Add a MacIO bus attachment. The Z8530 as present in the Mac needs

a different register shift and is fed by a different clock than
we use for UltraSPARC hardware. To deal with this, the regshft and
rclk fields in the class structure are removed and bus frontends
now pass the right regshft and rclk to the probe function where
they're put in the BAS and passed in to subordinate drivers.

sys/dev/scc/scc_bfe.h

@@ -103,8 +103,6 @@ struct scc_class {
 	u_int		cl_class;	/* SCC bus class ID. */
 	u_int		cl_modes;	/* Supported modes (bitset). */
 	int		cl_range;
-	u_int		cl_rclk;
-	u_int		cl_regshft;
 };
 
 extern struct scc_class scc_sab82532_class;
@@ -139,7 +137,7 @@ extern char scc_driver_name[];
 
 int scc_bfe_attach(device_t dev);
 int scc_bfe_detach(device_t dev);
-int scc_bfe_probe(device_t dev);
+int scc_bfe_probe(device_t dev, u_int, u_int);
 
 struct resource *scc_bus_alloc_resource(device_t, device_t, int, int *,
     u_long, u_long, u_long, u_int);

sys/dev/scc/scc_bfe_ebus.c

@@ -42,6 +42,9 @@ __FBSDID("$FreeBSD$");
 
 #include <dev/scc/scc_bfe.h>
 
+#define	EBUS_REGSHFT	0
+#define	EBUS_RCLK	29491200
+
 static int
 scc_ebus_probe(device_t dev)
 {
@@ -56,7 +59,7 @@ scc_ebus_probe(device_t dev)
 	if (!strcmp(nm, "se") || !strcmp(cmpt, "sab82532")) {
 		device_set_desc(dev, "Siemens SAB 82532 dual channel SCC");
 		sc->sc_class = &scc_sab82532_class;
-		return (scc_bfe_probe(dev));
+		return (scc_bfe_probe(dev, EBUS_REGSHFT, EBUS_RCLK));
 	}
 	return (ENXIO);
 }

sys/dev/scc/scc_bfe_macio.c

@@ -0,0 +1,87 @@
+/*-
+ * Copyright (c) 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 <dev/ofw/ofw_bus.h>
+
+#include <machine/bus.h>
+#include <sys/rman.h>
+#include <machine/resource.h>
+
+#include <dev/scc/scc_bfe.h>
+
+#define	MACIO_REGSHFT	4
+#define	MACIO_RCLK	230400
+
+static int
+scc_macio_probe(device_t dev)
+{
+	struct scc_softc *sc;
+	const char *nm;
+
+	sc = device_get_softc(dev);
+	nm = ofw_bus_get_name(dev);
+	if (!strcmp(nm, "escc")) {
+		device_set_desc(dev, "Zilog Z8530 dual channel SCC");
+		sc->sc_class = &scc_z8530_class;
+		return (scc_bfe_probe(dev, MACIO_REGSHFT, MACIO_RCLK));
+	}
+	return (ENXIO);
+}
+
+static device_method_t scc_macio_methods[] = {
+	/* Device interface */
+	DEVMETHOD(device_probe,		scc_macio_probe),
+	DEVMETHOD(device_attach,	scc_bfe_attach),
+	DEVMETHOD(device_detach,	scc_bfe_detach),
+
+	DEVMETHOD(bus_alloc_resource,	scc_bus_alloc_resource),
+	DEVMETHOD(bus_release_resource,	scc_bus_release_resource),
+	DEVMETHOD(bus_get_resource,	scc_bus_get_resource),
+	DEVMETHOD(bus_read_ivar,	scc_bus_read_ivar),
+	DEVMETHOD(bus_setup_intr,	scc_bus_setup_intr),
+	DEVMETHOD(bus_teardown_intr,	scc_bus_teardown_intr),
+	DEVMETHOD(bus_print_child,	bus_generic_print_child),
+	DEVMETHOD(bus_driver_added,	bus_generic_driver_added),
+	{ 0, 0 }
+};
+
+static driver_t scc_macio_driver = {
+	scc_driver_name,
+	scc_macio_methods,
+	sizeof(struct scc_softc),
+};
+
+DRIVER_MODULE(scc, macio, scc_macio_driver, scc_devclass, 0, 0);

sys/dev/scc/scc_bfe_sbus.c

@@ -42,6 +42,9 @@ __FBSDID("$FreeBSD$");
 
