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pm.c

/*
 * Generic Power Management Routine
 *
 * Copyright (c) 2006 Andriy Skulysh <askulsyh@gmail.com>
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License.
 */
#include <linux/suspend.h>
#include <linux/delay.h>
#include <linux/gfp.h>
#include <asm/freq.h>
#include <asm/io.h>
#include <asm/watchdog.h>
#include <asm/pm.h>

#define INTR_OFFSET     0x600

#define STBCR           0xffffff82
#define STBCR2          0xffffff88

#define STBCR_STBY      0x80
#define STBCR_MSTP2     0x04

#define MCR       0xffffff68
#define RTCNT           0xffffff70

#define MCR_RMODE 2
#define MCR_RFSH  4

void pm_enter(void)
{
      u8 stbcr, csr;
      u16 frqcr, mcr;
      u32 vbr_new, vbr_old;

      set_bl_bit();

      /* set wdt */
      csr = sh_wdt_read_csr();
      csr &= ~WTCSR_TME;
      csr |= WTCSR_CKS_4096;
      sh_wdt_write_csr(csr);
      csr = sh_wdt_read_csr();
      sh_wdt_write_cnt(0);

      /* disable PLL1 */
      frqcr = ctrl_inw(FRQCR);
      frqcr &= ~(FRQCR_PLLEN | FRQCR_PSTBY);
      ctrl_outw(frqcr, FRQCR);

      /* enable standby */
      stbcr = ctrl_inb(STBCR);
      ctrl_outb(stbcr | STBCR_STBY | STBCR_MSTP2, STBCR);

      /* set self-refresh */
      mcr = ctrl_inw(MCR);
      ctrl_outw(mcr & ~MCR_RFSH, MCR);

      /* set interrupt handler */
      asm volatile("stc vbr, %0" : "=r" (vbr_old));
      vbr_new = get_zeroed_page(GFP_ATOMIC);
      udelay(50);
      memcpy((void*)(vbr_new + INTR_OFFSET),
             &wakeup_start, &wakeup_end - &wakeup_start);
      asm volatile("ldc %0, vbr" : : "r" (vbr_new));

      ctrl_outw(0, RTCNT);
      ctrl_outw(mcr | MCR_RFSH | MCR_RMODE, MCR);

      cpu_sleep();

      asm volatile("ldc %0, vbr" : : "r" (vbr_old));

      free_page(vbr_new);

      /* enable PLL1 */
      frqcr = ctrl_inw(FRQCR);
      frqcr |= FRQCR_PSTBY;
      ctrl_outw(frqcr, FRQCR);
      udelay(50);
      frqcr |= FRQCR_PLLEN;
      ctrl_outw(frqcr, FRQCR);

      ctrl_outb(stbcr, STBCR);

      clear_bl_bit();
}

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