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|
/*
* processor_thermal_device.c
* Copyright (c) 2014, Intel Corporation.
*
* This program is free software; you can redistribute it and/or modify it
* under the terms and conditions of the GNU General Public License,
* version 2, as published by the Free Software Foundation.
*
* This program is distributed in the hope it will be useful, but WITHOUT
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
* more details.
*
*/
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/init.h>
#include <linux/pci.h>
#include <linux/interrupt.h>
#include <linux/platform_device.h>
#include <linux/acpi.h>
#include <linux/thermal.h>
#include "int340x_thermal_zone.h"
#include "../intel_soc_dts_iosf.h"
/* Broadwell-U/HSB thermal reporting device */
#define PCI_DEVICE_ID_PROC_BDW_THERMAL 0x1603
#define PCI_DEVICE_ID_PROC_HSB_THERMAL 0x0A03
/* Skylake thermal reporting device */
#define PCI_DEVICE_ID_PROC_SKL_THERMAL 0x1903
/* Braswell thermal reporting device */
#define PCI_DEVICE_ID_PROC_BSW_THERMAL 0x22DC
/* Broxton thermal reporting device */
#define PCI_DEVICE_ID_PROC_BXT0_THERMAL 0x0A8C
#define PCI_DEVICE_ID_PROC_BXT1_THERMAL 0x1A8C
#define PCI_DEVICE_ID_PROC_BXTX_THERMAL 0x4A8C
#define PCI_DEVICE_ID_PROC_BXTP_THERMAL 0x5A8C
struct power_config {
u32 index;
u32 min_uw;
u32 max_uw;
u32 tmin_us;
u32 tmax_us;
u32 step_uw;
};
struct proc_thermal_device {
struct device *dev;
struct acpi_device *adev;
struct power_config power_limits[2];
struct int34x_thermal_zone *int340x_zone;
struct intel_soc_dts_sensors *soc_dts;
};
enum proc_thermal_emum_mode_type {
PROC_THERMAL_NONE,
PROC_THERMAL_PCI,
PROC_THERMAL_PLATFORM_DEV
};
/*
* We can have only one type of enumeration, PCI or Platform,
* not both. So we don't need instance specific data.
*/
static enum proc_thermal_emum_mode_type proc_thermal_emum_mode =
PROC_THERMAL_NONE;
#define POWER_LIMIT_SHOW(index, suffix) \
static ssize_t power_limit_##index##_##suffix##_show(struct device *dev, \
struct device_attribute *attr, \
char *buf) \
{ \
struct pci_dev *pci_dev; \
struct platform_device *pdev; \
struct proc_thermal_device *proc_dev; \
\
if (proc_thermal_emum_mode == PROC_THERMAL_PLATFORM_DEV) { \
pdev = to_platform_device(dev); \
proc_dev = platform_get_drvdata(pdev); \
} else { \
pci_dev = to_pci_dev(dev); \
proc_dev = pci_get_drvdata(pci_dev); \
} \
return sprintf(buf, "%lu\n",\
(unsigned long)proc_dev->power_limits[index].suffix * 1000); \
}
POWER_LIMIT_SHOW(0, min_uw)
POWER_LIMIT_SHOW(0, max_uw)
POWER_LIMIT_SHOW(0, step_uw)
POWER_LIMIT_SHOW(0, tmin_us)
POWER_LIMIT_SHOW(0, tmax_us)
POWER_LIMIT_SHOW(1, min_uw)
POWER_LIMIT_SHOW(1, max_uw)
POWER_LIMIT_SHOW(1, step_uw)
POWER_LIMIT_SHOW(1, tmin_us)
POWER_LIMIT_SHOW(1, tmax_us)
static DEVICE_ATTR_RO(power_limit_0_min_uw);
static DEVICE_ATTR_RO(power_limit_0_max_uw);
static DEVICE_ATTR_RO(power_limit_0_step_uw);
static DEVICE_ATTR_RO(power_limit_0_tmin_us);
static DEVICE_ATTR_RO(power_limit_0_tmax_us);
static DEVICE_ATTR_RO(power_limit_1_min_uw);
static DEVICE_ATTR_RO(power_limit_1_max_uw);
static DEVICE_ATTR_RO(power_limit_1_step_uw);
static DEVICE_ATTR_RO(power_limit_1_tmin_us);
static DEVICE_ATTR_RO(power_limit_1_tmax_us);
static struct attribute *power_limit_attrs[] = {
&dev_attr_power_limit_0_min_uw.attr,
&dev_attr_power_limit_1_min_uw.attr,
&dev_attr_power_limit_0_max_uw.attr,
