Commit fcb59bdf authored by Linus Walleij's avatar Linus Walleij

Merge branch 'bcm-nsp' into devel

parents e43d2b75 8bfcbbbc
Broadcom Northstar plus (NSP) GPIO/PINCONF Controller
Required properties:
- compatible:
Must be "brcm,nsp-gpio-a"
- reg:
Should contain the register physical address and length for each of
GPIO base, IO control registers
- #gpio-cells:
Must be two. The first cell is the GPIO pin number (within the
controller's pin space) and the second cell is used for the following:
bit[0]: polarity (0 for active high and 1 for active low)
- gpio-controller:
Specifies that the node is a GPIO controller
- ngpios:
Number of gpios supported (58x25 supports 32 and 58x23 supports 24)
Optional properties:
- interrupts:
Interrupt ID
- interrupt-controller:
Specifies that the node is an interrupt controller
- gpio-ranges:
Specifies the mapping between gpio controller and pin-controllers pins.
This requires 4 fields in cells defined as -
1. Phandle of pin-controller.
2. GPIO base pin offset.
3 Pin-control base pin offset.
4. number of gpio pins which are linearly mapped from pin base.
Supported generic PINCONF properties in child nodes:
- pins:
The list of pins (within the controller's own pin space) that properties
in the node apply to. Pin names are "gpio-<pin>"
- bias-disable:
Disable pin bias
- bias-pull-up:
Enable internal pull up resistor
- bias-pull-down:
Enable internal pull down resistor
- drive-strength:
Valid drive strength values include 2, 4, 6, 8, 10, 12, 14, 16 (mA)
Example:
gpioa: gpio@18000020 {
compatible = "brcm,nsp-gpio-a";
reg = <0x18000020 0x100>,
<0x1803f1c4 0x1c>;
#gpio-cells = <2>;
gpio-controller;
ngpios = <32>;
gpio-ranges = <&pinctrl 0 0 31>;
interrupt-controller;
interrupts = <GIC_SPI 85 IRQ_TYPE_LEVEL_HIGH>;
/* Hog a few default settings */
pinctrl-names = "default";
pinctrl-0 = <&led>;
led: led {
pins = "gpio-1";
bias-pull-up;
};
pwr: pwr {
gpio-hog;
gpios = <3 1>;
output-high;
};
};
......@@ -68,3 +68,20 @@ config PINCTRL_CYGNUS_MUX
The Broadcom Cygnus IOMUX driver supports group based IOMUX
configuration, with the exception that certain individual pins
can be overrided to GPIO function
config PINCTRL_NSP_GPIO
bool "Broadcom NSP GPIO (with PINCONF) driver"
depends on OF_GPIO && (ARCH_BCM_NSP || COMPILE_TEST)
select GPIOLIB_IRQCHIP
select PINCONF
select GENERIC_PINCONF
default ARCH_BCM_NSP
help
Say yes here to enable the Broadcom NSP GPIO driver.
The Broadcom Northstar Plus SoC ChipcommonA GPIO controller is
supported by this driver.
The ChipcommonA GPIO controller support basic PINCONF functions such
as bias pull up, pull down, and drive strength configurations, when
these pins are muxed to GPIO.
......@@ -4,3 +4,4 @@ obj-$(CONFIG_PINCTRL_BCM281XX) += pinctrl-bcm281xx.o
obj-$(CONFIG_PINCTRL_BCM2835) += pinctrl-bcm2835.o
obj-$(CONFIG_PINCTRL_IPROC_GPIO) += pinctrl-iproc-gpio.o
obj-$(CONFIG_PINCTRL_CYGNUS_MUX) += pinctrl-cygnus-mux.o
obj-$(CONFIG_PINCTRL_NSP_GPIO) += pinctrl-nsp-gpio.o
/*
* Copyright (C) 2015 Broadcom Corporation
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License as
* published by the Free Software Foundation version 2.
*
* This program is distributed "as is" WITHOUT ANY WARRANTY of any
* kind, whether express or implied; without even the implied warranty
* of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* This file contains the Broadcom Northstar Plus (NSP) GPIO driver that
* supports the chipCommonA GPIO controller. Basic PINCONF such as bias,
* pull up/down, slew and drive strength are also supported in this driver.
