607 lines
14 KiB
C
607 lines
14 KiB
C
// SPDX-License-Identifier: GPL-2.0-only
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/*
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* Windfarm PowerMac thermal control. FCU fan control
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*
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* Copyright 2012 Benjamin Herrenschmidt, IBM Corp.
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*/
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#undef DEBUG
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#include <linux/types.h>
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#include <linux/errno.h>
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#include <linux/kernel.h>
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#include <linux/delay.h>
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#include <linux/slab.h>
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#include <linux/init.h>
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#include <linux/wait.h>
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#include <linux/i2c.h>
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#include <asm/prom.h>
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#include <asm/machdep.h>
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#include <asm/io.h>
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#include <asm/sections.h>
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#include "windfarm.h"
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#include "windfarm_mpu.h"
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#define VERSION "1.0"
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#ifdef DEBUG
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#define DBG(args...) printk(args)
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#else
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#define DBG(args...) do { } while(0)
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#endif
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/*
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* This option is "weird" :) Basically, if you define this to 1
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* the control loop for the RPMs fans (not PWMs) will apply the
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* correction factor obtained from the PID to the actual RPM
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* speed read from the FCU.
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*
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* If you define the below constant to 0, then it will be
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* applied to the setpoint RPM speed, that is basically the
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* speed we proviously "asked" for.
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*
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* I'm using 0 for now which is what therm_pm72 used to do and
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* what Darwin -apparently- does based on observed behaviour.
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*/
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#define RPM_PID_USE_ACTUAL_SPEED 0
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/* Default min/max for pumps */
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#define CPU_PUMP_OUTPUT_MAX 3200
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#define CPU_PUMP_OUTPUT_MIN 1250
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#define FCU_FAN_RPM 0
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#define FCU_FAN_PWM 1
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struct wf_fcu_priv {
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struct kref ref;
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struct i2c_client *i2c;
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struct mutex lock;
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struct list_head fan_list;
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int rpm_shift;
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};
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struct wf_fcu_fan {
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struct list_head link;
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int id;
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s32 min, max, target;
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struct wf_fcu_priv *fcu_priv;
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struct wf_control ctrl;
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};
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static void wf_fcu_release(struct kref *ref)
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{
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struct wf_fcu_priv *pv = container_of(ref, struct wf_fcu_priv, ref);
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kfree(pv);
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}
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static void wf_fcu_fan_release(struct wf_control *ct)
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{
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struct wf_fcu_fan *fan = ct->priv;
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kref_put(&fan->fcu_priv->ref, wf_fcu_release);
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kfree(fan);
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}
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static int wf_fcu_read_reg(struct wf_fcu_priv *pv, int reg,
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unsigned char *buf, int nb)
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{
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int tries, nr, nw;
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mutex_lock(&pv->lock);
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buf[0] = reg;
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tries = 0;
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for (;;) {
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nw = i2c_master_send(pv->i2c, buf, 1);
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if (nw > 0 || (nw < 0 && nw != -EIO) || tries >= 100)
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break;
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msleep(10);
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++tries;
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}
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if (nw <= 0) {
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pr_err("Failure writing address to FCU: %d", nw);
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nr = nw;
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goto bail;
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}
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tries = 0;
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for (;;) {
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nr = i2c_master_recv(pv->i2c, buf, nb);
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if (nr > 0 || (nr < 0 && nr != -ENODEV) || tries >= 100)
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break;
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msleep(10);
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++tries;
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}
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if (nr <= 0)
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pr_err("wf_fcu: Failure reading data from FCU: %d", nw);
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bail:
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mutex_unlock(&pv->lock);
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return nr;
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}
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static int wf_fcu_write_reg(struct wf_fcu_priv *pv, int reg,
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const unsigned char *ptr, int nb)
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{
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int tries, nw;
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unsigned char buf[16];
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buf[0] = reg;
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memcpy(buf+1, ptr, nb);
