Merge branch 'u-boot-ti/master' into 'u-boot-arm/master'

[people/ms/u-boot.git] / common / fdt_support.c

/*
 * (C) Copyright 2007
 * Gerald Van Baren, Custom IDEAS, vanbaren@cideas.com
 *
 * Copyright 2010-2011 Freescale Semiconductor, Inc.
 *
 * 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 <stdio_dev.h>
#include <linux/ctype.h>
#include <linux/types.h>
#include <asm/global_data.h>
#include <libfdt.h>
#include <fdt_support.h>
#include <exports.h>

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

/**
 * fdt_getprop_u32_default - Find a node and return it's property or a default
 *
 * @fdt: ptr to device tree
 * @path: path of node
 * @prop: property name
 * @dflt: default value if the property isn't found
 *
 * Convenience function to find a node and return it's property or a
 * default value if it doesn't exist.
 */
u32 fdt_getprop_u32_default(const void *fdt, const char *path,
                                const char *prop, const u32 dflt)
{
        const fdt32_t *val;
        int off;

        off = fdt_path_offset(fdt, path);
        if (off < 0)
                return dflt;

        val = fdt_getprop(fdt, off, prop, NULL);
        if (val)
                return fdt32_to_cpu(*val);
        else
                return dflt;
}

/**
 * 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, NULL) == NULL))
                return 0; /* create flag not set; so exit quietly */

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

#ifdef CONFIG_OF_STDOUT_VIA_ALIAS

#ifdef CONFIG_CONS_INDEX
static void fdt_fill_multisername(char *sername, size_t maxlen)
{
        const char *outname = stdio_devices[stdout]->name;

        if (strcmp(outname, "serial") > 0)
                strncpy(sername, outname, maxlen);

        /* eserial? */
        if (strcmp(outname + 1, "serial") > 0)
                strncpy(sername, outname + 1, maxlen);
}
#endif

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

        fdt_fill_multisername(sername, sizeof(sername) - 1);
        if (!sername[0])
                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, chosenoff,
                                        "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_initrd(void *fdt, ulong initrd_start, ulong initrd_end, int force)
{
        int   nodeoffset;
        int   err, j, total;
        fdt32_t  tmp;
        const char *path;
        uint64_t addr, size;

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

        /* If there is no "chosen" node in the blob return */
        if (nodeoffset < 0) {
                printf("fdt_initrd: %s\n", fdt_strerror(nodeoffset));
                return nodeoffset;
        }

        /* just return if initrd_start/end aren't valid */
        if ((initrd_start == 0) || (initrd_end == 0))
                return 0;

        total = fdt_num_mem_rsv(fdt);

        /*
         * 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);
        if (err < 0) {
                printf("fdt_initrd: %s\n", fdt_strerror(err));
                return err;
        }

        path = fdt_getprop(fdt, nodeoffset, "linux,initrd-start", NULL);
        if ((path == NULL) || force) {
                tmp = cpu_to_fdt32(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));
                        return err;
                }
                tmp = cpu_to_fdt32(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));

                        return err;
                }
        }

        return 0;
}

int fdt_chosen(void *fdt, int force)
{
        int   nodeoffset;
        int   err;
        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;
        }

        /*
         * 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));
                }
        }

#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)
{
        fdt32_t tmp = cpu_to_fdt32(val);
        do_fixup_by_path(fdt, path, prop, &tmp, sizeof(tmp), 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, NULL) != 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)
{
        fdt32_t tmp = cpu_to_fdt32(val);
        do_fixup_by_prop(fdt, pname, pval, plen, prop, &tmp, 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, NULL) != 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)
{
        fdt32_t tmp = cpu_to_fdt32(val);
        do_fixup_by_compat(fdt, compat, prop, &tmp, 4, create);
}

/*
 * Get cells len in bytes
 *     if #NNNN-cells property is 2 then len is 8
 *     otherwise len is 4
 */
static int get_cells_len(void *blob, char *nr_cells_name)
{
        const fdt32_t *cell;

        cell = fdt_getprop(blob, 0, nr_cells_name, NULL);
        if (cell && fdt32_to_cpu(*cell) == 2)
                return 8;

        return 4;
}

/*
 * Write a 4 or 8 byte big endian cell
 */
static void write_cell(u8 *addr, u64 val, int size)
{
        int shift = (size - 1) * 8;
        while (size-- > 0) {
                *addr++ = (val >> shift) & 0xff;
                shift -= 8;
        }
}

