linux-imx

/*

 * Mediatek Pulse Width Modulator driver

 *

 * Copyright (C) 2015 John Crispin <blogic@openwrt.org>

 * Copyright (C) 2017 Zhi Mao <zhi.mao@mediatek.com>

 *

 * This file is licensed under the terms of the GNU General Public

 * License version 2. This program is licensed "as is" without any

 * warranty of any kind, whether express or implied.

 */

​

#include <linux/err.h>

#include <linux/io.h>

#include <linux/ioport.h>

#include <linux/kernel.h>

#include <linux/module.h>

#include <linux/clk.h>

#include <linux/of.h>

#include <linux/of_device.h>

#include <linux/platform_device.h>

#include <linux/pwm.h>

#include <linux/slab.h>

#include <linux/types.h>

​

/* PWM registers and bits definitions */

#define PWMCON          0x00

#define PWMHDUR         0x04

#define PWMLDUR         0x08

#define PWMGDUR         0x0c

#define PWMWAVENUM      0x28

#define PWMDWIDTH       0x2c

#define PWM45DWIDTH_FIXUP   0x30

#define PWMTHRES        0x30

#define PWM45THRES_FIXUP    0x34

​

#define PWM_CLK_DIV_MAX     7

​

enum {

    MTK_CLK_MAIN = 0,

    MTK_CLK_TOP,

    MTK_CLK_PWM1,

    MTK_CLK_PWM2,

    MTK_CLK_PWM3,

    MTK_CLK_PWM4,

    MTK_CLK_PWM5,

    MTK_CLK_PWM6,

    MTK_CLK_PWM7,

    MTK_CLK_PWM8,

    MTK_CLK_MAX,

};

​

static const char * const mtk_pwm_clk_name[MTK_CLK_MAX] = {

    "main", "top", "pwm1", "pwm2", "pwm3", "pwm4", "pwm5", "pwm6", "pwm7",

    "pwm8"

};

​

struct mtk_pwm_platform_data {

    unsigned int num_pwms;

    bool pwm45_fixup;

    bool has_clks;

};

​

/**

 * struct mtk_pwm_chip - struct representing PWM chip

 * @chip: linux PWM chip representation

 * @regs: base address of PWM chip

 * @clks: list of clocks

 */

struct mtk_pwm_chip {

    struct pwm_chip chip;

    void __iomem *regs;

    struct clk *clks[MTK_CLK_MAX];

    const struct mtk_pwm_platform_data *soc;

};

​

static const unsigned int mtk_pwm_reg_offset[] = {

    0x0010, 0x0050, 0x0090, 0x00d0, 0x0110, 0x0150, 0x0190, 0x0220

};

​

static inline struct mtk_pwm_chip *to_mtk_pwm_chip(struct pwm_chip *chip)

{

    return container_of(chip, struct mtk_pwm_chip, chip);

}

​

static int mtk_pwm_clk_enable(struct pwm_chip *chip, struct pwm_device *pwm)

{

    struct mtk_pwm_chip *pc = to_mtk_pwm_chip(chip);

    int ret;

​

    if (!pc->soc->has_clks)

        return 0;

​