| /* |
| * 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 <assert.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 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); |
| } |