*
* Pins from the chipCommonA GPIO can be individually muxed to GPIO function,
* through the interaction with the NSP IOMUX controller.
*/
#include <linux/gpio.h>
#include <linux/interrupt.h>
#include <linux/io.h>
#include <linux/ioport.h>
#include <linux/kernel.h>
#include <linux/of_address.h>
#include <linux/of_device.h>
#include <linux/of_irq.h>
#include <linux/pinctrl/pinconf.h>
#include <linux/pinctrl/pinconf-generic.h>
#include <linux/pinctrl/pinctrl.h>
#include <linux/slab.h>
#include "../pinctrl-utils.h"
#define NSP_CHIP_A_INT_STATUS 0x00
#define NSP_CHIP_A_INT_MASK 0x04
#define NSP_GPIO_DATA_IN 0x40
#define NSP_GPIO_DATA_OUT 0x44
#define NSP_GPIO_OUT_EN 0x48
#define NSP_GPIO_INT_POLARITY 0x50
#define NSP_GPIO_INT_MASK 0x54
#define NSP_GPIO_EVENT 0x58
#define NSP_GPIO_EVENT_INT_MASK 0x5c
#define NSP_GPIO_EVENT_INT_POLARITY 0x64
#define NSP_CHIP_A_GPIO_INT_BIT 0x01
/* I/O parameters offset for chipcommon A GPIO */
#define NSP_GPIO_DRV_CTRL 0x00
#define NSP_GPIO_HYSTERESIS_EN 0x10
#define NSP_GPIO_SLEW_RATE_EN 0x14
#define NSP_PULL_UP_EN 0x18
#define NSP_PULL_DOWN_EN 0x1c
#define GPIO_DRV_STRENGTH_BITS 0x03
/*
* nsp GPIO core
*
* @dev: pointer to device
* @base: I/O register base for nsp GPIO controller
* @io_ctrl: I/O register base for PINCONF support outside the GPIO block
* @gc: GPIO chip
* @pctl: pointer to pinctrl_dev
* @pctldesc: pinctrl descriptor
* @irq_domain: pointer to irq domain
* @lock: lock to protect access to I/O registers
*/
struct nsp_gpio {
struct device *dev;
void __iomem *base;
void __iomem *io_ctrl;
struct gpio_chip gc;
struct pinctrl_dev *pctl;
struct pinctrl_desc pctldesc;
struct irq_domain *irq_domain;
spinlock_t lock;
};
enum base_type {
REG,
IO_CTRL
};
static inline struct nsp_gpio *to_nsp_gpio(struct gpio_chip *gc)
{
return container_of(gc, struct nsp_gpio, gc);
}
/*
* Mapping from PINCONF pins to GPIO pins is 1-to-1
*/
static inline unsigned nsp_pin_to_gpio(unsigned pin)
{
return pin;
}
/*
* nsp_set_bit - set or clear one bit (corresponding to the GPIO pin) in a
* nsp GPIO register
*
* @nsp_gpio: nsp GPIO device
* @base_type: reg base to modify
* @reg: register offset
* @gpio: GPIO pin
* @set: set or clear
*/
static inline void nsp_set_bit(struct nsp_gpio *chip, enum base_type address,
unsigned int reg, unsigned gpio, bool set)
{
u32 val;
void __iomem *base_address;
if (address == IO_CTRL)
base_address = chip->io_ctrl;
else
base_address = chip->base;
val = readl(base_address + reg);
if (set)
val |= BIT(gpio);
else
val &= ~BIT(gpio);
writel(val, base_address + reg);
}
/*
* nsp_get_bit - get one bit (corresponding to the GPIO pin) in a
* nsp GPIO register
*/
static inline bool nsp_get_bit(struct nsp_gpio *chip, enum base_type address,
unsigned int reg, unsigned gpio)
