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 #include <asm/global_data.h>
   9
  10 #include <asm/io.h>
  11
  12 #include "boston-regs.h"
  13
  14 DECLARE_GLOBAL_DATA_PTR;
  15
  16 int dram_init(void)
  17 {
  18         u32 ddrconf0 = __raw_readl((uint32_t *)BOSTON_PLAT_DDRCONF0);
  19
  20         gd->ram_size = (phys_size_t)(ddrconf0 & BOSTON_PLAT_DDRCONF0_SIZE) <<
  21                         30;
  22
  23         return 0;
  24 }
  25
  26 phys_size_t board_get_usable_ram_top(phys_size_t total_size)
  27 {
  28         DECLARE_GLOBAL_DATA_PTR;
  29
  30         if (gd->ram_top < CFG_SYS_SDRAM_BASE) {
  31                 /* 2GB wrapped around to 0 */
  32                 return CKSEG0ADDR(256 << 20);
  33         }
  34
  35         return min_t(unsigned long, gd->ram_top, CKSEG0ADDR(256 << 20));
  36 }