2 * Copyright (C) 1998 Dan Malek <dmalek@jlc.net>
3 * Copyright (C) 1999 Magnus Damm <kieraypc01.p.y.kie.era.ericsson.se>
4 * Copyright (C) 2000, 2001, 2002 Wolfgang Denk <wd@denx.de>
5 * Copyright (C) 2003 Martin Winistoerfer, martinwinistoerfer@gmx.ch.
7 * See file CREDITS for list of people who contributed to this
10 * This program is free software; you can redistribute it and/or
11 * modify it under the terms of the GNU General Public License as
12 * published by the Free Software Foundation; either version 2 of
13 * the License, or (at your option) any later version.
15 * This program is distributed in the hope that it will be useful,
16 * but WITHOUT ANY WARRANTY; without even the implied warranty of
17 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
18 * GNU General Public License for more details.
20 * You should have received a copy of the GNU General Public License
21 * along with this program; if not, write to the Free Software
22 * Foundation, Inc., 59 Temple Place, Suite 330, Boston,
29 * Discription: startup code
35 #include <timestamp.h>
38 #define CONFIG_5xx 1 /* needed for Linux kernel header files */
39 #define _LINUX_CONFIG_H 1 /* avoid reading Linux autoconf.h file */
41 #include <ppc_asm.tmpl>
44 #include <linux/config.h>
45 #include <asm/processor.h>
47 #ifndef CONFIG_IDENT_STRING
48 #define CONFIG_IDENT_STRING ""
51 /* We don't have a MMU.
54 #define MSR_KERNEL ( MSR_ME | MSR_RI ) /* Machine Check and Recoverable Interr. */
57 * Set up GOT: Global Offset Table
59 * Use r14 to access the GOT
62 GOT_ENTRY(_GOT2_TABLE_)
63 GOT_ENTRY(_FIXUP_TABLE_)
66 GOT_ENTRY(_start_of_vectors)
67 GOT_ENTRY(_end_of_vectors)
68 GOT_ENTRY(transfer_to_handler)
72 GOT_ENTRY(__bss_start)
76 * r3 - 1st arg to board_init(): IMMP pointer
77 * r4 - 2nd arg to board_init(): boot flag
80 .long 0x27051956 /* U-Boot Magic Number */
84 .ascii " (", U_BOOT_DATE, " - ", U_BOOT_TIME, ")"
85 .ascii CONFIG_IDENT_STRING, "\0"
91 li r4, CONFIG_SYS_ISB /* Set ISB bit */
94 li r21, BOOTFLAG_COLD /* Normal Power-On: Boot from FLASH */
97 . = EXC_OFF_SYS_RESET + 0x20
101 li r21, BOOTFLAG_WARM /* Software reboot */
107 /* Initialize machine status; enable machine check interrupt */
108 /*----------------------------------------------------------------------*/
109 li r3, MSR_KERNEL /* Set ME, RI flags */
111 mtspr SRR1, r3 /* Make SRR1 match MSR */
113 /* Initialize debug port registers */
114 /*----------------------------------------------------------------------*/
115 xor r0, r0, r0 /* Clear R0 */
116 mtspr LCTRL1, r0 /* Initialize debug port regs */
121 #if defined(CONFIG_PATI)
122 /* the external flash access on PATI fails if programming the PLL to 40MHz.
123 * Copy the PLL programming code to the internal RAM and execute it
124 *----------------------------------------------------------------------*/
125 lis r3, CONFIG_SYS_MONITOR_BASE@h
126 ori r3, r3, CONFIG_SYS_MONITOR_BASE@l
127 addi r3, r3, pll_prog_code_start - _start + EXC_OFF_SYS_RESET
129 lis r4, CONFIG_SYS_INIT_RAM_ADDR@h
130 ori r4, r4, CONFIG_SYS_INIT_RAM_ADDR@l
133 ori r5,r5,((pll_prog_code_end - pll_prog_code_start) >>2)
140 bdnz 0b /* copy loop */
145 * Calculate absolute address in FLASH and jump there
146 *----------------------------------------------------------------------*/
148 lis r3, CONFIG_SYS_MONITOR_BASE@h
149 ori r3, r3, CONFIG_SYS_MONITOR_BASE@l
150 addi r3, r3, in_flash - _start + EXC_OFF_SYS_RESET
156 /* Initialize some SPRs that are hard to access from C */
157 /*----------------------------------------------------------------------*/
159 lis r3, CONFIG_SYS_IMMR@h /* Pass IMMR as arg1 to C routine */
160 lis r2, CONFIG_SYS_INIT_SP_ADDR@h
