/*
* Windfarm PowerMac thermal control. SMU based controls
*
* (c) Copyright 2005 Benjamin Herrenschmidt, IBM Corp.
* <benh@kernel.crashing.org>
*
* Released under the term of the GNU GPL v2.
*/
#include <linux/types.h>
#include <linux/errno.h>
#include <linux/kernel.h>
#include <linux/delay.h>
#include <linux/slab.h>
#include <linux/init.h>
#include <linux/wait.h>
#include <linux/completion.h>
#include <asm/prom.h>
#include <asm/machdep.h>
#include <asm/io.h>
#include <asm/system.h>
#include <asm/sections.h>
#include <asm/smu.h>
#include "windfarm.h"
#define VERSION "0.4"
#undef DEBUG
#ifdef DEBUG
#define DBG(args...) printk(args)
#else
#define DBG(args...) do { } while(0)
#endif
static int smu_supports_new_fans_ops = 1;
/*
* SMU fans control object
*/
static LIST_HEAD(smu_fans);
struct smu_fan_control {
struct list_head link;
int fan_type; /* 0 = rpm, 1 = pwm */
u32 reg; /* index in SMU */
s32 value; /* current value */
s32 min, max; /* min/max values */
struct wf_control ctrl;
};
#define to_smu_fan(c) container_of(c, struct smu_fan_control, ctrl)
static int smu_set_fan(int pwm, u8 id, u16 value)
{
struct smu_cmd cmd;
u8 buffer[16];
DECLARE_COMPLETION(comp);
int rc;
/* Fill SMU command structure */
cmd.cmd = SMU_CMD_FAN_COMMAND;
/* The SMU has an "old" and a "new" way of setting the fan speed
* Unfortunately, I found no reliable way to know which one works
* on a given machine model. After some investigations it appears
* that MacOS X just tries the new one, and if it fails fallbacks
* to the old ones ... Ugh.
*/
retry:
if (smu_supports_new_fans_ops) {
buffer[0] = 0x30;
buffer[1] = id;
*((u16 *)(&buffer[2])) = value;
cmd.data_len = 4;
} else {
if (id > 7)
return -EINVAL;
/* Fill argument buffer */
memset(buffer, 0, 16);
buffer[0] = pwm ? 0x10 : 0x00;
buffer[1] = 0x01 << id;
*((u16 *)&buffer[2 + id * 2]) = value;
cmd.data_len = 14;
}
cmd.reply_len = 16;
cmd.data_buf = cmd.reply_buf = buffer;
cmd.status = 0;
cmd.done = smu_done_complete;
cmd.misc = ∁
rc = smu_queue_cmd(&cmd);
if (rc)
return rc;
wait_for_completion(&comp);
/* Handle fallback (see coment above) */
if (cmd.status != 0 && smu_supports_new_fans_ops) {
printk(KERN_WARNING "windfarm: SMU failed new fan command "
"falling back to old method\n");
smu_supports_new_fans_ops = 0;
goto retry;
}
return cmd.status;
}
static void smu_fan_release(struct wf_control *ct)
{
struct smu_fan_control *fct = to_smu_fan(ct);
kfree(fct);
}
static int smu_fan_set(struct wf_control *ct, s32 value)
{
struct smu_fan_control *fct = to_smu_fan(ct);
if (value < fct->min)
value = fct->min;
if (value > fct->max)
value = fct->max;
fct->value = value;
return smu_set_fan(fct->fan_type, fct->reg, value);
}
static int smu_fan_get(struct wf_control *ct, s32 *value)
{
struct smu_fan_control *fct = to_smu_fan(ct);
*value = fct->value; /* todo: read from SMU */
return 0;
}
static s32 smu_fan_min(struct wf_control *ct)
{
struct smu_fan_control *fct = to_smu_fan(ct);
return fct->min;
}
static s32 smu_fan_max(struct wf_control *ct)
{
struct smu_fan_control *fct = to_smu_fan(ct);
return fct->max;
}
static struct wf_control_ops smu_fan_ops = {
.set_value = smu_fan_set,
.get_value = smu_fan_get,
.get_min = smu_fan_min,
.get_max = smu_fan_max,
.release = smu_fan_release,
.owner = THIS_MODULE,
};
static struct smu_fan_control *smu_fan_create(struct device_node *node,
int pwm_fan)
{
struct smu_fan_control *fct;
const s32 *v;
const u32 *reg;
const char *l;
fct = kmalloc(sizeof(struct smu_fan_control), GFP_KERNEL);
if (fct == NULL)
return NULL;
fct->ctrl.ops = &smu_fan_ops;
l = get_property(node, "location", NULL);
if (l == NULL)
goto fail;
fct->fan_type = pwm_fan;
fct->ctrl.type = pwm_fan ? WF_CONTROL_PWM_FAN : WF_CONTROL_RPM_FAN;
/* We use the name & location here the same way we do for SMU sensors,
* see the comment in windfarm_smu_sensors.c. The locations are a bit
* less consistent here between the iMac and the desktop models, but
* that is good enough for our needs for now at least.
