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Linux/arch/arm/mach-imx/pm-imx27.c

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  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 
 14 #include "hardware.h"
 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 */
 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                 cpu_do_idle();
 27                 break;
 28 
 29         default:
 30                 return -EINVAL;
 31         }
 32         return 0;
 33 }
 34 
 35 static const struct platform_suspend_ops mx27_suspend_ops = {
 36         .enter = mx27_suspend_enter,
 37         .valid = suspend_valid_only_mem,
 38 };
 39 
 40 static int __init mx27_pm_init(void)
 41 {
 42         if (!cpu_is_mx27())
 43                 return 0;
 44 
 45         suspend_set_ops(&mx27_suspend_ops);
 46         return 0;
 47 }
 48 
 49 device_initcall(mx27_pm_init);
 50 

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