Add scc(4), a driver for serial communications controllers. These

controllers typically have multiple channels and support a number
of serial communications protocols. The scc(4) driver is itself
an umbrella driver that delegates the control over each channel
and mode to a subordinate driver (like uart(4)).
The scc(4) driver supports the Siemens SAB 82532 and the Zilog
Z8530 and replaces puc(4) for these devices.

1 files changed, 115 insertions, 0 deletions

diff --git a/sys/dev/uart/uart_bus_scc.c b/sys/dev/uart/uart_bus_scc.c
new file mode 100644
index 0000000..9fdcb8b
--- /dev/null
+++ b/sys/dev/uart/uart_bus_scc.c
@@ -0,0 +1,115 @@
+/*-
+ * Copyright (c) 2004-2006 Marcel Moolenaar
+ * All rights reserved.
+ *
+ * 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 ``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 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/systm.h>
+#include <sys/bus.h>
+#include <sys/conf.h>
+#include <sys/kernel.h>
+#include <sys/module.h>
+
+#include <machine/bus.h>
+#include <sys/rman.h>
+#include <machine/resource.h>
+
+#include <dev/scc/scc_bus.h>
+
+#include <dev/uart/uart.h>
+#include <dev/uart/uart_bus.h>
+
+static int uart_scc_attach(device_t dev);
+static int uart_scc_probe(device_t dev);
+
+static device_method_t uart_scc_methods[] = {
+	/* Device interface */
+	DEVMETHOD(device_probe,		uart_scc_probe),
+	DEVMETHOD(device_attach,	uart_scc_attach),
+	DEVMETHOD(device_detach,	uart_bus_detach),
+	/* Serdev interface */
+	DEVMETHOD(serdev_ihand,		uart_bus_ihand),
+	DEVMETHOD(serdev_sysdev,	uart_bus_sysdev),
+	{ 0, 0 }
+};
+
+static driver_t uart_scc_driver = {
+	uart_driver_name,
+	uart_scc_methods,
+	sizeof(struct uart_softc),
+};
+
+static int
+uart_scc_attach(device_t dev)
+{
+	device_t parent;
+	struct uart_softc *sc;
+	uintptr_t mtx;
+
+	parent = device_get_parent(dev);
+	sc = device_get_softc(dev);
+
+	if (BUS_READ_IVAR(parent, dev, SCC_IVAR_HWMTX, &mtx))
+		return (ENXIO);
+	sc->sc_hwmtx = (struct mtx *)(void *)mtx;
+	return (uart_bus_attach(dev));
+}
+
+static int
+uart_scc_probe(device_t dev)
+{
+	device_t parent;
+	struct uart_softc *sc;
+	uintptr_t ch, cl, md, rs;
+
+	parent = device_get_parent(dev);
+	sc = device_get_softc(dev);
+
+	if (BUS_READ_IVAR(parent, dev, SCC_IVAR_MODE, &md) ||
+	    BUS_READ_IVAR(parent, dev, SCC_IVAR_CLASS, &cl))
+		return (ENXIO);
+	if (md != SCC_MODE_ASYNC)
+		return (ENXIO);
+	switch (cl) {
+	case SCC_CLASS_SAB82532:
+		sc->sc_class = &uart_sab82532_class;
+		break;
+	case SCC_CLASS_Z8530:
+		sc->sc_class = &uart_z8530_class;
+		break;
+	default:
+		return (ENXIO);
+	}
+	if (BUS_READ_IVAR(parent, dev, SCC_IVAR_CHANNEL, &ch) ||
+	    BUS_READ_IVAR(parent, dev, SCC_IVAR_CLOCK, &cl) ||
+	    BUS_READ_IVAR(parent, dev, SCC_IVAR_REGSHFT, &rs))
+		return (ENXIO);
+
+	return (uart_bus_probe(dev, rs, cl, 0, ch));
+}
+
+DRIVER_MODULE(uart, scc, uart_scc_driver, uart_devclass, 0, 0);