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 */
 45struct 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 otg_transceiver *transceiver;
 86
 87	/* Current usb protocol used: 0:undefine; 1:host; 2:client */
 88	int protocol;
 89	spinlock_t lock;
 90};
 91
 92struct 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
105static inline void otg_chrg_vbus(struct otg_fsm *fsm, int on)
106{
107	fsm->ops->chrg_vbus(on);
108}
109
110static 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
118static 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
126static 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
134static inline void otg_start_pulse(struct otg_fsm *fsm)
135{
136	fsm->ops->start_pulse();
137}
138
139static inline void otg_add_timer(struct otg_fsm *fsm, void *timer)
140{
141	fsm->ops->add_timer(timer);
142}
143
144static inline void otg_del_timer(struct otg_fsm *fsm, void *timer)
145{
146	fsm->ops->del_timer(timer);
147}
148
149int otg_statemachine(struct otg_fsm *fsm);
150
151/* Defined by device specific driver, for different timer implementation */
152extern 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;