98 lines
2.3 KiB
C
98 lines
2.3 KiB
C
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/* Copyright 2014 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 IT83xx. */
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#ifndef __CROS_EC_PWM_CHIP_H
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#define __CROS_EC_PWM_CHIP_H
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enum pwm_pcfsr_sel {
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PWM_PRESCALER_C4 = 1,
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PWM_PRESCALER_C6 = 2,
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PWM_PRESCALER_C7 = 3,
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};
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enum pwm_hw_channel {
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PWM_HW_CH_DCR0 = 0,
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PWM_HW_CH_DCR1,
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PWM_HW_CH_DCR2,
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PWM_HW_CH_DCR3,
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PWM_HW_CH_DCR4,
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PWM_HW_CH_DCR5,
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PWM_HW_CH_DCR6,
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PWM_HW_CH_DCR7,
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PWM_HW_CH_TOTAL,
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};
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enum tach_ch_sel {
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/* Pin GPIOD.6 */
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TACH_CH_TACH0A = 0,
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/* Pin GPIOD.7 */
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TACH_CH_TACH1A,
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/* Pin GPIOJ.2 */
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TACH_CH_TACH0B,
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/* Pin GPIOJ.3 */
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TACH_CH_TACH1B,
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/* Number of TACH channels */
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TACH_CH_COUNT,
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TACH_CH_NULL = 0xFF,
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};
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/* Data structure to define PWM channel control registers. */
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struct pwm_ctrl_t {
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/* PWM channel output duty register. */
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volatile uint8_t *pwm_duty;
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/* PWM channel clock source selection register. */
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volatile uint8_t *pwm_clock_source;
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/* PWM channel pin control register. */
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volatile uint8_t *pwm_pin;
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};
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/* Data structure to define PWM channel control registers part 2. */
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struct pwm_ctrl_t2 {
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/* PWM cycle time register. */
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volatile uint8_t *pwm_cycle_time;
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/* PWM channel clock prescaler register (LSB). */
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volatile uint8_t *pwm_cpr_lsb;
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/* PWM channel clock prescaler register (MSB). */
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volatile uint8_t *pwm_cpr_msb;
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/* PWM prescaler clock frequency select register. */
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volatile uint8_t *pwm_pcfsr_reg;
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/* PWM prescaler clock frequency select register setting. */
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uint8_t pwm_pcfsr_ctrl;
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};
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/* Data structure to define PWM channels. */
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struct pwm_t {
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/* PWM channel ID */
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int channel;
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/* PWM channel flags. See include/pwm.h */
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uint32_t flags;
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int freq_hz;
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enum pwm_pcfsr_sel pcfsr_sel;
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};
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/* Tachometer channel of each physical fan */
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struct fan_tach_t {
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enum tach_ch_sel ch_tach;
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/* the numbers of square pulses per revolution of fan. */
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int fan_p;
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/* allow actual rpm ~= targe rpm +- rpm_re */
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int rpm_re;
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/* startup duty of fan */
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int s_duty;
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};
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extern const struct pwm_t pwm_channels[];
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/* The list of tachometer channel of fans is instantiated in board.c. */
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extern const struct fan_tach_t fan_tach[];
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void pwm_duty_inc(enum pwm_channel ch);
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void pwm_duty_reduce(enum pwm_channel ch);
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#endif /* __CROS_EC_PWM_CHIP_H */
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