Resguardo inicial

linux-7.2.3/drivers/soc/loongson/Kconfig

@@ -0,0 +1,29 @@
+# SPDX-License-Identifier: GPL-2.0+
+#
+# Loongson-2 series SoC drivers
+#
+
+config LOONGSON2_GUTS
+	tristate "Loongson-2 SoC Global UtiliTieS (GUTS) register block"
+	depends on LOONGARCH || COMPILE_TEST
+	select SOC_BUS
+	help
+	 The global utilities block controls PCIE device enabling, alternate
+	 function selection for multiplexed signals, consistency of HDA, USB
+	 and PCIE, configuration of memory controller, rtc controller, lio
+	 controller, and clock control. This patch adds a driver to manage
+	 and access global utilities block for LoongArch architecture Loongson-2
+	 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
+	depends on INPUT=y
+	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.

linux-7.2.3/drivers/soc/loongson/Makefile

@@ -0,0 +1,7 @@
+# SPDX-License-Identifier: GPL-2.0+
+#
+# Makefile for the Linux Kernel SoC Loongson-2 specific device drivers
+#
+
+obj-$(CONFIG_LOONGSON2_GUTS)		+= loongson2_guts.o
+obj-$(CONFIG_LOONGSON2_PM)		+= loongson2_pm.o

