firmware/arm_scmi/driver.c

3  * System Control and Management Interface (SCMI) Message Protocol driver
5  * SCMI Message Protocol is used between the System Control Processor(SCP)
44 #include <trace/events/scmi.h>
50 /* List of all SCMI devices active in system */
83  * @handle: Reference to the SCMI handle associated to this protocol instance.
98  * Each protocol is initialized independently once for each SCMI platform in
99  * which is defined by DT and implemented by the SCMI server fw.
117  * @name: Name of this SCMI instance
118  * @type: Type of this SCMI instance
131  * struct scmi_info - Structure representing a SCMI instance
136  * @version: SCMI revision information containing protocol version,
138  * @handle: Instance of SCMI handle to send to clients
144  *	       this SCMI instance: populated on protocol's first attempted
154  *		      Only SCMI synchronous commands reported by the platform
157  *		      decision is finally left up to the SCMI drivers.
161  * @bus_nb: A notifier to listen for device bind/unbind on the scmi bus
162  * @dev_req_nb: A notifier to listen for device request/unrequest on the scmi
164  * @devreq_mtx: A mutex to serialize device creation for this SCMI instance
166  * @raw: An opaque reference handle used by SCMI Raw mode.
298 		pr_warn("SCMI Protocol 0x%x not found!\n", protocol_id);  in scmi_protocol_get()
302 	pr_debug("Found SCMI Protocol 0x%x\n", protocol_id);  in scmi_protocol_get()
305 		pr_info("Loaded SCMI Vendor Protocol 0x%x - %s %s %X\n",  in scmi_protocol_get()
371 		pr_err("unable to allocate SCMI protocol slot for 0x%x - err %d\n",  in scmi_protocol_register()
376 	pr_debug("Registered SCMI Protocol 0x%x\n", proto->id);  in scmi_protocol_register()
394 	pr_debug("Unregistered SCMI Protocol 0x%x\n", proto->id);  in scmi_protocol_unregister()
400  * this SCMI instance.
403  * @info: The SCMI instance descriptor
622  * @handle: Pointer to SCMI entity handle
663  * @handle: Pointer to SCMI entity handle
713  * @handle: Pointer to SCMI entity handle
735  * @handle: Pointer to SCMI entity handle
738  * Note that in a regular SCMI stack, usually, a protocol has to be defined in
798  * @handle: Pointer to SCMI entity handle
888  * SCMI transport can deliver such out-of-order responses.
1176  * @cinfo: SCMI channel info
1209  * @ph: Pointer to SCMI protocol handle
1312  * @cinfo: SCMI channel info
1339  * @cinfo: SCMI channel info
1364  * @ph: Pointer to SCMI protocol handle
1462  * @ph: Pointer to SCMI protocol handle
1517  * @ph: Pointer to SCMI protocol handle
1573  * version_get() - command to get the revision of the SCMI entity
1575  * @ph: Pointer to SCMI protocol handle
1578  * Updates the SCMI information in the internal data structure.
2032  * A helper to grab the version memory area reference during SCMI Base protocol
2035  * Return: A reference to the version memory area associated to the SCMI
2087  * @info: The reference to the related SCMI instance.
2091  * description, against the specified SCMI instance @info, and initialize it;
2184  * @handle: A reference to the SCMI platform instance.
2223  * @handle: A reference to the SCMI platform instance.
2226  * Register a new user for the requested protocol on the specified SCMI
2238  * @handle: A reference to the SCMI platform instance.
2349  * released, and possibly de-initialized on last user, once the SCMI driver
2384  * released, and possibly de-initialized on last user, once the SCMI driver
2431  * SCMI instance is configured as atomic.
2433  * @handle: A reference to the SCMI platform instance.
2454  * scmi_handle_get() - Get the SCMI handle for a device
2456  * @dev: pointer to device for which we want SCMI handle
2459  * and is expected to be maintained by caller of SCMI protocol library.
2490  * and is expected to be maintained by caller of SCMI protocol library.
2686 			"unable to allocate SCMI idr slot err %d\n", ret);  in scmi_chan_setup()
2723  * @info: The SCMI instance descriptor.
2727  * borrowing devices from the SCMI drivers; this way channels are initialized
2728  * upfront during core SCMI stack probing and are no more coupled with SCMI
2729  * devices used by SCMI drivers.
2808 	/* Skip transport devices and devices of different SCMI instances */  in scmi_bus_notifier()
3009 				 "SCMI RAW - Error enumerating channels\n");  in scmi_debugfs_raw_mode_setup()
3023 		dev_err(info->dev, "Failed to initialize SCMI RAW Mode !\n");  in scmi_debugfs_raw_mode_setup()
3056 	dev_info(dev, "SCMI max-rx-timeout: %dms\n",  in scmi_transport_setup()
3113 			 "SCMI System wide atomic threshold set to %d us\n",  in scmi_probe()
3146 			dev_warn(dev, "Failed to setup SCMI debugfs.\n");  in scmi_probe()
3159 			dev_info(dev, "SCMI RAW Mode COEX enabled !\n");  in scmi_probe()
3164 		dev_err(dev, "SCMI Notifications NOT available.\n");  in scmi_probe()
3172 	 * Trigger SCMI Base protocol initialization.  in scmi_probe()
3174 	 * SCMI stack is shutdown/unloaded as a whole.  in scmi_probe()
3178 		err_str = "unable to communicate with SCMI\n";  in scmi_probe()
3200 			dev_err(dev, "SCMI protocol %d not implemented\n",  in scmi_probe()
3207 		 * @active_protocols for this SCMI instance/  in scmi_probe()
3212 			dev_err(dev, "SCMI protocol %d already activated. Skip\n",  in scmi_probe()
3253 			 "Still active SCMI users will be forcibly unbound.\n");  in scmi_remove()
3325 		   .name = "arm-scmi",
3337 	d = debugfs_create_dir("scmi", NULL);  in scmi_debugfs_init()
3339 		pr_err("Could NOT create SCMI top dentry.\n");  in scmi_debugfs_init()
3348 	/* Bail out if no SCMI transport was configured */  in scmi_driver_init()
3397 MODULE_ALIAS("platform:arm-scmi");
3399 MODULE_DESCRIPTION("ARM SCMI protocol driver");