| /* |
| * Copyright (C) 1998 Dan Malek <dmalek@jlc.net> |
| * Copyright (C) 1999 Magnus Damm <kieraypc01.p.y.kie.era.ericsson.se> |
| * Copyright (C) 2000,2001,2002 Wolfgang Denk <wd@denx.de> |
| * |
| * See file CREDITS for list of people who contributed to this |
| * project. |
| * |
| * This program is free software; you can redistribute it and/or |
| * modify it under the terms of the GNU General Public License as |
| * published by the Free Software Foundation; either version 2 of |
| * the License, or (at your option) any later version. |
| * |
| * This program is distributed in the hope that it will be useful, |
| * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| * GNU General Public License for more details. |
| * |
| * You should have received a copy of the GNU General Public License |
| * along with this program; if not, write to the Free Software |
| * Foundation, Inc., 59 Temple Place, Suite 330, Boston, |
| * MA 02111-1307 USA |
| */ |
| /*------------------------------------------------------------------------------+ */ |
| /* */ |
| /* This source code has been made available to you by IBM on an AS-IS */ |
| /* basis. Anyone receiving this source is licensed under IBM */ |
| /* copyrights to use it in any way he or she deems fit, including */ |
| /* copying it, modifying it, compiling it, and redistributing it either */ |
| /* with or without modifications. No license under IBM patents or */ |
| /* patent applications is to be implied by the copyright license. */ |
| /* */ |
| /* Any user of this software should understand that IBM cannot provide */ |
| /* technical support for this software and will not be responsible for */ |
| /* any consequences resulting from the use of this software. */ |
| /* */ |
| /* Any person who transfers this source code or any derivative work */ |
| /* must include the IBM copyright notice, this paragraph, and the */ |
| /* preceding two paragraphs in the transferred software. */ |
| /* */ |
| /* COPYRIGHT I B M CORPORATION 1995 */ |
| /* LICENSED MATERIAL - PROGRAM PROPERTY OF I B M */ |
| /*------------------------------------------------------------------------------- */ |
| |
| /* U-Boot - Startup Code for AMCC 4xx PowerPC based Embedded Boards |
| * |
| * |
| * The processor starts at 0xfffffffc and the code is executed |
| * from flash/rom. |
| * in memory, but as long we don't jump around before relocating. |
| * board_init lies at a quite high address and when the cpu has |
| * jumped there, everything is ok. |
| * This works because the cpu gives the FLASH (CS0) the whole |
| * address space at startup, and board_init lies as a echo of |
| * the flash somewhere up there in the memorymap. |
| * |
| * board_init will change CS0 to be positioned at the correct |
| * address and (s)dram will be positioned at address 0 |
| */ |
| #include <config.h> |
| #include <mpc8xx.h> |
| #include <ppc4xx.h> |
| #include <version.h> |
| |
| #define _LINUX_CONFIG_H 1 /* avoid reading Linux autoconf.h file */ |
| |
| #include <ppc_asm.tmpl> |
| #include <ppc_defs.h> |
| |
| #include <asm/cache.h> |
| #include <asm/mmu.h> |
| |
| #ifndef CONFIG_IDENT_STRING |
| #define CONFIG_IDENT_STRING "" |
| #endif |
| |
| #ifdef CFG_INIT_DCACHE_CS |
| # if (CFG_INIT_DCACHE_CS == 0) |
| # define PBxAP pb0ap |
| # define PBxCR pb0cr |
| # endif |
| # if (CFG_INIT_DCACHE_CS == 1) |
| # define PBxAP pb1ap |
| # define PBxCR pb1cr |
| # endif |
| # if (CFG_INIT_DCACHE_CS == 2) |
| # define PBxAP pb2ap |
| # define PBxCR pb2cr |
| # endif |
| # if (CFG_INIT_DCACHE_CS == 3) |
| # define PBxAP pb3ap |
| # define PBxCR pb3cr |
| # endif |
| # if (CFG_INIT_DCACHE_CS == 4) |
| # define PBxAP pb4ap |
| # define PBxCR pb4cr |
| # endif |
| # if (CFG_INIT_DCACHE_CS == 5) |
| # define PBxAP pb5ap |
| # define PBxCR pb5cr |
| # endif |
| # if (CFG_INIT_DCACHE_CS == 6) |
| # define PBxAP pb6ap |
| # define PBxCR pb6cr |
| # endif |
| # if (CFG_INIT_DCACHE_CS == 7) |
| # define PBxAP pb7ap |
| # define PBxCR pb7cr |
| # endif |
| #endif /* CFG_INIT_DCACHE_CS */ |
| |
| /* We don't want the MMU yet. |
| */ |
| #undef MSR_KERNEL |
| #define MSR_KERNEL ( MSR_ME ) /* Machine Check */ |
| |
| |
| .extern ext_bus_cntlr_init |
| .extern sdram_init |
| #ifdef CONFIG_NAND_U_BOOT |
| .extern reconfig_tlb0 |
| #endif |
| |
| /* |
| * Set up GOT: Global Offset Table |
| * |
| * Use r14 to access the GOT |
| */ |
| #if !defined(CONFIG_NAND_SPL) |
| START_GOT |
| GOT_ENTRY(_GOT2_TABLE_) |
| GOT_ENTRY(_FIXUP_TABLE_) |
| |
| GOT_ENTRY(_start) |
| GOT_ENTRY(_start_of_vectors) |
| GOT_ENTRY(_end_of_vectors) |
| GOT_ENTRY(transfer_to_handler) |
| |
| GOT_ENTRY(__init_end) |
| GOT_ENTRY(_end) |
| GOT_ENTRY(__bss_start) |
| END_GOT |
| #endif /* CONFIG_NAND_SPL */ |
| |
| #if defined(CONFIG_NAND_U_BOOT) && !defined(CONFIG_NAND_SPL) |
| /* |
| * NAND U-Boot image is started from offset 0 |
| */ |
| .text |
| bl reconfig_tlb0 |
| GET_GOT |
| bl cpu_init_f /* run low-level CPU init code (from Flash) */ |
| bl board_init_f |
| #endif |
| |
| /* |
| * 440 Startup -- on reset only the top 4k of the effective |
| * address space is mapped in by an entry in the instruction |
| * and data shadow TLB. The .bootpg section is located in the |
| * top 4k & does only what's necessary to map in the the rest |
| * of the boot rom. Once the boot rom is mapped in we can |
| * proceed with normal startup. |
| * |
| * NOTE: CS0 only covers the top 2MB of the effective address |
| * space after reset. |
| */ |
| |
| #if defined(CONFIG_440) |
| #if !defined(CONFIG_NAND_SPL) |
| .section .bootpg,"ax" |
| #endif |
| .globl _start_440 |
| |
| /**************************************************************************/ |
| _start_440: |
| /*--------------------------------------------------------------------+ |
| | 440EPX BUP Change - Hardware team request |
| +--------------------------------------------------------------------*/ |
| #if defined(CONFIG_440EPX) || defined(CONFIG_440GRX) |
| sync |
| nop |
| nop |
| #endif |
| /*----------------------------------------------------------------+ |
| | Core bug fix. Clear the esr |
| +-----------------------------------------------------------------*/ |
| li r0,0 |
| mtspr esr,r0 |
| /*----------------------------------------------------------------*/ |
| /* Clear and set up some registers. */ |
| /*----------------------------------------------------------------*/ |
| iccci r0,r0 /* NOTE: operands not used for 440 */ |
| dccci r0,r0 /* NOTE: operands not used for 440 */ |
| sync |
| li r0,0 |
| mtspr srr0,r0 |
| mtspr srr1,r0 |
| mtspr csrr0,r0 |
| mtspr csrr1,r0 |
| /* NOTE: 440GX adds machine check status regs */ |
| #if defined(CONFIG_440) && !defined(CONFIG_440GP) |
| mtspr mcsrr0,r0 |
| mtspr mcsrr1,r0 |
| mfspr r1,mcsr |
| mtspr mcsr,r1 |
| #endif |
| /*----------------------------------------------------------------*/ |
| /* Initialize debug */ |
| /*----------------------------------------------------------------*/ |
| mfspr r1,dbcr0 |
| andis. r1, r1, 0x8000 /* test DBCR0[EDM] bit */ |
| bne skip_debug_init /* if set, don't clear debug register */ |
| mtspr dbcr0,r0 |
| mtspr dbcr1,r0 |
| mtspr dbcr2,r0 |
| mtspr iac1,r0 |
| mtspr iac2,r0 |
| mtspr iac3,r0 |
