windfarm_pm91.c

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/*
 * Windfarm PowerMac thermal control. SMU based 1 CPU desktop control loops
 *
 * (c) Copyright 2005 Benjamin Herrenschmidt, IBM Corp.
 *                    <[e-mail]>
 *
 * Released under the term of the GNU GPL v2.
 *
 * 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 8.2 snapshot property lists (note however
 * that none of the code has been re-used, it's a complete re-implementation
 *
 * The various control loops found in Darwin config file are:
 *
 * PowerMac9,1
 * ===========
 *
 * Has 3 control loops: CPU fans is similar to PowerMac8,1 (though it doesn't
 * try to play with other control loops fans). Drive bay is rather basic PID
 * with one sensor and one fan. Slots area is a bit different as the Darwin
 * driver is supposed to be capable of working in a special "AGP" mode which
 * involves the presence of an AGP sensor and an AGP fan (possibly on the
 * AGP card itself). I can't deal with that special mode as I don't have
 * access to those additional sensor/fans for now (though ultimately, it would
 * be possible to add sensor objects for them) so I'm only implementing the
 * basic PCI slot control loop
 */

#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 <asm/prom.h>
#include <asm/machdep.h>
#include <asm/io.h>
#include <asm/system.h>
#include <asm/sections.h>
#include <asm/smu.h>

#include "windfarm.h"
#include "windfarm_pid.h"

#define VERSION "0.4"

#undef DEBUG

#ifdef DEBUG
#define DBG(args...)	printk(args)
#else
#define DBG(args...)	do { } while(0)
#endif

/* define this to force CPU overtemp to 74 degree, useful for testing
 * the overtemp code
 */
#undef HACKED_OVERTEMP

/* Controls & sensors */
static struct wf_sensor	*sensor_cpu_power;
static struct wf_sensor	*sensor_cpu_temp;
static struct wf_sensor	*sensor_hd_temp;
static struct wf_sensor	*sensor_slots_power;
static struct wf_control *fan_cpu_main;
static struct wf_control *fan_cpu_second;
static struct wf_control *fan_cpu_third;
static struct wf_control *fan_hd;
static struct wf_control *fan_slots;
static struct wf_control *cpufreq_clamp;

/* Set to kick the control loop into life */
static int wf_smu_all_controls_ok, wf_smu_all_sensors_ok, wf_smu_started;

/* Failure handling.. could be nicer */
#define FAILURE_FAN		0x01
#define FAILURE_SENSOR		0x02
#define FAILURE_OVERTEMP	0x04

static unsigned int wf_smu_failure_state;
static int wf_smu_readjust, wf_smu_skipping;

/*
 * ****** CPU Fans Control Loop ******
 *
 */


#define WF_SMU_CPU_FANS_INTERVAL	1
#define WF_SMU_CPU_FANS_MAX_HISTORY	16

/* State data used by the cpu fans control loop
 */
struct wf_smu_cpu_fans_state {
	int			ticks;
	s32			cpu_setpoint;
	struct wf_cpu_pid_state	pid;
};

static struct wf_smu_cpu_fans_state *wf_smu_cpu_fans;



/*
 * ****** Drive Fan Control Loop ******
 *
 */

struct wf_smu_drive_fans_state {
	int			ticks;
	s32			setpoint;
	struct wf_pid_state	pid;
};

static struct wf_smu_drive_fans_state *wf_smu_drive_fans;

/*
 * ****** Slots Fan Control Loop ******
 *
 */

struct wf_smu_slots_fans_state {
	int			ticks;
	s32			setpoint;
	struct wf_pid_state	pid;
};

static struct wf_smu_slots_fans_state *wf_smu_slots_fans;

/*
 * ***** Implementation *****
 *
 */


static void wf_smu_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;
	s32 tmax, tdelta, maxpow, powadj;

	/* First, locate the PID params in SMU SBD */
	hdr = smu_get_sdb_partition(SMU_SDB_CPUPIDDATA_ID, NULL);
	if (hdr == 0) {
		printk(KERN_WARNING "windfarm: CPU PID fan config not found "
		       "max fan speed\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 */
	wf_smu_cpu_fans = kmalloc(sizeof(struct wf_smu_cpu_fans_state),
				  GFP_KERNEL);
	if (wf_smu_cpu_fans == NULL)
		goto fail;
       	wf_smu_cpu_fans->ticks = 1;

	/* Fill PID params */
	pid_param.interval = WF_SMU_CPU_FANS_INTERVAL;
	pid_param.history_len = piddata->history_len;
	if (pid_param.history_len > WF_CPU_PID_MAX_HISTORY) {
		printk(KERN_WARNING "windfarm: 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_main->ops->get_min(fan_cpu_main);
	pid_param.max = fan_cpu_main->ops->get_max(fan_cpu_main);

	wf_cpu_pid_init(&wf_smu_cpu_fans->pid, &pid_param);

