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u-boot/arch/powerpc/cpu/ppc4xx/start.S
Stefan Roese 345b77baca ppc4xx: Remove 4xx NAND booting support 
As ppc4xx currently only supports the deprecated nand_spl infrastructure
and nobody seems to have time / resources to port this over to the newer
SPL infrastructure, lets remove NAND booting completely.

This should not affect the "normal", non NAND-booting ppc4xx platforms
that are currently supported.

Signed-off-by: Stefan Roese <sr@denx.de>
Cc: Wolfgang Denk <wd@denx.de>
Cc: Tirumala Marri <tmarri@apm.com>
Cc: Matthias Fuchs <matthias.fuchs@esd.eu>
Cc: Masahiro Yamada <yamada.m@jp.panasonic.com>
Cc: Tom Rini <trini@ti.com>
Tested-by: Matthias Fuchs <matthias.fuchs@esd.eu>
2014-03-07 10:59:06 -05:00

1954 lines
53 KiB
ArmAsm
Raw Blame History

/*
* 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>
* Copyright (C) 2007 Stefan Roese <sr@denx.de>, DENX Software Engineering
* Copyright (c) 2008 Nuovation System Designs, LLC
* Grant Erickson <gerickson@nuovations.com>
*
* SPDX-License-Identifier: GPL-2.0 IBM-pibs
*/
/*
* Startup code for IBM/AMCC PowerPC 4xx (PPC4xx) based boards
*
* The following description only applies to the NOR flash style booting.
* NAND booting is different. For more details about NAND booting on 4xx
* take a look at doc/README.nand-boot-ppc440.
*
* The CPU starts at address 0xfffffffc (last word in the address space).
* The U-Boot image therefore has to be located in the "upper" area of the
* flash (e.g. 512MiB - 0xfff80000 ... 0xffffffff). The default value for
* the boot chip-select (CS0) is quite big and covers this area. On the
* 405EX this is for example 0xffe00000 ... 0xffffffff. U-Boot will
* reconfigure this CS0 (and other chip-selects as well when configured
* this way) in the boot process to the "correct" values matching the
* board layout.
*/
#include <asm-offsets.h>
#include <config.h>
#include <asm/ppc4xx.h>
#include <version.h>
#include <ppc_asm.tmpl>
#include <ppc_defs.h>
#include <asm/cache.h>
#include <asm/mmu.h>
#include <asm/ppc4xx-isram.h>
#ifdef CONFIG_SYS_INIT_DCACHE_CS
# if (CONFIG_SYS_INIT_DCACHE_CS == 0)
# define PBxAP PB1AP
# define PBxCR PB0CR
# if (defined(CONFIG_SYS_EBC_PB0AP) && defined(CONFIG_SYS_EBC_PB0CR))
# define PBxAP_VAL CONFIG_SYS_EBC_PB0AP
# define PBxCR_VAL CONFIG_SYS_EBC_PB0CR
# endif
# endif
# if (CONFIG_SYS_INIT_DCACHE_CS == 1)
# define PBxAP PB1AP
# define PBxCR PB1CR
# if (defined(CONFIG_SYS_EBC_PB1AP) && defined(CONFIG_SYS_EBC_PB1CR))
# define PBxAP_VAL CONFIG_SYS_EBC_PB1AP
# define PBxCR_VAL CONFIG_SYS_EBC_PB1CR
# endif
# endif
# if (CONFIG_SYS_INIT_DCACHE_CS == 2)
# define PBxAP PB2AP
# define PBxCR PB2CR
# if (defined(CONFIG_SYS_EBC_PB2AP) && defined(CONFIG_SYS_EBC_PB2CR))
# define PBxAP_VAL CONFIG_SYS_EBC_PB2AP
# define PBxCR_VAL CONFIG_SYS_EBC_PB2CR
# endif
# endif
# if (CONFIG_SYS_INIT_DCACHE_CS == 3)
# define PBxAP PB3AP
# define PBxCR PB3CR
# if (defined(CONFIG_SYS_EBC_PB3AP) && defined(CONFIG_SYS_EBC_PB3CR))
# define PBxAP_VAL CONFIG_SYS_EBC_PB3AP
# define PBxCR_VAL CONFIG_SYS_EBC_PB3CR
# endif
# endif
# if (CONFIG_SYS_INIT_DCACHE_CS == 4)
# define PBxAP PB4AP
# define PBxCR PB4CR
# if (defined(CONFIG_SYS_EBC_PB4AP) && defined(CONFIG_SYS_EBC_PB4CR))
# define PBxAP_VAL CONFIG_SYS_EBC_PB4AP
# define PBxCR_VAL CONFIG_SYS_EBC_PB4CR
# endif
# endif
# if (CONFIG_SYS_INIT_DCACHE_CS == 5)
# define PBxAP PB5AP
# define PBxCR PB5CR
# if (defined(CONFIG_SYS_EBC_PB5AP) && defined(CONFIG_SYS_EBC_PB5CR))
# define PBxAP_VAL CONFIG_SYS_EBC_PB5AP
# define PBxCR_VAL CONFIG_SYS_EBC_PB5CR
# endif
# endif
# if (CONFIG_SYS_INIT_DCACHE_CS == 6)
# define PBxAP PB6AP
# define PBxCR PB6CR
# if (defined(CONFIG_SYS_EBC_PB6AP) && defined(CONFIG_SYS_EBC_PB6CR))
# define PBxAP_VAL CONFIG_SYS_EBC_PB6AP
# define PBxCR_VAL CONFIG_SYS_EBC_PB6CR
# endif
# endif
# if (CONFIG_SYS_INIT_DCACHE_CS == 7)
# define PBxAP PB7AP
# define PBxCR PB7CR
# if (defined(CONFIG_SYS_EBC_PB7AP) && defined(CONFIG_SYS_EBC_PB7CR))
# define PBxAP_VAL CONFIG_SYS_EBC_PB7AP
# define PBxCR_VAL CONFIG_SYS_EBC_PB7CR
# endif
# endif
# ifndef PBxAP_VAL
# define PBxAP_VAL 0
# endif
# ifndef PBxCR_VAL
# define PBxCR_VAL 0
# endif
/*
* Memory Bank x (nothingness) initialization CONFIG_SYS_INIT_RAM_ADDR + 64 MiB
* used as temporary stack pointer for the primordial stack
*/
# ifndef CONFIG_SYS_INIT_DCACHE_PBxAR
# define CONFIG_SYS_INIT_DCACHE_PBxAR (EBC_BXAP_BME_DISABLED | \
EBC_BXAP_TWT_ENCODE(7) | \
