/*
 * Copyright (c) 2016 NextThing Co
 * Copyright (c) 2016 Free Electrons
 *
 * SPDX-License-Identifier:     GPL-2.0+
 */

#include <common.h>
#include <command.h>
#include <errno.h>
#include <malloc.h>

#include <linux/sizes.h>

#include <test/ut.h>
#include <test/overlay.h>
#include <test/suites.h>

/* 4k ought to be enough for anybody */
#define FDT_COPY_SIZE   (4 * SZ_1K)

extern u32 __dtb_test_fdt_base_begin;
extern u32 __dtb_test_fdt_overlay_begin;
extern u32 __dtb_test_fdt_overlay_stacked_begin;

static int ut_fdt_getprop_u32_by_index(void *fdt, const char *path,
                                    const char *name, int index,
                                    u32 *out)
{
        const fdt32_t *val;
        int node_off;
        int len;

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

        val = fdt_getprop(fdt, node_off, name, &len);
        if (!val || (len < (sizeof(uint32_t) * (index + 1))))
                return -FDT_ERR_NOTFOUND;

        *out = fdt32_to_cpu(*(val + index));

        return 0;
}

static int ut_fdt_getprop_u32(void *fdt, const char *path, const char *name,
                           u32 *out)
{
        return ut_fdt_getprop_u32_by_index(fdt, path, name, 0, out);
}

static int fdt_getprop_str(void *fdt, const char *path, const char *name,
                           const char **out)
{
        int node_off;
        int len;

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

        *out = fdt_stringlist_get(fdt, node_off, name, 0, &len);

        return len < 0 ? len : 0;
}

static int fdt_overlay_change_int_property(struct unit_test_state *uts)
{
        void *fdt = uts->priv;
        u32 val = 0;

        ut_assertok(ut_fdt_getprop_u32(fdt, "/test-node", "test-int-property",
                                    &val));
        ut_asserteq(43, val);

        return CMD_RET_SUCCESS;
}
OVERLAY_TEST(fdt_overlay_change_int_property, 0);

static int fdt_overlay_change_str_property(struct unit_test_state *uts)
{
        void *fdt = uts->priv;
        const char *val = NULL;

        ut_assertok(fdt_getprop_str(fdt, "/test-node", "test-str-property",
                                    &val));
        ut_asserteq_str("foobar", val);

        return CMD_RET_SUCCESS;
}
OVERLAY_TEST(fdt_overlay_change_str_property, 0);

static int fdt_overlay_add_str_property(struct unit_test_state *uts)
{
        void *fdt = uts->priv;
        const char *val = NULL;

        ut_assertok(fdt_getprop_str(fdt, "/test-node", "test-str-property-2",
                                    &val));
        ut_asserteq_str("foobar2", val);

        return CMD_RET_SUCCESS;
}
OVERLAY_TEST(fdt_overlay_add_str_property, 0);

static int fdt_overlay_add_node_by_phandle(struct unit_test_state *uts)
{
        void *fdt = uts->priv;
        int off;

        off = fdt_path_offset(fdt, "/test-node/new-node");
        ut_assert(off >= 0);

        ut_assertnonnull(fdt_getprop(fdt, off, "new-property", NULL));

        return CMD_RET_SUCCESS;
}
OVERLAY_TEST(fdt_overlay_add_node_by_phandle, 0);

static int fdt_overlay_add_node_by_path(struct unit_test_state *uts)
{
        void *fdt = uts->priv;
        int off;

        off = fdt_path_offset(fdt, "/new-node");
        ut_assert(off >= 0);

        ut_assertnonnull(fdt_getprop(fdt, off, "new-property", NULL));

        return CMD_RET_SUCCESS;
}
OVERLAY_TEST(fdt_overlay_add_node_by_path, 0);

static int fdt_overlay_add_subnode_property(struct unit_test_state *uts)
{
        void *fdt = uts->priv;
        int off;

        off = fdt_path_offset(fdt, "/test-node/sub-test-node");
        ut_assert(off >= 0);

        ut_assertnonnull(fdt_getprop(fdt, off, "sub-test-property", NULL));
        ut_assertnonnull(fdt_getprop(fdt, off, "new-sub-test-property", NULL));

        return CMD_RET_SUCCESS;
}
OVERLAY_TEST(fdt_overlay_add_subnode_property, 0);

static int fdt_overlay_local_phandle(struct unit_test_state *uts)
{
        uint32_t local_phandle;
        void *fdt = uts->priv;
        u32 val = 0;
        int off;

        off = fdt_path_offset(fdt, "/new-local-node");
        ut_assert(off >= 0);

        local_phandle = fdt_get_phandle(fdt, off);
        ut_assert(local_phandle);

