2 * AMD Secure Processor device driver
4 * Copyright (C) 2013,2016 Advanced Micro Devices, Inc.
6 * Author: Tom Lendacky <thomas.lendacky@amd.com>
7 * Author: Gary R Hook <gary.hook@amd.com>
9 * This program is free software; you can redistribute it and/or modify
10 * it under the terms of the GNU General Public License version 2 as
11 * published by the Free Software Foundation.
14 #include <linux/module.h>
15 #include <linux/kernel.h>
16 #include <linux/device.h>
17 #include <linux/pci.h>
18 #include <linux/pci_ids.h>
19 #include <linux/dma-mapping.h>
20 #include <linux/kthread.h>
21 #include <linux/sched.h>
22 #include <linux/interrupt.h>
23 #include <linux/spinlock.h>
24 #include <linux/delay.h>
25 #include <linux/ccp.h>
30 #define MSIX_VECTORS 2
34 struct msix_entry msix_entry[MSIX_VECTORS];
36 static struct sp_device *sp_dev_master;
38 static int sp_get_msix_irqs(struct sp_device *sp)
40 struct sp_pci *sp_pci = sp->dev_specific;
41 struct device *dev = sp->dev;
42 struct pci_dev *pdev = to_pci_dev(dev);
45 for (v = 0; v < ARRAY_SIZE(sp_pci->msix_entry); v++)
46 sp_pci->msix_entry[v].entry = v;
48 ret = pci_enable_msix_range(pdev, sp_pci->msix_entry, 1, v);
52 sp_pci->msix_count = ret;
53 sp->use_tasklet = true;
55 sp->psp_irq = sp_pci->msix_entry[0].vector;
56 sp->ccp_irq = (sp_pci->msix_count > 1) ? sp_pci->msix_entry[1].vector
57 : sp_pci->msix_entry[0].vector;
61 static int sp_get_msi_irq(struct sp_device *sp)
63 struct device *dev = sp->dev;
64 struct pci_dev *pdev = to_pci_dev(dev);
67 ret = pci_enable_msi(pdev);
71 sp->ccp_irq = pdev->irq;
72 sp->psp_irq = pdev->irq;
77 static int sp_get_irqs(struct sp_device *sp)
79 struct device *dev = sp->dev;
82 ret = sp_get_msix_irqs(sp);
86 /* Couldn't get MSI-X vectors, try MSI */
87 dev_notice(dev, "could not enable MSI-X (%d), trying MSI\n", ret);
88 ret = sp_get_msi_irq(sp);
92 /* Couldn't get MSI interrupt */
93 dev_notice(dev, "could not enable MSI (%d)\n", ret);
98 static void sp_free_irqs(struct sp_device *sp)
100 struct sp_pci *sp_pci = sp->dev_specific;
101 struct device *dev = sp->dev;
102 struct pci_dev *pdev = to_pci_dev(dev);
104 if (sp_pci->msix_count)
105 pci_disable_msix(pdev);
106 else if (sp->psp_irq)
107 pci_disable_msi(pdev);
113 static bool sp_pci_is_master(struct sp_device *sp)
115 struct device *dev_cur, *dev_new;
116 struct pci_dev *pdev_cur, *pdev_new;
119 dev_cur = sp_dev_master->dev;
121 pdev_new = to_pci_dev(dev_new);
122 pdev_cur = to_pci_dev(dev_cur);
124 if (pdev_new->bus->number < pdev_cur->bus->number)
127 if (PCI_SLOT(pdev_new->devfn) < PCI_SLOT(pdev_cur->devfn))
130 if (PCI_FUNC(pdev_new->devfn) < PCI_FUNC(pdev_cur->devfn))
136 static void psp_set_master(struct sp_device *sp)
138 if (!sp_dev_master) {
143 if (sp_pci_is_master(sp))
147 static struct sp_device *psp_get_master(void)
149 return sp_dev_master;
