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crypto: ccp - Add platform device support for arm64
Add support for the CCP on arm64 as a platform device. Signed-off-by: Tom Lendacky <[email protected]> Signed-off-by: Herbert Xu <[email protected]>
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/* | ||
* AMD Cryptographic Coprocessor (CCP) driver | ||
* | ||
* Copyright (C) 2014 Advanced Micro Devices, Inc. | ||
* | ||
* Author: Tom Lendacky <[email protected]> | ||
* | ||
* 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. | ||
*/ | ||
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#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> | ||
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#include "ccp-dev.h" | ||
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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; | ||
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ret = platform_get_irq(pdev, 0); | ||
if (ret < 0) | ||
return ret; | ||
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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; | ||
} | ||
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return 0; | ||
} | ||
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static int ccp_get_irqs(struct ccp_device *ccp) | ||
{ | ||
struct device *dev = ccp->dev; | ||
int ret; | ||
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ret = ccp_get_irq(ccp); | ||
if (!ret) | ||
return 0; | ||
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/* Couldn't get an interrupt */ | ||
dev_notice(dev, "could not enable interrupts (%d)\n", ret); | ||
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return ret; | ||
} | ||
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static void ccp_free_irqs(struct ccp_device *ccp) | ||
{ | ||
struct device *dev = ccp->dev; | ||
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free_irq(ccp->irq, dev); | ||
} | ||
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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; | ||
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ior = platform_get_resource(pdev, IORESOURCE_MEM, 0); | ||
if (ior && (resource_size(ior) >= 0x800)) | ||
return ior; | ||
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return NULL; | ||
} | ||
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static int ccp_platform_probe(struct platform_device *pdev) | ||
{ | ||
struct ccp_device *ccp; | ||
struct device *dev = &pdev->dev; | ||
struct resource *ior; | ||
int ret; | ||
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ret = -ENOMEM; | ||
ccp = ccp_alloc_struct(dev); | ||
if (!ccp) | ||
goto e_err; | ||
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ccp->dev_specific = NULL; | ||
ccp->get_irq = ccp_get_irqs; | ||
ccp->free_irq = ccp_free_irqs; | ||
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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_free; | ||
} | ||
ccp->io_regs = ccp->io_map; | ||
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if (!dev->dma_mask) | ||
dev->dma_mask = &dev->coherent_dma_mask; | ||
*(dev->dma_mask) = DMA_BIT_MASK(48); | ||
dev->coherent_dma_mask = DMA_BIT_MASK(48); | ||
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dev_set_drvdata(dev, ccp); | ||
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ret = ccp_init(ccp); | ||
if (ret) | ||
goto e_free; | ||
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dev_notice(dev, "enabled\n"); | ||
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return 0; | ||
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e_free: | ||
kfree(ccp); | ||
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e_err: | ||
dev_notice(dev, "initialization failed\n"); | ||
return ret; | ||
} | ||
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static int ccp_platform_remove(struct platform_device *pdev) | ||
{ | ||
struct device *dev = &pdev->dev; | ||
struct ccp_device *ccp = dev_get_drvdata(dev); | ||
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ccp_destroy(ccp); | ||
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kfree(ccp); | ||
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dev_notice(dev, "disabled\n"); | ||
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return 0; | ||
} | ||
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#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; | ||
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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 */ | ||
for (i = 0; i < ccp->cmd_q_count; i++) | ||
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 */ | ||
while (!ccp_queues_suspended(ccp)) | ||
wait_event_interruptible(ccp->suspend_queue, | ||
ccp_queues_suspended(ccp)); | ||
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return 0; | ||
} | ||
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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; | ||
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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 */ | ||
for (i = 0; i < ccp->cmd_q_count; i++) { | ||
ccp->cmd_q[i].suspended = 0; | ||
wake_up_process(ccp->cmd_q[i].kthread); | ||
} | ||
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spin_unlock_irqrestore(&ccp->cmd_lock, flags); | ||
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return 0; | ||
} | ||
#endif | ||
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static const struct of_device_id ccp_platform_ids[] = { | ||
{ .compatible = "amd,ccp-seattle-v1a" }, | ||
{ }, | ||
}; | ||
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static struct platform_driver ccp_platform_driver = { | ||
.driver = { | ||
.name = "AMD Cryptographic Coprocessor", | ||
.owner = THIS_MODULE, | ||
.of_match_table = ccp_platform_ids, | ||
}, | ||
.probe = ccp_platform_probe, | ||
.remove = ccp_platform_remove, | ||
#ifdef CONFIG_PM | ||
.suspend = ccp_platform_suspend, | ||
.resume = ccp_platform_resume, | ||
#endif | ||
}; | ||
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int ccp_platform_init(void) | ||
{ | ||
return platform_driver_register(&ccp_platform_driver); | ||
} | ||
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void ccp_platform_exit(void) | ||
{ | ||
platform_driver_unregister(&ccp_platform_driver); | ||
} |