LXR uboot/drivers/pwm/pwm-imx.c

   1/*
   2 * (C) Copyright 2014
   3 * Heiko Schocher, DENX Software Engineering, hs@denx.de.
   4 *
   5 * Basic support for the pwm module on imx6.
   6 *
   7 * SPDX-License-Identifier:     GPL-2.0+
   8 */
   9
  10#include <common.h>
  11#include <div64.h>
  12#include <pwm.h>
  13#include <asm/arch/imx-regs.h>
  14#include <asm/io.h>
  15#include "pwm-imx-util.h"
  16
  17int pwm_init(int pwm_id, int div, int invert)
  18{
  19        struct pwm_regs *pwm = (struct pwm_regs *)pwm_id_to_reg(pwm_id);
  20
  21        if (!pwm)
  22                return -1;
  23
  24        writel(0, &pwm->ir);
  25        return 0;
  26}
  27
  28int pwm_config(int pwm_id, int duty_ns, int period_ns)
  29{
  30        struct pwm_regs *pwm = (struct pwm_regs *)pwm_id_to_reg(pwm_id);
  31        unsigned long period_cycles, duty_cycles, prescale;
  32        u32 cr;
  33
  34        if (!pwm)
  35                return -1;
  36
  37        pwm_imx_get_parms(period_ns, duty_ns, &period_cycles, &duty_cycles,
  38                          &prescale);
  39
  40        cr = PWMCR_PRESCALER(prescale) |
  41                PWMCR_DOZEEN | PWMCR_WAITEN |
  42                PWMCR_DBGEN | PWMCR_CLKSRC_IPG_HIGH;
  43
  44        writel(cr, &pwm->cr);
  45        /* set duty cycles */
  46        writel(duty_cycles, &pwm->sar);
  47        /* set period cycles */
  48        writel(period_cycles, &pwm->pr);
  49        return 0;
  50}
  51
  52int pwm_enable(int pwm_id)
  53{
  54        struct pwm_regs *pwm = (struct pwm_regs *)pwm_id_to_reg(pwm_id);
  55
  56        if (!pwm)
  57                return -1;
  58
  59        setbits_le32(&pwm->cr, PWMCR_EN);
  60        return 0;
  61}
  62
  63void pwm_disable(int pwm_id)
  64{
  65        struct pwm_regs *pwm = (struct pwm_regs *)pwm_id_to_reg(pwm_id);
  66
  67        if (!pwm)
  68                return;
  69
  70        clrbits_le32(&pwm->cr, PWMCR_EN);
  71}
  72