diff options
Diffstat (limited to 'chip/npcx/pwm.c')
| -rw-r--r-- | chip/npcx/pwm.c | 251 |
1 files changed, 0 insertions, 251 deletions
diff --git a/chip/npcx/pwm.c b/chip/npcx/pwm.c deleted file mode 100644 index b2016906b3..0000000000 --- a/chip/npcx/pwm.c +++ /dev/null @@ -1,251 +0,0 @@ -/* 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 NPCX. - * - * On this chip, the PWM logic is implemented by the hardware FAN modules. - */ - -#include "assert.h" -#include "clock.h" -#include "clock_chip.h" -#include "console.h" -#include "ec_commands.h" -#include "gpio.h" -#include "hooks.h" -#include "pwm.h" -#include "pwm_chip.h" -#include "registers.h" -#include "util.h" - -#if !(DEBUG_PWM) -#define CPRINTS(...) -#else -#define CPRINTS(format, args...) cprints(CC_PWM, format, ## args) -#endif - -/* pwm resolution for each channel */ -static uint32_t pwm_res[PWM_CH_COUNT]; - -/* PWM clock source */ -enum npcx_pwm_source_clock { - NPCX_PWM_CLOCK_APB2_LFCLK = 0, - NPCX_PWM_CLOCK_FX = 1, - NPCX_PWM_CLOCK_FR = 2, - NPCX_PWM_CLOCK_RESERVED = 3, - NPCX_PWM_CLOCK_UNDEF = 0xFF -}; - -/* PWM heartbeat mode */ -enum npcx_pwm_heartbeat_mode { - NPCX_PWM_HBM_NORMAL = 0, - NPCX_PWM_HBM_25 = 1, - NPCX_PWM_HBM_50 = 2, - NPCX_PWM_HBM_100 = 3, - NPCX_PWM_HBM_UNDEF = 0xFF -}; - -/** - * Set PWM operation clock. - * - * @param ch operation channel - * @param freq desired PWM frequency - * @notes changed when initialization - */ -static void pwm_set_freq(enum pwm_channel ch, uint32_t freq) -{ - int mdl = pwm_channels[ch].channel; - uint32_t clock; - uint32_t pre; - - assert(freq != 0); - - /* Disable PWM for module configuration */ - pwm_enable(ch, 0); - - /* - * Get PWM clock frequency. Use internal 32K as PWM clock source if - * the PWM must be active during low-power idle. - */ - if (pwm_channels[ch].flags & PWM_CONFIG_DSLEEP) - clock = INT_32K_CLOCK; - else - clock = clock_get_apb2_freq(); - - /* Calculate prescaler */ - pre = DIV_ROUND_UP(clock, (0xffff * freq)); - - /* - * Calculate maximum resolution for the given freq. and prescaler. And - * prevent it exceed the resolution of CTR/DCR registers. - */ - pwm_res[ch] = MIN((clock / pre) / freq, NPCX_PWM_MAX_RAW_DUTY); - - /* Set PWM prescaler. */ - NPCX_PRSC(mdl) = pre - 1; - - /* Set PWM cycle time */ - NPCX_CTR(mdl) = pwm_res[ch]; - - /* Set the duty cycle to 100% since DCR == CTR */ - NPCX_DCR(mdl) = pwm_res[ch]; -} - -/** - * Set PWM enabled. - * - * @param ch operation channel - * @param enabled enabled flag - */ -void pwm_enable(enum pwm_channel ch, int enabled) -{ - int mdl = pwm_channels[ch].channel; - - /* Start or close PWM module */ - UPDATE_BIT(NPCX_PWMCTL(mdl), NPCX_PWMCTL_PWR, enabled); -} - -/** - * Check PWM enabled. - * - * @param ch operation channel - * @return enabled or not - */ -int pwm_get_enabled(enum pwm_channel ch) -{ - int mdl = pwm_channels[ch].channel; - return IS_BIT_SET(NPCX_PWMCTL(mdl), NPCX_PWMCTL_PWR); -} - -/** - * Set PWM duty cycle. - * - * @param ch operation channel - * @param percent duty cycle percent - */ -void pwm_set_duty(enum