arch/arm/mach-mxc91231/system.c

   1 /*
   2  * Copyright 2009 Dmitriy Taychenachev <dimichxp@gmail.com>
   3  *
   4  * This file is released under the GPLv2 or later.
   5  */
   6
   7 #include <linux/delay.h>
   8 #include <linux/io.h>
   9
  10 #include <asm/proc-fns.h>
  11 #include <mach/hardware.h>
  12
  13 #include "crm_regs.h"
  14
  15 #define WDOG_WCR                MXC91231_IO_ADDRESS(MXC91231_WDOG1_BASE_ADDR)
  16 #define WDOG_WCR_OUT_ENABLE     (1 << 6)
  17 #define WDOG_WCR_ASSERT         (1 << 5)
  18
  19 void mxc91231_power_off(void)
  20 {
  21         u16 wcr;
  22
  23         wcr = __raw_readw(WDOG_WCR);
  24         wcr |= WDOG_WCR_OUT_ENABLE;
  25         wcr &= ~WDOG_WCR_ASSERT;
  26         __raw_writew(wcr, WDOG_WCR);
  27 }
  28
  29 void mxc91231_arch_reset(char mode, const char *cmd)
  30 {
  31         u32 amcr;
  32
  33         /* Reset the AP using CRM */
  34         amcr = __raw_readl(MXC_CRMAP_AMCR);
  35         amcr &= ~MXC_CRMAP_AMCR_SW_AP;
  36         __raw_writel(amcr, MXC_CRMAP_AMCR);
  37
  38         mdelay(10);
  39         cpu_reset(0);
  40 }
  41
  42 void mxc91231_prepare_idle(void)
  43 {
  44         u32 crm_ctl;
  45
  46         /* Go to WAIT mode after WFI */
  47         crm_ctl = __raw_readl(MXC_DSM_CRM_CONTROL);
  48         crm_ctl &= ~(MXC_DSM_CRM_CTRL_LPMD0 | MXC_DSM_CRM_CTRL_LPMD1);
  49         crm_ctl |=  MXC_DSM_CRM_CTRL_LPMD_WAIT_MODE;
  50         __raw_writel(crm_ctl, MXC_DSM_CRM_CONTROL);
  51 }