diff options
Diffstat (limited to 'drivers/tty/serial/serial-tegra.c')
| -rw-r--r-- | drivers/tty/serial/serial-tegra.c | 44 |
1 files changed, 20 insertions, 24 deletions
diff --git a/drivers/tty/serial/serial-tegra.c b/drivers/tty/serial/serial-tegra.c index d0d972f7e43..d5c2a287b7e 100644 --- a/drivers/tty/serial/serial-tegra.c +++ b/drivers/tty/serial/serial-tegra.c @@ -34,6 +34,7 @@ #include <linux/of_device.h> #include <linux/pagemap.h> #include <linux/platform_device.h> +#include <linux/reset.h> #include <linux/serial.h> #include <linux/serial_8250.h> #include <linux/serial_core.h> @@ -44,8 +45,6 @@ #include <linux/tty.h> #include <linux/tty_flip.h> -#include <linux/clk/tegra.h> - #define TEGRA_UART_TYPE "TEGRA_UART" #define TX_EMPTY_STATUS (UART_LSR_TEMT | UART_LSR_THRE) #define BYTES_TO_ALIGN(x) ((unsigned long)(x) & 0x3) @@ -103,6 +102,7 @@ struct tegra_uart_port { const struct tegra_uart_chip_data *cdata; struct clk *uart_clk; + struct reset_control *rst; unsigned int current_baud; /* Register shadow */ @@ -120,7 +120,6 @@ struct tegra_uart_port { bool rx_timeout; int rx_in_progress; int symb_bit; - int dma_req_sel; struct dma_chan *rx_dma_chan; struct dma_chan *tx_dma_chan; @@ -732,7 +731,7 @@ static irqreturn_t tegra_uart_isr(int irq, void *data) static void tegra_uart_stop_rx(struct uart_port *u) { struct tegra_uart_port *tup = to_tegra_uport(u); - struct tty_struct *tty = tty_port_tty_get(&tup->uport.state->port); + struct tty_struct *tty; struct tty_port *port = &u->state->port; struct dma_tx_state state; unsigned long ier; @@ -744,6 +743,8 @@ static void tegra_uart_stop_rx(struct uart_port *u) if (!tup->rx_in_progress) return; + tty = tty_port_tty_get(&tup->uport.state->port); + tegra_uart_wait_sym_time(tup, 1); /* wait a character interval */ ier = tup->ier_shadow; @@ -830,9 +831,9 @@ static int tegra_uart_hw_init(struct tegra_uart_port *tup) clk_prepare_enable(tup->uart_clk); /* Reset the UART controller to clear all previous status.*/ - tegra_periph_reset_assert(tup->uart_clk); + reset_control_assert(tup->rst); udelay(10); - tegra_periph_reset_deassert(tup->uart_clk); + reset_control_deassert(tup->rst); tup->rx_in_progress = 0; tup->tx_in_progress = 0; @@ -908,15 +909,14 @@ static int tegra_uart_dma_channel_allocate(struct tegra_uart_port *tup, dma_addr_t dma_phys; int ret; struct dma_slave_config dma_sconfig; - dma_cap_mask_t mask; - dma_cap_zero(mask); - dma_cap_set(DMA_SLAVE, mask); - dma_chan = dma_request_channel(mask, NULL, NULL); - if (!dma_chan) { + 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 is not available, will try later\n"); - return -EPROBE_DEFER; + "DMA channel alloc failed: %d\n", ret); + return ret; } if (dma_to_memory) { @@ -936,7 +936,6 @@ static int tegra_uart_dma_channel_allocate(struct tegra_uart_port *tup, dma_buf = tup->uport.state->xmit.buf; } - dma_sconfig.slave_id = tup->dma_req_sel; if (dma_to_memory) { dma_sconfig.src_addr = tup->uport.mapbase; dma_sconfig.src_addr_width = DMA_SLAVE_BUSWIDTH_1_BYTE; @@ -1016,7 +1015,7 @@ static int tegra_uart_startup(struct uart_port *u) goto fail_hw_init; } - ret = request_irq(u->irq, tegra_uart_isr, IRQF_DISABLED, + ret = request_irq(u->irq, tegra_uart_isr, 0, dev_name(u->dev), tup); if (ret < 0) { dev_err(u->dev, "Failed to register ISR for IRQ %d\n", u->irq); @@ -1220,17 +1219,8 @@ static int tegra_uart_parse_dt(struct platform_device *pdev, struct tegra_uart_port *tup) { struct device_node *np = pdev->dev.of_node; - u32 of_dma[2]; int port; - if (of_property_read_u32_array(np, "nvidia,dma-request-selector", - of_dma, 2) >= 0) { - tup->dma_req_sel = of_dma[1]; - } else { - dev_err(&pdev->dev, "missing dma requestor in device tree\n"); - return -EINVAL; - } - port = of_alias_get_id(np, "serial"); if (port < 0) { dev_err(&pdev->dev, "failed to get alias id, errno %d\n", port); @@ -1318,6 +1308,12 @@ static int tegra_uart_probe(struct platform_device *pdev) return PTR_ERR(tup->uart_clk); } + tup->rst = devm_reset_control_get(&pdev->dev, "serial"); + if (IS_ERR(tup->rst)) { + dev_err(&pdev->dev, "Couldn't get the reset\n"); + return PTR_ERR(tup->rst); + } + u->iotype = UPIO_MEM32; u->irq = platform_get_irq(pdev, 0); u->regshift = 2; |