diff options
Diffstat (limited to 'chip/lm4/fan.c')
-rw-r--r-- | chip/lm4/fan.c | 363 |
1 files changed, 107 insertions, 256 deletions
diff --git a/chip/lm4/fan.c b/chip/lm4/fan.c index e8a77c3e91..a342a49954 100644 --- a/chip/lm4/fan.c +++ b/chip/lm4/fan.c @@ -3,322 +3,173 @@ * found in the LICENSE file. */ -/* Chrome OS fan control */ +/* LM4 fan control module. */ #include "clock.h" -#include "common.h" -#include "console.h" #include "fan.h" -#include "fan_chip.h" #include "gpio.h" #include "hooks.h" -#include "host_command.h" -#include "pwm.h" #include "registers.h" -#include "system.h" -#include "task.h" -#include "timer.h" #include "util.h" -/* True if we're listening to the thermal control task. False if we're setting - * things manually. */ -static int thermal_control_enabled; +/* Maximum RPM for fan controller */ +#define MAX_RPM 0x1fff -static void fan_set_enabled(int enable) -{ - fan_chip_set_enabled(CONFIG_FAN_CH_CPU, enable); +/* Maximum PWM for PWM controller */ +#define MAX_PWM 0x1ff -#ifdef CONFIG_FAN_EN_GPIO - gpio_set_level(CONFIG_FAN_EN_GPIO, enable); -#endif /* CONFIG_FAN_EN_GPIO */ -} +/* + * 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 -static void fan_set_thermal_control_enabled(int enable) -{ - thermal_control_enabled = enable; - /* If controlling the fan, need it in RPM-control mode */ - if (enable) - fan_chip_channel_setup(CONFIG_FAN_CH_CPU, - FAN_CHIP_USE_RPM_MODE); +void fan_set_enabled(int ch, int enabled) +{ + if (enabled) + LM4_FAN_FANCTL |= (1 << ch); + else + LM4_FAN_FANCTL &= ~(1 << ch); } -/* The thermal task will only call this function with pct in [0,100]. */ -test_mockable void pwm_fan_set_percent_needed(int pct) +int fan_get_enabled(int ch) { - int rpm; - - if (!thermal_control_enabled) - return; - - rpm = pwm_fan_percent_to_rpm(pct); - - fan_chip_set_rpm_target(CONFIG_FAN_CH_CPU, rpm); + return (LM4_FAN_FANCTL & (1 << ch)) ? 1 : 0; } -static void fan_set_duty_cycle(int percent) +void fan_set_duty(int ch, int percent) { - /* Move the fan to manual control */ - fan_chip_set_rpm_mode(CONFIG_FAN_CH_CPU, 0); + int duty; + + if (percent < 0) + percent = 0; + else if (percent > 100) + percent = 100; - /* Always enable the fan */ - fan_set_enabled(1); + duty = (MAX_PWM * percent + 50) / 100; - /* Disable thermal engine automatic fan control. */ - fan_set_thermal_control_enabled(0); + /* Always enable the channel */ + fan_set_enabled(ch, 1); /* Set the duty cycle */ - fan_chip_set_duty(CONFIG_FAN_CH_CPU, percent); + LM4_FAN_FANCMD(ch) = duty << 16; } -/*****************************************************************************/ -/* Console commands */ - -static int cc_fanauto(int argc, char **argv) +int fan_get_duty(int ch) { - fan_set_thermal_control_enabled(1); - return EC_SUCCESS; + return ((LM4_FAN_FANCMD(ch) >> 16) * 100 + MAX_PWM / 2) / MAX_PWM; } -DECLARE_CONSOLE_COMMAND(fanauto, cc_fanauto, - NULL, - "Enable thermal fan control", - NULL); -static int cc_faninfo(int argc, char **argv) +int fan_get_rpm_mode(int ch) { - static const char * const human_status[] = { - "not spinning", "changing", "locked", "frustrated" - }; - int tmp; - - ccprintf("Actual: %4d rpm\n", - fan_chip_get_rpm_actual(CONFIG_FAN_CH_CPU)); - ccprintf("Target: %4d rpm\n", - fan_chip_get_rpm_target(CONFIG_FAN_CH_CPU)); - ccprintf("Duty: %d%%\n", - fan_chip_get_duty(CONFIG_FAN_CH_CPU)); - tmp = fan_chip_get_status(CONFIG_FAN_CH_CPU); - ccprintf("Status: %d (%s)\n", tmp, human_status[tmp]); - ccprintf("Mode: %s\n", - fan_chip_get_rpm_mode(CONFIG_FAN_CH_CPU) ? "rpm" : "duty"); - ccprintf("Auto: %s\n", thermal_control_enabled ? "yes" : "no"); - ccprintf("Enable: %s\n", - fan_chip_get_enabled(CONFIG_FAN_CH_CPU) ? "yes" : "no"); -#ifdef CONFIG_FAN_PGOOD_GPIO - ccprintf("Power: %s\n", -#ifdef CONFIG_FAN_EN_GPIO - gpio_get_level(CONFIG_FAN_EN_GPIO) && -#endif - gpio_get_level(CONFIG_FAN_PGOOD_GPIO) ? "yes" : "no"); -#endif - - - return EC_SUCCESS; + return (LM4_FAN_FANCH(ch) & 0x0001) ? 