linux/drivers/hwmon/i5k_amb.c

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/*
* A hwmon driver for the Intel 5000 series chipset FB-DIMM AMB
* temperature sensors
* Copyright (C) 2007 IBM
*
* Author: Darrick J. Wong <djwong@us.ibm.com>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program 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 program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*/
#include <linux/module.h>
#include <linux/jiffies.h>
#include <linux/hwmon.h>
#include <linux/hwmon-sysfs.h>
#include <linux/err.h>
#include <linux/mutex.h>
#include <linux/delay.h>
#include <linux/log2.h>
#include <linux/pci.h>
#include <linux/platform_device.h>
include cleanup: Update gfp.h and slab.h includes to prepare for breaking implicit slab.h inclusion from percpu.h percpu.h is included by sched.h and module.h and thus ends up being included when building most .c files. percpu.h includes slab.h which in turn includes gfp.h making everything defined by the two files universally available and complicating inclusion dependencies. percpu.h -> slab.h dependency is about to be removed. Prepare for this change by updating users of gfp and slab facilities include those headers directly instead of assuming availability. As this conversion needs to touch large number of source files, the following script is used as the basis of conversion. http://userweb.kernel.org/~tj/misc/slabh-sweep.py The script does the followings. * Scan files for gfp and slab usages and update includes such that only the necessary includes are there. ie. if only gfp is used, gfp.h, if slab is used, slab.h. * When the script inserts a new include, it looks at the include blocks and try to put the new include such that its order conforms to its surrounding. It's put in the include block which contains core kernel includes, in the same order that the rest are ordered - alphabetical, Christmas tree, rev-Xmas-tree or at the end if there doesn't seem to be any matching order. * If the script can't find a place to put a new include (mostly because the file doesn't have fitting include block), it prints out an error message indicating which .h file needs to be added to the file. The conversion was done in the following steps. 1. The initial automatic conversion of all .c files updated slightly over 4000 files, deleting around 700 includes and adding ~480 gfp.h and ~3000 slab.h inclusions. The script emitted errors for ~400 files. 2. Each error was manually checked. Some didn't need the inclusion, some needed manual addition while adding it to implementation .h or embedding .c file was more appropriate for others. This step added inclusions to around 150 files. 3. The script was run again and the output was compared to the edits from #2 to make sure no file was left behind. 4. Several build tests were done and a couple of problems were fixed. e.g. lib/decompress_*.c used malloc/free() wrappers around slab APIs requiring slab.h to be added manually. 5. The script was run on all .h files but without automatically editing them as sprinkling gfp.h and slab.h inclusions around .h files could easily lead to inclusion dependency hell. Most gfp.h inclusion directives were ignored as stuff from gfp.h was usually wildly available and often used in preprocessor macros. Each slab.h inclusion directive was examined and added manually as necessary. 