linux/drivers/hwmon/fam15h_power.c
Linus Torvalds cff2f741b8 Driver core updates for 3.8-rc1
Here's the large driver core updates for 3.8-rc1.
 
 The biggest thing here is the various __dev* marking removals.  This is
 going to be a pain for the merge with different subsystem trees, I know,
 but all of the patches included here have been ACKed by their various
 subsystem maintainers, as they wanted them to go through here.
 
 If this is too much of a pain, I can pull all of them out of this tree
 and just send you one with the other fixes/updates and then, after
 3.8-rc1 is out, do the rest of the removals to ensure we catch them all,
 it's up to you.  The merges should all be trivial, and Stephen has been
 doing them all in linux-next for a few weeks now quite easily.
 
 Other than the __dev* marking removals, there's nothing major here, some
 firmware loading updates and other minor things in the driver core.
 
 All of these have (much to Stephen's annoyance), been in linux-next for
 a while.
 
 Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
 -----BEGIN PGP SIGNATURE-----
 Version: GnuPG v2.0.19 (GNU/Linux)
 
 iEYEABECAAYFAlDHkPkACgkQMUfUDdst+ykaWgCfW7AM30cv0nzoVO08ax6KjlG1
 KVYAn3z/KYazvp4B6LMvrW9y0G34Wmad
 =yvVr
 -----END PGP SIGNATURE-----

Merge tag 'driver-core-3.8-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/driver-core

Pull driver core updates from Greg Kroah-Hartman:
 "Here's the large driver core updates for 3.8-rc1.

  The biggest thing here is the various __dev* marking removals.  This
  is going to be a pain for the merge with different subsystem trees, I
  know, but all of the patches included here have been ACKed by their
  various subsystem maintainers, as they wanted them to go through here.

  If this is too much of a pain, I can pull all of them out of this tree
  and just send you one with the other fixes/updates and then, after
  3.8-rc1 is out, do the rest of the removals to ensure we catch them
  all, it's up to you.  The merges should all be trivial, and Stephen
  has been doing them all in linux-next for a few weeks now quite
  easily.

  Other than the __dev* marking removals, there's nothing major here,
  some firmware loading updates and other minor things in the driver
  core.

  All of these have (much to Stephen's annoyance), been in linux-next
  for a while.

  Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>"

Fixed up trivial conflicts in drivers/gpio/gpio-{em,stmpe}.c due to gpio
update.

* tag 'driver-core-3.8-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/driver-core: (93 commits)
  modpost.c: Stop checking __dev* section mismatches
  init.h: Remove __dev* sections from the kernel
  acpi: remove use of __devinit
  PCI: Remove __dev* markings
  PCI: Always build setup-bus when PCI is enabled
  PCI: Move pci_uevent into pci-driver.c
  PCI: Remove CONFIG_HOTPLUG ifdefs
  unicore32/PCI: Remove CONFIG_HOTPLUG ifdefs
  sh/PCI: Remove CONFIG_HOTPLUG ifdefs
  powerpc/PCI: Remove CONFIG_HOTPLUG ifdefs
  mips/PCI: Remove CONFIG_HOTPLUG ifdefs
  microblaze/PCI: Remove CONFIG_HOTPLUG ifdefs
  dma: remove use of __devinit
  dma: remove use of __devexit_p
  firewire: remove use of __devinitdata
  firewire: remove use of __devinit
  leds: remove use of __devexit
  leds: remove use of __devinit
  leds: remove use of __devexit_p
  mmc: remove use of __devexit
  ...
2012-12-11 13:13:55 -08:00

