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freebsd-dev/sys/powerpc/powermac/fcu.c
Nathan Whitehorn 815d7d92c1 Update the I2C-based temperature/fan drivers to connect to the Powermac 
thermal control module. This provides automatic fan management on all G5
PowerMacs and Xserves.
2011-05-29 18:35:57 +00:00

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/*-
* Copyright (c) 2010 Andreas Tobler
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
* BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
* LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
* AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
* OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*/
#include <sys/cdefs.h>
__FBSDID("$FreeBSD$");
#include <sys/param.h>
#include <sys/bus.h>
#include <sys/systm.h>
#include <sys/module.h>
#include <sys/callout.h>
#include <sys/conf.h>
#include <sys/cpu.h>
#include <sys/ctype.h>
#include <sys/kernel.h>
#include <sys/reboot.h>
#include <sys/rman.h>
#include <sys/sysctl.h>
#include <sys/limits.h>
#include <machine/bus.h>
#include <machine/md_var.h>
#include <dev/iicbus/iicbus.h>
#include <dev/iicbus/iiconf.h>
#include <dev/ofw/openfirm.h>
#include <dev/ofw/ofw_bus.h>
#include <powerpc/powermac/powermac_thermal.h>
/* FCU registers
* /u3@0,f8000000/i2c@f8001000/fan@15e
*/
#define FCU_RPM_FAIL 0x0b /* fans states in bits 0<1-6>7 */
#define FCU_RPM_AVAILABLE 0x0c
#define FCU_RPM_ACTIVE 0x0d
#define FCU_RPM_READ(x) 0x11 + (x) * 2
#define FCU_RPM_SET(x) 0x10 + (x) * 2
#define FCU_PWM_FAIL 0x2b
#define FCU_PWM_AVAILABLE 0x2c
#define FCU_PWM_ACTIVE 0x2d
#define FCU_PWM_RPM(x) 0x31 + (x) * 2 /* Get RPM. */
#define FCU_PWM_SGET(x) 0x30 + (x) * 2 /* Set or get PWM. */
struct fcu_fan {
struct pmac_fan fan;
device_t dev;
int id;
enum {
FCU_FAN_RPM,
FCU_FAN_PWM
} type;
int setpoint;
int rpm;
};
struct fcu_softc {
device_t sc_dev;
struct intr_config_hook enum_hook;
uint32_t sc_addr;
struct fcu_fan *sc_fans;
int sc_nfans;
};
/* We can read the PWM and the RPM from a PWM controlled fan.
* Offer both values via sysctl.
*/
enum {
FCU_PWM_SYSCTL_PWM = 1 << 8,
FCU_PWM_SYSCTL_RPM = 2 << 8
};
static int fcu_rpm_shift;
/* Regular bus attachment functions */
static int fcu_probe(device_t);
static int fcu_attach(device_t);
/* Utility functions */
static void fcu_attach_fans(device_t dev);
static int fcu_fill_fan_prop(device_t dev);
static int fcu_fan_set_rpm(struct fcu_fan *fan, int rpm);
static int fcu_fan_get_rpm(struct fcu_fan *fan);
static int fcu_fan_set_pwm(struct fcu_fan *fan, int pwm);
static int fcu_fan_get_pwm(device_t dev, struct fcu_fan *fan, int *pwm,
int *rpm);
static int fcu_fanrpm_sysctl(SYSCTL_HANDLER_ARGS);
static void fcu_start(void *xdev);
static int fcu_write(device_t dev, uint32_t addr, uint8_t reg, uint8_t *buf,
int len);
static int fcu_read_1(device_t dev, uint32_t addr, uint8_t reg, uint8_t *data);
static device_method_t fcu_methods[] = {
/* Device interface */
DEVMETHOD(device_probe, fcu_probe),
DEVMETHOD(device_attach, fcu_attach),
{ 0, 0 },
};
static driver_t fcu_driver = {
"fcu",