161 ori r1, r2, CONFIG_SYS_INIT_SP_ADDR@l /* Set up the stack in internal SRAM */
162 /* Note: R0 is still 0 here */
163 stwu r0, -4(r1) /* Clear final stack frame so that */
164 stwu r0, -4(r1) /* stack backtraces terminate cleanly */
167 * Disable serialized ifetch and show cycles
168 * (i.e. set processor to normal mode) for maximum
175 /* Set up debug mode entry */
177 lis r2, CONFIG_SYS_DER@h
178 ori r2, r2, CONFIG_SYS_DER@l
181 /* Let the C-code set up the rest */
183 /* Be careful to keep code relocatable ! */
184 /*----------------------------------------------------------------------*/
186 GET_GOT /* initialize GOT access */
189 bl cpu_init_f /* run low-level CPU init code (from Flash) */
193 bl board_init_f /* run 1st part of board init code (from Flash) */
196 .globl _start_of_vectors
200 STD_EXCEPTION(0x200, MachineCheck, MachineCheckException)
202 /* Data Storage exception. "Never" generated on the 860. */
203 STD_EXCEPTION(0x300, DataStorage, UnknownException)
205 /* Instruction Storage exception. "Never" generated on the 860. */
206 STD_EXCEPTION(0x400, InstStorage, UnknownException)
208 /* External Interrupt exception. */
209 STD_EXCEPTION(0x500, ExtInterrupt, external_interrupt)
211 /* Alignment exception. */
214 EXCEPTION_PROLOG(SRR0, SRR1)
219 addi r3,r1,STACK_FRAME_OVERHEAD
221 rlwimi r20,r23,0,16,16 /* copy EE bit from saved MSR */
222 lwz r6,GOT(transfer_to_handler)
226 .long AlignmentException - _start + EXC_OFF_SYS_RESET
227 .long int_return - _start + EXC_OFF_SYS_RESET
229 /* Program check exception */
232 EXCEPTION_PROLOG(SRR0, SRR1)
233 addi r3,r1,STACK_FRAME_OVERHEAD
235 rlwimi r20,r23,0,16,16 /* copy EE bit from saved MSR */
236 lwz r6,GOT(transfer_to_handler)
240 .long ProgramCheckException - _start + EXC_OFF_SYS_RESET
241 .long int_return - _start + EXC_OFF_SYS_RESET
243 /* FPU on MPC5xx available. We will use it later.
245 STD_EXCEPTION(0x800, FPUnavailable, UnknownException)
247 /* I guess we could implement decrementer, and may have
248 * to someday for timekeeping.
250 STD_EXCEPTION(0x900, Decrementer, timer_interrupt)
251 STD_EXCEPTION(0xa00, Trap_0a, UnknownException)
252 STD_EXCEPTION(0xb00, Trap_0b, UnknownException)
253 STD_EXCEPTION(0xc00, SystemCall, UnknownException)
254 STD_EXCEPTION(0xd00, SingleStep, UnknownException)
256 STD_EXCEPTION(0xe00, Trap_0e, UnknownException)
257 STD_EXCEPTION(0xf00, Trap_0f, UnknownException)
259 /* On the MPC8xx, this is a software emulation interrupt. It occurs
260 * for all unimplemented and illegal instructions.
262 STD_EXCEPTION(0x1000, SoftEmu, SoftEmuException)
263 STD_EXCEPTION(0x1100, InstructionTLBMiss, UnknownException)
264 STD_EXCEPTION(0x1200, DataTLBMiss, UnknownException)
265 STD_EXCEPTION(0x1300, InstructionTLBError, UnknownException)
266 STD_EXCEPTION(0x1400, DataTLBError, UnknownException)
268 STD_EXCEPTION(0x1500, Reserved5, UnknownException)
269 STD_EXCEPTION(0x1600, Reserved6, UnknownException)
270 STD_EXCEPTION(0x1700, Reserved7, UnknownException)
271 STD_EXCEPTION(0x1800, Reserved8, UnknownException)
272 STD_EXCEPTION(0x1900, Reserved9, UnknownException)
273 STD_EXCEPTION(0x1a00, ReservedA, UnknownException)
274 STD_EXCEPTION(0x1b00, ReservedB, UnknownException)
276 STD_EXCEPTION(0x1c00, DataBreakpoint, UnknownException)
277 STD_EXCEPTION(0x1d00, InstructionBreakpoint, DebugException)
278 STD_EXCEPTION(0x1e00, PeripheralBreakpoint, UnknownException)
279 STD_EXCEPTION(0x1f00, DevPortBreakpoint, UnknownException)
282 .globl _end_of_vectors
289 * This code finishes saving the registers to the exception frame
290 * and jumps to the appropriate handler for the exception.
291 * Register r21 is pointer into trap frame, r1 has new stack pointer.
