C++ (Cpp) tegra_uart_dma_channel_free Examples

Example #1

File: serial-tegra.c Project: Lyude/linux

static void tegra_uart_shutdown(struct uart_port *u)
{
	struct tegra_uart_port *tup = to_tegra_uport(u);

	tegra_uart_hw_deinit(tup);

	tup->rx_in_progress = 0;
	tup->tx_in_progress = 0;

	tegra_uart_dma_channel_free(tup, true);
	tegra_uart_dma_channel_free(tup, false);
	free_irq(u->irq, tup);
}

Example #2

File: serial-tegra.c Project: Toradex-Apalis-TK1-AndroidTV/android_kernel_nvidia_mm

static int tegra_uart_startup(struct uart_port *u)
{
	struct tegra_uart_port *tup = to_tegra_uport(u);
	int ret;

	ret = tegra_uart_dma_channel_allocate(tup, false);
	if (ret < 0) {
		dev_err(u->dev, "Tx Dma allocation failed, err = %d\n", ret);
		return ret;
	}

	if (!tup->use_rx_pio) {
		ret = tegra_uart_dma_channel_allocate(tup, true);
		if (ret < 0) {
			dev_err(u->dev, "Rx Dma allocation failed, err = %d\n",
					ret);
			goto fail_rx_dma;
		}
	}

	ret = tegra_uart_hw_init(tup);
	if (ret < 0) {
		dev_err(u->dev, "Uart HW init failed, err = %d\n", ret);
		goto fail_hw_init;
	}

	ret = request_irq(u->irq, tegra_uart_isr, IRQF_DISABLED,
				dev_name(u->dev), tup);
	if (ret < 0) {
		dev_err(u->dev, "Failed to register ISR for IRQ %d\n", u->irq);
		goto fail_hw_init;
	}
	return 0;

fail_hw_init:
	if (!tup->use_rx_pio)
		tegra_uart_dma_channel_free(tup, true);
fail_rx_dma:
	tegra_uart_dma_channel_free(tup, false);
	return ret;
}

Example #3

File: serial-tegra.c Project: Lyude/linux

static int tegra_uart_dma_channel_allocate(struct tegra_uart_port *tup,
			bool dma_to_memory)
{
	struct dma_chan *dma_chan;
	unsigned char *dma_buf;
	dma_addr_t dma_phys;
	int ret;
	struct dma_slave_config dma_sconfig;

	dma_chan = dma_request_slave_channel_reason(tup->uport.dev,
						dma_to_memory ? "rx" : "tx");
	if (IS_ERR(dma_chan)) {
		ret = PTR_ERR(dma_chan);
		dev_err(tup->uport.dev,
			"DMA channel alloc failed: %d\n", ret);
		return ret;
	}

	if (dma_to_memory) {
		dma_buf = dma_alloc_coherent(tup->uport.dev,
				TEGRA_UART_RX_DMA_BUFFER_SIZE,
				 &dma_phys, GFP_KERNEL);
		if (!dma_buf) {
			dev_err(tup->uport.dev,
				"Not able to allocate the dma buffer\n");
			dma_release_channel(dma_chan);
			return -ENOMEM;
		}
		dma_sconfig.src_addr = tup->uport.mapbase;
		dma_sconfig.src_addr_width = DMA_SLAVE_BUSWIDTH_1_BYTE;
		dma_sconfig.src_maxburst = 4;
		tup->rx_dma_chan = dma_chan;
		tup->rx_dma_buf_virt = dma_buf;
		tup->rx_dma_buf_phys = dma_phys;
	} else {
		dma_phys = dma_map_single(tup->uport.dev,
			tup->uport.state->xmit.buf, UART_XMIT_SIZE,
			DMA_TO_DEVICE);
		if (dma_mapping_error(tup->uport.dev, dma_phys)) {
			dev_err(tup->uport.dev, "dma_map_single tx failed\n");
			dma_release_channel(dma_chan);
			return -ENOMEM;
		}
		dma_buf = tup->uport.state->xmit.buf;
		dma_sconfig.dst_addr = tup->uport.mapbase;
		dma_sconfig.dst_addr_width = DMA_SLAVE_BUSWIDTH_1_BYTE;
		dma_sconfig.dst_maxburst = 16;
		tup->tx_dma_chan = dma_chan;
		tup->tx_dma_buf_virt = dma_buf;
		tup->tx_dma_buf_phys = dma_phys;
	}

	ret = dmaengine_slave_config(dma_chan, &dma_sconfig);
	if (ret < 0) {
		dev_err(tup->uport.dev,
			"Dma slave config failed, err = %d\n", ret);
		tegra_uart_dma_channel_free(tup, dma_to_memory);
		return ret;
	}

	return 0;
}