Add quirk to disable 64-bit XHCI DMA after r276717.

Requested by:	Gary Jennejohn <gljennjohn@gmail.com>
MFC after:	3 days

4 files changed, 12 insertions, 7 deletions

diff --git a/sys/arm/samsung/exynos/exynos5_xhci.c b/sys/arm/samsung/exynos/exynos5_xhci.c
index 87ecd8a..2accd4c 100644
--- a/sys/arm/samsung/exynos/exynos5_xhci.c
+++ b/sys/arm/samsung/exynos/exynos5_xhci.c
@@ -239,7 +239,7 @@ exynos_xhci_attach(device_t dev)
 		return (ENXIO);
 	}
 
-	if (xhci_init(&esc->base, dev)) {
+	if (xhci_init(&esc->base, dev, 0)) {
 		device_printf(dev, "Could not initialize softc\n");
 		bus_release_resources(dev, exynos_xhci_spec, esc->res);
 		return (ENXIO);
diff --git a/sys/dev/usb/controller/xhci.c b/sys/dev/usb/controller/xhci.c
index b248399..412c27a 100644
--- a/sys/dev/usb/controller/xhci.c
+++ b/sys/dev/usb/controller/xhci.c
@@ -97,15 +97,19 @@ SYSCTL_INT(_hw_usb_xhci, OID_AUTO, streams, CTLFLAG_RWTUN,
 static int xhcidebug;
 static int xhciroute;
 static int xhcipolling;
+static int xhcidma32;
 
 SYSCTL_INT(_hw_usb_xhci, OID_AUTO, debug, CTLFLAG_RWTUN,
     &xhcidebug, 0, "Debug level");
 SYSCTL_INT(_hw_usb_xhci, OID_AUTO, xhci_port_route, CTLFLAG_RWTUN,
-    &xhciroute, 0, "Routing bitmap for switching EHCI ports to XHCI controller");
+    &xhciroute, 0, "Routing bitmap for switching EHCI ports to the XHCI controller");
 SYSCTL_INT(_hw_usb_xhci, OID_AUTO, use_polling, CTLFLAG_RWTUN,
-    &xhcipolling, 0, "Set to enable software interrupt polling for XHCI controller");
+    &xhcipolling, 0, "Set to enable software interrupt polling for the XHCI controller");
+SYSCTL_INT(_hw_usb_xhci, OID_AUTO, dma32, CTLFLAG_RWTUN,
+    &xhcidma32, 0, "Set to only use 32-bit DMA for the XHCI controller");
 #else
 #define	xhciroute 0
+#define	xhcidma32 0
 #endif
 
 #define	XHCI_INTR_ENDPT 1
@@ -576,7 +580,7 @@ xhci_halt_controller(struct xhci_softc *sc)
 }
 
 usb_error_t
-xhci_init(struct xhci_softc *sc, device_t self)
+xhci_init(struct xhci_softc *sc, device_t self, uint8_t dma32)
 {
 	uint32_t temp;
 
@@ -623,7 +627,8 @@ xhci_init(struct xhci_softc *sc, device_t self)
 	}
 
 	/* get DMA bits */
-	sc->sc_bus.dma_bits = XHCI_HCS0_AC64(temp) ? 64 : 32;
+	sc->sc_bus.dma_bits = (XHCI_HCS0_AC64(temp) &&
+	    xhcidma32 == 0 && dma32 == 0) ? 64 : 32;
 
 	device_printf(self, "%d bytes context size, %d-bit DMA\n",
 	    sc->sc_ctx_is_64_byte ? 64 : 32, (int)sc->sc_bus.dma_bits);
diff --git a/sys/dev/usb/controller/xhci.h b/sys/dev/usb/controller/xhci.h
index c7610bb..ac21c0f 100644
--- a/sys/dev/usb/controller/xhci.h
+++ b/sys/dev/usb/controller/xhci.h
@@ -522,7 +522,7 @@ struct xhci_softc {
 
 uint8_t 	xhci_use_polling(void);
 usb_error_t xhci_halt_controller(struct xhci_softc *);
-usb_error_t xhci_init(struct xhci_softc *, device_t);
+usb_error_t xhci_init(struct xhci_softc *, device_t, uint8_t);
 usb_error_t xhci_start_controller(struct xhci_softc *);
 void	xhci_interrupt(struct xhci_softc *);
 void	xhci_uninit(struct xhci_softc *);
diff --git a/sys/dev/usb/controller/xhci_pci.c b/sys/dev/usb/controller/xhci_pci.c
index b39782a..9821814 100644
--- a/sys/dev/usb/controller/xhci_pci.c
+++ b/sys/dev/usb/controller/xhci_pci.c
@@ -192,7 +192,7 @@ xhci_pci_attach(device_t self)
 	sc->sc_io_hdl = rman_get_bushandle(sc->sc_io_res);
 	sc->sc_io_size = rman_get_size(sc->sc_io_res);
 
-	if (xhci_init(sc, self)) {
+	if (xhci_init(sc, self, 0)) {
 		device_printf(self, "Could not initialize softc\n");
 		bus_release_resource(self, SYS_RES_MEMORY, PCI_XHCI_CBMEM,
 		    sc->sc_io_res);