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 <andreas.werner@men.de>
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
16 struct priv {
17 struct mcb_bus *bus;
18 struct resource *mem;
19 void __iomem *base;
20 };
21
mcb_lpc_probe(struct platform_device * pdev)22 static 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
95 out_mcb_bus:
96 mcb_release_bus(priv->bus);
97 return ret;
98 }
99
mcb_lpc_remove(struct platform_device * pdev)100 static int 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 return 0;
107 }
108
109 static struct platform_device *mcb_lpc_pdev;
110
mcb_lpc_create_platform_device(const struct dmi_system_id * id)111 static int mcb_lpc_create_platform_device(const struct dmi_system_id *id)
112 {
113 struct resource *res = id->driver_data;
114 int ret;
115
116 mcb_lpc_pdev = platform_device_alloc("mcb-lpc", -1);
117 if (!mcb_lpc_pdev)
118 return -ENOMEM;
119
120 ret = platform_device_add_resources(mcb_lpc_pdev, res, 1);
121 if (ret)
122 goto out_put;
123
124 ret = platform_device_add(mcb_lpc_pdev);
125 if (ret)
126 goto out_put;
127
128 return 0;
129
130 out_put:
131 platform_device_put(mcb_lpc_pdev);
132 return ret;
133 }
134
135 static struct resource sc24_fpga_resource = DEFINE_RES_MEM(0xe000e000, CHAM_HEADER_SIZE);
136 static struct resource sc31_fpga_resource = DEFINE_RES_MEM(0xf000e000, CHAM_HEADER_SIZE);
137
138 static struct platform_driver mcb_lpc_driver = {
139 .driver = {
140 .name = "mcb-lpc",
141 },
142 .probe = mcb_lpc_probe,
143 .remove = mcb_lpc_remove,
144 };
145
146 static const struct dmi_system_id mcb_lpc_dmi_table[] = {
147 {
148 .ident = "SC24",
149 .matches = {
150 DMI_MATCH(DMI_SYS_VENDOR, "MEN"),
151 DMI_MATCH(DMI_PRODUCT_VERSION, "14SC24"),
152 },
153 .driver_data = (void *)&sc24_fpga_resource,
154 .callback = mcb_lpc_create_platform_device,
155 },
156 {
157 .ident = "SC31",
158 .matches = {
159 DMI_MATCH(DMI_SYS_VENDOR, "MEN"),
160 DMI_MATCH(DMI_PRODUCT_VERSION, "14SC31"),
161 },
162 .driver_data = (void *)&sc31_fpga_resource,
163 .callback = mcb_lpc_create_platform_device,
164 },
165 {}
166 };
167 MODULE_DEVICE_TABLE(dmi, mcb_lpc_dmi_table);
168
mcb_lpc_init(void)169 static int __init mcb_lpc_init(void)
170 {
171 if (!dmi_check_system(mcb_lpc_dmi_table))
172 return -ENODEV;
173
174 return platform_driver_register(&mcb_lpc_driver);
175 }
176
mcb_lpc_exit(void)177 static void __exit mcb_lpc_exit(void)
178 {
179 platform_device_unregister(mcb_lpc_pdev);
180 platform_driver_unregister(&mcb_lpc_driver);
181 }
182
183 module_init(mcb_lpc_init);
184 module_exit(mcb_lpc_exit);
185
186 MODULE_AUTHOR("Andreas Werner <andreas.werner@men.de>");
187 MODULE_LICENSE("GPL");
188 MODULE_DESCRIPTION("MCB over LPC support");
189 MODULE_IMPORT_NS(MCB);
190