{
if (address == IO_CTRL)
return !!(readl(chip->io_ctrl + reg) & BIT(gpio));
else
return !!(readl(chip->base + reg) & BIT(gpio));
}
static irqreturn_t nsp_gpio_irq_handler(int irq, void *data)
{
struct nsp_gpio *chip = (struct nsp_gpio *)data;
struct gpio_chip gc = chip->gc;
int bit;
unsigned long int_bits = 0;
u32 int_status;
/* go through the entire GPIOs and handle all interrupts */
int_status = readl(chip->base + NSP_CHIP_A_INT_STATUS);
if (int_status & NSP_CHIP_A_GPIO_INT_BIT) {
unsigned int event, level;
/* Get level and edge interrupts */
event = readl(chip->base + NSP_GPIO_EVENT_INT_MASK) &
readl(chip->base + NSP_GPIO_EVENT);
level = readl(chip->base + NSP_GPIO_DATA_IN) ^
readl(chip->base + NSP_GPIO_INT_POLARITY);
level &= readl(chip->base + NSP_GPIO_INT_MASK);
int_bits = level | event;
for_each_set_bit(bit, &int_bits, gc.ngpio) {
/*
* Clear the interrupt before invoking the
* handler, so we do not leave any window
*/
writel(BIT(bit), chip->base + NSP_GPIO_EVENT);
generic_handle_irq(
irq_linear_revmap(chip->irq_domain, bit));
}
}
return int_bits ? IRQ_HANDLED : IRQ_NONE;
}
static void nsp_gpio_irq_ack(struct irq_data *d)
{
struct nsp_gpio *chip = irq_data_get_irq_chip_data(d);
unsigned gpio = d->hwirq;
u32 val = BIT(gpio);
u32 trigger_type;
trigger_type = irq_get_trigger_type(d->irq);
if (trigger_type & (IRQ_TYPE_EDGE_FALLING | IRQ_TYPE_EDGE_RISING))
nsp_set_bit(chip, REG, NSP_GPIO_EVENT, gpio, val);
}
/*
* nsp_gpio_irq_set_mask - mask/unmask a GPIO interrupt
*
* @d: IRQ chip data
* @unmask: mask/unmask GPIO interrupt
*/
static void nsp_gpio_irq_set_mask(struct irq_data *d, bool unmask)
{
struct nsp_gpio *chip = irq_data_get_irq_chip_data(d);
unsigned gpio = d->hwirq;
u32 trigger_type;
trigger_type = irq_get_trigger_type(d->irq);
if (trigger_type & (IRQ_TYPE_EDGE_FALLING | IRQ_TYPE_EDGE_RISING))
nsp_set_bit(chip, REG, NSP_GPIO_EVENT_INT_MASK, gpio, unmask);
else
nsp_set_bit(chip, REG, NSP_GPIO_INT_MASK, gpio, unmask);
}
static void nsp_gpio_irq_mask(struct irq_data *d)
{
struct nsp_gpio *chip = irq_data_get_irq_chip_data(d);
unsigned long flags;
spin_lock_irqsave(&chip->lock, flags);
nsp_gpio_irq_set_mask(d, false);
spin_unlock_irqrestore(&chip->lock, flags);
}
static void nsp_gpio_irq_unmask(struct irq_data *d)
{
struct nsp_gpio *chip = irq_data_get_irq_chip_data(d);
unsigned long flags;
spin_lock_irqsave(&chip->lock, flags);
nsp_gpio_irq_set_mask(d, true);
spin_unlock_irqrestore(&chip->lock, flags);
}
static int nsp_gpio_irq_set_type(struct irq_data *d, unsigned int type)
{
struct nsp_gpio *chip = irq_data_get_irq_chip_data(d);
unsigned gpio = d->hwirq;
bool level_low;
bool falling;
unsigned long flags;
spin_lock_irqsave(&chip->lock, flags);
