aboutsummaryrefslogtreecommitdiffstats
path: root/drivers/edac/highbank_l2_edac.c
blob: cd9a2bb7c548799d73102ea826be271f487454c7 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
/*
 * Copyright 2011-2012 Calxeda, Inc.
 *
 * This program is free software; you can redistribute it and/or modify it
 * under the terms and conditions of the GNU General Public License,
 * version 2, as published by the Free Software Foundation.
 *
 * This program is distributed in the hope it will be useful, but WITHOUT
 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
 * more details.
 *
 * You should have received a copy of the GNU General Public License along with
 * this program.  If not, see <http://www.gnu.org/licenses/>.
 */
#include <linux/types.h>
#include <linux/kernel.h>
#include <linux/ctype.h>
#include <linux/edac.h>
#include <linux/interrupt.h>
#include <linux/platform_device.h>
#include <linux/of_platform.h>

#include "edac_module.h"

#define SR_CLR_SB_ECC_INTR	0x0
#define SR_CLR_DB_ECC_INTR	0x4

struct hb_l2_drvdata {
	void __iomem *base;
	int sb_irq;
	int db_irq;
};

static irqreturn_t highbank_l2_err_handler(int irq, void *dev_id)
{
	struct edac_device_ctl_info *dci = dev_id;
	struct hb_l2_drvdata *drvdata = dci->pvt_info;

	if (irq == drvdata->sb_irq) {
		writel(1, drvdata->base + SR_CLR_SB_ECC_INTR);
		edac_device_handle_ce(dci, 0, 0, dci->ctl_name);
	}
	if (irq == drvdata->db_irq) {
		writel(1, drvdata->base + SR_CLR_DB_ECC_INTR);
		edac_device_handle_ue(dci, 0, 0, dci->ctl_name);
	}

	return IRQ_HANDLED;
}

static const struct of_device_id hb_l2_err_of_match[] = {
	{ .compatible = "calxeda,hb-sregs-l2-ecc", },
	{},
};
MODULE_DEVICE_TABLE(of, hb_l2_err_of_match);

static int highbank_l2_err_probe(struct platform_device *pdev)
{
	const struct of_device_id *id;
	struct edac_device_ctl_info *dci;
	struct hb_l2_drvdata *drvdata;
	struct resource *r;
	int res = 0;

	dci = edac_device_alloc_ctl_info(sizeof(*drvdata), "cpu",
		1, "L", 1, 2, NULL, 0, 0);
	if (!dci)
		return -ENOMEM;

	drvdata = dci->pvt_info;
	dci->dev = &pdev->dev;
	platform_set_drvdata(pdev, dci);

	if (!devres_open_group(&pdev->dev, NULL, GFP_KERNEL))
		return -ENOMEM;

	r = platform_get_resource(pdev, IORESOURCE_MEM, 0);
	if (!r) {
		dev_err(&pdev->dev, "Unable to get mem resource\n");
		res = -ENODEV;
		goto err;
	}

	if (!devm_request_mem_region(&pdev->dev, r->start,
				     resource_size(r), dev_name(&pdev->dev))) {
		dev_err(&pdev->dev, "Error while requesting mem region\n");
		res = -EBUSY;
		goto err;
	}

	drvdata->base = devm_ioremap(&pdev->dev, r->start, resource_size(r));
	if (!drvdata->base) {
		dev_err(&pdev->dev, "Unable to map regs\n");
		res = -ENOMEM;
		goto err;
	}

	id = of_match_device(hb_l2_err_of_match, &pdev->dev);
	dci->mod_name = pdev->dev.driver->name;
	dci->ctl_name = id ? id->compatible : "unknown";
	dci->dev_name = dev_name(&pdev->dev);

	if (edac_device_add_device(dci))
		goto err;

	drvdata->db_irq = platform_get_irq(pdev, 0);
	res = devm_request_irq(&pdev->dev, drvdata->db_irq,
			       highbank_l2_err_handler,
			       0, dev_name(&pdev->dev), dci);
	if (res < 0)
		goto err2;

	drvdata->sb_irq = platform_get_irq(pdev, 1);
	res = devm_request_irq(&pdev->dev, drvdata->sb_irq,
			       highbank_l2_err_handler,
			       0, dev_name(&pdev->dev), dci);
	if (res < 0)
		goto err2;

	devres_close_group(&pdev->dev, NULL);
	return 0;
err2:
	edac_device_del_device(&pdev->dev);
err:
	devres_release_group(&pdev->dev, NULL);
	edac_device_free_ctl_info(dci);
	return res;
}

static int highbank_l2_err_remove(struct platform_device *pdev)
{
	struct edac_device_ctl_info *dci = platform_get_drvdata(pdev);

	edac_device_del_device(&pdev->dev);
	edac_device_free_ctl_info(dci);
	return 0;
}

static struct platform_driver highbank_l2_edac_driver = {
	.probe = highbank_l2_err_probe,
	.remove = highbank_l2_err_remove,
	.driver = {
		.name = "hb_l2_edac",
		.of_match_table = hb_l2_err_of_match,
	},
};

module_platform_driver(highbank_l2_edac_driver);

MODULE_LICENSE("GPL v2");
MODULE_AUTHOR("Calxeda, Inc.");
MODULE_DESCRIPTION("EDAC Driver for Calxeda Highbank L2 Cache");

Privacy Policy