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>
diff --git a/drivers/tty/serial/atmel_serial.c b/drivers/tty/serial/atmel_serial.c
index 1db6871..8dbc3e6 100644
--- a/drivers/tty/serial/atmel_serial.c
+++ b/drivers/tty/serial/atmel_serial.c
@@ -97,6 +97,7 @@
#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 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 @@
}
/*
+ * 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 @@
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: