Introduce support for cpufreq on PowerPC with the dynamic frequency

switching capabilities of the MPC7447A and MPC7448.

1 files changed, 206 insertions, 0 deletions

diff --git a/sys/powerpc/ofw/ofw_cpu.c b/sys/powerpc/ofw/ofw_cpu.c
new file mode 100644
index 0000000..846556e
--- /dev/null
+++ b/sys/powerpc/ofw/ofw_cpu.c
@@ -0,0 +1,206 @@
+/*-
+ * Copyright (C) 2009 Nathan Whitehorn
+ * 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 Benno Rice ``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 TOOLS GMBH 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.
+ *
+ * $FreeBSD$
+ */
+
+#include <sys/param.h>
+#include <sys/systm.h>
+#include <sys/kernel.h>
+#include <sys/module.h>
+#include <sys/malloc.h>
+#include <sys/bus.h>
+#include <sys/cpu.h>
+#include <machine/bus.h>
+
+#include <dev/ofw/openfirm.h>
+#include <dev/ofw/ofw_bus.h>
+#include <dev/ofw/ofw_bus_subr.h>
+
+static int	ofw_cpulist_probe(device_t);
+static int	ofw_cpulist_attach(device_t);
+static const struct ofw_bus_devinfo *ofw_cpulist_get_devinfo(device_t dev,
+    device_t child);
+
+static MALLOC_DEFINE(M_OFWCPU, "ofwcpu", "OFW CPU device information");
+
+static device_method_t ofw_cpulist_methods[] = {
+	/* Device interface */
+	DEVMETHOD(device_probe,		ofw_cpulist_probe),
+	DEVMETHOD(device_attach,	ofw_cpulist_attach),
+
+	/* Bus interface */
+	DEVMETHOD(bus_driver_added,	bus_generic_driver_added),
+	DEVMETHOD(bus_add_child,	bus_generic_add_child),
+	DEVMETHOD(bus_print_child,	bus_generic_print_child),
+	DEVMETHOD(bus_child_pnpinfo_str, ofw_bus_gen_child_pnpinfo_str),
+
+	/* ofw_bus interface */
+	DEVMETHOD(ofw_bus_get_devinfo,	ofw_cpulist_get_devinfo),
+	DEVMETHOD(ofw_bus_get_compat,	ofw_bus_gen_get_compat),
+	DEVMETHOD(ofw_bus_get_model,	ofw_bus_gen_get_model),
+	DEVMETHOD(ofw_bus_get_name,	ofw_bus_gen_get_name),
+	DEVMETHOD(ofw_bus_get_node,	ofw_bus_gen_get_node),
+	DEVMETHOD(ofw_bus_get_type,	ofw_bus_gen_get_type),
+
+	{ 0, 0 }
+};
+
+static driver_t ofw_cpulist_driver = {
+	"cpulist",
+	ofw_cpulist_methods,
+	0
+};
+
+static devclass_t ofw_cpulist_devclass;
+
+DRIVER_MODULE(ofw_cpulist, nexus, ofw_cpulist_driver, ofw_cpulist_devclass,
+    0, 0);
+
+static int 
+ofw_cpulist_probe(device_t dev) 
+{
+	const char	*name;
+
+	name = ofw_bus_get_name(dev);
+
+	if (name == NULL || strcmp(name, "cpus") != 0)
+		return (ENXIO);
+
+	device_set_desc(dev, "Open Firmware CPU Group");
+
+	return (0);
+}
+
+static int 
+ofw_cpulist_attach(device_t dev) 
+{
+	phandle_t root, child;
+	device_t cdev;
+	struct ofw_bus_devinfo *dinfo;
+
+	root = ofw_bus_get_node(dev);
+
+	for (child = OF_child(root); child != 0; child = OF_peer(child)) {
+		dinfo = malloc(sizeof(*dinfo), M_OFWCPU, M_WAITOK | M_ZERO);
+
+                if (ofw_bus_gen_setup_devinfo(dinfo, child) != 0) {
+                        free(dinfo, M_OFWCPU);
+                        continue;
+                }
+                cdev = device_add_child(dev, NULL, -1);
+                if (cdev == NULL) {
+                        device_printf(dev, "<%s>: device_add_child failed\n",
+                            dinfo->obd_name);
+                        ofw_bus_gen_destroy_devinfo(dinfo);
+                        free(dinfo, M_OFWCPU);
+                        continue;
+                }
+		device_set_ivars(cdev, dinfo);
+	}
+
+	return (bus_generic_attach(dev));
+}
+
+static const struct ofw_bus_devinfo *
+ofw_cpulist_get_devinfo(device_t dev, device_t child) 
+{
+	return (device_get_ivars(child));	
+}
+
+static int	ofw_cpu_probe(device_t);
+static int	ofw_cpu_attach(device_t);
+static int	ofw_cpu_read_ivar(device_t dev, device_t child, int index,
+    uintptr_t *result);
+
+static device_method_t ofw_cpu_methods[] = {
+	/* Device interface */
+	DEVMETHOD(device_probe,		ofw_cpu_probe),
+	DEVMETHOD(device_attach,	ofw_cpu_attach),
+
+	/* Bus interface */
+	DEVMETHOD(bus_driver_added,	bus_generic_driver_added),
+	DEVMETHOD(bus_add_child,	bus_generic_add_child),
+	DEVMETHOD(bus_print_child,	bus_generic_print_child),
+	DEVMETHOD(bus_read_ivar,	ofw_cpu_read_ivar),
+	DEVMETHOD(bus_setup_intr,	bus_generic_setup_intr),
+	DEVMETHOD(bus_teardown_intr,	bus_generic_teardown_intr),
+	DEVMETHOD(bus_alloc_resource,	bus_generic_alloc_resource),
+	DEVMETHOD(bus_release_resource,	bus_generic_release_resource),
+	DEVMETHOD(bus_activate_resource,bus_generic_activate_resource),
+
+	{ 0, 0 }
+};
+
+static driver_t ofw_cpu_driver = {
+	"cpu",
+	ofw_cpu_methods,
+	0
+};
+
+static devclass_t ofw_cpu_devclass;
+
+DRIVER_MODULE(ofw_cpu, cpulist, ofw_cpu_driver, ofw_cpu_devclass, 0, 0);
+
+static int
+ofw_cpu_probe(device_t dev)
+{
+	const char *type = ofw_bus_get_type(dev);
+
+	if (strcmp(type, "cpu") != 0)
+		return (ENXIO);
+
+	device_set_desc(dev, "Open Firmware CPU");
+	return (0);
+}
+
+static int
+ofw_cpu_attach(device_t dev)
+{
+	bus_generic_probe(dev);
+	return (bus_generic_attach(dev));
+}
+
+static int
+ofw_cpu_read_ivar(device_t dev, device_t child, int index, uintptr_t *result)
+{
+	uint32_t cell;
+
+	switch (index) {
+	case CPU_IVAR_PCPU:
+		OF_getprop(ofw_bus_get_node(dev), "reg", &cell, sizeof(cell));
+		*result = (uintptr_t)(pcpu_find(cell));
+		return (0);
+	case CPU_IVAR_NOMINAL_MHZ:
+		cell = 0;
+		OF_getprop(ofw_bus_get_node(dev), "clock-frequency",
+		    &cell, sizeof(cell));
+		cell /= 1000000; /* convert to MHz */
+		*result = (uintptr_t)(cell);
+		return (0);
+	}
+
+	return (ENOENT);
+}
+