korg/linux
0
0
Fork 0
mirror of https://mirrors.bfsu.edu.cn/git/linux.git synced 2024-12-26 12:34:41 +08:00
Code Issues Packages Projects Releases Wiki Activity
c446d9da64
linux/drivers/gpio/gpio-sprd.c
Alexandru Ardelean 52f39cfee6 gpio: sprd: remove platform_set_drvdata() + cleanup probe 
The platform_set_drvdata() call is only useful if we need to retrieve back
the private information.
Since the driver doesn't do that, it's not useful to have it.

If this is removed, we can also just do a direct return on
devm_gpiochip_add_data(). We don't need to print that this call failed as
there are other ways to log/see this during probe.

Signed-off-by: Alexandru Ardelean <aardelean@deviqon.com>
Signed-off-by: Bartosz Golaszewski <bgolaszewski@baylibre.com>
2021-05-25 16:14:56 +02:00

282 lines
7.8 KiB
C
Raw Blame History

// SPDX-License-Identifier: GPL-2.0
/*
* Copyright (C) 2018 Spreadtrum Communications Inc.
* Copyright (C) 2018 Linaro Ltd.
*/
#include <linux/bitops.h>
#include <linux/gpio/driver.h>
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/of_device.h>
#include <linux/platform_device.h>
#include <linux/spinlock.h>
/* GPIO registers definition */
#define SPRD_GPIO_DATA 0x0
#define SPRD_GPIO_DMSK 0x4
#define SPRD_GPIO_DIR 0x8
#define SPRD_GPIO_IS 0xc
#define SPRD_GPIO_IBE 0x10
#define SPRD_GPIO_IEV 0x14
#define SPRD_GPIO_IE 0x18
#define SPRD_GPIO_RIS 0x1c
#define SPRD_GPIO_MIS 0x20
#define SPRD_GPIO_IC 0x24
#define SPRD_GPIO_INEN 0x28
/* We have 16 banks GPIOs and each bank contain 16 GPIOs */
#define SPRD_GPIO_BANK_NR 16
#define SPRD_GPIO_NR 256
#define SPRD_GPIO_BANK_SIZE 0x80
#define SPRD_GPIO_BANK_MASK GENMASK(15, 0)
#define SPRD_GPIO_BIT(x) ((x) & (SPRD_GPIO_BANK_NR - 1))
struct sprd_gpio {
struct gpio_chip chip;
void __iomem *base;
spinlock_t lock;
int irq;
};
static inline void __iomem *sprd_gpio_bank_base(struct sprd_gpio *sprd_gpio,
unsigned int bank)
{
return sprd_gpio->base + SPRD_GPIO_BANK_SIZE * bank;
}
static void sprd_gpio_update(struct gpio_chip *chip, unsigned int offset,
u16 reg, int val)
{
struct sprd_gpio *sprd_gpio = gpiochip_get_data(chip);
void __iomem *base = sprd_gpio_bank_base(sprd_gpio,
offset / SPRD_GPIO_BANK_NR);
unsigned long flags;
u32 tmp;
spin_lock_irqsave(&sprd_gpio->lock, flags);
tmp = readl_relaxed(base + reg);
if (val)
tmp |= BIT(SPRD_GPIO_BIT(offset));
else
tmp &= ~BIT(SPRD_GPIO_BIT(offset));
writel_relaxed(tmp, base + reg);
spin_unlock_irqrestore(&sprd_gpio->lock, flags);
}
static int sprd_gpio_read(struct gpio_chip *chip, unsigned int offset, u16 reg)
{
struct sprd_gpio *sprd_gpio = gpiochip_get_data(chip);
void __iomem *base = sprd_gpio_bank_base(sprd_gpio,
offset / SPRD_GPIO_BANK_NR);
return !!(readl_relaxed(base + reg) & BIT(SPRD_GPIO_BIT(offset)));
}
static int sprd_gpio_request(struct gpio_chip *chip, unsigned int offset)
{
