LXR linux/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 */
  23void 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}
  39