#ifdef CONFIG_NR_DRAM_BANKS
#define MEMORY_BANKS_MAX CONFIG_NR_DRAM_BANKS
#else
#define MEMORY_BANKS_MAX 4
#endif
int fdt_fixup_memory_banks(void *blob, u64 start[], u64 size[], int banks)
{
        int err, nodeoffset;
        int addr_cell_len, size_cell_len, len;
        u8 tmp[MEMORY_BANKS_MAX * 16]; /* Up to 64-bit address + 64-bit size */
        int bank;

        if (banks > MEMORY_BANKS_MAX) {
                printf("%s: num banks %d exceeds hardcoded limit %d."
                       " Recompile with higher MEMORY_BANKS_MAX?\n",
                       __FUNCTION__, banks, MEMORY_BANKS_MAX);
                return -1;
        }

        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;
        }

        addr_cell_len = get_cells_len(blob, "#address-cells");
        size_cell_len = get_cells_len(blob, "#size-cells");

        for (bank = 0, len = 0; bank < banks; bank++) {
                write_cell(tmp + len, start[bank], addr_cell_len);
                len += addr_cell_len;

                write_cell(tmp + len, size[bank], size_cell_len);
                len += size_cell_len;
        }

        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;
}

int fdt_fixup_memory(void *blob, u64 start, u64 size)
{
        return fdt_fixup_memory_banks(blob, &start, &size, 1);
}

void fdt_fixup_ethernet(void *fdt)
{
        int node, i, j;
        char enet[16], *tmp, *end;
        char mac[16] = "ethaddr";
        const char *path;
        unsigned char mac_addr[6];

        node = fdt_path_offset(fdt, "/aliases");
        if (node < 0)
                return;

        i = 0;
        while ((tmp = getenv(mac)) != NULL) {
                sprintf(enet, "ethernet%d", i);
                path = fdt_getprop(fdt, node, enet, NULL);
                if (!path) {
                        debug("No alias for %s\n", enet);
                        sprintf(mac, "eth%daddr", ++i);
                        continue;
                }

                for (j = 0; j < 6; j++) {
                        mac_addr[j] = tmp ? simple_strtoul(tmp, &end, 16) : 0;
                        if (tmp)
                                tmp = (*end) ? end+1 : end;
                }

                do_fixup_by_path(fdt, path, "mac-address", &mac_addr, 6, 0);
                do_fixup_by_path(fdt, path, "local-mac-address",
                                &mac_addr, 6, 1);

                sprintf(mac, "eth%daddr", ++i);
        }
}

/* Resize the fdt to its actual size + a bit of padding */
int fdt_resize(void *blob)
{
        int i;
        uint64_t addr, size;
        int total, ret;
        uint actualsize;

        if (!blob)
                return 0;

        total = fdt_num_mem_rsv(blob);
        for (i = 0; i < total; i++) {
                fdt_get_mem_rsv(blob, i, &addr, &size);
                if (addr == (uintptr_t)blob) {
                        fdt_del_mem_rsv(blob, i);
                        break;
                }
        }

        /*
         * Calculate the actual size of the fdt
         * plus the size needed for 5 fdt_add_mem_rsv, one
         * for the fdt itself and 4 for a possible initrd
         * ((initrd-start + initrd-end) * 2 (name & value))
         */
        actualsize = fdt_off_dt_strings(blob) +
                fdt_size_dt_strings(blob) + 5 * sizeof(struct fdt_reserve_entry);

        /* Make it so the fdt ends on a page boundary */
        actualsize = ALIGN(actualsize + ((uintptr_t)blob & 0xfff), 0x1000);
        actualsize = actualsize - ((uintptr_t)blob & 0xfff);

        /* Change the fdt header to reflect the correct size */
        fdt_set_totalsize(blob, actualsize);

        /* Add the new reservation */
        ret = fdt_add_mem_rsv(blob, (uintptr_t)blob, actualsize);
        if (ret < 0)
                return ret;

        return actualsize;
}

#ifdef CONFIG_PCI
#define CONFIG_SYS_PCI_NR_INBOUND_WIN 4

#define FDT_PCI_PREFETCH        (0x40000000)
#define FDT_PCI_MEM32           (0x02000000)
#define FDT_PCI_IO              (0x01000000)
#define FDT_PCI_MEM64           (0x03000000)

int fdt_pci_dma_ranges(void *blob, int phb_off, struct pci_controller *hose) {

        int addrcell, sizecell, len, r;
        u32 *dma_range;
        /* sized based on pci addr cells, size-cells, & address-cells */
        u32 dma_ranges[(3 + 2 + 2) * CONFIG_SYS_PCI_NR_INBOUND_WIN];

        addrcell = fdt_getprop_u32_default(blob, "/", "#address-cells", 1);
        sizecell = fdt_getprop_u32_default(blob, "/", "#size-cells", 1);

        dma_range = &dma_ranges[0];
        for (r = 0; r < hose->region_count; r++) {
                u64 bus_start, phys_start, size;

