UM0851 datasheet(171/245 Pages) STMICROELECTRONICS

171 / 245 page

UM0851

Accelerator engine device drivers

Doc ID 16604 Rev 2

171/245

dma_addr = dma_map_single(chan->device->dev, (void *)src_buf, 100,

DMA_TO_DEVICE);

tx = chan->device->device_prep_slave_sg(chan, sg, sg_len, DMA_TO_DEVICE, 0);

if (!tx) {

dma_unmap_single(chan->device->dev, src_buf, 100, DMA_TO_DEVICE);

return -ENOMEM;

}

tx->callback = skull_callback;

tx->callback_param = NULL;

cookie = tx->tx_submit(tx);

if (dma_submit_error(cookie)) {

printk("submit error %d with src=%x size=100 bytes\n", cookie, src_buf);

return -EAGAIN;

}

return 0;

}

static void skull_callback(void *param)

{

s32 status;

u32 cpu;

/* Details of this function are not provided here.

* It will delete scatter list previously created*/

delete_sg(sg, sg_len);

dma_chan_put(chan);

dma_unmap_single(chan->device->dev, src_buf, 100, DMA_TO_DEVICE);

status = chan->device->device_is_tx_complete(chan, cookie, NULL, NULL);

if (status != DMA_SUCCESS) {

printk("dma xfer fail\n");

return -EAGAIN;

} else {

cpu = get_cpu();

per_cpu_ptr(chan->local, cpu)->bytes_transferred += size;

per_cpu_ptr(chan->local, cpu)->memcpy_count++;

put_cpu();

printk("dma xfer pass\n");

}

dma_async_client_unregister(&dma_client);

}

static enum dma_state_client

dma_event(struct dma_client *client, struct dma_chan *gchan, enum dma_state state)

{

unsigned long flags;

enum dma_state_clientack = DMA_NAK;

switch (state) {

case DMA_RESOURCE_AVAILABLE:

if (!chan) {

chan = gchan;

ack = DMA_ACK;

}

break;

case DMA_RESOURCE_REMOVED:

if (chan == gchan) {

chan = NULL;

ack = DMA_ACK;

}

break;

}

return ack;

}

UM0851 Datasheet(PDF) 171 Page - STMicroelectronics

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