| mtspr dac1,r0 |
| mtspr dac2,r0 |
| mtspr dvc1,r0 |
| mtspr dvc2,r0 |
| |
| mfspr r1,dbsr |
| mtspr dbsr,r1 /* Clear all valid bits */ |
| skip_debug_init: |
| |
| /*----------------------------------------------------------------*/ |
| /* CCR0 init */ |
| /*----------------------------------------------------------------*/ |
| /* Disable store gathering & broadcast, guarantee inst/data |
| * cache block touch, force load/store alignment |
| * (see errata 1.12: 440_33) |
| */ |
| lis r1,0x0030 /* store gathering & broadcast disable */ |
| ori r1,r1,0x6000 /* cache touch */ |
| mtspr ccr0,r1 |
| |
| #if defined (CONFIG_440SPE) |
| /*----------------------------------------------------------------+ |
| | Initialize Core Configuration Reg1. |
| | a. ICDPEI: Record even parity. Normal operation. |
| | b. ICTPEI: Record even parity. Normal operation. |
| | c. DCTPEI: Record even parity. Normal operation. |
| | d. DCDPEI: Record even parity. Normal operation. |
| | e. DCUPEI: Record even parity. Normal operation. |
| | f. DCMPEI: Record even parity. Normal operation. |
| | g. FCOM: Normal operation |
| | h. MMUPEI: Record even parity. Normal operation. |
| | i. FFF: Flush only as much data as necessary. |
| | j. TCS: Timebase increments from CPU clock. |
| +-----------------------------------------------------------------*/ |
| li r0,0 |
| mtspr ccr1, r0 |
| |
| /*----------------------------------------------------------------+ |
| | Reset the timebase. |
| | The previous write to CCR1 sets the timebase source. |
| +-----------------------------------------------------------------*/ |
| mtspr tbl, r0 |
| mtspr tbu, r0 |
| #endif |
| |
| /*----------------------------------------------------------------*/ |
| /* Setup interrupt vectors */ |
| /*----------------------------------------------------------------*/ |
| mtspr ivpr,r0 /* Vectors start at 0x0000_0000 */ |
| li r1,0x0100 |
| mtspr ivor0,r1 /* Critical input */ |
| li r1,0x0200 |
| mtspr ivor1,r1 /* Machine check */ |
| li r1,0x0300 |
| mtspr ivor2,r1 /* Data storage */ |
| li r1,0x0400 |
| mtspr ivor3,r1 /* Instruction storage */ |
| li r1,0x0500 |
| mtspr ivor4,r1 /* External interrupt */ |
| li r1,0x0600 |
| mtspr ivor5,r1 /* Alignment */ |
| li r1,0x0700 |
| mtspr ivor6,r1 /* Program check */ |
| li r1,0x0800 |
| mtspr ivor7,r1 /* Floating point unavailable */ |
| li r1,0x0c00 |
| mtspr ivor8,r1 /* System call */ |
| li r1,0x1000 |
| mtspr ivor10,r1 /* Decrementer (PIT for 440) */ |
| li r1,0x1400 |
| mtspr ivor13,r1 /* Data TLB error */ |
| li r1,0x1300 |
| mtspr ivor14,r1 /* Instr TLB error */ |
| li r1,0x2000 |
| mtspr ivor15,r1 /* Debug */ |
| |
| /*----------------------------------------------------------------*/ |
| /* Configure cache regions */ |
| /*----------------------------------------------------------------*/ |
| mtspr inv0,r0 |
| mtspr inv1,r0 |
| mtspr inv2,r0 |
| mtspr inv3,r0 |
| mtspr dnv0,r0 |
| mtspr dnv1,r0 |
| mtspr dnv2,r0 |
| mtspr dnv3,r0 |
| mtspr itv0,r0 |
| mtspr itv1,r0 |
| mtspr itv2,r0 |
| mtspr itv3,r0 |
| mtspr dtv0,r0 |
| mtspr dtv1,r0 |
| mtspr dtv2,r0 |
| mtspr dtv3,r0 |
| |
| /*----------------------------------------------------------------*/ |
| /* Cache victim limits */ |
| /*----------------------------------------------------------------*/ |
| /* floors 0, ceiling max to use the entire cache -- nothing locked |
| */ |
| lis r1,0x0001 |
| ori r1,r1,0xf800 |
| mtspr ivlim,r1 |
| mtspr dvlim,r1 |
| |
| /*----------------------------------------------------------------+ |
| |Initialize MMUCR[STID] = 0. |
| +-----------------------------------------------------------------*/ |
| mfspr r0,mmucr |
| addis r1,0,0xFFFF |
| ori r1,r1,0xFF00 |
| and r0,r0,r1 |
| mtspr mmucr,r0 |
| |
| /*----------------------------------------------------------------*/ |
| /* Clear all TLB entries -- TID = 0, TS = 0 */ |
| /*----------------------------------------------------------------*/ |
| addis r0,0,0x0000 |
| li r1,0x003f /* 64 TLB entries */ |
| mtctr r1 |
| rsttlb: tlbwe r0,r1,0x0000 /* Invalidate all entries (V=0)*/ |
| tlbwe r0,r1,0x0001 |
| tlbwe r0,r1,0x0002 |
| subi r1,r1,0x0001 |
| bdnz rsttlb |
| |
| /*----------------------------------------------------------------*/ |
| /* TLB entry setup -- step thru tlbtab */ |
| /*----------------------------------------------------------------*/ |
| #if defined(CONFIG_440SPE) |
| /*----------------------------------------------------------------*/ |
| /* We have different TLB tables for revA and rev B of 440SPe */ |
| /*----------------------------------------------------------------*/ |
| mfspr r1, PVR |
| lis r0,0x5342 |
| ori r0,r0,0x1891 |
| cmpw r7,r1,r0 |
| bne r7,..revA |
| bl tlbtabB |
| b ..goon |
| ..revA: |
| bl tlbtabA |
| ..goon: |
| #else |
| bl tlbtab /* Get tlbtab pointer */ |
| #endif |
| mr r5,r0 |
| li r1,0x003f /* 64 TLB entries max */ |
| mtctr r1 |
| li r4,0 /* TLB # */ |
| |
| addi r5,r5,-4 |
| 1: lwzu r0,4(r5) |
| cmpwi r0,0 |
| beq 2f /* 0 marks end */ |
| lwzu r1,4(r5) |
| lwzu r2,4(r5) |
| tlbwe r0,r4,0 /* TLB Word 0 */ |
| tlbwe r1,r4,1 /* TLB Word 1 */ |
| tlbwe r2,r4,2 /* TLB Word 2 */ |
| addi r4,r4,1 /* Next TLB */ |
| bdnz 1b |
| |
| /*----------------------------------------------------------------*/ |
| /* Continue from 'normal' start */ |
| /*----------------------------------------------------------------*/ |
| 2: |
| |
| #if defined(CONFIG_NAND_SPL) |
| /* |
| * Enable internal SRAM |
| */ |
| lis r2,0x7fff |
| ori r2,r2,0xffff |
| mfdcr r1,isram0_dpc |
| and r1,r1,r2 /* Disable parity check */ |
| mtdcr isram0_dpc,r1 |
| mfdcr r1,isram0_pmeg |
| and r1,r1,r2 /* Disable pwr mgmt */ |
| mtdcr isram0_pmeg,r1 |
| |
| /* |
| * Copy SPL from cache into internal SRAM |
| */ |
| li r4,(CFG_NAND_BOOT_SPL_SIZE >> 2) - 1 |
| mtctr r4 |
| lis r2,CFG_NAND_BOOT_SPL_SRC@h |
| ori r2,r2,CFG_NAND_BOOT_SPL_SRC@l |
| lis r3,CFG_NAND_BOOT_SPL_DST@h |
| ori r3,r3,CFG_NAND_BOOT_SPL_DST@l |
| spl_loop: |
| lwzu r4,4(r2) |
| stwu r4,4(r3) |
| bdnz spl_loop |
| |
| /* |
| * Jump to code in RAM |
| */ |
| bl 00f |
| 00: mflr r10 |
| lis r3,(CFG_NAND_BOOT_SPL_SRC - CFG_NAND_BOOT_SPL_DST)@h |
| ori r3,r3,(CFG_NAND_BOOT_SPL_SRC - CFG_NAND_BOOT_SPL_DST)@l |
| sub r10,r10,r3 |
| addi r10,r10,28 |
| mtlr r10 |
| blr |
| |
| start_ram: |
| sync |
| isync |
| #endif |
| |
| bl 3f |
| b _start |
| |
| 3: li r0,0 |
| mtspr srr1,r0 /* Keep things disabled for now */ |
| mflr r1 |
| mtspr srr0,r1 |
| rfi |
| #endif /* CONFIG_440 */ |
| |
| /* |
| * r3 - 1st arg to board_init(): IMMP pointer |
| * r4 - 2nd arg to board_init(): boot flag |
| */ |
| #ifndef CONFIG_NAND_SPL |
| .text |
| .long 0x27051956 /* U-Boot Magic Number */ |
| .globl version_string |
| version_string: |
| .ascii U_BOOT_VERSION |
| .ascii " (", __DATE__, " - ", __TIME__, ")" |
| .ascii CONFIG_IDENT_STRING, "\0" |
| |
| /* |
| * Maybe this should be moved somewhere else because the current |
| * location (0x100) is where the CriticalInput Execption should be. |
| */ |
| . = EXC_OFF_SYS_RESET |
| #endif |
| .globl _start |
| _start: |
| |
| /*****************************************************************************/ |
| #if defined(CONFIG_440) |
| |
