1 // SPDX-License-Identifier: GPL-2.0
2 /*
3 * SiFive Platform EDAC Driver
4 *
5 * Copyright (C) 2018-2019 SiFive, Inc.
6 *
7 * This driver is partially based on octeon_edac-pc.c
8 *
9 */
10 #include <linux/edac.h>
11 #include <linux/platform_device.h>
12 #include "edac_module.h"
13 #include <asm/sifive_l2_cache.h>
14
15 #define DRVNAME "sifive_edac"
16
17 struct sifive_edac_priv {
18 struct notifier_block notifier;
19 struct edac_device_ctl_info *dci;
20 };
21
22 /**
23 * EDAC error callback
24 *
25 * @event: non-zero if unrecoverable.
26 */
27 static
ecc_err_event(struct notifier_block * this,unsigned long event,void * ptr)28 int ecc_err_event(struct notifier_block *this, unsigned long event, void *ptr)
29 {
30 const char *msg = (char *)ptr;
31 struct sifive_edac_priv *p;
32
33 p = container_of(this, struct sifive_edac_priv, notifier);
34
35 if (event == SIFIVE_L2_ERR_TYPE_UE)
36 edac_device_handle_ue(p->dci, 0, 0, msg);
37 else if (event == SIFIVE_L2_ERR_TYPE_CE)
38 edac_device_handle_ce(p->dci, 0, 0, msg);
39
40 return NOTIFY_OK;
41 }
42
ecc_register(struct platform_device * pdev)43 static int ecc_register(struct platform_device *pdev)
44 {
45 struct sifive_edac_priv *p;
46
47 p = devm_kzalloc(&pdev->dev, sizeof(*p), GFP_KERNEL);
48 if (!p)
49 return -ENOMEM;
50
51 p->notifier.notifier_call = ecc_err_event;
52 platform_set_drvdata(pdev, p);
53
54 p->dci = edac_device_alloc_ctl_info(0, "sifive_ecc", 1, "sifive_ecc",
55 1, 1, NULL, 0,
56 edac_device_alloc_index());
57 if (IS_ERR(p->dci))
58 return PTR_ERR(p->dci);
59
60 p->dci->dev = &pdev->dev;
61 p->dci->mod_name = "Sifive ECC Manager";
62 p->dci->ctl_name = dev_name(&pdev->dev);
63 p->dci->dev_name = dev_name(&pdev->dev);
64
65 if (edac_device_add_device(p->dci)) {
66 dev_err(p->dci->dev, "failed to register with EDAC core\n");
67 goto err;
68 }
69
70 register_sifive_l2_error_notifier(&p->notifier);
71
72 return 0;
73
74 err:
75 edac_device_free_ctl_info(p->dci);
76
77 return -ENXIO;
78 }
79
ecc_unregister(struct platform_device * pdev)80 static int ecc_unregister(struct platform_device *pdev)
81 {
82 struct sifive_edac_priv *p = platform_get_drvdata(pdev);
83
84 unregister_sifive_l2_error_notifier(&p->notifier);
85 edac_device_del_device(&pdev->dev);
86 edac_device_free_ctl_info(p->dci);
87
88 return 0;
89 }
90
91 static struct platform_device *sifive_pdev;
92
sifive_edac_init(void)93 static int __init sifive_edac_init(void)
94 {
95 int ret;
96
97 sifive_pdev = platform_device_register_simple(DRVNAME, 0, NULL, 0);
98 if (IS_ERR(sifive_pdev))
99 return PTR_ERR(sifive_pdev);
100
101 ret = ecc_register(sifive_pdev);
102 if (ret)
103 platform_device_unregister(sifive_pdev);
104
105 return ret;
106 }
107
sifive_edac_exit(void)108 static void __exit sifive_edac_exit(void)
109 {
110 ecc_unregister(sifive_pdev);
111 platform_device_unregister(sifive_pdev);
112 }
113
114 module_init(sifive_edac_init);
115 module_exit(sifive_edac_exit);
116
117 MODULE_AUTHOR("SiFive Inc.");
118 MODULE_DESCRIPTION("SiFive platform EDAC driver");
119 MODULE_LICENSE("GPL v2");
120