2 * Copyright (C) 1998 Dan Malek <dmalek@jlc.net>
3 * Copyright (C) 1999 Magnus Damm <kieraypc01.p.y.kie.era.ericsson.se>
4 * Copyright (C) 2000,2001,2002 Wolfgang Denk <wd@denx.de>
5 * Copyright (C) 2007 Stefan Roese <sr@denx.de>, DENX Software Engineering
7 * See file CREDITS for list of people who contributed to this
10 * This program is free software; you can redistribute it and/or
11 * modify it under the terms of the GNU General Public License as
12 * published by the Free Software Foundation; either version 2 of
13 * the License, or (at your option) any later version.
15 * This program is distributed in the hope that it will be useful,
16 * but WITHOUT ANY WARRANTY; without even the implied warranty of
17 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
18 * GNU General Public License for more details.
20 * You should have received a copy of the GNU General Public License
21 * along with this program; if not, write to the Free Software
22 * Foundation, Inc., 59 Temple Place, Suite 330, Boston,
25 /*------------------------------------------------------------------------------+ */
27 /* This source code has been made available to you by IBM on an AS-IS */
28 /* basis. Anyone receiving this source is licensed under IBM */
29 /* copyrights to use it in any way he or she deems fit, including */
30 /* copying it, modifying it, compiling it, and redistributing it either */
31 /* with or without modifications. No license under IBM patents or */
32 /* patent applications is to be implied by the copyright license. */
34 /* Any user of this software should understand that IBM cannot provide */
35 /* technical support for this software and will not be responsible for */
36 /* any consequences resulting from the use of this software. */
38 /* Any person who transfers this source code or any derivative work */
39 /* must include the IBM copyright notice, this paragraph, and the */
40 /* preceding two paragraphs in the transferred software. */
42 /* COPYRIGHT I B M CORPORATION 1995 */
43 /* LICENSED MATERIAL - PROGRAM PROPERTY OF I B M */
44 /*------------------------------------------------------------------------------- */
46 /* U-Boot - Startup Code for AMCC 4xx PowerPC based Embedded Boards
49 * The processor starts at 0xfffffffc and the code is executed
51 * in memory, but as long we don't jump around before relocating.
52 * board_init lies at a quite high address and when the cpu has
53 * jumped there, everything is ok.
54 * This works because the cpu gives the FLASH (CS0) the whole
55 * address space at startup, and board_init lies as a echo of
56 * the flash somewhere up there in the memorymap.
58 * board_init will change CS0 to be positioned at the correct
59 * address and (s)dram will be positioned at address 0
66 #define _LINUX_CONFIG_H 1 /* avoid reading Linux autoconf.h file */
68 #include <ppc_asm.tmpl>
71 #include <asm/cache.h>
74 #ifndef CONFIG_IDENT_STRING
75 #define CONFIG_IDENT_STRING ""
78 #ifdef CFG_INIT_DCACHE_CS
79 # if (CFG_INIT_DCACHE_CS == 0)
83 # if (CFG_INIT_DCACHE_CS == 1)
87 # if (CFG_INIT_DCACHE_CS == 2)
91 # if (CFG_INIT_DCACHE_CS == 3)
95 # if (CFG_INIT_DCACHE_CS == 4)
99 # if (CFG_INIT_DCACHE_CS == 5)
103 # if (CFG_INIT_DCACHE_CS == 6)
107 # if (CFG_INIT_DCACHE_CS == 7)
111 #endif /* CFG_INIT_DCACHE_CS */
113 #define function_prolog(func_name) .text; \
117 #define function_epilog(func_name) .type func_name,@function; \
118 .size func_name,.-func_name
120 /* We don't want the MMU yet.
123 #define MSR_KERNEL ( MSR_ME ) /* Machine Check */
126 .extern ext_bus_cntlr_init
128 #ifdef CONFIG_NAND_U_BOOT
129 .extern reconfig_tlb0
133 * Set up GOT: Global Offset Table
135 * Use r14 to access the GOT
137 #if !defined(CONFIG_NAND_SPL)
139 GOT_ENTRY(_GOT2_TABLE_)
140 GOT_ENTRY(_FIXUP_TABLE_)
143 GOT_ENTRY(_start_of_vectors)
144 GOT_ENTRY(_end_of_vectors)
145 GOT_ENTRY(transfer_to_handler)
147 GOT_ENTRY(__init_end)
149 GOT_ENTRY(__bss_start)
151 #endif /* CONFIG_NAND_SPL */
153 #if defined(CONFIG_NAND_U_BOOT) && !defined(CONFIG_NAND_SPL)
155 * NAND U-Boot image is started from offset 0
160 bl cpu_init_f /* run low-level CPU init code (from Flash) */
165 * 440 Startup -- on reset only the top 4k of the effective
166 * address space is mapped in by an entry in the instruction
167 * and data shadow TLB. The .bootpg section is located in the
168 * top 4k & does only what's necessary to map in the the rest
169 * of the boot rom. Once the boot rom is mapped in we can
170 * proceed with normal startup.
172 * NOTE: CS0 only covers the top 2MB of the effective address
176 #if defined(CONFIG_440)
177 #if !defined(CONFIG_NAND_SPL)
178 .section .bootpg,"ax"
182 /**************************************************************************/
184 /*--------------------------------------------------------------------+
185 | 440EPX BUP Change - Hardware team request
186 +--------------------------------------------------------------------*/
187 #if defined(CONFIG_440EPX) || defined(CONFIG_440GRX)
192 /*----------------------------------------------------------------+
193 | Core bug fix. Clear the esr
194 +-----------------------------------------------------------------*/
197 /*----------------------------------------------------------------*/
198 /* Clear and set up some registers. */
199 /*----------------------------------------------------------------*/
200 iccci r0,r0 /* NOTE: operands not used for 440 */
201 dccci r0,r0 /* NOTE: operands not used for 440 */
208 /* NOTE: 440GX adds machine check status regs */
209 #if defined(CONFIG_440) && !defined(CONFIG_440GP)
216 /*----------------------------------------------------------------*/
218 /*----------------------------------------------------------------*/
219 /* Disable store gathering & broadcast, guarantee inst/data
220 * cache block touch, force load/store alignment
221 * (see errata 1.12: 440_33)
223 lis r1,0x0030 /* store gathering & broadcast disable */
224 ori r1,r1,0x6000 /* cache touch */
227 /*----------------------------------------------------------------*/
228 /* Initialize debug */
229 /*----------------------------------------------------------------*/
231 andis. r1, r1, 0x8000 /* test DBCR0[EDM] bit */
232 bne skip_debug_init /* if set, don't clear debug register */
245 mtspr dbsr,r1 /* Clear all valid bits */
248 #if defined (CONFIG_440SPE)
249 /*----------------------------------------------------------------+
250 | Initialize Core Configuration Reg1.
251 | a. ICDPEI: Record even parity. Normal operation.
252 | b. ICTPEI: Record even parity. Normal operation.
253 | c. DCTPEI: Record even parity. Normal operation.
254 | d. DCDPEI: Record even parity. Normal operation.
255 | e. DCUPEI: Record even parity. Normal operation.
256 | f. DCMPEI: Record even parity. Normal operation.
257 | g. FCOM: Normal operation
258 | h. MMUPEI: Record even parity. Normal operation.
259 | i. FFF: Flush only as much data as necessary.
260 | j. TCS: Timebase increments from CPU clock.
