mirror of
https://github.com/openwrt/openwrt.git
synced 2024-12-25 00:11:13 +00:00
76 lines
2.1 KiB
Diff
76 lines
2.1 KiB
Diff
From 9d9398944488cd3a3e1e0912b26fbc4d5921e547 Mon Sep 17 00:00:00 2001
|
|
From: Daniel Golle <daniel@makrotopia.org>
|
|
Date: Mon, 4 Jun 2018 23:33:07 +0200
|
|
Subject: [PATCH] tty: serial: exar: generalize RS485 setup
|
|
|
|
Move the non-board-specific part of the RS485 initialization from
|
|
iot2040_rs485_config function to a new generic function used also for
|
|
other boards.
|
|
This allows using TIOCGRS485 and TIOCSRS485 on boards (such as mPCIe
|
|
serial IO modules) which are hard-wired to RS485 or have jumpers for
|
|
their configurations.
|
|
|
|
Signed-off-by: Daniel Golle <daniel@makrotopia.org>
|
|
Reviewed-by: Jan Kiszka <jan.kiszka@siemens.com>
|
|
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
|
|
---
|
|
drivers/tty/serial/8250/8250_exar.c | 38 +++++++++++++++++++----------
|
|
1 file changed, 25 insertions(+), 13 deletions(-)
|
|
|
|
--- a/drivers/tty/serial/8250/8250_exar.c
|
|
+++ b/drivers/tty/serial/8250/8250_exar.c
|
|
@@ -275,8 +275,32 @@ static int xr17v35x_register_gpio(struct
|
|
return 0;
|
|
}
|
|
|
|
+static int generic_rs485_config(struct uart_port *port,
|
|
+ struct serial_rs485 *rs485)
|
|
+{
|
|
+ bool is_rs485 = !!(rs485->flags & SER_RS485_ENABLED);
|
|
+ u8 __iomem *p = port->membase;
|
|
+ u8 value;
|
|
+
|
|
+ value = readb(p + UART_EXAR_FCTR);
|
|
+ if (is_rs485)
|
|
+ value |= UART_FCTR_EXAR_485;
|
|
+ else
|
|
+ value &= ~UART_FCTR_EXAR_485;
|
|
+
|
|
+ writeb(value, p + UART_EXAR_FCTR);
|
|
+
|
|
+ if (is_rs485)
|
|
+ writeb(UART_EXAR_RS485_DLY(4), p + UART_MSR);
|
|
+
|
|
+ port->rs485 = *rs485;
|
|
+
|
|
+ return 0;
|
|
+}
|
|
+
|
|
static const struct exar8250_platform exar8250_default_platform = {
|
|
.register_gpio = xr17v35x_register_gpio,
|
|
+ .rs485_config = generic_rs485_config,
|
|
};
|
|
|
|
static int iot2040_rs485_config(struct uart_port *port,
|
|
@@ -309,19 +333,7 @@ static int iot2040_rs485_config(struct u
|
|
value |= mode;
|
|
writeb(value, p + UART_EXAR_MPIOLVL_7_0);
|
|
|
|
- value = readb(p + UART_EXAR_FCTR);
|
|
- if (is_rs485)
|
|
- value |= UART_FCTR_EXAR_485;
|
|
- else
|
|
- value &= ~UART_FCTR_EXAR_485;
|
|
- writeb(value, p + UART_EXAR_FCTR);
|
|
-
|
|
- if (is_rs485)
|
|
- writeb(UART_EXAR_RS485_DLY(4), p + UART_MSR);
|
|
-
|
|
- port->rs485 = *rs485;
|
|
-
|
|
- return 0;
|
|
+ return generic_rs485_config(port, rs485);
|
|
}
|
|
|
|
static const struct property_entry iot2040_gpio_properties[] = {
|