EBC_BXAP_BCE_DISABLE | \
EBC_BXAP_BCT_2TRANS | \
EBC_BXAP_CSN_ENCODE(0) | \
EBC_BXAP_OEN_ENCODE(0) | \
EBC_BXAP_WBN_ENCODE(0) | \
EBC_BXAP_WBF_ENCODE(0) | \
EBC_BXAP_TH_ENCODE(2) | \
EBC_BXAP_RE_DISABLED | \
EBC_BXAP_SOR_NONDELAYED | \
EBC_BXAP_BEM_WRITEONLY | \
EBC_BXAP_PEN_DISABLED)
# endif /* CONFIG_SYS_INIT_DCACHE_PBxAR */
# ifndef CONFIG_SYS_INIT_DCACHE_PBxCR
# define CONFIG_SYS_INIT_DCACHE_PBxCR (EBC_BXCR_BAS_ENCODE(CONFIG_SYS_INIT_RAM_ADDR) | \
EBC_BXCR_BS_64MB | \
EBC_BXCR_BU_RW | \
EBC_BXCR_BW_16BIT)
# endif /* CONFIG_SYS_INIT_DCACHE_PBxCR */
# ifndef CONFIG_SYS_INIT_RAM_PATTERN
# define CONFIG_SYS_INIT_RAM_PATTERN 0xDEADDEAD
# endif
#endif /* CONFIG_SYS_INIT_DCACHE_CS */
#if (defined(CONFIG_SYS_INIT_RAM_DCACHE) && (CONFIG_SYS_INIT_RAM_SIZE > (4 << 10)))
#error Only 4k of init-ram is supported - please adjust CONFIG_SYS_INIT_RAM_SIZE!
#endif
/*
* Unless otherwise overriden, enable two 128MB cachable instruction regions
* at CONFIG_SYS_SDRAM_BASE and another 128MB cacheable instruction region covering
* NOR flash at CONFIG_SYS_FLASH_BASE. Disable all cacheable data regions.
*/
#if !defined(CONFIG_SYS_FLASH_BASE)
/* If not already defined, set it to the "last" 128MByte region */
# define CONFIG_SYS_FLASH_BASE 0xf8000000
#endif
#if !defined(CONFIG_SYS_ICACHE_SACR_VALUE)
# define CONFIG_SYS_ICACHE_SACR_VALUE \
(PPC_128MB_SACR_VALUE(CONFIG_SYS_SDRAM_BASE + ( 0 << 20)) | \
PPC_128MB_SACR_VALUE(CONFIG_SYS_SDRAM_BASE + (128 << 20)) | \
PPC_128MB_SACR_VALUE(CONFIG_SYS_FLASH_BASE))
#endif /* !defined(CONFIG_SYS_ICACHE_SACR_VALUE) */
#if !defined(CONFIG_SYS_DCACHE_SACR_VALUE)
# define CONFIG_SYS_DCACHE_SACR_VALUE \
(0x00000000)
#endif /* !defined(CONFIG_SYS_DCACHE_SACR_VALUE) */
#if !defined(CONFIG_SYS_TLB_FOR_BOOT_FLASH)
#define CONFIG_SYS_TLB_FOR_BOOT_FLASH 0 /* use TLB 0 as default */
#endif
#define function_prolog(func_name) .text; \
.align 2; \
.globl func_name; \
func_name:
#define function_epilog(func_name) .type func_name,@function; \
.size func_name,.-func_name
/* We don't want the MMU yet.
*/
#undef MSR_KERNEL
#define MSR_KERNEL ( MSR_ME ) /* Machine Check */
.extern ext_bus_cntlr_init
/*
* Set up GOT: Global Offset Table
*
* Use r12 to access the GOT
*/
#if !defined(CONFIG_SPL_BUILD)
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(__bss_end)
GOT_ENTRY(__bss_start)
END_GOT
#endif /* CONFIG_SPL_BUILD */
#if defined(CONFIG_SYS_RAMBOOT) || defined(CONFIG_BOOT_FROM_XMD)
/*
* 4xx RAM-booting U-Boot image is started from offset 0
*/
.text
bl _start_440
#endif
#if defined(CONFIG_SPL) && !defined(CONFIG_SPL_BUILD)
/*
* This is the entry of the real U-Boot from a board port
* that supports SPL booting on the PPC4xx. We only need
* to call board_init_f() here. Everything else has already
* been done in the SPL u-boot version.
*/
GET_GOT /* initialize GOT access */
bl board_init_f /* run 1st part of board init code (in Flash)*/
/* NOTREACHED - board_init_f() does not return */
#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)
.section .bootpg,"ax"
.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 SPRN_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 SPRN_SRR0,r0
mtspr SPRN_SRR1,r0
mtspr SPRN_CSRR0,r0
mtspr SPRN_CSRR1,r0
/* NOTE: 440GX adds machine check status regs */
#if defined(CONFIG_440) && !defined(CONFIG_440GP)
mtspr SPRN_MCSRR0,r0
mtspr SPRN_MCSRR1,r0
mfspr r1,SPRN_MCSR
mtspr SPRN_MCSR,r1
#endif
/*----------------------------------------------------------------*/
/* 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 SPRN_CCR0,r1
/*----------------------------------------------------------------*/
/* Initialize debug */
/*----------------------------------------------------------------*/
mfspr r1,SPRN_DBCR0
andis. r1, r1, 0x8000 /* test DBCR0[EDM] bit */
bne skip_debug_init /* if set, don't clear debug register */
mfspr r1,SPRN_CCR0
ori r1,r1,CCR0_DTB@l /* Disable Trace Broadcast */
mtspr SPRN_CCR0,r1
mtspr SPRN_DBCR0,r0
mtspr SPRN_DBCR1,r0
mtspr SPRN_DBCR2,r0
mtspr SPRN_IAC1,r0
mtspr SPRN_IAC2,r0
mtspr SPRN_IAC3,r0
mtspr SPRN_DAC1,r0
mtspr SPRN_DAC2,r0
mtspr SPRN_DVC1,r0
mtspr SPRN_DVC2,r0
mfspr r1,SPRN_DBSR
mtspr SPRN_DBSR,r1 /* Clear all valid bits */
skip_debug_init:
#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 SPRN_CCR1, r0
/*----------------------------------------------------------------+
| Reset the timebase.
| The previous write to CCR1 sets the timebase source.
