--- /dev/null
+/*
+ * 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>
+ *
+ * SPDX-License-Identifier: GPL-2.0+
+ */
+
+/*
+ * U-Boot - Startup Code for MPC8260 PowerPC based Embedded Boards
+ */
+#include <asm-offsets.h>
+#include <config.h>
+#include <mpc8260.h>
+#include <version.h>
+
+#include <ppc_asm.tmpl>
+#include <ppc_defs.h>
+
+#include <asm/cache.h>
+#include <asm/mmu.h>
+#include <asm/u-boot.h>
+
+/* We don't want the MMU yet.
+*/
+#undef MSR_KERNEL
+/* Floating Point enable, Machine Check and Recoverable Interr. */
+#ifdef DEBUG
+#define MSR_KERNEL (MSR_FP|MSR_RI)
+#else
+#define MSR_KERNEL (MSR_FP|MSR_ME|MSR_RI)
+#endif
+
+/*
+ * Set up GOT: Global Offset Table
+ *
+ * Use r12 to access the GOT
+ */
+ 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)
+#if defined(CONFIG_HYMOD)
+ GOT_ENTRY(environment)
+#endif
+ END_GOT
+
+/*
+ * Version string - must be in data segment because MPC8260 uses the first
+ * 256 bytes for the Hard Reset Configuration Word table (see below).
+ * Similarly, can't have the U-Boot Magic Number as the first thing in
+ * the image - don't know how this will affect the image tools, but I guess
+ * I'll find out soon
+ */
+ .data
+ .globl version_string
+version_string:
+ .ascii U_BOOT_VERSION_STRING, "\0"
+
+/*
+ * Hard Reset Configuration Word (HRCW) table
+ *
+ * The Hard Reset Configuration Word (HRCW) sets a number of useful things
+ * such as whether there is an external memory controller, whether the
+ * PowerPC core is disabled (i.e. only the communications processor is
+ * active, accessed by another CPU on the bus), whether using external
+ * arbitration, external bus mode, boot port size, core initial prefix,
+ * internal space base, boot memory space, etc.
+ *
+ * These things dictate where the processor begins execution, where the
+ * boot ROM appears in memory, the memory controller setup when access
+ * boot ROM, etc. The HRCW is *extremely* important.
+ *
+ * The HRCW is read from the bus during reset. One CPU on the bus will
+ * be a hard reset configuration master, any others will be hard reset
+ * configuration slaves. The master reads eight HRCWs from flash during
+ * reset - the first it uses for itself, the other 7 it communicates to
+ * up to 7 configuration slaves by some complicated mechanism, which is
+ * not really important here.
+ *
+ * The configuration master performs 32 successive reads starting at address
+ * 0 and incrementing by 8 each read (i.e. on 64 bit boundaries) but only 8
+ * bits is read, and always from byte lane D[0-7] (so that port size of the
+ * boot device does not matter). The first four reads form the 32 bit HRCW
+ * for the master itself. The second four reads form the HRCW for the first
+ * slave, and so on, up to seven slaves. The 32 bit HRCW is formed by
+ * concatenating the four bytes, with the first read placed in byte 0 (the
+ * most significant byte), and so on with the fourth read placed in byte 3
+ * (the least significant byte).
+ */
+#define _HRCW_TABLE_ENTRY(w) \
+ .fill 8,1,(((w)>>24)&0xff); \
+ .fill 8,1,(((w)>>16)&0xff); \
+ .fill 8,1,(((w)>> 8)&0xff); \
+ .fill 8,1,(((w) )&0xff)
+ .text
+ .globl _hrcw_table
+_hrcw_table:
+ _HRCW_TABLE_ENTRY(CONFIG_SYS_HRCW_MASTER)
+ _HRCW_TABLE_ENTRY(CONFIG_SYS_HRCW_SLAVE1)
+ _HRCW_TABLE_ENTRY(CONFIG_SYS_HRCW_SLAVE2)
+ _HRCW_TABLE_ENTRY(CONFIG_SYS_HRCW_SLAVE3)
+ _HRCW_TABLE_ENTRY(CONFIG_SYS_HRCW_SLAVE4)
+ _HRCW_TABLE_ENTRY(CONFIG_SYS_HRCW_SLAVE5)
+ _HRCW_TABLE_ENTRY(CONFIG_SYS_HRCW_SLAVE6)
+ _HRCW_TABLE_ENTRY(CONFIG_SYS_HRCW_SLAVE7)
+/*
+ * After configuration, a system reset exception is executed using the
+ * vector at offset 0x100 relative to the base set by MSR[IP]. If MSR[IP]
+ * is 0, the base address is 0x00000000. If MSR[IP] is 1, the base address
+ * is 0xfff00000. In the case of a Power On Reset or Hard Reset, the value
+ * of MSR[IP] is determined by the CIP field in the HRCW.
