1 /* arch/arm/mach-s3c2410/include/mach/system.h
2  *
3  * Copyright (c) 2003 Simtec Electronics
4  *	Ben Dooks <ben@simtec.co.uk>
5  *
6  * S3C2410 - System function defines and includes
7  *
8  * This program is free software; you can redistribute it and/or modify
9  * it under the terms of the GNU General Public License version 2 as
10  * published by the Free Software Foundation.
11 */
12 
13 #include <linux/io.h>
14 #include <mach/hardware.h>
15 
16 #include <mach/map.h>
17 #include <mach/idle.h>
18 
19 #include <mach/regs-clock.h>
20 
21 void (*s3c24xx_idle)(void);
22 
s3c24xx_default_idle(void)23 void s3c24xx_default_idle(void)
24 {
25 	unsigned long tmp;
26 	int i;
27 
28 	/* idle the system by using the idle mode which will wait for an
29 	 * interrupt to happen before restarting the system.
30 	 */
31 
32 	/* Warning: going into idle state upsets jtag scanning */
33 
34 	__raw_writel(__raw_readl(S3C2410_CLKCON) | S3C2410_CLKCON_IDLE,
35 		     S3C2410_CLKCON);
36 
37 	/* the samsung port seems to do a loop and then unset idle.. */
38 	for (i = 0; i < 50; i++) {
39 		tmp += __raw_readl(S3C2410_CLKCON); /* ensure loop not optimised out */
40 	}
41 
42 	/* this bit is not cleared on re-start... */
43 
44 	__raw_writel(__raw_readl(S3C2410_CLKCON) & ~S3C2410_CLKCON_IDLE,
45 		     S3C2410_CLKCON);
46 }
47 
arch_idle(void)48 static void arch_idle(void)
49 {
50 	if (s3c24xx_idle != NULL)
51 		(s3c24xx_idle)();
52 	else
53 		s3c24xx_default_idle();
54 }
55