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/of.h>
11#include <linux/of_device.h>
12#include <linux/platform_device.h>
13
14#include "edac_module.h"
15
16#define SR_CLR_SB_ECC_INTR	0x0
17#define SR_CLR_DB_ECC_INTR	0x4
18
19struct hb_l2_drvdata {
20	void __iomem *base;
21	int sb_irq;
22	int db_irq;
23};
24
25static irqreturn_t highbank_l2_err_handler(int irq, void *dev_id)
26{
27	struct edac_device_ctl_info *dci = dev_id;
28	struct hb_l2_drvdata *drvdata = dci->pvt_info;
29
30	if (irq == drvdata->sb_irq) {
31		writel(1, drvdata->base + SR_CLR_SB_ECC_INTR);
32		edac_device_handle_ce(dci, 0, 0, dci->ctl_name);
33	}
34	if (irq == drvdata->db_irq) {
35		writel(1, drvdata->base + SR_CLR_DB_ECC_INTR);
36		edac_device_handle_ue(dci, 0, 0, dci->ctl_name);
37	}
38
39	return IRQ_HANDLED;
40}
41
42static const struct of_device_id hb_l2_err_of_match[] = {
43	{ .compatible = "calxeda,hb-sregs-l2-ecc", },
44	{},
45};
46MODULE_DEVICE_TABLE(of, hb_l2_err_of_match);
47
48static int highbank_l2_err_probe(struct platform_device *pdev)
49{
50	const struct of_device_id *id;
51	struct edac_device_ctl_info *dci;
52	struct hb_l2_drvdata *drvdata;
53	struct resource *r;
54	int res = 0;
55
56	dci = edac_device_alloc_ctl_info(sizeof(*drvdata), "cpu",
57		1, "L", 1, 2, NULL, 0, 0);
58	if (!dci)
59		return -ENOMEM;
60
61	drvdata = dci->pvt_info;
62	dci->dev = &pdev->dev;
63	platform_set_drvdata(pdev, dci);
64
65	if (!devres_open_group(&pdev->dev, NULL, GFP_KERNEL))
66		return -ENOMEM;
67
68	r = platform_get_resource(pdev, IORESOURCE_MEM, 0);
69	if (!r) {
70		dev_err(&pdev->dev, "Unable to get mem resource\n");
71		res = -ENODEV;
72		goto err;
73	}
74
75	if (!devm_request_mem_region(&pdev->dev, r->start,
76				     resource_size(r), dev_name(&pdev->dev))) {
77		dev_err(&pdev->dev, "Error while requesting mem region\n");
78		res = -EBUSY;
79		goto err;
80	}
81
82	drvdata->base = devm_ioremap(&pdev->dev, r->start, resource_size(r));
83	if (!drvdata->base) {
84		dev_err(&pdev->dev, "Unable to map regs\n");
85		res = -ENOMEM;
86		goto err;
87	}
88
89	id = of_match_device(hb_l2_err_of_match, &pdev->dev);
90	dci->mod_name = pdev->dev.driver->name;
91	dci->ctl_name = id ? id->compatible : "unknown";
92	dci->dev_name = dev_name(&pdev->dev);
93
94	if (edac_device_add_device(dci))
95		goto err;
96
97	drvdata->db_irq = platform_get_irq(pdev, 0);
98	res = devm_request_irq(&pdev->dev, drvdata->db_irq,
99			       highbank_l2_err_handler,
100			       0, dev_name(&pdev->dev), dci);
101	if (res < 0)
102		goto err2;
103
104	drvdata->sb_irq = platform_get_irq(pdev, 1);
105	res = devm_request_irq(&pdev->dev, drvdata->sb_irq,
106			       highbank_l2_err_handler,
107			       0, dev_name(&pdev->dev), dci);
108	if (res < 0)
109		goto err2;
110
111	devres_close_group(&pdev->dev, NULL);
112	return 0;
113err2:
114	edac_device_del_device(&pdev->dev);
115err:
116	devres_release_group(&pdev->dev, NULL);
117	edac_device_free_ctl_info(dci);
118	return res;
119}
120
121static int highbank_l2_err_remove(struct platform_device *pdev)
122{
123	struct edac_device_ctl_info *dci = platform_get_drvdata(pdev);
124
125	edac_device_del_device(&pdev->dev);
126	edac_device_free_ctl_info(dci);
127	return 0;
128}
129
130static struct platform_driver highbank_l2_edac_driver = {
131	.probe = highbank_l2_err_probe,
132	.remove = highbank_l2_err_remove,
133	.driver = {
134		.name = "hb_l2_edac",
135		.of_match_table = hb_l2_err_of_match,
136	},
137};
138
139module_platform_driver(highbank_l2_edac_driver);
140
141MODULE_LICENSE("GPL v2");
142MODULE_AUTHOR("Calxeda, Inc.");
143MODULE_DESCRIPTION("EDAC Driver for Calxeda Highbank L2 Cache");
144