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> 13#include <mach/system.h> 14#include <mach/mx27.h> 15 16static 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 */ 22 cscr = __raw_readl(MX27_IO_ADDRESS(MX27_CCM_BASE_ADDR)); 23 cscr &= 0xFFFFFFFC; 24 __raw_writel(cscr, MX27_IO_ADDRESS(MX27_CCM_BASE_ADDR)); 25 /* Executes WFI */ 26 arch_idle(); 27 break; 28 29 default: 30 return -EINVAL; 31 } 32 return 0; 33} 34 35static struct platform_suspend_ops mx27_suspend_ops = { 36 .enter = mx27_suspend_enter, 37 .valid = suspend_valid_only_mem, 38}; 39 40static int __init mx27_pm_init(void) 41{ 42 suspend_set_ops(&mx27_suspend_ops); 43 return 0; 44} 45 46device_initcall(mx27_pm_init); 47