1 files changed, 140 insertions, 0 deletions
diff --git a/arch/sh/include/asm/dma.h b/arch/sh/include/asm/dma.h
new file mode 100644
index 000000000..c8bee3f98
--- /dev/null
+++ b/arch/sh/include/asm/dma.h
@@ -0,0 +1,140 @@
+/* SPDX-License-Identifier: GPL-2.0
+ *
+ * include/asm-sh/dma.h
+ *
+ * Copyright (C) 2003, 2004  Paul Mundt
+ */
+#ifndef __ASM_SH_DMA_H
+#define __ASM_SH_DMA_H
+
+#include <linux/spinlock.h>
+#include <linux/wait.h>
+#include <linux/sched.h>
+#include <linux/device.h>
+#include <asm-generic/dma.h>
+
+/*
+ * 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	= 0x01,
+	DMAC_CHANNELS_TEI_CAPABLE	= 0x02,	/* Transfer end interrupt */
+};
+
+/*
+ * DMA channel capabilities / flags
+ */
+enum {
+	DMA_CONFIGURED			= 0x01,
+
+	/*
+	 * Transfer end interrupt, inherited from DMAC.
+	 * wait_queue used in dma_wait_for_completion.
+	 */
+	DMA_TEI_CAPABLE			= 0x02,
+};
+
+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);
+	int (*configure)(struct dma_channel *chan, unsigned long flags);
+	int (*extend)(struct dma_channel *chan, unsigned long op, void *param);
+};
+
+struct dma_channel {
+	char dev_id[16];		/* unique name per DMAC of channel */
+
+	unsigned int chan;		/* DMAC channel number */
+	unsigned int vchan;		/* Virtual channel number */
+
+	unsigned int mode;
+	unsigned int count;
+
+	unsigned long sar;
+	unsigned long dar;
+
+	const char **caps;
+
+	unsigned long flags;
+	atomic_t busy;
+
+	wait_queue_head_t wait_queue;
+
+	struct device dev;
+	void *priv_data;
+};
+
+struct dma_info {
+	struct platform_device *pdev;
+
+	const char *name;
+	unsigned int nr_channels;
+	unsigned long flags;
+
+	struct dma_ops *ops;
+	struct dma_channel *channels;
+
+	struct list_head list;
+	int first_channel_nr;
+	int first_vchannel_nr;
+};
+
+struct dma_chan_caps {
+	int ch_num;
+	const char **caplist;
+};
+
+#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_bycap(const char **dmac, const char **caps,
+			     const char *dev_id);
+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);
+extern struct dma_info *get_dma_info_by_name(const char *dmac_name);
+
+extern int dma_extend(unsigned int chan, unsigned long op, void *param);
+extern int register_chan_caps(const char *dmac, struct dma_chan_caps *capslist);
+
+/* arch/sh/drivers/dma/dma-sysfs.c */
+extern int dma_create_sysfs_files(struct dma_channel *, struct dma_info *);
+extern void dma_remove_sysfs_files(struct dma_channel *, struct dma_info *);
+
+#endif /* __ASM_SH_DMA_H */