1/* 2 * Copyright (C) 2003 Josef Baumgartner <josef.baumgartner@telex.de> 3 * Based on code from Bernhard Kuhn <bkuhn@metrowerks.com> 4 * 5 * SPDX-License-Identifier: GPL-2.0+ 6 */ 7 8#include <asm-offsets.h> 9#include <config.h> 10#include "version.h" 11#include <asm/cache.h> 12 13#ifndef CONFIG_IDENT_STRING 14#define CONFIG_IDENT_STRING "" 15#endif 16 17#define _START _start 18#define _FAULT _fault 19 20 21#define SAVE_ALL \ 22 move.w #0x2700,%sr; /* disable intrs */ \ 23 subl #60,%sp; /* space for 15 regs */ \ 24 moveml %d0-%d7/%a0-%a6,%sp@; \ 25 26#define RESTORE_ALL \ 27 moveml %sp@,%d0-%d7/%a0-%a6; \ 28 addl #60,%sp; /* space for 15 regs */ \ 29 rte 30 31/* If we come from a pre-loader we don't need an initial exception 32 * table. 33 */ 34#if !defined(CONFIG_MONITOR_IS_IN_RAM) 35 36.text 37 38/* 39 * Vector table. This is used for initial platform startup. 40 * These vectors are to catch any un-intended traps. 41 */ 42_vectors: 43.long 0x00000000 /* Flash offset is 0 until we setup CS0 */ 44#if defined(CONFIG_M5282) && (CONFIG_SYS_TEXT_BASE == CONFIG_SYS_INT_FLASH_BASE) 45.long _start - CONFIG_SYS_TEXT_BASE 46#else 47.long _START 48#endif 49 50.long _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT 51.long _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT 52.long _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT 53.long _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT 54.long _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT 55.long _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT 56.long _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT 57.long _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT 58 59.long _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT 60.long _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT 61.long _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT 62.long _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT 63.long _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT 64.long _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT 65.long _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT 66.long _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT 67 68.long _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT 69.long _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT 70.long _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT 71.long _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT 72.long _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT 73.long _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT 74.long _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT 75.long _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT 76 77.long _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT 78.long _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT 79.long _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT 80.long _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT 81.long _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT 82.long _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT 83.long _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT 84.long _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT 85 86#endif 87 88.text 89 90#if defined(CONFIG_SYS_INT_FLASH_BASE) && \ 91 (defined(CONFIG_M5282) || defined(CONFIG_M5281)) 92#if (CONFIG_SYS_TEXT_BASE == CONFIG_SYS_INT_FLASH_BASE) 93.long 