path: root/arch/powerpc/cpu/ppc4xx/start.S

/*
 *  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 */