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