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Tom Lendackyc4f4b322014-06-05 10:17:57 -05001/*
2 * AMD Cryptographic Coprocessor (CCP) driver
3 *
Gary R Hook553d2372016-03-01 13:49:04 -06004 * Copyright (C) 2014,2016 Advanced Micro Devices, Inc.
Tom Lendackyc4f4b322014-06-05 10:17:57 -05005 *
6 * Author: Tom Lendacky <thomas.lendacky@amd.com>
7 *
8 * This program is free software; you can redistribute it and/or modify
9 * it under the terms of the GNU General Public License version 2 as
10 * published by the Free Software Foundation.
11 */
12
13#include <linux/module.h>
14#include <linux/kernel.h>
15#include <linux/device.h>
16#include <linux/platform_device.h>
17#include <linux/ioport.h>
18#include <linux/dma-mapping.h>
19#include <linux/kthread.h>
20#include <linux/sched.h>
21#include <linux/interrupt.h>
22#include <linux/spinlock.h>
23#include <linux/delay.h>
24#include <linux/ccp.h>
Tom Lendacky126ae9a2014-07-10 10:58:35 -050025#include <linux/of.h>
Tom Lendacky6c506342015-02-03 13:07:29 -060026#include <linux/of_address.h>
27#include <linux/acpi.h>
Tom Lendackyc4f4b322014-06-05 10:17:57 -050028
29#include "ccp-dev.h"
30
Tom Lendacky6c506342015-02-03 13:07:29 -060031struct ccp_platform {
Tom Lendacky6c506342015-02-03 13:07:29 -060032 int coherent;
33};
34
Gary R Hookc7019c42016-03-01 13:49:15 -060035static const struct acpi_device_id ccp_acpi_match[];
36static const struct of_device_id ccp_of_match[];
37
38static struct ccp_vdata *ccp_get_of_version(struct platform_device *pdev)
39{
40#ifdef CONFIG_OF
41 const struct of_device_id *match;
42
43 match = of_match_node(ccp_of_match, pdev->dev.of_node);
44 if (match && match->data)
45 return (struct ccp_vdata *)match->data;
46#endif
pjambhlekar9d1fb192017-05-03 09:32:09 +053047 return NULL;
Gary R Hookc7019c42016-03-01 13:49:15 -060048}
49
50static struct ccp_vdata *ccp_get_acpi_version(struct platform_device *pdev)
51{
52#ifdef CONFIG_ACPI
53 const struct acpi_device_id *match;
54
55 match = acpi_match_device(ccp_acpi_match, &pdev->dev);
56 if (match && match->driver_data)
57 return (struct ccp_vdata *)match->driver_data;
58#endif
pjambhlekar9d1fb192017-05-03 09:32:09 +053059 return NULL;
Gary R Hookc7019c42016-03-01 13:49:15 -060060}
61
Tom Lendackyc4f4b322014-06-05 10:17:57 -050062static int ccp_get_irq(struct ccp_device *ccp)
63{
64 struct device *dev = ccp->dev;
Geliang Tangc6c59bf2015-12-23 20:49:01 +080065 struct platform_device *pdev = to_platform_device(dev);
Tom Lendackyc4f4b322014-06-05 10:17:57 -050066 int ret;
67
68 ret = platform_get_irq(pdev, 0);
Gustavo A. R. Silva28a2cc62017-06-30 00:59:52 -050069 if (ret < 0) {
70 dev_notice(dev, "unable to get IRQ (%d)\n", ret);
Tom Lendackyc4f4b322014-06-05 10:17:57 -050071 return ret;
Gustavo A. R. Silva28a2cc62017-06-30 00:59:52 -050072 }
Tom Lendackyc4f4b322014-06-05 10:17:57 -050073
74 ccp->irq = ret;
Gary R Hookea0375a2016-03-01 13:49:25 -060075 ret = request_irq(ccp->irq, ccp->vdata->perform->irqhandler, 0,
76 ccp->name, dev);
Tom Lendackyc4f4b322014-06-05 10:17:57 -050077 if (ret) {
