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 * Vector table. This is used for initial platform startup. 39 * These vectors are to catch any un-intended traps. 40 */ 41_vectors: 42 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 91#if defined(CONFIG_SYS_INT_FLASH_BASE) && \ 92 (defined(CONFIG_M5282) || defined(CONFIG_M5281)) 93 #if (CONFIG_SYS_TEXT_BASE == CONFIG_SYS_INT_FLASH_BASE) 94 .long 0x55AA55AA,0xAA55AA55 /* CFM Backdoorkey */ 95 .long 0xFFFFFFFF /* all sectors protected */ 96 .long 0x00000000 /* supervisor/User restriction */ 97 .long 0x00000000 /* programm/data space restriction */ 98 .long 0x00000000 /* Flash security */ 99 #endif 100#endif 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 move.l #(CONFIG_SYS_MBAR + 1), %d0 /* set MBAR address + valid flag */ 115 move.c %d0, %MBAR 116 117 /*** The 5249 has MBAR2 as well ***/ 118#ifdef CONFIG_SYS_MBAR2 119 move.l #(CONFIG_SYS_MBAR2 + 1), %d0 /* Get MBAR2 address */ 120 movec %d0, #0xc0e /* Set MBAR2 */ 121#endif 122 123 move.l #(CONFIG_SYS_INIT_RAM_ADDR + 1), %d0 124 movec %d0, %RAMBAR0 125#endif /* CONFIG_M5272 || CONFIG_M5249 || CONFIG_M5253 */ 126 127#if defined(CONFIG_M5282) || defined(CONFIG_M5271) 128 /* Initialize IPSBAR */ 129 move.l #(CONFIG_SYS_MBAR + 1), %d0 /* set IPSBAR address + valid flag */ 130 move.l %d0, 0x40000000 131 132 /* Initialize RAMBAR1: locate SRAM and validate it */ 133 move.l #(CONFIG_SYS_INIT_RAM_ADDR + 0x21), %d0 134 movec %d0, %RAMBAR1 135 136#if defined(CONFIG_M5282) 137#if (CONFIG_SYS_TEXT_BASE == CONFIG_SYS_INT_FLASH_BASE) 138 /* Setup code in SRAM to initialize FLASHBAR, if start from internal Flash */ 139 140 move.l #(_flashbar_setup-CONFIG_SYS_INT_FLASH_BASE), %a0 141 move.l #(_flashbar_setup_end-CONFIG_SYS_INT_FLASH_BASE), %a1 142 move.l #(CONFIG_SYS_INIT_RAM_ADDR), %a2 143_copy_flash: 144 move.l (%a0)+, (%a2)+ 145 cmp.l %a0, %a1 146 bgt.s _copy_flash 147 jmp CONFIG_SYS_INIT_RAM_ADDR 148 149_flashbar_setup: 150 /* Initialize FLASHBAR: locate internal Flash and validate it */ 151 move.l #(CONFIG_SYS_INT_FLASH_BASE + CONFIG_SYS_INT_FLASH_ENABLE), %d0 152 movec %d0, %FLASHBAR 153 jmp _after_flashbar_copy.L /* Force jump to absolute address */ 154_flashbar_setup_end: 155 nop 156_after_flashbar_copy: 157#else 158 /* Setup code to initialize FLASHBAR, if start from external Memory */ 159 move.l #(CONFIG_SYS_INT_FLASH_BASE + CONFIG_SYS_INT_FLASH_ENABLE), %d0 160 movec %d0, %FLASHBAR 161#endif /* (CONFIG_SYS_TEXT_BASE == CONFIG_SYS_INT_FLASH_BASE) */ 162 163#endif 164#endif 165 /* if we come from a pre-loader we have no exception table and 166 * therefore no VBR to set 167 */ 168#if !defined(CONFIG_MONITOR_IS_IN_RAM) 169#if defined(CONFIG_M5282) && (CONFIG_SYS_TEXT_BASE == CONFIG_SYS_INT_FLASH_BASE) 170 move.l #CONFIG_SYS_INT_FLASH_BASE, %d0 171#else 172 move.l #CONFIG_SYS_FLASH_BASE, %d0 173#endif 174 movec %d0, %VBR 175#endif 176 177#ifdef CONFIG_M5275 178 /* Initialize IPSBAR */ 179 move.l #(CONFIG_SYS_MBAR + 1), %d0 /* set IPSBAR address + valid flag */ 180 move.l %d0, 0x40000000 181/* movec %d0, %MBAR */ 182 183 /* Initialize RAMBAR: locate SRAM and validate it */ 184 move.l #(CONFIG_SYS_INIT_RAM_ADDR + 0x21), %d0 185 movec %d0, %RAMBAR1 186#endif 187 188 /* initialize general use internal ram */ 189 move.l #0, %d0 190 move.l #(ICACHE_STATUS), %a1 /* icache */ 191 move.l #(DCACHE_STATUS), %a2 /* icache */ 192 move.l %d0, (%a1) 193 move.l %d0, (%a2) 194 195 /* set stackpointer to end of internal ram to get some stackspace for the first c-code */ 196 move.l #(CONFIG_SYS_INIT_RAM_ADDR + CONFIG_SYS_INIT_SP_OFFSET), %sp 197 clr.l %sp@- 198 199 move.l #__got_start, %a5 /* put relocation table address to a5 */ 200 201 /* run low-level CPU init code (from flash) */ 202 move.l #cpu_init_f, %a1 203 jsr (%a1) 204 /* run low-level board init code (from flash) */ 205 move.l #board_init_f, %a1 206 jsr (%a1) 207 208 /* board_init_f() does not return */ 209 210/*------------------------------------------------------------------------------*/ 211 212/* 213 * void relocate_code (addr_sp, gd, addr_moni) 214 * 215 * This "function" does not return, instead it continues in RAM 216 * after relocating the monitor code. 217 * 218 * r3 = dest 219 * r4 = src 220 * r5 = length in bytes 221 * r6 = cachelinesize 222 */ 223 .globl relocate_code 224relocate_code: 225 link.w %a6,#0 226 move.l 8(%a6), %sp /* set new stack pointer */ 227 228 move.l 12(%a6), %d0 /* Save copy of Global Data pointer */ 229 move.l 16(%a6), %a0 /* Save copy of Destination Address */ 230 231 move.l #CONFIG_SYS_MONITOR_BASE, %a1 232 move.l #__init_end, %a2 233 move.l %a0, %a3 234 /* copy the code to RAM */ 2351: 236 move.l (%a1)+, (%a3)+ 237 cmp.l %a1,%a2 238 bgt.s 1b 239 240/* 241 * We are done. Do not return, instead branch to second part of board 242 * initialization, now running from RAM. 243 */ 244 move.l %a0, %a1 245 add.l #(in_ram - CONFIG_SYS_MONITOR_BASE), %a1 246 jmp (%a1) 247 248in_ram: 249 250clear_bss: 251 /* 252 * Now clear BSS segment 253 */ 254 move.l %a0, %a1 255 add.l #(_sbss - CONFIG_SYS_MONITOR_BASE),%a1 256 move.l %a0, %d1 257 add.l #(_ebss - CONFIG_SYS_MONITOR_BASE),%d1 2586: 259 clr.l (%a1)+ 260 cmp.l %a1,%d1 261 bgt.s 6b 262 263 /* 264 * fix got table in RAM 265 */ 266 move.l %a0, %a1 267 add.l #(__got_start - CONFIG_SYS_MONITOR_BASE),%a1 268 move.l %a1,%a5 /* * fix got pointer register a5 */ 269 270 move.l %a0, %a2 271 add.l #(__got_end - CONFIG_SYS_MONITOR_BASE),%a2 272 2737: 274 move.l (%a1),%d1 275 sub.l #_start,%d1 276 add.l %a0,%d1 277 move.l %d1,(%a1)+ 278 cmp.l %a2, %a1 279 bne 7b 280 281 /* calculate relative jump to board_init_r in ram */ 282 move.l %a0, %a1 283 add.l #(board_init_r - CONFIG_SYS_MONITOR_BASE), %a1 284 285 /* set parameters for board_init_r */ 286 move.l %a0,-(%sp) /* dest_addr */ 287 move.l %d0,-(%sp) /* gd */ 288#if defined(DEBUG) && (CONFIG_SYS_TEXT_BASE != CONFIG_SYS_INT_FLASH_BASE) && \ 289 defined(CONFIG_SYS_HALT_BEFOR_RAM_JUMP) 290 halt 291#endif 292 jsr (%a1) 293 294/*------------------------------------------------------------------------------*/ 295/* exception code */ 296 .globl _fault 297_fault: 298 bra _fault 299 300 .globl _exc_handler 301_exc_handler: 302 SAVE_ALL 303 movel %sp,%sp@- 304 bsr exc_handler 305 addql #4,%sp 306 RESTORE_ALL 307 308 .globl _int_handler 309_int_handler: 310 SAVE_ALL 311 movel %sp,%sp@- 312 bsr int_handler 313 addql #4,%sp 314 RESTORE_ALL 315 316/*------------------------------------------------------------------------------*/ 317 318 .globl version_string 319version_string: 320 .ascii U_BOOT_VERSION_STRING, "\0" 321 .align 4 322