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sh: More flexible + SH7780 earlyprintk SCIF support.

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This makes the early printk support somewhat more flexible,
moving the port definition to a config option, and making the
port initialization configurable for sh-ipl+g users.

At the same time, this allows us to trivially wire up the
SH7780 SCIF0, so that's thrown in too more or less for free.

Signed-off-by: Paul Mundt <[email protected]>
This commit is contained in:
Paul Mundt 2006-11-27 12:10:23 +09:00
commit 6fc21b82ef
3 changed files with 39 additions and 24 deletions
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18
arch/sh/Kconfig.debug
View file

@ -17,7 +17,18 @@ config SH_STANDARD_BIOS
config EARLY_SCIF_CONSOLE
bool "Use early SCIF console"
depends on CPU_SH4 || CPU_SH2A && !SH_STANDARD_BIOS
help
This enables an early console using a fixed SCIF port. This can
be used by platforms that are either not running the SH
standard BIOS, or do not wish to use the BIOS callbacks for the
serial I/O.
config EARLY_SCIF_CONSOLE_PORT
hex "SCIF port for early console"
depends on EARLY_SCIF_CONSOLE
default "0xffe00000" if CPU_SUBTYPE_SH7780
default "0xfffe9800" if CPU_SUBTYPE_SH72060
default "0xffe80000" if CPU_SH4
config EARLY_PRINTK
bool "Early printk support"
@ -30,6 +41,11 @@ config EARLY_PRINTK
when the kernel may crash or hang before the serial console is
initialised. If unsure, say N.
On devices that are running SH-IPL and want to keep the port
initialization consistent while not using the BIOS callbacks,
select both the EARLY_SCIF_CONSOLE and SH_STANDARD_BIOS, using
the kernel command line option to toggle back and forth.
config DEBUG_STACKOVERFLOW
bool "Check for stack overflows"
depends on DEBUG_KERNEL

42
arch/sh/kernel/early_printk.c
View file

@ -12,7 +12,7 @@
#include <linux/console.h>
#include <linux/tty.h>
#include <linux/init.h>
#include <asm/io.h>
#include <linux/io.h>
#ifdef CONFIG_SH_STANDARD_BIOS
#include <asm/sh_bios.h>
@ -62,17 +62,9 @@ static struct console bios_console = {
#include <linux/serial_core.h>
#include "../../../drivers/serial/sh-sci.h"
#ifdef CONFIG_CPU_SH4
#define SCIF_REG 0xffe80000
#elif defined(CONFIG_CPU_SUBTYPE_SH72060)
#define SCIF_REG 0xfffe9800
#else
#error "Undefined SCIF for this subtype"
#endif
static struct uart_port scif_port = {
.mapbase = SCIF_REG,
.membase = (char __iomem *)SCIF_REG,
.mapbase = CONFIG_EARLY_SCIF_CONSOLE_PORT,
.membase = (char __iomem *)CONFIG_EARLY_SCIF_CONSOLE_PORT,
};
static void scif_sercon_putc(int c)
@ -113,23 +105,29 @@ static struct console scif_console = {
.index = -1,
};
#if defined(CONFIG_CPU_SH4) && !defined(CONFIG_SH_STANDARD_BIOS)
/*
* Simple SCIF init, primarily aimed at SH7750 and other similar SH-4
* devices that aren't using sh-ipl+g.
*/
static void scif_sercon_init(int baud)
{
ctrl_outw(0, SCIF_REG + 8);
ctrl_outw(0, SCIF_REG);
ctrl_outw(0, scif_port.mapbase + 8);
ctrl_outw(0, scif_port.mapbase);
/* Set baud rate */
ctrl_outb((CONFIG_SH_PCLK_FREQ + 16 * baud) /
(32 * baud) - 1, SCIF_REG + 4);
(32 * baud) - 1, scif_port.mapbase + 4);
ctrl_outw(12, SCIF_REG + 24);
ctrl_outw(8, SCIF_REG + 24);
ctrl_outw(0, SCIF_REG + 32);
ctrl_outw(0x60, SCIF_REG + 16);
ctrl_outw(0, SCIF_REG + 36);
ctrl_outw(0x30, SCIF_REG + 8);
ctrl_outw(12, scif_port.mapbase + 24);
ctrl_outw(8, scif_port.mapbase + 24);
ctrl_outw(0, scif_port.mapbase + 32);
ctrl_outw(0x60, scif_port.mapbase + 16);
ctrl_outw(0, scif_port.mapbase + 36);
ctrl_outw(0x30, scif_port.mapbase + 8);
}
#endif
#endif /* CONFIG_CPU_SH4 && !CONFIG_SH_STANDARD_BIOS */
#endif /* CONFIG_EARLY_SCIF_CONSOLE */
/*
* Setup a default console, if more than one is compiled in, rely on the
@ -168,7 +166,7 @@ int __init setup_early_printk(char *opt)
if (!strncmp(buf, "serial", 6)) {
early_console = &scif_console;
#ifdef CONFIG_CPU_SH4
#if defined(CONFIG_CPU_SH4) && !defined(CONFIG_SH_STANDARD_BIOS)
scif_sercon_init(115200);
#endif
}