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| author | Elen Song <elen.song@atmel.com> | 2013-07-22 16:30:29 +0800 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2013-07-29 13:04:12 -0700 |
| commit | 055560b04a8cd063aea916fd083b7aec02c2adb8 (patch) | |
| tree | 9ab27afe910729ddfd1eb45c5ceff766424126bf /drivers/tty/serial/atmel_serial.c | |
| parent | 33d64c4ffab7da36d657a35fe2b494d5c971f615 (diff) | |
| download | blackbird-op-linux-055560b04a8cd063aea916fd083b7aec02c2adb8.tar.gz blackbird-op-linux-055560b04a8cd063aea916fd083b7aec02c2adb8.zip | |
serial: at91: distinguish usart and uart
Distinguish usart and uart by read ip name register,
The usart read name is "USAR",
The uart and dbgu read name is "DBGU".
Signed-off-by: Elen Song <elen.song@atmel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'drivers/tty/serial/atmel_serial.c')
| -rw-r--r-- | drivers/tty/serial/atmel_serial.c | 37 |
1 files changed, 37 insertions, 0 deletions
diff --git a/drivers/tty/serial/atmel_serial.c b/drivers/tty/serial/atmel_serial.c index 1db68713d656..8dbc3e67dfa4 100644 --- a/drivers/tty/serial/atmel_serial.c +++ b/drivers/tty/serial/atmel_serial.c @@ -97,6 +97,7 @@ static void atmel_stop_rx(struct uart_port *port); #define UART_PUT_BRGR(port,v) __raw_writel(v, (port)->membase + ATMEL_US_BRGR) #define UART_PUT_RTOR(port,v) __raw_writel(v, (port)->membase + ATMEL_US_RTOR) #define UART_PUT_TTGR(port, v) __raw_writel(v, (port)->membase + ATMEL_US_TTGR) +#define UART_GET_IP_NAME(port) __raw_readl((port)->membase + ATMEL_US_NAME) /* PDC registers */ #define UART_PUT_PTCR(port,v) __raw_writel(v, (port)->membase + ATMEL_PDC_PTCR) @@ -166,6 +167,7 @@ struct atmel_uart_port { struct serial_rs485 rs485; /* rs485 settings */ unsigned int tx_done_mask; + bool is_usart; /* usart or uart */ int (*prepare_rx)(struct uart_port *port); int (*prepare_tx)(struct uart_port *port); void (*schedule_rx)(struct uart_port *port); @@ -1478,6 +1480,34 @@ static void atmel_set_ops(struct uart_port *port) } /* + * Get ip name usart or uart + */ +static int atmel_get_ip_name(struct uart_port *port) +{ + struct atmel_uart_port *atmel_port = to_atmel_uart_port(port); + int name = UART_GET_IP_NAME(port); + int usart, uart; + /* usart and uart ascii */ + usart = 0x55534152; + uart = 0x44424755; + + atmel_port->is_usart = false; + + if (name == usart) { + dev_dbg(port->dev, "This is usart\n"); + atmel_port->is_usart = true; + } else if (name == uart) { + dev_dbg(port->dev, "This is uart\n"); + atmel_port->is_usart = false; + } else { + dev_err(port->dev, "Not supported ip name, set to uart\n"); + return -EINVAL; + } + + return 0; +} + +/* * Perform initialization and enable port for reception */ static int atmel_startup(struct uart_port *port) @@ -2336,6 +2366,13 @@ static int atmel_serial_probe(struct platform_device *pdev) UART_PUT_CR(&port->uart, ATMEL_US_RTSEN); } + /* + * Get port name of usart or uart + */ + ret = atmel_get_ip_name(&port->uart); + if (ret < 0) + goto err_add_port; + return 0; err_add_port: |
