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