tty/serial: at91: add a fallback option to determine uart/usart property

On older SoC, the "name" field is not filled in the register map.
Fix the way to figure out if the serial port is an uart or an usart for these
older products (with corresponding properties).

Signed-off-by: Nicolas Ferre <nicolas.ferre@atmel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

1 files changed, 18 insertions, 1 deletions

diff --git a/drivers/tty/serial/atmel_serial.c b/drivers/tty/serial/atmel_serial.c
index 6b0f75eac8a2..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)
@@ -1503,6 +1504,7 @@ 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;
@@ -1517,7 +1519,22 @@ static void 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");
+                /* 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");
+                }
         }
 }