--- /dev/null
+/*
+ * A hwmon driver for the Intel 5000 series chipset FB-DIMM AMB
+ * temperature sensors
+ * Copyright (C) 2007 IBM
+ *
+ * Author: Darrick J. Wong <djwong@us.ibm.com>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
+ */
+
+#include <linux/module.h>
+#include <linux/jiffies.h>
+#include <linux/hwmon.h>
+#include <linux/hwmon-sysfs.h>
+#include <linux/err.h>
+#include <linux/mutex.h>
+#include <linux/delay.h>
+#include <linux/log2.h>
+#include <linux/pci.h>
+#include <linux/platform_device.h>
+
+#define DRVNAME "i5k_amb"
+
+#define I5K_REG_AMB_BASE_ADDR 0x48
+#define I5K_REG_AMB_LEN_ADDR 0x50
+#define I5K_REG_CHAN0_PRESENCE_ADDR 0x64
+#define I5K_REG_CHAN1_PRESENCE_ADDR 0x66
+
+#define AMB_REG_TEMP_MIN_ADDR 0x80
+#define AMB_REG_TEMP_MID_ADDR 0x81
+#define AMB_REG_TEMP_MAX_ADDR 0x82
+#define AMB_REG_TEMP_STATUS_ADDR 0x84
+#define AMB_REG_TEMP_ADDR 0x85
+
+#define AMB_CONFIG_SIZE 2048
+#define AMB_FUNC_3_OFFSET 768
+
+#define AMB_REG_TEMP_STATUS(amb) ((amb) * AMB_CONFIG_SIZE + \
+ AMB_FUNC_3_OFFSET + AMB_REG_TEMP_STATUS_ADDR)
+#define AMB_REG_TEMP_MIN(amb) ((amb) * AMB_CONFIG_SIZE + \
+ AMB_FUNC_3_OFFSET + AMB_REG_TEMP_MIN_ADDR)
+#define AMB_REG_TEMP_MID(amb) ((amb) * AMB_CONFIG_SIZE + \
+ AMB_FUNC_3_OFFSET + AMB_REG_TEMP_MID_ADDR)
+#define AMB_REG_TEMP_MAX(amb) ((amb) * AMB_CONFIG_SIZE + \
+ AMB_FUNC_3_OFFSET + AMB_REG_TEMP_MAX_ADDR)
+#define AMB_REG_TEMP(amb) ((amb) * AMB_CONFIG_SIZE + \
+ AMB_FUNC_3_OFFSET + AMB_REG_TEMP_ADDR)
+
+#define MAX_MEM_CHANNELS 4
+#define MAX_AMBS_PER_CHANNEL 16
+#define MAX_AMBS (MAX_MEM_CHANNELS * \
+ MAX_AMBS_PER_CHANNEL)
+/*
+ * Ugly hack: For some reason the highest bit is set if there
+ * are _any_ DIMMs in the channel. Attempting to read from
+ * this "high-order" AMB results in a memory bus error, so
+ * for now we'll just ignore that top bit, even though that
+ * might prevent us from seeing the 16th DIMM in the channel.
+ */
+#define REAL_MAX_AMBS_PER_CHANNEL 15
+#define KNOBS_PER_AMB 5
+
+#define AMB_NUM_FROM_REG(byte_num, bit_num) ((byte_num) * \
+ MAX_AMBS_PER_CHANNEL) + (bit_num)
+
+#define AMB_SYSFS_NAME_LEN 16
+struct i5k_device_attribute {
+ struct sensor_device_attribute s_attr;
+ char name[AMB_SYSFS_NAME_LEN];
+};
+
+struct i5k_amb_data {
+ struct device *hwmon_dev;
+
+ unsigned long amb_base;
+ unsigned long amb_len;
+ u16 amb_present[MAX_MEM_CHANNELS];
+ void __iomem *amb_mmio;
+ struct i5k_device_attribute *attrs;
+ unsigned int num_attrs;
+};
+
+static ssize_t show_name(struct device *dev, struct device_attribute *devattr,
+ char *buf)
+{
+ return sprintf(buf, "%s\n", DRVNAME);
+}
+
+
+static DEVICE_ATTR(name, S_IRUGO, show_name, NULL);
+
+static struct platform_device *amb_pdev;
+
+static u8 amb_read_byte(struct i5k_amb_data *data, unsigned long offset)
+{
+ return ioread8(data->amb_mmio + offset);
+}
+
+static void amb_write_byte(struct i5k_amb_data *data, unsigned long offset,
+ u8 val)
+{
+ iowrite8(val, data->amb_mmio + offset);
+}
+
+static ssize_t show_amb_alarm(struct device *dev,
+ struct device_attribute *devattr,
+ char *buf)
+{
+ struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
+ struct i5k_amb_data *data = dev_get_drvdata(dev);
+
+ if (!(amb_read_byte(data, AMB_REG_TEMP_STATUS(attr->index)) & 0x20) &&
+ (amb_read_byte(data, AMB_REG_TEMP_STATUS(attr->index)) & 0x8))
