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76 lines
2.1 KiB
Diff
76 lines
2.1 KiB
Diff
From 9d9398944488cd3a3e1e0912b26fbc4d5921e547 Mon Sep 17 00:00:00 2001
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From: Daniel Golle <daniel@makrotopia.org>
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Date: Mon, 4 Jun 2018 23:33:07 +0200
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Subject: [PATCH] tty: serial: exar: generalize RS485 setup
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Move the non-board-specific part of the RS485 initialization from
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iot2040_rs485_config function to a new generic function used also for
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other boards.
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This allows using TIOCGRS485 and TIOCSRS485 on boards (such as mPCIe
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serial IO modules) which are hard-wired to RS485 or have jumpers for
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their configurations.
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Signed-off-by: Daniel Golle <daniel@makrotopia.org>
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Reviewed-by: Jan Kiszka <jan.kiszka@siemens.com>
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Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
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---
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drivers/tty/serial/8250/8250_exar.c | 38 +++++++++++++++++++----------
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1 file changed, 25 insertions(+), 13 deletions(-)
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--- a/drivers/tty/serial/8250/8250_exar.c
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+++ b/drivers/tty/serial/8250/8250_exar.c
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@@ -283,8 +283,32 @@ static int xr17v35x_register_gpio(struct
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return 0;
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}
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+static int generic_rs485_config(struct uart_port *port,
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+ struct serial_rs485 *rs485)
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+{
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+ bool is_rs485 = !!(rs485->flags & SER_RS485_ENABLED);
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+ u8 __iomem *p = port->membase;
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+ u8 value;
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+
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+ value = readb(p + UART_EXAR_FCTR);
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+ if (is_rs485)
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+ value |= UART_FCTR_EXAR_485;
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+ else
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+ value &= ~UART_FCTR_EXAR_485;
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+
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+ writeb(value, p + UART_EXAR_FCTR);
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+
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+ if (is_rs485)
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+ writeb(UART_EXAR_RS485_DLY(4), p + UART_MSR);
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+
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+ port->rs485 = *rs485;
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+
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+ return 0;
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+}
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+
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static const struct exar8250_platform exar8250_default_platform = {
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.register_gpio = xr17v35x_register_gpio,
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+ .rs485_config = generic_rs485_config,
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};
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static int iot2040_rs485_config(struct uart_port *port,
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@@ -317,19 +341,7 @@ static int iot2040_rs485_config(struct u
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value |= mode;
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writeb(value, p + UART_EXAR_MPIOLVL_7_0);
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- value = readb(p + UART_EXAR_FCTR);
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- if (is_rs485)
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- value |= UART_FCTR_EXAR_485;
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- else
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- value &= ~UART_FCTR_EXAR_485;
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- writeb(value, p + UART_EXAR_FCTR);
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-
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- if (is_rs485)
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- writeb(UART_EXAR_RS485_DLY(4), p + UART_MSR);
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-
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- port->rs485 = *rs485;
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-
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- return 0;
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+ return generic_rs485_config(port, rs485);
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}
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static const struct property_entry iot2040_gpio_properties[] = {
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