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 <elen.song@atmel.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
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@ -1370,6 +1370,80 @@ static void atmel_tasklet_func(unsigned long data)
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spin_unlock(&port->lock);
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}
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static int atmel_init_property(struct atmel_uart_port *atmel_port,
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struct platform_device *pdev)
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{
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struct device_node *np = pdev->dev.of_node;
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struct atmel_uart_data *pdata = pdev->dev.platform_data;
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if (np) {
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/* DMA/PDC usage specification */
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if (of_get_property(np, "atmel,use-dma-rx", NULL)) {
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if (of_get_property(np, "dmas", NULL)) {
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atmel_port->use_dma_rx = true;
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atmel_port->use_pdc_rx = false;
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} else {
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atmel_port->use_dma_rx = false;
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atmel_port->use_pdc_rx = true;
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}
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} else {
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atmel_port->use_dma_rx = false;
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atmel_port->use_pdc_rx = false;
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}
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if (of_get_property(np, "atmel,use-dma-tx", NULL)) {
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if (of_get_property(np, "dmas", NULL)) {
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atmel_port->use_dma_tx = true;
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atmel_port->use_pdc_tx = false;
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} else {
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atmel_port->use_dma_tx = false;
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atmel_port->use_pdc_tx = true;
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}
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} else {
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atmel_port->use_dma_tx = false;
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atmel_port->use_pdc_tx = false;
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}
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} else {
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atmel_port->use_pdc_rx = pdata->use_dma_rx;
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atmel_port->use_pdc_tx = pdata->use_dma_tx;
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atmel_port->use_dma_rx = false;
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atmel_port->use_dma_tx = false;
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}
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return 0;
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}
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static void atmel_init_rs485(struct atmel_uart_port *atmel_port,
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struct platform_device *pdev)
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{
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struct device_node *np = pdev->dev.of_node;
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struct atmel_uart_data *pdata = pdev->dev.platform_data;
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if (np) {
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u32 rs485_delay[2];
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/* rs485 properties */
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if (of_property_read_u32_array(np, "rs485-rts-delay",
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rs485_delay, 2) == 0) {
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struct serial_rs485 *rs485conf = &atmel_port->rs485;
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rs485conf->delay_rts_before_send = rs485_delay[0];
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rs485conf->delay_rts_after_send = rs485_delay[1];
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rs485conf->flags = 0;
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if (of_get_property(np, "rs485-rx-during-tx", NULL))
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rs485conf->flags |= SER_RS485_RX_DURING_TX;
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if (of_get_property(np, "linux,rs485-enabled-at-boot-time",
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NULL))
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rs485conf->flags |= SER_RS485_ENABLED;
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}
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} else {
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atmel_port->rs485 = pdata->rs485;
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}
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}
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static void atmel_set_ops(struct uart_port *port)
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{
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struct atmel_uart_port *atmel_port = to_atmel_uart_port(port);
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@ -1408,6 +1482,7 @@ static void atmel_set_ops(struct uart_port *port)
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*/
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static int atmel_startup(struct uart_port *port)
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{
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struct platform_device *pdev = to_platform_device(port->dev);
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struct atmel_uart_port *atmel_port = to_atmel_uart_port(port);
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struct tty_struct *tty = port->state->port.tty;
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int retval;
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@ -1432,6 +1507,8 @@ static int atmel_startup(struct uart_port *port)
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/*
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* Initialize DMA (if necessary)
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*/
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atmel_init_property(atmel_port, pdev);
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if (atmel_port->prepare_rx) {
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retval = atmel_port->prepare_rx(port);
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if (retval < 0)
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@ -1877,55 +1954,6 @@ static struct uart_ops atmel_pops = {
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#endif
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};
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static void atmel_of_init_port(struct atmel_uart_port *atmel_port,
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struct device_node *np)
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{
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u32 rs485_delay[2];
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/* DMA/PDC usage specification */
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if (of_get_property(np, "atmel,use-dma-rx", NULL)) {
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if (of_get_property(np, "dmas", NULL)) {
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atmel_port->use_dma_rx = true;
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atmel_port->use_pdc_rx = false;
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} else {
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atmel_port->use_dma_rx = false;
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atmel_port->use_pdc_rx = true;
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}
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} else {
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atmel_port->use_dma_rx = false;
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atmel_port->use_pdc_rx = false;
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}
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if (of_get_property(np, "atmel,use-dma-tx", NULL)) {
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if (of_get_property(np, "dmas", NULL)) {
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atmel_port->use_dma_tx = true;
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atmel_port->use_pdc_tx = false;
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} else {
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atmel_port->use_dma_tx = false;
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atmel_port->use_pdc_tx = true;
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}
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} else {
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atmel_port->use_dma_tx = false;
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atmel_port->use_pdc_tx = false;
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}
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/* rs485 properties */
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if (of_property_read_u32_array(np, "rs485-rts-delay",
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rs485_delay, 2) == 0) {
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struct serial_rs485 *rs485conf = &atmel_port->rs485;
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rs485conf->delay_rts_before_send = rs485_delay[0];
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rs485conf->delay_rts_after_send = rs485_delay[1];
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rs485conf->flags = 0;
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if (of_get_property(np, "rs485-rx-during-tx", NULL))
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rs485conf->flags |= SER_RS485_RX_DURING_TX;
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if (of_get_property(np, "linux,rs485-enabled-at-boot-time", NULL))
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rs485conf->flags |= SER_RS485_ENABLED;
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}
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}
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/*
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* Configure the port from the platform device resource info.
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*/
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@ -1936,17 +1964,10 @@ static int atmel_init_port(struct atmel_uart_port *atmel_port,
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struct uart_port *port = &atmel_port->uart;
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struct atmel_uart_data *pdata = pdev->dev.platform_data;
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if (pdev->dev.of_node) {
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atmel_of_init_port(atmel_port, pdev->dev.of_node);
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} else {
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atmel_port->use_pdc_rx = pdata->use_dma_rx;
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atmel_port->use_pdc_tx = pdata->use_dma_tx;
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atmel_port->use_dma_rx = false;
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atmel_port->use_dma_tx = false;
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atmel_port->rs485 = pdata->rs485;
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}
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if (!atmel_init_property(atmel_port, pdev))
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atmel_set_ops(port);
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atmel_set_ops(port);
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atmel_init_rs485(atmel_port, pdev);
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port->iotype = UPIO_MEM;
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port->flags = UPF_BOOT_AUTOCONF;
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