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linux/drivers/gpio/gpio-vf610.c
Andy Shevchenko 448cf90513 gpio: Get rid of duplicate of_node assignment in the drivers 
GPIO library does copy the of_node from the parent device of
the GPIO chip, there is no need to repeat this in the individual
drivers. Remove these assignment all at once.

For the details one may look into the of_gpio_dev_init() implementation.

While at it, remove duplicate parent device assignment where it is the case.

Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Reviewed-By: Matti Vaittinen <matti.vaittinen@fi.rohmeurope.com>
Signed-off-by: Bartosz Golaszewski <brgl@bgdev.pl>
2021-12-17 17:39:35 +01:00

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// SPDX-License-Identifier: GPL-2.0+
/*
* Freescale vf610 GPIO support through PORT and GPIO
*
* Copyright (c) 2014 Toradex AG.
*
* Author: Stefan Agner <stefan@agner.ch>.
*/
#include <linux/bitops.h>
#include <linux/clk.h>
#include <linux/err.h>
#include <linux/gpio/driver.h>
#include <linux/init.h>
#include <linux/interrupt.h>
#include <linux/io.h>
#include <linux/ioport.h>
#include <linux/irq.h>
#include <linux/platform_device.h>
#include <linux/of.h>
#include <linux/of_device.h>
#include <linux/of_irq.h>
#define VF610_GPIO_PER_PORT 32
struct fsl_gpio_soc_data {
/* SoCs has a Port Data Direction Register (PDDR) */
bool have_paddr;
};
struct vf610_gpio_port {
struct gpio_chip gc;
struct irq_chip ic;
void __iomem *base;
void __iomem *gpio_base;
const struct fsl_gpio_soc_data *sdata;
u8 irqc[VF610_GPIO_PER_PORT];
struct clk *clk_port;
struct clk *clk_gpio;
int irq;
};
#define GPIO_PDOR 0x00
#define GPIO_PSOR 0x04
#define GPIO_PCOR 0x08
#define GPIO_PTOR 0x0c
#define GPIO_PDIR 0x10
#define GPIO_PDDR 0x14
#define PORT_PCR(n) ((n) * 0x4)
#define PORT_PCR_IRQC_OFFSET 16
#define PORT_ISFR 0xa0
#define PORT_DFER 0xc0
#define PORT_DFCR 0xc4
#define PORT_DFWR 0xc8
#define PORT_INT_OFF 0x0
#define PORT_INT_LOGIC_ZERO 0x8
#define PORT_INT_RISING_EDGE 0x9
#define PORT_INT_FALLING_EDGE 0xa
#define PORT_INT_EITHER_EDGE 0xb
#define PORT_INT_LOGIC_ONE 0xc
static const struct fsl_gpio_soc_data imx_data = {
.have_paddr = true,
};
static const struct of_device_id vf610_gpio_dt_ids[] = {
{ .compatible = "fsl,vf610-gpio", .data = NULL, },
{ .compatible = "fsl,imx7ulp-gpio", .data = &imx_data, },
{ /* sentinel */ }
};
static inline void vf610_gpio_writel(u32 val, void __iomem *reg)
{
writel_relaxed(val, reg);
}
static inline u32 vf610_gpio_readl(void __iomem *reg)
{
return readl_relaxed(reg);
}
static int vf610_gpio_get(struct gpio_chip *gc, unsigned int gpio)
{
struct vf610_gpio_port *port = gpiochip_get_data(gc);
unsigned long mask = BIT(gpio);
unsigned long offset = GPIO_PDIR;
if (port->sdata && port->sdata->have_paddr) {
mask &= vf610_gpio_readl(port->gpio_base + GPIO_PDDR);
if (mask)
offset = GPIO_PDOR;
}
return !!(vf610_gpio_readl(port->gpio_base + offset) & BIT(gpio));
}
static void vf610_gpio_set(struct gpio_chip *gc, unsigned int gpio, int val)
