The F81532/534 had auto RTS direction support for RS485 mode.
We'll read it from internal Flash with address 0x2f01~0x2f04 for 4 ports.
There are 4 conditions below:
0: F81534_PORT_CONF_RS232.
1: F81534_PORT_CONF_RS485.
2: value error, default to F81534_PORT_CONF_RS232.
3: F81534_PORT_CONF_RS485_INVERT.
F81532/534 Clock register (offset +08h)
Bit0: UART Enable (always on)
Bit2-1: Clock source selector
00: 1.846MHz.
01: 18.46MHz.
10: 24MHz.
11: 14.77MHz.
Bit4: Auto direction(RTS) control (RTS pin Low when TX)
Bit5: Invert direction(RTS) when Bit4 enabled (RTS pin high when TX)
Signed-off-by: Ji-Ze Hong (Peter Hong) <hpeter+linux_ker...@gmail.com>
---
V3:
1: change some BIT() operation to GENMASK().
2: change some dev_info() to dev_dbg().
V2:
1: Read the configure data from flash and save it to shadow clock
register.
drivers/usb/serial/f81534.c | 30 ++++++++++++++++++++++++++++++
1 file changed, 30 insertions(+)
diff --git a/drivers/usb/serial/f81534.c b/drivers/usb/serial/f81534.c
index 1563d3f34381..2201be577dd3 100644
--- a/drivers/usb/serial/f81534.c
+++ b/drivers/usb/serial/f81534.c
@@ -98,11 +98,16 @@
#define F81534_DEFAULT_BAUD_RATE 9600
+#define F81534_PORT_CONF_RS232 0
+#define F81534_PORT_CONF_RS485 BIT(0)
+#define F81534_PORT_CONF_RS485_INVERT GENMASK(1, 0)
#define F81534_PORT_CONF_DISABLE_PORT BIT(3)
#define F81534_PORT_CONF_NOT_EXIST_PORT BIT(7)
#define F81534_PORT_UNAVAILABLE \
(F81534_PORT_CONF_DISABLE_PORT | F81534_PORT_CONF_NOT_EXIST_PORT)
+#define F81534_UART_MODE_MASK GENMASK(1, 0)
+
#define F81534_1X_RXTRIGGER 0xc3
#define F81534_8X_RXTRIGGER 0xcf
@@ -115,6 +120,8 @@
* 01: 18.46MHz.
* 10: 24MHz.
* 11: 14.77MHz.
+ * Bit4: Auto direction(RTS) control (RTS pin Low when TX)
+ * Bit5: Invert direction(RTS) when Bit4 enabled (RTS pin high when TX)
*/
#define F81534_UART_EN BIT(0)
@@ -123,6 +130,8 @@
#define F81534_CLK_24_MHZ BIT(2)
#define F81534_CLK_14_77_MHZ GENMASK(2, 1)
#define F81534_CLK_MASK GENMASK(2, 1)
+#define F81534_CLK_RS485_MODE BIT(4)
+#define F81534_CLK_RS485_INVERT BIT(5)
static const struct usb_device_id f81534_id_table[] = {
{ USB_DEVICE(FINTEK_VENDOR_ID_1, FINTEK_DEVICE_ID) },
@@ -1274,9 +1283,12 @@ static void f81534_lsr_worker(struct work_struct *work)
static int f81534_port_probe(struct usb_serial_port *port)
{
+ struct f81534_serial_private *serial_priv;
struct f81534_port_private *port_priv;
int ret;
+ u8 value;
+ serial_priv = usb_get_serial_data(port->serial);
port_priv = devm_kzalloc(&port->dev, sizeof(*port_priv), GFP_KERNEL);
if (!port_priv)
return -ENOMEM;
@@ -1309,6 +1321,24 @@ static int f81534_port_probe(struct usb_serial_port
*port)
if (ret)
return ret;
+ value = serial_priv->conf_data[port_priv->phy_num];
+ switch (value & F81534_UART_MODE_MASK) {
+ case F81534_PORT_CONF_RS485_INVERT:
+ port_priv->shadow_clk |= F81534_CLK_RS485_MODE |
+ F81534_CLK_RS485_INVERT;
+ dev_dbg(&port->dev, "RS485 invert mode.\n");
+ break;
+ case F81534_PORT_CONF_RS485:
+ port_priv->shadow_clk |= F81534_CLK_RS485_MODE;
+ dev_dbg(&port->dev, "RS485 mode.\n");
+ break;
+
+ default:
+ case F81534_PORT_CONF_RS232:
+ dev_dbg(&port->dev, "RS232 mode.\n");
+ break;
+ }
+
return 0;
}
--
2.7.4