0x55AA55AA,0xAA55AA55 /* CFM Backdoorkey */ 94.long 0xFFFFFFFF /* all sectors protected */ 95.long 0x00000000 /* supervisor/User restriction */ 96.long 0x00000000 /* programm/data space restriction */ 97.long 0x00000000 /* Flash security */ 98#endif 99#endif 100 101.globl _start 102_start: 103 nop 104 nop 105 move.w #0x2700,%sr 106 107#if defined(CONFIG_M5208) 108 /* Initialize RAMBAR: locate SRAM and validate it */ 109 move.l #(CONFIG_SYS_INIT_RAM_ADDR + CONFIG_SYS_INIT_RAM_CTRL), %d0 110 movec %d0, %RAMBAR1 111#endif 112 113#if defined(CONFIG_M5272) || defined(CONFIG_M5249) || defined(CONFIG_M5253) 114 /* set MBAR address + valid flag */ 115 move.l #(CONFIG_SYS_MBAR + 1), %d0 116 move.c %d0, %MBAR 117 118 /*** The 5249 has MBAR2 as well ***/ 119#ifdef CONFIG_SYS_MBAR2 120 /* Get MBAR2 address */ 121 move.l #(CONFIG_SYS_MBAR2 + 1), %d0 122 /* Set MBAR2 */ 123 movec %d0, #0xc0e 124#endif 125 move.l #(CONFIG_SYS_INIT_RAM_ADDR + 1), %d0 126 movec %d0, %RAMBAR0 127#endif /* CONFIG_M5272 || CONFIG_M5249 || CONFIG_M5253 */ 128 129#if defined(CONFIG_M5282) || defined(CONFIG_M5271) 130 /* set MBAR address + valid flag */ 131 move.l #(CONFIG_SYS_MBAR + 1), %d0 132 move.l %d0, 0x40000000 133 134 /* Initialize RAMBAR1: locate SRAM and validate it */ 135 move.l #(CONFIG_SYS_INIT_RAM_ADDR + 0x21), %d0 136 movec %d0, %RAMBAR1 137 138#if defined(CONFIG_M5282) 139#if (CONFIG_SYS_TEXT_BASE == CONFIG_SYS_INT_FLASH_BASE) 140 /* 141 * Setup code in SRAM to initialize FLASHBAR, 142 * if start from internal Flash 143 */ 144 move.l #(_flashbar_setup-CONFIG_SYS_INT_FLASH_BASE), %a0 145 move.l #(_flashbar_setup_end-CONFIG_SYS_INT_FLASH_BASE), %a1 146 move.l #(CONFIG_SYS_INIT_RAM_ADDR), %a2 147_copy_flash: 148 move.l (%a0)+, (%a2)+ 149 cmp.l %a0, %a1 150 bgt.s _copy_flash 151 jmp CONFIG_SYS_INIT_RAM_ADDR 152 153_flashbar_setup: 154 /* Initialize FLASHBAR: locate internal Flash and validate it */ 155 move.l #(CONFIG_SYS_INT_FLASH_BASE + CONFIG_SYS_INT_FLASH_ENABLE), %d0 156 movec %d0, %FLASHBAR 157 jmp _after_flashbar_copy.L /* Force jump to absolute address */ 158_flashbar_setup_end: 159 nop 160_after_flashbar_copy: 161#else 162 /* Setup code to initialize FLASHBAR, if start from external Memory */ 163 move.l #(CONFIG_SYS_INT_FLASH_BASE + CONFIG_SYS_INT_FLASH_ENABLE), %d0 164 movec %d0, %FLASHBAR 165#endif /* (CONFIG_SYS_TEXT_BASE == CONFIG_SYS_INT_FLASH_BASE) */ 166 167#endif 168#endif 169 /* 170 * if we come from a pre-loader we have no exception table and 171 * therefore no VBR to set 172 */ 173#if !defined(CONFIG_MONITOR_IS_IN_RAM) 174#if defined(CONFIG_M5282) && (CONFIG_SYS_TEXT_BASE == CONFIG_SYS_INT_FLASH_BASE) 175 move.l #CONFIG_SYS_INT_FLASH_BASE, %d0 176#else 177 move.l #CONFIG_SYS_FLASH_BASE, %d0 178#endif 179 movec %d0, %VBR 180#endif 181 182#ifdef CONFIG_M5275 183 /* set MBAR address + valid flag */ 184 move.l #(CONFIG_SYS_MBAR + 1), %d0 185 move.l %d0, 0x40000000 186/* movec %d0, %MBAR */ 187 188 /* Initialize RAMBAR: locate SRAM and validate it */ 189 move.l #(CONFIG_SYS_INIT_RAM_ADDR + 0x21), %d0 190 movec %d0, %RAMBAR1 191#endif 192 193 /* initialize general use internal ram */ 194 move.l #0, %d0 195 move.l #(ICACHE_STATUS), %a1 /* icache */ 196 move.l #(DCACHE_STATUS), %a2 /* icache */ 197 move.l %d0, (%a1) 198 move.l %d0, (%a2) 199 200 /* put relocation table address to a5 */ 201 move.l #__got_start, %a5 202 203 /* setup stack initially on top of internal static ram */ 204 move.l #(CONFIG_SYS_INIT_RAM_ADDR + CONFIG_SYS_INIT_RAM_SIZE), %sp 205 206 /* 207 * if configured, malloc_f arena will be reserved first, 208 * then (and always) gd struct space will be reserved 209 */ 210 move.l %sp, -(%sp) 211 move.l #board_init_f_alloc_reserve, %a1 212 jsr (%a1) 213 214 /* update stack and frame-pointers */ 215 move.l %d0, %sp 216 move.l %sp, %fp 217 218 /* initialize reserved area */ 219 move.l %d0, -(%sp) 220 move.l #board_init_f_init_reserve, %a1 221 jsr (%a1) 222 223 /* run low-level CPU init code (from flash) */ 224 move.l #cpu_init_f, %a1 225 jsr (%a1) 226 227 /* run low-level board init code (from flash) */ 228 clr.l %sp@- 229 move.l #board_init_f, %a1 230 jsr (%a1) 231 232 /* board_init_f() does not return */ 233 234/******************************************************************************/ 235 236/* 237 * void relocate_code (addr_sp, gd, addr_moni) 238 * 239 * This "function" does not return, instead it continues in RAM 240 * after relocating the monitor code. 241 * 242 * r3 = dest 243 * r4 = src 244 * r5 = length in bytes 245 * r6 = cachelinesize 246 */ 247.globl relocate_code 248relocate_code: 249 link.w %a6,#0 250 move.l 8(%a6), %sp /* set new stack pointer */ 251 252 move.l 12(%a6), %d0 /* Save copy of Global Data pointer */ 253 move.l 16(%a6), %a0 /* Save copy of Destination Address */ 254 255 move.l #CONFIG_SYS_MONITOR_BASE, %a1 256 move.l #__init_end, %a2 257 move.l %a0, %a3 258 /* copy the code to RAM */ 2591: 260 move.l (%a1)+, (%a3)+ 261 cmp.l %a1,%a2 262 bgt.s 1b 263 264/* 265 * We are done. Do not return, instead branch to second part of board 266 * initialization, now running from RAM. 267 */ 268 move.l %a0, %a1 269 add.l #(in_ram - CONFIG_SYS_MONITOR_BASE), %a1 270 jmp (%a1) 271 272in_ram: 273 274clear_bss: 275 /* 276 * Now clear BSS segment 277 */ 278 move.l %a0, %a1 279 add.l #(_sbss - CONFIG_SYS_MONITOR_BASE),%a1 280 move.l %a0, %d1 281 add.l #(_ebss - CONFIG_SYS_MONITOR_BASE),%d1 2826: 283 clr.l (%a1)+ 284 cmp.l %a1,%d1 285 bgt.s 6b 286 287 /* 288 * fix got table in RAM 289 */ 290 move.l %a0, %a1 291 add.l #(__got_start - CONFIG_SYS_MONITOR_BASE),%a1 292 move.l %a1,%a5 /* fix got pointer register a5 */ 293 294 move.l %a0, %a2 295 add.l #(__got_end - CONFIG_SYS_MONITOR_BASE),%a2 296 2977: 298 move.l (%a1),%d1 299 sub.l #_start,%d1 300 add.l %a0,%d1 301 move.l %d1,(%a1)+ 302 cmp.l %a2, %a1 303 bne 7b 304 305 /* calculate relative jump to board_init_r in ram */ 306 move.l %a0, %a1 307 add.l #(board_init_r - CONFIG_SYS_MONITOR_BASE), %a1 308 309 /* set parameters for board_init_r */ 310 move.l %a0,-(%sp) /* dest_addr */ 311 move.l %d0,-(%sp) /* gd */ 312#if defined(DEBUG) && (CONFIG_SYS_TEXT_BASE != CONFIG_SYS_INT_FLASH_BASE) && \ 313 defined(CONFIG_SYS_HALT_BEFOR_RAM_JUMP) 314 halt 315#endif 316 jsr (%a1) 317 318/******************************************************************************/ 319 320/* exception code */ 321.globl _fault 322_fault: 323 bra _fault 324 325.globl _exc_handler 326_exc_handler: 327 SAVE_ALL 328 movel %sp,%sp@- 329 bsr exc_handler 330 addql #4,%sp 331 RESTORE_ALL 332 333.globl _int_handler 334_int_handler: 335 SAVE_ALL 336 movel %sp,%sp@- 337 bsr int_handler 338 addql #4,%sp 339 RESTORE_ALL 340 341/******************************************************************************/ 342 343.globl version_string 344version_string: 345.ascii U_BOOT_VERSION_STRING, "\0" 346.align 4 347