        ut_assertok(ut_fdt_getprop_u32_by_index(fdt, "/", "test-several-phandle",
                                             0, &val));
        ut_asserteq(local_phandle, val);

        ut_assertok(ut_fdt_getprop_u32_by_index(fdt, "/", "test-several-phandle",
                                             1, &val));
        ut_asserteq(local_phandle, val);

        return CMD_RET_SUCCESS;
}
OVERLAY_TEST(fdt_overlay_local_phandle, 0);

static int fdt_overlay_local_phandles(struct unit_test_state *uts)
{
        uint32_t local_phandle, test_phandle;
        void *fdt = uts->priv;
        u32 val = 0;
        int off;

        off = fdt_path_offset(fdt, "/new-local-node");
        ut_assert(off >= 0);

        local_phandle = fdt_get_phandle(fdt, off);
        ut_assert(local_phandle);

        off = fdt_path_offset(fdt, "/test-node");
        ut_assert(off >= 0);

        test_phandle = fdt_get_phandle(fdt, off);
        ut_assert(test_phandle);

        ut_assertok(ut_fdt_getprop_u32_by_index(fdt, "/", "test-phandle", 0,
                                             &val));
        ut_asserteq(test_phandle, val);

        ut_assertok(ut_fdt_getprop_u32_by_index(fdt, "/", "test-phandle", 1,
                                             &val));
        ut_asserteq(local_phandle, val);

        return CMD_RET_SUCCESS;
}
OVERLAY_TEST(fdt_overlay_local_phandles, 0);

static int fdt_overlay_stacked(struct unit_test_state *uts)
{
        void *fdt = uts->priv;
        u32 val = 0;

        ut_assertok(ut_fdt_getprop_u32(fdt, "/new-local-node",
                                       "stacked-test-int-property", &val));
        ut_asserteq(43, val);

        return CMD_RET_SUCCESS;
}
OVERLAY_TEST(fdt_overlay_stacked, 0);

int do_ut_overlay(cmd_tbl_t *cmdtp, int flag, int argc, char * const argv[])
{
        struct unit_test *tests = ll_entry_start(struct unit_test,
                                                 overlay_test);
        const int n_ents = ll_entry_count(struct unit_test, overlay_test);
        struct unit_test_state *uts;
        void *fdt_base = &__dtb_test_fdt_base_begin;
        void *fdt_overlay = &__dtb_test_fdt_overlay_begin;
        void *fdt_overlay_stacked = &__dtb_test_fdt_overlay_stacked_begin;
        void *fdt_base_copy, *fdt_overlay_copy, *fdt_overlay_stacked_copy;
        int ret = -ENOMEM;

        uts = calloc(1, sizeof(*uts));
        if (!uts)
                return -ENOMEM;

        ut_assertok(fdt_check_header(fdt_base));
        ut_assertok(fdt_check_header(fdt_overlay));

        fdt_base_copy = malloc(FDT_COPY_SIZE);
        if (!fdt_base_copy)
                goto err1;
        uts->priv = fdt_base_copy;

        fdt_overlay_copy = malloc(FDT_COPY_SIZE);
        if (!fdt_overlay_copy)
                goto err2;

        fdt_overlay_stacked_copy = malloc(FDT_COPY_SIZE);
        if (!fdt_overlay_stacked_copy)
                goto err3;

        /*
         * Resize the FDT to 4k so that we have room to operate on
         *
         * (and relocate it since the memory might be mapped
         * read-only)
         */
        ut_assertok(fdt_open_into(fdt_base, fdt_base_copy, FDT_COPY_SIZE));

        /*
         * Resize the overlay to 4k so that we have room to operate on
         *
         * (and relocate it since the memory might be mapped
         * read-only)
         */
        ut_assertok(fdt_open_into(fdt_overlay, fdt_overlay_copy,
                                  FDT_COPY_SIZE));

        /*
         * Resize the stacked overlay to 4k so that we have room to operate on
         *
         * (and relocate it since the memory might be mapped
         * read-only)
         */
        ut_assertok(fdt_open_into(fdt_overlay_stacked, fdt_overlay_stacked_copy,
                                  FDT_COPY_SIZE));

        /* Apply the overlay */
        ut_assertok(fdt_overlay_apply(fdt_base_copy, fdt_overlay_copy));

        /* Apply the stacked overlay */
        ut_assertok(fdt_overlay_apply(fdt_base_copy, fdt_overlay_stacked_copy));

        ret = cmd_ut_category("overlay", tests, n_ents, argc, argv);

        free(fdt_overlay_stacked_copy);
err3:
        free(fdt_overlay_copy);
err2:
        free(fdt_base_copy);
err1:
        free(uts);

        return ret;
}