// SPDX-License-Identifier: GPL-2.0+
/*
 * Copyright (C) 2016 Google, Inc
 * Written by Simon Glass <sjg@chromium.org>
 */

#include <common.h>
#include <errno.h>
#include <image.h>
#include <linux/libfdt.h>
#include <spl.h>

#ifndef CONFIG_SYS_BOOTM_LEN
#define CONFIG_SYS_BOOTM_LEN    (64 << 20)
#endif

/**
 * spl_fit_get_image_name(): By using the matching configuration subnode,
 * retrieve the name of an image, specified by a property name and an index
 * into that.
 * @fit:        Pointer to the FDT blob.
 * @images:     Offset of the /images subnode.
 * @type:       Name of the property within the configuration subnode.
 * @index:      Index into the list of strings in this property.
 * @outname:    Name of the image
 *
 * Return:      0 on success, or a negative error number
 */
static int spl_fit_get_image_name(const void *fit, int images,
                                  const char *type, int index,
                                  char **outname)
{
        const char *name, *str;
        __maybe_unused int node;
        int conf_node;
        int len, i;

        conf_node = fit_find_config_node(fit);
        if (conf_node < 0) {
#ifdef CONFIG_SPL_LIBCOMMON_SUPPORT
                printf("No matching DT out of these options:\n");
                for (node = fdt_first_subnode(fit, conf_node);
                     node >= 0;
                     node = fdt_next_subnode(fit, node)) {
                        name = fdt_getprop(fit, node, "description", &len);
                        printf("   %s\n", name);
                }
#endif
                return conf_node;
        }

        name = fdt_getprop(fit, conf_node, type, &len);
        if (!name) {
                debug("cannot find property '%s': %d\n", type, len);
                return -EINVAL;
        }

        str = name;
        for (i = 0; i < index; i++) {
                str = strchr(str, '\0') + 1;
                if (!str || (str - name >= len)) {
                        debug("no string for index %d\n", index);
                        return -E2BIG;
                }
        }

        *outname = (char *)str;
        return 0;
}

/**
 * spl_fit_get_image_node(): By using the matching configuration subnode,
 * retrieve the name of an image, specified by a property name and an index
 * into that.
 * @fit:        Pointer to the FDT blob.
 * @images:     Offset of the /images subnode.
 * @type:       Name of the property within the configuration subnode.
 * @index:      Index into the list of strings in this property.
 *
 * Return:      the node offset of the respective image node or a negative
 *              error number.
 */
static int spl_fit_get_image_node(const void *fit, int images,
                                  const char *type, int index)
{
        char *str;
        int err;
        int node;

        err = spl_fit_get_image_name(fit, images, type, index, &str);
        if (err)
                return err;

        debug("%s: '%s'\n", type, str);

        node = fdt_subnode_offset(fit, images, str);
        if (node < 0) {
                debug("cannot find image node '%s': %d\n", str, node);
                return -EINVAL;
        }

        return node;
}

static int get_aligned_image_offset(struct spl_load_info *info, int offset)
{
        /*
         * If it is a FS read, get the first address before offset which is
         * aligned to ARCH_DMA_MINALIGN. If it is raw read return the
         * block number to which offset belongs.
         */
        if (info->filename)
                return offset & ~(ARCH_DMA_MINALIGN - 1);

        return offset / info->bl_len;
}

static int get_aligned_image_overhead(struct spl_load_info *info, int offset)
{
        /*
         * If it is a FS read, get the difference between the offset and
         * the first address before offset which is aligned to
         * ARCH_DMA_MINALIGN. If it is raw read return the offset within the
         * block.
         */
        if (info->filename)
                return offset & (ARCH_DMA_MINALIGN - 1);

        return offset % info->bl_len;
}

static int get_aligned_image_size(struct spl_load_info *info, int data_size,
                                  int offset)
{
        data_size = data_size + get_aligned_image_overhead(info, offset);

        if (info->filename)
                return data_size;

        return (data_size + info->bl_len - 1) / info->bl_len;
}

#ifdef CONFIG_SPL_FPGA_SUPPORT
__weak int spl_load_fpga_image(struct spl_load_info *info, size_t length,
                               int nr_sectors, int sector_offset)
{
        return 0;
}
#endif

