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gpio: Add gpio-ingenic driver

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This driver handles the GPIOs of all the Ingenic JZ47xx SoCs
currently supported by the upsteam Linux kernel.

Signed-off-by: Paul Cercueil <paul@crapouillou.net>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
This commit is contained in:
Paul Cercueil 2017-05-12 18:52:57 +02:00 committed by Linus Walleij
parent b5c23aa465
commit b0653ce39a
3 changed files with 405 additions and 0 deletions
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10
drivers/gpio/Kconfig
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@ -242,6 +242,16 @@ config GPIO_ICH
If unsure, say N.
config GPIO_INGENIC
tristate "Ingenic JZ47xx SoCs GPIO support"
depends on MACH_INGENIC || COMPILE_TEST
select GPIOLIB_IRQCHIP
help
Say yes here to support the GPIO functionality present on the
JZ4740 and JZ4780 SoCs from Ingenic.
If unsure, say N.
config GPIO_IOP
tristate "Intel IOP GPIO"
depends on ARCH_IOP32X || ARCH_IOP33X || COMPILE_TEST

1
drivers/gpio/Makefile
View File

@ -55,6 +55,7 @@ obj-$(CONFIG_GPIO_GPIO_MM) += gpio-gpio-mm.o
obj-$(CONFIG_GPIO_GRGPIO) += gpio-grgpio.o
obj-$(CONFIG_HTC_EGPIO) += gpio-htc-egpio.o
obj-$(CONFIG_GPIO_ICH) += gpio-ich.o
obj-$(CONFIG_GPIO_INGENIC) += gpio-ingenic.o
obj-$(CONFIG_GPIO_IOP) += gpio-iop.o
obj-$(CONFIG_GPIO_IT87) += gpio-it87.o
obj-$(CONFIG_GPIO_JANZ_TTL) += gpio-janz-ttl.o

394
drivers/gpio/gpio-ingenic.c Normal file
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@ -0,0 +1,394 @@
/*
* Ingenic JZ47xx GPIO driver
*
* Copyright (c) 2017 Paul Cercueil <paul@crapouillou.net>
*
* License terms: GNU General Public License (GPL) version 2
*/
#include <linux/gpio/driver.h>
#include <linux/interrupt.h>
#include <linux/io.h>
#include <linux/module.h>
#include <linux/of_address.h>
#include <linux/of_device.h>
#include <linux/of_irq.h>
#include <linux/pinctrl/consumer.h>
#include <linux/regmap.h>
#define GPIO_PIN 0x00
#define GPIO_MSK 0x20
#define JZ4740_GPIO_DATA 0x10
#define JZ4740_GPIO_SELECT 0x50
#define JZ4740_GPIO_DIR 0x60
#define JZ4740_GPIO_TRIG 0x70
#define JZ4740_GPIO_FLAG 0x80
#define JZ4770_GPIO_INT 0x10
#define JZ4770_GPIO_PAT1 0x30
#define JZ4770_GPIO_PAT0 0x40
#define JZ4770_GPIO_FLAG 0x50
#define REG_SET(x) ((x) + 0x4)
#define REG_CLEAR(x) ((x) + 0x8)
enum jz_version {
ID_JZ4740,
ID_JZ4770,
ID_JZ4780,
};
struct ingenic_gpio_chip {
struct regmap *map;
struct gpio_chip gc;
struct irq_chip irq_chip;
unsigned int irq, reg_base;
enum jz_version version;
};
static u32 gpio_ingenic_read_reg(struct ingenic_gpio_chip *jzgc, u8 reg)
{
unsigned int val;
regmap_read(jzgc->map, jzgc->reg_base + reg, &val);
return (u32) val;
}
static void gpio_ingenic_set_bit(struct ingenic_gpio_chip *jzgc,
u8 reg, u8 offset, bool set)
{
if (set)
reg = REG_SET(reg);
else
reg = REG_CLEAR(reg);
