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_module.h"
  25
  26#define SR_CLR_SB_ECC_INTR      0x0
  27#define SR_CLR_DB_ECC_INTR      0x4
  28
  29struct hb_l2_drvdata {
  30        void __iomem *base;
  31        int sb_irq;
  32        int db_irq;
  33};
  34
  35static irqreturn_t highbank_l2_err_handler(int irq, void *dev_id)
  36{
  37        struct edac_device_ctl_info *dci = dev_id;
  38        struct hb_l2_drvdata *drvdata = dci->pvt_info;
  39
  40        if (irq == drvdata->sb_irq) {
  41                writel(1, drvdata->base + SR_CLR_SB_ECC_INTR);
  42                edac_device_handle_ce(dci, 0, 0, dci->ctl_name);
  43        }
  44        if (irq == drvdata->db_irq) {
  45                writel(1, drvdata->base + SR_CLR_DB_ECC_INTR);
  46                edac_device_handle_ue(dci, 0, 0, dci->ctl_name);
  47        }
  48
  49        return IRQ_HANDLED;
  50}
  51
  52static const struct of_device_id hb_l2_err_of_match[] = {
  53        { .compatible = "calxeda,hb-sregs-l2-ecc", },
  54        {},
  55};
  56MODULE_DEVICE_TABLE(of, hb_l2_err_of_match);
  57
  58static int highbank_l2_err_probe(struct platform_device *pdev)
  59{
  60        const struct of_device_id *id;
  61        struct edac_device_ctl_info *dci;
  62        struct hb_l2_drvdata *drvdata;
  63        struct resource *r;
  64        int res = 0;
  65
  66        dci = edac_device_alloc_ctl_info(sizeof(*drvdata), "cpu",
  67                1, "L", 1, 2, NULL, 0, 0);
  68        if (!dci)
  69                return -ENOMEM;
  70
  71        drvdata = dci->pvt_info;
  72        dci->dev = &pdev->dev;
  73        platform_set_drvdata(pdev, dci);
  74
  75        if (!devres_open_group(&pdev->dev, NULL, GFP_KERNEL))
  76                return -ENOMEM;
  77
  78        r = platform_get_resource(pdev, IORESOURCE_MEM, 0);
  79        if (!r) {
  80                dev_err(&pdev->dev, "Unable to get mem resource\n");
  81                res = -ENODEV;
  82                goto err;
  83        }
  84
  85        if (!devm_request_mem_region(&pdev->dev, r->start,
  86                                     resource_size(r), dev_name(&pdev->dev))) {
  87                dev_err(&pdev->dev, "Error while requesting mem region\n");
  88                res = -EBUSY;
  89                goto err;
  90        }
  91
  92        drvdata->base = devm_ioremap(&pdev->dev, r->start, resource_size(r));
  93        if (!drvdata->base) {
  94                dev_err(&pdev->dev, "Unable to map regs\n");
  95                res = -ENOMEM;
  96                goto err;
  97        }
  98
  99        id = of_match_device(hb_l2_err_of_match, &pdev->dev);
 100        dci->mod_name = pdev->dev.driver->name;
 101        dci->ctl_name = id ? id->compatible : "unknown";
 102        dci->dev_name = dev_name(&pdev->dev);
 103
 104        if (edac_device_add_device(dci))
 105                goto err;
 106
 107        drvdata->db_irq = platform_get_irq(pdev, 0);
 108        res = devm_request_irq(&pdev->dev, drvdata->db_irq,
 109                               highbank_l2_err_handler,
 110                               0, dev_name(&pdev->dev), dci);
 111        if (res < 0)
 112                goto err2;
 113
 114        drvdata->sb_irq = platform_get_irq(pdev, 1);
 115        res = devm_request_irq(&pdev->dev, drvdata->sb_irq,
 116                               highbank_l2_err_handler,
 117                               0, dev_name(&pdev->dev), dci);
 118        if (res < 0)
 119                goto err2;
 120
 121        devres_close_group(&pdev->dev, NULL);
 122        return 0;
 123err2:
 124        edac_device_del_device(&pdev->dev);
 125err:
 126        devres_release_group(&pdev->dev, NULL);
 127        edac_device_free_ctl_info(dci);
 128        return res;
 129}
 130
 131static int highbank_l2_err_remove(struct platform_device *pdev)
 132{
 133        struct edac_device_ctl_info *dci = platform_get_drvdata(pdev);
 134
 135        edac_device_del_device(&pdev->dev);
 136        edac_device_free_ctl_info(dci);
 137        return 0;
 138}
 139
 140static struct platform_driver highbank_l2_edac_driver = {
 141        .probe = highbank_l2_err_probe,
 142        .remove = highbank_l2_err_remove,
 143        .driver = {
 144                .name = "hb_l2_edac",
 145                .of_match_table = hb_l2_err_of_match,
 146        },
 147};
 148
 149module_platform_driver(highbank_l2_edac_driver);
 150
 151MODULE_LICENSE("GPL v2");
 152MODULE_AUTHOR("Calxeda, Inc.");
 153MODULE_DESCRIPTION("EDAC Driver for Calxeda Highbank L2 Cache");
 154