USB: add Freescale USB OTG Transceiver driver

Slightly reworked and cleaned up driver from Freescale LTIB
for MPC5121E. The driver has been ported to the current kernel,
proc interface "/proc/driver/fsl_usb2_otg" has been replaced by
sysfs interface.

Signed-off-by: Li Yang <leoli@freescale.com>
Signed-off-by: Anatolij Gustschin <agust@denx.de>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

drivers/usb/otg/otg_fsm.h

@@ -0,0 +1,154 @@
+/* Copyright (C) 2007,2008 Freescale Semiconductor, Inc.
+ *
+ * This program is free software; you can redistribute  it and/or modify it
+ * under  the terms of  the GNU General  Public License as published by the
+ * Free Software Foundation;  either version 2 of the  License, or (at your
+ * option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * General Public License for more details.
+ *
+ * You should have received a copy of the  GNU General Public License along
+ * with this program; if not, write  to the Free Software Foundation, Inc.,
+ * 675 Mass Ave, Cambridge, MA 02139, USA.
+ */
+
+#undef DEBUG
+#undef VERBOSE
+
+#ifdef DEBUG
+#define DBG(fmt, args...) printk(KERN_DEBUG "[%s]  " fmt , \
+				 __func__, ## args)
+#else
+#define DBG(fmt, args...)	do {} while (0)
+#endif
+
+#ifdef VERBOSE
+#define VDBG		DBG
+#else
+#define VDBG(stuff...)	do {} while (0)
+#endif
+
+#ifdef VERBOSE
+#define MPC_LOC printk("Current Location [%s]:[%d]\n", __FILE__, __LINE__)
+#else
+#define MPC_LOC do {} while (0)
+#endif
+
+#define PROTO_UNDEF	(0)
+#define PROTO_HOST	(1)
+#define PROTO_GADGET	(2)
+
+/* OTG state machine according to the OTG spec */
+struct otg_fsm {
+	/* Input */
+	int a_bus_resume;
+	int a_bus_suspend;
+	int a_conn;
+	int a_sess_vld;
+	int a_srp_det;
+	int a_vbus_vld;
+	int b_bus_resume;
+	int b_bus_suspend;
+	int b_conn;
+	int b_se0_srp;
+	int b_sess_end;
+	int b_sess_vld;
+	int id;
+
+	/* Internal variables */
+	int a_set_b_hnp_en;
+	int b_srp_done;
+	int b_hnp_enable;
+
+	/* Timeout indicator for timers */
+	int a_wait_vrise_tmout;
+	int a_wait_bcon_tmout;
+	int a_aidl_bdis_tmout;
+	int b_ase0_brst_tmout;
+
+	/* Informative variables */
+	int a_bus_drop;
+	int a_bus_req;
+	int a_clr_err;
+	int a_suspend_req;
+	int b_bus_req;
+
+	/* Output */
+	int drv_vbus;
+	int loc_conn;
+	int loc_sof;
+
+	struct otg_fsm_ops *ops;
+	struct otg_transceiver *transceiver;
+
+	/* Current usb protocol used: 0:undefine; 1:host; 2:client */
+	int protocol;
+	spinlock_t lock;
+};
+
+struct otg_fsm_ops {
+	void	(*chrg_vbus)(int on);
+	void	(*drv_vbus)(int on);
+	void	(*loc_conn)(int on);
+	void	(*loc_sof)(int on);
+	void	(*start_pulse)(void);
+	void	(*add_timer)(void *timer);
+	void	(*del_timer)(void *timer);
+	int	(*start_host)(struct otg_fsm *fsm, int on);
+	int	(*start_gadget)(struct otg_fsm *fsm, int on);
+};
+
+
+static inline void otg_chrg_vbus(struct otg_fsm *fsm, int on)
+{
+	fsm->ops->chrg_vbus(on);
+}
+
+static inline void otg_drv_vbus(struct otg_fsm *fsm, int on)
+{
+	if (fsm->drv_vbus != on) {
+		fsm->drv_vbus = on;
+		fsm->ops->drv_vbus(on);
+	}
+}
+
+static inline void otg_loc_conn(struct otg_fsm *fsm, int on)
+{
+	if (fsm->loc_conn != on) {
+		fsm->loc_conn = on;
+		fsm->ops->loc_conn(on);
+	}
+}
+
+static inline void otg_loc_sof(struct otg_fsm *fsm, int on)
+{
+	if (fsm->loc_sof != on) {
+		fsm->loc_sof = on;
+		fsm->ops->loc_sof(on);
+	}
+}
+
+static inline void otg_start_pulse(struct otg_fsm *fsm)
+{
+	fsm->ops->start_pulse();
+}
+
+static inline void otg_add_timer(struct otg_fsm *fsm, void *timer)
+{
+	fsm->ops->add_timer(timer);
+}
+
+static inline void otg_del_timer(struct otg_fsm *fsm, void *timer)
+{
+	fsm->ops->del_timer(timer);
+}
+
+int otg_statemachine(struct otg_fsm *fsm);
+
+/* Defined by device specific driver, for different timer implementation */
+extern struct fsl_otg_timer *a_wait_vrise_tmr, *a_wait_bcon_tmr,
+	*a_aidl_bdis_tmr, *b_ase0_brst_tmr, *b_se0_srp_tmr, *b_srp_fail_tmr,
+	*a_wait_enum_tmr;