| // SPDX-License-Identifier: GPL-2.0-only |
| /* |
| * Windfarm PowerMac thermal control. iMac G5 iSight |
| * |
| * (c) Copyright 2007 Étienne Bersac <bersace@gmail.com> |
| * |
| * Bits & pieces from windfarm_pm81.c by (c) Copyright 2005 Benjamin |
| * Herrenschmidt, IBM Corp. <benh@kernel.crashing.org> |
| * |
| * PowerMac12,1 |
| * ============ |
| * |
| * The algorithm used is the PID control algorithm, used the same way |
| * the published Darwin code does, using the same values that are |
| * present in the Darwin 8.10 snapshot property lists (note however |
| * that none of the code has been re-used, it's a complete |
| * re-implementation |
| * |
| * There is two models using PowerMac12,1. Model 2 is iMac G5 iSight |
| * 17" while Model 3 is iMac G5 20". They do have both the same |
| * controls with a tiny difference. The control-ids of hard-drive-fan |
| * and cpu-fan is swapped. |
| * |
| * Target Correction : |
| * |
| * controls have a target correction calculated as : |
| * |
| * new_min = ((((average_power * slope) >> 16) + offset) >> 16) + min_value |
| * new_value = max(new_value, max(new_min, 0)) |
| * |
| * OD Fan control correction. |
| * |
| * # model_id: 2 |
| * offset : -19563152 |
| * slope : 1956315 |
| * |
| * # model_id: 3 |
| * offset : -15650652 |
| * slope : 1565065 |
| * |
| * HD Fan control correction. |
| * |
| * # model_id: 2 |
| * offset : -15650652 |
| * slope : 1565065 |
| * |
| * # model_id: 3 |
| * offset : -19563152 |
| * slope : 1956315 |
| * |
| * CPU Fan control correction. |
| * |
| * # model_id: 2 |
| * offset : -25431900 |
| * slope : 2543190 |
| * |
| * # model_id: 3 |
| * offset : -15650652 |
| * slope : 1565065 |
| * |
| * Target rubber-banding : |
| * |
| * Some controls have a target correction which depends on another |
| * control value. The correction is computed in the following way : |
| * |
| * new_min = ref_value * slope + offset |
| * |
| * ref_value is the value of the reference control. If new_min is |
| * greater than 0, then we correct the target value using : |
| * |
| * new_target = max (new_target, new_min >> 16) |
| * |
| * # model_id : 2 |
| * control : cpu-fan |
| * ref : optical-drive-fan |
| * offset : -15650652 |
| * slope : 1565065 |
| * |
| * # model_id : 3 |
| * control : optical-drive-fan |
| * ref : hard-drive-fan |
| * offset : -32768000 |
| * slope : 65536 |
| * |
| * In order to have the moste efficient correction with those |
| * dependencies, we must trigger HD loop before OD loop before CPU |
| * loop. |
| * |
| * The various control loops found in Darwin config file are: |
| * |
| * HD Fan control loop. |
| * |
| * # model_id: 2 |
| * control : hard-drive-fan |
| * sensor : hard-drive-temp |
| * PID params : G_d = 0x00000000 |
| * G_p = 0x002D70A3 |
| * G_r = 0x00019999 |
| * History = 2 entries |
| * Input target = 0x370000 |
| * Interval = 5s |
| * |
| * # model_id: 3 |
| * control : hard-drive-fan |
| * sensor : hard-drive-temp |
| * PID params : G_d = 0x00000000 |
| * G_p = 0x002170A3 |
| * G_r = 0x00019999 |
| * History = 2 entries |
| * Input target = 0x370000 |
| * Interval = 5s |
| * |
| * OD Fan control loop. |
| * |
| * # model_id: 2 |
| * control : optical-drive-fan |
| * sensor : optical-drive-temp |
| * PID params : G_d = 0x00000000 |
| * G_p = 0x001FAE14 |
| * G_r = 0x00019999 |
| * History = 2 entries |
| * Input target = 0x320000 |
