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 #ifdef CONFIG_LOGBUFFER
  30 #include <logbuff.h>
  31 #endif
  32 #if defined(CONFIG_HARD_I2C) || defined(CONFIG_SOFT_I2C)
  33 #include <i2c.h>
  34 #endif
  35
  36 list_t devlist = 0;
  37 device_t *stdio_devices[] = { NULL, NULL, NULL };
  38 char *stdio_names[MAX_FILES] = { "stdin", "stdout", "stderr" };
  39
  40 #if defined(CONFIG_SPLASH_SCREEN) && !defined(CFG_DEVICE_NULLDEV)
  41 #define CFG_DEVICE_NULLDEV      1
  42 #endif
  43
  44
  45 #ifdef CFG_DEVICE_NULLDEV
  46 void nulldev_putc(const char c)
  47 {
  48   /* nulldev is empty! */
  49 }
  50
  51 void nulldev_puts(const char *s)
  52 {
  53   /* nulldev is empty! */
  54 }
  55
  56 int nulldev_input(void)
  57 {
  58   /* nulldev is empty! */
  59   return 0;
  60 }
  61 #endif
  62
  63 /**************************************************************************
  64  * SYSTEM DRIVERS
  65  **************************************************************************
  66  */
  67
  68 static void drv_system_init (void)
  69 {
  70         device_t dev;
  71
  72         memset (&dev, 0, sizeof (dev));
  73
  74         strcpy (dev.name, "serial");
  75         dev.flags = DEV_FLAGS_OUTPUT | DEV_FLAGS_INPUT | DEV_FLAGS_SYSTEM;
  76 #if CONFIG_SERIAL_SOFTWARE_FIFO
  77         dev.putc = serial_buffered_putc;
  78         dev.puts = serial_buffered_puts;
  79         dev.getc = serial_buffered_getc;
  80         dev.tstc = serial_buffered_tstc;
  81 #else
  82         dev.putc = serial_putc;
  83         dev.puts = serial_puts;
  84         dev.getc = serial_getc;
  85         dev.tstc = serial_tstc;
  86 #endif
  87
  88         device_register (&dev);
  89
  90 #ifdef CFG_DEVICE_NULLDEV
  91         memset (&dev, 0, sizeof (dev));
  92
  93         strcpy (dev.name, "nulldev");
  94         dev.flags = DEV_FLAGS_OUTPUT | DEV_FLAGS_INPUT | DEV_FLAGS_SYSTEM;
  95         dev.putc = nulldev_putc;
  96         dev.puts = nulldev_puts;
  97         dev.getc = nulldev_input;
  98         dev.tstc = nulldev_input;
  99
 100         device_register (&dev);
 101 #endif
 102 }
 103
 104 /**************************************************************************
 105  * DEVICES
 106  **************************************************************************
 107  */
 108
 109 int device_register (device_t * dev)
 110 {
 111         ListInsertItem (devlist, dev, LIST_END);
 112         return 0;
 113 }
 114
 115 /* deregister the device "devname".
 116  * returns 0 if success, -1 if device is assigned and 1 if devname not found
 117  */
 118 #ifdef  CFG_DEVICE_DEREGISTER
 119 int device_deregister(char *devname)
 120 {
 121         int i,l,dev_index;
 122         device_t *dev = NULL;
 123         char temp_names[3][8];
 124
 125         dev_index=-1;
 126         for (i=1; i<=ListNumItems(devlist); i++) {
 127                 dev = ListGetPtrToItem (devlist, i);
 128                 if(strcmp(dev->name,devname)==0) {
 129                         dev_index=i;
 130                         break;
 131                 }
 132         }
 133         if(dev_index<0) /* device not found */
 134                 return 0;
 135         /* get stdio devices (ListRemoveItem changes the dev list) */
 136         for (l=0 ; l< MAX_FILES; l++) {
 137                 if (stdio_devices[l] == dev) {
 138                         /* Device is assigned -> report error */
 139                         return -1;
 140                 }
 141                 memcpy (&temp_names[l][0],
 142                         stdio_devices[l]->name,
 143                         sizeof(stdio_devices[l]->name));
 144         }
 145         ListRemoveItem(devlist,NULL,dev_index);
 146         /* reassign Device list */
 147         for (i=1; i<=ListNumItems(devlist); i++) {
 148                 dev = ListGetPtrToItem (devlist, i);
 149                 for (l=0 ; l< MAX_FILES; l++) {
 150                         if(strcmp(dev->name,temp_names[l])==0) {
 151                                 stdio_devices[l] = dev;
 152                         }
 153                 }
 154         }
 155         return 0;
 156 }
 157 #endif  /* CFG_DEVICE_DEREGISTER */
 158
 159 int devices_init (void)
 160 {
 161         DECLARE_GLOBAL_DATA_PTR;
 162
 163         int i;
 164         ulong relocation_offset = gd->reloc_off;
 165
 166         /* relocate device name pointers */
 167         for (i = 0; i < (sizeof (stdio_names) / sizeof (char *)); ++i) {
 168                 stdio_names[i] = (char *) (((ulong) stdio_names[i]) +
 169                                                 relocation_offset);
 170         }
 171
 172         /* Initialize the list */
 173         devlist = ListCreate (sizeof (device_t));
 174
 175         if (devlist == NULL) {
 176                 eputs ("Cannot initialize the list of devices!\n");
 177                 return -1;
 178         }
 179 #if defined(CONFIG_HARD_I2C) || defined(CONFIG_SOFT_I2C)
 180         i2c_init (CFG_I2C_SPEED, CFG_I2C_SLAVE);
 181 #endif
 182 #ifdef CONFIG_LCD
 183         drv_lcd_init ();
 184 #endif
 185 #if defined(CONFIG_VIDEO) || defined(CONFIG_CFB_CONSOLE)
 186         drv_video_init ();
 187 #endif
 188 #ifdef CONFIG_WL_4PPM_KEYBOARD
 189         drv_wlkbd_init ();
 190 #endif
 191 #ifdef CONFIG_LOGBUFFER
 192         drv_logbuff_init ();
 193 #endif
 194         drv_system_init ();
 195
 196         gd-> flags |= GD_FLG_DEVINIT;   /* device initialization done */
 197
 198         return (0);
 199 }
 200
 201 int devices_done (void)
 202 {
 203         ListDispose (devlist);
 204
 205         return 0;
 206 }