[people/ms/u-boot.git] / lib / fdtdec.c

/*
 * Copyright (c) 2011 The Chromium OS Authors.
 * SPDX-License-Identifier:     GPL-2.0+
 */

#ifndef USE_HOSTCC
#include <common.h>
#include <errno.h>
#include <serial.h>
#include <libfdt.h>
#include <fdtdec.h>
#include <asm/sections.h>
#include <linux/ctype.h>

DECLARE_GLOBAL_DATA_PTR;

/*
 * Here are the type we know about. One day we might allow drivers to
 * register. For now we just put them here. The COMPAT macro allows us to
 * turn this into a sparse list later, and keeps the ID with the name.
 */
#define COMPAT(id, name) name
static const char * const compat_names[COMPAT_COUNT] = {
        COMPAT(UNKNOWN, "<none>"),
        COMPAT(NVIDIA_TEGRA20_EMC, "nvidia,tegra20-emc"),
        COMPAT(NVIDIA_TEGRA20_EMC_TABLE, "nvidia,tegra20-emc-table"),
        COMPAT(NVIDIA_TEGRA20_KBC, "nvidia,tegra20-kbc"),
        COMPAT(NVIDIA_TEGRA20_NAND, "nvidia,tegra20-nand"),
        COMPAT(NVIDIA_TEGRA20_PWM, "nvidia,tegra20-pwm"),
        COMPAT(NVIDIA_TEGRA124_DC, "nvidia,tegra124-dc"),
        COMPAT(NVIDIA_TEGRA124_SOR, "nvidia,tegra124-sor"),
        COMPAT(NVIDIA_TEGRA124_PMC, "nvidia,tegra124-pmc"),
        COMPAT(NVIDIA_TEGRA20_DC, "nvidia,tegra20-dc"),
        COMPAT(NVIDIA_TEGRA210_SDMMC, "nvidia,tegra210-sdhci"),
        COMPAT(NVIDIA_TEGRA124_SDMMC, "nvidia,tegra124-sdhci"),
        COMPAT(NVIDIA_TEGRA30_SDMMC, "nvidia,tegra30-sdhci"),
        COMPAT(NVIDIA_TEGRA20_SDMMC, "nvidia,tegra20-sdhci"),
        COMPAT(NVIDIA_TEGRA124_PCIE, "nvidia,tegra124-pcie"),
        COMPAT(NVIDIA_TEGRA30_PCIE, "nvidia,tegra30-pcie"),
        COMPAT(NVIDIA_TEGRA20_PCIE, "nvidia,tegra20-pcie"),
        COMPAT(NVIDIA_TEGRA124_XUSB_PADCTL, "nvidia,tegra124-xusb-padctl"),
        COMPAT(NVIDIA_TEGRA210_XUSB_PADCTL, "nvidia,tegra210-xusb-padctl"),
        COMPAT(SMSC_LAN9215, "smsc,lan9215"),
        COMPAT(SAMSUNG_EXYNOS5_SROMC, "samsung,exynos-sromc"),
        COMPAT(SAMSUNG_S3C2440_I2C, "samsung,s3c2440-i2c"),
        COMPAT(SAMSUNG_EXYNOS5_SOUND, "samsung,exynos-sound"),
        COMPAT(WOLFSON_WM8994_CODEC, "wolfson,wm8994-codec"),
        COMPAT(GOOGLE_CROS_EC_KEYB, "google,cros-ec-keyb"),
        COMPAT(SAMSUNG_EXYNOS_USB_PHY, "samsung,exynos-usb-phy"),
        COMPAT(SAMSUNG_EXYNOS5_USB3_PHY, "samsung,exynos5250-usb3-phy"),
        COMPAT(SAMSUNG_EXYNOS_TMU, "samsung,exynos-tmu"),
        COMPAT(SAMSUNG_EXYNOS_FIMD, "samsung,exynos-fimd"),
        COMPAT(SAMSUNG_EXYNOS_MIPI_DSI, "samsung,exynos-mipi-dsi"),
        COMPAT(SAMSUNG_EXYNOS5_DP, "samsung,exynos5-dp"),
        COMPAT(SAMSUNG_EXYNOS_DWMMC, "samsung,exynos-dwmmc"),
        COMPAT(SAMSUNG_EXYNOS_MMC, "samsung,exynos-mmc"),
        COMPAT(SAMSUNG_EXYNOS_SERIAL, "samsung,exynos4210-uart"),
        COMPAT(MAXIM_MAX77686_PMIC, "maxim,max77686"),
        COMPAT(GENERIC_SPI_FLASH, "spi-flash"),
        COMPAT(MAXIM_98095_CODEC, "maxim,max98095-codec"),
        COMPAT(INFINEON_SLB9635_TPM, "infineon,slb9635-tpm"),
        COMPAT(INFINEON_SLB9645_TPM, "infineon,slb9645tt"),
        COMPAT(SAMSUNG_EXYNOS5_I2C, "samsung,exynos5-hsi2c"),
        COMPAT(SANDBOX_LCD_SDL, "sandbox,lcd-sdl"),
        COMPAT(TI_TPS65090, "ti,tps65090"),
        COMPAT(COMPAT_NXP_PTN3460, "nxp,ptn3460"),
        COMPAT(SAMSUNG_EXYNOS_SYSMMU, "samsung,sysmmu-v3.3"),
        COMPAT(PARADE_PS8625, "parade,ps8625"),
        COMPAT(INTEL_MICROCODE, "intel,microcode"),
        COMPAT(MEMORY_SPD, "memory-spd"),
        COMPAT(INTEL_PANTHERPOINT_AHCI, "intel,pantherpoint-ahci"),
        COMPAT(INTEL_MODEL_206AX, "intel,model-206ax"),
        COMPAT(INTEL_GMA, "intel,gma"),
        COMPAT(AMS_AS3722, "ams,as3722"),
        COMPAT(INTEL_ICH_SPI, "intel,ich-spi"),
        COMPAT(INTEL_QRK_MRC, "intel,quark-mrc"),
        COMPAT(INTEL_X86_PINCTRL, "intel,x86-pinctrl"),
        COMPAT(SOCIONEXT_XHCI, "socionext,uniphier-xhci"),
        COMPAT(COMPAT_INTEL_PCH, "intel,bd82x6x"),
        COMPAT(COMPAT_INTEL_IRQ_ROUTER, "intel,irq-router"),
};

