[MIPS] Add early console for Cobalt.
Signed-off-by: Peter Horton <pdh@colonel-panic.org>
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
diff --git a/arch/mips/Kconfig b/arch/mips/Kconfig
index 3a0f89d..9d1e78f 100644
--- a/arch/mips/Kconfig
+++ b/arch/mips/Kconfig
@@ -790,6 +790,7 @@
source "arch/mips/tx4938/Kconfig"
source "arch/mips/vr41xx/Kconfig"
source "arch/mips/philips/pnx8550/common/Kconfig"
+source "arch/mips/cobalt/Kconfig"
endmenu
diff --git a/arch/mips/cobalt/Kconfig b/arch/mips/cobalt/Kconfig
new file mode 100644
index 0000000..7c42b08
--- /dev/null
+++ b/arch/mips/cobalt/Kconfig
@@ -0,0 +1,7 @@
+config EARLY_PRINTK
+ bool "Early console support"
+ depends on MIPS_COBALT
+ help
+ Provide early console support by direct access to the
+ on board UART. The UART must have been previously
+ initialised by the boot loader.
diff --git a/arch/mips/cobalt/Makefile b/arch/mips/cobalt/Makefile
index 3b6b757..720e757 100644
--- a/arch/mips/cobalt/Makefile
+++ b/arch/mips/cobalt/Makefile
@@ -4,4 +4,6 @@
obj-y := irq.o int-handler.o reset.o setup.o
+obj-$(CONFIG_EARLY_PRINTK) += console.o
+
EXTRA_AFLAGS := $(CFLAGS)
diff --git a/arch/mips/cobalt/console.c b/arch/mips/cobalt/console.c
new file mode 100644
index 0000000..45c2d27
--- /dev/null
+++ b/arch/mips/cobalt/console.c
@@ -0,0 +1,43 @@
+/*
+ * (C) P. Horton 2006
+ */
+
+#include <linux/config.h>
+#include <linux/init.h>
+#include <linux/kernel.h>
+#include <linux/console.h>
+#include <linux/serial_reg.h>
+#include <asm/addrspace.h>
+#include <asm/mach-cobalt/cobalt.h>
+
+static void putchar(int c)
+{
+ if(c == '\n')
+ putchar('\r');
+
+ while(!(COBALT_UART[UART_LSR] & UART_LSR_THRE))
+ ;
+
+ COBALT_UART[UART_TX] = c;
+}
+
+static void cons_write(struct console *c, const char *s, unsigned n)
+{
+ while(n-- && *s)
+ putchar(*s++);
+}
+
+static struct console cons_info =
+{
+ .name = "uart",
+ .write = cons_write,
+ .flags = CON_PRINTBUFFER | CON_BOOT,
+ .index = -1,
+};
+
+void __init cobalt_early_console(void)
+{
+ register_console(&cons_info);
+
+ printk("Cobalt: early console registered\n");
+}
diff --git a/arch/mips/cobalt/setup.c b/arch/mips/cobalt/setup.c
index b9713a7..4f9ea12 100644
--- a/arch/mips/cobalt/setup.c
+++ b/arch/mips/cobalt/setup.c
@@ -31,6 +31,7 @@
extern void cobalt_machine_restart(char *command);
extern void cobalt_machine_halt(void);
extern void cobalt_machine_power_off(void);
+extern void cobalt_early_console(void);
int cobalt_board_id;
@@ -109,14 +110,6 @@
/* I/O port resource must include UART and LCD/buttons */
ioport_resource.end = 0x0fffffff;
- /*
- * This is a prom style console. We just poke at the
- * UART to make it talk.
- * Only use this console if you really screw up and can't
- * get to the stage of setting up a real serial console.
- */
- /*ns16550_setup_console();*/
-
/* request I/O space for devices used on all i[345]86 PCs */
for (i = 0; i < COBALT_IO_RESOURCES; i++)
request_resource(&ioport_resource, cobalt_io_resources + i);
@@ -136,6 +129,10 @@
#ifdef CONFIG_SERIAL_8250
if (cobalt_board_id > COBALT_BRD_ID_RAQ1) {
+#ifdef CONFIG_EARLY_PRINTK
+ cobalt_early_console();
+#endif
+
uart.line = 0;
uart.type = PORT_UNKNOWN;
uart.uartclk = 18432000;
diff --git a/include/asm-mips/mach-cobalt/cobalt.h b/include/asm-mips/mach-cobalt/cobalt.h
index 78e1df2..b3c5ecb 100644
--- a/include/asm-mips/mach-cobalt/cobalt.h
+++ b/include/asm-mips/mach-cobalt/cobalt.h
@@ -113,4 +113,6 @@
# define COBALT_KEY_SELECT (1 << 7)
# define COBALT_KEY_MASK 0xfe
+#define COBALT_UART ((volatile unsigned char *) CKSEG1ADDR(0x1c800000))
+
#endif /* __ASM_COBALT_H */