261 +-----------------------------------------------------------------*/
265 /*----------------------------------------------------------------+
266 | Reset the timebase.
267 | The previous write to CCR1 sets the timebase source.
268 +-----------------------------------------------------------------*/
273 /*----------------------------------------------------------------*/
274 /* Setup interrupt vectors */
275 /*----------------------------------------------------------------*/
276 mtspr ivpr,r0 /* Vectors start at 0x0000_0000 */
278 mtspr ivor0,r1 /* Critical input */
280 mtspr ivor1,r1 /* Machine check */
282 mtspr ivor2,r1 /* Data storage */
284 mtspr ivor3,r1 /* Instruction storage */
286 mtspr ivor4,r1 /* External interrupt */
288 mtspr ivor5,r1 /* Alignment */
290 mtspr ivor6,r1 /* Program check */
292 mtspr ivor7,r1 /* Floating point unavailable */
294 mtspr ivor8,r1 /* System call */
296 mtspr ivor10,r1 /* Decrementer (PIT for 440) */
298 mtspr ivor13,r1 /* Data TLB error */
300 mtspr ivor14,r1 /* Instr TLB error */
302 mtspr ivor15,r1 /* Debug */
304 /*----------------------------------------------------------------*/
305 /* Configure cache regions */
306 /*----------------------------------------------------------------*/
324 /*----------------------------------------------------------------*/
325 /* Cache victim limits */
326 /*----------------------------------------------------------------*/
327 /* floors 0, ceiling max to use the entire cache -- nothing locked
334 /*----------------------------------------------------------------+
335 |Initialize MMUCR[STID] = 0.
336 +-----------------------------------------------------------------*/
343 /*----------------------------------------------------------------*/
344 /* Clear all TLB entries -- TID = 0, TS = 0 */
345 /*----------------------------------------------------------------*/
347 li r1,0x003f /* 64 TLB entries */
349 rsttlb: tlbwe r0,r1,0x0000 /* Invalidate all entries (V=0)*/
355 /*----------------------------------------------------------------*/
356 /* TLB entry setup -- step thru tlbtab */
357 /*----------------------------------------------------------------*/
358 #if defined(CONFIG_440SPE)
359 /*----------------------------------------------------------------*/
360 /* We have different TLB tables for revA and rev B of 440SPe */
361 /*----------------------------------------------------------------*/
373 bl tlbtab /* Get tlbtab pointer */
376 li r1,0x003f /* 64 TLB entries max */
383 beq 2f /* 0 marks end */
386 tlbwe r0,r4,0 /* TLB Word 0 */
387 tlbwe r1,r4,1 /* TLB Word 1 */
388 tlbwe r2,r4,2 /* TLB Word 2 */
389 addi r4,r4,1 /* Next TLB */
392 /*----------------------------------------------------------------*/
393 /* Continue from 'normal' start */
394 /*----------------------------------------------------------------*/
397 #if defined(CONFIG_NAND_SPL)
398 #if defined(CONFIG_440EPX) || defined(CONFIG_440GRX)
400 * Enable internal SRAM (only on 440EPx/GRx, 440EP/GR have no OCM)
405 and r1,r1,r2 /* Disable parity check */
408 and r1,r1,r2 /* Disable pwr mgmt */
411 #if defined(CONFIG_440EP)
413 * On 440EP with no internal SRAM, we setup SDRAM very early
414 * and copy the NAND_SPL to SDRAM and jump to it
416 /* Clear Dcache to use as RAM */
417 addis r3,r0,CFG_INIT_RAM_ADDR@h
418 ori r3,r3,CFG_INIT_RAM_ADDR@l
419 addis r4,r0,CFG_INIT_RAM_END@h
420 ori r4,r4,CFG_INIT_RAM_END@l
421 rlwinm. r5,r4,0,27,31
431 /*----------------------------------------------------------------*/
432 /* Setup the stack in internal SRAM */
433 /*----------------------------------------------------------------*/
434 lis r1,CFG_INIT_RAM_ADDR@h
435 ori r1,r1,CFG_INIT_SP_OFFSET@l
438 stwu r0,-4(r1) /* Terminate call chain */
440 stwu r1,-8(r1) /* Save back chain and move SP */
441 lis r0,RESET_VECTOR@h /* Address of reset vector */
442 ori r0,r0, RESET_VECTOR@l
443 stwu r1,-8(r1) /* Save back chain and move SP */
444 stw r0,+12(r1) /* Save return addr (underflow vect) */
448 #endif /* CONFIG_440EP */
451 * Copy SPL from cache into internal SRAM
453 li r4,(CFG_NAND_BOOT_SPL_SIZE >> 2) - 1
455 lis r2,CFG_NAND_BOOT_SPL_SRC@h
456 ori r2,r2,CFG_NAND_BOOT_SPL_SRC@l
457 lis r3,CFG_NAND_BOOT_SPL_DST@h
458 ori r3,r3,CFG_NAND_BOOT_SPL_DST@l
465 * Jump to code in RAM
469 lis r3,(CFG_NAND_BOOT_SPL_SRC - CFG_NAND_BOOT_SPL_DST)@h
470 ori r3,r3,(CFG_NAND_BOOT_SPL_SRC - CFG_NAND_BOOT_SPL_DST)@l
479 #endif /* CONFIG_NAND_SPL */
485 mtspr srr1,r0 /* Keep things disabled for now */
489 #endif /* CONFIG_440 */
492 * r3 - 1st arg to board_init(): IMMP pointer
493 * r4 - 2nd arg to board_init(): boot flag
495 #ifndef CONFIG_NAND_SPL
497 .long 0x27051956 /* U-Boot Magic Number */
498 .globl version_string
500 .ascii U_BOOT_VERSION
501 .ascii " (", __DATE__, " - ", __TIME__, ")"
502 .ascii CONFIG_IDENT_STRING, "\0"
505 * Maybe this should be moved somewhere else because the current
506 * location (0x100) is where the CriticalInput Execption should be.
