1/*
  2 * AMD Secure Processor device driver
  3 *
  4 * Copyright (C) 2014,2016 Advanced Micro Devices, Inc.
  5 *
  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>
 25#include <linux/of.h>
 26#include <linux/of_address.h>
 27#include <linux/acpi.h>
 28
 29#include "ccp-dev.h"
 30
 31struct sp_platform {
 32	int coherent;
 33	unsigned int irq_count;
 34};
 35
 36static const struct acpi_device_id sp_acpi_match[];
 37static const struct of_device_id sp_of_match[];
 38
 39static struct sp_dev_vdata *sp_get_of_version(struct platform_device *pdev)
 40{
 41#ifdef CONFIG_OF
 42	const struct of_device_id *match;
 43
 44	match = of_match_node(sp_of_match, pdev->dev.of_node);
 45	if (match && match->data)
 46		return (struct sp_dev_vdata *)match->data;
 47#endif
 48	return NULL;
 49}
 50
 51static struct sp_dev_vdata *sp_get_acpi_version(struct platform_device *pdev)
 52{
 53#ifdef CONFIG_ACPI
 54	const struct acpi_device_id *match;
 55
 56	match = acpi_match_device(sp_acpi_match, &pdev->dev);
 57	if (match && match->driver_data)
 58		return (struct sp_dev_vdata *)match->driver_data;
 59#endif
 60	return NULL;
 61}
 62
 63static int sp_get_irqs(struct sp_device *sp)
 64{
 65	struct sp_platform *sp_platform = sp->dev_specific;
 66	struct device *dev = sp->dev;
 67	struct platform_device *pdev = to_platform_device(dev);
 68	unsigned int i, count;
 69	int ret;
 70
 71	for (i = 0, count = 0; i < pdev->num_resources; i++) {
 72		struct resource *res = &pdev->resource[i];
 73
 74		if (resource_type(res) == IORESOURCE_IRQ)
 75			count++;
 76	}
 77
 78	sp_platform->irq_count = count;
 79
 80	ret = platform_get_irq(pdev, 0);
 81	if (ret < 0) {
 82		dev_notice(dev, "unable to get IRQ (%d)\n", ret);
 83		return ret;
 84	}
 85
 86	sp->psp_irq = ret;
 87	if (count == 1) {
 88		sp->ccp_irq = ret;
 89	} else {
 90		ret = platform_get_irq(pdev, 1);
 91		if (ret < 0) {
 92			dev_notice(dev, "unable to get IRQ (%d)\n", ret);
 93			return ret;
 94		}
 95
 96		sp->ccp_irq = ret;
 97	}
 98
 99	return 0;
100}
101
102static int sp_platform_probe(struct platform_device *pdev)
103{
104	struct sp_device *sp;
105	struct sp_platform *sp_platform;
106	struct device *dev = &pdev->dev;
107	enum dev_dma_attr attr;
108	struct resource *ior;
109	int ret;
110
111	ret = -ENOMEM;
112	sp = sp_alloc_struct(dev);
113	if (!sp)
114		goto e_err;
115
116	sp_platform = devm_kzalloc(dev, sizeof(*sp_platform), GFP_KERNEL);
117	if (!sp_platform)
118		goto e_err;
119
120	sp->dev_specific = sp_platform;
121	sp->dev_vdata = pdev->dev.of_node ? sp_get_of_version(pdev)
122					 : sp_get_acpi_version(pdev);
123	if (!sp->dev_vdata) {
124		ret = -ENODEV;
125		dev_err(dev, "missing driver data\n");
126		goto e_err;
127	}
128
129	ior = platform_get_resource(pdev, IORESOURCE_MEM, 0);
130	sp->io_map = devm_ioremap_resource(dev, ior);
131	if (IS_ERR(sp->io_map)) {
132		ret = PTR_ERR(sp->io_map);
133		goto e_err;
134	}
135
136	attr = device_get_dma_attr(dev);
137	if (attr == DEV_DMA_NOT_SUPPORTED) {
138		dev_err(dev, "DMA is not supported");
139		goto e_err;
140	}
141
142	sp_platform->coherent = (attr == DEV_DMA_COHERENT);
143	if (sp_platform->coherent)
144		sp->axcache = CACHE_WB_NO_ALLOC;
145	else
146		sp->axcache = CACHE_NONE;
147
148	ret = dma_set_mask_and_coherent(dev, DMA_BIT_MASK(48));
149	if (ret) {
150		dev_err(dev, "dma_set_mask_and_coherent failed (%d)\n", ret);
151		goto e_err;
152	}
153
154	ret = sp_get_irqs(sp);
155	if (ret)
156		goto e_err;
157
158	dev_set_drvdata(dev, sp);
159
160	ret = sp_init(sp);
161	if (ret)
162		goto e_err;
163
164	dev_notice(dev, "enabled\n");
165
166	return 0;
167
168e_err:
169	dev_notice(dev, "initialization failed\n");
170	return ret;
171}
172
173static int sp_platform_remove(struct platform_device *pdev)
174{
175	struct device *dev = &pdev->dev;
176	struct sp_device *sp = dev_get_drvdata(dev);
177
178	sp_destroy(sp);
179
180	dev_notice(dev, "disabled\n");
181
182	return 0;
183}
184
185#ifdef CONFIG_PM
186static int sp_platform_suspend(struct platform_device *pdev,
187				pm_message_t state)
188{
189	struct device *dev = &pdev->dev;
190	struct sp_device *sp = dev_get_drvdata(dev);
191
192	return sp_suspend(sp, state);
193}
194
195static int sp_platform_resume(struct platform_device *pdev)
196{
197	struct device *dev = &pdev->dev;
198	struct sp_device *sp = dev_get_drvdata(dev);
199
200	return sp_resume(sp);
201}
202#endif
203
204static const struct sp_dev_vdata dev_vdata[] = {
205	{
206		.bar = 0,
207#ifdef CONFIG_CRYPTO_DEV_SP_CCP
208		.ccp_vdata = &ccpv3_platform,
209#endif
210	},
211};
212
213#ifdef CONFIG_ACPI
214static const struct acpi_device_id sp_acpi_match[] = {
215	{ "AMDI0C00", (kernel_ulong_t)&dev_vdata[0] },
216	{ },
217};
218MODULE_DEVICE_TABLE(acpi, sp_acpi_match);
219#endif
220
221#ifdef CONFIG_OF
222static const struct of_device_id sp_of_match[] = {
223	{ .compatible = "amd,ccp-seattle-v1a",
224	  .data = (const void *)&dev_vdata[0] },
225	{ },
226};
227MODULE_DEVICE_TABLE(of, sp_of_match);
228#endif
229
230static struct platform_driver sp_platform_driver = {
231	.driver = {
232		.name = "ccp",
233#ifdef CONFIG_ACPI
234		.acpi_match_table = sp_acpi_match,
235#endif
236#ifdef CONFIG_OF
237		.of_match_table = sp_of_match,
238#endif
239	},
240	.probe = sp_platform_probe,
241	.remove = sp_platform_remove,
242#ifdef CONFIG_PM
243	.suspend = sp_platform_suspend,
244	.resume = sp_platform_resume,
245#endif
246};
247
248int sp_platform_init(void)
249{
250	return platform_driver_register(&sp_platform_driver);
251}
252
253void sp_platform_exit(void)
254{
255	platform_driver_unregister(&sp_platform_driver);
256}