mmc: sdhi: Add write16_hook

Some controllers require waiting for the bus to become idle
before writing to some registers. I have implemented this
by adding a hook to sd_ctrl_write16() and implementing
a hook for SDHI which waits for the bus to become idle.

Cc: Guennadi Liakhovetski <g.liakhovetski@gmx.de>
Cc: Magnus Damm <magnus.damm@gmail.com>
Signed-off-by: Simon Horman <horms@verge.net.au>
Signed-off-by: Chris Ball <cjb@laptop.org>

1 files changed, 8 insertions, 0 deletions

diff --git a/include/linux/mfd/tmio.h b/include/linux/mfd/tmio.h
index 5a90266c3a5a..0dc98044d8b7 100644
--- a/include/linux/mfd/tmio.h
+++ b/include/linux/mfd/tmio.h
@@ -68,6 +68,11 @@
  * controller and report the event to the driver.
  */
 #define TMIO_MMC_HAS_COLD_CD            (1 << 3)
+/*
+ * Some controllers require waiting for the SD bus to become
+ * idle before writing to some registers.
+ */
+#define TMIO_MMC_HAS_IDLE_WAIT          (1 << 4)
 
 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);
@@ -80,6 +85,8 @@ struct tmio_mmc_dma {
         int alignment_shift;
 };
 
+struct tmio_mmc_host;
+
 /*
  * data for the MMC controller
  */
@@ -94,6 +101,7 @@ struct tmio_mmc_data {
         void (*set_pwr)(struct platform_device *host, int state);
         void (*set_clk_div)(struct platform_device *host, int state);
         int (*get_cd)(struct platform_device *host);
+        int (*write16_hook)(struct tmio_mmc_host *host, int addr);
 };
 
 static inline void tmio_mmc_cd_wakeup(struct tmio_mmc_data *pdata)