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tty: xuartps: Add polled mode support for xuartps 

This allows KDB/KGDB to run.

Signed-off-by: Vlad Lungu <vlad.lungu@windriver.com>
Signed-off-by: Soren Brinkmann <soren.brinkmann@xilinx.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Vlad Lungu 2013-10-17 14:08:07 -07:00 committed by Greg Kroah-Hartman
parent 0c0c47bc40
commit 6ee04c6c54
1 changed files with 52 additions and 0 deletions
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52
drivers/tty/serial/xilinx_uartps.c
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@ -775,6 +775,54 @@ static void xuartps_enable_ms(struct uart_port *port)
/* N/A */
}
#ifdef CONFIG_CONSOLE_POLL
static int xuartps_poll_get_char(struct uart_port *port)
{
u32 imr;
int c;
/* Disable all interrupts */
imr = xuartps_readl(XUARTPS_IMR_OFFSET);
xuartps_writel(imr, XUARTPS_IDR_OFFSET);
/* Check if FIFO is empty */
if (xuartps_readl(XUARTPS_SR_OFFSET) & XUARTPS_SR_RXEMPTY)
c = NO_POLL_CHAR;
else /* Read a character */
c = (unsigned char) xuartps_readl(XUARTPS_FIFO_OFFSET);
/* Enable interrupts */
xuartps_writel(imr, XUARTPS_IER_OFFSET);
return c;
}
static void xuartps_poll_put_char(struct uart_port *port, unsigned char c)
{
u32 imr;
/* Disable all interrupts */
imr = xuartps_readl(XUARTPS_IMR_OFFSET);
xuartps_writel(imr, XUARTPS_IDR_OFFSET);
/* Wait until FIFO is empty */
while (!(xuartps_readl(XUARTPS_SR_OFFSET) & XUARTPS_SR_TXEMPTY))
cpu_relax();
/* Write a character */
xuartps_writel(c, XUARTPS_FIFO_OFFSET);
/* Wait until FIFO is empty */
while (!(xuartps_readl(XUARTPS_SR_OFFSET) & XUARTPS_SR_TXEMPTY))
cpu_relax();
/* Enable interrupts */
xuartps_writel(imr, XUARTPS_IER_OFFSET);
return;
}
#endif
/** The UART operations structure
*/
static struct uart_ops xuartps_ops = {
@ -807,6 +855,10 @@ static struct uart_ops xuartps_ops = {
.config_port = xuartps_config_port, /* Configure when driver
* adds a xuartps port
*/
#ifdef CONFIG_CONSOLE_POLL
.poll_get_char = xuartps_poll_get_char,
.poll_put_char = xuartps_poll_put_char,
#endif
};
static struct uart_port xuartps_port[2];