mirror of
https://github.com/edk2-porting/linux-next.git
synced 2024-12-15 16:53:54 +08:00
gpio: new driver to work with a 8x12 siox
This driver controls a SIOX device that provides 20 I/O lines. The first twelve are fixed inputs, the remaining eight are outputs. Acked-by: Gavin Schenk <g.schenk@eckelmann.de> Signed-off-by: Uwe Kleine-König <u.kleine-koenig@pengutronix.de> Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
This commit is contained in:
Uwe Kleine-König
Linus Walleij
parent
9aa64f0be3
commit
be8c8facc7
@ -13289,6 +13289,7 @@ M: Uwe Kleine-König <u.kleine-koenig@pengutronix.de>
|
||||
R: Pengutronix Kernel Team <kernel@pengutronix.de>
|
||||
S: Supported
|
||||
F: drivers/siox/*
|
||||
F: drivers/gpio/gpio-siox.c
|
||||
F: include/trace/events/siox.h
|
||||
|
||||
SIS 190 ETHERNET DRIVER
|
||||
|
||||
@ -429,6 +429,14 @@ config GPIO_REG
|
||||
A 32-bit single register GPIO fixed in/out implementation. This
|
||||
can be used to represent any register as a set of GPIO signals.
|
||||
|
||||
config GPIO_SIOX
|
||||
tristate "SIOX GPIO support"
|
||||
depends on SIOX
|
||||
select GPIOLIB_IRQCHIP
|
||||
help
|
||||
Say yes here to support SIOX I/O devices. These are units connected
|
||||
via a SIOX bus and have a number of fixed-direction I/O lines.
|
||||
|
||||
config GPIO_SPEAR_SPICS
|
||||
bool "ST SPEAr13xx SPI Chip Select as GPIO support"
|
||||
depends on PLAT_SPEAR
|
||||
|
||||
@ -124,6 +124,7 @@ obj-$(CONFIG_GPIO_TEGRA186) += gpio-tegra186.o
|
||||
obj-$(CONFIG_GPIO_THUNDERX) += gpio-thunderx.o
|
||||
obj-$(CONFIG_GPIO_TIMBERDALE) += gpio-timberdale.o
|
||||
obj-$(CONFIG_GPIO_PALMAS) += gpio-palmas.o
|
||||
obj-$(CONFIG_GPIO_SIOX) += gpio-siox.o
|
||||
obj-$(CONFIG_GPIO_TPIC2810) += gpio-tpic2810.o
|
||||
obj-$(CONFIG_GPIO_TPS65086) += gpio-tps65086.o
|
||||
obj-$(CONFIG_GPIO_TPS65218) += gpio-tps65218.o
|
||||
|
||||
293
drivers/gpio/gpio-siox.c
Normal file
293
drivers/gpio/gpio-siox.c
Normal file
@ -0,0 +1,293 @@
|
||||
// SPDX-License-Identifier: GPL-2.0
|
||||
/*
|
||||
* Copyright (C) 2015-2018 Pengutronix, Uwe Kleine-König <kernel@pengutronix.de>
|
||||
*/
|
||||
|
||||
#include <linux/module.h>
|
||||
#include <linux/siox.h>
|
||||
#include <linux/gpio/driver.h>
|
||||
#include <linux/of.h>
|
||||
|
||||
struct gpio_siox_ddata {
|
||||
struct gpio_chip gchip;
|
||||
struct irq_chip ichip;
|
||||
struct mutex lock;
|
||||
u8 setdata[1];
|
||||
u8 getdata[3];
|
||||
|
||||
spinlock_t irqlock;
|
||||
u32 irq_enable;
|
||||
u32 irq_status;
|
||||
u32 irq_type[20];
|
||||
};
|
||||
|
||||
/*
|
||||
* Note that this callback only sets the value that is clocked out in the next
|
||||
* cycle.
