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
28struct sp_platform {
29	int coherent;
30	unsigned int irq_count;
31};
32
33static 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
43static const struct acpi_device_id sp_acpi_match[] = {
44	{ "AMDI0C00", (kernel_ulong_t)&dev_vdata[0] },
45	{ },
46};
47MODULE_DEVICE_TABLE(acpi, sp_acpi_match);
48#endif
49
50#ifdef CONFIG_OF
51static const struct of_device_id sp_of_match[] = {
52	{ .compatible = "amd,ccp-seattle-v1a",
53	  .data = (const void *)&dev_vdata[0] },
54	{ },
55};
56MODULE_DEVICE_TABLE(of, sp_of_match);
57#endif
58
59static 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
71static 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
83static 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	unsigned int i, count;
89	int ret;
90
91	for (i = 0, count = 0; i < pdev->num_resources; i++) {
92		struct resource *res = &pdev->resource[i];
93
94		if (resource_type(res) == IORESOURCE_IRQ)
95			count++;
96	}
97
98	sp_platform->irq_count = count;
99
100	ret = platform_get_irq(pdev, 0);
101	if (ret < 0) {
102		dev_notice(dev, "unable to get IRQ (%d)\n", ret);
103		return ret;
104	}
105
106	sp->psp_irq = ret;
107	if (count == 1) {
108		sp->ccp_irq = ret;
109	} else {
110		ret = platform_get_irq(pdev, 1);
111		if (ret < 0) {
112			dev_notice(dev, "unable to get IRQ (%d)\n", ret);
113			return ret;
114		}
115
116		sp->ccp_irq = ret;
117	}
118
119	return 0;
120}
121
122static int sp_platform_probe(struct platform_device *pdev)
123{
124	struct sp_device *sp;
125	struct sp_platform *sp_platform;
126	struct device *dev = &pdev->dev;
127	enum dev_dma_attr attr;
128	int ret;
129
130	ret = -ENOMEM;
131	sp = sp_alloc_struct(dev);
132	if (!sp)
133		goto e_err;
134
135	sp_platform = devm_kzalloc(dev, sizeof(*sp_platform), GFP_KERNEL);
136	if (!sp_platform)
137		goto e_err;
138
139	sp->dev_specific = sp_platform;
140	sp->dev_vdata = pdev->dev.of_node ? sp_get_of_version(pdev)
141					 : sp_get_acpi_version(pdev);
142	if (!sp->dev_vdata) {
143		ret = -ENODEV;
144		dev_err(dev, "missing driver data\n");
145		goto e_err;
146	}
147
148	sp->io_map = devm_platform_ioremap_resource(pdev, 0);
149	if (IS_ERR(sp->io_map)) {
150		ret = PTR_ERR(sp->io_map);
151		goto e_err;
152	}
153
154	attr = device_get_dma_attr(dev);
155	if (attr == DEV_DMA_NOT_SUPPORTED) {
156		dev_err(dev, "DMA is not supported");
157		goto e_err;
158	}
159
160	sp_platform->coherent = (attr == DEV_DMA_COHERENT);
161	if (sp_platform->coherent)
162		sp->axcache = CACHE_WB_NO_ALLOC;
163	else
164		sp->axcache = CACHE_NONE;
165
166	ret = dma_set_mask_and_coherent(dev, DMA_BIT_MASK(48));
167	if (ret) {
168		dev_err(dev, "dma_set_mask_and_coherent failed (%d)\n", ret);
169		goto e_err;
170	}
171
172	ret = sp_get_irqs(sp);
173	if (ret)
174		goto e_err;
175
176	dev_set_drvdata(dev, sp);
177
178	ret = sp_init(sp);
179	if (ret)
180		goto e_err;
181
182	dev_notice(dev, "enabled\n");
183
184	return 0;
185
186e_err:
187	dev_notice(dev, "initialization failed\n");
188	return ret;
189}
190
191static int sp_platform_remove(struct platform_device *pdev)
192{
193	struct device *dev = &pdev->dev;
194	struct sp_device *sp = dev_get_drvdata(dev);
195
196	sp_destroy(sp);
197
198	dev_notice(dev, "disabled\n");
199
200	return 0;
201}
202
203#ifdef CONFIG_PM
204static int sp_platform_suspend(struct platform_device *pdev,
205				pm_message_t state)
206{
207	struct device *dev = &pdev->dev;
208	struct sp_device *sp = dev_get_drvdata(dev);
209
210	return sp_suspend(sp);
211}
212
213static int sp_platform_resume(struct platform_device *pdev)
214{
215	struct device *dev = &pdev->dev;
216	struct sp_device *sp = dev_get_drvdata(dev);
217
218	return sp_resume(sp);
219}
220#endif
221
222static struct platform_driver sp_platform_driver = {
223	.driver = {
224		.name = "ccp",
225#ifdef CONFIG_ACPI
226		.acpi_match_table = sp_acpi_match,
227#endif
228#ifdef CONFIG_OF
229		.of_match_table = sp_of_match,
230#endif
231	},
232	.probe = sp_platform_probe,
233	.remove = sp_platform_remove,
234#ifdef CONFIG_PM
235	.suspend = sp_platform_suspend,
236	.resume = sp_platform_resume,
237#endif
238};
239
240int sp_platform_init(void)
241{
242	return platform_driver_register(&sp_platform_driver);
243}
244
245void sp_platform_exit(void)
246{
247	platform_driver_unregister(&sp_platform_driver);
248}
249