+-----------------------------------------------------------------*/
mtspr SPRN_TBWL, r0
mtspr SPRN_TBWU, r0
#endif
/*----------------------------------------------------------------*/
/* Setup interrupt vectors */
/*----------------------------------------------------------------*/
mtspr SPRN_IVPR,r0 /* Vectors start at 0x0000_0000 */
li r1,0x0100
mtspr SPRN_IVOR0,r1 /* Critical input */
li r1,0x0200
mtspr SPRN_IVOR1,r1 /* Machine check */
li r1,0x0300
mtspr SPRN_IVOR2,r1 /* Data storage */
li r1,0x0400
mtspr SPRN_IVOR3,r1 /* Instruction storage */
li r1,0x0500
mtspr SPRN_IVOR4,r1 /* External interrupt */
li r1,0x0600
mtspr SPRN_IVOR5,r1 /* Alignment */
li r1,0x0700
mtspr SPRN_IVOR6,r1 /* Program check */
li r1,0x0800
mtspr SPRN_IVOR7,r1 /* Floating point unavailable */
li r1,0x0c00
mtspr SPRN_IVOR8,r1 /* System call */
li r1,0x0a00
mtspr SPRN_IVOR9,r1 /* Auxiliary Processor unavailable */
li r1,0x0900
mtspr SPRN_IVOR10,r1 /* Decrementer */
li r1,0x1300
mtspr SPRN_IVOR13,r1 /* Data TLB error */
li r1,0x1400
mtspr SPRN_IVOR14,r1 /* Instr TLB error */
li r1,0x2000
mtspr SPRN_IVOR15,r1 /* Debug */
/*----------------------------------------------------------------*/
/* Configure cache regions */
/*----------------------------------------------------------------*/
mtspr SPRN_INV0,r0
mtspr SPRN_INV1,r0
mtspr SPRN_INV2,r0
mtspr SPRN_INV3,r0
mtspr SPRN_DNV0,r0
mtspr SPRN_DNV1,r0
mtspr SPRN_DNV2,r0
mtspr SPRN_DNV3,r0
mtspr SPRN_ITV0,r0
mtspr SPRN_ITV1,r0
mtspr SPRN_ITV2,r0
mtspr SPRN_ITV3,r0
mtspr SPRN_DTV0,r0
mtspr SPRN_DTV1,r0
mtspr SPRN_DTV2,r0
mtspr SPRN_DTV3,r0
/*----------------------------------------------------------------*/
/* Cache victim limits */
/*----------------------------------------------------------------*/
/* floors 0, ceiling max to use the entire cache -- nothing locked
*/
lis r1,0x0001
ori r1,r1,0xf800
mtspr SPRN_IVLIM,r1
mtspr SPRN_DVLIM,r1
/*----------------------------------------------------------------+
|Initialize MMUCR[STID] = 0.
+-----------------------------------------------------------------*/
mfspr r0,SPRN_MMUCR
addis r1,0,0xFFFF
ori r1,r1,0xFF00
and r0,r0,r1
mtspr SPRN_MMUCR,r0
/*----------------------------------------------------------------*/
/* Clear all TLB entries -- TID = 0, TS = 0 */
/*----------------------------------------------------------------*/
addis r0,0,0x0000
#ifdef CONFIG_SYS_RAMBOOT
li r4,0 /* Start with TLB #0 */
#else
li r4,1 /* Start with TLB #1 */
#endif
li r1,64 /* 64 TLB entries */
sub r1,r1,r4 /* calculate last TLB # */
mtctr r1
rsttlb:
#ifdef CONFIG_SYS_RAMBOOT
tlbre r3,r4,0 /* Read contents from TLB word #0 to get EPN */
rlwinm. r3,r3,0,0xfffffc00 /* Mask EPN */
beq tlbnxt /* Skip EPN=0 TLB, this is the SDRAM TLB */
#endif
tlbwe r0,r4,0 /* Invalidate all entries (V=0)*/
tlbwe r0,r4,1
tlbwe r0,r4,2
tlbnxt: addi r4,r4,1 /* Next TLB */
bdnz rsttlb
/*----------------------------------------------------------------*/
/* TLB entry setup -- step thru tlbtab */
/*----------------------------------------------------------------*/
#if defined(CONFIG_440SPE_REVA)
/*----------------------------------------------------------------*/
/* 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:
#ifdef CONFIG_SYS_RAMBOOT
tlbre r3,r4,0 /* Read contents from TLB word #0 */
rlwinm. r3,r3,0,0x00000200 /* Mask V (valid) bit */
bne tlbnx2 /* Skip V=1 TLB, this is the SDRAM TLB */
#endif
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 */
tlbnx2: addi r4,r4,1 /* Next TLB */
bdnz 1b
/*----------------------------------------------------------------*/
/* Continue from 'normal' start */
/*----------------------------------------------------------------*/
2:
bl 3f
b _start
3: li r0,0
mtspr SPRN_SRR1,r0 /* Keep things disabled for now */
mflr r1
mtspr SPRN_SRR0,r1
rfi
#endif /* CONFIG_440 */
/*
* r3 - 1st arg to board_init(): IMMP pointer
* r4 - 2nd arg to board_init(): boot flag
*/
#if !defined(CONFIG_SPL_BUILD)
.text
.long 0x27051956 /* U-Boot Magic Number */
.globl version_string
version_string:
.ascii U_BOOT_VERSION_STRING, "\0"
. = EXC_OFF_SYS_RESET
.globl _start_of_vectors
_start_of_vectors:
/* Critical input. */
CRIT_EXCEPTION(0x100, CritcalInput, UnknownException)
#ifdef CONFIG_440
/* Machine check */
MCK_EXCEPTION(0x200, MachineCheck, MachineCheckException)
#else
CRIT_EXCEPTION(0x200, MachineCheck, MachineCheckException)
#endif /* CONFIG_440 */
/* 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(SRR0, SRR1)
mfspr r4,DAR
stw r4,_DAR(r21)
mfspr r5,DSISR
stw r5,_DSISR(r21)
addi r3,r1,STACK_FRAME_OVERHEAD
EXC_XFER_TEMPLATE(Alignment, AlignmentException, MSR_KERNEL, COPY_EE)
/* Program check exception */
. = 0x700
ProgramCheck:
EXCEPTION_PROLOG(SRR0, SRR1)
addi r3,r1,STACK_FRAME_OVERHEAD
EXC_XFER_TEMPLATE(ProgramCheck, ProgramCheckException,
MSR_KERNEL, COPY_EE)
#ifdef CONFIG_440
STD_EXCEPTION(0x800, FPUnavailable, UnknownException)
STD_EXCEPTION(0x900, Decrementer, DecrementerPITException)
STD_EXCEPTION(0xa00, APU, UnknownException)
#endif
STD_EXCEPTION(0xc00, SystemCall, UnknownException)
#ifdef CONFIG_440
STD_EXCEPTION(0x1300, DataTLBError, UnknownException)
STD_EXCEPTION(0x1400, InstructionTLBError, UnknownException)
#else
STD_EXCEPTION(0x1000, PIT, DecrementerPITException)
STD_EXCEPTION(0x1100, InstructionTLBMiss, UnknownException)
STD_EXCEPTION(0x1200, DataTLBMiss, UnknownException)
#endif
CRIT_EXCEPTION(0x2000, DebugBreakpoint, DebugException )
.globl _end_of_vectors
_end_of_vectors:
. = _START_OFFSET
#endif
.globl _start
_start:
#if defined(CONFIG_SPL) && !defined(CONFIG_SPL_BUILD)
/*
* This is the entry of the real U-Boot from a board port
* that supports SPL booting on the PPC4xx. We only need
* to call board_init_f() here. Everything else has already
* been done in the SPL u-boot version.
