/* * AMD Cryptographic Coprocessor (CCP) driver * * Copyright (C) 2014,2016 Advanced Micro Devices, Inc. * * Author: Tom Lendacky * * This program is free software; you can redistribute it and/or modify * it under the terms of the GNU General Public License version 2 as * published by the Free Software Foundation. */ #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include "ccp-dev.h" struct ccp_platform { int coherent; }; static const struct acpi_device_id ccp_acpi_match[]; static const struct of_device_id ccp_of_match[]; static struct ccp_vdata *ccp_get_of_version(struct platform_device *pdev) { #ifdef CONFIG_OF const struct of_device_id *match; match = of_match_node(ccp_of_match, pdev->dev.of_node); if (match && match->data) return (struct ccp_vdata *)match->data; #endif return 0; } static struct ccp_vdata *ccp_get_acpi_version(struct platform_device *pdev) { #ifdef CONFIG_ACPI const struct acpi_device_id *match; match = acpi_match_device(ccp_acpi_match, &pdev->dev); if (match && match->driver_data) return (struct ccp_vdata *)match->driver_data; #endif return 0; } static int ccp_get_irq(struct ccp_device *ccp) { struct device *dev = ccp->dev; struct platform_device *pdev = to_platform_device(dev); int ret; ret = platform_get_irq(pdev, 0); if (ret < 0) return ret; ccp->irq = ret; ret = request_irq(ccp->irq, ccp->vdata->perform->irqhandler, 0, ccp->name, dev); if (ret) { dev_notice(dev, "unable to allocate IRQ (%d)\n", ret); return ret; } return 0; } static int ccp_get_irqs(struct ccp_device *ccp) { struct device *dev = ccp->dev; int ret; ret = ccp_get_irq(ccp); if (!ret) return 0; /* Couldn't get an interrupt */ dev_notice(dev, "could not enable interrupts (%d)\n", ret); return ret; } static void ccp_free_irqs(struct ccp_device *ccp) { struct device *dev = ccp->dev; free_irq(ccp->irq, dev); } static struct resource *ccp_find_mmio_area(struct ccp_device *ccp) { struct device *dev = ccp->dev; struct platform_device *pdev = to_platform_device(dev); struct resource *ior; ior = platform_get_resource(pdev, IORESOURCE_MEM, 0); if (ior && (resource_size(ior) >= 0x800)) return ior; return NULL; } static int ccp_platform_probe(struct platform_device *pdev) { struct ccp_device *ccp; struct ccp_platform *ccp_platform; struct device *dev = &pdev->dev; enum dev_dma_attr attr; struct resource *ior; int ret; ret = -ENOMEM; ccp = ccp_alloc_struct(dev); if (!ccp) goto e_err; ccp_platform = devm_kzalloc(dev, sizeof(*ccp_platform), GFP_KERNEL); if (!ccp_platform) goto e_err; ccp->dev_specific = ccp_platform; ccp->vdata = pdev->dev.of_node ? ccp_get_of_version(pdev) : ccp_get_acpi_version(pdev); if (!ccp->vdata || !ccp->vdata->version) { ret = -ENODEV; dev_err(dev, "missing driver data\n"); goto e_err; } ccp->get_irq = ccp_get_irqs; ccp->free_irq = ccp_free_irqs; ior = ccp_find_mmio_area(ccp); ccp->io_map = devm_ioremap_resource(dev, ior); if (IS_ERR(ccp->io_map)) { ret = PTR_ERR(ccp->io_map); goto e_err; } ccp->io_regs = ccp->io_map; attr = device_get_dma_attr(dev); if (attr == DEV_DMA_NOT_SUPPORTED) { dev_err(dev, "DMA is not supported"); goto e_err; } ccp_platform->coherent = (attr == DEV_DMA_COHERENT); if (ccp_platform->coherent) ccp->axcache = CACHE_WB_NO_ALLOC; else ccp->axcache = CACHE_NONE; ret = dma_set_mask_and_coherent(dev, DMA_BIT_MASK(48)); if (ret) { dev_err(dev, "dma_set_mask_and_coherent failed (%d)\n", ret); goto e_err; } dev_set_drvdata(dev, ccp); ret = ccp->vdata->perform->init(ccp); if (ret) goto e_err; dev_notice(dev, "enabled\n"); return 0; e_err: dev_notice(dev, "initialization failed\n"); return ret; } static int ccp_platform_remove(struct platform_device *pdev) { struct device *dev = &pdev->dev; struct ccp_device *ccp = dev_get_drvdata(dev); ccp->vdata->perform->destroy(ccp); dev_notice(dev, "disabled\n"); return 0; } #ifdef CONFIG_PM static int ccp_platform_suspend(struct platform_device *pdev, pm_message_t state) { struct device *dev = &pdev->dev; struct ccp_device *ccp = dev_get_drvdata(dev); unsigned long flags; unsigned int i; spin_lock_irqsave(&ccp->cmd_lock, flags); ccp->suspending = 1; /* Wake all the queue kthreads to prepare for suspend */ for (i = 0; i < ccp->cmd_q_count; i++) wake_up_process(ccp->cmd_q[i].kthread); spin_unlock_irqrestore(&ccp->cmd_lock, flags); /* Wait for all queue kthreads to say they're done */ while (!ccp_queues_suspended(ccp)) wait_event_interruptible(ccp->suspend_queue, ccp_queues_suspended(ccp)); return 0; } static int ccp_platform_resume(struct platform_device *pdev) { struct device *dev = &pdev->dev; struct ccp_device *ccp = dev_get_drvdata(dev); unsigned long flags; unsigned int i; spin_lock_irqsave(&ccp->cmd_lock, flags); ccp->suspending = 0; /* Wake up all the kthreads */ for (i = 0; i < ccp->cmd_q_count; i++) { ccp->cmd_q[i].suspended = 0; wake_up_process(ccp->cmd_q[i].kthread); } spin_unlock_irqrestore(&ccp->cmd_lock, flags); return 0; } #endif #ifdef CONFIG_ACPI static const struct acpi_device_id ccp_acpi_match[] = { { "AMDI0C00", (kernel_ulong_t)&ccpv3 }, { }, }; MODULE_DEVICE_TABLE(acpi, ccp_acpi_match); #endif #ifdef CONFIG_OF static const struct of_device_id ccp_of_match[] = { { .compatible = "amd,ccp-seattle-v1a", .data = (const void *)&ccpv3 }, { }, }; MODULE_DEVICE_TABLE(of, ccp_of_match); #endif static struct platform_driver ccp_platform_driver = { .driver = { .name = "ccp", #ifdef CONFIG_ACPI .acpi_match_table = ccp_acpi_match, #endif #ifdef CONFIG_OF .of_match_table = ccp_of_match, #endif }, .probe = ccp_platform_probe, .remove = ccp_platform_remove, #ifdef CONFIG_PM .suspend = ccp_platform_suspend, .resume = ccp_platform_resume, #endif }; int ccp_platform_init(void) { return platform_driver_register(&ccp_platform_driver); } void ccp_platform_exit(void) { platform_driver_unregister(&ccp_platform_driver); }