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>
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,
24 /*------------------------------------------------------------------------------+ */
26 /* This source code has been made available to you by IBM on an AS-IS */
27 /* basis. Anyone receiving this source is licensed under IBM */
28 /* copyrights to use it in any way he or she deems fit, including */
29 /* copying it, modifying it, compiling it, and redistributing it either */
30 /* with or without modifications. No license under IBM patents or */
31 /* patent applications is to be implied by the copyright license. */
33 /* Any user of this software should understand that IBM cannot provide */
34 /* technical support for this software and will not be responsible for */
35 /* any consequences resulting from the use of this software. */
37 /* Any person who transfers this source code or any derivative work */
38 /* must include the IBM copyright notice, this paragraph, and the */
39 /* preceding two paragraphs in the transferred software. */
41 /* COPYRIGHT I B M CORPORATION 1995 */
42 /* LICENSED MATERIAL - PROGRAM PROPERTY OF I B M */
43 /*------------------------------------------------------------------------------- */
45 /* U-Boot - Startup Code for AMCC 4xx PowerPC based Embedded Boards
48 * The processor starts at 0xfffffffc and the code is executed
50 * in memory, but as long we don't jump around before relocating.
51 * board_init lies at a quite high address and when the cpu has
52 * jumped there, everything is ok.
53 * This works because the cpu gives the FLASH (CS0) the whole
54 * address space at startup, and board_init lies as a echo of
55 * the flash somewhere up there in the memorymap.
57 * board_init will change CS0 to be positioned at the correct
58 * address and (s)dram will be positioned at address 0
65 #define _LINUX_CONFIG_H 1 /* avoid reading Linux autoconf.h file */
67 #include <ppc_asm.tmpl>
70 #include <asm/cache.h>
73 #ifndef CONFIG_IDENT_STRING
74 #define CONFIG_IDENT_STRING ""
77 #ifdef CFG_INIT_DCACHE_CS
78 # if (CFG_INIT_DCACHE_CS == 0)
82 # if (CFG_INIT_DCACHE_CS == 1)
86 # if (CFG_INIT_DCACHE_CS == 2)
90 # if (CFG_INIT_DCACHE_CS == 3)
94 # if (CFG_INIT_DCACHE_CS == 4)
98 # if (CFG_INIT_DCACHE_CS == 5)
102 # if (CFG_INIT_DCACHE_CS == 6)
106 # if (CFG_INIT_DCACHE_CS == 7)
110 #endif /* CFG_INIT_DCACHE_CS */
112 /* We don't want the MMU yet.
115 #define MSR_KERNEL ( MSR_ME ) /* Machine Check */
118 .extern ext_bus_cntlr_init
122 * Set up GOT: Global Offset Table
124 * Use r14 to access the GOT
127 GOT_ENTRY(_GOT2_TABLE_)
128 GOT_ENTRY(_FIXUP_TABLE_)
131 GOT_ENTRY(_start_of_vectors)
132 GOT_ENTRY(_end_of_vectors)
133 GOT_ENTRY(transfer_to_handler)
135 GOT_ENTRY(__init_end)
137 GOT_ENTRY(__bss_start)
141 * 440 Startup -- on reset only the top 4k of the effective
142 * address space is mapped in by an entry in the instruction
143 * and data shadow TLB. The .bootpg section is located in the
144 * top 4k & does only what's necessary to map in the the rest
145 * of the boot rom. Once the boot rom is mapped in we can
146 * proceed with normal startup.
148 * NOTE: CS0 only covers the top 2MB of the effective address
152 #if defined(CONFIG_440)
153 .section .bootpg,"ax"
156 /**************************************************************************/
158 /*----------------------------------------------------------------*/
159 /* Clear and set up some registers. */
160 /*----------------------------------------------------------------*/
161 iccci r0,r0 /* NOTE: operands not used for 440 */
162 dccci r0,r0 /* NOTE: operands not used for 440 */
169 #if defined(CONFIG_440GX) || defined(CONFIG_440SP) /* NOTE: 440GX adds machine check status regs */
175 /*----------------------------------------------------------------*/
176 /* Initialize debug */
177 /*----------------------------------------------------------------*/
190 mtspr dbsr,r1 /* Clear all valid bits */
192 /*----------------------------------------------------------------*/
194 /*----------------------------------------------------------------*/
195 /* Disable store gathering & broadcast, guarantee inst/data
196 * cache block touch, force load/store alignment
197 * (see errata 1.12: 440_33)
199 lis r1,0x0030 /* store gathering & broadcast disable */
200 ori r1,r1,0x6000 /* cache touch */
203 /*----------------------------------------------------------------*/
204 /* Setup interrupt vectors */
205 /*----------------------------------------------------------------*/
206 mtspr ivpr,r0 /* Vectors start at 0x0000_0000 */
208 mtspr ivor0,r1 /* Critical input */
210 mtspr ivor1,r1 /* Machine check */
212 mtspr ivor2,r1 /* Data storage */
214 mtspr ivor3,r1 /* Instruction storage */
216 mtspr ivor4,r1 /* External interrupt */
218 mtspr ivor5,r1 /* Alignment */
220 mtspr ivor6,r1 /* Program check */
222 mtspr ivor7,r1 /* Floating point unavailable */
224 mtspr ivor8,r1 /* System call */
226 mtspr ivor10,r1 /* Decrementer (PIT for 440) */
228 mtspr ivor13,r1 /* Data TLB error */
230 mtspr ivor14,r1 /* Instr TLB error */
232 mtspr ivor15,r1 /* Debug */
234 /*----------------------------------------------------------------*/
235 /* Configure cache regions */
236 /*----------------------------------------------------------------*/
254 /*----------------------------------------------------------------*/
255 /* Cache victim limits */
256 /*----------------------------------------------------------------*/
257 /* floors 0, ceiling max to use the entire cache -- nothing locked
264 /*----------------------------------------------------------------*/
265 /* Clear all TLB entries -- TID = 0, TS = 0 */
266 /*----------------------------------------------------------------*/
268 li r1,0x003f /* 64 TLB entries */
270 0: tlbwe r0,r1,0x0000 /* Invalidate all entries (V=0)*/
274 /*----------------------------------------------------------------*/
275 /* TLB entry setup -- step thru tlbtab */
276 /*----------------------------------------------------------------*/
277 bl tlbtab /* Get tlbtab pointer */
279 li r1,0x003f /* 64 TLB entries max */
286 beq 2f /* 0 marks end */
289 tlbwe r0,r4,0 /* TLB Word 0 */
290 tlbwe r1,r4,1 /* TLB Word 1 */
291 tlbwe r2,r4,2 /* TLB Word 2 */
292 addi r4,r4,1 /* Next TLB */
295 /*----------------------------------------------------------------*/
296 /* Continue from 'normal' start */
297 /*----------------------------------------------------------------*/
302 mtspr srr1,r0 /* Keep things disabled for now */
306 #endif /* CONFIG_440 */
309 * r3 - 1st arg to board_init(): IMMP pointer
310 * r4 - 2nd arg to board_init(): boot flag
313 .long 0x27051956 /* U-Boot Magic Number */
314 .globl version_string
316 .ascii U_BOOT_VERSION
317 .ascii " (", __DATE__, " - ", __TIME__, ")"
318 .ascii CONFIG_IDENT_STRING, "\0"
321 * Maybe this should be moved somewhere else because the current
322 * location (0x100) is where the CriticalInput Execption should be.
