linux-imx

// SPDX-License-Identifier: GPL-2.0+

/*

 * Access to GPIOs on TWL4030/TPS659x0 chips

 *

 * Copyright (C) 2006-2007 Texas Instruments, Inc.

 * Copyright (C) 2006 MontaVista Software, Inc.

 *

 * Code re-arranged and cleaned up by:

 *  Syed Mohammed Khasim <x0khasim@ti.com>

 *

 * Initial Code:

 *  Andy Lowe / Nishanth Menon

 */

​

#include <linux/module.h>

#include <linux/init.h>

#include <linux/interrupt.h>

#include <linux/kthread.h>

#include <linux/irq.h>

#include <linux/gpio/driver.h>

#include <linux/platform_device.h>

#include <linux/of.h>

#include <linux/irqdomain.h>

​

#include <linux/mfd/twl.h>

​

/*

 * The GPIO "subchip" supports 18 GPIOs which can be configured as

 * inputs or outputs, with pullups or pulldowns on each pin.  Each

 * GPIO can trigger interrupts on either or both edges.

 *

 * GPIO interrupts can be fed to either of two IRQ lines; this is

 * intended to support multiple hosts.

 *

 * There are also two LED pins used sometimes as output-only GPIOs.

 */

​

/* genirq interfaces are not available to modules */

#ifdef MODULE

#define is_module() true

#else

#define is_module() false

#endif

​

/* GPIO_CTRL Fields */

#define MASK_GPIO_CTRL_GPIO0CD1     BIT(0)

#define MASK_GPIO_CTRL_GPIO1CD2     BIT(1)

#define MASK_GPIO_CTRL_GPIO_ON      BIT(2)

​

/* Mask for GPIO registers when aggregated into a 32-bit integer */

#define GPIO_32_MASK            0x0003ffff

​

struct gpio_twl4030_priv {

    struct gpio_chip gpio_chip;

    struct mutex mutex;

    int irq_base;

​

    /* Bitfields for state caching */

    unsigned int usage_count;

    unsigned int direction;

    unsigned int out_state;

};

​

/*----------------------------------------------------------------------*/

​

/*

 * To configure TWL4030 GPIO module registers

 */

static inline int gpio_twl4030_write(u8 address, u8 data)

{

    return twl_i2c_write_u8(TWL4030_MODULE_GPIO, data, address);

}

​

/*----------------------------------------------------------------------*/

​

/*

 * LED register offsets from TWL_MODULE_LED base

 * PWMs A and B are dedicated to LEDs A and B, respectively.

 */

​

#define TWL4030_LED_LEDEN_REG   0x00

#define TWL4030_PWMAON_REG  0x01

#define TWL4030_PWMAOFF_REG 0x02

#define TWL4030_PWMBON_REG  0x03

#define TWL4030_PWMBOFF_REG 0x04

​

/* LEDEN bits */

#define LEDEN_LEDAON        BIT(0)

#define LEDEN_LEDBON        BIT(1)

#define LEDEN_LEDAEXT       BIT(2)

#define LEDEN_LEDBEXT       BIT(3)

#define LEDEN_LEDAPWM       BIT(4)