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
30struct hb_l2_drvdata {
31	void __iomem *base;
32	int sb_irq;
33	int db_irq;
34};
35
36static 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
53static const struct of_device_id hb_l2_err_of_match[] = {
54	{ .compatible = "calxeda,hb-sregs-l2-ecc", },
55	{},
56};
57MODULE_DEVICE_TABLE(of, hb_l2_err_of_match);
58
59static int highbank_l2_err_probe(struct platform_device *pdev)
60{
61	const struct of_device_id *id;
62	struct edac_device_ctl_info *dci;
63	struct hb_l2_drvdata *drvdata;
64	struct resource *r;
65	int res = 0;
66
67	dci = edac_device_alloc_ctl_info(sizeof(*drvdata), "cpu",
68		1, "L", 1, 2, NULL, 0, 0);
69	if (!dci)
70		return -ENOMEM;
71
72	drvdata = dci->pvt_info;
73	dci->dev = &pdev->dev;
74	platform_set_drvdata(pdev, dci);
75
76	if (!devres_open_group(&pdev->dev, NULL, GFP_KERNEL))
77		return -ENOMEM;
78
79	r = platform_get_resource(pdev, IORESOURCE_MEM, 0);
80	if (!r) {
81		dev_err(&pdev->dev, "Unable to get mem resource\n");
82		res = -ENODEV;
83		goto err;
84	}
85
86	if (!devm_request_mem_region(&pdev->dev, r->start,
87				     resource_size(r), dev_name(&pdev->dev))) {
88		dev_err(&pdev->dev, "Error while requesting mem region\n");
89		res = -EBUSY;
90		goto err;
91	}
92
93	drvdata->base = devm_ioremap(&pdev->dev, r->start, resource_size(r));
94	if (!drvdata->base) {
95		dev_err(&pdev->dev, "Unable to map regs\n");
96		res = -ENOMEM;
97		goto err;
98	}
99
100	id = of_match_device(hb_l2_err_of_match, &pdev->dev);
101	dci->mod_name = pdev->dev.driver->name;
102	dci->ctl_name = id ? id->compatible : "unknown";
103	dci->dev_name = dev_name(&pdev->dev);
104
105	if (edac_device_add_device(dci))
106		goto err;
107
108	drvdata->db_irq = platform_get_irq(pdev, 0);
109	res = devm_request_irq(&pdev->dev, drvdata->db_irq,
110			       highbank_l2_err_handler,
111			       0, dev_name(&pdev->dev), dci);
112	if (res < 0)
113		goto err2;
114
115	drvdata->sb_irq = platform_get_irq(pdev, 1);
116	res = devm_request_irq(&pdev->dev, drvdata->sb_irq,
117			       highbank_l2_err_handler,
118			       0, dev_name(&pdev->dev), dci);
119	if (res < 0)
120		goto err2;
121
122	devres_close_group(&pdev->dev, NULL);
123	return 0;
124err2:
125	edac_device_del_device(&pdev->dev);
126err:
127	devres_release_group(&pdev->dev, NULL);
128	edac_device_free_ctl_info(dci);
129	return res;
130}
131
132static int highbank_l2_err_remove(struct platform_device *pdev)
133{
134	struct edac_device_ctl_info *dci = platform_get_drvdata(pdev);
135
136	edac_device_del_device(&pdev->dev);
137	edac_device_free_ctl_info(dci);
138	return 0;
139}
140
141static struct platform_driver highbank_l2_edac_driver = {
142	.probe = highbank_l2_err_probe,
143	.remove = highbank_l2_err_remove,
144	.driver = {
145		.name = "hb_l2_edac",
146		.of_match_table = hb_l2_err_of_match,
147	},
148};
149
150module_platform_driver(highbank_l2_edac_driver);
151
152MODULE_LICENSE("GPL v2");
153MODULE_AUTHOR("Calxeda, Inc.");
154MODULE_DESCRIPTION("EDAC Driver for Calxeda Highbank L2 Cache");
155