324 . = EXC_OFF_SYS_RESET
328 /*****************************************************************************/
329 #if defined(CONFIG_440)
331 /*----------------------------------------------------------------*/
332 /* Clear and set up some registers. */
333 /*----------------------------------------------------------------*/
336 mtspr dec,r0 /* prevent dec exceptions */
337 mtspr tbl,r0 /* prevent fit & wdt exceptions */
339 mtspr tsr,r1 /* clear all timer exception status */
340 mtspr tcr,r0 /* disable all */
341 mtspr esr,r0 /* clear exception syndrome register */
342 mtxer r0 /* clear integer exception register */
344 /*----------------------------------------------------------------*/
345 /* Debug setup -- some (not very good) ice's need an event*/
346 /* to establish control :-( Define CFG_INIT_DBCR to the dbsr */
347 /* value you need in this case 0x8cff 0000 should do the trick */
348 /*----------------------------------------------------------------*/
349 #if defined(CFG_INIT_DBCR)
352 mtspr dbsr,r1 /* Clear all status bits */
353 lis r0,CFG_INIT_DBCR@h
354 ori r0,r0,CFG_INIT_DBCR@l
359 /*----------------------------------------------------------------*/
360 /* Setup the internal SRAM */
361 /*----------------------------------------------------------------*/
363 #if defined(CONFIG_440EP) || defined(CONFIG_440GR)
364 /* Clear Dcache to use as RAM */
365 addis r3,r0,CFG_INIT_RAM_ADDR@h
366 ori r3,r3,CFG_INIT_RAM_ADDR@l
367 addis r4,r0,CFG_INIT_RAM_END@h
368 ori r4,r4,CFG_INIT_RAM_END@l
369 rlwinm. r5,r4,0,27,31
380 #if defined (CONFIG_440GX) || defined(CONFIG_440SP)
381 mtdcr l2_cache_cfg,r0 /* Ensure L2 Cache is off */
383 mtdcr isram0_sb1cr,r0 /* Disable bank 1 */
388 and r1,r1,r2 /* Disable parity check */
391 andis. r1,r1,r2 /* Disable pwr mgmt */
394 lis r1,0x8000 /* BAS = 8000_0000 */
395 #if defined(CONFIG_440GX) || defined(CONFIG_440SP)
396 ori r1,r1,0x0980 /* first 64k */
397 mtdcr isram0_sb0cr,r1
399 ori r1,r1,0x0980 /* second 64k */
400 mtdcr isram0_sb1cr,r1
402 ori r1,r1, 0x0980 /* third 64k */
403 mtdcr isram0_sb2cr,r1
405 ori r1,r1, 0x0980 /* fourth 64k */
406 mtdcr isram0_sb3cr,r1
408 ori r1,r1,0x0380 /* 8k rw */
409 mtdcr isram0_sb0cr,r1
413 /*----------------------------------------------------------------*/
414 /* Setup the stack in internal SRAM */
415 /*----------------------------------------------------------------*/
416 lis r1,CFG_INIT_RAM_ADDR@h
417 ori r1,r1,CFG_INIT_SP_OFFSET@l
420 stwu r0,-4(r1) /* Terminate call chain */
422 stwu r1,-8(r1) /* Save back chain and move SP */
423 lis r0,RESET_VECTOR@h /* Address of reset vector */
424 ori r0,r0, RESET_VECTOR@l
425 stwu r1,-8(r1) /* Save back chain and move SP */
426 stw r0,+12(r1) /* Save return addr (underflow vect) */
430 bl cpu_init_f /* run low-level CPU init code (from Flash) */
433 #endif /* CONFIG_440 */
435 /*****************************************************************************/
437 /*----------------------------------------------------------------------- */
438 /* Set up some machine state registers. */
439 /*----------------------------------------------------------------------- */
440 addi r0,r0,0x0000 /* initialize r0 to zero */
441 mtspr esr,r0 /* clear Exception Syndrome Reg */
442 mttcr r0 /* timer control register */
443 mtexier r0 /* disable all interrupts */
444 addis r4,r0,0xFFFF /* set r4 to 0xFFFFFFFF (status in the */
445 ori r4,r4,0xFFFF /* dbsr is cleared by setting bits to 1) */
446 mtdbsr r4 /* clear/reset the dbsr */
447 mtexisr r4 /* clear all pending interrupts */
449 mtexier r4 /* enable critical exceptions */
450 addis r4,r0,0x0000 /* assume 403GCX - enable core clk */
451 ori r4,r4,0x4020 /* dbling (no harm done on GA and GC */
452 mtiocr r4 /* since bit not used) & DRC to latch */
453 /* data bus on rising edge of CAS */
454 /*----------------------------------------------------------------------- */
456 /*----------------------------------------------------------------------- */
458 /*----------------------------------------------------------------------- */
459 /* Invalidate i-cache and d-cache TAG arrays. */
460 /*----------------------------------------------------------------------- */
461 addi r3,0,1024 /* 1/4 of I-cache size, half of D-cache */
462 addi r4,0,1024 /* 1/4 of I-cache */
467 addic. r3,r3,-16 /* move back one cache line */
468 bne ..cloop /* loop back to do rest until r3 = 0 */
471 /* initialize IOP480 so it can read 1 MB code area for SRAM spaces */
472 /* this requires enabling MA[17..0], by default only MA[12..0] are enabled. */
475 /* first copy IOP480 register base address into r3 */
476 addis r3,0,0x5000 /* IOP480 register base address hi */
477 /* ori r3,r3,0x0000 / IOP480 register base address lo */
480 /* use r4 as the working variable */
481 /* turn on CS3 (LOCCTL.7) */
482 lwz r4,0x84(r3) /* LOCTL is at offset 0x84 */
