197 lines
4.1 KiB
C
197 lines
4.1 KiB
C
// SPDX-License-Identifier: GPL-2.0
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//
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// Copyright 2008 Openmoko, Inc.
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// Copyright 2004-2008 Simtec Electronics
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// Ben Dooks <ben@simtec.co.uk>
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// http://armlinux.simtec.co.uk/
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//
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// S3C common power management (suspend to ram) support.
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#include <linux/init.h>
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#include <linux/suspend.h>
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#include <linux/errno.h>
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#include <linux/delay.h>
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#include <linux/of.h>
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#include <linux/serial_s3c.h>
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#include <linux/io.h>
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#include <asm/cacheflush.h>
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#include <asm/suspend.h>
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#include "map.h"
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#include "regs-clock.h"
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#include "regs-irq.h"
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#include "irqs.h"
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#include <asm/irq.h>
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#include "cpu.h"
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#include "pm.h"
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#include "pm-core.h"
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/* for external use */
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unsigned long s3c_pm_flags;
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/* The IRQ ext-int code goes here, it is too small to currently bother
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* with its own file. */
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unsigned long s3c_irqwake_intmask = 0xffffffffL;
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unsigned long s3c_irqwake_eintmask = 0xffffffffL;
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int s3c_irqext_wake(struct irq_data *data, unsigned int state)
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{
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unsigned long bit = 1L << IRQ_EINT_BIT(data->irq);
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if (!(s3c_irqwake_eintallow & bit))
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return -ENOENT;
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printk(KERN_INFO "wake %s for irq %d\n",
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state ? "enabled" : "disabled", data->irq);
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if (!state)
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s3c_irqwake_eintmask |= bit;
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else
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s3c_irqwake_eintmask &= ~bit;
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return 0;
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}
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void (*pm_cpu_prep)(void);
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int (*pm_cpu_sleep)(unsigned long);
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#define any_allowed(mask, allow) (((mask) & (allow)) != (allow))
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/* s3c_pm_enter
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*
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* central control for sleep/resume process
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*/
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static int s3c_pm_enter(suspend_state_t state)
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{
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int ret;
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/* ensure the debug is initialised (if enabled) */
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s3c_pm_debug_init_uart();
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S3C_PMDBG("%s(%d)\n", __func__, state);
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if (pm_cpu_prep == NULL || pm_cpu_sleep == NULL) {
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printk(KERN_ERR "%s: error: no cpu sleep function\n", __func__);
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return -EINVAL;
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}
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/* check if we have anything to wake-up with... bad things seem
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* to happen if you suspend with no wakeup (system will often
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* require a full power-cycle)
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*/
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if (!of_have_populated_dt() &&
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!any_allowed(s3c_irqwake_intmask, s3c_irqwake_intallow) &&
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!any_allowed(s3c_irqwake_eintmask, s3c_irqwake_eintallow)) {
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printk(KERN_ERR "%s: No wake-up sources!\n", __func__);
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printk(KERN_ERR "%s: Aborting sleep\n", __func__);
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return -EINVAL;
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}
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/* save all necessary core registers not covered by the drivers */
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if (!of_have_populated_dt()) {
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samsung_pm_save_gpios();
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samsung_pm_saved_gpios();
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}
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s3c_pm_save_uarts(false);
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s3c_pm_save_core();
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/* set the irq configuration for wake */
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s3c_pm_configure_extint();
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S3C_PMDBG("sleep: irq wakeup masks: %08lx,%08lx\n",
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s3c_irqwake_intmask, s3c_irqwake_eintmask);
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s3c_pm_arch_prepare_irqs();
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/* call cpu specific preparation */
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pm_cpu_prep();
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/* flush cache back to ram */
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flush_cache_all();
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s3c_pm_check_store();
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/* send the cpu to sleep... */
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s3c_pm_arch_stop_clocks();
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/* this will also act as our return point from when
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* we resume as it saves its own register state and restores it
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* during the resume. */
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ret = cpu_suspend(0, pm_cpu_sleep);
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if (ret)
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return ret;
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/* restore the system state */
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s3c_pm_restore_core();
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s3c_pm_restore_uarts(false);
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if (!of_have_populated_dt()) {
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samsung_pm_restore_gpios();
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s3c_pm_restored_gpios();
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}
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s3c_pm_debug_init_uart();
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/* check what irq (if any) restored the system */
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s3c_pm_arch_show_resume_irqs();
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S3C_PMDBG("%s: post sleep, preparing to return\n", __func__);
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s3c_pm_check_restore();
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/* ok, let's return from sleep */
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S3C_PMDBG("S3C PM Resume (post-restore)\n");
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return 0;
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}
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static int s3c_pm_prepare(void)
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{
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/* prepare check area if configured */
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s3c_pm_check_prepare();
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return 0;
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}
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static void s3c_pm_finish(void)
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{
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s3c_pm_check_cleanup();
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}
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static const struct platform_suspend_ops s3c_pm_ops = {
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.enter = s3c_pm_enter,
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.prepare = s3c_pm_prepare,
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.finish = s3c_pm_finish,
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.valid = suspend_valid_only_mem,
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};
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/* s3c_pm_init
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*
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* Attach the power management functions. This should be called
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* from the board specific initialisation if the board supports
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* it.
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*/
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int __init s3c_pm_init(void)
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{
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printk("S3C Power Management, Copyright 2004 Simtec Electronics\n");
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suspend_set_ops(&s3c_pm_ops);
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return 0;
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}
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