svn commit: r208615 - head/sys/dev/ofw
Rafal Jaworowski
raj at FreeBSD.org
Fri May 28 10:51:45 UTC 2010
Author: raj
Date: Fri May 28 10:51:44 2010
New Revision: 208615
URL: http://svn.freebsd.org/changeset/base/208615
Log:
Initial implementation of the OFW i/f methods for FDT back-end.
Reviewed by: imp
Sponsored by: The FreeBSD Foundation
Added:
head/sys/dev/ofw/ofw_fdt.c (contents, props changed)
Added: head/sys/dev/ofw/ofw_fdt.c
==============================================================================
--- /dev/null 00:00:00 1970 (empty, because file is newly added)
+++ head/sys/dev/ofw/ofw_fdt.c Fri May 28 10:51:44 2010 (r208615)
@@ -0,0 +1,458 @@
+/*-
+ * 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/kernel.h>
+#include <sys/malloc.h>
+#include <sys/systm.h>
+
+#include <contrib/libfdt/libfdt.h>
+
+#include <machine/stdarg.h>
+
+#include <dev/fdt/fdt_common.h>
+#include <dev/ofw/ofwvar.h>
+#include <dev/ofw/openfirm.h>
+
+#include "ofw_if.h"
+
+#ifdef DEBUG
+#define debugf(fmt, args...) do { printf("%s(): ", __func__); \
+ printf(fmt,##args); } while (0)
+#else
+#define debugf(fmt, args...)
+#endif
+
+static int ofw_fdt_init(ofw_t, void *);
+static phandle_t ofw_fdt_peer(ofw_t, phandle_t);
+static phandle_t ofw_fdt_child(ofw_t, phandle_t);
+static phandle_t ofw_fdt_parent(ofw_t, phandle_t);
+static phandle_t ofw_fdt_instance_to_package(ofw_t, ihandle_t);
+static ssize_t ofw_fdt_getproplen(ofw_t, phandle_t, const char *);
+static ssize_t ofw_fdt_getprop(ofw_t, phandle_t, const char *, void *, size_t);
+static int ofw_fdt_nextprop(ofw_t, phandle_t, const char *, char *, size_t);
+static int ofw_fdt_setprop(ofw_t, phandle_t, const char *, const void *,
+ size_t);
+static ssize_t ofw_fdt_canon(ofw_t, const char *, char *, size_t);
+static phandle_t ofw_fdt_finddevice(ofw_t, const char *);
+static ssize_t ofw_fdt_instance_to_path(ofw_t, ihandle_t, char *, size_t);
+static ssize_t ofw_fdt_package_to_path(ofw_t, phandle_t, char *, size_t);
+static int ofw_fdt_interpret(ofw_t, const char *, int, unsigned long *);
+
+static ofw_method_t ofw_fdt_methods[] = {
+ OFWMETHOD(ofw_init, ofw_fdt_init),
+ OFWMETHOD(ofw_peer, ofw_fdt_peer),
+ OFWMETHOD(ofw_child, ofw_fdt_child),
+ OFWMETHOD(ofw_parent, ofw_fdt_parent),
+ OFWMETHOD(ofw_instance_to_package, ofw_fdt_instance_to_package),
+ OFWMETHOD(ofw_getproplen, ofw_fdt_getproplen),
+ OFWMETHOD(ofw_getprop, ofw_fdt_getprop),
+ OFWMETHOD(ofw_nextprop, ofw_fdt_nextprop),
+ OFWMETHOD(ofw_setprop, ofw_fdt_setprop),
+ OFWMETHOD(ofw_canon, ofw_fdt_canon),
+ OFWMETHOD(ofw_finddevice, ofw_fdt_finddevice),
+ OFWMETHOD(ofw_instance_to_path, ofw_fdt_instance_to_path),
+ OFWMETHOD(ofw_package_to_path, ofw_fdt_package_to_path),
+ OFWMETHOD(ofw_interpret, ofw_fdt_interpret),
+ { 0, 0 }
+};
+
+static ofw_def_t ofw_fdt = {
+ OFW_FDT,
+ ofw_fdt_methods,
+ 0
+};
+OFW_DEF(ofw_fdt);
+
+static void *fdtp = NULL;
+
+static int
+ofw_fdt_init(ofw_t ofw, void *data)
+{
+ int err;
+
+ /* Check FDT blob integrity */
+ if ((err = fdt_check_header(data)) != 0)
+ return (err);
+
+ fdtp = data;
+ return (0);
+}
+
+/*
+ * Device tree functions
+ */
+
+static int
+fdt_phandle_offset(phandle_t p)
+{
+ const char *dt_struct;
+ int offset;
+
+ dt_struct = (const char *)fdtp + fdt_off_dt_struct(fdtp);
+
+ if (((const char *)p < dt_struct) ||
+ (const char *)p > (dt_struct + fdt_size_dt_struct(fdtp)))
+ return (-1);
+
+ offset = (const char *)p - dt_struct;
+ if (offset < 0)
+ return (-1);
+
+ return (offset);
+}
+
+/* Return the next sibling of this node or 0. */
+static phandle_t
+ofw_fdt_peer(ofw_t ofw, phandle_t node)
+{
+ phandle_t p;
+ int depth, offset;
+
+ if (node == 0) {
+ /* Find root node */
+ offset = fdt_path_offset(fdtp, "/");
+ p = (phandle_t)fdt_offset_ptr(fdtp, offset, sizeof(p));
+
+ return (p);
+ }
+
+ offset = fdt_phandle_offset(node);
+ if (offset < 0)
+ return (0);
