linux-imx

/*

 * Intel 7300 class Memory Controllers kernel module (Clarksboro)

 *

 * This file may be distributed under the terms of the

 * GNU General Public License version 2 only.

 *

 * Copyright (c) 2010 by:

 *   Mauro Carvalho Chehab

 *

 * Red Hat Inc. http://www.redhat.com

 *

 * Intel 7300 Chipset Memory Controller Hub (MCH) - Datasheet

 *  http://www.intel.com/Assets/PDF/datasheet/318082.pdf

 *

 * TODO: The chipset allow checking for PCI Express errors also. Currently,

 *   the driver covers only memory error errors

 *

 * This driver uses "csrows" EDAC attribute to represent DIMM slot#

 */

​

#include <linux/module.h>

#include <linux/init.h>

#include <linux/pci.h>

#include <linux/pci_ids.h>

#include <linux/slab.h>

#include <linux/edac.h>

#include <linux/mmzone.h>

​

#include "edac_module.h"

​

/*

 * Alter this version for the I7300 module when modifications are made

 */

#define I7300_REVISION    " Ver: 1.0.0"

​

#define EDAC_MOD_STR      "i7300_edac"

​

#define i7300_printk(level, fmt, arg...) \

    edac_printk(level, "i7300", fmt, ##arg)

​

#define i7300_mc_printk(mci, level, fmt, arg...) \

    edac_mc_chipset_printk(mci, level, "i7300", fmt, ##arg)

​

/***********************************************

 * i7300 Limit constants Structs and static vars

 ***********************************************/

​

/*

 * Memory topology is organized as:

 *  Branch 0 - 2 channels: channels 0 and 1 (FDB0 PCI dev 21.0)

 *  Branch 1 - 2 channels: channels 2 and 3 (FDB1 PCI dev 22.0)

 * Each channel can have to 8 DIMM sets (called as SLOTS)

 * Slots should generally be filled in pairs

 *  Except on Single Channel mode of operation

 *      just slot 0/channel0 filled on this mode

 *  On normal operation mode, the two channels on a branch should be

 *      filled together for the same SLOT#

 * When in mirrored mode, Branch 1 replicate memory at Branch 0, so, the four

 *      channels on both branches should be filled

 */

​

/* Limits for i7300 */

#define MAX_SLOTS       8

#define MAX_BRANCHES        2

#define MAX_CH_PER_BRANCH   2

#define MAX_CHANNELS        (MAX_CH_PER_BRANCH * MAX_BRANCHES)

#define MAX_MIR         3

​

#define to_channel(ch, branch)  ((((branch)) << 1) | (ch))

​

#define to_csrow(slot, ch, branch)                  \

        (to_channel(ch, branch) | ((slot) << 2))

​

/* Device name and register DID (Device ID) */

struct i7300_dev_info {

    const char *ctl_name;   /* name for this device */

    u16 fsb_mapping_errors; /* DID for the branchmap,control */

};

​

/* Table of devices attributes supported by this driver */

static const struct i7300_dev_info i7300_devs[] = {

    {

        .ctl_name = "I7300",

        .fsb_mapping_errors = PCI_DEVICE_ID_INTEL_I7300_MCH_ERR,

    },

};

​

struct i7300_dimm_info {

    int megabytes;      /* size, 0 means not present  */

};

​

/* driver private data structure */