const char *fdtdec_get_compatible(enum fdt_compat_id id)
{
        /* We allow reading of the 'unknown' ID for testing purposes */
        assert(id >= 0 && id < COMPAT_COUNT);
        return compat_names[id];
}

fdt_addr_t fdtdec_get_addr_size(const void *blob, int node,
                const char *prop_name, fdt_size_t *sizep)
{
        const fdt32_t *ptr, *end;
        int parent, na, ns, len;
        fdt_addr_t addr;

        debug("%s: %s: ", __func__, prop_name);

        parent = fdt_parent_offset(blob, node);
        if (parent < 0) {
                debug("(no parent found)\n");
                return FDT_ADDR_T_NONE;
        }

        na = fdt_address_cells(blob, parent);
        ns = fdt_size_cells(blob, parent);

        ptr = fdt_getprop(blob, node, prop_name, &len);
        if (!ptr) {
                debug("(not found)\n");
                return FDT_ADDR_T_NONE;
        }

        end = ptr + len / sizeof(*ptr);

        if (ptr + na + ns > end) {
                debug("(not enough data: expected %d bytes, got %d bytes)\n",
                      (na + ns) * 4, len);
                return FDT_ADDR_T_NONE;
        }

        addr = fdtdec_get_number(ptr, na);

        if (sizep) {
                *sizep = fdtdec_get_number(ptr + na, ns);
                debug("addr=%pa, size=%pa\n", &addr, sizep);
        } else {
                debug("%pa\n", &addr);
        }

        return addr;
}

fdt_addr_t fdtdec_get_addr(const void *blob, int node,
                const char *prop_name)
{
        return fdtdec_get_addr_size(blob, node, prop_name, NULL);
}

#ifdef CONFIG_PCI
int fdtdec_get_pci_addr(const void *blob, int node, enum fdt_pci_space type,
                const char *prop_name, struct fdt_pci_addr *addr)
{
        const u32 *cell;
        int len;
        int ret = -ENOENT;

        debug("%s: %s: ", __func__, prop_name);

        /*
         * If we follow the pci bus bindings strictly, we should check
         * the value of the node's parent node's #address-cells and
         * #size-cells. They need to be 3 and 2 accordingly. However,
         * for simplicity we skip the check here.
         */
        cell = fdt_getprop(blob, node, prop_name, &len);
        if (!cell)
                goto fail;

        if ((len % FDT_PCI_REG_SIZE) == 0) {
                int num = len / FDT_PCI_REG_SIZE;
                int i;

                for (i = 0; i < num; i++) {
                        debug("pci address #%d: %08lx %08lx %08lx\n", i,
                              (ulong)fdt_addr_to_cpu(cell[0]),
                              (ulong)fdt_addr_to_cpu(cell[1]),
                              (ulong)fdt_addr_to_cpu(cell[2]));
                        if ((fdt_addr_to_cpu(*cell) & type) == type) {
                                addr->phys_hi = fdt_addr_to_cpu(cell[0]);
                                addr->phys_mid = fdt_addr_to_cpu(cell[1]);
                                addr->phys_lo = fdt_addr_to_cpu(cell[2]);
                                break;
                        } else {
                                cell += (FDT_PCI_ADDR_CELLS +
                                         FDT_PCI_SIZE_CELLS);
                        }
                }

                if (i == num) {
                        ret = -ENXIO;
                        goto fail;
                }

                return 0;
        } else {
                ret = -EINVAL;
        }

fail:
        debug("(not found)\n");
        return ret;
}

int fdtdec_get_pci_vendev(const void *blob, int node, u16 *vendor, u16 *device)
{
        const char *list, *end;
        int len;

        list = fdt_getprop(blob, node, "compatible", &len);
        if (!list)
                return -ENOENT;

        end = list + len;
        while (list < end) {
                char *s;

                len = strlen(list);
                if (len >= strlen("pciVVVV,DDDD")) {
                        s = strstr(list, "pci");