| * Interval = 5s |
| * |
| * # model_id: 3 |
| * control : optical-drive-fan |
| * sensor : optical-drive-temp |
| * PID params : G_d = 0x00000000 |
| * G_p = 0x001FAE14 |
| * G_r = 0x00019999 |
| * History = 2 entries |
| * Input target = 0x320000 |
| * Interval = 5s |
| * |
| * GPU Fan control loop. |
| * |
| * # model_id: 2 |
| * control : hard-drive-fan |
| * sensor : gpu-temp |
| * PID params : G_d = 0x00000000 |
| * G_p = 0x002A6666 |
| * G_r = 0x00019999 |
| * History = 2 entries |
| * Input target = 0x5A0000 |
| * Interval = 5s |
| * |
| * # model_id: 3 |
| * control : cpu-fan |
| * sensor : gpu-temp |
| * PID params : G_d = 0x00000000 |
| * G_p = 0x0010CCCC |
| * G_r = 0x00019999 |
| * History = 2 entries |
| * Input target = 0x500000 |
| * Interval = 5s |
| * |
| * KODIAK (aka northbridge) Fan control loop. |
| * |
| * # model_id: 2 |
| * control : optical-drive-fan |
| * sensor : north-bridge-temp |
| * PID params : G_d = 0x00000000 |
| * G_p = 0x003BD70A |
| * G_r = 0x00019999 |
| * History = 2 entries |
| * Input target = 0x550000 |
| * Interval = 5s |
| * |
| * # model_id: 3 |
| * control : hard-drive-fan |
| * sensor : north-bridge-temp |
| * PID params : G_d = 0x00000000 |
| * G_p = 0x0030F5C2 |
| * G_r = 0x00019999 |
| * History = 2 entries |
| * Input target = 0x550000 |
| * Interval = 5s |
| * |
| * CPU Fan control loop. |
| * |
| * control : cpu-fan |
| * sensors : cpu-temp, cpu-power |
| * PID params : from SDB partition |
| * |
| * CPU Slew control loop. |
| * |
| * control : cpufreq-clamp |
| * sensor : cpu-temp |
| */ |
| |
| #undef DEBUG |
| |
| #include <linux/types.h> |
| #include <linux/errno.h> |
| #include <linux/kernel.h> |
| #include <linux/delay.h> |
| #include <linux/slab.h> |
| #include <linux/init.h> |
| #include <linux/spinlock.h> |
| #include <linux/wait.h> |
| #include <linux/kmod.h> |
| #include <linux/device.h> |
| #include <linux/platform_device.h> |
| #include <linux/of.h> |
| |
| #include <asm/machdep.h> |
| #include <asm/io.h> |
| #include <asm/sections.h> |
| #include <asm/smu.h> |
| |
| #include "windfarm.h" |
| #include "windfarm_pid.h" |
| |
| #define VERSION "0.3" |
| |
| static int pm121_mach_model; /* machine model id */ |
| |
| /* Controls & sensors */ |
| static struct wf_sensor *sensor_cpu_power; |
| static struct wf_sensor *sensor_cpu_temp; |
| static struct wf_sensor *sensor_cpu_voltage; |
| static struct wf_sensor *sensor_cpu_current; |
| static struct wf_sensor *sensor_gpu_temp; |
| static struct wf_sensor *sensor_north_bridge_temp; |
| static struct wf_sensor *sensor_hard_drive_temp; |
| static struct wf_sensor *sensor_optical_drive_temp; |
| static struct wf_sensor *sensor_incoming_air_temp; /* unused ! */ |
| |
| enum { |
| FAN_CPU, |
| FAN_HD, |
| FAN_OD, |
| CPUFREQ, |
| N_CONTROLS |
| }; |
| static struct wf_control *controls[N_CONTROLS] = {}; |
| |
| /* Set to kick the control loop into life */ |
| static int pm121_all_controls_ok, pm121_all_sensors_ok; |
| static bool pm121_started; |
| |
| enum { |
| FAILURE_FAN = 1 << 0, |
| FAILURE_SENSOR = 1 << 1, |
| FAILURE_OVERTEMP = 1 << 2 |
| }; |
| |
| /* All sys loops. Note the HD before the OD loop in order to have it |
| run before. */ |
| enum { |
| LOOP_GPU, /* control = hd or cpu, but luckily, |
| it doesn't matter */ |
| LOOP_HD, /* control = hd */ |
| LOOP_KODIAK, /* control = hd or od */ |
| LOOP_OD, /* control = od */ |
