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// SPDX-License-Identifier: GPL-2.0
/* bbc_envctrl.c: UltraSPARC-III environment control driver.
*
* Copyright (C) 2001, 2008 David S. Miller (davem@davemloft.net)
*/
#include <linux/kthread.h>
#include <linux/delay.h>
#include <linux/kmod.h>
#include <linux/reboot.h>
#include <linux/of.h>
#include <linux/slab.h>
#include <linux/of_device.h>
#include <asm/oplib.h>
#include "bbc_i2c.h"
#include "max1617.h"
#undef ENVCTRL_TRACE
/* WARNING: Making changes to this driver is very dangerous.
* If you misprogram the sensor chips they can
* cut the power on you instantly.
*/
/* Two temperature sensors exist in the SunBLADE-1000 enclosure.
* Both are implemented using max1617 i2c devices. Each max1617
* monitors 2 temperatures, one for one of the cpu dies and the other
* for the ambient temperature.
*
* The max1617 is capable of being programmed with power-off
* temperature values, one low limit and one high limit. These
* can be controlled independently for the cpu or ambient temperature.
* If a limit is violated, the power is simply shut off. The frequency
* with which the max1617 does temperature sampling can be controlled
* as well.
*
* Three fans exist inside the machine, all three are controlled with
* an i2c digital to analog converter. There is a fan directed at the
* two processor slots, another for the rest of the enclosure, and the
* third is for the power supply. The first two fans may be speed
* controlled by changing the voltage fed to them. The third fan may
* only be completely off or on. The third fan is meant to only be
* disabled/enabled when entering/exiting the lowest power-saving
* mode of the machine.
*
* An environmental control kernel thread periodically monitors all
* temperature sensors. Based upon the samples it will adjust the
* fan speeds to try and keep the system within a certain temperature
* range (the goal being to make the fans as quiet as possible without
* allowing the system to get too hot).
*
* If the temperature begins to rise/fall outside of the acceptable
* operating range, a periodic warning will be sent to the kernel log.
* The fans will be put on full blast to attempt to deal with this
* situation. After exceeding the acceptable operating range by a
* certain threshold, the kernel thread will shut down the system.
* Here, the thread is attempting to shut the machine down cleanly
* before the hardware based power-off event is triggered.
*/
/* These settings are in Celsius. We use these defaults only
* if we cannot interrogate the cpu-fru SEEPROM.
*/
struct temp_limits {
s8 high_pwroff, high_shutdown, high_warn;
s8 low_warn, low_shutdown, low_pwroff;
};
static struct temp_limits cpu_temp_limits[2] = {
{ 100, 85, 80, 5, -5, -10 },
{ 100, 85, 80, 5, -5, -10 },
};
static struct temp_limits amb_temp_limits[2] = {
{ 65, 55, 40, 5, -5, -10 },
{ 65, 55, 40, 5, -5, -10 },
};
static LIST_HEAD(all_temps);
static LIST_HEAD(all_fans);
#define CPU_FAN_REG 0xf0
#define SYS_FAN_REG 0xf2
#define PSUPPLY_FAN_REG 0xf4
#define FAN_SPEED_MIN 0x0c
#define FAN_SPEED_MAX 0x3f
#define PSUPPLY_FAN_ON 0x1f
#define PSUPPLY_FAN_OFF 0x00
static void set_fan_speeds(struct bbc_fan_control *fp)
{
/* Put temperatures into range so we don't mis-program
* the hardware.
*/
if (fp->cpu_fan_speed < FAN_SPEED_MIN)
fp->cpu_fan_speed = FAN_SPEED_MIN;
if (fp->cpu_fan_speed > FAN_SPEED_MAX)
fp->cpu_fan_speed = FAN_SPEED_MAX;
if (fp->system_fan_speed < FAN_SPEED_MIN)
fp->system_fan_speed = FAN_SPEED_MIN;
if (fp->system_fan_speed > FAN_SPEED_MAX)
fp->system_fan_speed = FAN_SPEED_MAX;
#ifdef ENVCTRL_TRACE
printk("fan%d: Changed fan speed to cpu(%02x) sys(%02x)\n",
fp->index,
fp->cpu_fan_speed, fp->system_fan_speed);
#endif
bbc_i2c_writeb(fp->client, fp->cpu_fan_speed, CPU_FAN_REG);
bbc_i2c_writeb(fp->client, fp->system_fan_speed, SYS_FAN_REG);
bbc_i2c_writeb(fp->client,
(fp->psupply_fan_on ?