&dev_attr_power_limit_1_max_uw.attr,
&dev_attr_power_limit_0_step_uw.attr,
&dev_attr_power_limit_1_step_uw.attr,
&dev_attr_power_limit_0_tmin_us.attr,
&dev_attr_power_limit_1_tmin_us.attr,
&dev_attr_power_limit_0_tmax_us.attr,
&dev_attr_power_limit_1_tmax_us.attr,
NULL
};
static const struct attribute_group power_limit_attribute_group = {
.attrs = power_limit_attrs,
.name = "power_limits"
};
static int stored_tjmax; /* since it is fixed, we can have local storage */
static int get_tjmax(void)
{
u32 eax, edx;
u32 val;
int err;
err = rdmsr_safe(MSR_IA32_TEMPERATURE_TARGET, &eax, &edx);
if (err)
return err;
val = (eax >> 16) & 0xff;
if (val)
return val;
return -EINVAL;
}
static int read_temp_msr(int *temp)
{
int cpu;
u32 eax, edx;
int err;
unsigned long curr_temp_off = 0;
*temp = 0;
for_each_online_cpu(cpu) {
err = rdmsr_safe_on_cpu(cpu, MSR_IA32_THERM_STATUS, &eax,
&edx);
if (err)
goto err_ret;
else {
if (eax & 0x80000000) {
curr_temp_off = (eax >> 16) & 0x7f;
if (!*temp || curr_temp_off < *temp)
*temp = curr_temp_off;
} else {
err = -EINVAL;
goto err_ret;
}
}
}
return 0;
err_ret:
return err;
}
static int proc_thermal_get_zone_temp(struct thermal_zone_device *zone,
int *temp)
{
int ret;
ret = read_temp_msr(temp);
if (!ret)
*temp = (stored_tjmax - *temp) * 1000;
return ret;
}
static struct thermal_zone_device_ops proc_thermal_local_ops = {
.get_temp = proc_thermal_get_zone_temp,
};
static int proc_thermal_read_ppcc(struct proc_thermal_device *proc_priv)
{
int i;
acpi_status status;
struct acpi_buffer buf = { ACPI_ALLOCATE_BUFFER, NULL };
union acpi_object *elements, *ppcc;
union acpi_object *p;
int ret = 0;
status = acpi_evaluate_object(proc_priv->adev->handle, "PPCC",
NULL, &buf);
if (ACPI_FAILURE(status))
return -ENODEV;
p = buf.pointer;
if (!p || (p->type != ACPI_TYPE_PACKAGE)) {
dev_err(proc_priv->dev, "Invalid PPCC data\n");
ret = -EFAULT;
goto free_buffer;
}
if (!p->package.count) {
dev_err(proc_priv->dev, "Invalid PPCC package size\n");
ret = -EFAULT;
goto free_buffer;
}
for (i = 0; i < min((int)p->package.count - 1, 2); ++i) {
elements = &(p->package.elements[i+1]);
if (elements->type != ACPI_TYPE_PACKAGE ||
elements->package.count != 6) {
ret = -EFAULT;
goto free_buffer;
}
ppcc = elements->package.elements;
proc_priv->power_limits[i].index = ppcc[0].integer.value;
proc_priv->power_limits[i].min_uw = ppcc[1].integer.value;
proc_priv->power_limits[i].max_uw = ppcc[2].integer.value;
proc_priv->power_limits[i].tmin_us = ppcc[3].integer.value;
proc_priv->power_limits[i].tmax_us = ppcc[4].integer.value;
proc_priv->power_limits[i].step_uw = ppcc[5].integer.value;
}
free_buffer:
kfree(buf.pointer);
return ret;
}
#define PROC_POWER_CAPABILITY_CHANGED 0x83
static void proc_thermal_notify(acpi_handle handle, u32 event, void *data)
{
struct proc_thermal_device *proc_priv = data;
if (!proc_priv)
return;
switch (event) {
case PROC_POWER_CAPABILITY_CHANGED:
proc_thermal_read_ppcc(proc_priv);
int340x_thermal_zone_device_update(proc_priv->int340x_zone,
THERMAL_DEVICE_POWER_CAPABILITY_CHANGED);
break;
default:
dev_err(proc_priv->dev, "Unsupported event [0x%x]\n", event);
break;
}
}
static int proc_thermal_add(struct device *dev,
struct proc_thermal_device **priv)
{
struct proc_thermal_device *proc_priv;
struct acpi_device *adev;
acpi_status status
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