| N_LOOPS |
| }; |
| |
| static const char *loop_names[N_LOOPS] = { |
| "GPU", |
| "HD", |
| "KODIAK", |
| "OD", |
| }; |
| |
| #define PM121_NUM_CONFIGS 2 |
| |
| static unsigned int pm121_failure_state; |
| static int pm121_readjust, pm121_skipping; |
| static bool pm121_overtemp; |
| static s32 average_power; |
| |
| struct pm121_correction { |
| int offset; |
| int slope; |
| }; |
| |
| static struct pm121_correction corrections[N_CONTROLS][PM121_NUM_CONFIGS] = { |
| /* FAN_OD */ |
| { |
| /* MODEL 2 */ |
| { .offset = -19563152, |
| .slope = 1956315 |
| }, |
| /* MODEL 3 */ |
| { .offset = -15650652, |
| .slope = 1565065 |
| }, |
| }, |
| /* FAN_HD */ |
| { |
| /* MODEL 2 */ |
| { .offset = -15650652, |
| .slope = 1565065 |
| }, |
| /* MODEL 3 */ |
| { .offset = -19563152, |
| .slope = 1956315 |
| }, |
| }, |
| /* FAN_CPU */ |
| { |
| /* MODEL 2 */ |
| { .offset = -25431900, |
| .slope = 2543190 |
| }, |
| /* MODEL 3 */ |
| { .offset = -15650652, |
| .slope = 1565065 |
| }, |
| }, |
| /* CPUFREQ has no correction (and is not implemented at all) */ |
| }; |
| |
| struct pm121_connection { |
| unsigned int control_id; |
| unsigned int ref_id; |
| struct pm121_correction correction; |
| }; |
| |
| static struct pm121_connection pm121_connections[] = { |
| /* MODEL 2 */ |
| { .control_id = FAN_CPU, |
| .ref_id = FAN_OD, |
| { .offset = -32768000, |
| .slope = 65536 |
| } |
| }, |
| /* MODEL 3 */ |
| { .control_id = FAN_OD, |
| .ref_id = FAN_HD, |
| { .offset = -32768000, |
| .slope = 65536 |
| } |
| }, |
| }; |
| |
| /* pointer to the current model connection */ |
| static struct pm121_connection *pm121_connection; |
| |
| /* |
| * ****** System Fans Control Loop ****** |
| * |
| */ |
| |
| /* Since each loop handles only one control and we want to avoid |
| * writing virtual control, we store the control correction with the |
| * loop params. Some data are not set, there are common to all loop |
| * and thus, hardcoded. |
| */ |
| struct pm121_sys_param { |
| /* purely informative since we use mach_model-2 as index */ |
| int model_id; |
| struct wf_sensor **sensor; /* use sensor_id instead ? */ |
| s32 gp, itarget; |
| unsigned int control_id; |
| }; |
| |
| static struct pm121_sys_param |
| pm121_sys_all_params[N_LOOPS][PM121_NUM_CONFIGS] = { |
| /* GPU Fan control loop */ |
| { |
| { .model_id = 2, |
| .sensor = &sensor_gpu_temp, |
| .gp = 0x002A6666, |
| .itarget = 0x5A0000, |
| .control_id = FAN_HD, |
| }, |
| { .model_id = 3, |
| .sensor = &sensor_gpu_temp, |
| .gp = 0x0010CCCC, |
| .itarget = 0x500000, |
| .control_id = FAN_CPU, |
| }, |
| }, |
| /* HD Fan control loop */ |
| { |
| { .model_id = 2, |
| .sensor = &sensor_hard_drive_temp, |
| .gp = 0x002D70A3, |
| .itarget = 0x370000, |
| .control_id = FAN_HD, |
| }, |
| { .model_id = 3, |
| .sensor = &sensor_hard_drive_temp, |
| .gp = 0x002170A3, |
| .itarget = 0x370000, |
| .control_id = FAN_HD, |
| }, |
| }, |
| /* KODIAK Fan control loop */ |
| { |
| { .model_id = 2, |
| .sensor = &sensor_north_bridge_temp, |
| .gp = 0x003BD70A, |
| .itarget = 0x550000, |
| .control_id = FAN_OD, |
| }, |
| { .model_id = 3, |
| .sensor = &sensor_north_bridge_temp, |
| .gp = 0x0030F5C2, |
| .itarget = 0x550000, |
| .control_id = FAN_HD, |
| }, |
| }, |
| /* OD Fan control loop */ |
| { |
| { .model_id = 2, |
| .sensor = &sensor_optical_drive_temp, |
| .gp = 0x001FAE14, |
