/* * AMD Cryptographic Coprocessor (CCP) driver * * Copyright (C) 2014 Advanced Micro Devices, Inc. * * Author: Tom Lendacky <thomas.lendacky@amd.com> * * 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 <linux/module.h> #include <linux/kernel.h> #include <linux/device.h> #include <linux/platform_device.h> #include <linux/ioport.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 <linux/of.h> #include <linux/of_address.h> #include <linux/acpi.h> #include "ccp-dev.h" struct ccp_platform { int use_acpi; int coherent; }; static int ccp_get_irq(struct ccp_device *ccp) { struct device *dev = ccp->dev; struct platform_device *pdev = container_of(dev, struct 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_irq_handler, 0, "ccp", 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 = container_of(dev, struct 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; struct acpi_device *adev = ACPI_COMPANION(dev); 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->get_irq = ccp_get_irqs; ccp->free_irq = ccp_free_irqs; ccp_platform->use_acpi = (!adev || acpi_disabled) ? 0 : 1; 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; 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; } ccp_platform->coherent = device_dma_is_coherent(ccp->dev); if (ccp_platform->coherent) ccp->axcache = CACHE_WB_NO_ALLOC; else ccp->axcache = CACHE_NONE; dev_set_drvdata(dev, ccp); ret = ccp_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_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", 0 }, { }, }; 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" }, { }, }; MODULE_DEVICE_TABLE(of, ccp_of_match); #endif static struct platform_driver ccp_platform_driver = { .driver = { .name = "AMD Cryptographic Coprocessor", #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); }