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dma: sh: use an integer slave ID to improve API compatibility

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Initially struct shdma_slave has been introduced with the only member - an
unsigned slave ID - to describe common properties of DMA slaves in an
extensible way. However, experience shows, that a slave ID is indeed the
only parameter, needed to identify DMA slaves. This is also, what is used
by the core dmaengine API in struct dma_slave_config. We switch to using
the slave_id directly, instead of passing a pointer to struct shdma_slave
to improve compatibility with the core. We also make the slave_id signed
for easier error checking.

Signed-off-by: Guennadi Liakhovetski <g.liakhovetski@gmx.de>
Signed-off-by: Vinod Koul <vinod.koul@linux.intel.com>
This commit is contained in:
Guennadi Liakhovetski
2012-07-05 12:29:41 +02:00
committed by Vinod Koul
parent ecf90fbbdc
commit c2cdb7e4d1
4 changed files with 27 additions and 26 deletions
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include/linux/shdma-base.h
+4 -4
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@@ -43,7 +43,7 @@ struct device;
*/
struct shdma_slave {
unsigned int slave_id;
int slave_id;
};
struct shdma_desc {
@@ -66,7 +66,7 @@ struct shdma_chan {
size_t max_xfer_len; /* max transfer length */
int id; /* Raw id of this channel */
int irq; /* Channel IRQ */
struct shdma_slave *slave; /* Client data for slave DMA */
int slave_id; /* Client ID for slave DMA */
enum shdma_pm_state pm_state;
};
@@ -93,8 +93,8 @@ struct shdma_ops {
dma_addr_t (*slave_addr)(struct shdma_chan *);
int (*desc_setup)(struct shdma_chan *, struct shdma_desc *,
dma_addr_t, dma_addr_t, size_t *);
int (*set_slave)(struct shdma_chan *, struct shdma_slave *);
void (*setup_xfer)(struct shdma_chan *, struct shdma_slave *);
int (*set_slave)(struct shdma_chan *, int);
void (*setup_xfer)(struct shdma_chan *, int);
void (*start_xfer)(struct shdma_chan *, struct shdma_desc *);
struct shdma_desc *(*embedded_desc)(void *, int);
bool (*chan_irq)(struct shdma_chan *, int);