                        /*
                         * check if the string is something like pciVVVV,DDDD.RR
                         * or just pciVVVV,DDDD
                         */
                        if (s && s[7] == ',' &&
                            (s[12] == '.' || s[12] == 0)) {
                                s += 3;
                                *vendor = simple_strtol(s, NULL, 16);

                                s += 5;
                                *device = simple_strtol(s, NULL, 16);

                                return 0;
                        }
                } else {
                        list += (len + 1);
                }
        }

        return -ENOENT;
}

int fdtdec_get_pci_bdf(const void *blob, int node,
                struct fdt_pci_addr *addr, pci_dev_t *bdf)
{
        u16 dt_vendor, dt_device, vendor, device;
        int ret;

        /* get vendor id & device id from the compatible string */
        ret = fdtdec_get_pci_vendev(blob, node, &dt_vendor, &dt_device);
        if (ret)
                return ret;

        /* extract the bdf from fdt_pci_addr */
        *bdf = addr->phys_hi & 0xffff00;

        /* read vendor id & device id based on bdf */
        pci_read_config_word(*bdf, PCI_VENDOR_ID, &vendor);
        pci_read_config_word(*bdf, PCI_DEVICE_ID, &device);

        /*
         * Note there are two places in the device tree to fully describe
         * a pci device: one is via compatible string with a format of
         * "pciVVVV,DDDD" and the other one is the bdf numbers encoded in
         * the device node's reg address property. We read the vendor id
         * and device id based on bdf and compare the values with the
         * "VVVV,DDDD". If they are the same, then we are good to use bdf
         * to read device's bar. But if they are different, we have to rely
         * on the vendor id and device id extracted from the compatible
         * string and locate the real bdf by pci_find_device(). This is
         * because normally we may only know device's device number and
         * function number when writing device tree. The bus number is
         * dynamically assigned during the pci enumeration process.
         */
        if ((dt_vendor != vendor) || (dt_device != device)) {
                *bdf = pci_find_device(dt_vendor, dt_device, 0);
                if (*bdf == -1)
                        return -ENODEV;
        }

        return 0;
}

int fdtdec_get_pci_bar32(const void *blob, int node,
                struct fdt_pci_addr *addr, u32 *bar)
{
        pci_dev_t bdf;
        int barnum;
        int ret;

        /* get pci devices's bdf */
        ret = fdtdec_get_pci_bdf(blob, node, addr, &bdf);
        if (ret)
                return ret;

        /* extract the bar number from fdt_pci_addr */
        barnum = addr->phys_hi & 0xff;
        if ((barnum < PCI_BASE_ADDRESS_0) || (barnum > PCI_CARDBUS_CIS))
                return -EINVAL;

        barnum = (barnum - PCI_BASE_ADDRESS_0) / 4;
        *bar = pci_read_bar32(pci_bus_to_hose(PCI_BUS(bdf)), bdf, barnum);

        return 0;
}
#endif

uint64_t fdtdec_get_uint64(const void *blob, int node, const char *prop_name,
                uint64_t default_val)
{
        const uint64_t *cell64;
        int length;

        cell64 = fdt_getprop(blob, node, prop_name, &length);
        if (!cell64 || length < sizeof(*cell64))
                return default_val;

        return fdt64_to_cpu(*cell64);
}

int fdtdec_get_is_enabled(const void *blob, int node)
{
        const char *cell;

        /*
         * It should say "okay", so only allow that. Some fdts use "ok" but
         * this is a bug. Please fix your device tree source file. See here
         * for discussion:
         *
         * http://www.mail-archive.com/u-boot@lists.denx.de/msg71598.html
         */
        cell = fdt_getprop(blob, node, "status", NULL);
        if (cell)
                return 0 == strcmp(cell, "okay");
        return 1;
}

enum fdt_compat_id fdtdec_lookup(const void *blob, int node)
{
        enum fdt_compat_id id;

        /* Search our drivers */
        for (id = COMPAT_UNKNOWN; id < COMPAT_COUNT; id++)
                if (0 == fdt_node_check_compatible(blob, node,
                                compat_names[id]))
                        return id;
        return COMPAT_UNKNOWN;
}

int fdtdec_next_compatible(const void *blob, int node,
                enum fdt_compat_id id)
{
        return fdt_node_offset_by_compatible(blob, node, compat_names[id]);
}

int fdtdec_next_compatible_subnode(const void *blob, int node,
                enum fdt_compat_id id, int *depthp)
{
        do {
                node = fdt_next_node(blob, node, depthp);
        } while (*depthp > 1);

        /* If this is a direct subnode, and compatible, return it */
        if (*depthp == 1 && 0 == fdt_node_check_compatible(
                                                blob, node, compat_names[id]))
                return node;

        return -FDT_ERR_NOTFOUND;
}

int fdtdec_next_alias(const void *blob, const char *name,
                enum fdt_compat_id id, int *upto)
{
#define MAX_STR_LEN 20
        char str[MAX_STR_LEN + 20];
        int node, err;

