drivers/edac/highbank_l2_edac.c

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