294 lines
6.3 KiB
C
294 lines
6.3 KiB
C
/*
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* AMD Cryptographic Coprocessor (CCP) driver
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*
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* Copyright (C) 2014,2016 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 coherent;
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};
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static const struct acpi_device_id ccp_acpi_match[];
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static const struct of_device_id ccp_of_match[];
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static struct ccp_vdata *ccp_get_of_version(struct platform_device *pdev)
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{
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#ifdef CONFIG_OF
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const struct of_device_id *match;
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match = of_match_node(ccp_of_match, pdev->dev.of_node);
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if (match && match->data)
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return (struct ccp_vdata *)match->data;
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#endif
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return 0;
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}
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static struct ccp_vdata *ccp_get_acpi_version(struct platform_device *pdev)
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{
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#ifdef CONFIG_ACPI
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const struct acpi_device_id *match;
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match = acpi_match_device(ccp_acpi_match, &pdev->dev);
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if (match && match->driver_data)
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return (struct ccp_vdata *)match->driver_data;
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#endif
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return 0;
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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 = to_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->vdata->perform->irqhandler, 0,
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ccp->name, 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 = to_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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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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enum dev_dma_attr attr;
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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->vdata = pdev->dev.of_node ? ccp_get_of_version(pdev)
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: ccp_get_acpi_version(pdev);
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if (!ccp->vdata || !ccp->vdata->version) {
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ret = -ENODEV;
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dev_err(dev, "missing driver data\n");
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goto e_err;
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}
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ccp->get_irq = ccp_get_irqs;
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ccp->free_irq = ccp_free_irqs;
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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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attr = device_get_dma_attr(dev);
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if (attr == DEV_DMA_NOT_SUPPORTED) {
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dev_err(dev, "DMA is not supported");
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goto e_err;
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}
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ccp_platform->coherent = (attr == DEV_DMA_COHERENT);
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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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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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dev_set_drvdata(dev, ccp);
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ret = ccp->vdata->perform->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->vdata->perform->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", (kernel_ulong_t)&ccpv3 },
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{ },
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};
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MODULE_DEVICE_TABLE(acpi, ccp_acpi_match);
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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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.data = (const void *)&ccpv3 },
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{ },
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};
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MODULE_DEVICE_TABLE(of, ccp_of_match);
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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 = "ccp",
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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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