        /* snprintf() is not available */
        assert(strlen(name) < MAX_STR_LEN);
        sprintf(str, "%.*s%d", MAX_STR_LEN, name, *upto);
        node = fdt_path_offset(blob, str);
        if (node < 0)
                return node;
        err = fdt_node_check_compatible(blob, node, compat_names[id]);
        if (err < 0)
                return err;
        if (err)
                return -FDT_ERR_NOTFOUND;
        (*upto)++;
        return node;
}

int fdtdec_find_aliases_for_id(const void *blob, const char *name,
                        enum fdt_compat_id id, int *node_list, int maxcount)
{
        memset(node_list, '\0', sizeof(*node_list) * maxcount);

        return fdtdec_add_aliases_for_id(blob, name, id, node_list, maxcount);
}

/* TODO: Can we tighten this code up a little? */
int fdtdec_add_aliases_for_id(const void *blob, const char *name,
                        enum fdt_compat_id id, int *node_list, int maxcount)
{
        int name_len = strlen(name);
        int nodes[maxcount];
        int num_found = 0;
        int offset, node;
        int alias_node;
        int count;
        int i, j;

        /* find the alias node if present */
        alias_node = fdt_path_offset(blob, "/aliases");

        /*
         * start with nothing, and we can assume that the root node can't
         * match
         */
        memset(nodes, '\0', sizeof(nodes));

        /* First find all the compatible nodes */
        for (node = count = 0; node >= 0 && count < maxcount;) {
                node = fdtdec_next_compatible(blob, node, id);
                if (node >= 0)
                        nodes[count++] = node;
        }
        if (node >= 0)
                debug("%s: warning: maxcount exceeded with alias '%s'\n",
                       __func__, name);

        /* Now find all the aliases */
        for (offset = fdt_first_property_offset(blob, alias_node);
                        offset > 0;
                        offset = fdt_next_property_offset(blob, offset)) {
                const struct fdt_property *prop;
                const char *path;
                int number;
                int found;

                node = 0;
                prop = fdt_get_property_by_offset(blob, offset, NULL);
                path = fdt_string(blob, fdt32_to_cpu(prop->nameoff));
                if (prop->len && 0 == strncmp(path, name, name_len))
                        node = fdt_path_offset(blob, prop->data);
                if (node <= 0)
                        continue;

                /* Get the alias number */
                number = simple_strtoul(path + name_len, NULL, 10);
                if (number < 0 || number >= maxcount) {
                        debug("%s: warning: alias '%s' is out of range\n",
                               __func__, path);
                        continue;
                }

                /* Make sure the node we found is actually in our list! */
                found = -1;
                for (j = 0; j < count; j++)
                        if (nodes[j] == node) {
                                found = j;
                                break;
                        }

                if (found == -1) {
                        debug("%s: warning: alias '%s' points to a node "
                                "'%s' that is missing or is not compatible "
                                " with '%s'\n", __func__, path,
                                fdt_get_name(blob, node, NULL),
                               compat_names[id]);
                        continue;
                }

                /*
                 * Add this node to our list in the right place, and mark
                 * it as done.
                 */
                if (fdtdec_get_is_enabled(blob, node)) {
                        if (node_list[number]) {
                                debug("%s: warning: alias '%s' requires that "
                                      "a node be placed in the list in a "
                                      "position which is already filled by "
                                      "node '%s'\n", __func__, path,
                                      fdt_get_name(blob, node, NULL));
                                continue;
                        }
                        node_list[number] = node;
                        if (number >= num_found)
                                num_found = number + 1;
                }
                nodes[found] = 0;
        }

        /* Add any nodes not mentioned by an alias */
        for (i = j = 0; i < maxcount; i++) {
                if (!node_list[i]) {
                        for (; j < maxcount; j++)
                                if (nodes[j] &&
                                        fdtdec_get_is_enabled(blob, nodes[j]))
                                        break;

                        /* Have we run out of nodes to add? */
                        if (j == maxcount)
                                break;

                        assert(!node_list[i]);
                        node_list[i] = nodes[j++];
                        if (i >= num_found)
                                num_found = i + 1;
                }
        }

        return num_found;
}

int fdtdec_get_alias_seq(const void *blob, const char *base, int offset,
                         int *seqp)
{
        int base_len = strlen(base);
        const char *find_name;
        int find_namelen;
        int prop_offset;
        int aliases;

        find_name = fdt_get_name(blob, offset, &find_namelen);
        debug("Looking for '%s' at %d, name %s\n", base, offset, find_name);

        aliases = fdt_path_offset(blob, "/aliases");
        for (prop_offset = fdt_first_property_offset(blob, aliases);
             prop_offset > 0;
             prop_offset = fdt_next_property_offset(blob, prop_offset)) {
                const char *prop;
                const char *name;
                const char *slash;
                int len, val;

                prop = fdt_getprop_by_offset(blob, prop_offset, &name, &len);
                debug("   - %s, %s\n", name, prop);
                if (len < find_namelen || *prop != '/' || prop[len - 1] ||
                    strncmp(name, base, base_len))
                        continue;

