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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 <lethal@linux-sh.org>
This commit is contained in:
Paul Mundt
2006-11-27 12:10:23 +09:00
parent 510c72ad2d
commit 6fc21b82ef
3 changed files with 38 additions and 23 deletions
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42
arch/sh/kernel/early_printk.c
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@@ -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
}