Add the rt linux 4.1.3-rt3 as base

[kvmfornfv.git] / kernel / drivers / usb / chipidea / otg.c

diff --git a/kernel/drivers/usb/chipidea/otg.c b/kernel/drivers/usb/chipidea/otg.c
new file mode 100644 (file)
index 0000000..ad6c87a
--- /dev/null
+++ b/kernel/drivers/usb/chipidea/otg.c
@@ -0,0 +1,148 @@
+/*
+ * otg.c - ChipIdea USB IP core OTG driver
+ *
+ * Copyright (C) 2013 Freescale Semiconductor, Inc.
+ *
+ * Author: Peter Chen
+ *
+ * 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 otgsc register, OTG fsm operations for HNP and SRP
+ * are also included.
+ */
+
+#include <linux/usb/otg.h>
+#include <linux/usb/gadget.h>
+#include <linux/usb/chipidea.h>
+
+#include "ci.h"
+#include "bits.h"
+#include "otg.h"
+#include "otg_fsm.h"
+
+/**
+ * hw_read_otgsc returns otgsc register bits value.
+ * @mask: bitfield mask
+ */
+u32 hw_read_otgsc(struct ci_hdrc *ci, u32 mask)
+{
+       return hw_read(ci, OP_OTGSC, mask);
+}
+
+/**
+ * hw_write_otgsc updates target bits of OTGSC register.
+ * @mask: bitfield mask
+ * @data: to be written
+ */
+void hw_write_otgsc(struct ci_hdrc *ci, u32 mask, u32 data)
+{
+       hw_write(ci, OP_OTGSC, mask | OTGSC_INT_STATUS_BITS, data);
+}
+
+/**
+ * ci_otg_role - pick role based on ID pin state
+ * @ci: the controller
+ */
+enum ci_role ci_otg_role(struct ci_hdrc *ci)
+{
+       enum ci_role role = hw_read_otgsc(ci, OTGSC_ID)
+               ? CI_ROLE_GADGET
+               : CI_ROLE_HOST;
+
+       return role;
+}
+
+void ci_handle_vbus_change(struct ci_hdrc *ci)
+{
+       if (!ci->is_otg)
+               return;
+
+       if (hw_read_otgsc(ci, OTGSC_BSV))
+               usb_gadget_vbus_connect(&ci->gadget);
+       else
+               usb_gadget_vbus_disconnect(&ci->gadget);
+}
+
+#define CI_VBUS_STABLE_TIMEOUT_MS 5000
+static void ci_handle_id_switch(struct ci_hdrc *ci)
+{
+       enum ci_role role = ci_otg_role(ci);
+
+       if (role != ci->role) {
+               dev_dbg(ci->dev, "switching from %s to %s\n",
+                       ci_role(ci)->name, ci->roles[role]->name);
+
+               ci_role_stop(ci);
+               /* wait vbus lower than OTGSC_BSV */
+               hw_wait_reg(ci, OP_OTGSC, OTGSC_BSV, 0,
+                               CI_VBUS_STABLE_TIMEOUT_MS);
+               ci_role_start(ci, role);
+       }
+}
+/**
+ * ci_otg_work - perform otg (vbus/id) event handle
+ * @work: work struct
+ */
+static void ci_otg_work(struct work_struct *work)
+{
+       struct ci_hdrc *ci = container_of(work, struct ci_hdrc, work);
+
+       if (ci_otg_is_fsm_mode(ci) && !ci_otg_fsm_work(ci)) {
+               enable_irq(ci->irq);
+               return;
+       }
+
+       pm_runtime_get_sync(ci->dev);
+       if (ci->id_event) {
+               ci->id_event = false;
+               ci_handle_id_switch(ci);
+       } else if (ci->b_sess_valid_event) {
+               ci->b_sess_valid_event = false;
+               ci_handle_vbus_change(ci);
+       } else
+               dev_err(ci->dev, "unexpected event occurs at %s\n", __func__);
+       pm_runtime_put_sync(ci->dev);
+
+       enable_irq(ci->irq);
+}
+
+
+/**
+ * ci_hdrc_otg_init - initialize otg struct
+ * ci: the controller
+ */
+int ci_hdrc_otg_init(struct ci_hdrc *ci)
+{
+       INIT_WORK(&ci->work, ci_otg_work);
+       ci->wq = create_singlethread_workqueue("ci_otg");
+       if (!ci->wq) {
+               dev_err(ci->dev, "can't create workqueue\n");
+               return -ENODEV;
+       }
+
+       if (ci_otg_is_fsm_mode(ci))
+               return ci_hdrc_otg_fsm_init(ci);
+
+       return 0;
+}
+
+/**
+ * ci_hdrc_otg_destroy - destroy otg struct
+ * ci: the controller
+ */
+void ci_hdrc_otg_destroy(struct ci_hdrc *ci)
+{
+       if (ci->wq) {
+               flush_workqueue(ci->wq);
+               destroy_workqueue(ci->wq);
+       }
+       /* Disable all OTG irq and clear status */
+       hw_write_otgsc(ci, OTGSC_INT_EN_BITS | OTGSC_INT_STATUS_BITS,
+                                               OTGSC_INT_STATUS_BITS);
+       if (ci_otg_is_fsm_mode(ci))
+               ci_hdrc_otg_fsm_remove(ci);
+}