| /*----------------------------------------------------------------*/ |
| /* Clear and set up some registers. */ |
| /*----------------------------------------------------------------*/ |
| li r0,0x0000 |
| lis r1,0xffff |
| mtspr dec,r0 /* prevent dec exceptions */ |
| mtspr tbl,r0 /* prevent fit & wdt exceptions */ |
| mtspr tbu,r0 |
| mtspr tsr,r1 /* clear all timer exception status */ |
| mtspr tcr,r0 /* disable all */ |
| mtspr esr,r0 /* clear exception syndrome register */ |
| mtxer r0 /* clear integer exception register */ |
| |
| /*----------------------------------------------------------------*/ |
| /* Debug setup -- some (not very good) ice's need an event*/ |
| /* to establish control :-( Define CFG_INIT_DBCR to the dbsr */ |
| /* value you need in this case 0x8cff 0000 should do the trick */ |
| /*----------------------------------------------------------------*/ |
| #if defined(CFG_INIT_DBCR) |
| lis r1,0xffff |
| ori r1,r1,0xffff |
| mtspr dbsr,r1 /* Clear all status bits */ |
| lis r0,CFG_INIT_DBCR@h |
| ori r0,r0,CFG_INIT_DBCR@l |
| mtspr dbcr0,r0 |
| isync |
| #endif |
| |
| /*----------------------------------------------------------------*/ |
| /* Setup the internal SRAM */ |
| /*----------------------------------------------------------------*/ |
| li r0,0 |
| |
| #ifdef CFG_INIT_RAM_DCACHE |
| /* Clear Dcache to use as RAM */ |
| addis r3,r0,CFG_INIT_RAM_ADDR@h |
| ori r3,r3,CFG_INIT_RAM_ADDR@l |
| addis r4,r0,CFG_INIT_RAM_END@h |
| ori r4,r4,CFG_INIT_RAM_END@l |
| rlwinm. r5,r4,0,27,31 |
| rlwinm r5,r4,27,5,31 |
| beq ..d_ran |
| addi r5,r5,0x0001 |
| ..d_ran: |
| mtctr r5 |
| ..d_ag: |
| dcbz r0,r3 |
| addi r3,r3,32 |
| bdnz ..d_ag |
| #endif /* CFG_INIT_RAM_DCACHE */ |
| |
| /* 440EP & 440GR are only 440er PPC's without internal SRAM */ |
| #if !defined(CONFIG_440EP) && !defined(CONFIG_440GR) |
| /* not all PPC's have internal SRAM usable as L2-cache */ |
| #if defined(CONFIG_440GX) || defined(CONFIG_440SP) || defined(CONFIG_440SPE) |
| mtdcr l2_cache_cfg,r0 /* Ensure L2 Cache is off */ |
| #endif |
| |
| lis r2,0x7fff |
| ori r2,r2,0xffff |
| mfdcr r1,isram0_dpc |
| and r1,r1,r2 /* Disable parity check */ |
| mtdcr isram0_dpc,r1 |
| mfdcr r1,isram0_pmeg |
| and r1,r1,r2 /* Disable pwr mgmt */ |
| mtdcr isram0_pmeg,r1 |
| |
| lis r1,0x8000 /* BAS = 8000_0000 */ |
| #if defined(CONFIG_440GX) || defined(CONFIG_440SP) |
| ori r1,r1,0x0980 /* first 64k */ |
| mtdcr isram0_sb0cr,r1 |
| lis r1,0x8001 |
| ori r1,r1,0x0980 /* second 64k */ |
| mtdcr isram0_sb1cr,r1 |
| lis r1, 0x8002 |
| ori r1,r1, 0x0980 /* third 64k */ |
| mtdcr isram0_sb2cr,r1 |
| lis r1, 0x8003 |
| ori r1,r1, 0x0980 /* fourth 64k */ |
| mtdcr isram0_sb3cr,r1 |
| #elif defined(CONFIG_440SPE) |
| lis r1,0x0000 /* BAS = 0000_0000 */ |
| ori r1,r1,0x0984 /* first 64k */ |
| mtdcr isram0_sb0cr,r1 |
| lis r1,0x0001 |
| ori r1,r1,0x0984 /* second 64k */ |
| mtdcr isram0_sb1cr,r1 |
| lis r1, 0x0002 |
| ori r1,r1, 0x0984 /* third 64k */ |
| mtdcr isram0_sb2cr,r1 |
| lis r1, 0x0003 |
| ori r1,r1, 0x0984 /* fourth 64k */ |
| mtdcr isram0_sb3cr,r1 |
| #elif defined(CONFIG_440GP) |
| ori r1,r1,0x0380 /* 8k rw */ |
| mtdcr isram0_sb0cr,r1 |
| mtdcr isram0_sb1cr,r0 /* Disable bank 1 */ |
| #endif |
| #endif /* #if !defined(CONFIG_440EP) && !defined(CONFIG_440GR) */ |
| |
| /*----------------------------------------------------------------*/ |
| /* Setup the stack in internal SRAM */ |
| /*----------------------------------------------------------------*/ |
| lis r1,CFG_INIT_RAM_ADDR@h |
| ori r1,r1,CFG_INIT_SP_OFFSET@l |
| li r0,0 |
| stwu r0,-4(r1) |
| stwu r0,-4(r1) /* Terminate call chain */ |
| |
| stwu r1,-8(r1) /* Save back chain and move SP */ |
| lis r0,RESET_VECTOR@h /* Address of reset vector */ |
| ori r0,r0, RESET_VECTOR@l |
| stwu r1,-8(r1) /* Save back chain and move SP */ |
| stw r0,+12(r1) /* Save return addr (underflow vect) */ |
| |
| #ifdef CONFIG_NAND_SPL |
| bl nand_boot /* will not return */ |
| #else |
| GET_GOT |
| |
| bl cpu_init_f /* run low-level CPU init code (from Flash) */ |
| bl board_init_f |
| #endif |
| |
| #endif /* CONFIG_440 */ |
| |
| /*****************************************************************************/ |
| #ifdef CONFIG_IOP480 |
| /*----------------------------------------------------------------------- */ |
| /* Set up some machine state registers. */ |
| /*----------------------------------------------------------------------- */ |
| addi r0,r0,0x0000 /* initialize r0 to zero */ |
| mtspr esr,r0 /* clear Exception Syndrome Reg */ |
| mttcr r0 /* timer control register */ |
| mtexier r0 /* disable all interrupts */ |
| addis r4,r0,0xFFFF /* set r4 to 0xFFFFFFFF (status in the */ |
| ori r4,r4,0xFFFF /* dbsr is cleared by setting bits to 1) */ |
| mtdbsr r4 /* clear/reset the dbsr */ |
| mtexisr r4 /* clear all pending interrupts */ |
| addis r4,r0,0x8000 |
| mtexier r4 /* enable critical exceptions */ |
| addis r4,r0,0x0000 /* assume 403GCX - enable core clk */ |
| ori r4,r4,0x4020 /* dbling (no harm done on GA and GC */ |
| mtiocr r4 /* since bit not used) & DRC to latch */ |
| /* data bus on rising edge of CAS */ |
| /*----------------------------------------------------------------------- */ |
| /* Clear XER. */ |
| /*----------------------------------------------------------------------- */ |
| mtxer r0 |
| /*----------------------------------------------------------------------- */ |
| /* Invalidate i-cache and d-cache TAG arrays. */ |
| /*----------------------------------------------------------------------- */ |
| addi r3,0,1024 /* 1/4 of I-cache size, half of D-cache */ |
| addi r4,0,1024 /* 1/4 of I-cache */ |
| ..cloop: |
| iccci 0,r3 |
| iccci r4,r3 |
| dccci 0,r3 |
| addic. r3,r3,-16 /* move back one cache line */ |
| bne ..cloop /* loop back to do rest until r3 = 0 */ |
| |
| /* */ |
| /* initialize IOP480 so it can read 1 MB code area for SRAM spaces */ |
| /* this requires enabling MA[17..0], by default only MA[12..0] are enabled. */ |
| /* */ |
| |
| /* first copy IOP480 register base address into r3 */ |
| addis r3,0,0x5000 /* IOP480 register base address hi */ |
| /* ori r3,r3,0x0000 / IOP480 register base address lo */ |
| |
| #ifdef CONFIG_ADCIOP |
| /* use r4 as the working variable */ |
| /* turn on CS3 (LOCCTL.7) */ |
| lwz r4,0x84(r3) /* LOCTL is at offset 0x84 */ |
| andi. r4,r4,0xff7f /* make bit 7 = 0 -- CS3 mode */ |
| stw r4,0x84(r3) /* LOCTL is at offset 0x84 */ |
| #endif |
| |
| #ifdef CONFIG_DASA_SIM |
| /* use r4 as the working variable */ |
| /* turn on MA17 (LOCCTL.7) */ |
| lwz r4,0x84(r3) /* LOCTL is at offset 0x84 */ |
| ori r4,r4,0x80 /* make bit 7 = 1 -- MA17 mode */ |
| stw r4,0x84(r3) /* LOCTL is at offset 0x84 */ |
| #endif |
| |
| /* turn on MA16..13 (LCS0BRD.12 = 0) */ |
| lwz r4,0x100(r3) /* LCS0BRD is at offset 0x100 */ |
| andi. r4,r4,0xefff /* make bit 12 = 0 */ |
| stw r4,0x100(r3) /* LCS0BRD is at offset 0x100 */ |
| |
| /* make sure above stores all comlete before going on */ |
| sync |
| |
| /* last thing, set local init status done bit (DEVINIT.31) */ |
| lwz r4,0x80(r3) /* DEVINIT is at offset 0x80 */ |
| oris r4,r4,0x8000 /* make bit 31 = 1 */ |
| stw r4,0x80(r3) /* DEVINIT is at offset 0x80 */ |
| |