                /* skip if !PCI_REGION_SYS_MEMORY */
                if (!(hose->regions[r].flags & PCI_REGION_SYS_MEMORY))
                        continue;

                bus_start = (u64)hose->regions[r].bus_start;
                phys_start = (u64)hose->regions[r].phys_start;
                size = (u64)hose->regions[r].size;

                dma_range[0] = 0;
                if (size >= 0x100000000ull)
                        dma_range[0] |= FDT_PCI_MEM64;
                else
                        dma_range[0] |= FDT_PCI_MEM32;
                if (hose->regions[r].flags & PCI_REGION_PREFETCH)
                        dma_range[0] |= FDT_PCI_PREFETCH;
#ifdef CONFIG_SYS_PCI_64BIT
                dma_range[1] = bus_start >> 32;
#else
                dma_range[1] = 0;
#endif
                dma_range[2] = bus_start & 0xffffffff;

                if (addrcell == 2) {
                        dma_range[3] = phys_start >> 32;
                        dma_range[4] = phys_start & 0xffffffff;
                } else {
                        dma_range[3] = phys_start & 0xffffffff;
                }

                if (sizecell == 2) {
                        dma_range[3 + addrcell + 0] = size >> 32;
                        dma_range[3 + addrcell + 1] = size & 0xffffffff;
                } else {
                        dma_range[3 + addrcell + 0] = size & 0xffffffff;
                }

                dma_range += (3 + addrcell + sizecell);
        }

        len = dma_range - &dma_ranges[0];
        if (len)
                fdt_setprop(blob, phb_off, "dma-ranges", &dma_ranges[0], len*4);

        return 0;
}
#endif

#ifdef CONFIG_FDT_FIXUP_NOR_FLASH_SIZE
/*
 * Provide a weak default function to return the flash bank size.
 * There might be multiple non-identical flash chips connected to one
 * chip-select, so we need to pass an index as well.
 */
u32 __flash_get_bank_size(int cs, int idx)
{
        extern flash_info_t flash_info[];

        /*
         * As default, a simple 1:1 mapping is provided. Boards with
         * a different mapping need to supply a board specific mapping
         * routine.
         */
        return flash_info[cs].size;
}
u32 flash_get_bank_size(int cs, int idx)
        __attribute__((weak, alias("__flash_get_bank_size")));

/*
 * This function can be used to update the size in the "reg" property
 * of all NOR FLASH device nodes. This is necessary for boards with
 * non-fixed NOR FLASH sizes.
 */
int fdt_fixup_nor_flash_size(void *blob)
{
        char compat[][16] = { "cfi-flash", "jedec-flash" };
        int off;
        int len;
        struct fdt_property *prop;
        u32 *reg, *reg2;
        int i;

        for (i = 0; i < 2; i++) {
                off = fdt_node_offset_by_compatible(blob, -1, compat[i]);
                while (off != -FDT_ERR_NOTFOUND) {
                        int idx;

                        /*
                         * Found one compatible node, so fixup the size
                         * int its reg properties
                         */
                        prop = fdt_get_property_w(blob, off, "reg", &len);
                        if (prop) {
                                int tuple_size = 3 * sizeof(reg);

                                /*
                                 * There might be multiple reg-tuples,
                                 * so loop through them all
                                 */
                                reg = reg2 = (u32 *)&prop->data[0];
                                for (idx = 0; idx < (len / tuple_size); idx++) {
                                        /*
                                         * Update size in reg property
                                         */
                                        reg[2] = flash_get_bank_size(reg[0],
                                                                     idx);

                                        /*
                                         * Point to next reg tuple
                                         */
                                        reg += 3;
                                }

                                fdt_setprop(blob, off, "reg", reg2, len);
                        }

                        /* Move to next compatible node */
                        off = fdt_node_offset_by_compatible(blob, off,
                                                            compat[i]);
                }
        }

        return 0;
}
#endif

int fdt_increase_size(void *fdt, int add_len)
{
        int newlen;

        newlen = fdt_totalsize(fdt) + add_len;

        /* Open in place with a new len */
        return fdt_open_into(fdt, fdt, newlen);
}

