drivers/edac/highbank_l2_edac.c

0001 // SPDX-License-Identifier: GPL-2.0-only
0002 /*
0003  * Copyright 2011-2012 Calxeda, Inc.
0004  */
0005 #include <linux/types.h>
0006 #include <linux/kernel.h>
0007 #include <linux/ctype.h>
0008 #include <linux/edac.h>
0009 #include <linux/interrupt.h>
0010 #include <linux/platform_device.h>
0011 #include <linux/of_platform.h>
0012
0013 #include "edac_module.h"
0014
0015 #define SR_CLR_SB_ECC_INTR  0x0
0016 #define SR_CLR_DB_ECC_INTR  0x4
0017
0018 struct hb_l2_drvdata {
0019     void __iomem *base;
0020     int sb_irq;
0021     int db_irq;
0022 };
0023
0024 static irqreturn_t highbank_l2_err_handler(int irq, void *dev_id)
0025 {
0026     struct edac_device_ctl_info *dci = dev_id;
0027     struct hb_l2_drvdata *drvdata = dci->pvt_info;
0028
0029     if (irq == drvdata->sb_irq) {
0030         writel(1, drvdata->base + SR_CLR_SB_ECC_INTR);
0031         edac_device_handle_ce(dci, 0, 0, dci->ctl_name);
0032     }
0033     if (irq == drvdata->db_irq) {
0034         writel(1, drvdata->base + SR_CLR_DB_ECC_INTR);
0035         edac_device_handle_ue(dci, 0, 0, dci->ctl_name);
0036     }
0037
0038     return IRQ_HANDLED;
0039 }
0040
0041 static const struct of_device_id hb_l2_err_of_match[] = {
0042     { .compatible = "calxeda,hb-sregs-l2-ecc", },
0043     {},
0044 };
0045 MODULE_DEVICE_TABLE(of, hb_l2_err_of_match);
0046
0047 static int highbank_l2_err_probe(struct platform_device *pdev)
0048 {
0049     const struct of_device_id *id;
0050     struct edac_device_ctl_info *dci;
0051     struct hb_l2_drvdata *drvdata;
0052     struct resource *r;
0053     int res = 0;
0054
0055     dci = edac_device_alloc_ctl_info(sizeof(*drvdata), "cpu",
0056         1, "L", 1, 2, NULL, 0, 0);
0057     if (!dci)
0058         return -ENOMEM;
0059
0060     drvdata = dci->pvt_info;
0061     dci->dev = &pdev->dev;
0062     platform_set_drvdata(pdev, dci);
0063
0064     if (!devres_open_group(&pdev->dev, NULL, GFP_KERNEL))
0065         return -ENOMEM;
0066
0067     r = platform_get_resource(pdev, IORESOURCE_MEM, 0);
0068     if (!r) {
0069         dev_err(&pdev->dev, "Unable to get mem resource\n");
0070         res = -ENODEV;
0071         goto err;
0072     }
0073
0074     if (!devm_request_mem_region(&pdev->dev, r->start,
0075                      resource_size(r), dev_name(&pdev->dev))) {
0076         dev_err(&pdev->dev, "Error while requesting mem region\n");
0077         res = -EBUSY;
0078         goto err;
0079     }
0080
0081     drvdata->base = devm_ioremap(&pdev->dev, r->start, resource_size(r));
0082     if (!drvdata->base) {
0083         dev_err(&pdev->dev, "Unable to map regs\n");
0084         res = -ENOMEM;
0085         goto err;
0086     }
0087
0088     id = of_match_device(hb_l2_err_of_match, &pdev->dev);
0089     dci->mod_name = pdev->dev.driver->name;
0090     dci->ctl_name = id ? id->compatible : "unknown";
0091     dci->dev_name = dev_name(&pdev->dev);
0092
0093     if (edac_device_add_device(dci))
0094         goto err;
0095
0096     drvdata->db_irq = platform_get_irq(pdev, 0);
0097     res = devm_request_irq(&pdev->dev, drvdata->db_irq,
0098                    highbank_l2_err_handler,
0099                    0, dev_name(&pdev->dev), dci);
0100     if (res < 0)
0101         goto err2;
0102
0103     drvdata->sb_irq = platform_get_irq(pdev, 1);
0104     res = devm_request_irq(&pdev->dev, drvdata->sb_irq,
0105                    highbank_l2_err_handler,
0106                    0, dev_name(&pdev->dev), dci);
0107     if (res < 0)
0108         goto err2;
0109
0110     devres_close_group(&pdev->dev, NULL);
0111     return 0;
0112 err2:
0113     edac_device_del_device(&pdev->dev);
0114 err:
0115     devres_release_group(&pdev->dev, NULL);
0116     edac_device_free_ctl_info(dci);
0117     return res;
0118 }
0119
0120 static int highbank_l2_err_remove(struct platform_device *pdev)
0121 {
0122     struct edac_device_ctl_info *dci = platform_get_drvdata(pdev);
0123
0124     edac_device_del_device(&pdev->dev);
0125     edac_device_free_ctl_info(dci);
0126     return 0;
0127 }
0128
0129 static struct platform_driver highbank_l2_edac_driver = {
0130     .probe = highbank_l2_err_probe,
0131     .remove = highbank_l2_err_remove,
0132     .driver = {
0133         .name = "hb_l2_edac",
0134         .of_match_table = hb_l2_err_of_match,
0135     },
0136 };
0137
0138 module_platform_driver(highbank_l2_edac_driver);
0139
0140 MODULE_LICENSE("GPL v2");
0141 MODULE_AUTHOR("Calxeda, Inc.");
0142 MODULE_DESCRIPTION("EDAC Driver for Calxeda Highbank L2 Cache");