firmware: ti_sci: Add support for IRQ management

TISCI abstracts the handling of IRQ routes where interrupt sources
are not directly connected to host interrupt controller. Add support
for the set of TISCI commands for requesting and releasing IRQs.
Signed-off-by: Lokesh Vutla <lokeshvutla@ti.com>
Acked-by: Nishanth Menon <nm@ti.com>
Signed-off-by: Marc Zyngier <marc.zyngier@arm.com>

drivers/firmware/ti_sci.h

@@ -38,6 +38,10 @@
 /* Resource Management Requests */
 #define TI_SCI_MSG_GET_RESOURCE_RANGE	0x1500
 
+/* IRQ requests */
+#define TI_SCI_MSG_SET_IRQ		0x1000
+#define TI_SCI_MSG_FREE_IRQ		0x1001
+
 /**
  * struct ti_sci_msg_hdr - Generic Message Header for All messages and responses
  * @type:	Type of messages: One of TI_SCI_MSG* values
@@ -503,4 +507,60 @@ struct ti_sci_msg_resp_get_resource_range {
 	u16 range_num;
 } __packed;
 
+/**
+ * struct ti_sci_msg_req_manage_irq - Request to configure/release the route
+ *					between the dev and the host.
+ * @hdr:		Generic Header
+ * @valid_params:	Bit fields defining the validity of interrupt source
+ *			parameters. If a bit is not set, then corresponding
+ *			field is not valid and will not be used for route set.
+ *			Bit field definitions:
+ *			0 - Valid bit for @dst_id
+ *			1 - Valid bit for @dst_host_irq
+ *			2 - Valid bit for @ia_id
+ *			3 - Valid bit for @vint
+ *			4 - Valid bit for @global_event
+ *			5 - Valid bit for @vint_status_bit_index
+ *			31 - Valid bit for @secondary_host
+ * @src_id:		IRQ source peripheral ID.
+ * @src_index:		IRQ source index within the peripheral
+ * @dst_id:		IRQ Destination ID. Based on the architecture it can be
+ *			IRQ controller or host processor ID.
+ * @dst_host_irq:	IRQ number of the destination host IRQ controller
+ * @ia_id:		Device ID of the interrupt aggregator in which the
+ *			vint resides.
+ * @vint:		Virtual interrupt number if the interrupt route
+ *			is through an interrupt aggregator.
+ * @global_event:	Global event that is to be mapped to interrupt
+ *			aggregator virtual interrupt status bit.
+ * @vint_status_bit:	Virtual interrupt status bit if the interrupt route
+ *			utilizes an interrupt aggregator status bit.
+ * @secondary_host:	Host ID of the IRQ destination computing entity. This is
+ *			required only when destination host id is different
+ *			from ti sci interface host id.
+ *
+ * Request type is TI_SCI_MSG_SET/RELEASE_IRQ.
+ * Response is generic ACK / NACK message.
+ */
+struct ti_sci_msg_req_manage_irq {
+	struct ti_sci_msg_hdr hdr;
+#define MSG_FLAG_DST_ID_VALID			TI_SCI_MSG_FLAG(0)
+#define MSG_FLAG_DST_HOST_IRQ_VALID		TI_SCI_MSG_FLAG(1)
+#define MSG_FLAG_IA_ID_VALID			TI_SCI_MSG_FLAG(2)
+#define MSG_FLAG_VINT_VALID			TI_SCI_MSG_FLAG(3)
+#define MSG_FLAG_GLB_EVNT_VALID			TI_SCI_MSG_FLAG(4)
+#define MSG_FLAG_VINT_STS_BIT_VALID		TI_SCI_MSG_FLAG(5)
+#define MSG_FLAG_SHOST_VALID			TI_SCI_MSG_FLAG(31)
+	u32 valid_params;
+	u16 src_id;
+	u16 src_index;
+	u16 dst_id;
+	u16 dst_host_irq;
+	u16 ia_id;
+	u16 vint;
+	u16 global_event;
+	u8 vint_status_bit;
+	u8 secondary_host;
+} __packed;
+
 #endif /* __TI_SCI_H */

include/linux/soc/ti/ti_sci_protocol.h

@@ -217,17 +217,43 @@ struct ti_sci_rm_core_ops {
 				    u16 *range_start, u16 *range_num);
 };
 
+/**
+ * struct ti_sci_rm_irq_ops: IRQ management operations
+ * @set_irq:		Set an IRQ route between the requested source
+ *			and destination
+ * @set_event_map:	Set an Event based peripheral irq to Interrupt
+ *			Aggregator.
+ * @free_irq:		Free an an IRQ route between the requested source
+ *			destination.
+ * @free_event_map:	Free an event based peripheral irq to Interrupt
+ *			Aggregator.
+ */
+struct ti_sci_rm_irq_ops {
+	int (*set_irq)(const struct ti_sci_handle *handle, u16 src_id,
+		       u16 src_index, u16 dst_id, u16 dst_host_irq);
+	int (*set_event_map)(const struct ti_sci_handle *handle, u16 src_id,
+			     u16 src_index, u16 ia_id, u16 vint,
+			     u16 global_event, u8 vint_status_bit);
+	int (*free_irq)(const struct ti_sci_handle *handle, u16 src_id,
+			u16 src_index, u16 dst_id, u16 dst_host_irq);
+	int (*free_event_map)(const struct ti_sci_handle *handle, u16 src_id,
+			      u16 src_index, u16 ia_id, u16 vint,
+			      u16 global_event, u8 vint_status_bit);
+};
+
 /**
  * struct ti_sci_ops - Function support for TI SCI
  * @dev_ops:	Device specific operations
  * @clk_ops:	Clock specific operations
  * @rm_core_ops:	Resource management core operations.
+ * @rm_irq_ops:		IRQ management specific operations
  */
 struct ti_sci_ops {
 	struct ti_sci_core_ops core_ops;
 	struct ti_sci_dev_ops dev_ops;
 	struct ti_sci_clk_ops clk_ops;
 	struct ti_sci_rm_core_ops rm_core_ops;
+	struct ti_sci_rm_irq_ops rm_irq_ops;
 };
 
 /**