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
120 #ifdef CONFIG_NAND_U_BOOT
121 .extern reconfig_tlb0
125 * Set up GOT: Global Offset Table
127 * Use r14 to access the GOT
129 #if !defined(CONFIG_NAND_SPL)
131 GOT_ENTRY(_GOT2_TABLE_)
132 GOT_ENTRY(_FIXUP_TABLE_)
135 GOT_ENTRY(_start_of_vectors)
136 GOT_ENTRY(_end_of_vectors)
137 GOT_ENTRY(transfer_to_handler)
139 GOT_ENTRY(__init_end)
141 GOT_ENTRY(__bss_start)
143 #endif /* CONFIG_NAND_SPL */
145 #if defined(CONFIG_NAND_U_BOOT) && !defined(CONFIG_NAND_SPL)
147 * NAND U-Boot image is started from offset 0
152 bl cpu_init_f /* run low-level CPU init code (from Flash) */
157 * 440 Startup -- on reset only the top 4k of the effective
158 * address space is mapped in by an entry in the instruction
159 * and data shadow TLB. The .bootpg section is located in the
160 * top 4k & does only what's necessary to map in the the rest
161 * of the boot rom. Once the boot rom is mapped in we can
162 * proceed with normal startup.
164 * NOTE: CS0 only covers the top 2MB of the effective address
168 #if defined(CONFIG_440)
169 #if !defined(CONFIG_NAND_SPL)
170 .section .bootpg,"ax"
174 /**************************************************************************/
176 /*--------------------------------------------------------------------+
177 | 440EPX BUP Change - Hardware team request
178 +--------------------------------------------------------------------*/
179 #if defined(CONFIG_440EPX) || defined(CONFIG_440GRX)
184 /*----------------------------------------------------------------+
185 | Core bug fix. Clear the esr
186 +-----------------------------------------------------------------*/
189 /*----------------------------------------------------------------*/
190 /* Clear and set up some registers. */
191 /*----------------------------------------------------------------*/
192 iccci r0,r0 /* NOTE: operands not used for 440 */
193 dccci r0,r0 /* NOTE: operands not used for 440 */
200 /* NOTE: 440GX adds machine check status regs */
201 #if defined(CONFIG_440) && !defined(CONFIG_440GP)
207 /*----------------------------------------------------------------*/
208 /* Initialize debug */
209 /*----------------------------------------------------------------*/
211 andis. r1, r1, 0x8000 /* test DBCR0[EDM] bit */
212 bne skip_debug_init /* if set, don't clear debug register */
225 mtspr dbsr,r1 /* Clear all valid bits */
228 /*----------------------------------------------------------------*/
230 /*----------------------------------------------------------------*/
231 /* Disable store gathering & broadcast, guarantee inst/data
232 * cache block touch, force load/store alignment
233 * (see errata 1.12: 440_33)
235 lis r1,0x0030 /* store gathering & broadcast disable */
236 ori r1,r1,0x6000 /* cache touch */
239 #if defined (CONFIG_440SPE)
240 /*----------------------------------------------------------------+
241 | Initialize Core Configuration Reg1.
242 | a. ICDPEI: Record even parity. Normal operation.
243 | b. ICTPEI: Record even parity. Normal operation.
244 | c. DCTPEI: Record even parity. Normal operation.
245 | d. DCDPEI: Record even parity. Normal operation.
246 | e. DCUPEI: Record even parity. Normal operation.
247 | f. DCMPEI: Record even parity. Normal operation.
248 | g. FCOM: Normal operation
249 | h. MMUPEI: Record even parity. Normal operation.
250 | i. FFF: Flush only as much data as necessary.
251 | j. TCS: Timebase increments from CPU clock.
252 +-----------------------------------------------------------------*/
256 /*----------------------------------------------------------------+
257 | Reset the timebase.
258 | The previous write to CCR1 sets the timebase source.
259 +-----------------------------------------------------------------*/
264 /*----------------------------------------------------------------*/
265 /* Setup interrupt vectors */
266 /*----------------------------------------------------------------*/
267 mtspr ivpr,r0 /* Vectors start at 0x0000_0000 */
269 mtspr ivor0,r1 /* Critical input */
271 mtspr ivor1,r1 /* Machine check */
273 mtspr ivor2,r1 /* Data storage */
275 mtspr ivor3,r1 /* Instruction storage */
277 mtspr ivor4,r1 /* External interrupt */
279 mtspr ivor5,r1 /* Alignment */
281 mtspr ivor6,r1 /* Program check */
283 mtspr ivor7,r1 /* Floating point unavailable */
285 mtspr ivor8,r1 /* System call */
287 mtspr ivor10,r1 /* Decrementer (PIT for 440) */
289 mtspr ivor13,r1 /* Data TLB error */
291 mtspr ivor14,r1 /* Instr TLB error */
293 mtspr ivor15,r1 /* Debug */
295 /*----------------------------------------------------------------*/
296 /* Configure cache regions */
297 /*----------------------------------------------------------------*/
315 /*----------------------------------------------------------------*/
316 /* Cache victim limits */
317 /*----------------------------------------------------------------*/
318 /* floors 0, ceiling max to use the entire cache -- nothing locked
325 /*----------------------------------------------------------------+
326 |Initialize MMUCR[STID] = 0.