PSUPPLY_FAN_ON : PSUPPLY_FAN_OFF),
PSUPPLY_FAN_REG);
}
static void get_current_temps(struct bbc_cpu_temperature *tp)
{
tp->prev_amb_temp = tp->curr_amb_temp;
bbc_i2c_readb(tp->client,
(unsigned char *) &tp->curr_amb_temp,
MAX1617_AMB_TEMP);
tp->prev_cpu_temp = tp->curr_cpu_temp;
bbc_i2c_readb(tp->client,
(unsigned char *) &tp->curr_cpu_temp,
MAX1617_CPU_TEMP);
#ifdef ENVCTRL_TRACE
printk("temp%d: cpu(%d C) amb(%d C)\n",
tp->index,
(int) tp->curr_cpu_temp, (int) tp->curr_amb_temp);
#endif
}
static void do_envctrl_shutdown(struct bbc_cpu_temperature *tp)
{
static int shutting_down = 0;
char *type = "???";
s8 val = -1;
if (shutting_down != 0)
return;
if (tp->curr_amb_temp >= amb_temp_limits[tp->index].high_shutdown ||
tp->curr_amb_temp < amb_temp_limits[tp->index].low_shutdown) {
type = "ambient";
val = tp->curr_amb_temp;
} else if (tp->curr_cpu_temp >= cpu_temp_limits[tp->index].high_shutdown ||
tp->curr_cpu_temp < cpu_temp_limits[tp->index].low_shutdown) {
type = "CPU";
val = tp->curr_cpu_temp;
}
printk(KERN_CRIT "temp%d: Outside of safe %s "
"operating temperature, %d C.\n",
tp->index, type, val);
printk(KERN_CRIT "kenvctrld: Shutting down the system now.\n");
shutting_down = 1;
orderly_poweroff(true);
}
#define WARN_INTERVAL (30 * HZ)
static void analyze_ambient_temp(struct bbc_cpu_temperature *tp, unsigned long *last_warn, int tick)
{
int ret = 0;
if (time_after(jiffies, (*last_warn + WARN_INTERVAL))) {
if (tp->curr_amb_temp >=
amb_temp_limits[tp->index].high_warn) {
printk(KERN_WARNING "temp%d: "
"Above safe ambient operating temperature, %d C.\n",
tp->index, (int) tp->curr_amb_temp);
ret = 1;
} else if (tp->curr_amb_temp <
amb_temp_limits[tp->index].low_warn) {
printk(KERN_WARNING "temp%d: "
"Below safe ambient operating temperature, %d C.\n",
tp->index, (int) tp->curr_amb_temp);
ret = 1;
}
if (ret)
*last_warn = jiffies;
} else if (tp->curr_amb_temp >= amb_temp_limits[tp->index].high_warn ||
tp->curr_amb_temp < amb_temp_limits[tp->index].low_warn)
ret = 1;
/* Now check the shutdown limits. */
if (tp->curr_amb_temp >= amb_temp_limits[tp->index].high_shutdown ||
tp->curr_amb_temp < amb_temp_limits[tp->index].low_shutdown) {
do_envctrl_shutdown(tp);
ret = 1;
}
if (ret) {
tp->fan_todo[FAN_AMBIENT] = FAN_FULLBLAST;
} else if ((tick & (8 - 1)) == 0) {
s8 amb_goal_hi = amb_temp_limits[tp->index].high_warn - 10;
s8 amb_goal_lo;
amb_goal_lo = amb_goal_hi - 3;
/* We do not try to avoid 'too cold' events. Basically we
* only try to deal with over-heating and fan noise reduction.
*/
if (tp->avg_amb_temp < amb_goal_hi) {
if (tp->avg_amb_temp >= amb_goal_lo)
tp->fan_todo[FAN_AMBIENT] = FAN_SAME;
else
tp->fan_todo[FAN_AMBIENT] = FAN_SLOWER;
} else {
tp->fan_todo[FAN_AMBIENT] = FAN_FASTER;
}
} else {
tp->fan_todo[FAN_AMBIENT] = FAN_SAME;
}
}
static void analyze_cpu_temp(struct bbc_cpu_temperature *tp, unsigned long *last_warn, int tick)
{
int
|