[PATCH 6/8] gpio: ws16c48: Utilize iomap interface

[William Breathitt Gray]

This driver doesn't need to access I/O ports directly via inb()/outb()
and friends. This patch abstracts such access by calling ioport_map()
to enable the use of more typical ioread8()/iowrite8() I/O memory
accessor calls.

Suggested-by: David Laight <David.Laight@xxxxxxxxxx>
Signed-off-by: William Breathitt Gray <william.gray@xxxxxxxxxx>
---
 drivers/gpio/gpio-ws16c48.c | 65 +++++++++++++++++++------------------
 1 file changed, 34 insertions(+), 31 deletions(-)

diff --git a/drivers/gpio/gpio-ws16c48.c b/drivers/gpio/gpio-ws16c48.c
index bb02a82e22f4..5078631d8014 100644
--- a/drivers/gpio/gpio-ws16c48.c
+++ b/drivers/gpio/gpio-ws16c48.c
@@ -47,7 +47,7 @@ struct ws16c48_gpio {
 	raw_spinlock_t lock;
 	unsigned long irq_mask;
 	unsigned long flow_mask;
-	unsigned base;
+	void __iomem *base;
 };
 
 static int ws16c48_gpio_get_direction(struct gpio_chip *chip, unsigned offset)
@@ -73,7 +73,7 @@ static int ws16c48_gpio_direction_input(struct gpio_chip *chip, unsigned offset)
 
 	ws16c48gpio->io_state[port] |= mask;
 	ws16c48gpio->out_state[port] &= ~mask;
-	outb(ws16c48gpio->out_state[port], ws16c48gpio->base + port);
+	iowrite8(ws16c48gpio->out_state[port], ws16c48gpio->base + port);
 
 	raw_spin_unlock_irqrestore(&ws16c48gpio->lock, flags);
 
@@ -95,7 +95,7 @@ static int ws16c48_gpio_direction_output(struct gpio_chip *chip,
 		ws16c48gpio->out_state[port] |= mask;
 	else
 		ws16c48gpio->out_state[port] &= ~mask;
-	outb(ws16c48gpio->out_state[port], ws16c48gpio->base + port);
+	iowrite8(ws16c48gpio->out_state[port], ws16c48gpio->base + port);
 
 	raw_spin_unlock_irqrestore(&ws16c48gpio->lock, flags);
 
@@ -118,7 +118,7 @@ static int ws16c48_gpio_get(struct gpio_chip *chip, unsigned offset)
 		return -EINVAL;
 	}
 
-	port_state = inb(ws16c48gpio->base + port);
+	port_state = ioread8(ws16c48gpio->base + port);
 
 	raw_spin_unlock_irqrestore(&ws16c48gpio->lock, flags);
 
@@ -131,7 +131,7 @@ static int ws16c48_gpio_get_multiple(struct gpio_chip *chip,
 	struct ws16c48_gpio *const ws16c48gpio = gpiochip_get_data(chip);
 	unsigned long offset;
 	unsigned long gpio_mask;
-	unsigned int port_addr;
+	void __iomem *port_addr;
 	unsigned long port_state;
 
 	/* clear bits array to a clean slate */
@@ -139,7 +139,7 @@ static int ws16c48_gpio_get_multiple(struct gpio_chip *chip,
 
 	for_each_set_clump8(offset, gpio_mask, mask, chip->ngpio) {
 		port_addr = ws16c48gpio->base + offset / 8;
-		port_state = inb(port_addr) & gpio_mask;
+		port_state = ioread8(port_addr) & gpio_mask;
 
 		bitmap_set_value8(bits, port_state, offset);
 	}
@@ -166,7 +166,7 @@ static void ws16c48_gpio_set(struct gpio_chip *chip, unsigned offset, int value)
 		ws16c48gpio->out_state[port] |= mask;
 	else
 		ws16c48gpio->out_state[port] &= ~mask;
-	outb(ws16c48gpio->out_state[port], ws16c48gpio->base + port);
+	iowrite8(ws16c48gpio->out_state[port], ws16c48gpio->base + port);
 
 	raw_spin_unlock_irqrestore(&ws16c48gpio->lock, flags);
 }
@@ -178,7 +178,7 @@ static void ws16c48_gpio_set_multiple(struct gpio_chip *chip,
 	unsigned long offset;
 	unsigned long gpio_mask;
 	size_t index;
-	unsigned int port_addr;
+	void __iomem *port_addr;
 	unsigned long bitmask;
 	unsigned long flags;
 
@@ -195,7 +195,7 @@ static void ws16c48_gpio_set_multiple(struct gpio_chip *chip,
 		/* update output state data and set device gpio register */
 		ws16c48gpio->out_state[index] &= ~gpio_mask;
 		ws16c48gpio->out_state[index] |= bitmask;
-		outb(ws16c48gpio->out_state[index], port_addr);
+		iowrite8(ws16c48gpio->out_state[index], port_addr);
 
 		raw_spin_unlock_irqrestore(&ws16c48gpio->lock, flags);
 	}
@@ -219,10 +219,10 @@ static void ws16c48_irq_ack(struct irq_data *data)
 
 	port_state = ws16c48gpio->irq_mask >> (8*port);
 