327 +-----------------------------------------------------------------*/
334 /*----------------------------------------------------------------*/
335 /* Clear all TLB entries -- TID = 0, TS = 0 */
336 /*----------------------------------------------------------------*/
338 li r1,0x003f /* 64 TLB entries */
340 rsttlb: tlbwe r0,r1,0x0000 /* Invalidate all entries (V=0)*/
346 /*----------------------------------------------------------------*/
347 /* TLB entry setup -- step thru tlbtab */
348 /*----------------------------------------------------------------*/
349 #if defined(CONFIG_440SPE)
350 /*----------------------------------------------------------------*/
351 /* We have different TLB tables for revA and rev B of 440SPe */
352 /*----------------------------------------------------------------*/
364 bl tlbtab /* Get tlbtab pointer */
367 li r1,0x003f /* 64 TLB entries max */
374 beq 2f /* 0 marks end */
377 tlbwe r0,r4,0 /* TLB Word 0 */
378 tlbwe r1,r4,1 /* TLB Word 1 */
379 tlbwe r2,r4,2 /* TLB Word 2 */
380 addi r4,r4,1 /* Next TLB */
383 /*----------------------------------------------------------------*/
384 /* Continue from 'normal' start */
385 /*----------------------------------------------------------------*/
388 #if defined(CONFIG_NAND_SPL)
390 * Enable internal SRAM
395 and r1,r1,r2 /* Disable parity check */
398 and r1,r1,r2 /* Disable pwr mgmt */
402 * Copy SPL from cache into internal SRAM
404 li r4,(CFG_NAND_BOOT_SPL_SIZE >> 2) - 1
406 lis r2,CFG_NAND_BOOT_SPL_SRC@h
407 ori r2,r2,CFG_NAND_BOOT_SPL_SRC@l
408 lis r3,CFG_NAND_BOOT_SPL_DST@h
409 ori r3,r3,CFG_NAND_BOOT_SPL_DST@l
416 * Jump to code in RAM
420 lis r3,(CFG_NAND_BOOT_SPL_SRC - CFG_NAND_BOOT_SPL_DST)@h
421 ori r3,r3,(CFG_NAND_BOOT_SPL_SRC - CFG_NAND_BOOT_SPL_DST)@l
436 mtspr srr1,r0 /* Keep things disabled for now */
440 #endif /* CONFIG_440 */
443 * r3 - 1st arg to board_init(): IMMP pointer
444 * r4 - 2nd arg to board_init(): boot flag
446 #ifndef CONFIG_NAND_SPL
448 .long 0x27051956 /* U-Boot Magic Number */
449 .globl version_string
451 .ascii U_BOOT_VERSION
452 .ascii " (", __DATE__, " - ", __TIME__, ")"
453 .ascii CONFIG_IDENT_STRING, "\0"
456 * Maybe this should be moved somewhere else because the current
457 * location (0x100) is where the CriticalInput Execption should be.
459 . = EXC_OFF_SYS_RESET
464 /*****************************************************************************/
465 #if defined(CONFIG_440)
467 /*----------------------------------------------------------------*/
468 /* Clear and set up some registers. */
469 /*----------------------------------------------------------------*/
472 mtspr dec,r0 /* prevent dec exceptions */
473 mtspr tbl,r0 /* prevent fit & wdt exceptions */
475 mtspr tsr,r1 /* clear all timer exception status */
476 mtspr tcr,r0 /* disable all */
477 mtspr esr,r0 /* clear exception syndrome register */
478 mtxer r0 /* clear integer exception register */
480 /*----------------------------------------------------------------*/
481 /* Debug setup -- some (not very good) ice's need an event*/
482 /* to establish control :-( Define CFG_INIT_DBCR to the dbsr */
483 /* value you need in this case 0x8cff 0000 should do the trick */
484 /*----------------------------------------------------------------*/
485 #if defined(CFG_INIT_DBCR)
488 mtspr dbsr,r1 /* Clear all status bits */
489 lis r0,CFG_INIT_DBCR@h
490 ori r0,r0,CFG_INIT_DBCR@l
495 /*----------------------------------------------------------------*/
496 /* Setup the internal SRAM */
497 /*----------------------------------------------------------------*/
500 #ifdef CFG_INIT_RAM_DCACHE
501 /* Clear Dcache to use as RAM */
502 addis r3,r0,CFG_INIT_RAM_ADDR@h
503 ori r3,r3,CFG_INIT_RAM_ADDR@l
504 addis r4,r0,CFG_INIT_RAM_END@h
505 ori r4,r4,CFG_INIT_RAM_END@l
506 rlwinm. r5,r4,0,27,31
516 #endif /* CFG_INIT_RAM_DCACHE */
518 /* 440EP & 440GR are only 440er PPC's without internal SRAM */
519 #if !defined(CONFIG_440EP) && !defined(CONFIG_440GR)
520 /* not all PPC's have internal SRAM usable as L2-cache */
521 #if defined(CONFIG_440GX) || defined(CONFIG_440SP) || defined(CONFIG_440SPE)
522 mtdcr l2_cache_cfg,r0 /* Ensure L2 Cache is off */
528 and r1,r1,r2 /* Disable parity check */
531 and r1,r1,r2 /* Disable pwr mgmt */
534 lis r1,0x8000 /* BAS = 8000_0000 */
535 #if defined(CONFIG_440GX) || defined(CONFIG_440SP)
536 ori r1,r1,0x0980 /* first 64k */
537 mtdcr isram0_sb0cr,r1
539 ori r1,r1,0x0980 /* second 64k */
540 mtdcr isram0_sb1cr,r1
542 ori r1,r1, 0x0980 /* third 64k */
543 mtdcr isram0_sb2cr,r1
545 ori r1,r1, 0x0980 /* fourth 64k */
546 mtdcr isram0_sb3cr,r1
547 #elif defined(CONFIG_440SPE)
548 lis r1,0x0000 /* BAS = 0000_0000 */
549 ori r1,r1,0x0984 /* first 64k */
550 mtdcr isram0_sb0cr,r1
552 ori r1,r1,0x0984 /* second 64k */
553 mtdcr isram0_sb1cr,r1
555 ori r1,r1, 0x0984 /* third 64k */
556 mtdcr isram0_sb2cr,r1
558 ori r1,r1, 0x0984 /* fourth 64k */
559 mtdcr isram0_sb3cr,r1
560 #elif defined(CONFIG_440GP)
561 ori r1,r1,0x0380 /* 8k rw */
562 mtdcr isram0_sb0cr,r1
563 mtdcr isram0_sb1cr,r0 /* Disable bank 1 */
565 #endif /* #if !defined(CONFIG_440EP) && !defined(CONFIG_440GR) */
567 /*----------------------------------------------------------------*/
568 /* Setup the stack in internal SRAM */
569 /*----------------------------------------------------------------*/
570 lis r1,CFG_INIT_RAM_ADDR@h
571 ori r1,r1,CFG_INIT_SP_OFFSET@l
574 stwu r0,-4(r1) /* Terminate call chain */
576 stwu r1,-8(r1) /* Save back chain and move SP */
577 lis r0,RESET_VECTOR@h /* Address of reset vector */
578 ori r0,r0, RESET_VECTOR@l
579 stwu r1,-8(r1) /* Save back chain and move SP */
580 stw r0,+12(r1) /* Save return addr (underflow vect) */
582 #ifdef CONFIG_NAND_SPL
583 bl nand_boot /* will not return */
587 bl cpu_init_f /* run low-level CPU init code (from Flash) */
591 #endif /* CONFIG_440 */
