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![Joel Stanley](/assets/img/avatar_default.png)
orderly_poweroff() unconditionally returns 0, so remove the dead code that checks the return value. A future patch will change the return type to void. Signed-off-by: Joel Stanley <joel@jms.id.au> Acked-by: David S. Miller <davem@davemloft.net> Cc: Fabian Frederick <fabf@skynet.be> Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org> Cc: Michael Ellerman <mpe@ellerman.id.au> Cc: Rusty Russell <rusty@rustcorp.com.au> Cc: Jeremy Kerr <jk@ozlabs.org> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
600 lines
16 KiB
C
600 lines
16 KiB
C
/* bbc_envctrl.c: UltraSPARC-III environment control driver.
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*
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* Copyright (C) 2001, 2008 David S. Miller (davem@davemloft.net)
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*/
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#include <linux/kthread.h>
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#include <linux/delay.h>
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#include <linux/kmod.h>
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#include <linux/reboot.h>
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#include <linux/of.h>
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#include <linux/slab.h>
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#include <linux/of_device.h>
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#include <asm/oplib.h>
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#include "bbc_i2c.h"
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#include "max1617.h"
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#undef ENVCTRL_TRACE
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/* WARNING: Making changes to this driver is very dangerous.
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* If you misprogram the sensor chips they can
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* cut the power on you instantly.
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*/
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/* Two temperature sensors exist in the SunBLADE-1000 enclosure.
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* Both are implemented using max1617 i2c devices. Each max1617
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* monitors 2 temperatures, one for one of the cpu dies and the other
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* for the ambient temperature.
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*
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* The max1617 is capable of being programmed with power-off
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* temperature values, one low limit and one high limit. These
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* can be controlled independently for the cpu or ambient temperature.
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* If a limit is violated, the power is simply shut off. The frequency
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* with which the max1617 does temperature sampling can be controlled
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* as well.
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*
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* Three fans exist inside the machine, all three are controlled with
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* an i2c digital to analog converter. There is a fan directed at the
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* two processor slots, another for the rest of the enclosure, and the
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* third is for the power supply. The first two fans may be speed
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* controlled by changing the voltage fed to them. The third fan may
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* only be completely off or on. The third fan is meant to only be
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* disabled/enabled when entering/exiting the lowest power-saving
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* mode of the machine.
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*
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* An environmental control kernel thread periodically monitors all
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* temperature sensors. Based upon the samples it will adjust the
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* fan speeds to try and keep the system within a certain temperature
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* range (the goal being to make the fans as quiet as possible without
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* allowing the system to get too hot).
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*
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* If the temperature begins to rise/fall outside of the acceptable
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* operating range, a periodic warning will be sent to the kernel log.
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* The fans will be put on full blast to attempt to deal with this
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* situation. After exceeding the acceptable operating range by a
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* certain threshold, the kernel thread will shut down the system.
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* Here, the thread is attempting to shut the machine down cleanly
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* before the hardware based power-off event is triggered.
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*/
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/* These settings are in Celsius. We use these defaults only
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* if we cannot interrogate the cpu-fru SEEPROM.
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*/
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struct temp_limits {
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s8 high_pwroff, high_shutdown, high_warn;
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s8 low_warn, low_shutdown, low_pwroff;
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};
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static struct temp_limits cpu_temp_limits[2] = {
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{ 100, 85, 80, 5, -5, -10 },
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{ 100, 85, 80, 5, -5, -10 },
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};
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static struct temp_limits amb_temp_limits[2] = {
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{ 65, 55, 40, 5, -5, -10 },
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{ 65, 55, 40, 5, -5, -10 },
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};
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static LIST_HEAD(all_temps);
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static LIST_HEAD(all_fans);
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#define CPU_FAN_REG 0xf0
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#define SYS_FAN_REG 0xf2
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#define PSUPPLY_FAN_REG 0xf4
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#define FAN_SPEED_MIN 0x0c
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#define FAN_SPEED_MAX 0x3f
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#define PSUPPLY_FAN_ON 0x1f
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#define PSUPPLY_FAN_OFF 0x00
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static void set_fan_speeds(struct bbc_fan_control *fp)
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{
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/* Put temperatures into range so we don't mis-program
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* the hardware.