                slash = strrchr(prop, '/');
                if (strcmp(slash + 1, find_name))
                        continue;
                val = trailing_strtol(name);
                if (val != -1) {
                        *seqp = val;
                        debug("Found seq %d\n", *seqp);
                        return 0;
                }
        }

        debug("Not found\n");
        return -ENOENT;
}

int fdtdec_get_chosen_node(const void *blob, const char *name)
{
        const char *prop;
        int chosen_node;
        int len;

        if (!blob)
                return -FDT_ERR_NOTFOUND;
        chosen_node = fdt_path_offset(blob, "/chosen");
        prop = fdt_getprop(blob, chosen_node, name, &len);
        if (!prop)
                return -FDT_ERR_NOTFOUND;
        return fdt_path_offset(blob, prop);
}

int fdtdec_check_fdt(void)
{
        /*
         * We must have an FDT, but we cannot panic() yet since the console
         * is not ready. So for now, just assert(). Boards which need an early
         * FDT (prior to console ready) will need to make their own
         * arrangements and do their own checks.
         */
        assert(!fdtdec_prepare_fdt());
        return 0;
}

/*
 * This function is a little odd in that it accesses global data. At some
 * point if the architecture board.c files merge this will make more sense.
 * Even now, it is common code.
 */
int fdtdec_prepare_fdt(void)
{
        if (!gd->fdt_blob || ((uintptr_t)gd->fdt_blob & 3) ||
            fdt_check_header(gd->fdt_blob)) {
#ifdef CONFIG_SPL_BUILD
                puts("Missing DTB\n");
#else
                puts("No valid device tree binary found - please append one to U-Boot binary, use u-boot-dtb.bin or define CONFIG_OF_EMBED. For sandbox, use -d <file.dtb>\n");
# ifdef DEBUG
                if (gd->fdt_blob) {
                        printf("fdt_blob=%p\n", gd->fdt_blob);
                        print_buffer((ulong)gd->fdt_blob, gd->fdt_blob, 4,
                                     32, 0);
                }
# endif
#endif
                return -1;
        }
        return 0;
}

int fdtdec_lookup_phandle(const void *blob, int node, const char *prop_name)
{
        const u32 *phandle;
        int lookup;

        debug("%s: %s\n", __func__, prop_name);
        phandle = fdt_getprop(blob, node, prop_name, NULL);
        if (!phandle)
                return -FDT_ERR_NOTFOUND;

        lookup = fdt_node_offset_by_phandle(blob, fdt32_to_cpu(*phandle));
        return lookup;
}

/**
 * Look up a property in a node and check that it has a minimum length.
 *
 * @param blob          FDT blob
 * @param node          node to examine
 * @param prop_name     name of property to find
 * @param min_len       minimum property length in bytes
 * @param err           0 if ok, or -FDT_ERR_NOTFOUND if the property is not
                        found, or -FDT_ERR_BADLAYOUT if not enough data
 * @return pointer to cell, which is only valid if err == 0
 */
static const void *get_prop_check_min_len(const void *blob, int node,
                const char *prop_name, int min_len, int *err)
{
        const void *cell;
        int len;

        debug("%s: %s\n", __func__, prop_name);
        cell = fdt_getprop(blob, node, prop_name, &len);
        if (!cell)
                *err = -FDT_ERR_NOTFOUND;
        else if (len < min_len)
                *err = -FDT_ERR_BADLAYOUT;
        else
                *err = 0;
        return cell;
}

int fdtdec_get_int_array(const void *blob, int node, const char *prop_name,
                u32 *array, int count)
{
        const u32 *cell;
        int i, err = 0;

        debug("%s: %s\n", __func__, prop_name);
        cell = get_prop_check_min_len(blob, node, prop_name,
                                      sizeof(u32) * count, &err);
        if (!err) {
                for (i = 0; i < count; i++)
                        array[i] = fdt32_to_cpu(cell[i]);
        }
        return err;
}

int fdtdec_get_int_array_count(const void *blob, int node,
                               const char *prop_name, u32 *array, int count)
{
        const u32 *cell;
        int len, elems;
        int i;

        debug("%s: %s\n", __func__, prop_name);
        cell = fdt_getprop(blob, node, prop_name, &len);
        if (!cell)
                return -FDT_ERR_NOTFOUND;
        elems = len / sizeof(u32);
        if (count > elems)
                count = elems;
        for (i = 0; i < count; i++)
                array[i] = fdt32_to_cpu(cell[i]);

        return count;
}

const u32 *fdtdec_locate_array(const void *blob, int node,
                               const char *prop_name, int count)
{
        const u32 *cell;
        int err;

        cell = get_prop_check_min_len(blob, node, prop_name,
                                      sizeof(u32) * count, &err);
        return err ? NULL : cell;
}

int fdtdec_get_bool(const void *blob, int node, const char *prop_name)
{
        const s32 *cell;
        int len;

        debug("%s: %s\n", __func__, prop_name);
        cell = fdt_getprop(blob, node, prop_name, &len);
        return cell != NULL;
}

int fdtdec_parse_phandle_with_args(const void *blob, int src_node,
                                   const char *list_name,
                                   const char *cells_name,
                                   int cell_count, int index,
                                   struct fdtdec_phandle_args *out_args)
{
        const __be32 *list, *list_end;
        int rc = 0, size, cur_index = 0;
        uint32_t count = 0;
        int node = -1;
        int phandle;