| /* clear all pending interrupts and disable all interrupts */ |
| li r4,-1 /* set p1 to 0xffffffff */ |
| stw r4,0x1b0(r3) /* clear all pending interrupts */ |
| stw r4,0x1b8(r3) /* clear all pending interrupts */ |
| li r4,0 /* set r4 to 0 */ |
| stw r4,0x1b4(r3) /* disable all interrupts */ |
| stw r4,0x1bc(r3) /* disable all interrupts */ |
| |
| /* make sure above stores all comlete before going on */ |
| sync |
| |
| /*----------------------------------------------------------------------- */ |
| /* Enable two 128MB cachable regions. */ |
| /*----------------------------------------------------------------------- */ |
| addis r1,r0,0x8000 |
| addi r1,r1,0x0001 |
| mticcr r1 /* instruction cache */ |
| |
| addis r1,r0,0x0000 |
| addi r1,r1,0x0000 |
| mtdccr r1 /* data cache */ |
| |
| addis r1,r0,CFG_INIT_RAM_ADDR@h |
| ori r1,r1,CFG_INIT_SP_OFFSET /* set up the stack to SDRAM */ |
| li r0, 0 /* Make room for stack frame header and */ |
| stwu r0, -4(r1) /* clear final stack frame so that */ |
| stwu r0, -4(r1) /* stack backtraces terminate cleanly */ |
| |
| GET_GOT /* initialize GOT access */ |
| |
| bl board_init_f /* run first part of init code (from Flash) */ |
| |
| #endif /* CONFIG_IOP480 */ |
| |
| /*****************************************************************************/ |
| #if defined(CONFIG_405GP) || defined(CONFIG_405CR) || defined(CONFIG_405) || defined(CONFIG_405EP) |
| /*----------------------------------------------------------------------- */ |
| /* Clear and set up some registers. */ |
| /*----------------------------------------------------------------------- */ |
| addi r4,r0,0x0000 |
| mtspr sgr,r4 |
| mtspr dcwr,r4 |
| mtesr r4 /* clear Exception Syndrome Reg */ |
| mttcr r4 /* clear Timer Control Reg */ |
| mtxer r4 /* clear Fixed-Point Exception Reg */ |
| mtevpr r4 /* clear Exception Vector Prefix Reg */ |
| addi r4,r0,(0xFFFF-0x10000) /* set r4 to 0xFFFFFFFF (status in the */ |
| /* dbsr is cleared by setting bits to 1) */ |
| mtdbsr r4 /* clear/reset the dbsr */ |
| |
| /*----------------------------------------------------------------------- */ |
| /* Invalidate I and D caches. Enable I cache for defined memory regions */ |
| /* to speed things up. Leave the D cache disabled for now. It will be */ |
| /* enabled/left disabled later based on user selected menu options. */ |
| /* Be aware that the I cache may be disabled later based on the menu */ |
| /* options as well. See miscLib/main.c. */ |
| /*----------------------------------------------------------------------- */ |
| bl invalidate_icache |
| bl invalidate_dcache |
| |
| /*----------------------------------------------------------------------- */ |
| /* Enable two 128MB cachable regions. */ |
| /*----------------------------------------------------------------------- */ |
| addis r4,r0,0x8000 |
| addi r4,r4,0x0001 |
| mticcr r4 /* instruction cache */ |
| isync |
| |
| addis r4,r0,0x0000 |
| addi r4,r4,0x0000 |
| mtdccr r4 /* data cache */ |
| |
| #if !(defined(CFG_EBC_PB0AP) && defined(CFG_EBC_PB0CR)) |
| /*----------------------------------------------------------------------- */ |
| /* Tune the speed and size for flash CS0 */ |
| /*----------------------------------------------------------------------- */ |
| bl ext_bus_cntlr_init |
| #endif |
| |
| #if defined(CONFIG_405EP) |
| /*----------------------------------------------------------------------- */ |
| /* DMA Status, clear to come up clean */ |
| /*----------------------------------------------------------------------- */ |
| addis r3,r0, 0xFFFF /* Clear all existing DMA status */ |
| ori r3,r3, 0xFFFF |
| mtdcr dmasr, r3 |
| |
| bl ppc405ep_init /* do ppc405ep specific init */ |
| #endif /* CONFIG_405EP */ |
| |
| #if defined(CFG_OCM_DATA_ADDR) && defined(CFG_OCM_DATA_SIZE) |
| /******************************************************************** |
| * Setup OCM - On Chip Memory |
| *******************************************************************/ |
| /* Setup OCM */ |
| lis r0, 0x7FFF |
| ori r0, r0, 0xFFFF |
| mfdcr r3, ocmiscntl /* get instr-side IRAM config */ |
| mfdcr r4, ocmdscntl /* get data-side IRAM config */ |
| and r3, r3, r0 /* disable data-side IRAM */ |
| and r4, r4, r0 /* disable data-side IRAM */ |
| mtdcr ocmiscntl, r3 /* set instr-side IRAM config */ |
| mtdcr ocmdscntl, r4 /* set data-side IRAM config */ |
| isync |
| |
| addis r3, 0, CFG_OCM_DATA_ADDR@h /* OCM location */ |
| mtdcr ocmdsarc, r3 |
| addis r4, 0, 0xC000 /* OCM data area enabled */ |
| mtdcr ocmdscntl, r4 |
| isync |
| #endif |
| |
| /*----------------------------------------------------------------------- */ |
| /* Setup temporary stack in DCACHE or OCM if needed for SDRAM SPD. */ |
| /*----------------------------------------------------------------------- */ |
| #ifdef CFG_INIT_DCACHE_CS |
| /*----------------------------------------------------------------------- */ |
| /* Memory Bank x (nothingness) initialization 1GB+64MEG */ |
| /* used as temporary stack pointer for stage0 */ |
| /*----------------------------------------------------------------------- */ |
| li r4,PBxAP |
| mtdcr ebccfga,r4 |
| lis r4,0x0380 |
| ori r4,r4,0x0480 |
| mtdcr ebccfgd,r4 |
| |
| addi r4,0,PBxCR |
| mtdcr ebccfga,r4 |
| lis r4,0x400D |
| ori r4,r4,0xa000 |
| mtdcr ebccfgd,r4 |
| |
| /* turn on data chache for this region */ |
| lis r4,0x0080 |
| mtdccr r4 |
| |
| /* set stack pointer and clear stack to known value */ |
| |
| lis r1,CFG_INIT_RAM_ADDR@h |
| ori r1,r1,CFG_INIT_SP_OFFSET@l |
| |
| li r4,2048 /* we store 2048 words to stack */ |
| mtctr r4 |
| |
| lis r2,CFG_INIT_RAM_ADDR@h /* we also clear data area */ |
| ori r2,r2,CFG_INIT_RAM_END@l /* so cant copy value from r1 */ |
| |
| lis r4,0xdead /* we store 0xdeaddead in the stack */ |
| ori r4,r4,0xdead |
| |
| ..stackloop: |
| stwu r4,-4(r2) |
| bdnz ..stackloop |
| |
| li r0, 0 /* Make room for stack frame header and */ |
| stwu r0, -4(r1) /* clear final stack frame so that */ |
| stwu r0, -4(r1) /* stack backtraces terminate cleanly */ |
| /* |
| * Set up a dummy frame to store reset vector as return address. |
| * this causes stack underflow to reset board. |
| */ |
| stwu r1, -8(r1) /* Save back chain and move SP */ |
| addis r0, 0, RESET_VECTOR@h /* Address of reset vector */ |
| ori r0, r0, RESET_VECTOR@l |
| stwu r1, -8(r1) /* Save back chain and move SP */ |
| stw r0, +12(r1) /* Save return addr (underflow vect) */ |
| |
| #elif defined(CFG_TEMP_STACK_OCM) && \ |
| (defined(CFG_OCM_DATA_ADDR) && defined(CFG_OCM_DATA_SIZE)) |
| /* |
| * Stack in OCM. |
| */ |
| |
| /* Set up Stack at top of OCM */ |
| lis r1, (CFG_INIT_RAM_ADDR + CFG_INIT_SP_OFFSET)@h |
| ori r1, r1, (CFG_INIT_RAM_ADDR + CFG_INIT_SP_OFFSET)@l |
| |
| /* Set up a zeroized stack frame so that backtrace works right */ |
| li r0, 0 |
| stwu r0, -4(r1) |
| stwu r0, -4(r1) |
| |
| /* |
| * Set up a dummy frame to store reset vector as return address. |
| * this causes stack underflow to reset board. |
| */ |
| stwu r1, -8(r1) /* Save back chain and move SP */ |
| lis r0, RESET_VECTOR@h /* Address of reset vector */ |
| ori r0, r0, RESET_VECTOR@l |
| stwu r1, -8(r1) /* Save back chain and move SP */ |
| stw r0, +12(r1) /* Save return addr (underflow vect) */ |