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*/
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if (fp->cpu_fan_speed < FAN_SPEED_MIN)
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fp->cpu_fan_speed = FAN_SPEED_MIN;
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if (fp->cpu_fan_speed > FAN_SPEED_MAX)
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fp->cpu_fan_speed = FAN_SPEED_MAX;
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if (fp->system_fan_speed < FAN_SPEED_MIN)
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fp->system_fan_speed = FAN_SPEED_MIN;
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if (fp->system_fan_speed > FAN_SPEED_MAX)
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fp->system_fan_speed = FAN_SPEED_MAX;
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#ifdef ENVCTRL_TRACE
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printk("fan%d: Changed fan speed to cpu(%02x) sys(%02x)\n",
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fp->index,
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fp->cpu_fan_speed, fp->system_fan_speed);
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#endif
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bbc_i2c_writeb(fp->client, fp->cpu_fan_speed, CPU_FAN_REG);
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bbc_i2c_writeb(fp->client, fp->system_fan_speed, SYS_FAN_REG);
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bbc_i2c_writeb(fp->client,
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(fp->psupply_fan_on ?
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PSUPPLY_FAN_ON : PSUPPLY_FAN_OFF),
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PSUPPLY_FAN_REG);
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}
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static void get_current_temps(struct bbc_cpu_temperature *tp)
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{
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tp->prev_amb_temp = tp->curr_amb_temp;
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bbc_i2c_readb(tp->client,
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(unsigned char *) &tp->curr_amb_temp,
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MAX1617_AMB_TEMP);
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tp->prev_cpu_temp = tp->curr_cpu_temp;
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bbc_i2c_readb(tp->client,
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(unsigned char *) &tp->curr_cpu_temp,
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MAX1617_CPU_TEMP);
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#ifdef ENVCTRL_TRACE
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printk("temp%d: cpu(%d C) amb(%d C)\n",
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tp->index,
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(int) tp->curr_cpu_temp, (int) tp->curr_amb_temp);
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#endif
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}
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static void do_envctrl_shutdown(struct bbc_cpu_temperature *tp)
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{
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static int shutting_down = 0;
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char *type = "???";
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s8 val = -1;
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if (shutting_down != 0)
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return;
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if (tp->curr_amb_temp >= amb_temp_limits[tp->index].high_shutdown ||
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tp->curr_amb_temp < amb_temp_limits[tp->index].low_shutdown) {
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type = "ambient";
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val = tp->curr_amb_temp;
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} else if (tp->curr_cpu_temp >= cpu_temp_limits[tp->index].high_shutdown ||
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tp->curr_cpu_temp < cpu_temp_limits[tp->index].low_shutdown) {
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type = "CPU";
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val = tp->curr_cpu_temp;
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}
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printk(KERN_CRIT "temp%d: Outside of safe %s "
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"operating temperature, %d C.\n",
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tp->index, type, val);
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printk(KERN_CRIT "kenvctrld: Shutting down the system now.\n");
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shutting_down = 1;
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orderly_poweroff(true);
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}
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#define WARN_INTERVAL (30 * HZ)
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static void analyze_ambient_temp(struct bbc_cpu_temperature *tp, unsigned long *last_warn, int tick)
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{
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int ret = 0;
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if (time_after(jiffies, (*last_warn + WARN_INTERVAL))) {
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if (tp->curr_amb_temp >=
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amb_temp_limits[tp->index].high_warn) {
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printk(KERN_WARNING "temp%d: "
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"Above safe ambient operating temperature, %d C.\n",
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tp->index, (int) tp->curr_amb_temp);
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ret = 1;
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} else if (tp->curr_amb_temp <
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amb_temp_limits[tp->index].low_warn) {
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printk(KERN_WARNING "temp%d: "
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"Below safe ambient operating temperature, %d C.\n",
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tp->index, (int) tp->curr_amb_temp);
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ret = 1;
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}
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if (ret)
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*last_warn = jiffies;
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} else if (tp->curr_amb_temp >= amb_temp_limits[tp->index].high_warn ||
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tp->curr_amb_temp < amb_temp_limits[tp->index].low_warn)
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ret = 1;
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/* Now check the shutdown limits. */
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if (tp->curr_amb_temp >= amb_temp_limits[tp->index].high_shutdown ||
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tp->curr_amb_temp < amb_temp_limits[tp->index].low_shutdown) {
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do_envctrl_shutdown(tp);
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ret = 1;
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}
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if (ret) {
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tp->fan_todo[FAN_AMBIENT] = FAN_FULLBLAST;
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} else if ((tick & (8 - 1)) == 0) {
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s8 amb_goal_hi = amb_temp_limits[tp->index].high_warn - 10;
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s8 amb_goal_lo;
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amb_goal_lo = amb_goal_hi - 3;
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/* We do not try to avoid 'too cold' events. Basically we
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* only try to deal with over-heating and fan noise reduction.
