3 * Copyright (C) 1999 Magnus Damm <kieraypc01.p.y.kie.era.ericsson.se>
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 /* We don't want the MMU yet.
116 #define MSR_KERNEL ( MSR_ME ) /* Machine Check */
119 .extern ext_bus_cntlr_init
121 #ifdef CONFIG_NAND_U_BOOT
122 .extern reconfig_tlb0
126 * Set up GOT: Global Offset Table
128 * Use r14 to access the GOT
130 #if !defined(CONFIG_NAND_SPL)
132 GOT_ENTRY(_GOT2_TABLE_)
133 GOT_ENTRY(_FIXUP_TABLE_)
136 GOT_ENTRY(_start_of_vectors)
137 GOT_ENTRY(_end_of_vectors)
138 GOT_ENTRY(transfer_to_handler)
140 GOT_ENTRY(__init_end)
142 GOT_ENTRY(__bss_start)
144 #endif /* CONFIG_NAND_SPL */
146 #if defined(CONFIG_NAND_U_BOOT) && !defined(CONFIG_NAND_SPL)
148 * NAND U-Boot image is started from offset 0
153 bl cpu_init_f /* run low-level CPU init code (from Flash) */
158 * 440 Startup -- on reset only the top 4k of the effective
159 * address space is mapped in by an entry in the instruction
160 * and data shadow TLB. The .bootpg section is located in the
161 * top 4k & does only what's necessary to map in the the rest
162 * of the boot rom. Once the boot rom is mapped in we can
163 * proceed with normal startup.
165 * NOTE: CS0 only covers the top 2MB of the effective address
169 #if defined(CONFIG_440)
170 #if !defined(CONFIG_NAND_SPL)
171 .section .bootpg,"ax"
175 /**************************************************************************/
177 /*--------------------------------------------------------------------+
178 | 440EPX BUP Change - Hardware team request
179 +--------------------------------------------------------------------*/
180 #if defined(CONFIG_440EPX) || defined(CONFIG_440GRX)
185 /*----------------------------------------------------------------+
186 | Core bug fix. Clear the esr
187 +-----------------------------------------------------------------*/
190 /*----------------------------------------------------------------*/
191 /* Clear and set up some registers. */
192 /*----------------------------------------------------------------*/
193 iccci r0,r0 /* NOTE: operands not used for 440 */
194 dccci r0,r0 /* NOTE: operands not used for 440 */
201 /* NOTE: 440GX adds machine check status regs */
202 #if defined(CONFIG_440) && !defined(CONFIG_440GP)
209 /*----------------------------------------------------------------*/
211 /*----------------------------------------------------------------*/
212 /* Disable store gathering & broadcast, guarantee inst/data
213 * cache block touch, force load/store alignment
214 * (see errata 1.12: 440_33)
216 lis r1,0x0030 /* store gathering & broadcast disable */
217 ori r1,r1,0x6000 /* cache touch */
220 /*----------------------------------------------------------------*/
221 /* Initialize debug */
222 /*----------------------------------------------------------------*/
224 andis. r1, r1, 0x8000 /* test DBCR0[EDM] bit */
225 bne skip_debug_init /* if set, don't clear debug register */
238 mtspr dbsr,r1 /* Clear all valid bits */
241 #if defined (CONFIG_440SPE)
242 /*----------------------------------------------------------------+
243 | Initialize Core Configuration Reg1.
244 | a. ICDPEI: Record even parity. Normal operation.
245 | b. ICTPEI: Record even parity. Normal operation.
246 | c. DCTPEI: Record even parity. Normal operation.
247 | d. DCDPEI: Record even parity. Normal operation.
248 | e. DCUPEI: Record even parity. Normal operation.
249 | f. DCMPEI: Record even parity. Normal operation.
250 | g. FCOM: Normal operation
251 | h. MMUPEI: Record even parity. Normal operation.
252 | i. FFF: Flush only as much data as necessary.
253 | j. TCS: Timebase increments from CPU clock.
254 +-----------------------------------------------------------------*/
258 /*----------------------------------------------------------------+
259 | Reset the timebase.
260 | The previous write to CCR1 sets the timebase source.
261 +-----------------------------------------------------------------*/
266 /*----------------------------------------------------------------*/
267 /* Setup interrupt vectors */
268 /*----------------------------------------------------------------*/
269 mtspr ivpr,r0 /* Vectors start at 0x0000_0000 */
271 mtspr ivor0,r1 /* Critical input */
273 mtspr ivor1,r1 /* Machine check */
275 mtspr ivor2,r1 /* Data storage */
277 mtspr ivor3,r1 /* Instruction storage */
279 mtspr ivor4,r1 /* External interrupt */
281 mtspr ivor5,r1 /* Alignment */
283 mtspr ivor6,r1 /* Program check */
285 mtspr ivor7,r1 /* Floating point unavailable */
287 mtspr ivor8,r1 /* System call */
289 mtspr ivor10,r1 /* Decrementer (PIT for 440) */
291 mtspr ivor13,r1 /* Data TLB error */
293 mtspr ivor14,r1 /* Instr TLB error */
295 mtspr ivor15,r1 /* Debug */
297 /*----------------------------------------------------------------*/
298 /* Configure cache regions */
299 /*----------------------------------------------------------------*/
317 /*----------------------------------------------------------------*/
318 /* Cache victim limits */
319 /*----------------------------------------------------------------*/
320 /* floors 0, ceiling max to use the entire cache -- nothing locked
327 /*----------------------------------------------------------------+
328 |Initialize MMUCR[STID] = 0.
