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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>
hifive-unleashed-5.1
Tobias Klauser 2012-02-08 14:36:09 +01:00 committed by Greg Kroah-Hartman
parent 3f5dc70721
commit 418a936e84
2 changed files with 25 additions and 1 deletions
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2
drivers/tty/serial/Makefile
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@ -75,12 +75,12 @@ obj-$(CONFIG_SERIAL_OF_PLATFORM) += of_serial.o
obj-$(CONFIG_SERIAL_OF_PLATFORM_NWPSERIAL) += nwpserial.o
obj-$(CONFIG_SERIAL_KS8695) += serial_ks8695.o
obj-$(CONFIG_SERIAL_OMAP) += omap-serial.o
obj-$(CONFIG_SERIAL_ALTERA_UART) += altera_uart.o
obj-$(CONFIG_KGDB_SERIAL_CONSOLE) += kgdboc.o
obj-$(CONFIG_SERIAL_QE) += ucc_uart.o
obj-$(CONFIG_SERIAL_TIMBERDALE) += timbuart.o
obj-$(CONFIG_SERIAL_GRLIB_GAISLER_APBUART) += apbuart.o
obj-$(CONFIG_SERIAL_ALTERA_JTAGUART) += altera_jtaguart.o
obj-$(CONFIG_SERIAL_ALTERA_UART) += altera_uart.o
obj-$(CONFIG_SERIAL_VT8500) += vt8500_serial.o
obj-$(CONFIG_SERIAL_MRST_MAX3110) += mrst_max3110.o
obj-$(CONFIG_SERIAL_MFD_HSU) += mfd.o

24
drivers/tty/serial/altera_uart.c
View File

@ -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];