src/soc/rockchip/rk3288/pwm.c

/*
 * This file is part of the coreboot project.
 *
 * Copyright 2014 Rockchip Inc.
 *
 * 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; version 2 of the License.
 *
 * 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.
 */

#include <arch/io.h>
#include <assert.h>
#include <console/console.h>
#include <delay.h>
#include <soc/addressmap.h>
#include <soc/grf.h>
#include <soc/soc.h>
#include <soc/pwm.h>
#include <soc/clock.h>
#include <stdlib.h>
#include <timer.h>

struct pwm_ctl {
	u32	pwm_cnt;
	u32	pwm_period_hpr;
	u32	pwm_duty_lpr;
	u32	pwm_ctrl;
};

struct rk3288_pwm_regs {
	struct pwm_ctl pwm[4];
	u32	intsts;
	u32	int_en;
};
check_member(rk3288_pwm_regs, int_en, 0x44);

#define RK_PWM_DISABLE                  (0 << 0)
#define RK_PWM_ENABLE                   (1 << 0)


#define PWM_ONE_SHOT                    (0 << 1)
#define PWM_CONTINUOUS                  (1 << 1)
#define RK_PWM_CAPTURE                  (1 << 2)

#define PWM_DUTY_POSTIVE                (1 << 3)
#define PWM_DUTY_NEGATIVE               (0 << 3)

#define PWM_INACTIVE_POSTIVE            (1 << 4)
#define PWM_INACTIVE_NEGATIVE           (0 << 4)

#define PWM_OUTPUT_LEFT                 (0 << 5)
#define PWM_OUTPUT_CENTER               (1 << 5)

#define PWM_LP_ENABLE                   (1 << 8)
#define PWM_LP_DISABLE                  (0 << 8)

#define PWM_SEL_SCALE_CLK			(1 << 9)
#define PWM_SEL_SRC_CLK				(0 << 9)

struct rk3288_pwm_regs *rk3288_pwm = (void *)RK_PWM0123_BASE;

void pwm_init(u32 id, u32 period_ns, u32 duty_ns)
{
	unsigned long period, duty;

	/*use rk pwm*/
	write32(&rk3288_grf->soc_con2, RK_SETBITS(1 << 0));

	write32(&rk3288_pwm->pwm[id].pwm_ctrl, PWM_SEL_SRC_CLK |
		PWM_OUTPUT_LEFT | PWM_LP_DISABLE | PWM_CONTINUOUS |
		PWM_DUTY_POSTIVE | PWM_INACTIVE_POSTIVE | RK_PWM_DISABLE);

	period = (PD_BUS_PCLK_HZ / 1000) * period_ns / USECS_PER_SEC;
	duty = (PD_BUS_PCLK_HZ / 1000) * duty_ns / USECS_PER_SEC;

	write32(&rk3288_pwm->pwm[id].pwm_period_hpr, period);
	write32(&rk3288_pwm->pwm[id].pwm_duty_lpr, duty);
	setbits_le32(&rk3288_pwm->pwm[id].pwm_ctrl, RK_PWM_ENABLE);
}