329 +-----------------------------------------------------------------*/
336 /*----------------------------------------------------------------*/
337 /* Clear all TLB entries -- TID = 0, TS = 0 */
338 /*----------------------------------------------------------------*/
340 li r1,0x003f /* 64 TLB entries */
342 rsttlb: tlbwe r0,r1,0x0000 /* Invalidate all entries (V=0)*/
348 /*----------------------------------------------------------------*/
349 /* TLB entry setup -- step thru tlbtab */
350 /*----------------------------------------------------------------*/
351 #if defined(CONFIG_440SPE)
352 /*----------------------------------------------------------------*/
353 /* We have different TLB tables for revA and rev B of 440SPe */
354 /*----------------------------------------------------------------*/
366 bl tlbtab /* Get tlbtab pointer */
369 li r1,0x003f /* 64 TLB entries max */
376 beq 2f /* 0 marks end */
379 tlbwe r0,r4,0 /* TLB Word 0 */
380 tlbwe r1,r4,1 /* TLB Word 1 */
381 tlbwe r2,r4,2 /* TLB Word 2 */
382 addi r4,r4,1 /* Next TLB */
385 /*----------------------------------------------------------------*/
386 /* Continue from 'normal' start */
387 /*----------------------------------------------------------------*/
390 #if defined(CONFIG_NAND_SPL)
392 * Enable internal SRAM
397 and r1,r1,r2 /* Disable parity check */
400 and r1,r1,r2 /* Disable pwr mgmt */
404 * Copy SPL from cache into internal SRAM
406 li r4,(CFG_NAND_BOOT_SPL_SIZE >> 2) - 1
408 lis r2,CFG_NAND_BOOT_SPL_SRC@h
409 ori r2,r2,CFG_NAND_BOOT_SPL_SRC@l
410 lis r3,CFG_NAND_BOOT_SPL_DST@h
411 ori r3,r3,CFG_NAND_BOOT_SPL_DST@l
418 * Jump to code in RAM
422 lis r3,(CFG_NAND_BOOT_SPL_SRC - CFG_NAND_BOOT_SPL_DST)@h
423 ori r3,r3,(CFG_NAND_BOOT_SPL_SRC - CFG_NAND_BOOT_SPL_DST)@l
438 mtspr srr1,r0 /* Keep things disabled for now */
442 #endif /* CONFIG_440 */
445 * r3 - 1st arg to board_init(): IMMP pointer
446 * r4 - 2nd arg to board_init(): boot flag
448 #ifndef CONFIG_NAND_SPL
450 .long 0x27051956 /* U-Boot Magic Number */
451 .globl version_string
453 .ascii U_BOOT_VERSION
454 .ascii " (", __DATE__, " - ", __TIME__, ")"
455 .ascii CONFIG_IDENT_STRING, "\0"
458 * Maybe this should be moved somewhere else because the current
459 * location (0x100) is where the CriticalInput Execption should be.
461 . = EXC_OFF_SYS_RESET
466 /*****************************************************************************/
467 #if defined(CONFIG_440)
469 /*----------------------------------------------------------------*/
470 /* Clear and set up some registers. */
471 /*----------------------------------------------------------------*/
474 mtspr dec,r0 /* prevent dec exceptions */
475 mtspr tbl,r0 /* prevent fit & wdt exceptions */
477 mtspr tsr,r1 /* clear all timer exception status */
478 mtspr tcr,r0 /* disable all */
479 mtspr esr,r0 /* clear exception syndrome register */
480 mtxer r0 /* clear integer exception register */
482 /*----------------------------------------------------------------*/
483 /* Debug setup -- some (not very good) ice's need an event*/
484 /* to establish control :-( Define CFG_INIT_DBCR to the dbsr */
485 /* value you need in this case 0x8cff 0000 should do the trick */
486 /*----------------------------------------------------------------*/
487 #if defined(CFG_INIT_DBCR)
490 mtspr dbsr,r1 /* Clear all status bits */
491 lis r0,CFG_INIT_DBCR@h
492 ori r0,r0,CFG_INIT_DBCR@l
497 /*----------------------------------------------------------------*/
498 /* Setup the internal SRAM */
499 /*----------------------------------------------------------------*/
502 #ifdef CFG_INIT_RAM_DCACHE
503 /* Clear Dcache to use as RAM */
504 addis r3,r0,CFG_INIT_RAM_ADDR@h
505 ori r3,r3,CFG_INIT_RAM_ADDR@l
506 addis r4,r0,CFG_INIT_RAM_END@h
507 ori r4,r4,CFG_INIT_RAM_END@l
508 rlwinm. r5,r4,0,27,31
518 #endif /* CFG_INIT_RAM_DCACHE */
520 /* 440EP & 440GR are only 440er PPC's without internal SRAM */
521 #if !defined(CONFIG_440EP) && !defined(CONFIG_440GR)
522 /* not all PPC's have internal SRAM usable as L2-cache */
523 #if defined(CONFIG_440GX) || defined(CONFIG_440SP) || defined(CONFIG_440SPE)
524 mtdcr l2_cache_cfg,r0 /* Ensure L2 Cache is off */
530 and r1,r1,r2 /* Disable parity check */
533 and r1,r1,r2 /* Disable pwr mgmt */
536 lis r1,0x8000 /* BAS = 8000_0000 */
537 #if defined(CONFIG_440GX) || defined(CONFIG_440SP)
538 ori r1,r1,0x0980 /* first 64k */
539 mtdcr isram0_sb0cr,r1
541 ori r1,r1,0x0980 /* second 64k */
542 mtdcr isram0_sb1cr,r1
544 ori r1,r1, 0x0980 /* third 64k */
545 mtdcr isram0_sb2cr,r1
547 ori r1,r1, 0x0980 /* fourth 64k */
548 mtdcr isram0_sb3cr,r1
549 #elif defined(CONFIG_440SPE)
550 lis r1,0x0000 /* BAS = 0000_0000 */
551 ori r1,r1,0x0984 /* first 64k */
552 mtdcr isram0_sb0cr,r1
554 ori r1,r1,0x0984 /* second 64k */
555 mtdcr isram0_sb1cr,r1
557 ori r1,r1, 0x0984 /* third 64k */
558 mtdcr isram0_sb2cr,r1
560 ori r1,r1, 0x0984 /* fourth 64k */
561 mtdcr isram0_sb3cr,r1
562 #elif defined(CONFIG_440GP)
563 ori r1,r1,0x0380 /* 8k rw */
564 mtdcr isram0_sb0cr,r1
565 mtdcr isram0_sb1cr,r0 /* Disable bank 1 */
567 #endif /* #if !defined(CONFIG_440EP) && !defined(CONFIG_440GR) */
569 /*----------------------------------------------------------------*/
570 /* Setup the stack in internal SRAM */
571 /*----------------------------------------------------------------*/
572 lis r1,CFG_INIT_RAM_ADDR@h
573 ori r1,r1,CFG_INIT_SP_OFFSET@l
576 stwu r0,-4(r1) /* Terminate call chain */
578 stwu r1,-8(r1) /* Save back chain and move SP */
579 lis r0,RESET_VECTOR@h /* Address of reset vector */
580 ori r0,r0, RESET_VECTOR@l
581 stwu r1,-8(r1) /* Save back chain and move SP */
582 stw r0,+12(r1) /* Save return addr (underflow vect) */
584 #ifdef CONFIG_NAND_SPL
585 bl nand_boot /* will not return */
589 bl cpu_init_f /* run low-level CPU init code (from Flash) */
593 #endif /* CONFIG_440 */
595 /*****************************************************************************/
597 /*----------------------------------------------------------------------- */
598 /* Set up some machine state registers. */
599 /*----------------------------------------------------------------------- */
600 addi r0,r0,0x0000 /* initialize r0 to zero */
601 mtspr esr,r0 /* clear Exception Syndrome Reg */