| .itarget = 0x320000, |
| .control_id = FAN_OD, |
| }, |
| { .model_id = 3, |
| .sensor = &sensor_optical_drive_temp, |
| .gp = 0x001FAE14, |
| .itarget = 0x320000, |
| .control_id = FAN_OD, |
| }, |
| }, |
| }; |
| |
| /* the hardcoded values */ |
| #define PM121_SYS_GD 0x00000000 |
| #define PM121_SYS_GR 0x00019999 |
| #define PM121_SYS_HISTORY_SIZE 2 |
| #define PM121_SYS_INTERVAL 5 |
| |
| /* State data used by the system fans control loop |
| */ |
| struct pm121_sys_state { |
| int ticks; |
| s32 setpoint; |
| struct wf_pid_state pid; |
| }; |
| |
| static struct pm121_sys_state *pm121_sys_state[N_LOOPS] = {}; |
| |
| /* |
| * ****** CPU Fans Control Loop ****** |
| * |
| */ |
| |
| #define PM121_CPU_INTERVAL 1 |
| |
| /* State data used by the cpu fans control loop |
| */ |
| struct pm121_cpu_state { |
| int ticks; |
| s32 setpoint; |
| struct wf_cpu_pid_state pid; |
| }; |
| |
| static struct pm121_cpu_state *pm121_cpu_state; |
| |
| |
| |
| /* |
| * ***** Implementation ***** |
| * |
| */ |
| |
| /* correction the value using the output-low-bound correction algo */ |
| static s32 pm121_correct(s32 new_setpoint, |
| unsigned int control_id, |
| s32 min) |
| { |
| s32 new_min; |
| struct pm121_correction *correction; |
| correction = &corrections[control_id][pm121_mach_model - 2]; |
| |
| new_min = (average_power * correction->slope) >> 16; |
| new_min += correction->offset; |
| new_min = (new_min >> 16) + min; |
| |
| return max3(new_setpoint, new_min, 0); |
| } |
| |
| static s32 pm121_connect(unsigned int control_id, s32 setpoint) |
| { |
| s32 new_min, value, new_setpoint; |
| |
| if (pm121_connection->control_id == control_id) { |
| controls[control_id]->ops->get_value(controls[control_id], |
| &value); |
| new_min = value * pm121_connection->correction.slope; |
| new_min += pm121_connection->correction.offset; |
| if (new_min > 0) { |
| new_setpoint = max(setpoint, (new_min >> 16)); |
| if (new_setpoint != setpoint) { |
| pr_debug("pm121: %s depending on %s, " |
| "corrected from %d to %d RPM\n", |
| controls[control_id]->name, |
| controls[pm121_connection->ref_id]->name, |
| (int) setpoint, (int) new_setpoint); |
| } |
| } else |
| new_setpoint = setpoint; |
| } |
| /* no connection */ |
| else |
| new_setpoint = setpoint; |
| |
| return new_setpoint; |
| } |
| |
| /* FAN LOOPS */ |
| static void pm121_create_sys_fans(int loop_id) |
| { |
| struct pm121_sys_param *param = NULL; |
| struct wf_pid_param pid_param; |
| struct wf_control *control = NULL; |
| int i; |
| |
| /* First, locate the params for this model */ |
| for (i = 0; i < PM121_NUM_CONFIGS; i++) { |
| if (pm121_sys_all_params[loop_id][i].model_id == pm121_mach_model) { |
| param = &(pm121_sys_all_params[loop_id][i]); |
| break; |
| } |
| } |
| |
| /* No params found, put fans to max */ |
| if (param == NULL) { |
| printk(KERN_WARNING "pm121: %s fan config not found " |
| " for this machine model\n", |
| loop_names[loop_id]); |
| goto fail; |
| } |
| |
| control = controls[param->control_id]; |
| |
| /* Alloc & initialize state */ |
| pm121_sys_state[loop_id] = kmalloc(sizeof(struct pm121_sys_state), |
| GFP_KERNEL); |
| if (pm121_sys_state[loop_id] == NULL) { |
| printk(KERN_WARNING "pm121: Memory allocation error\n"); |
| goto fail; |
| } |
| pm121_sys_state[loop_id]->ticks = 1; |
| |
| /* Fill PID params */ |
| pid_param.gd = PM121_SYS_GD; |