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*/
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if (tp->avg_amb_temp < amb_goal_hi) {
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if (tp->avg_amb_temp >= amb_goal_lo)
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tp->fan_todo[FAN_AMBIENT] = FAN_SAME;
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else
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tp->fan_todo[FAN_AMBIENT] = FAN_SLOWER;
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} else {
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tp->fan_todo[FAN_AMBIENT] = FAN_FASTER;
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}
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} else {
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tp->fan_todo[FAN_AMBIENT] = FAN_SAME;
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}
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}
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static void analyze_cpu_temp(struct bbc_cpu_temperature *tp, unsigned long *last_warn, int tick)
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{
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int ret = 0;
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if (time_after(jiffies, (*last_warn + WARN_INTERVAL))) {
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if (tp->curr_cpu_temp >=
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cpu_temp_limits[tp->index].high_warn) {
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printk(KERN_WARNING "temp%d: "
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"Above safe CPU operating temperature, %d C.\n",
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tp->index, (int) tp->curr_cpu_temp);
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ret = 1;
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} else if (tp->curr_cpu_temp <
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cpu_temp_limits[tp->index].low_warn) {
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printk(KERN_WARNING "temp%d: "
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"Below safe CPU operating temperature, %d C.\n",
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tp->index, (int) tp->curr_cpu_temp);
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ret = 1;
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}
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if (ret)
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*last_warn = jiffies;
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} else if (tp->curr_cpu_temp >= cpu_temp_limits[tp->index].high_warn ||
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tp->curr_cpu_temp < cpu_temp_limits[tp->index].low_warn)
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ret = 1;
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/* Now check the shutdown limits. */
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if (tp->curr_cpu_temp >= cpu_temp_limits[tp->index].high_shutdown ||
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tp->curr_cpu_temp < cpu_temp_limits[tp->index].low_shutdown) {
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do_envctrl_shutdown(tp);
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ret = 1;
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}
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if (ret) {
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tp->fan_todo[FAN_CPU] = FAN_FULLBLAST;
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} else if ((tick & (8 - 1)) == 0) {
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s8 cpu_goal_hi = cpu_temp_limits[tp->index].high_warn - 10;
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s8 cpu_goal_lo;
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cpu_goal_lo = cpu_goal_hi - 3;
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/* We do not try to avoid 'too cold' events. Basically we
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* only try to deal with over-heating and fan noise reduction.