| #endif /* CFG_INIT_DCACHE_CS */ |
| |
| /*----------------------------------------------------------------------- */ |
| /* Initialize SDRAM Controller */ |
| /*----------------------------------------------------------------------- */ |
| bl sdram_init |
| |
| /* |
| * Setup temporary stack pointer only for boards |
| * that do not use SDRAM SPD I2C stuff since it |
| * is already initialized to use DCACHE or OCM |
| * stacks. |
| */ |
| #if !(defined(CFG_INIT_DCACHE_CS) || defined(CFG_TEMP_STACK_OCM)) |
| lis r1, CFG_INIT_RAM_ADDR@h |
| ori r1,r1,CFG_INIT_SP_OFFSET /* set up the stack in SDRAM */ |
| |
| li r0, 0 /* Make room for stack frame header and */ |
| stwu r0, -4(r1) /* clear final stack frame so that */ |
| stwu r0, -4(r1) /* stack backtraces terminate cleanly */ |
| /* |
| * Set up a dummy frame to store reset vector as return address. |
| * this causes stack underflow to reset board. |
| */ |
| stwu r1, -8(r1) /* Save back chain and move SP */ |
| lis r0, RESET_VECTOR@h /* Address of reset vector */ |
| ori r0, r0, RESET_VECTOR@l |
| stwu r1, -8(r1) /* Save back chain and move SP */ |
| stw r0, +12(r1) /* Save return addr (underflow vect) */ |
| #endif /* !(CFG_INIT_DCACHE_CS || !CFG_TEM_STACK_OCM) */ |
| |
| GET_GOT /* initialize GOT access */ |
| |
| bl cpu_init_f /* run low-level CPU init code (from Flash) */ |
| |
| /* NEVER RETURNS! */ |
| bl board_init_f /* run first part of init code (from Flash) */ |
| |
| #endif /* CONFIG_405GP || CONFIG_405CR || CONFIG_405 || CONFIG_405EP */ |
| /*----------------------------------------------------------------------- */ |
| |
| |
| #ifndef CONFIG_NAND_SPL |
| /*****************************************************************************/ |
| .globl _start_of_vectors |
| _start_of_vectors: |
| |
| #if 0 |
| /*TODO Fixup _start above so we can do this*/ |
| /* Critical input. */ |
| CRIT_EXCEPTION(0x100, CritcalInput, CritcalInputException) |
| #endif |
| |
| /* Machine check */ |
| CRIT_EXCEPTION(0x200, MachineCheck, MachineCheckException) |
| |
| /* Data Storage exception. */ |
| STD_EXCEPTION(0x300, DataStorage, UnknownException) |
| |
| /* Instruction Storage exception. */ |
| STD_EXCEPTION(0x400, InstStorage, UnknownException) |
| |
| /* External Interrupt exception. */ |
| STD_EXCEPTION(0x500, ExtInterrupt, external_interrupt) |
| |
| /* Alignment exception. */ |
| . = 0x600 |
| Alignment: |
| EXCEPTION_PROLOG |
| mfspr r4,DAR |
| stw r4,_DAR(r21) |
| mfspr r5,DSISR |
| stw r5,_DSISR(r21) |
| addi r3,r1,STACK_FRAME_OVERHEAD |
| li r20,MSR_KERNEL |
| rlwimi r20,r23,0,16,16 /* copy EE bit from saved MSR */ |
| lwz r6,GOT(transfer_to_handler) |
| mtlr r6 |
| blrl |
| .L_Alignment: |
| .long AlignmentException - _start + EXC_OFF_SYS_RESET |
| .long int_return - _start + EXC_OFF_SYS_RESET |
| |
| /* Program check exception */ |
| . = 0x700 |
| ProgramCheck: |
| EXCEPTION_PROLOG |
| addi r3,r1,STACK_FRAME_OVERHEAD |
| li r20,MSR_KERNEL |
| rlwimi r20,r23,0,16,16 /* copy EE bit from saved MSR */ |
| lwz r6,GOT(transfer_to_handler) |
| mtlr r6 |
| blrl |
| .L_ProgramCheck: |
| .long ProgramCheckException - _start + EXC_OFF_SYS_RESET |
| .long int_return - _start + EXC_OFF_SYS_RESET |
| |
| /* No FPU on MPC8xx. This exception is not supposed to happen. |
| */ |
| STD_EXCEPTION(0x800, FPUnavailable, UnknownException) |
| |
| /* I guess we could implement decrementer, and may have |
| * to someday for timekeeping. |
| */ |
| STD_EXCEPTION(0x900, Decrementer, timer_interrupt) |
| STD_EXCEPTION(0xa00, Trap_0a, UnknownException) |
| STD_EXCEPTION(0xb00, Trap_0b, UnknownException) |
| STD_EXCEPTION(0xc00, SystemCall, UnknownException) |
| STD_EXCEPTION(0xd00, SingleStep, UnknownException) |
| |
| STD_EXCEPTION(0xe00, Trap_0e, UnknownException) |
| STD_EXCEPTION(0xf00, Trap_0f, UnknownException) |
| |
| /* On the MPC8xx, this is a software emulation interrupt. It occurs |
| * for all unimplemented and illegal instructions. |
| */ |
| STD_EXCEPTION(0x1000, PIT, PITException) |
| |
| STD_EXCEPTION(0x1100, InstructionTLBMiss, UnknownException) |
| STD_EXCEPTION(0x1200, DataTLBMiss, UnknownException) |
| STD_EXCEPTION(0x1300, InstructionTLBError, UnknownException) |
| STD_EXCEPTION(0x1400, DataTLBError, UnknownException) |
| |
| STD_EXCEPTION(0x1500, Reserved5, UnknownException) |
| STD_EXCEPTION(0x1600, Reserved6, UnknownException) |
| STD_EXCEPTION(0x1700, Reserved7, UnknownException) |
| STD_EXCEPTION(0x1800, Reserved8, UnknownException) |
| STD_EXCEPTION(0x1900, Reserved9, UnknownException) |
| STD_EXCEPTION(0x1a00, ReservedA, UnknownException) |
| STD_EXCEPTION(0x1b00, ReservedB, UnknownException) |
| |
| STD_EXCEPTION(0x1c00, DataBreakpoint, UnknownException) |
| STD_EXCEPTION(0x1d00, InstructionBreakpoint, UnknownException) |
| STD_EXCEPTION(0x1e00, PeripheralBreakpoint, UnknownException) |
| STD_EXCEPTION(0x1f00, DevPortBreakpoint, UnknownException) |
| |
| CRIT_EXCEPTION(0x2000, DebugBreakpoint, DebugException ) |
| |
| .globl _end_of_vectors |
| _end_of_vectors: |
| |
| |
| . = 0x2100 |
| |
| /* |
| * This code finishes saving the registers to the exception frame |
| * and jumps to the appropriate handler for the exception. |
| * Register r21 is pointer into trap frame, r1 has new stack pointer. |
| */ |
| .globl transfer_to_handler |
| transfer_to_handler: |
| stw r22,_NIP(r21) |
| lis r22,MSR_POW@h |
| andc r23,r23,r22 |
| stw r23,_MSR(r21) |
| SAVE_GPR(7, r21) |
| SAVE_4GPRS(8, r21) |
| SAVE_8GPRS(12, r21) |
| SAVE_8GPRS(24, r21) |
| #if 0 |
| andi. r23,r23,MSR_PR |
| mfspr r23,SPRG3 /* if from user, fix up tss.regs */ |
| beq 2f |
| addi r24,r1,STACK_FRAME_OVERHEAD |
| stw r24,PT_REGS(r23) |
| 2: addi r2,r23,-TSS /* set r2 to current */ |
| tovirt(r2,r2,r23) |
| #endif |
| mflr r23 |
| andi. r24,r23,0x3f00 /* get vector offset */ |
| stw r24,TRAP(r21) |
| li r22,0 |
| stw r22,RESULT(r21) |
| mtspr SPRG2,r22 /* r1 is now kernel sp */ |
| #if 0 |
| addi r24,r2,TASK_STRUCT_SIZE /* check for kernel stack overflow */ |
| cmplw 0,r1,r2 |
| cmplw 1,r1,r24 |
| crand 1,1,4 |
| bgt stack_ovf /* if r2 < r1 < r2+TASK_STRUCT_SIZE */ |
| #endif |
| lwz r24,0(r23) /* virtual address of handler */ |
| lwz r23,4(r23) /* where to go when done */ |
| mtspr SRR0,r24 |
| mtspr SRR1,r20 |
| mtlr r23 |
| SYNC |
| rfi /* jump to handler, enable MMU */ |
| |
| int_return: |
| mfmsr r28 /* Disable interrupts */ |
| li r4,0 |
| ori r4,r4,MSR_EE |
| andc r28,r28,r4 |
| SYNC /* Some chip revs need this... */ |
| mtmsr r28 |
| SYNC |
| lwz r2,_CTR(r1) |
| lwz r0,_LINK(r1) |
| mtctr r2 |
| mtlr r0 |
| lwz r2,_XER(r1) |
| lwz r0,_CCR(r1) |
| mtspr XER,r2 |
| mtcrf 0xFF,r0 |
| REST_10GPRS(3, r1) |
| REST_10GPRS(13, r1) |
| REST_8GPRS(23, r1) |
| REST_GPR(31, r1) |
| lwz r2,_NIP(r1) /* Restore environment */ |
| lwz r0,_MSR(r1) |
| mtspr SRR0,r2 |
| mtspr SRR1,r0 |
| lwz r0,GPR0(r1) |
| lwz r2,GPR2(r1) |
| lwz r1,GPR1(r1) |
| SYNC |
| rfi |
| |
| crit_return: |
| mfmsr r28 /* Disable interrupts */ |
| li r4,0 |
| ori r4,r4,MSR_EE |
| andc r28,r28,r4 |
| SYNC /* Some chip revs need this... */ |
| mtmsr r28 |
| SYNC |
| lwz r2,_CTR(r1) |
| lwz r0,_LINK(r1) |
| mtctr r2 |
| mtlr r0 |
| lwz r2,_XER(r1) |
| lwz r0,_CCR(r1) |
| mtspr XER,r2 |
