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From: Roger Quadros <rogerq@ti.com>
To: <peter.chen@freescale.com>
Cc: <balbi@kernel.org>, <tony@atomide.com>,
	<gregkh@linuxfoundation.org>, <dan.j.williams@intel.com>,
	<mathias.nyman@linux.intel.com>, <Joao.Pinto@synopsys.com>,
	<sergei.shtylyov@cogentembedded.com>, <jun.li@freescale.com>,
	<grygorii.strashko@ti.com>, <yoshihiro.shimoda.uh@renesas.com>,
	<robh@kernel.org>, <nsekhar@ti.com>, <b-liu@ti.com>,
	<linux-usb@vger.kernel.org>, <linux-omap@vger.kernel.org>,
	<linux-kernel@vger.kernel.org>, <devicetree@vger.kernel.org>,
	Roger Quadros <rogerq@ti.com>
Subject: [PATCH v9 10/14] usb: otg: add hcd companion support
Date: Wed, 8 Jun 2016 12:03:42 +0300	[thread overview]
Message-ID: <1465376626-30122-11-git-send-email-rogerq@ti.com> (raw)
In-Reply-To: <1465376626-30122-1-git-send-email-rogerq@ti.com>

From: Yoshihiro Shimoda <yoshihiro.shimoda.uh@renesas.com>

Since some host controller (e.g. EHCI) needs a companion host controller
(e.g. OHCI), this patch adds such a configuration to use it in the OTG
core.

Signed-off-by: Yoshihiro Shimoda <yoshihiro.shimoda.uh@renesas.com>
Signed-off-by: Roger Quadros <rogerq@ti.com>
Acked-by: Peter Chen <peter.chen@nxp.com>
Acked-by: Rob Herring <robh@kernel.org>
---
 Documentation/devicetree/bindings/usb/generic.txt |  3 +++
 drivers/usb/common/usb-otg.c                      | 32 ++++++++++++++++-------
 include/linux/usb/otg.h                           |  7 ++++-
 3 files changed, 32 insertions(+), 10 deletions(-)

diff --git a/Documentation/devicetree/bindings/usb/generic.txt b/Documentation/devicetree/bindings/usb/generic.txt
index f6866c1..1db1c33 100644
--- a/Documentation/devicetree/bindings/usb/generic.txt
+++ b/Documentation/devicetree/bindings/usb/generic.txt
@@ -27,6 +27,9 @@ Optional properties:
  - otg-controller: phandle to otg controller. Host or gadget controllers can
 			contain this property to link it to a particular OTG
 			controller.
+ - hcd-needs-companion: must be present if otg controller is dealing with
+			EHCI host controller that needs a companion OHCI host
+			controller.
 
 This is an attribute to a USB controller such as:
 
diff --git a/drivers/usb/common/usb-otg.c b/drivers/usb/common/usb-otg.c
index b5bdf62..98fcfa2 100644
--- a/drivers/usb/common/usb-otg.c
+++ b/drivers/usb/common/usb-otg.c
@@ -19,6 +19,7 @@
 #include <linux/module.h>
 #include <linux/of.h>
 #include <linux/of_platform.h>
+#include <linux/usb/of.h>
 #include <linux/usb/otg.h>
 #include <linux/usb/gadget.h>
 #include <linux/workqueue.h>
@@ -348,6 +349,10 @@ struct usb_otg *usb_otg_register(struct device *dev,
 	else
 		INIT_WORK(&otg->work, usb_drd_work);
 
+	if (of_find_property(dev->of_node, "hcd-needs-companion", NULL) ||
+	    config->hcd_needs_companion)	/* needs companion ? */
+		otg->flags |= OTG_FLAG_HCD_NEEDS_COMPANION;
+
 	otg->wq = create_freezable_workqueue("usb_otg");
 	if (!otg->wq) {
 		dev_err(dev, "otg: %s: can't create workqueue\n",
@@ -562,15 +567,18 @@ int usb_otg_register_hcd(struct usb_hcd *hcd, unsigned int irqnum,
 	/* HCD will be started by OTG fsm when needed */
 	mutex_lock(&otg->fsm.lock);
 	if (otg->primary_hcd.hcd) {
-		/* probably a shared HCD ? */
-		if (usb_otg_hcd_is_primary_hcd(hcd)) {
+		/* probably a shared HCD or a companion OHCI HCD ? */
+		if (!(otg->flags & OTG_FLAG_HCD_NEEDS_COMPANION) &&
+		    usb_otg_hcd_is_primary_hcd(hcd)) {
 			dev_err(otg_dev, "otg: primary host already registered\n");
 			goto err;
 		}
 
