C++ (Cpp) cpdma_desc_alloc示例

示例#1

文件： davinci_cpdma.c 项目： 03199618/linux

int cpdma_chan_submit(struct cpdma_chan *chan, void *token, void *data,
		      int len, int directed)
{
	struct cpdma_ctlr		*ctlr = chan->ctlr;
	struct cpdma_desc __iomem	*desc;
	dma_addr_t			buffer;
	unsigned long			flags;
	u32				mode;
	int				ret = 0;

	spin_lock_irqsave(&chan->lock, flags);

	if (chan->state == CPDMA_STATE_TEARDOWN) {
		ret = -EINVAL;
		goto unlock_ret;
	}

	desc = cpdma_desc_alloc(ctlr->pool, 1, is_rx_chan(chan));
	if (!desc) {
		chan->stats.desc_alloc_fail++;
		ret = -ENOMEM;
		goto unlock_ret;
	}

	if (len < ctlr->params.min_packet_size) {
		len = ctlr->params.min_packet_size;
		chan->stats.runt_transmit_buff++;
	}

	buffer = dma_map_single(ctlr->dev, data, len, chan->dir);
	ret = dma_mapping_error(ctlr->dev, buffer);
	if (ret) {
		cpdma_desc_free(ctlr->pool, desc, 1);
		ret = -EINVAL;
		goto unlock_ret;
	}

	mode = CPDMA_DESC_OWNER | CPDMA_DESC_SOP | CPDMA_DESC_EOP;
	cpdma_desc_to_port(chan, mode, directed);

	desc_write(desc, hw_next,   0);
	desc_write(desc, hw_buffer, buffer);
	desc_write(desc, hw_len,    len);
	desc_write(desc, hw_mode,   mode | len);
	desc_write(desc, sw_token,  token);
	desc_write(desc, sw_buffer, buffer);
	desc_write(desc, sw_len,    len);

	__cpdma_chan_submit(chan, desc);

	if (chan->state == CPDMA_STATE_ACTIVE && chan->rxfree)
		chan_write(chan, rxfree, 1);

	chan->count++;

unlock_ret:
	spin_unlock_irqrestore(&chan->lock, flags);
	return ret;
}

示例#2

文件： davinci_cpdma.c 项目： G-Ray/xenomai-boneblack-rtnet-drivers

int cpdma_chan_submit(struct cpdma_chan *chan, void *token, void *data,
		      int len, gfp_t gfp_mask)
{
	struct cpdma_ctlr		*ctlr = chan->ctlr;
	struct cpdma_desc __iomem	*desc;
	dma_addr_t			buffer;
	rtdm_lockctx_t			context;
	u32				mode;
	int				ret = 0;

	rtdm_lock_get_irqsave(&chan->lock, context);

	if (chan->state == CPDMA_STATE_TEARDOWN) {
		ret = -EINVAL;
		goto unlock_ret;
	}

	desc = cpdma_desc_alloc(ctlr->pool, 1);
	if (!desc) {
		chan->stats.desc_alloc_fail++;
		ret = -ENOMEM;
		goto unlock_ret;
	}

	if (len < ctlr->params.min_packet_size) {
		len = ctlr->params.min_packet_size;
		chan->stats.runt_transmit_buff++;
	}

	buffer = dma_map_single(ctlr->dev, data, len, chan->dir);
	mode = CPDMA_DESC_OWNER | CPDMA_DESC_SOP | CPDMA_DESC_EOP;

	desc_write(desc, hw_next,   0);
	desc_write(desc, hw_buffer, buffer);
	desc_write(desc, hw_len,    len);
	desc_write(desc, hw_mode,   mode | len);
	desc_write(desc, sw_token,  token);
	desc_write(desc, sw_buffer, buffer);
	desc_write(desc, sw_len,    len);

	__cpdma_chan_submit(chan, desc);

	if (chan->state == CPDMA_STATE_ACTIVE && chan->rxfree)
		chan_write(chan, rxfree, 1);

	chan->count++;

unlock_ret:
	rtdm_lock_put_irqrestore(&chan->lock, context);
	return ret;
}