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*/
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if (tp->avg_cpu_temp < cpu_goal_hi) {
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if (tp->avg_cpu_temp >= cpu_goal_lo)
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tp->fan_todo[FAN_CPU] = FAN_SAME;
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else
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tp->fan_todo[FAN_CPU] = FAN_SLOWER;
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} else {
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tp->fan_todo[FAN_CPU] = FAN_FASTER;
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}
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} else {
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tp->fan_todo[FAN_CPU] = FAN_SAME;
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}
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}
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static void analyze_temps(struct bbc_cpu_temperature *tp, unsigned long *last_warn)
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{
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tp->avg_amb_temp = (s8)((int)((int)tp->avg_amb_temp + (int)tp->curr_amb_temp) / 2);
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tp->avg_cpu_temp = (s8)((int)((int)tp->avg_cpu_temp + (int)tp->curr_cpu_temp) / 2);
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analyze_ambient_temp(tp, last_warn, tp->sample_tick);
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analyze_cpu_temp(tp, last_warn, tp->sample_tick);
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tp->sample_tick++;
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}
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static enum fan_action prioritize_fan_action(int which_fan)
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{
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struct bbc_cpu_temperature *tp;
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enum fan_action decision = FAN_STATE_MAX;
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/* Basically, prioritize what the temperature sensors
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* recommend we do, and perform that action on all the
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* fans.
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*/
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list_for_each_entry(tp, &all_temps, glob_list) {
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if (tp->fan_todo[which_fan] == FAN_FULLBLAST) {
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decision = FAN_FULLBLAST;
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break;
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}
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if (tp->fan_todo[which_fan] == FAN_SAME &&
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decision != FAN_FASTER)
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decision = FAN_SAME;
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else if (tp->fan_todo[which_fan] == FAN_FASTER)
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decision = FAN_FASTER;
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else if (decision != FAN_FASTER &&
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decision != FAN_SAME &&
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tp->fan_todo[which_fan] == FAN_SLOWER)
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decision = FAN_SLOWER;
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}
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if (decision == FAN_STATE_MAX)
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decision = FAN_SAME;
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return decision;
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}
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static int maybe_new_ambient_fan_speed(struct bbc_fan_control *fp)
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{
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enum fan_action decision = prioritize_fan_action(FAN_AMBIENT);
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int ret;
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if (decision == FAN_SAME)
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return 0;
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ret = 1;
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if (decision == FAN_FULLBLAST) {
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if (fp->system_fan_speed >= FAN_SPEED_MAX)
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ret = 0;
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else
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fp->system_fan_speed = FAN_SPEED_MAX;
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} else {
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if (decision == FAN_FASTER) {
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if (fp->system_fan_speed >= FAN_SPEED_MAX)
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ret = 0;
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else
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fp->system_fan_speed += 2;
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} else {
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int orig_speed = fp->system_fan_speed;
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if (orig_speed <= FAN_SPEED_MIN ||
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orig_speed <= (fp->cpu_fan_speed - 3))
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ret = 0;
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else
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fp->system_fan_speed -= 1;
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}
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}
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return ret;
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}
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static int maybe_new_cpu_fan_speed(struct bbc_fan_control *fp)
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{
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enum fan_action decision = prioritize_fan_action(FAN_CPU);
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int ret;
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if (decision == FAN_SAME)
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return 0;
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ret = 1;
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if (decision == FAN_FULLBLAST) {
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if (fp->cpu_fan_speed >= FAN_SPEED_MAX)
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ret = 0;
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else
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fp->cpu_fan_speed = FAN_SPEED_MAX;
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} else {
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if (decision == FAN_FASTER) {
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if (fp->cpu_fan_speed >= FAN_SPEED_MAX)
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ret = 0;
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else {
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fp->cpu_fan_speed += 2;
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if (fp->system_fan_speed <
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(fp->cpu_fan_speed - 3))
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fp->system_fan_speed =
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fp->cpu_fan_speed - 3;
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}
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} else {
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if (fp->cpu_fan_speed <= FAN_SPEED_MIN)
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ret = 0;
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else
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fp->cpu_fan_speed -= 1;
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}
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}
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return ret;
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}
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static void maybe_new_fan_speeds(struct bbc_fan_control *fp)
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{
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int new;
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new = maybe_new_ambient_fan_speed(fp);
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new |= maybe_new_cpu_fan_speed(fp);
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if (new)
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set_fan_speeds(fp);
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}
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static void fans_full_blast(void)
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{
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struct bbc_fan_control *fp;
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/* Since we will not be monitoring things anymore, put
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* the fans on full blast.
