tmio: add a platform flag to disable card write-protection detection

Write-protection status is not always available, e.g., micro-SD cards do not
have a write-protection switch at all. This patch adds a flag to let platforms
force tmio_mmc to consider the card writable.

Signed-off-by: Guennadi Liakhovetski <g.liakhovetski@gmx.de>
Acked-by: Ian Molton <ian@mnementh.co.uk>
Signed-off-by: Paul Mundt <lethal@linux-sh.org>

2 files changed, 8 insertions, 1 deletions

diff --git a/drivers/mmc/host/tmio_mmc.c b/drivers/mmc/host/tmio_mmc.c
index 3ecd41875fac..faa16b7d9412 100644
--- a/drivers/mmc/host/tmio_mmc.c
+++ b/drivers/mmc/host/tmio_mmc.c
@@ -748,8 +748,11 @@ static void tmio_mmc_set_ios(struct mmc_host *mmc, struct mmc_ios *ios)
 static int tmio_mmc_get_ro(struct mmc_host *mmc)
 {
         struct tmio_mmc_host *host = mmc_priv(mmc);
+        struct mfd_cell *cell = host->pdev->dev.platform_data;
+        struct tmio_mmc_data *pdata = cell->driver_data;
 
-        return (sd_ctrl_read32(host, CTL_STATUS) & TMIO_STAT_WRPROTECT) ? 0 : 1;
+        return ((pdata->flags & TMIO_MMC_WRPROTECT_DISABLE) ||
+                (sd_ctrl_read32(host, CTL_STATUS) & TMIO_STAT_WRPROTECT)) ? 0 : 1;
 }
 
 static const struct mmc_host_ops tmio_mmc_ops = {
diff --git a/include/linux/mfd/tmio.h b/include/linux/mfd/tmio.h
index 360fc953d7bb..feeed0b9ee70 100644
--- a/include/linux/mfd/tmio.h
+++ b/include/linux/mfd/tmio.h
@@ -50,6 +50,9 @@
                 tmio_iowrite16((val) >> 16, (base) + ((reg + 2) << (shift))); \
         } while (0)
 
+/* tmio MMC platform flags */
+#define TMIO_MMC_WRPROTECT_DISABLE      (1 << 0)
+
 int tmio_core_mmc_enable(void __iomem *cnf, int shift, unsigned long base);
 int tmio_core_mmc_resume(void __iomem *cnf, int shift, unsigned long base);
 void tmio_core_mmc_pwr(void __iomem *cnf, int shift, int state);
@@ -66,6 +69,7 @@ struct tmio_mmc_dma {
 struct tmio_mmc_data {
         unsigned int                    hclk;
         unsigned long                   capabilities;
+        unsigned long                   flags;
         struct tmio_mmc_dma             *dma;
         void (*set_pwr)(struct platform_device *host, int state);
         void (*set_clk_div)(struct platform_device *host, int state);