![Benjamin Herrenschmidt](/assets/img/avatar_default.png)
This adds a new thermal control framework for PowerMac, along with the implementation for PowerMac8,1, PowerMac8,2 (iMac G5 rev 1 and 2), and PowerMac9,1 (latest single CPU desktop). In the future, I expect to move the older G5 thermal control to the new framework as well. Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org> Signed-off-by: Paul Mackerras <paulus@samba.org>
283 lines
6.6 KiB
C
283 lines
6.6 KiB
C
/*
|
|
* 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 <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 "0.3"
|
|
|
|
#undef DEBUG
|
|
|
|
#ifdef DEBUG
|
|
#define DBG(args...) printk(args)
|
|
#else
|
|
#define DBG(args...) do { } while(0)
|
|
#endif
|
|
|
|
/*
|
|
* 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;
|
|
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 = ∁
|
|
|
|
/* Fill argument buffer */
|
|
memset(buffer, 0, 16);
|
|
buffer[0] = pwm ? 0x10 : 0x00;
|
|
buffer[1] = 0x01 << id;
|
|
*((u16 *)&buffer[2 + id * 2]) = value;
|
|
|
|
rc = smu_queue_cmd(&cmd);
|
|
if (rc)
|
|
return rc;
|
|
wait_for_completion(&comp);
|
|
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;
|
|
s32 *v; u32 *reg;
|
|
char *l;
|
|
|
|
fct = kmalloc(sizeof(struct smu_fan_control), GFP_KERNEL);
|
|
if (fct == NULL)
|
|
return NULL;
|
|
fct->ctrl.ops = &smu_fan_ops;
|
|
l = (char *)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"))
|
|
fct->ctrl.name = "cpu-rear-fan-0";
|
|
else if (!strcmp(l, "Rear Fan 1") || !strcmp(l, "Rear fan 1"))
|
|
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"))
|
|
fct->ctrl.name = "cpu-front-fan-0";
|
|
else if (!strcmp(l, "Front Fan 1") || !strcmp(l, "Front fan 1"))
|
|
fct->ctrl.name = "cpu-front-fan-1";
|
|
else if (!strcmp(l, "Slots Fan") || !strcmp(l, "Slots fan"))
|
|
fct->ctrl.name = "slots-fan";
|
|
else if (!strcmp(l, "Drive Bay") || !strcmp(l, "Drive bay"))
|
|
fct->ctrl.name = "drive-bay-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 = (s32 *)get_property(node, "min-value", NULL);
|
|
if (v == NULL)
|
|
goto fail;
|
|
fct->min = *v;
|
|
v = (s32 *)get_property(node, "max-value", NULL);
|
|
if (v == NULL)
|
|
goto fail;
|
|
fct->max = *v;
|
|
|
|
/* Get "reg" value */
|
|
reg = (u32 *)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"))
|
|
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");
|
|
|