1 // SPDX-License-Identifier: GPL-2.0-only
2 /*
3 * AMD Secure Processor device driver
4 *
5 * Copyright (C) 2013,2018 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
29 struct sp_pci {
30 int msix_count;
31 struct msix_entry msix_entry[MSIX_VECTORS];
32 };
33 static struct sp_device *sp_dev_master;
34
sp_get_msix_irqs(struct sp_device * sp)35 static 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
sp_get_msi_irq(struct sp_device * sp)58 static 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
sp_get_irqs(struct sp_device * sp)74 static 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
sp_free_irqs(struct sp_device * sp)95 static 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
sp_pci_is_master(struct sp_device * sp)110 static 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
psp_set_master(struct sp_device * sp)133 static 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
psp_get_master(void)144 static struct sp_device *psp_get_master(void)
145 {
146 return sp_dev_master;
147 }
148
sp_pci_probe(struct pci_dev * pdev,const struct pci_device_id * id)149 static int sp_pci_probe(struct pci_dev *pdev, const struct pci_device_id *id)
150 {
151 struct sp_device *sp;
152 struct sp_pci *sp_pci;
153 struct device *dev = &pdev->dev;
154 void __iomem * const *iomap_table;
155 int bar_mask;
156 int ret;
157
158 ret = -ENOMEM;
159 sp = sp_alloc_struct(dev);
160 if (!sp)
161 goto e_err;
162
163 sp_pci = devm_kzalloc(dev, sizeof(*sp_pci), GFP_KERNEL);
164 if (!sp_pci)
165 goto e_err;
166
167 sp->dev_specific = sp_pci;
168 sp->dev_vdata = (struct sp_dev_vdata *)id->driver_data;
169 if (!sp->dev_vdata) {
170 ret = -ENODEV;
171 dev_err(dev, "missing driver data\n");
172 goto e_err;
173 }
174
175 ret = pcim_enable_device(pdev);
176 if (ret) {
177 dev_err(dev, "pcim_enable_device failed (%d)\n", ret);
178 goto e_err;
179 }
180
181 bar_mask = pci_select_bars(pdev, IORESOURCE_MEM);
182 ret = pcim_iomap_regions(pdev, bar_mask, "ccp");
183 if (ret) {
184 dev_err(dev, "pcim_iomap_regions failed (%d)\n", ret);
185 goto e_err;
186 }
187
188 iomap_table = pcim_iomap_table(pdev);
189 if (!iomap_table) {
190 dev_err(dev, "pcim_iomap_table failed\n");
191 ret = -ENOMEM;
192 goto e_err;
193 }
194
195 sp->io_map = iomap_table[sp->dev_vdata->bar];
196 if (!sp->io_map) {
197 dev_err(dev, "ioremap failed\n");
198 ret = -ENOMEM;
199 goto e_err;
200 }
201
202 ret = sp_get_irqs(sp);
203 if (ret)
204 goto e_err;
205
206 pci_set_master(pdev);
207 sp->set_psp_master_device = psp_set_master;
208 sp->get_psp_master_device = psp_get_master;
209
210 ret = dma_set_mask_and_coherent(dev, DMA_BIT_MASK(48));
211 if (ret) {
212 ret = dma_set_mask_and_coherent(dev, DMA_BIT_MASK(32));
213 if (ret) {
214 dev_err(dev, "dma_set_mask_and_coherent failed (%d)\n",
215 ret);
216 goto e_err;
217 }
218 }
219
220 dev_set_drvdata(dev, sp);
221
222 ret = sp_init(sp);
223 if (ret)
224 goto e_err;
225