 #include <dev/scc/scc_bfe.h>
 
+#define	SBUS_REGSHFT	1
+#define	SBUS_RCLK	307200
+
 static int
 scc_sbus_probe(device_t dev)
 {
@@ -53,7 +56,7 @@ scc_sbus_probe(device_t dev)
 	if (!strcmp(nm, "zs")) {
 		device_set_desc(dev, "Zilog Z8530 dual channel SCC");
 		sc->sc_class = &scc_z8530_class;
-		return (scc_bfe_probe(dev));
+		return (scc_bfe_probe(dev, SBUS_REGSHFT, SBUS_RCLK));
 	}
 	return (ENXIO);
 }

sys/dev/scc/scc_core.c

@@ -313,7 +313,7 @@ scc_bfe_detach(device_t dev)
 }
 
 int
-scc_bfe_probe(device_t dev)
+scc_bfe_probe(device_t dev, u_int regshft, u_int rclk)
 {
 	struct scc_softc *sc;
 	struct scc_class *cl;
@@ -362,8 +362,8 @@ scc_bfe_probe(device_t dev)
 	sc->sc_bas.bsh = rman_get_bushandle(sc->sc_rres);
 	sc->sc_bas.bst = rman_get_bustag(sc->sc_rres);
 	sc->sc_bas.range = size;
-	sc->sc_bas.rclk = sc->sc_class->cl_rclk;
+	sc->sc_bas.rclk = rclk;
-	sc->sc_bas.regshft = sc->sc_class->cl_regshft;
+	sc->sc_bas.regshft = regshft;
 
 	error = SCC_PROBE(sc);
 	bus_release_resource(dev, sc->sc_rtype, sc->sc_rrid, sc->sc_rres);
@@ -442,13 +442,13 @@ scc_bus_read_ivar(device_t dev, device_t child, int index, uintptr_t *result)
 		*result = cl->cl_class;
 		break;
 	case SCC_IVAR_CLOCK:
-		*result = cl->cl_rclk;
+		*result = sc->sc_bas.rclk;
 		break;
 	case SCC_IVAR_MODE:
 		*result = m->m_mode;
 		break;
 	case SCC_IVAR_REGSHFT:
-		*result = cl->cl_regshft;
+		*result = sc->sc_bas.regshft;
 		break;
 	case SCC_IVAR_HWMTX:
 		*result = (uintptr_t)&sc->sc_hwmtx;

sys/dev/scc/scc_dev_sab82532.c

@@ -42,8 +42,6 @@ __FBSDID("$FreeBSD$");
 
 #include "scc_if.h"
 
-#define	DEFAULT_RCLK	29491200
-
 static int sab82532_bfe_attach(struct scc_softc *, int);
 static int sab82532_bfe_iclear(struct scc_softc *, struct scc_chan *);
 static int sab82532_bfe_ipend(struct scc_softc *);
@@ -65,8 +63,6 @@ struct scc_class scc_sab82532_class = {
 	.cl_class = SCC_CLASS_SAB82532,
 	.cl_modes = SCC_MODE_ASYNC | SCC_MODE_BISYNC | SCC_MODE_HDLC,
 	.cl_range = SAB_CHANLEN,
-	.cl_rclk = DEFAULT_RCLK,
-	.cl_regshft = 0
 };
 
 static int

sys/dev/scc/scc_dev_z8530.c

@@ -42,8 +42,6 @@ __FBSDID("$FreeBSD$");
 
 #include "scc_if.h"
 
-#define	DEFAULT_RCLK	307200
-
 static int z8530_bfe_attach(struct scc_softc *, int);
 static int z8530_bfe_iclear(struct scc_softc *, struct scc_chan *);
 static int z8530_bfe_ipend(struct scc_softc *);
@@ -65,8 +63,6 @@ struct scc_class scc_z8530_class = {
 	.cl_class = SCC_CLASS_Z8530,
 	.cl_modes = SCC_MODE_ASYNC | SCC_MODE_BISYNC | SCC_MODE_HDLC,
 	.cl_range = (CHAN_B - CHAN_A) << 1,
-	.cl_rclk = DEFAULT_RCLK,
-	.cl_regshft = 1,
 };
 
 /* Multiplexed I/O. */