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serial: samsung: Add poll_get_char & poll_put_char
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>
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1 changed files with 47 additions and 0 deletions
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@ -876,11 +876,24 @@ s3c24xx_serial_verify_port(struct uart_port *port, struct serial_struct *ser)
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static struct console s3c24xx_serial_console;
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static int __init s3c24xx_serial_console_init(void)
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{
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register_console(&s3c24xx_serial_console);
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return 0;
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}
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console_initcall(s3c24xx_serial_console_init);
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#define S3C24XX_SERIAL_CONSOLE &s3c24xx_serial_console
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#else
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#define S3C24XX_SERIAL_CONSOLE NULL
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#endif
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#ifdef CONFIG_CONSOLE_POLL
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static int s3c24xx_serial_get_poll_char(struct uart_port *port);
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static void s3c24xx_serial_put_poll_char(struct uart_port *port,
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unsigned char c);
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#endif
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static struct uart_ops s3c24xx_serial_ops = {
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.pm = s3c24xx_serial_pm,
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.tx_empty = s3c24xx_serial_tx_empty,
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@ -899,6 +912,10 @@ static struct uart_ops s3c24xx_serial_ops = {
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.request_port = s3c24xx_serial_request_port,
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.config_port = s3c24xx_serial_config_port,
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.verify_port = s3c24xx_serial_verify_port,
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#ifdef CONFIG_CONSOLE_POLL
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.poll_get_char = s3c24xx_serial_get_poll_char,
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.poll_put_char = s3c24xx_serial_put_poll_char,
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#endif
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};
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static struct uart_driver s3c24xx_uart_drv = {
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@ -1316,6 +1333,36 @@ s3c24xx_serial_console_txrdy(struct uart_port *port, unsigned int ufcon)
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return (utrstat & S3C2410_UTRSTAT_TXE) ? 1 : 0;
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}
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#ifdef CONFIG_CONSOLE_POLL
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/*
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* Console polling routines for writing and reading from the uart while
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* in an interrupt or debug context.
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*/
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static int s3c24xx_serial_get_poll_char(struct uart_port *port)
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{
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struct s3c24xx_uart_port *ourport = to_ourport(port);
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unsigned int ufstat;
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ufstat = rd_regl(port, S3C2410_UFSTAT);
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if (s3c24xx_serial_rx_fifocnt(ourport, ufstat) == 0)
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return NO_POLL_CHAR;
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return rd_regb(port, S3C2410_URXH);
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}
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static void s3c24xx_serial_put_poll_char(struct uart_port *port,
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unsigned char c)
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{
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unsigned int ufcon = rd_regl(cons_uart, S3C2410_UFCON);
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while (!s3c24xx_serial_console_txrdy(port, ufcon))
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cpu_relax();
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wr_regb(cons_uart, S3C2410_UTXH, c);
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}
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#endif /* CONFIG_CONSOLE_POLL */
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static void
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s3c24xx_serial_console_putchar(struct uart_port *port, int ch)
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{
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