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// SPDX-License-Identifier: GPL-2.0+
/*
* Loongson-2 PM Support
*
* Copyright (C) 2023 Loongson Technology Corporation Limited
*/
#include <linux/io.h>
#include <linux/of.h>
#include <linux/init.h>
#include <linux/input.h>
#include <linux/suspend.h>
#include <linux/interrupt.h>
#include <linux/of_platform.h>
#include <linux/pm_wakeirq.h>
#include <linux/platform_device.h>
#include <asm/bootinfo.h>
#include <asm/suspend.h>
#define LOONGSON2_PM1_CNT_REG 0x14
#define LOONGSON2_PM1_STS_REG 0x0c
#define LOONGSON2_PM1_ENA_REG 0x10
#define LOONGSON2_GPE0_STS_REG 0x28
#define LOONGSON2_GPE0_ENA_REG 0x2c
#define LOONGSON2_PM1_PWRBTN_STS BIT(8)
#define LOONGSON2_PM1_PCIEXP_WAKE_STS BIT(14)
#define LOONGSON2_PM1_WAKE_STS BIT(15)
#define LOONGSON2_PM1_CNT_INT_EN BIT(0)
#define LOONGSON2_PM1_PWRBTN_EN LOONGSON2_PM1_PWRBTN_STS
static struct loongson2_pm {
void __iomem *base;
struct input_dev *dev;
bool suspended;
} loongson2_pm;
#define loongson2_pm_readw(reg) readw(loongson2_pm.base + reg)
#define loongson2_pm_readl(reg) readl(loongson2_pm.base + reg)
#define loongson2_pm_writew(val, reg) writew(val, loongson2_pm.base + reg)
#define loongson2_pm_writel(val, reg) writel(val, loongson2_pm.base + reg)
static void loongson2_pm_status_clear(void)
{
u16 value;
value = loongson2_pm_readw(LOONGSON2_PM1_STS_REG);
value |= (LOONGSON2_PM1_PWRBTN_STS | LOONGSON2_PM1_PCIEXP_WAKE_STS |
LOONGSON2_PM1_WAKE_STS);
loongson2_pm_writew(value, LOONGSON2_PM1_STS_REG);
loongson2_pm_writel(loongson2_pm_readl(LOONGSON2_GPE0_STS_REG), LOONGSON2_GPE0_STS_REG);
}
static void loongson2_pm_irq_enable(void)
{
u16 value;
value = loongson2_pm_readw(LOONGSON2_PM1_CNT_REG);
value |= LOONGSON2_PM1_CNT_INT_EN;
loongson2_pm_writew(value, LOONGSON2_PM1_CNT_REG);
value = loongson2_pm_readw(LOONGSON2_PM1_ENA_REG);
value |= LOONGSON2_PM1_PWRBTN_EN;
loongson2_pm_writew(value, LOONGSON2_PM1_ENA_REG);
}
static int loongson2_suspend_enter(suspend_state_t state)
{
loongson2_pm_status_clear();
loongarch_common_suspend();
loongarch_suspend_enter();
loongarch_common_resume();
loongson2_pm_irq_enable();
pm_set_resume_via_firmware();
return 0;
}
static int loongson2_suspend_begin(suspend_state_t state)
{
pm_set_suspend_via_firmware();
return 0;
}
static int loongson2_suspend_valid_state(suspend_state_t state)
{
return (state == PM_SUSPEND_MEM);
}
static const struct platform_suspend_ops loongson2_suspend_ops = {
.valid = loongson2_suspend_valid_state,
.begin = loongson2_suspend_begin,
.enter = loongson2_suspend_enter,
};
static int loongson2_power_button_init(struct device *dev, int irq)
{
int ret;
struct input_dev *button;
button = input_allocate_device();
if (!dev)
return -ENOMEM;
button->name = "Power Button";
button->phys = "pm/button/input0";
button->id.bustype = BUS_HOST;
button->dev.parent = NULL;
input_set_capability(button, EV_KEY, KEY_POWER);
ret = input_register_device(button);
if (ret)
goto free_dev;
dev_pm_set_wake_irq(&button->dev, irq);
device_set_wakeup_capable(&button->dev, true);
device_set_wakeup_enable(&button->dev, true);
loongson2_pm.dev = button;
dev_info(dev, "Power Button: Init successful!\n");
return 0;
free_dev:
input_free_device(button);
return ret;
}
static irqreturn_t loongson2_pm_irq_handler(int irq, void *dev_id)
{
u16 status = loongson2_pm_readw(LOONGSON2_PM1_STS_REG);
if (!loongson2_pm.suspended && (status & LOONGSON2_PM1_PWRBTN_STS)) {
pr_info("Power Button pressed...\n");
input_report_key(loongson2_pm.dev, KEY_POWER, 1);
input_sync(loongson2_pm.dev);
input_report_key(loongson2_pm.dev, KEY_POWER, 0);
input_sync(loongson2_pm.dev);
}
loongson2_pm_status_clear();
return IRQ_HANDLED;
}
static int __maybe_unused loongson2_pm_suspend(struct device *dev)
{
loongson2_pm.suspended = true;
return 0;
}
static int __maybe_unused loongson2_pm_resume(struct device *dev)
{
loongson2_pm.suspended = false;
return 0;
}
static SIMPLE_DEV_PM_OPS(loongson2_pm_ops, loongson2_pm_suspend, loongson2_pm_resume);
static int loongson2_pm_probe(struct platform_device *pdev)
{
int irq, retval;
u64 suspend_addr;
struct device *dev = &pdev->dev;
loongson2_pm.base = devm_platform_ioremap_resource(pdev, 0);
if (IS_ERR(loongson2_pm.base))
return PTR_ERR(loongson2_pm.base);
irq = platform_get_irq(pdev, 0);
if (irq < 0)
return irq;
if (!device_property_read_u64(dev, "loongson,suspend-address", &suspend_addr))
loongson_sysconf.suspend_addr = (u64)phys_to_virt(suspend_addr);
else
dev_err(dev, "No loongson,suspend-address, could not support S3!\n");
if (loongson2_power_button_init(dev, irq))
return -EINVAL;
retval = devm_request_irq(&pdev->dev, irq, loongson2_pm_irq_handler,
IRQF_SHARED, "pm_irq", &loongson2_pm);
if (retval)
return retval;
loongson2_pm_irq_enable();
loongson2_pm_status_clear();
if (loongson_sysconf.suspend_addr)
suspend_set_ops(&loongson2_suspend_ops);
/* Populate children */
retval = devm_of_platform_populate(dev);
if (retval)
dev_err(dev, "Error populating children, reboot and poweroff might not work properly\n");
return 0;
}
static const struct of_device_id loongson2_pm_match[] = {
{ .compatible = "loongson,ls2k0500-pmc", },
{},
};
static struct platform_driver loongson2_pm_driver = {
.driver = {
.name = "ls2k-pm",
.pm = &loongson2_pm_ops,
.of_match_table = loongson2_pm_match,
},
.probe = loongson2_pm_probe,
};
module_platform_driver(loongson2_pm_driver);
MODULE_DESCRIPTION("Loongson-2 PM driver");
MODULE_LICENSE("GPL");
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