summaryrefslogtreecommitdiff
path: root/drivers/crypto/ccp/sp-platform.c
blob: 47330123776015e15c5be1fc7008ce7cbb16295d (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
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
// SPDX-License-Identifier: GPL-2.0-only
/*
 * AMD Secure Processor device driver
 *
 * Copyright (C) 2014,2018 Advanced Micro Devices, Inc.
 *
 * Author: Tom Lendacky <thomas.lendacky@amd.com>
 */

#include <linux/module.h>
#include <linux/kernel.h>
#include <linux/device.h>
#include <linux/platform_device.h>
#include <linux/ioport.h>
#include <linux/dma-mapping.h>
#include <linux/kthread.h>
#include <linux/sched.h>
#include <linux/interrupt.h>
#include <linux/spinlock.h>
#include <linux/delay.h>
#include <linux/ccp.h>
#include <linux/of.h>
#include <linux/of_address.h>
#include <linux/acpi.h>

#include "ccp-dev.h"

struct sp_platform {
	int coherent;
	unsigned int irq_count;
};

static const struct sp_dev_vdata dev_vdata[] = {
	{
		.bar = 0,
#ifdef CONFIG_CRYPTO_DEV_SP_CCP
		.ccp_vdata = &ccpv3_platform,
#endif
	},
};

#ifdef CONFIG_ACPI
static const struct acpi_device_id sp_acpi_match[] = {
	{ "AMDI0C00", (kernel_ulong_t)&dev_vdata[0] },
	{ },
};
MODULE_DEVICE_TABLE(acpi, sp_acpi_match);
#endif

#ifdef CONFIG_OF
static const struct of_device_id sp_of_match[] = {
	{ .compatible = "amd,ccp-seattle-v1a",
	  .data = (const void *)&dev_vdata[0] },
	{ },
};
MODULE_DEVICE_TABLE(of, sp_of_match);
#endif

static struct sp_dev_vdata *sp_get_of_version(struct platform_device *pdev)
{
#ifdef CONFIG_OF
	const struct of_device_id *match;

	match = of_match_node(sp_of_match, pdev->dev.of_node);
	if (match && match->data)
		return (struct sp_dev_vdata *)match->data;
#endif
	return NULL;
}

static struct sp_dev_vdata *sp_get_acpi_version(struct platform_device *pdev)
{
#ifdef CONFIG_ACPI
	const struct acpi_device_id *match;

	match = acpi_match_device(sp_acpi_match, &pdev->dev);
	if (match && match->driver_data)
		return (struct sp_dev_vdata *)match->driver_data;
#endif
	return NULL;
}

static int sp_get_irqs(struct sp_device *sp)
{
	struct sp_platform *sp_platform = sp->dev_specific;
	struct device *dev = sp->dev;
	struct platform_device *pdev = to_platform_device(dev);
	int ret;

	sp_platform->irq_count = platform_irq_count(pdev);

	ret = platform_get_irq(pdev, 0);
	if (ret < 0) {
		dev_notice(dev, "unable to get IRQ (%d)\n", ret);
		return ret;
	}

	sp->psp_irq = ret;
	if (sp_platform->irq_count == 1) {
		sp->ccp_irq = ret;
	} else {
		ret = platform_get_irq(pdev, 1);
		if (ret < 0) {
			dev_notice(dev, "unable to get IRQ (%d)\n", ret);
			return ret;
		}

		sp->ccp_irq = ret;
	}

	return 0;
}

static int sp_platform_probe(struct platform_device *pdev)
{
	struct sp_device *sp;
	struct sp_platform *sp_platform;
	struct device *dev = &pdev->dev;
	enum dev_dma_attr attr;
	int ret;

	ret = -ENOMEM;
	sp = sp_alloc_struct(dev);
	if (!sp)
		goto e_err;

	sp_platform = devm_kzalloc(dev, sizeof(*sp_platform), GFP_KERNEL);
	if (!sp_platform)
		goto e_err;

	sp->dev_specific = sp_platform;
	sp->dev_vdata = pdev->dev.of_node ? sp_get_of_version(pdev)
					 : sp_get_acpi_version(pdev);
	if (!sp->dev_vdata) {
		ret = -ENODEV;
		dev_err(dev, "missing driver data\n");
		goto e_err;
	}

	sp->io_map = devm_platform_ioremap_resource(pdev, 0);
	if (IS_ERR(sp->io_map)) {
		ret = PTR_ERR(sp->io_map);
		goto e_err;
	}

	attr = device_get_dma_attr(dev);
	if (attr == DEV_DMA_NOT_SUPPORTED) {
		dev_err(dev, "DMA is not supported");
		goto e_err;
	}

	sp_platform->coherent = (attr == DEV_DMA_COHERENT);
	if (sp_platform->coherent)
		sp->axcache = CACHE_WB_NO_ALLOC;
	else
		sp->axcache = CACHE_NONE;

	ret = dma_set_mask_and_coherent(dev, DMA_BIT_MASK(48));
	if (ret) {
		dev_err(dev, "dma_set_mask_and_coherent failed (%d)\n", ret);
		goto e_err;
	}

	ret = sp_get_irqs(sp);
	if (ret)
		goto e_err;

	dev_set_drvdata(dev, sp);

	ret = sp_init(sp);
	if (ret)
		goto e_err;

	dev_notice(dev, "enabled\n");

	return 0;

e_err:
	dev_notice(dev, "initialization failed\n");
	return ret;
}

static void sp_platform_remove(struct platform_device *pdev)
{
	struct device *dev = &pdev->dev;
	struct sp_device *sp = dev_get_drvdata(dev);

	sp_destroy(sp);

	dev_notice(dev, "disabled\n");
}

#ifdef CONFIG_PM
static int sp_platform_suspend(struct platform_device *pdev,
				pm_message_t state)
{
	struct device *dev = &pdev->dev;
	struct sp_device *sp = dev_get_drvdata(dev);

	return sp_suspend(sp);
}

static int sp_platform_resume(struct platform_device *pdev)
{
	struct device *dev = &pdev->dev;
	struct sp_device *sp = dev_get_drvdata(dev);

	return sp_resume(sp);
}
#endif

static struct platform_driver sp_platform_driver = {
	.driver = {
		.name = "ccp",
#ifdef CONFIG_ACPI
		.acpi_match_table = sp_acpi_match,
#endif
#ifdef CONFIG_OF
		.of_match_table = sp_of_match,
#endif
	},
	.probe = sp_platform_probe,
	.remove_new = sp_platform_remove,
#ifdef CONFIG_PM
	.suspend = sp_platform_suspend,
	.resume = sp_platform_resume,
#endif
};

int sp_platform_init(void)
{
	return platform_driver_register(&sp_platform_driver);
}

void sp_platform_exit(void)
{
	platform_driver_unregister(&sp_platform_driver);
}