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 <serial.h>
  30 #ifdef CONFIG_LOGBUFFER
  31 #include <logbuff.h>
  32 #endif
  33 #if defined(CONFIG_HARD_I2C) || defined(CONFIG_SOFT_I2C)
  34 #include <i2c.h>
  35 #endif
  36
  37 DECLARE_GLOBAL_DATA_PTR;
  38
  39 list_t devlist = 0;
  40 device_t *stdio_devices[] = { NULL, NULL, NULL };
  41 char *stdio_names[MAX_FILES] = { "stdin", "stdout", "stderr" };
  42
  43 #if defined(CONFIG_SPLASH_SCREEN) && !defined(CFG_DEVICE_NULLDEV)
  44 #define CFG_DEVICE_NULLDEV      1
  45 #endif
  46
  47
  48 #ifdef CFG_DEVICE_NULLDEV
  49 void nulldev_putc(const char c)
  50 {
  51   /* nulldev is empty! */
  52 }
  53
  54 void nulldev_puts(const char *s)
  55 {
  56   /* nulldev is empty! */
  57 }
  58
  59 int nulldev_input(void)
  60 {
  61   /* nulldev is empty! */
  62   return 0;
  63 }
  64 #endif
  65
  66 /**************************************************************************
  67  * SYSTEM DRIVERS
  68  **************************************************************************
  69  */
  70
  71 static void drv_system_init (void)
  72 {
  73         device_t dev;
  74
  75         memset (&dev, 0, sizeof (dev));
  76
  77         strcpy (dev.name, "serial");
  78         dev.flags = DEV_FLAGS_OUTPUT | DEV_FLAGS_INPUT | DEV_FLAGS_SYSTEM;
  79 #ifdef CONFIG_SERIAL_SOFTWARE_FIFO
  80         dev.putc = serial_buffered_putc;
  81         dev.puts = serial_buffered_puts;
  82         dev.getc = serial_buffered_getc;
  83         dev.tstc = serial_buffered_tstc;
  84 #else
  85         dev.putc = serial_putc;
  86         dev.puts = serial_puts;
  87         dev.getc = serial_getc;
  88         dev.tstc = serial_tstc;
  89 #endif
  90
  91         device_register (&dev);
  92
  93 #ifdef CFG_DEVICE_NULLDEV
  94         memset (&dev, 0, sizeof (dev));
  95
  96         strcpy (dev.name, "nulldev");
  97         dev.flags = DEV_FLAGS_OUTPUT | DEV_FLAGS_INPUT | DEV_FLAGS_SYSTEM;
  98         dev.putc = nulldev_putc;
  99         dev.puts = nulldev_puts;
 100         dev.getc = nulldev_input;
 101         dev.tstc = nulldev_input;
 102
 103         device_register (&dev);
 104 #endif
 105 }
 106
 107 /**************************************************************************
 108  * DEVICES
 109  **************************************************************************
 110  */
 111
 112 int device_register (device_t * dev)
 113 {
 114         ListInsertItem (devlist, dev, LIST_END);
 115         return 0;
 116 }
 117
 118 /* deregister the device "devname".
 119  * returns 0 if success, -1 if device is assigned and 1 if devname not found
 120  */
 121 #ifdef  CFG_DEVICE_DEREGISTER
 122 int device_deregister(char *devname)
 123 {
 124         int i,l,dev_index;
 125         device_t *dev = NULL;
 126         char temp_names[3][8];
 127
 128         dev_index=-1;
 129         for (i=1; i<=ListNumItems(devlist); i++) {
 130                 dev = ListGetPtrToItem (devlist, i);
 131                 if(strcmp(dev->name,devname)==0) {
 132                         dev_index=i;
 133                         break;
 134                 }
 135         }
 136         if(dev_index<0) /* device not found */
 137                 return 0;
 138         /* get stdio devices (ListRemoveItem changes the dev list) */
 139         for (l=0 ; l< MAX_FILES; l++) {
 140                 if (stdio_devices[l] == dev) {
 141                         /* Device is assigned -> report error */
 142                         return -1;
 143                 }
 144                 memcpy (&temp_names[l][0],
 145                         stdio_devices[l]->name,
 146                         sizeof(stdio_devices[l]->name));
 147         }
 148         ListRemoveItem(devlist,NULL,dev_index);
 149         /* reassign Device list */
 150         for (i=1; i<=ListNumItems(devlist); i++) {
 151                 dev = ListGetPtrToItem (devlist, i);
 152                 for (l=0 ; l< MAX_FILES; l++) {
 153                         if(strcmp(dev->name,temp_names[l])==0) {
 154                                 stdio_devices[l] = dev;
 155                         }
 156                 }
 157         }
 158         return 0;
 159 }
 160 #endif  /* CFG_DEVICE_DEREGISTER */
 161
 162 int devices_init (void)
 163 {
 164 #ifndef CONFIG_ARM     /* already relocated for current ARM implementation */
 165         ulong relocation_offset = gd->reloc_off;
 166         int i;
 167
 168         /* relocate device name pointers */
 169         for (i = 0; i < (sizeof (stdio_names) / sizeof (char *)); ++i) {
 170                 stdio_names[i] = (char *) (((ulong) stdio_names[i]) +
 171                                                 relocation_offset);
 172         }
 173 #endif
 174
 175         /* Initialize the list */
 176         devlist = ListCreate (sizeof (device_t));
 177
 178         if (devlist == NULL) {
 179                 eputs ("Cannot initialize the list of devices!\n");
 180                 return -1;
 181         }
 182 #if defined(CONFIG_HARD_I2C) || defined(CONFIG_SOFT_I2C)
 183         i2c_init (CFG_I2C_SPEED, CFG_I2C_SLAVE);
 184 #endif
 185 #ifdef CONFIG_LCD
 186         drv_lcd_init ();
 187 #endif
 188 #if defined(CONFIG_VIDEO) || defined(CONFIG_CFB_CONSOLE)
 189         drv_video_init ();
 190 #endif
 191 #ifdef CONFIG_KEYBOARD
 192         drv_keyboard_init ();
 193 #endif
 194 #ifdef CONFIG_LOGBUFFER
 195         drv_logbuff_init ();
 196 #endif
 197         drv_system_init ();
 198 #ifdef CONFIG_SERIAL_MULTI
 199         serial_devices_init ();
 200 #endif
 201 #ifdef CONFIG_USB_TTY
 202         drv_usbtty_init ();
 203 #endif
 204 #ifdef CONFIG_NETCONSOLE
 205         drv_nc_init ();
 206 #endif
 207         return (0);
 208 }
 209
 210 int devices_done (void)
 211 {
 212         ListDispose (devlist);
 213
 214         return 0;
 215 }