|
||||
*/
|
||||
static int gpio_siox_set_data(struct siox_device *sdevice, u8 status, u8 buf[])
|
||||
{
|
||||
struct gpio_siox_ddata *ddata = dev_get_drvdata(&sdevice->dev);
|
||||
|
||||
mutex_lock(&ddata->lock);
|
||||
buf[0] = ddata->setdata[0];
|
||||
mutex_unlock(&ddata->lock);
|
||||
|
||||
return 0;
|
||||
}
|
||||
|
||||
static int gpio_siox_get_data(struct siox_device *sdevice, const u8 buf[])
|
||||
{
|
||||
struct gpio_siox_ddata *ddata = dev_get_drvdata(&sdevice->dev);
|
||||
size_t offset;
|
||||
u32 trigger;
|
||||
|
||||
mutex_lock(&ddata->lock);
|
||||
|
||||
spin_lock_irq(&ddata->irqlock);
|
||||
|
||||
for (offset = 0; offset < 12; ++offset) {
|
||||
unsigned int bitpos = 11 - offset;
|
||||
unsigned int gpiolevel = buf[bitpos / 8] & (1 << bitpos % 8);
|
||||
unsigned int prev_level =
|
||||
ddata->getdata[bitpos / 8] & (1 << (bitpos % 8));
|
||||
u32 irq_type = ddata->irq_type[offset];
|
||||
|
||||
if (gpiolevel) {
|
||||
if ((irq_type & IRQ_TYPE_LEVEL_HIGH) ||
|
||||
((irq_type & IRQ_TYPE_EDGE_RISING) && !prev_level))
|
||||
ddata->irq_status |= 1 << offset;
|
||||
} else {
|
||||
if ((irq_type & IRQ_TYPE_LEVEL_LOW) ||
|
||||
((irq_type & IRQ_TYPE_EDGE_FALLING) && prev_level))
|
||||
ddata->irq_status |= 1 << offset;
|
||||
}
|
||||
}
|
||||
|
||||
trigger = ddata->irq_status & ddata->irq_enable;
|
||||
|
||||
spin_unlock_irq(&ddata->irqlock);
|
||||
|
||||
ddata->getdata[0] = buf[0];
|
||||
ddata->getdata[1] = buf[1];
|
||||
ddata->getdata[2] = buf[2];
|
||||
|
||||
mutex_unlock(&ddata->lock);
|
||||
|
||||
for (offset = 0; offset < 12; ++offset) {
|
||||
if (trigger & (1 << offset)) {
|
||||
struct irq_domain *irqdomain = ddata->gchip.irq.domain;
|
||||
unsigned int irq = irq_find_mapping(irqdomain, offset);
|
||||
|
||||
/*
|
||||
* Conceptually handle_nested_irq should call the flow
|
||||
* handler of the irq chip. But it doesn't, so we have
|
||||
* to clean the irq_status here.
