/* linux/include/asm-arm/arch-s3c2410/system.h
*
- * (c) 2003 Simtec Electronics
- * Ben Dooks <ben@simtec.co.uk>
+ * Copyright (c) 2003 Simtec Electronics
+ * Ben Dooks <ben@simtec.co.uk>
*
* S3C2410 - System function defines and includes
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2 as
* published by the Free Software Foundation.
- *
- * Changelog:
- * 12-May-2003 BJD Created file
- * 14-May-2003 BJD Removed idle to aid debugging
- * 12-Jun-2003 BJD Added reset via watchdog
- * 04-Sep-2003 BJD Moved to v2.6
- * 28-Oct-2004 BJD Added over-ride for idle, and fixed reset panic()
- */
+*/
#include <asm/hardware.h>
#include <asm/io.h>
#include <asm/arch/map.h>
#include <asm/arch/idle.h>
+#include <asm/arch/reset.h>
-#include <asm/arch/regs-watchdog.h>
+#include <asm/plat-s3c/regs-watchdog.h>
#include <asm/arch/regs-clock.h>
+#include <linux/clk.h>
+#include <linux/err.h>
+
void (*s3c24xx_idle)(void);
+void (*s3c24xx_reset_hook)(void);
void s3c24xx_default_idle(void)
{
- void __iomem *reg = S3C2410_CLKCON;
unsigned long tmp;
int i;
/* Warning: going into idle state upsets jtag scanning */
- __raw_writel(__raw_readl(reg) | (1<<2), reg);
+ __raw_writel(__raw_readl(S3C2410_CLKCON) | S3C2410_CLKCON_IDLE,
+ S3C2410_CLKCON);
/* the samsung port seems to do a loop and then unset idle.. */
for (i = 0; i < 50; i++) {
- tmp += __raw_readl(reg); /* ensure loop not optimised out */
+ tmp += __raw_readl(S3C2410_CLKCON); /* ensure loop not optimised out */
}
/* this bit is not cleared on re-start... */
- __raw_writel(__raw_readl(reg) & ~(1<<2), reg);
+ __raw_writel(__raw_readl(S3C2410_CLKCON) & ~S3C2410_CLKCON_IDLE,
+ S3C2410_CLKCON);
}
static void arch_idle(void)
s3c24xx_default_idle();
}
-
static void
arch_reset(char mode)
{
+ struct clk *wdtclk;
+
if (mode == 's') {
cpu_reset(0);
}
+ if (s3c24xx_reset_hook)
+ s3c24xx_reset_hook();
+
printk("arch_reset: attempting watchdog reset\n");
__raw_writel(0, S3C2410_WTCON); /* disable watchdog, to be safe */
+ wdtclk = clk_get(NULL, "watchdog");
+ if (!IS_ERR(wdtclk)) {
+ clk_enable(wdtclk);
+ } else
+ printk(KERN_WARNING "%s: warning: cannot get watchdog clock\n", __func__);
+
/* put initial values into count and data */
- __raw_writel(0x100, S3C2410_WTCNT);
- __raw_writel(0x100, S3C2410_WTDAT);
+ __raw_writel(0x80, S3C2410_WTCNT);
+ __raw_writel(0x80, S3C2410_WTDAT);
/* set the watchdog to go and reset... */
__raw_writel(S3C2410_WTCON_ENABLE|S3C2410_WTCON_DIV16|S3C2410_WTCON_RSTEN |
- S3C2410_WTCON_PRESCALE(0x80), S3C2410_WTCON);
+ S3C2410_WTCON_PRESCALE(0x20), S3C2410_WTCON);
/* wait for reset to assert... */
- mdelay(5000);
+ mdelay(500);
printk(KERN_ERR "Watchdog reset failed to assert reset\n");
+ /* delay to allow the serial port to show the message */
+ mdelay(50);
+
/* we'll take a jump through zero as a poor second */
cpu_reset(0);
}