usb: chipidea: usb OTG fsm initialization.

This patch adds OTG fsm related initialization when do otg init,
add a seperate file for OTG fsm related utilities.

Signed-off-by: Peter Chen <peter.chen@freescale.com>
Signed-off-by: Li Jun <b47624@freescale.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

5 files changed, 114 insertions, 0 deletions

diff --git a/drivers/usb/chipidea/Makefile b/drivers/usb/chipidea/Makefile
index 480bd4d5710a..2f099c7df7b5 100644
--- a/drivers/usb/chipidea/Makefile
+++ b/drivers/usb/chipidea/Makefile
@@ -6,6 +6,7 @@ ci_hdrc-y				:= core.o otg.o
 ci_hdrc-$(CONFIG_USB_CHIPIDEA_UDC)      += udc.o
 ci_hdrc-$(CONFIG_USB_CHIPIDEA_HOST)     += host.o
 ci_hdrc-$(CONFIG_USB_CHIPIDEA_DEBUG)    += debug.o
+ci_hdrc-$(CONFIG_USB_OTG_FSM)           += otg_fsm.o
 
 # Glue/Bridge layers go here
 
diff --git a/drivers/usb/chipidea/ci.h b/drivers/usb/chipidea/ci.h
index 7ae8cb680321..bd3529f29e86 100644
--- a/drivers/usb/chipidea/ci.h
+++ b/drivers/usb/chipidea/ci.h
@@ -17,6 +17,7 @@
 #include <linux/irqreturn.h>
 #include <linux/usb.h>
 #include <linux/usb/gadget.h>
+#include <linux/usb/otg-fsm.h>
 
 /******************************************************************************
  * DEFINE
@@ -139,6 +140,7 @@ struct hw_bank {
  * @roles: array of supported roles for this controller
  * @role: current role
  * @is_otg: if the device is otg-capable
+ * @fsm: otg finite state machine
  * @work: work for role changing
  * @wq: workqueue thread
  * @qh_pool: allocation pool for queue heads
@@ -174,6 +176,7 @@ struct ci_hdrc {
         struct ci_role_driver           *roles[CI_ROLE_END];
         enum ci_role                    role;
         bool                            is_otg;
+        struct otg_fsm                  fsm;
         struct work_struct              work;
         struct workqueue_struct         *wq;
 
@@ -319,6 +322,20 @@ static inline u32 hw_test_and_write(struct ci_hdrc *ci, enum ci_hw_regs reg,
         return (val & mask) >> __ffs(mask);
 }
 
+/**
+ * ci_otg_is_fsm_mode: runtime check if otg controller
+ * is in otg fsm mode.
+ */
+static inline bool ci_otg_is_fsm_mode(struct ci_hdrc *ci)
+{
+#ifdef CONFIG_USB_OTG_FSM
+        return ci->is_otg && ci->roles[CI_ROLE_HOST] &&
+                                        ci->roles[CI_ROLE_GADGET];
+#else
+        return false;
+#endif
+}
+
 u32 hw_read_intr_enable(struct ci_hdrc *ci);
 
 u32 hw_read_intr_status(struct ci_hdrc *ci);
diff --git a/drivers/usb/chipidea/otg.c b/drivers/usb/chipidea/otg.c
index c6943401a0b3..d76db51ecda7 100644
--- a/drivers/usb/chipidea/otg.c
+++ b/drivers/usb/chipidea/otg.c
@@ -22,6 +22,7 @@
 #include "ci.h"
 #include "bits.h"
 #include "otg.h"
+#include "otg_fsm.h"
 
 /**
  * hw_read_otgsc returns otgsc register bits value.
@@ -116,6 +117,9 @@ int ci_hdrc_otg_init(struct ci_hdrc *ci)
                 return -ENODEV;
         }
 
+        if (ci_otg_is_fsm_mode(ci))
+                return ci_hdrc_otg_fsm_init(ci);
+
         return 0;
 }
 
diff --git a/drivers/usb/chipidea/otg_fsm.c b/drivers/usb/chipidea/otg_fsm.c
new file mode 100644
index 000000000000..d9dfaa3cf40c
--- /dev/null
+++ b/drivers/usb/chipidea/otg_fsm.c
@@ -0,0 +1,63 @@
+/*
+ * otg_fsm.c - ChipIdea USB IP core OTG FSM driver
+ *
+ * Copyright (C) 2014 Freescale Semiconductor, Inc.
+ *
+ * Author: Jun Li
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ */
+
+/*
+ * This file mainly handles OTG fsm, it includes OTG fsm operations
+ * for HNP and SRP.
+ */
+
+#include <linux/usb/otg.h>
+#include <linux/usb/gadget.h>
+#include <linux/usb/hcd.h>
+#include <linux/usb/chipidea.h>
+
+#include "ci.h"
+#include "bits.h"
+#include "otg.h"
+#include "otg_fsm.h"
+
+int ci_hdrc_otg_fsm_init(struct ci_hdrc *ci)
+{
+        struct usb_otg *otg;
+
+        otg = devm_kzalloc(ci->dev,
+                        sizeof(struct usb_otg), GFP_KERNEL);
+        if (!otg) {
+                dev_err(ci->dev,
+                "Failed to allocate usb_otg structure for ci hdrc otg!\n");
+                return -ENOMEM;
+        }
+
+        otg->phy = ci->transceiver;
+        otg->gadget = &ci->gadget;
+        ci->fsm.otg = otg;
+        ci->transceiver->otg = ci->fsm.otg;
+        ci->fsm.power_up = 1;
+        ci->fsm.id = hw_read_otgsc(ci, OTGSC_ID) ? 1 : 0;
+        ci->transceiver->state = OTG_STATE_UNDEFINED;
+
+        mutex_init(&ci->fsm.lock);
+
+        /* Enable A vbus valid irq */
+        hw_write_otgsc(ci, OTGSC_AVVIE, OTGSC_AVVIE);
+
+        if (ci->fsm.id) {
+                ci->fsm.b_ssend_srp =
+                        hw_read_otgsc(ci, OTGSC_BSV) ? 0 : 1;
+                ci->fsm.b_sess_vld =
+                        hw_read_otgsc(ci, OTGSC_BSV) ? 1 : 0;
+                /* Enable BSV irq */
+                hw_write_otgsc(ci, OTGSC_BSVIE, OTGSC_BSVIE);
+        }
+
+        return 0;
+}
diff --git a/drivers/usb/chipidea/otg_fsm.h b/drivers/usb/chipidea/otg_fsm.h
new file mode 100644
index 000000000000..bf20a851b601
--- /dev/null
+++ b/drivers/usb/chipidea/otg_fsm.h
@@ -0,0 +1,29 @@
+/*
+ * Copyright (C) 2014 Freescale Semiconductor, Inc.
+ *
+ * Author: Jun Li
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ */
+
+#ifndef __DRIVERS_USB_CHIPIDEA_OTG_FSM_H
+#define __DRIVERS_USB_CHIPIDEA_OTG_FSM_H
+
+#include <linux/usb/otg-fsm.h>
+
+#ifdef CONFIG_USB_OTG_FSM
+
+int ci_hdrc_otg_fsm_init(struct ci_hdrc *ci);
+
+#else
+
+static inline int ci_hdrc_otg_fsm_init(struct ci_hdrc *ci)
+{
+        return 0;
+}
+
+#endif
+
+#endif /* __DRIVERS_USB_CHIPIDEA_OTG_FSM_H */