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authorPeter Horton <pdh@colonel-panic.org>2006-02-12 17:10:25 +0000
committerRalf Baechle <ralf@linux-mips.org>2006-03-21 13:27:44 +0000
commite87dddeb92618d9dbb8b9f946a193739a4447609 (patch)
tree4a07a4edf9c2ddb2f3f9a36118120144af476d44 /arch/mips/cobalt
parentc4a1745aa09fc110afdefea0e5d025043e348bae (diff)
downloadop-kernel-dev-e87dddeb92618d9dbb8b9f946a193739a4447609.zip
op-kernel-dev-e87dddeb92618d9dbb8b9f946a193739a4447609.tar.gz
[MIPS] Add early console for Cobalt.
Signed-off-by: Peter Horton <pdh@colonel-panic.org> Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
Diffstat (limited to 'arch/mips/cobalt')
-rw-r--r--arch/mips/cobalt/Kconfig7
-rw-r--r--arch/mips/cobalt/Makefile2
-rw-r--r--arch/mips/cobalt/console.c43
-rw-r--r--arch/mips/cobalt/setup.c13
4 files changed, 57 insertions, 8 deletions
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 @@ void __init plat_setup(void)
/* 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 @@ void __init plat_setup(void)
#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;
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