-	outb(0x80, ws16c48gpio->base + 7);
-	outb(port_state & ~mask, ws16c48gpio->base + 8 + port);
-	outb(port_state | mask, ws16c48gpio->base + 8 + port);
-	outb(0xC0, ws16c48gpio->base + 7);
+	iowrite8(0x80, ws16c48gpio->base + 7);
+	iowrite8(port_state & ~mask, ws16c48gpio->base + 8 + port);
+	iowrite8(port_state | mask, ws16c48gpio->base + 8 + port);
+	iowrite8(0xC0, ws16c48gpio->base + 7);
 
 	raw_spin_unlock_irqrestore(&ws16c48gpio->lock, flags);
 }
@@ -244,9 +244,9 @@ static void ws16c48_irq_mask(struct irq_data *data)
 
 	ws16c48gpio->irq_mask &= ~mask;
 
-	outb(0x80, ws16c48gpio->base + 7);
-	outb(ws16c48gpio->irq_mask >> (8*port), ws16c48gpio->base + 8 + port);
-	outb(0xC0, ws16c48gpio->base + 7);
+	iowrite8(0x80, ws16c48gpio->base + 7);
+	iowrite8(ws16c48gpio->irq_mask >> (8*port), ws16c48gpio->base + 8 + port);
+	iowrite8(0xC0, ws16c48gpio->base + 7);
 
 	raw_spin_unlock_irqrestore(&ws16c48gpio->lock, flags);
 }
@@ -268,9 +268,9 @@ static void ws16c48_irq_unmask(struct irq_data *data)
 
 	ws16c48gpio->irq_mask |= mask;
 
-	outb(0x80, ws16c48gpio->base + 7);
-	outb(ws16c48gpio->irq_mask >> (8*port), ws16c48gpio->base + 8 + port);
-	outb(0xC0, ws16c48gpio->base + 7);
+	iowrite8(0x80, ws16c48gpio->base + 7);
+	iowrite8(ws16c48gpio->irq_mask >> (8*port), ws16c48gpio->base + 8 + port);
+	iowrite8(0xC0, ws16c48gpio->base + 7);
 
 	raw_spin_unlock_irqrestore(&ws16c48gpio->lock, flags);
 }
@@ -304,9 +304,9 @@ static int ws16c48_irq_set_type(struct irq_data *data, unsigned flow_type)
 		return -EINVAL;
 	}
 
-	outb(0x40, ws16c48gpio->base + 7);
-	outb(ws16c48gpio->flow_mask >> (8*port), ws16c48gpio->base + 8 + port);
-	outb(0xC0, ws16c48gpio->base + 7);
+	iowrite8(0x40, ws16c48gpio->base + 7);
+	iowrite8(ws16c48gpio->flow_mask >> (8*port), ws16c48gpio->base + 8 + port);
+	iowrite8(0xC0, ws16c48gpio->base + 7);
 
 	raw_spin_unlock_irqrestore(&ws16c48gpio->lock, flags);
 
@@ -330,20 +330,20 @@ static irqreturn_t ws16c48_irq_handler(int irq, void *dev_id)
 	unsigned long int_id;
 	unsigned long gpio;
 
-	int_pending = inb(ws16c48gpio->base + 6) & 0x7;
+	int_pending = ioread8(ws16c48gpio->base + 6) & 0x7;
 	if (!int_pending)
 		return IRQ_NONE;
 
 	/* loop until all pending interrupts are handled */
 	do {
 		for_each_set_bit(port, &int_pending, 3) {
-			int_id = inb(ws16c48gpio->base + 8 + port);
+			int_id = ioread8(ws16c48gpio->base + 8 + port);
 			for_each_set_bit(gpio, &int_id, 8)
 				generic_handle_domain_irq(chip->irq.domain,
 							  gpio + 8*port);
 		}
 
-		int_pending = inb(ws16c48gpio->base + 6) & 0x7;
+		int_pending = ioread8(ws16c48gpio->base + 6) & 0x7;
 	} while (int_pending);
 
 	return IRQ_HANDLED;
@@ -370,11 +370,11 @@ static int ws16c48_irq_init_hw(struct gpio_chip *gc)
 	struct ws16c48_gpio *const ws16c48gpio = gpiochip_get_data(gc);
 
 	/* Disable IRQ by default */
-	outb(0x80, ws16c48gpio->base + 7);
-	outb(0, ws16c48gpio->base + 8);
-	outb(0, ws16c48gpio->base + 9);
-	outb(0, ws16c48gpio->base + 10);
-	outb(0xC0, ws16c48gpio->base + 7);
+	iowrite8(0x80, ws16c48gpio->base + 7);
+	iowrite8(0, ws16c48gpio->base + 8);
+	iowrite8(0, ws16c48gpio->base + 9);
+	iowrite8(0, ws16c48gpio->base + 10);
+	iowrite8(0xC0, ws16c48gpio->base + 7);
 
 	return 0;
 }
@@ -396,6 +396,10 @@ static int ws16c48_probe(struct device *dev, unsigned int id)
 		return -EBUSY;
 	}
 
+	ws16c48gpio->base = devm_ioport_map(dev, base[id], WS16C48_EXTENT);
+	if (!ws16c48gpio->base)
+		return -ENOMEM;
+
 	ws16c48gpio->chip.label = name;
 	ws16c48gpio->chip.parent = dev;
 	ws16c48gpio->chip.owner = THIS_MODULE;
@@ -409,7 +413,6 @@ static int ws16c48_probe(struct device *dev, unsigned int id)
 	ws16c48gpio->chip.get_multiple = ws16c48_gpio_get_multiple;
 	ws16c48gpio->chip.set = ws16c48_gpio_set;
 	ws16c48gpio->chip.set_multiple = ws16c48_gpio_set_multiple;
-	ws16c48gpio->base = base[id];
 
 	girq = &ws16c48gpio->chip.irq;
 	girq->chip = &ws16c48_irqchip;
-- 
2.35.3