483 andi. r4,r4,0xff7f /* make bit 7 = 0 -- CS3 mode */
484 stw r4,0x84(r3) /* LOCTL is at offset 0x84 */
487 #ifdef CONFIG_DASA_SIM
488 /* use r4 as the working variable */
489 /* turn on MA17 (LOCCTL.7) */
490 lwz r4,0x84(r3) /* LOCTL is at offset 0x84 */
491 ori r4,r4,0x80 /* make bit 7 = 1 -- MA17 mode */
492 stw r4,0x84(r3) /* LOCTL is at offset 0x84 */
495 /* turn on MA16..13 (LCS0BRD.12 = 0) */
496 lwz r4,0x100(r3) /* LCS0BRD is at offset 0x100 */
497 andi. r4,r4,0xefff /* make bit 12 = 0 */
498 stw r4,0x100(r3) /* LCS0BRD is at offset 0x100 */
500 /* make sure above stores all comlete before going on */
503 /* last thing, set local init status done bit (DEVINIT.31) */
504 lwz r4,0x80(r3) /* DEVINIT is at offset 0x80 */
505 oris r4,r4,0x8000 /* make bit 31 = 1 */
506 stw r4,0x80(r3) /* DEVINIT is at offset 0x80 */
508 /* clear all pending interrupts and disable all interrupts */
509 li r4,-1 /* set p1 to 0xffffffff */
510 stw r4,0x1b0(r3) /* clear all pending interrupts */
511 stw r4,0x1b8(r3) /* clear all pending interrupts */
512 li r4,0 /* set r4 to 0 */
513 stw r4,0x1b4(r3) /* disable all interrupts */
514 stw r4,0x1bc(r3) /* disable all interrupts */
516 /* make sure above stores all comlete before going on */
519 /*----------------------------------------------------------------------- */
520 /* Enable two 128MB cachable regions. */
521 /*----------------------------------------------------------------------- */
524 mticcr r1 /* instruction cache */
528 mtdccr r1 /* data cache */
530 addis r1,r0,CFG_INIT_RAM_ADDR@h
531 ori r1,r1,CFG_INIT_SP_OFFSET /* set up the stack to SDRAM */
532 li r0, 0 /* Make room for stack frame header and */
533 stwu r0, -4(r1) /* clear final stack frame so that */
534 stwu r0, -4(r1) /* stack backtraces terminate cleanly */
536 GET_GOT /* initialize GOT access */
538 bl board_init_f /* run first part of init code (from Flash) */
540 #endif /* CONFIG_IOP480 */
542 /*****************************************************************************/
543 #if defined(CONFIG_405GP) || defined(CONFIG_405CR) || defined(CONFIG_405) || defined(CONFIG_405EP)
544 /*----------------------------------------------------------------------- */
545 /* Clear and set up some registers. */
546 /*----------------------------------------------------------------------- */
550 mtesr r4 /* clear Exception Syndrome Reg */
551 mttcr r4 /* clear Timer Control Reg */
552 mtxer r4 /* clear Fixed-Point Exception Reg */
553 mtevpr r4 /* clear Exception Vector Prefix Reg */
554 addi r4,r0,(0xFFFF-0x10000) /* set r4 to 0xFFFFFFFF (status in the */
555 /* dbsr is cleared by setting bits to 1) */
556 mtdbsr r4 /* clear/reset the dbsr */
558 /*----------------------------------------------------------------------- */
559 /* Invalidate I and D caches. Enable I cache for defined memory regions */
560 /* to speed things up. Leave the D cache disabled for now. It will be */
561 /* enabled/left disabled later based on user selected menu options. */
562 /* Be aware that the I cache may be disabled later based on the menu */
563 /* options as well. See miscLib/main.c. */
564 /*----------------------------------------------------------------------- */
568 /*----------------------------------------------------------------------- */
569 /* Enable two 128MB cachable regions. */
570 /*----------------------------------------------------------------------- */
573 mticcr r4 /* instruction cache */
578 mtdccr r4 /* data cache */
580 #if !(defined(CFG_EBC_PB0AP) && defined(CFG_EBC_PB0CR))
581 /*----------------------------------------------------------------------- */
582 /* Tune the speed and size for flash CS0 */
583 /*----------------------------------------------------------------------- */
584 bl ext_bus_cntlr_init
587 #if defined(CONFIG_405EP)
588 /*----------------------------------------------------------------------- */
589 /* DMA Status, clear to come up clean */
590 /*----------------------------------------------------------------------- */
591 addis r3,r0, 0xFFFF /* Clear all existing DMA status */
595 bl ppc405ep_init /* do ppc405ep specific init */
596 #endif /* CONFIG_405EP */
598 #if defined(CFG_OCM_DATA_ADDR) && defined(CFG_OCM_DATA_SIZE)
599 /********************************************************************
600 * Setup OCM - On Chip Memory
601 *******************************************************************/
605 mfdcr r3, ocmiscntl /* get instr-side IRAM config */
606 mfdcr r4, ocmdscntl /* get data-side IRAM config */
607 and r3, r3, r0 /* disable data-side IRAM */
608 and r4, r4, r0 /* disable data-side IRAM */
609 mtdcr ocmiscntl, r3 /* set instr-side IRAM config */
610 mtdcr ocmdscntl, r4 /* set data-side IRAM config */
613 addis r3, 0, CFG_OCM_DATA_ADDR@h /* OCM location */
615 addis r4, 0, 0xC000 /* OCM data area enabled */
620 /*----------------------------------------------------------------------- */
