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_module.h"
25
26 #define SR_CLR_SB_ECC_INTR 0x0
27 #define SR_CLR_DB_ECC_INTR 0x4
28
29 struct hb_l2_drvdata {
30 void __iomem *base;
31 int sb_irq;
32 int db_irq;
33 };
34
highbank_l2_err_handler(int irq,void * dev_id)35 static irqreturn_t highbank_l2_err_handler(int irq, void *dev_id)
36 {
37 struct edac_device_ctl_info *dci = dev_id;
38 struct hb_l2_drvdata *drvdata = dci->pvt_info;
39
40 if (irq == drvdata->sb_irq) {
41 writel(1, drvdata->base + SR_CLR_SB_ECC_INTR);
42 edac_device_handle_ce(dci, 0, 0, dci->ctl_name);
43 }
44 if (irq == drvdata->db_irq) {
45 writel(1, drvdata->base + SR_CLR_DB_ECC_INTR);
46 edac_device_handle_ue(dci, 0, 0, dci->ctl_name);
47 }
48
49 return IRQ_HANDLED;
50 }
51
52 static const struct of_device_id hb_l2_err_of_match[] = {
53 { .compatible = "calxeda,hb-sregs-l2-ecc", },
54 {},
55 };
56 MODULE_DEVICE_TABLE(of, hb_l2_err_of_match);
57
highbank_l2_err_probe(struct platform_device * pdev)58 static int highbank_l2_err_probe(struct platform_device *pdev)
59 {
60 const struct of_device_id *id;
61 struct edac_device_ctl_info *dci;
62 struct hb_l2_drvdata *drvdata;
63 struct resource *r;
64 int res = 0;
65
66 dci = edac_device_alloc_ctl_info(sizeof(*drvdata), "cpu",
67 1, "L", 1, 2, NULL, 0, 0);
68 if (!dci)
69 return -ENOMEM;
70
71 drvdata = dci->pvt_info;
72 dci->dev = &pdev->dev;
73 platform_set_drvdata(pdev, dci);
74
75 if (!devres_open_group(&pdev->dev, NULL, GFP_KERNEL))
76 return -ENOMEM;
77
78 r = platform_get_resource(pdev, IORESOURCE_MEM, 0);
79 if (!r) {
80 dev_err(&pdev->dev, "Unable to get mem resource\n");
81 res = -ENODEV;
82 goto err;
83 }
84
85 if (!devm_request_mem_region(&pdev->dev, r->start,
86 resource_size(r), dev_name(&pdev->dev))) {
87 dev_err(&pdev->dev, "Error while requesting mem region\n");
88 res = -EBUSY;
89 goto err;
90 }
91
92 drvdata->base = devm_ioremap(&pdev->dev, r->start, resource_size(r));
93 if (!drvdata->base) {
94 dev_err(&pdev->dev, "Unable to map regs\n");
95 res = -ENOMEM;
96 goto err;
97 }
98
99 id = of_match_device(hb_l2_err_of_match, &pdev->dev);
100 dci->mod_name = pdev->dev.driver->name;
101 dci->ctl_name = id ? id->compatible : "unknown";
102 dci->dev_name = dev_name(&pdev->dev);
103
104 if (edac_device_add_device(dci))
105 goto err;
106
107 drvdata->db_irq = platform_get_irq(pdev, 0);
108 res = devm_request_irq(&pdev->dev, drvdata->db_irq,
109 highbank_l2_err_handler,
110 0, dev_name(&pdev->dev), dci);
111 if (res < 0)
112 goto err2;
113
114 drvdata->sb_irq = platform_get_irq(pdev, 1);
115 res = devm_request_irq(&pdev->dev, drvdata->sb_irq,
116 highbank_l2_err_handler,
117 0, dev_name(&pdev->dev), dci);
118 if (res < 0)
119 goto err2;
120
121 devres_close_group(&pdev->dev, NULL);
122 return 0;
123 err2:
124 edac_device_del_device(&pdev->dev);
125 err:
126 devres_release_group(&pdev->dev, NULL);
127 edac_device_free_ctl_info(dci);
128 return res;
129 }
130
highbank_l2_err_remove(struct platform_device * pdev)131 static int highbank_l2_err_remove(struct platform_device *pdev)
132 {
133 struct edac_device_ctl_info *dci = platform_get_drvdata(pdev);
134
135 edac_device_del_device(&pdev->dev);
136 edac_device_free_ctl_info(dci);
137 return 0;
138 }
139
140 static struct platform_driver highbank_l2_edac_driver = {
141 .probe = highbank_l2_err_probe,
142 .remove = highbank_l2_err_remove,
143 .driver = {
144 .name = "hb_l2_edac",
145 .of_match_table = hb_l2_err_of_match,
146 },
147 };
148
149 module_platform_driver(highbank_l2_edac_driver);
150
151 MODULE_LICENSE("GPL v2");
152 MODULE_AUTHOR("Calxeda, Inc.");
153 MODULE_DESCRIPTION("EDAC Driver for Calxeda Highbank L2 Cache");
154