*
* One problem though is that Apple seem to be inconsistent with case
* and the kernel doesn't have strcasecmp =P
*/
fct->ctrl.name = NULL;
/* Names used on desktop models */
if (!strcmp(l, "Rear Fan 0") || !strcmp(l, "Rear Fan") ||
!strcmp(l, "Rear fan 0") || !strcmp(l, "Rear fan") ||
!strcmp(l, "CPU A EXHAUST"))
fct->ctrl.name = "cpu-rear-fan-0";
else if (!strcmp(l, "Rear Fan 1") || !strcmp(l, "Rear fan 1") ||
!strcmp(l, "CPU B EXHAUST"))
fct->ctrl.name = "cpu-rear-fan-1";
else if (!strcmp(l, "Front Fan 0") || !strcmp(l, "Front Fan") ||
!strcmp(l, "Front fan 0") || !strcmp(l, "Front fan") ||
!strcmp(l, "CPU A INTAKE"))
fct->ctrl.name = "cpu-front-fan-0";
else if (!strcmp(l, "Front Fan 1") || !strcmp(l, "Front fan 1") ||
!strcmp(l, "CPU B INTAKE"))
fct->ctrl.name = "cpu-front-fan-1";
else if (!strcmp(l, "CPU A PUMP"))
fct->ctrl.name = "cpu-pump-0";
else if (!strcmp(l, "Slots Fan") || !strcmp(l, "Slots fan") ||
!strcmp(l, "EXPANSION SLOTS INTAKE"))
fct->ctrl.name = "slots-fan";
else if (!strcmp(l, "Drive Bay") || !strcmp(l, "Drive bay") ||
!strcmp(l, "DRIVE BAY A INTAKE"))
fct->ctrl.name = "drive-bay-fan";
else if (!strcmp(l, "BACKSIDE"))
fct->ctrl.name = "backside-fan";
/* Names used on iMac models */
if (!strcmp(l, "System Fan") || !strcmp(l, "System fan"))
fct->ctrl.name = "system-fan";
else if (!strcmp(l, "CPU Fan") || !strcmp(l, "CPU fan"))
fct->ctrl.name = "cpu-fan";
else if (!strcmp(l, "Hard Drive") || !strcmp(l, "Hard drive"))
fct->ctrl.name = "drive-bay-fan";
/* Unrecognized fan, bail out */
if (fct->ctrl.name == NULL)
goto fail;
/* Get min & max values*/
v = get_property(node, "min-value", NULL);
if (v == NULL)
goto fail;
fct->min = *v;
v = get_property(node, "max-value", NULL);
if (v == NULL)
goto fail;
fct->max = *v;
/* Get "reg" value */
reg = get_property(node, "reg", NULL);
if (reg == NULL)
goto fail;
fct->reg = *reg;
if (wf_register_control(&fct->ctrl))
goto fail;
return fct;
fail:
kfree(fct);
return NULL;
}
static int __init smu_controls_init(void)
{
struct device_node *smu, *fans, *fan;
if (!smu_present())
return -ENODEV;
smu = of_find_node_by_type(NULL, "smu");
if (smu == NULL)
return -ENODEV;
/* Look for RPM fans */
for (fans = NULL; (fans = of_get_next_child(smu, fans)) != NULL;)
if (!strcmp(fans->name, "rpm-fans") ||
device_is_compatible(fans, "smu-rpm-fans"))
break;
for (fan = NULL;
fans && (fan = of_get_next_child(fans, fan)) != NULL;) {
struct smu_fan_control *fct;
fct = smu_fan_create(fan, 0);
if (fct == NULL) {
printk(KERN_WARNING "windfarm: Failed to create SMU "
"RPM fan %s\n", fan->name);
continue;
}
list_add(&fct->link, &smu_fans);
}
of_node_put(fans);
/* Look for PWM fans */
for (fans = NULL; (fans = of_get_next_child(smu, fans)) != NULL;)
if (!strcmp(fans->name, "pwm-fans"))
break;
for (fan = NULL;
fans && (fan = of_get_next_child(fans, fan)) != NULL;) {
struct smu_fan_control *fct;
fct = smu_fan_create(fan, 1);
if (fct == NULL) {
printk(KERN_WARNING "windfarm: Failed to create SMU "
"PWM fan %s\n", fan->name);
continue;
}
list_add(&fct->link, &smu_fans);
}
of_node_put(fans);
of_node_put(smu);
return 0;
}
static void __exit smu_controls_exit(void)
{
struct smu_fan_control *fct;
while (!list_empty(&smu_fans)) {
fct = list_entry(smu_fans.next, struct smu_fan_control, link);
list_del(&fct->link);
wf_unregister_control(&fct->ctrl);
}
}
module_init(smu_controls_init);
module_exit(smu_controls_exit);
MODULE_AUTHOR("Benjamin Herrenschmidt <benh@kernel.crashing.org>");
MODULE_DESCRIPTION("SMU control objects for PowerMacs thermal control");
MODULE_LICENSE("GPL");