593 /*****************************************************************************/
595 /*----------------------------------------------------------------------- */
596 /* Set up some machine state registers. */
597 /*----------------------------------------------------------------------- */
598 addi r0,r0,0x0000 /* initialize r0 to zero */
599 mtspr esr,r0 /* clear Exception Syndrome Reg */
600 mttcr r0 /* timer control register */
601 mtexier r0 /* disable all interrupts */
602 addis r4,r0,0xFFFF /* set r4 to 0xFFFFFFFF (status in the */
603 ori r4,r4,0xFFFF /* dbsr is cleared by setting bits to 1) */
604 mtdbsr r4 /* clear/reset the dbsr */
605 mtexisr r4 /* clear all pending interrupts */
607 mtexier r4 /* enable critical exceptions */
608 addis r4,r0,0x0000 /* assume 403GCX - enable core clk */
609 ori r4,r4,0x4020 /* dbling (no harm done on GA and GC */
610 mtiocr r4 /* since bit not used) & DRC to latch */
611 /* data bus on rising edge of CAS */
612 /*----------------------------------------------------------------------- */
614 /*----------------------------------------------------------------------- */
616 /*----------------------------------------------------------------------- */
617 /* Invalidate i-cache and d-cache TAG arrays. */
618 /*----------------------------------------------------------------------- */
619 addi r3,0,1024 /* 1/4 of I-cache size, half of D-cache */
620 addi r4,0,1024 /* 1/4 of I-cache */
625 addic. r3,r3,-16 /* move back one cache line */
626 bne ..cloop /* loop back to do rest until r3 = 0 */
629 /* initialize IOP480 so it can read 1 MB code area for SRAM spaces */
630 /* this requires enabling MA[17..0], by default only MA[12..0] are enabled. */
633 /* first copy IOP480 register base address into r3 */
634 addis r3,0,0x5000 /* IOP480 register base address hi */
635 /* ori r3,r3,0x0000 / IOP480 register base address lo */
638 /* use r4 as the working variable */
639 /* turn on CS3 (LOCCTL.7) */
640 lwz r4,0x84(r3) /* LOCTL is at offset 0x84 */
641 andi. r4,r4,0xff7f /* make bit 7 = 0 -- CS3 mode */
642 stw r4,0x84(r3) /* LOCTL is at offset 0x84 */
645 #ifdef CONFIG_DASA_SIM
646 /* use r4 as the working variable */
647 /* turn on MA17 (LOCCTL.7) */
648 lwz r4,0x84(r3) /* LOCTL is at offset 0x84 */
649 ori r4,r4,0x80 /* make bit 7 = 1 -- MA17 mode */
650 stw r4,0x84(r3) /* LOCTL is at offset 0x84 */
653 /* turn on MA16..13 (LCS0BRD.12 = 0) */
654 lwz r4,0x100(r3) /* LCS0BRD is at offset 0x100 */
655 andi. r4,r4,0xefff /* make bit 12 = 0 */
656 stw r4,0x100(r3) /* LCS0BRD is at offset 0x100 */
658 /* make sure above stores all comlete before going on */
661 /* last thing, set local init status done bit (DEVINIT.31) */
662 lwz r4,0x80(r3) /* DEVINIT is at offset 0x80 */
663 oris r4,r4,0x8000 /* make bit 31 = 1 */
664 stw r4,0x80(r3) /* DEVINIT is at offset 0x80 */
666 /* clear all pending interrupts and disable all interrupts */
667 li r4,-1 /* set p1 to 0xffffffff */
668 stw r4,0x1b0(r3) /* clear all pending interrupts */
669 stw r4,0x1b8(r3) /* clear all pending interrupts */
670 li r4,0 /* set r4 to 0 */
671 stw r4,0x1b4(r3) /* disable all interrupts */
672 stw r4,0x1bc(r3) /* disable all interrupts */
674 /* make sure above stores all comlete before going on */
677 /*----------------------------------------------------------------------- */
678 /* Enable two 128MB cachable regions. */
679 /*----------------------------------------------------------------------- */
682 mticcr r1 /* instruction cache */
686 mtdccr r1 /* data cache */
688 addis r1,r0,CFG_INIT_RAM_ADDR@h
689 ori r1,r1,CFG_INIT_SP_OFFSET /* set up the stack to SDRAM */
690 li r0, 0 /* Make room for stack frame header and */
691 stwu r0, -4(r1) /* clear final stack frame so that */
692 stwu r0, -4(r1) /* stack backtraces terminate cleanly */
694 GET_GOT /* initialize GOT access */
696 bl board_init_f /* run first part of init code (from Flash) */
698 #endif /* CONFIG_IOP480 */
700 /*****************************************************************************/
701 #if defined(CONFIG_405GP) || defined(CONFIG_405CR) || defined(CONFIG_405) || defined(CONFIG_405EP)
702 /*----------------------------------------------------------------------- */
703 /* Clear and set up some registers. */
704 /*----------------------------------------------------------------------- */
708 mtesr r4 /* clear Exception Syndrome Reg */
709 mttcr r4 /* clear Timer Control Reg */
710 mtxer r4 /* clear Fixed-Point Exception Reg */
711 mtevpr r4 /* clear Exception Vector Prefix Reg */
712 addi r4,r0,(0xFFFF-0x10000) /* set r4 to 0xFFFFFFFF (status in the */
713 /* dbsr is cleared by setting bits to 1) */
714 mtdbsr r4 /* clear/reset the dbsr */
716 /*----------------------------------------------------------------------- */
717 /* Invalidate I and D caches. Enable I cache for defined memory regions */
718 /* to speed things up. Leave the D cache disabled for now. It will be */
719 /* enabled/left disabled later based on user selected menu options. */
720 /* Be aware that the I cache may be disabled later based on the menu */
721 /* options as well. See miscLib/main.c. */
722 /*----------------------------------------------------------------------- */
726 /*----------------------------------------------------------------------- */
727 /* Enable two 128MB cachable regions. */
728 /*----------------------------------------------------------------------- */
731 mticcr r4 /* instruction cache */
736 mtdccr r4 /* data cache */
738 #if !(defined(CFG_EBC_PB0AP) && defined(CFG_EBC_PB0CR))
739 /*----------------------------------------------------------------------- */
740 /* Tune the speed and size for flash CS0 */
741 /*----------------------------------------------------------------------- */
742 bl ext_bus_cntlr_init
745 #if defined(CONFIG_405EP)
746 /*----------------------------------------------------------------------- */
