From ee0309b46a20304d30c0e0447a2da2a94115731c Mon Sep 17 00:00:00 2001 From: "Ji-Ze Hong (Peter Hong)" Date: Thu, 11 Jan 2018 14:47:16 +0800 Subject: [PATCH] USB: serial: f81534: add auto RTS direction support 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) [ johan: rename mode-mask define, and only use GENMASK() for masks ] Signed-off-by: Johan Hovold --- 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 cfba05489bfa..5caa945217b5 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 (BIT(0) | BIT(1)) +#define F81534_PORT_CONF_MODE_MASK 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_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 (BIT(1) | BIT(2)) #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_PORT_CONF_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; } -- 2.45.2