common/fdt_support.c

/*
 * (C) Copyright 2007
 * Gerald Van Baren, Custom IDEAS, vanbaren@cideas.com
 *
 * See file CREDITS for list of people who contributed to this
 * project.
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License as
 * published by the Free Software Foundation; either version 2 of
 * the License, or (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place, Suite 330, Boston,
 * MA 02111-1307 USA
 */

#include <common.h>
#include <linux/ctype.h>
#include <linux/types.h>
#include <asm/global_data.h>
#include <fdt.h>
#include <libfdt.h>
#include <fdt_support.h>
#include <exports.h>

/*
 * Global data (for the gd->bd)
 */
DECLARE_GLOBAL_DATA_PTR;

/*
 * fdt points to our working device tree.
 */
struct fdt_header *fdt;


/**
 * fdt_find_and_setprop: Find a node and set it's property
 *
 * @fdt: ptr to device tree
 * @node: path of node
 * @prop: property name
 * @val: ptr to new value
 * @len: length of new property value
 * @create: flag to create the property if it doesn't exist
 *
 * Convenience function to directly set a property given the path to the node.
 */
int fdt_find_and_setprop(void *fdt, const char *node, const char *prop,
			 const void *val, int len, int create)
{
	int nodeoff = fdt_path_offset(fdt, node);

	if (nodeoff < 0)
		return nodeoff;

	if ((!create) && (fdt_get_property(fdt, nodeoff, prop, 0) == NULL))
		return 0; /* create flag not set; so exit quietly */

	return fdt_setprop(fdt, nodeoff, prop, val, len);
}

#ifdef CONFIG_OF_STDOUT_VIA_ALIAS
static int fdt_fixup_stdout(void *fdt, int choosenoff)
{
	int err = 0;
#ifdef CONFIG_CONS_INDEX
	int node;
	char sername[9] = { 0 };
	const char *path;

	sprintf(sername, "serial%d", CONFIG_CONS_INDEX - 1);

	err = node = fdt_path_offset(fdt, "/aliases");
	if (node >= 0) {
		int len;
		path = fdt_getprop(fdt, node, sername, &len);
		if (path) {
			char *p = malloc(len);
			err = -FDT_ERR_NOSPACE;
			if (p) {
				memcpy(p, path, len);
				err = fdt_setprop(fdt, choosenoff,
					"linux,stdout-path", p, len);
				free(p);
			}
		} else {
			err = len;
		}
	}
#endif
	if (err < 0)
		printf("WARNING: could not set linux,stdout-path %s.\n",
				fdt_strerror(err));

	return err;
}
#endif

int fdt_chosen(void *fdt, ulong initrd_start, ulong initrd_end, int force)
{
	int   nodeoffset;
	int   err;
	u32   tmp;		/* used to set 32 bit integer properties */
	char  *str;		/* used to set string properties */
	const char *path;

	err = fdt_check_header(fdt);
	if (err < 0) {
		printf("fdt_chosen: %s\n", fdt_strerror(err));
		return err;
	}

	if (initrd_start && initrd_end) {
		uint64_t addr, size;
		int  total = fdt_num_mem_rsv(fdt);
		int  j;

		/*
		 * Look for an existing entry and update it.  If we don't find
		 * the entry, we will j be the next available slot.
		 */
		for (j = 0; j < total; j++) {
			err = fdt_get_mem_rsv(fdt, j, &addr, &size);
			if (addr == initrd_start) {
				fdt_del_mem_rsv(fdt, j);
				break;
			}
		}

		err = fdt_add_mem_rsv(fdt, initrd_start, initrd_end - initrd_start + 1);
		if (err < 0) {
			printf("fdt_chosen: %s\n", fdt_strerror(err));
			return err;
		}
	}

	/*
	 * Find the "chosen" node.
	 */
	nodeoffset = fdt_path_offset (fdt, "/chosen");

	/*
	 * If there is no "chosen" node in the blob, create it.
	 */
	if (nodeoffset < 0) {
		/*
		 * Create a new node "/chosen" (offset 0 is root level)
		 */
		nodeoffset = fdt_add_subnode(fdt, 0, "chosen");
		if (nodeoffset < 0) {
			printf("WARNING: could not create /chosen %s.\n",
				fdt_strerror(nodeoffset));
			return nodeoffset;
		}
	}

