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 - 2003 Wolfgang Denk <wd@denx.de>
6 * See file CREDITS for list of people who contributed to this
9 * This program is free software; you can redistribute it and/or
10 * modify it under the terms of the GNU General Public License as
11 * published by the Free Software Foundation; either version 2 of
12 * the License, or (at your option) any later version.
14 * This program is distributed in the hope that it will be useful,
15 * but WITHOUT ANY WARRANTY; without even the implied warranty of
16 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
17 * GNU General Public License for more details.
19 * You should have received a copy of the GNU General Public License
20 * along with this program; if not, write to the Free Software
21 * Foundation, Inc., 59 Temple Place, Suite 330, Boston,
26 * U-Boot - Startup Code for MPC5xxx CPUs
32 #define CONFIG_MPC5xxx 1 /* needed for Linux kernel header files */
33 #define _LINUX_CONFIG_H 1 /* avoid reading Linux autoconf.h file */
35 #include <ppc_asm.tmpl>
38 #include <asm/cache.h>
41 #ifndef CONFIG_IDENT_STRING
42 #define CONFIG_IDENT_STRING ""
45 /* We don't want the MMU yet.
48 /* Floating Point enable, Machine Check and Recoverable Interr. */
50 #define MSR_KERNEL (MSR_FP|MSR_RI)
52 #define MSR_KERNEL (MSR_FP|MSR_ME|MSR_RI)
56 * Set up GOT: Global Offset Table
58 * Use r14 to access the GOT
61 GOT_ENTRY(_GOT2_TABLE_)
62 GOT_ENTRY(_FIXUP_TABLE_)
65 GOT_ENTRY(_start_of_vectors)
66 GOT_ENTRY(_end_of_vectors)
67 GOT_ENTRY(transfer_to_handler)
71 GOT_ENTRY(__bss_start)
81 .ascii " (", __DATE__, " - ", __TIME__, ")"
82 .ascii CONFIG_IDENT_STRING, "\0"
91 li r21, BOOTFLAG_COLD /* Normal Power-On */
95 . = EXC_OFF_SYS_RESET + 0x10
99 li r21, BOOTFLAG_WARM /* Software reboot */
104 mfmsr r5 /* save msr contents */
106 /* Move CSBoot and adjust instruction pointer */
107 /*--------------------------------------------------------------*/
109 #if defined(CFG_LOWBOOT)
110 #if defined(CFG_RAMBOOT)
111 #error CFG_LOWBOOT is incompatible with CFG_RAMBOOT
112 #endif /* CFG_RAMBOOT */
113 lis r4, CFG_DEFAULT_MBAR@h
114 lis r3, START_REG(CFG_BOOTCS_START)@h
115 ori r3, r3, START_REG(CFG_BOOTCS_START)@l
116 stw r3, 0x4(r4) /* CS0 start */
117 lis r3, STOP_REG(CFG_BOOTCS_START, CFG_BOOTCS_SIZE)@h
118 ori r3, r3, STOP_REG(CFG_BOOTCS_START, CFG_BOOTCS_SIZE)@l
119 stw r3, 0x8(r4) /* CS0 stop */
121 ori r3, r3, 0x02010000@l
122 stw r3, 0x54(r4) /* CS0 and Boot enable */
124 lis r3, lowboot_reentry@h /* jump from bootlow address space (0x0000xxxx) */
125 ori r3, r3, lowboot_reentry@l /* to the address space the linker used */
130 lis r3, START_REG(CFG_BOOTCS_START)@h
131 ori r3, r3, START_REG(CFG_BOOTCS_START)@l
132 stw r3, 0x4c(r4) /* Boot start */
133 lis r3, STOP_REG(CFG_BOOTCS_START, CFG_BOOTCS_SIZE)@h
134 ori r3, r3, STOP_REG(CFG_BOOTCS_START, CFG_BOOTCS_SIZE)@l
135 stw r3, 0x50(r4) /* Boot stop */
137 ori r3, r3, 0x02000001@l
138 stw r3, 0x54(r4) /* Boot enable, CS0 disable */
139 #endif /* CFG_LOWBOOT */
141 #if defined(CFG_DEFAULT_MBAR) && !defined(CFG_RAMBOOT)
143 ori r3, r3, CFG_MBAR@l
144 #if defined(CONFIG_MPC5200)
145 /* MBAR is mirrored into the MBAR SPR */
147 rlwinm r3, r3, 16, 16, 31
149 #if defined(CONFIG_MGT5100)
150 rlwinm r3, r3, 17, 15, 31
152 lis r4, CFG_DEFAULT_MBAR@h