regmap_write(jzgc->map, jzgc->reg_base + reg, BIT(offset));
}
static inline bool gpio_get_value(struct ingenic_gpio_chip *jzgc, u8 offset)
{
unsigned int val = gpio_ingenic_read_reg(jzgc, GPIO_PIN);
return !!(val & BIT(offset));
}
static void gpio_set_value(struct ingenic_gpio_chip *jzgc, u8 offset, int value)
{
if (jzgc->version >= ID_JZ4770)
gpio_ingenic_set_bit(jzgc, JZ4770_GPIO_PAT0, offset, !!value);
else
gpio_ingenic_set_bit(jzgc, JZ4740_GPIO_DATA, offset, !!value);
}
static void irq_set_type(struct ingenic_gpio_chip *jzgc,
u8 offset, unsigned int type)
{
u8 reg1, reg2;
if (jzgc->version >= ID_JZ4770) {
reg1 = JZ4770_GPIO_PAT1;
reg2 = JZ4770_GPIO_PAT0;
} else {
reg1 = JZ4740_GPIO_TRIG;
reg2 = JZ4740_GPIO_DIR;
}
switch (type) {
case IRQ_TYPE_EDGE_RISING:
gpio_ingenic_set_bit(jzgc, reg2, offset, true);
gpio_ingenic_set_bit(jzgc, reg1, offset, true);
break;
case IRQ_TYPE_EDGE_FALLING:
gpio_ingenic_set_bit(jzgc, reg2, offset, false);
gpio_ingenic_set_bit(jzgc, reg1, offset, true);
break;
case IRQ_TYPE_LEVEL_HIGH:
gpio_ingenic_set_bit(jzgc, reg2, offset, true);
gpio_ingenic_set_bit(jzgc, reg1, offset, false);
break;
case IRQ_TYPE_LEVEL_LOW:
default:
gpio_ingenic_set_bit(jzgc, reg2, offset, false);
gpio_ingenic_set_bit(jzgc, reg1, offset, false);
break;
}
}
static void ingenic_gpio_irq_mask(struct irq_data *irqd)
{
struct gpio_chip *gc = irq_data_get_irq_chip_data(irqd);
struct ingenic_gpio_chip *jzgc = gpiochip_get_data(gc);
gpio_ingenic_set_bit(jzgc, GPIO_MSK, irqd->hwirq, true);
}
static void ingenic_gpio_irq_unmask(struct irq_data *irqd)
{
struct gpio_chip *gc = irq_data_get_irq_chip_data(irqd);
struct ingenic_gpio_chip *jzgc = gpiochip_get_data(gc);
gpio_ingenic_set_bit(jzgc, GPIO_MSK, irqd->hwirq, false);
}
static void ingenic_gpio_irq_enable(struct irq_data *irqd)
{
struct gpio_chip *gc = irq_data_get_irq_chip_data(irqd);
struct ingenic_gpio_chip *jzgc = gpiochip_get_data(gc);
int irq = irqd->hwirq;
if (jzgc->version >= ID_JZ4770)
gpio_ingenic_set_bit(jzgc, JZ4770_GPIO_INT, irq, true);
else
gpio_ingenic_set_bit(jzgc, JZ4740_GPIO_SELECT, irq, true);
ingenic_gpio_irq_unmask(irqd);
}
static void ingenic_gpio_irq_disable(struct irq_data *irqd)
{
struct gpio_chip *gc = irq_data_get_irq_chip_data(irqd);
struct ingenic_gpio_chip *jzgc = gpiochip_get_data(gc);
int irq = irqd->hwirq;
ingenic_gpio_irq_mask(irqd);
if (jzgc->version >= ID_JZ4770)
gpio_ingenic_set_bit(jzgc, JZ4770_GPIO_INT, irq, false);
else
gpio_ingenic_set_bit(jzgc, JZ4740_GPIO_SELECT, irq, false);
}
static void ingenic_gpio_irq_ack(struct irq_data *irqd)
{
struct gpio_chip *gc = irq_data_get_irq_chip_data(irqd);
struct ingenic_gpio_chip *jzgc = gpiochip_get_data(gc);
int irq = irqd->hwirq;
bool high;
if (irqd_get_trigger_type(irqd) == IRQ_TYPE_EDGE_BOTH) {
/*
* Switch to an interrupt for the opposite edge to the one that
* triggered the interrupt being ACKed.