/**
 * spl_load_fit_image(): load the image described in a certain FIT node
 * @info:       points to information about the device to load data from
 * @sector:     the start sector of the FIT image on the device
 * @fit:        points to the flattened device tree blob describing the FIT
 *              image
 * @base_offset: the beginning of the data area containing the actual
 *              image data, relative to the beginning of the FIT
 * @node:       offset of the DT node describing the image to load (relative
 *              to @fit)
 * @image_info: will be filled with information about the loaded image
 *              If the FIT node does not contain a "load" (address) property,
 *              the image gets loaded to the address pointed to by the
 *              load_addr member in this struct.
 *
 * Return:      0 on success or a negative error number.
 */
static int spl_load_fit_image(struct spl_load_info *info, ulong sector,
                              void *fit, ulong base_offset, int node,
                              struct spl_image_info *image_info)
{
        int offset, sector_offset;
        size_t length;
        int len;
        ulong size;
        ulong load_addr, load_ptr;
        void *src;
        ulong overhead;
        int nr_sectors;
        int align_len = ARCH_DMA_MINALIGN - 1;
        uint8_t image_comp = -1, type = -1;
        const void *data;
        bool external_data = false;

        if (IS_ENABLED(CONFIG_SPL_FPGA_SUPPORT) ||
            (IS_ENABLED(CONFIG_SPL_OS_BOOT) && IS_ENABLED(CONFIG_SPL_GZIP))) {
                if (fit_image_get_type(fit, node, &type))
                        puts("Cannot get image type.\n");
                else
                        debug("%s ", genimg_get_type_name(type));
        }

        if (IS_ENABLED(CONFIG_SPL_OS_BOOT) && IS_ENABLED(CONFIG_SPL_GZIP)) {
                if (fit_image_get_comp(fit, node, &image_comp))
                        puts("Cannot get image compression format.\n");
                else
                        debug("%s ", genimg_get_comp_name(image_comp));
        }

        if (fit_image_get_load(fit, node, &load_addr))
                load_addr = image_info->load_addr;

        if (!fit_image_get_data_position(fit, node, &offset)) {
                external_data = true;
        } else if (!fit_image_get_data_offset(fit, node, &offset)) {
                offset += base_offset;
                external_data = true;
        }

        if (external_data) {
                /* External data */
                if (fit_image_get_data_size(fit, node, &len))
                        return -ENOENT;

                load_ptr = (load_addr + align_len) & ~align_len;
                length = len;

                overhead = get_aligned_image_overhead(info, offset);
                nr_sectors = get_aligned_image_size(info, length, offset);
                sector_offset = sector + get_aligned_image_offset(info, offset);

#ifdef CONFIG_SPL_FPGA_SUPPORT
                if (type == IH_TYPE_FPGA) {
                        return spl_load_fpga_image(info, length, nr_sectors,
                                                   sector_offset);
                }
#endif

                if (info->read(info, sector_offset,
                               nr_sectors, (void *)load_ptr) != nr_sectors)
                        return -EIO;

                debug("External data: dst=%lx, offset=%x, size=%lx\n",
                      load_ptr, offset, (unsigned long)length);
                src = (void *)load_ptr + overhead;
        } else {
                /* Embedded data */
                if (fit_image_get_data(fit, node, &data, &length)) {
                        puts("Cannot get image data/size\n");
                        return -ENOENT;
                }
                debug("Embedded data: dst=%lx, size=%lx\n", load_addr,
                      (unsigned long)length);
                src = (void *)data;
        }

#ifdef CONFIG_SPL_FIT_SIGNATURE
        printf("## Checking hash(es) for Image %s ... ",
               fit_get_name(fit, node, NULL));
        if (!fit_image_verify_with_data(fit, node,
                                         src, length))
                return -EPERM;
        puts("OK\n");
#endif

