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method add to retrieve pio data via DMA #6927

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method add to retrieve pio data via DMA #6927

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18 changes: 18 additions & 0 deletions drivers/misc/rp1-pio.c
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Original file line number Diff line number Diff line change
Expand Up @@ -971,6 +971,24 @@ int rp1_pio_sm_xfer_data(struct rp1_pio_client *client, uint sm, uint dir,
}
EXPORT_SYMBOL_GPL(rp1_pio_sm_xfer_data);

void *rp1_pio_sm_buffer_virt(struct rp1_pio_client *client,
unsigned sm, unsigned dir, int index)
{
struct rp1_pio_device *pio = client->pio;
struct dma_info *dma;

if (sm >= RP1_PIO_SMS_COUNT || dir >= RP1_PIO_DIR_COUNT)
return NULL;

dma = &pio->dma_configs[sm][dir];

if (index >= dma->buf_count)
return NULL;

return dma->bufs[index].buf;
}
EXPORT_SYMBOL_GPL(rp1_pio_sm_buffer_virt);

struct handler_info {
const char *name;
int (*func)(struct rp1_pio_client *client, void *param);
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1 change: 1 addition & 0 deletions include/linux/pio_rp1.h
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Expand Up @@ -190,6 +190,7 @@ int rp1_pio_sm_config_xfer(struct rp1_pio_client *client, uint sm, uint dir,
int rp1_pio_sm_xfer_data(struct rp1_pio_client *client, uint sm, uint dir,
uint data_bytes, void *data, dma_addr_t dma_addr,
void (*callback)(void *param), void *param);
void *rp1_pio_sm_buffer_virt(struct rp1_pio_client *client, unsigned sm, unsigned dir, int index);

int rp1_pio_can_add_program(struct rp1_pio_client *client, void *param);
int rp1_pio_add_program(struct rp1_pio_client *client, void *param);
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