board/imgtec/boston/ddr.c

   1 // SPDX-License-Identifier: GPL-2.0
   2 /*
   3  * Copyright (C) 2016 Imagination Technologies
   4  */
   5
   6 #include <common.h>
   7 #include <init.h>
   8
   9 #include <asm/io.h>
  10
  11 #include "boston-regs.h"
  12
  13 DECLARE_GLOBAL_DATA_PTR;
  14
  15 int dram_init(void)
  16 {
  17         u32 ddrconf0 = __raw_readl((uint32_t *)BOSTON_PLAT_DDRCONF0);
  18
  19         gd->ram_size = (phys_size_t)(ddrconf0 & BOSTON_PLAT_DDRCONF0_SIZE) <<
  20                         30;
  21
  22         return 0;
  23 }
  24
  25 ulong board_get_usable_ram_top(ulong total_size)
  26 {
  27         DECLARE_GLOBAL_DATA_PTR;
  28
  29         if (gd->ram_top < CONFIG_SYS_SDRAM_BASE) {
  30                 /* 2GB wrapped around to 0 */
  31                 return CKSEG0ADDR(256 << 20);
  32         }
  33
  34         return min_t(unsigned long, gd->ram_top, CKSEG0ADDR(256 << 20));
  35 }