linux-imx

/*

 * A hwmon driver for the Intel 5000 series chipset FB-DIMM AMB

 * temperature sensors

 * Copyright (C) 2007 IBM

 *

 * Author: Darrick J. Wong <darrick.wong@oracle.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/hwmon.h>

#include <linux/hwmon-sysfs.h>

#include <linux/err.h>

#include <linux/mutex.h>

#include <linux/log2.h>

#include <linux/pci.h>

#include <linux/platform_device.h>

#include <linux/slab.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)

#define CHANNEL_SHIFT           4

#define DIMM_MASK           0xF

/*

 * 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