lib_avr32/avr32_linux.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 extern int do_reset(cmd_tbl_t *cmdtp, int flag, int argc, char *argv[]);
  35
  36 /* CPU-specific hook to allow flushing of caches, etc. */
  37 extern void prepare_to_boot(void);
  38
  39 extern image_header_t header;           /* from cmd_bootm.c */
  40
  41 static struct tag *setup_start_tag(struct tag *params)
  42 {
  43         params->hdr.tag = ATAG_CORE;
  44         params->hdr.size = tag_size(tag_core);
  45
  46         params->u.core.flags = 0;
  47         params->u.core.pagesize = 4096;
  48         params->u.core.rootdev = 0;
  49
  50         return tag_next(params);
  51 }
  52
  53 static struct tag *setup_memory_tags(struct tag *params)
  54 {
  55         bd_t *bd = gd->bd;
  56         int i;
  57
  58         for (i = 0; i < CONFIG_NR_DRAM_BANKS; i++) {
  59                 params->hdr.tag = ATAG_MEM;
  60                 params->hdr.size = tag_size(tag_mem_range);
  61
  62                 params->u.mem_range.addr = bd->bi_dram[i].start;
  63                 params->u.mem_range.size = bd->bi_dram[i].size;
  64
  65                 params = tag_next(params);
  66         }
  67
  68         return params;
  69 }
  70
  71 static struct tag *setup_commandline_tag(struct tag *params, char *cmdline)
  72 {
  73         if (!cmdline)
  74                 return params;
  75
  76         /* eat leading white space */
  77         while (*cmdline == ' ') cmdline++;
  78
  79         /*
  80          * Don't include tags for empty command lines; let the kernel
  81          * use its default command line.
  82          */
  83         if (*cmdline == '\0')
  84                 return params;
  85
  86         params->hdr.tag = ATAG_CMDLINE;
  87         params->hdr.size =
  88                 (sizeof (struct tag_header) + strlen(cmdline) + 1 + 3) >> 2;
  89         strcpy(params->u.cmdline.cmdline, cmdline);
  90
  91         return tag_next(params);
  92 }
  93
  94 static struct tag *setup_ramdisk_tag(struct tag *params,
  95                                      unsigned long rd_start,
  96                                      unsigned long rd_end)
  97 {
  98         if (rd_start == rd_end)
  99                 return params;
 100
 101         params->hdr.tag = ATAG_RDIMG;
 102         params->hdr.size = tag_size(tag_mem_range);
 103
 104         params->u.mem_range.addr = rd_start;
 105         params->u.mem_range.size = rd_end - rd_start;
 106
 107         return tag_next(params);
 108 }
 109
 110 static struct tag *setup_clock_tags(struct tag *params)
 111 {
 112         params->hdr.tag = ATAG_CLOCK;
 113         params->hdr.size = tag_size(tag_clock);
 114         params->u.clock.clock_id = ACLOCK_BOOTCPU;
 115         params->u.clock.clock_flags = 0;
 116         params->u.clock.clock_hz = gd->cpu_hz;
 117
 118 #ifdef CONFIG_AT32AP7000
 119         /*
 120          * New kernels don't need this, but we should be backwards
 121          * compatible for a while...
 122          */
 123         params = tag_next(params);
 124
 125         params->hdr.tag = ATAG_CLOCK;
 126         params->hdr.size = tag_size(tag_clock);
 127         params->u.clock.clock_id = ACLOCK_HSB;
 128         params->u.clock.clock_flags = 0;
 129         params->u.clock.clock_hz = get_hsb_clk_rate();
 130 #endif
 131
 132         return tag_next(params);
 133 }
 134
 135 static struct tag *setup_ethernet_tag(struct tag *params,
 136                                       char *addr, int index)
 137 {
 138         char *s, *e;
 139         int i;
 140
 141         params->hdr.tag = ATAG_ETHERNET;
 142         params->hdr.size = tag_size(tag_ethernet);
 143
 144         params->u.ethernet.mac_index = index;
 145         params->u.ethernet.mii_phy_addr = gd->bd->bi_phy_id[index];
 146
 147         s = addr;
 148         for (i = 0; i < 6; i++) {
 149                 params->u.ethernet.hw_address[i] = simple_strtoul(s, &e, 16);
 150                 s = e + 1;
 151         }
 152
 153         return tag_next(params);
 154 }
 155
 156 static struct tag *setup_ethernet_tags(struct tag *params)
 157 {
 158         char name[16] = "ethaddr";
 159         char *addr;
 160         int i = 0;
 161
 162         do {
 163                 addr = getenv(name);
 164                 if (addr)
 165                         params = setup_ethernet_tag(params, addr, i);
 166                 sprintf(name, "eth%daddr", ++i);
 167         } while (i < 4);
 168
 169         return params;
 170 }
 171
 172 static void setup_end_tag(struct tag *params)
 173 {
 174         params->hdr.tag = ATAG_NONE;
 175         params->hdr.size = 0;
 176 }
 177
 178 void do_bootm_linux(cmd_tbl_t *cmdtp, int flag, int argc, char *argv[],
 179                     unsigned long addr, unsigned long *len_ptr, int verify)
 180 {
 181         unsigned long data, len = 0;
 182         unsigned long initrd_start, initrd_end;
