Commit 6fc21b82 authored by Paul Mundt's avatar Paul Mundt
Browse files

sh: More flexible + SH7780 earlyprintk SCIF support. 



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: default avatarPaul Mundt <lethal@linux-sh.org>
parent 510c72ad

arch/sh/Kconfig.debug

+17 −1
Original line number Diff line number Diff line
@@ -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

arch/sh/kernel/early_printk.c

+21 −23
Original line number Diff line number Diff line
@@ -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);



	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);

		  (32 * baud) - 1, scif_port.mapbase + 4);



	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

	}

drivers/serial/sh-sci.h

+1 −0
Original line number Diff line number Diff line
@@ -379,6 +379,7 @@ SCIx_FNS(SCxSR, 0x08, 8, 0x10, 8, 0x08, 16, 0x10, 16, 0x04, 8) 
SCIx_FNS(SCxRDR, 0x0a,  8, 0x14,  8, 0x0A,  8, 0x14,  8, 0x05,  8)

SCIF_FNS(SCFCR,                      0x0c,  8, 0x18, 16)

#if defined(CONFIG_CPU_SUBTYPE_SH7760) || defined(CONFIG_CPU_SUBTYPE_SH7780)

SCIF_FNS(SCFDR,			     0x0e, 16, 0x1C, 16)

SCIF_FNS(SCTFDR,		     0x0e, 16, 0x1C, 16)

SCIF_FNS(SCRFDR,		     0x0e, 16, 0x20, 16)

SCIF_FNS(SCSPTR,			0,  0, 0x24, 16)

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