+
+ for (depth = 1, offset = fdt_next_node(fdtp, offset, &depth);
+ offset >= 0;
+ offset = fdt_next_node(fdtp, offset, &depth)) {
+ if (depth < 0)
+ return (0);
+ if (depth == 1) {
+ p = (phandle_t)fdt_offset_ptr(fdtp, offset, sizeof(p));
+ return (p);
+ }
+ }
+
+ return (0);
+}
+
+/* Return the first child of this node or 0. */
+static phandle_t
+ofw_fdt_child(ofw_t ofw, phandle_t node)
+{
+ phandle_t p;
+ int depth, offset;
+
+ offset = fdt_phandle_offset(node);
+ if (offset < 0)
+ return (0);
+
+ for (depth = 0, offset = fdt_next_node(fdtp, offset, &depth);
+ (offset >= 0) && (depth > 0);
+ offset = fdt_next_node(fdtp, offset, &depth)) {
+ if (depth < 0)
+ return (0);
+ if (depth == 1) {
+ p = (phandle_t)fdt_offset_ptr(fdtp, offset, sizeof(p));
+ return (p);
+ }
+ }
+
+ return (0);
+}
+
+/* Return the parent of this node or 0. */
+static phandle_t
+ofw_fdt_parent(ofw_t ofw, phandle_t node)
+{
+ phandle_t p;
+ int offset, paroffset;
+
+ offset = fdt_phandle_offset(node);
+ if (offset < 0)
+ return (0);
+
+ paroffset = fdt_parent_offset(fdtp, offset);
+ p = (phandle_t)fdt_offset_ptr(fdtp, paroffset, sizeof(phandle_t));
+ return (p);
+}
+
+/* Return the package handle that corresponds to an instance handle. */
+static phandle_t
+ofw_fdt_instance_to_package(ofw_t ofw, ihandle_t instance)
+{
+ phandle_t p;
+ int offset;
+
+ /*
+ * Note: FDT does not have the notion of instances, but we somewhat
+ * abuse the semantics and let treat as 'instance' the internal
+ * 'phandle' prop, so that ofw I/F consumers have a uniform way of
+ * translation between internal representation (which appear in some
+ * contexts as property values) and effective phandles.
+ */
+ offset = fdt_node_offset_by_phandle(fdtp, instance);
+ if (offset < 0)
+ return (0);
+
+ p = (phandle_t)fdt_offset_ptr(fdtp, offset, sizeof(phandle_t));
+ return (p);
+}
+
+/* Get the length of a property of a package. */
+static ssize_t
+ofw_fdt_getproplen(ofw_t ofw, phandle_t package, const char *propname)
+{
+ const struct fdt_property *prop;
+ int offset, len;
+
+ offset = fdt_phandle_offset(package);
+ if (offset < 0)
+ return (0);
+
+ if (strcmp(propname, "name") == 0) {
+ /* Emulate the 'name' property */
+ fdt_get_name(fdtp, offset, &len);
+ return (len + 1);
+ }
+
+ len = 0;
+ prop = fdt_get_property(fdtp, offset, propname, &len);
+
+ return (len);
+}
+
+/* Get the value of a property of a package. */
+static ssize_t
+ofw_fdt_getprop(ofw_t ofw, phandle_t package, const char *propname, void *buf,
+ size_t buflen)
+{
+ const void *prop;
+ const char *name;
+ int len, offset;
+
+ offset = fdt_phandle_offset(package);
+ if (offset < 0)
+ return (0);
+
+ if (strcmp(propname, "name") == 0) {
+ /* Emulate the 'name' property */
+ name = fdt_get_name(fdtp, offset, &len);
+ strncpy(buf, name, buflen);
+ if (len + 1 > buflen)
+ len = buflen;
+ return (len + 1);
+ }
+
+ prop = fdt_getprop(fdtp, offset, propname, &len);
+ if (prop == NULL)
+ return (0);
+
+ if (len > buflen)
+ len = buflen;
+ bcopy(prop, buf, len);
+ return (len);
+}
+
+static int
+fdt_nextprop(int offset, char *buf, size_t size)
+{
+ const struct fdt_property *prop;
+ const char *name;
+ uint32_t tag;
+ int nextoffset, depth;
+
+ depth = 0;
+ tag = fdt_next_tag(fdtp, offset, &nextoffset);
+
+ /* Find the next prop */
+ do {
+ offset = nextoffset;
+ tag = fdt_next_tag(fdtp, offset, &nextoffset);
+
+ if (tag == FDT_BEGIN_NODE)
+ depth++;
+ else if (tag == FDT_END_NODE)
+ depth--;
+ else if ((tag == FDT_PROP) && (depth == 0)) {
+ prop =
+ (const struct fdt_property *)fdt_offset_ptr(fdtp,
+ offset, sizeof(*prop));
+ name = fdt_string(fdtp,
+ fdt32_to_cpu(prop->nameoff));
+ strncpy(buf, name, size);
+ return (strlen(name));
+ } else
+ depth = -1;
+ } while (depth >= 0);
+
+ return (0);
+}
+
+/*
+ * Get the next property of a package. Return the actual len of retrieved
+ * prop name.