#ifdef CONFIG_SPL_FIT_IMAGE_POST_PROCESS
        board_fit_image_post_process(&src, &length);
#endif

        if (IS_ENABLED(CONFIG_SPL_OS_BOOT)      &&
            IS_ENABLED(CONFIG_SPL_GZIP)         &&
            image_comp == IH_COMP_GZIP          &&
            type == IH_TYPE_KERNEL) {
                size = length;
                if (gunzip((void *)load_addr, CONFIG_SYS_BOOTM_LEN,
                           src, &size)) {
                        puts("Uncompressing error\n");
                        return -EIO;
                }
                length = size;
        } else {
                memcpy((void *)load_addr, src, length);
        }

        if (image_info) {
                image_info->load_addr = load_addr;
                image_info->size = length;
                image_info->entry_point = fdt_getprop_u32(fit, node, "entry");
        }

        return 0;
}

static int spl_fit_append_fdt(struct spl_image_info *spl_image,
                              struct spl_load_info *info, ulong sector,
                              void *fit, int images, ulong base_offset)
{
        struct spl_image_info image_info;
        int node, ret;

        /* Figure out which device tree the board wants to use */
        node = spl_fit_get_image_node(fit, images, FIT_FDT_PROP, 0);
        if (node < 0) {
                debug("%s: cannot find FDT node\n", __func__);
                return node;
        }

        /*
         * Read the device tree and place it after the image.
         * Align the destination address to ARCH_DMA_MINALIGN.
         */
        image_info.load_addr = spl_image->load_addr + spl_image->size;
        ret = spl_load_fit_image(info, sector, fit, base_offset, node,
                                 &image_info);

        if (ret < 0)
                return ret;

        /* Make the load-address of the FDT available for the SPL framework */
        spl_image->fdt_addr = (void *)image_info.load_addr;
#if !CONFIG_IS_ENABLED(FIT_IMAGE_TINY)
        /* Try to make space, so we can inject details on the loadables */
        ret = fdt_shrink_to_minimum(spl_image->fdt_addr, 8192);
#endif

        return ret;
}

static int spl_fit_record_loadable(const void *fit, int images, int index,
                                   void *blob, struct spl_image_info *image)
{
        int ret = 0;
#if !CONFIG_IS_ENABLED(FIT_IMAGE_TINY)
        char *name;
        int node;

        ret = spl_fit_get_image_name(fit, images, "loadables",
                                     index, &name);
        if (ret < 0)
                return ret;

        node = spl_fit_get_image_node(fit, images, "loadables", index);

        ret = fdt_record_loadable(blob, index, name, image->load_addr,
                                  image->size, image->entry_point,
                                  fdt_getprop(fit, node, "type", NULL),
                                  fdt_getprop(fit, node, "os", NULL));
#endif
        return ret;
}

static int spl_fit_image_get_os(const void *fit, int noffset, uint8_t *os)
{
#if CONFIG_IS_ENABLED(FIT_IMAGE_TINY)
        return -ENOTSUPP;
#else
        return fit_image_get_os(fit, noffset, os);
#endif
}

int spl_load_simple_fit(struct spl_image_info *spl_image,
                        struct spl_load_info *info, ulong sector, void *fit)
{
        int sectors;
        ulong size;
        unsigned long count;
        struct spl_image_info image_info;
        int node = -1;
        int images, ret;
        int base_offset, align_len = ARCH_DMA_MINALIGN - 1;
        int index = 0;

        /*
         * For FIT with external data, figure out where the external images
         * start. This is the base for the data-offset properties in each
         * image.
         */
        size = fdt_totalsize(fit);
        size = (size + 3) & ~3;
        base_offset = (size + 3) & ~3;

        /*
         * So far we only have one block of data from the FIT. Read the entire
         * thing, including that first block, placing it so it finishes before
         * where we will load the image.
         *
         * Note that we will load the image such that its first byte will be
         * at the load address. Since that byte may be part-way through a
         * block, we may load the image up to one block before the load
         * address. So take account of that here by subtracting an addition
         * block length from the FIT start position.
         *
         * In fact the FIT has its own load address, but we assume it cannot
         * be before CONFIG_SYS_TEXT_BASE.
         *
         * For FIT with data embedded, data is loaded as part of FIT image.
         * For FIT with external data, data is not loaded in this step.
         */
        fit = (void *)((CONFIG_SYS_TEXT_BASE - size - info->bl_len -
                        align_len) & ~align_len);
        sectors = get_aligned_image_size(info, size, 0);
        count = info->read(info, sector, sectors, fit);
        debug("fit read sector %lx, sectors=%d, dst=%p, count=%lu\n",
              sector, sectors, fit, count);
        if (count == 0)
                return -EIO;

