1 files changed, 143 insertions, 0 deletions

diff --git a/include/asm-sh/dma.h b/include/asm-sh/dma.h
new file mode 100644
index 000000000000..8e9436093ca8
--- /dev/null
+++ b/include/asm-sh/dma.h
@@ -0,0 +1,143 @@
+/*
+ * include/asm-sh/dma.h
+ *
+ * Copyright (C) 2003, 2004  Paul Mundt
+ *
+ * This file is subject to the terms and conditions of the GNU General Public
+ * License.  See the file "COPYING" in the main directory of this archive
+ * for more details.
+ */
+#ifndef __ASM_SH_DMA_H
+#define __ASM_SH_DMA_H
+#ifdef __KERNEL__
+
+#include <linux/config.h>
+#include <linux/spinlock.h>
+#include <linux/wait.h>
+#include <linux/sysdev.h>
+#include <asm/cpu/dma.h>
+#include <asm/semaphore.h>
+
+/* The maximum address that we can perform a DMA transfer to on this platform */
+/* Don't define MAX_DMA_ADDRESS; it's useless on the SuperH and any
+   occurrence should be flagged as an error.  */
+/* But... */
+/* XXX: This is not applicable to SuperH, just needed for alloc_bootmem */
+#define MAX_DMA_ADDRESS         (PAGE_OFFSET+0x10000000)
+
+#ifdef CONFIG_NR_DMA_CHANNELS
+#  define MAX_DMA_CHANNELS      (CONFIG_NR_DMA_CHANNELS)
+#else
+#  define MAX_DMA_CHANNELS      (CONFIG_NR_ONCHIP_DMA_CHANNELS)
+#endif
+
+/*
+ * Read and write modes can mean drastically different things depending on the
+ * channel configuration. Consult your DMAC documentation and module
+ * implementation for further clues.
+ */
+#define DMA_MODE_READ           0x00
+#define DMA_MODE_WRITE          0x01
+#define DMA_MODE_MASK           0x01
+
+#define DMA_AUTOINIT            0x10
+
+/*
+ * DMAC (dma_info) flags
+ */
+enum {
+        DMAC_CHANNELS_CONFIGURED        = 0x00,
+        DMAC_CHANNELS_TEI_CAPABLE       = 0x01,
+};
+
+/*
+ * DMA channel capabilities / flags
+ */
+enum {
+        DMA_CONFIGURED                  = 0x00,
+        DMA_TEI_CAPABLE                 = 0x01,
+};
+
+extern spinlock_t dma_spin_lock;
+
+struct dma_channel;
+
+struct dma_ops {
+        int (*request)(struct dma_channel *chan);
+        void (*free)(struct dma_channel *chan);
+
+        int (*get_residue)(struct dma_channel *chan);
+        int (*xfer)(struct dma_channel *chan);
+        void (*configure)(struct dma_channel *chan, unsigned long flags);
+};
+
+struct dma_channel {
+        char dev_id[16];
+
+        unsigned int chan;
+        unsigned int mode;
+        unsigned int count;
+
+        unsigned long sar;
+        unsigned long dar;
+
+        unsigned long flags;
+        atomic_t busy;
+
+        struct semaphore sem;
+        wait_queue_head_t wait_queue;
+
+        struct sys_device dev;
+};
+
+struct dma_info {
+        const char *name;
+        unsigned int nr_channels;
+        unsigned long flags;
+
+        struct dma_ops *ops;
+        struct dma_channel *channels;
+
+        struct list_head list;
+};
+
+#define to_dma_channel(channel) container_of(channel, struct dma_channel, dev)
+
+/* arch/sh/drivers/dma/dma-api.c */
+extern int dma_xfer(unsigned int chan, unsigned long from,
+                    unsigned long to, size_t size, unsigned int mode);
+
+#define dma_write(chan, from, to, size) \
+        dma_xfer(chan, from, to, size, DMA_MODE_WRITE)
+#define dma_write_page(chan, from, to)  \
+        dma_write(chan, from, to, PAGE_SIZE)
+
+#define dma_read(chan, from, to, size)  \
+        dma_xfer(chan, from, to, size, DMA_MODE_READ)
+#define dma_read_page(chan, from, to)   \
+        dma_read(chan, from, to, PAGE_SIZE)
+
+extern int request_dma(unsigned int chan, const char *dev_id);
+extern void free_dma(unsigned int chan);
+extern int get_dma_residue(unsigned int chan);
+extern struct dma_info *get_dma_info(unsigned int chan);
+extern struct dma_channel *get_dma_channel(unsigned int chan);
+extern void dma_wait_for_completion(unsigned int chan);
+extern void dma_configure_channel(unsigned int chan, unsigned long flags);
+
+extern int register_dmac(struct dma_info *info);
+extern void unregister_dmac(struct dma_info *info);
+
+#ifdef CONFIG_SYSFS
+/* arch/sh/drivers/dma/dma-sysfs.c */
+extern int dma_create_sysfs_files(struct dma_channel *);
+#endif
+
+#ifdef CONFIG_PCI
+extern int isa_dma_bridge_buggy;
+#else
+#define isa_dma_bridge_buggy    (0)
+#endif
+
+#endif /* __KERNEL__ */
+#endif /* __ASM_SH_DMA_H */