board/socrates/sdram.c

   1 /*
   2  * (C) Copyright 2008
   3  * Sergei Poselenov, Emcraft Systems, sposelenov@emcraft.com.
   4  *
   5  * See file CREDITS for list of people who contributed to this
   6  * project.
   7  *
   8  * This program is free software; you can redistribute it and/or
   9  * modify it under the terms of the GNU General Public License as
  10  * published by the Free Software Foundation; either version 2 of
  11  * the License, or (at your option) any later version.
  12  *
  13  * This program is distributed in the hope that it will be useful,
  14  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  15  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.         See the
  16  * GNU General Public License for more details.
  17  *
  18  * You should have received a copy of the GNU General Public License
  19  * along with this program; if not, write to the Free Software
  20  * Foundation, Inc., 59 Temple Place, Suite 330, Boston,
  21  * MA 02111-1307 USA
  22  */
  23
  24
  25 #include <common.h>
  26 #include <asm/processor.h>
  27 #include <asm/immap_85xx.h>
  28 #include <asm/fsl_ddr_sdram.h>
  29 #include <asm/processor.h>
  30 #include <asm/mmu.h>
  31 #include <spd_sdram.h>
  32
  33
  34 #if !defined(CONFIG_SPD_EEPROM)
  35 /*
  36  * Autodetect onboard DDR SDRAM on 85xx platforms
  37  *
  38  * NOTE: Some of the hardcoded values are hardware dependant,
  39  *       so this should be extended for other future boards
  40  *       using this routine!
  41  */
  42 long int sdram_setup(int casl)
  43 {
  44         volatile ccsr_ddr_t *ddr = (void *)(CONFIG_SYS_MPC85xx_DDR_ADDR);
  45
  46         /*
  47          * Disable memory controller.
  48          */
  49         ddr->cs0_config = 0;
  50         ddr->sdram_cfg = 0;
  51
  52         ddr->cs0_bnds = CONFIG_SYS_DDR_CS0_BNDS;
  53         ddr->cs0_config = CONFIG_SYS_DDR_CS0_CONFIG;
  54         ddr->timing_cfg_0 = CONFIG_SYS_DDR_TIMING_0;
  55         ddr->timing_cfg_1 = CONFIG_SYS_DDR_TIMING_1;
  56         ddr->timing_cfg_2 = CONFIG_SYS_DDR_TIMING_2;
  57         ddr->sdram_mode = CONFIG_SYS_DDR_MODE;
  58         ddr->sdram_interval = CONFIG_SYS_DDR_INTERVAL;
  59         ddr->sdram_cfg_2 = CONFIG_SYS_DDR_CONFIG_2;
  60         ddr->sdram_clk_cntl = CONFIG_SYS_DDR_CLK_CONTROL;
  61
  62         asm ("sync;isync;msync");
  63         udelay(1000);
  64
  65         ddr->sdram_cfg = CONFIG_SYS_DDR_CONFIG;
  66         asm ("sync; isync; msync");
  67         udelay(1000);
  68
  69         if (get_ram_size(0, CONFIG_SYS_SDRAM_SIZE<<20) == CONFIG_SYS_SDRAM_SIZE<<20) {
  70                 /*
  71                  * OK, size detected -> all done
  72                  */
  73                 return CONFIG_SYS_SDRAM_SIZE<<20;
  74         }
  75
  76         return 0;                               /* nothing found !              */
  77 }
  78 #endif
  79
  80 phys_size_t initdram (int board_type)
  81 {
  82         long dram_size = 0;
  83 #if defined(CONFIG_SPD_EEPROM)
  84         dram_size = fsl_ddr_sdram();
  85         dram_size = setup_ddr_tlbs(dram_size / 0x100000);
  86         dram_size *= 0x100000;
  87 #else
  88         dram_size = sdram_setup(CONFIG_DDR_DEFAULT_CL);
  89 #endif
  90         return dram_size;
  91 }
  92
  93 #if defined(CONFIG_SYS_DRAM_TEST)
  94 int testdram (void)
  95 {
  96         uint *pstart = (uint *) CONFIG_SYS_MEMTEST_START;
  97         uint *pend = (uint *) CONFIG_SYS_MEMTEST_END;
  98         uint *p;
  99
 100         printf ("SDRAM test phase 1:\n");
 101         for (p = pstart; p < pend; p++)
 102                 *p = 0xaaaaaaaa;
 103
 104         for (p = pstart; p < pend; p++) {
 105                 if (*p != 0xaaaaaaaa) {
 106                         printf ("SDRAM test fails at: %08x\n", (uint) p);
 107                         return 1;
 108                 }
 109         }
 110
 111         printf ("SDRAM test phase 2:\n");
 112         for (p = pstart; p < pend; p++)
 113                 *p = 0x55555555;
 114
 115         for (p = pstart; p < pend; p++) {
 116                 if (*p != 0x55555555) {
 117                         printf ("SDRAM test fails at: %08x\n", (uint) p);
 118                         return 1;
 119                 }
 120         }
 121
 122         printf ("SDRAM test passed.\n");
 123         return 0;
 124 }
 125 #endif