6. percpu.h was updated not to include slab.h. 7. Build test were done on the following configurations and failures were fixed. CONFIG_GCOV_KERNEL was turned off for all tests (as my distributed build env didn't work with gcov compiles) and a few more options had to be turned off depending on archs to make things build (like ipr on powerpc/64 which failed due to missing writeq). * x86 and x86_64 UP and SMP allmodconfig and a custom test config. * powerpc and powerpc64 SMP allmodconfig * sparc and sparc64 SMP allmodconfig * ia64 SMP allmodconfig * s390 SMP allmodconfig * alpha SMP allmodconfig * um on x86_64 SMP allmodconfig 8. percpu.h modifications were reverted so that it could be applied as a separate patch and serve as bisection point. Given the fact that I had only a couple of failures from tests on step 6, I'm fairly confident about the coverage of this conversion patch. If there is a breakage, it's likely to be something in one of the arch headers which should be easily discoverable easily on most builds of the specific arch. Signed-off-by: Tejun Heo <tj@kernel.org> Guess-its-ok-by: Christoph Lameter <cl@linux-foundation.org> Cc: Ingo Molnar <mingo@redhat.com> Cc: Lee Schermerhorn <Lee.Schermerhorn@hp.com>
2010-03-24 08:04:11 +00:00
#include <linux/slab.h>
#define DRVNAME "i5k_amb"
#define I5K_REG_AMB_BASE_ADDR 0x48
#define I5K_REG_AMB_LEN_ADDR 0x50
#define I5K_REG_CHAN0_PRESENCE_ADDR 0x64
#define I5K_REG_CHAN1_PRESENCE_ADDR 0x66
#define AMB_REG_TEMP_MIN_ADDR 0x80
#define AMB_REG_TEMP_MID_ADDR 0x81
#define AMB_REG_TEMP_MAX_ADDR 0x82
#define AMB_REG_TEMP_STATUS_ADDR 0x84
#define AMB_REG_TEMP_ADDR 0x85
#define AMB_CONFIG_SIZE 2048
#define AMB_FUNC_3_OFFSET 768
static unsigned long amb_reg_temp_status(unsigned int amb)
{
return AMB_FUNC_3_OFFSET + AMB_REG_TEMP_STATUS_ADDR +
AMB_CONFIG_SIZE * amb;
}
static unsigned long amb_reg_temp_min(unsigned int amb)
{
return AMB_FUNC_3_OFFSET + AMB_REG_TEMP_MIN_ADDR +
AMB_CONFIG_SIZE * amb;
}
static unsigned long amb_reg_temp_mid(unsigned int amb)
{
return AMB_FUNC_3_OFFSET + AMB_REG_TEMP_MID_ADDR +
AMB_CONFIG_SIZE * amb;
}
static unsigned long amb_reg_temp_max(unsigned int amb)
{
return AMB_FUNC_3_OFFSET + AMB_REG_TEMP_MAX_ADDR +
AMB_CONFIG_SIZE * amb;
}
static unsigned long amb_reg_temp(unsigned int amb)
{
return AMB_FUNC_3_OFFSET + AMB_REG_TEMP_ADDR +
AMB_CONFIG_SIZE * amb;
}
#define MAX_MEM_CHANNELS 4
#define MAX_AMBS_PER_CHANNEL 16
#define MAX_AMBS (MAX_MEM_CHANNELS * \
MAX_AMBS_PER_CHANNEL)
#define CHANNEL_SHIFT 4
#define DIMM_MASK 0xF
/*
* Ugly hack: For some reason the highest bit is set if there
* are _any_ DIMMs in the channel. Attempting to read from
* this "high-order" AMB results in a memory bus error, so
* for now we'll just ignore that top bit, even though that
* might prevent us from seeing the 16th DIMM in the channel.
*/
#define REAL_MAX_AMBS_PER_CHANNEL 15
#define KNOBS_PER_AMB 6
static unsigned long amb_num_from_reg(unsigned int byte_num, unsigned int bit)
{
return byte_num * MAX_AMBS_PER_CHANNEL + bit;
}
#define AMB_SYSFS_NAME_LEN 16
struct i5k_device_attribute {
struct sensor_device_attribute s_attr;
char name[AMB_SYSFS_NAME_LEN];
};
struct i5k_amb_data {
struct device *hwmon_dev;
unsigned long amb_base;
unsigned long amb_len;
u16 amb_present[MAX_MEM_CHANNELS];
void __iomem *amb_mmio;
struct i5k_device_attribute *attrs;
unsigned int num_attrs;
};
static ssize_t show_name(struct device *dev, struct device_attribute *devattr,
char *buf)
{
return sprintf(buf, "%s\n", DRVNAME);
}
static DEVICE_ATTR(name, S_IRUGO, show_name, NULL);
static struct platform_device *amb_pdev;
static u8 amb_read_byte(struct i5k_amb_data *data, unsigned long offset)
{
return ioread8(data->amb_mmio + offset);
}
static void amb_write_byte(struct i5k_amb_data *data, unsigned long offset,
u8 val)
{
iowrite8(val, data->amb_mmio + offset);
}
static ssize_t show_amb_alarm(struct device *dev,
struct device_attribute *devattr,
char *buf)
{
struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
struct i5k_amb_data *data = dev_get_drvdata(dev);
if (!(amb_read_byte(data, amb_reg_temp_status(attr->index)) & 0x20) &&