154 #endif /* CFG_DEFAULT_MBAR */
156 /* Initialise the MPC5xxx processor core */
157 /*--------------------------------------------------------------*/
161 /* initialize some things that are hard to access from C */
162 /*--------------------------------------------------------------*/
164 /* set up stack in on-chip SRAM */
165 lis r3, CFG_INIT_RAM_ADDR@h
166 ori r3, r3, CFG_INIT_RAM_ADDR@l
167 ori r1, r3, CFG_INIT_SP_OFFSET
168 li r0, 0 /* Make room for stack frame header and */
169 stwu r0, -4(r1) /* clear final stack frame so that */
170 stwu r0, -4(r1) /* stack backtraces terminate cleanly */
172 /* let the C-code set up the rest */
174 /* Be careful to keep code relocatable ! */
175 /*--------------------------------------------------------------*/
177 GET_GOT /* initialize GOT access */
180 bl cpu_init_f /* run low-level CPU init code (in Flash)*/
184 bl board_init_f /* run 1st part of board init code (in Flash)*/
190 .globl _start_of_vectors
194 STD_EXCEPTION(0x200, MachineCheck, MachineCheckException)
196 /* Data Storage exception. */
197 STD_EXCEPTION(0x300, DataStorage, UnknownException)
199 /* Instruction Storage exception. */
200 STD_EXCEPTION(0x400, InstStorage, UnknownException)
202 /* External Interrupt exception. */
203 STD_EXCEPTION(0x500, ExtInterrupt, external_interrupt)
205 /* Alignment exception. */
213 addi r3,r1,STACK_FRAME_OVERHEAD
215 rlwimi r20,r23,0,16,16 /* copy EE bit from saved MSR */
216 rlwimi r20,r23,0,25,25 /* copy IP bit from saved MSR */
217 lwz r6,GOT(transfer_to_handler)
221 .long AlignmentException - _start + EXC_OFF_SYS_RESET
222 .long int_return - _start + EXC_OFF_SYS_RESET
224 /* Program check exception */
228 addi r3,r1,STACK_FRAME_OVERHEAD
230 rlwimi r20,r23,0,16,16 /* copy EE bit from saved MSR */
231 rlwimi r20,r23,0,25,25 /* copy IP bit from saved MSR */
232 lwz r6,GOT(transfer_to_handler)
236 .long ProgramCheckException - _start + EXC_OFF_SYS_RESET
237 .long int_return - _start + EXC_OFF_SYS_RESET
239 STD_EXCEPTION(0x800, FPUnavailable, UnknownException)
241 /* I guess we could implement decrementer, and may have
242 * to someday for timekeeping.
244 STD_EXCEPTION(0x900, Decrementer, timer_interrupt)
246 STD_EXCEPTION(0xa00, Trap_0a, UnknownException)
247 STD_EXCEPTION(0xb00, Trap_0b, UnknownException)
248 STD_EXCEPTION(0xc00, SystemCall, UnknownException)
249 STD_EXCEPTION(0xd00, SingleStep, UnknownException)
251 STD_EXCEPTION(0xe00, Trap_0e, UnknownException)
252 STD_EXCEPTION(0xf00, Trap_0f, UnknownException)
254 STD_EXCEPTION(0x1000, InstructionTLBMiss, UnknownException)
255 STD_EXCEPTION(0x1100, DataLoadTLBMiss, UnknownException)
256 STD_EXCEPTION(0x1200, DataStoreTLBMiss, UnknownException)
260 * This exception occurs when the program counter matches the
261 * Instruction Address Breakpoint Register (IABR).
263 * I want the cpu to halt if this occurs so I can hunt around
264 * with the debugger and look at things.
266 * When DEBUG is defined, both machine check enable (in the MSR)
267 * and checkstop reset enable (in the reset mode register) are
268 * turned off and so a checkstop condition will result in the cpu
271 * I force the cpu into a checkstop condition by putting an illegal
272 * instruction here (at least this is the theory).
274 * well - that didnt work, so just do an infinite loop!
