1// SPDX-License-Identifier: GPL-2.0-only
2/*
3 * AMD Secure Processor device driver
4 *
5 * Copyright (C) 2013,2019 Advanced Micro Devices, Inc.
6 *
7 * Author: Tom Lendacky <thomas.lendacky@amd.com>
8 * Author: Gary R Hook <gary.hook@amd.com>
9 */
10
11#include <linux/module.h>
12#include <linux/kernel.h>
13#include <linux/device.h>
14#include <linux/pci.h>
15#include <linux/pci_ids.h>
16#include <linux/dma-mapping.h>
17#include <linux/kthread.h>
18#include <linux/sched.h>
19#include <linux/interrupt.h>
20#include <linux/spinlock.h>
21#include <linux/delay.h>
22#include <linux/ccp.h>
23
24#include "ccp-dev.h"
25#include "psp-dev.h"
26
27#define MSIX_VECTORS			2
28
29struct sp_pci {
30	int msix_count;
31	struct msix_entry msix_entry[MSIX_VECTORS];
32};
33static struct sp_device *sp_dev_master;
34
35static int sp_get_msix_irqs(struct sp_device *sp)
36{
37	struct sp_pci *sp_pci = sp->dev_specific;
38	struct device *dev = sp->dev;
39	struct pci_dev *pdev = to_pci_dev(dev);
40	int v, ret;
41
42	for (v = 0; v < ARRAY_SIZE(sp_pci->msix_entry); v++)
43		sp_pci->msix_entry[v].entry = v;
44
45	ret = pci_enable_msix_range(pdev, sp_pci->msix_entry, 1, v);
46	if (ret < 0)
47		return ret;
48
49	sp_pci->msix_count = ret;
50	sp->use_tasklet = true;
51
52	sp->psp_irq = sp_pci->msix_entry[0].vector;
53	sp->ccp_irq = (sp_pci->msix_count > 1) ? sp_pci->msix_entry[1].vector
54					       : sp_pci->msix_entry[0].vector;
55	return 0;
56}
57
58static int sp_get_msi_irq(struct sp_device *sp)
59{
60	struct device *dev = sp->dev;
61	struct pci_dev *pdev = to_pci_dev(dev);
62	int ret;
63
64	ret = pci_enable_msi(pdev);
65	if (ret)
66		return ret;
67
68	sp->ccp_irq = pdev->irq;
69	sp->psp_irq = pdev->irq;
70
71	return 0;
72}
73
74static int sp_get_irqs(struct sp_device *sp)
75{
76	struct device *dev = sp->dev;
77	int ret;
78
79	ret = sp_get_msix_irqs(sp);
80	if (!ret)
81		return 0;
82
83	/* Couldn't get MSI-X vectors, try MSI */
84	dev_notice(dev, "could not enable MSI-X (%d), trying MSI\n", ret);
85	ret = sp_get_msi_irq(sp);
86	if (!ret)
87		return 0;
88
89	/* Couldn't get MSI interrupt */
90	dev_notice(dev, "could not enable MSI (%d)\n", ret);
91
92	return ret;
93}
94
95static void sp_free_irqs(struct sp_device *sp)
96{
97	struct sp_pci *sp_pci = sp->dev_specific;
98	struct device *dev = sp->dev;
99	struct pci_dev *pdev = to_pci_dev(dev);
100
101	if (sp_pci->msix_count)
102		pci_disable_msix(pdev);
103	else if (sp->psp_irq)
104		pci_disable_msi(pdev);
105
106	sp->ccp_irq = 0;
107	sp->psp_irq = 0;
108}
109
110static bool sp_pci_is_master(struct sp_device *sp)
111{
112	struct device *dev_cur, *dev_new;
113	struct pci_dev *pdev_cur, *pdev_new;
114
115	dev_new = sp->dev;
116	dev_cur = sp_dev_master->dev;
117
118	pdev_new = to_pci_dev(dev_new);
119	pdev_cur = to_pci_dev(dev_cur);
120
121	if (pdev_new->bus->number < pdev_cur->bus->number)
122		return true;
123
124	if (PCI_SLOT(pdev_new->devfn) < PCI_SLOT(pdev_cur->devfn))
125		return true;
126
127	if (PCI_FUNC(pdev_new->devfn) < PCI_FUNC(pdev_cur->devfn))
128		return true;
129