508 . = EXC_OFF_SYS_RESET
513 /*****************************************************************************/
514 #if defined(CONFIG_440)
516 /*----------------------------------------------------------------*/
517 /* Clear and set up some registers. */
518 /*----------------------------------------------------------------*/
521 mtspr dec,r0 /* prevent dec exceptions */
522 mtspr tbl,r0 /* prevent fit & wdt exceptions */
524 mtspr tsr,r1 /* clear all timer exception status */
525 mtspr tcr,r0 /* disable all */
526 mtspr esr,r0 /* clear exception syndrome register */
527 mtxer r0 /* clear integer exception register */
529 /*----------------------------------------------------------------*/
530 /* Debug setup -- some (not very good) ice's need an event*/
531 /* to establish control :-( Define CFG_INIT_DBCR to the dbsr */
532 /* value you need in this case 0x8cff 0000 should do the trick */
533 /*----------------------------------------------------------------*/
534 #if defined(CFG_INIT_DBCR)
537 mtspr dbsr,r1 /* Clear all status bits */
538 lis r0,CFG_INIT_DBCR@h
539 ori r0,r0,CFG_INIT_DBCR@l
544 /*----------------------------------------------------------------*/
545 /* Setup the internal SRAM */
546 /*----------------------------------------------------------------*/
549 #ifdef CFG_INIT_RAM_DCACHE
550 /* Clear Dcache to use as RAM */
551 addis r3,r0,CFG_INIT_RAM_ADDR@h
552 ori r3,r3,CFG_INIT_RAM_ADDR@l
553 addis r4,r0,CFG_INIT_RAM_END@h
554 ori r4,r4,CFG_INIT_RAM_END@l
555 rlwinm. r5,r4,0,27,31
565 #endif /* CFG_INIT_RAM_DCACHE */
567 /* 440EP & 440GR are only 440er PPC's without internal SRAM */
568 #if !defined(CONFIG_440EP) && !defined(CONFIG_440GR)
569 /* not all PPC's have internal SRAM usable as L2-cache */
570 #if defined(CONFIG_440GX) || defined(CONFIG_440SP) || defined(CONFIG_440SPE)
571 mtdcr l2_cache_cfg,r0 /* Ensure L2 Cache is off */
577 and r1,r1,r2 /* Disable parity check */
580 and r1,r1,r2 /* Disable pwr mgmt */
583 lis r1,0x8000 /* BAS = 8000_0000 */
584 #if defined(CONFIG_440GX) || defined(CONFIG_440SP)
585 ori r1,r1,0x0980 /* first 64k */
586 mtdcr isram0_sb0cr,r1
588 ori r1,r1,0x0980 /* second 64k */
589 mtdcr isram0_sb1cr,r1
591 ori r1,r1, 0x0980 /* third 64k */
592 mtdcr isram0_sb2cr,r1
594 ori r1,r1, 0x0980 /* fourth 64k */
595 mtdcr isram0_sb3cr,r1
596 #elif defined(CONFIG_440SPE)
597 lis r1,0x0000 /* BAS = 0000_0000 */
598 ori r1,r1,0x0984 /* first 64k */
599 mtdcr isram0_sb0cr,r1
601 ori r1,r1,0x0984 /* second 64k */
602 mtdcr isram0_sb1cr,r1
604 ori r1,r1, 0x0984 /* third 64k */
605 mtdcr isram0_sb2cr,r1
607 ori r1,r1, 0x0984 /* fourth 64k */
608 mtdcr isram0_sb3cr,r1
609 #elif defined(CONFIG_440GP)
610 ori r1,r1,0x0380 /* 8k rw */
611 mtdcr isram0_sb0cr,r1
612 mtdcr isram0_sb1cr,r0 /* Disable bank 1 */
614 #endif /* #if !defined(CONFIG_440EP) && !defined(CONFIG_440GR) */
616 /*----------------------------------------------------------------*/
617 /* Setup the stack in internal SRAM */
618 /*----------------------------------------------------------------*/
619 lis r1,CFG_INIT_RAM_ADDR@h
620 ori r1,r1,CFG_INIT_SP_OFFSET@l
623 stwu r0,-4(r1) /* Terminate call chain */
625 stwu r1,-8(r1) /* Save back chain and move SP */
626 lis r0,RESET_VECTOR@h /* Address of reset vector */
627 ori r0,r0, RESET_VECTOR@l
628 stwu r1,-8(r1) /* Save back chain and move SP */
629 stw r0,+12(r1) /* Save return addr (underflow vect) */
631 #ifdef CONFIG_NAND_SPL
632 bl nand_boot /* will not return */
636 bl cpu_init_f /* run low-level CPU init code (from Flash) */
640 #endif /* CONFIG_440 */
642 /*****************************************************************************/
644 /*----------------------------------------------------------------------- */
645 /* Set up some machine state registers. */
646 /*----------------------------------------------------------------------- */
647 addi r0,r0,0x0000 /* initialize r0 to zero */
648 mtspr esr,r0 /* clear Exception Syndrome Reg */
649 mttcr r0 /* timer control register */
650 mtexier r0 /* disable all interrupts */
651 addis r4,r0,0xFFFF /* set r4 to 0xFFFFFFFF (status in the */
652 ori r4,r4,0xFFFF /* dbsr is cleared by setting bits to 1) */
653 mtdbsr r4 /* clear/reset the dbsr */
654 mtexisr r4 /* clear all pending interrupts */
656 mtexier r4 /* enable critical exceptions */
657 addis r4,r0,0x0000 /* assume 403GCX - enable core clk */
658 ori r4,r4,0x4020 /* dbling (no harm done on GA and GC */
659 mtiocr r4 /* since bit not used) & DRC to latch */
660 /* data bus on rising edge of CAS */
661 /*----------------------------------------------------------------------- */
663 /*----------------------------------------------------------------------- */
665 /*----------------------------------------------------------------------- */
666 /* Invalidate i-cache and d-cache TAG arrays. */
667 /*----------------------------------------------------------------------- */
668 addi r3,0,1024 /* 1/4 of I-cache size, half of D-cache */
669 addi r4,0,1024 /* 1/4 of I-cache */
674 addic. r3,r3,-16 /* move back one cache line */
675 bne ..cloop /* loop back to do rest until r3 = 0 */
678 /* initialize IOP480 so it can read 1 MB code area for SRAM spaces */
679 /* this requires enabling MA[17..0], by default only MA[12..0] are enabled. */
682 /* first copy IOP480 register base address into r3 */
683 addis r3,0,0x5000 /* IOP480 register base address hi */
684 /* ori r3,r3,0x0000 / IOP480 register base address lo */
687 /* use r4 as the working variable */
688 /* turn on CS3 (LOCCTL.7) */
689 lwz r4,0x84(r3) /* LOCTL is at offset 0x84 */
690 andi. r4,r4,0xff7f /* make bit 7 = 0 -- CS3 mode */
691 stw r4,0x84(r3) /* LOCTL is at offset 0x84 */
694 #ifdef CONFIG_DASA_SIM
695 /* use r4 as the working variable */
696 /* turn on MA17 (LOCCTL.7) */
697 lwz r4,0x84(r3) /* LOCTL is at offset 0x84 */
698 ori r4,r4,0x80 /* make bit 7 = 1 -- MA17 mode */
699 stw r4,0x84(r3) /* LOCTL is at offset 0x84 */
702 /* turn on MA16..13 (LCS0BRD.12 = 0) */
703 lwz r4,0x100(r3) /* LCS0BRD is at offset 0x100 */
704 andi. r4,r4,0xefff /* make bit 12 = 0 */
705 stw r4,0x100(r3) /* LCS0BRD is at offset 0x100 */
707 /* make sure above stores all comlete before going on */
710 /* last thing, set local init status done bit (DEVINIT.31) */
711 lwz r4,0x80(r3) /* DEVINIT is at offset 0x80 */
712 oris r4,r4,0x8000 /* make bit 31 = 1 */
713 stw r4,0x80(r3) /* DEVINIT is at offset 0x80 */
715 /* clear all pending interrupts and disable all interrupts */
716 li r4,-1 /* set p1 to 0xffffffff */
717 stw r4,0x1b0(r3) /* clear all pending interrupts */
718 stw r4,0x1b8(r3) /* clear all pending interrupts */
719 li r4,0 /* set r4 to 0 */
720 stw r4,0x1b4(r3) /* disable all interrupts */
721 stw r4,0x1bc(r3) /* disable all interrupts */
