diff options
Diffstat (limited to 'drivers/tty/serial/atmel_serial.c')
| -rw-r--r-- | drivers/tty/serial/atmel_serial.c | 77 |
1 files changed, 33 insertions, 44 deletions
diff --git a/drivers/tty/serial/atmel_serial.c b/drivers/tty/serial/atmel_serial.c index a49f10d269b2..53eeea13ff16 100644 --- a/drivers/tty/serial/atmel_serial.c +++ b/drivers/tty/serial/atmel_serial.c @@ -35,21 +35,18 @@ #include <linux/platform_device.h> #include <linux/of.h> #include <linux/of_device.h> +#include <linux/of_gpio.h> #include <linux/dma-mapping.h> #include <linux/atmel_pdc.h> #include <linux/atmel_serial.h> #include <linux/uaccess.h> #include <linux/platform_data/atmel.h> #include <linux/timer.h> +#include <linux/gpio.h> #include <asm/io.h> #include <asm/ioctls.h> -#ifdef CONFIG_ARM -#include <mach/cpu.h> -#include <asm/gpio.h> -#endif - #define PDC_BUFFER_SIZE 512 /* Revisit: We should calculate this based on the actual port settings */ #define PDC_RX_TIMEOUT (3 * 10) /* 3 bytes */ @@ -115,9 +112,6 @@ static void atmel_stop_rx(struct uart_port *port); #define UART_PUT_TCR(port,v) __raw_writel(v, (port)->membase + ATMEL_PDC_TCR) #define UART_GET_TCR(port) __raw_readl((port)->membase + ATMEL_PDC_TCR) -static int (*atmel_open_hook)(struct uart_port *); -static void (*atmel_close_hook)(struct uart_port *); - struct atmel_dma_buffer { unsigned char *buf; dma_addr_t dma_addr; @@ -168,6 +162,7 @@ struct atmel_uart_port { struct circ_buf rx_ring; struct serial_rs485 rs485; /* rs485 settings */ + int rts_gpio; /* optional RTS GPIO */ unsigned int tx_done_mask; bool is_usart; /* usart or uart */ struct timer_list uart_timer; /* uart timer */ @@ -301,20 +296,16 @@ static void atmel_set_mctrl(struct uart_port *port, u_int mctrl) unsigned int mode; struct atmel_uart_port *atmel_port = to_atmel_uart_port(port); -#ifdef CONFIG_ARCH_AT91RM9200 - if (cpu_is_at91rm9200()) { - /* - * AT91RM9200 Errata #39: RTS0 is not internally connected - * to PA21. We need to drive the pin manually. - */ - if (port->mapbase == AT91RM9200_BASE_US0) { - if (mctrl & TIOCM_RTS) - at91_set_gpio_value(AT91_PIN_PA21, 0); - else - at91_set_gpio_value(AT91_PIN_PA21, 1); - } + /* + * AT91RM9200 Errata #39: RTS0 is not internally connected + * to PA21. We need to drive the pin as a GPIO. + */ + if (gpio_is_valid(atmel_port->rts_gpio)) { + if (mctrl & TIOCM_RTS) + gpio_set_value(atmel_port->rts_gpio, 0); + else + gpio_set_value(atmel_port->rts_gpio, 1); } -#endif if (mctrl & TIOCM_RTS) control |= ATMEL_US_RTSEN; @@ -1555,7 +1546,7 @@ static int atmel_startup(struct uart_port *port) retval = request_irq(port->irq, atmel_interrupt, IRQF_SHARED, tty ? tty->name : "atmel_serial", port); if (retval) { - printk("atmel_serial: atmel_startup - Can't get irq\n"); + dev_err(port->dev, "atmel_startup - Can't get irq\n"); return retval; } @@ -1575,17 +1566,6 @@ static int atmel_startup(struct uart_port *port) if (retval < 0) atmel_set_ops(port); } - /* - * If there is a specific "open" function (to register - * control line interrupts) - */ - if (atmel_open_hook) { - retval = atmel_open_hook(port); - if (retval) { - free_irq(port->irq, port); - return retval; - } - } /* Save current CSR for comparison in atmel_tasklet_func() */ atmel_port->irq_status_prev = UART_GET_CSR(port); @@ -1684,13 +1664,6 @@ static void atmel_shutdown(struct uart_port *port) * Free the interrupt */ free_irq(port->irq, port); - - /* - * If there is a specific "close" function (to unregister - * control line interrupts) - */ - if (atmel_close_hook) - atmel_close_hook(port); } /* @@ -1738,7 +1711,7 @@ static void atmel_serial_pm(struct uart_port *port, unsigned int state, clk_disable_unprepare(atmel_port->clk); break; default: - printk(KERN_ERR "atmel_serial: unknown pm %d\n", state); + dev_err(port->dev, "atmel_serial: unknown pm %d\n", state); } } @@ -1853,13 +1826,10 @@ static void atmel_set_termios(struct uart_port *port, struct ktermios *termios, mode &= ~ATMEL_US_USMODE; if (atmel_port->rs485.flags & SER_RS485_ENABLED) { - dev_dbg(port->dev, "Setting UART to RS485\n"); if ((atmel_port->rs485.delay_rts_after_send) > 0) UART_PUT_TTGR(port, atmel_port->rs485.delay_rts_after_send); mode |= ATMEL_US_USMODE_RS485; - } else { - dev_dbg(port->dev, "Setting UART to RS232\n"); } /* set the parity, stop bits and data size */ @@ -2389,6 +2359,25 @@ static int atmel_serial_probe(struct platform_device *pdev) port = &atmel_ports[ret]; port->backup_imr = 0; port->uart.line = ret; + port->rts_gpio = -EINVAL; /* Invalid, zero could be valid */ + if (pdata) + port->rts_gpio = pdata->rts_gpio; + else if (np) + port->rts_gpio = of_get_named_gpio(np, "rts-gpios", 0); + + if (gpio_is_valid(port->rts_gpio)) { + ret = devm_gpio_request(&pdev->dev, port->rts_gpio, "RTS"); + if (ret) { + dev_err(&pdev->dev, "error requesting RTS GPIO\n"); + goto err; + } + /* Default to 1 as RTS is active low */ + ret = gpio_direction_output(port->rts_gpio, 1); + if (ret) { + dev_err(&pdev->dev, "error setting up RTS GPIO\n"); + goto err; + } + } ret = atmel_init_port(port, pdev); if (ret) |