315 строки
6.4 KiB
C
315 строки
6.4 KiB
C
/*
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* AMD Cryptographic Coprocessor (CCP) driver
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*
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* Copyright (C) 2014 Advanced Micro Devices, Inc.
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*
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* Author: Tom Lendacky <thomas.lendacky@amd.com>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation.
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*/
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#include <linux/module.h>
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#include <linux/kernel.h>
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#include <linux/device.h>
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#include <linux/platform_device.h>
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#include <linux/ioport.h>
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#include <linux/dma-mapping.h>
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#include <linux/kthread.h>
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#include <linux/sched.h>
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#include <linux/interrupt.h>
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#include <linux/spinlock.h>
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#include <linux/delay.h>
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#include <linux/ccp.h>
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#include <linux/of.h>
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#include <linux/of_address.h>
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#include <linux/acpi.h>
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#include "ccp-dev.h"
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struct ccp_platform {
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int use_acpi;
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int coherent;
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};
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static int ccp_get_irq(struct ccp_device *ccp)
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{
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struct device *dev = ccp->dev;
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struct platform_device *pdev = container_of(dev,
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struct platform_device, dev);
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int ret;
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ret = platform_get_irq(pdev, 0);
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if (ret < 0)
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return ret;
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ccp->irq = ret;
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ret = request_irq(ccp->irq, ccp_irq_handler, 0, "ccp", dev);
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if (ret) {
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dev_notice(dev, "unable to allocate IRQ (%d)\n", ret);
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return ret;
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}
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return 0;
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}
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static int ccp_get_irqs(struct ccp_device *ccp)
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{
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struct device *dev = ccp->dev;
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int ret;
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ret = ccp_get_irq(ccp);
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if (!ret)
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return 0;
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/* Couldn't get an interrupt */
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dev_notice(dev, "could not enable interrupts (%d)\n", ret);
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return ret;
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}
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static void ccp_free_irqs(struct ccp_device *ccp)
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{
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struct device *dev = ccp->dev;
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free_irq(ccp->irq, dev);
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}
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static struct resource *ccp_find_mmio_area(struct ccp_device *ccp)
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{
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struct device *dev = ccp->dev;
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struct platform_device *pdev = container_of(dev,
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struct platform_device, dev);
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struct resource *ior;
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ior = platform_get_resource(pdev, IORESOURCE_MEM, 0);
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if (ior && (resource_size(ior) >= 0x800))
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return ior;
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return NULL;
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}
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#ifdef CONFIG_ACPI
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static int ccp_acpi_support(struct ccp_device *ccp)
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{
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struct ccp_platform *ccp_platform = ccp->dev_specific;
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struct acpi_device *adev = ACPI_COMPANION(ccp->dev);
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acpi_handle handle;
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acpi_status status;
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unsigned long long data;
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int cca;
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/* Retrieve the device cache coherency value */
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handle = adev->handle;
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do {
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status = acpi_evaluate_integer(handle, "_CCA", NULL, &data);
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if (!ACPI_FAILURE(status)) {
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cca = data;
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break;
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}
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} while (!ACPI_FAILURE(status));
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if (ACPI_FAILURE(status)) {
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dev_err(ccp->dev, "error obtaining acpi coherency value\n");
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return -EINVAL;
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}
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ccp_platform->coherent = !!cca;
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return 0;
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}
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#else /* CONFIG_ACPI */
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static int ccp_acpi_support(struct ccp_device *ccp)
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{
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return -EINVAL;
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}
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#endif
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#ifdef CONFIG_OF
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static int ccp_of_support(struct ccp_device *ccp)
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{
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struct ccp_platform *ccp_platform = ccp->dev_specific;
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ccp_platform->coherent = of_dma_is_coherent(ccp->dev->of_node);
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return 0;
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}
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#else
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static int ccp_of_support(struct ccp_device *ccp)
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{
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return -EINVAL;
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}
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#endif
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static int ccp_platform_probe(struct platform_device *pdev)
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{
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struct ccp_device *ccp;
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struct ccp_platform *ccp_platform;
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struct device *dev = &pdev->dev;
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struct acpi_device *adev = ACPI_COMPANION(dev);
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struct resource *ior;
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int ret;
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ret = -ENOMEM;
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ccp = ccp_alloc_struct(dev);
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if (!ccp)