 183         unsigned long image_start, image_end;
 184         unsigned long checksum;
 185         void (*theKernel)(int magic, void *tagtable);
 186         image_header_t *hdr;
 187         struct tag *params, *params_start;
 188         char *commandline = getenv("bootargs");
 189
 190         hdr = (image_header_t *)addr;
 191         image_start = addr;
 192         image_end = addr + hdr->ih_size;
 193
 194         theKernel = (void *)ntohl(hdr->ih_ep);
 195
 196         /*
 197          * Check if there is an initrd image
 198          */
 199         if (argc >= 3) {
 200                 show_boot_progress (9);
 201
 202                 addr = simple_strtoul(argv[2], NULL, 16);
 203
 204                 printf("## Loading RAMDISK image at %08lx ...\n", addr);
 205
 206                 memcpy(&header, (char *)addr, sizeof(header));
 207                 hdr = &header;
 208
 209                 if (ntohl(hdr->ih_magic) != IH_MAGIC) {
 210                         puts("Bad Magic Number\n");
 211                         show_boot_progress (-10);
 212                         do_reset(cmdtp, flag, argc, argv);
 213                 }
 214
 215                 data = (unsigned long)hdr;
 216                 len = sizeof(*hdr);
 217                 checksum = ntohl(hdr->ih_hcrc);
 218                 hdr->ih_hcrc = 0;
 219
 220                 if (crc32(0, (unsigned char *)data, len) != checksum) {
 221                         puts("Bad Header Checksum\n");
 222                         show_boot_progress (-11);
 223                         do_reset(cmdtp, flag, argc, argv);
 224                 }
 225
 226                 show_boot_progress (10);
 227
 228                 print_image_hdr(hdr);
 229
 230                 data = addr + sizeof(header);
 231                 len = ntohl(hdr->ih_size);
 232
 233                 if (verify) {
 234                         unsigned long csum = 0;
 235
 236                         puts("   Verifying Checksum ... ");
 237                         csum = crc32(0, (unsigned char *)data, len);
 238                         if (csum != ntohl(hdr->ih_dcrc)) {
 239                                 puts("Bad Data CRC\n");
 240                                 show_boot_progress (-12);
 241                                 do_reset(cmdtp, flag, argc, argv);
 242                         }
 243                         puts("OK\n");
 244                 }
 245
 246                 show_boot_progress (11);
 247
 248                 if ((hdr->ih_os != IH_OS_LINUX) ||
 249                     (hdr->ih_arch != IH_CPU_AVR32) ||
 250                     (hdr->ih_type != IH_TYPE_RAMDISK)) {
 251                         puts("Not a Linux/AVR32 RAMDISK image\n");
 252                         show_boot_progress (-13);
 253                         do_reset(cmdtp, flag, argc, argv);
 254                 }
 255         } else if ((hdr->ih_type == IH_TYPE_MULTI) && (len_ptr[1])) {
 256                 ulong tail = ntohl (len_ptr[0]) % 4;
 257                 int i;
 258
 259                 show_boot_progress (13);
 260
 261                 /* skip kernel length and terminator */
 262                 data = (ulong) (&len_ptr[2]);
 263                 /* skip any additional image length fields */
 264                 for (i = 1; len_ptr[i]; ++i)
 265                         data += 4;
 266                 /* add kernel length, and align */
 267                 data += ntohl (len_ptr[0]);
 268                 if (tail) {
 269                         data += 4 - tail;
 270                 }
 271
 272                 len = ntohl (len_ptr[1]);
 273         } else {
 274                 /* no initrd image */
 275                 show_boot_progress (14);
 276                 len = data = 0;
 277         }
 278
 279         if (data) {
 280                 initrd_start = data;
 281                 initrd_end = initrd_start + len;
 282         } else {
 283                 initrd_start = 0;
 284                 initrd_end = 0;
 285         }
 286
 287         show_boot_progress (15);
 288
 289         params = params_start = (struct tag *)gd->bd->bi_boot_params;
 290         params = setup_start_tag(params);
 291         params = setup_memory_tags(params);
 292         if (initrd_start) {
 293                 params = setup_ramdisk_tag(params,
 294                                            PHYSADDR(initrd_start),
 295                                            PHYSADDR(initrd_end));
 296         }
 297         params = setup_commandline_tag(params, commandline);
 298         params = setup_clock_tags(params);
 299         params = setup_ethernet_tags(params);
 300         setup_end_tag(params);
 301
 302         printf("\nStarting kernel at %p (params at %p)...\n\n",
 303                theKernel, params_start);
 304
 305         prepare_to_boot();
 306
 307         theKernel(ATAG_MAGIC, params_start);
 308 }