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/*
* Intel Whiskey Cove PMIC GPIO Driver
*
* This driver is written based on gpio-crystalcove.c
*
* Copyright (C) 2016 Intel Corporation. All rights reserved.
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License version
* 2 as published by the Free Software Foundation.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*/
#include <linux/bitops.h>
#include <linux/module.h>
#include <linux/interrupt.h>
#include <linux/gpio/driver.h>
#include <linux/mfd/intel_soc_pmic.h>
#include <linux/platform_device.h>
#include <linux/regmap.h>
#include <linux/seq_file.h>
/*
* Whiskey Cove PMIC has 13 physical GPIO pins divided into 3 banks:
* Bank 0: Pin 0 - 6
* Bank 1: Pin 7 - 10
* Bank 2: Pin 11 -12
* Each pin has one output control register and one input control register.
*/
#define BANK0_NR_PINS 7
#define BANK1_NR_PINS 4
#define BANK2_NR_PINS 2
#define WCOVE_GPIO_NUM (BANK0_NR_PINS + BANK1_NR_PINS + BANK2_NR_PINS)
#define WCOVE_VGPIO_NUM 94
/* GPIO output control registers (one per pin): 0x4e44 - 0x4e50 */
#define GPIO_OUT_CTRL_BASE 0x4e44
/* GPIO input control registers (one per pin): 0x4e51 - 0x4e5d */
#define GPIO_IN_CTRL_BASE 0x4e51
/*
* GPIO interrupts are organized in two groups:
* Group 0: Bank 0 pins (Pin 0 - 6)
* Group 1: Bank 1 and Bank 2 pins (Pin 7 - 12)
* Each group has two registers (one bit per pin): status and mask.
*/
#define GROUP0_NR_IRQS 7
#define GROUP1_NR_IRQS 6
#define IRQ_MASK_BASE 0x4e19
#define IRQ_STATUS_BASE 0x4e0b
#define UPDATE_IRQ_TYPE BIT(0)
#define UPDATE_IRQ_MASK BIT(1)
#define CTLI_INTCNT_DIS (0 << 1)
#define CTLI_INTCNT_NE (1 << 1)
#define CTLI_INTCNT_PE (2 << 1)
#define CTLI_INTCNT_BE (3 << 1)
#define CTLO_DIR_IN (0 << 5)
#define CTLO_DIR_OUT (1 << 5)
#define CTLO_DRV_MASK (1 << 4)
#define CTLO_DRV_OD (0 << 4)
#define CTLO_DRV_CMOS (1 << 4)
#define CTLO_DRV_REN (1 << 3)
#define CTLO_RVAL_2KDOWN (0 << 1)
#define CTLO_RVAL_2KUP (1 << 1)
#define CTLO_RVAL_50KDOWN (2 << 1)
#define CTLO_RVAL_50KUP (3 << 1)
#define CTLO_INPUT_SET (CTLO_DRV_CMOS | CTLO_DRV_REN | CTLO_RVAL_2KUP)
#define CTLO_OUTPUT_SET (CTLO_DIR_OUT | CTLO_INPUT_SET)
enum ctrl_register {
CTRL_IN,
CTRL_OUT,
};
/*
* struct wcove_gpio - Whiskey Cove GPIO controller
* @buslock: for bus lock/sync and unlock.
* @chip: the abstract gpio_chip structure.
* @dev: the gpio device
* @regmap: the regmap from the parent device.
* @regmap_irq_chip: the regmap of the gpio irq chip.
* @update: pending IRQ setting update, to be written to the chip upon unlock.
* @intcnt: the Interrupt Detect value to be written.
* @set_irq_mask: true if the IRQ mask needs to be set, false to clear.