*/
GET_GOT /* initialize GOT access */
bl board_init_f /* run 1st part of board init code (in Flash)*/
/* NOTREACHED - board_init_f() does not return */
#endif
/*****************************************************************************/
#if defined(CONFIG_440)
/*----------------------------------------------------------------*/
/* Clear and set up some registers. */
/*----------------------------------------------------------------*/
li r0,0x0000
lis r1,0xffff
mtspr SPRN_DEC,r0 /* prevent dec exceptions */
mtspr SPRN_TBWL,r0 /* prevent fit & wdt exceptions */
mtspr SPRN_TBWU,r0
mtspr SPRN_TSR,r1 /* clear all timer exception status */
mtspr SPRN_TCR,r0 /* disable all */
mtspr SPRN_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 CONFIG_SYS_INIT_DBCR to the dbsr */
/* value you need in this case 0x8cff 0000 should do the trick */
/*----------------------------------------------------------------*/
#if defined(CONFIG_SYS_INIT_DBCR)
lis r1,0xffff
ori r1,r1,0xffff
mtspr SPRN_DBSR,r1 /* Clear all status bits */
lis r0,CONFIG_SYS_INIT_DBCR@h
ori r0,r0,CONFIG_SYS_INIT_DBCR@l
mtspr SPRN_DBCR0,r0
isync
#endif
/*----------------------------------------------------------------*/
/* Setup the internal SRAM */
/*----------------------------------------------------------------*/
li r0,0
#ifdef CONFIG_SYS_INIT_RAM_DCACHE
/* Clear Dcache to use as RAM */
addis r3,r0,CONFIG_SYS_INIT_RAM_ADDR@h
ori r3,r3,CONFIG_SYS_INIT_RAM_ADDR@l
addis r4,r0,CONFIG_SYS_INIT_RAM_SIZE@h
ori r4,r4,CONFIG_SYS_INIT_RAM_SIZE@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
/*
* Lock the init-ram/stack in d-cache, so that other regions
* may use d-cache as well
* Note, that this current implementation locks exactly 4k
* of d-cache, so please make sure that you don't define a
* bigger init-ram area. Take a look at the lwmon5 440EPx
* implementation as a reference.
*/
msync
isync
/* 8. set TFLOOR/NFLOOR to 8 (-> 8*16*32 bytes locked -> 4k) */
lis r1,0x0201
ori r1,r1,0xf808
mtspr SPRN_DVLIM,r1
lis r1,0x0808
ori r1,r1,0x0808
mtspr SPRN_DNV0,r1
mtspr SPRN_DNV1,r1
mtspr SPRN_DNV2,r1
mtspr SPRN_DNV3,r1
mtspr SPRN_DTV0,r1
mtspr SPRN_DTV1,r1
mtspr SPRN_DTV2,r1
mtspr SPRN_DTV3,r1
msync
isync
#endif /* CONFIG_SYS_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) || \
defined(CONFIG_460SX)
mtdcr L2_CACHE_CFG,r0 /* Ensure L2 Cache is off */
#elif defined(CONFIG_460EX) || defined(CONFIG_460GT) || \
defined(CONFIG_APM821XX)
lis r1, 0x0000
ori r1,r1,0x0008 /* Set L2_CACHE_CFG[RDBW]=1 */
mtdcr L2_CACHE_CFG,r1
#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) || defined(CONFIG_460EX) || \
defined(CONFIG_460GT) || defined(CONFIG_APM821XX)
lis r1,0x0000 /* BAS = X_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
#if defined(CONFIG_460EX) || defined(CONFIG_460GT) || \
defined(CONFIG_APM821XX)
lis r2,0x7fff
ori r2,r2,0xffff
mfdcr r1,ISRAM1_DPC
and r1,r1,r2 /* Disable parity check */
mtdcr ISRAM1_DPC,r1
mfdcr r1,ISRAM1_PMEG
and r1,r1,r2 /* Disable pwr mgmt */
mtdcr ISRAM1_PMEG,r1
lis r1,0x0004 /* BAS = 4_0004_0000 */
ori r1,r1,ISRAM1_SIZE /* ocm size */
mtdcr ISRAM1_SB0CR,r1
#endif
#elif defined(CONFIG_460SX)
lis r1,0x0000 /* BAS = 0000_0000 */
ori r1,r1,0x0B84 /* first 128k */
mtdcr ISRAM0_SB0CR,r1
lis r1,0x0001
ori r1,r1,0x0B84 /* second 128k */
mtdcr ISRAM0_SB1CR,r1
lis r1, 0x0002
ori r1,r1, 0x0B84 /* third 128k */
mtdcr ISRAM0_SB2CR,r1
lis r1, 0x0003
ori r1,r1, 0x0B84 /* fourth 128k */
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,CONFIG_SYS_INIT_RAM_ADDR@h
ori r1,r1,CONFIG_SYS_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) */
#ifndef CONFIG_SPL_BUILD
GET_GOT
#endif
bl cpu_init_f /* run low-level CPU init code (from Flash) */
bl board_init_f
/* NOTREACHED - board_init_f() does not return */
#endif /* CONFIG_440 */
/*****************************************************************************/
#if defined(CONFIG_405GP) || \
defined(CONFIG_405EP) || defined(CONFIG_405EZ) || \
defined(CONFIG_405EX) || defined(CONFIG_405)
/*----------------------------------------------------------------------- */
/* Clear and set up some registers. */
/*----------------------------------------------------------------------- */
addi r4,r0,0x0000
#if !defined(CONFIG_405EX)
mtspr SPRN_SGR,r4
#else
/*
* On 405EX, completely clearing the SGR leads to PPC hangup
* upon PCIe configuration access. The PCIe memory regions
* need to be guarded!
