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@@ -0,0 +1,552 @@
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+/*
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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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+
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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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+
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+#define DRVNAME "i5k_amb"
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+
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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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+
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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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+
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+#define AMB_CONFIG_SIZE 2048
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+#define AMB_FUNC_3_OFFSET 768
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+
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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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+
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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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+
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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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+
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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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+
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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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+
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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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+/*
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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 5
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+
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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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+
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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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+
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+struct i5k_amb_data {
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+ struct device *hwmon_dev;
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+
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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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+};
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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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+
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+
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+static DEVICE_ATTR(name, S_IRUGO, show_name, NULL);
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+
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+static struct platform_device *amb_pdev;
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+
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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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+
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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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+
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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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+
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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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+
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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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+
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+ if (temp > 255)
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+ temp = 255;
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+
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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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+
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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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+
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+ if (temp > 255)
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+ temp = 255;
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+
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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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+
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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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+
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+ if (temp > 255)
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+ temp = 255;
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+
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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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+
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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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+
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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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+
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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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+
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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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+
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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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+
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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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+
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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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+
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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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+
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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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+
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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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+
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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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+
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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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+
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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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+
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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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+
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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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+
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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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+
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+ return res;
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+
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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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+
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+ return res;
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+}
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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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+
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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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+
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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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+
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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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+
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|
+static int __devinit i5k_find_amb_registers(struct i5k_amb_data *data)
|
|
|
+{
|
|
|
+ struct pci_dev *pcidev;
|
|
|
+ u32 val32;
|
|
|
+ int res = -ENODEV;
|
|
|
+
|
|
|
+ /* Find AMB register memory space */
|
|
|
+ pcidev = pci_get_device(PCI_VENDOR_ID_INTEL,
|
|
|
+ PCI_DEVICE_ID_INTEL_5000_ERR,
|
|
|
+ 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 int __devinit i5k_amb_probe(struct platform_device *pdev)
|
|
|
+{
|
|
|
+ struct i5k_amb_data *data;
|
|
|
+ struct resource *reso;
|
|
|
+ int res = -ENODEV;
|
|
|
+
|
|
|
+ data = kzalloc(sizeof(*data), GFP_KERNEL);
|
|
|
+ if (!data)
|
|
|
+ return -ENOMEM;
|
|
|
+
|
|
|
+ /* Figure out where the AMB registers live */
|
|
|
+ res = i5k_find_amb_registers(data);
|
|
|
+ if (res)
|
|
|
+ goto err;
|
|
|
+
|
|
|
+ /* Copy the DIMM presence map for the first two channels */
|
|
|
+ res = i5k_channel_probe(&data->amb_present[0],
|
|
|
+ PCI_DEVICE_ID_INTEL_5000_FBD0);
|
|
|
+ if (res)
|
|
|
+ goto err;
|
|
|
+
|
|
|
+ /* Copy the DIMM presence map for the optional second two channels */
|
|
|
+ i5k_channel_probe(&data->amb_present[2],
|
|
|
+ PCI_DEVICE_ID_INTEL_5000_FBD1);
|
|
|
+
|
|
|
+ /* 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);
|
Linus Torvalds