linux-imx

// SPDX-License-Identifier: GPL-2.0+

/*

 * Device tree based initialization code for reserved memory.

 *

 * Copyright (c) 2013, 2015 The Linux Foundation. All Rights Reserved.

 * Copyright (c) 2013,2014 Samsung Electronics Co., Ltd.

 *      http://www.samsung.com

 * Author: Marek Szyprowski <m.szyprowski@samsung.com>

 * Author: Josh Cartwright <joshc@codeaurora.org>

 */

​

#define pr_fmt(fmt) "OF: reserved mem: " fmt

​

#include <linux/err.h>

#include <linux/of.h>

#include <linux/of_fdt.h>

#include <linux/of_platform.h>

#include <linux/mm.h>

#include <linux/sizes.h>

#include <linux/of_reserved_mem.h>

#include <linux/sort.h>

#include <linux/slab.h>

#include <linux/memblock.h>

​

#define MAX_RESERVED_REGIONS    32

static struct reserved_mem reserved_mem[MAX_RESERVED_REGIONS];

static int reserved_mem_count;

​

static int __init early_init_dt_alloc_reserved_memory_arch(phys_addr_t size,

    phys_addr_t align, phys_addr_t start, phys_addr_t end, bool nomap,

    phys_addr_t *res_base)

{

    phys_addr_t base;

​

    end = !end ? MEMBLOCK_ALLOC_ANYWHERE : end;

    align = !align ? SMP_CACHE_BYTES : align;

    base = memblock_find_in_range(start, end, size, align);

    if (!base)

        return -ENOMEM;

​

    *res_base = base;

    if (nomap)

        return memblock_remove(base, size);

​

    return memblock_reserve(base, size);

}

​

/**

 * res_mem_save_node() - save fdt node for second pass initialization

 */

void __init fdt_reserved_mem_save_node(unsigned long node, const char *uname,

                      phys_addr_t base, phys_addr_t size)

{

    struct reserved_mem *rmem = &reserved_mem[reserved_mem_count];

​

    if (reserved_mem_count == ARRAY_SIZE(reserved_mem)) {

        pr_err("not enough space all defined regions.\n");

        return;

    }

​

    rmem->fdt_node = node;

    rmem->name = uname;

    rmem->base = base;

    rmem->size = size;

​

    reserved_mem_count++;

    return;

}

​

/**

 * res_mem_alloc_size() - allocate reserved memory described by 'size', 'align'

 *            and 'alloc-ranges' properties

 */

static int __init __reserved_mem_alloc_size(unsigned long node,

    const char *uname, phys_addr_t *res_base, phys_addr_t *res_size)

{

    int t_len = (dt_root_addr_cells + dt_root_size_cells) * sizeof(__be32);

    phys_addr_t start = 0, end = 0;

    phys_addr_t base = 0, align = 0, size;

    int len;

    const __be32 *prop;

    int nomap;

    int ret;

​

    prop = of_get_flat_dt_prop(node, "size", &len);

    if (!prop)

        return -EINVAL;

​

    if (len != dt_root_size_cells * sizeof(__be32)) {

        pr_err("invalid size property in '%s' node.\n", uname);

        return -EINVAL;

    }