*/
lis r3,0x0000
ori r3,r3,0x7FFC
mtspr SPRN_SGR,r3
#endif
mtspr SPRN_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 the i- and d-caches. */
bl invalidate_icache
bl invalidate_dcache
/* Set-up icache cacheability. */
lis r4, CONFIG_SYS_ICACHE_SACR_VALUE@h
ori r4, r4, CONFIG_SYS_ICACHE_SACR_VALUE@l
mticcr r4
isync
/* Set-up dcache cacheability. */
lis r4, CONFIG_SYS_DCACHE_SACR_VALUE@h
ori r4, r4, CONFIG_SYS_DCACHE_SACR_VALUE@l
mtdccr r4
#if !(defined(CONFIG_SYS_EBC_PB0AP) && defined(CONFIG_SYS_EBC_PB0CR))\
&& !defined (CONFIG_XILINX_405)
/*----------------------------------------------------------------------- */
/* Tune the speed and size for flash CS0 */
/*----------------------------------------------------------------------- */
bl ext_bus_cntlr_init
#endif
#if !(defined(CONFIG_SYS_INIT_DCACHE_CS) || defined(CONFIG_SYS_TEMP_STACK_OCM))
/*
* For boards that don't have OCM and can't use the data cache
* for their primordial stack, setup stack here directly after the
* SDRAM is initialized in ext_bus_cntlr_init.
*/
lis r1, CONFIG_SYS_INIT_RAM_ADDR@h
ori r1,r1,CONFIG_SYS_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 /* !(CONFIG_SYS_INIT_DCACHE_CS || !CONFIG_SYS_TEM_STACK_OCM) */
#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(CONFIG_SYS_OCM_DATA_ADDR) && defined(CONFIG_SYS_OCM_DATA_SIZE)
#if defined(CONFIG_405EZ)
/********************************************************************
* Setup OCM - On Chip Memory - PPC405EZ uses OCM Controller V2
*******************************************************************/
/*
* We can map the OCM on the PLB3, so map it at
* CONFIG_SYS_OCM_DATA_ADDR + 0x8000
*/
lis r3,CONFIG_SYS_OCM_DATA_ADDR@h /* OCM location */
ori r3,r3,CONFIG_SYS_OCM_DATA_ADDR@l
ori r3,r3,0x0270 /* 16K for Bank 1, R/W/Enable */
mtdcr OCM0_PLBCR1,r3 /* Set PLB Access */
ori r3,r3,0x4000 /* Add 0x4000 for bank 2 */
mtdcr OCM0_PLBCR2,r3 /* Set PLB Access */
isync
lis r3,CONFIG_SYS_OCM_DATA_ADDR@h /* OCM location */
ori r3,r3,CONFIG_SYS_OCM_DATA_ADDR@l
ori r3,r3,0x0270 /* 16K for Bank 1, R/W/Enable */
mtdcr OCM0_DSRC1, r3 /* Set Data Side */
mtdcr OCM0_ISRC1, r3 /* Set Instruction Side */
ori r3,r3,0x4000 /* Add 0x4000 for bank 2 */
mtdcr OCM0_DSRC2, r3 /* Set Data Side */
mtdcr OCM0_ISRC2, r3 /* Set Instruction Side */
addis r3,0,0x0800 /* OCM Data Parity Disable - 1 Wait State */
mtdcr OCM0_DISDPC,r3
isync
#else /* CONFIG_405EZ */
/********************************************************************
* Setup OCM - On Chip Memory
*******************************************************************/
/* Setup OCM */
lis r0, 0x7FFF
ori r0, r0, 0xFFFF
mfdcr r3, OCM0_ISCNTL /* get instr-side IRAM config */
mfdcr r4, OCM0_DSCNTL /* get data-side IRAM config */
and r3, r3, r0 /* disable data-side IRAM */
and r4, r4, r0 /* disable data-side IRAM */
mtdcr OCM0_ISCNTL, r3 /* set instr-side IRAM config */
mtdcr OCM0_DSCNTL, r4 /* set data-side IRAM config */
isync
lis r3,CONFIG_SYS_OCM_DATA_ADDR@h /* OCM location */
ori r3,r3,CONFIG_SYS_OCM_DATA_ADDR@l
mtdcr OCM0_DSARC, r3
addis r4, 0, 0xC000 /* OCM data area enabled */
mtdcr OCM0_DSCNTL, r4
isync
#endif /* CONFIG_405EZ */
#endif
/*----------------------------------------------------------------------- */
/* Setup temporary stack in DCACHE or OCM if needed for SDRAM SPD. */
/*----------------------------------------------------------------------- */
#ifdef CONFIG_SYS_INIT_DCACHE_CS
li r4, PBxAP
mtdcr EBC0_CFGADDR, r4
lis r4, CONFIG_SYS_INIT_DCACHE_PBxAR@h
ori r4, r4, CONFIG_SYS_INIT_DCACHE_PBxAR@l
mtdcr EBC0_CFGDATA, r4
addi r4, 0, PBxCR
mtdcr EBC0_CFGADDR, r4
lis r4, CONFIG_SYS_INIT_DCACHE_PBxCR@h
ori r4, r4, CONFIG_SYS_INIT_DCACHE_PBxCR@l
mtdcr EBC0_CFGDATA, r4
/*
* Enable the data cache for the 128MB storage access control region
* at CONFIG_SYS_INIT_RAM_ADDR.
