arch/arm/mach-imx/pm-imx3.c

   1 /*
   2  *  Copyright (C) 2012 Freescale Semiconductor, Inc. All Rights Reserved.
   3  *
   4  * The code contained herein is licensed under the GNU General Public
   5  * License. You may obtain a copy of the GNU General Public License
   6  * Version 2 or later at the following locations:
   7  *
   8  * http://www.opensource.org/licenses/gpl-license.html
   9  * http://www.gnu.org/copyleft/gpl.html
  10  */
  11 #include <linux/io.h>
  12 #include <mach/common.h>
  13 #include <mach/hardware.h>
  14 #include <mach/devices-common.h>
  15 #include "crmregs-imx3.h"
  16
  17 /*
  18  * Set cpu low power mode before WFI instruction. This function is called
  19  * mx3 because it can be used for mx31 and mx35.
  20  * Currently only WAIT_MODE is supported.
  21  */
  22 void mx3_cpu_lp_set(enum mx3_cpu_pwr_mode mode)
  23 {
  24         int reg = __raw_readl(mx3_ccm_base + MXC_CCM_CCMR);
  25         reg &= ~MXC_CCM_CCMR_LPM_MASK;
  26
  27         switch (mode) {
  28         case MX3_WAIT:
  29                 if (cpu_is_mx35())
  30                         reg |= MXC_CCM_CCMR_LPM_WAIT_MX35;
  31                 __raw_writel(reg, mx3_ccm_base + MXC_CCM_CCMR);
  32                 break;
  33         default:
  34                 pr_err("Unknown cpu power mode: %d\n", mode);
  35                 return;
  36         }
  37 }