[PATCH v3 3/3] sdhci-s3c: Add SDHCI_QUIRK_NO_WP_BIT quirk for Samsung SoC

Kukjin Kim
2010-07-23T11:56:31Z

From: Hyuk Lee <hyuk1.lee@samsung.com>

If host controller doesn't have WP pin which should be connnected with SDMMC
card WP pin, can implement get_ro function with using the allocated gpio.
In order to use this quirk wp_gpio in the platform data must be set.

Signed-off-by: Hyuk Lee <hyuk1.lee@samsung.com>
Signed-off-by: Kukjin Kim <kgene.kim@samsung.com>
---
drivers/mmc/host/sdhci-s3c.c | 43 ++++++++++++++++++++++++++++++++++++++++++
drivers/mmc/host/sdhci.c | 3 ++
drivers/mmc/host/sdhci.h | 3 ++
3 files changed, 49 insertions(+), 0 deletions(-)

diff --git a/drivers/mmc/host/sdhci-s3c.c b/drivers/mmc/host/sdhci-s3c.c
index 0d25285..0b75e57 100644
--- a/drivers/mmc/host/sdhci-s3c.c
+++ b/drivers/mmc/host/sdhci-s3c.c
@@ -22,6 +22,7 @@

#include <linux/mmc/host.h>

+#include <plat/gpio-cfg.h>
#include <plat/sdhci.h>
#include <plat/regs-sdhci.h>

@@ -213,6 +214,36 @@ static void sdhci_s3c_set_clock(struct sdhci_host *host, unsigned int clock)
}

/**
+ * sdhci_s3c_get_ro - callback for get_ro
+ * @host: The SDHCI host being changed
+ *
+ * If the WP pin is connected with GPIO, can get the value which indicates
+ * the card is locked or not.
+*/
+static int sdhci_s3c_get_ro(struct mmc_host *mmc)
+{
+ struct sdhci_s3c *sc;
+ struct sdhci_host *host;
+
+ host = mmc_priv(mmc);
+ sc = sdhci_priv(host);
+
+ return gpio_get_value(sc->pdata->wp_gpio);
+}
+
+/**
+ * sdhci_s3c_cfg_wp - configure GPIO for WP pin
+ * @gpio_num: GPIO number which connected with WP line from SD/MMC slot
+ *
+ * Configure GPIO for using WP line
+*/
+static void sdhci_s3c_cfg_wp(unsigned int gpio_num)
+{
+ s3c_gpio_cfgpin(gpio_num, S3C_GPIO_INPUT);
+ s3c_gpio_setpull(gpio_num, S3C_GPIO_PULL_UP);
+}
+
+/**
* sdhci_s3c_get_min_clock - callback to get minimal supported clock value
* @host: The SDHCI host being queried
*
@@ -375,6 +406,9 @@ static int __devinit sdhci_s3c_probe(struct platform_device *pdev)
if (pdata->cfg_gpio)
pdata->cfg_gpio(pdev, pdata->max_width);

+ if (gpio_is_valid(pdata->wp_gpio))
+ sdhci_s3c_ops.get_ro = sdhci_s3c_get_ro;
+
host->hw_name = "samsung-hsmmc";
host->ops = &sdhci_s3c_ops;
host->quirks = 0;
@@ -408,6 +442,15 @@ static int __devinit sdhci_s3c_probe(struct platform_device *pdev)
host->quirks |= (SDHCI_QUIRK_32BIT_DMA_ADDR |
SDHCI_QUIRK_32BIT_DMA_SIZE);

+ /* Controller's WP pin donsn't connected with SD card and there is an
+ * allocated GPIO for getting WP data form SD card, use this quirk and
+ * send the GPIO number in pdata->wp_gpio. */
+ host->quirks |= SDHCI_QUIRK_NO_WP_BIT;
+
+ /* to configure gpio pin as a card write protection signal */
+ if (gpio_is_valid(pdata->wp_gpio))
+ sdhci_s3c_cfg_wp(pdata->wp_gpio);
+
ret = sdhci_add_host(host);
if (ret) {
dev_err(dev, "sdhci_add_host() failed\n");
diff --git a/drivers/mmc/host/sdhci.c b/drivers/mmc/host/sdhci.c
index f9ca4c6..7fba401 100644
--- a/drivers/mmc/host/sdhci.c
+++ b/drivers/mmc/host/sdhci.c
@@ -1198,6 +1198,9 @@ static int sdhci_get_ro(struct mmc_host *mmc)

host = mmc_priv(mmc);

+ if ((host->quirks & SDHCI_QUIRK_NO_WP_BIT) && host->ops->get_ro)
+ return host->ops->get_ro(mmc);
+
spin_lock_irqsave(&host->lock, flags);

if (host->flags & SDHCI_DEVICE_DEAD)
diff --git a/drivers/mmc/host/sdhci.h b/drivers/mmc/host/sdhci.h
index 0de8b38..dd9a233 100644
--- a/drivers/mmc/host/sdhci.h
+++ b/drivers/mmc/host/sdhci.h
@@ -247,6 +247,8 @@ struct sdhci_host {
#define SDHCI_QUIRK_MISSING_CAPS (1<<28)
/* Controller has nonstandard clock management */
#define SDHCI_QUIRK_NONSTANDARD_MINCLOCK (1<<29)
+/* Controller has no write-protect pin connected with SD card */
+#define SDHCI_QUIRK_NO_WP_BIT (1<<30)

int irq; /* Device IRQ */
void __iomem * ioaddr; /* Mapped address */
@@ -321,6 +323,7 @@ struct sdhci_ops {
unsigned int (*get_max_clock)(struct sdhci_host *host);
unsigned int (*get_min_clock)(struct sdhci_host *host);
unsigned int (*get_timeout_clock)(struct sdhci_host *host);
+ int (*get_ro)(struct mmc_host *mmc);
};

#ifdef CONFIG_MMC_SDHCI_IO_ACCESSORS
--
1.6.2.5