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Subject[RFC PATCH 3/5] firmware: xilinx: Add ZynqMP aes API for AES functionality
Date
Add ZynqMP firmware AES API to perform encryption/decryption
of given data.

Signed-off-by: Kalyani Akula <kalyani.akula@xilinx.com>
---
drivers/firmware/xilinx/zynqmp.c | 24 ++++++++++++++++++++++++
include/linux/firmware/xlnx-zynqmp.h | 2 ++
2 files changed, 26 insertions(+)

diff --git a/drivers/firmware/xilinx/zynqmp.c b/drivers/firmware/xilinx/zynqmp.c
index 9a1c72a..332f98c1 100644
--- a/drivers/firmware/xilinx/zynqmp.c
+++ b/drivers/firmware/xilinx/zynqmp.c
@@ -469,6 +469,29 @@ static int zynqmp_pm_ioctl(u32 node_id, u32 ioctl_id, u32 arg1, u32 arg2,
arg1, arg2, out);
}

+/**
+ * zynqmp_pm_aes - Access AES hardware to encrypt/decrypt the data using
+ * AES-GCM core.
+ * @address: Address of the AesParams structure.
+ * @out: Returned output value
+ *
+ * Return: Returns status, either success or error code.
+ */
+static int zynqmp_pm_aes_engine(const u64 address, u32 *out)
+{
+ u32 ret_payload[PAYLOAD_ARG_CNT];
+ int ret;
+
+ if (!out)
+ return -EINVAL;
+
+ ret = zynqmp_pm_invoke_fn(PM_SECURE_AES, upper_32_bits(address),
+ lower_32_bits(address),
+ 0, 0, ret_payload);
+ *out = ret_payload[1];
+ return ret;
+}
+
static const struct zynqmp_eemi_ops eemi_ops = {
.get_api_version = zynqmp_pm_get_api_version,
.query_data = zynqmp_pm_query_data,
@@ -482,6 +505,7 @@ static int zynqmp_pm_ioctl(u32 node_id, u32 ioctl_id, u32 arg1, u32 arg2,
.clock_setparent = zynqmp_pm_clock_setparent,
.clock_getparent = zynqmp_pm_clock_getparent,
.ioctl = zynqmp_pm_ioctl,
+ .aes = zynqmp_pm_aes_engine,
};

/**
diff --git a/include/linux/firmware/xlnx-zynqmp.h b/include/linux/firmware/xlnx-zynqmp.h
index 3c3c28e..815fa30 100644
--- a/include/linux/firmware/xlnx-zynqmp.h
+++ b/include/linux/firmware/xlnx-zynqmp.h
@@ -45,6 +45,7 @@ enum pm_api_id {
PM_CLOCK_GETRATE,
PM_CLOCK_SETPARENT,
PM_CLOCK_GETPARENT,
+ PM_SECURE_AES = 47,
};

/* PMU-FW return status codes */
@@ -102,6 +103,7 @@ struct zynqmp_eemi_ops {
int (*clock_setparent)(u32 clock_id, u32 parent_id);
int (*clock_getparent)(u32 clock_id, u32 *parent_id);
int (*ioctl)(u32 node_id, u32 ioctl_id, u32 arg1, u32 arg2, u32 *out);
+ int (*aes)(const u64 address, u32 *out);
};

#if IS_REACHABLE(CONFIG_ARCH_ZYNQMP)
--
1.9.5
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