        /* Retrieve the phandle list property */
        list = fdt_getprop(blob, src_node, list_name, &size);
        if (!list)
                return -ENOENT;
        list_end = list + size / sizeof(*list);

        /* Loop over the phandles until all the requested entry is found */
        while (list < list_end) {
                rc = -EINVAL;
                count = 0;

                /*
                 * If phandle is 0, then it is an empty entry with no
                 * arguments.  Skip forward to the next entry.
                 */
                phandle = be32_to_cpup(list++);
                if (phandle) {
                        /*
                         * Find the provider node and parse the #*-cells
                         * property to determine the argument length.
                         *
                         * This is not needed if the cell count is hard-coded
                         * (i.e. cells_name not set, but cell_count is set),
                         * except when we're going to return the found node
                         * below.
                         */
                        if (cells_name || cur_index == index) {
                                node = fdt_node_offset_by_phandle(blob,
                                                                  phandle);
                                if (!node) {
                                        debug("%s: could not find phandle\n",
                                              fdt_get_name(blob, src_node,
                                                           NULL));
                                        goto err;
                                }
                        }

                        if (cells_name) {
                                count = fdtdec_get_int(blob, node, cells_name,
                                                       -1);
                                if (count == -1) {
                                        debug("%s: could not get %s for %s\n",
                                              fdt_get_name(blob, src_node,
                                                           NULL),
                                              cells_name,
                                              fdt_get_name(blob, node,
                                                           NULL));
                                        goto err;
                                }
                        } else {
                                count = cell_count;
                        }

                        /*
                         * Make sure that the arguments actually fit in the
                         * remaining property data length
                         */
                        if (list + count > list_end) {
                                debug("%s: arguments longer than property\n",
                                      fdt_get_name(blob, src_node, NULL));
                                goto err;
                        }
                }

                /*
                 * All of the error cases above bail out of the loop, so at
                 * this point, the parsing is successful. If the requested
                 * index matches, then fill the out_args structure and return,
                 * or return -ENOENT for an empty entry.
                 */
                rc = -ENOENT;
                if (cur_index == index) {
                        if (!phandle)
                                goto err;

                        if (out_args) {
                                int i;

                                if (count > MAX_PHANDLE_ARGS) {
                                        debug("%s: too many arguments %d\n",
                                              fdt_get_name(blob, src_node,
                                                           NULL), count);
                                        count = MAX_PHANDLE_ARGS;
                                }
                                out_args->node = node;
                                out_args->args_count = count;
                                for (i = 0; i < count; i++) {
                                        out_args->args[i] =
                                                        be32_to_cpup(list++);
                                }
                        }

                        /* Found it! return success */
                        return 0;
                }

                node = -1;
                list += count;
                cur_index++;
        }

        /*
         * Result will be one of:
         * -ENOENT : index is for empty phandle
         * -EINVAL : parsing error on data
         * [1..n]  : Number of phandle (count mode; when index = -1)
         */
        rc = index < 0 ? cur_index : -ENOENT;
 err:
        return rc;
}

int fdtdec_get_byte_array(const void *blob, int node, const char *prop_name,
                u8 *array, int count)
{
        const u8 *cell;
        int err;

        cell = get_prop_check_min_len(blob, node, prop_name, count, &err);
        if (!err)
                memcpy(array, cell, count);
        return err;
}

const u8 *fdtdec_locate_byte_array(const void *blob, int node,
                             const char *prop_name, int count)
{
        const u8 *cell;
        int err;

        cell = get_prop_check_min_len(blob, node, prop_name, count, &err);
        if (err)
                return NULL;
        return cell;
}

int fdtdec_get_config_int(const void *blob, const char *prop_name,
                int default_val)
{
        int config_node;

        debug("%s: %s\n", __func__, prop_name);
        config_node = fdt_path_offset(blob, "/config");
        if (config_node < 0)
                return default_val;
        return fdtdec_get_int(blob, config_node, prop_name, default_val);
}

int fdtdec_get_config_bool(const void *blob, const char *prop_name)
{
        int config_node;
        const void *prop;

        debug("%s: %s\n", __func__, prop_name);
        config_node = fdt_path_offset(blob, "/config");
        if (config_node < 0)
                return 0;
        prop = fdt_get_property(blob, config_node, prop_name, NULL);

        return prop != NULL;
}

char *fdtdec_get_config_string(const void *blob, const char *prop_name)
{
        const char *nodep;
        int nodeoffset;
        int len;

        debug("%s: %s\n", __func__, prop_name);
        nodeoffset = fdt_path_offset(blob, "/config");
        if (nodeoffset < 0)
                return NULL;

        nodep = fdt_getprop(blob, nodeoffset, prop_name, &len);
        if (!nodep)
                return NULL;

        return (char *)nodep;
}

int fdtdec_decode_region(const void *blob, int node, const char *prop_name,
                         fdt_addr_t *basep, fdt_size_t *sizep)
{
        const fdt_addr_t *cell;
        int len;

        debug("%s: %s: %s\n", __func__, fdt_get_name(blob, node, NULL),
              prop_name);
        cell = fdt_getprop(blob, node, prop_name, &len);
        if (!cell || (len < sizeof(fdt_addr_t) * 2)) {
                debug("cell=%p, len=%d\n", cell, len);
                return -1;
        }

