[RFC PATCH 1/4] drivers: firmware: Add user encrypted key load API support

[Nava kishore Manne]

This patch adds user encrypted key load API to support
User key encrypted images loading use cases from Linux.

Signed-off-by: Nava kishore Manne <nava.manne@xxxxxxxxxx>
---
 drivers/firmware/xilinx/zynqmp.c     | 17 +++++++++++++++++
 include/linux/firmware/xlnx-zynqmp.h |  7 +++++++
 2 files changed, 24 insertions(+)

diff --git a/drivers/firmware/xilinx/zynqmp.c b/drivers/firmware/xilinx/zynqmp.c
index 15b138326ecc..2fa5687a75f8 100644
--- a/drivers/firmware/xilinx/zynqmp.c
+++ b/drivers/firmware/xilinx/zynqmp.c
@@ -787,6 +787,23 @@ int zynqmp_pm_fpga_load(const u64 address, const u32 size, const u32 flags)
 }
 EXPORT_SYMBOL_GPL(zynqmp_pm_fpga_load);
 
+/**
+ * zynqmp_pm_fpga_key_load - Perform to load the bitstream encrypted key
+ * @address:    Address to write
+ * @size:       encrypted key size
+ *
+ * This function provides access to pmufw. To transfer
+ * the required encrypted key.
+ *
+ * Return: Returns status, either success or error+reason
+ */
+int zynqmp_pm_fpga_enc_key_load(const u64 address, const u32 size)
+{
+	return zynqmp_pm_invoke_fn(PM_ENC_KEY_LOAD, lower_32_bits(address),
+				   upper_32_bits(address), size, 0, NULL);
+}
+EXPORT_SYMBOL_GPL(zynqmp_pm_fpga_enc_key_load);
+
 /**
  * zynqmp_pm_fpga_get_status - Read value from PCAP status register
  * @value: Value to read
diff --git a/include/linux/firmware/xlnx-zynqmp.h b/include/linux/firmware/xlnx-zynqmp.h
index 9d1a5c175065..7aa9ad40ff53 100644
--- a/include/linux/firmware/xlnx-zynqmp.h
+++ b/include/linux/firmware/xlnx-zynqmp.h
@@ -91,6 +91,7 @@ enum pm_api_id {
 	PM_CLOCK_GETPARENT = 44,
 	PM_SECURE_AES = 47,
 	PM_FEATURE_CHECK = 63,
+	PM_ENC_KEY_LOAD = 64,
 };
 
 /* PMU-FW return status codes */
@@ -411,6 +412,7 @@ int zynqmp_pm_pinctrl_get_config(const u32 pin, const u32 param,
 				 u32 *value);
 int zynqmp_pm_pinctrl_set_config(const u32 pin, const u32 param,
 				 u32 value);
+int zynqmp_pm_fpga_enc_key_load(const u64 address, const u32 size);
 #else
 static inline int zynqmp_pm_get_api_version(u32 *version)
 {
@@ -622,6 +624,11 @@ static inline int zynqmp_pm_pinctrl_set_config(const u32 pin, const u32 param,
 {
 	return -ENODEV;
 }
+
+static inline int zynqmp_pm_fpga_enc_key_load(const u64 address, const u32 size)
+{
+	return -ENODEV;
+}
 #endif
 
 #endif /* __FIRMWARE_ZYNQMP_H__ */
-- 
2.17.1