[v5,2/2] soc: loongson2_pm: add power management support

Message ID 20230728074944.26746-3-zhuyinbo@loongson.cn
State New
Headers
Series soc: loongson2_pm: add power management support |

Commit Message

Yinbo Zhu July 28, 2023, 7:49 a.m. UTC
  The Loongson-2's power management controller was ACPI, supports ACPI
S2Idle (Suspend To Idle), ACPI S3 (Suspend To RAM), ACPI S4 (Suspend To
Disk), ACPI S5 (Soft Shutdown) and supports multiple wake-up methods
(USB, GMAC, PWRBTN, etc.). This driver was to add power management
controller support that base on dts for Loongson-2 series SoCs.

Co-developed-by: Liu Yun <liuyun@loongson.cn>
Signed-off-by: Liu Yun <liuyun@loongson.cn>
Co-developed-by: Liu Peibao <liupeibao@loongson.cn>
Signed-off-by: Liu Peibao <liupeibao@loongson.cn>
Signed-off-by: Yinbo Zhu <zhuyinbo@loongson.cn>
---
 MAINTAINERS                         |   1 +
 drivers/soc/loongson/Kconfig        |  10 ++
 drivers/soc/loongson/Makefile       |   1 +
 drivers/soc/loongson/loongson2_pm.c | 215 ++++++++++++++++++++++++++++
 4 files changed, 227 insertions(+)
 create mode 100644 drivers/soc/loongson/loongson2_pm.c
  

Comments

Arnd Bergmann July 28, 2023, 10:46 a.m. UTC | #1
On Fri, Jul 28, 2023, at 09:49, Yinbo Zhu wrote:
> The Loongson-2's power management controller was ACPI, supports ACPI
> S2Idle (Suspend To Idle), ACPI S3 (Suspend To RAM), ACPI S4 (Suspend To
> Disk), ACPI S5 (Soft Shutdown) and supports multiple wake-up methods
> (USB, GMAC, PWRBTN, etc.). This driver was to add power management
> controller support that base on dts for Loongson-2 series SoCs.
>
> Co-developed-by: Liu Yun <liuyun@loongson.cn>
> Signed-off-by: Liu Yun <liuyun@loongson.cn>
> Co-developed-by: Liu Peibao <liupeibao@loongson.cn>
> Signed-off-by: Liu Peibao <liupeibao@loongson.cn>
> Signed-off-by: Yinbo Zhu <zhuyinbo@loongson.cn>

Adding Ulf Hansson to Cc

Ulf has recently split out the "genpd" framework and split out
drivers/genpd from drivers/soc since I'm generally not that involved
in the pwoer management side.

Can you have a look at whether this driver should also be part
of drivers/genpd rather than drivers/soc, and/or converted
to use the genpd infrastructure?

Thanks,

       Arnd
  
Randy Dunlap July 28, 2023, 12:17 p.m. UTC | #2
Hi--

On 7/28/23 00:49, Yinbo Zhu wrote:
> +config LOONGSON2_PM
> +	bool "Loongson-2 SoC Power Management Controller Driver"
> +	depends on LOONGARCH && OF
> +	help
> +	 The Loongson-2's power management controller was ACPI, supports ACPI
> +	 S2Idle (Suspend To Idle), ACPI S3 (Suspend To RAM), ACPI S4 (Suspend To
> +	 Disk), ACPI S5 (Soft Shutdown) and supports multiple wake-up methods
> +	 (USB, GMAC, PWRBTN, etc.). This driver was to add power management
> +	 controller support that base on dts for Loongson-2 series SoCs.

Kconfig help text should be indented with one tab +2 spaces, as documented
in Documentation/process/coding-style.rst.

thanks.
  
Yinbo Zhu July 31, 2023, 3:12 a.m. UTC | #3
在 2023/7/28 下午6:46, Arnd Bergmann 写道:
> On Fri, Jul 28, 2023, at 09:49, Yinbo Zhu wrote:
>> The Loongson-2's power management controller was ACPI, supports ACPI
>> S2Idle (Suspend To Idle), ACPI S3 (Suspend To RAM), ACPI S4 (Suspend To
>> Disk), ACPI S5 (Soft Shutdown) and supports multiple wake-up methods
>> (USB, GMAC, PWRBTN, etc.). This driver was to add power management
>> controller support that base on dts for Loongson-2 series SoCs.
>>
>> Co-developed-by: Liu Yun <liuyun@loongson.cn>
>> Signed-off-by: Liu Yun <liuyun@loongson.cn>
>> Co-developed-by: Liu Peibao <liupeibao@loongson.cn>
>> Signed-off-by: Liu Peibao <liupeibao@loongson.cn>
>> Signed-off-by: Yinbo Zhu <zhuyinbo@loongson.cn>
> 
> Adding Ulf Hansson to Cc


okay, I will add ulf hansson to Cc.

