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linux/drivers/gpio/gpio-ath79.c
Rob Herring e91d0f05e6 gpio: Explicitly include correct DT includes 
The DT of_device.h and of_platform.h date back to the separate
of_platform_bus_type before it as merged into the regular platform bus.
As part of that merge prepping Arm DT support 13 years ago, they
"temporarily" include each other. They also include platform_device.h
and of.h. As a result, there's a pretty much random mix of those include
files used throughout the tree. In order to detangle these headers and
replace the implicit includes with struct declarations, users need to
explicitly include the correct includes.

Signed-off-by: Rob Herring <robh@kernel.org>
Reviewed-by: Andy Shevchenko <andy.shevchenko@gmail.com>
Acked-by: Romain Perier <romain.perier@gmail.com>
Signed-off-by: Bartosz Golaszewski <bartosz.golaszewski@linaro.org>
2023-07-19 13:24:01 +02:00

309 lines
8.2 KiB
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// SPDX-License-Identifier: GPL-2.0-only
/*
* Atheros AR71XX/AR724X/AR913X GPIO API support
*
* Copyright (C) 2015 Alban Bedel <albeu@free.fr>
* Copyright (C) 2010-2011 Jaiganesh Narayanan <jnarayanan@atheros.com>
* Copyright (C) 2008-2011 Gabor Juhos <juhosg@openwrt.org>
* Copyright (C) 2008 Imre Kaloz <kaloz@openwrt.org>
*/
#include <linux/gpio/driver.h>
#include <linux/platform_device.h>
#include <linux/platform_data/gpio-ath79.h>
#include <linux/of.h>
#include <linux/interrupt.h>
#include <linux/module.h>
#include <linux/irq.h>
#define AR71XX_GPIO_REG_OE 0x00
#define AR71XX_GPIO_REG_IN 0x04
#define AR71XX_GPIO_REG_SET 0x0c
#define AR71XX_GPIO_REG_CLEAR 0x10
#define AR71XX_GPIO_REG_INT_ENABLE 0x14
#define AR71XX_GPIO_REG_INT_TYPE 0x18
#define AR71XX_GPIO_REG_INT_POLARITY 0x1c
#define AR71XX_GPIO_REG_INT_PENDING 0x20
#define AR71XX_GPIO_REG_INT_MASK 0x24
struct ath79_gpio_ctrl {
struct gpio_chip gc;
void __iomem *base;
raw_spinlock_t lock;
unsigned long both_edges;
};
static struct ath79_gpio_ctrl *irq_data_to_ath79_gpio(struct irq_data *data)
{
struct gpio_chip *gc = irq_data_get_irq_chip_data(data);
return container_of(gc, struct ath79_gpio_ctrl, gc);
}
static u32 ath79_gpio_read(struct ath79_gpio_ctrl *ctrl, unsigned reg)
{
return readl(ctrl->base + reg);
}
static void ath79_gpio_write(struct ath79_gpio_ctrl *ctrl,
unsigned reg, u32 val)
{
writel(val, ctrl->base + reg);
}
static bool ath79_gpio_update_bits(
struct ath79_gpio_ctrl *ctrl, unsigned reg, u32 mask, u32 bits)
{
u32 old_val, new_val;
old_val = ath79_gpio_read(ctrl, reg);
new_val = (old_val & ~mask) | (bits & mask);
if (new_val != old_val)
ath79_gpio_write(ctrl, reg, new_val);
return new_val != old_val;
}
static void ath79_gpio_irq_unmask(struct irq_data *data)
{
struct ath79_gpio_ctrl *ctrl = irq_data_to_ath79_gpio(data);
u32 mask = BIT(irqd_to_hwirq(data));
unsigned long flags;
gpiochip_enable_irq(&ctrl->gc, irqd_to_hwirq(data));
raw_spin_lock_irqsave(&ctrl->lock, flags);
ath79_gpio_update_bits(ctrl, AR71XX_GPIO_REG_INT_MASK, mask, mask);