#ifdef CONFIG_FDT_FIXUP_PARTITIONS
#include <jffs2/load_kernel.h>
#include <mtd_node.h>

struct reg_cell {
        unsigned int r0;
        unsigned int r1;
};

int fdt_del_subnodes(const void *blob, int parent_offset)
{
        int off, ndepth;
        int ret;

        for (ndepth = 0, off = fdt_next_node(blob, parent_offset, &ndepth);
             (off >= 0) && (ndepth > 0);
             off = fdt_next_node(blob, off, &ndepth)) {
                if (ndepth == 1) {
                        debug("delete %s: offset: %x\n",
                                fdt_get_name(blob, off, 0), off);
                        ret = fdt_del_node((void *)blob, off);
                        if (ret < 0) {
                                printf("Can't delete node: %s\n",
                                        fdt_strerror(ret));
                                return ret;
                        } else {
                                ndepth = 0;
                                off = parent_offset;
                        }
                }
        }
        return 0;
}

int fdt_del_partitions(void *blob, int parent_offset)
{
        const void *prop;
        int ndepth = 0;
        int off;
        int ret;

        off = fdt_next_node(blob, parent_offset, &ndepth);
        if (off > 0 && ndepth == 1) {
                prop = fdt_getprop(blob, off, "label", NULL);
                if (prop == NULL) {
                        /*
                         * Could not find label property, nand {}; node?
                         * Check subnode, delete partitions there if any.
                         */
                        return fdt_del_partitions(blob, off);
                } else {
                        ret = fdt_del_subnodes(blob, parent_offset);
                        if (ret < 0) {
                                printf("Can't remove subnodes: %s\n",
                                        fdt_strerror(ret));
                                return ret;
                        }
                }
        }
        return 0;
}

int fdt_node_set_part_info(void *blob, int parent_offset,
                           struct mtd_device *dev)
{
        struct list_head *pentry;
        struct part_info *part;
        struct reg_cell cell;
        int off, ndepth = 0;
        int part_num, ret;
        char buf[64];

        ret = fdt_del_partitions(blob, parent_offset);
        if (ret < 0)
                return ret;

        /*
         * Check if it is nand {}; subnode, adjust
         * the offset in this case
         */
        off = fdt_next_node(blob, parent_offset, &ndepth);
        if (off > 0 && ndepth == 1)
                parent_offset = off;

        part_num = 0;
        list_for_each_prev(pentry, &dev->parts) {
                int newoff;

                part = list_entry(pentry, struct part_info, link);

                debug("%2d: %-20s0x%08x\t0x%08x\t%d\n",
                        part_num, part->name, part->size,
                        part->offset, part->mask_flags);

                sprintf(buf, "partition@%x", part->offset);
add_sub:
                ret = fdt_add_subnode(blob, parent_offset, buf);
                if (ret == -FDT_ERR_NOSPACE) {
                        ret = fdt_increase_size(blob, 512);
                        if (!ret)
                                goto add_sub;
                        else
                                goto err_size;
                } else if (ret < 0) {
                        printf("Can't add partition node: %s\n",
                                fdt_strerror(ret));
                        return ret;
                }
                newoff = ret;

                /* Check MTD_WRITEABLE_CMD flag */
                if (part->mask_flags & 1) {
add_ro:
                        ret = fdt_setprop(blob, newoff, "read_only", NULL, 0);
                        if (ret == -FDT_ERR_NOSPACE) {
                                ret = fdt_increase_size(blob, 512);
                                if (!ret)
                                        goto add_ro;
                                else
                                        goto err_size;
                        } else if (ret < 0)
                                goto err_prop;
                }

                cell.r0 = cpu_to_fdt32(part->offset);
                cell.r1 = cpu_to_fdt32(part->size);
add_reg:
                ret = fdt_setprop(blob, newoff, "reg", &cell, sizeof(cell));
                if (ret == -FDT_ERR_NOSPACE) {
                        ret = fdt_increase_size(blob, 512);
                        if (!ret)
                                goto add_reg;
                        else
                                goto err_size;
                } else if (ret < 0)
                        goto err_prop;

add_label:
                ret = fdt_setprop_string(blob, newoff, "label", part->name);
                if (ret == -FDT_ERR_NOSPACE) {
                        ret = fdt_increase_size(blob, 512);
                        if (!ret)
                                goto add_label;
                        else
                                goto err_size;
                } else if (ret < 0)
                        goto err_prop;

                part_num++;
        }
        return 0;
err_size:
        printf("Can't increase blob size: %s\n", fdt_strerror(ret));
        return ret;
err_prop:
        printf("Can't add property: %s\n", fdt_strerror(ret));
        return ret;
}

