Add support for ACPI to the CCP platform driver.
Signed-off-by: Tom Lendacky <thomas.lendacky@xxxxxxx>
---
drivers/crypto/Kconfig | 2 -
drivers/crypto/ccp/ccp-platform.c | 96 +++++++++++++++++++++++++++++++++++--
2 files changed, 93 insertions(+), 5 deletions(-)
diff --git a/drivers/crypto/Kconfig b/drivers/crypto/Kconfig
index b840b79..7e94413 100644
--- a/drivers/crypto/Kconfig
+++ b/drivers/crypto/Kconfig
@@ -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
diff --git a/drivers/crypto/ccp/ccp-platform.c b/drivers/crypto/ccp/ccp-platform.c
index 20661f0..b1c20b2 100644
--- a/drivers/crypto/ccp/ccp-platform.c
+++ b/drivers/crypto/ccp/ccp-platform.c
@@ -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,
--
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