This patch provides a mean to replace the default serial_in and serial_out implementations provided by omap-serial.c. Inspired from the 8250.c driver.
Overridding those functions provide a very flexible way to implement special features such as GPIO connected modem lines. (By catching values written to MCR or rewriting values read from MSR on the fly). Signed-off-by: Raphaël Assénat <[email protected]> --- a/arch/arm/plat-omap/include/plat/omap-serial.h +++ b/arch/arm/plat-omap/include/plat/omap-serial.h @@ -63,6 +63,8 @@ struct omap_uart_port_info { resource_size_t mapbase; /* resource base */ unsigned long irqflags; /* request_irq flags */ upf_t flags; /* UPF_* flags */ + unsigned int (*serial_in)(struct uart_port *, int); + void (*serial_out)(struct uart_port *, int, int); }; struct uart_omap_dma { @@ -102,6 +104,9 @@ struct uart_omap_port { unsigned char efr; int use_dma; + + unsigned int (*serial_in)(struct uart_port *, int); + void (*serial_out)(struct uart_port *, int, int); /* * Some bits in registers are cleared on a read, so they must * be saved whenever the register is read but the bits will not --- a/drivers/tty/serial/omap-serial.c +++ b/drivers/tty/serial/omap-serial.c @@ -51,14 +51,23 @@ static int serial_omap_start_rxdma(struct uart_omap_port *up); static inline unsigned int serial_in(struct uart_omap_port *up, int offset) { - offset <<= up->port.regshift; - return readw(up->port.membase + offset); + if (up->serial_in) { + return up->serial_in(&up->port, offset); + } + else { + offset <<= up->port.regshift; + return readw(up->port.membase + offset); + } } static inline void serial_out(struct uart_omap_port *up, int offset, int value) { - offset <<= up->port.regshift; - writew(value, up->port.membase + offset); + if (up->serial_out) { + up->serial_out(&up->port, offset, value); + } else { + offset <<= up->port.regshift; + writew(value, up->port.membase + offset); + } } static inline void serial_omap_clear_fifos(struct uart_omap_port *up) -- To unsubscribe from this list: send the line "unsubscribe linux-omap" in the body of a message to [email protected] More majordomo info at http://vger.kernel.org/majordomo-info.html