*/
mfdccr r4
oris r4, r4, PPC_128MB_SACR_VALUE(CONFIG_SYS_INIT_RAM_ADDR)@h
ori r4, r4, PPC_128MB_SACR_VALUE(CONFIG_SYS_INIT_RAM_ADDR)@l
mtdccr r4
/*
* Preallocate data cache lines to be used to avoid a subsequent
* cache miss and an ensuing machine check exception when exceptions
* are enabled.
*/
li r0, 0
lis r3, CONFIG_SYS_INIT_RAM_ADDR@h
ori r3, r3, CONFIG_SYS_INIT_RAM_ADDR@l
lis r4, CONFIG_SYS_INIT_RAM_SIZE@h
ori r4, r4, CONFIG_SYS_INIT_RAM_SIZE@l
/*
* Convert the size, in bytes, to the number of cache lines/blocks
* to preallocate.
*/
clrlwi. r5, r4, (32 - L1_CACHE_SHIFT)
srwi r5, r4, L1_CACHE_SHIFT
beq ..load_counter
addi r5, r5, 0x0001
..load_counter:
mtctr r5
/* Preallocate the computed number of cache blocks. */
..alloc_dcache_block:
dcba r0, r3
addi r3, r3, L1_CACHE_BYTES
bdnz ..alloc_dcache_block
sync
/*
* Load the initial stack pointer and data area and convert the size,
* in bytes, to the number of words to initialize to a known value.
*/
lis r1, CONFIG_SYS_INIT_RAM_ADDR@h
ori r1, r1, CONFIG_SYS_INIT_SP_OFFSET@l
lis r4, (CONFIG_SYS_INIT_RAM_SIZE >> 2)@h
ori r4, r4, (CONFIG_SYS_INIT_RAM_SIZE >> 2)@l
mtctr r4
lis r2, CONFIG_SYS_INIT_RAM_ADDR@h
ori r2, r2, CONFIG_SYS_INIT_RAM_SIZE@l
lis r4, CONFIG_SYS_INIT_RAM_PATTERN@h
ori r4, r4, CONFIG_SYS_INIT_RAM_PATTERN@l
..stackloop:
stwu r4, -4(r2)
bdnz ..stackloop
/*
* Make room for stack frame header and clear final stack frame so
* that stack backtraces terminate cleanly.
*/
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 */
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(CONFIG_SYS_TEMP_STACK_OCM) && \
(defined(CONFIG_SYS_OCM_DATA_ADDR) && defined(CONFIG_SYS_OCM_DATA_SIZE))
/*
* Stack in OCM.
*/
/* Set up Stack at top of OCM */
lis r1, (CONFIG_SYS_INIT_RAM_ADDR + CONFIG_SYS_INIT_SP_OFFSET)@h
ori r1, r1, (CONFIG_SYS_INIT_RAM_ADDR + CONFIG_SYS_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 /* CONFIG_SYS_INIT_DCACHE_CS */
GET_GOT /* initialize GOT access */
bl cpu_init_f /* run low-level CPU init code (from Flash) */
bl board_init_f /* run first part of init code (from Flash) */
/* NOTREACHED - board_init_f() does not return */
#endif /* CONFIG_405GP || CONFIG_405 || CONFIG_405EP */
/*----------------------------------------------------------------------- */
#if !defined(CONFIG_SPL_BUILD)
/*
* 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)
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 */
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 SPRN_CSRR0,r2
mtspr SPRN_CSRR1,r0
lwz r0,GPR0(r1)
lwz r2,GPR2(r1)
lwz r1,GPR1(r1)
SYNC
rfci
#ifdef CONFIG_440
mck_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 SPRN_MCSRR0,r2
mtspr SPRN_MCSRR1,r0
lwz r0,GPR0(r1)
lwz r2,GPR2(r1)
lwz r1,GPR1(r1)
SYNC
rfmci
#endif /* CONFIG_440 */
.globl get_pvr
get_pvr:
mfspr r3, PVR
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: 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: in32r */
/* Description: Input 32 bits and byte reverse */
/*------------------------------------------------------------------------------- */
.globl in32r
in32r:
lwbrx r3,r0,r3
blr
#if !defined(CONFIG_SPL_BUILD)
/*
* void relocate_code (addr_sp, gd, addr_moni)
*
* This "function" does not return, instead it continues in RAM
* after relocating the monitor code.
*
* r3 = Relocated stack pointer
* r4 = Relocated global data pointer
* r5 = Relocated text pointer
*/
.globl relocate_code
relocate_code:
#if defined(CONFIG_4xx_DCACHE) || defined(CONFIG_SYS_INIT_DCACHE_CS)
/*
* We need to flush the initial global data (gd_t) and bd_info
* before the dcache will be invalidated.
*/
/* Save registers */
mr r9, r3
mr r10, r4
mr r11, r5
/*
* Flush complete dcache, this is faster than flushing the
* ranges for global_data and bd_info instead.
*/
bl flush_dcache
#if defined(CONFIG_SYS_INIT_DCACHE_CS)
/*
* Undo the earlier data cache set-up for the primordial stack and
* data area. First, invalidate the data cache and then disable data
* cacheability for that area. Finally, restore the EBC values, if
* any.
