linux-imx

/*

 * Driver for Allwinner sun4i Pulse Width Modulation Controller

 *

 * Copyright (C) 2014 Alexandre Belloni <alexandre.belloni@free-electrons.com>

 *

 * Licensed under GPLv2.

 */

​

#include <linux/bitops.h>

#include <linux/clk.h>

#include <linux/delay.h>

#include <linux/err.h>

#include <linux/io.h>

#include <linux/jiffies.h>

#include <linux/module.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/spinlock.h>

#include <linux/time.h>

​

#define PWM_CTRL_REG        0x0

​

#define PWM_CH_PRD_BASE     0x4

#define PWM_CH_PRD_OFFSET   0x4

#define PWM_CH_PRD(ch)      (PWM_CH_PRD_BASE + PWM_CH_PRD_OFFSET * (ch))

​

#define PWMCH_OFFSET        15

#define PWM_PRESCAL_MASK    GENMASK(3, 0)

#define PWM_PRESCAL_OFF     0

#define PWM_EN          BIT(4)

#define PWM_ACT_STATE       BIT(5)

#define PWM_CLK_GATING      BIT(6)

#define PWM_MODE        BIT(7)

#define PWM_PULSE       BIT(8)

#define PWM_BYPASS      BIT(9)

​

#define PWM_RDY_BASE        28

#define PWM_RDY_OFFSET      1

#define PWM_RDY(ch)     BIT(PWM_RDY_BASE + PWM_RDY_OFFSET * (ch))

​

#define PWM_PRD(prd)        (((prd) - 1) << 16)

#define PWM_PRD_MASK        GENMASK(15, 0)

​

#define PWM_DTY_MASK        GENMASK(15, 0)

​

#define PWM_REG_PRD(reg)    ((((reg) >> 16) & PWM_PRD_MASK) + 1)

#define PWM_REG_DTY(reg)    ((reg) & PWM_DTY_MASK)

#define PWM_REG_PRESCAL(reg, chan)  (((reg) >> ((chan) * PWMCH_OFFSET)) & PWM_PRESCAL_MASK)

​

#define BIT_CH(bit, chan)   ((bit) << ((chan) * PWMCH_OFFSET))

​

static const u32 prescaler_table[] = {

    120,

    180,

    240,

    360,

    480,

    0,

    0,

    0,