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// SPDX-License-Identifier: GPL-2.0
/*
* hp6x0 Power Management Routines
*
* Copyright (c) 2006 Andriy Skulysh <askulsyh@gmail.com>
*/
#include <linux/init.h>
#include <linux/suspend.h>
#include <linux/errno.h>
#include <linux/time.h>
#include <linux/delay.h>
#include <linux/gfp.h>
#include <asm/io.h>
#include <asm/hd64461.h>
#include <asm/bl_bit.h>
#include <mach/hp6xx.h>
#include <cpu/dac.h>
#include <asm/freq.h>
#include <asm/watchdog.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
extern u8 wakeup_start;
extern u8 wakeup_end;
static 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 = __raw_readw(FRQCR);
frqcr &= ~(FRQCR_PLLEN | FRQCR_PSTBY);
__raw_writew(frqcr, FRQCR);
/* enable standby */
stbcr = __raw_readb(STBCR);
__raw_writeb(stbcr | STBCR_STBY | STBCR_MSTP2, STBCR);
/* set self-refresh */
mcr = __raw_readw(MCR);
__raw_writew(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));
__raw_writew(0, RTCNT);
__raw_writew(mcr | MCR_RFSH | MCR_RMODE, MCR);
cpu_sleep();
asm volatile("ldc %0, vbr" : : "r" (vbr_old));
free_page(vbr_new);
/* enable PLL1 */
frqcr = __raw_readw(FRQCR);
frqcr |= FRQCR_PSTBY;
__raw_writew(frqcr, FRQCR);
udelay(50);
frqcr |= FRQCR_PLLEN;
__raw_writew(frqcr, FRQCR);
__raw_writeb(stbcr, STBCR);
clear_bl_bit();
}
static int hp6x0_pm_enter(suspend_state_t state)
{
u8 stbcr, stbcr2;
#ifdef CONFIG_HD64461_ENABLER
u8 scr;
u16 hd64461_stbcr;
#endif
#ifdef CONFIG_HD64461_ENABLER
outb(0, HD64461_PCC1CSCIER);
scr = inb(HD64461_PCC1SCR);
scr |= HD64461_PCCSCR_VCC1;
outb(scr, HD64461_PCC1SCR);
hd64461_stbcr = inw(HD64461_STBCR);
hd64461_stbcr |= HD64461_STBCR_SPC1ST;
outw(hd64461_stbcr, HD64461_STBCR);
#endif
__raw_writeb(0x1f, DACR);
stbcr = __raw_readb(STBCR);
__raw_writeb(0x01, STBCR);
stbcr2 = __raw_readb(STBCR2);
__raw_writeb(0x7f , STBCR2);
outw(0xf07f, HD64461_SCPUCR);
pm_enter();
outw(0, HD64461_SCPUCR);
__raw_writeb(stbcr, STBCR);
__raw_writeb(stbcr2, STBCR2);
#ifdef CONFIG_HD64461_ENABLER
hd64461_stbcr = inw(HD64461_STBCR);
hd64461_stbcr &= ~HD64461_STBCR_SPC1ST;
outw(hd64461_stbcr, HD64461_STBCR);
outb(0x4c, HD64461_PCC1CSCIER);
outb(0x00, HD64461_PCC1CSCR);
#endif
return 0;
}
static const struct platform_suspend_ops hp6x0_pm_ops = {
.enter = hp6x0_pm_enter,
.valid = suspend_valid_only_mem,
};
static int __init hp6x0_pm_init(void)
{
suspend_set_ops(&hp6x0_pm_ops);
return 0;
}
late_initcall(hp6x0_pm_init);
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