723 /* make sure above stores all comlete before going on */
726 /*----------------------------------------------------------------------- */
727 /* Enable two 128MB cachable regions. */
728 /*----------------------------------------------------------------------- */
731 mticcr r1 /* instruction cache */
735 mtdccr r1 /* data cache */
737 addis r1,r0,CFG_INIT_RAM_ADDR@h
738 ori r1,r1,CFG_INIT_SP_OFFSET /* set up the stack to SDRAM */
739 li r0, 0 /* Make room for stack frame header and */
740 stwu r0, -4(r1) /* clear final stack frame so that */
741 stwu r0, -4(r1) /* stack backtraces terminate cleanly */
743 GET_GOT /* initialize GOT access */
745 bl board_init_f /* run first part of init code (from Flash) */
747 #endif /* CONFIG_IOP480 */
749 /*****************************************************************************/
750 #if defined(CONFIG_405GP) || defined(CONFIG_405CR) || \
751 defined(CONFIG_405EP) || defined(CONFIG_405EZ) || \
753 /*----------------------------------------------------------------------- */
754 /* Clear and set up some registers. */
755 /*----------------------------------------------------------------------- */
759 mtesr r4 /* clear Exception Syndrome Reg */
760 mttcr r4 /* clear Timer Control Reg */
761 mtxer r4 /* clear Fixed-Point Exception Reg */
762 mtevpr r4 /* clear Exception Vector Prefix Reg */
763 addi r4,r0,(0xFFFF-0x10000) /* set r4 to 0xFFFFFFFF (status in the */
764 /* dbsr is cleared by setting bits to 1) */
765 mtdbsr r4 /* clear/reset the dbsr */
767 /*----------------------------------------------------------------------- */
768 /* Invalidate I and D caches. Enable I cache for defined memory regions */
769 /* to speed things up. Leave the D cache disabled for now. It will be */
770 /* enabled/left disabled later based on user selected menu options. */
771 /* Be aware that the I cache may be disabled later based on the menu */
772 /* options as well. See miscLib/main.c. */
773 /*----------------------------------------------------------------------- */
777 /*----------------------------------------------------------------------- */
778 /* Enable two 128MB cachable regions. */
779 /*----------------------------------------------------------------------- */
782 mticcr r4 /* instruction cache */
787 mtdccr r4 /* data cache */
789 #if !(defined(CFG_EBC_PB0AP) && defined(CFG_EBC_PB0CR))
790 /*----------------------------------------------------------------------- */
791 /* Tune the speed and size for flash CS0 */
792 /*----------------------------------------------------------------------- */
793 bl ext_bus_cntlr_init
796 #if defined(CONFIG_405EP)
797 /*----------------------------------------------------------------------- */
798 /* DMA Status, clear to come up clean */
799 /*----------------------------------------------------------------------- */
800 addis r3,r0, 0xFFFF /* Clear all existing DMA status */
804 bl ppc405ep_init /* do ppc405ep specific init */
805 #endif /* CONFIG_405EP */
807 #if defined(CFG_OCM_DATA_ADDR) && defined(CFG_OCM_DATA_SIZE)
808 #if defined(CONFIG_405EZ)
809 /********************************************************************
810 * Setup OCM - On Chip Memory - PPC405EZ uses OCM Controller V2
811 *******************************************************************/
813 * We can map the OCM on the PLB3, so map it at
814 * CFG_OCM_DATA_ADDR + 0x8000
816 lis r3,CFG_OCM_DATA_ADDR@h /* OCM location */
817 ori r3,r3,CFG_OCM_DATA_ADDR@l
818 ori r3,r3,0x8270 /* 32K Offset, 16K for Bank 1, R/W/Enable */
819 mtdcr ocmplb3cr1,r3 /* Set PLB Access */
820 ori r3,r3,0x4000 /* Add 0x4000 for bank 2 */
821 mtdcr ocmplb3cr2,r3 /* Set PLB Access */
824 lis r3,CFG_OCM_DATA_ADDR@h /* OCM location */
825 ori r3,r3,CFG_OCM_DATA_ADDR@l
826 ori r3,r3,0x0270 /* 16K for Bank 1, R/W/Enable */
827 mtdcr ocmdscr1, r3 /* Set Data Side */
828 mtdcr ocmiscr1, r3 /* Set Instruction Side */
829 ori r3,r3,0x4000 /* Add 0x4000 for bank 2 */
830 mtdcr ocmdscr2, r3 /* Set Data Side */
831 mtdcr ocmiscr2, r3 /* Set Instruction Side */
832 addis r3,0,0x0800 /* OCM Data Parity Disable - 1 Wait State */
836 #else /* CONFIG_405EZ */
837 /********************************************************************
838 * Setup OCM - On Chip Memory
839 *******************************************************************/
843 mfdcr r3, ocmiscntl /* get instr-side IRAM config */
844 mfdcr r4, ocmdscntl /* get data-side IRAM config */
845 and r3, r3, r0 /* disable data-side IRAM */
846 and r4, r4, r0 /* disable data-side IRAM */
847 mtdcr ocmiscntl, r3 /* set instr-side IRAM config */
848 mtdcr ocmdscntl, r4 /* set data-side IRAM config */
851 lis r3,CFG_OCM_DATA_ADDR@h /* OCM location */
852 ori r3,r3,CFG_OCM_DATA_ADDR@l
854 addis r4, 0, 0xC000 /* OCM data area enabled */
857 #endif /* CONFIG_405EZ */
860 /*----------------------------------------------------------------------- */
861 /* Setup temporary stack in DCACHE or OCM if needed for SDRAM SPD. */
862 /*----------------------------------------------------------------------- */
863 #ifdef CFG_INIT_DCACHE_CS
864 /*----------------------------------------------------------------------- */
865 /* Memory Bank x (nothingness) initialization 1GB+64MEG */
866 /* used as temporary stack pointer for stage0 */
867 /*----------------------------------------------------------------------- */
880 /* turn on data chache for this region */
884 /* set stack pointer and clear stack to known value */
886 lis r1,CFG_INIT_RAM_ADDR@h
887 ori r1,r1,CFG_INIT_SP_OFFSET@l
889 li r4,2048 /* we store 2048 words to stack */
892 lis r2,CFG_INIT_RAM_ADDR@h /* we also clear data area */
893 ori r2,r2,CFG_INIT_RAM_END@l /* so cant copy value from r1 */
895 lis r4,0xdead /* we store 0xdeaddead in the stack */
902 li r0, 0 /* Make room for stack frame header and */
903 stwu r0, -4(r1) /* clear final stack frame so that */
904 stwu r0, -4(r1) /* stack backtraces terminate cleanly */
906 * Set up a dummy frame to store reset vector as return address.
907 * this causes stack underflow to reset board.
909 stwu r1, -8(r1) /* Save back chain and move SP */
910 addis r0, 0, RESET_VECTOR@h /* Address of reset vector */
911 ori r0, r0, RESET_VECTOR@l
912 stwu r1, -8(r1) /* Save back chain and move SP */
913 stw r0, +12(r1) /* Save return addr (underflow vect) */
915 #elif defined(CFG_TEMP_STACK_OCM) && \
916 (defined(CFG_OCM_DATA_ADDR) && defined(CFG_OCM_DATA_SIZE))
921 /* Set up Stack at top of OCM */
922 lis r1, (CFG_INIT_RAM_ADDR + CFG_INIT_SP_OFFSET)@h
923 ori r1, r1, (CFG_INIT_RAM_ADDR + CFG_INIT_SP_OFFSET)@l
925 /* Set up a zeroized stack frame so that backtrace works right */
931 * Set up a dummy frame to store reset vector as return address.
932 * this causes stack underflow to reset board.