{
struct vf610_gpio_port *port = gpiochip_get_data(gc);
unsigned long mask = BIT(gpio);
unsigned long offset = val ? GPIO_PSOR : GPIO_PCOR;
vf610_gpio_writel(mask, port->gpio_base + offset);
}
static int vf610_gpio_direction_input(struct gpio_chip *chip, unsigned gpio)
{
struct vf610_gpio_port *port = gpiochip_get_data(chip);
unsigned long mask = BIT(gpio);
u32 val;
if (port->sdata && port->sdata->have_paddr) {
val = vf610_gpio_readl(port->gpio_base + GPIO_PDDR);
val &= ~mask;
vf610_gpio_writel(val, port->gpio_base + GPIO_PDDR);
}
return pinctrl_gpio_direction_input(chip->base + gpio);
}
static int vf610_gpio_direction_output(struct gpio_chip *chip, unsigned gpio,
int value)
{
struct vf610_gpio_port *port = gpiochip_get_data(chip);
unsigned long mask = BIT(gpio);
if (port->sdata && port->sdata->have_paddr)
vf610_gpio_writel(mask, port->gpio_base + GPIO_PDDR);
vf610_gpio_set(chip, gpio, value);
return pinctrl_gpio_direction_output(chip->base + gpio);
}
static void vf610_gpio_irq_handler(struct irq_desc *desc)
{
struct vf610_gpio_port *port =
gpiochip_get_data(irq_desc_get_handler_data(desc));
struct irq_chip *chip = irq_desc_get_chip(desc);
int pin;
unsigned long irq_isfr;
chained_irq_enter(chip, desc);
irq_isfr = vf610_gpio_readl(port->base + PORT_ISFR);
for_each_set_bit(pin, &irq_isfr, VF610_GPIO_PER_PORT) {
vf610_gpio_writel(BIT(pin), port->base + PORT_ISFR);
generic_handle_domain_irq(port->gc.irq.domain, pin);
}
chained_irq_exit(chip, desc);
}
static void vf610_gpio_irq_ack(struct irq_data *d)
{
struct vf610_gpio_port *port =
gpiochip_get_data(irq_data_get_irq_chip_data(d));
int gpio = d->hwirq;
vf610_gpio_writel(BIT(gpio), port->base + PORT_ISFR);
}
static int vf610_gpio_irq_set_type(struct irq_data *d, u32 type)
{
struct vf610_gpio_port *port =
gpiochip_get_data(irq_data_get_irq_chip_data(d));
u8 irqc;
switch (type) {
case IRQ_TYPE_EDGE_RISING:
irqc = PORT_INT_RISING_EDGE;
break;
case IRQ_TYPE_EDGE_FALLING:
irqc = PORT_INT_FALLING_EDGE;
break;
case IRQ_TYPE_EDGE_BOTH:
irqc = PORT_INT_EITHER_EDGE;
break;
case IRQ_TYPE_LEVEL_LOW:
irqc = PORT_INT_LOGIC_ZERO;
break;
case IRQ_TYPE_LEVEL_HIGH:
irqc = PORT_INT_LOGIC_ONE;
break;
default:
return -EINVAL;
}
port->irqc[d->hwirq] = irqc;
if (type & IRQ_TYPE_LEVEL_MASK)
irq_set_handler_locked(d, handle_level_irq);
else
irq_set_handler_locked(d, handle_edge_irq);
return 0;
}
static void vf610_gpio_irq_mask(struct irq_data *d)
{
struct vf610_gpio_port *port =
gpiochip_get_data(irq_data_get_irq_chip_data(d));
void __iomem *pcr_base = port->base + PORT_PCR(d->hwirq);
vf610_gpio_writel(0, pcr_base);
}
static void vf610_gpio_irq_unmask(struct irq_data *d)
{
struct vf610_gpio_port *port =
gpiochip_get_data(irq_data_get_irq_chip_data(d));
void __iomem *pcr_base = port->base + PORT_PCR(d->hwirq);
vf610_gpio_writel(port->irqc[d->hwirq] << PORT_PCR_IRQC_OFFSET,
pcr_base);
}
static int vf610_gpio_irq_set_wake(struct irq_data *d, u32 enable)
{
struct vf610_gpio_port *port =
gpiochip_get_data(irq_data_get_irq_chip_data(d));