602 mttcr r0 /* timer control register */
603 mtexier r0 /* disable all interrupts */
604 addis r4,r0,0xFFFF /* set r4 to 0xFFFFFFFF (status in the */
605 ori r4,r4,0xFFFF /* dbsr is cleared by setting bits to 1) */
606 mtdbsr r4 /* clear/reset the dbsr */
607 mtexisr r4 /* clear all pending interrupts */
609 mtexier r4 /* enable critical exceptions */
610 addis r4,r0,0x0000 /* assume 403GCX - enable core clk */
611 ori r4,r4,0x4020 /* dbling (no harm done on GA and GC */
612 mtiocr r4 /* since bit not used) & DRC to latch */
613 /* data bus on rising edge of CAS */
614 /*----------------------------------------------------------------------- */
616 /*----------------------------------------------------------------------- */
618 /*----------------------------------------------------------------------- */
619 /* Invalidate i-cache and d-cache TAG arrays. */
620 /*----------------------------------------------------------------------- */
621 addi r3,0,1024 /* 1/4 of I-cache size, half of D-cache */
622 addi r4,0,1024 /* 1/4 of I-cache */
627 addic. r3,r3,-16 /* move back one cache line */
628 bne ..cloop /* loop back to do rest until r3 = 0 */
631 /* initialize IOP480 so it can read 1 MB code area for SRAM spaces */
632 /* this requires enabling MA[17..0], by default only MA[12..0] are enabled. */
635 /* first copy IOP480 register base address into r3 */
636 addis r3,0,0x5000 /* IOP480 register base address hi */
637 /* ori r3,r3,0x0000 / IOP480 register base address lo */
640 /* use r4 as the working variable */
641 /* turn on CS3 (LOCCTL.7) */
642 lwz r4,0x84(r3) /* LOCTL is at offset 0x84 */
643 andi. r4,r4,0xff7f /* make bit 7 = 0 -- CS3 mode */
644 stw r4,0x84(r3) /* LOCTL is at offset 0x84 */
647 #ifdef CONFIG_DASA_SIM
648 /* use r4 as the working variable */
649 /* turn on MA17 (LOCCTL.7) */
650 lwz r4,0x84(r3) /* LOCTL is at offset 0x84 */
651 ori r4,r4,0x80 /* make bit 7 = 1 -- MA17 mode */
652 stw r4,0x84(r3) /* LOCTL is at offset 0x84 */
655 /* turn on MA16..13 (LCS0BRD.12 = 0) */
656 lwz r4,0x100(r3) /* LCS0BRD is at offset 0x100 */
657 andi. r4,r4,0xefff /* make bit 12 = 0 */
658 stw r4,0x100(r3) /* LCS0BRD is at offset 0x100 */
660 /* make sure above stores all comlete before going on */
663 /* last thing, set local init status done bit (DEVINIT.31) */
664 lwz r4,0x80(r3) /* DEVINIT is at offset 0x80 */
665 oris r4,r4,0x8000 /* make bit 31 = 1 */
666 stw r4,0x80(r3) /* DEVINIT is at offset 0x80 */
668 /* clear all pending interrupts and disable all interrupts */
669 li r4,-1 /* set p1 to 0xffffffff */
670 stw r4,0x1b0(r3) /* clear all pending interrupts */
671 stw r4,0x1b8(r3) /* clear all pending interrupts */
672 li r4,0 /* set r4 to 0 */
673 stw r4,0x1b4(r3) /* disable all interrupts */
674 stw r4,0x1bc(r3) /* disable all interrupts */
676 /* make sure above stores all comlete before going on */
679 /*----------------------------------------------------------------------- */
680 /* Enable two 128MB cachable regions. */
681 /*----------------------------------------------------------------------- */
684 mticcr r1 /* instruction cache */
688 mtdccr r1 /* data cache */
690 addis r1,r0,CFG_INIT_RAM_ADDR@h
691 ori r1,r1,CFG_INIT_SP_OFFSET /* set up the stack to SDRAM */
692 li r0, 0 /* Make room for stack frame header and */
693 stwu r0, -4(r1) /* clear final stack frame so that */
694 stwu r0, -4(r1) /* stack backtraces terminate cleanly */
696 GET_GOT /* initialize GOT access */
698 bl board_init_f /* run first part of init code (from Flash) */
700 #endif /* CONFIG_IOP480 */
702 /*****************************************************************************/
703 #if defined(CONFIG_405GP) || defined(CONFIG_405CR) || \
704 defined(CONFIG_405EP) || defined(CONFIG_405EZ) || \
706 /*----------------------------------------------------------------------- */
707 /* Clear and set up some registers. */
708 /*----------------------------------------------------------------------- */
712 mtesr r4 /* clear Exception Syndrome Reg */
713 mttcr r4 /* clear Timer Control Reg */
714 mtxer r4 /* clear Fixed-Point Exception Reg */
715 mtevpr r4 /* clear Exception Vector Prefix Reg */
716 addi r4,r0,(0xFFFF-0x10000) /* set r4 to 0xFFFFFFFF (status in the */
717 /* dbsr is cleared by setting bits to 1) */
718 mtdbsr r4 /* clear/reset the dbsr */
720 /*----------------------------------------------------------------------- */
721 /* Invalidate I and D caches. Enable I cache for defined memory regions */
722 /* to speed things up. Leave the D cache disabled for now. It will be */
723 /* enabled/left disabled later based on user selected menu options. */
724 /* Be aware that the I cache may be disabled later based on the menu */
725 /* options as well. See miscLib/main.c. */
726 /*----------------------------------------------------------------------- */
730 /*----------------------------------------------------------------------- */
731 /* Enable two 128MB cachable regions. */
732 /*----------------------------------------------------------------------- */
735 mticcr r4 /* instruction cache */
740 mtdccr r4 /* data cache */
742 #if !(defined(CFG_EBC_PB0AP) && defined(CFG_EBC_PB0CR))
743 /*----------------------------------------------------------------------- */
744 /* Tune the speed and size for flash CS0 */
745 /*----------------------------------------------------------------------- */
746 bl ext_bus_cntlr_init
749 #if defined(CONFIG_405EP)
750 /*----------------------------------------------------------------------- */
751 /* DMA Status, clear to come up clean */
752 /*----------------------------------------------------------------------- */
753 addis r3,r0, 0xFFFF /* Clear all existing DMA status */
757 bl ppc405ep_init /* do ppc405ep specific init */
758 #endif /* CONFIG_405EP */
760 #if defined(CFG_OCM_DATA_ADDR) && defined(CFG_OCM_DATA_SIZE)
761 #if defined(CONFIG_405EZ)
762 /********************************************************************
763 * Setup OCM - On Chip Memory - PPC405EZ uses OCM Controller V2
764 *******************************************************************/
766 * We can map the OCM on the PLB3, so map it at
767 * CFG_OCM_DATA_ADDR + 0x8000
769 lis r3,CFG_OCM_DATA_ADDR@h /* OCM location */
770 ori r3,r3,CFG_OCM_DATA_ADDR@l
