1 files changed, 237 insertions, 58 deletions

diff --git a/drivers/gpio/gpio-mxc.c b/drivers/gpio/gpio-mxc.c
index c871602fc5ba..d7666fe9dbf8 100644
--- a/drivers/gpio/gpio-mxc.c
+++ b/drivers/gpio/gpio-mxc.c
@@ -7,6 +7,7 @@
 // Authors: Daniel Mack, Juergen Beisert.
 // Copyright (C) 2004-2010 Freescale Semiconductor, Inc. All Rights Reserved.
 
+#include <linux/cleanup.h>
 #include <linux/clk.h>
 #include <linux/err.h>
 #include <linux/init.h>
@@ -17,13 +18,21 @@
 #include <linux/irqchip/chained_irq.h>
 #include <linux/module.h>
 #include <linux/platform_device.h>
+#include <linux/pm_runtime.h>
 #include <linux/slab.h>
+#include <linux/spinlock.h>
 #include <linux/syscore_ops.h>
 #include <linux/gpio/driver.h>
+#include <linux/gpio/generic.h>
 #include <linux/of.h>
-#include <linux/of_device.h>
 #include <linux/bug.h>
 
+#define IMX_SCU_WAKEUP_OFF		0
+#define IMX_SCU_WAKEUP_LOW_LVL		4
+#define IMX_SCU_WAKEUP_FALL_EDGE	5
+#define IMX_SCU_WAKEUP_RISE_EDGE	6
+#define IMX_SCU_WAKEUP_HIGH_LVL		7
+
 /* device type dependent stuff */
 struct mxc_gpio_hwdata {
 	unsigned dr_reg;
@@ -55,12 +64,16 @@ struct mxc_gpio_port {
 	struct clk *clk;
 	int irq;
 	int irq_high;
+	void (*mx_irq_handler)(struct irq_desc *desc);
 	struct irq_domain *domain;
-	struct gpio_chip gc;
+	struct gpio_generic_chip gen_gc;
 	struct device *dev;
 	u32 both_edges;
 	struct mxc_gpio_reg_saved gpio_saved_reg;
 	bool power_off;
+	u32 wakeup_pads;
+	bool is_pad_wakeup;
+	u32 pad_type[32];
 	const struct mxc_gpio_hwdata *hwdata;
 };
 
@@ -130,6 +143,9 @@ static const struct of_device_id mxc_gpio_dt_ids[] = {
 	{ .compatible = "fsl,imx31-gpio", .data = &imx31_gpio_hwdata },
 	{ .compatible = "fsl,imx35-gpio", .data = &imx35_gpio_hwdata },
 	{ .compatible = "fsl,imx7d-gpio", .data = &imx35_gpio_hwdata },
+	{ .compatible = "fsl,imx8dxl-gpio", .data = &imx35_gpio_hwdata },
+	{ .compatible = "fsl,imx8qm-gpio", .data = &imx35_gpio_hwdata },
+	{ .compatible = "fsl,imx8qxp-gpio", .data = &imx35_gpio_hwdata },
 	{ /* sentinel */ }
 };
 MODULE_DEVICE_TABLE(of, mxc_gpio_dt_ids);
@@ -164,7 +180,7 @@ static int gpio_set_irq_type(struct irq_data *d, u32 type)
 		if (GPIO_EDGE_SEL >= 0) {
 			edge = GPIO_INT_BOTH_EDGES;
 		} else {
-			val = port->gc.get(&port->gc, gpio_idx);
+			val = port->gen_gc.gc.get(&port->gen_gc.gc, gpio_idx);
 			if (val) {
 				edge = GPIO_INT_LOW_LEV;
 				pr_debug("mxc: set GPIO %d to low trigger\n", gpio_idx);
@@ -185,26 +201,29 @@ static int gpio_set_irq_type(struct irq_data *d, u32 type)
 		return -EINVAL;
 	}
 
