Merge Perforce changeset 219917 to head:

  Copy Altera JTAG UART nexus bus attachment as a starting point
  for an FDT bus attachment.

Sponsored by: DARPA, AFRL

1 files changed, 143 insertions, 0 deletions

diff --git a/sys/dev/altera/jtag_uart/altera_jtag_uart_fdt.c b/sys/dev/altera/jtag_uart/altera_jtag_uart_fdt.c
new file mode 100644
index 0000000..2592249
--- /dev/null
+++ b/sys/dev/altera/jtag_uart/altera_jtag_uart_fdt.c
@@ -0,0 +1,143 @@
+/*-
+ * Copyright (c) 2012 Robert N. M. Watson
+ * All rights reserved.
+ *
+ * This software was developed by SRI International and the University of
+ * Cambridge Computer Laboratory under DARPA/AFRL contract (FA8750-10-C-0237)
+ * ("CTSRD"), as part of the DARPA CRASH research programme.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
+ * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
+ * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+ * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+ * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+ * SUCH DAMAGE.
+ */
+
+#include <sys/cdefs.h>
+__FBSDID("$FreeBSD$");
+
+#include <sys/param.h>
+#include <sys/bus.h>
+#include <sys/condvar.h>
+#include <sys/conf.h>
+#include <sys/bio.h>
+#include <sys/kernel.h>
+#include <sys/lock.h>
+#include <sys/malloc.h>
+#include <sys/module.h>
+#include <sys/mutex.h>
+#include <sys/rman.h>
+#include <sys/systm.h>
+#include <sys/taskqueue.h>
+
+#include <machine/bus.h>
+#include <machine/resource.h>
+
+#include <geom/geom_disk.h>
+
+#include <dev/altera/jtag_uart/altera_jtag_uart.h>
+
+/*
+ * Nexus bus attachment for Altera JTAG UARTs.  Appropriate for most Altera
+ * FPGA SoC-style configurations in which the IP core will be exposed to the
+ * processor via a memory-mapped Avalon bus.
+ */
+static int
+altera_jtag_uart_nexus_probe(device_t dev)
+{
+
+	device_set_desc(dev, "Altera JTAG UART");
+	return (BUS_PROBE_DEFAULT);
+}
+
+static int
+altera_jtag_uart_nexus_attach(device_t dev)
+{
+	struct altera_jtag_uart_softc *sc;
+	int error;
+
+	error = 0;
+	sc = device_get_softc(dev);
+	sc->ajus_dev = dev;
+	sc->ajus_unit = device_get_unit(dev);
+	sc->ajus_mem_rid = 0;
+	sc->ajus_mem_res = bus_alloc_resource_any(dev, SYS_RES_MEMORY,
+	    &sc->ajus_mem_rid, RF_ACTIVE);
+	if (sc->ajus_mem_res == NULL) {
+		device_printf(dev, "couldn't map memory\n");
+		error = ENXIO;
+		goto out;
+	}
+
+	/*
+	 * Interrupt support is optional -- if we can't allocate an IRQ, then
+	 * we fall back on polling.
+	 */
+	sc->ajus_irq_rid = 0;
+	sc->ajus_irq_res = bus_alloc_resource_any(dev, SYS_RES_IRQ,
+	    &sc->ajus_irq_rid, RF_ACTIVE | RF_SHAREABLE);
+	if (sc->ajus_irq_res == NULL)
+		device_printf(dev,
+		    "IRQ unavailable; selecting polled operation\n");
+	error = altera_jtag_uart_attach(sc);
+out:
+	if (error) {
+		if (sc->ajus_irq_res != NULL)
+			bus_release_resource(dev, SYS_RES_IRQ,
+			    sc->ajus_irq_rid, sc->ajus_irq_res);
+		if (sc->ajus_mem_res != NULL)
+			bus_release_resource(dev, SYS_RES_MEMORY,
+			    sc->ajus_mem_rid, sc->ajus_mem_res);
+	}
+	return (error);
+}
+
+static int
+altera_jtag_uart_nexus_detach(device_t dev)
+{
+	struct altera_jtag_uart_softc *sc;
+
+	sc = device_get_softc(dev);
+	KASSERT(sc->ajus_mem_res != NULL, ("%s: resources not allocated",
+	    __func__));
+
+	altera_jtag_uart_detach(sc);
+	bus_release_resource(dev, SYS_RES_IRQ, sc->ajus_irq_rid,
+	    sc->ajus_irq_res);
+	bus_release_resource(dev, SYS_RES_MEMORY, sc->ajus_mem_rid,
+	    sc->ajus_mem_res);
+	return (0);
+}
+
+static device_method_t altera_jtag_uart_nexus_methods[] = {
+	DEVMETHOD(device_probe,		altera_jtag_uart_nexus_probe),
+	DEVMETHOD(device_attach,	altera_jtag_uart_nexus_attach),
+	DEVMETHOD(device_detach,	altera_jtag_uart_nexus_detach),
+	{ 0, 0 }
+};
+
+static driver_t altera_jtag_uart_nexus_driver = {
+	"altera_jtag_uart",
+	altera_jtag_uart_nexus_methods,
+	sizeof(struct altera_jtag_uart_softc),
+};
+
+static devclass_t altera_jtag_uart_devclass;
+
+DRIVER_MODULE(altera_jtag_uart, nexus, altera_jtag_uart_nexus_driver,
+    altera_jtag_uart_devclass, 0, 0);