[RFC PATCH V3 2/4] firmware: xilinx: Add ZynqMP sha_hash API for SHA3 functionality

[Kalyani Akula <kalyani.akula@xilinx.com>]

Add ZynqMP firmware SHA_HASH API to compute SHA3 hash of given data.

Signed-off-by: Kalyani Akula <kalyani.akula@xilinx.com>
---
 drivers/firmware/xilinx/zynqmp.c     | 27 +++++++++++++++++++++++++++
 include/linux/firmware/xlnx-zynqmp.h |  2 ++
 2 files changed, 29 insertions(+)

diff --git a/drivers/firmware/xilinx/zynqmp.c b/drivers/firmware/xilinx/zynqmp.c
index 98f9361..22a062a 100644
--- a/drivers/firmware/xilinx/zynqmp.c
+++ b/drivers/firmware/xilinx/zynqmp.c
@@ -619,9 +619,36 @@ static int zynqmp_pm_set_requirement(const u32 node, const u32 capabilities,
 				   qos, ack, NULL);
 }
 
+/**
+ * zynqmp_pm_sha_hash - Access the SHA engine to calculate the hash
+ * @address:	Address of the data/ Address of output buffer where
+ *		hash should be stored.
+ * @size:	Size of the data.
+ * @flags:
+ *	BIT(0) - for initializing csudma driver and SHA3(Here address
+ *		 and size inputs can be NULL).
+ *	BIT(1) - to call Sha3_Update API which can be called multiple
+ *		 times when data is not contiguous.
+ *	BIT(2) - to get final hash of the whole updated data.
+ *		 Hash will be overwritten at provided address with
+ *		 48 bytes.
+ *
+ * Return:	Returns status, either success or error code.
+ */
+static int zynqmp_pm_sha_hash(const u64 address, const u32 size,
+			      const u32 flags)
+{
+	u32 lower_32_bits = (u32)address;
+	u32 upper_32_bits = (u32)(address >> 32);
+
+	return zynqmp_pm_invoke_fn(PM_SECURE_SHA, upper_32_bits, lower_32_bits,
+				   size, flags, NULL);
+}
+
 static const struct zynqmp_eemi_ops eemi_ops = {
 	.get_api_version = zynqmp_pm_get_api_version,
 	.get_chipid = zynqmp_pm_get_chipid,
+	.sha_hash = zynqmp_pm_sha_hash,
 	.query_data = zynqmp_pm_query_data,
 	.clock_enable = zynqmp_pm_clock_enable,
 	.clock_disable = zynqmp_pm_clock_disable,
diff --git a/include/linux/firmware/xlnx-zynqmp.h b/include/linux/firmware/xlnx-zynqmp.h
index 642dab1..124e5f0 100644
--- a/include/linux/firmware/xlnx-zynqmp.h
+++ b/include/linux/firmware/xlnx-zynqmp.h
@@ -57,6 +57,7 @@ enum pm_api_id {
 	PM_RESET_GET_STATUS,
 	PM_PM_INIT_FINALIZE = 21,
 	PM_GET_CHIPID = 24,
+	PM_SECURE_SHA = 26,
 	PM_IOCTL = 34,
 	PM_QUERY_DATA,
 	PM_CLOCK_ENABLE,
@@ -283,6 +284,7 @@ struct zynqmp_eemi_ops {
 			       const u32 capabilities,
 			       const u32 qos,
 			       const enum zynqmp_pm_request_ack ack);
+	int (*sha_hash)(const u64 address, const u32 size, const u32 flags);
 };
 
 int zynqmp_pm_invoke_fn(u32 pm_api_id, u32 arg0, u32 arg1,
-- 
1.9.5