1 /* Copyright (C) 2007,2008 Freescale Semiconductor, Inc.
2 *
3 * This program is free software; you can redistribute it and/or modify it
4 * under the terms of the GNU General Public License as published by the
5 * Free Software Foundation; either version 2 of the License, or (at your
6 * option) any later version.
7 *
8 * This program is distributed in the hope that it will be useful, but
9 * WITHOUT ANY WARRANTY; without even the implied warranty of
10 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
11 * General Public License for more details.
12 *
13 * You should have received a copy of the GNU General Public License along
14 * with this program; if not, write to the Free Software Foundation, Inc.,
15 * 675 Mass Ave, Cambridge, MA 02139, USA.
16 */
17
18 #undef DEBUG
19 #undef VERBOSE
20
21 #ifdef DEBUG
22 #define DBG(fmt, args...) printk(KERN_DEBUG "[%s] " fmt , \
23 __func__, ## args)
24 #else
25 #define DBG(fmt, args...) do {} while (0)
26 #endif
27
28 #ifdef VERBOSE
29 #define VDBG DBG
30 #else
31 #define VDBG(stuff...) do {} while (0)
32 #endif
33
34 #ifdef VERBOSE
35 #define MPC_LOC printk("Current Location [%s]:[%d]\n", __FILE__, __LINE__)
36 #else
37 #define MPC_LOC do {} while (0)
38 #endif
39
40 #define PROTO_UNDEF (0)
41 #define PROTO_HOST (1)
42 #define PROTO_GADGET (2)
43
44 /* OTG state machine according to the OTG spec */
45 struct otg_fsm {
46 /* Input */
47 int a_bus_resume;
48 int a_bus_suspend;
49 int a_conn;
50 int a_sess_vld;
51 int a_srp_det;
52 int a_vbus_vld;
53 int b_bus_resume;
54 int b_bus_suspend;
55 int b_conn;
56 int b_se0_srp;
57 int b_sess_end;
58 int b_sess_vld;
59 int id;
60
61 /* Internal variables */
62 int a_set_b_hnp_en;
63 int b_srp_done;
64 int b_hnp_enable;
65
66 /* Timeout indicator for timers */
67 int a_wait_vrise_tmout;
68 int a_wait_bcon_tmout;
69 int a_aidl_bdis_tmout;
70 int b_ase0_brst_tmout;
71
72 /* Informative variables */
73 int a_bus_drop;
74 int a_bus_req;
75 int a_clr_err;
76 int a_suspend_req;
77 int b_bus_req;
78
79 /* Output */
80 int drv_vbus;
81 int loc_conn;
82 int loc_sof;
83
84 struct otg_fsm_ops *ops;
85 struct usb_otg *otg;
86
87 /* Current usb protocol used: 0:undefine; 1:host; 2:client */
88 int protocol;
89 spinlock_t lock;
90 };
91
92 struct otg_fsm_ops {
93 void (*chrg_vbus)(int on);
94 void (*drv_vbus)(int on);
95 void (*loc_conn)(int on);
96 void (*loc_sof)(int on);
97 void (*start_pulse)(void);
98 void (*add_timer)(void *timer);
99 void (*del_timer)(void *timer);
100 int (*start_host)(struct otg_fsm *fsm, int on);
101 int (*start_gadget)(struct otg_fsm *fsm, int on);
102 };
103
104
otg_chrg_vbus(struct otg_fsm * fsm,int on)105 static inline void otg_chrg_vbus(struct otg_fsm *fsm, int on)
106 {
107 fsm->ops->chrg_vbus(on);
108 }
109
otg_drv_vbus(struct otg_fsm * fsm,int on)110 static inline void otg_drv_vbus(struct otg_fsm *fsm, int on)
111 {
112 if (fsm->drv_vbus != on) {
113 fsm->drv_vbus = on;
114 fsm->ops->drv_vbus(on);
115 }
116 }
117
otg_loc_conn(struct otg_fsm * fsm,int on)118 static inline void otg_loc_conn(struct otg_fsm *fsm, int on)
119 {
120 if (fsm->loc_conn != on) {
121 fsm->loc_conn = on;
122 fsm->ops->loc_conn(on);
123 }
124 }
125
otg_loc_sof(struct otg_fsm * fsm,int on)126 static inline void otg_loc_sof(struct otg_fsm *fsm, int on)
127 {
128 if (fsm->loc_sof != on) {
129 fsm->loc_sof = on;
130 fsm->ops->loc_sof(on);
131 }
132 }
133
otg_start_pulse(struct otg_fsm * fsm)134 static inline void otg_start_pulse(struct otg_fsm *fsm)
135 {
136 fsm->ops->start_pulse();
137 }
138
otg_add_timer(struct otg_fsm * fsm,void * timer)139 static inline void otg_add_timer(struct otg_fsm *fsm, void *timer)
140 {
141 fsm->ops->add_timer(timer);
142 }
143
otg_del_timer(struct otg_fsm * fsm,void * timer)144 static inline void otg_del_timer(struct otg_fsm *fsm, void *timer)
145 {
146 fsm->ops->del_timer(timer);
147 }
148
149 int otg_statemachine(struct otg_fsm *fsm);
150
151 /* Defined by device specific driver, for different timer implementation */
152 extern struct fsl_otg_timer *a_wait_vrise_tmr, *a_wait_bcon_tmr,
153 *a_aidl_bdis_tmr, *b_ase0_brst_tmr, *b_se0_srp_tmr, *b_srp_fail_tmr,
154 *a_wait_enum_tmr;
155