621 /* Setup temporary stack in DCACHE or OCM if needed for SDRAM SPD. */
622 /*----------------------------------------------------------------------- */
623 #ifdef CFG_INIT_DCACHE_CS
624 /*----------------------------------------------------------------------- */
625 /* Memory Bank x (nothingness) initialization 1GB+64MEG */
626 /* used as temporary stack pointer for stage0 */
627 /*----------------------------------------------------------------------- */
640 /* turn on data chache for this region */
644 /* set stack pointer and clear stack to known value */
646 lis r1,CFG_INIT_RAM_ADDR@h
647 ori r1,r1,CFG_INIT_SP_OFFSET@l
649 li r4,2048 /* we store 2048 words to stack */
652 lis r2,CFG_INIT_RAM_ADDR@h /* we also clear data area */
653 ori r2,r2,CFG_INIT_RAM_END@l /* so cant copy value from r1 */
655 lis r4,0xdead /* we store 0xdeaddead in the stack */
662 li r0, 0 /* Make room for stack frame header and */
663 stwu r0, -4(r1) /* clear final stack frame so that */
664 stwu r0, -4(r1) /* stack backtraces terminate cleanly */
666 * Set up a dummy frame to store reset vector as return address.
667 * this causes stack underflow to reset board.
669 stwu r1, -8(r1) /* Save back chain and move SP */
670 addis r0, 0, RESET_VECTOR@h /* Address of reset vector */
671 ori r0, r0, RESET_VECTOR@l
672 stwu r1, -8(r1) /* Save back chain and move SP */
673 stw r0, +12(r1) /* Save return addr (underflow vect) */
675 #elif defined(CFG_TEMP_STACK_OCM) && \
676 (defined(CFG_OCM_DATA_ADDR) && defined(CFG_OCM_DATA_SIZE))
681 /* Set up Stack at top of OCM */
682 lis r1, (CFG_INIT_RAM_ADDR + CFG_INIT_SP_OFFSET)@h
683 ori r1, r1, (CFG_INIT_RAM_ADDR + CFG_INIT_SP_OFFSET)@l
685 /* Set up a zeroized stack frame so that backtrace works right */
691 * Set up a dummy frame to store reset vector as return address.
692 * this causes stack underflow to reset board.
694 stwu r1, -8(r1) /* Save back chain and move SP */
695 lis r0, RESET_VECTOR@h /* Address of reset vector */
696 ori r0, r0, RESET_VECTOR@l
697 stwu r1, -8(r1) /* Save back chain and move SP */
698 stw r0, +12(r1) /* Save return addr (underflow vect) */
699 #endif /* CFG_INIT_DCACHE_CS */
701 /*----------------------------------------------------------------------- */
702 /* Initialize SDRAM Controller */
703 /*----------------------------------------------------------------------- */
707 * Setup temporary stack pointer only for boards
708 * that do not use SDRAM SPD I2C stuff since it
709 * is already initialized to use DCACHE or OCM
712 #if !(defined(CFG_INIT_DCACHE_CS) || defined(CFG_TEMP_STACK_OCM))
713 lis r1, CFG_INIT_RAM_ADDR@h
714 ori r1,r1,CFG_INIT_SP_OFFSET /* set up the stack in SDRAM */
716 li r0, 0 /* Make room for stack frame header and */
717 stwu r0, -4(r1) /* clear final stack frame so that */
718 stwu r0, -4(r1) /* stack backtraces terminate cleanly */
720 * Set up a dummy frame to store reset vector as return address.
721 * this causes stack underflow to reset board.
723 stwu r1, -8(r1) /* Save back chain and move SP */
724 lis r0, RESET_VECTOR@h /* Address of reset vector */
725 ori r0, r0, RESET_VECTOR@l
726 stwu r1, -8(r1) /* Save back chain and move SP */
727 stw r0, +12(r1) /* Save return addr (underflow vect) */
728 #endif /* !(CFG_INIT_DCACHE_CS || !CFG_TEM_STACK_OCM) */
730 GET_GOT /* initialize GOT access */
732 bl cpu_init_f /* run low-level CPU init code (from Flash) */
735 bl board_init_f /* run first part of init code (from Flash) */
737 #endif /* CONFIG_405GP || CONFIG_405CR || CONFIG_405 || CONFIG_405EP */
738 /*----------------------------------------------------------------------- */
741 /*****************************************************************************/
742 .globl _start_of_vectors
746 /*TODO Fixup _start above so we can do this*/
747 /* Critical input. */
748 CRIT_EXCEPTION(0x100, CritcalInput, CritcalInputException)
752 CRIT_EXCEPTION(0x200, MachineCheck, MachineCheckException)
754 /* Data Storage exception. */
755 STD_EXCEPTION(0x300, DataStorage, UnknownException)
757 /* Instruction Storage exception. */
758 STD_EXCEPTION(0x400, InstStorage, UnknownException)
760 /* External Interrupt exception. */
761 STD_EXCEPTION(0x500, ExtInterrupt, external_interrupt)
763 /* Alignment exception. */
771 addi r3,r1,STACK_FRAME_OVERHEAD
773 rlwimi r20,r23,0,16,16 /* copy EE bit from saved MSR */
774 lwz r6,GOT(transfer_to_handler)
778 .long AlignmentException - _start + EXC_OFF_SYS_RESET
779 .long int_return - _start + EXC_OFF_SYS_RESET
781 /* Program check exception */
785 addi r3,r1,STACK_FRAME_OVERHEAD
787 rlwimi r20,r23,0,16,16 /* copy EE bit from saved MSR */
788 lwz r6,GOT(transfer_to_handler)
792 .long ProgramCheckException - _start + EXC_OFF_SYS_RESET
793 .long int_return - _start + EXC_OFF_SYS_RESET
795 /* No FPU on MPC8xx. This exception is not supposed to happen.