934 stwu r1, -8(r1) /* Save back chain and move SP */
935 lis r0, RESET_VECTOR@h /* Address of reset vector */
936 ori r0, r0, RESET_VECTOR@l
937 stwu r1, -8(r1) /* Save back chain and move SP */
938 stw r0, +12(r1) /* Save return addr (underflow vect) */
939 #endif /* CFG_INIT_DCACHE_CS */
941 /*----------------------------------------------------------------------- */
942 /* Initialize SDRAM Controller */
943 /*----------------------------------------------------------------------- */
947 * Setup temporary stack pointer only for boards
948 * that do not use SDRAM SPD I2C stuff since it
949 * is already initialized to use DCACHE or OCM
952 #if !(defined(CFG_INIT_DCACHE_CS) || defined(CFG_TEMP_STACK_OCM))
953 lis r1, CFG_INIT_RAM_ADDR@h
954 ori r1,r1,CFG_INIT_SP_OFFSET /* set up the stack in SDRAM */
956 li r0, 0 /* Make room for stack frame header and */
957 stwu r0, -4(r1) /* clear final stack frame so that */
958 stwu r0, -4(r1) /* stack backtraces terminate cleanly */
960 * Set up a dummy frame to store reset vector as return address.
961 * this causes stack underflow to reset board.
963 stwu r1, -8(r1) /* Save back chain and move SP */
964 lis r0, RESET_VECTOR@h /* Address of reset vector */
965 ori r0, r0, RESET_VECTOR@l
966 stwu r1, -8(r1) /* Save back chain and move SP */
967 stw r0, +12(r1) /* Save return addr (underflow vect) */
968 #endif /* !(CFG_INIT_DCACHE_CS || !CFG_TEM_STACK_OCM) */
970 GET_GOT /* initialize GOT access */
972 bl cpu_init_f /* run low-level CPU init code (from Flash) */
975 bl board_init_f /* run first part of init code (from Flash) */
977 #endif /* CONFIG_405GP || CONFIG_405CR || CONFIG_405 || CONFIG_405EP */
978 /*----------------------------------------------------------------------- */
981 #ifndef CONFIG_NAND_SPL
982 /*****************************************************************************/
983 .globl _start_of_vectors
987 /*TODO Fixup _start above so we can do this*/
988 /* Critical input. */
989 CRIT_EXCEPTION(0x100, CritcalInput, CritcalInputException)
993 CRIT_EXCEPTION(0x200, MachineCheck, MachineCheckException)
995 /* Data Storage exception. */
996 STD_EXCEPTION(0x300, DataStorage, UnknownException)
998 /* Instruction Storage exception. */
999 STD_EXCEPTION(0x400, InstStorage, UnknownException)
1001 /* External Interrupt exception. */
1002 STD_EXCEPTION(0x500, ExtInterrupt, external_interrupt)
1004 /* Alignment exception. */
1012 addi r3,r1,STACK_FRAME_OVERHEAD
1014 rlwimi r20,r23,0,16,16 /* copy EE bit from saved MSR */
1015 lwz r6,GOT(transfer_to_handler)
1019 .long AlignmentException - _start + EXC_OFF_SYS_RESET
1020 .long int_return - _start + EXC_OFF_SYS_RESET
1022 /* Program check exception */
1026 addi r3,r1,STACK_FRAME_OVERHEAD
1028 rlwimi r20,r23,0,16,16 /* copy EE bit from saved MSR */
1029 lwz r6,GOT(transfer_to_handler)
1033 .long ProgramCheckException - _start + EXC_OFF_SYS_RESET
1034 .long int_return - _start + EXC_OFF_SYS_RESET
1036 /* No FPU on MPC8xx. This exception is not supposed to happen.
1038 STD_EXCEPTION(0x800, FPUnavailable, UnknownException)
1040 /* I guess we could implement decrementer, and may have
1041 * to someday for timekeeping.
1043 STD_EXCEPTION(0x900, Decrementer, timer_interrupt)
1044 STD_EXCEPTION(0xa00, Trap_0a, UnknownException)
1045 STD_EXCEPTION(0xb00, Trap_0b, UnknownException)
1046 STD_EXCEPTION(0xc00, SystemCall, UnknownException)
1047 STD_EXCEPTION(0xd00, SingleStep, UnknownException)
1049 STD_EXCEPTION(0xe00, Trap_0e, UnknownException)
1050 STD_EXCEPTION(0xf00, Trap_0f, UnknownException)
1052 /* On the MPC8xx, this is a software emulation interrupt. It occurs
1053 * for all unimplemented and illegal instructions.
1055 STD_EXCEPTION(0x1000, PIT, PITException)
1057 STD_EXCEPTION(0x1100, InstructionTLBMiss, UnknownException)
1058 STD_EXCEPTION(0x1200, DataTLBMiss, UnknownException)
1059 STD_EXCEPTION(0x1300, InstructionTLBError, UnknownException)
1060 STD_EXCEPTION(0x1400, DataTLBError, UnknownException)
1062 STD_EXCEPTION(0x1500, Reserved5, UnknownException)
1063 STD_EXCEPTION(0x1600, Reserved6, UnknownException)
1064 STD_EXCEPTION(0x1700, Reserved7, UnknownException)
1065 STD_EXCEPTION(0x1800, Reserved8, UnknownException)
1066 STD_EXCEPTION(0x1900, Reserved9, UnknownException)
1067 STD_EXCEPTION(0x1a00, ReservedA, UnknownException)
1068 STD_EXCEPTION(0x1b00, ReservedB, UnknownException)
1070 STD_EXCEPTION(0x1c00, DataBreakpoint, UnknownException)
1071 STD_EXCEPTION(0x1d00, InstructionBreakpoint, UnknownException)
1072 STD_EXCEPTION(0x1e00, PeripheralBreakpoint, UnknownException)
1073 STD_EXCEPTION(0x1f00, DevPortBreakpoint, UnknownException)
1075 CRIT_EXCEPTION(0x2000, DebugBreakpoint, DebugException )
1077 .globl _end_of_vectors
1084 * This code finishes saving the registers to the exception frame
1085 * and jumps to the appropriate handler for the exception.
1086 * Register r21 is pointer into trap frame, r1 has new stack pointer.