if (enable)
enable_irq_wake(port->irq);
else
disable_irq_wake(port->irq);
return 0;
}
static void vf610_gpio_disable_clk(void *data)
{
clk_disable_unprepare(data);
}
static int vf610_gpio_probe(struct platform_device *pdev)
{
struct device *dev = &pdev->dev;
struct device_node *np = dev->of_node;
struct vf610_gpio_port *port;
struct gpio_chip *gc;
struct gpio_irq_chip *girq;
struct irq_chip *ic;
int i;
int ret;
port = devm_kzalloc(dev, sizeof(*port), GFP_KERNEL);
if (!port)
return -ENOMEM;
port->sdata = of_device_get_match_data(dev);
port->base = devm_platform_ioremap_resource(pdev, 0);
if (IS_ERR(port->base))
return PTR_ERR(port->base);
port->gpio_base = devm_platform_ioremap_resource(pdev, 1);
if (IS_ERR(port->gpio_base))
return PTR_ERR(port->gpio_base);
port->irq = platform_get_irq(pdev, 0);
if (port->irq < 0)
return port->irq;
port->clk_port = devm_clk_get(dev, "port");
ret = PTR_ERR_OR_ZERO(port->clk_port);
if (!ret) {
ret = clk_prepare_enable(port->clk_port);
if (ret)
return ret;
ret = devm_add_action_or_reset(dev, vf610_gpio_disable_clk,
port->clk_port);
if (ret)
return ret;
} else if (ret == -EPROBE_DEFER) {
/*
* Percolate deferrals, for anything else,
* just live without the clocking.
*/
return ret;
}
port->clk_gpio = devm_clk_get(dev, "gpio");
ret = PTR_ERR_OR_ZERO(port->clk_gpio);
if (!ret) {
ret = clk_prepare_enable(port->clk_gpio);
if (ret)
return ret;
ret = devm_add_action_or_reset(dev, vf610_gpio_disable_clk,
port->clk_gpio);
if (ret)
return ret;
} else if (ret == -EPROBE_DEFER) {
return ret;
}
gc = &port->gc;
gc->parent = dev;
gc->label = "vf610-gpio";
gc->ngpio = VF610_GPIO_PER_PORT;
gc->base = of_alias_get_id(np, "gpio") * VF610_GPIO_PER_PORT;
gc->request = gpiochip_generic_request;
gc->free = gpiochip_generic_free;
gc->direction_input = vf610_gpio_direction_input;
gc->get = vf610_gpio_get;
gc->direction_output = vf610_gpio_direction_output;
gc->set = vf610_gpio_set;
ic = &port->ic;
ic->name = "gpio-vf610";
ic->irq_ack = vf610_gpio_irq_ack;
ic->irq_mask = vf610_gpio_irq_mask;
ic->irq_unmask = vf610_gpio_irq_unmask;
ic->irq_set_type = vf610_gpio_irq_set_type;
ic->irq_set_wake = vf610_gpio_irq_set_wake;
/* Mask all GPIO interrupts */
for (i = 0; i < gc->ngpio; i++)
vf610_gpio_writel(0, port->base + PORT_PCR(i));
/* Clear the interrupt status register for all GPIO's */
vf610_gpio_writel(~0, port->base + PORT_ISFR);
girq = &gc->irq;
girq->chip = ic;
girq->parent_handler = vf610_gpio_irq_handler;
girq->num_parents = 1;
girq->parents = devm_kcalloc(&pdev->dev, 1,
sizeof(*girq->parents),
GFP_KERNEL);
if (!girq->parents)
return -ENOMEM;
girq->parents[0] = port->irq;
girq->default_type = IRQ_TYPE_NONE;
girq->handler = handle_edge_irq;
return devm_gpiochip_add_data(dev, gc, port);
}
static struct platform_driver vf610_gpio_driver = {
.driver = {
.name = "gpio-vf610",
.of_match_table = vf610_gpio_dt_ids,
},
.probe = vf610_gpio_probe,
};
builtin_platform_driver(vf610_gpio_driver);
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