797 STD_EXCEPTION(0x800, FPUnavailable, UnknownException)
799 /* I guess we could implement decrementer, and may have
800 * to someday for timekeeping.
802 STD_EXCEPTION(0x900, Decrementer, timer_interrupt)
803 STD_EXCEPTION(0xa00, Trap_0a, UnknownException)
804 STD_EXCEPTION(0xb00, Trap_0b, UnknownException)
805 STD_EXCEPTION(0xc00, SystemCall, UnknownException)
806 STD_EXCEPTION(0xd00, SingleStep, UnknownException)
808 STD_EXCEPTION(0xe00, Trap_0e, UnknownException)
809 STD_EXCEPTION(0xf00, Trap_0f, UnknownException)
811 /* On the MPC8xx, this is a software emulation interrupt. It occurs
812 * for all unimplemented and illegal instructions.
814 STD_EXCEPTION(0x1000, PIT, PITException)
816 STD_EXCEPTION(0x1100, InstructionTLBMiss, UnknownException)
817 STD_EXCEPTION(0x1200, DataTLBMiss, UnknownException)
818 STD_EXCEPTION(0x1300, InstructionTLBError, UnknownException)
819 STD_EXCEPTION(0x1400, DataTLBError, UnknownException)
821 STD_EXCEPTION(0x1500, Reserved5, UnknownException)
822 STD_EXCEPTION(0x1600, Reserved6, UnknownException)
823 STD_EXCEPTION(0x1700, Reserved7, UnknownException)
824 STD_EXCEPTION(0x1800, Reserved8, UnknownException)
825 STD_EXCEPTION(0x1900, Reserved9, UnknownException)
826 STD_EXCEPTION(0x1a00, ReservedA, UnknownException)
827 STD_EXCEPTION(0x1b00, ReservedB, UnknownException)
829 STD_EXCEPTION(0x1c00, DataBreakpoint, UnknownException)
830 STD_EXCEPTION(0x1d00, InstructionBreakpoint, UnknownException)
831 STD_EXCEPTION(0x1e00, PeripheralBreakpoint, UnknownException)
832 STD_EXCEPTION(0x1f00, DevPortBreakpoint, UnknownException)
834 CRIT_EXCEPTION(0x2000, DebugBreakpoint, DebugException )
836 .globl _end_of_vectors
843 * This code finishes saving the registers to the exception frame
844 * and jumps to the appropriate handler for the exception.
845 * Register r21 is pointer into trap frame, r1 has new stack pointer.
847 .globl transfer_to_handler
859 mfspr r23,SPRG3 /* if from user, fix up tss.regs */
861 addi r24,r1,STACK_FRAME_OVERHEAD
863 2: addi r2,r23,-TSS /* set r2 to current */
867 andi. r24,r23,0x3f00 /* get vector offset */
871 mtspr SPRG2,r22 /* r1 is now kernel sp */
873 addi r24,r2,TASK_STRUCT_SIZE /* check for kernel stack overflow */
877 bgt stack_ovf /* if r2 < r1 < r2+TASK_STRUCT_SIZE */
879 lwz r24,0(r23) /* virtual address of handler */
880 lwz r23,4(r23) /* where to go when done */
885 rfi /* jump to handler, enable MMU */
888 mfmsr r28 /* Disable interrupts */
892 SYNC /* Some chip revs need this... */
907 lwz r2,_NIP(r1) /* Restore environment */
918 mfmsr r28 /* Disable interrupts */
922 SYNC /* Some chip revs need this... */
937 lwz r2,_NIP(r1) /* Restore environment */
939 mtspr 990,r2 /* SRR2 */
940 mtspr 991,r0 /* SRR3 */
950 iccci r0,r0 /* for 405, iccci invalidates the */
951 blr /* entire I cache */
954 addi r6,0,0x0000 /* clear GPR 6 */
955 /* Do loop for # of dcache congruence classes. */
956 lis r7, (CFG_DCACHE_SIZE / CFG_CACHELINE_SIZE / 2)@ha /* TBS for large sized cache */
957 ori r7, r7, (CFG_DCACHE_SIZE / CFG_CACHELINE_SIZE / 2)@l
958 /* NOTE: dccci invalidates both */
959 mtctr r7 /* ways in the D cache */
961 dccci 0,r6 /* invalidate line */
962 addi r6,r6, CFG_CACHELINE_SIZE /* bump to next line */
967 addis r9,r0,0x0002 /* set mask for EE and CE msr bits */
969 mfmsr r12 /* save msr */
971 mtmsr r9 /* disable EE and CE */
972 addi r10,r0,0x0001 /* enable data cache for unused memory */
973 mfdccr r9 /* region 0xF8000000-0xFFFFFFFF via */
974 or r10,r10,r9 /* bit 31 in dccr */
977 /* do loop for # of congruence classes. */
978 lis r10,(CFG_DCACHE_SIZE / CFG_CACHELINE_SIZE / 2)@ha /* TBS: for large cache sizes */
979 ori r10,r10,(CFG_DCACHE_SIZE / CFG_CACHELINE_SIZE / 2)@l
980 lis r11,(CFG_DCACHE_SIZE / 2)@ha /* D cache set size - 2 way sets */
981 ori r11,r11,(CFG_DCACHE_SIZE / 2)@l /* D cache set size - 2 way sets */
983 addi r10,r0,(0xE000-0x10000) /* start at 0xFFFFE000 */
984 add r11,r10,r11 /* add to get to other side of cache line */
986 lwz r3,0(r10) /* least recently used side */
987 lwz r3,0(r11) /* the other side */
988 dccci r0,r11 /* invalidate both sides */
989 addi r10,r10,CFG_CACHELINE_SIZE /* bump to next line */
990 addi r11,r11,CFG_CACHELINE_SIZE /* bump to next line */
991 bdnz ..flush_dcache_loop
992 sync /* allow memory access to complete */
993 mtdccr r9 /* restore dccr */
994 mtmsr r12 /* restore msr */
1000 bl invalidate_icache
1003 addis r3,r0, 0x8000 /* set bit 0 */
1007 .globl icache_disable
1009 addis r3,r0, 0x0000 /* clear bit 0 */
1014 .globl icache_status
1017 srwi r3, r3, 31 /* >>31 => select bit 0 */
1020 .globl dcache_enable
1023 bl invalidate_dcache
1026 addis r3,r0, 0x8000 /* set bit 0 */
1030 .globl dcache_disable
1035 addis r3,r0, 0x0000 /* clear bit 0 */
1039 .globl dcache_status
1042 srwi r3, r3, 31 /* >>31 => select bit 0 */
1050 #if !defined(CONFIG_440)
1062 /*------------------------------------------------------------------------------- */
1064 /* Description: Input 8 bits */
1065 /*------------------------------------------------------------------------------- */