|
||||
*/
|
||||
spin_lock_irq(&ddata->irqlock);
|
||||
ddata->irq_status &= ~(1 << offset);
|
||||
spin_unlock_irq(&ddata->irqlock);
|
||||
|
||||
handle_nested_irq(irq);
|
||||
}
|
||||
}
|
||||
|
||||
return 0;
|
||||
}
|
||||
|
||||
static void gpio_siox_irq_ack(struct irq_data *d)
|
||||
{
|
||||
struct irq_chip *ic = irq_data_get_irq_chip(d);
|
||||
struct gpio_siox_ddata *ddata =
|
||||
container_of(ic, struct gpio_siox_ddata, ichip);
|
||||
|
||||
spin_lock_irq(&ddata->irqlock);
|
||||
ddata->irq_status &= ~(1 << d->hwirq);
|
||||
spin_unlock_irq(&ddata->irqlock);
|
||||
}
|
||||
|
||||
static void gpio_siox_irq_mask(struct irq_data *d)
|
||||
{
|
||||
struct irq_chip *ic = irq_data_get_irq_chip(d);
|
||||
struct gpio_siox_ddata *ddata =
|
||||
container_of(ic, struct gpio_siox_ddata, ichip);
|
||||
|
||||
spin_lock_irq(&ddata->irqlock);
|
||||
ddata->irq_enable &= ~(1 << d->hwirq);
|
||||
spin_unlock_irq(&ddata->irqlock);
|
||||
}
|
||||
|
||||
static void gpio_siox_irq_unmask(struct irq_data *d)
|
||||
{
|
||||
struct irq_chip *ic = irq_data_get_irq_chip(d);
|
||||
struct gpio_siox_ddata *ddata =
|
||||
container_of(ic, struct gpio_siox_ddata, ichip);
|
||||
|
||||
spin_lock_irq(&ddata->irqlock);
|
||||
ddata->irq_enable |= 1 << d->hwirq;
|
||||
spin_unlock_irq(&ddata->irqlock);
|
||||
}
|
||||
|
||||
static int gpio_siox_irq_set_type(struct irq_data *d, u32 type)
|
||||
{
|
||||
struct irq_chip *ic = irq_data_get_irq_chip(d);
|
||||
struct gpio_siox_ddata *ddata =
|
||||
container_of(ic, struct gpio_siox_ddata, ichip);
|
||||
|
||||
spin_lock_irq(&ddata->irqlock);
|
||||
ddata->irq_type[d->hwirq] = type;
|
||||
spin_unlock_irq(&ddata->irqlock);
|
||||
|
||||
return 0;
|
||||
}
|
||||
|
||||
static int gpio_siox_get(struct gpio_chip *chip, unsigned int offset)
|
||||
{
|
||||
struct gpio_siox_ddata *ddata =
|
||||
container_of(chip, struct gpio_siox_ddata, gchip);
|
||||
int ret;
|
||||
|
||||
mutex_lock(&ddata->lock);
|
||||
|
||||
if (offset >= 12) {
|
||||
unsigned int bitpos = 19 - offset;
|
||||
|
||||
ret = ddata->setdata[0] & (1 << bitpos);
|
||||
} else {
|
||||
unsigned int bitpos = 11 - offset;
|
||||
|
||||
ret = ddata->getdata[bitpos / 8] & (1 << (bitpos % 8));
|
||||
}
|
||||
|
||||
mutex_unlock(&ddata->lock);
|
||||
|
||||
return ret;
|
||||
}
|
||||
|
||||
static void gpio_siox_set(struct gpio_chip *chip,
|
||||
unsigned int offset, int value)
|
||||
{
|
||||
struct gpio_siox_ddata *ddata =
|
||||
container_of(chip, struct gpio_siox_ddata, gchip);
|
||||
u8 mask = 1 << (19 - offset);
|
||||
|
||||
mutex_lock(&ddata->lock);
|
||||
|
||||
if (value)
|
||||
ddata->setdata[0] |= mask;
|
||||
else
|
||||
ddata->setdata[0] &= ~mask;
|
||||
|
||||
mutex_unlock(&ddata->lock);
|
||||
}
|
||||
|
||||
static int gpio_siox_direction_input(struct gpio_chip *chip,
|
||||
unsigned int offset)
|
||||
{
|
||||
if (offset >= 12)
|
||||
return -EINVAL;
|
||||
|
||||
return 0;
|
||||
}
|
||||
|
||||
static int gpio_siox_direction_output(struct gpio_chip *chip,
|
||||
