board/nvidia/common/emc.c

   1 /*
   2  * Copyright (c) 2011 The Chromium OS Authors.
   3  *
   4  * SPDX-License-Identifier:     GPL-2.0+
   5  */
   6
   7 #include <common.h>
   8 #include <asm/io.h>
   9 #include <asm/arch/clock.h>
  10 #include <asm/arch/emc.h>
  11 #include <asm/arch/pmu.h>
  12 #include <asm/arch/tegra.h>
  13 #include <asm/arch-tegra/ap.h>
  14 #include <asm/arch-tegra/clk_rst.h>
  15 #include <asm/arch-tegra/sys_proto.h>
  16
  17 DECLARE_GLOBAL_DATA_PTR;
  18
  19 /* These rates are hard-coded for now, until fdt provides them */
  20 #define EMC_SDRAM_RATE_T20      (333000 * 2 * 1000)
  21 #define EMC_SDRAM_RATE_T25      (380000 * 2 * 1000)
  22
  23 int board_emc_init(void)
  24 {
  25         unsigned rate;
  26
  27         switch (tegra_get_chip_sku()) {
  28         default:
  29         case TEGRA_SOC_T20:
  30                 rate  = EMC_SDRAM_RATE_T20;
  31                 break;
  32         case TEGRA_SOC_T25:
  33                 rate  = EMC_SDRAM_RATE_T25;
  34                 break;
  35         }
  36         return tegra_set_emc(gd->fdt_blob, rate);
  37 }