+ return sprintf(buf, "1\n");
+ else
+ return sprintf(buf, "0\n");
+}
+
+static ssize_t store_amb_min(struct device *dev,
+ struct device_attribute *devattr,
+ const char *buf,
+ size_t count)
+{
+ struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
+ struct i5k_amb_data *data = dev_get_drvdata(dev);
+ unsigned long temp = simple_strtoul(buf, NULL, 10) / 500;
+
+ if (temp > 255)
+ temp = 255;
+
+ amb_write_byte(data, AMB_REG_TEMP_MIN(attr->index), temp);
+ return count;
+}
+
+static ssize_t store_amb_mid(struct device *dev,
+ struct device_attribute *devattr,
+ const char *buf,
+ size_t count)
+{
+ struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
+ struct i5k_amb_data *data = dev_get_drvdata(dev);
+ unsigned long temp = simple_strtoul(buf, NULL, 10) / 500;
+
+ if (temp > 255)
+ temp = 255;
+
+ amb_write_byte(data, AMB_REG_TEMP_MID(attr->index), temp);
+ return count;
+}
+
+static ssize_t store_amb_max(struct device *dev,
+ struct device_attribute *devattr,
+ const char *buf,
+ size_t count)
+{
+ struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
+ struct i5k_amb_data *data = dev_get_drvdata(dev);
+ unsigned long temp = simple_strtoul(buf, NULL, 10) / 500;
+
+ if (temp > 255)
+ temp = 255;
+
+ amb_write_byte(data, AMB_REG_TEMP_MAX(attr->index), temp);
+ return count;
+}
+
+static ssize_t show_amb_min(struct device *dev,
+ struct device_attribute *devattr,
+ char *buf)
+{
+ struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
+ struct i5k_amb_data *data = dev_get_drvdata(dev);
+ return sprintf(buf, "%d\n",
+ 500 * amb_read_byte(data, AMB_REG_TEMP_MIN(attr->index)));
+}
+
+static ssize_t show_amb_mid(struct device *dev,
+ struct device_attribute *devattr,
+ char *buf)
+{
+ struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
+ struct i5k_amb_data *data = dev_get_drvdata(dev);
+ return sprintf(buf, "%d\n",
+ 500 * amb_read_byte(data, AMB_REG_TEMP_MID(attr->index)));
+}
+
+static ssize_t show_amb_max(struct device *dev,
+ struct device_attribute *devattr,
+ char *buf)
+{
+ struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
+ struct i5k_amb_data *data = dev_get_drvdata(dev);
+ return sprintf(buf, "%d\n",
+ 500 * amb_read_byte(data, AMB_REG_TEMP_MAX(attr->index)));
+}
+
+static ssize_t show_amb_temp(struct device *dev,
+ struct device_attribute *devattr,
+ char *buf)
+{
+ struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
+ struct i5k_amb_data *data = dev_get_drvdata(dev);
+ return sprintf(buf, "%d\n",
+ 500 * amb_read_byte(data, AMB_REG_TEMP(attr->index)));
+}
+
+static int __devinit i5k_amb_hwmon_init(struct platform_device *pdev)
+{
+ int i, j, k, d = 0;
+ u16 c;
+ int res = 0;
+ int num_ambs = 0;
+ struct i5k_amb_data *data = platform_get_drvdata(pdev);
+
+ /* Count the number of AMBs found */
+ /* ignore the high-order bit, see "Ugly hack" comment above */
+ for (i = 0; i < MAX_MEM_CHANNELS; i++)
+ num_ambs += hweight16(data->amb_present[i] & 0x7fff);
+
+ /* Set up sysfs stuff */
+ data->attrs = kzalloc(sizeof(*data->attrs) * num_ambs * KNOBS_PER_AMB,
+ GFP_KERNEL);
+ if (!data->attrs)
+ return -ENOMEM;
+ data->num_attrs = 0;
+
+ for (i = 0; i < MAX_MEM_CHANNELS; i++) {
+ c = data->amb_present[i];
+ for (j = 0; j < REAL_MAX_AMBS_PER_CHANNEL; j++, c >>= 1) {
+ struct i5k_device_attribute *iattr;
+
+ k = AMB_NUM_FROM_REG(i, j);
