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![Darrick J. Wong](/assets/img/avatar_default.png)
It turns out that we cannot create a pci_driver in this driver because PCI will not call this module's probe function if the i5000-edac driver is already loaded. That said, we only want one value (AMBASE) from the PCI config space. Neither driver alters this value, so it's safe to read it. However, we still want the module aliases, so provide that. Signed-off-by: Darrick J. Wong <djwong@us.ibm.com> Signed-off-by: Jean Delvare <khali@linux-fr.org>
614 lines
16 KiB
C
614 lines
16 KiB
C
/*
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* A hwmon driver for the Intel 5000 series chipset FB-DIMM AMB
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* temperature sensors
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* Copyright (C) 2007 IBM
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*
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* Author: Darrick J. Wong <djwong@us.ibm.com>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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*/
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#include <linux/module.h>
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#include <linux/jiffies.h>
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#include <linux/hwmon.h>
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#include <linux/hwmon-sysfs.h>
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#include <linux/err.h>
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#include <linux/mutex.h>
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#include <linux/delay.h>
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#include <linux/log2.h>
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#include <linux/pci.h>
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#include <linux/platform_device.h>
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#define DRVNAME "i5k_amb"
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#define I5K_REG_AMB_BASE_ADDR 0x48
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#define I5K_REG_AMB_LEN_ADDR 0x50
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#define I5K_REG_CHAN0_PRESENCE_ADDR 0x64
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#define I5K_REG_CHAN1_PRESENCE_ADDR 0x66
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#define AMB_REG_TEMP_MIN_ADDR 0x80
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#define AMB_REG_TEMP_MID_ADDR 0x81
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#define AMB_REG_TEMP_MAX_ADDR 0x82
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#define AMB_REG_TEMP_STATUS_ADDR 0x84
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#define AMB_REG_TEMP_ADDR 0x85
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#define AMB_CONFIG_SIZE 2048
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#define AMB_FUNC_3_OFFSET 768
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static unsigned long amb_reg_temp_status(unsigned int amb)
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{
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return AMB_FUNC_3_OFFSET + AMB_REG_TEMP_STATUS_ADDR +
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AMB_CONFIG_SIZE * amb;
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}
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static unsigned long amb_reg_temp_min(unsigned int amb)
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{
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return AMB_FUNC_3_OFFSET + AMB_REG_TEMP_MIN_ADDR +
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AMB_CONFIG_SIZE * amb;
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}
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static unsigned long amb_reg_temp_mid(unsigned int amb)
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{
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return AMB_FUNC_3_OFFSET + AMB_REG_TEMP_MID_ADDR +
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AMB_CONFIG_SIZE * amb;
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}
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static unsigned long amb_reg_temp_max(unsigned int amb)
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{
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return AMB_FUNC_3_OFFSET + AMB_REG_TEMP_MAX_ADDR +
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AMB_CONFIG_SIZE * amb;
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}
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static unsigned long amb_reg_temp(unsigned int amb)
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{
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return AMB_FUNC_3_OFFSET + AMB_REG_TEMP_ADDR +
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AMB_CONFIG_SIZE * amb;
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}
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#define MAX_MEM_CHANNELS 4
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#define MAX_AMBS_PER_CHANNEL 16
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#define MAX_AMBS (MAX_MEM_CHANNELS * \
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MAX_AMBS_PER_CHANNEL)
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#define CHANNEL_SHIFT 4
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#define DIMM_MASK 0xF
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/*
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* Ugly hack: For some reason the highest bit is set if there
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* are _any_ DIMMs in the channel. Attempting to read from
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* this "high-order" AMB results in a memory bus error, so
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* for now we'll just ignore that top bit, even though that
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* might prevent us from seeing the 16th DIMM in the channel.