1088 .globl transfer_to_handler
1089 transfer_to_handler:
1099 andi. r23,r23,MSR_PR
1100 mfspr r23,SPRG3 /* if from user, fix up tss.regs */
1102 addi r24,r1,STACK_FRAME_OVERHEAD
1103 stw r24,PT_REGS(r23)
1104 2: addi r2,r23,-TSS /* set r2 to current */
1108 andi. r24,r23,0x3f00 /* get vector offset */
1112 mtspr SPRG2,r22 /* r1 is now kernel sp */
1114 addi r24,r2,TASK_STRUCT_SIZE /* check for kernel stack overflow */
1118 bgt stack_ovf /* if r2 < r1 < r2+TASK_STRUCT_SIZE */
1120 lwz r24,0(r23) /* virtual address of handler */
1121 lwz r23,4(r23) /* where to go when done */
1126 rfi /* jump to handler, enable MMU */
1129 mfmsr r28 /* Disable interrupts */
1133 SYNC /* Some chip revs need this... */
1148 lwz r2,_NIP(r1) /* Restore environment */
1159 mfmsr r28 /* Disable interrupts */
1163 SYNC /* Some chip revs need this... */
1178 lwz r2,_NIP(r1) /* Restore environment */
1180 mtspr 990,r2 /* SRR2 */
1181 mtspr 991,r0 /* SRR3 */
1191 iccci r0,r0 /* for 405, iccci invalidates the */
1192 blr /* entire I cache */
1195 addi r6,0,0x0000 /* clear GPR 6 */
1196 /* Do loop for # of dcache congruence classes. */
1197 lis r7, (CFG_DCACHE_SIZE / CFG_CACHELINE_SIZE / 2)@ha /* TBS for large sized cache */
1198 ori r7, r7, (CFG_DCACHE_SIZE / CFG_CACHELINE_SIZE / 2)@l
1199 /* NOTE: dccci invalidates both */
1200 mtctr r7 /* ways in the D cache */
1202 dccci 0,r6 /* invalidate line */
1203 addi r6,r6, CFG_CACHELINE_SIZE /* bump to next line */
1208 addis r9,r0,0x0002 /* set mask for EE and CE msr bits */
1210 mfmsr r12 /* save msr */
1212 mtmsr r9 /* disable EE and CE */
1213 addi r10,r0,0x0001 /* enable data cache for unused memory */
1214 mfdccr r9 /* region 0xF8000000-0xFFFFFFFF via */
1215 or r10,r10,r9 /* bit 31 in dccr */
1218 /* do loop for # of congruence classes. */
1219 lis r10,(CFG_DCACHE_SIZE / CFG_CACHELINE_SIZE / 2)@ha /* TBS: for large cache sizes */
1220 ori r10,r10,(CFG_DCACHE_SIZE / CFG_CACHELINE_SIZE / 2)@l
1221 lis r11,(CFG_DCACHE_SIZE / 2)@ha /* D cache set size - 2 way sets */
1222 ori r11,r11,(CFG_DCACHE_SIZE / 2)@l /* D cache set size - 2 way sets */
1224 addi r10,r0,(0xE000-0x10000) /* start at 0xFFFFE000 */
1225 add r11,r10,r11 /* add to get to other side of cache line */
1226 ..flush_dcache_loop:
1227 lwz r3,0(r10) /* least recently used side */
1228 lwz r3,0(r11) /* the other side */
1229 dccci r0,r11 /* invalidate both sides */
1230 addi r10,r10,CFG_CACHELINE_SIZE /* bump to next line */
1231 addi r11,r11,CFG_CACHELINE_SIZE /* bump to next line */
1232 bdnz ..flush_dcache_loop
1233 sync /* allow memory access to complete */
1234 mtdccr r9 /* restore dccr */
1235 mtmsr r12 /* restore msr */
1238 .globl icache_enable
1241 bl invalidate_icache
1244 addis r3,r0, 0x8000 /* set bit 0 */
1248 .globl icache_disable
1250 addis r3,r0, 0x0000 /* clear bit 0 */
1255 .globl icache_status
1258 srwi r3, r3, 31 /* >>31 => select bit 0 */
1261 .globl dcache_enable
1264 bl invalidate_dcache
1267 addis r3,r0, 0x8000 /* set bit 0 */
1271 .globl dcache_disable
1276 addis r3,r0, 0x0000 /* clear bit 0 */
1280 .globl dcache_status
1283 srwi r3, r3, 31 /* >>31 => select bit 0 */
1291 #if !defined(CONFIG_440)
1303 /*------------------------------------------------------------------------------- */
1304 /* Function: out16 */
1305 /* Description: Output 16 bits */
1306 /*------------------------------------------------------------------------------- */
1312 /*------------------------------------------------------------------------------- */
1313 /* Function: out16r */
1314 /* Description: Byte reverse and output 16 bits */
1315 /*------------------------------------------------------------------------------- */
1321 /*------------------------------------------------------------------------------- */
1322 /* Function: out32r */
1323 /* Description: Byte reverse and output 32 bits */
1324 /*------------------------------------------------------------------------------- */
1330 /*------------------------------------------------------------------------------- */
1331 /* Function: in16 */
1332 /* Description: Input 16 bits */
1333 /*------------------------------------------------------------------------------- */
1339 /*------------------------------------------------------------------------------- */
1340 /* Function: in16r */
1341 /* Description: Input 16 bits and byte reverse */
1342 /*------------------------------------------------------------------------------- */
1348 /*------------------------------------------------------------------------------- */
1349 /* Function: in32r */
1350 /* Description: Input 32 bits and byte reverse */
1351 /*------------------------------------------------------------------------------- */
1357 /*------------------------------------------------------------------------------- */
1358 /* Function: ppcDcbf */
1359 /* Description: Data Cache block flush */
1360 /* Input: r3 = effective address */
1362 /*------------------------------------------------------------------------------- */
1368 /*------------------------------------------------------------------------------- */
1369 /* Function: ppcDcbi */
1370 /* Description: Data Cache block Invalidate */
1371 /* Input: r3 = effective address */
1373 /*------------------------------------------------------------------------------- */
1379 /*------------------------------------------------------------------------------- */
1380 /* Function: ppcSync */
1381 /* Description: Processor Synchronize */
1384 /*------------------------------------------------------------------------------- */
1391 * void relocate_code (addr_sp, gd, addr_moni)
1393 * This "function" does not return, instead it continues in RAM
1394 * after relocating the monitor code.
1398 * r5 = length in bytes
1399 * r6 = cachelinesize
1401 .globl relocate_code
1403 #if defined(CONFIG_440EP) || defined(CONFIG_440GR) || \
1404 defined(CONFIG_440EPX) || defined(CONFIG_440GRX) || \
1405 defined(CONFIG_440SP) || defined(CONFIG_440SPE)
1407 * On some 440er platforms the cache is enabled in the first TLB (Boot-CS)
1408 * to speed up the boot process. Now this cache needs to be disabled.
1410 iccci 0,0 /* Invalidate inst cache */
1411 dccci 0,0 /* Invalidate data cache, now no longer our stack */
1414 addi r1,r0,0x0000 /* TLB entry #0 */
1415 tlbre r0,r1,0x0002 /* Read contents */
1416 ori r0,r0,0x0c00 /* Or in the inhibit, write through bit */
1417 tlbwe r0,r1,0x0002 /* Save it out */
1421 mr r1, r3 /* Set new stack pointer */
1422 mr r9, r4 /* Save copy of Init Data pointer */
1423 mr r10, r5 /* Save copy of Destination Address */
1425 mr r3, r5 /* Destination Address */
1426 lis r4, CFG_MONITOR_BASE@h /* Source Address */
1427 ori r4, r4, CFG_MONITOR_BASE@l
1428 lwz r5, GOT(__init_end)
1430 li r6, CFG_CACHELINE_SIZE /* Cache Line Size */
1435 * New GOT-PTR = (old GOT-PTR - CFG_MONITOR_BASE) + Destination Address
1441 /* First our own GOT */
1443 /* the the one used by the C code */
1453 beq cr1,4f /* In place copy is not necessary */
1454 beq 7f /* Protect against 0 count */
1473 * Now flush the cache: note that we must start from a cache aligned
1474 * address. Otherwise we might miss one cache line.
1478 beq 7f /* Always flush prefetch queue in any case */
1486 sync /* Wait for all dcbst to complete on bus */
1492 7: sync /* Wait for all icbi to complete on bus */
1496 * We are done. Do not return, instead branch to second part of board
1497 * initialization, now running from RAM.
