post/board/lwmon5/gdc.c

   1 /*
   2  * (C) Copyright 2008 Dmitry Rakhchev, EmCraft Systems, rda@emcraft.com
   3  *
   4  * Developed for DENX Software Engineering GmbH
   5  *
   6  * See file CREDITS for list of people who contributed to this
   7  * project.
   8  *
   9  * This program is free software; you can redistribute it and/or
  10  * modify it under the terms of the GNU General Public License as
  11  * published by the Free Software Foundation; either version 2 of
  12  * the License, or (at your option) any later version.
  13  *
  14  * This program is distributed in the hope that it will be useful,
  15  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  16  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  17  * GNU General Public License for more details.
  18  *
  19  * You should have received a copy of the GNU General Public License
  20  * along with this program; if not, write to the Free Software
  21  * Foundation, Inc., 59 Temple Place, Suite 330, Boston,
  22  * MA 02111-1307 USA
  23  */
  24 #include <common.h>
  25
  26 #ifdef CONFIG_POST
  27
  28 /* This test attempts to verify board GDC. A scratch register tested, then
  29  * simple memory test (get_ram_size()) run over GDC memory.
  30  */
  31
  32 #include <post.h>
  33
  34 #include <asm/io.h>
  35
  36 DECLARE_GLOBAL_DATA_PTR;
  37
  38 #define GDC_SCRATCH_REG 0xC1FF8044
  39 #define GDC_VERSION_REG 0xC1FF8084
  40 #define GDC_RAM_START   0xC0000000
  41 #define GDC_RAM_END     0xC2000000
  42
  43 #if CONFIG_POST & CFG_POST_BSPEC4
  44
  45 static int gdc_test_reg_one(uint value)
  46 {
  47         int ret = 0;
  48         uint read_value;
  49
  50         /* write test pattern */
  51         out_be32((void *)GDC_SCRATCH_REG, value);
  52         /* read other location (protect against data lines capacity) */
  53         ret = in_be32((void *)GDC_RAM_START);
  54         /* verify test pattern */
  55         read_value = in_be32((void *)GDC_SCRATCH_REG);
  56         if (read_value != value) {
  57                 post_log("GDC SCRATCH test failed write %08X, read %08X\n",
  58                         value, read_value);
  59                 ret = 1;
  60         }
  61
  62         return ret;
  63 }
  64
  65 /* Verify GDC, get memory size */
  66 int gdc_post_test(int flags)
  67 {
  68         uint   old_value;
  69         int    ret = 0;
  70
  71         post_log("\n");
  72         old_value = in_be32((void *)GDC_SCRATCH_REG);
  73
  74         if (gdc_test_reg_one(0x55555555))
  75                 ret = 1;
  76         if (gdc_test_reg_one(0xAAAAAAAA))
  77                 ret = 1;
  78
  79         out_be32((void *)GDC_SCRATCH_REG, old_value);
  80
  81         old_value = in_be32((void *)GDC_VERSION_REG);
  82         post_log("GDC chip version %u.%u, year %04X\n",
  83                 (old_value >> 8) & 0xFF, old_value & 0xFF,
  84                 (old_value >> 16) & 0xFFFF);
  85
  86         old_value = get_ram_size((void *)GDC_RAM_START,
  87                                  GDC_RAM_END - GDC_RAM_START);
  88         post_log("GDC RAM size: %d bytes\n", old_value);
  89
  90         return ret;
  91 }
  92 #endif /* CONFIG_POST & CFG_POST_BSPEC4 */
  93 #endif /* CONFIG_POST */
  94