board/freescale/mpc8308rdb/sdram.c

   1 /*
   2  * Copyright (C) 2007 Freescale Semiconductor, Inc.
   3  * Copyright (C) 2010 Ilya Yanok, Emcraft Systems, yanok@emcraft.com
   4  *
   5  * Authors: Nick.Spence@freescale.com
   6  *          Wilson.Lo@freescale.com
   7  *          scottwood@freescale.com
   8  *
   9  * This files is  mostly identical to the original from
  10  * board\freescale\mpc8315erdb\sdram.c
  11  *
  12  * SPDX-License-Identifier:     GPL-2.0+
  13  */
  14
  15 #include <common.h>
  16 #include <mpc83xx.h>
  17
  18 #include <asm/bitops.h>
  19 #include <asm/io.h>
  20
  21 #include <asm/processor.h>
  22
  23 DECLARE_GLOBAL_DATA_PTR;
  24
  25 /* Fixed sdram init -- doesn't use serial presence detect.
  26  *
  27  * This is useful for faster booting in configs where the RAM is unlikely
  28  * to be changed, or for things like NAND booting where space is tight.
  29  */
  30 static long fixed_sdram(void)
  31 {
  32         immap_t *im = (immap_t *)CONFIG_SYS_IMMR;
  33         u32 msize = CONFIG_SYS_DDR_SIZE * 1024 * 1024;
  34         u32 msize_log2 = __ilog2(msize);
  35
  36         out_be32(&im->sysconf.ddrlaw[0].bar,
  37                         CONFIG_SYS_DDR_SDRAM_BASE  & 0xfffff000);
  38         out_be32(&im->sysconf.ddrlaw[0].ar, LBLAWAR_EN | (msize_log2 - 1));
  39         out_be32(&im->sysconf.ddrcdr, CONFIG_SYS_DDRCDR_VALUE);
  40
  41         out_be32(&im->ddr.csbnds[0].csbnds, (msize - 1) >> 24);
  42         out_be32(&im->ddr.cs_config[0], CONFIG_SYS_DDR_CS0_CONFIG);
  43
  44         /* Currently we use only one CS, so disable the other bank. */
  45         out_be32(&im->ddr.cs_config[1], 0);
  46
  47         out_be32(&im->ddr.sdram_clk_cntl, CONFIG_SYS_DDR_SDRAM_CLK_CNTL);
  48         out_be32(&im->ddr.timing_cfg_3, CONFIG_SYS_DDR_TIMING_3);
  49         out_be32(&im->ddr.timing_cfg_1, CONFIG_SYS_DDR_TIMING_1);
  50         out_be32(&im->ddr.timing_cfg_2, CONFIG_SYS_DDR_TIMING_2);
  51         out_be32(&im->ddr.timing_cfg_0, CONFIG_SYS_DDR_TIMING_0);
  52
  53         out_be32(&im->ddr.sdram_cfg, CONFIG_SYS_DDR_SDRAM_CFG);
  54         out_be32(&im->ddr.sdram_cfg2, CONFIG_SYS_DDR_SDRAM_CFG2);
  55         out_be32(&im->ddr.sdram_mode, CONFIG_SYS_DDR_MODE);
  56         out_be32(&im->ddr.sdram_mode2, CONFIG_SYS_DDR_MODE2);
  57
  58         out_be32(&im->ddr.sdram_interval, CONFIG_SYS_DDR_INTERVAL);
  59         sync();
  60
  61         /* enable DDR controller */
  62         setbits_be32(&im->ddr.sdram_cfg, SDRAM_CFG_MEM_EN);
  63         sync();
  64
  65         return get_ram_size(CONFIG_SYS_DDR_SDRAM_BASE, msize);
  66 }
  67
  68 int initdram(void)
  69 {
  70         immap_t *im = (immap_t *)CONFIG_SYS_IMMR;
  71         u32 msize;
  72
  73         if ((in_be32(&im->sysconf.immrbar) & IMMRBAR_BASE_ADDR) != (u32)im)
  74                 return -ENXIO;
  75
  76         /* DDR SDRAM */
  77         msize = fixed_sdram();
  78
  79         /* return total bus SDRAM size(bytes)  -- DDR */
  80         gd->ram_size = msize;
  81
  82         return 0;
  83 }