MIPS: Malta: use generic 8250 early console
This patch switches Malta from using the MIPS implementation of early
printk with Malta's prom_putchar to using the generic 8250_early
implementation. This offers a couple of advantages:
- We duplicate less generic code.
- The UART can be initialised rather than being reliant upon
inheriting a valid setup from the bootloader.
The Malta console_config function is extended to initialise the early
console if no earlycon= kernel parameter is provided, inheriting the
modetty0 bootloader environment if present and falling back to a
default 38400n8r setup if not. This matches the behaviour used for the
regular console= parameter.
Signed-off-by: Paul Burton <paul.burton@imgtec.com>
Reviewed-by: Markos Chandras <markos.chandras@imgtec.com>
Reviewed-by: James Hogan <james.hogan@imgtec.com>
Signed-off-by: John Crispin <blogic@openwrt.org>
Patchwork: http://patchwork.linux-mips.org/patch/6183/
diff --git a/arch/mips/mti-malta/malta-init.c b/arch/mips/mti-malta/malta-init.c
index ff8caff..fcebfce 100644
--- a/arch/mips/mti-malta/malta-init.c
+++ b/arch/mips/mti-malta/malta-init.c
@@ -14,6 +14,7 @@
#include <linux/init.h>
#include <linux/string.h>
#include <linux/kernel.h>
+#include <linux/serial_8250.h>
#include <asm/cacheflush.h>
#include <asm/smp-ops.h>
@@ -44,32 +45,39 @@
char parity = '\0', bits = '\0', flow = '\0';
char *s;
- if ((strstr(fw_getcmdline(), "console=")) == NULL) {
- s = fw_getenv("modetty0");
- if (s) {
- while (*s >= '0' && *s <= '9')
- baud = baud*10 + *s++ - '0';
- if (*s == ',')
- s++;
- if (*s)
- parity = *s++;
- if (*s == ',')
- s++;
- if (*s)
- bits = *s++;
- if (*s == ',')
- s++;
- if (*s == 'h')
- flow = 'r';
- }
- if (baud == 0)
- baud = 38400;
- if (parity != 'n' && parity != 'o' && parity != 'e')
- parity = 'n';
- if (bits != '7' && bits != '8')
- bits = '8';
- if (flow == '\0')
+ s = fw_getenv("modetty0");
+ if (s) {
+ while (*s >= '0' && *s <= '9')
+ baud = baud*10 + *s++ - '0';
+ if (*s == ',')
+ s++;
+ if (*s)
+ parity = *s++;
+ if (*s == ',')
+ s++;
+ if (*s)
+ bits = *s++;
+ if (*s == ',')
+ s++;
+ if (*s == 'h')
flow = 'r';
+ }
+ if (baud == 0)
+ baud = 38400;
+ if (parity != 'n' && parity != 'o' && parity != 'e')
+ parity = 'n';
+ if (bits != '7' && bits != '8')
+ bits = '8';
+ if (flow == '\0')
+ flow = 'r';
+
+ if ((strstr(fw_getcmdline(), "earlycon=")) == NULL) {
+ sprintf(console_string, "uart8250,io,0x3f8,%d%c%c", baud,
+ parity, bits);
+ setup_early_serial8250_console(console_string);
+ }
+
+ if ((strstr(fw_getcmdline(), "console=")) == NULL) {
sprintf(console_string, " console=ttyS0,%d%c%c%c", baud,
parity, bits, flow);
strcat(fw_getcmdline(), console_string);