747 /* DMA Status, clear to come up clean */
748 /*----------------------------------------------------------------------- */
749 addis r3,r0, 0xFFFF /* Clear all existing DMA status */
753 bl ppc405ep_init /* do ppc405ep specific init */
754 #endif /* CONFIG_405EP */
756 #if defined(CFG_OCM_DATA_ADDR) && defined(CFG_OCM_DATA_SIZE)
757 /********************************************************************
758 * Setup OCM - On Chip Memory
759 *******************************************************************/
763 mfdcr r3, ocmiscntl /* get instr-side IRAM config */
764 mfdcr r4, ocmdscntl /* get data-side IRAM config */
765 and r3, r3, r0 /* disable data-side IRAM */
766 and r4, r4, r0 /* disable data-side IRAM */
767 mtdcr ocmiscntl, r3 /* set instr-side IRAM config */
768 mtdcr ocmdscntl, r4 /* set data-side IRAM config */
771 addis r3, 0, CFG_OCM_DATA_ADDR@h /* OCM location */
773 addis r4, 0, 0xC000 /* OCM data area enabled */
778 /*----------------------------------------------------------------------- */
779 /* Setup temporary stack in DCACHE or OCM if needed for SDRAM SPD. */
780 /*----------------------------------------------------------------------- */
781 #ifdef CFG_INIT_DCACHE_CS
782 /*----------------------------------------------------------------------- */
783 /* Memory Bank x (nothingness) initialization 1GB+64MEG */
784 /* used as temporary stack pointer for stage0 */
785 /*----------------------------------------------------------------------- */
798 /* turn on data chache for this region */
802 /* set stack pointer and clear stack to known value */
804 lis r1,CFG_INIT_RAM_ADDR@h
805 ori r1,r1,CFG_INIT_SP_OFFSET@l
807 li r4,2048 /* we store 2048 words to stack */
810 lis r2,CFG_INIT_RAM_ADDR@h /* we also clear data area */
811 ori r2,r2,CFG_INIT_RAM_END@l /* so cant copy value from r1 */
813 lis r4,0xdead /* we store 0xdeaddead in the stack */
820 li r0, 0 /* Make room for stack frame header and */
821 stwu r0, -4(r1) /* clear final stack frame so that */
822 stwu r0, -4(r1) /* stack backtraces terminate cleanly */
824 * Set up a dummy frame to store reset vector as return address.
825 * this causes stack underflow to reset board.
827 stwu r1, -8(r1) /* Save back chain and move SP */
828 addis r0, 0, RESET_VECTOR@h /* Address of reset vector */
829 ori r0, r0, RESET_VECTOR@l
830 stwu r1, -8(r1) /* Save back chain and move SP */
831 stw r0, +12(r1) /* Save return addr (underflow vect) */
833 #elif defined(CFG_TEMP_STACK_OCM) && \
834 (defined(CFG_OCM_DATA_ADDR) && defined(CFG_OCM_DATA_SIZE))
839 /* Set up Stack at top of OCM */
840 lis r1, (CFG_INIT_RAM_ADDR + CFG_INIT_SP_OFFSET)@h
841 ori r1, r1, (CFG_INIT_RAM_ADDR + CFG_INIT_SP_OFFSET)@l
843 /* Set up a zeroized stack frame so that backtrace works right */
849 * Set up a dummy frame to store reset vector as return address.
850 * this causes stack underflow to reset board.
852 stwu r1, -8(r1) /* Save back chain and move SP */
853 lis r0, RESET_VECTOR@h /* Address of reset vector */
854 ori r0, r0, RESET_VECTOR@l
855 stwu r1, -8(r1) /* Save back chain and move SP */
856 stw r0, +12(r1) /* Save return addr (underflow vect) */
857 #endif /* CFG_INIT_DCACHE_CS */
859 /*----------------------------------------------------------------------- */
860 /* Initialize SDRAM Controller */
861 /*----------------------------------------------------------------------- */
865 * Setup temporary stack pointer only for boards
866 * that do not use SDRAM SPD I2C stuff since it
867 * is already initialized to use DCACHE or OCM
870 #if !(defined(CFG_INIT_DCACHE_CS) || defined(CFG_TEMP_STACK_OCM))
871 lis r1, CFG_INIT_RAM_ADDR@h
872 ori r1,r1,CFG_INIT_SP_OFFSET /* set up the stack in SDRAM */
874 li r0, 0 /* Make room for stack frame header and */
875 stwu r0, -4(r1) /* clear final stack frame so that */
876 stwu r0, -4(r1) /* stack backtraces terminate cleanly */
878 * Set up a dummy frame to store reset vector as return address.
879 * this causes stack underflow to reset board.
881 stwu r1, -8(r1) /* Save back chain and move SP */
882 lis r0, RESET_VECTOR@h /* Address of reset vector */
883 ori r0, r0, RESET_VECTOR@l
884 stwu r1, -8(r1) /* Save back chain and move SP */
885 stw r0, +12(r1) /* Save return addr (underflow vect) */
886 #endif /* !(CFG_INIT_DCACHE_CS || !CFG_TEM_STACK_OCM) */
888 GET_GOT /* initialize GOT access */
890 bl cpu_init_f /* run low-level CPU init code (from Flash) */
893 bl board_init_f /* run first part of init code (from Flash) */
895 #endif /* CONFIG_405GP || CONFIG_405CR || CONFIG_405 || CONFIG_405EP */
896 /*----------------------------------------------------------------------- */
899 #ifndef CONFIG_NAND_SPL
900 /*****************************************************************************/
901 .globl _start_of_vectors
905 /*TODO Fixup _start above so we can do this*/
906 /* Critical input. */
907 CRIT_EXCEPTION(0x100, CritcalInput, CritcalInputException)
911 CRIT_EXCEPTION(0x200, MachineCheck, MachineCheckException)
913 /* Data Storage exception. */
914 STD_EXCEPTION(0x300, DataStorage, UnknownException)
916 /* Instruction Storage exception. */
917 STD_EXCEPTION(0x400, InstStorage, UnknownException)
919 /* External Interrupt exception. */
920 STD_EXCEPTION(0x500, ExtInterrupt, external_interrupt)
922 /* Alignment exception. */
930 addi r3,r1,STACK_FRAME_OVERHEAD
932 rlwimi r20,r23,0,16,16 /* copy EE bit from saved MSR */
933 lwz r6,GOT(transfer_to_handler)
937 .long AlignmentException - _start + EXC_OFF_SYS_RESET
938 .long int_return - _start + EXC_OFF_SYS_RESET
940 /* Program check exception */
944 addi r3,r1,STACK_FRAME_OVERHEAD
946 rlwimi r20,r23,0,16,16 /* copy EE bit from saved MSR */
947 lwz r6,GOT(transfer_to_handler)
951 .long ProgramCheckException - _start + EXC_OFF_SYS_RESET
952 .long int_return - _start + EXC_OFF_SYS_RESET
954 /* No FPU on MPC8xx. This exception is not supposed to happen.
