[PATCH] powerpc: serial port discovery (#2)

This moves the discovery of legacy serial ports to a separate file,
makes it common to ppc32 and ppc64, and reworks it to use the new OF
address translators to get to the ports early. This new version can also
detect some PCI serial cards using legacy chips and will probably match
those discovered port with the default console choice.

Only ppc64 gets udbg still yet, unifying udbg isn't finished yet.

It also adds some speed-probing code to udbg so that the default console
can come up at the same speed it was set to by the firmware.

Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Signed-off-by: Paul Mackerras <paulus@samba.org>

1 files changed, 30 insertions, 38 deletions

diff --git a/arch/powerpc/platforms/pseries/lpar.c b/arch/powerpc/platforms/pseries/lpar.c
index cf1bc11b334..cc0939d4cad 100644
--- a/arch/powerpc/platforms/pseries/lpar.c
+++ b/arch/powerpc/platforms/pseries/lpar.c
@@ -24,6 +24,7 @@
 #include <linux/config.h>
 #include <linux/kernel.h>
 #include <linux/dma-mapping.h>
+#include <linux/console.h>
 #include <asm/processor.h>
 #include <asm/mmu.h>
 #include <asm/page.h>
@@ -191,7 +192,7 @@ static unsigned char udbg_getcLP(void)
 /* call this from early_init() for a working debug console on
  * vterm capable LPAR machines
  */
-void udbg_init_debug_lpar(void)
+void __init udbg_init_debug_lpar(void)
 {
         vtermno = 0;
         udbg_putc = udbg_putcLP;
@@ -200,63 +201,54 @@ void udbg_init_debug_lpar(void)
 }
 
 /* returns 0 if couldn't find or use /chosen/stdout as console */
-int find_udbg_vterm(void)
+void __init find_udbg_vterm(void)
 {
         struct device_node *stdout_node;
         u32 *termno;
         char *name;
-        int found = 0;
+        int add_console;
 
         /* find the boot console from /chosen/stdout */
         if (!of_chosen)
-                return 0;
+                return;
         name = (char *)get_property(of_chosen, "linux,stdout-path", NULL);
         if (name == NULL)
-                return 0;
+                return;
         stdout_node = of_find_node_by_path(name);
         if (!stdout_node)
-                return 0;
-
-        /* now we have the stdout node; figure out what type of device it is. */
+                return;
         name = (char *)get_property(stdout_node, "name", NULL);
         if (!name) {
                 printk(KERN_WARNING "stdout node missing 'name' property!\n");
                 goto out;
         }
+        /* The user has requested a console so this is already set up. */
+        add_console = !strstr(cmd_line, "console=");
 
-        if (strncmp(name, "vty", 3) == 0) {
-                if (device_is_compatible(stdout_node, "hvterm1")) {
-                        termno = (u32 *)get_property(stdout_node, "reg", NULL);
-                        if (termno) {
-                                vtermno = termno[0];
-                                udbg_putc = udbg_putcLP;
-                                udbg_getc = udbg_getcLP;
-                                udbg_getc_poll = udbg_getc_pollLP;
-                                found = 1;
-                        }
-                } else if (device_is_compatible(stdout_node, "hvterm-protocol")) {
-                        termno = (u32 *)get_property(stdout_node, "reg", NULL);
-                        if (termno) {
-                                vtermno = termno[0];
-                                udbg_putc = udbg_hvsi_putc;
-                                udbg_getc = udbg_hvsi_getc;
-                                udbg_getc_poll = udbg_hvsi_getc_poll;
-                                found = 1;
-                        }
-                }
-        } else if (strncmp(name, "serial", 6)) {
-                /* XXX fix ISA serial console */
-                printk(KERN_WARNING "serial stdout on LPAR ('%s')! "
-                                "can't print udbg messages\n",
-                       stdout_node->full_name);
-        } else {
-                printk(KERN_WARNING "don't know how to print to stdout '%s'\n",
-                       stdout_node->full_name);
+        /* Check if it's a virtual terminal */
+        if (strncmp(name, "vty", 3) != 0)
+                goto out;
+        termno = (u32 *)get_property(stdout_node, "reg", NULL);
+        if (termno == NULL)
+                goto out;
+        vtermno = termno[0];
+
+        if (device_is_compatible(stdout_node, "hvterm1")) {
+                udbg_putc = udbg_putcLP;
+                udbg_getc = udbg_getcLP;
+                udbg_getc_poll = udbg_getc_pollLP;
+                if (add_console)
+                        add_preferred_console("hvc", termno[0] & 0xff, NULL);
+        } else if (device_is_compatible(stdout_node, "hvterm-protocol")) {
+                vtermno = termno[0];
+                udbg_putc = udbg_hvsi_putc;
+                udbg_getc = udbg_hvsi_getc;
+                udbg_getc_poll = udbg_hvsi_getc_poll;
+                if (add_console)
+                        add_preferred_console("hvsi", termno[0] & 0xff, NULL);
         }
-
 out:
         of_node_put(stdout_node);
-        return found;
 }
 
 void vpa_init(int cpu)