771 ori r3,r3,0x8270 /* 32K Offset, 16K for Bank 1, R/W/Enable */
772 mtdcr ocmplb3cr1,r3 /* Set PLB Access */
773 ori r3,r3,0x4000 /* Add 0x4000 for bank 2 */
774 mtdcr ocmplb3cr2,r3 /* Set PLB Access */
777 lis r3,CFG_OCM_DATA_ADDR@h /* OCM location */
778 ori r3,r3,CFG_OCM_DATA_ADDR@l
779 ori r3,r3,0x0270 /* 16K for Bank 1, R/W/Enable */
780 mtdcr ocmdscr1, r3 /* Set Data Side */
781 mtdcr ocmiscr1, r3 /* Set Instruction Side */
782 ori r3,r3,0x4000 /* Add 0x4000 for bank 2 */
783 mtdcr ocmdscr2, r3 /* Set Data Side */
784 mtdcr ocmiscr2, r3 /* Set Instruction Side */
785 addis r3,0,0x0800 /* OCM Data Parity Disable - 1 Wait State */
789 #else /* CONFIG_405EZ */
790 /********************************************************************
791 * Setup OCM - On Chip Memory
792 *******************************************************************/
796 mfdcr r3, ocmiscntl /* get instr-side IRAM config */
797 mfdcr r4, ocmdscntl /* get data-side IRAM config */
798 and r3, r3, r0 /* disable data-side IRAM */
799 and r4, r4, r0 /* disable data-side IRAM */
800 mtdcr ocmiscntl, r3 /* set instr-side IRAM config */
801 mtdcr ocmdscntl, r4 /* set data-side IRAM config */
804 lis r3,CFG_OCM_DATA_ADDR@h /* OCM location */
805 ori r3,r3,CFG_OCM_DATA_ADDR@l
807 addis r4, 0, 0xC000 /* OCM data area enabled */
810 #endif /* CONFIG_405EZ */
813 /*----------------------------------------------------------------------- */
814 /* Setup temporary stack in DCACHE or OCM if needed for SDRAM SPD. */
815 /*----------------------------------------------------------------------- */
816 #ifdef CFG_INIT_DCACHE_CS
817 /*----------------------------------------------------------------------- */
818 /* Memory Bank x (nothingness) initialization 1GB+64MEG */
819 /* used as temporary stack pointer for stage0 */
820 /*----------------------------------------------------------------------- */
833 /* turn on data chache for this region */
837 /* set stack pointer and clear stack to known value */
839 lis r1,CFG_INIT_RAM_ADDR@h
840 ori r1,r1,CFG_INIT_SP_OFFSET@l
842 li r4,2048 /* we store 2048 words to stack */
845 lis r2,CFG_INIT_RAM_ADDR@h /* we also clear data area */
846 ori r2,r2,CFG_INIT_RAM_END@l /* so cant copy value from r1 */
848 lis r4,0xdead /* we store 0xdeaddead in the stack */
855 li r0, 0 /* Make room for stack frame header and */
856 stwu r0, -4(r1) /* clear final stack frame so that */
857 stwu r0, -4(r1) /* stack backtraces terminate cleanly */
859 * Set up a dummy frame to store reset vector as return address.
860 * this causes stack underflow to reset board.
862 stwu r1, -8(r1) /* Save back chain and move SP */
863 addis r0, 0, RESET_VECTOR@h /* Address of reset vector */
864 ori r0, r0, RESET_VECTOR@l
865 stwu r1, -8(r1) /* Save back chain and move SP */
866 stw r0, +12(r1) /* Save return addr (underflow vect) */
868 #elif defined(CFG_TEMP_STACK_OCM) && \
869 (defined(CFG_OCM_DATA_ADDR) && defined(CFG_OCM_DATA_SIZE))
874 /* Set up Stack at top of OCM */
875 lis r1, (CFG_INIT_RAM_ADDR + CFG_INIT_SP_OFFSET)@h
876 ori r1, r1, (CFG_INIT_RAM_ADDR + CFG_INIT_SP_OFFSET)@l
878 /* Set up a zeroized stack frame so that backtrace works right */
884 * Set up a dummy frame to store reset vector as return address.
885 * this causes stack underflow to reset board.
887 stwu r1, -8(r1) /* Save back chain and move SP */
888 lis r0, RESET_VECTOR@h /* Address of reset vector */
889 ori r0, r0, RESET_VECTOR@l
890 stwu r1, -8(r1) /* Save back chain and move SP */
891 stw r0, +12(r1) /* Save return addr (underflow vect) */
892 #endif /* CFG_INIT_DCACHE_CS */
894 /*----------------------------------------------------------------------- */
895 /* Initialize SDRAM Controller */
896 /*----------------------------------------------------------------------- */
900 * Setup temporary stack pointer only for boards
901 * that do not use SDRAM SPD I2C stuff since it
902 * is already initialized to use DCACHE or OCM
905 #if !(defined(CFG_INIT_DCACHE_CS) || defined(CFG_TEMP_STACK_OCM))
906 lis r1, CFG_INIT_RAM_ADDR@h
907 ori r1,r1,CFG_INIT_SP_OFFSET /* set up the stack in SDRAM */
909 li r0, 0 /* Make room for stack frame header and */
910 stwu r0, -4(r1) /* clear final stack frame so that */
911 stwu r0, -4(r1) /* stack backtraces terminate cleanly */
913 * Set up a dummy frame to store reset vector as return address.
914 * this causes stack underflow to reset board.
916 stwu r1, -8(r1) /* Save back chain and move SP */
917 lis r0, RESET_VECTOR@h /* Address of reset vector */
918 ori r0, r0, RESET_VECTOR@l
919 stwu r1, -8(r1) /* Save back chain and move SP */
920 stw r0, +12(r1) /* Save return addr (underflow vect) */
921 #endif /* !(CFG_INIT_DCACHE_CS || !CFG_TEM_STACK_OCM) */
923 GET_GOT /* initialize GOT access */
925 bl cpu_init_f /* run low-level CPU init code (from Flash) */
928 bl board_init_f /* run first part of init code (from Flash) */
930 #endif /* CONFIG_405GP || CONFIG_405CR || CONFIG_405 || CONFIG_405EP */
931 /*----------------------------------------------------------------------- */
934 #ifndef CONFIG_NAND_SPL
935 /*****************************************************************************/
936 .globl _start_of_vectors
940 /*TODO Fixup _start above so we can do this*/
941 /* Critical input. */
942 CRIT_EXCEPTION(0x100, CritcalInput, CritcalInputException)
946 CRIT_EXCEPTION(0x200, MachineCheck, MachineCheckException)
948 /* Data Storage exception. */
949 STD_EXCEPTION(0x300, DataStorage, UnknownException)
951 /* Instruction Storage exception. */
952 STD_EXCEPTION(0x400, InstStorage, UnknownException)
954 /* External Interrupt exception. */
955 STD_EXCEPTION(0x500, ExtInterrupt, external_interrupt)
957 /* Alignment exception. */
965 addi r3,r1,STACK_FRAME_OVERHEAD
967 rlwimi r20,r23,0,16,16 /* copy EE bit from saved MSR */
968 lwz r6,GOT(transfer_to_handler)
972 .long AlignmentException - _start + EXC_OFF_SYS_RESET
973 .long int_return - _start + EXC_OFF_SYS_RESET
975 /* Program check exception */
979 addi r3,r1,STACK_FRAME_OVERHEAD
981 rlwimi r20,r23,0,16,16 /* copy EE bit from saved MSR */
982 lwz r6,GOT(transfer_to_handler)
986 .long ProgramCheckException - _start + EXC_OFF_SYS_RESET
987 .long int_return - _start + EXC_OFF_SYS_RESET
989 /* No FPU on MPC8xx. This exception is not supposed to happen.