130	return false;
131}
132
133static void psp_set_master(struct sp_device *sp)
134{
135	if (!sp_dev_master) {
136		sp_dev_master = sp;
137		return;
138	}
139
140	if (sp_pci_is_master(sp))
141		sp_dev_master = sp;
142}
143
144static struct sp_device *psp_get_master(void)
145{
146	return sp_dev_master;
147}
148
149static void psp_clear_master(struct sp_device *sp)
150{
151	if (sp == sp_dev_master) {
152		sp_dev_master = NULL;
153		dev_dbg(sp->dev, "Cleared sp_dev_master\n");
154	}
155}
156
157static int sp_pci_probe(struct pci_dev *pdev, const struct pci_device_id *id)
158{
159	struct sp_device *sp;
160	struct sp_pci *sp_pci;
161	struct device *dev = &pdev->dev;
162	void __iomem * const *iomap_table;
163	int bar_mask;
164	int ret;
165
166	ret = -ENOMEM;
167	sp = sp_alloc_struct(dev);
168	if (!sp)
169		goto e_err;
170
171	sp_pci = devm_kzalloc(dev, sizeof(*sp_pci), GFP_KERNEL);
172	if (!sp_pci)
173		goto e_err;
174
175	sp->dev_specific = sp_pci;
176	sp->dev_vdata = (struct sp_dev_vdata *)id->driver_data;
177	if (!sp->dev_vdata) {
178		ret = -ENODEV;
179		dev_err(dev, "missing driver data\n");
180		goto e_err;
181	}
182
183	ret = pcim_enable_device(pdev);
184	if (ret) {
185		dev_err(dev, "pcim_enable_device failed (%d)\n", ret);
186		goto e_err;
187	}
188
189	bar_mask = pci_select_bars(pdev, IORESOURCE_MEM);
190	ret = pcim_iomap_regions(pdev, bar_mask, "ccp");
191	if (ret) {
192		dev_err(dev, "pcim_iomap_regions failed (%d)\n", ret);
193		goto e_err;
194	}
195
196	iomap_table = pcim_iomap_table(pdev);
197	if (!iomap_table) {
198		dev_err(dev, "pcim_iomap_table failed\n");
199		ret = -ENOMEM;
200		goto e_err;
201	}
202
203	sp->io_map = iomap_table[sp->dev_vdata->bar];
204	if (!sp->io_map) {
205		dev_err(dev, "ioremap failed\n");
206		ret = -ENOMEM;
207		goto e_err;
208	}
209
210	ret = sp_get_irqs(sp);
211	if (ret)
212		goto e_err;
213
214	pci_set_master(pdev);
215	sp->set_psp_master_device = psp_set_master;
216	sp->get_psp_master_device = psp_get_master;
217	sp->clear_psp_master_device = psp_clear_master;
218
219	ret = dma_set_mask_and_coherent(dev, DMA_BIT_MASK(48));
220	if (ret) {
221		ret = dma_set_mask_and_coherent(dev, DMA_BIT_MASK(32));
222		if (ret) {
223			dev_err(dev, "dma_set_mask_and_coherent failed (%d)\n",
224				ret);
225			goto free_irqs;
226		}
227	}
228
229	dev_set_drvdata(dev, sp);
230
231	ret = sp_init(sp);
232	if (ret)
233		goto free_irqs;
234
235	return 0;
236
237free_irqs:
238	sp_free_irqs(sp);
239e_err:
240	dev_notice(dev, "initialization failed\n");
241	return ret;
242}
243
244static void sp_pci_shutdown(struct pci_dev *pdev)
245{
246	struct device *dev = &pdev->dev;
247	struct sp_device *sp = dev_get_drvdata(dev);
248
249	if (!sp)
250		return;
251
252	sp_destroy(sp);
253}
254
255static void sp_pci_remove(struct pci_dev *pdev)
256{
257	struct device *dev = &pdev->dev;
258	struct sp_device *sp = dev_get_drvdata(dev);
259
260	if (!sp)
261		return;
262
263	sp_destroy(sp);
264
265	sp_free_irqs(sp);
266}
267
268static int __maybe_unused sp_pci_suspend(struct device *dev)
269{
