lib_avr32/bootm.c

   1 /*
   2  * Copyright (C) 2004-2006 Atmel Corporation
   3  *
   4  * See file CREDITS for list of people who contributed to this
   5  * project.
   6  *
   7  * This program is free software; you can redistribute it and/or
   8  * modify it under the terms of the GNU General Public License as
   9  * published by the Free Software Foundation; either version 2 of
  10  * the License, or (at your option) any later version.
  11  *
  12  * This program is distributed in the hope that it will be useful,
  13  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  14  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15  * GNU General Public License for more details.
  16  *
  17  * You should have received a copy of the GNU General Public License
  18  * along with this program; if not, write to the Free Software
  19  * Foundation, Inc., 59 Temple Place, Suite 330, Boston,
  20  * MA 02111-1307 USA
  21  */
  22 #include <common.h>
  23 #include <command.h>
  24 #include <image.h>
  25 #include <zlib.h>
  26 #include <asm/byteorder.h>
  27 #include <asm/addrspace.h>
  28 #include <asm/io.h>
  29 #include <asm/setup.h>
  30 #include <asm/arch/clk.h>
  31
  32 DECLARE_GLOBAL_DATA_PTR;
  33
  34 /* CPU-specific hook to allow flushing of caches, etc. */
  35 extern void prepare_to_boot(void);
  36
  37 extern int do_reset (cmd_tbl_t *cmdtp, int flag, int argc, char *argv[]);
  38
  39 static struct tag *setup_start_tag(struct tag *params)
  40 {
  41         params->hdr.tag = ATAG_CORE;
  42         params->hdr.size = tag_size(tag_core);
  43
  44         params->u.core.flags = 0;
  45         params->u.core.pagesize = 4096;
  46         params->u.core.rootdev = 0;
  47
  48         return tag_next(params);
  49 }
  50
  51 static struct tag *setup_memory_tags(struct tag *params)
  52 {
  53         bd_t *bd = gd->bd;
  54         int i;
  55
  56         for (i = 0; i < CONFIG_NR_DRAM_BANKS; i++) {
  57                 params->hdr.tag = ATAG_MEM;
  58                 params->hdr.size = tag_size(tag_mem_range);
  59
  60                 params->u.mem_range.addr = bd->bi_dram[i].start;
  61                 params->u.mem_range.size = bd->bi_dram[i].size;
  62
  63                 params = tag_next(params);
  64         }
  65
  66         return params;
  67 }
  68
  69 static struct tag *setup_commandline_tag(struct tag *params, char *cmdline)
  70 {
  71         if (!cmdline)
  72                 return params;
  73
  74         /* eat leading white space */
  75         while (*cmdline == ' ') cmdline++;
  76
  77         /*
  78          * Don't include tags for empty command lines; let the kernel
  79          * use its default command line.
  80          */
  81         if (*cmdline == '\0')
  82                 return params;
  83
  84         params->hdr.tag = ATAG_CMDLINE;
  85         params->hdr.size =
  86                 (sizeof (struct tag_header) + strlen(cmdline) + 1 + 3) >> 2;
  87         strcpy(params->u.cmdline.cmdline, cmdline);
  88
  89         return tag_next(params);
  90 }
  91
  92 static struct tag *setup_ramdisk_tag(struct tag *params,
  93                                      unsigned long rd_start,
  94                                      unsigned long rd_end)
  95 {
  96         if (rd_start == rd_end)
  97                 return params;
  98
  99         params->hdr.tag = ATAG_RDIMG;
 100         params->hdr.size = tag_size(tag_mem_range);
 101
 102         params->u.mem_range.addr = rd_start;
 103         params->u.mem_range.size = rd_end - rd_start;
 104
 105         return tag_next(params);
 106 }
 107
 108 static struct tag *setup_clock_tags(struct tag *params)
 109 {
 110         params->hdr.tag = ATAG_CLOCK;
 111         params->hdr.size = tag_size(tag_clock);
 112         params->u.clock.clock_id = ACLOCK_BOOTCPU;
 113         params->u.clock.clock_flags = 0;
 114         params->u.clock.clock_hz = gd->cpu_hz;
 115
 116 #ifdef CONFIG_AT32AP7000
 117         /*
 118          * New kernels don't need this, but we should be backwards
 119          * compatible for a while...
