From f5757453dcc044374b033bf8a6dbe36c879508c9 Mon Sep 17 00:00:00 2001
From: Hans Petter Selasky <hselasky@FreeBSD.org>
Date: Mon, 23 Feb 2015 17:01:38 +0000
Subject: [PATCH] Add support for the DWC OTG v2 chipset found in the STM32F4
 series of processors. Make sure we pullup the data lines in device mode when
 we power on the port.

MFC after:	1 week
---
 sys/dev/usb/controller/dwc_otg.c    | 51 ++++++++++++++++++++++-------
 sys/dev/usb/controller/dwc_otgreg.h |  8 +++++
 2 files changed, 48 insertions(+), 11 deletions(-)

diff --git a/sys/dev/usb/controller/dwc_otg.c b/sys/dev/usb/controller/dwc_otg.c
index b90fbf56022..05d2f7125eb 100644
--- a/sys/dev/usb/controller/dwc_otg.c
+++ b/sys/dev/usb/controller/dwc_otg.c
@@ -108,12 +108,19 @@
    GINTSTS_WKUPINT | GINTSTS_USBSUSP | GINTMSK_OTGINTMSK |	\
    GINTSTS_SESSREQINT)
 
-static int dwc_otg_use_hsic;
+#define	DWC_OTG_PHY_ULPI 0
+#define	DWC_OTG_PHY_HSIC 1
+#define	DWC_OTG_PHY_INTERNAL 2
+
+#ifndef DWC_OTG_PHY_DEFAULT
+#define	DWC_OTG_PHY_DEFAULT DWC_OTG_PHY_ULPI
+#endif
+
+static int dwc_otg_phy_type = DWC_OTG_PHY_DEFAULT;
 
 static SYSCTL_NODE(_hw_usb, OID_AUTO, dwc_otg, CTLFLAG_RW, 0, "USB DWC OTG");
-
-SYSCTL_INT(_hw_usb_dwc_otg, OID_AUTO, use_hsic, CTLFLAG_RDTUN,
-    &dwc_otg_use_hsic, 0, "DWC OTG uses HSIC interface");
+SYSCTL_INT(_hw_usb_dwc_otg, OID_AUTO, phy_type, CTLFLAG_RDTUN,
+    &dwc_otg_phy_type, 0, "DWC OTG PHY TYPE - 0/1/2 - ULPI/HSIC/INTERNAL");
 
 #ifdef USB_DEBUG
 static int dwc_otg_debug;
@@ -3766,8 +3773,9 @@ dwc_otg_init(struct dwc_otg_softc *sc)
 		break;
 	}
 
-	/* select HSIC or non-HSIC mode */
-	if (dwc_otg_use_hsic) {
+	/* select HSIC, ULPI or internal PHY mode */
+	switch (dwc_otg_phy_type) {
+	case DWC_OTG_PHY_HSIC:
 		DWC_OTG_WRITE_4(sc, DOTG_GUSBCFG,
 		    GUSBCFG_PHYIF |
 		    GUSBCFG_TRD_TIM_SET(5) | temp);
@@ -3779,7 +3787,8 @@ dwc_otg_init(struct dwc_otg_softc *sc)
 		    temp & ~GLPMCFG_HSIC_CONN);
 		DWC_OTG_WRITE_4(sc, DOTG_GLPMCFG,
 		    temp | GLPMCFG_HSIC_CONN);
-	} else {
+		break;
+	case DWC_OTG_PHY_ULPI:
 		DWC_OTG_WRITE_4(sc, DOTG_GUSBCFG,
 		    GUSBCFG_ULPI_UTMI_SEL |
 		    GUSBCFG_TRD_TIM_SET(5) | temp);
@@ -3788,6 +3797,25 @@ dwc_otg_init(struct dwc_otg_softc *sc)
 		temp = DWC_OTG_READ_4(sc, DOTG_GLPMCFG);
 		DWC_OTG_WRITE_4(sc, DOTG_GLPMCFG,
 		    temp & ~GLPMCFG_HSIC_CONN);
+		break;
+	case DWC_OTG_PHY_INTERNAL:
+		DWC_OTG_WRITE_4(sc, DOTG_GUSBCFG,
+		    GUSBCFG_PHYSEL |
+		    GUSBCFG_TRD_TIM_SET(5) | temp);
+		DWC_OTG_WRITE_4(sc, DOTG_GOTGCTL, 0);
+
+		temp = DWC_OTG_READ_4(sc, DOTG_GLPMCFG);
+		DWC_OTG_WRITE_4(sc, DOTG_GLPMCFG,
+		    temp & ~GLPMCFG_HSIC_CONN);
+
+		temp = DWC_OTG_READ_4(sc, DOTG_GGPIO);
+		temp &= ~(DOTG_GGPIO_NOVBUSSENS | DOTG_GGPIO_I2CPADEN);
+		temp |= (DOTG_GGPIO_VBUSASEN | DOTG_GGPIO_VBUSBSEN |
+		    DOTG_GGPIO_PWRDWN);
+		DWC_OTG_WRITE_4(sc, DOTG_GGPIO, temp);
+		break;
+	default:
+		break;
 	}
 