*/
/* Invalidate the primordial stack and data area in cache */
lis r3, CONFIG_SYS_INIT_RAM_ADDR@h
ori r3, r3, CONFIG_SYS_INIT_RAM_ADDR@l
lis r4, CONFIG_SYS_INIT_RAM_SIZE@h
ori r4, r4, CONFIG_SYS_INIT_RAM_SIZE@l
add r4, r4, r3
bl invalidate_dcache_range
/* Disable cacheability for the region */
mfdccr r3
lis r4, ~PPC_128MB_SACR_VALUE(CONFIG_SYS_INIT_RAM_ADDR)@h
ori r4, r4, ~PPC_128MB_SACR_VALUE(CONFIG_SYS_INIT_RAM_ADDR)@l
and r3, r3, r4
mtdccr r3
/* Restore the EBC parameters */
li r3, PBxAP
mtdcr EBC0_CFGADDR, r3
lis r3, PBxAP_VAL@h
ori r3, r3, PBxAP_VAL@l
mtdcr EBC0_CFGDATA, r3
li r3, PBxCR
mtdcr EBC0_CFGADDR, r3
lis r3, PBxCR_VAL@h
ori r3, r3, PBxCR_VAL@l
mtdcr EBC0_CFGDATA, r3
#endif /* defined(CONFIG_SYS_INIT_DCACHE_CS) */
/* Restore registers */
mr r3, r9
mr r4, r10
mr r5, r11
#endif /* defined(CONFIG_4xx_DCACHE) || defined(CONFIG_SYS_INIT_DCACHE_CS) */
#ifdef CONFIG_SYS_INIT_RAM_DCACHE
/*
* Unlock the previously locked d-cache
*/
msync
isync
/* set TFLOOR/NFLOOR to 0 again */
lis r6,0x0001
ori r6,r6,0xf800
mtspr SPRN_DVLIM,r6
lis r6,0x0000
ori r6,r6,0x0000
mtspr SPRN_DNV0,r6
mtspr SPRN_DNV1,r6
mtspr SPRN_DNV2,r6
mtspr SPRN_DNV3,r6
mtspr SPRN_DTV0,r6
mtspr SPRN_DTV1,r6
mtspr SPRN_DTV2,r6
mtspr SPRN_DTV3,r6
msync
isync
/* Invalidate data cache, now no longer our stack */
dccci 0,0
sync
isync
#endif /* CONFIG_SYS_INIT_RAM_DCACHE */
/*
* 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.
*/
#if defined(CONFIG_440)
/* Clear all potential pending exceptions */
mfspr r1,SPRN_MCSR
mtspr SPRN_MCSR,r1
addi r1,r0,CONFIG_SYS_TLB_FOR_BOOT_FLASH /* Use defined TLB */
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 /* defined(CONFIG_440) */
mr r1, r3 /* Set new stack pointer */
mr r9, r4 /* Save copy of Init Data pointer */
mr r10, r5 /* Save copy of Destination Address */
GET_GOT
mr r3, r5 /* Destination Address */
lis r4, CONFIG_SYS_MONITOR_BASE@h /* Source Address */
ori r4, r4, CONFIG_SYS_MONITOR_BASE@l
lwz r5, GOT(__init_end)
sub r5, r5, r4
li r6, L1_CACHE_BYTES /* Cache Line Size */
/*
* Fix GOT pointer:
*
* New GOT-PTR = (old GOT-PTR - CONFIG_SYS_MONITOR_BASE) + Destination Address
*
* Offset:
*/
sub r15, r10, r4
/* First our own GOT */
add r12, r12, r15
/* then 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 + _START_OFFSET
mtlr r0
blr /* NEVER RETURNS! */
in_ram:
/*
* Relocation Function, r12 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)
cmpwi r0,0
beq- 2f
add r0,r0,r11
stw r0,0(r3)
2: bdnz 1b
/*
* Now adjust the fixups and the pointers to the fixups
* in case we need to move ourselves again.
*/
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
cmpwi r0,0
add r0,r0,r11
stw r4,0(r3)
beq- 5f
stw r0,0(r4)
5: bdnz 3b
4:
clear_bss:
/*
* Now clear BSS segment
*/
lwz r3,GOT(__bss_start)
lwz r4,GOT(__bss_end)
cmplw 0, r3, r4
beq 7f
li r0, 0
andi. r5, r4, 3
beq 6f
sub r4, r4, r5
mtctr r5
mr r5, r4
5: stb r0, 0(r5)
addi r5, r5, 1
bdnz 5b
6:
stw r0, 0(r3)
addi r3, r3, 4
cmplw 0, r3, r4
bne 6b
7:
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:
mflr r4 /* save link register */
GET_GOT
lwz r7, GOT(_start_of_vectors)
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 */
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 + _START_OFFSET
li r8, Alignment - _start + _START_OFFSET
2:
bl trap_reloc
addi r7, r7, 0x100 /* next exception vector */
cmplw 0, r7, r8
blt 2b
li r7, .L_Alignment - _start + _START_OFFSET
bl trap_reloc
li r7, .L_ProgramCheck - _start + _START_OFFSET
bl trap_reloc
#ifdef CONFIG_440
li r7, .L_FPUnavailable - _start + _START_OFFSET
bl trap_reloc
li r7, .L_Decrementer - _start + _START_OFFSET
bl trap_reloc
li r7, .L_APU - _start + _START_OFFSET
bl trap_reloc
li r7, .L_InstructionTLBError - _start + _START_OFFSET
bl trap_reloc
li r7, .L_DataTLBError - _start + _START_OFFSET
bl trap_reloc
#else /* CONFIG_440 */
li r7, .L_PIT - _start + _START_OFFSET
bl trap_reloc
li r7, .L_InstructionTLBMiss - _start + _START_OFFSET
bl trap_reloc
li r7, .L_DataTLBMiss - _start + _START_OFFSET
bl trap_reloc
#endif /* CONFIG_440 */
li r7, .L_DebugBreakpoint - _start + _START_OFFSET
bl trap_reloc
#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 SPRN_SRR1,r7
mflr r7
mtspr SPRN_SRR0,r7
rfi
__440_msr_continue:
#endif
mtlr r4 /* restore link register */
blr
#endif /* CONFIG_SPL_BUILD */
#if defined(CONFIG_440)
/*----------------------------------------------------------------------------+
| dcbz_area.
