linux/drivers/edac/highbank_l2_edac.c
<<
>>
Prefs
   1// SPDX-License-Identifier: GPL-2.0-only
   2/*
   3 * Copyright 2011-2012 Calxeda, Inc.
   4 */
   5#include <linux/types.h>
   6#include <linux/kernel.h>
   7#include <linux/ctype.h>
   8#include <linux/edac.h>
   9#include <linux/interrupt.h>
  10#include <linux/platform_device.h>
  11#include <linux/of_platform.h>
  12
  13#include "edac_module.h"
  14
  15#define SR_CLR_SB_ECC_INTR      0x0
  16#define SR_CLR_DB_ECC_INTR      0x4
  17
  18struct hb_l2_drvdata {
  19        void __iomem *base;
  20        int sb_irq;
  21        int db_irq;
  22};
  23
  24static irqreturn_t highbank_l2_err_handler(int irq, void *dev_id)
  25{
  26        struct edac_device_ctl_info *dci = dev_id;
  27        struct hb_l2_drvdata *drvdata = dci->pvt_info;
  28
  29        if (irq == drvdata->sb_irq) {
  30                writel(1, drvdata->base + SR_CLR_SB_ECC_INTR);
  31                edac_device_handle_ce(dci, 0, 0, dci->ctl_name);
  32        }
  33        if (irq == drvdata->db_irq) {
  34                writel(1, drvdata->base + SR_CLR_DB_ECC_INTR);
  35                edac_device_handle_ue(dci, 0, 0, dci->ctl_name);
  36        }
  37
  38        return IRQ_HANDLED;
  39}
  40
  41static const struct of_device_id hb_l2_err_of_match[] = {
  42        { .compatible = "calxeda,hb-sregs-l2-ecc", },
  43        {},
  44};
  45MODULE_DEVICE_TABLE(of, hb_l2_err_of_match);
  46
  47static int highbank_l2_err_probe(struct platform_device *pdev)
  48{
  49        const struct of_device_id *id;
  50        struct edac_device_ctl_info *dci;
  51        struct hb_l2_drvdata *drvdata;
  52        struct resource *r;
  53        int res = 0;
  54
  55        dci = edac_device_alloc_ctl_info(sizeof(*drvdata), "cpu",
  56                1, "L", 1, 2, NULL, 0, 0);
  57        if (!dci)
  58                return -ENOMEM;
  59
  60        drvdata = dci->pvt_info;
  61        dci->dev = &pdev->dev;
  62        platform_set_drvdata(pdev, dci);
  63
  64        if (!devres_open_group(&pdev->dev, NULL, GFP_KERNEL))
  65                return -ENOMEM;
  66
  67        r = platform_get_resource(pdev, IORESOURCE_MEM, 0);
  68        if (!r) {
  69                dev_err(&pdev->dev, "Unable to get mem resource\n");
  70                res = -ENODEV;
  71                goto err;
  72        }
  73
  74        if (!devm_request_mem_region(&pdev->dev, r->start,
  75                                     resource_size(r), dev_name(&pdev->dev))) {
  76                dev_err(&pdev->dev, "Error while requesting mem region\n");
  77                res = -EBUSY;
  78                goto err;
  79        }
  80
  81        drvdata->base = devm_ioremap(&pdev->dev, r->start, resource_size(r));
  82        if (!drvdata->base) {
  83                dev_err(&pdev->dev, "Unable to map regs\n");
  84                res = -ENOMEM;
  85                goto err;
  86        }
  87
  88        id = of_match_device(hb_l2_err_of_match, &pdev->dev);
  89        dci->mod_name = pdev->dev.driver->name;
  90        dci->ctl_name = id ? id->compatible : "unknown";
  91        dci->dev_name = dev_name(&pdev->dev);
  92
  93        if (edac_device_add_device(dci))
  94                goto err;
  95
  96        drvdata->db_irq = platform_get_irq(pdev, 0);
  97        res = devm_request_irq(&pdev->dev, drvdata->db_irq,
  98                               highbank_l2_err_handler,
  99                               0, dev_name(&pdev->dev), dci);
 100        if (res < 0)
 101                goto err2;
 102
 103        drvdata->sb_irq = platform_get_irq(pdev, 1);
 104        res = devm_request_irq(&pdev->dev, drvdata->sb_irq,
 105                               highbank_l2_err_handler,
 106                               0, dev_name(&pdev->dev), dci);
 107        if (res < 0)
 108                goto err2;
 109
 110        devres_close_group(&pdev->dev, NULL);
 111        return 0;
 112err2:
 113        edac_device_del_device(&pdev->dev);
 114err:
 115        devres_release_group(&pdev->dev, NULL);
 116        edac_device_free_ctl_info(dci);
 117        return res;
 118}
 119
 120static int highbank_l2_err_remove(struct platform_device *pdev)
 121{
 122        struct edac_device_ctl_info *dci = platform_get_drvdata(pdev);
 123
 124        edac_device_del_device(&pdev->dev);
 125        edac_device_free_ctl_info(dci);
 126        return 0;
 127}
 128
 129static struct platform_driver highbank_l2_edac_driver = {
 130        .probe = highbank_l2_err_probe,
 131        .remove = highbank_l2_err_remove,
 132        .driver = {
 133                .name = "hb_l2_edac",
 134                .of_match_table = hb_l2_err_of_match,
 135        },
 136};
 137
 138module_platform_driver(highbank_l2_edac_driver);
 139
 140MODULE_LICENSE("GPL v2");
 141MODULE_AUTHOR("Calxeda, Inc.");
 142MODULE_DESCRIPTION("EDAC Driver for Calxeda Highbank L2 Cache");
 143