293 .globl transfer_to_handler
304 andi. r24,r23,0x3f00 /* get vector offset */
308 mtspr SPRG2,r22 /* r1 is now kernel sp */
309 lwz r24,0(r23) /* virtual address of handler */
310 lwz r23,4(r23) /* where to go when done */
315 rfi /* jump to handler, enable MMU */
318 mfmsr r28 /* Disable interrupts */
322 SYNC /* Some chip revs need this... */
337 lwz r2,_NIP(r1) /* Restore environment */
349 * unsigned int get_immr (unsigned int mask)
351 * return (mask ? (IMMR & mask) : IMMR);
355 mr r4,r3 /* save mask */
356 mfspr r3, IMMR /* IMMR */
357 cmpwi 0,r4,0 /* mask != 0 ? */
359 and r3,r3,r4 /* IMMR & mask */
369 /*------------------------------------------------------------------------------*/
372 * void relocate_code (addr_sp, gd, addr_moni)
374 * This "function" does not return, instead it continues in RAM
375 * after relocating the monitor code.
379 * r5 = length in bytes
384 mr r1, r3 /* Set new stack pointer in SRAM */
385 mr r9, r4 /* Save copy of global data pointer in SRAM */
386 mr r10, r5 /* Save copy of monitor destination Address in SRAM */
388 mr r3, r5 /* Destination Address */
389 lis r4, CONFIG_SYS_MONITOR_BASE@h /* Source Address */
390 ori r4, r4, CONFIG_SYS_MONITOR_BASE@l
391 lwz r5, GOT(__init_end)
397 * New GOT-PTR = (old GOT-PTR - CONFIG_SYS_MONITOR_BASE) + Destination Address
403 /* First our own GOT */
405 /* the the one used by the C code */
415 beq cr1,4f /* In place copy is not necessary */
416 beq 4f /* Protect against 0 count */
438 * We are done. Do not return, instead branch to second part of board
439 * initialization, now running from RAM.
442 addi r0, r10, in_ram - _start + EXC_OFF_SYS_RESET
449 * Relocation Function, r14 point to got2+0x8000
451 * Adjust got2 pointers, no need to check for 0, this code
452 * already puts a few entries in the table.
454 li r0,__got2_entries@sectoff@l
455 la r3,GOT(_GOT2_TABLE_)
456 lwz r11,GOT(_GOT2_TABLE_)
466 * Now adjust the fixups and the pointers to the fixups
467 * in case we need to move ourselves again.
469 2: li r0,__fixup_entries@sectoff@l
470 lwz r3,GOT(_FIXUP_TABLE_)
484 * Now clear BSS segment
486 lwz r3,GOT(__bss_start)
499 mr r3, r9 /* Global Data pointer */
500 mr r4, r10 /* Destination Address */
504 * Copy exception vector code to low memory
507 * r7: source address, r8: end address, r9: target address
512 lwz r8, GOT(_end_of_vectors)
514 li r9, 0x100 /* reset vector always at 0x100 */
517 bgelr /* return if r7>=r8 - just in case */
519 mflr r4 /* save link register */
529 * relocate `hdlr' and `int_return' entries
531 li r7, .L_MachineCheck - _start + EXC_OFF_SYS_RESET
532 li r8, Alignment - _start + EXC_OFF_SYS_RESET
535 addi r7, r7, 0x100 /* next exception vector */
539 li r7, .L_Alignment - _start + EXC_OFF_SYS_RESET
542 li r7, .L_ProgramCheck - _start + EXC_OFF_SYS_RESET
545 li r7, .L_FPUnavailable - _start + EXC_OFF_SYS_RESET
546 li r8, SystemCall - _start + EXC_OFF_SYS_RESET
549 addi r7, r7, 0x100 /* next exception vector */
553 li r7, .L_SingleStep - _start + EXC_OFF_SYS_RESET
554 li r8, _end_of_vectors - _start + EXC_OFF_SYS_RESET
557 addi r7, r7, 0x100 /* next exception vector */
561 mtlr r4 /* restore link register */
565 * Function: relocate entries for one exception vector
568 lwz r0, 0(r7) /* hdlr ... */
569 add r0, r0, r3 /* ... += dest_addr */
572 lwz r0, 4(r7) /* int_return ... */
573 add r0, r0, r3 /* ... += dest_addr */
582 #if defined(CONFIG_PATI)
583 /* Program the PLL */
585 lis r4, (CONFIG_SYS_IMMR + 0x002fc384)@h
586 ori r4, r4, (CONFIG_SYS_IMMR + 0x002fc384)@l
587 lis r3, (0x55ccaa33)@h
588 ori r3, r3, (0x55ccaa33)@l
590 lis r4, (CONFIG_SYS_IMMR + 0x002fc284)@h
591 ori r4, r4, (CONFIG_SYS_IMMR + 0x002fc284)@l
592 lis r3, CONFIG_SYS_PLPRCR@h
593 ori r3, r3, CONFIG_SYS_PLPRCR@l
599 bdnz ..spinlp /* spin loop */