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++nb;
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tries = 0;
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for (;;) {
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nw = i2c_master_send(pv->i2c, buf, nb);
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if (nw > 0 || (nw < 0 && nw != -EIO) || tries >= 100)
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break;
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msleep(10);
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++tries;
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}
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if (nw < 0)
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pr_err("wf_fcu: Failure writing to FCU: %d", nw);
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return nw;
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}
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static int wf_fcu_fan_set_rpm(struct wf_control *ct, s32 value)
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{
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struct wf_fcu_fan *fan = ct->priv;
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struct wf_fcu_priv *pv = fan->fcu_priv;
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int rc, shift = pv->rpm_shift;
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unsigned char buf[2];
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if (value < fan->min)
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value = fan->min;
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if (value > fan->max)
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value = fan->max;
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fan->target = value;
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buf[0] = value >> (8 - shift);
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buf[1] = value << shift;
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rc = wf_fcu_write_reg(pv, 0x10 + (fan->id * 2), buf, 2);
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if (rc < 0)
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return -EIO;
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return 0;
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}
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static int wf_fcu_fan_get_rpm(struct wf_control *ct, s32 *value)
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{
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struct wf_fcu_fan *fan = ct->priv;
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struct wf_fcu_priv *pv = fan->fcu_priv;
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int rc, reg_base, shift = pv->rpm_shift;
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unsigned char failure;
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unsigned char active;
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unsigned char buf[2];
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rc = wf_fcu_read_reg(pv, 0xb, &failure, 1);
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if (rc != 1)
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return -EIO;
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if ((failure & (1 << fan->id)) != 0)
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return -EFAULT;
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rc = wf_fcu_read_reg(pv, 0xd, &active, 1);
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if (rc != 1)
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return -EIO;
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if ((active & (1 << fan->id)) == 0)
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return -ENXIO;
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/* Programmed value or real current speed */
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#if RPM_PID_USE_ACTUAL_SPEED
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reg_base = 0x11;
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#else
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reg_base = 0x10;
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#endif
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rc = wf_fcu_read_reg(pv, reg_base + (fan->id * 2), buf, 2);
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if (rc != 2)
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return -EIO;
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*value = (buf[0] << (8 - shift)) | buf[1] >> shift;
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return 0;
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}
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static int wf_fcu_fan_set_pwm(struct wf_control *ct, s32 value)
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{
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struct wf_fcu_fan *fan = ct->priv;
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struct wf_fcu_priv *pv = fan->fcu_priv;
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unsigned char buf[2];
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int rc;
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if (value < fan->min)
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value = fan->min;
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if (value > fan->max)
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value = fan->max;
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fan->target = value;
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value = (value * 2559) / 1000;
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buf[0] = value;
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rc = wf_fcu_write_reg(pv, 0x30 + (fan->id * 2), buf, 1);
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if (rc < 0)
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return -EIO;
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return 0;
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}
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static int wf_fcu_fan_get_pwm(struct wf_control *ct, s32 *value)
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{
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struct wf_fcu_fan *fan = ct->priv;
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struct wf_fcu_priv *pv = fan->fcu_priv;
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unsigned char failure;
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unsigned char active;
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unsigned char buf[2];
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int rc;
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rc = wf_fcu_read_reg(pv, 0x2b, &failure, 1);
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if (rc != 1)
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return -EIO;
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if ((failure & (1 << fan->id)) != 0)
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return -EFAULT;
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rc = wf_fcu_read_reg(pv, 0x2d, &active, 1);
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if (rc != 1)
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return -EIO;
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if ((active & (1 << fan->id)) == 0)
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return -ENXIO;
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rc = wf_fcu_read_reg(pv, 0x30 + (fan->id * 2), buf, 1);
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if (rc != 1)
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return -EIO;
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*value = (((s32)buf[0]) * 1000) / 2559;
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return 0;
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}
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static s32 wf_fcu_fan_min(struct wf_control *ct)
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{
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struct wf_fcu_fan *fan = ct->priv;
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return fan->min;
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}
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static s32 wf_fcu_fan_max(struct wf_control *ct)
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{