956 STD_EXCEPTION(0x800, FPUnavailable, UnknownException)
958 /* I guess we could implement decrementer, and may have
959 * to someday for timekeeping.
961 STD_EXCEPTION(0x900, Decrementer, timer_interrupt)
962 STD_EXCEPTION(0xa00, Trap_0a, UnknownException)
963 STD_EXCEPTION(0xb00, Trap_0b, UnknownException)
964 STD_EXCEPTION(0xc00, SystemCall, UnknownException)
965 STD_EXCEPTION(0xd00, SingleStep, UnknownException)
967 STD_EXCEPTION(0xe00, Trap_0e, UnknownException)
968 STD_EXCEPTION(0xf00, Trap_0f, UnknownException)
970 /* On the MPC8xx, this is a software emulation interrupt. It occurs
971 * for all unimplemented and illegal instructions.
973 STD_EXCEPTION(0x1000, PIT, PITException)
975 STD_EXCEPTION(0x1100, InstructionTLBMiss, UnknownException)
976 STD_EXCEPTION(0x1200, DataTLBMiss, UnknownException)
977 STD_EXCEPTION(0x1300, InstructionTLBError, UnknownException)
978 STD_EXCEPTION(0x1400, DataTLBError, UnknownException)
980 STD_EXCEPTION(0x1500, Reserved5, UnknownException)
981 STD_EXCEPTION(0x1600, Reserved6, UnknownException)
982 STD_EXCEPTION(0x1700, Reserved7, UnknownException)
983 STD_EXCEPTION(0x1800, Reserved8, UnknownException)
984 STD_EXCEPTION(0x1900, Reserved9, UnknownException)
985 STD_EXCEPTION(0x1a00, ReservedA, UnknownException)
986 STD_EXCEPTION(0x1b00, ReservedB, UnknownException)
988 STD_EXCEPTION(0x1c00, DataBreakpoint, UnknownException)
989 STD_EXCEPTION(0x1d00, InstructionBreakpoint, UnknownException)
990 STD_EXCEPTION(0x1e00, PeripheralBreakpoint, UnknownException)
991 STD_EXCEPTION(0x1f00, DevPortBreakpoint, UnknownException)
993 CRIT_EXCEPTION(0x2000, DebugBreakpoint, DebugException )
995 .globl _end_of_vectors
1002 * This code finishes saving the registers to the exception frame
1003 * and jumps to the appropriate handler for the exception.
1004 * Register r21 is pointer into trap frame, r1 has new stack pointer.
1006 .globl transfer_to_handler
1007 transfer_to_handler:
1017 andi. r23,r23,MSR_PR
1018 mfspr r23,SPRG3 /* if from user, fix up tss.regs */
1020 addi r24,r1,STACK_FRAME_OVERHEAD
1021 stw r24,PT_REGS(r23)
1022 2: addi r2,r23,-TSS /* set r2 to current */
1026 andi. r24,r23,0x3f00 /* get vector offset */
1030 mtspr SPRG2,r22 /* r1 is now kernel sp */
1032 addi r24,r2,TASK_STRUCT_SIZE /* check for kernel stack overflow */
1036 bgt stack_ovf /* if r2 < r1 < r2+TASK_STRUCT_SIZE */
1038 lwz r24,0(r23) /* virtual address of handler */
1039 lwz r23,4(r23) /* where to go when done */
1044 rfi /* jump to handler, enable MMU */
1047 mfmsr r28 /* Disable interrupts */
1051 SYNC /* Some chip revs need this... */
1066 lwz r2,_NIP(r1) /* Restore environment */
1077 mfmsr r28 /* Disable interrupts */
1081 SYNC /* Some chip revs need this... */
1096 lwz r2,_NIP(r1) /* Restore environment */
1098 mtspr 990,r2 /* SRR2 */
1099 mtspr 991,r0 /* SRR3 */
1105 #endif /* CONFIG_NAND_SPL */
1110 iccci r0,r0 /* for 405, iccci invalidates the */
1111 blr /* entire I cache */
1114 addi r6,0,0x0000 /* clear GPR 6 */
1115 /* Do loop for # of dcache congruence classes. */
1116 lis r7, (CFG_DCACHE_SIZE / CFG_CACHELINE_SIZE / 2)@ha /* TBS for large sized cache */
1117 ori r7, r7, (CFG_DCACHE_SIZE / CFG_CACHELINE_SIZE / 2)@l
1118 /* NOTE: dccci invalidates both */
1119 mtctr r7 /* ways in the D cache */
1121 dccci 0,r6 /* invalidate line */
1122 addi r6,r6, CFG_CACHELINE_SIZE /* bump to next line */
1127 addis r9,r0,0x0002 /* set mask for EE and CE msr bits */
1129 mfmsr r12 /* save msr */
1131 mtmsr r9 /* disable EE and CE */
1132 addi r10,r0,0x0001 /* enable data cache for unused memory */
1133 mfdccr r9 /* region 0xF8000000-0xFFFFFFFF via */
1134 or r10,r10,r9 /* bit 31 in dccr */
1137 /* do loop for # of congruence classes. */
1138 lis r10,(CFG_DCACHE_SIZE / CFG_CACHELINE_SIZE / 2)@ha /* TBS: for large cache sizes */
1139 ori r10,r10,(CFG_DCACHE_SIZE / CFG_CACHELINE_SIZE / 2)@l
1140 lis r11,(CFG_DCACHE_SIZE / 2)@ha /* D cache set size - 2 way sets */
1141 ori r11,r11,(CFG_DCACHE_SIZE / 2)@l /* D cache set size - 2 way sets */
1143 addi r10,r0,(0xE000-0x10000) /* start at 0xFFFFE000 */
1144 add r11,r10,r11 /* add to get to other side of cache line */
1145 ..flush_dcache_loop:
1146 lwz r3,0(r10) /* least recently used side */
1147 lwz r3,0(r11) /* the other side */
1148 dccci r0,r11 /* invalidate both sides */
1149 addi r10,r10,CFG_CACHELINE_SIZE /* bump to next line */
1150 addi r11,r11,CFG_CACHELINE_SIZE /* bump to next line */
1151 bdnz ..flush_dcache_loop
1152 sync /* allow memory access to complete */
1153 mtdccr r9 /* restore dccr */
1154 mtmsr r12 /* restore msr */
1157 .globl icache_enable
1160 bl invalidate_icache
1163 addis r3,r0, 0x8000 /* set bit 0 */
1167 .globl icache_disable
1169 addis r3,r0, 0x0000 /* clear bit 0 */
1174 .globl icache_status
1177 srwi r3, r3, 31 /* >>31 => select bit 0 */
1180 .globl dcache_enable
1183 bl invalidate_dcache
1186 addis r3,r0, 0x8000 /* set bit 0 */
1190 .globl dcache_disable
1195 addis r3,r0, 0x0000 /* clear bit 0 */
1199 .globl dcache_status
1202 srwi r3, r3, 31 /* >>31 => select bit 0 */
1210 #if !defined(CONFIG_440)
