| // SPDX-License-Identifier: GPL-2.0-only |
| /* |
| * AMD Secure Processor device driver |
| * |
| * Copyright (C) 2013,2018 Advanced Micro Devices, Inc. |
| * |
| * Author: Tom Lendacky <thomas.lendacky@amd.com> |
| * Author: Gary R Hook <gary.hook@amd.com> |
| */ |
| |
| #include <linux/module.h> |
| #include <linux/kernel.h> |
| #include <linux/device.h> |
| #include <linux/pci.h> |
| #include <linux/pci_ids.h> |
| #include <linux/dma-mapping.h> |
| #include <linux/kthread.h> |
| #include <linux/sched.h> |
| #include <linux/interrupt.h> |
| #include <linux/spinlock.h> |
| #include <linux/delay.h> |
| #include <linux/ccp.h> |
| |
| #include "ccp-dev.h" |
| #include "psp-dev.h" |
| |
| #define MSIX_VECTORS 2 |
| |
| struct sp_pci { |
| int msix_count; |
| struct msix_entry msix_entry[MSIX_VECTORS]; |
| }; |
| static struct sp_device *sp_dev_master; |
| |
| static int sp_get_msix_irqs(struct sp_device *sp) |
| { |
| struct sp_pci *sp_pci = sp->dev_specific; |
| struct device *dev = sp->dev; |
| struct pci_dev *pdev = to_pci_dev(dev); |
| int v, ret; |
| |
| for (v = 0; v < ARRAY_SIZE(sp_pci->msix_entry); v++) |
| sp_pci->msix_entry[v].entry = v; |
| |
| ret = pci_enable_msix_range(pdev, sp_pci->msix_entry, 1, v); |
| if (ret < 0) |
| return ret; |
| |
| sp_pci->msix_count = ret; |
| sp->use_tasklet = true; |
| |
| sp->psp_irq = sp_pci->msix_entry[0].vector; |
| sp->ccp_irq = (sp_pci->msix_count > 1) ? sp_pci->msix_entry[1].vector |
| : sp_pci->msix_entry[0].vector; |
| return 0; |
| } |
| |
| static int sp_get_msi_irq(struct sp_device *sp) |
| { |
| struct device *dev = sp->dev; |
| struct pci_dev *pdev = to_pci_dev(dev); |
| int ret; |
| |
| ret = pci_enable_msi(pdev); |
| if (ret) |
| return ret; |
| |
| sp->ccp_irq = pdev->irq; |
| sp->psp_irq = pdev->irq; |
| |
| return 0; |
| } |
| |
| static int sp_get_irqs(struct sp_device *sp) |
| { |
| struct device *dev = sp->dev; |
| int ret; |
| |
| ret = sp_get_msix_irqs(sp); |
| if (!ret) |
| return 0; |
| |
| /* Couldn't get MSI-X vectors, try MSI */ |
| dev_notice(dev, "could not enable MSI-X (%d), trying MSI\n", ret); |
| ret = sp_get_msi_irq(sp); |
| if (!ret) |
| return 0; |
| |
| /* Couldn't get MSI interrupt */ |
| dev_notice(dev, "could not enable MSI (%d)\n", ret); |
| |
| return ret; |
| } |
| |
| static void sp_free_irqs(struct sp_device *sp) |
| { |
| struct sp_pci *sp_pci = sp->dev_specific; |
| struct device *dev = sp->dev; |
| struct pci_dev *pdev = to_pci_dev(dev); |
| |
| if (sp_pci->msix_count) |
| pci_disable_msix(pdev); |
| else if (sp->psp_irq) |
| pci_disable_msi(pdev); |
| |
| sp->ccp_irq = 0; |
| sp->psp_irq = 0; |
| } |
| |
| static bool sp_pci_is_master(struct sp_device *sp) |
| { |
