ARM: 7218/1: mmc: mmci: Provide option to configure bus signal direction

The ST Micro variant supports bus signal direction indication. A new
member in the variant struct is added for this.

Moreover the actual signal direction configuration is board specific,
thus the amba mmci platform data is extended with a new member to be
able provide mmci with these specific board configurations.

This patch is based upon a patch from Sebastian Rasmussen.

Tested-by: Linus Walleij <linus.walleij@linaro.org>
Signed-off-by: Sebastian Rasmussen <sebastian.rasmussen@stericsson.com>
Signed-off-by: Ulf Hansson <ulf.hansson@stericsson.com>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>

1 files changed, 16 insertions, 0 deletions

diff --git a/include/linux/amba/mmci.h b/include/linux/amba/mmci.h
index 0101e9c17fa1..b51bf5fa85f8 100644
--- a/include/linux/amba/mmci.h
+++ b/include/linux/amba/mmci.h
@@ -6,6 +6,19 @@
 
 #include <linux/mmc/host.h>
 
+
+/*
+ * These defines is places here due to access is needed from machine
+ * configuration files. The ST Micro version does not have ROD and
+ * reuse the voltage registers for direction settings.
+ */
+#define MCI_ST_DATA2DIREN       (1 << 2)
+#define MCI_ST_CMDDIREN         (1 << 3)
+#define MCI_ST_DATA0DIREN       (1 << 4)
+#define MCI_ST_DATA31DIREN      (1 << 5)
+#define MCI_ST_FBCLKEN          (1 << 7)
+#define MCI_ST_DATA74DIREN      (1 << 8)
+
 /* Just some dummy forwarding */
 struct dma_chan;
 
@@ -31,6 +44,8 @@ struct dma_chan;
  * @capabilities: the capabilities of the block as implemented in
  * this platform, signify anything MMC_CAP_* from mmc/host.h
  * @capabilities2: more capabilities, MMC_CAP2_* from mmc/host.h
+ * @sigdir: a bit field indicating for what bits in the MMC bus the host
+ * should enable signal direction indication.
  * @dma_filter: function used to select an appropriate RX and TX
  * DMA channel to be used for DMA, if and only if you're deploying the
  * generic DMA engine
@@ -54,6 +69,7 @@ struct mmci_platform_data {
         bool    cd_invert;
         unsigned long capabilities;
         unsigned long capabilities2;
+        u32 sigdir;
         bool (*dma_filter)(struct dma_chan *chan, void *filter_param);
         void *dma_rx_param;
         void *dma_tx_param;