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authorBenjamin Herrenschmidt <benh@kernel.crashing.org>2008-07-28 13:49:15 +1000
committerBenjamin Herrenschmidt <benh@kernel.crashing.org>2008-07-28 16:30:53 +1000
commit025d7917a5ede982a5669c6735ef73a227b9827e (patch)
treeb921600f898523c63cefa79effdc4f917b1cf4ab /arch/powerpc/platforms/powermac/setup.c
parentf023bf0f91f1f1b926ec8f5cf0ee24be134bf024 (diff)
downloadlinux-025d7917a5ede982a5669c6735ef73a227b9827e.tar.gz
powerpc/powermac: Fixup default serial port device for pmac_zilog
This removes the non-working code in legacy_serial that tried to handle the powermac SCC ports, and instead add a (now working) function to the powermac platform code to find the default serial console if any. Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Diffstat (limited to 'arch/powerpc/platforms/powermac/setup.c')
-rw-r--r--arch/powerpc/platforms/powermac/setup.c72
1 files changed, 72 insertions, 0 deletions
diff --git a/arch/powerpc/platforms/powermac/setup.c b/arch/powerpc/platforms/powermac/setup.c
index 31635446901a..88ccf3a08a9c 100644
--- a/arch/powerpc/platforms/powermac/setup.c
+++ b/arch/powerpc/platforms/powermac/setup.c
@@ -541,6 +541,78 @@ static int __init pmac_declare_of_platform_devices(void)
}
machine_device_initcall(powermac, pmac_declare_of_platform_devices);
+#ifdef CONFIG_SERIAL_PMACZILOG_CONSOLE
+/*
+ * This is called very early, as part of console_init() (typically just after
+ * time_init()). This function is respondible for trying to find a good
+ * default console on serial ports. It tries to match the open firmware
+ * default output with one of the available serial console drivers.
+ */
+static int __init check_pmac_serial_console(void)
+{
+ struct device_node *prom_stdout = NULL;
+ int offset = 0;
+ const char *name;
+#ifdef CONFIG_SERIAL_PMACZILOG_TTYS
+ char *devname = "ttyS";
+#else
+ char *devname = "ttyPZ";
+#endif
+
+ pr_debug(" -> check_pmac_serial_console()\n");
+
+ /* The user has requested a console so this is already set up. */
+ if (strstr(boot_command_line, "console=")) {
+ pr_debug(" console was specified !\n");
+ return -EBUSY;
+ }
+
+ if (!of_chosen) {
+ pr_debug(" of_chosen is NULL !\n");
+ return -ENODEV;
+ }
+
+ /* We are getting a weird phandle from OF ... */
+ /* ... So use the full path instead */
+ name = of_get_property(of_chosen, "linux,stdout-path", NULL);
+ if (name == NULL) {
+ pr_debug(" no linux,stdout-path !\n");
+ return -ENODEV;
+ }
+ prom_stdout = of_find_node_by_path(name);
+ if (!prom_stdout) {
+ pr_debug(" can't find stdout package %s !\n", name);
+ return -ENODEV;
+ }
+ pr_debug("stdout is %s\n", prom_stdout->full_name);
+
+ name = of_get_property(prom_stdout, "name", NULL);
+ if (!name) {
+ pr_debug(" stdout package has no name !\n");
+ goto not_found;
+ }
+
+ if (strcmp(name, "ch-a") == 0)
+ offset = 0;
+ else if (strcmp(name, "ch-b") == 0)
+ offset = 1;
+ else
+ goto not_found;
+ of_node_put(prom_stdout);
+
+ pr_debug("Found serial console at %s%d\n", devname, offset);
+
+ return add_preferred_console(devname, offset, NULL);
+
+ not_found:
+ pr_debug("No preferred console found !\n");
+ of_node_put(prom_stdout);
+ return -ENODEV;
+}
+console_initcall(check_pmac_serial_console);
+
+#endif /* CONFIG_SERIAL_PMACZILOG_CONSOLE */
+
/*
* Called very early, MMU is off, device-tree isn't unflattened
*/