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/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
  18 struct hb_l2_drvdata {
  19         void __iomem *base;
  20         int sb_irq;
  21         int db_irq;
  22 };
  23
  24 static 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
  41 static const struct of_device_id hb_l2_err_of_match[] = {
  42         { .compatible = "calxeda,hb-sregs-l2-ecc", },
  43         {},
  44 };
  45 MODULE_DEVICE_TABLE(of, hb_l2_err_of_match);
  46
  47 static 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;
 112 err2:
 113         edac_device_del_device(&pdev->dev);
 114 err:
 115         devres_release_group(&pdev->dev, NULL);
 116         edac_device_free_ctl_info(dci);
 117         return res;
 118 }
 119
 120 static 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
 129 static 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
 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");