drivers/edac/highbank_l2_edac.c

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