falling = nsp_get_bit(chip, REG, NSP_GPIO_EVENT_INT_POLARITY, gpio);
level_low = nsp_get_bit(chip, REG, NSP_GPIO_INT_POLARITY, gpio);
switch (type & IRQ_TYPE_SENSE_MASK) {
case IRQ_TYPE_EDGE_RISING:
falling = false;
break;
case IRQ_TYPE_EDGE_FALLING:
falling = true;
break;
case IRQ_TYPE_LEVEL_HIGH:
level_low = false;
break;
case IRQ_TYPE_LEVEL_LOW:
level_low = true;
break;
default:
dev_err(chip->dev, "invalid GPIO IRQ type 0x%x\n",
type);
spin_unlock_irqrestore(&chip->lock, flags);
return -EINVAL;
}
nsp_set_bit(chip, REG, NSP_GPIO_EVENT_INT_POLARITY, gpio, falling);
nsp_set_bit(chip, REG, NSP_GPIO_INT_POLARITY, gpio, level_low);
spin_unlock_irqrestore(&chip->lock, flags);
dev_dbg(chip->dev, "gpio:%u level_low:%s falling:%s\n", gpio,
level_low ? "true" : "false", falling ? "true" : "false");
return 0;
}
static struct irq_chip nsp_gpio_irq_chip = {
.name = "gpio-a",
.irq_enable = nsp_gpio_irq_unmask,
.irq_disable = nsp_gpio_irq_mask,
.irq_ack = nsp_gpio_irq_ack,
.irq_mask = nsp_gpio_irq_mask,
.irq_unmask = nsp_gpio_irq_unmask,
.irq_set_type = nsp_gpio_irq_set_type,
};
/*
* Request the nsp IOMUX pinmux controller to mux individual pins to GPIO
*/
static int nsp_gpio_request(struct gpio_chip *gc, unsigned offset)
{
unsigned gpio = gc->base + offset;
return pinctrl_request_gpio(gpio);
}
static void nsp_gpio_free(struct gpio_chip *gc, unsigned offset)
{
unsigned gpio = gc->base + offset;
pinctrl_free_gpio(gpio);
}
static int nsp_gpio_direction_input(struct gpio_chip *gc, unsigned gpio)
{
struct nsp_gpio *chip = to_nsp_gpio(gc);
unsigned long flags;
spin_lock_irqsave(&chip->lock, flags);
nsp_set_bit(chip, REG, NSP_GPIO_OUT_EN, gpio, false);
spin_unlock_irqrestore(&chip->lock, flags);
dev_dbg(chip->dev, "gpio:%u set input\n", gpio);
return 0;
}
static int nsp_gpio_direction_output(struct gpio_chip *gc, unsigned gpio,
int val)
{
struct nsp_gpio *chip = to_nsp_gpio(gc);
unsigned long flags;
spin_lock_irqsave(&chip->lock, flags);
nsp_set_bit(chip, REG, NSP_GPIO_OUT_EN, gpio, true);
nsp_set_bit(chip, REG, NSP_GPIO_DATA_OUT, gpio, !!(val));
spin_unlock_irqrestore(&chip->lock, flags);
dev_dbg(chip->dev, "gpio:%u set output, value:%d\n", gpio, val);
return 0;
}
static void nsp_gpio_set(struct gpio_chip *gc, unsigned gpio, int val)
{
struct nsp_gpio *chip = to_nsp_gpio(gc);
unsigned long flags;
spin_lock_irqsave(&chip->lock, flags);
nsp_set_bit(chip, REG, NSP_GPIO_DATA_OUT, gpio, !!(val));
spin_unlock_irqrestore(&chip->lock, flags);
dev_dbg(chip->dev, "gpio:%u set, value:%d\n", gpio, val);
}
static int nsp_gpio_get(struct gpio_chip *gc, unsigned gpio)
{
struct nsp_gpio *chip = to_nsp_gpio(gc);
return !!(readl(chip->base + NSP_GPIO_DATA_IN) & BIT(gpio));
}
static int nsp_gpio_to_irq(struct gpio_chip *gc, unsigned offset)
{
