plat: xilinx: zynqmp: Add GET_CALLBACK_DATA function

Add GET_CALLBACK_DATA function again as now Linux driver
supports both mailbox as well as ISR method.
Signed-off-by: Rajan Vaja <rajan.vaja@xilinx.com>
Signed-off-by: Jolly Shah <jolly.shah@xilinx.com>
Change-Id: Ieb99d61976e1cb718fcd1021d9cf4958e7556c81

plat/xilinx/zynqmp/pm_service/pm_api_sys.c

 /*
- * Copyright (c) 2013-2018, ARM Limited and Contributors. All rights reserved.
+ * Copyright (c) 2013-2020, ARM Limited and Contributors. All rights reserved.
  *
  * SPDX-License-Identifier: BSD-3-Clause
  */
@@ -629,6 +629,22 @@ enum pm_ret_status pm_aes_engine(uint32_t address_high,
 	return pm_ipi_send_sync(primary_proc, payload, value, 1);
 }
 
+/**
+ * pm_get_callbackdata() - Read from IPI response buffer
+ * @data - array of PAYLOAD_ARG_CNT elements
+ *
+ * Read value from ipi buffer response buffer.
+ */
+void pm_get_callbackdata(uint32_t *data, size_t count)
+{
+	/* Return if interrupt is not from PMU */
+	if (!pm_ipi_irq_status(primary_proc))
+		return;
+
+	pm_ipi_buff_read_callb(data, count);
+	pm_ipi_irq_clear(primary_proc);
+}
+
 /**
  * pm_pinctrl_request() - Request Pin from firmware
  * @pin		Pin number to request

plat/xilinx/zynqmp/pm_service/pm_api_sys.h

 /*
- * Copyright (c) 2013-2018, ARM Limited and Contributors. All rights reserved.
+ * Copyright (c) 2013-2020, ARM Limited and Contributors. All rights reserved.
  *
  * SPDX-License-Identifier: BSD-3-Clause
  */
@@ -116,6 +116,7 @@ enum pm_ret_status pm_secure_rsaaes(uint32_t address_high,
 				    uint32_t size,
 				    uint32_t flags);
 unsigned int pm_get_shutdown_scope(void);
+void pm_get_callbackdata(uint32_t *data, size_t count);
 enum pm_ret_status pm_pinctrl_request(unsigned int pin);
 enum pm_ret_status pm_pinctrl_release(unsigned int pin);
 enum pm_ret_status pm_pinctrl_get_function(unsigned int pin,

plat/xilinx/zynqmp/pm_service/pm_svc_main.c

 /*
- * Copyright (c) 2013-2018, ARM Limited and Contributors. All rights reserved.
+ * Copyright (c) 2013-2020, ARM Limited and Contributors. All rights reserved.
  *
  * SPDX-License-Identifier: BSD-3-Clause
  */
@@ -25,6 +25,7 @@
 #include "pm_client.h"
 #include "pm_ipi.h"
 
+#define PM_GET_CALLBACK_DATA	0xa01
 #define PM_SET_SUSPEND_MODE	0xa02
 #define PM_GET_TRUSTZONE_VERSION	0xa03
 
@@ -412,6 +413,16 @@ uint64_t pm_smc_handler(uint32_t smc_fid, uint64_t x1, uint64_t x2, uint64_t x3,
 				       pm_arg[3]);
 		SMC_RET1(handle, (uint64_t)ret);
 
+	case PM_GET_CALLBACK_DATA:
+	{
+		uint32_t result[4] = {0};
+
+		pm_get_callbackdata(result, (sizeof(result)/sizeof(uint32_t)));
+		SMC_RET2(handle,
+			 (uint64_t)result[0] | ((uint64_t)result[1] << 32),
+			 (uint64_t)result[2] | ((uint64_t)result[3] << 32));
+	}
+
 	case PM_PINCTRL_REQUEST:
 		ret = pm_pinctrl_request(pm_arg[0]);
 		SMC_RET1(handle, (uint64_t)ret);