unsigned int offset, int value)
|
||||
{
|
||||
if (offset < 12)
|
||||
return -EINVAL;
|
||||
|
||||
gpio_siox_set(chip, offset, value);
|
||||
return 0;
|
||||
}
|
||||
|
||||
static int gpio_siox_get_direction(struct gpio_chip *chip, unsigned int offset)
|
||||
{
|
||||
if (offset < 12)
|
||||
return 1; /* input */
|
||||
else
|
||||
return 0; /* output */
|
||||
}
|
||||
|
||||
static int gpio_siox_probe(struct siox_device *sdevice)
|
||||
{
|
||||
struct gpio_siox_ddata *ddata;
|
||||
int ret;
|
||||
|
||||
ddata = devm_kzalloc(&sdevice->dev, sizeof(*ddata), GFP_KERNEL);
|
||||
if (!ddata)
|
||||
return -ENOMEM;
|
||||
|
||||
dev_set_drvdata(&sdevice->dev, ddata);
|
||||
|
||||
mutex_init(&ddata->lock);
|
||||
spin_lock_init(&ddata->irqlock);
|
||||
|
||||
ddata->gchip.base = -1;
|
||||
ddata->gchip.can_sleep = 1;
|
||||
ddata->gchip.parent = &sdevice->dev;
|
||||
ddata->gchip.owner = THIS_MODULE;
|
||||
ddata->gchip.get = gpio_siox_get;
|
||||
ddata->gchip.set = gpio_siox_set;
|
||||
ddata->gchip.direction_input = gpio_siox_direction_input;
|
||||
ddata->gchip.direction_output = gpio_siox_direction_output;
|
||||
ddata->gchip.get_direction = gpio_siox_get_direction;
|
||||
ddata->gchip.ngpio = 20;
|
||||
|
||||
ddata->ichip.name = "siox-gpio";
|
||||
ddata->ichip.irq_ack = gpio_siox_irq_ack;
|
||||
ddata->ichip.irq_mask = gpio_siox_irq_mask;
|
||||
ddata->ichip.irq_unmask = gpio_siox_irq_unmask;
|
||||
ddata->ichip.irq_set_type = gpio_siox_irq_set_type;
|
||||
|
||||
ret = gpiochip_add(&ddata->gchip);
|
||||
if (ret) {
|
||||
dev_err(&sdevice->dev,
|
||||
"Failed to register gpio chip (%d)\n", ret);
|
||||
goto err_gpiochip;
|
||||
}
|
||||
|
||||
ret = gpiochip_irqchip_add(&ddata->gchip, &ddata->ichip,
|
||||
0, handle_level_irq, IRQ_TYPE_EDGE_RISING);
|
||||
if (ret) {
|
||||
dev_err(&sdevice->dev,
|
||||
"Failed to register irq chip (%d)\n", ret);
|
||||
err_gpiochip:
|
||||
gpiochip_remove(&ddata->gchip);
|
||||
}
|
||||
|
||||
return ret;
|
||||
}
|
||||
|
||||
static int gpio_siox_remove(struct siox_device *sdevice)
|
||||
{
|
||||
struct gpio_siox_ddata *ddata = dev_get_drvdata(&sdevice->dev);
|
||||
|
||||
gpiochip_remove(&ddata->gchip);
|
||||
return 0;
|
||||
}
|
||||
|
||||
static struct siox_driver gpio_siox_driver = {
|
||||
.probe = gpio_siox_probe,
|
||||
.remove = gpio_siox_remove,
|
||||
.set_data = gpio_siox_set_data,
|
||||
.get_data = gpio_siox_get_data,
|
||||
.driver = {
|
||||
.name = "gpio-siox",
|
||||
},
|
||||
};
|
||||
|
||||
static int __init gpio_siox_init(void)
|
||||
{
|
||||
return siox_driver_register(&gpio_siox_driver);
|
||||
}
|
||||
module_init(gpio_siox_init);
|
||||
|
||||
static void __exit gpio_siox_exit(void)
|
||||
{
|
||||
siox_driver_unregister(&gpio_siox_driver);
|
||||
}
|
||||
module_exit(gpio_siox_exit);
|
||||
|
||||
MODULE_AUTHOR("Uwe Kleine-Koenig <u.kleine-koenig@pengutronix.de>");
|
||||
MODULE_DESCRIPTION("SIOX gpio driver");
|
||||
MODULE_LICENSE("GPL v2");
|
||||
Loading…
Reference in New Issue
Block a user