linux-imx

/*

 * Broadcom BCM7038 PWM driver

 * Author: Florian Fainelli

 *

 * Copyright (C) 2015 Broadcom Corporation

 *

 * This program is free software; you can redistribute it and/or modify

 * it under the terms of the GNU General Public License as published by

 * the Free Software Foundation; either version 2 of the License, or

 * (at your option) any later version.

 *

 * 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.

 */

​

#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt

​

#include <linux/clk.h>

#include <linux/export.h>

#include <linux/init.h>

#include <linux/io.h>

#include <linux/kernel.h>

#include <linux/module.h>

#include <linux/of.h>

#include <linux/platform_device.h>

#include <linux/pwm.h>

#include <linux/spinlock.h>

​

#define PWM_CTRL        0x00

#define  CTRL_START     BIT(0)

#define  CTRL_OEB       BIT(1)

#define  CTRL_FORCE_HIGH    BIT(2)

#define  CTRL_OPENDRAIN     BIT(3)

#define  CTRL_CHAN_OFFS     4

​

#define PWM_CTRL2       0x04

#define  CTRL2_OUT_SELECT   BIT(0)

​

#define PWM_CH_SIZE     0x8

​

#define PWM_CWORD_MSB(ch)   (0x08 + ((ch) * PWM_CH_SIZE))

#define PWM_CWORD_LSB(ch)   (0x0c + ((ch) * PWM_CH_SIZE))

​

/* Number of bits for the CWORD value */

#define CWORD_BIT_SIZE      16

​

/*

 * Maximum control word value allowed when variable-frequency PWM is used as a

 * clock for the constant-frequency PMW.

 */

#define CONST_VAR_F_MAX     32768

#define CONST_VAR_F_MIN     1

​

#define PWM_ON(ch)      (0x18 + ((ch) * PWM_CH_SIZE))

#define  PWM_ON_MIN     1

#define PWM_PERIOD(ch)      (0x1c + ((ch) * PWM_CH_SIZE))

#define  PWM_PERIOD_MIN     0

​

#define PWM_ON_PERIOD_MAX   0xff

​

struct brcmstb_pwm {

    void __iomem *base;

    spinlock_t lock;

    struct clk *clk;

    struct pwm_chip chip;

};

​

static inline u32 brcmstb_pwm_readl(struct brcmstb_pwm *p,

                    unsigned int offset)

{

    if (IS_ENABLED(CONFIG_MIPS) && IS_ENABLED(CONFIG_CPU_BIG_ENDIAN))

        return __raw_readl(p->base + offset);

    else

        return readl_relaxed(p->base + offset);

}

​

static inline void brcmstb_pwm_writel(struct brcmstb_pwm *p, u32 value,

                      unsigned int offset)

{

    if (IS_ENABLED(CONFIG_MIPS) && IS_ENABLED(CONFIG_CPU_BIG_ENDIAN))

        __raw_writel(value, p->base + offset);

    else

        writel_relaxed(value, p->base + offset);

}

​

static inline struct brcmstb_pwm *to_brcmstb_pwm(struct pwm_chip *chip)

{

    return container_of(chip, struct brcmstb_pwm, chip);

}

​