991 STD_EXCEPTION(0x800, FPUnavailable, UnknownException)
993 /* I guess we could implement decrementer, and may have
994 * to someday for timekeeping.
996 STD_EXCEPTION(0x900, Decrementer, timer_interrupt)
997 STD_EXCEPTION(0xa00, Trap_0a, UnknownException)
998 STD_EXCEPTION(0xb00, Trap_0b, UnknownException)
999 STD_EXCEPTION(0xc00, SystemCall, UnknownException)
1000 STD_EXCEPTION(0xd00, SingleStep, UnknownException)
1002 STD_EXCEPTION(0xe00, Trap_0e, UnknownException)
1003 STD_EXCEPTION(0xf00, Trap_0f, UnknownException)
1005 /* On the MPC8xx, this is a software emulation interrupt. It occurs
1006 * for all unimplemented and illegal instructions.
1008 STD_EXCEPTION(0x1000, PIT, PITException)
1010 STD_EXCEPTION(0x1100, InstructionTLBMiss, UnknownException)
1011 STD_EXCEPTION(0x1200, DataTLBMiss, UnknownException)
1012 STD_EXCEPTION(0x1300, InstructionTLBError, UnknownException)
1013 STD_EXCEPTION(0x1400, DataTLBError, UnknownException)
1015 STD_EXCEPTION(0x1500, Reserved5, UnknownException)
1016 STD_EXCEPTION(0x1600, Reserved6, UnknownException)
1017 STD_EXCEPTION(0x1700, Reserved7, UnknownException)
1018 STD_EXCEPTION(0x1800, Reserved8, UnknownException)
1019 STD_EXCEPTION(0x1900, Reserved9, UnknownException)
1020 STD_EXCEPTION(0x1a00, ReservedA, UnknownException)
1021 STD_EXCEPTION(0x1b00, ReservedB, UnknownException)
1023 STD_EXCEPTION(0x1c00, DataBreakpoint, UnknownException)
1024 STD_EXCEPTION(0x1d00, InstructionBreakpoint, UnknownException)
1025 STD_EXCEPTION(0x1e00, PeripheralBreakpoint, UnknownException)
1026 STD_EXCEPTION(0x1f00, DevPortBreakpoint, UnknownException)
1028 CRIT_EXCEPTION(0x2000, DebugBreakpoint, DebugException )
1030 .globl _end_of_vectors
1037 * This code finishes saving the registers to the exception frame
1038 * and jumps to the appropriate handler for the exception.
1039 * Register r21 is pointer into trap frame, r1 has new stack pointer.
1041 .globl transfer_to_handler
1042 transfer_to_handler:
1052 andi. r23,r23,MSR_PR
1053 mfspr r23,SPRG3 /* if from user, fix up tss.regs */
1055 addi r24,r1,STACK_FRAME_OVERHEAD
1056 stw r24,PT_REGS(r23)
1057 2: addi r2,r23,-TSS /* set r2 to current */
1061 andi. r24,r23,0x3f00 /* get vector offset */
1065 mtspr SPRG2,r22 /* r1 is now kernel sp */
1067 addi r24,r2,TASK_STRUCT_SIZE /* check for kernel stack overflow */
1071 bgt stack_ovf /* if r2 < r1 < r2+TASK_STRUCT_SIZE */
1073 lwz r24,0(r23) /* virtual address of handler */
1074 lwz r23,4(r23) /* where to go when done */
1079 rfi /* jump to handler, enable MMU */
1082 mfmsr r28 /* Disable interrupts */
1086 SYNC /* Some chip revs need this... */
1101 lwz r2,_NIP(r1) /* Restore environment */
1112 mfmsr r28 /* Disable interrupts */
1116 SYNC /* Some chip revs need this... */
1131 lwz r2,_NIP(r1) /* Restore environment */
1133 mtspr 990,r2 /* SRR2 */
1134 mtspr 991,r0 /* SRR3 */
1140 #endif /* CONFIG_NAND_SPL */
1145 iccci r0,r0 /* for 405, iccci invalidates the */
1146 blr /* entire I cache */
1149 addi r6,0,0x0000 /* clear GPR 6 */
1150 /* Do loop for # of dcache congruence classes. */
1151 lis r7, (CFG_DCACHE_SIZE / CFG_CACHELINE_SIZE / 2)@ha /* TBS for large sized cache */
1152 ori r7, r7, (CFG_DCACHE_SIZE / CFG_CACHELINE_SIZE / 2)@l
1153 /* NOTE: dccci invalidates both */
1154 mtctr r7 /* ways in the D cache */
1156 dccci 0,r6 /* invalidate line */
1157 addi r6,r6, CFG_CACHELINE_SIZE /* bump to next line */
1162 addis r9,r0,0x0002 /* set mask for EE and CE msr bits */
1164 mfmsr r12 /* save msr */
1166 mtmsr r9 /* disable EE and CE */
1167 addi r10,r0,0x0001 /* enable data cache for unused memory */
1168 mfdccr r9 /* region 0xF8000000-0xFFFFFFFF via */
1169 or r10,r10,r9 /* bit 31 in dccr */
1172 /* do loop for # of congruence classes. */
1173 lis r10,(CFG_DCACHE_SIZE / CFG_CACHELINE_SIZE / 2)@ha /* TBS: for large cache sizes */
1174 ori r10,r10,(CFG_DCACHE_SIZE / CFG_CACHELINE_SIZE / 2)@l
1175 lis r11,(CFG_DCACHE_SIZE / 2)@ha /* D cache set size - 2 way sets */
1176 ori r11,r11,(CFG_DCACHE_SIZE / 2)@l /* D cache set size - 2 way sets */
1178 addi r10,r0,(0xE000-0x10000) /* start at 0xFFFFE000 */
1179 add r11,r10,r11 /* add to get to other side of cache line */
1180 ..flush_dcache_loop:
1181 lwz r3,0(r10) /* least recently used side */
1182 lwz r3,0(r11) /* the other side */
1183 dccci r0,r11 /* invalidate both sides */
1184 addi r10,r10,CFG_CACHELINE_SIZE /* bump to next line */
1185 addi r11,r11,CFG_CACHELINE_SIZE /* bump to next line */
1186 bdnz ..flush_dcache_loop
1187 sync /* allow memory access to complete */
1188 mtdccr r9 /* restore dccr */
1189 mtmsr r12 /* restore msr */
1192 .globl icache_enable
1195 bl invalidate_icache
1198 addis r3,r0, 0x8000 /* set bit 0 */
1202 .globl icache_disable
1204 addis r3,r0, 0x0000 /* clear bit 0 */
1209 .globl icache_status
1212 srwi r3, r3, 31 /* >>31 => select bit 0 */
1215 .globl dcache_enable
1218 bl invalidate_dcache
1221 addis r3,r0, 0x8000 /* set bit 0 */
1225 .globl dcache_disable
1230 addis r3,r0, 0x0000 /* clear bit 0 */
1234 .globl dcache_status
1237 srwi r3, r3, 31 /* >>31 => select bit 0 */
1245 #if !defined(CONFIG_440)
1257 /*------------------------------------------------------------------------------- */
1259 /* Description: Input 8 bits */
1260 /*------------------------------------------------------------------------------- */
1266 /*------------------------------------------------------------------------------- */
1267 /* Function: out8 */
1268 /* Description: Output 8 bits */
