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/* Copyright (c) 2013 The Chromium OS Authors. All rights reserved.
* Use of this source code is governed by a BSD-style license that can be
* found in the LICENSE file.
*/
/* PWM control module for MEC1322 */
#include "hooks.h"
#include "pwm.h"
#include "pwm_chip.h"
#include "registers.h"
#include "util.h"
void pwm_enable(enum pwm_channel ch, int enabled)
{
int id = pwm_channels[ch].channel;
if (enabled)
MEC1322_PWM_CFG(id) |= 0x1;
else
MEC1322_PWM_CFG(id) &= ~0x1;
}
int pwm_get_enabled(enum pwm_channel ch)
{
return MEC1322_PWM_CFG(pwm_channels[ch].channel) & 0x1;
}
void pwm_set_duty(enum pwm_channel ch, int percent)
{
int id = pwm_channels[ch].channel;
if (percent < 0)
percent = 0;
else if (percent > 100)
percent = 100;
MEC1322_PWM_ON(id) = percent;
MEC1322_PWM_OFF(id) = 100 - percent;
}
int pwm_get_duty(enum pwm_channel ch)
{
return MEC1322_PWM_ON(pwm_channels[ch].channel);
}
static void pwm_configure(int ch, int active_low, int clock_low)
{
/*
* clock_low=0 selects the 48MHz Ring Oscillator source
* clock_low=1 selects the 100kHz_Clk source
*/
MEC1322_PWM_CFG(ch) = (15 << 3) | /* Pre-divider = 16 */
(active_low ? (1 << 2) : 0) |
(clock_low ? (1 << 1) : 0);
}
static void pwm_init(void)
{
int i;
for (i = 0; i < PWM_CH_COUNT; ++i) {
pwm_configure(pwm_channels[i].channel,
pwm_channels[i].flags & PWM_CONFIG_ACTIVE_LOW,
pwm_channels[i].flags & PWM_CONFIG_ALT_CLOCK);
pwm_set_duty(i, 0);
}
}
DECLARE_HOOK(HOOK_INIT, pwm_init, HOOK_PRIO_DEFAULT);
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