linux/drivers/edac/highbank_l2_edac.c
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   1/*
   2 * Copyright 2011-2012 Calxeda, Inc.
   3 *
   4 * This program is free software; you can redistribute it and/or modify it
   5 * under the terms and conditions of the GNU General Public License,
   6 * version 2, as published by the Free Software Foundation.
   7 *
   8 * This program is distributed in the hope it will be useful, but WITHOUT
   9 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  10 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
  11 * more details.
  12 *
  13 * You should have received a copy of the GNU General Public License along with
  14 * this program.  If not, see <http://www.gnu.org/licenses/>.
  15 */
  16#include <linux/types.h>
  17#include <linux/kernel.h>
  18#include <linux/ctype.h>
  19#include <linux/edac.h>
  20#include <linux/interrupt.h>
  21#include <linux/platform_device.h>
  22#include <linux/of_platform.h>
  23
  24#include "edac_core.h"
  25#include "edac_module.h"
  26
  27#define SR_CLR_SB_ECC_INTR      0x0
  28#define SR_CLR_DB_ECC_INTR      0x4
  29
  30struct hb_l2_drvdata {
  31        void __iomem *base;
  32        int sb_irq;
  33        int db_irq;
  34};
  35
  36static irqreturn_t highbank_l2_err_handler(int irq, void *dev_id)
  37{
  38        struct edac_device_ctl_info *dci = dev_id;
  39        struct hb_l2_drvdata *drvdata = dci->pvt_info;
  40
  41        if (irq == drvdata->sb_irq) {
  42                writel(1, drvdata->base + SR_CLR_SB_ECC_INTR);
  43                edac_device_handle_ce(dci, 0, 0, dci->ctl_name);
  44        }
  45        if (irq == drvdata->db_irq) {
  46                writel(1, drvdata->base + SR_CLR_DB_ECC_INTR);
  47                edac_device_handle_ue(dci, 0, 0, dci->ctl_name);
  48        }
  49
  50        return IRQ_HANDLED;
  51}
  52
  53static const struct of_device_id hb_l2_err_of_match[] = {
  54        { .compatible = "calxeda,hb-sregs-l2-ecc", },
  55        {},
  56};
  57MODULE_DEVICE_TABLE(of, hb_l2_err_of_match);
  58
  59static int highbank_l2_err_probe(struct platform_device *pdev)
  60{
  61        const struct of_device_id *id;
  62        struct edac_device_ctl_info *dci;
  63        struct hb_l2_drvdata *drvdata;
  64        struct resource *r;
  65        int res = 0;
  66
  67        dci = edac_device_alloc_ctl_info(sizeof(*drvdata), "cpu",
  68                1, "L", 1, 2, NULL, 0, 0);
  69        if (!dci)
  70                return -ENOMEM;
  71
  72        drvdata = dci->pvt_info;
  73        dci->dev = &pdev->dev;
  74        platform_set_drvdata(pdev, dci);
  75
  76        if (!devres_open_group(&pdev->dev, NULL, GFP_KERNEL))
  77                return -ENOMEM;
  78
  79        r = platform_get_resource(pdev, IORESOURCE_MEM, 0);
  80        if (!r) {
  81                dev_err(&pdev->dev, "Unable to get mem resource\n");
  82                res = -ENODEV;
  83                goto err;
  84        }
  85
  86        if (!devm_request_mem_region(&pdev->dev, r->start,
  87                                     resource_size(r), dev_name(&pdev->dev))) {
  88                dev_err(&pdev->dev, "Error while requesting mem region\n");
  89                res = -EBUSY;
  90                goto err;
  91        }
  92
  93        drvdata->base = devm_ioremap(&pdev->dev, r->start, resource_size(r));
  94        if (!drvdata->base) {
  95                dev_err(&pdev->dev, "Unable to map regs\n");
  96                res = -ENOMEM;
  97                goto err;
  98        }
  99
 100        id = of_match_device(hb_l2_err_of_match, &pdev->dev);
 101        dci->mod_name = pdev->dev.driver->name;
 102        dci->ctl_name = id ? id->compatible : "unknown";
 103        dci->dev_name = dev_name(&pdev->dev);
 104
 105        if (edac_device_add_device(dci))
 106                goto err;
 107
 108        drvdata->db_irq = platform_get_irq(pdev, 0);
 109        res = devm_request_irq(&pdev->dev, drvdata->db_irq,
 110                               highbank_l2_err_handler,
 111                               0, dev_name(&pdev->dev), dci);
 112        if (res < 0)
 113                goto err2;
 114
 115        drvdata->sb_irq = platform_get_irq(pdev, 1);
 116        res = devm_request_irq(&pdev->dev, drvdata->sb_irq,
 117                               highbank_l2_err_handler,
 118                               0, dev_name(&pdev->dev), dci);
 119        if (res < 0)
 120                goto err2;
 121
 122        devres_close_group(&pdev->dev, NULL);
 123        return 0;
 124err2:
 125        edac_device_del_device(&pdev->dev);
 126err:
 127        devres_release_group(&pdev->dev, NULL);
 128        edac_device_free_ctl_info(dci);
 129        return res;
 130}
 131
 132static int highbank_l2_err_remove(struct platform_device *pdev)
 133{
 134        struct edac_device_ctl_info *dci = platform_get_drvdata(pdev);
 135
 136        edac_device_del_device(&pdev->dev);
 137        edac_device_free_ctl_info(dci);
 138        return 0;
 139}
 140
 141static struct platform_driver highbank_l2_edac_driver = {
 142        .probe = highbank_l2_err_probe,
 143        .remove = highbank_l2_err_remove,
 144        .driver = {
 145                .name = "hb_l2_edac",
 146                .of_match_table = hb_l2_err_of_match,
 147        },
 148};
 149
 150module_platform_driver(highbank_l2_edac_driver);
 151
 152MODULE_LICENSE("GPL v2");
 153MODULE_AUTHOR("Calxeda, Inc.");
 154MODULE_DESCRIPTION("EDAC Driver for Calxeda Highbank L2 Cache");
 155