xref: /openbmc/linux/drivers/edac/sifive_edac.c (revision ca120a79)
1 // SPDX-License-Identifier: GPL-2.0
2 /*
3  * SiFive Platform EDAC Driver
4  *
5  * Copyright (C) 2018-2022 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 <soc/sifive/sifive_ccache.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_CCACHE_ERR_TYPE_UE)
36 		edac_device_handle_ue(p->dci, 0, 0, msg);
37 	else if (event == SIFIVE_CCACHE_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 (!p->dci)
58 		return -ENOMEM;
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_ccache_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_ccache_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