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path: root/drivers/gpio/gpio-pl061.c
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Diffstat (limited to 'drivers/gpio/gpio-pl061.c')
-rw-r--r--drivers/gpio/gpio-pl061.c133
1 files changed, 67 insertions, 66 deletions
diff --git a/drivers/gpio/gpio-pl061.c b/drivers/gpio/gpio-pl061.c
index dc42571e6fdc..919cf86fd590 100644
--- a/drivers/gpio/gpio-pl061.c
+++ b/drivers/gpio/gpio-pl061.c
@@ -1,31 +1,30 @@
+// SPDX-License-Identifier: GPL-2.0-only
/*
* Copyright (C) 2008, 2009 Provigent Ltd.
*
* Author: Baruch Siach <baruch@tkos.co.il>
*
- * This program is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License version 2 as
- * published by the Free Software Foundation.
- *
* Driver for the ARM PrimeCell(tm) General Purpose Input/Output (PL061)
*
* Data sheet: ARM DDI 0190B, September 2000
*/
-#include <linux/spinlock.h>
+#include <linux/amba/bus.h>
+#include <linux/bitops.h>
+#include <linux/device.h>
#include <linux/errno.h>
+#include <linux/gpio/driver.h>
#include <linux/init.h>
+#include <linux/interrupt.h>
#include <linux/io.h>
#include <linux/ioport.h>
-#include <linux/interrupt.h>
#include <linux/irq.h>
#include <linux/irqchip/chained_irq.h>
-#include <linux/bitops.h>
-#include <linux/gpio/driver.h>
-#include <linux/device.h>
-#include <linux/amba/bus.h>
-#include <linux/slab.h>
+#include <linux/module.h>
#include <linux/pinctrl/consumer.h>
#include <linux/pm.h>
+#include <linux/seq_file.h>
+#include <linux/slab.h>
+#include <linux/spinlock.h>
#define GPIODIR 0x400
#define GPIOIS 0x404
@@ -38,7 +37,6 @@
#define PL061_GPIO_NR 8
-#ifdef CONFIG_PM
struct pl061_context_save_regs {
u8 gpio_data;
u8 gpio_dir;
@@ -47,26 +45,25 @@ struct pl061_context_save_regs {
u8 gpio_iev;
u8 gpio_ie;
};
-#endif
struct pl061 {
raw_spinlock_t lock;
void __iomem *base;
struct gpio_chip gc;
- struct irq_chip irq_chip;
int parent_irq;
-#ifdef CONFIG_PM
struct pl061_context_save_regs csave_regs;
-#endif
};
static int pl061_get_direction(struct gpio_chip *gc, unsigned offset)
{
struct pl061 *pl061 = gpiochip_get_data(gc);
- return !(readb(pl061->base + GPIODIR) & BIT(offset));
+ if (readb(pl061->base + GPIODIR) & BIT(offset))
+ return GPIO_LINE_DIRECTION_OUT;
+
+ return GPIO_LINE_DIRECTION_IN;
}
static int pl061_direction_input(struct gpio_chip *gc, unsigned offset)
@@ -114,11 +111,13 @@ static int pl061_get_value(struct gpio_chip *gc, unsigned offset)
return !!readb(pl061->base + (BIT(offset + 2)));
}
-static void pl061_set_value(struct gpio_chip *gc, unsigned offset, int value)
+static int pl061_set_value(struct gpio_chip *gc, unsigned int offset, int value)
{
struct pl061 *pl061 = gpiochip_get_data(gc);
writeb(!!value << offset, pl061->base + (BIT(offset + 2)));
+
+ return 0;
}
static int pl061_irq_type(struct irq_data *d, unsigned trigger)
@@ -222,8 +221,8 @@ static void pl061_irq_handler(struct irq_desc *desc)
pending = readb(pl061->base + GPIOMIS);
if (pending) {
for_each_set_bit(offset, &pending, PL061_GPIO_NR)
- generic_handle_irq(irq_find_mapping(gc->irq.domain,
- offset));
+ generic_handle_domain_irq(gc->irq.domain,
+ offset);
}
chained_irq_exit(irqchip, desc);
@@ -240,6 +239,8 @@ static void pl061_irq_mask(struct irq_data *d)
gpioie = readb(pl061->base + GPIOIE) & ~mask;
writeb(gpioie, pl061->base + GPIOIE);
raw_spin_unlock(&pl061->lock);
+
+ gpiochip_disable_irq(gc, d->hwirq);
}
static void pl061_irq_unmask(struct irq_data *d)
@@ -249,6 +250,8 @@ static void pl061_irq_unmask(struct irq_data *d)
u8 mask = BIT(irqd_to_hwirq(d) % PL061_GPIO_NR);
u8 gpioie;
+ gpiochip_enable_irq(gc, d->hwirq);
+
raw_spin_lock(&pl061->lock);
gpioie = readb(pl061->base + GPIOIE) | mask;
writeb(gpioie, pl061->base + GPIOIE);
@@ -282,10 +285,29 @@ static int pl061_irq_set_wake(struct irq_data *d, unsigned int state)
return irq_set_irq_wake(pl061->parent_irq, state);
}
+static void pl061_irq_print_chip(struct irq_data *data, struct seq_file *p)
