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"); 143