1071 /*------------------------------------------------------------------------------- */
1072 /* Function: out8 */
1073 /* Description: Output 8 bits */
1074 /*------------------------------------------------------------------------------- */
1080 /*------------------------------------------------------------------------------- */
1081 /* Function: out16 */
1082 /* Description: Output 16 bits */
1083 /*------------------------------------------------------------------------------- */
1089 /*------------------------------------------------------------------------------- */
1090 /* Function: out16r */
1091 /* Description: Byte reverse and output 16 bits */
1092 /*------------------------------------------------------------------------------- */
1098 /*------------------------------------------------------------------------------- */
1099 /* Function: out32 */
1100 /* Description: Output 32 bits */
1101 /*------------------------------------------------------------------------------- */
1107 /*------------------------------------------------------------------------------- */
1108 /* Function: out32r */
1109 /* Description: Byte reverse and output 32 bits */
1110 /*------------------------------------------------------------------------------- */
1116 /*------------------------------------------------------------------------------- */
1117 /* Function: in16 */
1118 /* Description: Input 16 bits */
1119 /*------------------------------------------------------------------------------- */
1125 /*------------------------------------------------------------------------------- */
1126 /* Function: in16r */
1127 /* Description: Input 16 bits and byte reverse */
1128 /*------------------------------------------------------------------------------- */
1134 /*------------------------------------------------------------------------------- */
1135 /* Function: in32 */
1136 /* Description: Input 32 bits */
1137 /*------------------------------------------------------------------------------- */
1143 /*------------------------------------------------------------------------------- */
1144 /* Function: in32r */
1145 /* Description: Input 32 bits and byte reverse */
1146 /*------------------------------------------------------------------------------- */
1152 /*------------------------------------------------------------------------------- */
1153 /* Function: ppcDcbf */
1154 /* Description: Data Cache block flush */
1155 /* Input: r3 = effective address */
1157 /*------------------------------------------------------------------------------- */
1163 /*------------------------------------------------------------------------------- */
1164 /* Function: ppcDcbi */
1165 /* Description: Data Cache block Invalidate */
1166 /* Input: r3 = effective address */
1168 /*------------------------------------------------------------------------------- */
1174 /*------------------------------------------------------------------------------- */
1175 /* Function: ppcSync */
1176 /* Description: Processor Synchronize */
1179 /*------------------------------------------------------------------------------- */
1185 /*------------------------------------------------------------------------------*/
1188 * void relocate_code (addr_sp, gd, addr_moni)
1190 * This "function" does not return, instead it continues in RAM
1191 * after relocating the monitor code.
1195 * r5 = length in bytes
1196 * r6 = cachelinesize
1198 .globl relocate_code
1200 #if defined(CONFIG_440EP) || defined(CONFIG_440GR)
1201 dccci 0,0 /* Invalidate data cache, now no longer our stack */
1203 addi r1,r0,0x0000 /* TLB entry #0 */
1204 tlbre r0,r1,0x0002 /* Read contents */
1205 ori r0,r0,0x0c00 /* Or in the inhibit, write through bit */
1206 tlbwe r0,r1,0x0002 /* Save it out */
1209 mr r1, r3 /* Set new stack pointer */
1210 mr r9, r4 /* Save copy of Init Data pointer */
1211 mr r10, r5 /* Save copy of Destination Address */
1213 mr r3, r5 /* Destination Address */
1214 lis r4, CFG_MONITOR_BASE@h /* Source Address */
1215 ori r4, r4, CFG_MONITOR_BASE@l
1216 lwz r5, GOT(__init_end)
1218 li r6, CFG_CACHELINE_SIZE /* Cache Line Size */
1223 * New GOT-PTR = (old GOT-PTR - CFG_MONITOR_BASE) + Destination Address
1229 /* First our own GOT */
1231 /* the the one used by the C code */
1241 beq cr1,4f /* In place copy is not necessary */
1242 beq 7f /* Protect against 0 count */
1261 * Now flush the cache: note that we must start from a cache aligned
1262 * address. Otherwise we might miss one cache line.
1266 beq 7f /* Always flush prefetch queue in any case */
1274 sync /* Wait for all dcbst to complete on bus */
1280 7: sync /* Wait for all icbi to complete on bus */
1284 * We are done. Do not return, instead branch to second part of board
1285 * initialization, now running from RAM.
1288 addi r0, r10, in_ram - _start + EXC_OFF_SYS_RESET
1290 blr /* NEVER RETURNS! */
1295 * Relocation Function, r14 point to got2+0x8000
1297 * Adjust got2 pointers, no need to check for 0, this code
1298 * already puts a few entries in the table.