| struct device *dev_cur, *dev_new; |
| struct pci_dev *pdev_cur, *pdev_new; |
| |
| dev_new = sp->dev; |
| dev_cur = sp_dev_master->dev; |
| |
| pdev_new = to_pci_dev(dev_new); |
| pdev_cur = to_pci_dev(dev_cur); |
| |
| if (pdev_new->bus->number < pdev_cur->bus->number) |
| return true; |
| |
| if (PCI_SLOT(pdev_new->devfn) < PCI_SLOT(pdev_cur->devfn)) |
| return true; |
| |
| if (PCI_FUNC(pdev_new->devfn) < PCI_FUNC(pdev_cur->devfn)) |
| return true; |
| |
| return false; |
| } |
| |
| static void psp_set_master(struct sp_device *sp) |
| { |
| if (!sp_dev_master) { |
| sp_dev_master = sp; |
| return; |
| } |
| |
| if (sp_pci_is_master(sp)) |
| sp_dev_master = sp; |
| } |
| |
| static struct sp_device *psp_get_master(void) |
| { |
| return sp_dev_master; |
| } |
| |
| static int sp_pci_probe(struct pci_dev *pdev, const struct pci_device_id *id) |
| { |
| struct sp_device *sp; |
| struct sp_pci *sp_pci; |
| struct device *dev = &pdev->dev; |
| void __iomem * const *iomap_table; |
| int bar_mask; |
| int ret; |
| |
| ret = -ENOMEM; |
| sp = sp_alloc_struct(dev); |
| if (!sp) |
| goto e_err; |
| |
| sp_pci = devm_kzalloc(dev, sizeof(*sp_pci), GFP_KERNEL); |
| if (!sp_pci) |
| goto e_err; |
| |
| sp->dev_specific = sp_pci; |
| sp->dev_vdata = (struct sp_dev_vdata *)id->driver_data; |
| if (!sp->dev_vdata) { |
| ret = -ENODEV; |
| dev_err(dev, "missing driver data\n"); |
| goto e_err; |
| } |
| |
| ret = pcim_enable_device(pdev); |
| if (ret) { |
| dev_err(dev, "pcim_enable_device failed (%d)\n", ret); |
| goto e_err; |
| } |
| |
| bar_mask = pci_select_bars(pdev, IORESOURCE_MEM); |
| ret = pcim_iomap_regions(pdev, bar_mask, "ccp"); |
| if (ret) { |
| dev_err(dev, "pcim_iomap_regions failed (%d)\n", ret); |
| goto e_err; |
| } |
| |
| iomap_table = pcim_iomap_table(pdev); |
| if (!iomap_table) { |
| dev_err(dev, "pcim_iomap_table failed\n"); |
| ret = -ENOMEM; |
| goto e_err; |
| } |
| |
| sp->io_map = iomap_table[sp->dev_vdata->bar]; |
| if (!sp->io_map) { |
| dev_err(dev, "ioremap failed\n"); |
| ret = -ENOMEM; |
| goto e_err; |
| } |
| |
| ret = sp_get_irqs(sp); |
| if (ret) |
| goto e_err; |
| |
| pci_set_master(pdev); |
| sp->set_psp_master_device = psp_set_master; |
| sp->get_psp_master_device = psp_get_master; |
| |
| ret = dma_set_mask_and_coherent(dev, DMA_BIT_MASK(48)); |
| if (ret) { |
| ret = dma_set_mask_and_coherent(dev, DMA_BIT_MASK(32)); |
| if (ret) { |
| dev_err(dev, "dma_set_mask_and_coherent failed (%d)\n", |
| ret); |
| goto free_irqs; |
| } |
| } |
| |
| dev_set_drvdata(dev, sp); |
| |
| ret = sp_init(sp); |
| if (ret) |
| goto free_irqs; |
| |
| return 0; |
| |
| free_irqs: |
| sp_free_irqs(sp); |
| e_err: |
| dev_notice(dev, "initialization failed\n"); |