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*/
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#define REAL_MAX_AMBS_PER_CHANNEL 15
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#define KNOBS_PER_AMB 6
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static unsigned long amb_num_from_reg(unsigned int byte_num, unsigned int bit)
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{
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return byte_num * MAX_AMBS_PER_CHANNEL + bit;
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}
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#define AMB_SYSFS_NAME_LEN 16
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struct i5k_device_attribute {
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struct sensor_device_attribute s_attr;
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char name[AMB_SYSFS_NAME_LEN];
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};
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struct i5k_amb_data {
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struct device *hwmon_dev;
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unsigned long amb_base;
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unsigned long amb_len;
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u16 amb_present[MAX_MEM_CHANNELS];
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void __iomem *amb_mmio;
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struct i5k_device_attribute *attrs;
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unsigned int num_attrs;
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unsigned long chipset_id;
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};
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static ssize_t show_name(struct device *dev, struct device_attribute *devattr,
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char *buf)
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{
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return sprintf(buf, "%s\n", DRVNAME);
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}
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static DEVICE_ATTR(name, S_IRUGO, show_name, NULL);
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static struct platform_device *amb_pdev;
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static u8 amb_read_byte(struct i5k_amb_data *data, unsigned long offset)
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{
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return ioread8(data->amb_mmio + offset);
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}
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static void amb_write_byte(struct i5k_amb_data *data, unsigned long offset,
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u8 val)
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{
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iowrite8(val, data->amb_mmio + offset);
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}
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static ssize_t show_amb_alarm(struct device *dev,
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struct device_attribute *devattr,
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char *buf)
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{
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struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
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struct i5k_amb_data *data = dev_get_drvdata(dev);
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if (!(amb_read_byte(data, amb_reg_temp_status(attr->index)) & 0x20) &&
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(amb_read_byte(data, amb_reg_temp_status(attr->index)) & 0x8))
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return sprintf(buf, "1\n");
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else
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return sprintf(buf, "0\n");
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}
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static ssize_t store_amb_min(struct device *dev,
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struct device_attribute *devattr,
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const char *buf,
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size_t count)
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{
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struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
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struct i5k_amb_data *data = dev_get_drvdata(dev);
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unsigned long temp = simple_strtoul(buf, NULL, 10) / 500;
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if (temp > 255)
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temp = 255;
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amb_write_byte(data, amb_reg_temp_min(attr->index), temp);
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return count;
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}
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static ssize_t store_amb_mid(struct device *dev,
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struct device_attribute *devattr,
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const char *buf,
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size_t count)
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{
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struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
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struct i5k_amb_data *data = dev_get_drvdata(dev);
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unsigned long temp = simple_strtoul(buf, NULL, 10) / 500;
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if (temp > 255)
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temp = 255;
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amb_write_byte(data, amb_reg_temp_mid(attr->index), temp);
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return count;
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}
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static ssize_t store_amb_max(struct device *dev,
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struct device_attribute *devattr,
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const char *buf,
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size_t count)
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{
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struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
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struct i5k_amb_data *data = dev_get_drvdata(dev);
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unsigned long temp = simple_strtoul(buf, NULL, 10) / 500;
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if (temp > 255)
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temp = 255;
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amb_write_byte(data, amb_reg_temp_max(attr->index), temp);
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return count;
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}
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static ssize_t show_amb_min(struct device *dev,
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struct device_attribute *devattr,
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char *buf)
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{
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struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
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struct i5k_amb_data *data = dev_get_drvdata(dev);
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return sprintf(buf, "%d\n",
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500 * amb_read_byte(data, amb_reg_temp_min(attr->index)));
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}
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static ssize_t show_amb_mid(struct device *dev,
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struct device_attribute *devattr,
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char *buf)
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{
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struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
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struct i5k_amb_data *data = dev_get_drvdata(dev);
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return sprintf(buf, "%d\n",
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500 * amb_read_byte(data, amb_reg_temp_mid(attr->index)));
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}
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static ssize_t show_amb_max(struct device *dev,
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struct device_attribute *devattr,
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char *buf)
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{
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struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
