u-boot/common/devices.c

   1 /*
   2  * (C) Copyright 2000
   3  * Paolo Scaffardi, AIRVENT SAM s.p.a - RIMINI(ITALY), arsenio@tin.it
   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 #include <config.h>
  24 #include <common.h>
  25 #include <stdarg.h>
  26 #include <malloc.h>
  27 #include <devices.h>
  28 #include <serial.h>
  29
  30 DECLARE_GLOBAL_DATA_PTR;
  31
  32 list_t devlist = 0;
  33 device_t *stdio_devices[] = {NULL, NULL, NULL};
  34 char *stdio_names[MAX_FILES] = {"stdin", "stdout", "stderr"};
  35
  36 /**************************************************************************
  37  * SYSTEM DRIVERS
  38  **************************************************************************
  39  */
  40 static void drv_system_init(void){
  41         device_t dev;
  42
  43         memset(&dev, 0, sizeof(dev));
  44
  45         strcpy(dev.name, "serial");
  46         dev.flags = DEV_FLAGS_OUTPUT | DEV_FLAGS_INPUT | DEV_FLAGS_SYSTEM;
  47
  48         dev.putc = serial_putc;
  49         dev.puts = serial_puts;
  50         dev.getc = serial_getc;
  51         dev.tstc = serial_tstc;
  52
  53         device_register(&dev);
  54 }
  55
  56 /**************************************************************************
  57  * DEVICES
  58  **************************************************************************
  59  */
  60 int device_register(device_t * dev){
  61         ListInsertItem(devlist, dev, LIST_END);
  62         return(0);
  63 }
  64
  65 /*
  66  * deregister the device "devname".
  67  * returns 0 if success, -1 if device is assigned and 1 if devname not found
  68  */
  69 #ifdef  CFG_DEVICE_DEREGISTER
  70 int device_deregister(char *devname){
  71         int i,l,dev_index;
  72         device_t *dev = NULL;
  73         char temp_names[3][8];
  74
  75         dev_index=-1;
  76
  77         for(i=1; i<=ListNumItems(devlist); i++){
  78                 dev = ListGetPtrToItem(devlist, i);
  79
  80                 if(strcmp(dev->name,devname)==0){
  81                         dev_index=i;
  82                         break;
  83                 }
  84         }
  85
  86         if(dev_index<0){ /* device not found */
  87                 return(0);
  88         }
  89
  90         /* get stdio devices (ListRemoveItem changes the dev list) */
  91         for(l=0; l< MAX_FILES; l++){
  92                 if(stdio_devices[l] == dev){
  93                         /* Device is assigned -> report error */
  94                         return(-1);
  95                 }
  96                 memcpy(&temp_names[l][0], stdio_devices[l]->name, sizeof(stdio_devices[l]->name));
  97         }
  98
  99         ListRemoveItem(devlist,NULL,dev_index);
 100
 101         /* reassign Device list */
 102         for(i=1; i<=ListNumItems(devlist); i++){
 103                 dev = ListGetPtrToItem(devlist, i);
 104
 105                 for(l=0; l< MAX_FILES; l++){
 106                         if(strcmp(dev->name,temp_names[l])==0){
 107                                 stdio_devices[l] = dev;
 108                         }
 109                 }
 110         }
 111
 112         return(0);
 113 }
 114 #endif  /* CFG_DEVICE_DEREGISTER */
 115
 116 int devices_init(void){
 117         ulong relocation_offset = gd->reloc_off;
 118         int i;
 119
 120         /* relocate device name pointers */
 121         for(i = 0; i < (sizeof(stdio_names) / sizeof(char *)); ++i){
 122                 stdio_names[i] = (char *)(((ulong)stdio_names[i]) + relocation_offset);
 123         }
 124
 125         /* Initialize the list */
 126         devlist = ListCreate(sizeof(device_t));
 127
 128         if(devlist == NULL){
 129                 eputs("Cannot initialize the list of devices!\n");
 130                 return(-1);
 131         }
 132
 133         drv_system_init();
 134
 135 #ifdef CONFIG_NETCONSOLE
 136         drv_nc_init();
 137 #endif
 138
 139         return(0);
 140 }
 141
 142 int devices_done(void){
 143         ListDispose(devlist);
 144
 145         return(0);
 146 }