ti: k3: drivers: ti_sci: Add support for Core control

Since system controller now has control over SoC power management, core
operation such as reset need to be explicitly requested to reboot the SoC.
Add support for this here.
Signed-off-by: Andrew F. Davis <afd@ti.com>
Reviewed-by: Andreas Dannenberg <dannenberg@ti.com>

plat/ti/k3/common/drivers/ti_sci/ti_sci.c

@@ -1117,6 +1117,41 @@ int ti_sci_clock_get_freq(uint32_t dev_id, uint8_t clk_id, uint64_t *freq)
 	return 0;
 }
 
+/**
+ * ti_sci_core_reboot() - Command to request system reset
+ *
+ * Return: 0 if all goes well, else appropriate error message
+ */
+int ti_sci_core_reboot(void)
+{
+	struct ti_sci_msg_req_reboot req;
+	struct ti_sci_msg_hdr resp;
+
+	struct ti_sci_xfer xfer;
+	int ret;
+
+	ret = ti_sci_setup_one_xfer(TI_SCI_MSG_SYS_RESET,
+				    TI_SCI_FLAG_REQ_ACK_ON_PROCESSED,
+				    &req, sizeof(req),
+				    &resp, sizeof(resp),
+				    &xfer);
+	if (ret) {
+		ERROR("Message alloc failed (%d)\n", ret);
+		return ret;
+	}
+
+	ret = ti_sci_do_xfer(&xfer);
+	if (ret) {
+		ERROR("Transfer send failed (%d)\n", ret);
+		return ret;
+	}
+
+	if (!ti_sci_is_response_ack(&resp))
+		return -ENODEV;
+
+	return 0;
+}
+
 /**
  * ti_sci_init() - Basic initialization
  *

plat/ti/k3/common/drivers/ti_sci/ti_sci.h

@@ -152,6 +152,15 @@ int ti_sci_clock_set_freq(uint32_t dev_id, uint8_t clk_id,
 			  uint64_t max_freq);
 int ti_sci_clock_get_freq(uint32_t dev_id, uint8_t clk_id, uint64_t *freq);
 
+/**
+ * Core control operations
+ *
+ * - ti_sci_core_reboot() - Command to request system reset
+ *
+ * Return: 0 if all went well, else returns appropriate error value.
+ */
+int ti_sci_core_reboot(void);
+
 /**
  * ti_sci_init() - Basic initialization
  *