atmel-mci: change use of dma slave interface

Allow the use of another DMA controller driver in atmel-mci sd/mmc driver.
 This adds a generic dma_slave pointer to the mci platform structure where
we can store DMA controller information.  In atmel-mci we use information
provided by this structure to initialize the driver (with new helper
functions that are architecture dependant).

This also adds at32/avr32 chip modifications to cope with this new access
method.

Signed-off-by: Nicolas Ferre <nicolas.ferre@atmel.com>
Cc: Haavard Skinnemoen <hskinnemoen@atmel.com>
Cc: <linux-mmc@vger.kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

1 files changed, 24 insertions, 0 deletions

diff --git a/arch/arm/mach-at91/include/mach/atmel-mci.h b/arch/arm/mach-at91/include/mach/atmel-mci.h
new file mode 100644
index 000000000000..998cb0c07135
--- /dev/null
+++ b/arch/arm/mach-at91/include/mach/atmel-mci.h
@@ -0,0 +1,24 @@
+#ifndef __MACH_ATMEL_MCI_H
+#define __MACH_ATMEL_MCI_H
+
+#include <mach/at_hdmac.h>
+
+/**
+ * struct mci_dma_data - DMA data for MCI interface
+ */
+struct mci_dma_data {
+        struct at_dma_slave     sdata;
+};
+
+/* accessor macros */
+#define slave_data_ptr(s)       (&(s)->sdata)
+#define find_slave_dev(s)       ((s)->sdata.dma_dev)
+
+#define setup_dma_addr(s, t, r) do {            \
+        if (s) {                                \
+                (s)->sdata.tx_reg = (t);        \
+                (s)->sdata.rx_reg = (r);        \
+        }                                       \
+} while (0)
+
+#endif /* __MACH_ATMEL_MCI_H */