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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) <hpeter+linux_kernel@gmail.com>
[ johan: rename mode-mask define, and only use GENMASK() for masks ]
Signed-off-by: Johan Hovold <johan@kernel.org>
This commit is contained in:
Ji-Ze Hong (Peter Hong) 2018-01-11 14:47:16 +08:00 committed by Johan Hovold
parent 3aacac02f3
commit ee0309b46a
1 changed files with 30 additions and 0 deletions
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30
drivers/usb/serial/f81534.c
View File

@ -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;
}