| pid_param.gp = param->gp; |
| pid_param.gr = PM121_SYS_GR; |
| pid_param.interval = PM121_SYS_INTERVAL; |
| pid_param.history_len = PM121_SYS_HISTORY_SIZE; |
| pid_param.itarget = param->itarget; |
| if(control) |
| { |
| pid_param.min = control->ops->get_min(control); |
| pid_param.max = control->ops->get_max(control); |
| } else { |
| /* |
| * This is probably not the right!? |
| * Perhaps goto fail if control == NULL above? |
| */ |
| pid_param.min = 0; |
| pid_param.max = 0; |
| } |
| |
| wf_pid_init(&pm121_sys_state[loop_id]->pid, &pid_param); |
| |
| pr_debug("pm121: %s Fan control loop initialized.\n" |
| " itarged=%d.%03d, min=%d RPM, max=%d RPM\n", |
| loop_names[loop_id], FIX32TOPRINT(pid_param.itarget), |
| pid_param.min, pid_param.max); |
| return; |
| |
| fail: |
| /* note that this is not optimal since another loop may still |
| control the same control */ |
| printk(KERN_WARNING "pm121: failed to set up %s loop " |
| "setting \"%s\" to max speed.\n", |
| loop_names[loop_id], control ? control->name : "uninitialized value"); |
| |
| if (control) |
| wf_control_set_max(control); |
| } |
| |
| static void pm121_sys_fans_tick(int loop_id) |
| { |
| struct pm121_sys_param *param; |
| struct pm121_sys_state *st; |
| struct wf_sensor *sensor; |
| struct wf_control *control; |
| s32 temp, new_setpoint; |
| int rc; |
| |
| param = &(pm121_sys_all_params[loop_id][pm121_mach_model-2]); |
| st = pm121_sys_state[loop_id]; |
| sensor = *(param->sensor); |
| control = controls[param->control_id]; |
| |
| if (--st->ticks != 0) { |
| if (pm121_readjust) |
| goto readjust; |
| return; |
| } |
| st->ticks = PM121_SYS_INTERVAL; |
| |
| rc = sensor->ops->get_value(sensor, &temp); |
| if (rc) { |
| printk(KERN_WARNING "windfarm: %s sensor error %d\n", |
| sensor->name, rc); |
| pm121_failure_state |= FAILURE_SENSOR; |
| return; |
| } |
| |
| pr_debug("pm121: %s Fan tick ! %s: %d.%03d\n", |
| loop_names[loop_id], sensor->name, |
| FIX32TOPRINT(temp)); |
| |
| new_setpoint = wf_pid_run(&st->pid, temp); |
| |
| /* correction */ |
| new_setpoint = pm121_correct(new_setpoint, |
| param->control_id, |
| st->pid.param.min); |
| /* linked corretion */ |
| new_setpoint = pm121_connect(param->control_id, new_setpoint); |
| |
| if (new_setpoint == st->setpoint) |
| return; |
| st->setpoint = new_setpoint; |
| pr_debug("pm121: %s corrected setpoint: %d RPM\n", |
| control->name, (int)new_setpoint); |
| readjust: |
| if (control && pm121_failure_state == 0) { |
| rc = control->ops->set_value(control, st->setpoint); |
| if (rc) { |
| printk(KERN_WARNING "windfarm: %s fan error %d\n", |
| control->name, rc); |
| pm121_failure_state |= FAILURE_FAN; |
| } |
| } |
| } |
| |
| |
| /* CPU LOOP */ |
| static void pm121_create_cpu_fans(void) |
| { |
| struct wf_cpu_pid_param pid_param; |
| const struct smu_sdbp_header *hdr; |
| struct smu_sdbp_cpupiddata *piddata; |
| struct smu_sdbp_fvt *fvt; |
| struct wf_control *fan_cpu; |
| s32 tmax, tdelta, maxpow, powadj; |
| |
| fan_cpu = controls[FAN_CPU]; |
| |
| /* First, locate the PID params in SMU SBD */ |
| hdr = smu_get_sdb_partition(SMU_SDB_CPUPIDDATA_ID, NULL); |
| if (!hdr) { |
| printk(KERN_WARNING "pm121: CPU PID fan config not found.\n"); |
| goto fail; |
| } |
| piddata = (struct smu_sdbp_cpupiddata *)&hdr[1]; |
| |
| /* Get the FVT params for operating point 0 (the only supported one |
| * for now) in order to get tmax |
