From 5fbe46b67680c27aeb56228dab8cfe25f8f8f83d Mon Sep 17 00:00:00 2001 From: Nicolas Ferre Date: Wed, 12 Oct 2011 18:07:00 +0200 Subject: [PATCH] tty/serial: atmel_serial: add device tree support Will use aliases to enumerate ports, if available. Signed-off-by: Nicolas Ferre Acked-by: Grant Likely Signed-off-by: Greg Kroah-Hartman --- drivers/tty/serial/atmel_serial.c | 79 +++++++++++++++++++++++++++++++++++---- 1 file changed, 71 insertions(+), 8 deletions(-) diff --git a/drivers/tty/serial/atmel_serial.c b/drivers/tty/serial/atmel_serial.c index 10743297a00..fc4081ead72 100644 --- a/drivers/tty/serial/atmel_serial.c +++ b/drivers/tty/serial/atmel_serial.c @@ -33,6 +33,8 @@ #include #include #include +#include +#include #include #include #include @@ -163,6 +165,16 @@ static unsigned long atmel_ports_in_use; static struct console atmel_console; #endif +#if defined(CONFIG_OF) +static const struct of_device_id atmel_serial_dt_ids[] = { + { .compatible = "atmel,at91rm9200-usart" }, + { .compatible = "atmel,at91sam9260-usart" }, + { /* sentinel */ } +}; + +MODULE_DEVICE_TABLE(of, atmel_serial_dt_ids); +#endif + static inline struct atmel_uart_port * to_atmel_uart_port(struct uart_port *uart) { @@ -1411,6 +1423,48 @@ static struct uart_ops atmel_pops = { #endif }; +static void __devinit 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)) + atmel_port->use_dma_rx = 1; + else + atmel_port->use_dma_rx = 0; + if (of_get_property(np, "atmel,use-dma-tx", NULL)) + atmel_port->use_dma_tx = 1; + else + atmel_port->use_dma_tx = 0; + + /* 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 (rs485conf->delay_rts_before_send == 0 && + rs485conf->delay_rts_after_send == 0) { + rs485conf->flags |= SER_RS485_RTS_ON_SEND; + } else { + if (rs485conf->delay_rts_before_send) + rs485conf->flags |= SER_RS485_RTS_BEFORE_SEND; + if (rs485conf->delay_rts_after_send) + rs485conf->flags |= SER_RS485_RTS_AFTER_SEND; + } + + 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. */ @@ -1420,6 +1474,14 @@ static void __devinit 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_dma_rx = pdata->use_dma_rx; + atmel_port->use_dma_tx = pdata->use_dma_tx; + atmel_port->rs485 = pdata->rs485; + } + port->iotype = UPIO_MEM; port->flags = UPF_BOOT_AUTOCONF; port->ops = &atmel_pops; @@ -1433,7 +1495,7 @@ static void __devinit atmel_init_port(struct atmel_uart_port *atmel_port, memset(&atmel_port->rx_ring, 0, sizeof(atmel_port->rx_ring)); - if (pdata->regs) { + if (pdata && pdata->regs) { /* Already mapped by setup code */ port->membase = pdata->regs; } else { @@ -1450,10 +1512,6 @@ static void __devinit atmel_init_port(struct atmel_uart_port *atmel_port, /* only enable clock when USART is in use */ } - atmel_port->use_dma_rx = pdata->use_dma_rx; - atmel_port->use_dma_tx = pdata->use_dma_tx; - atmel_port->rs485 = pdata->rs485; - /* Use TXEMPTY for interrupt when rs485 else TXRDY or ENDTX|TXBUFE */ if (atmel_port->rs485.flags & SER_RS485_ENABLED) atmel_port->tx_done_mask = ATMEL_US_TXEMPTY; @@ -1718,17 +1776,21 @@ static int atmel_serial_resume(struct platform_device *pdev) static int __devinit atmel_serial_probe(struct platform_device *pdev) { struct atmel_uart_port *port; + struct device_node *np = pdev->dev.of_node; struct atmel_uart_data *pdata = pdev->dev.platform_data; void *data; int ret = -ENODEV; BUILD_BUG_ON(ATMEL_SERIAL_RINGSIZE & (ATMEL_SERIAL_RINGSIZE - 1)); - if (pdata) - ret = pdata->num; + if (np) + ret = of_alias_get_id(np, "serial"); + else + if (pdata) + ret = pdata->num; if (ret < 0) - /* port id not found in platform data: + /* port id not found in platform data nor device-tree aliases: * auto-enumerate it */ ret = find_first_zero_bit(&atmel_ports_in_use, sizeof(atmel_ports_in_use)); @@ -1827,6 +1889,7 @@ static struct platform_driver atmel_serial_driver = { .driver = { .name = "atmel_usart", .owner = THIS_MODULE, + .of_match_table = of_match_ptr(atmel_serial_dt_ids), }, }; -- 2.11.4.GIT