+ */
+static int
+ofw_fdt_nextprop(ofw_t ofw, phandle_t package, const char *previous, char *buf,
+ size_t size)
+{
+ const struct fdt_property *prop;
+ int offset, rv;
+
+ offset = fdt_phandle_offset(package);
+ if (offset < 0)
+ return (0);
+
+ if (previous == NULL)
+ /* Find the first prop in the node */
+ return (fdt_nextprop(offset, buf, size));
+
+ /*
+ * Advance to the previous prop
+ */
+ prop = fdt_get_property(fdtp, offset, previous, NULL);
+ if (prop == NULL)
+ return (0);
+
+ offset = fdt_phandle_offset((phandle_t)prop);
+ rv = fdt_nextprop(offset, buf, size);
+ return (rv);
+}
+
+/* Set the value of a property of a package. */
+static int
+ofw_fdt_setprop(ofw_t ofw, phandle_t package, const char *propname,
+ const void *buf, size_t len)
+{
+ int offset;
+
+ offset = fdt_phandle_offset(package);
+ if (offset < 0)
+ return (-1);
+
+ return (fdt_setprop_inplace(fdtp, offset, propname, buf, len));
+}
+
+/* Convert a device specifier to a fully qualified pathname. */
+static ssize_t
+ofw_fdt_canon(ofw_t ofw, const char *device, char *buf, size_t len)
+{
+
+ return (-1);
+}
+
+/* Return a package handle for the specified device. */
+static phandle_t
+ofw_fdt_finddevice(ofw_t ofw, const char *device)
+{
+ phandle_t p;
+ int offset;
+
+ offset = fdt_path_offset(fdtp, device);
+
+ p = (phandle_t)fdt_offset_ptr(fdtp, offset, sizeof(p));
+
+ return (p);
+}
+
+/* Return the fully qualified pathname corresponding to an instance. */
+static ssize_t
+ofw_fdt_instance_to_path(ofw_t ofw, ihandle_t instance, char *buf, size_t len)
+{
+
+ return (-1);
+}
+
+/* Return the fully qualified pathname corresponding to a package. */
+static ssize_t
+ofw_fdt_package_to_path(ofw_t ofw, phandle_t package, char *buf, size_t len)
+{
+
+ return (-1);
+}
+
+static int
+ofw_fdt_fixup(ofw_t ofw)
+{
+#define FDT_MODEL_LEN 80
+ char model[FDT_MODEL_LEN];
+ phandle_t root;
+ ssize_t len;
+ int i;
+
+ if ((root = ofw_fdt_finddevice(ofw, "/")) == 0)
+ return (ENODEV);
+
+ if ((len = ofw_fdt_getproplen(ofw, root, "model")) <= 0)
+ return (0);
+
+ bzero(model, FDT_MODEL_LEN);
+ if (ofw_fdt_getprop(ofw, root, "model", model, FDT_MODEL_LEN) <= 0)
+ return (0);
+
+ /*
+ * Search fixup table and call handler if appropriate.
+ */
+ for (i = 0; fdt_fixup_table[i].model != NULL; i++) {
+ if (strncmp(model, fdt_fixup_table[i].model,
+ FDT_MODEL_LEN) != 0)
+ continue;
+
+ if (fdt_fixup_table[i].handler != NULL)
+ (*fdt_fixup_table[i].handler)(root);
+ }
+
+ return (0);
+}
+
+static int
+ofw_fdt_interpret(ofw_t ofw, const char *cmd, int nret, unsigned long *retvals)
+{
+ int rv;
+
+ /*
+ * Note: FDT does not have the possibility to 'interpret' commands,
+ * but we abuse the interface a bit to use it for doing non-standard
+ * operations on the device tree blob.
+ *
+ * Currently the only supported 'command' is to trigger performing
+ * fixups.
+ */
+ if (strncmp("perform-fixup", cmd, 13) != 0)
+ return (0);
+
+ rv = ofw_fdt_fixup(ofw);
+ if (nret > 0)
+ retvals[0] = rv;
+
+ return (rv);
+}
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