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struct wf_fcu_fan *fan = ct->priv;
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return fan->max;
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}
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static const struct wf_control_ops wf_fcu_fan_rpm_ops = {
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.set_value = wf_fcu_fan_set_rpm,
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.get_value = wf_fcu_fan_get_rpm,
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.get_min = wf_fcu_fan_min,
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.get_max = wf_fcu_fan_max,
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.release = wf_fcu_fan_release,
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.owner = THIS_MODULE,
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};
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static const struct wf_control_ops wf_fcu_fan_pwm_ops = {
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.set_value = wf_fcu_fan_set_pwm,
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.get_value = wf_fcu_fan_get_pwm,
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.get_min = wf_fcu_fan_min,
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.get_max = wf_fcu_fan_max,
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.release = wf_fcu_fan_release,
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.owner = THIS_MODULE,
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};
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static void wf_fcu_get_pump_minmax(struct wf_fcu_fan *fan)
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{
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const struct mpu_data *mpu = wf_get_mpu(0);
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u16 pump_min = 0, pump_max = 0xffff;
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u16 tmp[4];
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/* Try to fetch pumps min/max infos from eeprom */
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if (mpu) {
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memcpy(&tmp, mpu->processor_part_num, 8);
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if (tmp[0] != 0xffff && tmp[1] != 0xffff) {
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pump_min = max(pump_min, tmp[0]);
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pump_max = min(pump_max, tmp[1]);
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}
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if (tmp[2] != 0xffff && tmp[3] != 0xffff) {
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pump_min = max(pump_min, tmp[2]);
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pump_max = min(pump_max, tmp[3]);
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}
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}
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/* Double check the values, this _IS_ needed as the EEPROM on
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* some dual 2.5Ghz G5s seem, at least, to have both min & max
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* same to the same value ... (grrrr)
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*/
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if (pump_min == pump_max || pump_min == 0 || pump_max == 0xffff) {
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pump_min = CPU_PUMP_OUTPUT_MIN;
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pump_max = CPU_PUMP_OUTPUT_MAX;
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}
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fan->min = pump_min;
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fan->max = pump_max;
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DBG("wf_fcu: pump min/max for %s set to: [%d..%d] RPM\n",
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fan->ctrl.name, pump_min, pump_max);
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}
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static void wf_fcu_get_rpmfan_minmax(struct wf_fcu_fan *fan)
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{
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struct wf_fcu_priv *pv = fan->fcu_priv;
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const struct mpu_data *mpu0 = wf_get_mpu(0);
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const struct mpu_data *mpu1 = wf_get_mpu(1);
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/* Default */
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fan->min = 2400 >> pv->rpm_shift;
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fan->max = 56000 >> pv->rpm_shift;
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/* CPU fans have min/max in MPU */
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if (mpu0 && !strcmp(fan->ctrl.name, "cpu-front-fan-0")) {
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fan->min = max(fan->min, (s32)mpu0->rminn_intake_fan);
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fan->max = min(fan->max, (s32)mpu0->rmaxn_intake_fan);
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goto bail;
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}
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if (mpu1 && !strcmp(fan->ctrl.name, "cpu-front-fan-1")) {
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fan->min = max(fan->min, (s32)mpu1->rminn_intake_fan);
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fan->max = min(fan->max, (s32)mpu1->rmaxn_intake_fan);
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goto bail;
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}
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if (mpu0 && !strcmp(fan->ctrl.name, "cpu-rear-fan-0")) {
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fan->min = max(fan->min, (s32)mpu0->rminn_exhaust_fan);
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fan->max = min(fan->max, (s32)mpu0->rmaxn_exhaust_fan);
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goto bail;
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}
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if (mpu1 && !strcmp(fan->ctrl.name, "cpu-rear-fan-1")) {
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fan->min = max(fan->min, (s32)mpu1->rminn_exhaust_fan);
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fan->max = min(fan->max, (s32)mpu1->rmaxn_exhaust_fan);
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goto bail;
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}
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/* Rackmac variants, we just use mpu0 intake */
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if (!strncmp(fan->ctrl.name, "cpu-fan", 7)) {
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fan->min = max(fan->min, (s32)mpu0->rminn_intake_fan);
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fan->max = min(fan->max, (s32)mpu0->rmaxn_intake_fan);
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goto bail;
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}
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bail:
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DBG("wf_fcu: fan min/max for %s set to: [%d..%d] RPM\n",
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fan->ctrl.name, fan->min, fan->max);
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}
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static void wf_fcu_add_fan(struct wf_fcu_priv *pv, const char *name,
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int type, int id)
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{
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struct wf_fcu_fan *fan;
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fan = kzalloc(sizeof(*fan), GFP_KERNEL);
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if (!fan)
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return;
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fan->fcu_priv = pv;
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fan->id = id;
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fan->ctrl.name = name;
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fan->ctrl.priv = fan;
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/* min/max is oddball but the code comes from
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* therm_pm72 which seems to work so ...
