arch/sh/boards/mach-hp6xx/pm.c

   1 // SPDX-License-Identifier: GPL-2.0
   2 /*
   3  * hp6x0 Power Management Routines
   4  *
   5  * Copyright (c) 2006 Andriy Skulysh <askulsyh@gmail.com>
   6  */
   7 #include <linux/init.h>
   8 #include <linux/suspend.h>
   9 #include <linux/errno.h>
  10 #include <linux/time.h>
  11 #include <linux/delay.h>
  12 #include <linux/gfp.h>
  13 #include <asm/io.h>
  14 #include <asm/hd64461.h>
  15 #include <asm/bl_bit.h>
  16 #include <mach/hp6xx.h>
  17 #include <cpu/dac.h>
  18 #include <asm/freq.h>
  19 #include <asm/watchdog.h>
  20
  21 #define INTR_OFFSET     0x600
  22
  23 #define STBCR           0xffffff82
  24 #define STBCR2          0xffffff88
  25
  26 #define STBCR_STBY      0x80
  27 #define STBCR_MSTP2     0x04
  28
  29 #define MCR             0xffffff68
  30 #define RTCNT           0xffffff70
  31
  32 #define MCR_RMODE       2
  33 #define MCR_RFSH        4
  34
  35 extern u8 wakeup_start;
  36 extern u8 wakeup_end;
  37
  38 static void pm_enter(void)
  39 {
  40         u8 stbcr, csr;
  41         u16 frqcr, mcr;
  42         u32 vbr_new, vbr_old;
  43
  44         set_bl_bit();
  45
  46         /* set wdt */
  47         csr = sh_wdt_read_csr();
  48         csr &= ~WTCSR_TME;
  49         csr |= WTCSR_CKS_4096;
  50         sh_wdt_write_csr(csr);
  51         csr = sh_wdt_read_csr();
  52         sh_wdt_write_cnt(0);
  53
  54         /* disable PLL1 */
  55         frqcr = __raw_readw(FRQCR);
  56         frqcr &= ~(FRQCR_PLLEN | FRQCR_PSTBY);
  57         __raw_writew(frqcr, FRQCR);
  58
  59         /* enable standby */
  60         stbcr = __raw_readb(STBCR);
  61         __raw_writeb(stbcr | STBCR_STBY | STBCR_MSTP2, STBCR);
  62
  63         /* set self-refresh */
  64         mcr = __raw_readw(MCR);
  65         __raw_writew(mcr & ~MCR_RFSH, MCR);
  66
  67         /* set interrupt handler */
  68         asm volatile("stc vbr, %0" : "=r" (vbr_old));
  69         vbr_new = get_zeroed_page(GFP_ATOMIC);
  70         udelay(50);
  71         memcpy((void*)(vbr_new + INTR_OFFSET),
  72                &wakeup_start, &wakeup_end - &wakeup_start);
  73         asm volatile("ldc %0, vbr" : : "r" (vbr_new));
  74
  75         __raw_writew(0, RTCNT);
  76         __raw_writew(mcr | MCR_RFSH | MCR_RMODE, MCR);
  77
  78         cpu_sleep();
  79
  80         asm volatile("ldc %0, vbr" : : "r" (vbr_old));
  81
  82         free_page(vbr_new);
  83
  84         /* enable PLL1 */
  85         frqcr = __raw_readw(FRQCR);
  86         frqcr |= FRQCR_PSTBY;
  87         __raw_writew(frqcr, FRQCR);
  88         udelay(50);
  89         frqcr |= FRQCR_PLLEN;
  90         __raw_writew(frqcr, FRQCR);
  91
  92         __raw_writeb(stbcr, STBCR);
  93
  94         clear_bl_bit();
  95 }
  96
  97 static int hp6x0_pm_enter(suspend_state_t state)
  98 {
  99         u8 stbcr, stbcr2;
 100 #ifdef CONFIG_HD64461_ENABLER
 101         u8 scr;
 102         u16 hd64461_stbcr;
 103 #endif
 104
 105 #ifdef CONFIG_HD64461_ENABLER
 106         outb(0, HD64461_PCC1CSCIER);
 107
 108         scr = inb(HD64461_PCC1SCR);
 109         scr |= HD64461_PCCSCR_VCC1;
 110         outb(scr, HD64461_PCC1SCR);
 111
 112         hd64461_stbcr = inw(HD64461_STBCR);
 113         hd64461_stbcr |= HD64461_STBCR_SPC1ST;
 114         outw(hd64461_stbcr, HD64461_STBCR);
 115 #endif
 116
 117         __raw_writeb(0x1f, DACR);
 118
 119         stbcr = __raw_readb(STBCR);
 120         __raw_writeb(0x01, STBCR);
 121
 122         stbcr2 = __raw_readb(STBCR2);
 123         __raw_writeb(0x7f , STBCR2);
 124
 125         outw(0xf07f, HD64461_SCPUCR);
 126
 127         pm_enter();
 128
 129         outw(0, HD64461_SCPUCR);
 130         __raw_writeb(stbcr, STBCR);
 131         __raw_writeb(stbcr2, STBCR2);
 132
 133 #ifdef CONFIG_HD64461_ENABLER
 134         hd64461_stbcr = inw(HD64461_STBCR);
 135         hd64461_stbcr &= ~HD64461_STBCR_SPC1ST;
 136         outw(hd64461_stbcr, HD64461_STBCR);
 137
 138         outb(0x4c, HD64461_PCC1CSCIER);
 139         outb(0x00, HD64461_PCC1CSCR);
 140 #endif
 141
 142         return 0;
 143 }
 144
 145 static const struct platform_suspend_ops hp6x0_pm_ops = {
 146         .enter          = hp6x0_pm_enter,
 147         .valid          = suspend_valid_only_mem,
 148 };
 149
 150 static int __init hp6x0_pm_init(void)
 151 {
 152         suspend_set_ops(&hp6x0_pm_ops);
 153         return 0;
 154 }
 155
 156 late_initcall(hp6x0_pm_init);