270	struct sp_device *sp = dev_get_drvdata(dev);
271
272	return sp_suspend(sp);
273}
274
275static int __maybe_unused sp_pci_resume(struct device *dev)
276{
277	struct sp_device *sp = dev_get_drvdata(dev);
278
279	return sp_resume(sp);
280}
281
282#ifdef CONFIG_CRYPTO_DEV_SP_PSP
283static const struct sev_vdata sevv1 = {
284	.cmdresp_reg		= 0x10580,
285	.cmdbuff_addr_lo_reg	= 0x105e0,
286	.cmdbuff_addr_hi_reg	= 0x105e4,
287};
288
289static const struct sev_vdata sevv2 = {
290	.cmdresp_reg		= 0x10980,
291	.cmdbuff_addr_lo_reg	= 0x109e0,
292	.cmdbuff_addr_hi_reg	= 0x109e4,
293};
294
295static const struct tee_vdata teev1 = {
296	.cmdresp_reg		= 0x10544,
297	.cmdbuff_addr_lo_reg	= 0x10548,
298	.cmdbuff_addr_hi_reg	= 0x1054c,
299	.ring_wptr_reg          = 0x10550,
300	.ring_rptr_reg          = 0x10554,
301};
302
303static const struct psp_vdata pspv1 = {
304	.sev			= &sevv1,
305	.feature_reg		= 0x105fc,
306	.inten_reg		= 0x10610,
307	.intsts_reg		= 0x10614,
308};
309
310static const struct psp_vdata pspv2 = {
311	.sev			= &sevv2,
312	.feature_reg		= 0x109fc,
313	.inten_reg		= 0x10690,
314	.intsts_reg		= 0x10694,
315};
316
317static const struct psp_vdata pspv3 = {
318	.tee			= &teev1,
319	.feature_reg		= 0x109fc,
320	.inten_reg		= 0x10690,
321	.intsts_reg		= 0x10694,
322};
323#endif
324
325static const struct sp_dev_vdata dev_vdata[] = {
326	{	/* 0 */
327		.bar = 2,
328#ifdef CONFIG_CRYPTO_DEV_SP_CCP
329		.ccp_vdata = &ccpv3,
330#endif
331	},
332	{	/* 1 */
333		.bar = 2,
334#ifdef CONFIG_CRYPTO_DEV_SP_CCP
335		.ccp_vdata = &ccpv5a,
336#endif
337#ifdef CONFIG_CRYPTO_DEV_SP_PSP
338		.psp_vdata = &pspv1,
339#endif
340	},
341	{	/* 2 */
342		.bar = 2,
343#ifdef CONFIG_CRYPTO_DEV_SP_CCP
344		.ccp_vdata = &ccpv5b,
345#endif
346	},
347	{	/* 3 */
348		.bar = 2,
349#ifdef CONFIG_CRYPTO_DEV_SP_CCP
350		.ccp_vdata = &ccpv5a,
351#endif
352#ifdef CONFIG_CRYPTO_DEV_SP_PSP
353		.psp_vdata = &pspv2,
354#endif
355	},
356	{	/* 4 */
357		.bar = 2,
358#ifdef CONFIG_CRYPTO_DEV_SP_CCP
359		.ccp_vdata = &ccpv5a,
360#endif
361#ifdef CONFIG_CRYPTO_DEV_SP_PSP
362		.psp_vdata = &pspv3,
363#endif
364	},
365};
366static const struct pci_device_id sp_pci_table[] = {
367	{ PCI_VDEVICE(AMD, 0x1537), (kernel_ulong_t)&dev_vdata[0] },
368	{ PCI_VDEVICE(AMD, 0x1456), (kernel_ulong_t)&dev_vdata[1] },
369	{ PCI_VDEVICE(AMD, 0x1468), (kernel_ulong_t)&dev_vdata[2] },
370	{ PCI_VDEVICE(AMD, 0x1486), (kernel_ulong_t)&dev_vdata[3] },
371	{ PCI_VDEVICE(AMD, 0x15DF), (kernel_ulong_t)&dev_vdata[4] },
372	/* Last entry must be zero */
373	{ 0, }
374};
375MODULE_DEVICE_TABLE(pci, sp_pci_table);
376
377static SIMPLE_DEV_PM_OPS(sp_pci_pm_ops, sp_pci_suspend, sp_pci_resume);
378
379static struct pci_driver sp_pci_driver = {
380	.name = "ccp",
381	.id_table = sp_pci_table,
382	.probe = sp_pci_probe,
383	.remove = sp_pci_remove,
384	.shutdown = sp_pci_shutdown,
385	.driver.pm = &sp_pci_pm_ops,
386};
387
388int sp_pci_init(void)
389{
390	return pci_register_driver(&sp_pci_driver);
391}
392
393void sp_pci_exit(void)
394{
395	pci_unregister_driver(&sp_pci_driver);
396}
397