| return ret; |
| } |
| |
| static void sp_pci_remove(struct pci_dev *pdev) |
| { |
| struct device *dev = &pdev->dev; |
| struct sp_device *sp = dev_get_drvdata(dev); |
| |
| if (!sp) |
| return; |
| |
| sp_destroy(sp); |
| |
| sp_free_irqs(sp); |
| } |
| |
| #ifdef CONFIG_PM |
| static int sp_pci_suspend(struct pci_dev *pdev, pm_message_t state) |
| { |
| struct device *dev = &pdev->dev; |
| struct sp_device *sp = dev_get_drvdata(dev); |
| |
| return sp_suspend(sp, state); |
| } |
| |
| static int sp_pci_resume(struct pci_dev *pdev) |
| { |
| struct device *dev = &pdev->dev; |
| struct sp_device *sp = dev_get_drvdata(dev); |
| |
| return sp_resume(sp); |
| } |
| #endif |
| |
| #ifdef CONFIG_CRYPTO_DEV_SP_PSP |
| static const struct psp_vdata pspv1 = { |
| .cmdresp_reg = 0x10580, |
| .cmdbuff_addr_lo_reg = 0x105e0, |
| .cmdbuff_addr_hi_reg = 0x105e4, |
| .feature_reg = 0x105fc, |
| .inten_reg = 0x10610, |
| .intsts_reg = 0x10614, |
| }; |
| |
| static const struct psp_vdata pspv2 = { |
| .cmdresp_reg = 0x10980, |
| .cmdbuff_addr_lo_reg = 0x109e0, |
| .cmdbuff_addr_hi_reg = 0x109e4, |
| .feature_reg = 0x109fc, |
| .inten_reg = 0x10690, |
| .intsts_reg = 0x10694, |
| }; |
| #endif |
| |
| static const struct sp_dev_vdata dev_vdata[] = { |
| { /* 0 */ |
| .bar = 2, |
| #ifdef CONFIG_CRYPTO_DEV_SP_CCP |
| .ccp_vdata = &ccpv3, |
| #endif |
| }, |
| { /* 1 */ |
| .bar = 2, |
| #ifdef CONFIG_CRYPTO_DEV_SP_CCP |
| .ccp_vdata = &ccpv5a, |
| #endif |
| #ifdef CONFIG_CRYPTO_DEV_SP_PSP |
| .psp_vdata = &pspv1, |
| #endif |
| }, |
| { /* 2 */ |
| .bar = 2, |
| #ifdef CONFIG_CRYPTO_DEV_SP_CCP |
| .ccp_vdata = &ccpv5b, |
| #endif |
| }, |
| { /* 3 */ |
| .bar = 2, |
| #ifdef CONFIG_CRYPTO_DEV_SP_CCP |
| .ccp_vdata = &ccpv5a, |
| #endif |
| #ifdef CONFIG_CRYPTO_DEV_SP_PSP |
| .psp_vdata = &pspv2, |
| #endif |
| }, |
| }; |
| static const struct pci_device_id sp_pci_table[] = { |
| { PCI_VDEVICE(AMD, 0x1537), (kernel_ulong_t)&dev_vdata[0] }, |
| { PCI_VDEVICE(AMD, 0x1456), (kernel_ulong_t)&dev_vdata[1] }, |
| { PCI_VDEVICE(AMD, 0x1468), (kernel_ulong_t)&dev_vdata[2] }, |
| { PCI_VDEVICE(AMD, 0x1486), (kernel_ulong_t)&dev_vdata[3] }, |
| /* Last entry must be zero */ |
| { 0, } |
| }; |
| MODULE_DEVICE_TABLE(pci, sp_pci_table); |
| |
| static struct pci_driver sp_pci_driver = { |
| .name = "ccp", |
| .id_table = sp_pci_table, |
| .probe = sp_pci_probe, |
| .remove = sp_pci_remove, |
| #ifdef CONFIG_PM |
| .suspend = sp_pci_suspend, |
| .resume = sp_pci_resume, |
| #endif |
| }; |
| |
| int sp_pci_init(void) |
| { |
| return pci_register_driver(&sp_pci_driver); |
| } |
| |
| void sp_pci_exit(void) |
| { |
| pci_unregister_driver(&sp_pci_driver); |
| } |