+{
+ struct gpio_chip *gc = irq_data_get_irq_chip_data(data);
+
+ seq_puts(p, dev_name(gc->parent));
+}
+
+static const struct irq_chip pl061_irq_chip = {
+ .irq_ack = pl061_irq_ack,
+ .irq_mask = pl061_irq_mask,
+ .irq_unmask = pl061_irq_unmask,
+ .irq_set_type = pl061_irq_type,
+ .irq_set_wake = pl061_irq_set_wake,
+ .irq_print_chip = pl061_irq_print_chip,
+ .flags = IRQCHIP_IMMUTABLE,
+ GPIOCHIP_IRQ_RESOURCE_HELPERS,
+};
+
static int pl061_probe(struct amba_device *adev, const struct amba_id *id)
{
struct device *dev = &adev->dev;
struct pl061 *pl061;
+ struct gpio_irq_chip *girq;
int ret, irq;
pl061 = devm_kzalloc(dev, sizeof(*pl061), GFP_KERNEL);
@@ -297,11 +319,8 @@ static int pl061_probe(struct amba_device *adev, const struct amba_id *id)
return PTR_ERR(pl061->base);
raw_spin_lock_init(&pl061->lock);
- if (of_property_read_bool(dev->of_node, "gpio-ranges")) {
- pl061->gc.request = gpiochip_generic_request;
- pl061->gc.free = gpiochip_generic_free;
- }
-
+ pl061->gc.request = gpiochip_generic_request;
+ pl061->gc.free = gpiochip_generic_free;
pl061->gc.base = -1;
pl061->gc.get_direction = pl061_get_direction;
pl061->gc.direction_input = pl061_direction_input;
@@ -313,46 +332,37 @@ static int pl061_probe(struct amba_device *adev, const struct amba_id *id)
pl061->gc.parent = dev;
pl061->gc.owner = THIS_MODULE;
- ret = gpiochip_add_data(&pl061->gc, pl061);
- if (ret)
- return ret;
-
/*
* irq_chip support
*/
- pl061->irq_chip.name = dev_name(dev);
- pl061->irq_chip.irq_ack = pl061_irq_ack;
- pl061->irq_chip.irq_mask = pl061_irq_mask;
- pl061->irq_chip.irq_unmask = pl061_irq_unmask;
- pl061->irq_chip.irq_set_type = pl061_irq_type;
- pl061->irq_chip.irq_set_wake = pl061_irq_set_wake;
-
writeb(0, pl061->base + GPIOIE); /* disable irqs */
irq = adev->irq[0];
- if (irq < 0) {
- dev_err(&adev->dev, "invalid IRQ\n");
- return -ENODEV;
- }
+ if (!irq)
+ dev_warn(&adev->dev, "IRQ support disabled\n");
pl061->parent_irq = irq;
- ret = gpiochip_irqchip_add(&pl061->gc, &pl061->irq_chip,
- 0, handle_bad_irq,
- IRQ_TYPE_NONE);
- if (ret) {
- dev_info(&adev->dev, "could not add irqchip\n");
+ girq = &pl061->gc.irq;
+ gpio_irq_chip_set_chip(girq, &pl061_irq_chip);
+ girq->parent_handler = pl061_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] = irq;
+ girq->default_type = IRQ_TYPE_NONE;
+ girq->handler = handle_bad_irq;
+
+ ret = devm_gpiochip_add_data(dev, &pl061->gc, pl061);
+ if (ret)
return ret;
- }
- gpiochip_set_chained_irqchip(&pl061->gc, &pl061->irq_chip,
- irq, pl061_irq_handler);
amba_set_drvdata(adev, pl061);
- dev_info(&adev->dev, "PL061 GPIO chip @%pa registered\n",
- &adev->res.start);
+ dev_info(dev, "PL061 GPIO chip registered\n");
return 0;
}
-#ifdef CONFIG_PM
static int pl061_suspend(struct device *dev)
{
struct pl061 *pl061 = dev_get_drvdata(dev);
@@ -396,13 +406,7 @@ static int pl061_resume(struct device *dev)
return 0;
}
-static const struct dev_pm_ops pl061_dev_pm_ops = {
- .suspend = pl061_suspend,
- .resume = pl061_resume,
- .freeze = pl061_suspend,
- .restore = pl061_resume,
-};
-#endif
+static DEFINE_SIMPLE_DEV_PM_OPS(pl061_dev_pm_ops, pl061_suspend, pl061_resume);
static const struct amba_id pl061_ids[] = {
{
@@ -411,20 +415,17 @@ static const struct amba_id pl061_ids[] = {
},
{ 0, 0 },
};
+MODULE_DEVICE_TABLE(amba, pl061_ids);
static struct amba_driver pl061_gpio_driver = {
.drv = {
.name = "pl061_gpio",
-#ifdef CONFIG_PM
- .pm = &pl061_dev_pm_ops,
-#endif
+ .pm = pm_sleep_ptr(&pl061_dev_pm_ops),
},
.id_table = pl061_ids,
.probe = pl061_probe,
};
+module_amba_driver(pl061_gpio_driver);
-static int __init pl061_gpio_init(void)
-{
- return amba_driver_register(&pl061_gpio_driver);
-}
-device_initcall(pl061_gpio_init);
+MODULE_DESCRIPTION("Driver for the ARM PrimeCell(tm) General Purpose Input/Output (PL061)");
+MODULE_LICENSE("GPL v2");
generated by cgit (git 2.34.1) at 2025-12-24 22:57:57 +0000