diff options
| author | Chris J Arges <arges@linux.vnet.ibm.com> | 2008-11-04 15:19:06 +0300 |
|---|---|---|
| committer | Paul Mackerras <paulus@samba.org> | 2008-11-19 08:04:23 +0300 |
| commit | 8c6531868d4917adbd363030f28a734b76c7471a (patch) | |
| tree | 8456c959a1323bc0deb954ed7c5e0595aefd6121 /drivers/serial | |
| parent | 9b82f3e61758ed897200f0244b63a77c1791bcba (diff) | |
| download | linux-8c6531868d4917adbd363030f28a734b76c7471a.tar.xz | |
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>
Diffstat (limited to 'drivers/serial')
| -rw-r--r-- | drivers/serial/pmac_zilog.c | 27 |
1 files changed, 27 insertions, 0 deletions
diff --git a/drivers/serial/pmac_zilog.c b/drivers/serial/pmac_zilog.c index 317b061f7641..ad3488504010 100644 --- a/drivers/serial/pmac_zilog.c +++ b/drivers/serial/pmac_zilog.c @@ -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 }; /* |