267 lines
7 KiB
C

/*
* fam15h_power.c - AMD Family 15h processor power monitoring
*
* Copyright (c) 2011 Advanced Micro Devices, Inc.
* Author: Andreas Herrmann <herrmann.der.user@googlemail.com>
*
*
* This driver is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License; either
* version 2 of the License, or (at your option) any later version.
*
* This driver is distributed in the hope that 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.
*
* You should have received a copy of the GNU General Public License
* along with this driver; if not, see <http://www.gnu.org/licenses/>.
*/
#include <linux/err.h>
#include <linux/hwmon.h>
#include <linux/hwmon-sysfs.h>
#include <linux/init.h>
#include <linux/module.h>
#include <linux/pci.h>
#include <linux/bitops.h>
#include <asm/processor.h>
MODULE_DESCRIPTION("AMD Family 15h CPU processor power monitor");
MODULE_AUTHOR("Andreas Herrmann <herrmann.der.user@googlemail.com>");
MODULE_LICENSE("GPL");
/* Family 16h Northbridge's function 4 PCI ID */
#define PCI_DEVICE_ID_AMD_16H_NB_F4 0x1534
/* D18F3 */
#define REG_NORTHBRIDGE_CAP 0xe8
/* D18F4 */
#define REG_PROCESSOR_TDP 0x1b8
/* D18F5 */
#define REG_TDP_RUNNING_AVERAGE 0xe0
#define REG_TDP_LIMIT3 0xe8
struct fam15h_power_data {
struct device *hwmon_dev;
unsigned int tdp_to_watts;
unsigned int base_tdp;
unsigned int processor_pwr_watts;
};
static ssize_t show_power(struct device *dev,
struct device_attribute *attr, char *buf)
{
u32 val, tdp_limit, running_avg_range;
s32 running_avg_capture;
u64 curr_pwr_watts;
struct pci_dev *f4 = to_pci_dev(dev);
struct fam15h_power_data *data = dev_get_drvdata(dev);
pci_bus_read_config_dword(f4->bus, PCI_DEVFN(PCI_SLOT(f4->devfn), 5),
REG_TDP_RUNNING_AVERAGE, &val);
running_avg_capture = (val >> 4) & 0x3fffff;
running_avg_capture = sign_extend32(running_avg_capture, 21);
running_avg_range = (val & 0xf) + 1;
pci_bus_read_config_dword(f4->bus, PCI_DEVFN(PCI_SLOT(f4->devfn), 5),
REG_TDP_LIMIT3, &val);
tdp_limit = val >> 16;
curr_pwr_watts = ((u64)(tdp_limit +
data->base_tdp)) << running_avg_range;
curr_pwr_watts -= running_avg_capture;
curr_pwr_watts *= data->tdp_to_watts;
/*
* Convert to microWatt
*
* power is in Watt provided as fixed point integer with
* scaling factor 1/(2^16). For conversion we use
* (10^6)/(2^16) = 15625/(2^10)
*/
curr_pwr_watts = (curr_pwr_watts * 15625) >> (10 + running_avg_range);
return sprintf(buf, "%u\n", (unsigned int) curr_pwr_watts);
}
static DEVICE_ATTR(power1_input, S_IRUGO, show_power, NULL);
static ssize_t show_power_crit(struct device *dev,
struct device_attribute *attr, char *buf)
{
struct fam15h_power_data *data = dev_get_drvdata(dev);
return sprintf(buf, "%u\n", data->processor_pwr_watts);
}
static DEVICE_ATTR(power1_crit, S_IRUGO, show_power_crit, NULL);
static ssize_t show_name(struct device *dev,
struct device_attribute *attr, char *buf)
{
return sprintf(buf, "fam15h_power\n");
}
static DEVICE_ATTR(name, S_IRUGO, show_name, NULL);
static struct attribute *fam15h_power_attrs[] = {
&dev_attr_power1_input.attr,
&dev_attr_power1_crit.attr,
&dev_attr_name.attr,
NULL
};
static const struct attribute_group fam15h_power_attr_group = {
.attrs = fam15h_power_attrs,
};
static bool fam15h_power_is_internal_node0(struct pci_dev *f4)
{
u32 val;
pci_bus_read_config_dword(f4->bus, PCI_DEVFN(PCI_SLOT(f4->devfn), 3),
REG_NORTHBRIDGE_CAP, &val);