fcu_methods,
sizeof(struct fcu_softc)
};
static devclass_t fcu_devclass;
DRIVER_MODULE(fcu, iicbus, fcu_driver, fcu_devclass, 0, 0);
MALLOC_DEFINE(M_FCU, "fcu", "FCU Sensor Information");
static int
fcu_write(device_t dev, uint32_t addr, uint8_t reg, uint8_t *buff,
int len)
{
unsigned char buf[4];
struct iic_msg msg[] = {
{ addr, IIC_M_WR, 0, buf }
};
msg[0].len = len + 1;
buf[0] = reg;
memcpy(buf + 1, buff, len);
if (iicbus_transfer(dev, msg, 1) != 0) {
device_printf(dev, "iicbus write failed\n");
return (EIO);
}
return (0);
}
static int
fcu_read_1(device_t dev, uint32_t addr, uint8_t reg, uint8_t *data)
{
uint8_t buf[4];
struct iic_msg msg[2] = {
{ addr, IIC_M_WR | IIC_M_NOSTOP, 1, &reg },
{ addr, IIC_M_RD, 1, buf },
};
if (iicbus_transfer(dev, msg, 2) != 0) {
device_printf(dev, "iicbus read failed\n");
return (EIO);
}
*data = *((uint8_t*)buf);
return (0);
}
static int
fcu_probe(device_t dev)
{
const char *name, *compatible;
struct fcu_softc *sc;
name = ofw_bus_get_name(dev);
compatible = ofw_bus_get_compat(dev);
if (!name)
return (ENXIO);
if (strcmp(name, "fan") != 0 || strcmp(compatible, "fcu") != 0)
return (ENXIO);
sc = device_get_softc(dev);
sc->sc_dev = dev;
sc->sc_addr = iicbus_get_addr(dev);
device_set_desc(dev, "Apple Fan Control Unit");
return (0);
}
static int
fcu_attach(device_t dev)
{
struct fcu_softc *sc;
sc = device_get_softc(dev);
sc->enum_hook.ich_func = fcu_start;
sc->enum_hook.ich_arg = dev;
/* We have to wait until interrupts are enabled. I2C read and write
* only works if the interrupts are available.
* The unin/i2c is controlled by the htpic on unin. But this is not
* the master. The openpic on mac-io is controlling the htpic.
* This one gets attached after the mac-io probing and then the
* interrupts will be available.
*/
if (config_intrhook_establish(&sc->enum_hook) != 0)
return (ENOMEM);
return (0);
}
static void
fcu_start(void *xdev)
{
unsigned char buf[1] = { 0xff };
struct fcu_softc *sc;
device_t dev = (device_t)xdev;
sc = device_get_softc(dev);
/* Start the fcu device. */
fcu_write(sc->sc_dev, sc->sc_addr, 0xe, buf, 1);
fcu_write(sc->sc_dev, sc->sc_addr, 0x2e, buf, 1);
fcu_read_1(sc->sc_dev, sc->sc_addr, 0, buf);
fcu_rpm_shift = (buf[0] == 1) ? 2 : 3;
device_printf(dev, "FCU initialized, RPM shift: %d\n",
fcu_rpm_shift);
/* Detect and attach child devices. */
fcu_attach_fans(dev);
config_intrhook_disestablish(&sc->enum_hook);
}
static int
fcu_fan_set_rpm(struct fcu_fan *fan, int rpm)
{
uint8_t reg;
struct fcu_softc *sc;
unsigned char buf[2];
sc = device_get_softc(fan->dev);
/* Clamp to allowed range */
rpm = max(fan->fan.min_rpm, rpm);
rpm = min(fan->fan.max_rpm, rpm);
if (fan->type == FCU_FAN_RPM) {
reg = FCU_RPM_SET(fan->id);
fan->setpoint = rpm;
} else {
device_printf(fan->dev, "Unknown fan type: %d\n", fan->type);
return (EIO);
}
buf[0] = rpm >> (8 - fcu_rpm_shift);
buf[1] = rpm << fcu_rpm_shift;
fcu_write(sc->sc_dev, sc->sc_addr, reg, buf, 2);
return (0);
}
static int
fcu_fan_get_rpm(struct fcu_fan *fan)
{
uint8_t reg;
struct fcu_softc *sc;
uint8_t buff[2] = { 0, 0 };
uint8_t active = 0, avail = 0, fail = 0;
