lib_arm/bootm.c

   1 /*
   2  * (C) Copyright 2002
   3  * Sysgo Real-Time Solutions, GmbH <www.elinos.com>
   4  * Marius Groeger <mgroeger@sysgo.de>
   5  *
   6  * Copyright (C) 2001  Erik Mouw (J.A.K.Mouw@its.tudelft.nl)
   7  *
   8  * This program is free software; you can redistribute it and/or modify
   9  * it under the terms of the GNU General Public License as published by
  10  * the Free Software Foundation; either version 2 of the License, or
  11  * (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, MA  02111-1307  USA
  21  *
  22  */
  23
  24 #include <common.h>
  25 #include <command.h>
  26 #include <image.h>
  27 #include <zlib.h>
  28 #include <asm/byteorder.h>
  29
  30 DECLARE_GLOBAL_DATA_PTR;
  31
  32 #if defined (CONFIG_SETUP_MEMORY_TAGS) || \
  33     defined (CONFIG_CMDLINE_TAG) || \
  34     defined (CONFIG_INITRD_TAG) || \
  35     defined (CONFIG_SERIAL_TAG) || \
  36     defined (CONFIG_REVISION_TAG) || \
  37     defined (CONFIG_VFD) || \
  38     defined (CONFIG_LCD)
  39 static void setup_start_tag (bd_t *bd);
  40
  41 # ifdef CONFIG_SETUP_MEMORY_TAGS
  42 static void setup_memory_tags (bd_t *bd);
  43 # endif
  44 static void setup_commandline_tag (bd_t *bd, char *commandline);
  45
  46 # ifdef CONFIG_INITRD_TAG
  47 static void setup_initrd_tag (bd_t *bd, ulong initrd_start,
  48                               ulong initrd_end);
  49 # endif
  50 static void setup_end_tag (bd_t *bd);
  51
  52 # if defined (CONFIG_VFD) || defined (CONFIG_LCD)
  53 static void setup_videolfb_tag (gd_t *gd);
  54 # endif
  55
  56 static struct tag *params;
  57 #endif /* CONFIG_SETUP_MEMORY_TAGS || CONFIG_CMDLINE_TAG || CONFIG_INITRD_TAG */
  58
  59 int do_bootm_linux(int flag, int argc, char *argv[], bootm_headers_t *images)
  60 {
  61         bd_t    *bd = gd->bd;
  62         char    *s;
  63         int     machid = bd->bi_arch_number;
  64         void    (*theKernel)(int zero, int arch, uint params);
  65
  66 #ifdef CONFIG_CMDLINE_TAG
  67         char *commandline = getenv ("bootargs");
  68 #endif
  69
  70         theKernel = (void (*)(int, int, uint))images->ep;
  71
  72         s = getenv ("machid");
  73         if (s) {
  74                 machid = simple_strtoul (s, NULL, 16);
  75                 printf ("Using machid 0x%x from environment\n", machid);
  76         }
  77
  78         show_boot_progress (15);
  79
  80         debug ("## Transferring control to Linux (at address %08lx) ...\n",
  81                (ulong) theKernel);
  82
  83 #if defined (CONFIG_SETUP_MEMORY_TAGS) || \
  84     defined (CONFIG_CMDLINE_TAG) || \
  85     defined (CONFIG_INITRD_TAG) || \
  86     defined (CONFIG_SERIAL_TAG) || \
  87     defined (CONFIG_REVISION_TAG) || \
  88     defined (CONFIG_LCD) || \
  89     defined (CONFIG_VFD)
  90         setup_start_tag (bd);
  91 #ifdef CONFIG_SERIAL_TAG
  92         setup_serial_tag (&params);
  93 #endif
  94 #ifdef CONFIG_REVISION_TAG
  95         setup_revision_tag (&params);
  96 #endif
  97 #ifdef CONFIG_SETUP_MEMORY_TAGS
  98         setup_memory_tags (bd);
  99 #endif
 100 #ifdef CONFIG_CMDLINE_TAG
 101         setup_commandline_tag (bd, commandline);
 102 #endif
 103 #ifdef CONFIG_INITRD_TAG
 104         if (images->rd_start && images->rd_end)
 105                 setup_initrd_tag (bd, images->rd_start, images->rd_end);
 106 #endif
 107 #if defined (CONFIG_VFD) || defined (CONFIG_LCD)
 108         setup_videolfb_tag ((gd_t *) gd);
 109 #endif
 110         setup_end_tag (bd);
 111 #endif
 112
 113         /* we assume that the kernel is in place */
 114         printf ("\nStarting kernel ...\n\n");
 115
 116 #ifdef CONFIG_USB_DEVICE
 117         {
 118                 extern void udc_disconnect (void);
 119                 udc_disconnect ();
 120         }
 121 #endif
 122
 123         cleanup_before_linux ();
 124
 125         theKernel (0, machid, bd->bi_boot_params);
 126         /* does not return */
 127
 128         return 1;
 129 }
 130
 131
 132 #if defined (CONFIG_SETUP_MEMORY_TAGS) || \
 133     defined (CONFIG_CMDLINE_TAG) || \
 134     defined (CONFIG_INITRD_TAG) || \
 135     defined (CONFIG_SERIAL_TAG) || \
 136     defined (CONFIG_REVISION_TAG) || \
 137     defined (CONFIG_LCD) || \
 138     defined (CONFIG_VFD)
 139 static void setup_start_tag (bd_t *bd)
 140 {
 141         params = (struct tag *) bd->bi_boot_params;