-		if (hcd->shared_hcd == otg->primary_hcd.hcd) {
+		if (otg->flags & OTG_FLAG_HCD_NEEDS_COMPANION ||
+		    (hcd->shared_hcd == otg->primary_hcd.hcd)) {
 			if (otg->shared_hcd.hcd) {
-				dev_err(otg_dev, "otg: shared host already registered\n");
+				dev_err(otg_dev,
+					"otg: shared/companion host already registered\n");
 				goto err;
 			}
 
@@ -578,10 +586,12 @@ int usb_otg_register_hcd(struct usb_hcd *hcd, unsigned int irqnum,
 			otg->shared_hcd.irqnum = irqnum;
 			otg->shared_hcd.irqflags = irqflags;
 			otg->shared_hcd.ops = ops;
-			dev_info(otg_dev, "otg: shared host %s registered\n",
+			dev_info(otg_dev,
+				 "otg: shared/companion host %s registered\n",
 				 dev_name(hcd->self.controller));
 		} else {
-			dev_err(otg_dev, "otg: invalid shared host %s\n",
+			dev_err(otg_dev,
+				"otg: invalid shared/companion host %s\n",
 				dev_name(hcd->self.controller));
 			goto err;
 		}
@@ -604,14 +614,17 @@ int usb_otg_register_hcd(struct usb_hcd *hcd, unsigned int irqnum,
 	 * we're ready only if we have shared HCD
 	 * or we don't need shared HCD.
 	 */
-	if (otg->shared_hcd.hcd || !otg->primary_hcd.hcd->shared_hcd) {
+	if (otg->shared_hcd.hcd ||
+	    (!(otg->flags & OTG_FLAG_HCD_NEEDS_COMPANION) &&
+	     !otg->primary_hcd.hcd->shared_hcd)) {
 		otg->host = hcd_to_bus(hcd);
 		/* FIXME: set bus->otg_port if this is true OTG port with HNP */
 
 		/* start FSM */
 		usb_otg_start_fsm(otg);
 	} else {
-		dev_dbg(otg_dev, "otg: can't start till shared host registers\n");
+		dev_dbg(otg_dev,
+			"otg: can't start till shared/companion host registers\n");
 	}
 
 	mutex_unlock(&otg->fsm.lock);
@@ -659,7 +672,8 @@ int usb_otg_unregister_hcd(struct usb_hcd *hcd)
 			 dev_name(hcd_dev));
 	} else if (hcd == otg->shared_hcd.hcd) {
 		otg->shared_hcd.hcd = NULL;
-		dev_info(otg_dev, "otg: shared host %s unregistered\n",
+		dev_info(otg_dev,
+			 "otg: shared/companion host %s unregistered\n",
 			 dev_name(hcd_dev));
 	} else {
 		mutex_unlock(&otg->fsm.lock);
diff --git a/include/linux/usb/otg.h b/include/linux/usb/otg.h
index cc58a2d..4c585ec 100644
--- a/include/linux/usb/otg.h
+++ b/include/linux/usb/otg.h
@@ -72,7 +72,8 @@ struct usb_otg_caps {
  * @list: list of otg controllers
  * @work: otg state machine work
  * @wq: otg state machine work queue
- * @flags: to track if host/gadget is running
+ * @flags: to track if host/gadget is running, or to indicate if hcd needs
+ *	   companion
  */
 struct usb_otg {
 	u8			default_a;
@@ -100,6 +101,7 @@ struct usb_otg {
 	u32 flags;
 #define OTG_FLAG_GADGET_RUNNING (1 << 0)
 #define OTG_FLAG_HOST_RUNNING (1 << 1)
+#define OTG_FLAG_HCD_NEEDS_COMPANION (1 << 2)
 	/* use otg->fsm.lock for serializing access */
 
 /*------------- deprecated interface -----------------------------*/
@@ -126,11 +128,14 @@ struct usb_otg {
  * @caps: otg capabilities of the controller
  * @ops: otg fsm operations
  * @otg_work: optional custom otg state machine work function
+ * @hcd_needs_companion: Indicates if host controller needs a companion
+ *			 controller
  */
 struct usb_otg_config {
 	struct usb_otg_caps *otg_caps;
 	struct otg_fsm_ops *fsm_ops;
 	void (*otg_work)(struct work_struct *work);
+	bool hcd_needs_companion;
 };
 
 extern const char *usb_otg_state_string(enum usb_otg_state state);
-- 
2.7.4

  parent reply	other threads:[~2016-06-08  9:05 UTC|newest]

