linux-kernel - [PATCH 4/4] usb: dwc2: add dr

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Date:	Tue, 29 Jul 2014 18:35:29 -0700
From:	Kever Yang <kever.yang@...k-chips.com>
To:	heiko@...ech.de, robh+dt@...nel.org, pawel.moll@....com,
	mark.rutland@....com, ijc+devicetree@...lion.org.uk,
	galak@...eaurora.org, rdunlap@...radead.org,
	linux@....linux.org.uk, paulz@...opsys.com,
	gregkh@...uxfoundation.org, mporter@...aro.org, kishon@...com,
	balbi@...com
Cc:	swarren@...dotorg.org, devicetree@...r.kernel.org,
	linux-doc@...r.kernel.org, linux-kernel@...r.kernel.org,
	linux-arm-kernel@...ts.infradead.org, linux-usb@...r.kernel.org,
	kever.yang@...k-chips.com, addy.ke@...k-chips.com,
	xjq@...k-chips.com, cf@...k-chips.com, lyz@...k-chips.com,
	wulf@...k-chips.com, dianders@...omium.org, olof@...om.net,
	sonnyrao@...omium.org
Subject: [PATCH 4/4] usb: dwc2: add dr_mode support for dwc2

Some devices with A female host port and without use of usb_id pin
will need this for the otg controller works as device role
during firmware period and works as host role in rich os.

Signed-off-by: Kever Yang <kever.yang@...k-chips.com>
---
 drivers/usb/dwc2/core.c     |   13 +++++++++++++
 drivers/usb/dwc2/core.h     |    2 ++
 drivers/usb/dwc2/platform.c |    4 ++++
 3 files changed, 19 insertions(+)

diff --git a/drivers/usb/dwc2/core.c b/drivers/usb/dwc2/core.c
index 27d2c9b..6688951 100644
--- a/drivers/usb/dwc2/core.c
+++ b/drivers/usb/dwc2/core.c
@@ -118,6 +118,7 @@ static int dwc2_core_reset(struct dwc2_hsotg *hsotg)
 {
 	u32 greset;
 	int count = 0;
+	u32 gusbcfg;
 
 	dev_vdbg(hsotg->dev, "%s()\n", __func__);
 
@@ -148,6 +149,18 @@ static int dwc2_core_reset(struct dwc2_hsotg *hsotg)
 		}
 	} while (greset & GRSTCTL_CSFTRST);
 
+	if (hsotg->dr_mode == USB_DR_MODE_HOST) {
+		gusbcfg = readl(hsotg->regs+GUSBCFG);
+		gusbcfg &= ~GUSBCFG_FORCEDEVMODE;
+		gusbcfg |= GUSBCFG_FORCEHOSTMODE;
+		writel(gusbcfg, hsotg->regs+GUSBCFG);
+	} else if (hsotg->dr_mode == USB_DR_MODE_PERIPHERAL) {
+		gusbcfg = readl(hsotg->regs+GUSBCFG);
+		gusbcfg &= ~GUSBCFG_FORCEHOSTMODE;
+		gusbcfg |= GUSBCFG_FORCEDEVMODE;
+		writel(gusbcfg, hsotg->regs+GUSBCFG);
+	}
+
 	/*
 	 * NOTE: This long sleep is _very_ important, otherwise the core will
 	 * not stay in host mode after a connector ID change!
diff --git a/drivers/usb/dwc2/core.h b/drivers/usb/dwc2/core.h
index 1efd10c..9fe960b 100644
--- a/drivers/usb/dwc2/core.h
+++ b/drivers/usb/dwc2/core.h
@@ -501,6 +501,7 @@ struct dwc2_hw_params {
  *                      a_peripheral and b_device=>b_host) this may not match
  *                      the core, but allows the software to determine
  *                      transitions
+ * @dr_mode:            requested mode of operation
  * @queuing_high_bandwidth: True if multiple packets of a high-bandwidth
  *                      transfer are in process of being queued
  * @srp_success:        Stores status of SRP request in the case of a FS PHY
@@ -592,6 +593,7 @@ struct dwc2_hsotg {
 	/** Params to actually use */
 	struct dwc2_core_params *core_params;
 	enum usb_otg_state op_state;
+	enum usb_dr_mode        dr_mode;
 
 	unsigned int queuing_high_bandwidth:1;
 	unsigned int srp_success:1;
diff --git a/drivers/usb/dwc2/platform.c b/drivers/usb/dwc2/platform.c
index cc5983c..a2ac1ea 100644
--- a/drivers/usb/dwc2/platform.c
+++ b/drivers/usb/dwc2/platform.c
@@ -42,6 +42,8 @@
 #include <linux/of_device.h>
 #include <linux/platform_device.h>
 
+#include <linux/usb/of.h>
+
 #include "core.h"
 #include "hcd.h"
 
@@ -200,6 +202,8 @@ static int dwc2_driver_probe(struct platform_device *dev)
 	dev_dbg(&dev->dev, "mapped PA %08lx to VA %p\n",
 		(unsigned long)res->start, hsotg->regs);
 
+	hsotg->dr_mode = of_usb_get_dr_mode(dev->dev.of_node);
+
 	retval = dwc2_hcd_init(hsotg, irq, params);
 	if (retval)
 		return retval;
-- 
1.7.9.5


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