(amb_read_byte(data, amb_reg_temp_status(attr->index)) & 0x8))
return sprintf(buf, "1\n");
else
return sprintf(buf, "0\n");
}
static ssize_t store_amb_min(struct device *dev,
struct device_attribute *devattr,
const char *buf,
size_t count)
{
struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
struct i5k_amb_data *data = dev_get_drvdata(dev);
unsigned long temp = simple_strtoul(buf, NULL, 10) / 500;
if (temp > 255)
temp = 255;
amb_write_byte(data, amb_reg_temp_min(attr->index), temp);
return count;
}
static ssize_t store_amb_mid(struct device *dev,
struct device_attribute *devattr,
const char *buf,
size_t count)
{
struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
struct i5k_amb_data *data = dev_get_drvdata(dev);
unsigned long temp = simple_strtoul(buf, NULL, 10) / 500;
if (temp > 255)
temp = 255;
amb_write_byte(data, amb_reg_temp_mid(attr->index), temp);
return count;
}
static ssize_t store_amb_max(struct device *dev,
struct device_attribute *devattr,
const char *buf,
size_t count)
{
struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
struct i5k_amb_data *data = dev_get_drvdata(dev);
unsigned long temp = simple_strtoul(buf, NULL, 10) / 500;
if (temp > 255)
temp = 255;
amb_write_byte(data, amb_reg_temp_max(attr->index), temp);
return count;
}
static ssize_t show_amb_min(struct device *dev,
struct device_attribute *devattr,
char *buf)
{
struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
struct i5k_amb_data *data = dev_get_drvdata(dev);
return sprintf(buf, "%d\n",
500 * amb_read_byte(data, amb_reg_temp_min(attr->index)));
}
static ssize_t show_amb_mid(struct device *dev,
struct device_attribute *devattr,
char *buf)
{
struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
struct i5k_amb_data *data = dev_get_drvdata(dev);
return sprintf(buf, "%d\n",
500 * amb_read_byte(data, amb_reg_temp_mid(attr->index)));
}
static ssize_t show_amb_max(struct device *dev,
struct device_attribute *devattr,
char *buf)
{
struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
struct i5k_amb_data *data = dev_get_drvdata(dev);
return sprintf(buf, "%d\n",
500 * amb_read_byte(data, amb_reg_temp_max(attr->index)));
}
static ssize_t show_amb_temp(struct device *dev,
struct device_attribute *devattr,
char *buf)
{
struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
struct i5k_amb_data *data = dev_get_drvdata(dev);
return sprintf(buf, "%d\n",
500 * amb_read_byte(data, amb_reg_temp(attr->index)));
}
static ssize_t show_label(struct device *dev,
struct device_attribute *devattr,
char *buf)
{
struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
return sprintf(buf, "Ch. %d DIMM %d\n", attr->index >> CHANNEL_SHIFT,
attr->index & DIMM_MASK);
}
static int __devinit i5k_amb_hwmon_init(struct platform_device *pdev)
{
int i, j, k, d = 0;
u16 c;
int res = 0;
int num_ambs = 0;
struct i5k_amb_data *data = platform_get_drvdata(pdev);
/* Count the number of AMBs found */
/* ignore the high-order bit, see "Ugly hack" comment above */
for (i = 0; i < MAX_MEM_CHANNELS; i++)
num_ambs += hweight16(data->amb_present[i] & 0x7fff);
/* Set up sysfs stuff */
data->attrs = kzalloc(sizeof(*data->attrs) * num_ambs * KNOBS_PER_AMB,
GFP_KERNEL);
if (!data->attrs)
return -ENOMEM;
data->num_attrs = 0;
for (i = 0; i < MAX_MEM_CHANNELS; i++) {
c = data->amb_present[i];
for (j = 0; j < REAL_MAX_AMBS_PER_CHANNEL; j++, c >>= 1) {
struct i5k_device_attribute *iattr;
k = amb_num_from_reg(i, j);
if (!(c & 0x1))
continue;
d++;
/* sysfs label */
iattr = data->attrs + data->num_attrs;
snprintf(iattr->name, AMB_SYSFS_NAME_LEN,
"temp%d_label", d);
iattr->s_attr.dev_attr.attr.name = iattr->name;
iattr->s_attr.dev_attr.attr.mode = S_IRUGO;
iattr->s_attr.dev_attr.show = show_label;