raw_spin_unlock_irqrestore(&ctrl->lock, flags);
}
static void ath79_gpio_irq_mask(struct irq_data *data)
{
struct ath79_gpio_ctrl *ctrl = irq_data_to_ath79_gpio(data);
u32 mask = BIT(irqd_to_hwirq(data));
unsigned long flags;
raw_spin_lock_irqsave(&ctrl->lock, flags);
ath79_gpio_update_bits(ctrl, AR71XX_GPIO_REG_INT_MASK, mask, 0);
raw_spin_unlock_irqrestore(&ctrl->lock, flags);
gpiochip_disable_irq(&ctrl->gc, irqd_to_hwirq(data));
}
static void ath79_gpio_irq_enable(struct irq_data *data)
{
struct ath79_gpio_ctrl *ctrl = irq_data_to_ath79_gpio(data);
u32 mask = BIT(irqd_to_hwirq(data));
unsigned long flags;
raw_spin_lock_irqsave(&ctrl->lock, flags);
ath79_gpio_update_bits(ctrl, AR71XX_GPIO_REG_INT_ENABLE, mask, mask);
ath79_gpio_update_bits(ctrl, AR71XX_GPIO_REG_INT_MASK, mask, mask);
raw_spin_unlock_irqrestore(&ctrl->lock, flags);
}
static void ath79_gpio_irq_disable(struct irq_data *data)
{
struct ath79_gpio_ctrl *ctrl = irq_data_to_ath79_gpio(data);
u32 mask = BIT(irqd_to_hwirq(data));
unsigned long flags;
raw_spin_lock_irqsave(&ctrl->lock, flags);
ath79_gpio_update_bits(ctrl, AR71XX_GPIO_REG_INT_MASK, mask, 0);
ath79_gpio_update_bits(ctrl, AR71XX_GPIO_REG_INT_ENABLE, mask, 0);
raw_spin_unlock_irqrestore(&ctrl->lock, flags);
}
static int ath79_gpio_irq_set_type(struct irq_data *data,
unsigned int flow_type)
{
struct ath79_gpio_ctrl *ctrl = irq_data_to_ath79_gpio(data);
u32 mask = BIT(irqd_to_hwirq(data));
u32 type = 0, polarity = 0;
unsigned long flags;
bool disabled;
switch (flow_type) {
case IRQ_TYPE_EDGE_RISING:
polarity |= mask;
fallthrough;
case IRQ_TYPE_EDGE_FALLING:
case IRQ_TYPE_EDGE_BOTH:
break;
case IRQ_TYPE_LEVEL_HIGH:
polarity |= mask;
fallthrough;
case IRQ_TYPE_LEVEL_LOW:
type |= mask;
break;
default:
return -EINVAL;
}
raw_spin_lock_irqsave(&ctrl->lock, flags);
if (flow_type == IRQ_TYPE_EDGE_BOTH) {
ctrl->both_edges |= mask;
polarity = ~ath79_gpio_read(ctrl, AR71XX_GPIO_REG_IN);
} else {
ctrl->both_edges &= ~mask;
}
/* As the IRQ configuration can't be loaded atomically we
* have to disable the interrupt while the configuration state
* is invalid.
*/
disabled = ath79_gpio_update_bits(
ctrl, AR71XX_GPIO_REG_INT_ENABLE, mask, 0);
ath79_gpio_update_bits(
ctrl, AR71XX_GPIO_REG_INT_TYPE, mask, type);
ath79_gpio_update_bits(
ctrl, AR71XX_GPIO_REG_INT_POLARITY, mask, polarity);
if (disabled)
ath79_gpio_update_bits(
ctrl, AR71XX_GPIO_REG_INT_ENABLE, mask, mask);
raw_spin_unlock_irqrestore(&ctrl->lock, flags);
return 0;
}
static const struct irq_chip ath79_gpio_irqchip = {
.name = "gpio-ath79",
.irq_enable = ath79_gpio_irq_enable,
.irq_disable = ath79_gpio_irq_disable,
.irq_mask = ath79_gpio_irq_mask,
.irq_unmask = ath79_gpio_irq_unmask,
.irq_set_type = ath79_gpio_irq_set_type,
.flags = IRQCHIP_IMMUTABLE,
GPIOCHIP_IRQ_RESOURCE_HELPERS,
};
static void ath79_gpio_irq_handler(struct irq_desc *desc)
{
struct gpio_chip *gc = irq_desc_get_handler_data(desc);
struct irq_chip *irqchip = irq_desc_get_chip(desc);
struct ath79_gpio_ctrl *ctrl =
container_of(gc, struct ath79_gpio_ctrl, gc);
