diff options
| author | Tobias Klauser <tklauser@distanz.ch> | 2012-02-08 17:36:09 +0400 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2012-02-09 21:04:24 +0400 |
| commit | 418a936e84e8f346da322c2e839992aa9df108d4 (patch) | |
| tree | ffea5f42221d970936b06dbeb35b1625f6e703ce /drivers/tty/serial/altera_uart.c | |
| parent | 3f5dc70721af68b76ad544b0c61fea365d67c041 (diff) | |
| download | linux-418a936e84e8f346da322c2e839992aa9df108d4.tar.xz | |
tty: serial: altera_uart: Add CONSOLE_POLL support
This allows altera_uart to be used for KGDB debugging over serial line.
Signed-off-by: Tobias Klauser <tklauser@distanz.ch>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'drivers/tty/serial/altera_uart.c')
| -rw-r--r-- | drivers/tty/serial/altera_uart.c | 24 |
1 files changed, 24 insertions, 0 deletions
diff --git a/drivers/tty/serial/altera_uart.c b/drivers/tty/serial/altera_uart.c index 217833e94b5b..e7903751e058 100644 --- a/drivers/tty/serial/altera_uart.c +++ b/drivers/tty/serial/altera_uart.c @@ -377,6 +377,26 @@ static int altera_uart_verify_port(struct uart_port *port, return 0; } +#ifdef CONFIG_CONSOLE_POLL +static int altera_uart_poll_get_char(struct uart_port *port) +{ + while (!(altera_uart_readl(port, ALTERA_UART_STATUS_REG) & + ALTERA_UART_STATUS_RRDY_MSK)) + cpu_relax(); + + return altera_uart_readl(port, ALTERA_UART_RXDATA_REG); +} + +static void altera_uart_poll_put_char(struct uart_port *port, unsigned char c) +{ + while (!(altera_uart_readl(port, ALTERA_UART_STATUS_REG) & + ALTERA_UART_STATUS_TRDY_MSK)) + cpu_relax(); + + altera_uart_writel(port, c, ALTERA_UART_TXDATA_REG); +} +#endif + /* * Define the basic serial functions we support. */ @@ -397,6 +417,10 @@ static struct uart_ops altera_uart_ops = { .release_port = altera_uart_release_port, .config_port = altera_uart_config_port, .verify_port = altera_uart_verify_port, +#ifdef CONFIG_CONSOLE_POLL + .poll_get_char = altera_uart_poll_get_char, + .poll_put_char = altera_uart_poll_put_char, +#endif }; static struct altera_uart altera_uart_ports[CONFIG_SERIAL_ALTERA_UART_MAXPORTS]; |