-	if (GPIO_EDGE_SEL >= 0) {
-		val = readl(port->base + GPIO_EDGE_SEL);
-		if (edge == GPIO_INT_BOTH_EDGES)
-			writel(val | (1 << gpio_idx),
-				port->base + GPIO_EDGE_SEL);
-		else
-			writel(val & ~(1 << gpio_idx),
-				port->base + GPIO_EDGE_SEL);
-	}
+	scoped_guard(gpio_generic_lock_irqsave, &port->gen_gc) {
+		if (GPIO_EDGE_SEL >= 0) {
+			val = readl(port->base + GPIO_EDGE_SEL);
+			if (edge == GPIO_INT_BOTH_EDGES)
+				writel(val | (1 << gpio_idx),
+				       port->base + GPIO_EDGE_SEL);
+			else
+				writel(val & ~(1 << gpio_idx),
+				       port->base + GPIO_EDGE_SEL);
+		}
 
-	if (edge != GPIO_INT_BOTH_EDGES) {
-		reg += GPIO_ICR1 + ((gpio_idx & 0x10) >> 2); /* lower or upper register */
-		bit = gpio_idx & 0xf;
-		val = readl(reg) & ~(0x3 << (bit << 1));
-		writel(val | (edge << (bit << 1)), reg);
-	}
+		if (edge != GPIO_INT_BOTH_EDGES) {
+			reg += GPIO_ICR1 + ((gpio_idx & 0x10) >> 2); /* lower or upper register */
+			bit = gpio_idx & 0xf;
+			val = readl(reg) & ~(0x3 << (bit << 1));
+			writel(val | (edge << (bit << 1)), reg);
+		}
 
-	writel(1 << gpio_idx, port->base + GPIO_ISR);
+		writel(1 << gpio_idx, port->base + GPIO_ISR);
+		port->pad_type[gpio_idx] = type;
+	}
 
-	return 0;
+	return port->gen_gc.gc.direction_input(&port->gen_gc.gc, gpio_idx);
 }
 
 static void mxc_flip_edge(struct mxc_gpio_port *port, u32 gpio)
@@ -213,6 +232,8 @@ static void mxc_flip_edge(struct mxc_gpio_port *port, u32 gpio)
 	u32 bit, val;
 	int edge;
 
+	guard(gpio_generic_lock_irqsave)(&port->gen_gc);
+
 	reg += GPIO_ICR1 + ((gpio & 0x10) >> 2); /* lower or upper register */
 	bit = gpio & 0xf;
 	val = readl(reg);
@@ -254,6 +275,9 @@ static void mx3_gpio_irq_handler(struct irq_desc *desc)
 	struct mxc_gpio_port *port = irq_desc_get_handler_data(desc);
 	struct irq_chip *chip = irq_desc_get_chip(desc);
 
+	if (port->is_pad_wakeup)
+		return;
+
 	chained_irq_enter(chip, desc);
 
 	irq_stat = readl(port->base + GPIO_ISR) & readl(port->base + GPIO_IMR);
@@ -306,11 +330,13 @@ static int gpio_set_wake_irq(struct irq_data *d, u32 enable)
 			ret = enable_irq_wake(port->irq_high);
 		else
 			ret = enable_irq_wake(port->irq);
+		port->wakeup_pads |= (1 << gpio_idx);
 	} else {
 		if (port->irq_high && (gpio_idx >= 16))
 			ret = disable_irq_wake(port->irq_high);
 		else
 			ret = disable_irq_wake(port->irq);
+		port->wakeup_pads &= ~(1 << gpio_idx);
 	}
 
 	return ret;
@@ -352,8 +378,44 @@ static int mxc_gpio_to_irq(struct gpio_chip *gc, unsigned offset)
 	return irq_find_mapping(port->domain, offset);
 }
 
