forked from rrcarlosr/Jetpack
72 lines
1.3 KiB
C
72 lines
1.3 KiB
C
/*
|
|
* (C) Copyright 2014
|
|
* Heiko Schocher, DENX Software Engineering, hs@denx.de.
|
|
*
|
|
* Basic support for the pwm modul on imx6.
|
|
*
|
|
* SPDX-License-Identifier: GPL-2.0+
|
|
*/
|
|
|
|
#include <common.h>
|
|
#include <div64.h>
|
|
#include <pwm.h>
|
|
#include <asm/arch/imx-regs.h>
|
|
#include <asm/io.h>
|
|
#include "pwm-imx-util.h"
|
|
|
|
int pwm_init(int pwm_id, int div, int invert)
|
|
{
|
|
struct pwm_regs *pwm = (struct pwm_regs *)pwm_id_to_reg(pwm_id);
|
|
|
|
if (!pwm)
|
|
return -1;
|
|
|
|
writel(0, &pwm->ir);
|
|
return 0;
|
|
}
|
|
|
|
int pwm_config(int pwm_id, int duty_ns, int period_ns)
|
|
{
|
|
struct pwm_regs *pwm = (struct pwm_regs *)pwm_id_to_reg(pwm_id);
|
|
unsigned long period_cycles, duty_cycles, prescale;
|
|
u32 cr;
|
|
|
|
if (!pwm)
|
|
return -1;
|
|
|
|
pwm_imx_get_parms(period_ns, duty_ns, &period_cycles, &duty_cycles,
|
|
&prescale);
|
|
|
|
cr = PWMCR_PRESCALER(prescale) |
|
|
PWMCR_DOZEEN | PWMCR_WAITEN |
|
|
PWMCR_DBGEN | PWMCR_CLKSRC_IPG_HIGH;
|
|
|
|
writel(cr, &pwm->cr);
|
|
/* set duty cycles */
|
|
writel(duty_cycles, &pwm->sar);
|
|
/* set period cycles */
|
|
writel(period_cycles, &pwm->pr);
|
|
return 0;
|
|
}
|
|
|
|
int pwm_enable(int pwm_id)
|
|
{
|
|
struct pwm_regs *pwm = (struct pwm_regs *)pwm_id_to_reg(pwm_id);
|
|
|
|
if (!pwm)
|
|
return -1;
|
|
|
|
setbits_le32(&pwm->cr, PWMCR_EN);
|
|
return 0;
|
|
}
|
|
|
|
void pwm_disable(int pwm_id)
|
|
{
|
|
struct pwm_regs *pwm = (struct pwm_regs *)pwm_id_to_reg(pwm_id);
|
|
|
|
if (!pwm)
|
|
return;
|
|
|
|
clrbits_le32(&pwm->cr, PWMCR_EN);
|
|
}
|