int rpm;
sc = device_get_softc(fan->dev);
if (fan->type == FCU_FAN_RPM) {
/* Check if the fan is available. */
reg = FCU_RPM_AVAILABLE;
fcu_read_1(sc->sc_dev, sc->sc_addr, reg, &avail);
if ((avail & (1 << fan->id)) == 0) {
device_printf(fan->dev,
"RPM Fan not available ID: %d\n", fan->id);
return (-1);
}
/* Check if we have a failed fan. */
reg = FCU_RPM_FAIL;
fcu_read_1(sc->sc_dev, sc->sc_addr, reg, &fail);
if ((fail & (1 << fan->id)) != 0) {
device_printf(fan->dev,
"RPM Fan failed ID: %d\n", fan->id);
return (-1);
}
/* Check if fan is active. */
reg = FCU_RPM_ACTIVE;
fcu_read_1(sc->sc_dev, sc->sc_addr, reg, &active);
if ((active & (1 << fan->id)) == 0) {
device_printf(fan->dev, "RPM Fan not active ID: %d\n",
fan->id);
return (-1);
}
reg = FCU_RPM_READ(fan->id);
} else {
device_printf(fan->dev, "Unknown fan type: %d\n", fan->type);
return (-1);
}
/* It seems that we can read the fans rpm. */
fcu_read_1(sc->sc_dev, sc->sc_addr, reg, buff);
rpm = (buff[0] << (8 - fcu_rpm_shift)) | buff[1] >> fcu_rpm_shift;
return (rpm);
}
static int
fcu_fan_set_pwm(struct fcu_fan *fan, int pwm)
{
uint8_t reg;
struct fcu_softc *sc;
uint8_t buf[2];
sc = device_get_softc(fan->dev);
/* Clamp to allowed range */
pwm = max(fan->fan.min_rpm, pwm);
pwm = min(fan->fan.max_rpm, pwm);
if (fan->type == FCU_FAN_PWM) {
reg = FCU_PWM_SGET(fan->id);
if (pwm > 100)
pwm = 100;
if (pwm < 30)
pwm = 30;
fan->setpoint = pwm;
} else {
device_printf(fan->dev, "Unknown fan type: %d\n", fan->type);
return (EIO);
}
buf[0] = (pwm * 2550) / 1000;
fcu_write(sc->sc_dev, sc->sc_addr, reg, buf, 1);
return (0);
}
static int
fcu_fan_get_pwm(device_t dev, struct fcu_fan *fan, int *pwm, int *rpm)
{
uint8_t reg;
struct fcu_softc *sc;
uint8_t buf[2];
uint8_t active = 0, avail = 0, fail = 0;
sc = device_get_softc(dev);
if (fan->type == FCU_FAN_PWM) {
/* Check if the fan is available. */
reg = FCU_PWM_AVAILABLE;
fcu_read_1(sc->sc_dev, sc->sc_addr, reg, &avail);
if ((avail & (1 << fan->id)) == 0) {
device_printf(dev, "PWM Fan not available ID: %d\n",
fan->id);
return (EIO);
}
/* Check if we have a failed fan. */
reg = FCU_PWM_FAIL;
fcu_read_1(sc->sc_dev, sc->sc_addr, reg, &fail);
if ((fail & (1 << fan->id)) != 0) {
device_printf(dev, "PWM Fan failed ID: %d\n", fan->id);
return (EIO);
}
/* Check if fan is active. */
reg = FCU_PWM_ACTIVE;
fcu_read_1(sc->sc_dev, sc->sc_addr, reg, &active);
if ((active & (1 << fan->id)) == 0) {
device_printf(dev, "PWM Fan not active ID: %d\n",
fan->id);
return (ENXIO);
}
reg = FCU_PWM_SGET(fan->id);
} else {
device_printf(dev, "Unknown fan type: %d\n", fan->type);
return (EIO);
}
/* It seems that we can read the fans pwm. */
fcu_read_1(sc->sc_dev, sc->sc_addr, reg, buf);
*pwm = (buf[0] * 1000) / 2550;
/* Now read the rpm. */
reg = FCU_PWM_RPM(fan->id);
fcu_read_1(sc->sc_dev, sc->sc_addr, reg, buf);
*rpm = (buf[0] << (8 - fcu_rpm_shift)) | buf[1] >> fcu_rpm_shift;
return (0);
}
/*
* This function returns the number of fans. If we call it the second time
* and we have allocated memory for sc->sc_fans, we fill in the properties.