+static int mxc_gpio_request(struct gpio_chip *chip, unsigned int offset)
+{
+	int ret;
+
+	ret = gpiochip_generic_request(chip, offset);
+	if (ret)
+		return ret;
+
+	return pm_runtime_resume_and_get(chip->parent);
+}
+
+static void mxc_gpio_free(struct gpio_chip *chip, unsigned int offset)
+{
+	gpiochip_generic_free(chip, offset);
+	pm_runtime_put(chip->parent);
+}
+
+static void mxc_update_irq_chained_handler(struct mxc_gpio_port *port, bool enable)
+{
+	if (enable)
+		irq_set_chained_handler_and_data(port->irq, port->mx_irq_handler, port);
+	else
+		irq_set_chained_handler_and_data(port->irq, NULL, NULL);
+
+	/* setup handler for GPIO 16 to 31 */
+	if (port->irq_high > 0) {
+		if (enable)
+			irq_set_chained_handler_and_data(port->irq_high,
+							 port->mx_irq_handler,
+							 port);
+		else
+			irq_set_chained_handler_and_data(port->irq_high, NULL, NULL);
+	}
+}
+
 static int mxc_gpio_probe(struct platform_device *pdev)
 {
+	struct gpio_generic_chip_config config = { };
 	struct device_node *np = pdev->dev.of_node;
 	struct mxc_gpio_port *port;
 	int irq_count;
@@ -365,7 +427,6 @@ static int mxc_gpio_probe(struct platform_device *pdev)
 		return -ENOMEM;
 
 	port->dev = &pdev->dev;
-
 	port->hwdata = device_get_match_data(&pdev->dev);
 
 	port->base = devm_platform_ioremap_resource(pdev, 0);
@@ -387,19 +448,17 @@ static int mxc_gpio_probe(struct platform_device *pdev)
 		return port->irq;
 
 	/* the controller clock is optional */
-	port->clk = devm_clk_get_optional(&pdev->dev, NULL);
+	port->clk = devm_clk_get_optional_enabled(&pdev->dev, NULL);
 	if (IS_ERR(port->clk))
 		return PTR_ERR(port->clk);
 
-	err = clk_prepare_enable(port->clk);
-	if (err) {
-		dev_err(&pdev->dev, "Unable to enable clock.\n");
-		return err;
-	}
-
 	if (of_device_is_compatible(np, "fsl,imx7d-gpio"))
 		port->power_off = true;
 
+	pm_runtime_get_noresume(&pdev->dev);
+	pm_runtime_set_active(&pdev->dev);
+	pm_runtime_enable(&pdev->dev);
+
 	/* disable the interrupt and clear the status */
 	writel(0, port->base + GPIO_IMR);
 	writel(~0, port->base + GPIO_ISR);
@@ -410,33 +469,37 @@ static int mxc_gpio_probe(struct platform_device *pdev)
 		 * the handler is needed only once, but doing it for every port
 		 * is more robust and easier.
 		 */
-		irq_set_chained_handler(port->irq, mx2_gpio_irq_handler);
-	} else {
-		/* setup one handler for each entry */
-		irq_set_chained_handler_and_data(port->irq,
-						 mx3_gpio_irq_handler, port);
-		if (port->irq_high > 0)
-			/* setup handler for GPIO 16 to 31 */
-			irq_set_chained_handler_and_data(port->irq_high,
-							 mx3_gpio_irq_handler,
-							 port);
-	}
+		port->irq_high = -1;
+		port->mx_irq_handler = mx2_gpio_irq_handler;
+	} else
+		port->mx_irq_handler = mx3_gpio_irq_handler;
 
-	err = bgpio_init(&port->gc, &pdev->dev, 4,
-			 port->base + GPIO_PSR,
-			 port->base + GPIO_DR, NULL,
-			 port->base + GPIO_GDIR, NULL,
-			 BGPIOF_READ_OUTPUT_REG_SET);
+	mxc_update_irq_chained_handler(port, true);
+
+	config.dev = &pdev->dev;
+	config.sz = 4;
+	config.dat = port->base + GPIO_PSR;
+	config.set = port->base + GPIO_DR;
+	config.dirout = port->base + GPIO_GDIR;
+	config.flags = GPIO_GENERIC_READ_OUTPUT_REG_SET;
+
+	err = gpio_generic_chip_init(&port->gen_gc, &config);
 	if (err)
 		goto out_bgio;
 
