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 /* This test attempts to verify board GDC. A scratch register tested, then
  27  * simple memory test (get_ram_size()) run over GDC memory.
  28  */
  29
  30 #include <post.h>
  31
  32 #include <asm/io.h>
  33
  34 DECLARE_GLOBAL_DATA_PTR;
  35
  36 #define GDC_SCRATCH_REG 0xC1FF8044
  37 #define GDC_VERSION_REG 0xC1FF8084
  38 #define GDC_RAM_START   0xC0000000
  39 #define GDC_RAM_END     0xC2000000
  40
  41 #if CONFIG_POST & CONFIG_SYS_POST_BSPEC4
  42
  43 static int gdc_test_reg_one(uint value)
  44 {
  45         int ret;
  46         uint read_value;
  47
  48         /* write test pattern */
  49         out_be32((void *)GDC_SCRATCH_REG, value);
  50         /* read other location (protect against data lines capacity) */
  51         ret = in_be32((void *)GDC_RAM_START);
  52         /* verify test pattern */
  53         read_value = in_be32((void *)GDC_SCRATCH_REG);
  54         if (read_value != value) {
  55                 post_log("GDC SCRATCH test failed write %08X, read %08X\n",
  56                         value, read_value);
  57         }
  58
  59         return (read_value != value);
  60 }
  61
  62 /* Verify GDC, get memory size */
  63 int gdc_post_test(int flags)
  64 {
  65         uint   old_value;
  66         int    ret = 0;
  67
  68         post_log("\n");
  69         old_value = in_be32((void *)GDC_SCRATCH_REG);
  70
  71         /*
  72          * GPIOC2 register behaviour: the LIME graphics processor has a
  73          * maximum of 5 GPIO ports that can be used in this hardware
  74          * configuration. Thus only the  bits  for these 5 GPIOs can be
  75          * activated in the GPIOC2 register. All other bits will always be
  76          * read as zero.
  77          */
  78         if (gdc_test_reg_one(0x00150015))
  79                 ret = 1;
  80         if (gdc_test_reg_one(0x000A000A))
  81                 ret = 1;
  82
  83         out_be32((void *)GDC_SCRATCH_REG, old_value);
  84
  85         old_value = in_be32((void *)GDC_VERSION_REG);
  86         post_log("GDC chip version %u.%u, year %04X\n",
  87                 (old_value >> 8) & 0xFF, old_value & 0xFF,
  88                 (old_value >> 16) & 0xFFFF);
  89
  90         old_value = get_ram_size((void *)GDC_RAM_START,
  91                                  GDC_RAM_END - GDC_RAM_START);
  92         post_log("GDC RAM size: %d bytes\n", old_value);
  93
  94         return ret;
  95 }
  96 #endif /* CONFIG_POST & CONFIG_SYS_POST_BSPEC4 */