[linux-2.6-block.git] / arch / arm / mach-imx / pm-imx27.c

/*
 * i.MX27 Power Management Routines
 *
 * Based on Freescale's BSP
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License.
 */

#include <linux/kernel.h>
#include <linux/suspend.h>
#include <linux/io.h>

#include "hardware.h"

static int mx27_suspend_enter(suspend_state_t state)
{
	u32 cscr;
	switch (state) {
	case PM_SUSPEND_MEM:
		/* Clear MPEN and SPEN to disable MPLL/SPLL */
		cscr = imx_readl(MX27_IO_ADDRESS(MX27_CCM_BASE_ADDR));
		cscr &= 0xFFFFFFFC;
		imx_writel(cscr, MX27_IO_ADDRESS(MX27_CCM_BASE_ADDR));
		/* Executes WFI */
		cpu_do_idle();
		break;

	default:
		return -EINVAL;
	}
	return 0;
}

static const struct platform_suspend_ops mx27_suspend_ops = {
	.enter = mx27_suspend_enter,
	.valid = suspend_valid_only_mem,
};

static int __init mx27_pm_init(void)
{
	if (!cpu_is_mx27())
		return 0;

	suspend_set_ops(&mx27_suspend_ops);
	return 0;
}

device_initcall(mx27_pm_init);
Commit	Line	Data
f42ae0e9 EB	1	/*
	2	* i.MX27 Power Management Routines
	3	*
	4	* Based on Freescale's BSP
	5	*
	6	* This program is free software; you can redistribute it and/or
	7	* modify it under the terms of the GNU General Public License.
	8	*/
	9
	10	#include <linux/kernel.h>
	11	#include <linux/suspend.h>
	12	#include <linux/io.h>
50f2de61 SG	13
50f2de61 SG	14	#include "hardware.h"
f42ae0e9 EB	15
	16	static int mx27_suspend_enter(suspend_state_t state)
	17	{
	18	u32 cscr;
	19	switch (state) {
	20	case PM_SUSPEND_MEM:
	21	/* Clear MPEN and SPEN to disable MPLL/SPLL */
c553138f	22	cscr = imx_readl(MX27_IO_ADDRESS(MX27_CCM_BASE_ADDR));
f42ae0e9	23	cscr &= 0xFFFFFFFC;
c553138f	24	imx_writel(cscr, MX27_IO_ADDRESS(MX27_CCM_BASE_ADDR));
f42ae0e9	25	/* Executes WFI */
4a3ea244	26	cpu_do_idle();
f42ae0e9 EB	27	break;
	28
	29	default:
	30	return -EINVAL;
	31	}
	32	return 0;
	33	}
	34
2f55ac07	35	static const struct platform_suspend_ops mx27_suspend_ops = {
f42ae0e9 EB	36	.enter = mx27_suspend_enter,
	37	.valid = suspend_valid_only_mem,
	38	};
	39
	40	static int __init mx27_pm_init(void)
	41	{
76586d35 SH	42	if (!cpu_is_mx27())
	43	return 0;
	44
f42ae0e9 EB	45	suspend_set_ops(&mx27_suspend_ops);
	46	return 0;
	47	}
	48
	49	device_initcall(mx27_pm_init);