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 <raph@xxxxxx>
--- 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)
--
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