diff options
Diffstat (limited to 'chip/lm4/pwm.c')
| -rw-r--r-- | chip/lm4/pwm.c | 89 |
1 files changed, 20 insertions, 69 deletions
diff --git a/chip/lm4/pwm.c b/chip/lm4/pwm.c index 6e52ebb369..943aa0210f 100644 --- a/chip/lm4/pwm.c +++ b/chip/lm4/pwm.c @@ -3,9 +3,13 @@ * found in the LICENSE file. */ -/* PWM control module for LM4 */ +/* PWM control module for LM4. + * + * On this chip, the PWM logic is implemented by the hardware FAN modules. + */ #include "clock.h" +#include "fan_chip.h" #include "gpio.h" #include "hooks.h" #include "pwm.h" @@ -13,58 +17,39 @@ #include "registers.h" #include "util.h" -/* Maximum RPM for PWM controller */ -#define MAX_RPM 0x1fff - -/* Maximum PWM for PWM controller */ -#define MAX_PWM 0x1ff - -#define RPM_SCALE 2 - void pwm_enable(enum pwm_channel ch, int enabled) { - const struct pwm_t *pwm = pwm_channels + ch; - if (enabled) - LM4_FAN_FANCTL |= (1 << pwm->channel); - else - LM4_FAN_FANCTL &= ~(1 << pwm->channel); + fan_chip_set_enabled(pwm_channels[ch].channel, enabled); } int pwm_get_enabled(enum pwm_channel ch) { - const struct pwm_t *pwm = pwm_channels + ch; - return (LM4_FAN_FANCTL & (1 << pwm->channel)) ? 1 : 0; + return fan_chip_get_enabled(pwm_channels[ch].channel); } void pwm_set_duty(enum pwm_channel ch, int percent) { - const struct pwm_t *pwm = pwm_channels + ch; - int duty; - if (percent < 0) percent = 0; else if (percent > 100) percent = 100; - if (pwm->flags & PWM_CONFIG_ACTIVE_LOW) + /* Assume the fan control is active high and invert it ourselves */ + if (pwm_channels[ch].flags & PWM_CONFIG_ACTIVE_LOW) percent = 100 - percent; - duty = (MAX_PWM * percent + 50) / 100; - /* Always enable the channel */ pwm_enable(ch, 1); /* Set the duty cycle */ - LM4_FAN_FANCMD(pwm->channel) = duty << 16; + fan_chip_set_duty(pwm_channels[ch].channel, percent); } int pwm_get_duty(enum pwm_channel ch) { - const struct pwm_t *pwm = pwm_channels + ch; - int percent = ((LM4_FAN_FANCMD(pwm->channel) >> 16) * 100 + MAX_PWM / 2) - / MAX_PWM; + int percent = fan_chip_get_duty(pwm_channels[ch].channel); - if (pwm->flags & PWM_CONFIG_ACTIVE_LOW) + if (pwm_channels[ch].flags & PWM_CONFIG_ACTIVE_LOW) percent = 100 - percent; return percent; @@ -73,47 +58,13 @@ int pwm_get_duty(enum pwm_channel ch) static void pwm_init(void) { int i; - const struct pwm_t *pwm; - - /* Enable the fan module and delay a few clocks */ - clock_enable_peripheral(CGC_OFFSET_FAN, 0x1, - CGC_MODE_RUN | CGC_MODE_SLEEP); - - /* Disable all fans */ - LM4_FAN_FANCTL = 0; - for (i = 0; i < PWM_CH_COUNT; ++i) { - pwm = pwm_channels + i; - - if (pwm->flags & PWM_CONFIG_HAS_RPM_MODE) { - /* - * Configure PWM: - * 0x8000 = bit 15 = auto-restart - * 0x0000 = bit 14 = slow acceleration - * 0x0000 = bits 13:11 = no hysteresis - * 0x0000 = bits 10:8 = start period (2<<0) edges - * 0x0000 = bits 7:6 = no fast start - * 0x0020 = bits 5:4 = average 4 edges when - * calculating RPM - * 0x000c = bits 3:2 = 8 pulses per revolution - * (see note at top of file) - * 0x0000 = bit 0 = automatic control - */ - LM4_FAN_FANCH(pwm->channel) = 0x802c; - } else { - /* - * Configure keyboard backlight: - * 0x0000 = bit 15 = no auto-restart - * 0x0000 = bit 14 = slow acceleration - * 0x0000 = bits 13:11 = no hysteresis - * 0x0000 = bits 10:8 = start period (2<<0) edges - * 0x0000 = bits 7:6 = no fast start - * 0x0000 = bits 5:4 = no RPM averaging - * 0x0000 = bits 3:2 = 1 pulses per revolution - * 0x0001 = bit 0 = manual control - */ - LM4_FAN_FANCH(pwm->channel) = 0x0001; - } - } + for (i = 0; i < PWM_CH_COUNT; ++i) + fan_chip_channel_setup(pwm_channels[i].channel, + (pwm_channels[i].flags & + PWM_CONFIG_HAS_RPM_MODE) + ? FAN_CHIP_USE_RPM_MODE : 0); } -DECLARE_HOOK(HOOK_INIT, pwm_init, HOOK_PRIO_INIT_PWM); + +/* The chip-specific fan module initializes before this. */ +DECLARE_HOOK(HOOK_INIT, pwm_init, HOOK_PRIO_DEFAULT); |