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/of.h> 11 #include <linux/of_device.h> 12 #include <linux/platform_device.h> 13 14 #include "edac_module.h" 15 16 #define SR_CLR_SB_ECC_INTR 0x0 17 #define SR_CLR_DB_ECC_INTR 0x4 18 19 struct hb_l2_drvdata { 20 void __iomem *base; 21 int sb_irq; 22 int db_irq; 23 }; 24 25 static irqreturn_t highbank_l2_err_handler(int irq, void *dev_id) 26 { 27 struct edac_device_ctl_info *dci = dev_id; 28 struct hb_l2_drvdata *drvdata = dci->pvt_info; 29 30 if (irq == drvdata->sb_irq) { 31 writel(1, drvdata->base + SR_CLR_SB_ECC_INTR); 32 edac_device_handle_ce(dci, 0, 0, dci->ctl_name); 33 } 34 if (irq == drvdata->db_irq) { 35 writel(1, drvdata->base + SR_CLR_DB_ECC_INTR); 36 edac_device_handle_ue(dci, 0, 0, dci->ctl_name); 37 } 38 39 return IRQ_HANDLED; 40 } 41 42 static const struct of_device_id hb_l2_err_of_match[] = { 43 { .compatible = "calxeda,hb-sregs-l2-ecc", }, 44 {}, 45 }; 46 MODULE_DEVICE_TABLE(of, hb_l2_err_of_match); 47 48 static int highbank_l2_err_probe(struct platform_device *pdev) 49 { 50 const struct of_device_id *id; 51 struct edac_device_ctl_info *dci; 52 struct hb_l2_drvdata *drvdata; 53 struct resource *r; 54 int res = 0; 55 56 dci = edac_device_alloc_ctl_info(sizeof(*drvdata), "cpu", 57 1, "L", 1, 2, 0); 58 if (!dci) 59 return -ENOMEM; 60 61 drvdata = dci->pvt_info; 62 dci->dev = &pdev->dev; 63 platform_set_drvdata(pdev, dci); 64 65 if (!devres_open_group(&pdev->dev, NULL, GFP_KERNEL)) 66 return -ENOMEM; 67 68 r = platform_get_resource(pdev, IORESOURCE_MEM, 0); 69 if (!r) { 70 dev_err(&pdev->dev, "Unable to get mem resource\n"); 71 res = -ENODEV; 72 goto err; 73 } 74 75 if (!devm_request_mem_region(&pdev->dev, r->start, 76 resource_size(r), dev_name(&pdev->dev))) { 77 dev_err(&pdev->dev, "Error while requesting mem region\n"); 78 res = -EBUSY; 79 goto err; 80 } 81 82 drvdata->base = devm_ioremap(&pdev->dev, r->start, resource_size(r)); 83 if (!drvdata->base) { 84 dev_err(&pdev->dev, "Unable to map regs\n"); 85 res = -ENOMEM; 86 goto err; 87 } 88 89 id = of_match_device(hb_l2_err_of_match, &pdev->dev); 90 dci->mod_name = pdev->dev.driver->name; 91 dci->ctl_name = id ? id->compatible : "unknown"; 92 dci->dev_name = dev_name(&pdev->dev); 93 94 if (edac_device_add_device(dci)) 95 goto err; 96 97 drvdata->db_irq = platform_get_irq(pdev, 0); 98 res = devm_request_irq(&pdev->dev, drvdata->db_irq, 99 highbank_l2_err_handler, 100 0, dev_name(&pdev->dev), dci); 101 if (res < 0) 102 goto err2; 103 104 drvdata->sb_irq = platform_get_irq(pdev, 1); 105 res = devm_request_irq(&pdev->dev, drvdata->sb_irq, 106 highbank_l2_err_handler, 107 0, dev_name(&pdev->dev), dci); 108 if (res < 0) 109 goto err2; 110 111 devres_close_group(&pdev->dev, NULL); 112 return 0; 113 err2: 114 edac_device_del_device(&pdev->dev); 115 err: 116 devres_release_group(&pdev->dev, NULL); 117 edac_device_free_ctl_info(dci); 118 return res; 119 } 120 121 static void highbank_l2_err_remove(struct platform_device *pdev) 122 { 123 struct edac_device_ctl_info *dci = platform_get_drvdata(pdev); 124 125 edac_device_del_device(&pdev->dev); 126 edac_device_free_ctl_info(dci); 127 } 128 129 static struct platform_driver highbank_l2_edac_driver = { 130 .probe = highbank_l2_err_probe, 131 .remove_new = 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