1 /* SPDX-License-Identifier: GPL-2.0 */
2 /*
3  * Greybus Host Device
4  *
5  * Copyright 2014-2015 Google Inc.
6  * Copyright 2014-2015 Linaro Ltd.
7  */
8 
9 #ifndef __HD_H
10 #define __HD_H
11 
12 #include <linux/types.h>
13 #include <linux/device.h>
14 
15 struct gb_host_device;
16 struct gb_message;
17 
18 struct gb_hd_driver {
19 	size_t	hd_priv_size;
20 
21 	int (*cport_allocate)(struct gb_host_device *hd, int cport_id,
22 				unsigned long flags);
23 	void (*cport_release)(struct gb_host_device *hd, u16 cport_id);
24 	int (*cport_enable)(struct gb_host_device *hd, u16 cport_id,
25 				unsigned long flags);
26 	int (*cport_disable)(struct gb_host_device *hd, u16 cport_id);
27 	int (*cport_connected)(struct gb_host_device *hd, u16 cport_id);
28 	int (*cport_flush)(struct gb_host_device *hd, u16 cport_id);
29 	int (*cport_shutdown)(struct gb_host_device *hd, u16 cport_id,
30 				u8 phase, unsigned int timeout);
31 	int (*cport_quiesce)(struct gb_host_device *hd, u16 cport_id,
32 				size_t peer_space, unsigned int timeout);
33 	int (*cport_clear)(struct gb_host_device *hd, u16 cport_id);
34 
35 	int (*message_send)(struct gb_host_device *hd, u16 dest_cport_id,
36 			struct gb_message *message, gfp_t gfp_mask);
37 	void (*message_cancel)(struct gb_message *message);
38 	int (*latency_tag_enable)(struct gb_host_device *hd, u16 cport_id);
39 	int (*latency_tag_disable)(struct gb_host_device *hd, u16 cport_id);
40 	int (*output)(struct gb_host_device *hd, void *req, u16 size, u8 cmd,
41 		      bool async);
42 };
43 
44 struct gb_host_device {
45 	struct device dev;
46 	int bus_id;
47 	const struct gb_hd_driver *driver;
48 
49 	struct list_head modules;
50 	struct list_head connections;
51 	struct ida cport_id_map;
52 
53 	/* Number of CPorts supported by the UniPro IP */
54 	size_t num_cports;
55 
56 	/* Host device buffer constraints */
57 	size_t buffer_size_max;
58 
59 	struct gb_svc *svc;
60 	/* Private data for the host driver */
61 	unsigned long hd_priv[0] __aligned(sizeof(s64));
62 };
63 #define to_gb_host_device(d) container_of(d, struct gb_host_device, dev)
64 
65 int gb_hd_cport_reserve(struct gb_host_device *hd, u16 cport_id);
66 void gb_hd_cport_release_reserved(struct gb_host_device *hd, u16 cport_id);
67 int gb_hd_cport_allocate(struct gb_host_device *hd, int cport_id,
68 					unsigned long flags);
69 void gb_hd_cport_release(struct gb_host_device *hd, u16 cport_id);
70 
71 struct gb_host_device *gb_hd_create(struct gb_hd_driver *driver,
72 					struct device *parent,
73 					size_t buffer_size_max,
74 					size_t num_cports);
75 int gb_hd_add(struct gb_host_device *hd);
76 void gb_hd_del(struct gb_host_device *hd);
77 void gb_hd_shutdown(struct gb_host_device *hd);
78 void gb_hd_put(struct gb_host_device *hd);
79 int gb_hd_output(struct gb_host_device *hd, void *req, u16 size, u8 cmd,
80 		 bool in_irq);
81 
82 int gb_hd_init(void);
83 void gb_hd_exit(void);
84 
85 #endif	/* __HD_H */
86