1 files changed, 51 insertions, 53 deletions

diff --git a/drivers/gpio/gpio-grgpio.c b/drivers/gpio/gpio-grgpio.c
index 169f33c41c59..e4fa84e22726 100644
--- a/drivers/gpio/gpio-grgpio.c
+++ b/drivers/gpio/gpio-grgpio.c
@@ -19,6 +19,7 @@
 #include <linux/bitops.h>
 #include <linux/err.h>
 #include <linux/gpio/driver.h>
+#include <linux/gpio/generic.h>
 #include <linux/init.h>
 #include <linux/interrupt.h>
 #include <linux/io.h>
@@ -30,6 +31,7 @@
 #include <linux/platform_device.h>
 #include <linux/slab.h>
 #include <linux/spinlock.h>
+#include <linux/string_choices.h>
 
 #define GRGPIO_MAX_NGPIO 32
 
@@ -44,7 +46,7 @@
 
 /* Structure for an irq of the core - called an underlying irq */
 struct grgpio_uirq {
-	u8 refcnt; /* Reference counter to manage requesting/freeing of uirq */
+	atomic_t refcnt; /* Reference counter to manage requesting/freeing of uirq */
 	u8 uirq; /* Underlying irq of the gpio driver */
 };
 
@@ -58,7 +60,7 @@ struct grgpio_lirq {
 };
 
 struct grgpio_priv {
-	struct gpio_chip gc;
+	struct gpio_generic_chip chip;
 	void __iomem *regs;
 	struct device *dev;
 
@@ -90,13 +92,12 @@ struct grgpio_priv {
 static void grgpio_set_imask(struct grgpio_priv *priv, unsigned int offset,
 			     int val)
 {
-	struct gpio_chip *gc = &priv->gc;
-
 	if (val)
 		priv->imask |= BIT(offset);
 	else
 		priv->imask &= ~BIT(offset);
-	gc->write_reg(priv->regs + GRGPIO_IMASK, priv->imask);
+
+	gpio_generic_write_reg(&priv->chip, priv->regs + GRGPIO_IMASK, priv->imask);
 }
 
 static int grgpio_to_irq(struct gpio_chip *gc, unsigned offset)
@@ -117,7 +118,6 @@ static int grgpio_to_irq(struct gpio_chip *gc, unsigned offset)
 static int grgpio_irq_set_type(struct irq_data *d, unsigned int type)
 {
 	struct grgpio_priv *priv = irq_data_get_irq_chip_data(d);
-	unsigned long flags;
 	u32 mask = BIT(d->hwirq);
 	u32 ipol;
 	u32 iedge;
@@ -145,15 +145,13 @@ static int grgpio_irq_set_type(struct irq_data *d, unsigned int type)
 		return -EINVAL;
 	}
 
-	raw_spin_lock_irqsave(&priv->gc.bgpio_lock, flags);
-
-	ipol = priv->gc.read_reg(priv->regs + GRGPIO_IPOL) & ~mask;
-	iedge = priv->gc.read_reg(priv->regs + GRGPIO_IEDGE) & ~mask;
+	guard(gpio_generic_lock_irqsave)(&priv->chip);
 
-	priv->gc.write_reg(priv->regs + GRGPIO_IPOL, ipol | pol);
-	priv->gc.write_reg(priv->regs + GRGPIO_IEDGE, iedge | edge);
+	ipol = gpio_generic_read_reg(&priv->chip, priv->regs + GRGPIO_IPOL) & ~mask;
+	iedge = gpio_generic_read_reg(&priv->chip, priv->regs + GRGPIO_IEDGE) & ~mask;
 
-	raw_spin_unlock_irqrestore(&priv->gc.bgpio_lock, flags);
+	gpio_generic_write_reg(&priv->chip, priv->regs + GRGPIO_IPOL, ipol | pol);
+	gpio_generic_write_reg(&priv->chip, priv->regs + GRGPIO_IEDGE, iedge | edge);
 
 	return 0;
 }
@@ -162,44 +160,42 @@ static void grgpio_irq_mask(struct irq_data *d)
 {
 	struct grgpio_priv *priv = irq_data_get_irq_chip_data(d);
 	int offset = d->hwirq;
-	unsigned long flags;
-
-	raw_spin_lock_irqsave(&priv->gc.bgpio_lock, flags);
 
