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187 lines · 4.2 KiB

1// SPDX-License-Identifier: GPL-2.0-only
2/*
3 * MEN Chameleon Bus.
4 *
5 * Copyright (C) 2014 MEN Mikroelektronik GmbH (www.men.de)
6 * Author: Andreas Werner <[email protected]>
7 */
8
9#include <linux/platform_device.h>
10#include <linux/module.h>
11#include <linux/dmi.h>
12#include <linux/mcb.h>
13#include <linux/io.h>
14#include "mcb-internal.h"
15
16struct priv {
17 struct mcb_bus *bus;
18 struct resource *mem;
19 void __iomem *base;
20};
21
22static int mcb_lpc_probe(struct platform_device *pdev)
23{
24 struct resource *res;
25 struct priv *priv;
26 int ret = 0, table_size;
27
28 priv = devm_kzalloc(&pdev->dev, sizeof(*priv), GFP_KERNEL);
29 if (!priv)
30 return -ENOMEM;
31
32 priv->mem = platform_get_resource(pdev, IORESOURCE_MEM, 0);
33 if (!priv->mem) {
34 dev_err(&pdev->dev, "No Memory resource\n");
35 return -ENODEV;
36 }
37
38 res = devm_request_mem_region(&pdev->dev, priv->mem->start,
39 resource_size(priv->mem),
40 KBUILD_MODNAME);
41 if (!res) {
42 dev_err(&pdev->dev, "Failed to request IO memory\n");
43 return -EBUSY;
44 }
45
46 priv->base = devm_ioremap(&pdev->dev, priv->mem->start,
47 resource_size(priv->mem));
48 if (!priv->base) {
49 dev_err(&pdev->dev, "Cannot ioremap\n");
50 return -ENOMEM;
51 }
52
53 platform_set_drvdata(pdev, priv);
54
55 priv->bus = mcb_alloc_bus(&pdev->dev);
56 if (IS_ERR(priv->bus))
57 return PTR_ERR(priv->bus);
58
59 ret = chameleon_parse_cells(priv->bus, priv->mem->start, priv->base);
60 if (ret < 0) {
61 goto out_mcb_bus;
62 }
63
64 table_size = ret;
65
66 if (table_size < CHAM_HEADER_SIZE) {
67 /* Release the previous resources */
68 devm_iounmap(&pdev->dev, priv->base);
69 devm_release_mem_region(&pdev->dev, priv->mem->start, resource_size(priv->mem));
70
71 /* Then, allocate it again with the actual chameleon table size */
72 res = devm_request_mem_region(&pdev->dev, priv->mem->start,
73 table_size,
74 KBUILD_MODNAME);
75 if (!res) {
76 dev_err(&pdev->dev, "Failed to request PCI memory\n");
77 ret = -EBUSY;
78 goto out_mcb_bus;
79 }
80
81 priv->base = devm_ioremap(&pdev->dev, priv->mem->start, table_size);
82 if (!priv->base) {
83 dev_err(&pdev->dev, "Cannot ioremap\n");
84 ret = -ENOMEM;
85 goto out_mcb_bus;
86 }
87
88 platform_set_drvdata(pdev, priv);
89 }
90
91 mcb_bus_add_devices(priv->bus);
92
93 return 0;
94
95out_mcb_bus:
96 mcb_release_bus(priv->bus);
97 return ret;
98}
99
100static void mcb_lpc_remove(struct platform_device *pdev)
101{
102 struct priv *priv = platform_get_drvdata(pdev);
103
104 mcb_release_bus(priv->bus);
105}
106
107static struct platform_device *mcb_lpc_pdev;
108
109static int mcb_lpc_create_platform_device(const struct dmi_system_id *id)
110{
111 struct resource *res = id->driver_data;
112 int ret;
113
114 mcb_lpc_pdev = platform_device_alloc("mcb-lpc", -1);
115 if (!mcb_lpc_pdev)
116 return -ENOMEM;
117
118 ret = platform_device_add_resources(mcb_lpc_pdev, res, 1);
119 if (ret)
120 goto out_put;
121
122 ret = platform_device_add(mcb_lpc_pdev);
123 if (ret)
124 goto out_put;
125
126 return 0;
127
128out_put:
129 platform_device_put(mcb_lpc_pdev);
130 return ret;
131}
132
133static struct resource sc24_fpga_resource = DEFINE_RES_MEM(0xe000e000, CHAM_HEADER_SIZE);
134static struct resource sc31_fpga_resource = DEFINE_RES_MEM(0xf000e000, CHAM_HEADER_SIZE);
135
136static struct platform_driver mcb_lpc_driver = {
137 .driver = {
138 .name = "mcb-lpc",
139 },
140 .probe = mcb_lpc_probe,
141 .remove = mcb_lpc_remove,
142};
143
144static const struct dmi_system_id mcb_lpc_dmi_table[] = {
145 {
146 .ident = "SC24",
147 .matches = {
148 DMI_MATCH(DMI_SYS_VENDOR, "MEN"),
149 DMI_MATCH(DMI_PRODUCT_VERSION, "14SC24"),
150 },
151 .driver_data = (void *)&sc24_fpga_resource,
152 .callback = mcb_lpc_create_platform_device,
153 },
154 {
155 .ident = "SC31",
156 .matches = {
157 DMI_MATCH(DMI_SYS_VENDOR, "MEN"),
158 DMI_MATCH(DMI_PRODUCT_VERSION, "14SC31"),
159 },
160 .driver_data = (void *)&sc31_fpga_resource,
161 .callback = mcb_lpc_create_platform_device,
162 },
163 {}
164};
165MODULE_DEVICE_TABLE(dmi, mcb_lpc_dmi_table);
166
167static int __init mcb_lpc_init(void)
168{
169 if (!dmi_check_system(mcb_lpc_dmi_table))
170 return -ENODEV;
171
172 return platform_driver_register(&mcb_lpc_driver);
173}
174
175static void __exit mcb_lpc_exit(void)
176{
177 platform_device_unregister(mcb_lpc_pdev);
178 platform_driver_unregister(&mcb_lpc_driver);
179}
180
181module_init(mcb_lpc_init);
182module_exit(mcb_lpc_exit);
183
184MODULE_AUTHOR("Andreas Werner <[email protected]>");
185MODULE_LICENSE("GPL");
186MODULE_DESCRIPTION("MCB over LPC support");
187MODULE_IMPORT_NS("MCB");