diff options
Diffstat (limited to 'chip/mchp/fan.c')
| -rw-r--r-- | chip/mchp/fan.c | 175 |
1 files changed, 0 insertions, 175 deletions
diff --git a/chip/mchp/fan.c b/chip/mchp/fan.c deleted file mode 100644 index 17b60b703d..0000000000 --- a/chip/mchp/fan.c +++ /dev/null @@ -1,175 +0,0 @@ -/* Copyright 2017 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. - */ - -/* MCHP MEC fan control module. */ - -/* This assumes 2-pole fan. For each rotation, 5 edges are measured. */ - -#include "fan.h" -#include "registers.h" -#include "util.h" -#include "tfdp_chip.h" - -/* Maximum fan driver setting value */ -#define MAX_FAN_DRIVER_SETTING 0x3ff - -/* Fan driver setting data in bit[15:6] of hardware register */ -#define FAN_DRIVER_SETTING_SHIFT 6 - -/* Maximum tach reading/target value */ -#define MAX_TACH 0x1fff - -/* Tach target value for disable fan */ -#define FAN_OFF_TACH 0xfff8 - -/* - * RPM = (n - 1) * m * f * 60 / poles / TACH - * n = number of edges = 5 - * m = multiplier defined by RANGE = 2 in our case - * f = 32.768K - * poles = 2 - */ -#define RPM_TO_TACH(rpm) MIN((7864320 / MAX((rpm), 1)), MAX_TACH) -#define TACH_TO_RPM(tach) (7864320 / MAX((tach), 1)) - -static int rpm_setting; -static int duty_setting; -static int in_rpm_mode = 1; - - -static void clear_status(void) -{ - /* Clear DRIVE_FAIL, FAN_SPIN, and FAN_STALL bits */ - MCHP_FAN_STATUS(0) = 0x23; -} - -void fan_set_enabled(int ch, int enabled) -{ - if (in_rpm_mode) { - if (enabled) - fan_set_rpm_target(ch, rpm_setting); - else - MCHP_FAN_TARGET(0) = FAN_OFF_TACH; - } else { - if (enabled) - fan_set_duty(ch, duty_setting); - else - MCHP_FAN_SETTING(0) = 0; - } - clear_status(); -} - -int fan_get_enabled(int ch) -{ - if (in_rpm_mode) - return (MCHP_FAN_TARGET(0) & 0xff00) != 0xff00; - else - return !!MCHP_FAN_SETTING(0); -} - -void fan_set_duty(int ch, int percent) -{ - if (percent < 0) - percent = 0; - else if (percent > 100) - percent = 100; - - duty_setting = percent; - MCHP_FAN_SETTING(0) = (percent * MAX_FAN_DRIVER_SETTING / 100) - << FAN_DRIVER_SETTING_SHIFT; - clear_status(); -} - -int fan_get_duty(int ch) -{ - duty_setting = (MCHP_FAN_SETTING(0) >> FAN_DRIVER_SETTING_SHIFT) - * 100 / MAX_FAN_DRIVER_SETTING; - return duty_setting; -} - -int fan_get_rpm_mode(int ch) -{ - return !!(MCHP_FAN_CFG1(0) & BIT(7)); -} - -void fan_set_rpm_mode(int ch, int rpm_mode) -{ - if (rpm_mode) - MCHP_FAN_CFG1(0) |= BIT(7); - else - MCHP_FAN_CFG1(0) &= ~BIT(7); - clear_status(); -} - -int fan_get_rpm_actual(int ch) -{ - if ((MCHP_FAN_READING(0) >> 8) == 0xff) - return 0; - else - return TACH_TO_RPM(MCHP_FAN_READING(0) >> 3); -} - -int fan_get_rpm_target(int ch) -{ - return rpm_setting; -} - -void fan_set_rpm_target(int ch, int rpm) -{ - rpm_setting = rpm; - MCHP_FAN_TARGET(0) = RPM_TO_TACH(rpm) << 3; - clear_status(); -} - -enum fan_status fan_get_status(int ch) -{ - uint8_t sts = MCHP_FAN_STATUS(0); - - if (sts & (BIT(5) | BIT(1))) - return FAN_STATUS_FRUSTRATED; - if (fan_get_rpm_actual(ch) == 0) - return FAN_STATUS_STOPPED; - return FAN_STATUS_LOCKED; -} - -int fan_is_stalled(int ch) -{ - uint8_t sts = MCHP_FAN_STATUS(0); - - if (fan_get_rpm_actual(ch)) { - MCHP_FAN_STATUS(0) = 0x1; - return 0; - } - return sts & 0x1; -} - -void fan_channel_setup(int ch, unsigned int flags) -{ - /* Clear PCR sleep enable for RPM2FAN0 */ - MCHP_PCR_SLP_DIS_DEV(MCHP_PCR_RPMPWM0); - /* Configure PWM Min drive */ - MCHP_FAN_MIN_DRV(0) = 0x0A; - /* - * Fan configuration 1 register: - * 0x80 = bit 7 = RPM mode (0x00 if FAN_USE_RPM_MODE not set) - * 0x20 = bits 6:5 = min 1000 RPM, multiplier = 2 - * 0x08 = bits 4:3 = 5 edges, 2 poles - * 0x03 = bits 2:0 = 400 ms update time - * - * Fan configuration 2 register: - * 0x00 = bit 7 = Ramp control disabled - * 0x00 = bit 6 = Glitch filter enabled - * 0x30 = bits 5:4 = Using both derivative options - * 0x04 = bits 3:2 = error range is 50 RPM - * 0x00 = bits 1 = normal polarity - * 0x00 = bit 0 = Reserved - */ - if (flags & FAN_USE_RPM_MODE) - MCHP_FAN_CFG1(0) = 0xab; - else - MCHP_FAN_CFG1(0) = 0x2b; - MCHP_FAN_CFG2(0) = 0x34; - clear_status(); -} |