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authorChris J Arges <arges@linux.vnet.ibm.com>2008-11-04 13:19:06 +0100
committerPaul Mackerras <paulus@samba.org>2008-11-19 06:04:23 +0100
commit8c6531868d4917adbd363030f28a734b76c7471a (patch)
tree8456c959a1323bc0deb954ed7c5e0595aefd6121 /drivers
parentpowerpc/ps3: Replace the flip_ctl logic in ps3av and ps3fb by a mutex (diff)
downloadlinux-8c6531868d4917adbd363030f28a734b76c7471a.tar.xz
linux-8c6531868d4917adbd363030f28a734b76c7471a.zip
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')
-rw-r--r--drivers/serial/pmac_zilog.c27
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
};
/*