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/*
* Copyright (C) 2014-2017 Broadcom
*
* 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/driver.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
* @lock: lock to protect access to I/O registers
*/
struct nsp_gpio {
struct device *dev;
void __iomem *base;
void __iomem *io_ctrl;
struct irq_chip irqchip;
struct gpio_chip gc;
struct pinctrl_dev *pctl;
struct pinctrl_desc pctldesc;
raw_spinlock_t lock;
};
enum base_type {
REG,
IO_CTRL
};
/*
* 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 gpio_chip *gc = (struct gpio_chip *)data;
struct nsp_gpio *chip = gpiochip_get_data(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(gc->irq.domain, bit));
}
}
return int_bits ? IRQ_HANDLED : IRQ_NONE;
}
static void nsp_gpio_irq_ack(struct irq_data *d)
{
struct gpio_chip *gc = irq_data_get_irq_chip_data(d);
struct nsp_gpio *chip = gpiochip_get_data(gc);
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 gpio_chip *gc = irq_data_get_irq_chip_data(d);
struct nsp_gpio *chip = gpiochip_get_data(gc);
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 gpio_chip *gc = irq_data_get_irq_chip_data(d);
struct nsp_gpio *chip = gpiochip_get_data(gc);
unsigned long flags;
raw_spin_lock_irqsave(&chip->lock, flags);
nsp_gpio_irq_set_mask(d, false);
raw_spin_unlock_irqrestore(&chip->lock, flags);
}
static void nsp_gpio_irq_unmask(struct irq_data *d)
{
struct gpio_chip *gc = irq_data_get_irq_chip_data(d);
struct nsp_gpio *chip = gpiochip_get_data(gc);
unsigned long flags;
raw_spin_lock_irqsave(&chip->lock, flags);
nsp_gpio_irq_set_mask(d, true);
raw_spin_unlock_irqrestore(&chip->lock, flags);
}
static int nsp_gpio_irq_set_type(struct irq_data *d,
|