1269 /*------------------------------------------------------------------------------- */
1275 /*------------------------------------------------------------------------------- */
1276 /* Function: out16 */
1277 /* Description: Output 16 bits */
1278 /*------------------------------------------------------------------------------- */
1284 /*------------------------------------------------------------------------------- */
1285 /* Function: out16r */
1286 /* Description: Byte reverse and output 16 bits */
1287 /*------------------------------------------------------------------------------- */
1293 /*------------------------------------------------------------------------------- */
1294 /* Function: out32 */
1295 /* Description: Output 32 bits */
1296 /*------------------------------------------------------------------------------- */
1302 /*------------------------------------------------------------------------------- */
1303 /* Function: out32r */
1304 /* Description: Byte reverse and output 32 bits */
1305 /*------------------------------------------------------------------------------- */
1311 /*------------------------------------------------------------------------------- */
1312 /* Function: in16 */
1313 /* Description: Input 16 bits */
1314 /*------------------------------------------------------------------------------- */
1320 /*------------------------------------------------------------------------------- */
1321 /* Function: in16r */
1322 /* Description: Input 16 bits and byte reverse */
1323 /*------------------------------------------------------------------------------- */
1329 /*------------------------------------------------------------------------------- */
1330 /* Function: in32 */
1331 /* Description: Input 32 bits */
1332 /*------------------------------------------------------------------------------- */
1338 /*------------------------------------------------------------------------------- */
1339 /* Function: in32r */
1340 /* Description: Input 32 bits and byte reverse */
1341 /*------------------------------------------------------------------------------- */
1347 /*------------------------------------------------------------------------------- */
1348 /* Function: ppcDcbf */
1349 /* Description: Data Cache block flush */
1350 /* Input: r3 = effective address */
1352 /*------------------------------------------------------------------------------- */
1358 /*------------------------------------------------------------------------------- */
1359 /* Function: ppcDcbi */
1360 /* Description: Data Cache block Invalidate */
1361 /* Input: r3 = effective address */
1363 /*------------------------------------------------------------------------------- */
1369 /*------------------------------------------------------------------------------- */
1370 /* Function: ppcSync */
1371 /* Description: Processor Synchronize */
1374 /*------------------------------------------------------------------------------- */
1380 /*------------------------------------------------------------------------------*/
1382 #ifndef CONFIG_NAND_SPL
1384 * void relocate_code (addr_sp, gd, addr_moni)
1386 * This "function" does not return, instead it continues in RAM
1387 * after relocating the monitor code.
1391 * r5 = length in bytes
1392 * r6 = cachelinesize
1394 .globl relocate_code
1396 #if defined(CONFIG_440EP) || defined(CONFIG_440GR) || \
1397 defined(CONFIG_440EPX) || defined(CONFIG_440GRX) || \
1398 defined(CONFIG_440SP) || defined(CONFIG_440SPE)
1400 * On some 440er platforms the cache is enabled in the first TLB (Boot-CS)
1401 * to speed up the boot process. Now this cache needs to be disabled.
1403 iccci 0,0 /* Invalidate inst cache */
1404 dccci 0,0 /* Invalidate data cache, now no longer our stack */
1407 addi r1,r0,0x0000 /* TLB entry #0 */
1408 tlbre r0,r1,0x0002 /* Read contents */
1409 ori r0,r0,0x0c00 /* Or in the inhibit, write through bit */
1410 tlbwe r0,r1,0x0002 /* Save it out */
1414 mr r1, r3 /* Set new stack pointer */
1415 mr r9, r4 /* Save copy of Init Data pointer */
1416 mr r10, r5 /* Save copy of Destination Address */
1418 mr r3, r5 /* Destination Address */
1419 lis r4, CFG_MONITOR_BASE@h /* Source Address */
1420 ori r4, r4, CFG_MONITOR_BASE@l
1421 lwz r5, GOT(__init_end)
1423 li r6, CFG_CACHELINE_SIZE /* Cache Line Size */
1428 * New GOT-PTR = (old GOT-PTR - CFG_MONITOR_BASE) + Destination Address
1434 /* First our own GOT */
1436 /* the the one used by the C code */
1446 beq cr1,4f /* In place copy is not necessary */
1447 beq 7f /* Protect against 0 count */
1466 * Now flush the cache: note that we must start from a cache aligned
1467 * address. Otherwise we might miss one cache line.
1471 beq 7f /* Always flush prefetch queue in any case */
1479 sync /* Wait for all dcbst to complete on bus */
1485 7: sync /* Wait for all icbi to complete on bus */
1489 * We are done. Do not return, instead branch to second part of board
1490 * initialization, now running from RAM.
1493 addi r0, r10, in_ram - _start + EXC_OFF_SYS_RESET
1495 blr /* NEVER RETURNS! */
1500 * Relocation Function, r14 point to got2+0x8000
1502 * Adjust got2 pointers, no need to check for 0, this code
1503 * already puts a few entries in the table.
1505 li r0,__got2_entries@sectoff@l
1506 la r3,GOT(_GOT2_TABLE_)
1507 lwz r11,GOT(_GOT2_TABLE_)
1517 * Now adjust the fixups and the pointers to the fixups
1518 * in case we need to move ourselves again.