152 static int sp_pci_probe(struct pci_dev *pdev, const struct pci_device_id *id)
154 struct sp_device *sp;
155 struct sp_pci *sp_pci;
156 struct device *dev = &pdev->dev;
157 void __iomem * const *iomap_table;
162 sp = sp_alloc_struct(dev);
166 sp_pci = devm_kzalloc(dev, sizeof(*sp_pci), GFP_KERNEL);
170 sp->dev_specific = sp_pci;
171 sp->dev_vdata = (struct sp_dev_vdata *)id->driver_data;
172 if (!sp->dev_vdata) {
174 dev_err(dev, "missing driver data\n");
178 ret = pcim_enable_device(pdev);
180 dev_err(dev, "pcim_enable_device failed (%d)\n", ret);
184 bar_mask = pci_select_bars(pdev, IORESOURCE_MEM);
185 ret = pcim_iomap_regions(pdev, bar_mask, "ccp");
187 dev_err(dev, "pcim_iomap_regions failed (%d)\n", ret);
191 iomap_table = pcim_iomap_table(pdev);
193 dev_err(dev, "pcim_iomap_table failed\n");
198 sp->io_map = iomap_table[sp->dev_vdata->bar];
200 dev_err(dev, "ioremap failed\n");
205 ret = sp_get_irqs(sp);
209 pci_set_master(pdev);
210 sp->set_psp_master_device = psp_set_master;
211 sp->get_psp_master_device = psp_get_master;
213 ret = dma_set_mask_and_coherent(dev, DMA_BIT_MASK(48));
215 ret = dma_set_mask_and_coherent(dev, DMA_BIT_MASK(32));
217 dev_err(dev, "dma_set_mask_and_coherent failed (%d)\n",
223 dev_set_drvdata(dev, sp);
229 dev_notice(dev, "enabled\n");
234 dev_notice(dev, "initialization failed\n");
238 static void sp_pci_remove(struct pci_dev *pdev)
240 struct device *dev = &pdev->dev;
241 struct sp_device *sp = dev_get_drvdata(dev);
250 dev_notice(dev, "disabled\n");
254 static int sp_pci_suspend(struct pci_dev *pdev, pm_message_t state)
256 struct device *dev = &pdev->dev;
257 struct sp_device *sp = dev_get_drvdata(dev);
259 return sp_suspend(sp, state);
262 static int sp_pci_resume(struct pci_dev *pdev)
264 struct device *dev = &pdev->dev;
265 struct sp_device *sp = dev_get_drvdata(dev);
267 return sp_resume(sp);
271 #ifdef CONFIG_CRYPTO_DEV_SP_PSP
272 static const struct psp_vdata psp_entry = {
277 static const struct sp_dev_vdata dev_vdata[] = {
280 #ifdef CONFIG_CRYPTO_DEV_SP_CCP
286 #ifdef CONFIG_CRYPTO_DEV_SP_CCP
287 .ccp_vdata = &ccpv5a,
289 #ifdef CONFIG_CRYPTO_DEV_SP_PSP
290 .psp_vdata = &psp_entry
295 #ifdef CONFIG_CRYPTO_DEV_SP_CCP
296 .ccp_vdata = &ccpv5b,
300 static const struct pci_device_id sp_pci_table[] = {
301 { PCI_VDEVICE(AMD, 0x1537), (kernel_ulong_t)&dev_vdata[0] },
302 { PCI_VDEVICE(AMD, 0x1456), (kernel_ulong_t)&dev_vdata[1] },
303 { PCI_VDEVICE(AMD, 0x1468), (kernel_ulong_t)&dev_vdata[2] },
304 /* Last entry must be zero */
307 MODULE_DEVICE_TABLE(pci, sp_pci_table);
309 static struct pci_driver sp_pci_driver = {
311 .id_table = sp_pci_table,
312 .probe = sp_pci_probe,
313 .remove = sp_pci_remove,
315 .suspend = sp_pci_suspend,
316 .resume = sp_pci_resume,
320 int sp_pci_init(void)
322 return pci_register_driver(&sp_pci_driver);
325 void sp_pci_exit(void)
327 pci_unregister_driver(&sp_pci_driver);