LXR uboot/arch/arm/mach-stm32mp/dram

   1// SPDX-License-Identifier: GPL-2.0+ OR BSD-3-Clause
   2/*
   3 * Copyright (C) 2018, STMicroelectronics - All Rights Reserved
   4 */
   5
   6#define LOG_CATEGORY LOGC_ARCH
   7
   8#include <common.h>
   9#include <dm.h>
  10#include <image.h>
  11#include <init.h>
  12#include <lmb.h>
  13#include <log.h>
  14#include <ram.h>
  15#include <asm/global_data.h>
  16#include <asm/system.h>
  17
  18DECLARE_GLOBAL_DATA_PTR;
  19
  20int dram_init(void)
  21{
  22        struct ram_info ram;
  23        struct udevice *dev;
  24        int ret;
  25
  26        ret = uclass_get_device(UCLASS_RAM, 0, &dev);
  27        if (ret) {
  28                log_debug("RAM init failed: %d\n", ret);
  29                return ret;
  30        }
  31        ret = ram_get_info(dev, &ram);
  32        if (ret) {
  33                log_debug("Cannot get RAM size: %d\n", ret);
  34                return ret;
  35        }
  36        log_debug("RAM init base=%lx, size=%x\n", ram.base, ram.size);
  37
  38        gd->ram_size = ram.size;
  39
  40        return 0;
  41}
  42
  43ulong board_get_usable_ram_top(ulong total_size)
  44{
  45        phys_size_t size;
  46        phys_addr_t reg;
  47        struct lmb lmb;
  48
  49        if (!total_size)
  50                return gd->ram_top;
  51
  52        /* found enough not-reserved memory to relocated U-Boot */
  53        lmb_init(&lmb);
  54        lmb_add(&lmb, gd->ram_base, gd->ram_size);
  55        boot_fdt_add_mem_rsv_regions(&lmb, (void *)gd->fdt_blob);
  56        /* add 8M for reserved memory for display, fdt, gd,... */
  57        size = ALIGN(SZ_8M + CONFIG_SYS_MALLOC_LEN + total_size, MMU_SECTION_SIZE),
  58        reg = lmb_alloc(&lmb, size, MMU_SECTION_SIZE);
  59
  60        if (!reg)
  61                reg = gd->ram_top - size;
  62
  63        /* before relocation, mark the U-Boot memory as cacheable by default */
  64        if (!(gd->flags & GD_FLG_RELOC))
  65                mmu_set_region_dcache_behaviour(reg, size, DCACHE_DEFAULT_OPTION);
  66
  67        return reg + size;
  68}
  69