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Diffstat (limited to 'include/asm-sh/dma.h')
| -rw-r--r-- | include/asm-sh/dma.h | 143 |
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 */ |