/*
 * Update partitions in nor/nand nodes using info from
 * mtdparts environment variable. The nodes to update are
 * specified by node_info structure which contains mtd device
 * type and compatible string: E. g. the board code in
 * ft_board_setup() could use:
 *
 *      struct node_info nodes[] = {
 *              { "fsl,mpc5121-nfc",    MTD_DEV_TYPE_NAND, },
 *              { "cfi-flash",          MTD_DEV_TYPE_NOR,  },
 *      };
 *
 *      fdt_fixup_mtdparts(blob, nodes, ARRAY_SIZE(nodes));
 */
void fdt_fixup_mtdparts(void *blob, void *node_info, int node_info_size)
{
        struct node_info *ni = node_info;
        struct mtd_device *dev;
        char *parts;
        int i, idx;
        int noff;

        parts = getenv("mtdparts");
        if (!parts)
                return;

        if (mtdparts_init() != 0)
                return;

        for (i = 0; i < node_info_size; i++) {
                idx = 0;
                noff = fdt_node_offset_by_compatible(blob, -1, ni[i].compat);
                while (noff != -FDT_ERR_NOTFOUND) {
                        debug("%s: %s, mtd dev type %d\n",
                                fdt_get_name(blob, noff, 0),
                                ni[i].compat, ni[i].type);
                        dev = device_find(ni[i].type, idx++);
                        if (dev) {
                                if (fdt_node_set_part_info(blob, noff, dev))
                                        return; /* return on error */
                        }

                        /* Jump to next flash node */
                        noff = fdt_node_offset_by_compatible(blob, noff,
                                                             ni[i].compat);
                }
        }
}
#endif

void fdt_del_node_and_alias(void *blob, const char *alias)
{
        int off = fdt_path_offset(blob, alias);

        if (off < 0)
                return;

        fdt_del_node(blob, off);

        off = fdt_path_offset(blob, "/aliases");
        fdt_delprop(blob, off, alias);
}

/* Helper to read a big number; size is in cells (not bytes) */
static inline u64 of_read_number(const fdt32_t *cell, int size)
{
        u64 r = 0;
        while (size--)
                r = (r << 32) | fdt32_to_cpu(*(cell++));
        return r;
}

#define PRu64   "%llx"

/* Max address size we deal with */
#define OF_MAX_ADDR_CELLS       4
#define OF_BAD_ADDR     ((u64)-1)
#define OF_CHECK_COUNTS(na, ns) ((na) > 0 && (na) <= OF_MAX_ADDR_CELLS && \
                        (ns) > 0)

/* Debug utility */
#ifdef DEBUG
static void of_dump_addr(const char *s, const fdt32_t *addr, int na)
{
        printf("%s", s);
        while(na--)
                printf(" %08x", *(addr++));
        printf("\n");
}
#else
static void of_dump_addr(const char *s, const fdt32_t *addr, int na) { }
#endif

/* Callbacks for bus specific translators */
struct of_bus {
        const char      *name;
        const char      *addresses;
        void            (*count_cells)(void *blob, int parentoffset,
                                int *addrc, int *sizec);
        u64             (*map)(fdt32_t *addr, const fdt32_t *range,
                                int na, int ns, int pna);
        int             (*translate)(fdt32_t *addr, u64 offset, int na);
};

/* Default translator (generic bus) */
static void of_bus_default_count_cells(void *blob, int parentoffset,
                                        int *addrc, int *sizec)
{
        const fdt32_t *prop;

        if (addrc) {
                prop = fdt_getprop(blob, parentoffset, "#address-cells", NULL);
                if (prop)
                        *addrc = be32_to_cpup(prop);
                else
                        *addrc = 2;
        }

        if (sizec) {
                prop = fdt_getprop(blob, parentoffset, "#size-cells", NULL);
                if (prop)
                        *sizec = be32_to_cpup(prop);
                else
                        *sizec = 1;
        }
}

static u64 of_bus_default_map(fdt32_t *addr, const fdt32_t *range,
                int na, int ns, int pna)
{
        u64 cp, s, da;

        cp = of_read_number(range, na);
        s  = of_read_number(range + na + pna, ns);
        da = of_read_number(addr, na);

        debug("OF: default map, cp="PRu64", s="PRu64", da="PRu64"\n",
            cp, s, da);

        if (da < cp || da >= (cp + s))
                return OF_BAD_ADDR;
        return da - cp;
}

