Introduce PowerPC-specific helper routines for FDT.

Reviewed by:	imp
Sponsored by:	The FreeBSD Foundation

1 files changed, 168 insertions, 0 deletions

diff --git a/sys/dev/fdt/fdt_powerpc.c b/sys/dev/fdt/fdt_powerpc.c
new file mode 100644
index 0000000..ea614db
--- /dev/null
+++ b/sys/dev/fdt/fdt_powerpc.c
@@ -0,0 +1,168 @@
+/*-
+ * Copyright (c) 2009-2010 The FreeBSD Foundation
+ * All rights reserved.
+ *
+ * This software was developed by Semihalf under sponsorship from
+ * the FreeBSD Foundation.
+ *
+ * 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/systm.h>
+#include <sys/kernel.h>
+#include <sys/module.h>
+#include <sys/bus.h>
+
+#include <machine/intr_machdep.h>
+
+#include <dev/ofw/ofw_bus.h>
+#include <dev/ofw/ofw_bus_subr.h>
+#include <dev/ofw/openfirm.h>
+
+#include "ofw_bus_if.h"
+#include "fdt_common.h"
+
+static void
+fdt_fixup_busfreq(phandle_t root)
+{
+	phandle_t sb, cpus, child;
+	pcell_t freq;
+
+	/*
+	 * Do a strict check so as to skip non-SOC nodes, which also claim
+	 * simple-bus compatibility such as eLBC etc.
+	 */
+	if ((sb = fdt_find_compatible(root, "simple-bus", 1)) == 0)
+		return;
+
+	/*
+	 * This fixup uses /cpus/ bus-frequency prop value to set simple-bus
+	 * bus-frequency property.
+	 */
+	if ((cpus = OF_finddevice("/cpus")) == 0)
+		return;
+
+	if ((child = OF_child(cpus)) == 0)
+		return;
+
+	if (OF_getprop(child, "bus-frequency", (void *)&freq,
+	    sizeof(freq)) <= 0)
+		return;
+
+	OF_setprop(sb, "bus-frequency", (void *)&freq, sizeof(freq));
+}
+
+struct fdt_fixup_entry fdt_fixup_table[] = {
+	{ "fsl,MPC8572DS", &fdt_fixup_busfreq },
+	{ "MPC8555CDS", &fdt_fixup_busfreq },
+	{ NULL, NULL }
+};
+
+static int
+fdt_pic_decode_iic(phandle_t node, pcell_t *intr, int *interrupt, int *trig,
+    int *pol)
+{
+	if (!fdt_is_compatible(node, "chrp,iic"))
+		return (ENXIO);
+
+	*interrupt = intr[0];
+
+	switch (intr[1]) {
+	case 0:
+		/* Active L level */
+		*trig = INTR_TRIGGER_LEVEL;
+		*pol = INTR_POLARITY_LOW;
+		break;
+	case 1:
+		/* Active H level */
+		*trig = INTR_TRIGGER_LEVEL;
+		*pol = INTR_POLARITY_HIGH;
+		break;
+	case 2:
+		/* H to L edge */
+		*trig = INTR_TRIGGER_EDGE;
+		*pol = INTR_POLARITY_LOW;
+		break;
+	case 3:
+		/* L to H edge */
+		*trig = INTR_TRIGGER_EDGE;
+		*pol = INTR_POLARITY_HIGH;
+		break;
+	default:
+		*trig = INTR_TRIGGER_CONFORM;
+		*pol = INTR_POLARITY_CONFORM;
+	}
+	return (0);
+}
+
+static int
+fdt_pic_decode_openpic(phandle_t node, pcell_t *intr, int *interrupt,
+    int *trig, int *pol)
+{
+
+	if (!fdt_is_compatible(node, "chrp,open-pic"))
+		return (ENXIO);
+
+	/*
+	 * XXX The interrupt number read out from the MPC85XX device tree is
+	 * already offset by 16 to reflect the 'internal' IRQ range shift on
+	 * the OpenPIC.
+	 */
+	*interrupt = intr[0];
+
+	switch (intr[1]) {
+	case 0:
+		/* L to H edge */
+		*trig = INTR_TRIGGER_EDGE;
+		*pol = INTR_POLARITY_HIGH;
+		break;
+	case 1:
+		/* Active L level */
+		*trig = INTR_TRIGGER_LEVEL;
+		*pol = INTR_POLARITY_LOW;
+		break;
+	case 2:
+		/* Active H level */
+		*trig = INTR_TRIGGER_LEVEL;
+		*pol = INTR_POLARITY_HIGH;
+		break;
+	case 3:
+		/* H to L edge */
+		*trig = INTR_TRIGGER_EDGE;
+		*pol = INTR_POLARITY_LOW;
+		break;
+	default:
+		*trig = INTR_TRIGGER_CONFORM;
+		*pol = INTR_POLARITY_CONFORM;
+	}
+	return (0);
+}
+
+fdt_pic_decode_t fdt_pic_table[] = {
+	&fdt_pic_decode_iic,
+	&fdt_pic_decode_openpic,
+	NULL
+};