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| author | Daniel Golle <daniel@makrotopia.org> | 2018-06-04 23:33:07 +0200 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2018-06-28 14:07:55 +0200 |
| commit | 9d9398944488cd3a3e1e0912b26fbc4d5921e547 (patch) | |
| tree | df7b6ab14b49156a693115c85eb7c5879cd98234 /drivers/tty | |
| parent | serdev: add controller runtime PM support (diff) | |
| download | linux-9d9398944488cd3a3e1e0912b26fbc4d5921e547.tar.xz linux-9d9398944488cd3a3e1e0912b26fbc4d5921e547.zip | |
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>
Diffstat (limited to 'drivers/tty')
| -rw-r--r-- | drivers/tty/serial/8250/8250_exar.c | 38 |
1 files changed, 25 insertions, 13 deletions
diff --git a/drivers/tty/serial/8250/8250_exar.c b/drivers/tty/serial/8250/8250_exar.c index 38af306ca0e8..102e059472ee 100644 --- a/drivers/tty/serial/8250/8250_exar.c +++ b/drivers/tty/serial/8250/8250_exar.c @@ -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[] = { |