![Tom Lendacky](/assets/img/avatar_default.png)
Add support for ACPI to the CCP platform driver. Signed-off-by: Tom Lendacky <thomas.lendacky@amd.com> Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
315 lines
6.4 KiB
C
315 lines
6.4 KiB
C
/*
|
|
* 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;
|
|
}
|
|
|
|
#ifdef CONFIG_ACPI
|
|
static int ccp_acpi_support(struct ccp_device *ccp)
|
|
{
|
|
struct ccp_platform *ccp_platform = ccp->dev_specific;
|
|
struct acpi_device *adev = ACPI_COMPANION(ccp->dev);
|
|
acpi_handle handle;
|
|
acpi_status status;
|
|
unsigned long long data;
|
|
int cca;
|
|
|
|
/* Retrieve the device cache coherency value */
|
|
handle = adev->handle;
|
|
do {
|
|
status = acpi_evaluate_integer(handle, "_CCA", NULL, &data);
|
|
if (!ACPI_FAILURE(status)) {
|
|
cca = data;
|
|
break;
|
|
}
|
|
} while (!ACPI_FAILURE(status));
|
|
|
|
if (ACPI_FAILURE(status)) {
|
|
dev_err(ccp->dev, "error obtaining acpi coherency value\n");
|
|
return -EINVAL;
|
|
}
|
|
|
|
ccp_platform->coherent = !!cca;
|
|
|
|
return 0;
|
|
}
|
|
#else /* CONFIG_ACPI */
|
|
static int ccp_acpi_support(struct ccp_device *ccp)
|
|
{
|
|
return -EINVAL;
|
|
}
|
|
#endif
|
|
|
|
#ifdef CONFIG_OF
|
|
static int ccp_of_support(struct ccp_device *ccp)
|
|
{
|
|
struct ccp_platform *ccp_platform = ccp->dev_specific;
|
|
|
|
ccp_platform->coherent = of_dma_is_coherent(ccp->dev->of_node);
|
|
|
|
return 0;
|
|
}
|
|
#else
|
|
static int ccp_of_support(struct ccp_device *ccp)
|
|
{
|
|
return -EINVAL;
|
|
}
|
|
#endif
|
|
|
|
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;
|
|
|
|
if (!dev->dma_mask)
|
|
dev->dma_mask = &dev->coherent_dma_mask;
|
|
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;
|
|
}
|
|
|
|
if (ccp_platform->use_acpi)
|
|
ret = ccp_acpi_support(ccp);
|
|
else
|
|
ret = ccp_of_support(ccp);
|
|
if (ret)
|
|
goto e_err;
|
|
|
|
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 },
|
|
{ },
|
|
};
|
|
#endif
|
|
|
|
#ifdef CONFIG_OF
|
|
static const struct of_device_id ccp_of_match[] = {
|
|
{ .compatible = "amd,ccp-seattle-v1a" },
|
|
{ },
|
|
};
|
|
#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);
|
|
}
|