78 dev_notice(dev, "unable to allocate IRQ (%d)\n", ret);
79 return ret;
80 }
81
82 return 0;
83}
84
85static int ccp_get_irqs(struct ccp_device *ccp)
86{
87 struct device *dev = ccp->dev;
88 int ret;
89
90 ret = ccp_get_irq(ccp);
91 if (!ret)
92 return 0;
93
94 /* Couldn't get an interrupt */
95 dev_notice(dev, "could not enable interrupts (%d)\n", ret);
96
97 return ret;
98}
99
100static void ccp_free_irqs(struct ccp_device *ccp)
101{
102 struct device *dev = ccp->dev;
103
104 free_irq(ccp->irq, dev);
105}
106
Tom Lendackyc4f4b322014-06-05 10:17:57 -0500107static int ccp_platform_probe(struct platform_device *pdev)
108{
109 struct ccp_device *ccp;
Tom Lendacky6c506342015-02-03 13:07:29 -0600110 struct ccp_platform *ccp_platform;
Tom Lendackyc4f4b322014-06-05 10:17:57 -0500111 struct device *dev = &pdev->dev;
Suthikulpanit, Suravee1831eff2015-10-28 15:50:50 -0700112 enum dev_dma_attr attr;
Tom Lendackyc4f4b322014-06-05 10:17:57 -0500113 struct resource *ior;
114 int ret;
115
116 ret = -ENOMEM;
117 ccp = ccp_alloc_struct(dev);
118 if (!ccp)
119 goto e_err;
120
Tom Lendacky6c506342015-02-03 13:07:29 -0600121 ccp_platform = devm_kzalloc(dev, sizeof(*ccp_platform), GFP_KERNEL);
122 if (!ccp_platform)
123 goto e_err;
124
125 ccp->dev_specific = ccp_platform;
Gary R Hookc7019c42016-03-01 13:49:15 -0600126 ccp->vdata = pdev->dev.of_node ? ccp_get_of_version(pdev)
127 : ccp_get_acpi_version(pdev);
128 if (!ccp->vdata || !ccp->vdata->version) {
129 ret = -ENODEV;
130 dev_err(dev, "missing driver data\n");
131 goto e_err;
132 }
Tom Lendackyc4f4b322014-06-05 10:17:57 -0500133 ccp->get_irq = ccp_get_irqs;
134 ccp->free_irq = ccp_free_irqs;
135
Brijesh Singh970e8302017-07-06 09:59:13 -0500136 ior = platform_get_resource(pdev, IORESOURCE_MEM, 0);
Tom Lendackyc4f4b322014-06-05 10:17:57 -0500137 ccp->io_map = devm_ioremap_resource(dev, ior);
138 if (IS_ERR(ccp->io_map)) {
139 ret = PTR_ERR(ccp->io_map);
Tom Lendackybe03a3a2015-02-03 13:07:23 -0600140 goto e_err;
Tom Lendackyc4f4b322014-06-05 10:17:57 -0500141 }
142 ccp->io_regs = ccp->io_map;
143
Suthikulpanit, Suravee1831eff2015-10-28 15:50:50 -0700144 attr = device_get_dma_attr(dev);
145 if (attr == DEV_DMA_NOT_SUPPORTED) {
146 dev_err(dev, "DMA is not supported");
147 goto e_err;
148 }
149
150 ccp_platform->coherent = (attr == DEV_DMA_COHERENT);
151 if (ccp_platform->coherent)
152 ccp->axcache = CACHE_WB_NO_ALLOC;
153 else
154 ccp->axcache = CACHE_NONE;
155
Tom Lendacky261bf072015-02-03 13:07:17 -0600156 ret = dma_set_mask_and_coherent(dev, DMA_BIT_MASK(48));
157 if (ret) {
158 dev_err(dev, "dma_set_mask_and_coherent failed (%d)\n", ret);
Tom Lendackybe03a3a2015-02-03 13:07:23 -0600159 goto e_err;
Tom Lendacky261bf072015-02-03 13:07:17 -0600160 }
Tom Lendackyc4f4b322014-06-05 10:17:57 -0500161
Tom Lendackyc4f4b322014-06-05 10:17:57 -0500162 dev_set_drvdata(dev, ccp);
163
Brijesh Singh970e8302017-07-06 09:59:13 -0500164 ret = ccp_dev_init(ccp);
Tom Lendackyc4f4b322014-06-05 10:17:57 -0500165 if (ret)
Tom Lendackybe03a3a2015-02-03 13:07:23 -0600166 goto e_err;
