @mmc: The mmc_host representing this slot.
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* @host: The MMC controller this slot is using.
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* @quirks: Slot-level quirks (DW_MCI_SLOT_QUIRK_XXX)
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* @wp_gpio: If gpio_is_valid() we'll use this to read write protect.
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* @ctype: Card type for this slot.
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* @mrq: mmc_request currently being processed or waiting to be
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* processed, or NULL when the slot is idle.
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@ -90,6 +92,7 @@ struct dw_mci_slot {
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struct dw_mci *host;
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int quirks;
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int wp_gpio;
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u32 ctype;
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@ -838,6 +841,8 @@ static int dw_mci_get_ro(struct mmc_host *mmc)
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read_only = 0;
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else if (brd->get_ro)
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read_only = brd->get_ro(slot->id);
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else if (gpio_is_valid(slot->wp_gpio))
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read_only = gpio_get_value(slot->wp_gpio);
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else
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read_only =
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mci_readl(slot->host, WRTPRT) & (1 << slot->id) ? 1 : 0;
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@ -1832,6 +1837,29 @@ static u32 dw_mci_of_get_bus_wd(struct device *dev, u8 slot)
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" as 1\n");
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return bus_wd;
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}
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/* find the write protect gpio for a given slot; or -1 if none specified */
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static int dw_mci_of_get_wp_gpio(struct device *dev, u8 slot)
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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 -EINVAL;
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gpio = of_get_named_gpio(np, "wp-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 -EINVAL;
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if (devm_gpio_request(dev, gpio, "dw-mci-wp")) {
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dev_warn(dev, "gpio [%d] request failed\n", gpio);
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return -EINVAL;
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}
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return 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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@ -1845,6 +1873,10 @@ static struct device_node *dw_mci_of_find_slot_node(struct device *dev, u8 slot)
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{
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return NULL;
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}
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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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#endif /* CONFIG_OF */
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static int dw_mci_init_slot(struct dw_mci *host, unsigned int id)
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@ -1962,6 +1994,8 @@ static int dw_mci_init_slot(struct dw_mci *host, unsigned int id)
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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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mmc_add_host(mmc);
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#if defined(CONFIG_DEBUG_FS)
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