board/ssv/common/wd_pio.c

   1 /*
   2  * (C) Copyright 2004, Li-Pro.Net <www.li-pro.net>
   3  * Stephan Linz <linz@li-pro.net>
   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 #include <common.h>
  25 #include <command.h>
  26 #include <nios.h>
  27 #include <nios-io.h>
  28
  29 #if     defined(CONFIG_HW_WATCHDOG)
  30
  31 #if !defined(CONFIG_HW_WDENA_BASE)
  32 #error "*** CONFIG_HW_WDENA_BASE not defined ***"
  33 #if !defined(CONFIG_HW_WDENA_BIT)
  34 #error "*** CONFIG_HW_WDENA_BIT not defined ***"
  35 #endif
  36 #endif
  37
  38 #if !defined(CONFIG_HW_WDTOG_BASE)
  39 #error "*** CONFIG_HW_WDTOG_BASE not defined ***"
  40 #if !defined(CONFIG_HW_WDTOG_BIT)
  41 #error "*** CONFIG_HW_WDTOG_BIT not defined ***"
  42 #endif
  43 #endif
  44
  45 #ifdef  CONFIG_HW_WDPORT_WRONLY /* emulate read access */
  46 static unsigned __wd_ena_pio_portval = 0;
  47 #endif
  48
  49 #define WD_PIO_INIT_DONE(V)     ((V) & (1 << CONFIG_HW_WDENA_BIT))
  50
  51 void ssv_wd_pio_init(void)
  52 {
  53         nios_pio_t *ena_piop     = (nios_pio_t*)CONFIG_HW_WDENA_BASE;
  54         nios_pio_t *trg_piop     = (nios_pio_t*)CONFIG_HW_WDTOG_BASE;
  55
  56         trg_piop->data          &= ~(1 << CONFIG_HW_WDTOG_BIT);
  57
  58 #ifdef  CONFIG_HW_WDPORT_WRONLY /* emulate read access */
  59
  60         __wd_ena_pio_portval    |= (1 << CONFIG_HW_WDENA_BIT);
  61         ena_piop->data           = __wd_ena_pio_portval;
  62
  63 #else   /* !CONFIG_HW_WDPORT_WRONLY */
  64
  65         trg_piop->direction     |= (1 << CONFIG_HW_WDTOG_BIT);
  66
  67         ena_piop->data          |= (1 << CONFIG_HW_WDENA_BIT);
  68         ena_piop->direction     |= (1 << CONFIG_HW_WDENA_BIT);
  69
  70 #endif  /* CONFIG_HW_WDPORT_WRONLY */
  71 }
  72
  73 void ssv_wd_pio_done(void)
  74 {
  75         nios_pio_t *piop         = (nios_pio_t*)CONFIG_HW_WDENA_BASE;
  76
  77 #ifdef  CONFIG_HW_WDPORT_WRONLY /* emulate read access */
  78
  79         __wd_ena_pio_portval    &= ~(1 << CONFIG_HW_WDENA_BIT);
  80         piop->data               = __wd_ena_pio_portval;
  81
  82 #else   /* !CONFIG_HW_WDPORT_WRONLY */
  83
  84         piop->data              &= ~(1 << CONFIG_HW_WDENA_BIT);
  85
  86 #endif  /* CONFIG_HW_WDPORT_WRONLY */
  87 }
  88
  89 void ssv_wd_pio_reset(void)
  90 {
  91         nios_pio_t *trg_piop     = (nios_pio_t*)CONFIG_HW_WDTOG_BASE;
  92
  93 #ifdef  CONFIG_HW_WDPORT_WRONLY
  94         if (WD_PIO_INIT_DONE(__wd_ena_pio_portval))
  95 #else
  96         nios_pio_t *ena_piop     = (nios_pio_t*)CONFIG_HW_WDENA_BASE;
  97
  98         if (WD_PIO_INIT_DONE(ena_piop->data))
  99 #endif
 100         {
 101                 trg_piop->data  |=  (1 << CONFIG_HW_WDTOG_BIT);
 102                 trg_piop->data  &= ~(1 << CONFIG_HW_WDTOG_BIT);
 103         }
 104 }
 105
 106 void hw_watchdog_reset(void)
 107 {
 108         int re_enable = disable_interrupts ();
 109
 110         ssv_wd_pio_reset();
 111         if (re_enable)
 112                 enable_interrupts ();
 113 }
 114
 115 #if defined(CONFIG_CMD_BSP)
 116 int do_wd (cmd_tbl_t *cmdtp, int flag, int argc, char *argv[])
 117 {
 118         nios_pio_t *ena_piop     = (nios_pio_t*)CONFIG_HW_WDENA_BASE;
 119
 120         switch (argc)
 121         {
 122         case 1:
 123                 printf ("Watchdog timer status is %s\n",
 124 #ifdef  CONFIG_HW_WDPORT_WRONLY
 125                                 WD_PIO_INIT_DONE(__wd_ena_pio_portval)
 126 #else
 127                                 WD_PIO_INIT_DONE(ena_piop->data)
 128 #endif
 129                                 ? "on" : "off");
 130                 return 0;
 131         case 2:
 132                 if (!strcmp(argv[1],"on"))
 133                 {
 134                         ssv_wd_pio_init();
 135                         printf("Watchdog timer now is on\n");
 136                         return 0;
 137                 }
 138                 else if (!strcmp(argv[1],"off"))
 139                 {
 140                         ssv_wd_pio_done();
 141                         printf("Watchdog timer now is off\n");
 142                         return 0;
 143                 }
 144                 break;
 145         default:
 146                 break;
 147         }
 148         printf ("Usage:\n%s\n", cmdtp->usage);
 149         return 1;
 150 }
 151
 152 U_BOOT_CMD(
 153         wd,     2,      1,      do_wd,
 154         "wd      - check and set watchdog\n",
 155         "on   - switch watchDog on\n"
 156         "wd off  - switch watchdog off\n"
 157         "wd      - print current status\n"
 158 );
 159 #endif
 160 #endif  /* CONFIG_HW_WATCHDOG */