iattr->s_attr.index = k;
sysfs_attr_init(&iattr->s_attr.dev_attr.attr);
res = device_create_file(&pdev->dev,
&iattr->s_attr.dev_attr);
if (res)
goto exit_remove;
data->num_attrs++;
/* Temperature sysfs knob */
iattr = data->attrs + data->num_attrs;
snprintf(iattr->name, AMB_SYSFS_NAME_LEN,
"temp%d_input", d);
iattr->s_attr.dev_attr.attr.name = iattr->name;
iattr->s_attr.dev_attr.attr.mode = S_IRUGO;
iattr->s_attr.dev_attr.show = show_amb_temp;
iattr->s_attr.index = k;
sysfs_attr_init(&iattr->s_attr.dev_attr.attr);
res = device_create_file(&pdev->dev,
&iattr->s_attr.dev_attr);
if (res)
goto exit_remove;
data->num_attrs++;
/* Temperature min sysfs knob */
iattr = data->attrs + data->num_attrs;
snprintf(iattr->name, AMB_SYSFS_NAME_LEN,
"temp%d_min", d);
iattr->s_attr.dev_attr.attr.name = iattr->name;
iattr->s_attr.dev_attr.attr.mode = S_IWUSR | S_IRUGO;
iattr->s_attr.dev_attr.show = show_amb_min;
iattr->s_attr.dev_attr.store = store_amb_min;
iattr->s_attr.index = k;
sysfs_attr_init(&iattr->s_attr.dev_attr.attr);
res = device_create_file(&pdev->dev,
&iattr->s_attr.dev_attr);
if (res)
goto exit_remove;
data->num_attrs++;
/* Temperature mid sysfs knob */
iattr = data->attrs + data->num_attrs;
snprintf(iattr->name, AMB_SYSFS_NAME_LEN,
"temp%d_mid", d);
iattr->s_attr.dev_attr.attr.name = iattr->name;
iattr->s_attr.dev_attr.attr.mode = S_IWUSR | S_IRUGO;
iattr->s_attr.dev_attr.show = show_amb_mid;
iattr->s_attr.dev_attr.store = store_amb_mid;
iattr->s_attr.index = k;
sysfs_attr_init(&iattr->s_attr.dev_attr.attr);
res = device_create_file(&pdev->dev,
&iattr->s_attr.dev_attr);
if (res)
goto exit_remove;
data->num_attrs++;
/* Temperature max sysfs knob */
iattr = data->attrs + data->num_attrs;
snprintf(iattr->name, AMB_SYSFS_NAME_LEN,
"temp%d_max", d);
iattr->s_attr.dev_attr.attr.name = iattr->name;
iattr->s_attr.dev_attr.attr.mode = S_IWUSR | S_IRUGO;
iattr->s_attr.dev_attr.show = show_amb_max;
iattr->s_attr.dev_attr.store = store_amb_max;
iattr->s_attr.index = k;
sysfs_attr_init(&iattr->s_attr.dev_attr.attr);
res = device_create_file(&pdev->dev,
&iattr->s_attr.dev_attr);
if (res)
goto exit_remove;
data->num_attrs++;
/* Temperature alarm sysfs knob */
iattr = data->attrs + data->num_attrs;
snprintf(iattr->name, AMB_SYSFS_NAME_LEN,
"temp%d_alarm", d);
iattr->s_attr.dev_attr.attr.name = iattr->name;
iattr->s_attr.dev_attr.attr.mode = S_IRUGO;
iattr->s_attr.dev_attr.show = show_amb_alarm;
iattr->s_attr.index = k;
sysfs_attr_init(&iattr->s_attr.dev_attr.attr);
res = device_create_file(&pdev->dev,
&iattr->s_attr.dev_attr);
if (res)
goto exit_remove;
data->num_attrs++;
}
}
res = device_create_file(&pdev->dev, &dev_attr_name);
if (res)
goto exit_remove;
data->hwmon_dev = hwmon_device_register(&pdev->dev);
if (IS_ERR(data->hwmon_dev)) {
res = PTR_ERR(data->hwmon_dev);
goto exit_remove;
}
return res;
exit_remove:
device_remove_file(&pdev->dev, &dev_attr_name);
for (i = 0; i < data->num_attrs; i++)
device_remove_file(&pdev->dev, &data->attrs[i].s_attr.dev_attr);
kfree(data->attrs);
return res;
}
static int __devinit i5k_amb_add(void)
{
int res = -ENODEV;
/* only ever going to be one of these */
amb_pdev = platform_device_alloc(DRVNAME, 0);
if (!amb_pdev)
return -ENOMEM;
res = platform_device_add(amb_pdev);
if (res)
goto err;
return 0;
err:
platform_device_put(amb_pdev);
return res;
}
static int __devinit i5k_find_amb_registers(struct i5k_amb_data *data,
unsigned long devid)
{
struct pci_dev *pcidev;
u32 val32;
int res = -ENODEV;
/* Find AMB register memory space */
pcidev = pci_get_device(PCI_VENDOR_ID_INTEL,
devid,
NULL);
if (!pcidev)
return -ENODEV;
if (pci_read_config_dword(pcidev, I5K_REG_AMB_BASE_ADDR, &val32))
goto out;
data->amb_base = val32;
