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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.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
*/
#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*/
writel(RK_SETBITS(1 << 0), &rk3288_grf->soc_con2);
writel(PWM_SEL_SRC_CLK | PWM_OUTPUT_LEFT | PWM_LP_DISABLE |
PWM_CONTINUOUS | PWM_DUTY_POSTIVE | PWM_INACTIVE_POSTIVE |
RK_PWM_DISABLE,
&rk3288_pwm->pwm[id].pwm_ctrl);
period = (PD_BUS_PCLK_HZ / 1000) * period_ns / USECS_PER_SEC;
duty = (PD_BUS_PCLK_HZ / 1000) * duty_ns / USECS_PER_SEC;
writel(period, &rk3288_pwm->pwm[id].pwm_period_hpr);
writel(duty, &rk3288_pwm->pwm[id].pwm_duty_lpr);
setbits_le32(&rk3288_pwm->pwm[id].pwm_ctrl, RK_PWM_ENABLE);
}
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