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 #ifdef CONFIG_POST
  28
  29 /* There are two tests for dsPIC currently implemented:
  30  * 1. dsPIC ready test. Done in board_early_init_f(). Only result verified here.
  31  * 2. dsPIC POST result test.  This test gets dsPIC POST codes and version.
  32  */
  33
  34 #include <post.h>
  35
  36 #include <i2c.h>
  37 #include <asm/io.h>
  38
  39 DECLARE_GLOBAL_DATA_PTR;
  40
  41 #define DSPIC_POST_ERROR_REG    0x800
  42 #define DSPIC_SYS_ERROR_REG     0x802
  43 #define DSPIC_VERSION_REG       0x804
  44
  45 #if CONFIG_POST & CFG_POST_BSPEC1
  46
  47 /* Verify that dsPIC ready test done early at hw init passed ok */
  48 int dspic_init_post_test(int flags)
  49 {
  50         if (in_be32((void *)CFG_DSPIC_TEST_ADDR) & CFG_DSPIC_TEST_MASK) {
  51                 post_log("dsPIC init test failed\n");
  52                 return 1;
  53         }
  54
  55         return 0;
  56 }
  57
  58 #endif /* CONFIG_POST & CFG_POST_BSPEC1 */
  59
  60 #if CONFIG_POST & CFG_POST_BSPEC2
  61 /* Read a register from the dsPIC. */
  62 int dspic_read(ushort reg)
  63 {
  64         uchar buf[2];
  65
  66         if (i2c_read(CFG_I2C_DSPIC_IO_ADDR, reg, 2, buf, 2))
  67                 return -1;
  68
  69         return (uint)((buf[0] << 8) | buf[1]);
  70 }
  71
  72 /* Verify error codes regs, display version */
  73 int dspic_post_test(int flags)
  74 {
  75         int data;
  76         int ret = 0;
  77
  78         post_log("\n");
  79         data = dspic_read(DSPIC_VERSION_REG);
  80         if (data == -1) {
  81                 post_log("dsPIC : failed read version\n");
  82                 ret = 1;
  83         } else {
  84                 post_log("dsPIC version: %u.%u\n",
  85                         (data >> 8) & 0xFF, data & 0xFF);
  86         }
  87
  88         data = dspic_read(DSPIC_POST_ERROR_REG);
  89         if (data != 0) ret = 1;
  90         if (data == -1) {
  91                 post_log("dsPIC : failed read POST code\n");
  92         } else {
  93                 post_log("dsPIC POST code 0x%04X\n", data);
  94         }
  95
  96         data = dspic_read(DSPIC_SYS_ERROR_REG);
  97         if (data == -1) {
  98                 post_log("dsPIC : failed read system error\n");
  99                 ret = 1;
 100         } else if (data != 0) {
 101                 post_log("dsPIC SYS-ERROR code: 0x%04X\n", data);
 102                 ret = 1;
 103         }
 104
 105         return ret;
 106 }
 107
 108 #endif /* CONFIG_POST & CFG_POST_BSPEC2 */
 109 #endif /* CONFIG_POST */