post/board/lwmon5/dspic.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
  25 #include <common.h>
  26
  27 /* There are two tests for dsPIC currently implemented:
  28  * 1. dsPIC ready test. Done in board_early_init_f(). Only result verified here.
  29  * 2. dsPIC POST result test.  This test gets dsPIC POST codes and version.
  30  */
  31
  32 #include <post.h>
  33
  34 #include <i2c.h>
  35 #include <asm/io.h>
  36
  37 DECLARE_GLOBAL_DATA_PTR;
  38
  39 #define DSPIC_POST_ERROR_REG    0x800
  40 #define DSPIC_SYS_ERROR_REG     0x802
  41 #define DSPIC_VERSION_REG       0x804
  42
  43 #if CONFIG_POST & CONFIG_SYS_POST_BSPEC1
  44
  45 /* Verify that dsPIC ready test done early at hw init passed ok */
  46 int dspic_init_post_test(int flags)
  47 {
  48         if (in_be32((void *)CONFIG_SYS_DSPIC_TEST_ADDR) & CONFIG_SYS_DSPIC_TEST_MASK) {
  49                 post_log("dsPIC init test failed\n");
  50                 return 1;
  51         }
  52
  53         return 0;
  54 }
  55
  56 #endif /* CONFIG_POST & CONFIG_SYS_POST_BSPEC1 */
  57
  58 #if CONFIG_POST & CONFIG_SYS_POST_BSPEC2
  59 /* Read a register from the dsPIC. */
  60 int dspic_read(ushort reg)
  61 {
  62         uchar buf[2];
  63
  64         if (i2c_read(CONFIG_SYS_I2C_DSPIC_IO_ADDR, reg, 2, buf, 2))
  65                 return -1;
  66
  67         return (uint)((buf[0] << 8) | buf[1]);
  68 }
  69
  70 /* Verify error codes regs, display version */
  71 int dspic_post_test(int flags)
  72 {
  73         int data;
  74         int ret = 0;
  75
  76         post_log("\n");
  77         data = dspic_read(DSPIC_VERSION_REG);
  78         if (data == -1) {
  79                 post_log("dsPIC : failed read version\n");
  80                 ret = 1;
  81         } else {
  82                 post_log("dsPIC version: %u.%u\n",
  83                         (data >> 8) & 0xFF, data & 0xFF);
  84         }
  85
  86         data = dspic_read(DSPIC_POST_ERROR_REG);
  87         if (data != 0) ret = 1;
  88         if (data == -1) {
  89                 post_log("dsPIC : failed read POST code\n");
  90         } else {
  91                 post_log("dsPIC POST code 0x%04X\n", data);
  92         }
  93
  94         data = dspic_read(DSPIC_SYS_ERROR_REG);
  95         if (data == -1) {
  96                 post_log("dsPIC : failed read system error\n");
  97                 ret = 1;
  98         } else {
  99                 post_log("dsPIC SYS-ERROR code: 0x%04X\n", data);
 100         }
 101
 102         return ret;
 103 }
 104
 105 #endif /* CONFIG_POST & CONFIG_SYS_POST_BSPEC2 */