        *basep = fdt_addr_to_cpu(*cell);
        *sizep = fdt_size_to_cpu(cell[1]);
        debug("%s: base=%08lx, size=%lx\n", __func__, (ulong)*basep,
              (ulong)*sizep);

        return 0;
}

/**
 * Read a flash entry from the fdt
 *
 * @param blob          FDT blob
 * @param node          Offset of node to read
 * @param name          Name of node being read
 * @param entry         Place to put offset and size of this node
 * @return 0 if ok, -ve on error
 */
int fdtdec_read_fmap_entry(const void *blob, int node, const char *name,
                           struct fmap_entry *entry)
{
        const char *prop;
        u32 reg[2];

        if (fdtdec_get_int_array(blob, node, "reg", reg, 2)) {
                debug("Node '%s' has bad/missing 'reg' property\n", name);
                return -FDT_ERR_NOTFOUND;
        }
        entry->offset = reg[0];
        entry->length = reg[1];
        entry->used = fdtdec_get_int(blob, node, "used", entry->length);
        prop = fdt_getprop(blob, node, "compress", NULL);
        entry->compress_algo = prop && !strcmp(prop, "lzo") ?
                FMAP_COMPRESS_LZO : FMAP_COMPRESS_NONE;
        prop = fdt_getprop(blob, node, "hash", &entry->hash_size);
        entry->hash_algo = prop ? FMAP_HASH_SHA256 : FMAP_HASH_NONE;
        entry->hash = (uint8_t *)prop;

        return 0;
}

u64 fdtdec_get_number(const fdt32_t *ptr, unsigned int cells)
{
        u64 number = 0;

        while (cells--)
                number = (number << 32) | fdt32_to_cpu(*ptr++);

        return number;
}

int fdt_get_resource(const void *fdt, int node, const char *property,
                     unsigned int index, struct fdt_resource *res)
{
        const fdt32_t *ptr, *end;
        int na, ns, len, parent;
        unsigned int i = 0;

        parent = fdt_parent_offset(fdt, node);
        if (parent < 0)
                return parent;

        na = fdt_address_cells(fdt, parent);
        ns = fdt_size_cells(fdt, parent);

        ptr = fdt_getprop(fdt, node, property, &len);
        if (!ptr)
                return len;

        end = ptr + len / sizeof(*ptr);

        while (ptr + na + ns <= end) {
                if (i == index) {
                        res->start = res->end = fdtdec_get_number(ptr, na);
                        res->end += fdtdec_get_number(&ptr[na], ns) - 1;
                        return 0;
                }

                ptr += na + ns;
                i++;
        }

        return -FDT_ERR_NOTFOUND;
}

int fdt_get_named_resource(const void *fdt, int node, const char *property,
                           const char *prop_names, const char *name,
                           struct fdt_resource *res)
{
        int index;

        index = fdt_find_string(fdt, node, prop_names, name);
        if (index < 0)
                return index;

        return fdt_get_resource(fdt, node, property, index, res);
}

int fdtdec_decode_memory_region(const void *blob, int config_node,
                                const char *mem_type, const char *suffix,
                                fdt_addr_t *basep, fdt_size_t *sizep)
{
        char prop_name[50];
        const char *mem;
        fdt_size_t size, offset_size;
        fdt_addr_t base, offset;
        int node;

        if (config_node == -1) {
                config_node = fdt_path_offset(blob, "/config");
                if (config_node < 0) {
                        debug("%s: Cannot find /config node\n", __func__);
                        return -ENOENT;
                }
        }
        if (!suffix)
                suffix = "";

        snprintf(prop_name, sizeof(prop_name), "%s-memory%s", mem_type,
                 suffix);
        mem = fdt_getprop(blob, config_node, prop_name, NULL);
        if (!mem) {
                debug("%s: No memory type for '%s', using /memory\n", __func__,
                      prop_name);
                mem = "/memory";
        }

        node = fdt_path_offset(blob, mem);
        if (node < 0) {
                debug("%s: Failed to find node '%s': %s\n", __func__, mem,
                      fdt_strerror(node));
                return -ENOENT;
        }