Thread overview: 52+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2016-06-08  9:03 [PATCH v9 00/14] USB OTG/dual-role framework Roger Quadros
2016-06-08  9:03 ` [PATCH v9 01/14] usb: hcd: Initialize hcd->flags to 0 Roger Quadros
2016-06-08  9:03 ` [PATCH v9 02/14] usb: otg-fsm: Prevent build warning "VDBG" redefined Roger Quadros
2016-06-08  9:03 ` [PATCH v9 03/14] usb: hcd.h: Add OTG to HCD interface Roger Quadros
2016-06-08 11:39   ` Sergei Shtylyov
2016-06-08 12:04     ` Roger Quadros
2016-06-08 12:10       ` Sergei Shtylyov
2016-06-09  7:31         ` Roger Quadros
2016-06-09 10:16           ` Sergei Shtylyov
2016-06-09 14:11             ` Alan Stern
2016-06-10  7:01               ` Roger Quadros
2016-06-09  7:51   ` [PATCH v10 " Roger Quadros
2016-06-08  9:03 ` [PATCH v9 04/14] usb: otg-fsm: use usb_otg wherever possible Roger Quadros
2016-06-08  9:03 ` [PATCH v9 05/14] usb: otg-fsm: move host controller operations into usb_otg->hcd_ops Roger Quadros
2016-06-08  9:03 ` [PATCH v9 06/14] usb: gadget.h: Add OTG to gadget interface Roger Quadros
2016-06-08  9:03 ` [PATCH v9 07/14] usb: otg: get rid of CONFIG_USB_OTG_FSM in favour of CONFIG_USB_OTG Roger Quadros
2016-06-08  9:03 ` [PATCH v9 08/14] usb: otg: add OTG/dual-role core Roger Quadros
2016-06-08  9:53   ` Peter Chen
2016-06-08 10:12     ` Roger Quadros
2016-06-08 12:42       ` Peter Chen
2016-06-09  7:24         ` Roger Quadros
2016-06-12  6:26           ` Peter Chen
2016-06-12 10:56             ` Peter Chen
2016-06-09  7:53   ` [PATCH v10 " Roger Quadros
2016-06-09 12:34     ` Sergei Shtylyov
2016-06-10  7:04       ` Roger Quadros
2016-06-10 10:19       ` Roger Quadros
2016-06-10 10:44         ` Sergei Shtylyov
2016-06-10 10:54           ` Roger Quadros
2016-06-10 11:02             ` Felipe Balbi
2016-06-08  9:03 ` [PATCH v9 09/14] usb: of: add an API to get OTG device from USB controller node Roger Quadros
2016-06-08  9:03 ` Roger Quadros [this message]
2016-06-08  9:03 ` [PATCH v9 11/14] usb: otg: use dev_dbg() instead of VDBG() Roger Quadros
2016-06-08 15:10   ` Joe Perches
2016-06-09  7:25     ` Roger Quadros
2016-06-09  7:55   ` [PATCH v10 " Roger Quadros
2016-06-09 15:43     ` Joe Perches
2016-06-10  7:05       ` Roger Quadros
2016-06-08  9:03 ` [PATCH v9 12/14] usb: hcd: Adapt to OTG core Roger Quadros
2016-06-08 11:42   ` Sergei Shtylyov
2016-06-08 12:06     ` Roger Quadros
2016-06-08 12:11       ` Sergei Shtylyov
2016-06-09  7:27         ` Roger Quadros
2016-06-08  9:03 ` [PATCH v9 13/14] usb: gadget: udc: adapt " Roger Quadros
2016-06-09 10:49   ` Yoshihiro Shimoda
2016-06-10  7:06     ` Roger Quadros
2016-06-08  9:03 ` [PATCH v9 14/14] usb: host: xhci-plat: Add otg device to platform data Roger Quadros
2016-06-09  5:27 ` [PATCH v9 00/14] USB OTG/dual-role framework Peter Chen
2016-06-09  7:30   ` Roger Quadros
2016-06-09 10:13     ` Yoshihiro Shimoda
  -- strict thread matches above, loose matches on Subject: below --
2016-05-13 10:03 [PATCH v8 " Roger Quadros
2016-05-13 10:03 ` [PATCH v8 10/14] usb: otg: add hcd companion support Roger Quadros
2016-05-20  9:32   ` [PATCH v9 " Roger Quadros
2016-05-23 21:07     ` Rob Herring

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