0 : 1; } -DECLARE_CONSOLE_COMMAND(faninfo, cc_faninfo, - NULL, - "Print fan info", - NULL); -static int cc_fanset(int argc, char **argv) +void fan_set_rpm_mode(int ch, int rpm_mode) { - int rpm; - char *e; + int was_enabled = fan_get_enabled(ch); + int was_rpm = fan_get_rpm_mode(ch); - if (argc < 2) - return EC_ERROR_PARAM_COUNT; - - rpm = strtoi(argv[1], &e, 0); - if (*e == '%') { /* Wait, that's a percentage */ - ccprintf("Fan rpm given as %d%%\n", rpm); - if (rpm < 0) - rpm = 0; - else if (rpm > 100) - rpm = 100; - rpm = pwm_fan_percent_to_rpm(rpm); - } else if (*e) { - return EC_ERROR_PARAM1; + 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); } - - /* Move the fan to automatic control */ - fan_chip_set_rpm_mode(CONFIG_FAN_CH_CPU, 1); - - /* Always enable the fan */ - fan_set_enabled(1); - - /* Disable thermal engine automatic fan control. */ - fan_set_thermal_control_enabled(0); - - fan_chip_set_rpm_target(CONFIG_FAN_CH_CPU, rpm); - - ccprintf("Setting fan rpm target to %d\n", rpm); - - return EC_SUCCESS; } -DECLARE_CONSOLE_COMMAND(fanset, cc_fanset, - "rpm | pct%", - "Set fan speed", - NULL); -static int cc_fanduty(int argc, char **argv) +int fan_get_rpm_actual(int ch) { - int percent = 0; - char *e; - - if (argc < 2) - return EC_ERROR_PARAM_COUNT; - - percent = strtoi(argv[1], &e, 0); - if (*e) - return EC_ERROR_PARAM1; - - ccprintf("Setting fan duty cycle to %d%%\n", percent); - fan_set_duty_cycle(percent); - - return EC_SUCCESS; + return (LM4_FAN_FANCST(ch) & MAX_RPM) * RPM_SCALE; } -DECLARE_CONSOLE_COMMAND(fanduty, cc_fanduty, - "percent", - "Set fan duty cycle", - NULL); - -/*****************************************************************************/ -/* Host commands */ -static int hc_pwm_get_fan_target_rpm(struct host_cmd_handler_args *args) +int fan_get_rpm_target(int ch) { - struct ec_response_pwm_get_fan_rpm *r = args->response; - - r->rpm = fan_chip_get_rpm_target(CONFIG_FAN_CH_CPU); - args->response_size = sizeof(*r); - - return EC_RES_SUCCESS; + return (LM4_FAN_FANCMD(ch) & MAX_RPM) * RPM_SCALE; } -DECLARE_HOST_COMMAND(EC_CMD_PWM_GET_FAN_TARGET_RPM, - hc_pwm_get_fan_target_rpm, - EC_VER_MASK(0)); -static int hc_pwm_set_fan_target_rpm(struct host_cmd_handler_args *args) +void fan_set_rpm_target(int ch, int rpm) { - const struct ec_params_pwm_set_fan_target_rpm *p = args->params; + /* Apply fan scaling */ + if (rpm > 0) + rpm /= RPM_SCALE; - fan_set_thermal_control_enabled(0); - fan_chip_set_rpm_mode(CONFIG_FAN_CH_CPU, 1); - fan_chip_set_rpm_target(CONFIG_FAN_CH_CPU, p->rpm); + /* Treat out-of-range requests as requests for maximum fan speed */ + if (rpm < 0 || rpm > MAX_RPM) + rpm = MAX_RPM; - return EC_RES_SUCCESS; + LM4_FAN_FANCMD(ch) = rpm; } -DECLARE_HOST_COMMAND(EC_CMD_PWM_SET_FAN_TARGET_RPM, - hc_pwm_set_fan_target_rpm, - EC_VER_MASK(0)); -static int hc_pwm_set_fan_duty(struct host_cmd_handler_args *args) +/* The LM4 status is the original definition of enum fan_status */ +enum fan_status fan_get_status(int ch) { - const struct ec_params_pwm_set_fan_duty *p = args->params; - fan_set_duty_cycle(p->percent); - - return EC_RES_SUCCESS; + return (LM4_FAN_FANSTS >> (2 * ch)) & 0x03; } -DECLARE_HOST_COMMAND(EC_CMD_PWM_SET_FAN_DUTY, - hc_pwm_set_fan_duty, - EC_VER_MASK(0)); - -static int hc_thermal_auto_fan_ctrl(struct host_cmd_handler_args *args) -{ - fan_set_thermal_control_enabled(1); - return