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*/
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if (type == FCU_FAN_RPM) {
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if (!strncmp(name, "cpu-pump", strlen("cpu-pump")))
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wf_fcu_get_pump_minmax(fan);
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else
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wf_fcu_get_rpmfan_minmax(fan);
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fan->ctrl.type = WF_CONTROL_RPM_FAN;
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fan->ctrl.ops = &wf_fcu_fan_rpm_ops;
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} else {
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fan->min = 10;
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fan->max = 100;
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fan->ctrl.type = WF_CONTROL_PWM_FAN;
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fan->ctrl.ops = &wf_fcu_fan_pwm_ops;
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}
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if (wf_register_control(&fan->ctrl)) {
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pr_err("wf_fcu: Failed to register fan %s\n", name);
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kfree(fan);
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return;
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}
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list_add(&fan->link, &pv->fan_list);
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kref_get(&pv->ref);
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}
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static void wf_fcu_lookup_fans(struct wf_fcu_priv *pv)
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{
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/* Translation of device-tree location properties to
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* windfarm fan names
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*/
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static const struct {
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const char *dt_name; /* Device-tree name */
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const char *ct_name; /* Control name */
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} loc_trans[] = {
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{ "BACKSIDE", "backside-fan", },
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{ "SYS CTRLR FAN", "backside-fan", },
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{ "DRIVE BAY", "drive-bay-fan", },
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{ "SLOT", "slots-fan", },
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{ "PCI FAN", "slots-fan", },
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{ "CPU A INTAKE", "cpu-front-fan-0", },
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{ "CPU A EXHAUST", "cpu-rear-fan-0", },
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{ "CPU B INTAKE", "cpu-front-fan-1", },
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{ "CPU B EXHAUST", "cpu-rear-fan-1", },
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{ "CPU A PUMP", "cpu-pump-0", },
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{ "CPU B PUMP", "cpu-pump-1", },
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{ "CPU A 1", "cpu-fan-a-0", },
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{ "CPU A 2", "cpu-fan-b-0", },
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{ "CPU A 3", "cpu-fan-c-0", },
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{ "CPU B 1", "cpu-fan-a-1", },
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{ "CPU B 2", "cpu-fan-b-1", },
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{ "CPU B 3", "cpu-fan-c-1", },
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};
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struct device_node *np, *fcu = pv->i2c->dev.of_node;
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int i;
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DBG("Looking up FCU controls in device-tree...\n");
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for_each_child_of_node(fcu, np) {
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int id, type = -1;
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const char *loc;
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const char *name;
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const u32 *reg;
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DBG(" control: %pOFn, type: %s\n", np, of_node_get_device_type(np));
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/* Detect control type */
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if (of_node_is_type(np, "fan-rpm-control") ||
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of_node_is_type(np, "fan-rpm"))
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type = FCU_FAN_RPM;
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if (of_node_is_type(np, "fan-pwm-control") ||
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of_node_is_type(np, "fan-pwm"))
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type = FCU_FAN_PWM;
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/* Only care about fans for now */
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if (type == -1)
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continue;
