linux-imx

/*

 * GPIO controller in LSI ZEVIO SoCs.

 *

 * Author: Fabian Vogt <fabian@ritter-vogt.de>

 *

 * 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.

 */

​

#include <linux/spinlock.h>

#include <linux/errno.h>

#include <linux/init.h>

#include <linux/bitops.h>

#include <linux/io.h>

#include <linux/of_device.h>

#include <linux/of_gpio.h>

#include <linux/slab.h>

#include <linux/gpio/driver.h>

​

/*

 * Memory layout:

 * This chip has four gpio sections, each controls 8 GPIOs.

 * Bit 0 in section 0 is GPIO 0, bit 2 in section 1 is GPIO 10.

 * Disclaimer: Reverse engineered!

 * For more information refer to:

 * http://hackspire.unsads.com/wiki/index.php/Memory-mapped_I/O_ports#90000000_-_General_Purpose_I.2FO_.28GPIO.29

 *

 * 0x00-0x3F: Section 0

 *     +0x00: Masked interrupt status (read-only)

 *     +0x04: R: Interrupt status W: Reset interrupt status

 *     +0x08: R: Interrupt mask W: Mask interrupt

 *     +0x0C: W: Unmask interrupt (write-only)

 *     +0x10: Direction: I/O=1/0

 *     +0x14: Output

 *     +0x18: Input (read-only)

 *     +0x20: R: Level interrupt W: Set as level interrupt

 * 0x40-0x7F: Section 1

 * 0x80-0xBF: Section 2

 * 0xC0-0xFF: Section 3

 */

​

#define ZEVIO_GPIO_SECTION_SIZE         0x40

​

/* Offsets to various registers */

#define ZEVIO_GPIO_INT_MASKED_STATUS    0x00

#define ZEVIO_GPIO_INT_STATUS       0x04

#define ZEVIO_GPIO_INT_UNMASK       0x08

#define ZEVIO_GPIO_INT_MASK     0x0C

#define ZEVIO_GPIO_DIRECTION        0x10

#define ZEVIO_GPIO_OUTPUT       0x14

#define ZEVIO_GPIO_INPUT            0x18

#define ZEVIO_GPIO_INT_STICKY       0x20

​

/* Bit number of GPIO in its section */

#define ZEVIO_GPIO_BIT(gpio) (gpio&7)

​

struct zevio_gpio {

    spinlock_t      lock;

    struct of_mm_gpio_chip  chip;

};

​

static inline u32 zevio_gpio_port_get(struct zevio_gpio *c, unsigned pin,