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authornwhitehorn <nwhitehorn@FreeBSD.org>2009-01-15 02:46:43 +0000
committernwhitehorn <nwhitehorn@FreeBSD.org>2009-01-15 02:46:43 +0000
commit39735dbe0affaccb4f474b3b6241dda1cd8558a6 (patch)
treea8059d41212a0ef7fc78e78f81939e5dab8cadf0
parentcc4917abc99a62355fedeb38f7f9f55f51385227 (diff)
downloadFreeBSD-src-39735dbe0affaccb4f474b3b6241dda1cd8558a6.zip
FreeBSD-src-39735dbe0affaccb4f474b3b6241dda1cd8558a6.tar.gz
Import an Open Firmware I2C bus module. This attaches firmware device tree
indicated I2C devices, and provides an ofw_bus interface for driver probing. This should be MI, but is currently provided only on PowerPC due to lack of sparc64 hardware with an I2C controller. Discussed on: freebsd-arch
-rw-r--r--sys/conf/files.powerpc1
-rw-r--r--sys/dev/iicbus/iicbus.c2
-rw-r--r--sys/dev/ofw/ofw_iicbus.c183
3 files changed, 186 insertions, 0 deletions
diff --git a/sys/conf/files.powerpc b/sys/conf/files.powerpc
index f5dc38b..b21d3c5 100644
--- a/sys/conf/files.powerpc
+++ b/sys/conf/files.powerpc
@@ -34,6 +34,7 @@ dev/ofw/ofw_if.m optional aim
dev/ofw/ofw_bus_subr.c optional aim
dev/ofw/ofw_console.c optional aim
dev/ofw/ofw_disk.c optional ofwd aim
+dev/ofw/ofw_iicbus.c optional iicbus aim
dev/ofw/ofw_standard.c optional aim
dev/powermac_nvram/powermac_nvram.c optional powermac_nvram powermac
dev/quicc/quicc_bfe_ocp.c optional quicc mpc85xx
diff --git a/sys/dev/iicbus/iicbus.c b/sys/dev/iicbus/iicbus.c
index e926984..dccb8be 100644
--- a/sys/dev/iicbus/iicbus.c
+++ b/sys/dev/iicbus/iicbus.c
@@ -268,3 +268,5 @@ driver_t iicbus_driver = {
devclass_t iicbus_devclass;
MODULE_VERSION(iicbus, IICBUS_MODVER);
+DRIVER_MODULE(iicbus, iichb, iicbus_driver, iicbus_devclass, 0, 0);
+
diff --git a/sys/dev/ofw/ofw_iicbus.c b/sys/dev/ofw/ofw_iicbus.c
new file mode 100644
index 0000000..1b0a274
--- /dev/null
+++ b/sys/dev/ofw/ofw_iicbus.c
@@ -0,0 +1,183 @@
+/*-
+ * Copyright (c) 2009, Nathan Whitehorn <nwhitehorn@FreeBSD.org>
+ * 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 unmodified, 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/bus.h>
+#include <sys/kernel.h>
+#include <sys/libkern.h>
+#include <sys/lock.h>
+#include <sys/module.h>
+#include <sys/mutex.h>
+
+#include <dev/iicbus/iicbus.h>
+#include <dev/iicbus/iiconf.h>
+#include <dev/ofw/ofw_bus.h>
+#include <dev/ofw/ofw_bus_subr.h>
+#include <dev/ofw/openfirm.h>
+
+#include "iicbus_if.h"
+
+/* Methods */
+static device_probe_t ofw_iicbus_probe;
+static device_attach_t ofw_iicbus_attach;
+static device_t ofw_iicbus_add_child(device_t dev, int order, const char *name,
+ int unit);
+static const struct ofw_bus_devinfo *ofw_iicbus_get_devinfo(device_t bus,
+ device_t dev);
+
+static device_method_t ofw_iicbus_methods[] = {
+ /* Device interface */
+ DEVMETHOD(device_probe, ofw_iicbus_probe),
+ DEVMETHOD(device_attach, ofw_iicbus_attach),
+
