summaryrefslogtreecommitdiff
path: root/drivers/mcb/mcb-lpc.c
blob: a851e02364642d4772e44d01a3a28a74d3b87d23 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
// SPDX-License-Identifier: GPL-2.0-only
/*
 * MEN Chameleon Bus.
 *
 * Copyright (C) 2014 MEN Mikroelektronik GmbH (www.men.de)
 * Author: Andreas Werner <andreas.werner@men.de>
 */

#include <linux/platform_device.h>
#include <linux/module.h>
#include <linux/dmi.h>
#include <linux/mcb.h>
#include <linux/io.h>
#include "mcb-internal.h"

struct priv {
	struct mcb_bus *bus;
	struct resource *mem;
	void __iomem *base;
};

static int mcb_lpc_probe(struct platform_device *pdev)
{
	struct resource *res;
	struct priv *priv;
	int ret = 0, table_size;

	priv = devm_kzalloc(&pdev->dev, sizeof(*priv), GFP_KERNEL);
	if (!priv)
		return -ENOMEM;

	priv->mem = platform_get_resource(pdev, IORESOURCE_MEM, 0);
	if (!priv->mem) {
		dev_err(&pdev->dev, "No Memory resource\n");
		return -ENODEV;
	}

	res = devm_request_mem_region(&pdev->dev, priv->mem->start,
				      resource_size(priv->mem),
				      KBUILD_MODNAME);
	if (!res) {
		dev_err(&pdev->dev, "Failed to request IO memory\n");
		return -EBUSY;
	}

	priv->base = devm_ioremap(&pdev->dev, priv->mem->start,
				  resource_size(priv->mem));
	if (!priv->base) {
		dev_err(&pdev->dev, "Cannot ioremap\n");
		return -ENOMEM;
	}

	platform_set_drvdata(pdev, priv);

	priv->bus = mcb_alloc_bus(&pdev->dev);
	if (IS_ERR(priv->bus))
		return PTR_ERR(priv->bus);

	ret = chameleon_parse_cells(priv->bus, priv->mem->start, priv->base);
	if (ret < 0) {
		goto out_mcb_bus;
	}

	table_size = ret;

	if (table_size < CHAM_HEADER_SIZE) {
		/* Release the previous resources */
		devm_iounmap(&pdev->dev, priv->base);
		devm_release_mem_region(&pdev->dev, priv->mem->start, resource_size(priv->mem));

		/* Then, allocate it again with the actual chameleon table size */
		res = devm_request_mem_region(&pdev->dev, priv->mem->start,
					      table_size,
					      KBUILD_MODNAME);
		if (!res) {
			dev_err(&pdev->dev, "Failed to request PCI memory\n");
			ret = -EBUSY;
			goto out_mcb_bus;
		}

		priv->base = devm_ioremap(&pdev->dev, priv->mem->start, table_size);
		if (!priv->base) {
			dev_err(&pdev->dev, "Cannot ioremap\n");
			ret = -ENOMEM;
			goto out_mcb_bus;
		}

		platform_set_drvdata(pdev, priv);
	}

	mcb_bus_add_devices(priv->bus);

	return 0;

out_mcb_bus:
	mcb_release_bus(priv->bus);
	return ret;
}

static int mcb_lpc_remove(struct platform_device *pdev)
{
	struct priv *priv = platform_get_drvdata(pdev);

	mcb_release_bus(priv->bus);

	return 0;
}

static struct platform_device *mcb_lpc_pdev;

static int mcb_lpc_create_platform_device(const struct dmi_system_id *id)
{
	struct resource *res = id->driver_data;
	int ret;

	mcb_lpc_pdev = platform_device_alloc("mcb-lpc", -1);
	if (!mcb_lpc_pdev)
		return -ENOMEM;

	ret = platform_device_add_resources(mcb_lpc_pdev, res, 1);
	if (ret)
		goto out_put;

	ret = platform_device_add(mcb_lpc_pdev);
	if (ret)
		goto out_put;

	return 0;

out_put:
	platform_device_put(mcb_lpc_pdev);
	return ret;
}

static struct resource sc24_fpga_resource = DEFINE_RES_MEM(0xe000e000, CHAM_HEADER_SIZE);
static struct resource sc31_fpga_resource = DEFINE_RES_MEM(0xf000e000, CHAM_HEADER_SIZE);

static struct platform_driver mcb_lpc_driver = {
	.driver		= {
		.name = "mcb-lpc",
	},
	.probe		= mcb_lpc_probe,
	.remove		= mcb_lpc_remove,
};

static const struct dmi_system_id mcb_lpc_dmi_table[] = {
	{
		.ident = "SC24",
		.matches = {
			DMI_MATCH(DMI_SYS_VENDOR, "MEN"),
			DMI_MATCH(DMI_PRODUCT_VERSION, "14SC24"),
		},
		.driver_data = (void *)&sc24_fpga_resource,
		.callback = mcb_lpc_create_platform_device,
	},
	{
		.ident = "SC31",
		.matches = {
			DMI_MATCH(DMI_SYS_VENDOR, "MEN"),
			DMI_MATCH(DMI_PRODUCT_VERSION, "14SC31"),
		},
		.driver_data = (void *)&sc31_fpga_resource,
		.callback = mcb_lpc_create_platform_device,
	},
	{}
};
MODULE_DEVICE_TABLE(dmi, mcb_lpc_dmi_table);

static int __init mcb_lpc_init(void)
{
	if (!dmi_check_system(mcb_lpc_dmi_table))
		return -ENODEV;

	return platform_driver_register(&mcb_lpc_driver);
}

static void __exit mcb_lpc_exit(void)
{
	platform_device_unregister(mcb_lpc_pdev);
	platform_driver_unregister(&mcb_lpc_driver);
}

module_init(mcb_lpc_init);
module_exit(mcb_lpc_exit);

MODULE_AUTHOR("Andreas Werner <andreas.werner@men.de>");
MODULE_LICENSE("GPL");
MODULE_DESCRIPTION("MCB over LPC support");
MODULE_IMPORT_NS(MCB);