1 files changed, 93 insertions, 0 deletions

diff --git a/include/linux/platform_data/dma-ep93xx.h b/include/linux/platform_data/dma-ep93xx.h
new file mode 100644
index 000000000000..e82c642fa53c
--- /dev/null
+++ b/include/linux/platform_data/dma-ep93xx.h
@@ -0,0 +1,93 @@
+#ifndef __ASM_ARCH_DMA_H
+#define __ASM_ARCH_DMA_H
+
+#include <linux/types.h>
+#include <linux/dmaengine.h>
+#include <linux/dma-mapping.h>
+
+/*
+ * M2P channels.
+ *
+ * Note that these values are also directly used for setting the PPALLOC
+ * register.
+ */
+#define EP93XX_DMA_I2S1         0
+#define EP93XX_DMA_I2S2         1
+#define EP93XX_DMA_AAC1         2
+#define EP93XX_DMA_AAC2         3
+#define EP93XX_DMA_AAC3         4
+#define EP93XX_DMA_I2S3         5
+#define EP93XX_DMA_UART1        6
+#define EP93XX_DMA_UART2        7
+#define EP93XX_DMA_UART3        8
+#define EP93XX_DMA_IRDA         9
+/* M2M channels */
+#define EP93XX_DMA_SSP          10
+#define EP93XX_DMA_IDE          11
+
+/**
+ * struct ep93xx_dma_data - configuration data for the EP93xx dmaengine
+ * @port: peripheral which is requesting the channel
+ * @direction: TX/RX channel
+ * @name: optional name for the channel, this is displayed in /proc/interrupts
+ *
+ * This information is passed as private channel parameter in a filter
+ * function. Note that this is only needed for slave/cyclic channels.  For
+ * memcpy channels %NULL data should be passed.
+ */
+struct ep93xx_dma_data {
+        int                             port;
+        enum dma_transfer_direction     direction;
+        const char                      *name;
+};
+
+/**
+ * struct ep93xx_dma_chan_data - platform specific data for a DMA channel
+ * @name: name of the channel, used for getting the right clock for the channel
+ * @base: mapped registers
+ * @irq: interrupt number used by this channel
+ */
+struct ep93xx_dma_chan_data {
+        const char                      *name;
+        void __iomem                    *base;
+        int                             irq;
+};
+
+/**
+ * struct ep93xx_dma_platform_data - platform data for the dmaengine driver
+ * @channels: array of channels which are passed to the driver
+ * @num_channels: number of channels in the array
+ *
+ * This structure is passed to the DMA engine driver via platform data. For
+ * M2P channels, contract is that even channels are for TX and odd for RX.
+ * There is no requirement for the M2M channels.
+ */
+struct ep93xx_dma_platform_data {
+        struct ep93xx_dma_chan_data     *channels;
+        size_t                          num_channels;
+};
+
+static inline bool ep93xx_dma_chan_is_m2p(struct dma_chan *chan)
+{
+        return !strcmp(dev_name(chan->device->dev), "ep93xx-dma-m2p");
+}
+
+/**
+ * ep93xx_dma_chan_direction - returns direction the channel can be used
+ * @chan: channel
+ *
+ * This function can be used in filter functions to find out whether the
+ * channel supports given DMA direction. Only M2P channels have such
+ * limitation, for M2M channels the direction is configurable.
+ */
+static inline enum dma_transfer_direction
+ep93xx_dma_chan_direction(struct dma_chan *chan)
+{
+        if (!ep93xx_dma_chan_is_m2p(chan))
+                return DMA_NONE;
+
+        /* even channels are for TX, odd for RX */
+        return (chan->chan_id % 2 == 0) ? DMA_MEM_TO_DEV : DMA_DEV_TO_MEM;
+}
+
+#endif /* __ASM_ARCH_DMA_H */