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*/
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list_for_each_entry(fp, &all_fans, glob_list) {
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fp->cpu_fan_speed = FAN_SPEED_MAX;
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fp->system_fan_speed = FAN_SPEED_MAX;
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fp->psupply_fan_on = 1;
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set_fan_speeds(fp);
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}
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}
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#define POLL_INTERVAL (5 * 1000)
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static unsigned long last_warning_jiffies;
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static struct task_struct *kenvctrld_task;
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static int kenvctrld(void *__unused)
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{
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printk(KERN_INFO "bbc_envctrl: kenvctrld starting...\n");
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last_warning_jiffies = jiffies - WARN_INTERVAL;
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for (;;) {
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struct bbc_cpu_temperature *tp;
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struct bbc_fan_control *fp;
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msleep_interruptible(POLL_INTERVAL);
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if (kthread_should_stop())
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break;
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list_for_each_entry(tp, &all_temps, glob_list) {
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get_current_temps(tp);
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analyze_temps(tp, &last_warning_jiffies);
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}
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list_for_each_entry(fp, &all_fans, glob_list)
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maybe_new_fan_speeds(fp);
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}
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printk(KERN_INFO "bbc_envctrl: kenvctrld exiting...\n");
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fans_full_blast();
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return 0;
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}
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static void attach_one_temp(struct bbc_i2c_bus *bp, struct platform_device *op,
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int temp_idx)
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{
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struct bbc_cpu_temperature *tp;
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tp = kzalloc(sizeof(*tp), GFP_KERNEL);
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if (!tp)
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return;
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INIT_LIST_HEAD(&tp->bp_list);
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INIT_LIST_HEAD(&tp->glob_list);
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tp->client = bbc_i2c_attach(bp, op);
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if (!tp->client) {
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kfree(tp);
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return;
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}
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tp->index = temp_idx;
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list_add(&tp->glob_list, &all_temps);
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list_add(&tp->bp_list, &bp->temps);
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/* Tell it to convert once every 5 seconds, clear all cfg
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|
* bits.
|
|
*/
|
|
bbc_i2c_writeb(tp->client, 0x00, MAX1617_WR_CFG_BYTE);
|
|
bbc_i2c_writeb(tp->client, 0x02, MAX1617_WR_CVRATE_BYTE);
|
|
|
|
/* Program the hard temperature limits into the chip. */
|
|
bbc_i2c_writeb(tp->client, amb_temp_limits[tp->index].high_pwroff,
|
|
MAX1617_WR_AMB_HIGHLIM);
|
|
bbc_i2c_writeb(tp->client, amb_temp_limits[tp->index].low_pwroff,
|
|
MAX1617_WR_AMB_LOWLIM);
|
|
bbc_i2c_writeb(tp->client, cpu_temp_limits[tp->index].high_pwroff,
|
|
MAX1617_WR_CPU_HIGHLIM);
|
|
bbc_i2c_writeb(tp->client, cpu_temp_limits[tp->index].low_pwroff,
|
|
MAX1617_WR_CPU_LOWLIM);
|
|
|
|
get_current_temps(tp);
|
|
tp->prev_cpu_temp = tp->avg_cpu_temp = tp->curr_cpu_temp;
|
|
tp->prev_amb_temp = tp->avg_amb_temp = tp->curr_amb_temp;
|
|
|
|
tp->fan_todo[FAN_AMBIENT] = FAN_SAME;
|
|
tp->fan_todo[FAN_CPU] = FAN_SAME;
|
|
}
|
|
|
|
static void attach_one_fan(struct bbc_i2c_bus *bp, struct platform_device *op,
|
|
int fan_idx)
|
|
{
|
|
struct bbc_fan_control *fp;
|
|
|
|
fp = kzalloc(sizeof(*fp), GFP_KERNEL);
|
|
if (!fp)
|
|
return;
|
|
|
|
INIT_LIST_HEAD(&fp->bp_list);
|
|
INIT_LIST_HEAD(&fp->glob_list);
|
|
|
|
fp->client = bbc_i2c_attach(bp, op);
|
|
if (!fp->client) {
|
|
kfree(fp);
|
|
return;
|
|
}
|
|
|
|
fp->index = fan_idx;
|
|
|
|
list_add(&fp->glob_list, &all_fans);
|
|
list_add(&fp->bp_list, &bp->fans);
|
|
|
|
/* The i2c device controlling the fans is write-only.
