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Subject[PATCH V1 2/4] usb: serial: f81534: add auto RTS direction support
Date
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_kernel@gmail.com>
---
drivers/usb/serial/f81534.c | 54 +++++++++++++++++++++++++++++++++++++++++++--
1 file changed, 52 insertions(+), 2 deletions(-)

diff --git a/drivers/usb/serial/f81534.c b/drivers/usb/serial/f81534.c
index 76c676ef5f0d..b2d10309c335 100644
--- a/drivers/usb/serial/f81534.c
+++ b/drivers/usb/serial/f81534.c
@@ -102,11 +102,16 @@

#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 (BIT(0) | BIT(1))
#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 (BIT(0) | BIT(1))
+
#define F81534_1X_RXTRIGGER 0xc3
#define F81534_8X_RXTRIGGER 0xcf

@@ -119,6 +124,8 @@
* 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_CLK_1_846_MHZ BIT(0)
@@ -126,6 +133,9 @@
#define F81534_CLK_24_MHZ (BIT(0) | BIT(2))
#define F81534_CLK_14_77_MHZ (BIT(0) | BIT(1) | BIT(2))

+#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) },
{ USB_DEVICE(FINTEK_VENDOR_ID_2, FINTEK_DEVICE_ID) },
@@ -485,16 +495,20 @@ static int f81534_set_port_config(struct usb_serial_port *port,
struct tty_struct *tty, u32 baudrate, u32 old_baudrate, u8 lcr)
{
struct f81534_port_private *port_priv = usb_get_serial_port_data(port);
+ struct f81534_serial_private *serial_priv;
u32 divisor;
int status;
int idx;
u8 value;
+ u8 tmp;
static u32 const baudrate_table[] = {115200, 921600, 1152000,
1500000};
static u8 const clock_table[] = {F81534_CLK_1_846_MHZ,
F81534_CLK_14_77_MHZ, F81534_CLK_18_46_MHZ,
F81534_CLK_24_MHZ};

+ serial_priv = usb_get_serial_data(port->serial);
+
do {
for (idx = 0; idx < ARRAY_SIZE(baudrate_table); ++idx) {
if (baudrate <= baudrate_table[idx] &&
@@ -520,8 +534,25 @@ static int f81534_set_port_config(struct usb_serial_port *port,
} while (1);

port_priv->baud_base = baudrate_table[idx];
- status = f81534_set_port_register(port, F81534_CLOCK_REG,
- clock_table[idx]);
+ tmp = serial_priv->conf_data[port_priv->phy_num];
+
+ switch (tmp & F81534_UART_MODE_MASK) {
+ case F81534_PORT_CONF_RS485_INVERT:
+ value = F81534_CLK_RS485_MODE | F81534_CLK_RS485_INVERT;
+ break;
+ case F81534_PORT_CONF_RS485:
+ value = F81534_CLK_RS485_MODE;
+ break;
+
+ default:
+ /* fall through, default RS232 Mode */
+ case F81534_PORT_CONF_RS232:
+ value = 0;
+ break;
+ }
+
+ value |= clock_table[idx];
+ status = f81534_set_port_register(port, F81534_CLOCK_REG, value);
if (status) {
dev_err(&port->dev, "CLOCK_REG setting failed\n");
return status;
@@ -1270,9 +1301,12 @@ 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;
@@ -1304,6 +1338,22 @@ 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:
+ dev_info(&port->dev, "RS485 invert mode.\n");
+ break;
+ case F81534_PORT_CONF_RS485:
+ dev_info(&port->dev, "RS485 mode.\n");
+ break;
+
+ default:
+ /* fall through, default RS232 Mode */
+ case F81534_PORT_CONF_RS232:
+ dev_info(&port->dev, "RS232 mode.\n");
+ break;
+ }
+
return 0;
}

--
2.7.4
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