1300 li r0,__got2_entries@sectoff@l
1301 la r3,GOT(_GOT2_TABLE_)
1302 lwz r11,GOT(_GOT2_TABLE_)
1312 * Now adjust the fixups and the pointers to the fixups
1313 * in case we need to move ourselves again.
1315 2: li r0,__fixup_entries@sectoff@l
1316 lwz r3,GOT(_FIXUP_TABLE_)
1330 * Now clear BSS segment
1332 lwz r3,GOT(__bss_start)
1346 mr r3, r9 /* Init Data pointer */
1347 mr r4, r10 /* Destination Address */
1351 * Copy exception vector code to low memory
1354 * r7: source address, r8: end address, r9: target address
1359 lwz r8, GOT(_end_of_vectors)
1361 li r9, 0x100 /* reset vector always at 0x100 */
1364 bgelr /* return if r7>=r8 - just in case */
1366 mflr r4 /* save link register */
1376 * relocate `hdlr' and `int_return' entries
1378 li r7, .L_MachineCheck - _start + EXC_OFF_SYS_RESET
1379 li r8, Alignment - _start + EXC_OFF_SYS_RESET
1382 addi r7, r7, 0x100 /* next exception vector */
1386 li r7, .L_Alignment - _start + EXC_OFF_SYS_RESET
1389 li r7, .L_ProgramCheck - _start + EXC_OFF_SYS_RESET
1392 li r7, .L_FPUnavailable - _start + EXC_OFF_SYS_RESET
1393 li r8, SystemCall - _start + EXC_OFF_SYS_RESET
1396 addi r7, r7, 0x100 /* next exception vector */
1400 li r7, .L_SingleStep - _start + EXC_OFF_SYS_RESET
1401 li r8, _end_of_vectors - _start + EXC_OFF_SYS_RESET
1404 addi r7, r7, 0x100 /* next exception vector */
1408 #if !defined(CONFIG_440_GX)
1409 addi r7,r0,0x1000 /* set ME bit (Machine Exceptions) */
1410 oris r7,r7,0x0002 /* set CE bit (Critical Exceptions) */
1411 mtmsr r7 /* change MSR */
1414 b __440gx_msr_continue
1417 addi r7,r0,0x1000 /* set ME bit (Machine Exceptions) */
1418 oris r7,r7,0x0002 /* set CE bit (Critical Exceptions) */
1423 __440gx_msr_continue:
1426 mtlr r4 /* restore link register */
1430 * Function: relocate entries for one exception vector
1433 lwz r0, 0(r7) /* hdlr ... */
1434 add r0, r0, r3 /* ... += dest_addr */
1437 lwz r0, 4(r7) /* int_return ... */
1438 add r0, r0, r3 /* ... += dest_addr */
1444 /**************************************************************************/
1445 /* PPC405EP specific stuff */
1446 /**************************************************************************/
1450 #ifdef CONFIG_BUBINGA
1452 * Initialize EBC chip selects 1 & 4 and GPIO pins (for alternate
1453 * function) to support FPGA and NVRAM accesses below.
1456 lis r3,GPIO0_OSRH@h /* config GPIO output select */
1457 ori r3,r3,GPIO0_OSRH@l
1458 lis r4,CFG_GPIO0_OSRH@h
1459 ori r4,r4,CFG_GPIO0_OSRH@l
1462 ori r3,r3,GPIO0_OSRL@l
1463 lis r4,CFG_GPIO0_OSRL@h
1464 ori r4,r4,CFG_GPIO0_OSRL@l
1467 lis r3,GPIO0_ISR1H@h /* config GPIO input select */
1468 ori r3,r3,GPIO0_ISR1H@l
1469 lis r4,CFG_GPIO0_ISR1H@h
1470 ori r4,r4,CFG_GPIO0_ISR1H@l
1472 lis r3,GPIO0_ISR1L@h
1473 ori r3,r3,GPIO0_ISR1L@l
1474 lis r4,CFG_GPIO0_ISR1L@h
1475 ori r4,r4,CFG_GPIO0_ISR1L@l
1478 lis r3,GPIO0_TSRH@h /* config GPIO three-state select */
1479 ori r3,r3,GPIO0_TSRH@l
1480 lis r4,CFG_GPIO0_TSRH@h
1481 ori r4,r4,CFG_GPIO0_TSRH@l
1484 ori r3,r3,GPIO0_TSRL@l
1485 lis r4,CFG_GPIO0_TSRL@h
1486 ori r4,r4,CFG_GPIO0_TSRL@l
1489 lis r3,GPIO0_TCR@h /* config GPIO driver output enables */
1490 ori r3,r3,GPIO0_TCR@l
1491 lis r4,CFG_GPIO0_TCR@h
1492 ori r4,r4,CFG_GPIO0_TCR@l
1495 li r3,pb1ap /* program EBC bank 1 for RTC access */
1497 lis r3,CFG_EBC_PB1AP@h
1498 ori r3,r3,CFG_EBC_PB1AP@l
1502 lis r3,CFG_EBC_PB1CR@h
1503 ori r3,r3,CFG_EBC_PB1CR@l
1506 li r3,pb1ap /* program EBC bank 1 for RTC access */
1508 lis r3,CFG_EBC_PB1AP@h
1509 ori r3,r3,CFG_EBC_PB1AP@l
1513 lis r3,CFG_EBC_PB1CR@h
1514 ori r3,r3,CFG_EBC_PB1CR@l
1517 li r3,pb4ap /* program EBC bank 4 for FPGA access */
1519 lis r3,CFG_EBC_PB4AP@h
1520 ori r3,r3,CFG_EBC_PB4AP@l
1524 lis r3,CFG_EBC_PB4CR@h
1525 ori r3,r3,CFG_EBC_PB4CR@l
1529 addi r3,0,CPC0_PCI_HOST_CFG_EN
1530 #ifdef CONFIG_BUBINGA
1532 !-----------------------------------------------------------------------
1533 ! Check FPGA for PCI internal/external arbitration
1534 ! If board is set to internal arbitration, update cpc0_pci
1535 !-----------------------------------------------------------------------
1537 addis r5,r0,FPGA_REG1@h /* set offset for FPGA_REG1 */
1538 ori r5,r5,FPGA_REG1@l
1539 lbz r5,0x0(r5) /* read to get PCI arb selection */
1540 andi. r6,r5,FPGA_REG1_PCI_INT_ARB /* using internal arbiter ?*/
1541 beq ..pci_cfg_set /* if not set, then bypass reg write*/
1543 ori r3,r3,CPC0_PCI_ARBIT_EN
1545 mtdcr CPC0_PCI, r3 /* Enable internal arbiter*/
1548 !-----------------------------------------------------------------------
1549 ! Check to see if chip is in bypass mode.