linux-7.2.3/drivers/soc/loongson/loongson2_guts.c

@@ -0,0 +1,191 @@
+// SPDX-License-Identifier: GPL-2.0+
+/*
+ * Author: Yinbo Zhu <zhuyinbo@loongson.cn>
+ * Copyright (C) 2022-2023 Loongson Technology Corporation Limited
+ */
+
+#include <linux/io.h>
+#include <linux/slab.h>
+#include <linux/module.h>
+#include <linux/of_fdt.h>
+#include <linux/sys_soc.h>
+#include <linux/of_address.h>
+#include <linux/platform_device.h>
+
+static struct soc_device_attribute soc_dev_attr;
+static struct soc_device *soc_dev;
+
+/*
+ * Global Utility Registers.
+ *
+ * Not all registers defined in this structure are available on all chips, so
+ * you are expected to know whether a given register actually exists on your
+ * chip before you access it.
+ *
+ * Also, some registers are similar on different chips but have slightly
+ * different names.  In these cases, one name is chosen to avoid extraneous
+ * #ifdefs.
+ */
+struct scfg_guts {
+	u32     svr;            /* Version Register */
+	u8      res0[4];
+	u16     feature;        /* Feature Register */
+	u32     vendor;         /* Vendor Register */
+	u8      res1[6];
+	u32     id;
+	u8      res2[0x3ff8 - 0x18];
+	u32     chip;
+};
+
+static struct guts {
+	struct scfg_guts __iomem *regs;
+	bool little_endian;
+} *guts;
+
+struct loongson2_soc_die_attr {
+	char	*die;
+	u32	svr;
+	u32	mask;
+};
+
+/* SoC die attribute definition for Loongson-2 platform */
+static const struct loongson2_soc_die_attr loongson2_soc_die[] = {
+
+	/*
+	 * LoongArch-based SoCs Loongson-2 Series
+	 */
+
+	/* Die: 2k1000, SoC: 2k1000 */
+	{ .die		= "2K1000",
+	  .svr		= 0x00000013,
+	  .mask		= 0x000000ff,
+	},
+	{ },
+};
+
+static const struct loongson2_soc_die_attr *loongson2_soc_die_match(
+	u32 svr, const struct loongson2_soc_die_attr *matches)
+{
+	while (matches->svr) {
+		if (matches->svr == (svr & matches->mask))
+			return matches;
+		matches++;
+	}
+
+	return NULL;
+}
+
+static u32 loongson2_guts_get_svr(void)
+{
+	u32 svr = 0;
+
+	if (!guts || !guts->regs)
+		return svr;
+
+	if (guts->little_endian)
+		svr = ioread32(&guts->regs->svr);
+	else
+		svr = ioread32be(&guts->regs->svr);
+
+	return svr;
+}
+
+static int loongson2_guts_probe(struct platform_device *pdev)
+{
+	struct device_node *root, *np = pdev->dev.of_node;
+	struct device *dev = &pdev->dev;
+	const struct loongson2_soc_die_attr *soc_die;
+	const char *machine;
+	u32 svr;
+
+	/* Initialize guts */
+	guts = devm_kzalloc(dev, sizeof(*guts), GFP_KERNEL);
+	if (!guts)
+		return -ENOMEM;
+
+	guts->little_endian = of_property_read_bool(np, "little-endian");
+
+	guts->regs = devm_platform_ioremap_resource(pdev, 0);
+	if (IS_ERR(guts->regs))
+		return PTR_ERR(guts->regs);
+
+	/* Register soc device */
+	root = of_find_node_by_path("/");
+	if (of_property_read_string(root, "model", &machine))
+		of_property_read_string_index(root, "compatible", 0, &machine);
+	of_node_put(root);
+	if (machine) {
+		soc_dev_attr.machine = devm_kstrdup(dev, machine, GFP_KERNEL);
+		if (!soc_dev_attr.machine)
+			return -ENOMEM;
+	}
+
+	svr = loongson2_guts_get_svr();
+	soc_die = loongson2_soc_die_match(svr, loongson2_soc_die);
+	if (soc_die) {
+		soc_dev_attr.family = devm_kasprintf(dev, GFP_KERNEL,
+						     "Loongson %s", soc_die->die);
+	} else {
+		soc_dev_attr.family = devm_kasprintf(dev, GFP_KERNEL, "Loongson");
+	}
+	if (!soc_dev_attr.family)
+		return -ENOMEM;
+	soc_dev_attr.soc_id = devm_kasprintf(dev, GFP_KERNEL,
+					     "svr:0x%08x", svr);
+	if (!soc_dev_attr.soc_id)
+		return -ENOMEM;
+	soc_dev_attr.revision = devm_kasprintf(dev, GFP_KERNEL, "%d.%d",
+					       (svr >>  4) & 0xf, svr & 0xf);
+	if (!soc_dev_attr.revision)
+		return -ENOMEM;
+
+	soc_dev = soc_device_register(&soc_dev_attr);
+	if (IS_ERR(soc_dev))
+		return PTR_ERR(soc_dev);
+
+	pr_info("Machine: %s\n", soc_dev_attr.machine);
+	pr_info("SoC family: %s\n", soc_dev_attr.family);
+	pr_info("SoC ID: %s, Revision: %s\n",
+		soc_dev_attr.soc_id, soc_dev_attr.revision);
+
+	return 0;
+}
+
+static void loongson2_guts_remove(struct platform_device *dev)
+{
+	soc_device_unregister(soc_dev);
+}
+
+/*
+ * Table for matching compatible strings, for device tree
+ * guts node, for Loongson-2 SoCs.
+ */
+static const struct of_device_id loongson2_guts_of_match[] = {
+	{ .compatible = "loongson,ls2k-chipid", },
+	{}
+};
+MODULE_DEVICE_TABLE(of, loongson2_guts_of_match);
+
+static struct platform_driver loongson2_guts_driver = {
+	.driver = {
+		.name = "loongson2-guts",
+		.of_match_table = loongson2_guts_of_match,
+	},
+	.probe = loongson2_guts_probe,
+	.remove = loongson2_guts_remove,
+};
+
+static int __init loongson2_guts_init(void)
+{
+	return platform_driver_register(&loongson2_guts_driver);
+}
+core_initcall(loongson2_guts_init);
+
+static void __exit loongson2_guts_exit(void)
+{
+	platform_driver_unregister(&loongson2_guts_driver);
+}
+module_exit(loongson2_guts_exit);
+
+MODULE_DESCRIPTION("Loongson2 GUTS driver");
+MODULE_LICENSE("GPL");

linux-7.2.3/drivers/soc/loongson/loongson2_pm.c

@@ -0,0 +1,220 @@
+// 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");