pwm_channel ch, int percent) -{ - /* Convert percent on [0, 100] to 16 bit duty */ - pwm_set_raw_duty(ch, (percent * EC_PWM_MAX_DUTY) / 100); -} - -/** - * Set PWM duty cycle. - * - * @param ch operation channel - * @param duty cycle duty - */ -void pwm_set_raw_duty(enum pwm_channel ch, uint16_t duty) -{ - int mdl = pwm_channels[ch].channel; - uint32_t sd; - - CPRINTS("pwm%d, set duty=%d", mdl, duty); - - /* Assume the fan control is active high and invert it ourselves */ - UPDATE_BIT(NPCX_PWMCTL(mdl), NPCX_PWMCTL_INVP, - (pwm_channels[ch].flags & PWM_CONFIG_ACTIVE_LOW)); - - CPRINTS("initial freq=0x%x", pwm_channels[ch].freq); - CPRINTS("duty_cycle_cnt=%d", duty); - - /* duty ranges from 0 - 0xffff, so scale down to 0 - pwm_res[ch] */ - sd = DIV_ROUND_NEAREST(duty * pwm_res[ch], EC_PWM_MAX_DUTY); - - /* Set the duty cycle. If it is zero, set DCR > CTR */ - NPCX_DCR(mdl) = sd ? sd : NPCX_PWM_MAX_RAW_DUTY + 1; -} - -/** - * Get PWM duty cycle. - * - * @param ch operation channel - * @return duty cycle percent - */ -int pwm_get_duty(enum pwm_channel ch) -{ - /* duty ranges from 0 - 0xffff, so scale to 0 - 100 */ - return DIV_ROUND_NEAREST(pwm_get_raw_duty(ch) * 100, EC_PWM_MAX_DUTY); -} - -/** - * Get PWM duty cycle. - * - * @param ch operation channel - * @return duty cycle - */ -uint16_t pwm_get_raw_duty(enum pwm_channel ch) -{ - int mdl = pwm_channels[ch].channel; - - /* Return duty */ - if (NPCX_DCR(mdl) > NPCX_CTR(mdl)) - return 0; - else - /* - * NPCX_DCR ranges from 0 - pwm_res[ch], - * so scale to 0 - 0xffff - */ - return DIV_ROUND_NEAREST(NPCX_DCR(mdl) * EC_PWM_MAX_DUTY, - pwm_res[ch]); -} - -/** - * PWM configuration. - * - * @param ch operation channel - */ -void pwm_config(enum pwm_channel ch) -{ - int mdl = pwm_channels[ch].channel; - - /* Disable PWM for module configuration */ - pwm_enable(ch, 0); - - /* Set PWM heartbeat mode is no heartbeat */ - SET_FIELD(NPCX_PWMCTL(mdl), NPCX_PWMCTL_HB_DC_CTL_FIELD, - NPCX_PWM_HBM_NORMAL); - - /* Select default CLK or LFCLK clock input to PWM module */ - SET_FIELD(NPCX_PWMCTLEX(mdl), NPCX_PWMCTLEX_FCK_SEL_FIELD, - NPCX_PWM_CLOCK_APB2_LFCLK); - - /* Set PWM polarity normal first */ - CLEAR_BIT(NPCX_PWMCTL(mdl), NPCX_PWMCTL_INVP); - - /* Select PWM clock source */ - UPDATE_BIT(NPCX_PWMCTL(mdl), NPCX_PWMCTL_CKSEL, - (pwm_channels[ch].flags & PWM_CONFIG_DSLEEP)); - - /* Select PWM IO type */ - UPDATE_BIT(NPCX_PWMCTLEX(mdl), NPCX_PWMCTLEX_OD_OUT, - (pwm_channels[ch].flags & PWM_CONFIG_OPEN_DRAIN)); - - /* Set PWM operation frequency */ - pwm_set_freq(ch, pwm_channels[ch].freq); -} - -/** - * PWM initial. - */ -static void pwm_init(void) -{ - int i; - uint8_t pd_mask = 0; - - /* Take enabled PWMs out of power-down state */ - for (i = 0; i < PWM_CH_COUNT; i++) { - pd_mask |= (1 << pwm_channels[i].channel); - pwm_res[i] = 0; - } - - clock_enable_peripheral(CGC_OFFSET_PWM, pd_mask, CGC_MODE_ALL); - - for (i = 0; i < PWM_CH_COUNT; i++) - pwm_config(i); -} - -/* The chip-specific fan module initializes before this. */ -DECLARE_HOOK(HOOK_INIT, pwm_init, HOOK_PRIO_INIT_PWM); |