Tom Lendackyc4f4b322014-06-05 10:17:57 -0500167
168 dev_notice(dev, "enabled\n");
169
170 return 0;
171
Tom Lendackyc4f4b322014-06-05 10:17:57 -0500172e_err:
173 dev_notice(dev, "initialization failed\n");
174 return ret;
175}
176
177static int ccp_platform_remove(struct platform_device *pdev)
178{
179 struct device *dev = &pdev->dev;
180 struct ccp_device *ccp = dev_get_drvdata(dev);
181
Brijesh Singh970e8302017-07-06 09:59:13 -0500182 ccp_dev_destroy(ccp);
Tom Lendackyc4f4b322014-06-05 10:17:57 -0500183
Tom Lendackyc4f4b322014-06-05 10:17:57 -0500184 dev_notice(dev, "disabled\n");
185
186 return 0;
187}
188
189#ifdef CONFIG_PM
190static int ccp_platform_suspend(struct platform_device *pdev,
191 pm_message_t state)
192{
193 struct device *dev = &pdev->dev;
194 struct ccp_device *ccp = dev_get_drvdata(dev);
Tom Lendackyc4f4b322014-06-05 10:17:57 -0500195
Brijesh Singh970e8302017-07-06 09:59:13 -0500196 return ccp_dev_suspend(ccp, state);
Tom Lendackyc4f4b322014-06-05 10:17:57 -0500197}
198
199static int ccp_platform_resume(struct platform_device *pdev)
200{
201 struct device *dev = &pdev->dev;
202 struct ccp_device *ccp = dev_get_drvdata(dev);
Tom Lendackyc4f4b322014-06-05 10:17:57 -0500203
Brijesh Singh970e8302017-07-06 09:59:13 -0500204 return ccp_dev_resume(ccp);
Tom Lendackyc4f4b322014-06-05 10:17:57 -0500205}
206#endif
207
Tom Lendacky6c506342015-02-03 13:07:29 -0600208#ifdef CONFIG_ACPI
209static const struct acpi_device_id ccp_acpi_match[] = {
Gary R Hookc7019c42016-03-01 13:49:15 -0600210 { "AMDI0C00", (kernel_ulong_t)&ccpv3 },
Tom Lendacky6c506342015-02-03 13:07:29 -0600211 { },
212};
Tom Lendacky61705112015-06-30 12:57:14 -0500213MODULE_DEVICE_TABLE(acpi, ccp_acpi_match);
Tom Lendacky6c506342015-02-03 13:07:29 -0600214#endif
215
216#ifdef CONFIG_OF
217static const struct of_device_id ccp_of_match[] = {
Gary R Hookc7019c42016-03-01 13:49:15 -0600218 { .compatible = "amd,ccp-seattle-v1a",
Brijesh Singh970e8302017-07-06 09:59:13 -0500219 .data = (const void *)&ccpv3_platform },
Tom Lendackyc4f4b322014-06-05 10:17:57 -0500220 { },
221};
Tom Lendacky61705112015-06-30 12:57:14 -0500222MODULE_DEVICE_TABLE(of, ccp_of_match);
Tom Lendacky6c506342015-02-03 13:07:29 -0600223#endif
Tom Lendackyc4f4b322014-06-05 10:17:57 -0500224
225static struct platform_driver ccp_platform_driver = {
226 .driver = {
Tom Lendacky166db192015-10-01 16:32:50 -0500227 .name = "ccp",
Tom Lendacky6c506342015-02-03 13:07:29 -0600228#ifdef CONFIG_ACPI
229 .acpi_match_table = ccp_acpi_match,
230#endif
231#ifdef CONFIG_OF
232 .of_match_table = ccp_of_match,
233#endif
Tom Lendackyc4f4b322014-06-05 10:17:57 -0500234 },
235 .probe = ccp_platform_probe,
236 .remove = ccp_platform_remove,
237#ifdef CONFIG_PM
238 .suspend = ccp_platform_suspend,
239 .resume = ccp_platform_resume,
240#endif
241};
242
243int ccp_platform_init(void)
244{
245 return platform_driver_register(&ccp_platform_driver);
246}
247
248void ccp_platform_exit(void)
249{
250 platform_driver_unregister(&ccp_platform_driver);
251}