1520 2: li r0,__fixup_entries@sectoff@l
1521 lwz r3,GOT(_FIXUP_TABLE_)
1535 * Now clear BSS segment
1537 lwz r3,GOT(__bss_start)
1551 mr r3, r9 /* Init Data pointer */
1552 mr r4, r10 /* Destination Address */
1556 * Copy exception vector code to low memory
1559 * r7: source address, r8: end address, r9: target address
1564 lwz r8, GOT(_end_of_vectors)
1566 li r9, 0x100 /* reset vector always at 0x100 */
1569 bgelr /* return if r7>=r8 - just in case */
1571 mflr r4 /* save link register */
1581 * relocate `hdlr' and `int_return' entries
1583 li r7, .L_MachineCheck - _start + EXC_OFF_SYS_RESET
1584 li r8, Alignment - _start + EXC_OFF_SYS_RESET
1587 addi r7, r7, 0x100 /* next exception vector */
1591 li r7, .L_Alignment - _start + EXC_OFF_SYS_RESET
1594 li r7, .L_ProgramCheck - _start + EXC_OFF_SYS_RESET
1597 li r7, .L_FPUnavailable - _start + EXC_OFF_SYS_RESET
1598 li r8, SystemCall - _start + EXC_OFF_SYS_RESET
1601 addi r7, r7, 0x100 /* next exception vector */
1605 li r7, .L_SingleStep - _start + EXC_OFF_SYS_RESET
1606 li r8, _end_of_vectors - _start + EXC_OFF_SYS_RESET
1609 addi r7, r7, 0x100 /* next exception vector */
1613 #if !defined(CONFIG_440)
1614 addi r7,r0,0x1000 /* set ME bit (Machine Exceptions) */
1615 oris r7,r7,0x0002 /* set CE bit (Critical Exceptions) */
1616 mtmsr r7 /* change MSR */
1619 b __440_msr_continue
1622 addi r7,r0,0x1000 /* set ME bit (Machine Exceptions) */
1623 oris r7,r7,0x0002 /* set CE bit (Critical Exceptions) */
1631 mtlr r4 /* restore link register */
1635 * Function: relocate entries for one exception vector
1638 lwz r0, 0(r7) /* hdlr ... */
1639 add r0, r0, r3 /* ... += dest_addr */
1642 lwz r0, 4(r7) /* int_return ... */
1643 add r0, r0, r3 /* ... += dest_addr */
1647 #endif /* CONFIG_NAND_SPL */
1650 /**************************************************************************/
1651 /* PPC405EP specific stuff */
1652 /**************************************************************************/
1656 #ifdef CONFIG_BUBINGA
1658 * Initialize EBC chip selects 1 & 4 and GPIO pins (for alternate
1659 * function) to support FPGA and NVRAM accesses below.
1662 lis r3,GPIO0_OSRH@h /* config GPIO output select */
1663 ori r3,r3,GPIO0_OSRH@l
1664 lis r4,CFG_GPIO0_OSRH@h
1665 ori r4,r4,CFG_GPIO0_OSRH@l
1668 ori r3,r3,GPIO0_OSRL@l
1669 lis r4,CFG_GPIO0_OSRL@h
1670 ori r4,r4,CFG_GPIO0_OSRL@l
1673 lis r3,GPIO0_ISR1H@h /* config GPIO input select */
1674 ori r3,r3,GPIO0_ISR1H@l
1675 lis r4,CFG_GPIO0_ISR1H@h
1676 ori r4,r4,CFG_GPIO0_ISR1H@l
1678 lis r3,GPIO0_ISR1L@h
1679 ori r3,r3,GPIO0_ISR1L@l
1680 lis r4,CFG_GPIO0_ISR1L@h
1681 ori r4,r4,CFG_GPIO0_ISR1L@l
1684 lis r3,GPIO0_TSRH@h /* config GPIO three-state select */
1685 ori r3,r3,GPIO0_TSRH@l
1686 lis r4,CFG_GPIO0_TSRH@h
1687 ori r4,r4,CFG_GPIO0_TSRH@l
1690 ori r3,r3,GPIO0_TSRL@l
1691 lis r4,CFG_GPIO0_TSRL@h
1692 ori r4,r4,CFG_GPIO0_TSRL@l
1695 lis r3,GPIO0_TCR@h /* config GPIO driver output enables */
1696 ori r3,r3,GPIO0_TCR@l
1697 lis r4,CFG_GPIO0_TCR@h
1698 ori r4,r4,CFG_GPIO0_TCR@l
1701 li r3,pb1ap /* program EBC bank 1 for RTC access */
1703 lis r3,CFG_EBC_PB1AP@h
1704 ori r3,r3,CFG_EBC_PB1AP@l
1708 lis r3,CFG_EBC_PB1CR@h
1709 ori r3,r3,CFG_EBC_PB1CR@l
1712 li r3,pb1ap /* program EBC bank 1 for RTC access */
1714 lis r3,CFG_EBC_PB1AP@h
1715 ori r3,r3,CFG_EBC_PB1AP@l
1719 lis r3,CFG_EBC_PB1CR@h
1720 ori r3,r3,CFG_EBC_PB1CR@l
1723 li r3,pb4ap /* program EBC bank 4 for FPGA access */
1725 lis r3,CFG_EBC_PB4AP@h
1726 ori r3,r3,CFG_EBC_PB4AP@l
1730 lis r3,CFG_EBC_PB4CR@h
1731 ori r3,r3,CFG_EBC_PB4CR@l
1735 #ifndef CFG_CPC0_PCI
1736 li r3,CPC0_PCI_HOST_CFG_EN
1737 #ifdef CONFIG_BUBINGA
1739 !-----------------------------------------------------------------------
1740 ! Check FPGA for PCI internal/external arbitration
1741 ! If board is set to internal arbitration, update cpc0_pci
1742 !-----------------------------------------------------------------------
1744 addis r5,r0,FPGA_REG1@h /* set offset for FPGA_REG1 */
1745 ori r5,r5,FPGA_REG1@l
1746 lbz r5,0x0(r5) /* read to get PCI arb selection */
1747 andi. r6,r5,FPGA_REG1_PCI_INT_ARB /* using internal arbiter ?*/
1748 beq ..pci_cfg_set /* if not set, then bypass reg write*/
1750 ori r3,r3,CPC0_PCI_ARBIT_EN
1751 #else /* CFG_CPC0_PCI */
1753 #endif /* CFG_CPC0_PCI */
1755 mtdcr CPC0_PCI, r3 /* Enable internal arbiter*/
1758 !-----------------------------------------------------------------------
1759 ! Check to see if chip is in bypass mode.
1760 ! If so, write stored CPC0_PLLMR0 and CPC0_PLLMR1 values and perform a
1761 ! CPU reset Otherwise, skip this step and keep going.
