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serial: samsung: Add poll_get_char & poll_put_char

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The following patch allows users to use KGDB over serial console on
board based on Samsung SOC. It has been tested on a board using
exynos5.

[dianders: changed poll to return NO_POLL_CHAR, which appears to
fix 'help' in kgdb; also updated commit message]

Signed-off-by: Julien Pichon <pichon.jln@gmail.com>
Signed-off-by: Doug Anderson <dianders@chromium.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Julien Pichon 2012-09-21 23:22:31 -07:00 committed by Greg Kroah-Hartman
parent 6e62bdc07e
commit 93b5c032d9
1 changed files with 47 additions and 0 deletions
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47
drivers/tty/serial/samsung.c
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@ -876,11 +876,24 @@ s3c24xx_serial_verify_port(struct uart_port *port, struct serial_struct *ser)
static struct console s3c24xx_serial_console;
static int __init s3c24xx_serial_console_init(void)
{
register_console(&s3c24xx_serial_console);
return 0;
}
console_initcall(s3c24xx_serial_console_init);
#define S3C24XX_SERIAL_CONSOLE &s3c24xx_serial_console
#else
#define S3C24XX_SERIAL_CONSOLE NULL
#endif
#ifdef CONFIG_CONSOLE_POLL
static int s3c24xx_serial_get_poll_char(struct uart_port *port);
static void s3c24xx_serial_put_poll_char(struct uart_port *port,
unsigned char c);
#endif
static struct uart_ops s3c24xx_serial_ops = {
.pm = s3c24xx_serial_pm,
.tx_empty = s3c24xx_serial_tx_empty,
@ -899,6 +912,10 @@ static struct uart_ops s3c24xx_serial_ops = {
.request_port = s3c24xx_serial_request_port,
.config_port = s3c24xx_serial_config_port,
.verify_port = s3c24xx_serial_verify_port,
#ifdef CONFIG_CONSOLE_POLL
.poll_get_char = s3c24xx_serial_get_poll_char,
.poll_put_char = s3c24xx_serial_put_poll_char,
#endif
};
static struct uart_driver s3c24xx_uart_drv = {
@ -1316,6 +1333,36 @@ s3c24xx_serial_console_txrdy(struct uart_port *port, unsigned int ufcon)
return (utrstat & S3C2410_UTRSTAT_TXE) ? 1 : 0;
}
#ifdef CONFIG_CONSOLE_POLL
/*
* Console polling routines for writing and reading from the uart while
* in an interrupt or debug context.
*/
static int s3c24xx_serial_get_poll_char(struct uart_port *port)
{
struct s3c24xx_uart_port *ourport = to_ourport(port);
unsigned int ufstat;
ufstat = rd_regl(port, S3C2410_UFSTAT);
if (s3c24xx_serial_rx_fifocnt(ourport, ufstat) == 0)
return NO_POLL_CHAR;
return rd_regb(port, S3C2410_URXH);
}
static void s3c24xx_serial_put_poll_char(struct uart_port *port,
unsigned char c)
{
unsigned int ufcon = rd_regl(cons_uart, S3C2410_UFCON);
while (!s3c24xx_serial_console_txrdy(port, ufcon))
cpu_relax();
wr_regb(cons_uart, S3C2410_UTXH, c);
}
#endif /* CONFIG_CONSOLE_POLL */
static void
s3c24xx_serial_console_putchar(struct uart_port *port, int ch)
{