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kgdb: kgdboc pl011 I/O module

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Implement the serial polling hooks for the pl011 uart for use with
kgdboc.

This patch was specifically tested on the ARM Versatile AB reference
platform.

[ [email protected]: minor cleanups. ]

Signed-off-by: Jason Wessel <[email protected]>
Signed-off-by: Ingo Molnar <[email protected]>
Signed-off-by: Thomas Gleixner <[email protected]>
This commit is contained in:
Jason Wessel 2008-02-20 13:33:39 -06:00 • committed by Ingo Molnar
commit 84b5ae1521
1 changed files with 30 additions and 0 deletions
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30
drivers/serial/amba-pl011.c
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@ -314,6 +314,32 @@ static void pl011_break_ctl(struct uart_port *port, int break_state)
spin_unlock_irqrestore(&uap->port.lock, flags);
}
#ifdef CONFIG_CONSOLE_POLL
static int pl010_get_poll_char(struct uart_port *port)
{
struct uart_amba_port *uap = (struct uart_amba_port *)port;
unsigned int status;
do {
status = readw(uap->port.membase + UART01x_FR);
} while (status & UART01x_FR_RXFE);
return readw(uap->port.membase + UART01x_DR);
}
static void pl010_put_poll_char(struct uart_port *port,
unsigned char ch)
{
struct uart_amba_port *uap = (struct uart_amba_port *)port;
while (readw(uap->port.membase + UART01x_FR) & UART01x_FR_TXFF)
barrier();
writew(ch, uap->port.membase + UART01x_DR);
}
#endif /* CONFIG_CONSOLE_POLL */
static int pl011_startup(struct uart_port *port)
{
struct uart_amba_port *uap = (struct uart_amba_port *)port;
@ -572,6 +598,10 @@ static struct uart_ops amba_pl011_pops = {
.request_port = pl010_request_port,
.config_port = pl010_config_port,
.verify_port = pl010_verify_port,
#ifdef CONFIG_CONSOLE_POLL
.poll_get_char = pl010_get_poll_char,
.poll_put_char = pl010_put_poll_char,
#endif
};
static struct uart_amba_port *amba_ports[UART_NR];