-	grgpio_set_imask(priv, offset, 0);
+	scoped_guard(gpio_generic_lock_irqsave, &priv->chip)
+		grgpio_set_imask(priv, offset, 0);
 
-	raw_spin_unlock_irqrestore(&priv->gc.bgpio_lock, flags);
+	gpiochip_disable_irq(&priv->chip.gc, d->hwirq);
 }
 
 static void grgpio_irq_unmask(struct irq_data *d)
 {
 	struct grgpio_priv *priv = irq_data_get_irq_chip_data(d);
 	int offset = d->hwirq;
-	unsigned long flags;
 
-	raw_spin_lock_irqsave(&priv->gc.bgpio_lock, flags);
+	gpiochip_enable_irq(&priv->chip.gc, d->hwirq);
 
-	grgpio_set_imask(priv, offset, 1);
+	guard(gpio_generic_lock_irqsave)(&priv->chip);
 
-	raw_spin_unlock_irqrestore(&priv->gc.bgpio_lock, flags);
+	grgpio_set_imask(priv, offset, 1);
 }
 
-static struct irq_chip grgpio_irq_chip = {
+static const struct irq_chip grgpio_irq_chip = {
 	.name			= "grgpio",
 	.irq_mask		= grgpio_irq_mask,
 	.irq_unmask		= grgpio_irq_unmask,
 	.irq_set_type		= grgpio_irq_set_type,
+	.flags = IRQCHIP_IMMUTABLE,
+	GPIOCHIP_IRQ_RESOURCE_HELPERS,
 };
 
 static irqreturn_t grgpio_irq_handler(int irq, void *dev)
 {
 	struct grgpio_priv *priv = dev;
-	int ngpio = priv->gc.ngpio;
-	unsigned long flags;
+	int ngpio = priv->chip.gc.ngpio;
 	int i;
 	int match = 0;
 
-	raw_spin_lock_irqsave(&priv->gc.bgpio_lock, flags);
+	guard(gpio_generic_lock_irqsave)(&priv->chip);
 
 	/*
 	 * For each gpio line, call its interrupt handler if it its underlying
@@ -215,8 +211,6 @@ static irqreturn_t grgpio_irq_handler(int irq, void *dev)
 		}
 	}
 
-	raw_spin_unlock_irqrestore(&priv->gc.bgpio_lock, flags);
-
 	if (!match)
 		dev_warn(priv->dev, "No gpio line matched irq %d\n", irq);
 
@@ -247,26 +241,23 @@ static int grgpio_irq_map(struct irq_domain *d, unsigned int irq,
 	dev_dbg(priv->dev, "Mapping irq %d for gpio line %d\n",
 		irq, offset);
 
-	raw_spin_lock_irqsave(&priv->gc.bgpio_lock, flags);
-
-	/* Request underlying irq if not already requested */
+	gpio_generic_chip_lock_irqsave(&priv->chip, flags);
 	lirq->irq = irq;
 	uirq = &priv->uirqs[lirq->index];
-	if (uirq->refcnt == 0) {
-		raw_spin_unlock_irqrestore(&priv->gc.bgpio_lock, flags);
+	gpio_generic_chip_unlock_irqrestore(&priv->chip, flags);
+
+	/* Request underlying irq if not already requested */
+	if (atomic_fetch_add(1, &uirq->refcnt) == 0) {
 		ret = request_irq(uirq->uirq, grgpio_irq_handler, 0,
 				  dev_name(priv->dev), priv);
 		if (ret) {
 			dev_err(priv->dev,
 				"Could not request underlying irq %d\n",
 				uirq->uirq);
+			atomic_dec(&uirq->refcnt); /* rollback */
 			return ret;
 		}
-		raw_spin_lock_irqsave(&priv->gc.bgpio_lock, flags);
 	}
-	uirq->refcnt++;
-
-	raw_spin_unlock_irqrestore(&priv->gc.bgpio_lock, flags);
 
 	/* Setup irq  */
 	irq_set_chip_data(irq, priv);
@@ -284,13 +275,13 @@ static void grgpio_irq_unmap(struct irq_domain *d, unsigned int irq)
 	struct grgpio_lirq *lirq;
 	struct grgpio_uirq *uirq;
 	unsigned long flags;
-	int ngpio = priv->gc.ngpio;
+	int ngpio = priv->chip.gc.ngpio;
 	int i;
 
 	irq_set_chip_and_handler(irq, NULL, NULL);
 	irq_set_chip_data(irq, NULL);
 