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struct i5k_amb_data *data = dev_get_drvdata(dev);
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return sprintf(buf, "%d\n",
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500 * amb_read_byte(data, amb_reg_temp_max(attr->index)));
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}
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static ssize_t show_amb_temp(struct device *dev,
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struct device_attribute *devattr,
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char *buf)
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{
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struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
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struct i5k_amb_data *data = dev_get_drvdata(dev);
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return sprintf(buf, "%d\n",
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500 * amb_read_byte(data, amb_reg_temp(attr->index)));
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}
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static ssize_t show_label(struct device *dev,
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struct device_attribute *devattr,
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char *buf)
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{
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struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
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return sprintf(buf, "Ch. %d DIMM %d\n", attr->index >> CHANNEL_SHIFT,
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attr->index & DIMM_MASK);
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}
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static int __devinit i5k_amb_hwmon_init(struct platform_device *pdev)
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{
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int i, j, k, d = 0;
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u16 c;
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int res = 0;
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int num_ambs = 0;
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struct i5k_amb_data *data = platform_get_drvdata(pdev);
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/* Count the number of AMBs found */
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/* ignore the high-order bit, see "Ugly hack" comment above */
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for (i = 0; i < MAX_MEM_CHANNELS; i++)
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num_ambs += hweight16(data->amb_present[i] & 0x7fff);
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/* Set up sysfs stuff */
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data->attrs = kzalloc(sizeof(*data->attrs) * num_ambs * KNOBS_PER_AMB,
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GFP_KERNEL);
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if (!data->attrs)
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return -ENOMEM;
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data->num_attrs = 0;
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for (i = 0; i < MAX_MEM_CHANNELS; i++) {
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c = data->amb_present[i];
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for (j = 0; j < REAL_MAX_AMBS_PER_CHANNEL; j++, c >>= 1) {
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struct i5k_device_attribute *iattr;
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k = amb_num_from_reg(i, j);
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if (!(c & 0x1))
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continue;
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d++;
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/* sysfs label */
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iattr = data->attrs + data->num_attrs;
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snprintf(iattr->name, AMB_SYSFS_NAME_LEN,
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"temp%d_label", d);
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iattr->s_attr.dev_attr.attr.name = iattr->name;
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iattr->s_attr.dev_attr.attr.mode = S_IRUGO;
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iattr->s_attr.dev_attr.show = show_label;
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iattr->s_attr.index = k;
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res = device_create_file(&pdev->dev,
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&iattr->s_attr.dev_attr);
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if (res)
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goto exit_remove;
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data->num_attrs++;
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/* Temperature sysfs knob */
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iattr = data->attrs + data->num_attrs;
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snprintf(iattr->name, AMB_SYSFS_NAME_LEN,
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"temp%d_input", d);
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iattr->s_attr.dev_attr.attr.name = iattr->name;
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iattr->s_attr.dev_attr.attr.mode = S_IRUGO;
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iattr->s_attr.dev_attr.show = show_amb_temp;
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iattr->s_attr.index = k;
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res = device_create_file(&pdev->dev,
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&iattr->s_attr.dev_attr);
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if (res)
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goto exit_remove;
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data->num_attrs++;
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/* Temperature min sysfs knob */
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iattr = data->attrs + data->num_attrs;
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snprintf(iattr->name, AMB_SYSFS_NAME_LEN,
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"temp%d_min", d);
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iattr->s_attr.dev_attr.attr.name = iattr->name;
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iattr->s_attr.dev_attr.attr.mode = S_IWUSR | S_IRUGO;
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iattr->s_attr.dev_attr.show = show_amb_min;
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iattr->s_attr.dev_attr.store = store_amb_min;
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iattr->s_attr.index = k;
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res = device_create_file(&pdev->dev,
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&iattr->s_attr.dev_attr);
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if (res)
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goto exit_remove;
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data->num_attrs++;
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/* Temperature mid sysfs knob */
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iattr = data->attrs + data->num_attrs;
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snprintf(iattr->name, AMB_SYSFS_NAME_LEN,
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"temp%d_mid", d);
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iattr->s_attr.dev_attr.attr.name = iattr->name;
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iattr->s_attr.dev_attr.attr.mode = S_IWUSR | S_IRUGO;
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iattr->s_attr.dev_attr.show = show_amb_mid;
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iattr->s_attr.dev_attr.store = store_amb_mid;
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iattr->s_attr.index = k;
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res = device_create_file(&pdev->dev,
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&iattr->s_attr.dev_attr);
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if (res)
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goto exit_remove;
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data->num_attrs++;
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/* Temperature max sysfs knob */
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iattr = data->attrs + data->num_attrs;
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snprintf(iattr->name, AMB_SYSFS_NAME_LEN,
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"temp%d_max", d);
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iattr->s_attr.dev_attr.attr.name = iattr->name;
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iattr->s_attr.dev_attr.attr.mode = S_IWUSR | S_IRUGO;
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iattr->s_attr.dev_attr.show = show_amb_max;
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iattr->s_attr.dev_attr.store = store_amb_max;
