mmc: sdhci-esdhc-imx: add write protect on custom GPIO on mx25/35

Signed-off-by: Wolfram Sang <w.sang@pengutronix.de>
Tested-by: Marc Reilly <marc@cpdesign.com.au>
Tested-by: Eric Benard <eric@eukrea.com>
Signed-off-by: Chris Ball <cjb@laptop.org>

1 files changed, 41 insertions, 11 deletions

diff --git a/drivers/mmc/host/sdhci-esdhc-imx.c b/drivers/mmc/host/sdhci-esdhc-imx.c
index 9b82910b9db..65df00bb00d 100644
--- a/drivers/mmc/host/sdhci-esdhc-imx.c
+++ b/drivers/mmc/host/sdhci-esdhc-imx.c
@@ -15,9 +15,11 @@
 #include <linux/delay.h>
 #include <linux/err.h>
 #include <linux/clk.h>
+#include <linux/gpio.h>
 #include <linux/mmc/host.h>
 #include <linux/mmc/sdhci-pltfm.h>
 #include <mach/hardware.h>
+#include <mach/esdhc.h>
 #include "sdhci.h"
 #include "sdhci-pltfm.h"
 #include "sdhci-esdhc.h"
@@ -100,10 +102,31 @@ static unsigned int esdhc_pltfm_get_min_clock(struct sdhci_host *host)
         return clk_get_rate(pltfm_host->clk) / 256 / 16;
 }
 
+static unsigned int esdhc_pltfm_get_ro(struct sdhci_host *host)
+{
+        struct esdhc_platform_data *boarddata = host->mmc->parent->platform_data;
+
+        if (boarddata && gpio_is_valid(boarddata->wp_gpio))
+                return gpio_get_value(boarddata->wp_gpio);
+        else
+                return -ENOSYS;
+}
+
+static struct sdhci_ops sdhci_esdhc_ops = {
+        .read_w = esdhc_readw_le,
+        .write_w = esdhc_writew_le,
+        .write_b = esdhc_writeb_le,
+        .set_clock = esdhc_set_clock,
+        .get_max_clock = esdhc_pltfm_get_max_clock,
+        .get_min_clock = esdhc_pltfm_get_min_clock,
+};
+
 static int esdhc_pltfm_init(struct sdhci_host *host, struct sdhci_pltfm_data *pdata)
 {
         struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host);
+        struct esdhc_platform_data *boarddata = host->mmc->parent->platform_data;
         struct clk *clk;
+        int err;
 
         clk = clk_get(mmc_dev(host->mmc), NULL);
         if (IS_ERR(clk)) {
@@ -116,9 +139,21 @@ static int esdhc_pltfm_init(struct sdhci_host *host, struct sdhci_pltfm_data *pd
         if (cpu_is_mx35() || cpu_is_mx51())
                 host->quirks |= SDHCI_QUIRK_BROKEN_TIMEOUT_VAL;
 
-        /* Fix errata ENGcm07207 which is present on i.MX25 and i.MX35 */
-        if (cpu_is_mx25() || cpu_is_mx35())
+        if (cpu_is_mx25() || cpu_is_mx35()) {
+                /* Fix errata ENGcm07207 present on i.MX25 and i.MX35 */
                 host->quirks |= SDHCI_QUIRK_NO_MULTIBLOCK;
+                /* write_protect can't be routed to controller, use gpio */
+                sdhci_esdhc_ops.get_ro = esdhc_pltfm_get_ro;
+        }
+
+        if (boarddata) {
+                err = gpio_request_one(boarddata->wp_gpio, GPIOF_IN, "ESDHC_WP");
+                if (err) {
+                        dev_warn(mmc_dev(host->mmc),
+                                "no write-protect pin available!\n");
+                        boarddata->wp_gpio = err;
+                }
+        }
 
         return 0;
 }
@@ -126,20 +161,15 @@ static int esdhc_pltfm_init(struct sdhci_host *host, struct sdhci_pltfm_data *pd
 static void esdhc_pltfm_exit(struct sdhci_host *host)
 {
         struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host);
+        struct esdhc_platform_data *boarddata = host->mmc->parent->platform_data;
+
+        if (boarddata && gpio_is_valid(boarddata->wp_gpio))
+                gpio_free(boarddata->wp_gpio);
 
         clk_disable(pltfm_host->clk);
         clk_put(pltfm_host->clk);
 }
 
-static struct sdhci_ops sdhci_esdhc_ops = {
-        .read_w = esdhc_readw_le,
-        .write_w = esdhc_writew_le,
-        .write_b = esdhc_writeb_le,
-        .set_clock = esdhc_set_clock,
-        .get_max_clock = esdhc_pltfm_get_max_clock,
-        .get_min_clock = esdhc_pltfm_get_min_clock,
-};
-
 struct sdhci_pltfm_data sdhci_esdhc_imx_pdata = {
         .quirks = ESDHC_DEFAULT_QUIRKS | SDHCI_QUIRK_BROKEN_ADMA,
         /* ADMA has issues. Might be fixable */