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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>
This commit is contained in:
Daniel Golle 2018-06-04 23:33:07 +02:00 committed by Greg Kroah-Hartman
parent c3bf40ce2c
commit 9d93989444
1 changed files with 25 additions and 13 deletions
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38
drivers/tty/serial/8250/8250_exar.c
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@ -272,8 +272,32 @@ static int xr17v35x_register_gpio(struct pci_dev *pcidev,
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,
@ -306,19 +330,7 @@ static int iot2040_rs485_config(struct uart_port *port,
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[] = {