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 #if 0
  47 static void setup_ramdisk_tag (bd_t *bd);
  48 #endif
  49 # ifdef CONFIG_INITRD_TAG
  50 static void setup_initrd_tag (bd_t *bd, ulong initrd_start,
  51                               ulong initrd_end);
  52 # endif
  53 static void setup_end_tag (bd_t *bd);
  54
  55 # if defined (CONFIG_VFD) || defined (CONFIG_LCD)
  56 static void setup_videolfb_tag (gd_t *gd);
  57 # endif
  58
  59 static struct tag *params;
  60 #endif /* CONFIG_SETUP_MEMORY_TAGS || CONFIG_CMDLINE_TAG || CONFIG_INITRD_TAG */
  61
  62 extern int do_reset (cmd_tbl_t *cmdtp, int flag, int argc, char *argv[]);
  63
  64 void do_bootm_linux (cmd_tbl_t *cmdtp, int flag, int argc, char *argv[],
  65                      bootm_headers_t *images, int verify)
  66 {
  67         ulong   initrd_start, initrd_end;
  68         ulong   ep = 0;
  69         bd_t    *bd = gd->bd;
  70         char    *s;
  71         int     machid = bd->bi_arch_number;
  72         void    (*theKernel)(int zero, int arch, uint params);
  73
  74 #ifdef CONFIG_CMDLINE_TAG
  75         char *commandline = getenv ("bootargs");
  76 #endif
  77
  78         /* find kernel entry point */
  79         if (images->legacy_hdr_valid) {
  80                 ep = image_get_ep (images->legacy_hdr_os);
  81 #if defined(CONFIG_FIT)
  82         } else if (images->fit_uname_os) {
  83                 fit_unsupported_reset ("ARM linux bootm");
  84                 do_reset (cmdtp, flag, argc, argv);
  85 #endif
  86         } else {
  87                 puts ("Could not find kernel entry point!\n");
  88                 do_reset (cmdtp, flag, argc, argv);
  89         }
  90         theKernel = (void (*)(int, int, uint))ep;
  91
  92         s = getenv ("machid");
  93         if (s) {
  94                 machid = simple_strtoul (s, NULL, 16);
  95                 printf ("Using machid 0x%x from environment\n", machid);
  96         }
  97
  98         get_ramdisk (cmdtp, flag, argc, argv, images, verify,
  99                         IH_ARCH_ARM, &initrd_start, &initrd_end);
 100
 101         show_boot_progress (15);
 102
 103         debug ("## Transferring control to Linux (at address %08lx) ...\n",
 104                (ulong) theKernel);
 105
 106 #if defined (CONFIG_SETUP_MEMORY_TAGS) || \
 107     defined (CONFIG_CMDLINE_TAG) || \
 108     defined (CONFIG_INITRD_TAG) || \
 109     defined (CONFIG_SERIAL_TAG) || \
 110     defined (CONFIG_REVISION_TAG) || \
 111     defined (CONFIG_LCD) || \
 112     defined (CONFIG_VFD)
 113         setup_start_tag (bd);
 114 #ifdef CONFIG_SERIAL_TAG
 115         setup_serial_tag (&params);
 116 #endif
 117 #ifdef CONFIG_REVISION_TAG
 118         setup_revision_tag (&params);
 119 #endif
 120 #ifdef CONFIG_SETUP_MEMORY_TAGS
 121         setup_memory_tags (bd);
 122 #endif
 123 #ifdef CONFIG_CMDLINE_TAG
 124         setup_commandline_tag (bd, commandline);
 125 #endif
 126 #ifdef CONFIG_INITRD_TAG
 127         if (initrd_start && initrd_end)
 128                 setup_initrd_tag (bd, initrd_start, initrd_end);
 129 #endif
 130 #if defined (CONFIG_VFD) || defined (CONFIG_LCD)
 131         setup_videolfb_tag ((gd_t *) gd);
 132 #endif
 133         setup_end_tag (bd);
 134 #endif
 135
 136         /* we assume that the kernel is in place */
 137         printf ("\nStarting kernel ...\n\n");
 138
 139 #ifdef CONFIG_USB_DEVICE
 140         {
 141                 extern void udc_disconnect (void);
 142                 udc_disconnect ();
 143         }
 144 #endif
 145
 146         cleanup_before_linux ();
 147
 148         theKernel (0, machid, bd->bi_boot_params);
 149 }
 150
 151
 152 #if defined (CONFIG_SETUP_MEMORY_TAGS) || \
 153     defined (CONFIG_CMDLINE_TAG) || \
 154     defined (CONFIG_INITRD_TAG) || \
 155     defined (CONFIG_SERIAL_TAG) || \
 156     defined (CONFIG_REVISION_TAG) || \
 157     defined (CONFIG_LCD) || \
 158     defined (CONFIG_VFD)
 159 static void setup_start_tag (bd_t *bd)
 160 {
 161         params = (struct tag *) bd->bi_boot_params;
 162
 163         params->hdr.tag = ATAG_CORE;
 164         params->hdr.size = tag_size (tag_core);
 165
 166         params->u.core.flags = 0;
 167         params->u.core.pagesize = 0;
 168         params->u.core.rootdev = 0;
 169
 170         params = tag_next (params);
 171 }
 172
 173
 174 #ifdef CONFIG_SETUP_MEMORY_TAGS
 175 static void setup_memory_tags (bd_t *bd)
 176 {
 177         int i;
 178
 179         for (i = 0; i < CONFIG_NR_DRAM_BANKS; i++) {
 180                 params->hdr.tag = ATAG_MEM;
 181                 params->hdr.size = tag_size (tag_mem32);
 182
 183                 params->u.mem.start = bd->bi_dram[i].start;
 184                 params->u.mem.size = bd->bi_dram[i].size;
 185
 186                 params = tag_next (params);
 187         }
 188 }
 189 #endif /* CONFIG_SETUP_MEMORY_TAGS */
 190
 191
 192 static void setup_commandline_tag (bd_t *bd, char *commandline)
 193 {
 194         char *p;
 195
 196         if (!commandline)
 197                 return;
 198
 199         /* eat leading white space */
 200         for (p = commandline; *p == ' '; p++);
 201
 202         /* skip non-existent command lines so the kernel will still
 203          * use its default command line.
