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- // SPDX-License-Identifier: GPL-2.0
- //
- // Copyright (c) 2010-2014 Samsung Electronics Co., Ltd.
- // http://www.samsung.com
- //
- // S5PV210 - Power Management support
- //
- // Based on arch/arm/mach-s3c2410/pm.c
- // Copyright (c) 2006 Simtec Electronics
- // Ben Dooks <[email protected]>
- #include <linux/init.h>
- #include <linux/suspend.h>
- #include <linux/syscore_ops.h>
- #include <linux/io.h>
- #include <linux/soc/samsung/s3c-pm.h>
- #include <asm/cacheflush.h>
- #include <asm/suspend.h>
- #include "common.h"
- #include "regs-clock.h"
- /* helper functions to save and restore register state */
- struct sleep_save {
- void __iomem *reg;
- unsigned long val;
- };
- #define SAVE_ITEM(x) \
- { .reg = (x) }
- /**
- * s3c_pm_do_save() - save a set of registers for restoration on resume.
- * @ptr: Pointer to an array of registers.
- * @count: Size of the ptr array.
- *
- * Run through the list of registers given, saving their contents in the
- * array for later restoration when we wakeup.
- */
- static void s3c_pm_do_save(struct sleep_save *ptr, int count)
- {
- for (; count > 0; count--, ptr++) {
- ptr->val = readl_relaxed(ptr->reg);
- S3C_PMDBG("saved %p value %08lx\n", ptr->reg, ptr->val);
- }
- }
- /**
- * s3c_pm_do_restore() - restore register values from the save list.
- * @ptr: Pointer to an array of registers.
- * @count: Size of the ptr array.
- *
- * Restore the register values saved from s3c_pm_do_save().
- *
- * WARNING: Do not put any debug in here that may effect memory or use
- * peripherals, as things may be changing!
- */
- static void s3c_pm_do_restore_core(const struct sleep_save *ptr, int count)
- {
- for (; count > 0; count--, ptr++)
- writel_relaxed(ptr->val, ptr->reg);
- }
- static struct sleep_save s5pv210_core_save[] = {
- /* Clock ETC */
- SAVE_ITEM(S5P_MDNIE_SEL),
- };
- /*
- * VIC wake-up support (TODO)
- */
- static u32 s5pv210_irqwake_intmask = 0xffffffff;
- static u32 s5pv210_read_eint_wakeup_mask(void)
- {
- return __raw_readl(S5P_EINT_WAKEUP_MASK);
- }
- /*
- * Suspend helpers.
- */
- static int s5pv210_cpu_suspend(unsigned long arg)
- {
- unsigned long tmp;
- /* issue the standby signal into the pm unit. Note, we
- * issue a write-buffer drain just in case */
- tmp = 0;
- asm("b 1f\n\t"
- ".align 5\n\t"
- "1:\n\t"
- "mcr p15, 0, %0, c7, c10, 5\n\t"
- "mcr p15, 0, %0, c7, c10, 4\n\t"
- "wfi" : : "r" (tmp));
- pr_info("Failed to suspend the system\n");
- return 1; /* Aborting suspend */
- }
- static void s5pv210_pm_prepare(void)
- {
- unsigned int tmp;
- /*
- * Set wake-up mask registers
- * S5P_EINT_WAKEUP_MASK is set by pinctrl driver in late suspend.
- */
- __raw_writel(s5pv210_irqwake_intmask, S5P_WAKEUP_MASK);
- /* ensure at least INFORM0 has the resume address */
- __raw_writel(__pa_symbol(s5pv210_cpu_resume), S5P_INFORM0);
- tmp = __raw_readl(S5P_SLEEP_CFG);
- tmp &= ~(S5P_SLEEP_CFG_OSC_EN | S5P_SLEEP_CFG_USBOSC_EN);
- __raw_writel(tmp, S5P_SLEEP_CFG);
- /* WFI for SLEEP mode configuration by SYSCON */
- tmp = __raw_readl(S5P_PWR_CFG);
- tmp &= S5P_CFG_WFI_CLEAN;
- tmp |= S5P_CFG_WFI_SLEEP;
- __raw_writel(tmp, S5P_PWR_CFG);
- /* SYSCON interrupt handling disable */
- tmp = __raw_readl(S5P_OTHERS);
- tmp |= S5P_OTHER_SYSC_INTOFF;
- __raw_writel(tmp, S5P_OTHERS);
- s3c_pm_do_save(s5pv210_core_save, ARRAY_SIZE(s5pv210_core_save));
- }
- /*
- * Suspend operations.
- */
- static int s5pv210_suspend_enter(suspend_state_t state)
- {
- u32 eint_wakeup_mask = s5pv210_read_eint_wakeup_mask();
- int ret;
- S3C_PMDBG("%s: suspending the system...\n", __func__);
- S3C_PMDBG("%s: wakeup masks: %08x,%08x\n", __func__,
- s5pv210_irqwake_intmask, eint_wakeup_mask);
- if (s5pv210_irqwake_intmask == -1U
- && eint_wakeup_mask == -1U) {
- pr_err("%s: No wake-up sources!\n", __func__);
- pr_err("%s: Aborting sleep\n", __func__);
- return -EINVAL;
- }
- s3c_pm_save_uarts(false);
- s5pv210_pm_prepare();
- flush_cache_all();
- s3c_pm_check_store();
- ret = cpu_suspend(0, s5pv210_cpu_suspend);
- if (ret)
- return ret;
- s3c_pm_restore_uarts(false);
- S3C_PMDBG("%s: wakeup stat: %08x\n", __func__,
- __raw_readl(S5P_WAKEUP_STAT));
- s3c_pm_check_restore();
- S3C_PMDBG("%s: resuming the system...\n", __func__);
- return 0;
- }
- static int s5pv210_suspend_prepare(void)
- {
- s3c_pm_check_prepare();
- return 0;
- }
- static void s5pv210_suspend_finish(void)
- {
- s3c_pm_check_cleanup();
- }
- static const struct platform_suspend_ops s5pv210_suspend_ops = {
- .enter = s5pv210_suspend_enter,
- .prepare = s5pv210_suspend_prepare,
- .finish = s5pv210_suspend_finish,
- .valid = suspend_valid_only_mem,
- };
- /*
- * Syscore operations used to delay restore of certain registers.
- */
- static void s5pv210_pm_resume(void)
- {
- s3c_pm_do_restore_core(s5pv210_core_save, ARRAY_SIZE(s5pv210_core_save));
- }
- static struct syscore_ops s5pv210_pm_syscore_ops = {
- .resume = s5pv210_pm_resume,
- };
- /*
- * Initialization entry point.
- */
- void __init s5pv210_pm_init(void)
- {
- register_syscore_ops(&s5pv210_pm_syscore_ops);
- suspend_set_ops(&s5pv210_suspend_ops);
- }
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