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Subject[PATCH 3/8] gpio: 104-idi-48: Utilize iomap interface
Date
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@ACULAB.COM>
Signed-off-by: William Breathitt Gray <william.gray@linaro.org>
---
drivers/gpio/gpio-104-idi-48.c | 27 +++++++++++++++------------
1 file changed, 15 insertions(+), 12 deletions(-)

diff --git a/drivers/gpio/gpio-104-idi-48.c b/drivers/gpio/gpio-104-idi-48.c
index 34be7dd9f5b9..9521ece3ebef 100644
--- a/drivers/gpio/gpio-104-idi-48.c
+++ b/drivers/gpio/gpio-104-idi-48.c
@@ -47,7 +47,7 @@ struct idi_48_gpio {
raw_spinlock_t lock;
spinlock_t ack_lock;
unsigned char irq_mask[6];
- unsigned base;
+ void __iomem *base;
unsigned char cos_enb;
};

@@ -66,15 +66,15 @@ static int idi_48_gpio_get(struct gpio_chip *chip, unsigned offset)
struct idi_48_gpio *const idi48gpio = gpiochip_get_data(chip);
unsigned i;
static const unsigned int register_offset[6] = { 0, 1, 2, 4, 5, 6 };
- unsigned base_offset;
+ void __iomem *port_addr;
unsigned mask;

for (i = 0; i < 48; i += 8)
if (offset < i + 8) {
- base_offset = register_offset[i / 8];
+ port_addr = idi48gpio->base + register_offset[i / 8];
mask = BIT(offset - i);

- return !!(inb(idi48gpio->base + base_offset) & mask);
+ return !!(ioread8(port_addr) & mask);
}

/* The following line should never execute since offset < 48 */
@@ -88,7 +88,7 @@ static int idi_48_gpio_get_multiple(struct gpio_chip *chip, unsigned long *mask,
unsigned long offset;
unsigned long gpio_mask;
static const size_t ports[] = { 0, 1, 2, 4, 5, 6 };
- unsigned int port_addr;
+ void __iomem *port_addr;
unsigned long port_state;

/* clear bits array to a clean slate */
@@ -96,7 +96,7 @@ static int idi_48_gpio_get_multiple(struct gpio_chip *chip, unsigned long *mask,

for_each_set_clump8(offset, gpio_mask, mask, ARRAY_SIZE(ports) * 8) {
port_addr = idi48gpio->base + ports[offset / 8];
- port_state = inb(port_addr) & gpio_mask;
+ port_state = ioread8(port_addr) & gpio_mask;

bitmap_set_value8(bits, port_state, offset);
}
@@ -130,7 +130,7 @@ static void idi_48_irq_mask(struct irq_data *data)

raw_spin_lock_irqsave(&idi48gpio->lock, flags);

- outb(idi48gpio->cos_enb, idi48gpio->base + 7);
+ iowrite8(idi48gpio->cos_enb, idi48gpio->base + 7);

raw_spin_unlock_irqrestore(&idi48gpio->lock, flags);
}
@@ -163,7 +163,7 @@ static void idi_48_irq_unmask(struct irq_data *data)

raw_spin_lock_irqsave(&idi48gpio->lock, flags);

- outb(idi48gpio->cos_enb, idi48gpio->base + 7);
+ iowrite8(idi48gpio->cos_enb, idi48gpio->base + 7);

raw_spin_unlock_irqrestore(&idi48gpio->lock, flags);
}
@@ -204,7 +204,7 @@ static irqreturn_t idi_48_irq_handler(int irq, void *dev_id)

raw_spin_lock(&idi48gpio->lock);

- cos_status = inb(idi48gpio->base + 7);
+ cos_status = ioread8(idi48gpio->base + 7);

raw_spin_unlock(&idi48gpio->lock);

@@ -250,8 +250,8 @@ static int idi_48_irq_init_hw(struct gpio_chip *gc)
struct idi_48_gpio *const idi48gpio = gpiochip_get_data(gc);

/* Disable IRQ by default */
- outb(0, idi48gpio->base + 7);
- inb(idi48gpio->base + 7);
+ iowrite8(0, idi48gpio->base + 7);
+ ioread8(idi48gpio->base + 7);

return 0;
}
@@ -273,6 +273,10 @@ static int idi_48_probe(struct device *dev, unsigned int id)
return -EBUSY;
}

+ idi48gpio->base = devm_ioport_map(dev, base[id], IDI_48_EXTENT);
+ if (!idi48gpio->base)
+ return -ENOMEM;
+
idi48gpio->chip.label = name;
idi48gpio->chip.parent = dev;
idi48gpio->chip.owner = THIS_MODULE;
@@ -283,7 +287,6 @@ static int idi_48_probe(struct device *dev, unsigned int id)
idi48gpio->chip.direction_input = idi_48_gpio_direction_input;
idi48gpio->chip.get = idi_48_gpio_get;
idi48gpio->chip.get_multiple = idi_48_gpio_get_multiple;
- idi48gpio->base = base[id];

girq = &idi48gpio->chip.irq;
girq->chip = &idi_48_irqchip;
--
2.35.3
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