linux-imx

/*

 * Windfarm PowerMac thermal control.

 * Control loops for RackMack3,1 (Xserve G5)

 *

 * Copyright (C) 2012 Benjamin Herrenschmidt, IBM Corp.

 *

 * Use and redistribute under the terms of the GNU GPL v2.

 */

#include <linux/types.h>

#include <linux/errno.h>

#include <linux/kernel.h>

#include <linux/device.h>

#include <linux/platform_device.h>

#include <linux/reboot.h>

#include <asm/prom.h>

#include <asm/smu.h>

​

#include "windfarm.h"

#include "windfarm_pid.h"

#include "windfarm_mpu.h"

​

#define VERSION "1.0"

​

#undef DEBUG

#undef LOTSA_DEBUG

​

#ifdef DEBUG

#define DBG(args...)    printk(args)

#else

#define DBG(args...)    do { } while(0)

#endif

​

#ifdef LOTSA_DEBUG

#define DBG_LOTS(args...)   printk(args)

#else

#define DBG_LOTS(args...)   do { } while(0)

#endif

​

/* define this to force CPU overtemp to 60 degree, useful for testing

 * the overtemp code

 */

#undef HACKED_OVERTEMP

​

/* We currently only handle 2 chips */

#define NR_CHIPS    2

#define NR_CPU_FANS 3 * NR_CHIPS

​

/* Controls and sensors */

static struct wf_sensor *sens_cpu_temp[NR_CHIPS];

static struct wf_sensor *sens_cpu_volts[NR_CHIPS];

static struct wf_sensor *sens_cpu_amps[NR_CHIPS];

static struct wf_sensor *backside_temp;

static struct wf_sensor *slots_temp;

static struct wf_sensor *dimms_temp;

​

static struct wf_control *cpu_fans[NR_CHIPS][3];

static struct wf_control *backside_fan;

static struct wf_control *slots_fan;

static struct wf_control *cpufreq_clamp;

​

/* We keep a temperature history for average calculation of 180s */

#define CPU_TEMP_HIST_SIZE  180

​

/* PID loop state */

static const struct mpu_data *cpu_mpu_data[NR_CHIPS];

static struct wf_cpu_pid_state cpu_pid[NR_CHIPS];

static u32 cpu_thist[CPU_TEMP_HIST_SIZE];

static int cpu_thist_pt;

static s64 cpu_thist_total;

static s32 cpu_all_tmax = 100 << 16;

static struct wf_pid_state backside_pid;

static int backside_tick;

static struct wf_pid_state slots_pid;

static int slots_tick;

static int slots_speed;

static struct wf_pid_state dimms_pid;

static int dimms_output_clamp;

​

static int nr_chips;

static bool have_all_controls;

static bool have_all_sensors;

static bool started;

​

static int failure_state;

#define FAILURE_SENSOR      1

#define FAILURE_FAN     2

#define FAILURE_PERM        4

#define FAILURE_LOW_OVERTEMP    8

#define FAILURE_HIGH_OVERTEMP   16

​

/* Overtemp values */

#define LOW_OVER_AVERAGE    0