-	raw_spin_lock_irqsave(&priv->gc.bgpio_lock, flags);
+	gpio_generic_chip_lock_irqsave(&priv->chip, flags);
 
 	/* Free underlying irq if last user unmapped */
 	index = -1;
@@ -307,15 +298,14 @@ static void grgpio_irq_unmap(struct irq_domain *d, unsigned int irq)
 
 	if (index >= 0) {
 		uirq = &priv->uirqs[lirq->index];
-		uirq->refcnt--;
-		if (uirq->refcnt == 0) {
-			raw_spin_unlock_irqrestore(&priv->gc.bgpio_lock, flags);
+		if (atomic_dec_and_test(&uirq->refcnt)) {
+			gpio_generic_chip_unlock_irqrestore(&priv->chip, flags);
 			free_irq(uirq->uirq, priv);
 			return;
 		}
 	}
 
-	raw_spin_unlock_irqrestore(&priv->gc.bgpio_lock, flags);
+	gpio_generic_chip_unlock_irqrestore(&priv->chip, flags);
 }
 
 static void grgpio_irq_domain_remove(void *data)
@@ -335,6 +325,7 @@ static const struct irq_domain_ops grgpio_irq_domain_ops = {
 static int grgpio_probe(struct platform_device *ofdev)
 {
 	struct device_node *np = ofdev->dev.of_node;
+	struct gpio_generic_chip_config config;
 	struct device *dev = &ofdev->dev;
 	void  __iomem *regs;
 	struct gpio_chip *gc;
@@ -353,17 +344,24 @@ static int grgpio_probe(struct platform_device *ofdev)
 	if (IS_ERR(regs))
 		return PTR_ERR(regs);
 
-	gc = &priv->gc;
-	err = bgpio_init(gc, dev, 4, regs + GRGPIO_DATA,
-			 regs + GRGPIO_OUTPUT, NULL, regs + GRGPIO_DIR, NULL,
-			 BGPIOF_BIG_ENDIAN_BYTE_ORDER);
+	config = (struct gpio_generic_chip_config) {
+		.dev = dev,
+		.sz = 4,
+		.dat = regs + GRGPIO_DATA,
+		.set = regs + GRGPIO_OUTPUT,
+		.dirout = regs + GRGPIO_DIR,
+		.flags = GPIO_GENERIC_BIG_ENDIAN_BYTE_ORDER,
+	};
+
+	gc = &priv->chip.gc;
+	err = gpio_generic_chip_init(&priv->chip, &config);
 	if (err) {
-		dev_err(dev, "bgpio_init() failed\n");
+		dev_err(dev, "failed to initialize the generic GPIO chip\n");
 		return err;
 	}
 
 	priv->regs = regs;
-	priv->imask = gc->read_reg(regs + GRGPIO_IMASK);
+	priv->imask = gpio_generic_read_reg(&priv->chip, regs + GRGPIO_IMASK);
 	priv->dev = dev;
 
 	gc->owner = THIS_MODULE;
@@ -396,9 +394,8 @@ static int grgpio_probe(struct platform_device *ofdev)
 			return -EINVAL;
 		}
 
-		priv->domain = irq_domain_add_linear(np, gc->ngpio,
-						     &grgpio_irq_domain_ops,
-						     priv);
+		priv->domain = irq_domain_create_linear(dev_fwnode(&ofdev->dev), gc->ngpio,
+							&grgpio_irq_domain_ops, priv);
 		if (!priv->domain) {
 			dev_err(dev, "Could not add irq domain\n");
 			return -EINVAL;
@@ -428,6 +425,7 @@ static int grgpio_probe(struct platform_device *ofdev)
 				continue;
 			}
 			priv->uirqs[lirq->index].uirq = ret;
+			atomic_set(&priv->uirqs[lirq->index].refcnt, 0);
 		}
 	}
 
@@ -438,7 +436,7 @@ static int grgpio_probe(struct platform_device *ofdev)
 	}
 
 	dev_info(dev, "regs=0x%p, base=%d, ngpio=%d, irqs=%s\n",
-		 priv->regs, gc->base, gc->ngpio, priv->domain ? "on" : "off");
+		 priv->regs, gc->base, gc->ngpio, str_on_off(priv->domain));
 
 	return 0;
 }