arm: support for the raspberry Pi 2

 * Interrupt controller
 * Mailbox read/write
 * GPIO
 * SDHC
 * Watchdog
 * Simple bootloader code
 * USB (work in progress)

Some stuff taken from NetBSD.

sys/arch/armv7/Makefile

@@ -11,7 +11,7 @@ TAGS=	${.CURDIR}/tags
 NOPROG=
 NOMAN=
 NOOBJ=
-SUBDIR=
+SUBDIR=	stand
 
 # config the fattest kernel we can find into a temporary dir
 # to create a Makefile.  Then use make to pull some variables

sys/arch/armv7/broadcom/bcm2835_dwctwo.c

@@ -0,0 +1,151 @@
+/*	$OpenBSD: octdwctwo.c,v 1.4 2015/02/14 06:46:03 uebayasi Exp $	*/
+
+/*
+ * Copyright (c) 2015 Masao Uebayashi <uebayasi@tombiinc.com>
+ *
+ * Permission to use, copy, modify, and/or distribute this software for any
+ * purpose with or without fee is hereby granted, provided that the above
+ * copyright notice and this permission notice appear in all copies.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
+ * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
+ * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
+ * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
+ * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
+ * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
+ * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
+ */
+
+#include <sys/param.h>
+#include <sys/systm.h>
+#include <sys/device.h>
+#include <sys/malloc.h>
+#include <sys/pool.h>
+#include <sys/kthread.h>
+
+#include <machine/intr.h>
+#include <machine/bus.h>
+#include <machine/fdt.h>
+#include <armv7/armv7/armv7var.h>
+
+#include <dev/usb/usb.h>
+#include <dev/usb/usbdi.h>
+#include <dev/usb/usbdivar.h>
+#include <dev/usb/usb_mem.h>
+#include <dev/usb/usb_quirks.h>
+
+#include <dev/usb/dwc2/dwc2var.h>
+#include <dev/usb/dwc2/dwc2.h>
+#include <dev/usb/dwc2/dwc2_core.h>
+
+struct bcm_dwctwo_softc {
+	struct dwc2_softc	sc_dwc2;
+	struct arm32_bus_dma_tag sc_dmat;
+	struct arm32_dma_range	sc_dmarange[1];
+
+	void			*sc_ih;
+};
+
+int			bcm_dwctwo_match(struct device *, void *, void *);
+void			bcm_dwctwo_attach(struct device *, struct device *,
+			    void *);
+void			bcm_dwctwo_deferred(void *);
+
+const struct cfattach bcmdwctwo_ca = {
+	sizeof(struct bcm_dwctwo_softc), bcm_dwctwo_match, bcm_dwctwo_attach,
+};
+
+struct cfdriver dwctwo_cd = {
+	NULL, "dwctwo", DV_DULL
+};
+
+static struct dwc2_core_params bcm_dwctwo_params = {
+	.otg_cap			= 0,	/* HNP/SRP capable */
+	.otg_ver			= 0,	/* 1.3 */
+	.dma_enable			= 1,
+	.dma_desc_enable		= 0,
+	.speed				= 0,	/* High Speed */
+	.enable_dynamic_fifo		= 1,
+	.en_multiple_tx_fifo		= 1,
+	.host_rx_fifo_size		= 774,	/* 774 DWORDs */
+	.host_nperio_tx_fifo_size	= 256,	/* 256 DWORDs */
+	.host_perio_tx_fifo_size	= 512,	/* 512 DWORDs */
+	.max_transfer_size		= 65535,
+	.max_packet_count		= 511,
+	.host_channels			= 8,
+	.phy_type			= 1,	/* UTMI */
+	.phy_utmi_width			= 8,	/* 8 bits */
+	.phy_ulpi_ddr			= 0,	/* Single */
+	.phy_ulpi_ext_vbus		= 0,
+	.i2c_enable			= 0,
+	.ulpi_fs_ls			= 0,
+	.host_support_fs_ls_low_power	= 0,
+	.host_ls_low_power_phy_clk	= 0,	/* 48 MHz */
+	.ts_dline			= 0,
+	.reload_ctl			= 0,
+	.ahbcfg				= 0x10,
+	.uframe_sched			= 1,
+};
+
+int
+bcm_dwctwo_match(struct device *parent, void *match, void *aux)
+{
+	struct armv7_attach_args *aa = aux;
+
+	if (fdt_node_compatible("brcm,bcm2835-usb", aa->aa_node) ||
+	    fdt_node_compatible("broadcom,bcm2835-usb", aa->aa_node))
+		return (1);
+
+	return 0;
+}
+
+void
+bcm_dwctwo_attach(struct device *parent, struct device *self, void *aux)
+{
+	struct bcm_dwctwo_softc *sc = (struct bcm_dwctwo_softc *)self;
+	struct armv7_attach_args *aa = aux;
+	struct fdt_memory mem;
+	extern int physmem;
+	int rc;
+
+	printf("\n");
+
+	memcpy(&sc->sc_dmat, aa->aa_dmat, sizeof(sc->sc_dmat));
+	sc->sc_dmarange[0].dr_sysbase = 0;
+	sc->sc_dmarange[0].dr_busbase = 0xC0000000;
+	sc->sc_dmarange[0].dr_len = physmem * PAGE_SIZE;
+	sc->sc_dmat._ranges = sc->sc_dmarange;
+	sc->sc_dmat._nranges = 1;
+
+	sc->sc_dwc2.sc_iot = aa->aa_iot;
+	sc->sc_dwc2.sc_bus.pipe_size = sizeof(struct usbd_pipe);
+	sc->sc_dwc2.sc_bus.dmatag = &sc->sc_dmat;
+	sc->sc_dwc2.sc_params = &bcm_dwctwo_params;
+
+	rc = fdt_get_memory_address(aa->aa_node, 0, &mem);
+	KASSERT(rc == 0);
+
+	rc = bus_space_map(aa->aa_iot, mem.addr, mem.size,
+	    0, &sc->sc_dwc2.sc_ioh);
+	KASSERT(rc == 0);
+
+	sc->sc_ih = arm_intr_establish_fdt(aa->aa_node, IPL_SCHED, dwc2_intr,
+	    (void *)&sc->sc_dwc2, sc->sc_dwc2.sc_bus.bdev.dv_xname);
+	KASSERT(sc->sc_ih != NULL);
+
+	kthread_create_deferred(bcm_dwctwo_deferred, sc);
+}
+
+void
+bcm_dwctwo_deferred(void *self)
+{
+	struct bcm_dwctwo_softc *sc = (struct bcm_dwctwo_softc *)self;
+	int rc;
+
+	rc = dwc2_init(&sc->sc_dwc2);
+	if (rc != 0)
+		return;
+
+	sc->sc_dwc2.sc_child = config_found(&sc->sc_dwc2.sc_bus.bdev,
+	    &sc->sc_dwc2.sc_bus, usbctlprint);
+}