linux-imx

// SPDX-License-Identifier: GPL-2.0

/*

 * Cortina Systems Gemini OF physmap add-on

 * Copyright (C) 2017 Linus Walleij <linus.walleij@linaro.org>

 *

 * This SoC has an elaborate flash control register, so we need to

 * detect and set it up when booting on this platform.

 */

#include <linux/export.h>

#include <linux/of.h>

#include <linux/of_device.h>

#include <linux/mtd/map.h>

#include <linux/mtd/xip.h>

#include <linux/mfd/syscon.h>

#include <linux/regmap.h>

#include <linux/bitops.h>

#include <linux/pinctrl/consumer.h>

#include "physmap-gemini.h"

​

/*

 * The Flash-relevant parts of the global status register

 * These would also be relevant for a NAND driver.

 */

#define GLOBAL_STATUS           0x04

#define FLASH_TYPE_MASK         (0x3 << 24)

#define FLASH_TYPE_NAND_2K      (0x3 << 24)

#define FLASH_TYPE_NAND_512     (0x2 << 24)

#define FLASH_TYPE_PARALLEL     (0x1 << 24)

#define FLASH_TYPE_SERIAL       (0x0 << 24)

/* if parallel */

#define FLASH_WIDTH_16BIT       (1 << 23)   /* else 8 bit */

/* if serial */

#define FLASH_ATMEL         (1 << 23)   /* else STM */

​

#define FLASH_SIZE_MASK         (0x3 << 21)

#define NAND_256M           (0x3 << 21) /* and more */

#define NAND_128M           (0x2 << 21)

#define NAND_64M            (0x1 << 21)

#define NAND_32M            (0x0 << 21)

#define ATMEL_16M           (0x3 << 21) /* and more */

#define ATMEL_8M            (0x2 << 21)

#define ATMEL_4M_2M         (0x1 << 21)

#define ATMEL_1M            (0x0 << 21) /* and less */

#define STM_32M             (1 << 22)   /* and more */

#define STM_16M             (0 << 22)   /* and less */

​

#define FLASH_PARALLEL_HIGH_PIN_CNT (1 << 20)   /* else low pin cnt */

​

static const struct of_device_id syscon_match[] = {

    { .compatible = "cortina,gemini-syscon" },

    { },

};

​

struct gemini_flash {

    struct device *dev;

    struct pinctrl *p;

    struct pinctrl_state *enabled_state;

    struct pinctrl_state *disabled_state;

};

​

/* Static local state */

static struct gemini_flash *gf;

​