1222 /*------------------------------------------------------------------------------- */
1224 /* Description: Input 8 bits */
1225 /*------------------------------------------------------------------------------- */
1231 /*------------------------------------------------------------------------------- */
1232 /* Function: out8 */
1233 /* Description: Output 8 bits */
1234 /*------------------------------------------------------------------------------- */
1240 /*------------------------------------------------------------------------------- */
1241 /* Function: out16 */
1242 /* Description: Output 16 bits */
1243 /*------------------------------------------------------------------------------- */
1249 /*------------------------------------------------------------------------------- */
1250 /* Function: out16r */
1251 /* Description: Byte reverse and output 16 bits */
1252 /*------------------------------------------------------------------------------- */
1258 /*------------------------------------------------------------------------------- */
1259 /* Function: out32 */
1260 /* Description: Output 32 bits */
1261 /*------------------------------------------------------------------------------- */
1267 /*------------------------------------------------------------------------------- */
1268 /* Function: out32r */
1269 /* Description: Byte reverse and output 32 bits */
1270 /*------------------------------------------------------------------------------- */
1276 /*------------------------------------------------------------------------------- */
1277 /* Function: in16 */
1278 /* Description: Input 16 bits */
1279 /*------------------------------------------------------------------------------- */
1285 /*------------------------------------------------------------------------------- */
1286 /* Function: in16r */
1287 /* Description: Input 16 bits and byte reverse */
1288 /*------------------------------------------------------------------------------- */
1294 /*------------------------------------------------------------------------------- */
1295 /* Function: in32 */
1296 /* Description: Input 32 bits */
1297 /*------------------------------------------------------------------------------- */
1303 /*------------------------------------------------------------------------------- */
1304 /* Function: in32r */
1305 /* Description: Input 32 bits and byte reverse */
1306 /*------------------------------------------------------------------------------- */
1312 /*------------------------------------------------------------------------------- */
1313 /* Function: ppcDcbf */
1314 /* Description: Data Cache block flush */
1315 /* Input: r3 = effective address */
1317 /*------------------------------------------------------------------------------- */
1323 /*------------------------------------------------------------------------------- */
1324 /* Function: ppcDcbi */
1325 /* Description: Data Cache block Invalidate */
1326 /* Input: r3 = effective address */
1328 /*------------------------------------------------------------------------------- */
1334 /*------------------------------------------------------------------------------- */
1335 /* Function: ppcSync */
1336 /* Description: Processor Synchronize */
1339 /*------------------------------------------------------------------------------- */
1345 /*------------------------------------------------------------------------------*/
1347 #ifndef CONFIG_NAND_SPL
1349 * void relocate_code (addr_sp, gd, addr_moni)
1351 * This "function" does not return, instead it continues in RAM
1352 * after relocating the monitor code.
1356 * r5 = length in bytes
1357 * r6 = cachelinesize
1359 .globl relocate_code
1361 #if defined(CONFIG_440EP) || defined(CONFIG_440GR) || \
1362 defined(CONFIG_440EPX) || defined(CONFIG_440GRX) || \
1363 defined(CONFIG_440SPE)
1365 * On some 440er platforms the cache is enabled in the first TLB (Boot-CS)
1366 * to speed up the boot process. Now this cache needs to be disabled.
1368 iccci 0,0 /* Invalidate inst cache */
1369 dccci 0,0 /* Invalidate data cache, now no longer our stack */
1372 addi r1,r0,0x0000 /* TLB entry #0 */
1373 tlbre r0,r1,0x0002 /* Read contents */
1374 ori r0,r0,0x0c00 /* Or in the inhibit, write through bit */
1375 tlbwe r0,r1,0x0002 /* Save it out */
1379 mr r1, r3 /* Set new stack pointer */
1380 mr r9, r4 /* Save copy of Init Data pointer */
1381 mr r10, r5 /* Save copy of Destination Address */
1383 mr r3, r5 /* Destination Address */
1384 lis r4, CFG_MONITOR_BASE@h /* Source Address */
1385 ori r4, r4, CFG_MONITOR_BASE@l
1386 lwz r5, GOT(__init_end)
1388 li r6, CFG_CACHELINE_SIZE /* Cache Line Size */
1393 * New GOT-PTR = (old GOT-PTR - CFG_MONITOR_BASE) + Destination Address
1399 /* First our own GOT */
1401 /* the the one used by the C code */
1411 beq cr1,4f /* In place copy is not necessary */
1412 beq 7f /* Protect against 0 count */
1431 * Now flush the cache: note that we must start from a cache aligned
1432 * address. Otherwise we might miss one cache line.