if ((val & BIT(29)) && ((val >> 30) & 3))
return false;
return true;
}
/*
* Newer BKDG versions have an updated recommendation on how to properly
* initialize the running average range (was: 0xE, now: 0x9). This avoids
* counter saturations resulting in bogus power readings.
* We correct this value ourselves to cope with older BIOSes.
*/
static const struct pci_device_id affected_device[] = {
{ PCI_VDEVICE(AMD, PCI_DEVICE_ID_AMD_15H_NB_F4) },
{ 0 }
};
static void tweak_runavg_range(struct pci_dev *pdev)
{
u32 val;
/*
* let this quirk apply only to the current version of the
* northbridge, since future versions may change the behavior
*/
if (!pci_match_id(affected_device, pdev))
return;
pci_bus_read_config_dword(pdev->bus,
PCI_DEVFN(PCI_SLOT(pdev->devfn), 5),
REG_TDP_RUNNING_AVERAGE, &val);
if ((val & 0xf) != 0xe)
return;
val &= ~0xf;
val |= 0x9;
pci_bus_write_config_dword(pdev->bus,
PCI_DEVFN(PCI_SLOT(pdev->devfn), 5),
REG_TDP_RUNNING_AVERAGE, val);
}
#ifdef CONFIG_PM
static int fam15h_power_resume(struct pci_dev *pdev)
{
tweak_runavg_range(pdev);
return 0;
}
#else
#define fam15h_power_resume NULL
#endif
static void fam15h_power_init_data(struct pci_dev *f4,
struct fam15h_power_data *data)
{
u32 val;
u64 tmp;
pci_read_config_dword(f4, REG_PROCESSOR_TDP, &val);
data->base_tdp = val >> 16;
tmp = val & 0xffff;
pci_bus_read_config_dword(f4->bus, PCI_DEVFN(PCI_SLOT(f4->devfn), 5),
REG_TDP_LIMIT3, &val);
data->tdp_to_watts = ((val & 0x3ff) << 6) | ((val >> 10) & 0x3f);
tmp *= data->tdp_to_watts;
/* result not allowed to be >= 256W */
if ((tmp >> 16) >= 256)
dev_warn(&f4->dev, "Bogus value for ProcessorPwrWatts "
"(processor_pwr_watts>=%u)\n",
(unsigned int) (tmp >> 16));
/* convert to microWatt */
data->processor_pwr_watts = (tmp * 15625) >> 10;
}
static int fam15h_power_probe(struct pci_dev *pdev,
const struct pci_device_id *id)
{
struct fam15h_power_data *data;
struct device *dev = &pdev->dev;
int err;
/*
* though we ignore every other northbridge, we still have to
* do the tweaking on _each_ node in MCM processors as the counters
* are working hand-in-hand
*/
tweak_runavg_range(pdev);
if (!fam15h_power_is_internal_node0(pdev))
return -ENODEV;
data = devm_kzalloc(dev, sizeof(struct fam15h_power_data), GFP_KERNEL);
if (!data)
return -ENOMEM;
fam15h_power_init_data(pdev, data);
dev_set_drvdata(dev, data);
err = sysfs_create_group(&dev->kobj, &fam15h_power_attr_group);
if (err)
return err;
data->hwmon_dev = hwmon_device_register(dev);
if (IS_ERR(data->hwmon_dev)) {
err = PTR_ERR(data->hwmon_dev);
goto exit_remove_group;
}
return 0;
exit_remove_group:
sysfs_remove_group(&dev->kobj, &fam15h_power_attr_group);
return err;
}
static void fam15h_power_remove(struct pci_dev *pdev)
{
struct device *dev;
struct fam15h_power_data *data;
dev = &pdev->dev;
data = dev_get_drvdata(dev);
hwmon_device_unregister(data->hwmon_dev);
sysfs_remove_group(&dev->kobj, &fam15h_power_attr_group);
}
static DEFINE_PCI_DEVICE_TABLE(fam15h_power_id_table) = {
{ PCI_VDEVICE(AMD, PCI_DEVICE_ID_AMD_15H_NB_F4) },
{ PCI_VDEVICE(AMD, PCI_DEVICE_ID_AMD_16H_NB_F4) },
{}
};
MODULE_DEVICE_TABLE(pci, fam15h_power_id_table);
static struct pci_driver fam15h_power_driver = {
.name = "fam15h_power",
.id_table = fam15h_power_id_table,
.probe = fam15h_power_probe,
.remove = fam15h_power_remove,
.resume = fam15h_power_resume,
};
module_pci_driver(fam15h_power_driver);