 204          */
 205         if (*p == '\0')
 206                 return;
 207
 208         params->hdr.tag = ATAG_CMDLINE;
 209         params->hdr.size =
 210                 (sizeof (struct tag_header) + strlen (p) + 1 + 4) >> 2;
 211
 212         strcpy (params->u.cmdline.cmdline, p);
 213
 214         params = tag_next (params);
 215 }
 216
 217
 218 #ifdef CONFIG_INITRD_TAG
 219 static void setup_initrd_tag (bd_t *bd, ulong initrd_start, ulong initrd_end)
 220 {
 221         /* an ATAG_INITRD node tells the kernel where the compressed
 222          * ramdisk can be found. ATAG_RDIMG is a better name, actually.
 223          */
 224         params->hdr.tag = ATAG_INITRD2;
 225         params->hdr.size = tag_size (tag_initrd);
 226
 227         params->u.initrd.start = initrd_start;
 228         params->u.initrd.size = initrd_end - initrd_start;
 229
 230         params = tag_next (params);
 231 }
 232 #endif /* CONFIG_INITRD_TAG */
 233
 234
 235 #if defined (CONFIG_VFD) || defined (CONFIG_LCD)
 236 extern ulong calc_fbsize (void);
 237 static void setup_videolfb_tag (gd_t *gd)
 238 {
 239         /* An ATAG_VIDEOLFB node tells the kernel where and how large
 240          * the framebuffer for video was allocated (among other things).
 241          * Note that a _physical_ address is passed !
 242          *
 243          * We only use it to pass the address and size, the other entries
 244          * in the tag_videolfb are not of interest.
 245          */
 246         params->hdr.tag = ATAG_VIDEOLFB;
 247         params->hdr.size = tag_size (tag_videolfb);
 248
 249         params->u.videolfb.lfb_base = (u32) gd->fb_base;
 250         /* Fb size is calculated according to parameters for our panel
 251          */
 252         params->u.videolfb.lfb_size = calc_fbsize();
 253
 254         params = tag_next (params);
 255 }
 256 #endif /* CONFIG_VFD || CONFIG_LCD */
 257
 258 #ifdef CONFIG_SERIAL_TAG
 259 void setup_serial_tag (struct tag **tmp)
 260 {
 261         struct tag *params = *tmp;
 262         struct tag_serialnr serialnr;
 263         void get_board_serial(struct tag_serialnr *serialnr);
 264
 265         get_board_serial(&serialnr);
 266         params->hdr.tag = ATAG_SERIAL;
 267         params->hdr.size = tag_size (tag_serialnr);
 268         params->u.serialnr.low = serialnr.low;
 269         params->u.serialnr.high= serialnr.high;
 270         params = tag_next (params);
 271         *tmp = params;
 272 }
 273 #endif
 274
 275 #ifdef CONFIG_REVISION_TAG
 276 void setup_revision_tag(struct tag **in_params)
 277 {
 278         u32 rev = 0;
 279         u32 get_board_rev(void);
 280
 281         rev = get_board_rev();
 282         params->hdr.tag = ATAG_REVISION;
 283         params->hdr.size = tag_size (tag_revision);
 284         params->u.revision.rev = rev;
 285         params = tag_next (params);
 286 }
 287 #endif  /* CONFIG_REVISION_TAG */
 288
 289
 290 static void setup_end_tag (bd_t *bd)
 291 {
 292         params->hdr.tag = ATAG_NONE;
 293         params->hdr.size = 0;
 294 }
 295
 296 #endif /* CONFIG_SETUP_MEMORY_TAGS || CONFIG_CMDLINE_TAG || CONFIG_INITRD_TAG */