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
|
/*
* AMD Cryptographic Coprocessor (CCP) driver
*
* Copyright (C) 2014 Advanced Micro Devices, Inc.
*
* Author: Tom Lendacky <thomas.lendacky@amd.com>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2 as
* published by the Free Software Foundation.
*/
#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 "ccp-dev.h"
static int ccp_get_irq(struct ccp_device *ccp)
{
struct device *dev = ccp->dev;
struct platform_device *pdev = container_of(dev,
struct platform_device, dev);
int ret;
ret = platform_get_irq(pdev, 0);
if (ret < 0)
return ret;
ccp->irq = ret;
ret = request_irq(ccp->irq, ccp_irq_handler, 0, "ccp", dev);
if (ret) {
dev_notice(dev, "unable to allocate IRQ (%d)\n", ret);
return ret;
}
return 0;
}
static int ccp_get_irqs(struct ccp_device *ccp)
{
struct device *dev = ccp->dev;
int ret;
ret = ccp_get_irq(ccp);
if (!ret)
return 0;
/* Couldn't get an interrupt */
dev_notice(dev, "could not enable interrupts (%d)\n", ret);
return ret;
}
static void ccp_free_irqs(struct ccp_device *ccp)
{
struct device *dev = ccp->dev;
free_irq(ccp->irq, dev);
}
static struct resource *ccp_find_mmio_area(struct ccp_device *ccp)
{
struct device *dev = ccp->dev;
struct platform_device *pdev = container_of(dev,
struct platform_device, dev);
struct resource *ior;
ior = platform_get_resource(pdev, IORESOURCE_MEM, 0);
if (ior && (resource_size(ior) >= 0x800))
return ior;
return NULL;
}
static int ccp_platform_probe(struct platform_device *pdev)
{
struct ccp_device *ccp;
struct device *dev = &pdev->dev;
struct resource *ior;
int ret;
ret = -ENOMEM;
ccp = ccp_alloc_struct(dev);
if (!ccp)
goto e_err;
ccp->dev_specific = NULL;
ccp->get_irq = ccp_get_irqs;
ccp->free_irq = ccp_free_irqs;
ior = ccp_find_mmio_area(ccp);
ccp->io_map = devm_ioremap_resource(dev, ior);
if (IS_ERR(ccp->io_map)) {
ret = PTR_ERR(ccp->io_map);
goto e_free;
}
ccp->io_regs = ccp->io_map;
if (!dev->dma_mask)
dev->dma_mask = &dev->coherent_dma_mask;
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_free;
}
if (of_property_read_bool(dev->of_node, "dma-coherent"))
ccp->axcache = CACHE_WB_NO_ALLOC;
else
ccp->axcache = CACHE_NONE;
dev_set_drvdata(dev, ccp);
ret = ccp_init(ccp);
if (ret)
goto e_free;
dev_notice(dev, "enabled\n");
return 0;
e_free:
kfree(ccp);
e_err:
dev_notice(dev, "initialization failed\n");
return ret;
}
static int ccp_platform_remove(struct platform_device *pdev)
{
struct device *dev = &pdev->dev;
struct ccp_device *ccp = dev_get_drvdata(dev);
ccp_destroy(ccp);
kfree(ccp);
dev_notice(dev, "disabled\n");
return 0;
}
#ifdef CONFIG_PM
static int ccp_platform_suspend(struct platform_device *pdev,
pm_message_t state)
{
struct device *dev = &pdev->dev;
struct ccp_device *ccp = dev_get_drvdata(dev);
unsigned long flags;
unsigned int i;
spin_lock_irqsave(&ccp->cmd_lock, flags);
ccp->suspending = 1;
/* Wake all the queue kthreads to prepare for suspend */
for (i = 0; i < ccp->cmd_q_count; i++)
wake_up_process(ccp->cmd_q[i].kthread);
spin_unlock_irqrestore(&ccp->cmd_lock, flags);
/* Wait for all queue kthreads to say they're done */
while (!ccp_queues_suspended(ccp))
wait_event_interruptible(ccp->suspend_queue,
ccp_queues_suspended(ccp));
return 0;
}
static int ccp_platform_resume(struct platform_device *pdev)
{
struct device *dev = &pdev->dev;
struct ccp_device *ccp = dev_get_drvdata(dev);
unsigned long flags;
unsigned int i;
spin_lock_irqsave(&ccp->cmd_lock, flags);
ccp->suspending = 0;
/* Wake up all the kthreads */
for (i = 0; i < ccp->cmd_q_count; i++) {
ccp->cmd_q[i].suspended = 0;
wake_up_process(ccp->cmd_q[i].kthread);
}
spin_unlock_irqrestore(&ccp->cmd_lock, flags);
return 0;
}
#endif
static const struct of_device_id ccp_platform_ids[] = {
{ .compatible = "amd,ccp-seattle-v1a" },
{ },
};
static struct platform_driver ccp_platform_driver = {
.driver = {
.name = "AMD Cryptographic Coprocessor",
.of_match_table = ccp_platform_ids,
},
.probe = ccp_platform_probe,
.remove = ccp_platform_remove,
#ifdef CONFIG_PM
.suspend = ccp_platform_suspend,
.resume = ccp_platform_resume,
#endif
};
int ccp_platform_init(void)
{
return platform_driver_register(&ccp_platform_driver);
}
void ccp_platform_exit(void)
{
platform_driver_unregister(&ccp_platform_driver);
}
|