 142
 143         params->hdr.tag = ATAG_CORE;
 144         params->hdr.size = tag_size (tag_core);
 145
 146         params->u.core.flags = 0;
 147         params->u.core.pagesize = 0;
 148         params->u.core.rootdev = 0;
 149
 150         params = tag_next (params);
 151 }
 152
 153
 154 #ifdef CONFIG_SETUP_MEMORY_TAGS
 155 static void setup_memory_tags (bd_t *bd)
 156 {
 157         int i;
 158
 159         for (i = 0; i < CONFIG_NR_DRAM_BANKS; i++) {
 160                 params->hdr.tag = ATAG_MEM;
 161                 params->hdr.size = tag_size (tag_mem32);
 162
 163                 params->u.mem.start = bd->bi_dram[i].start;
 164                 params->u.mem.size = bd->bi_dram[i].size;
 165
 166                 params = tag_next (params);
 167         }
 168 }
 169 #endif /* CONFIG_SETUP_MEMORY_TAGS */
 170
 171
 172 static void setup_commandline_tag (bd_t *bd, char *commandline)
 173 {
 174         char *p;
 175
 176         if (!commandline)
 177                 return;
 178
 179         /* eat leading white space */
 180         for (p = commandline; *p == ' '; p++);
 181
 182         /* skip non-existent command lines so the kernel will still
 183          * use its default command line.
 184          */
 185         if (*p == '\0')
 186                 return;
 187
 188         params->hdr.tag = ATAG_CMDLINE;
 189         params->hdr.size =
 190                 (sizeof (struct tag_header) + strlen (p) + 1 + 4) >> 2;
 191
 192         strcpy (params->u.cmdline.cmdline, p);
 193
 194         params = tag_next (params);
 195 }
 196
 197
 198 #ifdef CONFIG_INITRD_TAG
 199 static void setup_initrd_tag (bd_t *bd, ulong initrd_start, ulong initrd_end)
 200 {
 201         /* an ATAG_INITRD node tells the kernel where the compressed
 202          * ramdisk can be found. ATAG_RDIMG is a better name, actually.
 203          */
 204         params->hdr.tag = ATAG_INITRD2;
 205         params->hdr.size = tag_size (tag_initrd);
 206
 207         params->u.initrd.start = initrd_start;
 208         params->u.initrd.size = initrd_end - initrd_start;
 209
 210         params = tag_next (params);
 211 }
 212 #endif /* CONFIG_INITRD_TAG */
 213
 214
 215 #if defined (CONFIG_VFD) || defined (CONFIG_LCD)
 216 extern ulong calc_fbsize (void);
 217 static void setup_videolfb_tag (gd_t *gd)
 218 {
 219         /* An ATAG_VIDEOLFB node tells the kernel where and how large
 220          * the framebuffer for video was allocated (among other things).
 221          * Note that a _physical_ address is passed !
 222          *
 223          * We only use it to pass the address and size, the other entries
 224          * in the tag_videolfb are not of interest.
 225          */
 226         params->hdr.tag = ATAG_VIDEOLFB;
 227         params->hdr.size = tag_size (tag_videolfb);
 228
 229         params->u.videolfb.lfb_base = (u32) gd->fb_base;
 230         /* Fb size is calculated according to parameters for our panel
 231          */
 232         params->u.videolfb.lfb_size = calc_fbsize();
 233
 234         params = tag_next (params);
 235 }
 236 #endif /* CONFIG_VFD || CONFIG_LCD */
 237
 238 #ifdef CONFIG_SERIAL_TAG
 239 void setup_serial_tag (struct tag **tmp)
 240 {
 241         struct tag *params = *tmp;
 242         struct tag_serialnr serialnr;
 243         void get_board_serial(struct tag_serialnr *serialnr);
 244
 245         get_board_serial(&serialnr);
 246         params->hdr.tag = ATAG_SERIAL;
 247         params->hdr.size = tag_size (tag_serialnr);
 248         params->u.serialnr.low = serialnr.low;
 249         params->u.serialnr.high= serialnr.high;
 250         params = tag_next (params);
 251         *tmp = params;
 252 }
 253 #endif
 254
 255 #ifdef CONFIG_REVISION_TAG
 256 void setup_revision_tag(struct tag **in_params)
 257 {
 258         u32 rev = 0;
 259         u32 get_board_rev(void);
 260
 261         rev = get_board_rev();
 262         params->hdr.tag = ATAG_REVISION;
 263         params->hdr.size = tag_size (tag_revision);
 264         params->u.revision.rev = rev;
 265         params = tag_next (params);
 266 }
 267 #endif  /* CONFIG_REVISION_TAG */
 268
 269
 270 static void setup_end_tag (bd_t *bd)
 271 {
 272         params->hdr.tag = ATAG_NONE;
 273         params->hdr.size = 0;
 274 }
 275
 276 #endif /* CONFIG_SETUP_MEMORY_TAGS || CONFIG_CMDLINE_TAG || CONFIG_INITRD_TAG */