*/
high = gpio_get_value(jzgc, irq);
if (high)
irq_set_type(jzgc, irq, IRQ_TYPE_EDGE_FALLING);
else
irq_set_type(jzgc, irq, IRQ_TYPE_EDGE_RISING);
}
if (jzgc->version >= ID_JZ4770)
gpio_ingenic_set_bit(jzgc, JZ4770_GPIO_FLAG, irq, false);
else
gpio_ingenic_set_bit(jzgc, JZ4740_GPIO_DATA, irq, true);
}
static int ingenic_gpio_irq_set_type(struct irq_data *irqd, unsigned int type)
{
struct gpio_chip *gc = irq_data_get_irq_chip_data(irqd);
struct ingenic_gpio_chip *jzgc = gpiochip_get_data(gc);
switch (type) {
case IRQ_TYPE_EDGE_BOTH:
case IRQ_TYPE_EDGE_RISING:
case IRQ_TYPE_EDGE_FALLING:
irq_set_handler_locked(irqd, handle_edge_irq);
break;
case IRQ_TYPE_LEVEL_HIGH:
case IRQ_TYPE_LEVEL_LOW:
irq_set_handler_locked(irqd, handle_level_irq);
break;
default:
irq_set_handler_locked(irqd, handle_bad_irq);
}
if (type == IRQ_TYPE_EDGE_BOTH) {
/*
* The hardware does not support interrupts on both edges. The
* best we can do is to set up a single-edge interrupt and then
* switch to the opposing edge when ACKing the interrupt.
*/
bool high = gpio_get_value(jzgc, irqd->hwirq);
type = high ? IRQ_TYPE_EDGE_FALLING : IRQ_TYPE_EDGE_RISING;
}
irq_set_type(jzgc, irqd->hwirq, type);
return 0;
}
static int ingenic_gpio_irq_set_wake(struct irq_data *irqd, unsigned int on)
{
struct gpio_chip *gc = irq_data_get_irq_chip_data(irqd);
struct ingenic_gpio_chip *jzgc = gpiochip_get_data(gc);
return irq_set_irq_wake(jzgc->irq, on);
}
static void ingenic_gpio_irq_handler(struct irq_desc *desc)
{
struct gpio_chip *gc = irq_desc_get_handler_data(desc);
struct ingenic_gpio_chip *jzgc = gpiochip_get_data(gc);
struct irq_chip *irq_chip = irq_data_get_irq_chip(&desc->irq_data);
unsigned long flag, i;
chained_irq_enter(irq_chip, desc);
if (jzgc->version >= ID_JZ4770)
flag = gpio_ingenic_read_reg(jzgc, JZ4770_GPIO_FLAG);
else
flag = gpio_ingenic_read_reg(jzgc, JZ4740_GPIO_FLAG);
for_each_set_bit(i, &flag, 32)
generic_handle_irq(irq_linear_revmap(gc->irqdomain, i));
chained_irq_exit(irq_chip, desc);
}
static void ingenic_gpio_set(struct gpio_chip *gc,
unsigned int offset, int value)
{
struct ingenic_gpio_chip *jzgc = gpiochip_get_data(gc);
gpio_set_value(jzgc, offset, value);
}
static int ingenic_gpio_get(struct gpio_chip *gc, unsigned int offset)
{
struct ingenic_gpio_chip *jzgc = gpiochip_get_data(gc);
return (int) gpio_get_value(jzgc, offset);
}
static int ingenic_gpio_direction_input(struct gpio_chip *gc,
unsigned int offset)
{
return pinctrl_gpio_direction_input(gc->base + offset);
}
static int ingenic_gpio_direction_output(struct gpio_chip *gc,
unsigned int offset, int value)
{
ingenic_gpio_set(gc, offset, value);
return pinctrl_gpio_direction_output(gc->base + offset);
}
static const struct of_device_id ingenic_gpio_of_match[] = {
{ .compatible = "ingenic,jz4740-gpio", .data = (void *)ID_JZ4740 },
{ .compatible = "ingenic,jz4770-gpio", .data = (void *)ID_JZ4770 },
{ .compatible = "ingenic,jz4780-gpio", .data = (void *)ID_JZ4780 },
{},
};
MODULE_DEVICE_TABLE(of, ingenic_gpio_of_match);
static int ingenic_gpio_probe(struct platform_device *pdev)
{
struct device *dev = &pdev->dev;
const struct of_device_id *of_id = of_match_device(
ingenic_gpio_of_match, dev);
struct ingenic_gpio_chip *jzgc;
u32 bank;
int err;
jzgc = devm_kzalloc(dev, sizeof(*jzgc), GFP_KERNEL);
if (!jzgc)
return -ENOMEM;
jzgc->map = dev_get_drvdata(dev->parent);
if (!jzgc->map) {
dev_err(dev, "Cannot get parent regmap\n");
return -ENXIO;
}
err = of_property_read_u32(dev->of_node, "reg", &bank);
if (err) {
dev_err(dev, "Cannot read \"reg\" property: %i\n", err);
return err;
}
jzgc->reg_base = bank * 0x100;
jzgc->gc.label = devm_kasprintf(dev, GFP_KERNEL, "GPIO%c", 'A' + bank);
if (!jzgc->gc.label)
return -ENOMEM;
/* DO NOT EXPAND THIS: FOR BACKWARD GPIO NUMBERSPACE COMPATIBIBILITY
* ONLY: WORK TO TRANSITION CONSUMERS TO USE THE GPIO DESCRIPTOR API IN
* <linux/gpio/consumer.h> INSTEAD.