+----------------------------------------------------------------------------*/
function_prolog(dcbz_area)
rlwinm. r5,r4,0,27,31
rlwinm r5,r4,27,5,31
beq ..d_ra2
addi r5,r5,0x0001
..d_ra2:mtctr r5
..d_ag2:dcbz r0,r3
addi r3,r3,32
bdnz ..d_ag2
sync
blr
function_epilog(dcbz_area)
#endif /* CONFIG_440 */
#endif /* CONFIG_SPL_BUILD */
/*------------------------------------------------------------------------------- */
/* 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: out32 */
/* Description: Output 32 bits */
/*------------------------------------------------------------------------------- */
.globl out32
out32:
stw r4,0x0000(r3)
blr
/*------------------------------------------------------------------------------- */
/* Function: in32 */
/* Description: Input 32 bits */
/*------------------------------------------------------------------------------- */
.globl in32
in32:
lwz 3,0x0000(3)
blr
/**************************************************************************/
/* 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,CONFIG_SYS_GPIO0_OSRH@h
ori r4,r4,CONFIG_SYS_GPIO0_OSRH@l
stw r4,0(r3)
lis r3,GPIO0_OSRL@h
ori r3,r3,GPIO0_OSRL@l
lis r4,CONFIG_SYS_GPIO0_OSRL@h
ori r4,r4,CONFIG_SYS_GPIO0_OSRL@l
stw r4,0(r3)
lis r3,GPIO0_ISR1H@h /* config GPIO input select */
ori r3,r3,GPIO0_ISR1H@l
lis r4,CONFIG_SYS_GPIO0_ISR1H@h
ori r4,r4,CONFIG_SYS_GPIO0_ISR1H@l
stw r4,0(r3)
lis r3,GPIO0_ISR1L@h
ori r3,r3,GPIO0_ISR1L@l
lis r4,CONFIG_SYS_GPIO0_ISR1L@h
ori r4,r4,CONFIG_SYS_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,CONFIG_SYS_GPIO0_TSRH@h
ori r4,r4,CONFIG_SYS_GPIO0_TSRH@l
stw r4,0(r3)
lis r3,GPIO0_TSRL@h
ori r3,r3,GPIO0_TSRL@l
lis r4,CONFIG_SYS_GPIO0_TSRL@h
ori r4,r4,CONFIG_SYS_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,CONFIG_SYS_GPIO0_TCR@h
ori r4,r4,CONFIG_SYS_GPIO0_TCR@l
stw r4,0(r3)
li r3,PB1AP /* program EBC bank 1 for RTC access */
mtdcr EBC0_CFGADDR,r3
lis r3,CONFIG_SYS_EBC_PB1AP@h
ori r3,r3,CONFIG_SYS_EBC_PB1AP@l
mtdcr EBC0_CFGDATA,r3
li r3,PB1CR
mtdcr EBC0_CFGADDR,r3
lis r3,CONFIG_SYS_EBC_PB1CR@h
ori r3,r3,CONFIG_SYS_EBC_PB1CR@l
mtdcr EBC0_CFGDATA,r3
li r3,PB1AP /* program EBC bank 1 for RTC access */
mtdcr EBC0_CFGADDR,r3
lis r3,CONFIG_SYS_EBC_PB1AP@h
ori r3,r3,CONFIG_SYS_EBC_PB1AP@l
mtdcr EBC0_CFGDATA,r3
li r3,PB1CR
mtdcr EBC0_CFGADDR,r3
lis r3,CONFIG_SYS_EBC_PB1CR@h
ori r3,r3,CONFIG_SYS_EBC_PB1CR@l
mtdcr EBC0_CFGDATA,r3
li r3,PB4AP /* program EBC bank 4 for FPGA access */
mtdcr EBC0_CFGADDR,r3
lis r3,CONFIG_SYS_EBC_PB4AP@h
ori r3,r3,CONFIG_SYS_EBC_PB4AP@l
mtdcr EBC0_CFGDATA,r3
li r3,PB4CR
mtdcr EBC0_CFGADDR,r3
lis r3,CONFIG_SYS_EBC_PB4CR@h
ori r3,r3,CONFIG_SYS_EBC_PB4CR@l
mtdcr EBC0_CFGDATA,r3
#endif
/*
!-----------------------------------------------------------------------
! 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 */
#ifdef CONFIG_TAIHU
mfdcr r4, CPC0_BOOT
andi. r5, r4, CPC0_BOOT_SEP@l
bne strap_1 /* serial eeprom present */
addis r5,0,CPLD_REG0_ADDR@h
ori r5,r5,CPLD_REG0_ADDR@l
andi. r5, r5, 0x10
bne _pci_66mhz
#endif /* CONFIG_TAIHU */
#if defined(CONFIG_ZEUS)
mfdcr r4, CPC0_BOOT
andi. r5, r4, CPC0_BOOT_SEP@l
bne strap_1 /* serial eeprom present */
lis r3,0x0000
addi r3,r3,0x3030
lis r4,0x8042
addi r4,r4,0x223e
b 1f
strap_1:
mfdcr r3, CPC0_PLLMR0
mfdcr r4, CPC0_PLLMR1
b 1f
#endif
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 /* */
#ifdef CONFIG_TAIHU
b 1f
_pci_66mhz:
addis r3,0,PLLMR0_DEFAULT_PCI66@h
ori r3,r3,PLLMR0_DEFAULT_PCI66@l
addis r4,0,PLLMR1_DEFAULT_PCI66@h
ori r4,r4,PLLMR1_DEFAULT_PCI66@l
b 1f
strap_1:
mfdcr r3, CPC0_PLLMR0
mfdcr r4, CPC0_PLLMR1
#endif /* CONFIG_TAIHU */
1:
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
!-----------------------------------------------------------------------------
*/
.globl pll_write
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 SPRN_DBCR0,r3 /* This will cause a CPU core reset, and */
/* execution will continue from the poweron */
/* vector of 0xfffffffc */
#endif /* CONFIG_405EP */
#if defined(CONFIG_440)
/*----------------------------------------------------------------------------+
| mttlb3.
+----------------------------------------------------------------------------*/
function_prolog(mttlb3)
TLBWE(4,3,2)
blr
function_epilog(mttlb3)
/*----------------------------------------------------------------------------+
| mftlb3.
+----------------------------------------------------------------------------*/
function_prolog(mftlb3)
TLBRE(3,3,2)
blr
function_epilog(mftlb3)
/*----------------------------------------------------------------------------+
| mttlb2.
+----------------------------------------------------------------------------*/
function_prolog(mttlb2)
TLBWE(4,3,1)
blr
function_epilog(mttlb2)
/*----------------------------------------------------------------------------+
| mftlb2.
+----------------------------------------------------------------------------*/
function_prolog(mftlb2)
TLBRE(3,3,1)
blr
function_epilog(mftlb2)
/*----------------------------------------------------------------------------+
| mttlb1.
+----------------------------------------------------------------------------*/
function_prolog(mttlb1)
TLBWE(4,3,0)
blr
function_epilog(mttlb1)
/*----------------------------------------------------------------------------+
| mftlb1.
+----------------------------------------------------------------------------*/
function_prolog(mftlb1)
TLBRE(3,3,0)
blr
function_epilog(mftlb1)
#endif /* CONFIG_440 */
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