1762 ! Note: Running BIOS in bypass mode is not supported since PLB speed
1763 ! will not be fast enough for the SDRAM (min 66MHz)
1764 !-----------------------------------------------------------------------
1766 mfdcr r5, CPC0_PLLMR1
1767 rlwinm r4,r5,1,0x1 /* get system clock source (SSCS) */
1770 beq pll_done /* if SSCS =b'1' then PLL has */
1771 /* already been set */
1772 /* and CPU has been reset */
1773 /* so skip to next section */
1775 #ifdef CONFIG_BUBINGA
1777 !-----------------------------------------------------------------------
1778 ! Read NVRAM to get value to write in PLLMR.
1779 ! If value has not been correctly saved, write default value
1780 ! Default config values (assuming on-board 33MHz SYS_CLK) are above.
1781 ! See CPU_DEFAULT_200 and CPU_DEFAULT_266 above.
1783 ! WARNING: This code assumes the first three words in the nvram_t
1784 ! structure in openbios.h. Changing the beginning of
1785 ! the structure will break this code.
1787 !-----------------------------------------------------------------------
1789 addis r3,0,NVRAM_BASE@h
1790 addi r3,r3,NVRAM_BASE@l
1793 addis r5,0,NVRVFY1@h
1794 addi r5,r5,NVRVFY1@l
1795 cmp cr0,0,r4,r5 /* Compare 1st NVRAM Magic number*/
1799 addis r5,0,NVRVFY2@h
1800 addi r5,r5,NVRVFY2@l
1801 cmp cr0,0,r4,r5 /* Compare 2 NVRAM Magic number */
1803 addi r3,r3,8 /* Skip over conf_size */
1804 lwz r4, 4(r3) /* Load PLLMR1 value from NVRAM */
1805 lwz r3, 0(r3) /* Load PLLMR0 value from NVRAM */
1806 rlwinm r5,r4,1,0x1 /* get system clock source (SSCS) */
1807 cmpi cr0,0,r5,1 /* See if PLL is locked */
1810 #endif /* CONFIG_BUBINGA */
1812 addis r3,0,PLLMR0_DEFAULT@h /* PLLMR0 default value */
1813 ori r3,r3,PLLMR0_DEFAULT@l /* */
1814 addis r4,0,PLLMR1_DEFAULT@h /* PLLMR1 default value */
1815 ori r4,r4,PLLMR1_DEFAULT@l /* */
1817 b pll_write /* Write the CPC0_PLLMR with new value */
1821 !-----------------------------------------------------------------------
1822 ! Clear Soft Reset Register
1823 ! This is needed to enable PCI if not booting from serial EPROM
1824 !-----------------------------------------------------------------------
1834 blr /* return to main code */
1837 !-----------------------------------------------------------------------------
1838 ! Function: pll_write
1839 ! Description: Updates the value of the CPC0_PLLMR according to CMOS27E documentation
1841 ! 1. Pll is first disabled (de-activated by putting in bypass mode)
1843 ! 3. Clock dividers are set while PLL is held in reset and bypassed
1844 ! 4. PLL Reset is cleared
1845 ! 5. Wait 100us for PLL to lock
1846 ! 6. A core reset is performed
1847 ! Input: r3 = Value to write to CPC0_PLLMR0
1848 ! Input: r4 = Value to write to CPC0_PLLMR1
1850 !-----------------------------------------------------------------------------
1855 ori r5,r5,0x0101 /* Stop the UART clocks */
1856 mtdcr CPC0_UCR,r5 /* Before changing PLL */
1858 mfdcr r5, CPC0_PLLMR1
1859 rlwinm r5,r5,0,0x7FFFFFFF /* Disable PLL */
1860 mtdcr CPC0_PLLMR1,r5
1861 oris r5,r5,0x4000 /* Set PLL Reset */
1862 mtdcr CPC0_PLLMR1,r5
1864 mtdcr CPC0_PLLMR0,r3 /* Set clock dividers */
1865 rlwinm r5,r4,0,0x3FFFFFFF /* Reset & Bypass new PLL dividers */
1866 oris r5,r5,0x4000 /* Set PLL Reset */
1867 mtdcr CPC0_PLLMR1,r5 /* Set clock dividers */
1868 rlwinm r5,r5,0,0xBFFFFFFF /* Clear PLL Reset */
1869 mtdcr CPC0_PLLMR1,r5
1872 ! Wait min of 100us for PLL to lock.
1873 ! See CMOS 27E databook for more info.
1874 ! At 200MHz, that means waiting 20,000 instructions
1876 addi r3,0,20000 /* 2000 = 0x4e20 */
1881 oris r5,r5,0x8000 /* Enable PLL */
1882 mtdcr CPC0_PLLMR1,r5 /* Engage */
1885 * Reset CPU to guarantee timings are OK
1886 * Not sure if this is needed...
1889 mtspr dbcr0,r3 /* This will cause a CPU core reset, and */
1890 /* execution will continue from the poweron */
1891 /* vector of 0xfffffffc */
1892 #endif /* CONFIG_405EP */
1894 #if defined(CONFIG_440)
1895 #define function_prolog(func_name) .text; \
1899 #define function_epilog(func_name) .type func_name,@function; \
1900 .size func_name,.-func_name
1902 /*----------------------------------------------------------------------------+
1904 +----------------------------------------------------------------------------*/
1905 function_prolog(mttlb3)
1908 function_epilog(mttlb3)
1910 /*----------------------------------------------------------------------------+
1912 +----------------------------------------------------------------------------*/
1913 function_prolog(mftlb3)
1916 function_epilog(mftlb3)
1918 /*----------------------------------------------------------------------------+
1920 +----------------------------------------------------------------------------*/
1921 function_prolog(mttlb2)
1924 function_epilog(mttlb2)
1926 /*----------------------------------------------------------------------------+
1928 +----------------------------------------------------------------------------*/
1929 function_prolog(mftlb2)
1932 function_epilog(mftlb2)
1934 /*----------------------------------------------------------------------------+
1936 +----------------------------------------------------------------------------*/
1937 function_prolog(mttlb1)
1940 function_epilog(mttlb1)
1942 /*----------------------------------------------------------------------------+
1944 +----------------------------------------------------------------------------*/
1945 function_prolog(mftlb1)
1948 function_epilog(mftlb1)
1950 /*----------------------------------------------------------------------------+
1952 +----------------------------------------------------------------------------*/
1953 function_prolog(dcbz_area)
1954 rlwinm. r5,r4,0,27,31
1955 rlwinm r5,r4,27,5,31
1964 function_epilog(dcbz_area)
1966 /*----------------------------------------------------------------------------+
1967 | dflush. Assume 32K at vector address is cachable.
1968 +----------------------------------------------------------------------------*/
1969 function_prolog(dflush)
1971 rlwinm r8,r9,0,15,13
1972 rlwinm r8,r8,0,17,15
1991 function_epilog(dflush)
1992 #endif /* CONFIG_440 */