1436 beq 7f /* Always flush prefetch queue in any case */
1444 sync /* Wait for all dcbst to complete on bus */
1450 7: sync /* Wait for all icbi to complete on bus */
1454 * We are done. Do not return, instead branch to second part of board
1455 * initialization, now running from RAM.
1458 addi r0, r10, in_ram - _start + EXC_OFF_SYS_RESET
1460 blr /* NEVER RETURNS! */
1465 * Relocation Function, r14 point to got2+0x8000
1467 * Adjust got2 pointers, no need to check for 0, this code
1468 * already puts a few entries in the table.
1470 li r0,__got2_entries@sectoff@l
1471 la r3,GOT(_GOT2_TABLE_)
1472 lwz r11,GOT(_GOT2_TABLE_)
1482 * Now adjust the fixups and the pointers to the fixups
1483 * in case we need to move ourselves again.
1485 2: li r0,__fixup_entries@sectoff@l
1486 lwz r3,GOT(_FIXUP_TABLE_)
1500 * Now clear BSS segment
1502 lwz r3,GOT(__bss_start)
1516 mr r3, r9 /* Init Data pointer */
1517 mr r4, r10 /* Destination Address */
1521 * Copy exception vector code to low memory
1524 * r7: source address, r8: end address, r9: target address
1529 lwz r8, GOT(_end_of_vectors)
1531 li r9, 0x100 /* reset vector always at 0x100 */
1534 bgelr /* return if r7>=r8 - just in case */
1536 mflr r4 /* save link register */
1546 * relocate `hdlr' and `int_return' entries
1548 li r7, .L_MachineCheck - _start + EXC_OFF_SYS_RESET
1549 li r8, Alignment - _start + EXC_OFF_SYS_RESET
1552 addi r7, r7, 0x100 /* next exception vector */
1556 li r7, .L_Alignment - _start + EXC_OFF_SYS_RESET
1559 li r7, .L_ProgramCheck - _start + EXC_OFF_SYS_RESET
1562 li r7, .L_FPUnavailable - _start + EXC_OFF_SYS_RESET
1563 li r8, SystemCall - _start + EXC_OFF_SYS_RESET
1566 addi r7, r7, 0x100 /* next exception vector */
1570 li r7, .L_SingleStep - _start + EXC_OFF_SYS_RESET
1571 li r8, _end_of_vectors - _start + EXC_OFF_SYS_RESET
1574 addi r7, r7, 0x100 /* next exception vector */
1578 #if !defined(CONFIG_440)
1579 addi r7,r0,0x1000 /* set ME bit (Machine Exceptions) */
1580 oris r7,r7,0x0002 /* set CE bit (Critical Exceptions) */
1581 mtmsr r7 /* change MSR */
1584 b __440_msr_continue
1587 addi r7,r0,0x1000 /* set ME bit (Machine Exceptions) */
1588 oris r7,r7,0x0002 /* set CE bit (Critical Exceptions) */
1596 mtlr r4 /* restore link register */
1600 * Function: relocate entries for one exception vector
1603 lwz r0, 0(r7) /* hdlr ... */
1604 add r0, r0, r3 /* ... += dest_addr */
1607 lwz r0, 4(r7) /* int_return ... */
1608 add r0, r0, r3 /* ... += dest_addr */
1612 #endif /* CONFIG_NAND_SPL */
1615 /**************************************************************************/
1616 /* PPC405EP specific stuff */
1617 /**************************************************************************/
1621 #ifdef CONFIG_BUBINGA
1623 * Initialize EBC chip selects 1 & 4 and GPIO pins (for alternate
1624 * function) to support FPGA and NVRAM accesses below.
1627 lis r3,GPIO0_OSRH@h /* config GPIO output select */
1628 ori r3,r3,GPIO0_OSRH@l
1629 lis r4,CFG_GPIO0_OSRH@h
1630 ori r4,r4,CFG_GPIO0_OSRH@l
1633 ori r3,r3,GPIO0_OSRL@l
1634 lis r4,CFG_GPIO0_OSRL@h
1635 ori r4,r4,CFG_GPIO0_OSRL@l
1638 lis r3,GPIO0_ISR1H@h /* config GPIO input select */
1639 ori r3,r3,GPIO0_ISR1H@l
1640 lis r4,CFG_GPIO0_ISR1H@h
1641 ori r4,r4,CFG_GPIO0_ISR1H@l
1643 lis r3,GPIO0_ISR1L@h
1644 ori r3,r3,GPIO0_ISR1L@l
1645 lis r4,CFG_GPIO0_ISR1L@h
1646 ori r4,r4,CFG_GPIO0_ISR1L@l
1649 lis r3,GPIO0_TSRH@h /* config GPIO three-state select */
1650 ori r3,r3,GPIO0_TSRH@l
1651 lis r4,CFG_GPIO0_TSRH@h
1652 ori r4,r4,CFG_GPIO0_TSRH@l
1655 ori r3,r3,GPIO0_TSRL@l
1656 lis r4,CFG_GPIO0_TSRL@h
1657 ori r4,r4,CFG_GPIO0_TSRL@l
1660 lis r3,GPIO0_TCR@h /* config GPIO driver output enables */
1661 ori r3,r3,GPIO0_TCR@l
1662 lis r4,CFG_GPIO0_TCR@h
1663 ori r4,r4,CFG_GPIO0_TCR@l
1666 li r3,pb1ap /* program EBC bank 1 for RTC access */
1668 lis r3,CFG_EBC_PB1AP@h
1669 ori r3,r3,CFG_EBC_PB1AP@l
1673 lis r3,CFG_EBC_PB1CR@h
1674 ori r3,r3,CFG_EBC_PB1CR@l
1677 li r3,pb1ap /* program EBC bank 1 for RTC access */
1679 lis r3,CFG_EBC_PB1AP@h
1680 ori r3,r3,CFG_EBC_PB1AP@l
1684 lis r3,CFG_EBC_PB1CR@h
1685 ori r3,r3,CFG_EBC_PB1CR@l
1688 li r3,pb4ap /* program EBC bank 4 for FPGA access */
1690 lis r3,CFG_EBC_PB4AP@h
1691 ori r3,r3,CFG_EBC_PB4AP@l
1695 lis r3,CFG_EBC_PB4CR@h
1696 ori r3,r3,CFG_EBC_PB4CR@l
1700 addi r3,0,CPC0_PCI_HOST_CFG_EN
1701 #ifdef CONFIG_BUBINGA
1703 !-----------------------------------------------------------------------
1704 ! Check FPGA for PCI internal/external arbitration
1705 ! If board is set to internal arbitration, update cpc0_pci
1706 !-----------------------------------------------------------------------
1708 addis r5,r0,FPGA_REG1@h /* set offset for FPGA_REG1 */
1709 ori r5,r5,FPGA_REG1@l
1710 lbz r5,0x0(r5) /* read to get PCI arb selection */
1711 andi. r6,r5,FPGA_REG1_PCI_INT_ARB /* using internal arbiter ?*/
1712 beq ..pci_cfg_set /* if not set, then bypass reg write*/
1714 ori r3,r3,CPC0_PCI_ARBIT_EN
1716 mtdcr CPC0_PCI, r3 /* Enable internal arbiter*/
1719 !-----------------------------------------------------------------------
1720 ! Check to see if chip is in bypass mode.