	DBG("wf: CPU Fan control initialized.\n");
	DBG("    ttarged=%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 "windfarm: CPU fan config not found\n"
	       "for this machine model, max fan speed\n");

	if (cpufreq_clamp)
		wf_control_set_max(cpufreq_clamp);
	if (fan_cpu_main)
		wf_control_set_max(fan_cpu_main);
}

static void wf_smu_cpu_fans_tick(struct wf_smu_cpu_fans_state *st)
{
	s32 new_setpoint, temp, power;
	int rc;

	if (--st->ticks != 0) {
		if (wf_smu_readjust)
			goto readjust;
		return;
	}
	st->ticks = WF_SMU_CPU_FANS_INTERVAL;

	rc = sensor_cpu_temp->ops->get_value(sensor_cpu_temp, &temp);
	if (rc) {
		printk(KERN_WARNING "windfarm: CPU temp sensor error %d\n",
		       rc);
		wf_smu_failure_state |= FAILURE_SENSOR;
		return;
	}

	rc = sensor_cpu_power->ops->get_value(sensor_cpu_power, &power);
	if (rc) {
		printk(KERN_WARNING "windfarm: CPU power sensor error %d\n",
		       rc);
		wf_smu_failure_state |= FAILURE_SENSOR;
		return;
	}

	DBG("wf_smu: CPU Fans tick ! CPU temp: %d.%03d, power: %d.%03d\n",
	    FIX32TOPRINT(temp), FIX32TOPRINT(power));

#ifdef HACKED_OVERTEMP
	if (temp > 0x4a0000)
		wf_smu_failure_state |= FAILURE_OVERTEMP;
#else
	if (temp > st->pid.param.tmax)
		wf_smu_failure_state |= FAILURE_OVERTEMP;
#endif
	new_setpoint = wf_cpu_pid_run(&st->pid, power, temp);

	DBG("wf_smu: new_setpoint: %d RPM\n", (int)new_setpoint);

	if (st->cpu_setpoint == new_setpoint)
		return;
	st->cpu_setpoint = new_setpoint;
 readjust:
	if (fan_cpu_main && wf_smu_failure_state == 0) {
		rc = fan_cpu_main->ops->set_value(fan_cpu_main,
						  st->cpu_setpoint);
		if (rc) {
			printk(KERN_WARNING "windfarm: CPU main fan"
			       " error %d\n", rc);
			wf_smu_failure_state |= FAILURE_FAN;
		}
	}
	if (fan_cpu_second && wf_smu_failure_state == 0) {
		rc = fan_cpu_second->ops->set_value(fan_cpu_second,
						    st->cpu_setpoint);
		if (rc) {
			printk(KERN_WARNING "windfarm: CPU second fan"
			       " error %d\n", rc);
			wf_smu_failure_state |= FAILURE_FAN;
		}
	}
	if (fan_cpu_third && wf_smu_failure_state == 0) {
		rc = fan_cpu_main->ops->set_value(fan_cpu_third,
						  st->cpu_setpoint);
		if (rc) {
			printk(KERN_WARNING "windfarm: CPU third fan"
			       " error %d\n", rc);
			wf_smu_failure_state |= FAILURE_FAN;
		}
	}
}

static void wf_smu_create_drive_fans(void)
{
	struct wf_pid_param param = {
		.interval	= 5,
		.history_len	= 2,
		.gd		= 0x01e00000,
		.gp		= 0x00500000,
		.gr		= 0x00000000,
		.itarget	= 0x00200000,
	};

	/* Alloc & initialize state */
	wf_smu_drive_fans = kmalloc(sizeof(struct wf_smu_drive_fans_state),
					GFP_KERNEL);
	if (wf_smu_drive_fans == NULL) {
		printk(KERN_WARNING "windfarm: Memory allocation error"
		       " max fan speed\n");
		goto fail;
	}
       	wf_smu_drive_fans->ticks = 1;

	/* Fill PID params */
	param.additive = (fan_hd->type == WF_CONTROL_RPM_FAN);
	param.min = fan_hd->ops->get_min(fan_hd);
	param.max = fan_hd->ops->get_max(fan_hd);
	wf_pid_init(&wf_smu_drive_fans->pid, &param);

	DBG("wf: Drive Fan control initialized.\n");
	DBG("    itarged=%d.%03d, min=%d RPM, max=%d RPM\n",
	    FIX32TOPRINT(param.itarget), param.min, param.max);
	return;

 fail:
	if (fan_hd)
		wf_control_set_max(fan_hd);
}

static void wf_smu_drive_fans_tick(struct wf_smu_drive_fans_state *st)
{
	s32 new_setpoint, temp;
	int rc;

	if (--st->ticks != 0) {
		if (wf_smu_readjust)
			goto readjust;
		return;
	}
	st->ticks = st->pid.param.interval;

	rc = sensor_hd_temp->ops->get_value(sensor_hd_temp, &temp);
	if (rc) {
		printk(KERN_WARNING "windfarm: HD temp sensor error %d\n",
		       rc);
		wf_smu_failure_state |= FAILURE_SENSOR;
		return;
	}

	DBG("wf_smu: Drive Fans tick ! HD temp: %d.%03d\n",
	    FIX32TOPRINT(temp));

	if (temp > (st->pid.param.itarget + 0x50000))
		wf_smu_failure_state |= FAILURE_OVERTEMP;

	new_setpoint = wf_pid_run(&st->pid, temp);

	DBG("wf_smu: new_setpoint: %d\n", (int)new_setpoint);

	if (st->setpoint == new_setpoint)
		return;
	st->setpoint = new_setpoint;
 readjust:
	if (fan_hd && wf_smu_failure_state == 0) {
		rc = fan_hd->ops->set_value(fan_hd, st->setpoint);
		if (rc) {
			printk(KERN_WARNING "windfarm: HD fan error %d\n",
			       rc);
			wf_smu_failure_state |= FAILURE_FAN;
		}
	}
}