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