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/*

 * 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);