| */ |
| hdr = smu_get_sdb_partition(SMU_SDB_FVT_ID, NULL); |
| if (hdr) { |
| fvt = (struct smu_sdbp_fvt *)&hdr[1]; |
| tmax = ((s32)fvt->maxtemp) << 16; |
| } else |
| tmax = 0x5e0000; /* 94 degree default */ |
| |
| /* Alloc & initialize state */ |
| pm121_cpu_state = kmalloc(sizeof(struct pm121_cpu_state), |
| GFP_KERNEL); |
| if (pm121_cpu_state == NULL) |
| goto fail; |
| pm121_cpu_state->ticks = 1; |
| |
| /* Fill PID params */ |
| pid_param.interval = PM121_CPU_INTERVAL; |
| pid_param.history_len = piddata->history_len; |
| if (pid_param.history_len > WF_CPU_PID_MAX_HISTORY) { |
| printk(KERN_WARNING "pm121: History size overflow on " |
| "CPU control loop (%d)\n", piddata->history_len); |
| pid_param.history_len = WF_CPU_PID_MAX_HISTORY; |
| } |
| pid_param.gd = piddata->gd; |
| pid_param.gp = piddata->gp; |
| pid_param.gr = piddata->gr / pid_param.history_len; |
| |
| tdelta = ((s32)piddata->target_temp_delta) << 16; |
| maxpow = ((s32)piddata->max_power) << 16; |
| powadj = ((s32)piddata->power_adj) << 16; |
| |
| pid_param.tmax = tmax; |
| pid_param.ttarget = tmax - tdelta; |
| pid_param.pmaxadj = maxpow - powadj; |
| |
| pid_param.min = fan_cpu->ops->get_min(fan_cpu); |
| pid_param.max = fan_cpu->ops->get_max(fan_cpu); |
| |
| wf_cpu_pid_init(&pm121_cpu_state->pid, &pid_param); |
| |
| pr_debug("pm121: CPU Fan control initialized.\n"); |
| pr_debug(" ttarget=%d.%03d, tmax=%d.%03d, min=%d RPM, max=%d RPM,\n", |
| FIX32TOPRINT(pid_param.ttarget), FIX32TOPRINT(pid_param.tmax), |
| pid_param.min, pid_param.max); |
| |
| return; |
| |
| fail: |
| printk(KERN_WARNING "pm121: CPU fan config not found, max fan speed\n"); |
| |
| if (controls[CPUFREQ]) |
| wf_control_set_max(controls[CPUFREQ]); |
| if (fan_cpu) |
| wf_control_set_max(fan_cpu); |
| } |
| |
| |
| static void pm121_cpu_fans_tick(struct pm121_cpu_state *st) |
| { |
| s32 new_setpoint, temp, power; |
| struct wf_control *fan_cpu = NULL; |
| int rc; |
| |
| if (--st->ticks != 0) { |
| if (pm121_readjust) |
| goto readjust; |
| return; |
| } |
| st->ticks = PM121_CPU_INTERVAL; |
| |
| fan_cpu = controls[FAN_CPU]; |
| |
| rc = sensor_cpu_temp->ops->get_value(sensor_cpu_temp, &temp); |
| if (rc) { |
| printk(KERN_WARNING "pm121: CPU temp sensor error %d\n", |
| rc); |
| pm121_failure_state |= FAILURE_SENSOR; |
| return; |
| } |
| |
| rc = sensor_cpu_power->ops->get_value(sensor_cpu_power, &power); |
| if (rc) { |
| printk(KERN_WARNING "pm121: CPU power sensor error %d\n", |
| rc); |
| pm121_failure_state |= FAILURE_SENSOR; |
| return; |
| } |
| |
| pr_debug("pm121: CPU Fans tick ! CPU temp: %d.%03d°C, power: %d.%03d\n", |
| FIX32TOPRINT(temp), FIX32TOPRINT(power)); |
| |
| if (temp > st->pid.param.tmax) |
| pm121_failure_state |= FAILURE_OVERTEMP; |
| |
| new_setpoint = wf_cpu_pid_run(&st->pid, power, temp); |
| |
| /* correction */ |
| new_setpoint = pm121_correct(new_setpoint, |
| FAN_CPU, |
| st->pid.param.min); |
| |
| /* connected correction */ |
| new_setpoint = pm121_connect(FAN_CPU, new_setpoint); |
| |
| if (st->setpoint == new_setpoint) |
| return; |
| st->setpoint = new_setpoint; |
| pr_debug("pm121: CPU corrected setpoint: %d RPM\n", (int)new_setpoint); |
| |
| readjust: |
| if (fan_cpu && pm121_failure_state == 0) { |
| rc = fan_cpu->ops->set_value(fan_cpu, st->setpoint); |
| if (rc) { |
| printk(KERN_WARNING "pm121: %s fan error %d\n", |