1500 addi r0, r10, in_ram - _start + EXC_OFF_SYS_RESET
1502 blr /* NEVER RETURNS! */
1507 * Relocation Function, r14 point to got2+0x8000
1509 * Adjust got2 pointers, no need to check for 0, this code
1510 * already puts a few entries in the table.
1512 li r0,__got2_entries@sectoff@l
1513 la r3,GOT(_GOT2_TABLE_)
1514 lwz r11,GOT(_GOT2_TABLE_)
1524 * Now adjust the fixups and the pointers to the fixups
1525 * in case we need to move ourselves again.
1527 2: li r0,__fixup_entries@sectoff@l
1528 lwz r3,GOT(_FIXUP_TABLE_)
1542 * Now clear BSS segment
1544 lwz r3,GOT(__bss_start)
1558 mr r3, r9 /* Init Data pointer */
1559 mr r4, r10 /* Destination Address */
1563 * Copy exception vector code to low memory
1566 * r7: source address, r8: end address, r9: target address
1571 lwz r8, GOT(_end_of_vectors)
1573 li r9, 0x100 /* reset vector always at 0x100 */
1576 bgelr /* return if r7>=r8 - just in case */
1578 mflr r4 /* save link register */
1588 * relocate `hdlr' and `int_return' entries
1590 li r7, .L_MachineCheck - _start + EXC_OFF_SYS_RESET
1591 li r8, Alignment - _start + EXC_OFF_SYS_RESET
1594 addi r7, r7, 0x100 /* next exception vector */
1598 li r7, .L_Alignment - _start + EXC_OFF_SYS_RESET
1601 li r7, .L_ProgramCheck - _start + EXC_OFF_SYS_RESET
1604 li r7, .L_FPUnavailable - _start + EXC_OFF_SYS_RESET
1605 li r8, SystemCall - _start + EXC_OFF_SYS_RESET
1608 addi r7, r7, 0x100 /* next exception vector */
1612 li r7, .L_SingleStep - _start + EXC_OFF_SYS_RESET
1613 li r8, _end_of_vectors - _start + EXC_OFF_SYS_RESET
1616 addi r7, r7, 0x100 /* next exception vector */
1620 #if !defined(CONFIG_440)
1621 addi r7,r0,0x1000 /* set ME bit (Machine Exceptions) */
1622 oris r7,r7,0x0002 /* set CE bit (Critical Exceptions) */
1623 mtmsr r7 /* change MSR */
1626 b __440_msr_continue
1629 addi r7,r0,0x1000 /* set ME bit (Machine Exceptions) */
1630 oris r7,r7,0x0002 /* set CE bit (Critical Exceptions) */
1638 mtlr r4 /* restore link register */
1642 * Function: relocate entries for one exception vector
1645 lwz r0, 0(r7) /* hdlr ... */
1646 add r0, r0, r3 /* ... += dest_addr */
1649 lwz r0, 4(r7) /* int_return ... */
1650 add r0, r0, r3 /* ... += dest_addr */
1655 #if defined(CONFIG_440)
1656 /*----------------------------------------------------------------------------+
1658 +----------------------------------------------------------------------------*/
1659 function_prolog(dcbz_area)
1660 rlwinm. r5,r4,0,27,31
1661 rlwinm r5,r4,27,5,31
1670 function_epilog(dcbz_area)
1672 /*----------------------------------------------------------------------------+
1673 | dflush. Assume 32K at vector address is cachable.
1674 +----------------------------------------------------------------------------*/
1675 function_prolog(dflush)
1677 rlwinm r8,r9,0,15,13
1678 rlwinm r8,r8,0,17,15
1697 function_epilog(dflush)
1698 #endif /* CONFIG_440 */
1699 #endif /* CONFIG_NAND_SPL */
1701 /*------------------------------------------------------------------------------- */
1703 /* Description: Input 8 bits */
1704 /*------------------------------------------------------------------------------- */
1710 /*------------------------------------------------------------------------------- */
1711 /* Function: out8 */
1712 /* Description: Output 8 bits */
1713 /*------------------------------------------------------------------------------- */
1719 /*------------------------------------------------------------------------------- */
1720 /* Function: out32 */
1721 /* Description: Output 32 bits */
1722 /*------------------------------------------------------------------------------- */
1728 /*------------------------------------------------------------------------------- */
1729 /* Function: in32 */
1730 /* Description: Input 32 bits */
1731 /*------------------------------------------------------------------------------- */
1737 /**************************************************************************/
1738 /* PPC405EP specific stuff */
1739 /**************************************************************************/
1743 #ifdef CONFIG_BUBINGA
1745 * Initialize EBC chip selects 1 & 4 and GPIO pins (for alternate
1746 * function) to support FPGA and NVRAM accesses below.
1749 lis r3,GPIO0_OSRH@h /* config GPIO output select */
1750 ori r3,r3,GPIO0_OSRH@l
1751 lis r4,CFG_GPIO0_OSRH@h
1752 ori r4,r4,CFG_GPIO0_OSRH@l
1755 ori r3,r3,GPIO0_OSRL@l
1756 lis r4,CFG_GPIO0_OSRL@h
1757 ori r4,r4,CFG_GPIO0_OSRL@l
1760 lis r3,GPIO0_ISR1H@h /* config GPIO input select */
1761 ori r3,r3,GPIO0_ISR1H@l
1762 lis r4,CFG_GPIO0_ISR1H@h
1763 ori r4,r4,CFG_GPIO0_ISR1H@l
1765 lis r3,GPIO0_ISR1L@h
1766 ori r3,r3,GPIO0_ISR1L@l
1767 lis r4,CFG_GPIO0_ISR1L@h
1768 ori r4,r4,CFG_GPIO0_ISR1L@l
1771 lis r3,GPIO0_TSRH@h /* config GPIO three-state select */
1772 ori r3,r3,GPIO0_TSRH@l
1773 lis r4,CFG_GPIO0_TSRH@h
1774 ori r4,r4,CFG_GPIO0_TSRH@l
1777 ori r3,r3,GPIO0_TSRL@l
1778 lis r4,CFG_GPIO0_TSRL@h
1779 ori r4,r4,CFG_GPIO0_TSRL@l
1782 lis r3,GPIO0_TCR@h /* config GPIO driver output enables */
1783 ori r3,r3,GPIO0_TCR@l
1784 lis r4,CFG_GPIO0_TCR@h
1785 ori r4,r4,CFG_GPIO0_TCR@l
1788 li r3,pb1ap /* program EBC bank 1 for RTC access */
1790 lis r3,CFG_EBC_PB1AP@h
1791 ori r3,r3,CFG_EBC_PB1AP@l
1795 lis r3,CFG_EBC_PB1CR@h
1796 ori r3,r3,CFG_EBC_PB1CR@l
1799 li r3,pb1ap /* program EBC bank 1 for RTC access */
1801 lis r3,CFG_EBC_PB1AP@h
1802 ori r3,r3,CFG_EBC_PB1AP@l
1806 lis r3,CFG_EBC_PB1CR@h
1807 ori r3,r3,CFG_EBC_PB1CR@l
1810 li r3,pb4ap /* program EBC bank 4 for FPGA access */
1812 lis r3,CFG_EBC_PB4AP@h
1813 ori r3,r3,CFG_EBC_PB4AP@l
1817 lis r3,CFG_EBC_PB4CR@h
1818 ori r3,r3,CFG_EBC_PB4CR@l
1822 #ifndef CFG_CPC0_PCI
1823 li r3,CPC0_PCI_HOST_CFG_EN
1824 #ifdef CONFIG_BUBINGA
1826 !-----------------------------------------------------------------------
1827 ! Check FPGA for PCI internal/external arbitration
1828 ! If board is set to internal arbitration, update cpc0_pci
1829 !-----------------------------------------------------------------------
1831 addis r5,r0,FPGA_REG1@h /* set offset for FPGA_REG1 */
1832 ori r5,r5,FPGA_REG1@l
1833 lbz r5,0x0(r5) /* read to get PCI arb selection */
1834 andi. r6,r5,FPGA_REG1_PCI_INT_ARB /* using internal arbiter ?*/
1835 beq ..pci_cfg_set /* if not set, then bypass reg write*/
1837 ori r3,r3,CPC0_PCI_ARBIT_EN
1838 #else /* CFG_CPC0_PCI */
1840 #endif /* CFG_CPC0_PCI */
1842 mtdcr CPC0_PCI, r3 /* Enable internal arbiter*/
1845 !-----------------------------------------------------------------------
1846 ! Check to see if chip is in bypass mode.