	/*
	 * Create /chosen properites that don't exist in the fdt.
	 * If the property exists, update it only if the "force" parameter
	 * is true.
	 */
	str = getenv("bootargs");
	if (str != NULL) {
		path = fdt_getprop(fdt, nodeoffset, "bootargs", NULL);
		if ((path == NULL) || force) {
			err = fdt_setprop(fdt, nodeoffset,
				"bootargs", str, strlen(str)+1);
			if (err < 0)
				printf("WARNING: could not set bootargs %s.\n",
					fdt_strerror(err));
		}
	}
	if (initrd_start && initrd_end) {
		path = fdt_getprop(fdt, nodeoffset, "linux,initrd-start", NULL);
		if ((path == NULL) || force) {
			tmp = __cpu_to_be32(initrd_start);
			err = fdt_setprop(fdt, nodeoffset,
				"linux,initrd-start", &tmp, sizeof(tmp));
			if (err < 0)
				printf("WARNING: "
					"could not set linux,initrd-start %s.\n",
					fdt_strerror(err));
			tmp = __cpu_to_be32(initrd_end);
			err = fdt_setprop(fdt, nodeoffset,
				"linux,initrd-end", &tmp, sizeof(tmp));
			if (err < 0)
				printf("WARNING: could not set linux,initrd-end %s.\n",
					fdt_strerror(err));
		}
	}

#ifdef CONFIG_OF_STDOUT_VIA_ALIAS
	path = fdt_getprop(fdt, nodeoffset, "linux,stdout-path", NULL);
	if ((path == NULL) || force)
		err = fdt_fixup_stdout(fdt, nodeoffset);
#endif

#ifdef OF_STDOUT_PATH
	path = fdt_getprop(fdt, nodeoffset, "linux,stdout-path", NULL);
	if ((path == NULL) || force) {
		err = fdt_setprop(fdt, nodeoffset,
			"linux,stdout-path", OF_STDOUT_PATH, strlen(OF_STDOUT_PATH)+1);
		if (err < 0)
			printf("WARNING: could not set linux,stdout-path %s.\n",
				fdt_strerror(err));
	}
#endif

	return err;
}

void do_fixup_by_path(void *fdt, const char *path, const char *prop,
		      const void *val, int len, int create)
{
#if defined(DEBUG)
	int i;
	debug("Updating property '%s/%s' = ", path, prop);
	for (i = 0; i < len; i++)
		debug(" %.2x", *(u8*)(val+i));
	debug("\n");
#endif
	int rc = fdt_find_and_setprop(fdt, path, prop, val, len, create);
	if (rc)
		printf("Unable to update property %s:%s, err=%s\n",
			path, prop, fdt_strerror(rc));
}

void do_fixup_by_path_u32(void *fdt, const char *path, const char *prop,
			  u32 val, int create)
{
	val = cpu_to_fdt32(val);
	do_fixup_by_path(fdt, path, prop, &val, sizeof(val), create);
}

void do_fixup_by_prop(void *fdt,
		      const char *pname, const void *pval, int plen,
		      const char *prop, const void *val, int len,
		      int create)
{
	int off;
#if defined(DEBUG)
	int i;
	debug("Updating property '%s' = ", prop);
	for (i = 0; i < len; i++)
		debug(" %.2x", *(u8*)(val+i));
	debug("\n");
#endif
	off = fdt_node_offset_by_prop_value(fdt, -1, pname, pval, plen);
	while (off != -FDT_ERR_NOTFOUND) {
		if (create || (fdt_get_property(fdt, off, prop, 0) != NULL))
			fdt_setprop(fdt, off, prop, val, len);
		off = fdt_node_offset_by_prop_value(fdt, off, pname, pval, plen);
	}
}

void do_fixup_by_prop_u32(void *fdt,
			  const char *pname, const void *pval, int plen,
			  const char *prop, u32 val, int create)
{
	val = cpu_to_fdt32(val);
	do_fixup_by_prop(fdt, pname, pval, plen, prop, &val, 4, create);
}

void do_fixup_by_compat(void *fdt, const char *compat,
			const char *prop, const void *val, int len, int create)
{
	int off = -1;
#if defined(DEBUG)
	int i;
	debug("Updating property '%s' = ", prop);
	for (i = 0; i < len; i++)
		debug(" %.2x", *(u8*)(val+i));
	debug("\n");
#endif
	off = fdt_node_offset_by_compatible(fdt, -1, compat);
	while (off != -FDT_ERR_NOTFOUND) {
		if (create || (fdt_get_property(fdt, off, prop, 0) != NULL))
			fdt_setprop(fdt, off, prop, val, len);
		off = fdt_node_offset_by_compatible(fdt, off, compat);
	}
}

void do_fixup_by_compat_u32(void *fdt, const char *compat,
			    const char *prop, u32 val, int create)
{
	val = cpu_to_fdt32(val);
	do_fixup_by_compat(fdt, compat, prop, &val, 4, create);
}

int fdt_fixup_memory(void *blob, u64 start, u64 size)
{
	int err, nodeoffset, len = 0;
	u8 tmp[16];
	const u32 *addrcell, *sizecell;

	err = fdt_check_header(blob);
	if (err < 0) {
		printf("%s: %s\n", __FUNCTION__, fdt_strerror(err));
		return err;
	}