| mtcrf 0xFF,r0 |
| REST_10GPRS(3, r1) |
| REST_10GPRS(13, r1) |
| REST_8GPRS(23, r1) |
| REST_GPR(31, r1) |
| lwz r2,_NIP(r1) /* Restore environment */ |
| lwz r0,_MSR(r1) |
| mtspr 990,r2 /* SRR2 */ |
| mtspr 991,r0 /* SRR3 */ |
| lwz r0,GPR0(r1) |
| lwz r2,GPR2(r1) |
| lwz r1,GPR1(r1) |
| SYNC |
| rfci |
| #endif /* CONFIG_NAND_SPL */ |
| |
| /* Cache functions. |
| */ |
| invalidate_icache: |
| iccci r0,r0 /* for 405, iccci invalidates the */ |
| blr /* entire I cache */ |
| |
| invalidate_dcache: |
| addi r6,0,0x0000 /* clear GPR 6 */ |
| /* Do loop for # of dcache congruence classes. */ |
| lis r7, (CFG_DCACHE_SIZE / CFG_CACHELINE_SIZE / 2)@ha /* TBS for large sized cache */ |
| ori r7, r7, (CFG_DCACHE_SIZE / CFG_CACHELINE_SIZE / 2)@l |
| /* NOTE: dccci invalidates both */ |
| mtctr r7 /* ways in the D cache */ |
| ..dcloop: |
| dccci 0,r6 /* invalidate line */ |
| addi r6,r6, CFG_CACHELINE_SIZE /* bump to next line */ |
| bdnz ..dcloop |
| blr |
| |
| flush_dcache: |
| addis r9,r0,0x0002 /* set mask for EE and CE msr bits */ |
| ori r9,r9,0x8000 |
| mfmsr r12 /* save msr */ |
| andc r9,r12,r9 |
| mtmsr r9 /* disable EE and CE */ |
| addi r10,r0,0x0001 /* enable data cache for unused memory */ |
| mfdccr r9 /* region 0xF8000000-0xFFFFFFFF via */ |
| or r10,r10,r9 /* bit 31 in dccr */ |
| mtdccr r10 |
| |
| /* do loop for # of congruence classes. */ |
| lis r10,(CFG_DCACHE_SIZE / CFG_CACHELINE_SIZE / 2)@ha /* TBS: for large cache sizes */ |
| ori r10,r10,(CFG_DCACHE_SIZE / CFG_CACHELINE_SIZE / 2)@l |
| lis r11,(CFG_DCACHE_SIZE / 2)@ha /* D cache set size - 2 way sets */ |
| ori r11,r11,(CFG_DCACHE_SIZE / 2)@l /* D cache set size - 2 way sets */ |
| mtctr r10 |
| addi r10,r0,(0xE000-0x10000) /* start at 0xFFFFE000 */ |
| add r11,r10,r11 /* add to get to other side of cache line */ |
| ..flush_dcache_loop: |
| lwz r3,0(r10) /* least recently used side */ |
| lwz r3,0(r11) /* the other side */ |
| dccci r0,r11 /* invalidate both sides */ |
| addi r10,r10,CFG_CACHELINE_SIZE /* bump to next line */ |
| addi r11,r11,CFG_CACHELINE_SIZE /* bump to next line */ |
| bdnz ..flush_dcache_loop |
| sync /* allow memory access to complete */ |
| mtdccr r9 /* restore dccr */ |
| mtmsr r12 /* restore msr */ |
| blr |
| |
| .globl icache_enable |
| icache_enable: |
| mflr r8 |
| bl invalidate_icache |
| mtlr r8 |
| isync |
| addis r3,r0, 0x8000 /* set bit 0 */ |
| mticcr r3 |
| blr |
| |
| .globl icache_disable |
| icache_disable: |
| addis r3,r0, 0x0000 /* clear bit 0 */ |
| mticcr r3 |
| isync |
| blr |
| |
| .globl icache_status |
| icache_status: |
| mficcr r3 |
| srwi r3, r3, 31 /* >>31 => select bit 0 */ |
| blr |
| |
| .globl dcache_enable |
| dcache_enable: |
| mflr r8 |
| bl invalidate_dcache |
| mtlr r8 |
| isync |
| addis r3,r0, 0x8000 /* set bit 0 */ |
| mtdccr r3 |
| blr |
| |
| .globl dcache_disable |
| dcache_disable: |
| mflr r8 |
| bl flush_dcache |
| mtlr r8 |
| addis r3,r0, 0x0000 /* clear bit 0 */ |
| mtdccr r3 |
| blr |
| |
| .globl dcache_status |
| dcache_status: |
| mfdccr r3 |
| srwi r3, r3, 31 /* >>31 => select bit 0 */ |
| blr |
| |
| .globl get_pvr |
| get_pvr: |
| mfspr r3, PVR |
| blr |
| |
| #if !defined(CONFIG_440) |
| .globl wr_pit |
| wr_pit: |
| mtspr pit, r3 |
| blr |
| #endif |
| |
| .globl wr_tcr |
| wr_tcr: |
| mtspr tcr, r3 |
| blr |
| |
| /*------------------------------------------------------------------------------- */ |
| /* Function: in8 */ |
| /* Description: Input 8 bits */ |
| /*------------------------------------------------------------------------------- */ |
| .globl in8 |
| in8: |
| lbz r3,0x0000(r3) |
| blr |
| |
| /*------------------------------------------------------------------------------- */ |
| /* Function: out8 */ |
| /* Description: Output 8 bits */ |
| /*------------------------------------------------------------------------------- */ |
| .globl out8 |
| out8: |
| stb r4,0x0000(r3) |
| blr |
| |
| /*------------------------------------------------------------------------------- */ |
| /* Function: out16 */ |
| /* Description: Output 16 bits */ |
| /*------------------------------------------------------------------------------- */ |
| .globl out16 |
| out16: |
| sth r4,0x0000(r3) |
| blr |
| |
| /*------------------------------------------------------------------------------- */ |
| /* Function: out16r */ |
| /* Description: Byte reverse and output 16 bits */ |
| /*------------------------------------------------------------------------------- */ |
| .globl out16r |
| out16r: |
| sthbrx r4,r0,r3 |
| blr |
| |
| /*------------------------------------------------------------------------------- */ |
| /* Function: out32 */ |
| /* Description: Output 32 bits */ |
| /*------------------------------------------------------------------------------- */ |
| .globl out32 |
| out32: |
| stw r4,0x0000(r3) |
| blr |
| |
| /*------------------------------------------------------------------------------- */ |
| /* Function: out32r */ |
| /* Description: Byte reverse and output 32 bits */ |
| /*------------------------------------------------------------------------------- */ |
| .globl out32r |
| out32r: |
| stwbrx r4,r0,r3 |
| blr |
| |
| /*------------------------------------------------------------------------------- */ |
| /* Function: in16 */ |
| /* Description: Input 16 bits */ |
| /*------------------------------------------------------------------------------- */ |
| .globl in16 |
| in16: |
| lhz r3,0x0000(r3) |
| blr |
| |
| /*------------------------------------------------------------------------------- */ |
| /* Function: in16r */ |
| /* Description: Input 16 bits and byte reverse */ |
| /*------------------------------------------------------------------------------- */ |
| .globl in16r |
| in16r: |
| lhbrx r3,r0,r3 |
| blr |
| |
| /*------------------------------------------------------------------------------- */ |
| /* Function: in32 */ |
| /* Description: Input 32 bits */ |
| /*------------------------------------------------------------------------------- */ |
| .globl in32 |
| in32: |
| lwz 3,0x0000(3) |
| blr |
| |
| /*------------------------------------------------------------------------------- */ |
| /* Function: in32r */ |
| /* Description: Input 32 bits and byte reverse */ |
| /*------------------------------------------------------------------------------- */ |
| .globl in32r |
| in32r: |
| lwbrx r3,r0,r3 |
| blr |
| |
| /*------------------------------------------------------------------------------- */ |
| /* Function: ppcDcbf */ |
| /* Description: Data Cache block flush */ |
| /* Input: r3 = effective address */ |
| /* Output: none. */ |
| /*------------------------------------------------------------------------------- */ |
| .globl ppcDcbf |
| ppcDcbf: |
| dcbf r0,r3 |
| blr |
| |
| /*------------------------------------------------------------------------------- */ |
| /* Function: ppcDcbi */ |
| /* Description: Data Cache block Invalidate */ |
| /* Input: r3 = effective address */ |
| /* Output: none. */ |
| /*------------------------------------------------------------------------------- */ |
| .globl ppcDcbi |
| ppcDcbi: |
| dcbi r0,r3 |
| blr |
| |
| /*------------------------------------------------------------------------------- */ |
