86 lines
1.9 KiB
C
86 lines
1.9 KiB
C
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/* Copyright 2013 The Chromium OS Authors. All rights reserved.
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* Use of this source code is governed by a BSD-style license that can be
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* found in the LICENSE file.
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*/
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/* PWM control module for MEC1322 */
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#include "hooks.h"
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#include "pwm.h"
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#include "pwm_chip.h"
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#include "registers.h"
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#include "util.h"
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/*
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* PWMs that must remain active in low-power idle - MEC1322_PCR_EC_SLP_EN
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* bit mask.
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*/
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static uint32_t pwm_keep_awake_mask;
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void pwm_enable(enum pwm_channel ch, int enabled)
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{
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int id = pwm_channels[ch].channel;
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if (enabled) {
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MEC1322_PWM_CFG(id) |= 0x1;
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if (pwm_channels[ch].flags & PWM_CONFIG_DSLEEP)
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pwm_keep_awake_mask |=
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MEC1322_PCR_EC_SLP_EN_PWM(id);
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} else {
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MEC1322_PWM_CFG(id) &= ~0x1;
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pwm_keep_awake_mask &= ~MEC1322_PCR_EC_SLP_EN_PWM(id);
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}
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}
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int pwm_get_enabled(enum pwm_channel ch)
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{
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return MEC1322_PWM_CFG(pwm_channels[ch].channel) & 0x1;
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}
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void pwm_set_duty(enum pwm_channel ch, int percent)
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{
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int id = pwm_channels[ch].channel;
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if (percent < 0)
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percent = 0;
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else if (percent > 100)
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percent = 100;
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MEC1322_PWM_ON(id) = percent;
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MEC1322_PWM_OFF(id) = 100 - percent;
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}
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int pwm_get_duty(enum pwm_channel ch)
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{
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return MEC1322_PWM_ON(pwm_channels[ch].channel);
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}
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uint32_t pwm_get_keep_awake_mask(void)
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{
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return pwm_keep_awake_mask;
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}
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static void pwm_configure(int ch, int active_low, int clock_low)
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{
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/*
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* clock_low=0 selects the 48MHz Ring Oscillator source
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* clock_low=1 selects the 100kHz_Clk source
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*/
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MEC1322_PWM_CFG(ch) = (15 << 3) | /* Pre-divider = 16 */
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(active_low ? BIT(2) : 0) |
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(clock_low ? BIT(1) : 0);
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}
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static void pwm_init(void)
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{
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int i;
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for (i = 0; i < PWM_CH_COUNT; ++i) {
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pwm_configure(pwm_channels[i].channel,
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pwm_channels[i].flags & PWM_CONFIG_ACTIVE_LOW,
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pwm_channels[i].flags & PWM_CONFIG_ALT_CLOCK);
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pwm_set_duty(i, 0);
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}
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}
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DECLARE_HOOK(HOOK_INIT, pwm_init, HOOK_PRIO_INIT_PWM);
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