if (pci_read_config_dword(pcidev, I5K_REG_AMB_LEN_ADDR, &val32))
goto out;
data->amb_len = val32;
/* Is it big enough? */
if (data->amb_len < AMB_CONFIG_SIZE * MAX_AMBS) {
dev_err(&pcidev->dev, "AMB region too small!\n");
goto out;
}
res = 0;
out:
pci_dev_put(pcidev);
return res;
}
static int __devinit i5k_channel_probe(u16 *amb_present, unsigned long dev_id)
{
struct pci_dev *pcidev;
u16 val16;
int res = -ENODEV;
/* Copy the DIMM presence map for these two channels */
pcidev = pci_get_device(PCI_VENDOR_ID_INTEL, dev_id, NULL);
if (!pcidev)
return -ENODEV;
if (pci_read_config_word(pcidev, I5K_REG_CHAN0_PRESENCE_ADDR, &val16))
goto out;
amb_present[0] = val16;
if (pci_read_config_word(pcidev, I5K_REG_CHAN1_PRESENCE_ADDR, &val16))
goto out;
amb_present[1] = val16;
res = 0;
out:
pci_dev_put(pcidev);
return res;
}
static struct {
unsigned long err;
unsigned long fbd0;
} chipset_ids[] __devinitdata = {
{ PCI_DEVICE_ID_INTEL_5000_ERR, PCI_DEVICE_ID_INTEL_5000_FBD0 },
{ PCI_DEVICE_ID_INTEL_5400_ERR, PCI_DEVICE_ID_INTEL_5400_FBD0 },
{ 0, 0 }
};
#ifdef MODULE
static struct pci_device_id i5k_amb_ids[] __devinitdata = {
{ PCI_DEVICE(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_5000_ERR) },
{ PCI_DEVICE(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_5400_ERR) },
{ 0, }
};
MODULE_DEVICE_TABLE(pci, i5k_amb_ids);
#endif
static int __devinit i5k_amb_probe(struct platform_device *pdev)
{
struct i5k_amb_data *data;
struct resource *reso;
int i, res;
data = kzalloc(sizeof(*data), GFP_KERNEL);
if (!data)
return -ENOMEM;
/* Figure out where the AMB registers live */
i = 0;
do {
res = i5k_find_amb_registers(data, chipset_ids[i].err);
if (res == 0)
break;
i++;
} while (chipset_ids[i].err);
if (res)
goto err;
/* Copy the DIMM presence map for the first two channels */
res = i5k_channel_probe(&data->amb_present[0], chipset_ids[i].fbd0);
if (res)
goto err;
/* Copy the DIMM presence map for the optional second two channels */
i5k_channel_probe(&data->amb_present[2], chipset_ids[i].fbd0 + 1);
/* Set up resource regions */
reso = request_mem_region(data->amb_base, data->amb_len, DRVNAME);
if (!reso) {
res = -EBUSY;
goto err;
}
data->amb_mmio = ioremap_nocache(data->amb_base, data->amb_len);
if (!data->amb_mmio) {
res = -EBUSY;
goto err_map_failed;
}
platform_set_drvdata(pdev, data);
res = i5k_amb_hwmon_init(pdev);
if (res)
goto err_init_failed;
return res;
err_init_failed:
iounmap(data->amb_mmio);
platform_set_drvdata(pdev, NULL);
err_map_failed:
release_mem_region(data->amb_base, data->amb_len);
err:
kfree(data);
return res;
}
static int __devexit i5k_amb_remove(struct platform_device *pdev)
{
int i;
struct i5k_amb_data *data = platform_get_drvdata(pdev);
hwmon_device_unregister(data->hwmon_dev);
device_remove_file(&pdev->dev, &dev_attr_name);
for (i = 0; i < data->num_attrs; i++)
device_remove_file(&pdev->dev, &data->attrs[i].s_attr.dev_attr);
kfree(data->attrs);
iounmap(data->amb_mmio);
release_mem_region(data->amb_base, data->amb_len);
platform_set_drvdata(pdev, NULL);
kfree(data);
return 0;
}
static struct platform_driver i5k_amb_driver = {
.driver = {
.owner = THIS_MODULE,
.name = DRVNAME,
},
.probe = i5k_amb_probe,
.remove = __devexit_p(i5k_amb_remove),
};
static int __init i5k_amb_init(void)
{
int res;
res = platform_driver_register(&i5k_amb_driver);
if (res)
return res;
res = i5k_amb_add();
if (res)
platform_driver_unregister(&i5k_amb_driver);
return res;
}
static void __exit i5k_amb_exit(void)
{
platform_device_unregister(amb_pdev);
platform_driver_unregister(&i5k_amb_driver);
}
MODULE_AUTHOR("Darrick J. Wong <djwong@us.ibm.com>");
MODULE_DESCRIPTION("Intel 5000 chipset FB-DIMM AMB temperature sensor");
MODULE_LICENSE("GPL");
module_init(i5k_amb_init);
module_exit(i5k_amb_exit);