mmc: sh_mmcif: add DMA support

The MMCIF controller on sh-mobile platforms can use the DMA controller for data
transfers. Interface to the SH dmaengine driver to enable DMA. We also have to
lower the maximum number of segments to match with the number od DMA
descriptors on SuperH, this doesn't significantly affect driver's PIO
performance.

Signed-off-by: Guennadi Liakhovetski <g.liakhovetski@gmx.de>
Signed-off-by: Paul Mundt <lethal@linux-sh.org>

1 files changed, 11 insertions, 4 deletions

diff --git a/include/linux/mmc/sh_mmcif.h b/include/linux/mmc/sh_mmcif.h
index a6bfa5296495..f216a8879b58 100644
--- a/include/linux/mmc/sh_mmcif.h
+++ b/include/linux/mmc/sh_mmcif.h
@@ -14,8 +14,9 @@
 #ifndef __SH_MMCIF_H__
 #define __SH_MMCIF_H__
 
-#include <linux/platform_device.h>
 #include <linux/io.h>
+#include <linux/platform_device.h>
+#include <linux/sh_dma.h>
 
 /*
  * MMCIF : CE_CLK_CTRL [19:16]
@@ -31,13 +32,19 @@
  * 1111 : Peripheral clock (sup_pclk set '1')
  */
 
+struct sh_mmcif_dma {
+        struct sh_dmae_slave chan_priv_tx;
+        struct sh_dmae_slave chan_priv_rx;
+};
+
 struct sh_mmcif_plat_data {
         void (*set_pwr)(struct platform_device *pdev, int state);
         void (*down_pwr)(struct platform_device *pdev);
         int (*get_cd)(struct platform_device *pdef);
-        u8      sup_pclk;       /* 1 :SH7757, 0: SH7724/SH7372 */
-        unsigned long caps;
-        u32     ocr;
+        struct sh_mmcif_dma     *dma;
+        u8                      sup_pclk;       /* 1 :SH7757, 0: SH7724/SH7372 */
+        unsigned long           caps;
+        u32                     ocr;
 };
 
 #define MMCIF_CE_CMD_SET        0x00000000