sprd_gpio_update(chip, offset, SPRD_GPIO_DMSK, 1);
return 0;
}
static void sprd_gpio_free(struct gpio_chip *chip, unsigned int offset)
{
sprd_gpio_update(chip, offset, SPRD_GPIO_DMSK, 0);
}
static int sprd_gpio_direction_input(struct gpio_chip *chip,
unsigned int offset)
{
sprd_gpio_update(chip, offset, SPRD_GPIO_DIR, 0);
sprd_gpio_update(chip, offset, SPRD_GPIO_INEN, 1);
return 0;
}
static int sprd_gpio_direction_output(struct gpio_chip *chip,
unsigned int offset, int value)
{
sprd_gpio_update(chip, offset, SPRD_GPIO_DIR, 1);
sprd_gpio_update(chip, offset, SPRD_GPIO_INEN, 0);
sprd_gpio_update(chip, offset, SPRD_GPIO_DATA, value);
return 0;
}
static int sprd_gpio_get(struct gpio_chip *chip, unsigned int offset)
{
return sprd_gpio_read(chip, offset, SPRD_GPIO_DATA);
}
static void sprd_gpio_set(struct gpio_chip *chip, unsigned int offset,
int value)
{
sprd_gpio_update(chip, offset, SPRD_GPIO_DATA, value);
}
static void sprd_gpio_irq_mask(struct irq_data *data)
{
struct gpio_chip *chip = irq_data_get_irq_chip_data(data);
u32 offset = irqd_to_hwirq(data);
sprd_gpio_update(chip, offset, SPRD_GPIO_IE, 0);
}
static void sprd_gpio_irq_ack(struct irq_data *data)
{
struct gpio_chip *chip = irq_data_get_irq_chip_data(data);
u32 offset = irqd_to_hwirq(data);
sprd_gpio_update(chip, offset, SPRD_GPIO_IC, 1);
}
static void sprd_gpio_irq_unmask(struct irq_data *data)
{
struct gpio_chip *chip = irq_data_get_irq_chip_data(data);
u32 offset = irqd_to_hwirq(data);
sprd_gpio_update(chip, offset, SPRD_GPIO_IE, 1);
}
static int sprd_gpio_irq_set_type(struct irq_data *data,
unsigned int flow_type)
{
struct gpio_chip *chip = irq_data_get_irq_chip_data(data);
u32 offset = irqd_to_hwirq(data);
switch (flow_type) {
case IRQ_TYPE_EDGE_RISING:
sprd_gpio_update(chip, offset, SPRD_GPIO_IS, 0);
sprd_gpio_update(chip, offset, SPRD_GPIO_IBE, 0);
sprd_gpio_update(chip, offset, SPRD_GPIO_IEV, 1);
sprd_gpio_update(chip, offset, SPRD_GPIO_IC, 1);
irq_set_handler_locked(data, handle_edge_irq);
break;
case IRQ_TYPE_EDGE_FALLING:
sprd_gpio_update(chip, offset, SPRD_GPIO_IS, 0);
sprd_gpio_update(chip, offset, SPRD_GPIO_IBE, 0);
sprd_gpio_update(chip, offset, SPRD_GPIO_IEV, 0);
sprd_gpio_update(chip, offset, SPRD_GPIO_IC, 1);
irq_set_handler_locked(data, handle_edge_irq);
break;
case IRQ_TYPE_EDGE_BOTH:
sprd_gpio_update(chip, offset, SPRD_GPIO_IS, 0);
sprd_gpio_update(chip, offset, SPRD_GPIO_IBE, 1);
sprd_gpio_update(chip, offset, SPRD_GPIO_IC, 1);
irq_set_handler_locked(data, handle_edge_irq);
break;
case IRQ_TYPE_LEVEL_HIGH:
sprd_gpio_update(chip, offset, SPRD_GPIO_IS, 1);
sprd_gpio_update(chip, offset, SPRD_GPIO_IBE, 0);
sprd_gpio_update(chip, offset, SPRD_GPIO_IEV, 1);
irq_set_handler_locked(data, handle_level_irq);
break;
case IRQ_TYPE_LEVEL_LOW:
sprd_gpio_update(chip, offset, SPRD_GPIO_IS, 1);
sprd_gpio_update(chip, offset, SPRD_GPIO_IBE, 0);