struct nsp_gpio *chip = to_nsp_gpio(gc);
return irq_linear_revmap(chip->irq_domain, offset);
}
static int nsp_get_groups_count(struct pinctrl_dev *pctldev)
{
return 1;
}
/*
* Only one group: "gpio_grp", since this local pinctrl device only performs
* GPIO specific PINCONF configurations
*/
static const char *nsp_get_group_name(struct pinctrl_dev *pctldev,
unsigned selector)
{
return "gpio_grp";
}
static const struct pinctrl_ops nsp_pctrl_ops = {
.get_groups_count = nsp_get_groups_count,
.get_group_name = nsp_get_group_name,
.dt_node_to_map = pinconf_generic_dt_node_to_map_pin,
.dt_free_map = pinctrl_utils_dt_free_map,
};
static int nsp_gpio_set_slew(struct nsp_gpio *chip, unsigned gpio, u16 slew)
{
if (slew)
nsp_set_bit(chip, IO_CTRL, NSP_GPIO_SLEW_RATE_EN, gpio, true);
else
nsp_set_bit(chip, IO_CTRL, NSP_GPIO_SLEW_RATE_EN, gpio, false);
return 0;
}
static int nsp_gpio_set_pull(struct nsp_gpio *chip, unsigned gpio,
bool pull_up, bool pull_down)
{
unsigned long flags;
spin_lock_irqsave(&chip->lock, flags);
nsp_set_bit(chip, IO_CTRL, NSP_PULL_DOWN_EN, gpio, pull_down);
nsp_set_bit(chip, IO_CTRL, NSP_PULL_UP_EN, gpio, pull_up);
spin_unlock_irqrestore(&chip->lock, flags);
dev_dbg(chip->dev, "gpio:%u set pullup:%d pulldown: %d\n",
gpio, pull_up, pull_down);
return 0;
}
static void nsp_gpio_get_pull(struct nsp_gpio *chip, unsigned gpio,
bool *pull_up, bool *pull_down)
{
unsigned long flags;
spin_lock_irqsave(&chip->lock, flags);
*pull_up = nsp_get_bit(chip, IO_CTRL, NSP_PULL_UP_EN, gpio);
*pull_down = nsp_get_bit(chip, IO_CTRL, NSP_PULL_DOWN_EN, gpio);
spin_unlock_irqrestore(&chip->lock, flags);
}
static int nsp_gpio_set_strength(struct nsp_gpio *chip, unsigned gpio,
u16 strength)
{
u32 offset, shift, i;
u32 val;
unsigned long flags;
/* make sure drive strength is supported */
if (strength < 2 || strength > 16 || (strength % 2))
return -ENOTSUPP;
shift = gpio;
offset = NSP_GPIO_DRV_CTRL;
dev_dbg(chip->dev, "gpio:%u set drive strength:%d mA\n", gpio,
strength);
spin_lock_irqsave(&chip->lock, flags);
strength = (strength / 2) - 1;
for (i = GPIO_DRV_STRENGTH_BITS; i > 0; i--) {
val = readl(chip->io_ctrl + offset);
val &= ~BIT(shift);
val |= ((strength >> (i-1)) & 0x1) << shift;
writel(val, chip->io_ctrl + offset);
offset += 4;
}
spin_unlock_irqrestore(&chip->lock, flags);
return 0;
}
static int nsp_gpio_get_strength(struct nsp_gpio *chip, unsigned gpio,
u16 *strength)
{
unsigned int i, offset, shift;
u32 val;
unsigned long flags;
offset = NSP_GPIO_DRV_CTRL;
shift = gpio;
spin_lock_irqsave(&chip->lock, flags);
*strength = 0;
for (i = (GPIO_DRV_STRENGTH_BITS - 1); i >= 0; i--) {
val = readl(chip->io_ctrl + offset) & BIT(shift);
val >>= shift;
*strength += (val << i);
offset += 4;
}
/* convert to mA */
*strength = (*strength + 1) * 2;
