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
  24 #include <config.h>
  25 #include <common.h>
  26 #include <stdarg.h>
  27 #include <malloc.h>
  28 #include <devices.h>
  29 #include <i2c.h>
  30
  31 list_t devlist = 0;
  32 device_t *stdio_devices[] = { NULL, NULL, NULL };
  33 char *stdio_names[MAX_FILES] = { "stdin", "stdout", "stderr" };
  34
  35 #ifdef CFG_DEVICE_NULLDEV
  36 void nulldev_putc(const char c)
  37 {
  38   /* nulldev is empty! */
  39 }
  40
  41 void nulldev_puts(const char *s)
  42 {
  43   /* nulldev is empty! */
  44 }
  45
  46 int nulldev_input(void)
  47 {
  48   /* nulldev is empty! */
  49   return 0;
  50 }
  51 #endif
  52
  53 /**************************************************************************
  54  * SYSTEM DRIVERS
  55  **************************************************************************
  56  */
  57
  58 static void drv_system_init (void)
  59 {
  60         device_t dev;
  61
  62         memset (&dev, 0, sizeof (dev));
  63
  64         strcpy (dev.name, "serial");
  65         dev.flags = DEV_FLAGS_OUTPUT | DEV_FLAGS_INPUT | DEV_FLAGS_SYSTEM;
  66 #if CONFIG_SERIAL_SOFTWARE_FIFO
  67         dev.putc = serial_buffered_putc;
  68         dev.puts = serial_buffered_puts;
  69         dev.getc = serial_buffered_getc;
  70         dev.tstc = serial_buffered_tstc;
  71 #else
  72         dev.putc = serial_putc;
  73         dev.puts = serial_puts;
  74         dev.getc = serial_getc;
  75         dev.tstc = serial_tstc;
  76 #endif
  77
  78         device_register (&dev);
  79
  80 #ifdef CFG_DEVICE_NULLDEV
  81         memset (&dev, 0, sizeof (dev));
  82
  83         strcpy (dev.name, "nulldev");
  84         dev.flags = DEV_FLAGS_OUTPUT | DEV_FLAGS_INPUT | DEV_FLAGS_SYSTEM;
  85         dev.putc = nulldev_putc;
  86         dev.puts = nulldev_puts;
  87         dev.getc = nulldev_input;
  88         dev.tstc = nulldev_input;
  89
  90         device_register (&dev);
  91 #endif
  92 }
  93
  94 /**************************************************************************
  95  * DEVICES
  96  **************************************************************************
  97  */
  98
  99 int device_register (device_t * dev)
 100 {
 101         ListInsertItem (devlist, dev, LIST_END);
 102         return 0;
 103 }
 104
 105 /* deregister the device "devname".
 106  * returns 0 if success, -1 if device is assigned and 1 if devname not found
 107  */
 108 #ifdef  CFG_DEVICE_DEREGISTER
 109 int device_deregister(char *devname)
 110 {
 111         int i,l,dev_index;
 112         device_t *dev = NULL;
 113         char temp_names[3][8];
 114
 115         dev_index=-1;
 116         for (i=1; i<=ListNumItems(devlist); i++) {
 117                 dev = ListGetPtrToItem (devlist, i);
 118                 if(strcmp(dev->name,devname)==0) {
 119                         dev_index=i;
 120                         break;
 121                 }
 122         }
 123         if(dev_index<0) /* device not found */
 124                 return 0;
 125         /* get stdio devices (ListRemoveItem changes the dev list) */
 126         for (l=0 ; l< MAX_FILES; l++) {
 127                 if (stdio_devices[l] == dev) {
 128                         /* Device is assigned -> report error */
 129                         return -1;
 130                 }
 131                 memcpy (&temp_names[l][0],
 132                         stdio_devices[l]->name,
 133                         sizeof(stdio_devices[l]->name));
 134         }
 135         ListRemoveItem(devlist,NULL,dev_index);
 136         /* reassign Device list */
 137         for (i=1; i<=ListNumItems(devlist); i++) {
 138                 dev = ListGetPtrToItem (devlist, i);
 139                 for (l=0 ; l< MAX_FILES; l++) {
 140                         if(strcmp(dev->name,temp_names[l])==0) {
 141                                 stdio_devices[l] = dev;
 142                         }
 143                 }
 144         }
 145         return 0;
 146 }
 147 #endif  /* CFG_DEVICE_DEREGISTER */
 148
 149 int devices_init (void)
 150 {
 151         DECLARE_GLOBAL_DATA_PTR;
 152
 153         int i;
 154         ulong relocation_offset = gd->reloc_off;
 155
 156         /* relocate device name pointers */
 157         for (i = 0; i < (sizeof (stdio_names) / sizeof (char *)); ++i) {
 158                 stdio_names[i] = (char *) (((ulong) stdio_names[i]) +
 159                                                 relocation_offset);
 160         }
 161
 162         /* Initialize the list */
 163         devlist = ListCreate (sizeof (device_t));
 164
 165         if (devlist == NULL) {
 166                 eputs ("Cannot initialize the list of devices!\n");
 167                 return -1;
 168         }
 169 #if defined(CONFIG_HARD_I2C) || defined(CONFIG_SOFT_I2C)
 170         i2c_init (CFG_I2C_SPEED, CFG_I2C_SLAVE);
 171 #endif
 172 #ifdef CONFIG_LCD
 173         drv_lcd_init ();
 174 #endif
 175 #ifdef CONFIG_VIDEO
 176         drv_video_init ();
 177 #endif
 178 #ifdef CONFIG_WL_4PPM_KEYBOARD
 179         drv_wlkbd_init ();
 180 #endif
 181 #ifdef CONFIG_LOGBUFFER
 182         drv_logbuff_init ();
 183 #endif
 184         drv_system_init ();
 185
 186         gd-> flags |= GD_FLG_DEVINIT;   /* device initialization done */
 187
 188         return (0);
 189 }
 190
 191 int devices_done (void)
 192 {
 193         ListDispose (devlist);
 194
 195         return 0;
 196 }