| /* Function: ppcSync */ |
| /* Description: Processor Synchronize */ |
| /* Input: none. */ |
| /* Output: none. */ |
| /*------------------------------------------------------------------------------- */ |
| .globl ppcSync |
| ppcSync: |
| sync |
| blr |
| |
| /*------------------------------------------------------------------------------*/ |
| |
| #ifndef CONFIG_NAND_SPL |
| /* |
| * void relocate_code (addr_sp, gd, addr_moni) |
| * |
| * This "function" does not return, instead it continues in RAM |
| * after relocating the monitor code. |
| * |
| * r3 = dest |
| * r4 = src |
| * r5 = length in bytes |
| * r6 = cachelinesize |
| */ |
| .globl relocate_code |
| relocate_code: |
| #if defined(CONFIG_440EP) || defined(CONFIG_440GR) || \ |
| defined(CONFIG_440EPX) || defined(CONFIG_440GRX) || \ |
| defined(CONFIG_440SPE) |
| /* |
| * On some 440er platforms the cache is enabled in the first TLB (Boot-CS) |
| * to speed up the boot process. Now this cache needs to be disabled. |
| */ |
| iccci 0,0 /* Invalidate inst cache */ |
| dccci 0,0 /* Invalidate data cache, now no longer our stack */ |
| sync |
| isync |
| addi r1,r0,0x0000 /* TLB entry #0 */ |
| tlbre r0,r1,0x0002 /* Read contents */ |
| ori r0,r0,0x0c00 /* Or in the inhibit, write through bit */ |
| tlbwe r0,r1,0x0002 /* Save it out */ |
| sync |
| isync |
| #endif |
| mr r1, r3 /* Set new stack pointer */ |
| mr r9, r4 /* Save copy of Init Data pointer */ |
| mr r10, r5 /* Save copy of Destination Address */ |
| |
| mr r3, r5 /* Destination Address */ |
| lis r4, CFG_MONITOR_BASE@h /* Source Address */ |
| ori r4, r4, CFG_MONITOR_BASE@l |
| lwz r5, GOT(__init_end) |
| sub r5, r5, r4 |
| li r6, CFG_CACHELINE_SIZE /* Cache Line Size */ |
| |
| /* |
| * Fix GOT pointer: |
| * |
| * New GOT-PTR = (old GOT-PTR - CFG_MONITOR_BASE) + Destination Address |
| * |
| * Offset: |
| */ |
| sub r15, r10, r4 |
| |
| /* First our own GOT */ |
| add r14, r14, r15 |
| /* the the one used by the C code */ |
| add r30, r30, r15 |
| |
| /* |
| * Now relocate code |
| */ |
| |
| cmplw cr1,r3,r4 |
| addi r0,r5,3 |
| srwi. r0,r0,2 |
| beq cr1,4f /* In place copy is not necessary */ |
| beq 7f /* Protect against 0 count */ |
| mtctr r0 |
| bge cr1,2f |
| |
| la r8,-4(r4) |
| la r7,-4(r3) |
| 1: lwzu r0,4(r8) |
| stwu r0,4(r7) |
| bdnz 1b |
| b 4f |
| |
| 2: slwi r0,r0,2 |
| add r8,r4,r0 |
| add r7,r3,r0 |
| 3: lwzu r0,-4(r8) |
| stwu r0,-4(r7) |
| bdnz 3b |
| |
| /* |
| * Now flush the cache: note that we must start from a cache aligned |
| * address. Otherwise we might miss one cache line. |
| */ |
| 4: cmpwi r6,0 |
| add r5,r3,r5 |
| beq 7f /* Always flush prefetch queue in any case */ |
| subi r0,r6,1 |
| andc r3,r3,r0 |
| mr r4,r3 |
| 5: dcbst 0,r4 |
| add r4,r4,r6 |
| cmplw r4,r5 |
| blt 5b |
| sync /* Wait for all dcbst to complete on bus */ |
| mr r4,r3 |
| 6: icbi 0,r4 |
| add r4,r4,r6 |
| cmplw r4,r5 |
| blt 6b |
| 7: sync /* Wait for all icbi to complete on bus */ |
| isync |
| |
| /* |
| * We are done. Do not return, instead branch to second part of board |
| * initialization, now running from RAM. |
| */ |
| |
| addi r0, r10, in_ram - _start + EXC_OFF_SYS_RESET |
| mtlr r0 |
| blr /* NEVER RETURNS! */ |
| |
| in_ram: |
| |
| /* |
| * Relocation Function, r14 point to got2+0x8000 |
| * |
| * Adjust got2 pointers, no need to check for 0, this code |
| * already puts a few entries in the table. |
| */ |
| li r0,__got2_entries@sectoff@l |
| la r3,GOT(_GOT2_TABLE_) |
| lwz r11,GOT(_GOT2_TABLE_) |
| mtctr r0 |
| sub r11,r3,r11 |
| addi r3,r3,-4 |
| 1: lwzu r0,4(r3) |
| add r0,r0,r11 |
| stw r0,0(r3) |
| bdnz 1b |
| |
| /* |
| * Now adjust the fixups and the pointers to the fixups |
| * in case we need to move ourselves again. |
| */ |
| 2: li r0,__fixup_entries@sectoff@l |
| lwz r3,GOT(_FIXUP_TABLE_) |
| cmpwi r0,0 |
| mtctr r0 |
| addi r3,r3,-4 |
| beq 4f |
| 3: lwzu r4,4(r3) |
| lwzux r0,r4,r11 |
| add r0,r0,r11 |
| stw r10,0(r3) |
| stw r0,0(r4) |
| bdnz 3b |
| 4: |
| clear_bss: |
| /* |
| * Now clear BSS segment |
| */ |
| lwz r3,GOT(__bss_start) |
| lwz r4,GOT(_end) |
| |
| cmplw 0, r3, r4 |
| beq 6f |
| |
| li r0, 0 |
| 5: |
| stw r0, 0(r3) |
| addi r3, r3, 4 |
| cmplw 0, r3, r4 |
| bne 5b |
| 6: |
| |
| mr r3, r9 /* Init Data pointer */ |
| mr r4, r10 /* Destination Address */ |
| bl board_init_r |
| |
| /* |
| * Copy exception vector code to low memory |
| * |
| * r3: dest_addr |
| * r7: source address, r8: end address, r9: target address |
| */ |
| .globl trap_init |
| trap_init: |
| lwz r7, GOT(_start) |
| lwz r8, GOT(_end_of_vectors) |
| |
| li r9, 0x100 /* reset vector always at 0x100 */ |
| |
| cmplw 0, r7, r8 |
| bgelr /* return if r7>=r8 - just in case */ |
| |
| mflr r4 /* save link register */ |
| 1: |
| lwz r0, 0(r7) |
| stw r0, 0(r9) |
| addi r7, r7, 4 |
| addi r9, r9, 4 |
| cmplw 0, r7, r8 |
| bne 1b |
| |
| /* |
| * relocate `hdlr' and `int_return' entries |
| */ |
| li r7, .L_MachineCheck - _start + EXC_OFF_SYS_RESET |
| li r8, Alignment - _start + EXC_OFF_SYS_RESET |
| 2: |
| bl trap_reloc |
| addi r7, r7, 0x100 /* next exception vector */ |
| cmplw 0, r7, r8 |
| blt 2b |
| |
| li r7, .L_Alignment - _start + EXC_OFF_SYS_RESET |
| bl trap_reloc |
| |
| li r7, .L_ProgramCheck - _start + EXC_OFF_SYS_RESET |
| bl trap_reloc |
| |
| li r7, .L_FPUnavailable - _start + EXC_OFF_SYS_RESET |
| li r8, SystemCall - _start + EXC_OFF_SYS_RESET |
| 3: |
| bl trap_reloc |
| addi r7, r7, 0x100 /* next exception vector */ |
| cmplw 0, r7, r8 |
| blt 3b |
| |
| li r7, .L_SingleStep - _start + EXC_OFF_SYS_RESET |
| li r8, _end_of_vectors - _start + EXC_OFF_SYS_RESET |
| 4: |
| bl trap_reloc |
| addi r7, r7, 0x100 /* next exception vector */ |
| cmplw 0, r7, r8 |
| blt 4b |
| |
| #if !defined(CONFIG_440) |
| addi r7,r0,0x1000 /* set ME bit (Machine Exceptions) */ |
| oris r7,r7,0x0002 /* set CE bit (Critical Exceptions) */ |
| mtmsr r7 /* change MSR */ |
| #else |
| bl __440_msr_set |
| b __440_msr_continue |
| |
| __440_msr_set: |
| addi r7,r0,0x1000 /* set ME bit (Machine Exceptions) */ |
| oris r7,r7,0x0002 /* set CE bit (Critical Exceptions) */ |
| mtspr srr1,r7 |
| mflr r7 |
| mtspr srr0,r7 |
| rfi |
| __440_msr_continue: |
| #endif |
| |
| mtlr r4 /* restore link register */ |
| blr |
| |
| /* |
| * Function: relocate entries for one exception vector |
| */ |
| trap_reloc: |
| lwz r0, 0(r7) /* hdlr ... */ |
| add r0, r0, r3 /* ... += dest_addr */ |
| stw r0, 0(r7) |
| |
| lwz r0, 4(r7) /* int_return ... */ |
| add r0, r0, r3 /* ... += dest_addr */ |
| stw r0, 4(r7) |
| |
| blr |
| #endif /* CONFIG_NAND_SPL */ |
| |
| |
| /**************************************************************************/ |
| /* PPC405EP specific stuff */ |
| /**************************************************************************/ |
| #ifdef CONFIG_405EP |
| ppc405ep_init: |
| |
| #ifdef CONFIG_BUBINGA |
| /* |
| * Initialize EBC chip selects 1 & 4 and GPIO pins (for alternate |
| * function) to support FPGA and NVRAM accesses below. |
| */ |
| |
| lis r3,GPIO0_OSRH@h /* config GPIO output select */ |
| ori r3,r3,GPIO0_OSRH@l |
| lis r4,CFG_GPIO0_OSRH@h |
| ori r4,r4,CFG_GPIO0_OSRH@l |
| stw r4,0(r3) |
| lis r3,GPIO0_OSRL@h |