static int of_bus_default_translate(fdt32_t *addr, u64 offset, int na)
{
        u64 a = of_read_number(addr, na);
        memset(addr, 0, na * 4);
        a += offset;
        if (na > 1)
                addr[na - 2] = cpu_to_fdt32(a >> 32);
        addr[na - 1] = cpu_to_fdt32(a & 0xffffffffu);

        return 0;
}

/* Array of bus specific translators */
static struct of_bus of_busses[] = {
        /* Default */
        {
                .name = "default",
                .addresses = "reg",
                .count_cells = of_bus_default_count_cells,
                .map = of_bus_default_map,
                .translate = of_bus_default_translate,
        },
};

static int of_translate_one(void * blob, int parent, struct of_bus *bus,
                            struct of_bus *pbus, fdt32_t *addr,
                            int na, int ns, int pna, const char *rprop)
{
        const fdt32_t *ranges;
        int rlen;
        int rone;
        u64 offset = OF_BAD_ADDR;

        /* Normally, an absence of a "ranges" property means we are
         * crossing a non-translatable boundary, and thus the addresses
         * below the current not cannot be converted to CPU physical ones.
         * Unfortunately, while this is very clear in the spec, it's not
         * what Apple understood, and they do have things like /uni-n or
         * /ht nodes with no "ranges" property and a lot of perfectly
         * useable mapped devices below them. Thus we treat the absence of
         * "ranges" as equivalent to an empty "ranges" property which means
         * a 1:1 translation at that level. It's up to the caller not to try
         * to translate addresses that aren't supposed to be translated in
         * the first place. --BenH.
         */
        ranges = fdt_getprop(blob, parent, rprop, &rlen);
        if (ranges == NULL || rlen == 0) {
                offset = of_read_number(addr, na);
                memset(addr, 0, pna * 4);
                debug("OF: no ranges, 1:1 translation\n");
                goto finish;
        }

        debug("OF: walking ranges...\n");

        /* Now walk through the ranges */
        rlen /= 4;
        rone = na + pna + ns;
        for (; rlen >= rone; rlen -= rone, ranges += rone) {
                offset = bus->map(addr, ranges, na, ns, pna);
                if (offset != OF_BAD_ADDR)
                        break;
        }
        if (offset == OF_BAD_ADDR) {
                debug("OF: not found !\n");
                return 1;
        }
        memcpy(addr, ranges + na, 4 * pna);

 finish:
        of_dump_addr("OF: parent translation for:", addr, pna);
        debug("OF: with offset: "PRu64"\n", offset);

        /* Translate it into parent bus space */
        return pbus->translate(addr, offset, pna);
}

/*
 * Translate an address from the device-tree into a CPU physical address,
 * this walks up the tree and applies the various bus mappings on the
 * way.
 *
 * Note: We consider that crossing any level with #size-cells == 0 to mean
 * that translation is impossible (that is we are not dealing with a value
 * that can be mapped to a cpu physical address). This is not really specified
 * that way, but this is traditionally the way IBM at least do things
 */
static u64 __of_translate_address(void *blob, int node_offset, const fdt32_t *in_addr,
                                  const char *rprop)
{
        int parent;
        struct of_bus *bus, *pbus;
        fdt32_t addr[OF_MAX_ADDR_CELLS];
        int na, ns, pna, pns;
        u64 result = OF_BAD_ADDR;

        debug("OF: ** translation for device %s **\n",
                fdt_get_name(blob, node_offset, NULL));

        /* Get parent & match bus type */
        parent = fdt_parent_offset(blob, node_offset);
        if (parent < 0)
                goto bail;
        bus = &of_busses[0];

        /* Cound address cells & copy address locally */
        bus->count_cells(blob, parent, &na, &ns);
        if (!OF_CHECK_COUNTS(na, ns)) {
                printf("%s: Bad cell count for %s\n", __FUNCTION__,
                       fdt_get_name(blob, node_offset, NULL));
                goto bail;
        }
        memcpy(addr, in_addr, na * 4);

        debug("OF: bus is %s (na=%d, ns=%d) on %s\n",
            bus->name, na, ns, fdt_get_name(blob, parent, NULL));
        of_dump_addr("OF: translating address:", addr, na);

        /* Translate */
        for (;;) {
                /* Switch to parent bus */
                node_offset = parent;
                parent = fdt_parent_offset(blob, node_offset);

                /* If root, we have finished */
                if (parent < 0) {
                        debug("OF: reached root node\n");
                        result = of_read_number(addr, na);
                        break;
                }

