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	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
114static 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
178e_err:
179	dev_notice(dev, "initialization failed\n");
180	return ret;
181}
182
183static void 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
193#ifdef CONFIG_PM
194static int sp_platform_suspend(struct platform_device *pdev,
195				pm_message_t state)
196{
197	struct device *dev = &pdev->dev;
198	struct sp_device *sp = dev_get_drvdata(dev);
199
200	return sp_suspend(sp);
201}
202
203static int sp_platform_resume(struct platform_device *pdev)
204{
205	struct device *dev = &pdev->dev;
206	struct sp_device *sp = dev_get_drvdata(dev);
207
208	return sp_resume(sp);
209}
210#endif
211
212static struct platform_driver sp_platform_driver = {
213	.driver = {
214		.name = "ccp",
215#ifdef CONFIG_ACPI
216		.acpi_match_table = sp_acpi_match,
217#endif
218#ifdef CONFIG_OF
219		.of_match_table = sp_of_match,
220#endif
221	},
222	.probe = sp_platform_probe,
223	.remove_new = sp_platform_remove,
224#ifdef CONFIG_PM
225	.suspend = sp_platform_suspend,
226	.resume = sp_platform_resume,
227#endif
228};
229
230int sp_platform_init(void)
231{
232	return platform_driver_register(&sp_platform_driver);
233}
234
235void sp_platform_exit(void)
236{
237	platform_driver_unregister(&sp_platform_driver);
238}