From 33d64c4ffab7da36d657a35fe2b494d5c971f615 Mon Sep 17 00:00:00 2001 From: Elen Song Date: Mon, 22 Jul 2013 16:30:28 +0800 Subject: [PATCH] serial: at91: support run time switch transfer mode We will switch to pio mode when request of dma or pdc fail. But soon or later, when the request is success, the transfer mode can switch to them at next open serial port action. So in startup stage, we should get original transfer mode. Signed-off-by: Elen Song Signed-off-by: Greg Kroah-Hartman --- drivers/tty/serial/atmel_serial.c | 139 +++++++++++++++++------------- 1 file changed, 80 insertions(+), 59 deletions(-) diff --git a/drivers/tty/serial/atmel_serial.c b/drivers/tty/serial/atmel_serial.c index eaf7dc7795b8..1db68713d656 100644 --- a/drivers/tty/serial/atmel_serial.c +++ b/drivers/tty/serial/atmel_serial.c @@ -1370,6 +1370,80 @@ static void atmel_tasklet_func(unsigned long data) spin_unlock(&port->lock); } +static int atmel_init_property(struct atmel_uart_port *atmel_port, + struct platform_device *pdev) +{ + struct device_node *np = pdev->dev.of_node; + struct atmel_uart_data *pdata = pdev->dev.platform_data; + + if (np) { + /* DMA/PDC usage specification */ + if (of_get_property(np, "atmel,use-dma-rx", NULL)) { + if (of_get_property(np, "dmas", NULL)) { + atmel_port->use_dma_rx = true; + atmel_port->use_pdc_rx = false; + } else { + atmel_port->use_dma_rx = false; + atmel_port->use_pdc_rx = true; + } + } else { + atmel_port->use_dma_rx = false; + atmel_port->use_pdc_rx = false; + } + + if (of_get_property(np, "atmel,use-dma-tx", NULL)) { + if (of_get_property(np, "dmas", NULL)) { + atmel_port->use_dma_tx = true; + atmel_port->use_pdc_tx = false; + } else { + atmel_port->use_dma_tx = false; + atmel_port->use_pdc_tx = true; + } + } else { + atmel_port->use_dma_tx = false; + atmel_port->use_pdc_tx = false; + } + + } else { + atmel_port->use_pdc_rx = pdata->use_dma_rx; + atmel_port->use_pdc_tx = pdata->use_dma_tx; + atmel_port->use_dma_rx = false; + atmel_port->use_dma_tx = false; + } + + return 0; +} + +static void atmel_init_rs485(struct atmel_uart_port *atmel_port, + struct platform_device *pdev) +{ + struct device_node *np = pdev->dev.of_node; + struct atmel_uart_data *pdata = pdev->dev.platform_data; + + if (np) { + u32 rs485_delay[2]; + /* rs485 properties */ + if (of_property_read_u32_array(np, "rs485-rts-delay", + rs485_delay, 2) == 0) { + struct serial_rs485 *rs485conf = &atmel_port->rs485; + + rs485conf->delay_rts_before_send = rs485_delay[0]; + rs485conf->delay_rts_after_send = rs485_delay[1]; + rs485conf->flags = 0; + + if (of_get_property(np, "rs485-rx-during-tx", NULL)) + rs485conf->flags |= SER_RS485_RX_DURING_TX; + + if (of_get_property(np, "linux,rs485-enabled-at-boot-time", + NULL)) + rs485conf->flags |= SER_RS485_ENABLED; + } + } else { + atmel_port->rs485 = pdata->rs485; + } + +} + static void atmel_set_ops(struct uart_port *port) { struct atmel_uart_port *atmel_port = to_atmel_uart_port(port); @@ -1408,6 +1482,7 @@ static void atmel_set_ops(struct uart_port *port) */ static int atmel_startup(struct uart_port *port) { + struct platform_device *pdev = to_platform_device(port->dev); struct atmel_uart_port *atmel_port = to_atmel_uart_port(port); struct tty_struct *tty = port->state->port.tty; int retval; @@ -1432,6 +1507,8 @@ static int atmel_startup(struct uart_port *port) /* * Initialize DMA (if necessary) */ + atmel_init_property(atmel_port, pdev); + if (atmel_port->prepare_rx) { retval = atmel_port->prepare_rx(port); if (retval < 0) @@ -1877,55 +1954,6 @@ static struct uart_ops atmel_pops = { #endif }; -static void atmel_of_init_port(struct atmel_uart_port *atmel_port, - struct device_node *np) -{ - u32 rs485_delay[2]; - - /* DMA/PDC usage specification */ - if (of_get_property(np, "atmel,use-dma-rx", NULL)) { - if (of_get_property(np, "dmas", NULL)) { - atmel_port->use_dma_rx = true; - atmel_port->use_pdc_rx = false; - } else { - atmel_port->use_dma_rx = false; - atmel_port->use_pdc_rx = true; - } - } else { - atmel_port->use_dma_rx = false; - atmel_port->use_pdc_rx = false; - } - - if (of_get_property(np, "atmel,use-dma-tx", NULL)) { - if (of_get_property(np, "dmas", NULL)) { - atmel_port->use_dma_tx = true; - atmel_port->use_pdc_tx = false; - } else { - atmel_port->use_dma_tx = false; - atmel_port->use_pdc_tx = true; - } - } else { - atmel_port->use_dma_tx = false; - atmel_port->use_pdc_tx = false; - } - - /* rs485 properties */ - if (of_property_read_u32_array(np, "rs485-rts-delay", - rs485_delay, 2) == 0) { - struct serial_rs485 *rs485conf = &atmel_port->rs485; - - rs485conf->delay_rts_before_send = rs485_delay[0]; - rs485conf->delay_rts_after_send = rs485_delay[1]; - rs485conf->flags = 0; - - if (of_get_property(np, "rs485-rx-during-tx", NULL)) - rs485conf->flags |= SER_RS485_RX_DURING_TX; - - if (of_get_property(np, "linux,rs485-enabled-at-boot-time", NULL)) - rs485conf->flags |= SER_RS485_ENABLED; - } -} - /* * Configure the port from the platform device resource info. */ @@ -1936,17 +1964,10 @@ static int atmel_init_port(struct atmel_uart_port *atmel_port, struct uart_port *port = &atmel_port->uart; struct atmel_uart_data *pdata = pdev->dev.platform_data; - if (pdev->dev.of_node) { - atmel_of_init_port(atmel_port, pdev->dev.of_node); - } else { - atmel_port->use_pdc_rx = pdata->use_dma_rx; - atmel_port->use_pdc_tx = pdata->use_dma_tx; - atmel_port->use_dma_rx = false; - atmel_port->use_dma_tx = false; - atmel_port->rs485 = pdata->rs485; - } + if (!atmel_init_property(atmel_port, pdev)) + atmel_set_ops(port); - atmel_set_ops(port); + atmel_init_rs485(atmel_port, pdev); port->iotype = UPIO_MEM; port->flags = UPF_BOOT_AUTOCONF; -- 2.20.1