*/
static int
fcu_fill_fan_prop(device_t dev)
{
phandle_t child;
struct fcu_softc *sc;
u_int id[8];
char location[96];
char type[64];
int i = 0, j, len = 0, prop_len, prev_len = 0;
sc = device_get_softc(dev);
child = ofw_bus_get_node(dev);
/* Fill the fan location property. */
prop_len = OF_getprop(child, "hwctrl-location", location,
sizeof(location));
while (len < prop_len) {
if (sc->sc_fans != NULL) {
strcpy(sc->sc_fans[i].fan.name, location + len);
}
prev_len = strlen(location + len) + 1;
len += prev_len;
i++;
}
if (sc->sc_fans == NULL)
return (i);
/* Fill the fan type property. */
len = 0;
i = 0;
prev_len = 0;
prop_len = OF_getprop(child, "hwctrl-type", type, sizeof(type));
while (len < prop_len) {
if (strcmp(type + len, "fan-rpm") == 0)
sc->sc_fans[i].type = FCU_FAN_RPM;
else
sc->sc_fans[i].type = FCU_FAN_PWM;
prev_len = strlen(type + len) + 1;
len += prev_len;
i++;
}
/* Fill the fan ID property. */
prop_len = OF_getprop(child, "hwctrl-id", id, sizeof(id));
for (j = 0; j < i; j++)
sc->sc_fans[j].id = ((id[j] >> 8) & 0x0f) % 8;
/* Fill the fan zone property. */
prop_len = OF_getprop(child, "hwctrl-zone", id, sizeof(id));
for (j = 0; j < i; j++)
sc->sc_fans[j].fan.zone = id[j];
/* Finish setting up fan properties */
for (j = 0; j < i; j++) {
sc->sc_fans[j].dev = sc->sc_dev;
if (sc->sc_fans[j].type == FCU_FAN_RPM) {
sc->sc_fans[j].fan.min_rpm = 4800 >> fcu_rpm_shift;
sc->sc_fans[j].fan.max_rpm = 56000 >> fcu_rpm_shift;
sc->sc_fans[j].setpoint =
fcu_fan_get_rpm(&sc->sc_fans[j]);
sc->sc_fans[j].fan.read =
(int (*)(struct pmac_fan *))(fcu_fan_get_rpm);
sc->sc_fans[j].fan.set =
(int (*)(struct pmac_fan *, int))(fcu_fan_set_rpm);
} else {
sc->sc_fans[j].fan.min_rpm = 40; /* Percent */
sc->sc_fans[j].fan.max_rpm = 100;
sc->sc_fans[j].fan.read = NULL;
sc->sc_fans[j].fan.set =
(int (*)(struct pmac_fan *, int))(fcu_fan_set_pwm);
}
sc->sc_fans[j].fan.default_rpm = sc->sc_fans[j].fan.max_rpm;
}
return (i);
}
static int
fcu_fanrpm_sysctl(SYSCTL_HANDLER_ARGS)
{
device_t fcu;
struct fcu_softc *sc;
struct fcu_fan *fan;
int rpm = 0, pwm = 0, error;
fcu = arg1;
sc = device_get_softc(fcu);
fan = &sc->sc_fans[arg2 & 0x00ff];
if (fan->type == FCU_FAN_RPM) {
rpm = fcu_fan_get_rpm(fan);
error = sysctl_handle_int(oidp, &rpm, 0, req);
} else {
fcu_fan_get_pwm(fcu, fan, &pwm, &rpm);
switch (arg2 & 0xff00) {
case FCU_PWM_SYSCTL_PWM:
error = sysctl_handle_int(oidp, &pwm, 0, req);
break;
case FCU_PWM_SYSCTL_RPM:
error = sysctl_handle_int(oidp, &rpm, 0, req);
break;
default:
/* This should never happen */
error = -1;
};
}
/* We can only read the RPM from a PWM controlled fan, so return. */
if ((arg2 & 0xff00) == FCU_PWM_SYSCTL_RPM)
return (0);
if (error || !req->newptr)
return (error);
if (fan->type == FCU_FAN_RPM)
return (fcu_fan_set_rpm(fan, rpm));
else
return (fcu_fan_set_pwm(fan, pwm));
}
static void
fcu_attach_fans(device_t dev)
{
struct fcu_softc *sc;
struct sysctl_oid *oid, *fanroot_oid;
struct sysctl_ctx_list *ctx;
char sysctl_name[32];