> 
> Ulf has recently split out the "genpd" framework and split out
> drivers/genpd from drivers/soc since I'm generally not that involved
> in the pwoer management side.

okay, I got it.

> 
> Can you have a look at whether this driver should also be part
> of drivers/genpd rather than drivers/soc, and/or converted
> to use the genpd infrastructure?


I have a look drivers/soc and drivers/genpd, there seems to be power
manager code in both paths, but drivers/genpd seems more suitable. I
will move the code to drivers/genpd

Thanks,
Yinbo
  
Yinbo Zhu July 31, 2023, 3:14 a.m. UTC | #4
在 2023/7/28 下午8:17, Randy Dunlap 写道:
> Hi--
> 
> On 7/28/23 00:49, Yinbo Zhu wrote:
>> +config LOONGSON2_PM
>> +	bool "Loongson-2 SoC Power Management Controller Driver"
>> +	depends on LOONGARCH && OF
>> +	help
>> +	 The Loongson-2's power management controller was ACPI, supports ACPI
>> +	 S2Idle (Suspend To Idle), ACPI S3 (Suspend To RAM), ACPI S4 (Suspend To
>> +	 Disk), ACPI S5 (Soft Shutdown) and supports multiple wake-up methods
>> +	 (USB, GMAC, PWRBTN, etc.). This driver was to add power management
>> +	 controller support that base on dts for Loongson-2 series SoCs.
> 
> Kconfig help text should be indented with one tab +2 spaces, as documented
> in Documentation/process/coding-style.rst.


okay, I got it.

Thanks,
Yinbo
  

Patch

diff --git a/MAINTAINERS b/MAINTAINERS
index bcd05f1fa5c1..7c4ad0cbaeff 100644
--- a/MAINTAINERS
+++ b/MAINTAINERS
@@ -12195,6 +12195,7 @@  M:	Yinbo Zhu <zhuyinbo@loongson.cn>
 L:	linux-pm@vger.kernel.org
 S:	Maintained
 F:	Documentation/devicetree/bindings/soc/loongson/loongson,ls2k-pmc.yaml
+F:	drivers/soc/loongson/loongson2_pm.c
 
 LOONGSON-2 SOC SERIES PINCTRL DRIVER
 M:	zhanghongchen <zhanghongchen@loongson.cn>
diff --git a/drivers/soc/loongson/Kconfig b/drivers/soc/loongson/Kconfig
index 707f56358dc4..4f3ce9eb7520 100644
--- a/drivers/soc/loongson/Kconfig
+++ b/drivers/soc/loongson/Kconfig
@@ -16,3 +16,13 @@  config LOONGSON2_GUTS
 	 SoCs. Initially only reading SVR and registering soc device are
 	 supported. Other guts accesses, such as reading firmware configuration
 	 by default, should eventually be added into this driver as well.
+
+config LOONGSON2_PM
+	bool "Loongson-2 SoC Power Management Controller Driver"
+	depends on LOONGARCH && OF
+	help
+	 The Loongson-2's power management controller was ACPI, supports ACPI
+	 S2Idle (Suspend To Idle), ACPI S3 (Suspend To RAM), ACPI S4 (Suspend To
+	 Disk), ACPI S5 (Soft Shutdown) and supports multiple wake-up methods
+	 (USB, GMAC, PWRBTN, etc.). This driver was to add power management
+	 controller support that base on dts for Loongson-2 series SoCs.
diff --git a/drivers/soc/loongson/Makefile b/drivers/soc/loongson/Makefile
index 263c486df638..4118f50f55e2 100644
--- a/drivers/soc/loongson/Makefile
+++ b/drivers/soc/loongson/Makefile
@@ -4,3 +4,4 @@ 
 #
 
 obj-$(CONFIG_LOONGSON2_GUTS)		+= loongson2_guts.o
+obj-$(CONFIG_LOONGSON2_PM)		+= loongson2_pm.o
diff --git a/drivers/soc/loongson/loongson2_pm.c b/drivers/soc/loongson/loongson2_pm.c
new file mode 100644
index 000000000000..796add6e8b63
--- /dev/null
+++ b/drivers/soc/loongson/loongson2_pm.c
@@ -0,0 +1,215 @@ 
+// 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/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);
+
+	return 0;
+}
+
+static const struct of_device_id loongson2_pm_match[] = {
+	{ .compatible = "loongson,ls2k0500-pmc", },
+	{ .compatible = "loongson,ls2k1000-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");