|
|
* So the only way to keep track of the current power
|
|
* level fed to the fans is via software. Choose half
|
|
* power for cpu/system and 'on' fo the powersupply fan
|
|
* and set it now.
|
|
*/
|
|
fp->psupply_fan_on = 1;
|
|
fp->cpu_fan_speed = (FAN_SPEED_MAX - FAN_SPEED_MIN) / 2;
|
|
fp->cpu_fan_speed += FAN_SPEED_MIN;
|
|
fp->system_fan_speed = (FAN_SPEED_MAX - FAN_SPEED_MIN) / 2;
|
|
fp->system_fan_speed += FAN_SPEED_MIN;
|
|
|
|
set_fan_speeds(fp);
|
|
}
|
|
|
|
static void destroy_one_temp(struct bbc_cpu_temperature *tp)
|
|
{
|
|
bbc_i2c_detach(tp->client);
|
|
kfree(tp);
|
|
}
|
|
|
|
static void destroy_all_temps(struct bbc_i2c_bus *bp)
|
|
{
|
|
struct bbc_cpu_temperature *tp, *tpos;
|
|
|
|
list_for_each_entry_safe(tp, tpos, &bp->temps, bp_list) {
|
|
list_del(&tp->bp_list);
|
|
list_del(&tp->glob_list);
|
|
destroy_one_temp(tp);
|
|
}
|
|
}
|
|
|
|
static void destroy_one_fan(struct bbc_fan_control *fp)
|
|
{
|
|
bbc_i2c_detach(fp->client);
|
|
kfree(fp);
|
|
}
|
|
|
|
static void destroy_all_fans(struct bbc_i2c_bus *bp)
|
|
{
|
|
struct bbc_fan_control *fp, *fpos;
|
|
|
|
list_for_each_entry_safe(fp, fpos, &bp->fans, bp_list) {
|
|
list_del(&fp->bp_list);
|
|
list_del(&fp->glob_list);
|
|
destroy_one_fan(fp);
|
|
}
|
|
}
|
|
|
|
int bbc_envctrl_init(struct bbc_i2c_bus *bp)
|
|
{
|
|
struct platform_device *op;
|
|
int temp_index = 0;
|
|
int fan_index = 0;
|
|
int devidx = 0;
|
|
|
|
while ((op = bbc_i2c_getdev(bp, devidx++)) != NULL) {
|
|
if (!strcmp(op->dev.of_node->name, "temperature"))
|
|
attach_one_temp(bp, op, temp_index++);
|
|
if (!strcmp(op->dev.of_node->name, "fan-control"))
|
|
attach_one_fan(bp, op, fan_index++);
|
|
}
|
|
if (temp_index != 0 && fan_index != 0) {
|
|
kenvctrld_task = kthread_run(kenvctrld, NULL, "kenvctrld");
|
|
if (IS_ERR(kenvctrld_task)) {
|
|
int err = PTR_ERR(kenvctrld_task);
|
|
|
|
kenvctrld_task = NULL;
|
|
destroy_all_temps(bp);
|
|
destroy_all_fans(bp);
|
|
return err;
|
|
}
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
void bbc_envctrl_cleanup(struct bbc_i2c_bus *bp)
|
|
{
|
|
if (kenvctrld_task)
|
|
kthread_stop(kenvctrld_task);
|
|
|
|
destroy_all_temps(bp);
|
|
destroy_all_fans(bp);
|
|
}
|