| fan_cpu->name, rc); |
| pm121_failure_state |= FAILURE_FAN; |
| } |
| } |
| } |
| |
| /* |
| * ****** Common ****** |
| * |
| */ |
| |
| static void pm121_tick(void) |
| { |
| unsigned int last_failure = pm121_failure_state; |
| unsigned int new_failure; |
| s32 total_power; |
| int i; |
| |
| if (!pm121_started) { |
| pr_debug("pm121: creating control loops !\n"); |
| for (i = 0; i < N_LOOPS; i++) |
| pm121_create_sys_fans(i); |
| |
| pm121_create_cpu_fans(); |
| pm121_started = true; |
| } |
| |
| /* skipping ticks */ |
| if (pm121_skipping && --pm121_skipping) |
| return; |
| |
| /* compute average power */ |
| total_power = 0; |
| for (i = 0; i < pm121_cpu_state->pid.param.history_len; i++) |
| total_power += pm121_cpu_state->pid.powers[i]; |
| |
| average_power = total_power / pm121_cpu_state->pid.param.history_len; |
| |
| |
| pm121_failure_state = 0; |
| for (i = 0 ; i < N_LOOPS; i++) { |
| if (pm121_sys_state[i]) |
| pm121_sys_fans_tick(i); |
| } |
| |
| if (pm121_cpu_state) |
| pm121_cpu_fans_tick(pm121_cpu_state); |
| |
| pm121_readjust = 0; |
| new_failure = pm121_failure_state & ~last_failure; |
| |
| /* If entering failure mode, clamp cpufreq and ramp all |
| * fans to full speed. |
| */ |
| if (pm121_failure_state && !last_failure) { |
| for (i = 0; i < N_CONTROLS; i++) { |
| if (controls[i]) |
| wf_control_set_max(controls[i]); |
| } |
| } |
| |
| /* If leaving failure mode, unclamp cpufreq and readjust |
| * all fans on next iteration |
| */ |
| if (!pm121_failure_state && last_failure) { |
| if (controls[CPUFREQ]) |
| wf_control_set_min(controls[CPUFREQ]); |
| pm121_readjust = 1; |
| } |
| |
| /* Overtemp condition detected, notify and start skipping a couple |
| * ticks to let the temperature go down |
| */ |
| if (new_failure & FAILURE_OVERTEMP) { |
| wf_set_overtemp(); |
| pm121_skipping = 2; |
| pm121_overtemp = true; |
| } |
| |
| /* We only clear the overtemp condition if overtemp is cleared |
| * _and_ no other failure is present. Since a sensor error will |
| * clear the overtemp condition (can't measure temperature) at |
| * the control loop levels, but we don't want to keep it clear |
| * here in this case |
| */ |
| if (!pm121_failure_state && pm121_overtemp) { |
| wf_clear_overtemp(); |
| pm121_overtemp = false; |
| } |
| } |
| |
| |
| static struct wf_control* pm121_register_control(struct wf_control *ct, |
| const char *match, |
| unsigned int id) |
| { |
| if (controls[id] == NULL && !strcmp(ct->name, match)) { |
| if (wf_get_control(ct) == 0) |
| controls[id] = ct; |
| } |
| return controls[id]; |
| } |
| |
| static void pm121_new_control(struct wf_control *ct) |
| { |
| int all = 1; |
| |
| if (pm121_all_controls_ok) |
| return; |
| |
| all = pm121_register_control(ct, "optical-drive-fan", FAN_OD) && all; |
| all = pm121_register_control(ct, "hard-drive-fan", FAN_HD) && all; |
| all = pm121_register_control(ct, "cpu-fan", FAN_CPU) && all; |
| all = pm121_register_control(ct, "cpufreq-clamp", CPUFREQ) && all; |
| |
| if (all) |
| pm121_all_controls_ok = 1; |
| } |
| |
| |
| |
| |
| static struct wf_sensor* pm121_register_sensor(struct wf_sensor *sensor, |
| const char *match, |
| struct wf_sensor **var) |
| { |
| if (*var == NULL && !strcmp(sensor->name, match)) { |
| if (wf_get_sensor(sensor) == 0) |
| *var = sensor; |
| } |
| return *var; |
| } |
| |
| static void pm121_new_sensor(struct wf_sensor *sr) |