226 return 0;
227
228 e_err:
229 dev_notice(dev, "initialization failed\n");
230 return ret;
231 }
232
sp_pci_remove(struct pci_dev * pdev)233 static void sp_pci_remove(struct pci_dev *pdev)
234 {
235 struct device *dev = &pdev->dev;
236 struct sp_device *sp = dev_get_drvdata(dev);
237
238 if (!sp)
239 return;
240
241 sp_destroy(sp);
242
243 sp_free_irqs(sp);
244 }
245
246 #ifdef CONFIG_PM
sp_pci_suspend(struct pci_dev * pdev,pm_message_t state)247 static int sp_pci_suspend(struct pci_dev *pdev, pm_message_t state)
248 {
249 struct device *dev = &pdev->dev;
250 struct sp_device *sp = dev_get_drvdata(dev);
251
252 return sp_suspend(sp, state);
253 }
254
sp_pci_resume(struct pci_dev * pdev)255 static int sp_pci_resume(struct pci_dev *pdev)
256 {
257 struct device *dev = &pdev->dev;
258 struct sp_device *sp = dev_get_drvdata(dev);
259
260 return sp_resume(sp);
261 }
262 #endif
263
264 #ifdef CONFIG_CRYPTO_DEV_SP_PSP
265 static const struct psp_vdata pspv1 = {
266 .cmdresp_reg = 0x10580,
267 .cmdbuff_addr_lo_reg = 0x105e0,
268 .cmdbuff_addr_hi_reg = 0x105e4,
269 .feature_reg = 0x105fc,
270 .inten_reg = 0x10610,
271 .intsts_reg = 0x10614,
272 };
273
274 static const struct psp_vdata pspv2 = {
275 .cmdresp_reg = 0x10980,
276 .cmdbuff_addr_lo_reg = 0x109e0,
277 .cmdbuff_addr_hi_reg = 0x109e4,
278 .feature_reg = 0x109fc,
279 .inten_reg = 0x10690,
280 .intsts_reg = 0x10694,
281 };
282 #endif
283
284 static const struct sp_dev_vdata dev_vdata[] = {
285 { /* 0 */
286 .bar = 2,
287 #ifdef CONFIG_CRYPTO_DEV_SP_CCP
288 .ccp_vdata = &ccpv3,
289 #endif
290 },
291 { /* 1 */
292 .bar = 2,
293 #ifdef CONFIG_CRYPTO_DEV_SP_CCP
294 .ccp_vdata = &ccpv5a,
295 #endif
296 #ifdef CONFIG_CRYPTO_DEV_SP_PSP
297 .psp_vdata = &pspv1,
298 #endif
299 },
300 { /* 2 */
301 .bar = 2,
302 #ifdef CONFIG_CRYPTO_DEV_SP_CCP
303 .ccp_vdata = &ccpv5b,
304 #endif
305 },
306 { /* 3 */
307 .bar = 2,
308 #ifdef CONFIG_CRYPTO_DEV_SP_CCP
309 .ccp_vdata = &ccpv5a,
310 #endif
311 #ifdef CONFIG_CRYPTO_DEV_SP_PSP
312 .psp_vdata = &pspv2,
313 #endif
314 },
315 };
316 static const struct pci_device_id sp_pci_table[] = {
317 { PCI_VDEVICE(AMD, 0x1537), (kernel_ulong_t)&dev_vdata[0] },
318 { PCI_VDEVICE(AMD, 0x1456), (kernel_ulong_t)&dev_vdata[1] },
319 { PCI_VDEVICE(AMD, 0x1468), (kernel_ulong_t)&dev_vdata[2] },
320 { PCI_VDEVICE(AMD, 0x1486), (kernel_ulong_t)&dev_vdata[3] },
321 /* Last entry must be zero */
322 { 0, }
323 };
324 MODULE_DEVICE_TABLE(pci, sp_pci_table);
325
326 static struct pci_driver sp_pci_driver = {
327 .name = "ccp",
328 .id_table = sp_pci_table,
329 .probe = sp_pci_probe,
330 .remove = sp_pci_remove,
331 #ifdef CONFIG_PM
332 .suspend = sp_pci_suspend,
333 .resume = sp_pci_resume,
334 #endif
335 };
336
sp_pci_init(void)337 int sp_pci_init(void)
338 {
339 return pci_register_driver(&sp_pci_driver);
340 }
341
sp_pci_exit(void)342 void sp_pci_exit(void)
343 {
344 pci_unregister_driver(&sp_pci_driver);
345 }
346
