mmc: add DMA support to tmio_mmc driver, when used on SuperH

SDHI controllers on SuperH, served by the tmio_mmc driver, can use slave DMA
for data transfer. This patch adds support for the dmaengine API to the
tmio_mmc driver.

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>

1 files changed, 13 insertions, 0 deletions

diff --git a/drivers/mmc/host/tmio_mmc.h b/drivers/mmc/host/tmio_mmc.h
index dafecfbcd91a..64f7d5dfc106 100644
--- a/drivers/mmc/host/tmio_mmc.h
+++ b/drivers/mmc/host/tmio_mmc.h
@@ -10,6 +10,8 @@
  */
 
 #include <linux/highmem.h>
+#include <linux/interrupt.h>
+#include <linux/dmaengine.h>
 
 #define CTL_SD_CMD 0x00
 #define CTL_ARG_REG 0x04
@@ -106,6 +108,17 @@ struct tmio_mmc_host {
         unsigned int            sg_off;
 
         struct platform_device *pdev;
+
+        /* DMA support */
+        struct dma_chan         *chan_rx;
+        struct dma_chan         *chan_tx;
+        struct tasklet_struct   dma_complete;
+        struct tasklet_struct   dma_issue;
+#ifdef CONFIG_TMIO_MMC_DMA
+        struct dma_async_tx_descriptor *desc;
+        unsigned int            dma_sglen;
+        dma_cookie_t            cookie;
+#endif
 };
 
 #include <linux/io.h>