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
  13 #include "common.h"
  14 #include "crmregs-imx3.h"
  15 #include "devices/devices-common.h"
  16 #include "hardware.h"
  17
  18 /*
  19  * Set cpu low power mode before WFI instruction. This function is called
  20  * mx3 because it can be used for mx31 and mx35.
  21  * Currently only WAIT_MODE is supported.
  22  */
  23 void mx3_cpu_lp_set(enum mx3_cpu_pwr_mode mode)
  24 {
  25         int reg = __raw_readl(mx3_ccm_base + MXC_CCM_CCMR);
  26         reg &= ~MXC_CCM_CCMR_LPM_MASK;
  27
  28         switch (mode) {
  29         case MX3_WAIT:
  30                 if (cpu_is_mx35())
  31                         reg |= MXC_CCM_CCMR_LPM_WAIT_MX35;
  32                 __raw_writel(reg, mx3_ccm_base + MXC_CCM_CCMR);
  33                 break;
  34         default:
  35                 pr_err("Unknown cpu power mode: %d\n", mode);
  36                 return;
  37         }
  38 }