*/
struct wcove_gpio {
struct mutex buslock;
struct gpio_chip chip;
struct device *dev;
struct regmap *regmap;
struct regmap_irq_chip_data *regmap_irq_chip;
int update;
int intcnt;
bool set_irq_mask;
};
static inline unsigned int to_reg(int gpio, enum ctrl_register reg_type)
{
unsigned int reg;
int bank;
if (gpio < BANK0_NR_PINS)
bank = 0;
else if (gpio < BANK0_NR_PINS + BANK1_NR_PINS)
bank = 1;
else
bank = 2;
if (reg_type == CTRL_IN)
reg = GPIO_IN_CTRL_BASE + bank;
else
reg = GPIO_OUT_CTRL_BASE + bank;
return reg;
}
static void wcove_update_irq_mask(struct wcove_gpio *wg, int gpio)
{
unsigned int reg, mask;
if (gpio < GROUP0_NR_IRQS) {
reg = IRQ_MASK_BASE;
mask = BIT(gpio % GROUP0_NR_IRQS);
} else {
reg = IRQ_MASK_BASE + 1;
mask = BIT((gpio - GROUP0_NR_IRQS) % GROUP1_NR_IRQS);
}
if (wg->set_irq_mask)
regmap_update_bits(wg->regmap, reg, mask, mask);
else
regmap_update_bits(wg->regmap, reg, mask, 0);
}
static void wcove_update_irq_ctrl(struct wcove_gpio *wg, int gpio)
{
unsigned int reg = to_reg(gpio, CTRL_IN);
regmap_update_bits(wg->regmap, reg, CTLI_INTCNT_BE, wg->intcnt);
}
static int wcove_gpio_dir_in(struct gpio_chip *chip, unsigned int gpio)
{
struct wcove_gpio *wg = gpiochip_get_data(chip);
return regmap_write(wg->regmap, to_reg(gpio, CTRL_OUT),
CTLO_INPUT_SET);
}
static int wcove_gpio_dir_out(struct gpio_chip *chip, unsigned int gpio,
int value)
{
struct wcove_gpio *wg = gpiochip_get_data(chip);
return regmap_write(wg->regmap, to_reg(gpio, CTRL_OUT),
CTLO_OUTPUT_SET | value);
}
static int wcove_gpio_get_direction(struct gpio_chip *chip, unsigned int gpio)
{
struct wcove_gpio *wg = gpiochip_get_data(chip);
unsigned int val;
int ret;
ret = regmap_read(wg->regmap, to_reg(gpio, CTRL_OUT), &val);
if (ret)
return ret;
return !(val & CTLO_DIR_OUT);
}
static int wcove_gpio_get(struct gpio_chip *chip, unsigned int gpio)
{
struct wcove_gpio *wg = gpiochip_get_data(chip);
unsigned int val;
int ret;
ret = regmap_read(wg->regmap, to_reg(gpio, CTRL_IN), &val);
if (ret)
return ret;
return val & 0x1;
}
static void wcove_gpio_set(struct gpio_chip *chip,
unsigned int gpio, int value)
{
struct wcove_gpio *wg = gpiochip_get_data(chip);
if (value)
regmap_update_bits(wg->regmap, to_reg(gpio, CTRL_OUT), 1, 1);
else
regmap_update_bits(wg->regmap, to_reg(gpio, CTRL_OUT), 1, 0);
}
static int wcove_gpio_set_single_ended(struct gpio_chip *chip,
unsigned int gpio,
enum single_ended_mode mode)
{
struct wcove_gpio *wg = gpiochip_get_data(chip);
switch (mode) {
case LINE_MODE_OPEN_DRAIN:
return regmap_update_bits(wg->regmap, to_reg(gpio, CTRL_OUT),
CTLO_DRV_MASK, CTLO_DRV_OD);
case LINE_MODE_PUSH_PULL:
return regmap_update_bits(wg->regmap, to_reg(gpio, CTRL_OUT),
CTLO_DRV_MASK, CTLO_DRV_CMOS);
default:
break;
}
return -ENOTSUPP;
}
static int wcove_irq_type(struct irq_data *data, unsigned int type)
{
struct gpio_chip *chip = irq_data_get_irq_chip_data(data);
struct wcove_gpio *wg = gpiochip_get_data(chip);
switch (type) {
case IRQ_TYPE_NONE:
wg->intcnt = CTLI_INTCNT_DIS;
break;
case IRQ_TYPE_EDGE_BOTH:
wg->intcnt = CTLI_INTCNT_BE;
break;
case IRQ_TYPE_EDGE_RISING:
wg->intcnt = CTLI_INTCNT_PE;
break;
case IRQ_TYPE_EDGE_FALLING:
wg->intcnt = CTLI_INTCNT_NE;
break;
default:
return -EINVAL;
}
wg->update |= UPDATE_IRQ_TYPE;
return 0;
}
static void wcove_bus_lock(struct irq_data *data)
{
struct gpio_chip *chip = irq_data_get_irq_chip_data(data);
struct wcove_gpio *wg = gpiochip_get_data(chip);
mutex_lock(&wg->buslock);
}
static void wcove_bus_sync_unlock(struct irq_data *data)
{
struct gpio_chip *chip = irq_data_get_irq_chip_data(data);
struct wcove_gpio *wg = gpiochip_get_data(chip);
int gpio = data->hwirq;
if (wg->update & UPDATE_IRQ_TYPE)
wcove_update_irq_ctrl(wg, gpio);
if (wg->update & UPDATE_IRQ_MASK)
wcove_update_irq_mask(wg, gpio);
wg->update = 0;
mutex_unlock(&wg->buslock);
}
static void wcove_irq_unmask(struct irq_data *data)
{
struct gpio_chip *chip = irq_data_get_irq_chip_data(data);
struct wcove_gpio *wg = gpiochip_get_data(chip);
wg->set_irq_mask = false;
wg->update |= UPDATE_IRQ_MASK;
}
static void wcove_irq_mask(struct irq_data *data)
{
struct gpio_chip *chip = irq_data_get_irq_chip_data(data);
struct wcove_gpio *wg = gpiochip_get_data(chip);
wg->set_irq_mask = true;
wg->update |= UPDATE_IRQ_MASK;
}
static struct
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