 	/* clear global nak */
@@ -3807,9 +3835,6 @@ dwc_otg_init(struct dwc_otg_softc *sc)
 	/* wait 10ms */
 	usb_pause_mtx(&sc->sc_bus.bus_mtx, hz / 100);
 
-	/* pull up D+ */
-	dwc_otg_pull_up(sc);
-
 	temp = DWC_OTG_READ_4(sc, DOTG_GHWCFG3);
 
 	sc->sc_fifo_size = 4 * GHWCFG3_DFIFODEPTH_GET(temp);
@@ -4548,11 +4573,15 @@ tr_handle_set_port_feature:
 		/* nops */
 		break;
 	case UHF_PORT_POWER:
+		sc->sc_flags.port_powered = 1;
 		if (sc->sc_mode == DWC_MODE_HOST || sc->sc_mode == DWC_MODE_OTG) {
 			sc->sc_hprt_val |= HPRT_PRTPWR;
 			DWC_OTG_WRITE_4(sc, DOTG_HPRT, sc->sc_hprt_val);
 		}
-		sc->sc_flags.port_powered = 1;
+		if (sc->sc_mode == DWC_MODE_DEVICE || sc->sc_mode == DWC_MODE_OTG) {
+			/* pull up D+, if any */
+			dwc_otg_pull_up(sc);
+		}
 		break;
 	default:
 		err = USB_ERR_IOERROR;
diff --git a/sys/dev/usb/controller/dwc_otgreg.h b/sys/dev/usb/controller/dwc_otgreg.h
index 344d36a2853..8ab35829dda 100644
--- a/sys/dev/usb/controller/dwc_otgreg.h
+++ b/sys/dev/usb/controller/dwc_otgreg.h
@@ -196,6 +196,14 @@
 #define	GUSBCFG_TOUTCAL_MASK		0x00000007
 #define	GUSBCFG_TOUTCAL_SHIFT		0
 
+/* STM32F4 */
+#define	DOTG_GGPIO_NOVBUSSENS		(1 << 21)
+#define	DOTG_GGPIO_SOFOUTEN		(1 << 20)
+#define	DOTG_GGPIO_VBUSBSEN		(1 << 19)
+#define	DOTG_GGPIO_VBUSASEN		(1 << 18)
+#define	DOTG_GGPIO_I2CPADEN		(1 << 17)
+#define	DOTG_GGPIO_PWRDWN		(1 << 16)
+
 #define	GRSTCTL_AHBIDLE			(1<<31)
 #define	GRSTCTL_DMAREQ			(1<<30)
 #define	GRSTCTL_TXFNUM_MASK		0x000007c0