278 STD_EXCEPTION(0x1300, InstructionBreakpoint, DebugException)
280 STD_EXCEPTION(0x1400, SMI, UnknownException)
282 STD_EXCEPTION(0x1500, Trap_15, UnknownException)
283 STD_EXCEPTION(0x1600, Trap_16, UnknownException)
284 STD_EXCEPTION(0x1700, Trap_17, UnknownException)
285 STD_EXCEPTION(0x1800, Trap_18, UnknownException)
286 STD_EXCEPTION(0x1900, Trap_19, UnknownException)
287 STD_EXCEPTION(0x1a00, Trap_1a, UnknownException)
288 STD_EXCEPTION(0x1b00, Trap_1b, UnknownException)
289 STD_EXCEPTION(0x1c00, Trap_1c, UnknownException)
290 STD_EXCEPTION(0x1d00, Trap_1d, UnknownException)
291 STD_EXCEPTION(0x1e00, Trap_1e, UnknownException)
292 STD_EXCEPTION(0x1f00, Trap_1f, UnknownException)
293 STD_EXCEPTION(0x2000, Trap_20, UnknownException)
294 STD_EXCEPTION(0x2100, Trap_21, UnknownException)
295 STD_EXCEPTION(0x2200, Trap_22, UnknownException)
296 STD_EXCEPTION(0x2300, Trap_23, UnknownException)
297 STD_EXCEPTION(0x2400, Trap_24, UnknownException)
298 STD_EXCEPTION(0x2500, Trap_25, UnknownException)
299 STD_EXCEPTION(0x2600, Trap_26, UnknownException)
300 STD_EXCEPTION(0x2700, Trap_27, UnknownException)
301 STD_EXCEPTION(0x2800, Trap_28, UnknownException)
302 STD_EXCEPTION(0x2900, Trap_29, UnknownException)
303 STD_EXCEPTION(0x2a00, Trap_2a, UnknownException)
304 STD_EXCEPTION(0x2b00, Trap_2b, UnknownException)
305 STD_EXCEPTION(0x2c00, Trap_2c, UnknownException)
306 STD_EXCEPTION(0x2d00, Trap_2d, UnknownException)
307 STD_EXCEPTION(0x2e00, Trap_2e, UnknownException)
308 STD_EXCEPTION(0x2f00, Trap_2f, UnknownException)
311 .globl _end_of_vectors
317 * This code finishes saving the registers to the exception frame
318 * and jumps to the appropriate handler for the exception.
319 * Register r21 is pointer into trap frame, r1 has new stack pointer.
321 .globl transfer_to_handler
332 andi. r24,r23,0x3f00 /* get vector offset */
336 lwz r24,0(r23) /* virtual address of handler */
337 lwz r23,4(r23) /* where to go when done */
342 rfi /* jump to handler, enable MMU */
345 mfmsr r28 /* Disable interrupts */
349 SYNC /* Some chip revs need this... */
364 lwz r2,_NIP(r1) /* Restore environment */
375 * This code initialises the MPC5xxx processor core
376 * (conforms to PowerPC 603e spec)
377 * Note: expects original MSR contents to be in r5.
383 /* Initialize machine status; enable machine check interrupt */
384 /*--------------------------------------------------------------*/
386 li r3, MSR_KERNEL /* Set ME and RI flags */
387 rlwimi r3, r5, 0, 25, 25 /* preserve IP bit set by HRCW */
389 rlwimi r3, r5, 0, 21, 22 /* debugger might set SE & BE bits */
391 SYNC /* Some chip revs need this... */
394 mtspr SRR1, r3 /* Make SRR1 match MSR */
396 /* Initialize the Hardware Implementation-dependent Registers */
397 /* HID0 also contains cache control */
398 /*--------------------------------------------------------------*/
400 lis r3, CFG_HID0_INIT@h
401 ori r3, r3, CFG_HID0_INIT@l
405 lis r3, CFG_HID0_FINAL@h
406 ori r3, r3, CFG_HID0_FINAL@l
410 /* clear all BAT's */
411 /*--------------------------------------------------------------*/
448 /* invalidate all tlb's */
450 /* From the 603e User Manual: "The 603e provides the ability to */
451 /* invalidate a TLB entry. The TLB Invalidate Entry (tlbie) */
452 /* instruction invalidates the TLB entry indexed by the EA, and */
453 /* operates on both the instruction and data TLBs simultaneously*/
454 /* invalidating four TLB entries (both sets in each TLB). The */
455 /* index corresponds to bits 15-19 of the EA. To invalidate all */
456 /* entries within both TLBs, 32 tlbie instructions should be */
457 /* issued, incrementing this field by one each time." */
459 /* "Note that the tlbia instruction is not implemented on the */
462 /* bits 15-19 correspond to addresses 0x00000000 to 0x0001F000 */
463 /* incrementing by 0x1000 each time. The code below is sort of */
464 /* based on code in "flush_tlbs" from arch/ppc/kernel/head.S */
466 /*--------------------------------------------------------------*/
477 /*--------------------------------------------------------------*/
483 * Note: requires that all cache bits in
484 * HID0 are in the low half word.
491 ori r4, r4, HID0_ILOCK
493 ori r4, r3, HID0_ICFI
495 mtspr HID0, r4 /* sets enable and invalidate, clears lock */
497 mtspr HID0, r3 /* clears invalidate */
500 .globl icache_disable
504 ori r4, r4, HID0_ICE|HID0_ILOCK
506 ori r4, r3, HID0_ICFI
508 mtspr HID0, r4 /* sets invalidate, clears enable and lock */
510 mtspr HID0, r3 /* clears invalidate */
516 rlwinm r3, r3, HID0_ICE_BITPOS + 1, 31, 31
524 ori r4, r4, HID0_DLOCK
528 mtspr HID0, r4 /* sets enable and invalidate, clears lock */
530 mtspr HID0, r3 /* clears invalidate */
533 .globl dcache_disable
537 ori r4, r4, HID0_DCE|HID0_DLOCK
541 mtspr HID0, r4 /* sets invalidate, clears enable and lock */
543 mtspr HID0, r3 /* clears invalidate */
549 rlwinm r3, r3, HID0_DCE_BITPOS + 1, 31, 31
557 /*------------------------------------------------------------------------------*/
560 * void relocate_code (addr_sp, gd, addr_moni)
562 * This "function" does not return, instead it continues in RAM
563 * after relocating the monitor code.
