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 #ifdef CONFIG_ACPI
43 static const struct acpi_device_id sp_acpi_match[] = {
44 { "AMDI0C00", (kernel_ulong_t)&dev_vdata[0] },
45 { },
46 };
47 MODULE_DEVICE_TABLE(acpi, sp_acpi_match);
48 #endif
49
50 #ifdef CONFIG_OF
51 static const struct of_device_id sp_of_match[] = {
52 { .compatible = "amd,ccp-seattle-v1a",
53 .data = (const void *)&dev_vdata[0] },
54 { },
55 };
56 MODULE_DEVICE_TABLE(of, sp_of_match);
57 #endif
58
sp_get_of_version(struct platform_device * pdev)59 static struct sp_dev_vdata *sp_get_of_version(struct platform_device *pdev)
60 {
61 #ifdef CONFIG_OF
62 const struct of_device_id *match;
63
64 match = of_match_node(sp_of_match, pdev->dev.of_node);
65 if (match && match->data)
66 return (struct sp_dev_vdata *)match->data;
67 #endif
68 return NULL;
69 }
70
sp_get_acpi_version(struct platform_device * pdev)71 static struct sp_dev_vdata *sp_get_acpi_version(struct platform_device *pdev)
72 {
73 #ifdef CONFIG_ACPI
74 const struct acpi_device_id *match;
75
76 match = acpi_match_device(sp_acpi_match, &pdev->dev);
77 if (match && match->driver_data)
78 return (struct sp_dev_vdata *)match->driver_data;
79 #endif
80 return NULL;
81 }
82
sp_get_irqs(struct sp_device * sp)83 static int sp_get_irqs(struct sp_device *sp)
84 {
85 struct sp_platform *sp_platform = sp->dev_specific;
86 struct device *dev = sp->dev;
87 struct platform_device *pdev = to_platform_device(dev);
88 int ret;
89
90 sp_platform->irq_count = platform_irq_count(pdev);
91
92 ret = platform_get_irq(pdev, 0);
93 if (ret < 0) {
94 dev_notice(dev, "unable to get IRQ (%d)\n", ret);
95 return ret;
96 }
97
98 sp->psp_irq = ret;
99 if (sp_platform->irq_count == 1) {
100 sp->ccp_irq = ret;
101 } else {
102 ret = platform_get_irq(pdev, 1);
103 if (ret < 0) {
104 dev_notice(dev, "unable to get IRQ (%d)\n", ret);
105 return ret;
106 }
107
108 sp->ccp_irq = ret;
109 }
110
111 return 0;
112 }
113
sp_platform_probe(struct platform_device * pdev)114 static int sp_platform_probe(struct platform_device *pdev)
115 {
116 struct sp_device *sp;
117 struct sp_platform *sp_platform;
118 struct device *dev = &pdev->dev;
119 enum dev_dma_attr attr;
120 int ret;
121
122 ret = -ENOMEM;
123 sp = sp_alloc_struct(dev);
124 if (!sp)
125 goto e_err;
126
127 sp_platform = devm_kzalloc(dev, sizeof(*sp_platform), GFP_KERNEL);
128 if (!sp_platform)
129 goto e_err;
130
131 sp->dev_specific = sp_platform;
132 sp->dev_vdata = pdev->dev.of_node ? sp_get_of_version(pdev)
133 : sp_get_acpi_version(pdev);
134 if (!sp->dev_vdata) {
135 ret = -ENODEV;
136 dev_err(dev, "missing driver data\n");
137 goto e_err;
138 }
139
140 sp->io_map = devm_platform_ioremap_resource(pdev, 0);
141 if (IS_ERR(sp->io_map)) {
142 ret = PTR_ERR(sp->io_map);
143 goto e_err;
144 }
145
146 attr = device_get_dma_attr(dev);
147 if (attr == DEV_DMA_NOT_SUPPORTED) {
148 dev_err(dev, "DMA is not supported");
149 goto e_err;
150 }
151
152 sp_platform->coherent = (attr == DEV_DMA_COHERENT);
153 if (sp_platform->coherent)
154 sp->axcache = CACHE_WB_NO_ALLOC;
155 else
156 sp->axcache = CACHE_NONE;
157
158 ret = dma_set_mask_and_coherent(dev, DMA_BIT_MASK(48));
159 if (ret) {
160 dev_err(dev, "dma_set_mask_and_coherent failed (%d)\n", ret);
161 goto e_err;
162 }
163
164 ret = sp_get_irqs(sp);
165 if (ret)
166 goto e_err;
167
168 dev_set_drvdata(dev, sp);
169
170 ret = sp_init(sp);
171 if (ret)
172 goto e_err;
173
174 dev_notice(dev, "enabled\n");
175
176 return 0;
177
178 e_err:
179 dev_notice(dev, "initialization failed\n");
180 return ret;
181 }
182
sp_platform_remove(struct platform_device * pdev)183 static int sp_platform_remove(struct platform_device *pdev)
184 {
185 struct device *dev = &pdev->dev;
186 struct sp_device *sp = dev_get_drvdata(dev);
187
188 sp_destroy(sp);
189
190 dev_notice(dev, "disabled\n");
191
192 return 0;
193 }
194
195 #ifdef CONFIG_PM
sp_platform_suspend(struct platform_device * pdev,pm_message_t state)196 static int sp_platform_suspend(struct platform_device *pdev,
197 pm_message_t state)
198 {
199 struct device *dev = &pdev->dev;
200 struct sp_device *sp = dev_get_drvdata(dev);
201
202 return sp_suspend(sp);
203 }
204
sp_platform_resume(struct platform_device * pdev)205 static int sp_platform_resume(struct platform_device *pdev)
206 {
207 struct device *dev = &pdev->dev;
208 struct sp_device *sp = dev_get_drvdata(dev);
209
210 return sp_resume(sp);
211 }
212 #endif
213
214 static struct platform_driver sp_platform_driver = {
215 .driver = {
216 .name = "ccp",
217 #ifdef CONFIG_ACPI
218 .acpi_match_table = sp_acpi_match,
219 #endif
220 #ifdef CONFIG_OF
221 .of_match_table = sp_of_match,
222 #endif
223 },
224 .probe = sp_platform_probe,
225 .remove = sp_platform_remove,
226 #ifdef CONFIG_PM
227 .suspend = sp_platform_suspend,
228 .resume = sp_platform_resume,
229 #endif
230 };
231
sp_platform_init(void)232 int sp_platform_init(void)
233 {
234 return platform_driver_register(&sp_platform_driver);
235 }
236
sp_platform_exit(void)237 void sp_platform_exit(void)
238 {
239 platform_driver_unregister(&sp_platform_driver);
240 }
241