[SPARC]: Fix serial console device detection.

The current scheme works on static interpretation of text names, which
is wrong.

The output-device setting, for example, must be resolved via an alias
or similar to a full path name to the console device.

Paths also contain an optional set of 'options', which starts with a
colon at the end of the path.  The option area is used to specify
which of two serial ports ('a' or 'b') the path refers to when a
device node drives multiple ports.  'a' is assumed if the option
specification is missing.

This was caught by the UltraSPARC-T1 simulator.  The 'output-device'
property was set to 'ttya' and we didn't pick upon the fact that this
is an OBP alias set to '/virtual-devices/console'.  Instead we saw it
as the first serial console device, instead of the hypervisor console.

The infrastructure is now there to take advantage of this to resolve
the console correctly even in multi-head situations in fbcon too.

Thanks to Greg Onufer for the bug report.

Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 1 insertions, 64 deletions

diff --git a/arch/sparc/kernel/setup.c b/arch/sparc/kernel/setup.c
index 64c0ed98820a..f8228383895a 100644
--- a/arch/sparc/kernel/setup.c
+++ b/arch/sparc/kernel/setup.c
@@ -146,31 +146,6 @@ static void __init process_switch(char c)
         }
 }
 
-static void __init process_console(char *commands)
-{
-        serial_console = 0;
-        commands += 8;
-        /* Linux-style serial */
-        if (!strncmp(commands, "ttyS", 4))
-                serial_console = simple_strtoul(commands + 4, NULL, 10) + 1;
-        else if (!strncmp(commands, "tty", 3)) {
-                char c = *(commands + 3);
-                /* Solaris-style serial */
-                if (c == 'a' || c == 'b')
-                        serial_console = c - 'a' + 1;
-                /* else Linux-style fbcon, not serial */
-        }
-#if defined(CONFIG_PROM_CONSOLE)
-        if (!strncmp(commands, "prom", 4)) {
-                char *p;
-
-                for (p = commands - 8; *p && *p != ' '; p++)
-                        *p = ' ';
-                conswitchp = &prom_con;
-        }
-#endif
-}
-
 static void __init boot_flags_init(char *commands)
 {
         while (*commands) {
@@ -187,9 +162,7 @@ static void __init boot_flags_init(char *commands)
                                 process_switch(*commands++);
                         continue;
                 }
-                if (!strncmp(commands, "console=", 8)) {
-                        process_console(commands);
-                } else if (!strncmp(commands, "mem=", 4)) {
+                if (!strncmp(commands, "mem=", 4)) {
                         /*
                          * "mem=XXX[kKmM] overrides the PROM-reported
                          * memory size.
@@ -341,41 +314,6 @@ void __init setup_arch(char **cmdline_p)
         smp_setup_cpu_possible_map();
 }
 
-static int __init set_preferred_console(void)
-{
-        int idev, odev;
-
-        /* The user has requested a console so this is already set up. */
-        if (serial_console >= 0)
-                return -EBUSY;
-
-        idev = prom_query_input_device();
-        odev = prom_query_output_device();
-        if (idev == PROMDEV_IKBD && odev == PROMDEV_OSCREEN) {
-                serial_console = 0;
-        } else if (idev == PROMDEV_ITTYA && odev == PROMDEV_OTTYA) {
-                serial_console = 1;
-        } else if (idev == PROMDEV_ITTYB && odev == PROMDEV_OTTYB) {
-                serial_console = 2;
-        } else if (idev == PROMDEV_I_UNK && odev == PROMDEV_OTTYA) {
-                prom_printf("MrCoffee ttya\n");
-                serial_console = 1;
-        } else if (idev == PROMDEV_I_UNK && odev == PROMDEV_OSCREEN) {
-                serial_console = 0;
-                prom_printf("MrCoffee keyboard\n");
-        } else {
-                prom_printf("Confusing console (idev %d, odev %d)\n",
-                    idev, odev);
-                serial_console = 1;
-        }
-
-        if (serial_console)
-                return add_preferred_console("ttyS", serial_console - 1, NULL);
-
-        return -ENODEV;
-}
-console_initcall(set_preferred_console);
-
 extern char *sparc_cpu_type;
 extern char *sparc_fpu_type;
 
@@ -461,7 +399,6 @@ void sun_do_break(void)
         prom_cmdline();
 }
 
-int serial_console = -1;
 int stop_a_enabled = 1;
 
 static int __init topology_init(void)