*/
jzgc->gc.base = bank * 32;
jzgc->gc.ngpio = 32;
jzgc->gc.parent = dev;
jzgc->gc.of_node = dev->of_node;
jzgc->gc.owner = THIS_MODULE;
jzgc->version = (enum jz_version)of_id->data;
jzgc->gc.set = ingenic_gpio_set;
jzgc->gc.get = ingenic_gpio_get;
jzgc->gc.direction_input = ingenic_gpio_direction_input;
jzgc->gc.direction_output = ingenic_gpio_direction_output;
if (of_property_read_bool(dev->of_node, "gpio-ranges")) {
jzgc->gc.request = gpiochip_generic_request;
jzgc->gc.free = gpiochip_generic_free;
}
err = devm_gpiochip_add_data(dev, &jzgc->gc, jzgc);
if (err)
return err;
jzgc->irq = irq_of_parse_and_map(dev->of_node, 0);
if (!jzgc->irq)
return -EINVAL;
jzgc->irq_chip.name = jzgc->gc.label;
jzgc->irq_chip.irq_enable = ingenic_gpio_irq_enable;
jzgc->irq_chip.irq_disable = ingenic_gpio_irq_disable;
jzgc->irq_chip.irq_unmask = ingenic_gpio_irq_unmask;
jzgc->irq_chip.irq_mask = ingenic_gpio_irq_mask;
jzgc->irq_chip.irq_ack = ingenic_gpio_irq_ack;
jzgc->irq_chip.irq_set_type = ingenic_gpio_irq_set_type;
jzgc->irq_chip.irq_set_wake = ingenic_gpio_irq_set_wake;
jzgc->irq_chip.flags = IRQCHIP_MASK_ON_SUSPEND;
err = gpiochip_irqchip_add(&jzgc->gc, &jzgc->irq_chip, 0,
handle_level_irq, IRQ_TYPE_NONE);
if (err)
return err;
gpiochip_set_chained_irqchip(&jzgc->gc, &jzgc->irq_chip,
jzgc->irq, ingenic_gpio_irq_handler);
return 0;
}
static int ingenic_gpio_remove(struct platform_device *pdev)
{
return 0;
}
static struct platform_driver ingenic_gpio_driver = {
.driver = {
.name = "gpio-ingenic",
.of_match_table = of_match_ptr(ingenic_gpio_of_match),
},
.probe = ingenic_gpio_probe,
.remove = ingenic_gpio_remove,
};
static int __init ingenic_gpio_drv_register(void)
{
return platform_driver_register(&ingenic_gpio_driver);
}
subsys_initcall(ingenic_gpio_drv_register);
static void __exit ingenic_gpio_drv_unregister(void)
{
platform_driver_unregister(&ingenic_gpio_driver);
}
module_exit(ingenic_gpio_drv_unregister);
MODULE_AUTHOR("Paul Cercueil <paul@crapouillou.net>");
MODULE_DESCRIPTION("Ingenic JZ47xx GPIO driver");
MODULE_LICENSE("GPL");