-	port->gc.request = gpiochip_generic_request;
-	port->gc.free = gpiochip_generic_free;
-	port->gc.to_irq = mxc_gpio_to_irq;
-	port->gc.base = (pdev->id < 0) ? of_alias_get_id(np, "gpio") * 32 :
-					     pdev->id * 32;
-
-	err = devm_gpiochip_add_data(&pdev->dev, &port->gc, port);
+	port->gen_gc.gc.request = mxc_gpio_request;
+	port->gen_gc.gc.free = mxc_gpio_free;
+	port->gen_gc.gc.to_irq = mxc_gpio_to_irq;
+	/*
+	 * Driver is DT-only, so a fixed base needs only be maintained for legacy
+	 * userspace with sysfs interface.
+	 */
+	if (IS_ENABLED(CONFIG_GPIO_SYSFS))
+		port->gen_gc.gc.base = of_alias_get_id(np, "gpio") * 32;
+	else /* silence boot time warning */
+		port->gen_gc.gc.base = -1;
+
+	err = devm_gpiochip_add_data(&pdev->dev, &port->gen_gc.gc, port);
 	if (err)
 		goto out_bgio;
 
@@ -446,13 +509,15 @@ static int mxc_gpio_probe(struct platform_device *pdev)
 		goto out_bgio;
 	}
 
-	port->domain = irq_domain_add_legacy(np, 32, irq_base, 0,
-					     &irq_domain_simple_ops, NULL);
+	port->domain = irq_domain_create_legacy(dev_fwnode(&pdev->dev), 32, irq_base, 0,
+						&irq_domain_simple_ops, NULL);
 	if (!port->domain) {
 		err = -ENODEV;
 		goto out_bgio;
 	}
 
+	irq_domain_set_pm_device(port->domain, &pdev->dev);
+
 	/* gpio-mxc can be a generic irq chip */
 	err = mxc_gpio_init_gc(port, irq_base);
 	if (err < 0)
@@ -461,13 +526,15 @@ static int mxc_gpio_probe(struct platform_device *pdev)
 	list_add_tail(&port->node, &mxc_gpio_ports);
 
 	platform_set_drvdata(pdev, port);
+	pm_runtime_put_autosuspend(&pdev->dev);
 
 	return 0;
 
 out_irqdomain_remove:
 	irq_domain_remove(port->domain);
 out_bgio:
-	clk_disable_unprepare(port->clk);
+	pm_runtime_disable(&pdev->dev);
+	pm_runtime_put_noidle(&pdev->dev);
 	dev_info(&pdev->dev, "%s failed with errno %d\n", __func__, err);
 	return err;
 }
@@ -498,12 +565,118 @@ static void mxc_gpio_restore_regs(struct mxc_gpio_port *port)
 	writel(port->gpio_saved_reg.dr, port->base + GPIO_DR);
 }
 