+ /* Bus interface */
+ DEVMETHOD(bus_child_pnpinfo_str, ofw_bus_gen_child_pnpinfo_str),
+ DEVMETHOD(bus_add_child, ofw_iicbus_add_child),
+
+ /* ofw_bus interface */
+ DEVMETHOD(ofw_bus_get_devinfo, ofw_iicbus_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 }
+};
+
+struct ofw_iicbus_devinfo {
+ struct iicbus_ivar opd_dinfo;
+ struct ofw_bus_devinfo opd_obdinfo;
+};
+
+static devclass_t ofwiicbus_devclass;
+
+DEFINE_CLASS_1(iicbus, ofw_iicbus_driver, ofw_iicbus_methods, 1 /* no softc */,
+ iicbus_driver);
+DRIVER_MODULE(ofw_iicbus, iichb, ofw_iicbus_driver, ofwiicbus_devclass, 0, 0);
+MODULE_VERSION(ofw_iicbus, 1);
+MODULE_DEPEND(ofw_iicbus, iicbus, 1, 1, 1);
+
+static int
+ofw_iicbus_probe(device_t dev)
+{
+
+ if (ofw_bus_get_node(dev) == 0)
+ return (ENXIO);
+ device_set_desc(dev, "OFW I2C bus");
+
+ return (0);
+}
+
+static int
+ofw_iicbus_attach(device_t dev)
+{
+ struct iicbus_softc *sc = IICBUS_SOFTC(dev);
+ struct ofw_iicbus_devinfo *dinfo;
+ phandle_t node, child;
+ device_t childdev;
+ uint32_t addr;
+
+ sc->dev = dev;
+ mtx_init(&sc->lock, "iicbus", NULL, MTX_DEF);
+ iicbus_reset(dev, IIC_FASTEST, 0, NULL);
+
+ bus_generic_probe(dev);
+ bus_enumerate_hinted_children(dev);
+
+ /*
+ * Attach those children represented in the device tree.
+ */
+
+ node = ofw_bus_get_node(dev);
+
+ for (child = OF_child(node); child != 0; child = OF_peer(child)) {
+ if (OF_getprop(child, "reg", &addr, sizeof(addr)) == -1)
+ continue;
+
+ /*
+ * Now set up the I2C and OFW bus layer devinfo and add it
+ * to the bus.
+ */
+
+ dinfo = malloc(sizeof(struct ofw_iicbus_devinfo), M_DEVBUF,
+ M_NOWAIT | M_ZERO);
+ if (dinfo == NULL)
+ continue;
+ dinfo->opd_dinfo.addr = addr;
+ if (ofw_bus_gen_setup_devinfo(&dinfo->opd_obdinfo, child) !=
+ 0) {
+ free(dinfo, M_DEVBUF);
+ continue;
+ }
+ childdev = device_add_child(dev, NULL, -1);
+ device_set_ivars(childdev, dinfo);
+ }
+
+ return (bus_generic_attach(dev));
+}
+
+static device_t
+ofw_iicbus_add_child(device_t dev, int order, const char *name, int unit)
+{
+ device_t child;
+ struct ofw_iicbus_devinfo *devi;
+
+ child = device_add_child_ordered(dev, order, name, unit);
+ if (child == NULL)
+ return (child);
+ devi = malloc(sizeof(struct ofw_iicbus_devinfo), M_DEVBUF,
+ M_NOWAIT | M_ZERO);
+ if (devi == NULL) {
+ device_delete_child(dev, child);
+ return (0);
+ }
+
+ /* NULL all the OFW-related parts of the ivars for non-OFW children */
+
+ devi->opd_obdinfo.obd_node = -1;
+ devi->opd_obdinfo.obd_name = NULL;
+ devi->opd_obdinfo.obd_compat = NULL;
+ devi->opd_obdinfo.obd_type = NULL;
+ devi->opd_obdinfo.obd_model = NULL;
+
+ device_set_ivars(child, devi);
+
+ return (child);
+}
+
+static const struct ofw_bus_devinfo *
+ofw_iicbus_get_devinfo(device_t bus, device_t dev)
+{
+ struct ofw_iicbus_devinfo *dinfo;
+
+ dinfo = device_get_ivars(dev);
+ return (&dinfo->opd_obdinfo);
+}
+
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