sprd_gpio_update(chip, offset, SPRD_GPIO_IEV, 0);
irq_set_handler_locked(data, handle_level_irq);
break;
default:
return -EINVAL;
}
return 0;
}
static void sprd_gpio_irq_handler(struct irq_desc *desc)
{
struct gpio_chip *chip = irq_desc_get_handler_data(desc);
struct irq_chip *ic = irq_desc_get_chip(desc);
struct sprd_gpio *sprd_gpio = gpiochip_get_data(chip);
u32 bank, n, girq;
chained_irq_enter(ic, desc);
for (bank = 0; bank * SPRD_GPIO_BANK_NR < chip->ngpio; bank++) {
void __iomem *base = sprd_gpio_bank_base(sprd_gpio, bank);
unsigned long reg = readl_relaxed(base + SPRD_GPIO_MIS) &
SPRD_GPIO_BANK_MASK;
for_each_set_bit(n, &reg, SPRD_GPIO_BANK_NR) {
girq = irq_find_mapping(chip->irq.domain,
bank * SPRD_GPIO_BANK_NR + n);
generic_handle_irq(girq);
}
}
chained_irq_exit(ic, desc);
}
static struct irq_chip sprd_gpio_irqchip = {
.name = "sprd-gpio",
.irq_ack = sprd_gpio_irq_ack,
.irq_mask = sprd_gpio_irq_mask,
.irq_unmask = sprd_gpio_irq_unmask,
.irq_set_type = sprd_gpio_irq_set_type,
.flags = IRQCHIP_SKIP_SET_WAKE,
};
static int sprd_gpio_probe(struct platform_device *pdev)
{
struct gpio_irq_chip *irq;
struct sprd_gpio *sprd_gpio;
sprd_gpio = devm_kzalloc(&pdev->dev, sizeof(*sprd_gpio), GFP_KERNEL);
if (!sprd_gpio)
return -ENOMEM;
sprd_gpio->irq = platform_get_irq(pdev, 0);
if (sprd_gpio->irq < 0)
return sprd_gpio->irq;
sprd_gpio->base = devm_platform_ioremap_resource(pdev, 0);
if (IS_ERR(sprd_gpio->base))
return PTR_ERR(sprd_gpio->base);
spin_lock_init(&sprd_gpio->lock);
sprd_gpio->chip.label = dev_name(&pdev->dev);
sprd_gpio->chip.ngpio = SPRD_GPIO_NR;
sprd_gpio->chip.base = -1;
sprd_gpio->chip.parent = &pdev->dev;
sprd_gpio->chip.of_node = pdev->dev.of_node;
sprd_gpio->chip.request = sprd_gpio_request;
sprd_gpio->chip.free = sprd_gpio_free;
sprd_gpio->chip.get = sprd_gpio_get;
sprd_gpio->chip.set = sprd_gpio_set;
sprd_gpio->chip.direction_input = sprd_gpio_direction_input;
sprd_gpio->chip.direction_output = sprd_gpio_direction_output;
irq = &sprd_gpio->chip.irq;
irq->chip = &sprd_gpio_irqchip;
irq->handler = handle_bad_irq;
irq->default_type = IRQ_TYPE_NONE;
irq->parent_handler = sprd_gpio_irq_handler;
irq->parent_handler_data = sprd_gpio;
irq->num_parents = 1;
irq->parents = &sprd_gpio->irq;
return devm_gpiochip_add_data(&pdev->dev, &sprd_gpio->chip, sprd_gpio);
}
static const struct of_device_id sprd_gpio_of_match[] = {
{ .compatible = "sprd,sc9860-gpio", },
{ /* end of list */ }
};
MODULE_DEVICE_TABLE(of, sprd_gpio_of_match);
static struct platform_driver sprd_gpio_driver = {
.probe = sprd_gpio_probe,
.driver = {
.name = "sprd-gpio",
.of_match_table = sprd_gpio_of_match,
},
};
module_platform_driver_probe(sprd_gpio_driver, sprd_gpio_probe);
MODULE_DESCRIPTION("Spreadtrum GPIO driver");
MODULE_LICENSE("GPL v2");
Reference in New Issue View Git Blame Copy Permalink