+ if (!(c & 0x1))
+ continue;
+ d++;
+
+ /* Temperature sysfs knob */
+ iattr = data->attrs + data->num_attrs;
+ snprintf(iattr->name, AMB_SYSFS_NAME_LEN,
+ "temp%d_input", d);
+ iattr->s_attr.dev_attr.attr.name = iattr->name;
+ iattr->s_attr.dev_attr.attr.mode = S_IRUGO;
+ iattr->s_attr.dev_attr.show = show_amb_temp;
+ iattr->s_attr.index = k;
+ res = device_create_file(&pdev->dev,
+ &iattr->s_attr.dev_attr);
+ if (res)
+ goto exit_remove;
+ data->num_attrs++;
+
+ /* Temperature min sysfs knob */
+ iattr = data->attrs + data->num_attrs;
+ snprintf(iattr->name, AMB_SYSFS_NAME_LEN,
+ "temp%d_min", d);
+ iattr->s_attr.dev_attr.attr.name = iattr->name;
+ iattr->s_attr.dev_attr.attr.mode = S_IWUSR | S_IRUGO;
+ iattr->s_attr.dev_attr.show = show_amb_min;
+ iattr->s_attr.dev_attr.store = store_amb_min;
+ iattr->s_attr.index = k;
+ res = device_create_file(&pdev->dev,
+ &iattr->s_attr.dev_attr);
+ if (res)
+ goto exit_remove;
+ data->num_attrs++;
+
+ /* Temperature mid sysfs knob */
+ iattr = data->attrs + data->num_attrs;
+ snprintf(iattr->name, AMB_SYSFS_NAME_LEN,
+ "temp%d_mid", d);
+ iattr->s_attr.dev_attr.attr.name = iattr->name;
+ iattr->s_attr.dev_attr.attr.mode = S_IWUSR | S_IRUGO;
+ iattr->s_attr.dev_attr.show = show_amb_mid;
+ iattr->s_attr.dev_attr.store = store_amb_mid;
+ iattr->s_attr.index = k;
+ res = device_create_file(&pdev->dev,
+ &iattr->s_attr.dev_attr);
+ if (res)
+ goto exit_remove;
+ data->num_attrs++;
+
+ /* Temperature max sysfs knob */
+ iattr = data->attrs + data->num_attrs;
+ snprintf(iattr->name, AMB_SYSFS_NAME_LEN,
+ "temp%d_max", d);
+ iattr->s_attr.dev_attr.attr.name = iattr->name;
+ iattr->s_attr.dev_attr.attr.mode = S_IWUSR | S_IRUGO;
+ iattr->s_attr.dev_attr.show = show_amb_max;
+ iattr->s_attr.dev_attr.store = store_amb_max;
+ iattr->s_attr.index = k;
+ res = device_create_file(&pdev->dev,
+ &iattr->s_attr.dev_attr);
+ if (res)
+ goto exit_remove;
+ data->num_attrs++;
+
+ /* Temperature alarm sysfs knob */
+ iattr = data->attrs + data->num_attrs;
+ snprintf(iattr->name, AMB_SYSFS_NAME_LEN,
+ "temp%d_alarm", d);
+ iattr->s_attr.dev_attr.attr.name = iattr->name;
+ iattr->s_attr.dev_attr.attr.mode = S_IRUGO;
+ iattr->s_attr.dev_attr.show = show_amb_alarm;
+ iattr->s_attr.index = k;
+ res = device_create_file(&pdev->dev,
+ &iattr->s_attr.dev_attr);
+ if (res)
+ goto exit_remove;
+ data->num_attrs++;
+ }
+ }
+
+ res = device_create_file(&pdev->dev, &dev_attr_name);
+ if (res)
+ goto exit_remove;
+
+ data->hwmon_dev = hwmon_device_register(&pdev->dev);
+ if (IS_ERR(data->hwmon_dev)) {
+ res = PTR_ERR(data->hwmon_dev);
+ goto exit_remove;
+ }
+
+ return res;
+
+exit_remove:
+ device_remove_file(&pdev->dev, &dev_attr_name);
+ for (i = 0; i < data->num_attrs; i++)
+ device_remove_file(&pdev->dev, &data->attrs[i].s_attr.dev_attr);
+ kfree(data->attrs);
+
+ return res;
+}
+
+static int __devinit i5k_amb_add(void)
+{
+ int res = -ENODEV;
+
+ /* only ever going to be one of these */
+ amb_pdev = platform_device_alloc(DRVNAME, 0);
+ if (!amb_pdev)
+ return -ENOMEM;
+
+ res = platform_device_add(amb_pdev);
+ if (res)
+ goto err;
+ return 0;
+
+err:
+ platform_device_put(amb_pdev);
+ return res;
+}
+
+static int __devinit i5k_find_amb_registers(struct i5k_amb_data *data)
+{
+ 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);
projects / linux-2.6 / commitdiff