Orange Pi5 kernel

^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   1) // SPDX-License-Identifier: GPL-2.0
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   2) //
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   3) // Copyright (c) 2010-2014 Samsung Electronics Co., Ltd.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   4) //		http://www.samsung.com
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   5) //
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   6) // S5PV210 - Power Management support
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   7) //
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   8) // Based on arch/arm/mach-s3c2410/pm.c
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   9) // Copyright (c) 2006 Simtec Electronics
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  10) //	Ben Dooks <ben@simtec.co.uk>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  11) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  12) #include <linux/init.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  13) #include <linux/suspend.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  14) #include <linux/syscore_ops.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  15) #include <linux/io.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  16) #include <linux/soc/samsung/s3c-pm.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  17) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  18) #include <asm/cacheflush.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  19) #include <asm/suspend.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  20) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  21) #include "common.h"
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  22) #include "regs-clock.h"
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  23) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  24) /* helper functions to save and restore register state */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  25) struct sleep_save {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  26) 	void __iomem	*reg;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  27) 	unsigned long	val;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  28) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  29) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  30) #define SAVE_ITEM(x) \
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  31) 	{ .reg = (x) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  32) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  33) /**
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  34)  * s3c_pm_do_save() - save a set of registers for restoration on resume.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  35)  * @ptr: Pointer to an array of registers.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  36)  * @count: Size of the ptr array.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  37)  *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  38)  * Run through the list of registers given, saving their contents in the
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  39)  * array for later restoration when we wakeup.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  40)  */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  41) static void s3c_pm_do_save(struct sleep_save *ptr, int count)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  42) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  43) 	for (; count > 0; count--, ptr++) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  44) 		ptr->val = readl_relaxed(ptr->reg);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  45) 		S3C_PMDBG("saved %p value %08lx\n", ptr->reg, ptr->val);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  46) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  47) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  48) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  49) /**
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  50)  * s3c_pm_do_restore() - restore register values from the save list.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  51)  * @ptr: Pointer to an array of registers.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  52)  * @count: Size of the ptr array.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  53)  *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  54)  * Restore the register values saved from s3c_pm_do_save().
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  55)  *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  56)  * WARNING: Do not put any debug in here that may effect memory or use
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  57)  * peripherals, as things may be changing!
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  58) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  59) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  60) static void s3c_pm_do_restore_core(const struct sleep_save *ptr, int count)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  61) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  62) 	for (; count > 0; count--, ptr++)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  63) 		writel_relaxed(ptr->val, ptr->reg);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  64) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  65) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  66) static struct sleep_save s5pv210_core_save[] = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  67) 	/* Clock ETC */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  68) 	SAVE_ITEM(S5P_MDNIE_SEL),
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  69) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  70) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  71) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  72)  * VIC wake-up support (TODO)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  73)  */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  74) static u32 s5pv210_irqwake_intmask = 0xffffffff;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  75) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  76) static u32 s5pv210_read_eint_wakeup_mask(void)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  77) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  78) 	return __raw_readl(S5P_EINT_WAKEUP_MASK);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  79) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  80) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  81) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  82)  * Suspend helpers.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  83)  */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  84) static int s5pv210_cpu_suspend(unsigned long arg)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  85) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  86) 	unsigned long tmp;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  87) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  88) 	/* issue the standby signal into the pm unit. Note, we
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  89) 	 * issue a write-buffer drain just in case */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  90) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  91) 	tmp = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  92) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  93) 	asm("b 1f\n\t"
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  94) 	    ".align 5\n\t"
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  95) 	    "1:\n\t"
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  96) 	    "mcr p15, 0, %0, c7, c10, 5\n\t"
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  97) 	    "mcr p15, 0, %0, c7, c10, 4\n\t"
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  98) 	    "wfi" : : "r" (tmp));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  99) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 100) 	pr_info("Failed to suspend the system\n");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 101) 	return 1; /* Aborting suspend */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 102) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 103) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 104) static void s5pv210_pm_prepare(void)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 105) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 106) 	unsigned int tmp;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 107) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 108) 	/*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 109) 	 * Set wake-up mask registers