        /*
         * Not strictly correct - the memory may have multiple banks. We just
         * use the first
         */
        if (fdtdec_decode_region(blob, node, "reg", &base, &size)) {
                debug("%s: Failed to decode memory region %s\n", __func__,
                      mem);
                return -EINVAL;
        }

        snprintf(prop_name, sizeof(prop_name), "%s-offset%s", mem_type,
                 suffix);
        if (fdtdec_decode_region(blob, config_node, prop_name, &offset,
                                 &offset_size)) {
                debug("%s: Failed to decode memory region '%s'\n", __func__,
                      prop_name);
                return -EINVAL;
        }

        *basep = base + offset;
        *sizep = offset_size;

        return 0;
}

static int decode_timing_property(const void *blob, int node, const char *name,
                                  struct timing_entry *result)
{
        int length, ret = 0;
        const u32 *prop;

        prop = fdt_getprop(blob, node, name, &length);
        if (!prop) {
                debug("%s: could not find property %s\n",
                      fdt_get_name(blob, node, NULL), name);
                return length;
        }

        if (length == sizeof(u32)) {
                result->typ = fdtdec_get_int(blob, node, name, 0);
                result->min = result->typ;
                result->max = result->typ;
        } else {
                ret = fdtdec_get_int_array(blob, node, name, &result->min, 3);
        }

        return ret;
}

int fdtdec_decode_display_timing(const void *blob, int parent, int index,
                                 struct display_timing *dt)
{
        int i, node, timings_node;
        u32 val = 0;
        int ret = 0;

        timings_node = fdt_subnode_offset(blob, parent, "display-timings");
        if (timings_node < 0)
                return timings_node;

        for (i = 0, node = fdt_first_subnode(blob, timings_node);
             node > 0 && i != index;
             node = fdt_next_subnode(blob, node))
                i++;

        if (node < 0)
                return node;

        memset(dt, 0, sizeof(*dt));

        ret |= decode_timing_property(blob, node, "hback-porch",
                                      &dt->hback_porch);
        ret |= decode_timing_property(blob, node, "hfront-porch",
                                      &dt->hfront_porch);
        ret |= decode_timing_property(blob, node, "hactive", &dt->hactive);
        ret |= decode_timing_property(blob, node, "hsync-len", &dt->hsync_len);
        ret |= decode_timing_property(blob, node, "vback-porch",
                                      &dt->vback_porch);
        ret |= decode_timing_property(blob, node, "vfront-porch",
                                      &dt->vfront_porch);
        ret |= decode_timing_property(blob, node, "vactive", &dt->vactive);
        ret |= decode_timing_property(blob, node, "vsync-len", &dt->vsync_len);
        ret |= decode_timing_property(blob, node, "clock-frequency",
                                      &dt->pixelclock);

        dt->flags = 0;
        val = fdtdec_get_int(blob, node, "vsync-active", -1);
        if (val != -1) {
                dt->flags |= val ? DISPLAY_FLAGS_VSYNC_HIGH :
                                DISPLAY_FLAGS_VSYNC_LOW;
        }
        val = fdtdec_get_int(blob, node, "hsync-active", -1);
        if (val != -1) {
                dt->flags |= val ? DISPLAY_FLAGS_HSYNC_HIGH :
                                DISPLAY_FLAGS_HSYNC_LOW;
        }
        val = fdtdec_get_int(blob, node, "de-active", -1);
        if (val != -1) {
                dt->flags |= val ? DISPLAY_FLAGS_DE_HIGH :
                                DISPLAY_FLAGS_DE_LOW;
        }
        val = fdtdec_get_int(blob, node, "pixelclk-active", -1);
        if (val != -1) {
                dt->flags |= val ? DISPLAY_FLAGS_PIXDATA_POSEDGE :
                                DISPLAY_FLAGS_PIXDATA_NEGEDGE;
        }

        if (fdtdec_get_bool(blob, node, "interlaced"))
                dt->flags |= DISPLAY_FLAGS_INTERLACED;
        if (fdtdec_get_bool(blob, node, "doublescan"))
                dt->flags |= DISPLAY_FLAGS_DOUBLESCAN;
        if (fdtdec_get_bool(blob, node, "doubleclk"))
                dt->flags |= DISPLAY_FLAGS_DOUBLECLK;

        return 0;
}

int fdtdec_setup(void)
{
#ifdef CONFIG_OF_CONTROL
# ifdef CONFIG_OF_EMBED
        /* Get a pointer to the FDT */
        gd->fdt_blob = __dtb_dt_begin;
# elif defined CONFIG_OF_SEPARATE
#  ifdef CONFIG_SPL_BUILD
        /* FDT is at end of BSS */
        gd->fdt_blob = (ulong *)&__bss_end;
#  else
        /* FDT is at end of image */
        gd->fdt_blob = (ulong *)&_end;
#endif
# elif defined(CONFIG_OF_HOSTFILE)
        if (sandbox_read_fdt_from_file()) {
                puts("Failed to read control FDT\n");
                return -1;
        }
# endif
# ifndef CONFIG_SPL_BUILD
        /* Allow the early environment to override the fdt address */
        gd->fdt_blob = (void *)getenv_ulong("fdtcontroladdr", 16,
                                                (uintptr_t)gd->fdt_blob);
# endif
#endif
        return fdtdec_prepare_fdt();
}

#endif /* !USE_HOSTCC */