plat: xilinx: versal: Add GET_CALLBACK_DATA function

Add GET_CALLBACK_DATA function to get IPI callback
data in Linux during init suspend callback.
Signed-off-by: Rajan Vaja <rajan.vaja@xilinx.com>
Signed-off-by: Jolly Shah <jolly.shah@xilinx.com>
Change-Id: Ieb60e561b5f656611f0702c43ba6a4296a012651

plat/xilinx/versal/pm_service/pm_api_sys.c

@@ -312,6 +312,22 @@ enum pm_ret_status pm_reset_get_status(uint32_t reset, uint32_t *status)
 	return pm_ipi_send_sync(primary_proc, payload, status, 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 a pin
  * @pin		Pin ID

plat/xilinx/versal/pm_service/pm_api_sys.h

@@ -36,6 +36,7 @@ enum pm_ret_status pm_set_requirement(uint32_t device_id, uint32_t capabilities,
 enum pm_ret_status pm_get_device_status(uint32_t device_id, uint32_t *response);
 enum pm_ret_status pm_reset_assert(uint32_t reset, bool assert);
 enum pm_ret_status pm_reset_get_status(uint32_t reset, uint32_t *status);
+void pm_get_callbackdata(uint32_t *data, size_t count);
 enum pm_ret_status pm_pinctrl_request(uint32_t pin);
 enum pm_ret_status pm_pinctrl_release(uint32_t pin);
 enum pm_ret_status pm_pinctrl_set_function(uint32_t pin, uint32_t function);

plat/xilinx/versal/pm_service/pm_svc_main.c

@@ -17,6 +17,7 @@
 #include "pm_client.h"
 #include "pm_ipi.h"
 
+#define PM_GET_CALLBACK_DATA		0xa01
 #define PM_GET_TRUSTZONE_VERSION	0xa03
 
 /* pm_up = true - UP, pm_up = false - DOWN */
@@ -163,6 +164,16 @@ uint64_t pm_smc_handler(uint32_t smc_fid, uint64_t x1, uint64_t x2, uint64_t x3,
 	case PM_INIT_FINALIZE:
 		SMC_RET1(handle, (uint64_t)PM_RET_SUCCESS);
 
+	case PM_GET_CALLBACK_DATA:
+	{
+		uint32_t result[4] = {0};
+
+		pm_get_callbackdata(result, sizeof(result));
+		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);