linux-imx

/*

 * Cell MIC driver for ECC counting

 *

 * Copyright 2007 Benjamin Herrenschmidt, IBM Corp.

 *                <benh@kernel.crashing.org>

 *

 * This file may be distributed under the terms of the

 * GNU General Public License.

 */

#undef DEBUG

​

#include <linux/edac.h>

#include <linux/module.h>

#include <linux/init.h>

#include <linux/platform_device.h>

#include <linux/stop_machine.h>

#include <linux/io.h>

#include <linux/of_address.h>

#include <asm/machdep.h>

#include <asm/cell-regs.h>

​

#include "edac_module.h"

​

struct cell_edac_priv

{

    struct cbe_mic_tm_regs __iomem  *regs;

    int             node;

    int             chanmask;

#ifdef DEBUG

    u64             prev_fir;

#endif

};

​

static void cell_edac_count_ce(struct mem_ctl_info *mci, int chan, u64 ar)

{

    struct cell_edac_priv       *priv = mci->pvt_info;

    struct csrow_info       *csrow = mci->csrows[0];

    unsigned long           address, pfn, offset, syndrome;

​

    dev_dbg(mci->pdev, "ECC CE err on node %d, channel %d, ar = 0x%016llx\n",

        priv->node, chan, ar);

​

    /* Address decoding is likely a bit bogus, to dbl check */

    address = (ar & 0xffffffffe0000000ul) >> 29;

    if (priv->chanmask == 0x3)

        address = (address << 1) | chan;

    pfn = address >> PAGE_SHIFT;

    offset = address & ~PAGE_MASK;

    syndrome = (ar & 0x000000001fe00000ul) >> 21;

​

    /* TODO: Decoding of the error address */

    edac_mc_handle_error(HW_EVENT_ERR_CORRECTED, mci, 1,

                 csrow->first_page + pfn, offset, syndrome,

                 0, chan, -1, "", "");

}

​

static void cell_edac_count_ue(struct mem_ctl_info *mci, int chan, u64 ar)

{

    struct cell_edac_priv       *priv = mci->pvt_info;

    struct csrow_info       *csrow = mci->csrows[0];

    unsigned long           address, pfn, offset;

​

    dev_dbg(mci->pdev, "ECC UE err on node %d, channel %d, ar = 0x%016llx\n",

        priv->node, chan, ar);

​

    /* Address decoding is likely a bit bogus, to dbl check */

    address = (ar & 0xffffffffe0000000ul) >> 29;

    if (priv->chanmask == 0x3)

        address = (address << 1) | chan;

    pfn = address >> PAGE_SHIFT;

    offset = address & ~PAGE_MASK;

​

    /* TODO: Decoding of the error address */

    edac_mc_handle_error(HW_EVENT_ERR_UNCORRECTED, mci, 1,

                 csrow->first_page + pfn, offset, 0,

                 0, chan, -1, "", "");

}

​

static void cell_edac_check(struct mem_ctl_info *mci)

{

    struct cell_edac_priv       *priv = mci->pvt_info;

    u64             fir, addreg, clear = 0;

​

    fir = in_be64(&priv->regs->mic_fir);

#ifdef DEBUG

    if (fir != priv->prev_fir) {

        dev_dbg(mci->pdev, "fir change : 0x%016lx\n", fir);

        priv->prev_fir = fir;

    }

#endif

    if ((priv->chanmask & 0x1) && (fir & CBE_MIC_FIR_ECC_SINGLE_0_ERR)) {

        addreg = in_be64(&priv->regs->mic_df_ecc_address_0);