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iattr->s_attr.index = k;
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res = device_create_file(&pdev->dev,
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&iattr->s_attr.dev_attr);
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if (res)
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goto exit_remove;
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data->num_attrs++;
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/* Temperature alarm sysfs knob */
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iattr = data->attrs + data->num_attrs;
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snprintf(iattr->name, AMB_SYSFS_NAME_LEN,
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"temp%d_alarm", d);
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iattr->s_attr.dev_attr.attr.name = iattr->name;
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iattr->s_attr.dev_attr.attr.mode = S_IRUGO;
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iattr->s_attr.dev_attr.show = show_amb_alarm;
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iattr->s_attr.index = k;
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res = device_create_file(&pdev->dev,
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&iattr->s_attr.dev_attr);
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if (res)
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goto exit_remove;
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data->num_attrs++;
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}
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}
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res = device_create_file(&pdev->dev, &dev_attr_name);
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if (res)
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goto exit_remove;
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data->hwmon_dev = hwmon_device_register(&pdev->dev);
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if (IS_ERR(data->hwmon_dev)) {
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res = PTR_ERR(data->hwmon_dev);
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goto exit_remove;
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}
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return res;
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exit_remove:
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device_remove_file(&pdev->dev, &dev_attr_name);
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for (i = 0; i < data->num_attrs; i++)
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device_remove_file(&pdev->dev, &data->attrs[i].s_attr.dev_attr);
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kfree(data->attrs);
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return res;
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}
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static int __devinit i5k_amb_add(void)
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{
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int res = -ENODEV;
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/* only ever going to be one of these */
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amb_pdev = platform_device_alloc(DRVNAME, 0);
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if (!amb_pdev)
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return -ENOMEM;
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res = platform_device_add(amb_pdev);
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if (res)
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goto err;
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return 0;
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err:
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platform_device_put(amb_pdev);
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return res;
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}
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static int __devinit i5k_find_amb_registers(struct i5k_amb_data *data,
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unsigned long devid)
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{
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struct pci_dev *pcidev;
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u32 val32;
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int res = -ENODEV;
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/* Find AMB register memory space */
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pcidev = pci_get_device(PCI_VENDOR_ID_INTEL,
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devid,
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NULL);
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if (!pcidev)
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return -ENODEV;
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if (pci_read_config_dword(pcidev, I5K_REG_AMB_BASE_ADDR, &val32))
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goto out;
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data->amb_base = val32;
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if (pci_read_config_dword(pcidev, I5K_REG_AMB_LEN_ADDR, &val32))
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goto out;
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data->amb_len = val32;
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/* Is it big enough? */
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if (data->amb_len < AMB_CONFIG_SIZE * MAX_AMBS) {
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dev_err(&pcidev->dev, "AMB region too small!\n");
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goto out;
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}
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data->chipset_id = devid;
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res = 0;
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out:
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pci_dev_put(pcidev);
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return res;
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}
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static int __devinit i5k_channel_probe(u16 *amb_present, unsigned long dev_id)
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{
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struct pci_dev *pcidev;
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u16 val16;
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int res = -ENODEV;
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/* Copy the DIMM presence map for these two channels */
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pcidev = pci_get_device(PCI_VENDOR_ID_INTEL, dev_id, NULL);
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if (!pcidev)
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return -ENODEV;
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if (pci_read_config_word(pcidev, I5K_REG_CHAN0_PRESENCE_ADDR, &val16))
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goto out;
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amb_present[0] = val16;
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if (pci_read_config_word(pcidev, I5K_REG_CHAN1_PRESENCE_ADDR, &val16))
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goto out;
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amb_present[1] = val16;
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res = 0;
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out:
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pci_dev_put(pcidev);
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return res;
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}
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static unsigned long i5k_channel_pci_id(struct i5k_amb_data *data,
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|
unsigned long channel)
|
|
{
|
|
switch (data->chipset_id) {
|
|
case PCI_DEVICE_ID_INTEL_5000_ERR:
|
|
return PCI_DEVICE_ID_INTEL_5000_FBD0 + channel;
|
|
case PCI_DEVICE_ID_INTEL_5400_ERR:
|
|
return PCI_DEVICE_ID_INTEL_5400_FBD0 + channel;
|
|
default:
|
|
BUG();
|
|
}
|
|
}
|
|
|
|
static unsigned long chipset_ids[] = {
|
|
PCI_DEVICE_ID_INTEL_5000_ERR,
|
|
PCI_DEVICE_ID_INTEL_5400_ERR,
|
|
0
|
|
};
|
|
|
|
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);
|
|
|
|
static int __devinit i5k_amb_probe(struct platform_device *pdev)
|
|
{
|
|
struct i5k_amb_data *data;
|
|
struct resource *reso;
|
|
int i;
|
|
int res = -ENODEV;
|
|
|
|
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]);
|
|
i++;
|
|
} while (res && chipset_ids[i]);
|
|
|
|
if (res)
|
|
goto err;
|
|
|
|
/* Copy the DIMM presence map for the first two channels */
|
|
res = i5k_channel_probe(&data->amb_present[0],
|
|
i5k_channel_pci_id(data, 0));
|
|
if (res)
|
|
goto err;
|
|
|
|
/* Copy the DIMM presence map for the optional second two channels */
|
|
i5k_channel_probe(&data->amb_present[2],
|
|
i5k_channel_pci_id(data, 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);
|