zynqmp: Add new API for pl configuration readback

This patch adds new API's for performing pl configuration
readback.
Signed-off-by: Appana Durga Kedareswara rao <appana.durga.rao@xilinx.com>
Signed-off-by: Siva Durga Prasad Paladugu <siva.durga.paladugu@xilinx.com>

plat/xilinx/zynqmp/pm_service/pm_api_sys.c

@@ -1183,3 +1183,33 @@ enum pm_ret_status pm_secure_image(uint32_t address_low,
 			 key_hi, key_lo);
 	return pm_ipi_send_sync(primary_proc, payload, value, 2);
 }
+
+/**
+ * pm_fpga_read - Perform the fpga configuration readback
+ *
+ * @reg_numframes: Configuration register offset (or) Number of frames to read
+ * @address_low: lower 32-bit Linear memory space address
+ * @address_high: higher 32-bit Linear memory space address
+ * @readback_type: Type of fpga readback operation
+ *		   0 -- Configuration Register readback
+ *		   1 -- Configuration Data readback
+ * @value:	Value to read
+ *
+ * This function provides access to the xilfpga library to read
+ * the PL configuration.
+ *
+ * Return: Returns status, either success or error+reason.
+ */
+enum pm_ret_status pm_fpga_read(uint32_t reg_numframes,
+				uint32_t address_low,
+				uint32_t address_high,
+				uint32_t readback_type,
+				uint32_t *value)
+{
+	uint32_t payload[PAYLOAD_ARG_CNT];
+
+	/* Send request to the PMU */
+	PM_PACK_PAYLOAD5(payload, PM_FPGA_READ, reg_numframes, address_low,
+			 address_high, readback_type);
+	return pm_ipi_send_sync(primary_proc, payload, value, 1);
+}

plat/xilinx/zynqmp/pm_service/pm_api_sys.h

@@ -166,4 +166,11 @@ enum pm_ret_status pm_secure_image(uint32_t address_low,
 				   uint32_t key_lo,
 				   uint32_t key_hi,
 				   uint32_t *value);
+
+enum pm_ret_status pm_fpga_read(uint32_t reg_numframes,
+				uint32_t address_low,
+				uint32_t address_high,
+				uint32_t readback_type,
+				uint32_t *value);
+
 #endif /* _PM_API_SYS_H_ */

plat/xilinx/zynqmp/pm_service/pm_defs.h

@@ -89,6 +89,8 @@ enum pm_api_id {
 	PM_CLOCK_SETPARENT,
 	PM_CLOCK_GETPARENT,
 	PM_SECURE_IMAGE,
+	/* FPGA PL Readback */
+	PM_FPGA_READ,
 	PM_API_MAX
 };
 

plat/xilinx/zynqmp/pm_service/pm_svc_main.c

@@ -546,6 +546,15 @@ uint64_t pm_smc_handler(uint32_t smc_fid, uint64_t x1, uint64_t x2, uint64_t x3,
 			 result[1]);
 	}
 
+	case PM_FPGA_READ:
+	{
+		uint32_t value;
+
+		ret = pm_fpga_read(pm_arg[0], pm_arg[1], pm_arg[2], pm_arg[3],
+				   &value);
+		SMC_RET1(handle, (uint64_t)ret | ((uint64_t)value) << 32);
+	}
+
 	default:
 		WARN("Unimplemented PM Service Call: 0x%x\n", smc_fid);
 		SMC_RET1(handle, SMC_UNK);