linux-imx

/*

 * Windfarm PowerMac thermal control.

 * Control loops for PowerMac7,2 and 7,3

 *

 * 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 *drives_temp;

​

static struct wf_control *cpu_front_fans[NR_CHIPS];

static struct wf_control *cpu_rear_fans[NR_CHIPS];

static struct wf_control *cpu_pumps[NR_CHIPS];

static struct wf_control *backside_fan;

static struct wf_control *drives_fan;

static struct wf_control *slots_fan;

static struct wf_control *cpufreq_clamp;

​

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