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Date: Fri, 21 Sep 2012 23:22:31 -0700 From: Doug Anderson <dianders@...omium.org> To: linux-samsung-soc@...r.kernel.org Cc: linux-serial@...r.kernel.org, linux-kernel@...r.kernel.org, Julien Pichon <pichon.jln@...il.com>, Alan Cox <alan@...ux.intel.com>, Greg Kroah-Hartman <gregkh@...uxfoundation.org>, kgene.kim@...sung.com, GNUtoo@...log.org, heiko@...ech.de, ben-linux@...ff.org, Doug Anderson <dianders@...omium.org> Subject: [PATCH] serial: samsung: Add poll_get_char & poll_put_char From: Julien Pichon <pichon.jln@...il.com> 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. Signed-off-by: Julien Pichon <pichon.jln@...il.com> Signed-off-by: Doug Anderson <dianders@...omium.org> (dianders changed poll to return NO_POLL_CHAR, which appears to fix 'help' in kgdb; also updated commit message) --- This is pulled from an email on <linux-samsung-soc@...r.kernel.org> from Feb 18, 2012. It's never landed anywhere. I've made a small modification that make it so that kgdb's "help" doesn't crash. See: http://comments.gmane.org/gmane.linux.kernel.samsung-soc/9477 drivers/tty/serial/samsung.c | 47 ++++++++++++++++++++++++++++++++++++++++++ 1 files changed, 47 insertions(+), 0 deletions(-) diff --git a/drivers/tty/serial/samsung.c b/drivers/tty/serial/samsung.c index 8eef114..7f04717 100644 --- a/drivers/tty/serial/samsung.c +++ b/drivers/tty/serial/samsung.c @@ -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) { -- 1.7.7.3 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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