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 110) 	 * S5P_EINT_WAKEUP_MASK is set by pinctrl driver in late suspend.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 111) 	 */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 112) 	__raw_writel(s5pv210_irqwake_intmask, S5P_WAKEUP_MASK);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 113) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 114) 	/* ensure at least INFORM0 has the resume address */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 115) 	__raw_writel(__pa_symbol(s5pv210_cpu_resume), S5P_INFORM0);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 116) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 117) 	tmp = __raw_readl(S5P_SLEEP_CFG);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 118) 	tmp &= ~(S5P_SLEEP_CFG_OSC_EN | S5P_SLEEP_CFG_USBOSC_EN);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 119) 	__raw_writel(tmp, S5P_SLEEP_CFG);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 120) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 121) 	/* WFI for SLEEP mode configuration by SYSCON */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 122) 	tmp = __raw_readl(S5P_PWR_CFG);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 123) 	tmp &= S5P_CFG_WFI_CLEAN;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 124) 	tmp |= S5P_CFG_WFI_SLEEP;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 125) 	__raw_writel(tmp, S5P_PWR_CFG);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 126) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 127) 	/* SYSCON interrupt handling disable */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 128) 	tmp = __raw_readl(S5P_OTHERS);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 129) 	tmp |= S5P_OTHER_SYSC_INTOFF;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 130) 	__raw_writel(tmp, S5P_OTHERS);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 131) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 132) 	s3c_pm_do_save(s5pv210_core_save, ARRAY_SIZE(s5pv210_core_save));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 133) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 134) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 135) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 136)  * Suspend operations.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 137)  */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 138) static int s5pv210_suspend_enter(suspend_state_t state)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 139) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 140) 	u32 eint_wakeup_mask = s5pv210_read_eint_wakeup_mask();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 141) 	int ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 142) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 143) 	S3C_PMDBG("%s: suspending the system...\n", __func__);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 144) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 145) 	S3C_PMDBG("%s: wakeup masks: %08x,%08x\n", __func__,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 146) 			s5pv210_irqwake_intmask, eint_wakeup_mask);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 147) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 148) 	if (s5pv210_irqwake_intmask == -1U
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 149) 	    && eint_wakeup_mask == -1U) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 150) 		pr_err("%s: No wake-up sources!\n", __func__);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 151) 		pr_err("%s: Aborting sleep\n", __func__);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 152) 		return -EINVAL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 153) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 154) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 155) 	s3c_pm_save_uarts(false);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 156) 	s5pv210_pm_prepare();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 157) 	flush_cache_all();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 158) 	s3c_pm_check_store();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 159) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 160) 	ret = cpu_suspend(0, s5pv210_cpu_suspend);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 161) 	if (ret)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 162) 		return ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 163) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 164) 	s3c_pm_restore_uarts(false);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 165) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 166) 	S3C_PMDBG("%s: wakeup stat: %08x\n", __func__,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 167) 			__raw_readl(S5P_WAKEUP_STAT));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 168) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 169) 	s3c_pm_check_restore();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 170) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 171) 	S3C_PMDBG("%s: resuming the system...\n", __func__);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 172) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 173) 	return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 174) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 175) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 176) static int s5pv210_suspend_prepare(void)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 177) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 178) 	s3c_pm_check_prepare();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 179) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 180) 	return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 181) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 182) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 183) static void s5pv210_suspend_finish(void)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 184) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 185) 	s3c_pm_check_cleanup();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 186) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 187) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 188) static const struct platform_suspend_ops s5pv210_suspend_ops = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 189) 	.enter		= s5pv210_suspend_enter,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 190) 	.prepare	= s5pv210_suspend_prepare,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 191) 	.finish		= s5pv210_suspend_finish,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 192) 	.valid		= suspend_valid_only_mem,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 193) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 194) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 195) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 196)  * Syscore operations used to delay restore of certain registers.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 197)  */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 198) static void s5pv210_pm_resume(void)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 199) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 200) 	s3c_pm_do_restore_core(s5pv210_core_save, ARRAY_SIZE(s5pv210_core_save));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 201) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 202) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 203) static struct syscore_ops s5pv210_pm_syscore_ops = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 204) 	.resume		= s5pv210_pm_resume,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 205) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 206) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 207) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 208)  * Initialization entry point.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 209)  */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 210) void __init s5pv210_pm_init(void)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 211) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 212) 	register_syscore_ops(&s5pv210_pm_syscore_ops);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 213) 	suspend_set_ops(&s5pv210_suspend_ops);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 214) }