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/* Lookup for a matching location */
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loc = of_get_property(np, "location", NULL);
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reg = of_get_property(np, "reg", NULL);
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if (loc == NULL || reg == NULL)
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continue;
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DBG(" matching location: %s, reg: 0x%08x\n", loc, *reg);
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for (i = 0; i < ARRAY_SIZE(loc_trans); i++) {
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if (strncmp(loc, loc_trans[i].dt_name,
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strlen(loc_trans[i].dt_name)))
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continue;
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name = loc_trans[i].ct_name;
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DBG(" location match, name: %s\n", name);
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if (type == FCU_FAN_RPM)
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id = ((*reg) - 0x10) / 2;
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else
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id = ((*reg) - 0x30) / 2;
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if (id > 7) {
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pr_warning("wf_fcu: Can't parse "
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"fan ID in device-tree for %pOF\n",
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np);
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break;
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}
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wf_fcu_add_fan(pv, name, type, id);
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break;
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}
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}
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}
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static void wf_fcu_default_fans(struct wf_fcu_priv *pv)
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{
|
|
/* We only support the default fans for PowerMac7,2 */
|
|
if (!of_machine_is_compatible("PowerMac7,2"))
|
|
return;
|
|
|
|
wf_fcu_add_fan(pv, "backside-fan", FCU_FAN_PWM, 1);
|
|
wf_fcu_add_fan(pv, "drive-bay-fan", FCU_FAN_RPM, 2);
|
|
wf_fcu_add_fan(pv, "slots-fan", FCU_FAN_PWM, 2);
|
|
wf_fcu_add_fan(pv, "cpu-front-fan-0", FCU_FAN_RPM, 3);
|
|
wf_fcu_add_fan(pv, "cpu-rear-fan-0", FCU_FAN_RPM, 4);
|
|
wf_fcu_add_fan(pv, "cpu-front-fan-1", FCU_FAN_RPM, 5);
|
|
wf_fcu_add_fan(pv, "cpu-rear-fan-1", FCU_FAN_RPM, 6);
|
|
}
|
|
|
|
static int wf_fcu_init_chip(struct wf_fcu_priv *pv)
|
|
{
|
|
unsigned char buf = 0xff;
|
|
int rc;
|
|
|
|
rc = wf_fcu_write_reg(pv, 0xe, &buf, 1);
|
|
if (rc < 0)
|
|
return -EIO;
|
|
rc = wf_fcu_write_reg(pv, 0x2e, &buf, 1);
|
|
if (rc < 0)
|
|
return -EIO;
|
|
rc = wf_fcu_read_reg(pv, 0, &buf, 1);
|
|
if (rc < 0)
|
|
return -EIO;
|
|
pv->rpm_shift = (buf == 1) ? 2 : 3;
|
|
|
|
pr_debug("wf_fcu: FCU Initialized, RPM fan shift is %d\n",
|
|
pv->rpm_shift);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int wf_fcu_probe(struct i2c_client *client,
|
|
const struct i2c_device_id *id)
|
|
{
|
|
struct wf_fcu_priv *pv;
|
|
|
|
pv = kzalloc(sizeof(*pv), GFP_KERNEL);
|
|
if (!pv)
|
|
return -ENOMEM;
|
|
|
|
kref_init(&pv->ref);
|
|
mutex_init(&pv->lock);
|
|
INIT_LIST_HEAD(&pv->fan_list);
|
|
pv->i2c = client;
|
|
|
|
/*
|
|
* First we must start the FCU which will query the
|
|
* shift value to apply to RPMs
|
|
*/
|
|
if (wf_fcu_init_chip(pv)) {
|
|
pr_err("wf_fcu: Initialization failed !\n");
|
|
kfree(pv);
|
|
return -ENXIO;
|
|
}
|
|
|
|
/* First lookup fans in the device-tree */
|
|
wf_fcu_lookup_fans(pv);
|
|
|
|
/*
|
|
* Older machines don't have the device-tree entries
|
|
* we are looking for, just hard code the list
|
|
*/
|
|
if (list_empty(&pv->fan_list))
|
|
wf_fcu_default_fans(pv);
|
|
|
|
/* Still no fans ? FAIL */
|
|
if (list_empty(&pv->fan_list)) {
|
|
pr_err("wf_fcu: Failed to find fans for your machine\n");
|
|
kfree(pv);
|
|
return -ENODEV;
|
|
}
|
|
|
|
dev_set_drvdata(&client->dev, pv);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int wf_fcu_remove(struct i2c_client *client)
|
|
{
|
|
struct wf_fcu_priv *pv = dev_get_drvdata(&client->dev);
|
|
struct wf_fcu_fan *fan;
|
|
|
|
while (!list_empty(&pv->fan_list)) {
|
|
fan = list_first_entry(&pv->fan_list, struct wf_fcu_fan, link);
|
|
list_del(&fan->link);
|
|
wf_unregister_control(&fan->ctrl);
|
|
}
|
|
kref_put(&pv->ref, wf_fcu_release);
|
|
return 0;
|
|
}
|
|
|
|
static const struct i2c_device_id wf_fcu_id[] = {
|
|
{ "MAC,fcu", 0 },
|
|
{ }
|
|
};
|
|
MODULE_DEVICE_TABLE(i2c, wf_fcu_id);
|
|
|
|
static const struct of_device_id wf_fcu_of_id[] = {
|
|
{ .compatible = "fcu", },
|
|
{ }
|
|
};
|
|
MODULE_DEVICE_TABLE(of, wf_fcu_of_id);
|
|
|
|
static struct i2c_driver wf_fcu_driver = {
|
|
.driver = {
|
|
.name = "wf_fcu",
|
|
.of_match_table = wf_fcu_of_id,
|
|
},
|
|
.probe = wf_fcu_probe,
|
|
.remove = wf_fcu_remove,
|
|
.id_table = wf_fcu_id,
|
|
};
|
|
|
|
module_i2c_driver(wf_fcu_driver);
|
|
|
|
MODULE_AUTHOR("Benjamin Herrenschmidt <benh@kernel.crashing.org>");
|
|
MODULE_DESCRIPTION("FCU control objects for PowerMacs thermal control");
|
|
MODULE_LICENSE("GPL");
|
|
|