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_module.h"
  25
  26 #define SR_CLR_SB_ECC_INTR      0x0
  27 #define SR_CLR_DB_ECC_INTR      0x4
  28
  29 struct hb_l2_drvdata {
  30         void __iomem *base;
  31         int sb_irq;
  32         int db_irq;
  33 };
  34
  35 static 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
  52 static const struct of_device_id hb_l2_err_of_match[] = {
  53         { .compatible = "calxeda,hb-sregs-l2-ecc", },
  54         {},
  55 };
  56 MODULE_DEVICE_TABLE(of, hb_l2_err_of_match);
  57
  58 static 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;
 123 err2:
 124         edac_device_del_device(&pdev->dev);
 125 err:
 126         devres_release_group(&pdev->dev, NULL);
 127         edac_device_free_ctl_info(dci);
 128         return res;
 129 }
 130
 131 static 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
 140 static 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
 149 module_platform_driver(highbank_l2_edac_driver);
 150
 151 MODULE_LICENSE("GPL v2");
 152 MODULE_AUTHOR("Calxeda, Inc.");
 153 MODULE_DESCRIPTION("EDAC Driver for Calxeda Highbank L2 Cache");