 120          */
 121         params = tag_next(params);
 122
 123         params->hdr.tag = ATAG_CLOCK;
 124         params->hdr.size = tag_size(tag_clock);
 125         params->u.clock.clock_id = ACLOCK_HSB;
 126         params->u.clock.clock_flags = 0;
 127         params->u.clock.clock_hz = get_hsb_clk_rate();
 128 #endif
 129
 130         return tag_next(params);
 131 }
 132
 133 static struct tag *setup_ethernet_tag(struct tag *params,
 134                                       char *addr, int index)
 135 {
 136         char *s, *e;
 137         int i;
 138
 139         params->hdr.tag = ATAG_ETHERNET;
 140         params->hdr.size = tag_size(tag_ethernet);
 141
 142         params->u.ethernet.mac_index = index;
 143         params->u.ethernet.mii_phy_addr = gd->bd->bi_phy_id[index];
 144
 145         s = addr;
 146         for (i = 0; i < 6; i++) {
 147                 params->u.ethernet.hw_address[i] = simple_strtoul(s, &e, 16);
 148                 s = e + 1;
 149         }
 150
 151         return tag_next(params);
 152 }
 153
 154 static struct tag *setup_ethernet_tags(struct tag *params)
 155 {
 156         char name[16] = "ethaddr";
 157         char *addr;
 158         int i = 0;
 159
 160         do {
 161                 addr = getenv(name);
 162                 if (addr)
 163                         params = setup_ethernet_tag(params, addr, i);
 164                 sprintf(name, "eth%daddr", ++i);
 165         } while (i < 4);
 166
 167         return params;
 168 }
 169
 170 static void setup_end_tag(struct tag *params)
 171 {
 172         params->hdr.tag = ATAG_NONE;
 173         params->hdr.size = 0;
 174 }
 175
 176 void do_bootm_linux(cmd_tbl_t *cmdtp, int flag, int argc, char *argv[],
 177                     bootm_headers_t *images)
 178 {
 179         ulong   initrd_start, initrd_end;
 180         ulong   ep = 0;
 181         void    (*theKernel)(int magic, void *tagtable);
 182         struct  tag *params, *params_start;
 183         char    *commandline = getenv("bootargs");
 184         int     ret;
 185
 186         /* find kernel entry point */
 187         if (images->legacy_hdr_valid) {
 188                 ep = image_get_ep (images->legacy_hdr_os);
 189 #if defined(CONFIG_FIT)
 190         } else if (images->fit_uname_os) {
 191                 ret = fit_image_get_entry (images->fit_hdr_os,
 192                                 images->fit_noffset_os, &ep);
 193                 if (ret) {
 194                         puts ("Can't get entry point property!\n");
 195                         goto error;
 196                 }
 197 #endif
 198         } else {
 199                 puts ("Could not find kernel entry point!\n");
 200                 goto error;
 201         }
 202         theKernel = (void *)ep;
 203
 204         ret = boot_get_ramdisk (argc, argv, images, IH_ARCH_AVR32,
 205                         &initrd_start, &initrd_end);
 206         if (ret)
 207                 goto error;
 208
 209         show_boot_progress (15);
 210
 211         params = params_start = (struct tag *)gd->bd->bi_boot_params;
 212         params = setup_start_tag(params);
 213         params = setup_memory_tags(params);
 214         if (initrd_start) {
 215                 params = setup_ramdisk_tag(params,
 216                                            PHYSADDR(initrd_start),
 217                                            PHYSADDR(initrd_end));
 218         }
 219         params = setup_commandline_tag(params, commandline);
 220         params = setup_clock_tags(params);
 221         params = setup_ethernet_tags(params);
 222         setup_end_tag(params);
 223
 224         if (!images->autostart)
 225                 return ;
 226
 227         printf("\nStarting kernel at %p (params at %p)...\n\n",
 228                theKernel, params_start);
 229
 230         prepare_to_boot();
 231
 232         theKernel(ATAG_MAGIC, params_start);
 233         /* does not return */
 234         return;
 235
 236 error:
 237         if (images->autostart)
 238                 do_reset (cmdtp, flag, argc, argv);
 239         return;
 240 }