	/* update, or add and update /memory node */
	nodeoffset = fdt_path_offset(blob, "/memory");
	if (nodeoffset < 0) {
		nodeoffset = fdt_add_subnode(blob, 0, "memory");
		if (nodeoffset < 0)
			printf("WARNING: could not create /memory: %s.\n",
					fdt_strerror(nodeoffset));
		return nodeoffset;
	}
	err = fdt_setprop(blob, nodeoffset, "device_type", "memory",
			sizeof("memory"));
	if (err < 0) {
		printf("WARNING: could not set %s %s.\n", "device_type",
				fdt_strerror(err));
		return err;
	}

	addrcell = fdt_getprop(blob, 0, "#address-cells", NULL);
	/* use shifts and mask to ensure endianness */
	if ((addrcell) && (*addrcell == 2)) {
		tmp[0] = (start >> 56) & 0xff;
		tmp[1] = (start >> 48) & 0xff;
		tmp[2] = (start >> 40) & 0xff;
		tmp[3] = (start >> 32) & 0xff;
		tmp[4] = (start >> 24) & 0xff;
		tmp[5] = (start >> 16) & 0xff;
		tmp[6] = (start >>  8) & 0xff;
		tmp[7] = (start      ) & 0xff;
		len = 8;
	} else {
		tmp[0] = (start >> 24) & 0xff;
		tmp[1] = (start >> 16) & 0xff;
		tmp[2] = (start >>  8) & 0xff;
		tmp[3] = (start      ) & 0xff;
		len = 4;
	}

	sizecell = fdt_getprop(blob, 0, "#size-cells", NULL);
	/* use shifts and mask to ensure endianness */
	if ((sizecell) && (*sizecell == 2)) {
		tmp[0+len] = (size >> 56) & 0xff;
		tmp[1+len] = (size >> 48) & 0xff;
		tmp[2+len] = (size >> 40) & 0xff;
		tmp[3+len] = (size >> 32) & 0xff;
		tmp[4+len] = (size >> 24) & 0xff;
		tmp[5+len] = (size >> 16) & 0xff;
		tmp[6+len] = (size >>  8) & 0xff;
		tmp[7+len] = (size      ) & 0xff;
		len += 8;
	} else {
		tmp[0+len] = (size >> 24) & 0xff;
		tmp[1+len] = (size >> 16) & 0xff;
		tmp[2+len] = (size >>  8) & 0xff;
		tmp[3+len] = (size      ) & 0xff;
		len += 4;
	}

	err = fdt_setprop(blob, nodeoffset, "reg", tmp, len);
	if (err < 0) {
		printf("WARNING: could not set %s %s.\n",
				"reg", fdt_strerror(err));
		return err;
	}
	return 0;
}

#if defined(CONFIG_HAS_ETH0) || defined(CONFIG_HAS_ETH1) ||\
    defined(CONFIG_HAS_ETH2) || defined(CONFIG_HAS_ETH3)

void fdt_fixup_ethernet(void *fdt, bd_t *bd)
{
	int node;
	const char *path;

	node = fdt_path_offset(fdt, "/aliases");
	if (node >= 0) {
#if defined(CONFIG_HAS_ETH0)
		path = fdt_getprop(fdt, node, "ethernet0", NULL);
		if (path) {
			do_fixup_by_path(fdt, path, "mac-address",
				bd->bi_enetaddr, 6, 0);
			do_fixup_by_path(fdt, path, "local-mac-address",
				bd->bi_enetaddr, 6, 1);
		}
#endif
#if defined(CONFIG_HAS_ETH1)
		path = fdt_getprop(fdt, node, "ethernet1", NULL);
		if (path) {
			do_fixup_by_path(fdt, path, "mac-address",
				bd->bi_enet1addr, 6, 0);
			do_fixup_by_path(fdt, path, "local-mac-address",
				bd->bi_enet1addr, 6, 1);
		}
#endif
#if defined(CONFIG_HAS_ETH2)
		path = fdt_getprop(fdt, node, "ethernet2", NULL);
		if (path) {
			do_fixup_by_path(fdt, path, "mac-address",
				bd->bi_enet2addr, 6, 0);
			do_fixup_by_path(fdt, path, "local-mac-address",
				bd->bi_enet2addr, 6, 1);
		}
#endif
#if defined(CONFIG_HAS_ETH3)
		path = fdt_getprop(fdt, node, "ethernet3", NULL);
		if (path) {
			do_fixup_by_path(fdt, path, "mac-address",
				bd->bi_enet3addr, 6, 0);
			do_fixup_by_path(fdt, path, "local-mac-address",
				bd->bi_enet3addr, 6, 1);
		}
#endif
	}
}
#endif