C++ (Cpp) sdma_run_channel示例

示例#1

文件： imx-sdma.c 项目： boseji/kernel_imx

static int sdma_load_script(struct sdma_engine *sdma, void *buf, int size,
		u32 address)
{
	struct sdma_buffer_descriptor *bd0 = sdma->channel[0].bd;
	void *buf_virt;
	dma_addr_t buf_phys;
	int ret;

	buf_virt = dma_alloc_coherent(NULL,
			size,
			&buf_phys, GFP_KERNEL);
	if (!buf_virt)
		return -ENOMEM;

	bd0->mode.command = C0_SETPM;
	bd0->mode.status = BD_DONE | BD_INTR | BD_WRAP | BD_EXTD;
	bd0->mode.count = size / 2;
	bd0->buffer_addr = buf_phys;
	bd0->ext_buffer_addr = address;

	memcpy(buf_virt, buf, size);

	ret = sdma_run_channel(&sdma->channel[0]);

	dma_free_coherent(NULL, size, buf_virt, buf_phys);

	return ret;
}

示例#2

文件： imx-sdma.c 项目： brunotl/kernel-kobo-mx6sl-ntx

static int sdma_load_context(struct sdma_channel *sdmac)
{
	struct sdma_engine *sdma = sdmac->sdma;
	int channel = sdmac->channel;
	int load_address;
	struct sdma_context_data *context = sdma->context;
	struct sdma_buffer_descriptor *bd0 = sdma->channel[0].bd;
	int ret;
	unsigned long flags;


	if (sdmac->direction == DMA_DEV_TO_MEM)
		load_address = sdmac->pc_from_device;
	else if (sdmac->direction == DMA_DEV_TO_DEV)
		load_address = sdmac->device_to_device;
	else if (sdmac->direction == DMA_MEM_TO_DEV)
		load_address = sdmac->pc_to_device;
	else if (sdmac->direction == DMA_MEM_TO_MEM)
		load_address = sdmac->pc_to_pc;
	else
		load_address = sdmac->other_script;


	if (load_address < 0)
		return load_address;

	dev_dbg(sdma->dev, "load_address = %d\n", load_address);
	dev_dbg(sdma->dev, "wml = 0x%08x\n", sdmac->watermark_level);
	dev_dbg(sdma->dev, "shp_addr = 0x%08x\n", sdmac->shp_addr);
	dev_dbg(sdma->dev, "per_addr = 0x%08x\n", sdmac->per_addr);
	dev_dbg(sdma->dev, "event_mask0 = 0x%08x\n", sdmac->event_mask0);
	dev_dbg(sdma->dev, "event_mask1 = 0x%08x\n", sdmac->event_mask1);

	spin_lock_irqsave(&sdma->channel_0_lock, flags);
	memset(context, 0, sizeof(*context));
	context->channel_state.pc = load_address;

	/* Send by context the event mask,base address for peripheral
	 * and watermark level
	 */
	sdma_set_context_reg(sdmac, context);

	bd0->mode.command = C0_SETDM;
	bd0->mode.status = BD_DONE | BD_INTR | BD_WRAP | BD_EXTD;
	bd0->mode.count = sizeof(*context) / 4;
	bd0->buffer_addr = sdma->context_phys;
	bd0->ext_buffer_addr = 2048 + (sizeof(*context) / 4) * channel;

	ret = sdma_run_channel(&sdma->channel[0]);

	spin_unlock_irqrestore(&sdma->channel_0_lock, flags);
	return ret;
}

示例#3

文件： imx-sdma.c 项目： silentsight/linux-shortbus

static int sdma_load_context(struct sdma_channel *sdmac)
{
	struct sdma_engine *sdma = sdmac->sdma;
	int channel = sdmac->channel;
	int load_address;
	struct sdma_context_data *context = sdma->context;
	struct sdma_buffer_descriptor *bd0 = sdma->channel[0].bd;
	int ret;

	if (sdmac->direction == DMA_FROM_DEVICE) {
		load_address = sdmac->pc_from_device;
	} else {
		load_address = sdmac->pc_to_device;
	}

	if (load_address < 0)
		return load_address;

	dev_dbg(sdma->dev, "load_address = %d\n", load_address);
	dev_dbg(sdma->dev, "wml = 0x%08x\n", sdmac->watermark_level);
	dev_dbg(sdma->dev, "shp_addr = 0x%08x\n", sdmac->shp_addr);
	dev_dbg(sdma->dev, "per_addr = 0x%08x\n", sdmac->per_addr);
	dev_dbg(sdma->dev, "event_mask0 = 0x%08x\n", sdmac->event_mask0);
	dev_dbg(sdma->dev, "event_mask1 = 0x%08x\n", sdmac->event_mask1);

	memset(context, 0, sizeof(*context));
	context->channel_state.pc = load_address;

	/* Send by context the event mask,base address for peripheral
	 * and watermark level
	 */
	context->gReg[0] = sdmac->event_mask1;
	context->gReg[1] = sdmac->event_mask0;
	context->gReg[2] = sdmac->per_addr;
	context->gReg[6] = sdmac->shp_addr;
	context->gReg[7] = sdmac->watermark_level;

	bd0->mode.command = C0_SETDM;
	bd0->mode.status = BD_DONE | BD_INTR | BD_WRAP | BD_EXTD;
	bd0->mode.count = sizeof(*context) / 4;
	bd0->buffer_addr = sdma->context_phys;
	bd0->ext_buffer_addr = 2048 + (sizeof(*context) / 4) * channel;

	ret = sdma_run_channel(&sdma->channel[0]);

	return ret;
}

示例#4

文件： imx-sdma.c 项目： brunotl/kernel-kobo-mx6sl-ntx

static int sdma_load_script(struct sdma_engine *sdma, void *buf, int size,
		u32 address)
{
	struct sdma_buffer_descriptor *bd0 = sdma->channel[0].bd;
	void *buf_virt;
	dma_addr_t buf_phys;
	unsigned long flags;
	int ret;

#ifdef CONFIG_SDMA_IRAM
	buf_virt = sdma_iram_malloc(size, (unsigned long)&buf_phys);
#else
	buf_virt = dma_alloc_coherent(NULL,
			size,
			&buf_phys, GFP_KERNEL);
#endif
	if (!buf_virt)
		return -ENOMEM;

	spin_lock_irqsave(&sdma->channel_0_lock, flags);

	bd0->mode.command = C0_SETPM;
	bd0->mode.status = BD_DONE | BD_INTR | BD_WRAP | BD_EXTD;
	bd0->mode.count = size / 2;
	bd0->buffer_addr = buf_phys;
	bd0->ext_buffer_addr = address;

	memcpy(buf_virt, buf, size);

	ret = sdma_run_channel(&sdma->channel[0]);

	spin_unlock_irqrestore(&sdma->channel_0_lock, flags);
#ifdef CONFIG_SDMA_IRAM
	sdma_iram_free(buf_phys, size);
#else
	dma_free_coherent(NULL, size, buf_virt, buf_phys);
#endif

	return ret;
}