1847 ! If so, write stored CPC0_PLLMR0 and CPC0_PLLMR1 values and perform a
1848 ! CPU reset Otherwise, skip this step and keep going.
1849 ! Note: Running BIOS in bypass mode is not supported since PLB speed
1850 ! will not be fast enough for the SDRAM (min 66MHz)
1851 !-----------------------------------------------------------------------
1853 mfdcr r5, CPC0_PLLMR1
1854 rlwinm r4,r5,1,0x1 /* get system clock source (SSCS) */
1857 beq pll_done /* if SSCS =b'1' then PLL has */
1858 /* already been set */
1859 /* and CPU has been reset */
1860 /* so skip to next section */
1862 #ifdef CONFIG_BUBINGA
1864 !-----------------------------------------------------------------------
1865 ! Read NVRAM to get value to write in PLLMR.
1866 ! If value has not been correctly saved, write default value
1867 ! Default config values (assuming on-board 33MHz SYS_CLK) are above.
1868 ! See CPU_DEFAULT_200 and CPU_DEFAULT_266 above.
1870 ! WARNING: This code assumes the first three words in the nvram_t
1871 ! structure in openbios.h. Changing the beginning of
1872 ! the structure will break this code.
1874 !-----------------------------------------------------------------------
1876 addis r3,0,NVRAM_BASE@h
1877 addi r3,r3,NVRAM_BASE@l
1880 addis r5,0,NVRVFY1@h
1881 addi r5,r5,NVRVFY1@l
1882 cmp cr0,0,r4,r5 /* Compare 1st NVRAM Magic number*/
1886 addis r5,0,NVRVFY2@h
1887 addi r5,r5,NVRVFY2@l
1888 cmp cr0,0,r4,r5 /* Compare 2 NVRAM Magic number */
1890 addi r3,r3,8 /* Skip over conf_size */
1891 lwz r4, 4(r3) /* Load PLLMR1 value from NVRAM */
1892 lwz r3, 0(r3) /* Load PLLMR0 value from NVRAM */
1893 rlwinm r5,r4,1,0x1 /* get system clock source (SSCS) */
1894 cmpi cr0,0,r5,1 /* See if PLL is locked */
1897 #endif /* CONFIG_BUBINGA */
1899 addis r3,0,PLLMR0_DEFAULT@h /* PLLMR0 default value */
1900 ori r3,r3,PLLMR0_DEFAULT@l /* */
1901 addis r4,0,PLLMR1_DEFAULT@h /* PLLMR1 default value */
1902 ori r4,r4,PLLMR1_DEFAULT@l /* */
1904 b pll_write /* Write the CPC0_PLLMR with new value */
1908 !-----------------------------------------------------------------------
1909 ! Clear Soft Reset Register
1910 ! This is needed to enable PCI if not booting from serial EPROM
1911 !-----------------------------------------------------------------------
1921 blr /* return to main code */
1924 !-----------------------------------------------------------------------------
1925 ! Function: pll_write
1926 ! Description: Updates the value of the CPC0_PLLMR according to CMOS27E documentation
1928 ! 1. Pll is first disabled (de-activated by putting in bypass mode)
1930 ! 3. Clock dividers are set while PLL is held in reset and bypassed
1931 ! 4. PLL Reset is cleared
1932 ! 5. Wait 100us for PLL to lock
1933 ! 6. A core reset is performed
1934 ! Input: r3 = Value to write to CPC0_PLLMR0
1935 ! Input: r4 = Value to write to CPC0_PLLMR1
1937 !-----------------------------------------------------------------------------
1942 ori r5,r5,0x0101 /* Stop the UART clocks */
1943 mtdcr CPC0_UCR,r5 /* Before changing PLL */
1945 mfdcr r5, CPC0_PLLMR1
1946 rlwinm r5,r5,0,0x7FFFFFFF /* Disable PLL */
1947 mtdcr CPC0_PLLMR1,r5
1948 oris r5,r5,0x4000 /* Set PLL Reset */
1949 mtdcr CPC0_PLLMR1,r5
1951 mtdcr CPC0_PLLMR0,r3 /* Set clock dividers */
1952 rlwinm r5,r4,0,0x3FFFFFFF /* Reset & Bypass new PLL dividers */
1953 oris r5,r5,0x4000 /* Set PLL Reset */
1954 mtdcr CPC0_PLLMR1,r5 /* Set clock dividers */
1955 rlwinm r5,r5,0,0xBFFFFFFF /* Clear PLL Reset */
1956 mtdcr CPC0_PLLMR1,r5
1959 ! Wait min of 100us for PLL to lock.
1960 ! See CMOS 27E databook for more info.
1961 ! At 200MHz, that means waiting 20,000 instructions
1963 addi r3,0,20000 /* 2000 = 0x4e20 */
1968 oris r5,r5,0x8000 /* Enable PLL */
1969 mtdcr CPC0_PLLMR1,r5 /* Engage */
1972 * Reset CPU to guarantee timings are OK
1973 * Not sure if this is needed...
1976 mtspr dbcr0,r3 /* This will cause a CPU core reset, and */
1977 /* execution will continue from the poweron */
1978 /* vector of 0xfffffffc */
1979 #endif /* CONFIG_405EP */
1981 #if defined(CONFIG_440)
1982 /*----------------------------------------------------------------------------+
1984 +----------------------------------------------------------------------------*/
1985 function_prolog(mttlb3)
1988 function_epilog(mttlb3)
1990 /*----------------------------------------------------------------------------+
1992 +----------------------------------------------------------------------------*/
1993 function_prolog(mftlb3)
1996 function_epilog(mftlb3)
1998 /*----------------------------------------------------------------------------+
2000 +----------------------------------------------------------------------------*/
2001 function_prolog(mttlb2)
2004 function_epilog(mttlb2)
2006 /*----------------------------------------------------------------------------+
2008 +----------------------------------------------------------------------------*/
2009 function_prolog(mftlb2)
2012 function_epilog(mftlb2)
2014 /*----------------------------------------------------------------------------+
2016 +----------------------------------------------------------------------------*/
2017 function_prolog(mttlb1)
2020 function_epilog(mttlb1)
2022 /*----------------------------------------------------------------------------+
2024 +----------------------------------------------------------------------------*/
2025 function_prolog(mftlb1)
2028 function_epilog(mftlb1)
2029 #endif /* CONFIG_440 */