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path: root/drivers/tty/serial/atmel_serial.c
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Diffstat (limited to 'drivers/tty/serial/atmel_serial.c')
-rw-r--r--drivers/tty/serial/atmel_serial.c28
1 files changed, 20 insertions, 8 deletions
diff --git a/drivers/tty/serial/atmel_serial.c b/drivers/tty/serial/atmel_serial.c
index d067285a2d20..c7d99af46a96 100644
--- a/drivers/tty/serial/atmel_serial.c
+++ b/drivers/tty/serial/atmel_serial.c
@@ -99,6 +99,7 @@ static void atmel_stop_rx(struct uart_port *port);
#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)
+#define UART_GET_IP_VERSION(port) __raw_readl((port)->membase + ATMEL_US_VERSION)
/* PDC registers */
#define UART_PUT_PTCR(port,v) __raw_writel(v, (port)->membase + ATMEL_PDC_PTCR)
@@ -1499,10 +1500,11 @@ 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)
+static void 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);
+ u32 version;
int usart, uart;
/* usart and uart ascii */
usart = 0x55534152;
@@ -1517,11 +1519,23 @@ static int atmel_get_ip_name(struct uart_port *port)
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;
+ /* fallback for older SoCs: use version field */
+ version = UART_GET_IP_VERSION(port);
+ switch (version) {
+ case 0x302:
+ case 0x10213:
+ dev_dbg(port->dev, "This version is usart\n");
+ atmel_port->is_usart = true;
+ break;
+ case 0x203:
+ case 0x10202:
+ dev_dbg(port->dev, "This version is uart\n");
+ atmel_port->is_usart = false;
+ break;
+ default:
+ dev_err(port->dev, "Not supported ip name nor version, set to uart\n");
+ }
}
-
- return 0;
}
/*
@@ -2405,9 +2419,7 @@ static int atmel_serial_probe(struct platform_device *pdev)
/*
* Get port name of usart or uart
*/
- ret = atmel_get_ip_name(&port->uart);
- if (ret < 0)
- goto err_add_port;
+ atmel_get_ip_name(&port->uart);
return 0;