diff options
Diffstat (limited to 'chip/lm4/fan.c')
| -rw-r--r-- | chip/lm4/fan.c | 192 |
1 files changed, 0 insertions, 192 deletions
diff --git a/chip/lm4/fan.c b/chip/lm4/fan.c deleted file mode 100644 index b09323a37b..0000000000 --- a/chip/lm4/fan.c +++ /dev/null @@ -1,192 +0,0 @@ -/* Copyright 2013 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. - */ - -/* LM4 fan control module. */ - -#include "clock.h" -#include "fan.h" -#include "gpio.h" -#include "hooks.h" -#include "registers.h" -#include "util.h" - -/* Maximum RPM for fan controller */ -#define MAX_RPM 0x1fff - -/* Maximum PWM for PWM controller */ -#define MAX_PWM 0x1ff - -/* - * Scaling factor for requested/actual RPM for CPU fan. We need this because - * the fan controller on Blizzard filters tach pulses that are less than 64 - * 15625Hz ticks apart, which works out to ~7000rpm on an unscaled fan. By - * telling the controller we actually have twice as many edges per revolution, - * the controller can handle fans that actually go twice as fast. See - * crosbug.com/p/7718. - */ -#define RPM_SCALE 2 - - -void fan_set_enabled(int ch, int enabled) -{ - if (enabled) - LM4_FAN_FANCTL |= BIT(ch); - else - LM4_FAN_FANCTL &= ~BIT(ch); -} - -int fan_get_enabled(int ch) -{ - return (LM4_FAN_FANCTL & BIT(ch)) ? 1 : 0; -} - -void fan_set_duty(int ch, int percent) -{ - int duty; - - if (percent < 0) - percent = 0; - else if (percent > 100) - percent = 100; - - duty = (MAX_PWM * percent + 50) / 100; - - /* Always enable the channel */ - fan_set_enabled(ch, 1); - - /* Set the duty cycle */ - LM4_FAN_FANCMD(ch) = duty << 16; -} - -int fan_get_duty(int ch) -{ - return ((LM4_FAN_FANCMD(ch) >> 16) * 100 + MAX_PWM / 2) / MAX_PWM; -} - -int fan_get_rpm_mode(int ch) -{ - return (LM4_FAN_FANCH(ch) & 0x0001) ? 0 : 1; -} - -void fan_set_rpm_mode(int ch, int rpm_mode) -{ - int was_enabled = fan_get_enabled(ch); - int was_rpm = fan_get_rpm_mode(ch); - - if (!was_rpm && rpm_mode) { - /* Enable RPM control */ - fan_set_enabled(ch, 0); - LM4_FAN_FANCH(ch) &= ~0x0001; - fan_set_enabled(ch, was_enabled); - } else if (was_rpm && !rpm_mode) { - /* Disable RPM mode */ - fan_set_enabled(ch, 0); - LM4_FAN_FANCH(ch) |= 0x0001; - fan_set_enabled(ch, was_enabled); - } -} - -int fan_get_rpm_actual(int ch) -{ - return (LM4_FAN_FANCST(ch) & MAX_RPM) * RPM_SCALE; -} - -int fan_get_rpm_target(int ch) -{ - return (LM4_FAN_FANCMD(ch) & MAX_RPM) * RPM_SCALE; -} - -test_mockable void fan_set_rpm_target(int ch, int rpm) -{ - /* Apply fan scaling */ - if (rpm > 0) - rpm /= RPM_SCALE; - - /* Treat out-of-range requests as requests for maximum fan speed */ - if (rpm < 0 || rpm > MAX_RPM) - rpm = MAX_RPM; - - LM4_FAN_FANCMD(ch) = rpm; -} - -/* The LM4 status is the original definition of enum fan_status */ -enum fan_status fan_get_status(int ch) -{ - return (LM4_FAN_FANSTS >> (2 * ch)) & 0x03; -} - -/** - * Return non-zero if fan is enabled but stalled. - */ -int fan_is_stalled(int ch) -{ - /* Must be enabled with non-zero target to stall */ - if (!fan_get_enabled(ch) || fan_get_rpm_target(ch) == 0) - return 0; - - /* Check for stall condition */ - return fan_get_status(ch) == FAN_STATUS_STOPPED; -} - -void fan_channel_setup(int ch, unsigned int flags) -{ - uint32_t init; - - if (flags & FAN_USE_RPM_MODE) - /* - * Configure automatic/feedback mode: - * 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 - */ - init = 0x802c; - else - /* - * Configure drive-only mode: - * 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 - */ - init = 0x0001; - - if (flags & FAN_USE_FAST_START) - /* - * Configure fast-start mode - * 0x0000 = bits 10:8 = start period (2<<0) edges - * 0x0040 = bits 7:6 = fast start at 50% duty - */ - init |= 0x0040; - - LM4_FAN_FANCH(ch) = init; -} - -static void fan_init(void) -{ - -#ifdef CONFIG_FAN_DSLEEP - /* Enable the fan module and delay a few clocks */ - clock_enable_peripheral(CGC_OFFSET_FAN, 0x1, CGC_MODE_ALL); -#else - /* Enable the fan module and delay a few clocks */ - clock_enable_peripheral(CGC_OFFSET_FAN, 0x1, - CGC_MODE_RUN | CGC_MODE_SLEEP); -#endif - /* Disable all fans */ - LM4_FAN_FANCTL = 0; -} -/* Init before PWM */ -DECLARE_HOOK(HOOK_INIT, fan_init, HOOK_PRIO_INIT_FAN); |