1 // SPDX-License-Identifier: GPL-2.0-only
3  * FSI hub master driver
9 #include <linux/fsi.h>
14 #include "fsi-master.h"
21  * FSI hub master support
24  * primary FSI master can access. For each link a primary master supports,
28  * The hub is controlled by a set of control registers exposed as a regular fsi
29  * device (the hub->upstream device), and provides access to the downstream FSI
30  * bus as through an address range on the slave itself (->addr and ->size).
33  * bus entirely through the fsi device address range, and so have a smaller
39 	uint32_t		addr, size;	/* slave-relative addr of */
51 		return -EINVAL;  in hub_master_read()
53 	addr += hub->addr + (link * FSI_HUB_LINK_SIZE);  in hub_master_read()
54 	return fsi_slave_read(hub->upstream->slave, addr, val, size);  in hub_master_read()
63 		return -EINVAL;  in hub_master_write()
65 	addr += hub->addr + (link * FSI_HUB_LINK_SIZE);  in hub_master_write()
66 	return fsi_slave_write(hub->upstream->slave, addr, val, size);  in hub_master_write()
94 		return fsi_device_write(hub->upstream, FSI_MCENP0 + (4 * idx),  in hub_master_link_enable()
97 	rc = fsi_device_write(hub->upstream, FSI_MSENP0 + (4 * idx), &reg, 4);  in hub_master_link_enable()
126 	struct fsi_device *dev = hub->upstream;  in hub_master_init()
136 	/* Initialize the MFSI (hub master) engine */  in hub_master_init()
211 	rc = fsi_slave_claim_range(fsi_dev->slave, FSI_HUB_LINK_OFFSET,  in hub_master_probe()
214 		dev_err(dev, "can't claim slave address range for links");  in hub_master_probe()
220 		rc = -ENOMEM;  in hub_master_probe()
224 	hub->addr = FSI_HUB_LINK_OFFSET;  in hub_master_probe()
225 	hub->size = FSI_HUB_LINK_SIZE * links;  in hub_master_probe()
226 	hub->upstream = fsi_dev;  in hub_master_probe()
228 	hub->master.dev.parent = dev;  in hub_master_probe()
229 	hub->master.dev.release = hub_master_release;  in hub_master_probe()
230 	hub->master.dev.of_node = of_node_get(dev_of_node(dev));  in hub_master_probe()
232 	hub->master.n_links = links;  in hub_master_probe()
233 	hub->master.read = hub_master_read;  in hub_master_probe()
234 	hub->master.write = hub_master_write;  in hub_master_probe()
235 	hub->master.send_break = hub_master_break;  in hub_master_probe()
236 	hub->master.link_enable = hub_master_link_enable;  in hub_master_probe()
242 	rc = fsi_master_register(&hub->master);  in hub_master_probe()
248 	 * will be freed (via ->release) during any subsequent call to  in hub_master_probe()
253 	get_device(&hub->master.dev);  in hub_master_probe()
257 	fsi_slave_release_range(fsi_dev->slave, FSI_HUB_LINK_OFFSET,  in hub_master_probe()
266 	fsi_master_unregister(&hub->master);  in hub_master_remove()
267 	fsi_slave_release_range(hub->upstream->slave, hub->addr, hub->size);  in hub_master_remove()
268 	of_node_put(hub->master.dev.of_node);  in hub_master_remove()
271 	 * master.dev will likely be ->release()ed after this, which free()s  in hub_master_remove()
274 	put_device(&hub->master.dev);  in hub_master_remove()
290 		.name = "fsi-master-hub",
298 MODULE_DESCRIPTION("FSI hub master driver");