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goto e_err;
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ccp_platform = devm_kzalloc(dev, sizeof(*ccp_platform), GFP_KERNEL);
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if (!ccp_platform)
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goto e_err;
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ccp->dev_specific = ccp_platform;
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ccp->get_irq = ccp_get_irqs;
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ccp->free_irq = ccp_free_irqs;
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ccp_platform->use_acpi = (!adev || acpi_disabled) ? 0 : 1;
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ior = ccp_find_mmio_area(ccp);
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ccp->io_map = devm_ioremap_resource(dev, ior);
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if (IS_ERR(ccp->io_map)) {
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ret = PTR_ERR(ccp->io_map);
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goto e_err;
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}
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ccp->io_regs = ccp->io_map;
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if (!dev->dma_mask)
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dev->dma_mask = &dev->coherent_dma_mask;
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ret = dma_set_mask_and_coherent(dev, DMA_BIT_MASK(48));
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if (ret) {
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dev_err(dev, "dma_set_mask_and_coherent failed (%d)\n", ret);
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goto e_err;
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}
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if (ccp_platform->use_acpi)
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ret = ccp_acpi_support(ccp);
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else
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ret = ccp_of_support(ccp);
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if (ret)
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goto e_err;
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if (ccp_platform->coherent)
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ccp->axcache = CACHE_WB_NO_ALLOC;
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else
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ccp->axcache = CACHE_NONE;
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dev_set_drvdata(dev, ccp);
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ret = ccp_init(ccp);
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if (ret)
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goto e_err;
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dev_notice(dev, "enabled\n");
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return 0;
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e_err:
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dev_notice(dev, "initialization failed\n");
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return ret;
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}
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static int ccp_platform_remove(struct platform_device *pdev)
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{
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struct device *dev = &pdev->dev;
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struct ccp_device *ccp = dev_get_drvdata(dev);
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ccp_destroy(ccp);
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dev_notice(dev, "disabled\n");
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return 0;
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}
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#ifdef CONFIG_PM
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static int ccp_platform_suspend(struct platform_device *pdev,
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pm_message_t state)
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{
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struct device *dev = &pdev->dev;
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struct ccp_device *ccp = dev_get_drvdata(dev);
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unsigned long flags;
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unsigned int i;
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spin_lock_irqsave(&ccp->cmd_lock, flags);
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ccp->suspending = 1;
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/* Wake all the queue kthreads to prepare for suspend */
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for (i = 0; i < ccp->cmd_q_count; i++)
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wake_up_process(ccp->cmd_q[i].kthread);
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spin_unlock_irqrestore(&ccp->cmd_lock, flags);
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/* Wait for all queue kthreads to say they're done */
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while (!ccp_queues_suspended(ccp))
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wait_event_interruptible(ccp->suspend_queue,
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ccp_queues_suspended(ccp));
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return 0;
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}
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static int ccp_platform_resume(struct platform_device *pdev)
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{
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struct device *dev = &pdev->dev;
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struct ccp_device *ccp = dev_get_drvdata(dev);
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unsigned long flags;
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unsigned int i;
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spin_lock_irqsave(&ccp->cmd_lock, flags);
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ccp->suspending = 0;
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/* Wake up all the kthreads */
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for (i = 0; i < ccp->cmd_q_count; i++) {
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ccp->cmd_q[i].suspended = 0;
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wake_up_process(ccp->cmd_q[i].kthread);
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}
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spin_unlock_irqrestore(&ccp->cmd_lock, flags);
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return 0;
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}
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#endif
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#ifdef CONFIG_ACPI
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static const struct acpi_device_id ccp_acpi_match[] = {
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{ "AMDI0C00", 0 },
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{ },
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};
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#endif
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#ifdef CONFIG_OF
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static const struct of_device_id ccp_of_match[] = {
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{ .compatible = "amd,ccp-seattle-v1a" },
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{ },
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};
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#endif
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static struct platform_driver ccp_platform_driver = {
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.driver = {
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.name = "AMD Cryptographic Coprocessor",
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#ifdef CONFIG_ACPI
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.acpi_match_table = ccp_acpi_match,
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#endif
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#ifdef CONFIG_OF
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.of_match_table = ccp_of_match,
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#endif
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},
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.probe = ccp_platform_probe,
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.remove = ccp_platform_remove,
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#ifdef CONFIG_PM
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.suspend = ccp_platform_suspend,
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.resume = ccp_platform_resume,
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#endif
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};
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int ccp_platform_init(void)
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{
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return platform_driver_register(&ccp_platform_driver);
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}
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void ccp_platform_exit(void)
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{
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platform_driver_unregister(&ccp_platform_driver);
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}
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