Commit 6c506343 authored by Tom Lendacky's avatar Tom Lendacky Committed by Herbert Xu
Browse files

crypto: ccp - Add ACPI support 



Add support for ACPI to the CCP platform driver.

Signed-off-by: default avatarTom Lendacky <thomas.lendacky@amd.com>
Signed-off-by: default avatarHerbert Xu <herbert@gondor.apana.org.au>
parent be03a3a0

drivers/crypto/Kconfig

+1 −1
Original line number Diff line number Diff line
@@ -391,7 +391,7 @@ config CRYPTO_DEV_ATMEL_SHA 


config CRYPTO_DEV_CCP

	bool "Support for AMD Cryptographic Coprocessor"

	depends on ((X86 && PCI) || ARM64) && HAS_IOMEM

	depends on ((X86 && PCI) || (ARM64 && (OF_ADDRESS || ACPI))) && HAS_IOMEM

	default n

	help

	  The AMD Cryptographic Coprocessor provides hardware support

drivers/crypto/ccp/ccp-platform.c

+92 −4
Original line number Diff line number Diff line
@@ -23,9 +23,16 @@ 
#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;
@@ -83,10 +90,64 @@ static struct resource *ccp_find_mmio_area(struct ccp_device *ccp) 
	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;
@@ -95,10 +156,16 @@ static int ccp_platform_probe(struct platform_device *pdev) 
	if (!ccp)

		goto e_err;



	ccp->dev_specific = NULL;

	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)) {
@@ -115,7 +182,14 @@ static int ccp_platform_probe(struct platform_device *pdev) 
		goto e_err;

	}



	if (of_property_read_bool(dev->of_node, "dma-coherent"))

	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;
@@ -197,15 +271,29 @@ static int ccp_platform_resume(struct platform_device *pdev) 
}

#endif



static const struct of_device_id ccp_platform_ids[] = {

#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",

		.of_match_table = ccp_platform_ids,

#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,