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/*
* 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 <device/mmio.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 rk_pwm_regs {
struct pwm_ctl pwm[4];
u32 intsts;
u32 int_en;
};
check_member(rk_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 rk_pwm_regs *rk_pwm = (void *)RK_PWM_BASE;
void pwm_init(u32 id, u32 period_ns, u32 duty_ns)
{
unsigned long period, duty;
#if CONFIG(SOC_ROCKCHIP_RK3288)
/*use rk pwm*/
write32(&rk3288_grf->soc_con2, RK_SETBITS(1 << 0));
#endif
write32(&rk_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 = (PWM_CLOCK_HZ / 1000) * period_ns / USECS_PER_SEC;
duty = (PWM_CLOCK_HZ / 1000) * duty_ns / USECS_PER_SEC;
write32(&rk_pwm->pwm[id].pwm_period_hpr, period);
write32(&rk_pwm->pwm[id].pwm_duty_lpr, duty);
setbits_le32(&rk_pwm->pwm[id].pwm_ctrl, RK_PWM_ENABLE);
}
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