power: Add AMS AS3722 PMIC support

[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 <linux/ctype.h>

#include <asm/gpio.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_USB, "nvidia,tegra20-ehci"),
        COMPAT(NVIDIA_TEGRA30_USB, "nvidia,tegra30-ehci"),
        COMPAT(NVIDIA_TEGRA114_USB, "nvidia,tegra114-ehci"),
        COMPAT(NVIDIA_TEGRA114_I2C, "nvidia,tegra114-i2c"),
        COMPAT(NVIDIA_TEGRA20_I2C, "nvidia,tegra20-i2c"),
        COMPAT(NVIDIA_TEGRA20_DVC, "nvidia,tegra20-i2c-dvc"),
        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_TEGRA20_DC, "nvidia,tegra20-dc"),
        COMPAT(NVIDIA_TEGRA124_SDMMC, "nvidia,tegra124-sdhci"),
        COMPAT(NVIDIA_TEGRA30_SDMMC, "nvidia,tegra30-sdhci"),
        COMPAT(NVIDIA_TEGRA20_SDMMC, "nvidia,tegra20-sdhci"),
        COMPAT(NVIDIA_TEGRA20_SFLASH, "nvidia,tegra20-sflash"),
        COMPAT(NVIDIA_TEGRA20_SLINK, "nvidia,tegra20-slink"),
        COMPAT(NVIDIA_TEGRA114_SPI, "nvidia,tegra114-spi"),
        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(SAMSUNG_EXYNOS_SPI, "samsung,exynos-spi"),
        COMPAT(GOOGLE_CROS_EC, "google,cros-ec"),
        COMPAT(GOOGLE_CROS_EC_KEYB, "google,cros-ec-keyb"),
        COMPAT(SAMSUNG_EXYNOS_EHCI, "samsung,exynos-ehci"),
        COMPAT(SAMSUNG_EXYNOS5_XHCI, "samsung,exynos5250-xhci"),
        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_pmic"),
        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,slb9645-tpm"),
        COMPAT(SAMSUNG_EXYNOS5_I2C, "samsung,exynos5-hsi2c"),
        COMPAT(SANDBOX_HOST_EMULATION, "sandbox,host-emulation"),
        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(COMPAT_INTEL_LPC, "intel,lpc"),
        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"),
};

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 fdt_addr_t *cell;
        int len;

        debug("%s: %s: ", __func__, prop_name);
        cell = fdt_getprop(blob, node, prop_name, &len);
        if (cell && ((!sizep && len == sizeof(fdt_addr_t)) ||
                     len == sizeof(fdt_addr_t) * 2)) {
                fdt_addr_t addr = fdt_addr_to_cpu(*cell);
                if (sizep) {
                        const fdt_size_t *size;

                        size = (fdt_size_t *)((char *)cell +
                                        sizeof(fdt_addr_t));
                        *sizep = fdt_size_to_cpu(*size);
                        debug("addr=%08lx, size=%08x\n",
                              (ulong)addr, *sizep);
                } else {
                        debug("%08lx\n", (ulong)addr);
                }
                return addr;
        }
        debug("(not found)\n");
        return FDT_ADDR_T_NONE;
}

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);
}

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;
                const char *p;
                int len;

                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;
                for (p = name + strlen(name) - 1; p > name; p--) {
                        if (!isdigit(*p)) {
                                *seqp = simple_strtoul(p + 1, NULL, 10);
                                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)) {
                printf("No valid FDT 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");
                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;
}

/**
 * Decode a list of GPIOs from an FDT. This creates a list of GPIOs with no
 * terminating item.
 *
 * @param blob          FDT blob to use
 * @param node          Node to look at
 * @param prop_name     Node property name
 * @param gpio          Array of gpio elements to fill from FDT. This will be
 *                      untouched if either 0 or an error is returned
 * @param max_count     Maximum number of elements allowed
 * @return number of GPIOs read if ok, -FDT_ERR_BADLAYOUT if max_count would
 * be exceeded, or -FDT_ERR_NOTFOUND if the property is missing.
 */
int fdtdec_decode_gpios(const void *blob, int node, const char *prop_name,
                struct fdt_gpio_state *gpio, int max_count)
{
        const struct fdt_property *prop;
        const u32 *cell;
        const char *name;
        int len, i;

        debug("%s: %s\n", __func__, prop_name);
        assert(max_count > 0);
        prop = fdt_get_property(blob, node, prop_name, &len);
        if (!prop) {
                debug("%s: property '%s' missing\n", __func__, prop_name);
                return -FDT_ERR_NOTFOUND;
        }

        /* We will use the name to tag the GPIO */
        name = fdt_string(blob, fdt32_to_cpu(prop->nameoff));
        cell = (u32 *)prop->data;
        len /= sizeof(u32) * 3;         /* 3 cells per GPIO record */
        if (len > max_count) {
                debug(" %s: too many GPIOs / cells for "
                        "property '%s'\n", __func__, prop_name);
                return -FDT_ERR_BADLAYOUT;
        }

        /* Read out the GPIO data from the cells */
        for (i = 0; i < len; i++, cell += 3) {
                gpio[i].gpio = fdt32_to_cpu(cell[1]);
                gpio[i].flags = fdt32_to_cpu(cell[2]);
                gpio[i].name = name;
        }

        return len;
}

int fdtdec_decode_gpio(const void *blob, int node, const char *prop_name,
                struct fdt_gpio_state *gpio)
{
        int err;

        debug("%s: %s\n", __func__, prop_name);
        gpio->gpio = FDT_GPIO_NONE;
        gpio->name = NULL;
        err = fdtdec_decode_gpios(blob, node, prop_name, gpio, 1);
        return err == 1 ? 0 : err;
}

int fdtdec_get_gpio(struct fdt_gpio_state *gpio)
{
        int val;

        if (!fdt_gpio_isvalid(gpio))
                return -1;

        val = gpio_get_value(gpio->gpio);
        return gpio->flags & FDT_GPIO_ACTIVE_LOW ? val ^ 1 : val;
}

int fdtdec_set_gpio(struct fdt_gpio_state *gpio, int val)
{
        if (!fdt_gpio_isvalid(gpio))
                return -1;

        val = gpio->flags & FDT_GPIO_ACTIVE_LOW ? val ^ 1 : val;
        return gpio_set_value(gpio->gpio, val);
}

int fdtdec_setup_gpio(struct fdt_gpio_state *gpio)
{
        /*
         * Return success if there is no GPIO defined. This is used for
         * optional GPIOs)
         */
        if (!fdt_gpio_isvalid(gpio))
                return 0;

        if (gpio_request(gpio->gpio, gpio->name))
                return -1;
        return 0;
}

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;
}

static 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_pci_get_bdf(const void *fdt, int node, int *bdf)
{
        const fdt32_t *prop;
        int len;

        prop = fdt_getprop(fdt, node, "reg", &len);
        if (!prop)
                return len;

        *bdf = fdt32_to_cpu(*prop) & 0xffffff;

        return 0;
}

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;
}
#endif