unsigned long flags, pending;
u32 both_edges, state;
int irq;
chained_irq_enter(irqchip, desc);
raw_spin_lock_irqsave(&ctrl->lock, flags);
pending = ath79_gpio_read(ctrl, AR71XX_GPIO_REG_INT_PENDING);
/* Update the polarity of the both edges irqs */
both_edges = ctrl->both_edges & pending;
if (both_edges) {
state = ath79_gpio_read(ctrl, AR71XX_GPIO_REG_IN);
ath79_gpio_update_bits(ctrl, AR71XX_GPIO_REG_INT_POLARITY,
both_edges, ~state);
}
raw_spin_unlock_irqrestore(&ctrl->lock, flags);
for_each_set_bit(irq, &pending, gc->ngpio)
generic_handle_domain_irq(gc->irq.domain, irq);
chained_irq_exit(irqchip, desc);
}
static const struct of_device_id ath79_gpio_of_match[] = {
{ .compatible = "qca,ar7100-gpio" },
{ .compatible = "qca,ar9340-gpio" },
{},
};
MODULE_DEVICE_TABLE(of, ath79_gpio_of_match);
static int ath79_gpio_probe(struct platform_device *pdev)
{
struct ath79_gpio_platform_data *pdata = dev_get_platdata(&pdev->dev);
struct device *dev = &pdev->dev;
struct device_node *np = dev->of_node;
struct ath79_gpio_ctrl *ctrl;
struct gpio_irq_chip *girq;
u32 ath79_gpio_count;
bool oe_inverted;
int err;
ctrl = devm_kzalloc(dev, sizeof(*ctrl), GFP_KERNEL);
if (!ctrl)
return -ENOMEM;
if (np) {
err = of_property_read_u32(np, "ngpios", &ath79_gpio_count);
if (err) {
dev_err(dev, "ngpios property is not valid\n");
return err;
}
oe_inverted = of_device_is_compatible(np, "qca,ar9340-gpio");
} else if (pdata) {
ath79_gpio_count = pdata->ngpios;
oe_inverted = pdata->oe_inverted;
} else {
dev_err(dev, "No DT node or platform data found\n");
return -EINVAL;
}
if (ath79_gpio_count >= 32) {
dev_err(dev, "ngpios must be less than 32\n");
return -EINVAL;
}
ctrl->base = devm_platform_ioremap_resource(pdev, 0);
if (IS_ERR(ctrl->base))
return PTR_ERR(ctrl->base);
raw_spin_lock_init(&ctrl->lock);
err = bgpio_init(&ctrl->gc, dev, 4,
ctrl->base + AR71XX_GPIO_REG_IN,
ctrl->base + AR71XX_GPIO_REG_SET,
ctrl->base + AR71XX_GPIO_REG_CLEAR,
oe_inverted ? NULL : ctrl->base + AR71XX_GPIO_REG_OE,
oe_inverted ? ctrl->base + AR71XX_GPIO_REG_OE : NULL,
0);
if (err) {
dev_err(dev, "bgpio_init failed\n");
return err;
}
/* Use base 0 to stay compatible with legacy platforms */
ctrl->gc.base = 0;
/* Optional interrupt setup */
if (!np || of_property_read_bool(np, "interrupt-controller")) {
girq = &ctrl->gc.irq;
gpio_irq_chip_set_chip(girq, &ath79_gpio_irqchip);
girq->parent_handler = ath79_gpio_irq_handler;
girq->num_parents = 1;
girq->parents = devm_kcalloc(dev, 1, sizeof(*girq->parents),
GFP_KERNEL);
if (!girq->parents)
return -ENOMEM;
girq->parents[0] = platform_get_irq(pdev, 0);
girq->default_type = IRQ_TYPE_NONE;
girq->handler = handle_simple_irq;
}
return devm_gpiochip_add_data(dev, &ctrl->gc, ctrl);
}
static struct platform_driver ath79_gpio_driver = {
.driver = {
.name = "ath79-gpio",
.of_match_table = ath79_gpio_of_match,
},
.probe = ath79_gpio_probe,
};
module_platform_driver(ath79_gpio_driver);
MODULE_DESCRIPTION("Atheros AR71XX/AR724X/AR913X GPIO API support");
MODULE_LICENSE("GPL v2");
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