spin_unlock_irqrestore(&chip->lock, flags);
return 0;
}
int nsp_pin_config_group_get(struct pinctrl_dev *pctldev, unsigned selector,
unsigned long *config)
{
return 0;
}
int nsp_pin_config_group_set(struct pinctrl_dev *pctldev, unsigned selector,
unsigned long *configs, unsigned num_configs)
{
return 0;
}
static int nsp_pin_config_get(struct pinctrl_dev *pctldev, unsigned pin,
unsigned long *config)
{
struct nsp_gpio *chip = pinctrl_dev_get_drvdata(pctldev);
enum pin_config_param param = pinconf_to_config_param(*config);
unsigned int gpio;
u16 arg = 0;
bool pull_up, pull_down;
int ret;
gpio = nsp_pin_to_gpio(pin);
switch (param) {
case PIN_CONFIG_BIAS_DISABLE:
nsp_gpio_get_pull(chip, gpio, &pull_up, &pull_down);
if ((pull_up == false) && (pull_down == false))
return 0;
else
return -EINVAL;
case PIN_CONFIG_BIAS_PULL_UP:
nsp_gpio_get_pull(chip, gpio, &pull_up, &pull_down);
if (pull_up)
return 0;
else
return -EINVAL;
case PIN_CONFIG_BIAS_PULL_DOWN:
nsp_gpio_get_pull(chip, gpio, &pull_up, &pull_down);
if (pull_down)
return 0;
else
return -EINVAL;
case PIN_CONFIG_DRIVE_STRENGTH:
ret = nsp_gpio_get_strength(chip, gpio, &arg);
if (ret)
return ret;
*config = pinconf_to_config_packed(param, arg);
return 0;
default:
return -ENOTSUPP;
}
}
static int nsp_pin_config_set(struct pinctrl_dev *pctldev, unsigned pin,
unsigned long *configs, unsigned num_configs)
{
struct nsp_gpio *chip = pinctrl_dev_get_drvdata(pctldev);
enum pin_config_param param;
u16 arg;
unsigned int i, gpio;
int ret = -ENOTSUPP;
gpio = nsp_pin_to_gpio(pin);
for (i = 0; i < num_configs; i++) {
param = pinconf_to_config_param(configs[i]);
arg = pinconf_to_config_argument(configs[i]);
switch (param) {
case PIN_CONFIG_BIAS_DISABLE:
ret = nsp_gpio_set_pull(chip, gpio, false, false);
if (ret < 0)
goto out;
break;
case PIN_CONFIG_BIAS_PULL_UP:
ret = nsp_gpio_set_pull(chip, gpio, true, false);
if (ret < 0)
goto out;
break;
case PIN_CONFIG_BIAS_PULL_DOWN:
ret = nsp_gpio_set_pull(chip, gpio, false, true);
if (ret < 0)
goto out;
break;
case PIN_CONFIG_DRIVE_STRENGTH:
ret = nsp_gpio_set_strength(chip, gpio, arg);
if (ret < 0)
goto out;
break;
case PIN_CONFIG_SLEW_RATE:
ret = nsp_gpio_set_slew(chip, gpio, arg);
if (ret < 0)
goto out;
break;
default:
dev_err(chip->dev, "invalid configuration\n");
return -ENOTSUPP;
}
}
out:
return ret;
}
static const struct pinconf_ops nsp_pconf_ops = {
.is_generic = true,
.pin_config_get = nsp_pin_config_get,
.pin_config_set = nsp_pin_config_set,
.pin_config_group_get = nsp_pin_config_group_get,
.pin_config_group_set = nsp_pin_config_group_set,
};
/*
* NSP GPIO controller supports some PINCONF related configurations such as
* pull up, pull down, slew and drive strength, when the pin is configured
* to GPIO.
