624 lines
16 KiB
C
624 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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#include <linux/slab.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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sysfs_attr_init(&iattr->s_attr.dev_attr.attr);
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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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sysfs_attr_init(&iattr->s_attr.dev_attr.attr);
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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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sysfs_attr_init(&iattr->s_attr.dev_attr.attr);
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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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sysfs_attr_init(&iattr->s_attr.dev_attr.attr);
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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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sysfs_attr_init(&iattr->s_attr.dev_attr.attr);
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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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sysfs_attr_init(&iattr->s_attr.dev_attr.attr);
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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)
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{
|
|
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
|
|
};
|
|
|
|
#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;
|
|
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);
|