567 * r5 = length in bytes
572 mr r1, r3 /* Set new stack pointer */
573 mr r9, r4 /* Save copy of Global Data pointer */
574 mr r10, r5 /* Save copy of Destination Address */
576 mr r3, r5 /* Destination Address */
577 lis r4, CFG_MONITOR_BASE@h /* Source Address */
578 ori r4, r4, CFG_MONITOR_BASE@l
579 lwz r5, GOT(__init_end)
581 li r6, CFG_CACHELINE_SIZE /* Cache Line Size */
586 * New GOT-PTR = (old GOT-PTR - CFG_MONITOR_BASE) + Destination Address
592 /* First our own GOT */
594 /* then the one used by the C code */
604 beq cr1,4f /* In place copy is not necessary */
605 beq 7f /* Protect against 0 count */
624 * Now flush the cache: note that we must start from a cache aligned
625 * address. Otherwise we might miss one cache line.
629 beq 7f /* Always flush prefetch queue in any case */
632 mfspr r7,HID0 /* don't do dcbst if dcache is disabled */
633 rlwinm r7,r7,HID0_DCE_BITPOS+1,31,31
641 sync /* Wait for all dcbst to complete on bus */
642 9: mfspr r7,HID0 /* don't do icbi if icache is disabled */
643 rlwinm r7,r7,HID0_ICE_BITPOS+1,31,31
651 7: sync /* Wait for all icbi to complete on bus */
655 * We are done. Do not return, instead branch to second part of board
656 * initialization, now running from RAM.
659 addi r0, r10, in_ram - _start + EXC_OFF_SYS_RESET
666 * Relocation Function, r14 point to got2+0x8000
668 * Adjust got2 pointers, no need to check for 0, this code
669 * already puts a few entries in the table.
671 li r0,__got2_entries@sectoff@l
672 la r3,GOT(_GOT2_TABLE_)
673 lwz r11,GOT(_GOT2_TABLE_)
683 * Now adjust the fixups and the pointers to the fixups
684 * in case we need to move ourselves again.
686 2: li r0,__fixup_entries@sectoff@l
687 lwz r3,GOT(_FIXUP_TABLE_)
701 * Now clear BSS segment
703 lwz r3,GOT(__bss_start)
717 mr r3, r9 /* Global Data pointer */
718 mr r4, r10 /* Destination Address */
722 * Copy exception vector code to low memory
725 * r7: source address, r8: end address, r9: target address
730 lwz r8, GOT(_end_of_vectors)
732 li r9, 0x100 /* reset vector always at 0x100 */
735 bgelr /* return if r7>=r8 - just in case */
737 mflr r4 /* save link register */
747 * relocate `hdlr' and `int_return' entries
749 li r7, .L_MachineCheck - _start + EXC_OFF_SYS_RESET
750 li r8, Alignment - _start + EXC_OFF_SYS_RESET
753 addi r7, r7, 0x100 /* next exception vector */
757 li r7, .L_Alignment - _start + EXC_OFF_SYS_RESET
760 li r7, .L_ProgramCheck - _start + EXC_OFF_SYS_RESET
763 li r7, .L_FPUnavailable - _start + EXC_OFF_SYS_RESET
764 li r8, SystemCall - _start + EXC_OFF_SYS_RESET
767 addi r7, r7, 0x100 /* next exception vector */
771 li r7, .L_SingleStep - _start + EXC_OFF_SYS_RESET
772 li r8, _end_of_vectors - _start + EXC_OFF_SYS_RESET
775 addi r7, r7, 0x100 /* next exception vector */
779 mfmsr r3 /* now that the vectors have */
780 lis r7, MSR_IP@h /* relocated into low memory */
781 ori r7, r7, MSR_IP@l /* MSR[IP] can be turned off */
782 andc r3, r3, r7 /* (if it was on) */
783 SYNC /* Some chip revs need this... */
787 mtlr r4 /* restore link register */
791 * Function: relocate entries for one exception vector
794 lwz r0, 0(r7) /* hdlr ... */
795 add r0, r0, r3 /* ... += dest_addr */
798 lwz r0, 4(r7) /* int_return ... */
799 add r0, r0, r3 /* ... += dest_addr */