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