1 // SPDX-License-Identifier: GPL-2.0-only
2 /*
3 * AMD Secure Processor device driver
4 *
5 * Copyright (C) 2014,2018 Advanced Micro Devices, Inc.
6 *
7 * Author: Tom Lendacky <thomas.lendacky@amd.com>
8 */
9
10 #include <linux/module.h>
11 #include <linux/kernel.h>
12 #include <linux/device.h>
13 #include <linux/platform_device.h>
14 #include <linux/ioport.h>
15 #include <linux/dma-mapping.h>
16 #include <linux/kthread.h>
17 #include <linux/sched.h>
18 #include <linux/interrupt.h>
19 #include <linux/spinlock.h>
20 #include <linux/delay.h>
21 #include <linux/ccp.h>
22 #include <linux/of.h>
23 #include <linux/of_address.h>
24 #include <linux/acpi.h>
25
26 #include "ccp-dev.h"
27
28 struct sp_platform {
29 int coherent;
30 unsigned int irq_count;
31 };
32
33 static const struct sp_dev_vdata dev_vdata[] = {
34 {
35 .bar = 0,
36 #ifdef CONFIG_CRYPTO_DEV_SP_CCP
37 .ccp_vdata = &ccpv3_platform,
38 #endif
39 },
40 };
41
42 static const struct acpi_device_id sp_acpi_match[] = {
43 { "AMDI0C00", (kernel_ulong_t)&dev_vdata[0] },
44 { },
45 };
46 MODULE_DEVICE_TABLE(acpi, sp_acpi_match);
47
48 static const struct of_device_id sp_of_match[] = {
49 { .compatible = "amd,ccp-seattle-v1a",
50 .data = (const void *)&dev_vdata[0] },
51 { },
52 };
53 MODULE_DEVICE_TABLE(of, sp_of_match);
54
sp_get_of_version(struct platform_device * pdev)55 static struct sp_dev_vdata *sp_get_of_version(struct platform_device *pdev)
56 {
57 const struct of_device_id *match;
58
59 match = of_match_node(sp_of_match, pdev->dev.of_node);
60 if (match && match->data)
61 return (struct sp_dev_vdata *)match->data;
62
63 return NULL;
64 }
65
sp_get_acpi_version(struct platform_device * pdev)66 static struct sp_dev_vdata *sp_get_acpi_version(struct platform_device *pdev)
67 {
68 const struct acpi_device_id *match;
69
70 match = acpi_match_device(sp_acpi_match, &pdev->dev);
71 if (match && match->driver_data)
72 return (struct sp_dev_vdata *)match->driver_data;
73
74 return NULL;
75 }
76
sp_get_irqs(struct sp_device * sp)77 static int sp_get_irqs(struct sp_device *sp)
78 {
79 struct sp_platform *sp_platform = sp->dev_specific;
80 struct device *dev = sp->dev;
81 struct platform_device *pdev = to_platform_device(dev);
82 int ret;
83
84 sp_platform->irq_count = platform_irq_count(pdev);
85
86 ret = platform_get_irq(pdev, 0);
87 if (ret < 0) {
88 dev_notice(dev, "unable to get IRQ (%d)\n", ret);
89 return ret;
90 }
91
92 sp->psp_irq = ret;
93 if (sp_platform->irq_count == 1) {
94 sp->ccp_irq = ret;
95 } else {
96 ret = platform_get_irq(pdev, 1);
97 if (ret < 0) {
98 dev_notice(dev, "unable to get IRQ (%d)\n", ret);
99 return ret;
100 }
101
102 sp->ccp_irq = ret;
103 }
104
105 return 0;
106 }
107
sp_platform_probe(struct platform_device * pdev)108 static int sp_platform_probe(struct platform_device *pdev)
109 {
110 struct sp_device *sp;
111 struct sp_platform *sp_platform;
112 struct device *dev = &pdev->dev;
113 enum dev_dma_attr attr;
114 int ret;
115
116 ret = -ENOMEM;
117 sp = sp_alloc_struct(dev);
118 if (!sp)
119 goto e_err;
120
121 sp_platform = devm_kzalloc(dev, sizeof(*sp_platform), GFP_KERNEL);
122 if (!sp_platform)
123 goto e_err;
124
125 sp->dev_specific = sp_platform;
126 sp->dev_vdata = pdev->dev.of_node ? sp_get_of_version(pdev)
127 : sp_get_acpi_version(pdev);
128 if (!sp->dev_vdata) {
129 ret = -ENODEV;
130 dev_err(dev, "missing driver data\n");
131 goto e_err;
132 }
133
134 sp->io_map = devm_platform_ioremap_resource(pdev, 0);
135 if (IS_ERR(sp->io_map)) {
136 ret = PTR_ERR(sp->io_map);
137 goto e_err;
138 }
139
140 attr = device_get_dma_attr(dev);
141 if (attr == DEV_DMA_NOT_SUPPORTED) {
142 dev_err(dev, "DMA is not supported");
143 goto e_err;
144 }
145
146 sp_platform->coherent = (attr == DEV_DMA_COHERENT);
147 if (sp_platform->coherent)
148 sp->axcache = CACHE_WB_NO_ALLOC;
149 else
150 sp->axcache = CACHE_NONE;
151
152 ret = dma_set_mask_and_coherent(dev, DMA_BIT_MASK(48));
153 if (ret) {
154 dev_err(dev, "dma_set_mask_and_coherent failed (%d)\n", ret);
155 goto e_err;
156 }
157
158 ret = sp_get_irqs(sp);
159 if (ret)
160 goto e_err;
161
162 dev_set_drvdata(dev, sp);
163
164 ret = sp_init(sp);
165 if (ret)
166 goto e_err;
167
168 dev_notice(dev, "enabled\n");
169
170 return 0;
171
172 e_err:
173 dev_notice(dev, "initialization failed\n");
174 return ret;
175 }
176
sp_platform_remove(struct platform_device * pdev)177 static int sp_platform_remove(struct platform_device *pdev)
178 {
179 struct device *dev = &pdev->dev;
180 struct sp_device *sp = dev_get_drvdata(dev);
181
182 sp_destroy(sp);
183
184 dev_notice(dev, "disabled\n");
185
186 return 0;
187 }
188
189 #ifdef CONFIG_PM
sp_platform_suspend(struct platform_device * pdev,pm_message_t state)190 static int sp_platform_suspend(struct platform_device *pdev,
191 pm_message_t state)
192 {
193 struct device *dev = &pdev->dev;
194 struct sp_device *sp = dev_get_drvdata(dev);
195
196 return sp_suspend(sp);
197 }
198
sp_platform_resume(struct platform_device * pdev)199 static int sp_platform_resume(struct platform_device *pdev)
200 {
201 struct device *dev = &pdev->dev;
202 struct sp_device *sp = dev_get_drvdata(dev);
203
204 return sp_resume(sp);
205 }
206 #endif
207
208 static struct platform_driver sp_platform_driver = {
209 .driver = {
210 .name = "ccp",
211 .acpi_match_table = sp_acpi_match,
212 .of_match_table = sp_of_match,
213 },
214 .probe = sp_platform_probe,
215 .remove = sp_platform_remove,
216 #ifdef CONFIG_PM
217 .suspend = sp_platform_suspend,
218 .resume = sp_platform_resume,
219 #endif
220 };
221
sp_platform_init(void)222 int sp_platform_init(void)
223 {
224 return platform_driver_register(&sp_platform_driver);
225 }
226
sp_platform_exit(void)227 void sp_platform_exit(void)
228 {
229 platform_driver_unregister(&sp_platform_driver);
230 }
231