1550 ! If so, write stored CPC0_PLLMR0 and CPC0_PLLMR1 values and perform a
1551 ! CPU reset Otherwise, skip this step and keep going.
1552 ! Note: Running BIOS in bypass mode is not supported since PLB speed
1553 ! will not be fast enough for the SDRAM (min 66MHz)
1554 !-----------------------------------------------------------------------
1556 mfdcr r5, CPC0_PLLMR1
1557 rlwinm r4,r5,1,0x1 /* get system clock source (SSCS) */
1560 beq pll_done /* if SSCS =b'1' then PLL has */
1561 /* already been set */
1562 /* and CPU has been reset */
1563 /* so skip to next section */
1565 #ifdef CONFIG_BUBINGA
1567 !-----------------------------------------------------------------------
1568 ! Read NVRAM to get value to write in PLLMR.
1569 ! If value has not been correctly saved, write default value
1570 ! Default config values (assuming on-board 33MHz SYS_CLK) are above.
1571 ! See CPU_DEFAULT_200 and CPU_DEFAULT_266 above.
1573 ! WARNING: This code assumes the first three words in the nvram_t
1574 ! structure in openbios.h. Changing the beginning of
1575 ! the structure will break this code.
1577 !-----------------------------------------------------------------------
1579 addis r3,0,NVRAM_BASE@h
1580 addi r3,r3,NVRAM_BASE@l
1583 addis r5,0,NVRVFY1@h
1584 addi r5,r5,NVRVFY1@l
1585 cmp cr0,0,r4,r5 /* Compare 1st NVRAM Magic number*/
1589 addis r5,0,NVRVFY2@h
1590 addi r5,r5,NVRVFY2@l
1591 cmp cr0,0,r4,r5 /* Compare 2 NVRAM Magic number */
1593 addi r3,r3,8 /* Skip over conf_size */
1594 lwz r4, 4(r3) /* Load PLLMR1 value from NVRAM */
1595 lwz r3, 0(r3) /* Load PLLMR0 value from NVRAM */
1596 rlwinm r5,r4,1,0x1 /* get system clock source (SSCS) */
1597 cmpi cr0,0,r5,1 /* See if PLL is locked */
1600 #endif /* CONFIG_BUBINGA */
1602 addis r3,0,PLLMR0_DEFAULT@h /* PLLMR0 default value */
1603 ori r3,r3,PLLMR0_DEFAULT@l /* */
1604 addis r4,0,PLLMR1_DEFAULT@h /* PLLMR1 default value */
1605 ori r4,r4,PLLMR1_DEFAULT@l /* */
1607 b pll_write /* Write the CPC0_PLLMR with new value */
1611 !-----------------------------------------------------------------------
1612 ! Clear Soft Reset Register
1613 ! This is needed to enable PCI if not booting from serial EPROM
1614 !-----------------------------------------------------------------------
1624 blr /* return to main code */
1627 !-----------------------------------------------------------------------------
1628 ! Function: pll_write
1629 ! Description: Updates the value of the CPC0_PLLMR according to CMOS27E documentation
1631 ! 1. Pll is first disabled (de-activated by putting in bypass mode)
1633 ! 3. Clock dividers are set while PLL is held in reset and bypassed
1634 ! 4. PLL Reset is cleared
1635 ! 5. Wait 100us for PLL to lock
1636 ! 6. A core reset is performed
1637 ! Input: r3 = Value to write to CPC0_PLLMR0
1638 ! Input: r4 = Value to write to CPC0_PLLMR1
1640 !-----------------------------------------------------------------------------
1645 ori r5,r5,0x0101 /* Stop the UART clocks */
1646 mtdcr CPC0_UCR,r5 /* Before changing PLL */
1648 mfdcr r5, CPC0_PLLMR1
1649 rlwinm r5,r5,0,0x7FFFFFFF /* Disable PLL */
1650 mtdcr CPC0_PLLMR1,r5
1651 oris r5,r5,0x4000 /* Set PLL Reset */
1652 mtdcr CPC0_PLLMR1,r5
1654 mtdcr CPC0_PLLMR0,r3 /* Set clock dividers */
1655 rlwinm r5,r4,0,0x3FFFFFFF /* Reset & Bypass new PLL dividers */
1656 oris r5,r5,0x4000 /* Set PLL Reset */
1657 mtdcr CPC0_PLLMR1,r5 /* Set clock dividers */
1658 rlwinm r5,r5,0,0xBFFFFFFF /* Clear PLL Reset */
1659 mtdcr CPC0_PLLMR1,r5
1662 ! Wait min of 100us for PLL to lock.
1663 ! See CMOS 27E databook for more info.
1664 ! At 200MHz, that means waiting 20,000 instructions
1666 addi r3,0,20000 /* 2000 = 0x4e20 */
1671 oris r5,r5,0x8000 /* Enable PLL */
1672 mtdcr CPC0_PLLMR1,r5 /* Engage */
1675 * Reset CPU to guarantee timings are OK
1676 * Not sure if this is needed...
1679 mtspr dbcr0,r3 /* This will cause a CPU core reset, and */
1680 /* execution will continue from the poweron */
1681 /* vector of 0xfffffffc */
1682 #endif /* CONFIG_405EP */