LXR linux/drivers/edac/highbank_l2

   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 int highbank_l2_err_probe(struct platform_device *pdev)
  54{
  55        struct edac_device_ctl_info *dci;
  56        struct hb_l2_drvdata *drvdata;
  57        struct resource *r;
  58        int res = 0;
  59
  60        dci = edac_device_alloc_ctl_info(sizeof(*drvdata), "cpu",
  61                1, "L", 1, 2, NULL, 0, 0);
  62        if (!dci)
  63                return -ENOMEM;
  64
  65        drvdata = dci->pvt_info;
  66        dci->dev = &pdev->dev;
  67        platform_set_drvdata(pdev, dci);
  68
  69        if (!devres_open_group(&pdev->dev, NULL, GFP_KERNEL))
  70                return -ENOMEM;
  71
  72        r = platform_get_resource(pdev, IORESOURCE_MEM, 0);
  73        if (!r) {
  74                dev_err(&pdev->dev, "Unable to get mem resource\n");
  75                res = -ENODEV;
  76                goto err;
  77        }
  78
  79        if (!devm_request_mem_region(&pdev->dev, r->start,
  80                                     resource_size(r), dev_name(&pdev->dev))) {
  81                dev_err(&pdev->dev, "Error while requesting mem region\n");
  82                res = -EBUSY;
  83                goto err;
  84        }
  85
  86        drvdata->base = devm_ioremap(&pdev->dev, r->start, resource_size(r));
  87        if (!drvdata->base) {
  88                dev_err(&pdev->dev, "Unable to map regs\n");
  89                res = -ENOMEM;
  90                goto err;
  91        }
  92
  93        drvdata->db_irq = platform_get_irq(pdev, 0);
  94        res = devm_request_irq(&pdev->dev, drvdata->db_irq,
  95                               highbank_l2_err_handler,
  96                               0, dev_name(&pdev->dev), dci);
  97        if (res < 0)
  98                goto err;
  99
 100        drvdata->sb_irq = platform_get_irq(pdev, 1);
 101        res = devm_request_irq(&pdev->dev, drvdata->sb_irq,
 102                               highbank_l2_err_handler,
 103                               0, dev_name(&pdev->dev), dci);
 104        if (res < 0)
 105                goto err;
 106
 107        dci->mod_name = dev_name(&pdev->dev);
 108        dci->dev_name = dev_name(&pdev->dev);
 109
 110        if (edac_device_add_device(dci))
 111                goto err;
 112
 113        devres_close_group(&pdev->dev, NULL);
 114        return 0;
 115err:
 116        devres_release_group(&pdev->dev, NULL);
 117        edac_device_free_ctl_info(dci);
 118        return res;
 119}
 120
 121static int highbank_l2_err_remove(struct platform_device *pdev)
 122{
 123        struct edac_device_ctl_info *dci = platform_get_drvdata(pdev);
 124
 125        edac_device_del_device(&pdev->dev);
 126        edac_device_free_ctl_info(dci);
 127        return 0;
 128}
 129
 130static const struct of_device_id hb_l2_err_of_match[] = {
 131        { .compatible = "calxeda,hb-sregs-l2-ecc", },
 132        {},
 133};
 134MODULE_DEVICE_TABLE(of, hb_l2_err_of_match);
 135
 136static struct platform_driver highbank_l2_edac_driver = {
 137        .probe = highbank_l2_err_probe,
 138        .remove = highbank_l2_err_remove,
 139        .driver = {
 140                .name = "hb_l2_edac",
 141                .of_match_table = hb_l2_err_of_match,
 142        },
 143};
 144
 145module_platform_driver(highbank_l2_edac_driver);
 146
 147MODULE_LICENSE("GPL v2");
 148MODULE_AUTHOR("Calxeda, Inc.");
 149MODULE_DESCRIPTION("EDAC Driver for Calxeda Highbank L2 Cache");
 150