| ori r3,r3,GPIO0_OSRL@l |
| lis r4,CFG_GPIO0_OSRL@h |
| ori r4,r4,CFG_GPIO0_OSRL@l |
| stw r4,0(r3) |
| |
| lis r3,GPIO0_ISR1H@h /* config GPIO input select */ |
| ori r3,r3,GPIO0_ISR1H@l |
| lis r4,CFG_GPIO0_ISR1H@h |
| ori r4,r4,CFG_GPIO0_ISR1H@l |
| stw r4,0(r3) |
| lis r3,GPIO0_ISR1L@h |
| ori r3,r3,GPIO0_ISR1L@l |
| lis r4,CFG_GPIO0_ISR1L@h |
| ori r4,r4,CFG_GPIO0_ISR1L@l |
| stw r4,0(r3) |
| |
| lis r3,GPIO0_TSRH@h /* config GPIO three-state select */ |
| ori r3,r3,GPIO0_TSRH@l |
| lis r4,CFG_GPIO0_TSRH@h |
| ori r4,r4,CFG_GPIO0_TSRH@l |
| stw r4,0(r3) |
| lis r3,GPIO0_TSRL@h |
| ori r3,r3,GPIO0_TSRL@l |
| lis r4,CFG_GPIO0_TSRL@h |
| ori r4,r4,CFG_GPIO0_TSRL@l |
| stw r4,0(r3) |
| |
| lis r3,GPIO0_TCR@h /* config GPIO driver output enables */ |
| ori r3,r3,GPIO0_TCR@l |
| lis r4,CFG_GPIO0_TCR@h |
| ori r4,r4,CFG_GPIO0_TCR@l |
| stw r4,0(r3) |
| |
| li r3,pb1ap /* program EBC bank 1 for RTC access */ |
| mtdcr ebccfga,r3 |
| lis r3,CFG_EBC_PB1AP@h |
| ori r3,r3,CFG_EBC_PB1AP@l |
| mtdcr ebccfgd,r3 |
| li r3,pb1cr |
| mtdcr ebccfga,r3 |
| lis r3,CFG_EBC_PB1CR@h |
| ori r3,r3,CFG_EBC_PB1CR@l |
| mtdcr ebccfgd,r3 |
| |
| li r3,pb1ap /* program EBC bank 1 for RTC access */ |
| mtdcr ebccfga,r3 |
| lis r3,CFG_EBC_PB1AP@h |
| ori r3,r3,CFG_EBC_PB1AP@l |
| mtdcr ebccfgd,r3 |
| li r3,pb1cr |
| mtdcr ebccfga,r3 |
| lis r3,CFG_EBC_PB1CR@h |
| ori r3,r3,CFG_EBC_PB1CR@l |
| mtdcr ebccfgd,r3 |
| |
| li r3,pb4ap /* program EBC bank 4 for FPGA access */ |
| mtdcr ebccfga,r3 |
| lis r3,CFG_EBC_PB4AP@h |
| ori r3,r3,CFG_EBC_PB4AP@l |
| mtdcr ebccfgd,r3 |
| li r3,pb4cr |
| mtdcr ebccfga,r3 |
| lis r3,CFG_EBC_PB4CR@h |
| ori r3,r3,CFG_EBC_PB4CR@l |
| mtdcr ebccfgd,r3 |
| #endif |
| |
| #ifndef CFG_CPC0_PCI |
| li r3,CPC0_PCI_HOST_CFG_EN |
| #ifdef CONFIG_BUBINGA |
| /* |
| !----------------------------------------------------------------------- |
| ! Check FPGA for PCI internal/external arbitration |
| ! If board is set to internal arbitration, update cpc0_pci |
| !----------------------------------------------------------------------- |
| */ |
| addis r5,r0,FPGA_REG1@h /* set offset for FPGA_REG1 */ |
| ori r5,r5,FPGA_REG1@l |
| lbz r5,0x0(r5) /* read to get PCI arb selection */ |
| andi. r6,r5,FPGA_REG1_PCI_INT_ARB /* using internal arbiter ?*/ |
| beq ..pci_cfg_set /* if not set, then bypass reg write*/ |
| #endif |
| ori r3,r3,CPC0_PCI_ARBIT_EN |
| #else /* CFG_CPC0_PCI */ |
| li r3,CFG_CPC0_PCI |
| #endif /* CFG_CPC0_PCI */ |
| ..pci_cfg_set: |
| mtdcr CPC0_PCI, r3 /* Enable internal arbiter*/ |
| |
| /* |
| !----------------------------------------------------------------------- |
| ! Check to see if chip is in bypass mode. |
| ! If so, write stored CPC0_PLLMR0 and CPC0_PLLMR1 values and perform a |
| ! CPU reset Otherwise, skip this step and keep going. |
| ! Note: Running BIOS in bypass mode is not supported since PLB speed |
| ! will not be fast enough for the SDRAM (min 66MHz) |
| !----------------------------------------------------------------------- |
| */ |
| mfdcr r5, CPC0_PLLMR1 |
| rlwinm r4,r5,1,0x1 /* get system clock source (SSCS) */ |
| cmpi cr0,0,r4,0x1 |
| |
| beq pll_done /* if SSCS =b'1' then PLL has */ |
| /* already been set */ |
| /* and CPU has been reset */ |
| /* so skip to next section */ |
| |
| #ifdef CONFIG_BUBINGA |
| /* |
| !----------------------------------------------------------------------- |
| ! Read NVRAM to get value to write in PLLMR. |
| ! If value has not been correctly saved, write default value |
| ! Default config values (assuming on-board 33MHz SYS_CLK) are above. |
| ! See CPU_DEFAULT_200 and CPU_DEFAULT_266 above. |
| ! |
| ! WARNING: This code assumes the first three words in the nvram_t |
| ! structure in openbios.h. Changing the beginning of |
| ! the structure will break this code. |
| ! |
| !----------------------------------------------------------------------- |
| */ |
| addis r3,0,NVRAM_BASE@h |
| addi r3,r3,NVRAM_BASE@l |
| |
| lwz r4, 0(r3) |
| addis r5,0,NVRVFY1@h |
| addi r5,r5,NVRVFY1@l |
| cmp cr0,0,r4,r5 /* Compare 1st NVRAM Magic number*/ |
| bne ..no_pllset |
| addi r3,r3,4 |
| lwz r4, 0(r3) |
| addis r5,0,NVRVFY2@h |
| addi r5,r5,NVRVFY2@l |
| cmp cr0,0,r4,r5 /* Compare 2 NVRAM Magic number */ |
| bne ..no_pllset |
| addi r3,r3,8 /* Skip over conf_size */ |
| lwz r4, 4(r3) /* Load PLLMR1 value from NVRAM */ |
| lwz r3, 0(r3) /* Load PLLMR0 value from NVRAM */ |
| rlwinm r5,r4,1,0x1 /* get system clock source (SSCS) */ |
| cmpi cr0,0,r5,1 /* See if PLL is locked */ |
| beq pll_write |
| ..no_pllset: |
| #endif /* CONFIG_BUBINGA */ |
| |
| addis r3,0,PLLMR0_DEFAULT@h /* PLLMR0 default value */ |
| ori r3,r3,PLLMR0_DEFAULT@l /* */ |
| addis r4,0,PLLMR1_DEFAULT@h /* PLLMR1 default value */ |
| ori r4,r4,PLLMR1_DEFAULT@l /* */ |
| |
| b pll_write /* Write the CPC0_PLLMR with new value */ |
| |
| pll_done: |
| /* |
| !----------------------------------------------------------------------- |
| ! Clear Soft Reset Register |
| ! This is needed to enable PCI if not booting from serial EPROM |
| !----------------------------------------------------------------------- |
| */ |
| addi r3, 0, 0x0 |
| mtdcr CPC0_SRR, r3 |
| |
| addis r3,0,0x0010 |
| mtctr r3 |
| pci_wait: |
| bdnz pci_wait |
| |
| blr /* return to main code */ |
| |
| /* |
| !----------------------------------------------------------------------------- |
| ! Function: pll_write |
| ! Description: Updates the value of the CPC0_PLLMR according to CMOS27E documentation |
| ! That is: |
| ! 1. Pll is first disabled (de-activated by putting in bypass mode) |
| ! 2. PLL is reset |
| ! 3. Clock dividers are set while PLL is held in reset and bypassed |
| ! 4. PLL Reset is cleared |
| ! 5. Wait 100us for PLL to lock |
| ! 6. A core reset is performed |
| ! Input: r3 = Value to write to CPC0_PLLMR0 |
| ! Input: r4 = Value to write to CPC0_PLLMR1 |
| ! Output r3 = none |
| !----------------------------------------------------------------------------- |
| */ |
| pll_write: |
| mfdcr r5, CPC0_UCR |
| andis. r5,r5,0xFFFF |
| ori r5,r5,0x0101 /* Stop the UART clocks */ |
| mtdcr CPC0_UCR,r5 /* Before changing PLL */ |
| |
| mfdcr r5, CPC0_PLLMR1 |
| rlwinm r5,r5,0,0x7FFFFFFF /* Disable PLL */ |
| mtdcr CPC0_PLLMR1,r5 |
| oris r5,r5,0x4000 /* Set PLL Reset */ |
| mtdcr CPC0_PLLMR1,r5 |
| |
| mtdcr CPC0_PLLMR0,r3 /* Set clock dividers */ |
| rlwinm r5,r4,0,0x3FFFFFFF /* Reset & Bypass new PLL dividers */ |
| oris r5,r5,0x4000 /* Set PLL Reset */ |
| mtdcr CPC0_PLLMR1,r5 /* Set clock dividers */ |
| rlwinm r5,r5,0,0xBFFFFFFF /* Clear PLL Reset */ |
| mtdcr CPC0_PLLMR1,r5 |
| |
| /* |
| ! Wait min of 100us for PLL to lock. |
| ! See CMOS 27E databook for more info. |
| ! At 200MHz, that means waiting 20,000 instructions |
| */ |
| addi r3,0,20000 /* 2000 = 0x4e20 */ |
| mtctr r3 |
| pll_wait: |
| bdnz pll_wait |
| |
| oris r5,r5,0x8000 /* Enable PLL */ |
| mtdcr CPC0_PLLMR1,r5 /* Engage */ |
| |
| /* |
| * Reset CPU to guarantee timings are OK |
| * Not sure if this is needed... |
| */ |
| addis r3,0,0x1000 |
| mtspr dbcr0,r3 /* This will cause a CPU core reset, and */ |
| /* execution will continue from the poweron */ |
| /* vector of 0xfffffffc */ |
| #endif /* CONFIG_405EP */ |
