/* * 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 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 IS_ENABLED(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); }