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
18 struct hb_l2_drvdata {
19 void __iomem *base;
20 int sb_irq;
21 int db_irq;
22 };
23
highbank_l2_err_handler(int irq,void * dev_id)24 static 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
41 static const struct of_device_id hb_l2_err_of_match[] = {
42 { .compatible = "calxeda,hb-sregs-l2-ecc", },
43 {},
44 };
45 MODULE_DEVICE_TABLE(of, hb_l2_err_of_match);
46
highbank_l2_err_probe(struct platform_device * pdev)47 static 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;
112 err2:
113 edac_device_del_device(&pdev->dev);
114 err:
115 devres_release_group(&pdev->dev, NULL);
116 edac_device_free_ctl_info(dci);
117 return res;
118 }
119
highbank_l2_err_remove(struct platform_device * pdev)120 static 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
129 static 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
138 module_platform_driver(highbank_l2_edac_driver);
139
140 MODULE_LICENSE("GPL v2");
141 MODULE_AUTHOR("Calxeda, Inc.");
142 MODULE_DESCRIPTION("EDAC Driver for Calxeda Highbank L2 Cache");
143