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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>
This commit is contained in:
Elen Song 2013-07-22 16:30:29 +08:00 committed by Greg Kroah-Hartman
parent 33d64c4ffa
commit 055560b04a
2 changed files with 39 additions and 0 deletions
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37
drivers/tty/serial/atmel_serial.c
View File

@ -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);
@ -1477,6 +1479,34 @@ 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
*/
@ -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:

2
include/linux/atmel_serial.h
View File

@ -124,4 +124,6 @@
#define ATMEL_US_NER 0x44 /* Number of Errors Register */
#define ATMEL_US_IF 0x4c /* IrDA Filter Register */
#define ATMEL_US_NAME 0xf0 /* Ip Name */
#endif