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Merge branch 'topic/api_caps' into for-linus

This commit is contained in:
Vinod Koul 2013-09-02 17:40:40 +05:30
parent 4770ee4435 ca38ff133e
commit 355cdafe14
2 changed files with 71 additions and 0 deletions
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27
drivers/dma/pl330.c
View File

@ -2870,6 +2870,32 @@ static irqreturn_t pl330_irq_handler(int irq, void *data)
return IRQ_NONE;
}
#define PL330_DMA_BUSWIDTHS \
BIT(DMA_SLAVE_BUSWIDTH_UNDEFINED) | \
BIT(DMA_SLAVE_BUSWIDTH_1_BYTE) | \
BIT(DMA_SLAVE_BUSWIDTH_2_BYTES) | \
BIT(DMA_SLAVE_BUSWIDTH_4_BYTES) | \
BIT(DMA_SLAVE_BUSWIDTH_8_BYTES)
static int pl330_dma_device_slave_caps(struct dma_chan *dchan,
struct dma_slave_caps *caps)
{
caps->src_addr_widths = PL330_DMA_BUSWIDTHS;
caps->dstn_addr_widths = PL330_DMA_BUSWIDTHS;
caps->directions = BIT(DMA_DEV_TO_MEM) | BIT(DMA_MEM_TO_DEV);
caps->cmd_pause = false;
caps->cmd_terminate = true;
/*
* This is the limit for transfers with a buswidth of 1, larger
* buswidths will have larger limits.
*/
caps->max_sg_len = 1900800;
caps->max_sg_nr = 0;
return 0;
}
static int
pl330_probe(struct amba_device *adev, const struct amba_id *id)
{
@ -2975,6 +3001,7 @@ pl330_probe(struct amba_device *adev, const struct amba_id *id)
pd->device_prep_slave_sg = pl330_prep_slave_sg;
pd->device_control = pl330_control;
pd->device_issue_pending = pl330_issue_pending;
pd->device_slave_caps = pl330_dma_device_slave_caps;
ret = dma_async_device_register(pd);
if (ret) {

44
include/linux/dmaengine.h
View File

@ -370,6 +370,33 @@ struct dma_slave_config {
unsigned int slave_id;
};
/* struct dma_slave_caps - expose capabilities of a slave channel only
*
* @src_addr_widths: bit mask of src addr widths the channel supports
* @dstn_addr_widths: bit mask of dstn addr widths the channel supports
* @directions: bit mask of slave direction the channel supported
* since the enum dma_transfer_direction is not defined as bits for each
* type of direction, the dma controller should fill (1 << <TYPE>) and same
* should be checked by controller as well
* @cmd_pause: true, if pause and thereby resume is supported
* @cmd_terminate: true, if terminate cmd is supported
*
* @max_sg_nr: maximum number of SG segments supported
* 0 for no maximum
* @max_sg_len: maximum length of a SG segment supported
* 0 for no maximum
*/
struct dma_slave_caps {
u32 src_addr_widths;
u32 dstn_addr_widths;
u32 directions;
bool cmd_pause;
bool cmd_terminate;
u32 max_sg_nr;
u32 max_sg_len;
};
static inline const char *dma_chan_name(struct dma_chan *chan)
{
return dev_name(&chan->dev->device);
@ -532,6 +559,7 @@ struct dma_tx_state {
* struct with auxiliary transfer status information, otherwise the call
* will just return a simple status code
* @device_issue_pending: push pending transactions to hardware
* @device_slave_caps: return the slave channel capabilities
*/
struct dma_device {
@ -597,6 +625,7 @@ struct dma_device {
dma_cookie_t cookie,
struct dma_tx_state *txstate);
void (*device_issue_pending)(struct dma_chan *chan);
int (*device_slave_caps)(struct dma_chan *chan, struct dma_slave_caps *caps);
};
static inline int dmaengine_device_control(struct dma_chan *chan,
@ -670,6 +699,21 @@ static inline struct dma_async_tx_descriptor *dmaengine_prep_interleaved_dma(
return chan->device->device_prep_interleaved_dma(chan, xt, flags);
}
static inline int dma_get_slave_caps(struct dma_chan *chan, struct dma_slave_caps *caps)
{
if (!chan || !caps)
return -EINVAL;
/* check if the channel supports slave transactions */
if (!test_bit(DMA_SLAVE, chan->device->cap_mask.bits))
return -ENXIO;
if (chan->device->device_slave_caps)
return chan->device->device_slave_caps(chan, caps);
return -ENXIO;
}
static inline int dmaengine_terminate_all(struct dma_chan *chan)
{
return dmaengine_device_control(chan, DMA_TERMINATE_ALL, 0);