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i5k_amb.c

/*
 * 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

static unsigned long amb_reg_temp_status(unsigned int amb)
{
      return AMB_FUNC_3_OFFSET + AMB_REG_TEMP_STATUS_ADDR +
             AMB_CONFIG_SIZE * amb;
}

static unsigned long amb_reg_temp_min(unsigned int amb)
{
      return AMB_FUNC_3_OFFSET + AMB_REG_TEMP_MIN_ADDR +
             AMB_CONFIG_SIZE * amb;
}

static unsigned long amb_reg_temp_mid(unsigned int amb)
{
      return AMB_FUNC_3_OFFSET + AMB_REG_TEMP_MID_ADDR +
             AMB_CONFIG_SIZE * amb;
}

static unsigned long amb_reg_temp_max(unsigned int amb)
{
      return AMB_FUNC_3_OFFSET + AMB_REG_TEMP_MAX_ADDR +
             AMB_CONFIG_SIZE * amb;
}

static unsigned long amb_reg_temp(unsigned int amb)
{
      return AMB_FUNC_3_OFFSET + AMB_REG_TEMP_ADDR +
             AMB_CONFIG_SIZE * amb;
}

#define MAX_MEM_CHANNELS            4
#define MAX_AMBS_PER_CHANNEL        16
#define MAX_AMBS              (MAX_MEM_CHANNELS * \
                               MAX_AMBS_PER_CHANNEL)
/*
 * 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

static unsigned long amb_num_from_reg(unsigned int byte_num, unsigned int bit)
{
      return byte_num * MAX_AMBS_PER_CHANNEL + bit;
}

#define AMB_SYSFS_NAME_LEN          16
struct i5k_device_attribute {
      struct sensor_device_attribute s_attr;
      char name[AMB_SYSFS_NAME_LEN];
};

struct i5k_amb_data {
      struct device *hwmon_dev;

      unsigned long amb_base;
      unsigned long amb_len;
      u16 amb_present[MAX_MEM_CHANNELS];
      void __iomem *amb_mmio;
      struct i5k_device_attribute *attrs;
      unsigned int num_attrs;
};

static ssize_t show_name(struct device *dev, struct device_attribute *devattr,
                   char *buf)
{
      return sprintf(buf, "%s\n", DRVNAME);
}


static DEVICE_ATTR(name, S_IRUGO, show_name, NULL);

static struct platform_device *amb_pdev;

static u8 amb_read_byte(struct i5k_amb_data *data, unsigned long offset)
{
      return ioread8(data->amb_mmio + offset);
}

static void amb_write_byte(struct i5k_amb_data *data, unsigned long offset,
                     u8 val)
{
      iowrite8(val, data->amb_mmio + offset);
}

static ssize_t show_amb_alarm(struct device *dev,
                       struct device_attribute *devattr,
                       char *buf)
{
      struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
      struct i5k_amb_data *data = dev_get_drvdata(dev);

      if (!(amb_read_byte(data, amb_reg_temp_status(attr->index)) & 0x20) &&
           (amb_read_byte(data, amb_reg_temp_status(attr->index)) & 0x8))
            return sprintf(buf, "1\n");
      else
            return sprintf(buf, "0\n");
}

static ssize_t store_amb_min(struct device *dev,
                       struct device_attribute *devattr,
                       const char *buf,
                       size_t count)
{
      struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
      struct i5k_amb_data *data = dev_get_drvdata(dev);
      unsigned long temp = simple_strtoul(buf, NULL, 10) / 500;

      if (temp > 255)
            temp = 255;

      amb_write_byte(data, amb_reg_temp_min(attr->index), temp);
      return count;
}

static ssize_t store_amb_mid(struct device *dev,
                       struct device_attribute *devattr,
                       const char *buf,
                       size_t count)
{
      struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
      struct i5k_amb_data *data = dev_get_drvdata(dev);
      unsigned long temp = simple_strtoul(buf, NULL, 10) / 500;

      if (temp > 255)
            temp = 255;

      amb_write_byte(data, amb_reg_temp_mid(attr->index), temp);
      return count;
}

static ssize_t store_amb_max(struct device *dev,
                       struct device_attribute *devattr,
                       const char *buf,
                       size_t count)
{
      struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
      struct i5k_amb_data *data = dev_get_drvdata(dev);
      unsigned long temp = simple_strtoul(buf, NULL, 10) / 500;

      if (temp > 255)
            temp = 255;

      amb_write_byte(data, amb_reg_temp_max(attr->index), temp);
      return count;
}

static ssize_t show_amb_min(struct device *dev,
                       struct device_attribute *devattr,
                       char *buf)
{
      struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
      struct i5k_amb_data *data = dev_get_drvdata(dev);
      return sprintf(buf, "%d\n",
            500 * amb_read_byte(data, amb_reg_temp_min(attr->index)));
}

static ssize_t show_amb_mid(struct device *dev,
                       struct device_attribute *devattr,
                       char *buf)
{
      struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
      struct i5k_amb_data *data = dev_get_drvdata(dev);
      return sprintf(buf, "%d\n",
            500 * amb_read_byte(data, amb_reg_temp_mid(attr->index)));
}

static ssize_t show_amb_max(struct device *dev,
                       struct device_attribute *devattr,
                       char *buf)
{
      struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
      struct i5k_amb_data *data = dev_get_drvdata(dev);
      return sprintf(buf, "%d\n",
            500 * amb_read_byte(data, amb_reg_temp_max(attr->index)));
}

static ssize_t show_amb_temp(struct device *dev,
                       struct device_attribute *devattr,
                       char *buf)
{
      struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
      struct i5k_amb_data *data = dev_get_drvdata(dev);
      return sprintf(buf, "%d\n",
            500 * amb_read_byte(data, amb_reg_temp(attr->index)));
}

static 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);

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