diff options
Diffstat (limited to 'drivers/tty/serial/imx.c')
| -rw-r--r-- | drivers/tty/serial/imx.c | 72 |
1 files changed, 37 insertions, 35 deletions
diff --git a/drivers/tty/serial/imx.c b/drivers/tty/serial/imx.c index 33509b4beaec..9e3162bf3bd1 100644 --- a/drivers/tty/serial/imx.c +++ b/drivers/tty/serial/imx.c @@ -186,6 +186,11 @@ #define UART_NR 8 +/* RX DMA buffer periods */ +#define RX_DMA_PERIODS 4 +#define RX_BUF_SIZE (PAGE_SIZE) + + /* i.MX21 type uart runs on all i.mx except i.MX1 and i.MX6q */ enum imx_uart_type { IMX1_UART, @@ -207,9 +212,6 @@ struct imx_port { unsigned int have_rtscts:1; unsigned int have_rtsgpio:1; unsigned int dte_mode:1; - unsigned int irda_inv_rx:1; - unsigned int irda_inv_tx:1; - unsigned short trcv_delay; /* transceiver delay */ struct clk *clk_ipg; struct clk *clk_per; const struct imx_uart_data *devdata; @@ -224,6 +226,7 @@ struct imx_port { struct dma_chan *dma_chan_rx, *dma_chan_tx; struct scatterlist rx_sgl, tx_sgl[2]; void *rx_buf; + unsigned int rx_buf_size; struct circ_buf rx_ring; unsigned int rx_periods; dma_cookie_t rx_cookie; @@ -964,8 +967,6 @@ static void imx_timeout(unsigned long data) } } -#define RX_BUF_SIZE (PAGE_SIZE) - /* * There are two kinds of RX DMA interrupts(such as in the MX6Q): * [1] the RX DMA buffer is full. @@ -1048,9 +1049,6 @@ static void dma_rx_callback(void *data) } } -/* RX DMA buffer periods */ -#define RX_DMA_PERIODS 4 - static int start_rx_dma(struct imx_port *sport) { struct scatterlist *sgl = &sport->rx_sgl; @@ -1061,9 +1059,8 @@ static int start_rx_dma(struct imx_port *sport) sport->rx_ring.head = 0; sport->rx_ring.tail = 0; - sport->rx_periods = RX_DMA_PERIODS; - sg_init_one(sgl, sport->rx_buf, RX_BUF_SIZE); + sg_init_one(sgl, sport->rx_buf, sport->rx_buf_size); ret = dma_map_sg(dev, sgl, 1, DMA_FROM_DEVICE); if (ret == 0) { dev_err(dev, "DMA mapping error for RX.\n"); @@ -1174,7 +1171,7 @@ static int imx_uart_dma_init(struct imx_port *sport) goto err; } - sport->rx_buf = kzalloc(PAGE_SIZE, GFP_KERNEL); + sport->rx_buf = kzalloc(sport->rx_buf_size, GFP_KERNEL); if (!sport->rx_buf) { ret = -ENOMEM; goto err; @@ -1302,7 +1299,9 @@ static int imx_startup(struct uart_port *port) imx_enable_dma(sport); temp = readl(sport->port.membase + UCR1); - temp |= UCR1_RRDYEN | UCR1_RTSDEN | UCR1_UARTEN; + temp |= UCR1_RRDYEN | UCR1_UARTEN; + if (sport->have_rtscts) + temp |= UCR1_RTSDEN; writel(temp, sport->port.membase + UCR1); @@ -1340,29 +1339,13 @@ static int imx_startup(struct uart_port *port) imx_enable_ms(&sport->port); /* - * If the serial port is opened for reading start RX DMA immediately - * instead of waiting for RX FIFO interrupts. In our iMX53 the average - * delay for the first reception dropped from approximately 35000 - * microseconds to 1000 microseconds. + * Start RX DMA immediately instead of waiting for RX FIFO interrupts. + * In our iMX53 the average delay for the first reception dropped from + * approximately 35000 microseconds to 1000 microseconds. */ if (sport->dma_is_enabled) { - struct tty_struct *tty = sport->port.state->port.tty; - struct tty_file_private *file_priv; - int readcnt = 0; - - spin_lock(&tty->files_lock); - - if (!list_empty(&tty->tty_files)) - list_for_each_entry(file_priv, &tty->tty_files, list) - if (!(file_priv->file->f_flags & O_WRONLY)) - readcnt++; - - spin_unlock(&tty->files_lock); - - if (readcnt > 0) { - imx_disable_rx_int(sport); - start_rx_dma(sport); - } + imx_disable_rx_int(sport); + start_rx_dma(sport); } spin_unlock_irqrestore(&sport->port.lock, flags); @@ -2053,6 +2036,7 @@ static int serial_imx_probe_dt(struct imx_port *sport, { struct device_node *np = pdev->dev.of_node; int ret; + u32 dma_buf_size[2]; sport->devdata = of_device_get_match_data(&pdev->dev); if (!sport->devdata) @@ -2076,6 +2060,14 @@ static int serial_imx_probe_dt(struct imx_port *sport, if (of_get_property(np, "rts-gpios", NULL)) sport->have_rtsgpio = 1; + if (!of_property_read_u32_array(np, "fsl,dma-size", dma_buf_size, 2)) { + sport->rx_buf_size = dma_buf_size[0] * dma_buf_size[1]; + sport->rx_periods = dma_buf_size[1]; + } else { + sport->rx_buf_size = RX_BUF_SIZE; + sport->rx_periods = RX_DMA_PERIODS; + } + return 0; } #else @@ -2184,7 +2176,9 @@ static int serial_imx_probe(struct platform_device *pdev) * and DCD (when they are outputs) or enables the respective * irqs. So set this bit early, i.e. before requesting irqs. */ - writel(UFCR_DCEDTE, sport->port.membase + UFCR); + reg = readl(sport->port.membase + UFCR); + if (!(reg & UFCR_DCEDTE)) + writel(reg | UFCR_DCEDTE, sport->port.membase + UFCR); /* * Disable UCR3_RI and UCR3_DCD irqs. They are also not @@ -2195,7 +2189,15 @@ static int serial_imx_probe(struct platform_device *pdev) sport->port.membase + UCR3); } else { - writel(0, sport->port.membase + UFCR); + unsigned long ucr3 = UCR3_DSR; + + reg = readl(sport->port.membase + UFCR); + if (reg & UFCR_DCEDTE) + writel(reg & ~UFCR_DCEDTE, sport->port.membase + UFCR); + + if (!is_imx1_uart(sport)) + ucr3 |= IMX21_UCR3_RXDMUXSEL | UCR3_ADNIMP; + writel(ucr3, sport->port.membase + UCR3); } clk_disable_unprepare(sport->clk_ipg); |