        /* find the node holding the images information */
        images = fdt_path_offset(fit, FIT_IMAGES_PATH);
        if (images < 0) {
                debug("%s: Cannot find /images node: %d\n", __func__, images);
                return -1;
        }

#ifdef CONFIG_SPL_FPGA_SUPPORT
        node = spl_fit_get_image_node(fit, images, "fpga", 0);
        if (node >= 0) {
                /* Load the image and set up the spl_image structure */
                ret = spl_load_fit_image(info, sector, fit, base_offset, node,
                                         spl_image);
                if (ret) {
                        printf("%s: Cannot load the FPGA: %i\n", __func__, ret);
                        return ret;
                }
                puts("FPGA image loaded from FIT\n");
                node = -1;
        }
#endif

        /*
         * Find the U-Boot image using the following search order:
         *   - start at 'firmware' (e.g. an ARM Trusted Firmware)
         *   - fall back 'kernel' (e.g. a Falcon-mode OS boot
         *   - fall back to using the first 'loadables' entry
         */
        if (node < 0)
                node = spl_fit_get_image_node(fit, images, FIT_FIRMWARE_PROP,
                                              0);
#ifdef CONFIG_SPL_OS_BOOT
        if (node < 0)
                node = spl_fit_get_image_node(fit, images, FIT_KERNEL_PROP, 0);
#endif
        if (node < 0) {
                debug("could not find firmware image, trying loadables...\n");
                node = spl_fit_get_image_node(fit, images, "loadables", 0);
                /*
                 * If we pick the U-Boot image from "loadables", start at
                 * the second image when later loading additional images.
                 */
                index = 1;
        }
        if (node < 0) {
                debug("%s: Cannot find u-boot image node: %d\n",
                      __func__, node);
                return -1;
        }

        /* Load the image and set up the spl_image structure */
        ret = spl_load_fit_image(info, sector, fit, base_offset, node,
                                 spl_image);
        if (ret)
                return ret;

        /*
         * For backward compatibility, we treat the first node that is
         * as a U-Boot image, if no OS-type has been declared.
         */
        if (!spl_fit_image_get_os(fit, node, &spl_image->os))
                debug("Image OS is %s\n", genimg_get_os_name(spl_image->os));
#if !defined(CONFIG_SPL_OS_BOOT)
        else
                spl_image->os = IH_OS_U_BOOT;
#endif

        /*
         * Booting a next-stage U-Boot may require us to append the FDT.
         * We allow this to fail, as the U-Boot image might embed its FDT.
         */
        if (spl_image->os == IH_OS_U_BOOT)
                spl_fit_append_fdt(spl_image, info, sector, fit,
                                   images, base_offset);

        /* Now check if there are more images for us to load */
        for (; ; index++) {
                uint8_t os_type = IH_OS_INVALID;

                node = spl_fit_get_image_node(fit, images, "loadables", index);
                if (node < 0)
                        break;

                ret = spl_load_fit_image(info, sector, fit, base_offset, node,
                                         &image_info);
                if (ret < 0)
                        continue;

                if (!spl_fit_image_get_os(fit, node, &os_type))
                        debug("Loadable is %s\n", genimg_get_os_name(os_type));

                if (os_type == IH_OS_U_BOOT) {
                        spl_fit_append_fdt(&image_info, info, sector,
                                           fit, images, base_offset);
                        spl_image->fdt_addr = image_info.fdt_addr;
                }

                /*
                 * If the "firmware" image did not provide an entry point,
                 * use the first valid entry point from the loadables.
                 */
                if (spl_image->entry_point == FDT_ERROR &&
                    image_info.entry_point != FDT_ERROR)
                        spl_image->entry_point = image_info.entry_point;

                /* Record our loadables into the FDT */
                if (spl_image->fdt_addr)
                        spl_fit_record_loadable(fit, images, index,
                                                spl_image->fdt_addr,
                                                &image_info);
        }

        /*
         * If a platform does not provide CONFIG_SYS_UBOOT_START, U-Boot's
         * Makefile will set it to 0 and it will end up as the entry point
         * here. What it actually means is: use the load address.
         */
        if (spl_image->entry_point == FDT_ERROR || spl_image->entry_point == 0)
                spl_image->entry_point = spl_image->load_addr;

        return 0;
}