int i, j;
sc = device_get_softc(dev);
sc->sc_nfans = 0;
/* Count the actual number of fans. */
sc->sc_nfans = fcu_fill_fan_prop(dev);
device_printf(dev, "%d fans detected!\n", sc->sc_nfans);
if (sc->sc_nfans == 0) {
device_printf(dev, "WARNING: No fans detected!\n");
return;
}
sc->sc_fans = malloc(sc->sc_nfans * sizeof(struct fcu_fan), M_FCU,
M_WAITOK | M_ZERO);
ctx = device_get_sysctl_ctx(dev);
fanroot_oid = SYSCTL_ADD_NODE(ctx,
SYSCTL_CHILDREN(device_get_sysctl_tree(dev)), OID_AUTO, "fans",
CTLFLAG_RD, 0, "FCU Fan Information");
/* Now we can fill the properties into the allocated struct. */
sc->sc_nfans = fcu_fill_fan_prop(dev);
/* Register fans with pmac_thermal */
for (i = 0; i < sc->sc_nfans; i++)
pmac_thermal_fan_register(&sc->sc_fans[i].fan);
/* Add sysctls for the fans. */
for (i = 0; i < sc->sc_nfans; i++) {
for (j = 0; j < strlen(sc->sc_fans[i].fan.name); j++) {
sysctl_name[j] = tolower(sc->sc_fans[i].fan.name[j]);
if (isspace(sysctl_name[j]))
sysctl_name[j] = '_';
}
sysctl_name[j] = 0;
if (sc->sc_fans[i].type == FCU_FAN_RPM) {
oid = SYSCTL_ADD_NODE(ctx, SYSCTL_CHILDREN(fanroot_oid),
OID_AUTO, sysctl_name,
CTLFLAG_RD, 0, "Fan Information");
SYSCTL_ADD_INT(ctx, SYSCTL_CHILDREN(oid), OID_AUTO,
"minrpm", CTLTYPE_INT | CTLFLAG_RD,
&(sc->sc_fans[i].fan.min_rpm),
sizeof(int), "Minimum allowed RPM");
SYSCTL_ADD_INT(ctx, SYSCTL_CHILDREN(oid), OID_AUTO,
"maxrpm", CTLTYPE_INT | CTLFLAG_RD,
&(sc->sc_fans[i].fan.max_rpm),
sizeof(int), "Maximum allowed RPM");
/* I use i to pass the fan id. */
SYSCTL_ADD_PROC(ctx, SYSCTL_CHILDREN(oid), OID_AUTO,
"rpm", CTLTYPE_INT | CTLFLAG_RW, dev, i,
fcu_fanrpm_sysctl, "I", "Fan RPM");
} else {
fcu_fan_get_pwm(dev, &sc->sc_fans[i],
&sc->sc_fans[i].setpoint,
&sc->sc_fans[i].rpm);
oid = SYSCTL_ADD_NODE(ctx, SYSCTL_CHILDREN(fanroot_oid),
OID_AUTO, sysctl_name,
CTLFLAG_RD, 0, "Fan Information");
SYSCTL_ADD_INT(ctx, SYSCTL_CHILDREN(oid), OID_AUTO,
"minpwm", CTLTYPE_INT | CTLFLAG_RD,
&(sc->sc_fans[i].fan.min_rpm),
sizeof(int), "Minimum allowed PWM in %");
SYSCTL_ADD_INT(ctx, SYSCTL_CHILDREN(oid), OID_AUTO,
"maxpwm", CTLTYPE_INT | CTLFLAG_RD,
&(sc->sc_fans[i].fan.max_rpm),
sizeof(int), "Maximum allowed PWM in %");
/* I use i to pass the fan id or'ed with the type
* of info I want to display/modify.
*/
SYSCTL_ADD_PROC(ctx, SYSCTL_CHILDREN(oid), OID_AUTO,
"pwm", CTLTYPE_INT | CTLFLAG_RW, dev,
FCU_PWM_SYSCTL_PWM | i,
fcu_fanrpm_sysctl, "I", "Fan PWM in %");
SYSCTL_ADD_PROC(ctx, SYSCTL_CHILDREN(oid), OID_AUTO,
"rpm", CTLTYPE_INT | CTLFLAG_RD, dev,
FCU_PWM_SYSCTL_RPM | i,
fcu_fanrpm_sysctl, "I", "Fan RPM");
}
}
/* Dump fan location, type & RPM. */
if (bootverbose) {
device_printf(dev, "Fans\n");
for (i = 0; i < sc->sc_nfans; i++) {
device_printf(dev, "Location: %s type: %d ID: %d "
"RPM: %d\n", sc->sc_fans[i].fan.name,
sc->sc_fans[i].type, sc->sc_fans[i].id,
(sc->sc_fans[i].type == FCU_FAN_RPM) ?
sc->sc_fans[i].setpoint :
sc->sc_fans[i].rpm );
}
}
}
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