1721 ! If so, write stored CPC0_PLLMR0 and CPC0_PLLMR1 values and perform a
1722 ! CPU reset Otherwise, skip this step and keep going.
1723 ! Note: Running BIOS in bypass mode is not supported since PLB speed
1724 ! will not be fast enough for the SDRAM (min 66MHz)
1725 !-----------------------------------------------------------------------
1727 mfdcr r5, CPC0_PLLMR1
1728 rlwinm r4,r5,1,0x1 /* get system clock source (SSCS) */
1731 beq pll_done /* if SSCS =b'1' then PLL has */
1732 /* already been set */
1733 /* and CPU has been reset */
1734 /* so skip to next section */
1736 #ifdef CONFIG_BUBINGA
1738 !-----------------------------------------------------------------------
1739 ! Read NVRAM to get value to write in PLLMR.
1740 ! If value has not been correctly saved, write default value
1741 ! Default config values (assuming on-board 33MHz SYS_CLK) are above.
1742 ! See CPU_DEFAULT_200 and CPU_DEFAULT_266 above.
1744 ! WARNING: This code assumes the first three words in the nvram_t
1745 ! structure in openbios.h. Changing the beginning of
1746 ! the structure will break this code.
1748 !-----------------------------------------------------------------------
1750 addis r3,0,NVRAM_BASE@h
1751 addi r3,r3,NVRAM_BASE@l
1754 addis r5,0,NVRVFY1@h
1755 addi r5,r5,NVRVFY1@l
1756 cmp cr0,0,r4,r5 /* Compare 1st NVRAM Magic number*/
1760 addis r5,0,NVRVFY2@h
1761 addi r5,r5,NVRVFY2@l
1762 cmp cr0,0,r4,r5 /* Compare 2 NVRAM Magic number */
1764 addi r3,r3,8 /* Skip over conf_size */
1765 lwz r4, 4(r3) /* Load PLLMR1 value from NVRAM */
1766 lwz r3, 0(r3) /* Load PLLMR0 value from NVRAM */
1767 rlwinm r5,r4,1,0x1 /* get system clock source (SSCS) */
1768 cmpi cr0,0,r5,1 /* See if PLL is locked */
1771 #endif /* CONFIG_BUBINGA */
1773 addis r3,0,PLLMR0_DEFAULT@h /* PLLMR0 default value */
1774 ori r3,r3,PLLMR0_DEFAULT@l /* */
1775 addis r4,0,PLLMR1_DEFAULT@h /* PLLMR1 default value */
1776 ori r4,r4,PLLMR1_DEFAULT@l /* */
1778 b pll_write /* Write the CPC0_PLLMR with new value */
1782 !-----------------------------------------------------------------------
1783 ! Clear Soft Reset Register
1784 ! This is needed to enable PCI if not booting from serial EPROM
1785 !-----------------------------------------------------------------------
1795 blr /* return to main code */
1798 !-----------------------------------------------------------------------------
1799 ! Function: pll_write
1800 ! Description: Updates the value of the CPC0_PLLMR according to CMOS27E documentation
1802 ! 1. Pll is first disabled (de-activated by putting in bypass mode)
1804 ! 3. Clock dividers are set while PLL is held in reset and bypassed
1805 ! 4. PLL Reset is cleared
1806 ! 5. Wait 100us for PLL to lock
1807 ! 6. A core reset is performed
1808 ! Input: r3 = Value to write to CPC0_PLLMR0
1809 ! Input: r4 = Value to write to CPC0_PLLMR1
1811 !-----------------------------------------------------------------------------
1816 ori r5,r5,0x0101 /* Stop the UART clocks */
1817 mtdcr CPC0_UCR,r5 /* Before changing PLL */
1819 mfdcr r5, CPC0_PLLMR1
1820 rlwinm r5,r5,0,0x7FFFFFFF /* Disable PLL */
1821 mtdcr CPC0_PLLMR1,r5
1822 oris r5,r5,0x4000 /* Set PLL Reset */
1823 mtdcr CPC0_PLLMR1,r5
1825 mtdcr CPC0_PLLMR0,r3 /* Set clock dividers */
1826 rlwinm r5,r4,0,0x3FFFFFFF /* Reset & Bypass new PLL dividers */
1827 oris r5,r5,0x4000 /* Set PLL Reset */
1828 mtdcr CPC0_PLLMR1,r5 /* Set clock dividers */
1829 rlwinm r5,r5,0,0xBFFFFFFF /* Clear PLL Reset */
1830 mtdcr CPC0_PLLMR1,r5
1833 ! Wait min of 100us for PLL to lock.
1834 ! See CMOS 27E databook for more info.
1835 ! At 200MHz, that means waiting 20,000 instructions
1837 addi r3,0,20000 /* 2000 = 0x4e20 */
1842 oris r5,r5,0x8000 /* Enable PLL */
1843 mtdcr CPC0_PLLMR1,r5 /* Engage */
1846 * Reset CPU to guarantee timings are OK
1847 * Not sure if this is needed...
1850 mtspr dbcr0,r3 /* This will cause a CPU core reset, and */
1851 /* execution will continue from the poweron */
1852 /* vector of 0xfffffffc */
1853 #endif /* CONFIG_405EP */