                /* Get new parent bus and counts */
                pbus = &of_busses[0];
                pbus->count_cells(blob, parent, &pna, &pns);
                if (!OF_CHECK_COUNTS(pna, pns)) {
                        printf("%s: Bad cell count for %s\n", __FUNCTION__,
                                fdt_get_name(blob, node_offset, NULL));
                        break;
                }

                debug("OF: parent bus is %s (na=%d, ns=%d) on %s\n",
                    pbus->name, pna, pns, fdt_get_name(blob, parent, NULL));

                /* Apply bus translation */
                if (of_translate_one(blob, node_offset, bus, pbus,
                                        addr, na, ns, pna, rprop))
                        break;

                /* Complete the move up one level */
                na = pna;
                ns = pns;
                bus = pbus;

                of_dump_addr("OF: one level translation:", addr, na);
        }
 bail:

        return result;
}

u64 fdt_translate_address(void *blob, int node_offset, const fdt32_t *in_addr)
{
        return __of_translate_address(blob, node_offset, in_addr, "ranges");
}

/**
 * fdt_node_offset_by_compat_reg: Find a node that matches compatiable and
 * who's reg property matches a physical cpu address
 *
 * @blob: ptr to device tree
 * @compat: compatiable string to match
 * @compat_off: property name
 *
 */
int fdt_node_offset_by_compat_reg(void *blob, const char *compat,
                                        phys_addr_t compat_off)
{
        int len, off = fdt_node_offset_by_compatible(blob, -1, compat);
        while (off != -FDT_ERR_NOTFOUND) {
                const fdt32_t *reg = fdt_getprop(blob, off, "reg", &len);
                if (reg) {
                        if (compat_off == fdt_translate_address(blob, off, reg))
                                return off;
                }
                off = fdt_node_offset_by_compatible(blob, off, compat);
        }

        return -FDT_ERR_NOTFOUND;
}

/**
 * fdt_alloc_phandle: Return next free phandle value
 *
 * @blob: ptr to device tree
 */
int fdt_alloc_phandle(void *blob)
{
        int offset, phandle = 0;

        for (offset = fdt_next_node(blob, -1, NULL); offset >= 0;
             offset = fdt_next_node(blob, offset, NULL)) {
                phandle = max(phandle, fdt_get_phandle(blob, offset));
        }

        return phandle + 1;
}

/*
 * fdt_set_phandle: Create a phandle property for the given node
 *
 * @fdt: ptr to device tree
 * @nodeoffset: node to update
 * @phandle: phandle value to set (must be unique)
 */
int fdt_set_phandle(void *fdt, int nodeoffset, uint32_t phandle)
{
        int ret;

#ifdef DEBUG
        int off = fdt_node_offset_by_phandle(fdt, phandle);

        if ((off >= 0) && (off != nodeoffset)) {
                char buf[64];

                fdt_get_path(fdt, nodeoffset, buf, sizeof(buf));
                printf("Trying to update node %s with phandle %u ",
                       buf, phandle);

                fdt_get_path(fdt, off, buf, sizeof(buf));
                printf("that already exists in node %s.\n", buf);
                return -FDT_ERR_BADPHANDLE;
        }
#endif

        ret = fdt_setprop_cell(fdt, nodeoffset, "phandle", phandle);
        if (ret < 0)
                return ret;

        /*
         * For now, also set the deprecated "linux,phandle" property, so that we
         * don't break older kernels.
         */
        ret = fdt_setprop_cell(fdt, nodeoffset, "linux,phandle", phandle);

        return ret;
}

/*
 * fdt_create_phandle: Create a phandle property for the given node
 *
 * @fdt: ptr to device tree
 * @nodeoffset: node to update
 */
unsigned int fdt_create_phandle(void *fdt, int nodeoffset)
{
        /* see if there is a phandle already */
        int phandle = fdt_get_phandle(fdt, nodeoffset);

        /* if we got 0, means no phandle so create one */
        if (phandle == 0) {
                int ret;

                phandle = fdt_alloc_phandle(fdt);
                ret = fdt_set_phandle(fdt, nodeoffset, phandle);
                if (ret < 0) {
                        printf("Can't set phandle %u: %s\n", phandle,
                               fdt_strerror(ret));
                        return 0;
                }
        }

        return phandle;
}

/*
 * fdt_set_node_status: Set status for the given node
 *
 * @fdt: ptr to device tree
 * @nodeoffset: node to update
 * @status: FDT_STATUS_OKAY, FDT_STATUS_DISABLED,
 *          FDT_STATUS_FAIL, FDT_STATUS_FAIL_ERROR_CODE
 * @error_code: optional, only used if status is FDT_STATUS_FAIL_ERROR_CODE
 */
int fdt_set_node_status(void *fdt, int nodeoffset,
                        enum fdt_status status, unsigned int error_code)
{
        char buf[16];
        int ret = 0;

