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146 lines
3.6 KiB
146 lines
3.6 KiB
/* SPDX-License-Identifier: GPL-2.0 |
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* |
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* include/asm-sh/dma.h |
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* |
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* Copyright (C) 2003, 2004 Paul Mundt |
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*/ |
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#ifndef __ASM_SH_DMA_H |
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#define __ASM_SH_DMA_H |
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#include <linux/spinlock.h> |
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#include <linux/wait.h> |
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#include <linux/sched.h> |
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#include <linux/device.h> |
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#include <asm-generic/dma.h> |
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/* |
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* Read and write modes can mean drastically different things depending on the |
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* channel configuration. Consult your DMAC documentation and module |
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* implementation for further clues. |
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*/ |
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#define DMA_MODE_READ 0x00 |
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#define DMA_MODE_WRITE 0x01 |
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#define DMA_MODE_MASK 0x01 |
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#define DMA_AUTOINIT 0x10 |
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/* |
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* DMAC (dma_info) flags |
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*/ |
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enum { |
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DMAC_CHANNELS_CONFIGURED = 0x01, |
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DMAC_CHANNELS_TEI_CAPABLE = 0x02, /* Transfer end interrupt */ |
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}; |
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/* |
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* DMA channel capabilities / flags |
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*/ |
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enum { |
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DMA_CONFIGURED = 0x01, |
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/* |
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* Transfer end interrupt, inherited from DMAC. |
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* wait_queue used in dma_wait_for_completion. |
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*/ |
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DMA_TEI_CAPABLE = 0x02, |
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}; |
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extern spinlock_t dma_spin_lock; |
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struct dma_channel; |
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struct dma_ops { |
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int (*request)(struct dma_channel *chan); |
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void (*free)(struct dma_channel *chan); |
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int (*get_residue)(struct dma_channel *chan); |
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int (*xfer)(struct dma_channel *chan); |
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int (*configure)(struct dma_channel *chan, unsigned long flags); |
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int (*extend)(struct dma_channel *chan, unsigned long op, void *param); |
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}; |
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struct dma_channel { |
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char dev_id[16]; /* unique name per DMAC of channel */ |
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unsigned int chan; /* DMAC channel number */ |
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unsigned int vchan; /* Virtual channel number */ |
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unsigned int mode; |
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unsigned int count; |
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unsigned long sar; |
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unsigned long dar; |
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const char **caps; |
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unsigned long flags; |
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atomic_t busy; |
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wait_queue_head_t wait_queue; |
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struct device dev; |
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void *priv_data; |
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}; |
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struct dma_info { |
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struct platform_device *pdev; |
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const char *name; |
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unsigned int nr_channels; |
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unsigned long flags; |
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struct dma_ops *ops; |
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struct dma_channel *channels; |
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struct list_head list; |
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int first_channel_nr; |
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int first_vchannel_nr; |
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}; |
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struct dma_chan_caps { |
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int ch_num; |
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const char **caplist; |
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}; |
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#define to_dma_channel(channel) container_of(channel, struct dma_channel, dev) |
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/* arch/sh/drivers/dma/dma-api.c */ |
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extern int dma_xfer(unsigned int chan, unsigned long from, |
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unsigned long to, size_t size, unsigned int mode); |
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#define dma_write(chan, from, to, size) \ |
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dma_xfer(chan, from, to, size, DMA_MODE_WRITE) |
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#define dma_write_page(chan, from, to) \ |
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dma_write(chan, from, to, PAGE_SIZE) |
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#define dma_read(chan, from, to, size) \ |
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dma_xfer(chan, from, to, size, DMA_MODE_READ) |
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#define dma_read_page(chan, from, to) \ |
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dma_read(chan, from, to, PAGE_SIZE) |
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extern int request_dma_bycap(const char **dmac, const char **caps, |
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const char *dev_id); |
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extern int get_dma_residue(unsigned int chan); |
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extern struct dma_info *get_dma_info(unsigned int chan); |
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extern struct dma_channel *get_dma_channel(unsigned int chan); |
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extern void dma_wait_for_completion(unsigned int chan); |
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extern void dma_configure_channel(unsigned int chan, unsigned long flags); |
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extern int register_dmac(struct dma_info *info); |
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extern void unregister_dmac(struct dma_info *info); |
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extern struct dma_info *get_dma_info_by_name(const char *dmac_name); |
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extern int dma_extend(unsigned int chan, unsigned long op, void *param); |
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extern int register_chan_caps(const char *dmac, struct dma_chan_caps *capslist); |
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/* arch/sh/drivers/dma/dma-sysfs.c */ |
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extern int dma_create_sysfs_files(struct dma_channel *, struct dma_info *); |
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extern void dma_remove_sysfs_files(struct dma_channel *, struct dma_info *); |
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#ifdef CONFIG_PCI |
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extern int isa_dma_bridge_buggy; |
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#else |
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#define isa_dma_bridge_buggy (0) |
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#endif |
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#endif /* __ASM_SH_DMA_H */
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