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serial/pmac_zilog: Add console polling support 

This implements poll_get_char and poll_put_char for console polling,
which enables kgdb to work on machines that use the pmac_zilog serial
driver, for example the Apple PowerMac G5.

Signed-off-by: Chris J Arges <arges@linux.vnet.ibm.com>
Signed-off-by: Paul Mackerras <paulus@samba.org>
This commit is contained in:
Chris J Arges 2008-11-04 12:19:06 +00:00 committed by Paul Mackerras
parent 9b82f3e617
commit 8c6531868d
1 changed files with 27 additions and 0 deletions
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27
drivers/serial/pmac_zilog.c
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@ -1383,6 +1383,29 @@ static int pmz_verify_port(struct uart_port *port, struct serial_struct *ser)
return -EINVAL;
}
#ifdef CONFIG_CONSOLE_POLL
static int pmz_poll_get_char(struct uart_port *port)
{
struct uart_pmac_port *uap = (struct uart_pmac_port *)port;
while ((read_zsreg(uap, R0) & Rx_CH_AV) == 0)
udelay(5);
return read_zsdata(uap);
}
static void pmz_poll_put_char(struct uart_port *port, unsigned char c)
{
struct uart_pmac_port *uap = (struct uart_pmac_port *)port;
/* Wait for the transmit buffer to empty. */
while ((read_zsreg(uap, R0) & Tx_BUF_EMP) == 0)
udelay(5);
write_zsdata(uap, c);
}
#endif
static struct uart_ops pmz_pops = {
.tx_empty = pmz_tx_empty,
.set_mctrl = pmz_set_mctrl,
@ -1400,6 +1423,10 @@ static struct uart_ops pmz_pops = {
.request_port = pmz_request_port,
.config_port = pmz_config_port,
.verify_port = pmz_verify_port,
#ifdef CONFIG_CONSOLE_POLL
.poll_get_char = pmz_poll_get_char,
.poll_put_char = pmz_poll_put_char,
#endif
};
/*