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 | |
19 | struct hb_l2_drvdata { |
20 | void __iomem *base; |
21 | int sb_irq; |
22 | int db_irq; |
23 | }; |
24 | |
25 | static 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(val: 1, addr: drvdata->base + SR_CLR_SB_ECC_INTR); |
32 | edac_device_handle_ce(edac_dev: dci, inst_nr: 0, block_nr: 0, msg: dci->ctl_name); |
33 | } |
34 | if (irq == drvdata->db_irq) { |
35 | writel(val: 1, addr: drvdata->base + SR_CLR_DB_ECC_INTR); |
36 | edac_device_handle_ue(edac_dev: dci, inst_nr: 0, block_nr: 0, msg: dci->ctl_name); |
37 | } |
38 | |
39 | return IRQ_HANDLED; |
40 | } |
41 | |
42 | static const struct of_device_id hb_l2_err_of_match[] = { |
43 | { .compatible = "calxeda,hb-sregs-l2-ecc" , }, |
44 | {}, |
45 | }; |
46 | MODULE_DEVICE_TABLE(of, hb_l2_err_of_match); |
47 | |
48 | static 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_private: sizeof(*drvdata), edac_device_name: "cpu" , |
57 | nr_instances: 1, edac_block_name: "L" , nr_blocks: 1, offset_value: 2, NULL, nr_attribs: 0, device_index: 0); |
58 | if (!dci) |
59 | return -ENOMEM; |
60 | |
61 | drvdata = dci->pvt_info; |
62 | dci->dev = &pdev->dev; |
63 | platform_set_drvdata(pdev, data: dci); |
64 | |
65 | if (!devres_open_group(dev: &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(dev: &pdev->dev, offset: r->start, size: resource_size(res: 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(matches: hb_l2_err_of_match, dev: &pdev->dev); |
90 | dci->mod_name = pdev->dev.driver->name; |
91 | dci->ctl_name = id ? id->compatible : "unknown" ; |
92 | dci->dev_name = dev_name(dev: &pdev->dev); |
93 | |
94 | if (edac_device_add_device(edac_dev: dci)) |
95 | goto err; |
96 | |
97 | drvdata->db_irq = platform_get_irq(pdev, 0); |
98 | res = devm_request_irq(dev: &pdev->dev, irq: drvdata->db_irq, |
99 | handler: highbank_l2_err_handler, |
100 | irqflags: 0, devname: dev_name(dev: &pdev->dev), dev_id: dci); |
101 | if (res < 0) |
102 | goto err2; |
103 | |
104 | drvdata->sb_irq = platform_get_irq(pdev, 1); |
105 | res = devm_request_irq(dev: &pdev->dev, irq: drvdata->sb_irq, |
106 | handler: highbank_l2_err_handler, |
107 | irqflags: 0, devname: dev_name(dev: &pdev->dev), dev_id: dci); |
108 | if (res < 0) |
109 | goto err2; |
110 | |
111 | devres_close_group(dev: &pdev->dev, NULL); |
112 | return 0; |
113 | err2: |
114 | edac_device_del_device(dev: &pdev->dev); |
115 | err: |
116 | devres_release_group(dev: &pdev->dev, NULL); |
117 | edac_device_free_ctl_info(ctl_info: dci); |
118 | return res; |
119 | } |
120 | |
121 | static void 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(dev: &pdev->dev); |
126 | edac_device_free_ctl_info(ctl_info: dci); |
127 | } |
128 | |
129 | static struct platform_driver highbank_l2_edac_driver = { |
130 | .probe = highbank_l2_err_probe, |
131 | .remove_new = 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 | |