        if (nodeoffset < 0)
                return nodeoffset;

        switch (status) {
        case FDT_STATUS_OKAY:
                ret = fdt_setprop_string(fdt, nodeoffset, "status", "okay");
                break;
        case FDT_STATUS_DISABLED:
                ret = fdt_setprop_string(fdt, nodeoffset, "status", "disabled");
                break;
        case FDT_STATUS_FAIL:
                ret = fdt_setprop_string(fdt, nodeoffset, "status", "fail");
                break;
        case FDT_STATUS_FAIL_ERROR_CODE:
                sprintf(buf, "fail-%d", error_code);
                ret = fdt_setprop_string(fdt, nodeoffset, "status", buf);
                break;
        default:
                printf("Invalid fdt status: %x\n", status);
                ret = -1;
                break;
        }

        return ret;
}

/*
 * fdt_set_status_by_alias: Set status for the given node given an alias
 *
 * @fdt: ptr to device tree
 * @alias: alias of node to update
 * @status: FDT_STATUS_OKAY, FDT_STATUS_DISABLED,
 *          FDT_STATUS_FAIL, FDT_STATUS_FAIL_ERROR_CODE
 * @error_code: optional, only used if status is FDT_STATUS_FAIL_ERROR_CODE
 */
int fdt_set_status_by_alias(void *fdt, const char* alias,
                            enum fdt_status status, unsigned int error_code)
{
        int offset = fdt_path_offset(fdt, alias);

        return fdt_set_node_status(fdt, offset, status, error_code);
}

#if defined(CONFIG_VIDEO) || defined(CONFIG_LCD)
int fdt_add_edid(void *blob, const char *compat, unsigned char *edid_buf)
{
        int noff;
        int ret;

        noff = fdt_node_offset_by_compatible(blob, -1, compat);
        if (noff != -FDT_ERR_NOTFOUND) {
                debug("%s: %s\n", fdt_get_name(blob, noff, 0), compat);
add_edid:
                ret = fdt_setprop(blob, noff, "edid", edid_buf, 128);
                if (ret == -FDT_ERR_NOSPACE) {
                        ret = fdt_increase_size(blob, 512);
                        if (!ret)
                                goto add_edid;
                        else
                                goto err_size;
                } else if (ret < 0) {
                        printf("Can't add property: %s\n", fdt_strerror(ret));
                        return ret;
                }
        }
        return 0;
err_size:
        printf("Can't increase blob size: %s\n", fdt_strerror(ret));
        return ret;
}
#endif

/*
 * Verify the physical address of device tree node for a given alias
 *
 * This function locates the device tree node of a given alias, and then
 * verifies that the physical address of that device matches the given
 * parameter.  It displays a message if there is a mismatch.
 *
 * Returns 1 on success, 0 on failure
 */
int fdt_verify_alias_address(void *fdt, int anode, const char *alias, u64 addr)
{
        const char *path;
        const fdt32_t *reg;
        int node, len;
        u64 dt_addr;

        path = fdt_getprop(fdt, anode, alias, NULL);
        if (!path) {
                /* If there's no such alias, then it's not a failure */
                return 1;
        }

        node = fdt_path_offset(fdt, path);
        if (node < 0) {
                printf("Warning: device tree alias '%s' points to invalid "
                       "node %s.\n", alias, path);
                return 0;
        }

        reg = fdt_getprop(fdt, node, "reg", &len);
        if (!reg) {
                printf("Warning: device tree node '%s' has no address.\n",
                       path);
                return 0;
        }

        dt_addr = fdt_translate_address(fdt, node, reg);
        if (addr != dt_addr) {
                printf("Warning: U-Boot configured device %s at address %llx,\n"
                       " but the device tree has it address %llx.\n",
                       alias, addr, dt_addr);
                return 0;
        }

        return 1;
}

/*
 * Returns the base address of an SOC or PCI node
 */
u64 fdt_get_base_address(void *fdt, int node)
{
        int size;
        u32 naddr;
        const fdt32_t *prop;

        prop = fdt_getprop(fdt, node, "#address-cells", &size);
        if (prop && size == 4)
                naddr = be32_to_cpup(prop);
        else
                naddr = 2;

        prop = fdt_getprop(fdt, node, "ranges", &size);

        return prop ? fdt_translate_address(fdt, node, prop + naddr) : 0;
}