1// SPDX-License-Identifier: GPL-2.0-only
2/*
3 * Copyright 2011-2012 Calxeda, Inc.
4 */
5#include <linux/types.h>
6#include <linux/kernel.h>
7#include <linux/ctype.h>
8#include <linux/edac.h>
9#include <linux/interrupt.h>
10#include <linux/platform_device.h>
11#include <linux/of_platform.h>
12
13#include "edac_module.h"
14
15#define SR_CLR_SB_ECC_INTR	0x0
16#define SR_CLR_DB_ECC_INTR	0x4
17
18struct hb_l2_drvdata {
19	void __iomem *base;
20	int sb_irq;
21	int db_irq;
22};
23
24static irqreturn_t highbank_l2_err_handler(int irq, void *dev_id)
25{
26	struct edac_device_ctl_info *dci = dev_id;
27	struct hb_l2_drvdata *drvdata = dci->pvt_info;
28
29	if (irq == drvdata->sb_irq) {
30		writel(1, drvdata->base + SR_CLR_SB_ECC_INTR);
31		edac_device_handle_ce(dci, 0, 0, dci->ctl_name);
32	}
33	if (irq == drvdata->db_irq) {
34		writel(1, drvdata->base + SR_CLR_DB_ECC_INTR);
35		edac_device_handle_ue(dci, 0, 0, dci->ctl_name);
36	}
37
38	return IRQ_HANDLED;
39}
40
41static const struct of_device_id hb_l2_err_of_match[] = {
42	{ .compatible = "calxeda,hb-sregs-l2-ecc", },
43	{},
44};
45MODULE_DEVICE_TABLE(of, hb_l2_err_of_match);
46
47static int highbank_l2_err_probe(struct platform_device *pdev)
48{
49	const struct of_device_id *id;
50	struct edac_device_ctl_info *dci;
51	struct hb_l2_drvdata *drvdata;
52	struct resource *r;
53	int res = 0;
54
55	dci = edac_device_alloc_ctl_info(sizeof(*drvdata), "cpu",
56		1, "L", 1, 2, NULL, 0, 0);
57	if (!dci)
58		return -ENOMEM;
59
60	drvdata = dci->pvt_info;
61	dci->dev = &pdev->dev;
62	platform_set_drvdata(pdev, dci);
63
64	if (!devres_open_group(&pdev->dev, NULL, GFP_KERNEL))
65		return -ENOMEM;
66
67	r = platform_get_resource(pdev, IORESOURCE_MEM, 0);
68	if (!r) {
69		dev_err(&pdev->dev, "Unable to get mem resource\n");
70		res = -ENODEV;
71		goto err;
72	}
73
74	if (!devm_request_mem_region(&pdev->dev, r->start,
75				     resource_size(r), dev_name(&pdev->dev))) {
76		dev_err(&pdev->dev, "Error while requesting mem region\n");
77		res = -EBUSY;
78		goto err;
79	}
80
81	drvdata->base = devm_ioremap(&pdev->dev, r->start, resource_size(r));
82	if (!drvdata->base) {
83		dev_err(&pdev->dev, "Unable to map regs\n");
84		res = -ENOMEM;
85		goto err;
86	}
87
88	id = of_match_device(hb_l2_err_of_match, &pdev->dev);
89	dci->mod_name = pdev->dev.driver->name;
90	dci->ctl_name = id ? id->compatible : "unknown";
91	dci->dev_name = dev_name(&pdev->dev);
92
93	if (edac_device_add_device(dci))
94		goto err;
95
96	drvdata->db_irq = platform_get_irq(pdev, 0);
97	res = devm_request_irq(&pdev->dev, drvdata->db_irq,
98			       highbank_l2_err_handler,
99			       0, dev_name(&pdev->dev), dci);
100	if (res < 0)
101		goto err2;
102
103	drvdata->sb_irq = platform_get_irq(pdev, 1);
104	res = devm_request_irq(&pdev->dev, drvdata->sb_irq,
105			       highbank_l2_err_handler,
106			       0, dev_name(&pdev->dev), dci);
107	if (res < 0)
108		goto err2;
109
110	devres_close_group(&pdev->dev, NULL);
111	return 0;
112err2:
113	edac_device_del_device(&pdev->dev);
114err:
115	devres_release_group(&pdev->dev, NULL);
116	edac_device_free_ctl_info(dci);
117	return res;
118}
119
120static int highbank_l2_err_remove(struct platform_device *pdev)
121{
122	struct edac_device_ctl_info *dci = platform_get_drvdata(pdev);
123
124	edac_device_del_device(&pdev->dev);
125	edac_device_free_ctl_info(dci);
126	return 0;
127}
128
129static struct platform_driver highbank_l2_edac_driver = {
130	.probe = highbank_l2_err_probe,
131	.remove = highbank_l2_err_remove,
132	.driver = {
133		.name = "hb_l2_edac",
134		.of_match_table = hb_l2_err_of_match,
135	},
136};
137
138module_platform_driver(highbank_l2_edac_driver);
139
140MODULE_LICENSE("GPL v2");
141MODULE_AUTHOR("Calxeda, Inc.");
142MODULE_DESCRIPTION("EDAC Driver for Calxeda Highbank L2 Cache");
143