zynqmp:pm: Adds new zynqmp-pm api SMC call for efuse

This patch adds new api to access zynqmp efuse memory
Signed-off-by: VNSL Durga <vnsl.durga.challa@xilinx.com>
Signed-off-by: Rajan Vaja <rajan.vaja@xilinx.com>
Change-Id: I0971ab6549552a6f96412431388d19b822db00ab

plat/xilinx/zynqmp/pm_service/pm_api_sys.c

@@ -1591,3 +1591,29 @@ enum pm_ret_status pm_register_access(unsigned int register_access_id,
 	}
 	return ret;
 }
+
+/**
+ * pm_efuse_access() - To program or read efuse bits.
+ *
+ * This function provides access to the xilskey library to program/read
+ * efuse bits.
+ *
+ * address_low: lower 32-bit Linear memory space address
+ * address_high: higher 32-bit Linear memory space address
+ *
+ * value: Returned output value
+ *
+ * @return  Returns status, either success or error+reason
+ *
+ */
+enum pm_ret_status pm_efuse_access(uint32_t address_high,
+				   uint32_t address_low,
+				   uint32_t *value)
+{
+	uint32_t payload[PAYLOAD_ARG_CNT];
+
+	/* Send request to the PMU */
+	PM_PACK_PAYLOAD3(payload, PM_EFUSE_ACCESS, address_high, address_low);
+
+	return pm_ipi_send_sync(primary_proc, payload, value, 1);
+}

plat/xilinx/zynqmp/pm_service/pm_api_sys.h

@@ -196,5 +196,7 @@ enum pm_ret_status pm_pll_get_parameter(enum pm_node_id nid,
 
 enum pm_ret_status pm_pll_set_mode(enum pm_node_id nid, enum pm_pll_mode mode);
 enum pm_ret_status pm_pll_get_mode(enum pm_node_id nid, enum pm_pll_mode *mode);
+enum pm_ret_status pm_efuse_access(uint32_t address_high,
+				   uint32_t address_low, uint32_t *value);
 
 #endif /* PM_API_SYS_H */

plat/xilinx/zynqmp/pm_service/pm_defs.h

@@ -99,6 +99,7 @@ enum pm_api_id {
 	PM_PLL_GET_MODE,
 	/* PM Register Access API */
 	PM_REGISTER_ACCESS,
+	PM_EFUSE_ACCESS,
 	PM_API_MAX
 };
 

plat/xilinx/zynqmp/pm_service/pm_svc_main.c

@@ -615,6 +615,14 @@ uint64_t pm_smc_handler(uint32_t smc_fid, uint64_t x1, uint64_t x2, uint64_t x3,
 		SMC_RET1(handle, (uint64_t)ret | ((uint64_t)value) << 32);
 	}
 
+	case PM_EFUSE_ACCESS:
+	{
+		uint32_t value;
+
+		ret = pm_efuse_access(pm_arg[0], pm_arg[1], &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);