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}