C++ (Cpp) vx2_setup_pseudo_dma示例

示例#1

文件： vx222_ops.c 项目： jameshilliard/actiontec_opensrc_mi424wr-rev-e-f_fw-20-10-7-5

/* pseudo-dma write */
static void vx2_dma_write(struct vx_core *chip, struct snd_pcm_runtime *runtime,
			  struct vx_pipe *pipe, int count)
{
	unsigned long port = vx2_reg_addr(chip, VX_DMA);
	int offset = pipe->hw_ptr;
	u32 *addr = (u32 *)(runtime->dma_area + offset);

	snd_assert(count % 4 == 0, return);

	vx2_setup_pseudo_dma(chip, 1);

	/* Transfer using pseudo-dma.
	 */
	if (offset + count > pipe->buffer_bytes) {
		int length = pipe->buffer_bytes - offset;
		count -= length;
		length >>= 2; /* in 32bit words */
		/* Transfer using pseudo-dma. */
		while (length-- > 0) {
			outl(cpu_to_le32(*addr), port);
			addr++;
		}
		addr = (u32 *)runtime->dma_area;
		pipe->hw_ptr = 0;
	}

示例#2

文件： vx222_ops.c 项目： MiniBlu/cm11_kernel_htc_msm8974a3ul

static void vx2_dma_write(struct vx_core *chip, struct snd_pcm_runtime *runtime,
			  struct vx_pipe *pipe, int count)
{
	unsigned long port = vx2_reg_addr(chip, VX_DMA);
	int offset = pipe->hw_ptr;
	u32 *addr = (u32 *)(runtime->dma_area + offset);

	if (snd_BUG_ON(count % 4))
		return;

	vx2_setup_pseudo_dma(chip, 1);

	if (offset + count > pipe->buffer_bytes) {
		int length = pipe->buffer_bytes - offset;
		count -= length;
		length >>= 2; 
		
		while (length-- > 0) {
			outl(cpu_to_le32(*addr), port);
			addr++;
		}
		addr = (u32 *)runtime->dma_area;
		pipe->hw_ptr = 0;
	}