*
* Here a local pinctrl device is created with simple 1-to-1 pin mapping to the
* local GPIO pins
*/
static int nsp_gpio_register_pinconf(struct nsp_gpio *chip)
{
struct pinctrl_desc *pctldesc = &chip->pctldesc;
struct pinctrl_pin_desc *pins;
struct gpio_chip *gc = &chip->gc;
int i;
pins = devm_kcalloc(chip->dev, gc->ngpio, sizeof(*pins), GFP_KERNEL);
if (!pins)
return -ENOMEM;
for (i = 0; i < gc->ngpio; i++) {
pins[i].number = i;
pins[i].name = devm_kasprintf(chip->dev, GFP_KERNEL,
"gpio-%d", i);
if (!pins[i].name)
return -ENOMEM;
}
pctldesc->name = dev_name(chip->dev);
pctldesc->pctlops = &nsp_pctrl_ops;
pctldesc->pins = pins;
pctldesc->npins = gc->ngpio;
pctldesc->confops = &nsp_pconf_ops;
chip->pctl = pinctrl_register(pctldesc, chip->dev, chip);
if (IS_ERR(chip->pctl)) {
dev_err(chip->dev, "unable to register pinctrl device\n");
return PTR_ERR(chip->pctl);
}
return 0;
}
static const struct of_device_id nsp_gpio_of_match[] = {
{.compatible = "brcm,nsp-gpio-a",},
{}
};
static int nsp_gpio_probe(struct platform_device *pdev)
{
struct device *dev = &pdev->dev;
struct resource *res;
struct nsp_gpio *chip;
struct gpio_chip *gc;
u32 val, count;
int irq, ret;
if (of_property_read_u32(pdev->dev.of_node, "ngpios", &val)) {
dev_err(&pdev->dev, "Missing ngpios OF property\n");
return -ENODEV;
}
chip = devm_kzalloc(dev, sizeof(*chip), GFP_KERNEL);
if (!chip)
return -ENOMEM;
chip->dev = dev;
platform_set_drvdata(pdev, chip);
res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
chip->base = devm_ioremap_resource(dev, res);
if (IS_ERR(chip->base)) {
dev_err(dev, "unable to map I/O memory\n");
return PTR_ERR(chip->base);
}
res = platform_get_resource(pdev, IORESOURCE_MEM, 1);
chip->io_ctrl = devm_ioremap_resource(dev, res);
if (IS_ERR(chip->io_ctrl)) {
dev_err(dev, "unable to map I/O memory\n");
return PTR_ERR(chip->io_ctrl);
}
spin_lock_init(&chip->lock);
gc = &chip->gc;
gc->base = -1;
gc->can_sleep = false;
gc->ngpio = val;
gc->label = dev_name(dev);
gc->dev = dev;
gc->of_node = dev->of_node;
gc->request = nsp_gpio_request;
gc->free = nsp_gpio_free;
gc->direction_input = nsp_gpio_direction_input;
gc->direction_output = nsp_gpio_direction_output;
gc->set = nsp_gpio_set;
gc->get = nsp_gpio_get;
gc->to_irq = nsp_gpio_to_irq;
/* optional GPIO interrupt support */
irq = platform_get_irq(pdev, 0);
if (irq > 0) {
/* Create irq domain so that each pin can be assigned an IRQ.*/
chip->irq_domain = irq_domain_add_linear(gc->of_node, gc->ngpio,
&irq_domain_simple_ops,
chip);
if (!chip->irq_domain) {
dev_err(&pdev->dev, "Couldn't allocate IRQ domain\n");
return -ENXIO;
}
/* Map each gpio to an IRQ and set the handler for gpiolib. */
for (count = 0; count < gc->ngpio; count++) {
int irq = irq_create_mapping(chip->irq_domain, count);
irq_set_chip_and_handler(irq, &nsp_gpio_irq_chip,
handle_simple_irq);
set_irq_flags(irq, IRQF_VALID);
irq_set_chip_data(irq, chip);
}
/* Install ISR for this GPIO controller. */
ret = devm_request_irq(&pdev->dev, irq, nsp_gpio_irq_handler,
IRQF_SHARED, "gpio-a", chip);
if (ret) {
dev_err(&pdev->dev, "Unable to request IRQ%d: %d\n",
irq, ret);
goto err_rm_gpiochip;
}
val = readl(chip->base + NSP_CHIP_A_INT_MASK);
val = val | NSP_CHIP_A_GPIO_INT_BIT;
writel(val, (chip->base + NSP_CHIP_A_INT_MASK));
}
ret = gpiochip_add(gc);
if (ret < 0) {
dev_err(dev, "unable to add GPIO chip\n");
return ret;
}
ret = nsp_gpio_register_pinconf(chip);
if (ret) {
dev_err(dev, "unable to register pinconf\n");
goto err_rm_gpiochip;
}
return 0;
err_rm_gpiochip:
gpiochip_remove(gc);
return ret;
}
static struct platform_driver nsp_gpio_driver = {
.driver = {
.name = "nsp-gpio-a",
.of_match_table = nsp_gpio_of_match,
},
.probe = nsp_gpio_probe,
};
static int __init nsp_gpio_init(void)
{
return platform_driver_probe(&nsp_gpio_driver, nsp_gpio_probe);
}
arch_initcall_sync(nsp_gpio_init);
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