EC_RES_SUCCESS; -} -DECLARE_HOST_COMMAND(EC_CMD_THERMAL_AUTO_FAN_CTRL, - hc_thermal_auto_fan_ctrl, - EC_VER_MASK(0)); - -/*****************************************************************************/ -/* Hooks */ - -#define PWMFAN_SYSJUMP_TAG 0x5046 /* "PF" */ -#define PWM_HOOK_VERSION 1 -/* Saved PWM state across sysjumps */ -struct pwm_fan_state { - uint16_t fan_rpm; - uint8_t fan_en; - char pad; /* Pad to multiple of 4 bytes. */ -}; - -static void pwm_fan_init(void) +/** + * Return non-zero if fan is enabled but stalled. + */ +int fan_is_stalled(int ch) { - const struct pwm_fan_state *prev; - uint16_t *mapped; - int version, size; - int i; + /* Must be enabled with non-zero target to stall */ + if (!fan_get_enabled(ch) || fan_get_rpm_target(ch) == 0) + return 0; - gpio_config_module(MODULE_PWM_FAN, 1); - - prev = (const struct pwm_fan_state *) - system_get_jump_tag(PWMFAN_SYSJUMP_TAG, &version, &size); - if (prev && version == PWM_HOOK_VERSION && size == sizeof(*prev)) { - /* Restore previous state. */ - fan_chip_set_enabled(CONFIG_FAN_CH_CPU, prev->fan_en); - fan_chip_set_rpm_target(CONFIG_FAN_CH_CPU, prev->fan_rpm); - } else { - /* Set initial fan speed to maximum */ - fan_chip_set_duty(CONFIG_FAN_CH_CPU, 100); - } - - fan_set_thermal_control_enabled(1); - - /* Initialize memory-mapped data */ - mapped = (uint16_t *)host_get_memmap(EC_MEMMAP_FAN); - for (i = 0; i < EC_FAN_SPEED_ENTRIES; i++) - mapped[i] = EC_FAN_SPEED_NOT_PRESENT; + /* Check for stall condition */ + return (((LM4_FAN_FANSTS >> (2 * ch)) & 0x03) == 0) ? 1 : 0; } -DECLARE_HOOK(HOOK_INIT, pwm_fan_init, HOOK_PRIO_DEFAULT + 1); -static void pwm_fan_second(void) +void fan_channel_setup(int ch, unsigned int flags) { - uint16_t *mapped = (uint16_t *)host_get_memmap(EC_MEMMAP_FAN); - - if (fan_chip_is_stalled(CONFIG_FAN_CH_CPU)) { - mapped[0] = EC_FAN_SPEED_STALLED; + if (flags & FAN_USE_RPM_MODE) { /* - * Issue warning. As we have thermal shutdown - * protection, issuing warning here should be enough. + * 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 */ - host_set_single_event(EC_HOST_EVENT_THERMAL); - cprintf(CC_PWM, "[%T Fan stalled!]\n"); + LM4_FAN_FANCH(ch) = 0x802c; } else { - mapped[0] = fan_chip_get_rpm_actual(CONFIG_FAN_CH_CPU); + /* + * 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 + */ + LM4_FAN_FANCH(ch) = 0x0001; } } -DECLARE_HOOK(HOOK_SECOND, pwm_fan_second, HOOK_PRIO_DEFAULT); - -static void pwm_fan_preserve_state(void) -{ - struct pwm_fan_state state; - - state.fan_en = fan_chip_get_enabled(CONFIG_FAN_CH_CPU); - state.fan_rpm = fan_chip_get_rpm_target(CONFIG_FAN_CH_CPU); - - system_add_jump_tag(PWMFAN_SYSJUMP_TAG, PWM_HOOK_VERSION, - sizeof(state), &state); -} -DECLARE_HOOK(HOOK_SYSJUMP, pwm_fan_preserve_state, HOOK_PRIO_DEFAULT); -static void pwm_fan_resume(void) +static void fan_init(void) { - fan_chip_set_enabled(CONFIG_FAN_CH_CPU, 1); -} -DECLARE_HOOK(HOOK_CHIPSET_RESUME, pwm_fan_resume, HOOK_PRIO_DEFAULT); + /* Enable the fan module and delay a few clocks */ + clock_enable_peripheral(CGC_OFFSET_FAN, 0x1, + CGC_MODE_RUN | CGC_MODE_SLEEP); -static void pwm_fan_S3_S5(void) -{ - /* Take back fan control when the processor shuts down */ - fan_set_thermal_control_enabled(1); - /* For now don't do anything with it. We'll have to turn it on again if - * we need active cooling during heavy battery charging or something. - */ - fan_chip_set_rpm_target(CONFIG_FAN_CH_CPU, 0); - fan_chip_set_enabled(CONFIG_FAN_CH_CPU, 0); /* crosbug.com/p/8097 */ + /* Disable all fans */ + LM4_FAN_FANCTL = 0; } -DECLARE_HOOK(HOOK_CHIPSET_SUSPEND, pwm_fan_S3_S5, HOOK_PRIO_DEFAULT); -DECLARE_HOOK(HOOK_CHIPSET_SHUTDOWN, pwm_fan_S3_S5, HOOK_PRIO_DEFAULT); +DECLARE_HOOK(HOOK_INIT, fan_init, HOOK_PRIO_INIT_PWM); |