-static int mxc_gpio_syscore_suspend(void)
+static bool mxc_gpio_generic_config(struct mxc_gpio_port *port,
+		unsigned int offset, unsigned long conf)
+{
+	struct device_node *np = port->dev->of_node;
+
+	if (of_device_is_compatible(np, "fsl,imx8dxl-gpio") ||
+	    of_device_is_compatible(np, "fsl,imx8qxp-gpio") ||
+	    of_device_is_compatible(np, "fsl,imx8qm-gpio"))
+		return (gpiochip_generic_config(&port->gen_gc.gc,
+						offset, conf) == 0);
+
+	return false;
+}
+
+static bool mxc_gpio_set_pad_wakeup(struct mxc_gpio_port *port, bool enable)
+{
+	unsigned long config;
+	bool ret = false;
+	int i, type;
+
+	static const u32 pad_type_map[] = {
+		IMX_SCU_WAKEUP_OFF,		/* 0 */
+		IMX_SCU_WAKEUP_RISE_EDGE,	/* IRQ_TYPE_EDGE_RISING */
+		IMX_SCU_WAKEUP_FALL_EDGE,	/* IRQ_TYPE_EDGE_FALLING */
+		IMX_SCU_WAKEUP_FALL_EDGE,	/* IRQ_TYPE_EDGE_BOTH */
+		IMX_SCU_WAKEUP_HIGH_LVL,	/* IRQ_TYPE_LEVEL_HIGH */
+		IMX_SCU_WAKEUP_OFF,		/* 5 */
+		IMX_SCU_WAKEUP_OFF,		/* 6 */
+		IMX_SCU_WAKEUP_OFF,		/* 7 */
+		IMX_SCU_WAKEUP_LOW_LVL,		/* IRQ_TYPE_LEVEL_LOW */
+	};
+
+	for (i = 0; i < 32; i++) {
+		if ((port->wakeup_pads & (1 << i))) {
+			type = port->pad_type[i];
+			if (enable)
+				config = pad_type_map[type];
+			else
+				config = IMX_SCU_WAKEUP_OFF;
+			ret |= mxc_gpio_generic_config(port, i, config);
+		}
+	}
+
+	return ret;
+}
+
+static int mxc_gpio_runtime_suspend(struct device *dev)
+{
+	struct mxc_gpio_port *port = dev_get_drvdata(dev);
+
+	mxc_gpio_save_regs(port);
+	clk_disable_unprepare(port->clk);
+	mxc_update_irq_chained_handler(port, false);
+
+	return 0;
+}
+
+static int mxc_gpio_runtime_resume(struct device *dev)
+{
+	struct mxc_gpio_port *port = dev_get_drvdata(dev);
+	int ret;
+
+	mxc_update_irq_chained_handler(port, true);
+	ret = clk_prepare_enable(port->clk);
+	if (ret) {
+		mxc_update_irq_chained_handler(port, false);
+		return ret;
+	}
+
+	mxc_gpio_restore_regs(port);
+
+	return 0;
+}
+
+static int mxc_gpio_noirq_suspend(struct device *dev)
+{
+	struct platform_device *pdev = to_platform_device(dev);
+	struct mxc_gpio_port *port = platform_get_drvdata(pdev);
+
+	if (port->wakeup_pads > 0)
+		port->is_pad_wakeup = mxc_gpio_set_pad_wakeup(port, true);
+
+	return 0;
+}
+
+static int mxc_gpio_noirq_resume(struct device *dev)
+{
+	struct platform_device *pdev = to_platform_device(dev);
+	struct mxc_gpio_port *port = platform_get_drvdata(pdev);
+
+	if (port->wakeup_pads > 0)
+		mxc_gpio_set_pad_wakeup(port, false);
+	port->is_pad_wakeup = false;
+
+	return 0;
+}
+
+static const struct dev_pm_ops mxc_gpio_dev_pm_ops = {
+	NOIRQ_SYSTEM_SLEEP_PM_OPS(mxc_gpio_noirq_suspend, mxc_gpio_noirq_resume)
+	RUNTIME_PM_OPS(mxc_gpio_runtime_suspend, mxc_gpio_runtime_resume, NULL)
+};
+
+static int mxc_gpio_syscore_suspend(void *data)
 {
 	struct mxc_gpio_port *port;
+	int ret;
 
 	/* walk through all ports */
 	list_for_each_entry(port, &mxc_gpio_ports, node) {
+		ret = clk_prepare_enable(port->clk);
+		if (ret)
+			return ret;
 		mxc_gpio_save_regs(port);
 		clk_disable_unprepare(port->clk);
 	}
@@ -511,7 +684,7 @@ static int mxc_gpio_syscore_suspend(void)
 	return 0;
 }
 
-static void mxc_gpio_syscore_resume(void)
+static void mxc_gpio_syscore_resume(void *data)
 {
 	struct mxc_gpio_port *port;
 	int ret;
@@ -524,26 +697,32 @@ static void mxc_gpio_syscore_resume(void)
 			return;
 		}
 		mxc_gpio_restore_regs(port);
+		clk_disable_unprepare(port->clk);
 	}
 }
 
-static struct syscore_ops mxc_gpio_syscore_ops = {
+static const struct syscore_ops mxc_gpio_syscore_ops = {
 	.suspend = mxc_gpio_syscore_suspend,
 	.resume = mxc_gpio_syscore_resume,
 };
 
+static struct syscore mxc_gpio_syscore = {
+	.ops = &mxc_gpio_syscore_ops,
+};
+
 static struct platform_driver mxc_gpio_driver = {
 	.driver		= {
 		.name	= "gpio-mxc",
 		.of_match_table = mxc_gpio_dt_ids,
 		.suppress_bind_attrs = true,
+		.pm = pm_ptr(&mxc_gpio_dev_pm_ops),
 	},
 	.probe		= mxc_gpio_probe,
 };
 
 static int __init gpio_mxc_init(void)
 {
-	register_syscore_ops(&mxc_gpio_syscore_ops);
+	register_syscore(&mxc_gpio_syscore);
 
 	return platform_driver_register(&mxc_gpio_driver);
 }