| { |
| int all = 1; |
| |
| if (pm121_all_sensors_ok) |
| return; |
| |
| all = pm121_register_sensor(sr, "cpu-temp", |
| &sensor_cpu_temp) && all; |
| all = pm121_register_sensor(sr, "cpu-current", |
| &sensor_cpu_current) && all; |
| all = pm121_register_sensor(sr, "cpu-voltage", |
| &sensor_cpu_voltage) && all; |
| all = pm121_register_sensor(sr, "cpu-power", |
| &sensor_cpu_power) && all; |
| all = pm121_register_sensor(sr, "hard-drive-temp", |
| &sensor_hard_drive_temp) && all; |
| all = pm121_register_sensor(sr, "optical-drive-temp", |
| &sensor_optical_drive_temp) && all; |
| all = pm121_register_sensor(sr, "incoming-air-temp", |
| &sensor_incoming_air_temp) && all; |
| all = pm121_register_sensor(sr, "north-bridge-temp", |
| &sensor_north_bridge_temp) && all; |
| all = pm121_register_sensor(sr, "gpu-temp", |
| &sensor_gpu_temp) && all; |
| |
| if (all) |
| pm121_all_sensors_ok = 1; |
| } |
| |
| |
| |
| static int pm121_notify(struct notifier_block *self, |
| unsigned long event, void *data) |
| { |
| switch (event) { |
| case WF_EVENT_NEW_CONTROL: |
| pr_debug("pm121: new control %s detected\n", |
| ((struct wf_control *)data)->name); |
| pm121_new_control(data); |
| break; |
| case WF_EVENT_NEW_SENSOR: |
| pr_debug("pm121: new sensor %s detected\n", |
| ((struct wf_sensor *)data)->name); |
| pm121_new_sensor(data); |
| break; |
| case WF_EVENT_TICK: |
| if (pm121_all_controls_ok && pm121_all_sensors_ok) |
| pm121_tick(); |
| break; |
| } |
| |
| return 0; |
| } |
| |
| static struct notifier_block pm121_events = { |
| .notifier_call = pm121_notify, |
| }; |
| |
| static int pm121_init_pm(void) |
| { |
| const struct smu_sdbp_header *hdr; |
| |
| hdr = smu_get_sdb_partition(SMU_SDB_SENSORTREE_ID, NULL); |
| if (hdr) { |
| struct smu_sdbp_sensortree *st = |
| (struct smu_sdbp_sensortree *)&hdr[1]; |
| pm121_mach_model = st->model_id; |
| } |
| |
| pm121_connection = &pm121_connections[pm121_mach_model - 2]; |
| |
| printk(KERN_INFO "pm121: Initializing for iMac G5 iSight model ID %d\n", |
| pm121_mach_model); |
| |
| return 0; |
| } |
| |
| |
| static int pm121_probe(struct platform_device *ddev) |
| { |
| wf_register_client(&pm121_events); |
| |
| return 0; |
| } |
| |
| static void pm121_remove(struct platform_device *ddev) |
| { |
| wf_unregister_client(&pm121_events); |
| } |
| |
| static struct platform_driver pm121_driver = { |
| .probe = pm121_probe, |
| .remove_new = pm121_remove, |
| .driver = { |
| .name = "windfarm", |
| .bus = &platform_bus_type, |
| }, |
| }; |
| |
| |
| static int __init pm121_init(void) |
| { |
| int rc = -ENODEV; |
| |
| if (of_machine_is_compatible("PowerMac12,1")) |
| rc = pm121_init_pm(); |
| |
| if (rc == 0) { |
| request_module("windfarm_smu_controls"); |
| request_module("windfarm_smu_sensors"); |
| request_module("windfarm_smu_sat"); |
| request_module("windfarm_lm75_sensor"); |
| request_module("windfarm_max6690_sensor"); |
| request_module("windfarm_cpufreq_clamp"); |
| platform_driver_register(&pm121_driver); |
| } |
| |
| return rc; |
| } |
| |
| static void __exit pm121_exit(void) |
| { |
| |
| platform_driver_unregister(&pm121_driver); |
| } |
| |
| |
| module_init(pm121_init); |
| module_exit(pm121_exit); |
| |
| MODULE_AUTHOR("Étienne Bersac <bersace@gmail.com>"); |
| MODULE_DESCRIPTION("Thermal control logic for iMac G5 (iSight)"); |
| MODULE_LICENSE("GPL"); |
| |