+ *
+ * Other bits in the HRCW set up the Base Address and Port Size in BR0.
+ * This determines the location of the boot ROM (flash or EPROM) in the
+ * processor's address space at boot time. As long as the HRCW is set up
+ * so that we eventually end up executing the code below when the processor
+ * executes the reset exception, the actual values used should not matter.
+ *
+ * Once we have got here, the address mask in OR0 is cleared so that the
+ * bottom 32K of the boot ROM is effectively repeated all throughout the
+ * processor's address space, after which we can jump to the absolute
+ * address at which the boot ROM was linked at compile time, and proceed
+ * to initialise the memory controller without worrying if the rug will be
+ * pulled out from under us, so to speak (it will be fine as long as we
+ * configure BR0 with the same boot ROM link address).
+ */
+ . = EXC_OFF_SYS_RESET
+
+ .globl _start
+_start:
+#if defined(CONFIG_MPC8260ADS) && defined(CONFIG_SYS_DEFAULT_IMMR)
+ lis r3, CONFIG_SYS_DEFAULT_IMMR@h
+ nop
+ lwz r4, 0(r3)
+ nop
+ rlwinm r4, r4, 0, 8, 5
+ nop
+ oris r4, r4, 0x0200
+ nop
+ stw r4, 0(r3)
+ nop
+#endif /* CONFIG_MPC8260ADS && CONFIG_SYS_DEFAULT_IMMR */
+
+ mfmsr r5 /* save msr contents */
+
+#if defined(CONFIG_COGENT)
+ /* this is what the cogent EPROM does */
+ li r0, 0
+ mtmsr r0
+ isync
+ bl cogent_init_8260
+#endif /* CONFIG_COGENT */
+
+#if defined(CONFIG_SYS_DEFAULT_IMMR)
+ lis r3, CONFIG_SYS_IMMR@h
+ ori r3, r3, CONFIG_SYS_IMMR@l
+ lis r4, CONFIG_SYS_DEFAULT_IMMR@h
+ stw r3, 0x1A8(r4)
+#endif /* CONFIG_SYS_DEFAULT_IMMR */
+
+ /* Initialise the MPC8260 processor core */
+ /*--------------------------------------------------------------*/
+
+ bl init_8260_core
+
+#ifndef CONFIG_SYS_RAMBOOT
+ /* When booting from ROM (Flash or EPROM), clear the */
+ /* Address Mask in OR0 so ROM appears everywhere */
+ /*--------------------------------------------------------------*/
+
+ lis r3, (CONFIG_SYS_IMMR+IM_REGBASE)@h
+ lwz r4, IM_OR0@l(r3)
+ li r5, 0x7fff
+ and r4, r4, r5
+ stw r4, IM_OR0@l(r3)
+
+ /* Calculate absolute address in FLASH and jump there */
+ /*--------------------------------------------------------------*/
+
+ lis r3, CONFIG_SYS_MONITOR_BASE@h
+ ori r3, r3, CONFIG_SYS_MONITOR_BASE@l
+ addi r3, r3, in_flash - _start + EXC_OFF_SYS_RESET
+ mtlr r3
+ blr
+
+in_flash:
+#endif /* CONFIG_SYS_RAMBOOT */
+
+ /* initialize some things that are hard to access from C */
+ /*--------------------------------------------------------------*/
+
+ lis r3, CONFIG_SYS_IMMR@h /* set up stack in internal DPRAM */
+ ori r1, r3, CONFIG_SYS_INIT_SP_OFFSET
+ 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 */
+
+ /* let the C-code set up the rest */
+ /* */
+ /* Be careful to keep code relocatable ! */
+ /*--------------------------------------------------------------*/
+
+ GET_GOT /* initialize GOT access */
+
+ /* r3: IMMR */
+ bl cpu_init_f /* run low-level CPU init code (in Flash)*/
+
+#ifdef DEBUG
+ bl init_debug /* set up debugging stuff */
+#endif
+
+ bl board_init_f /* run 1st part of board init code (in Flash)*/
+
+ /* NOTREACHED - board_init_f() does not return */
+
+/*
+ * Vector Table
+ */
+
+ .globl _start_of_vectors
+_start_of_vectors:
+
+/* Machine check */
+ STD_EXCEPTION(0x200, MachineCheck, MachineCheckException)
+
+/* Data Storage exception. */
+ STD_EXCEPTION(0x300, DataStorage, UnknownException)
+
+/* Instruction Storage exception. */
+ STD_EXCEPTION(0x400, InstStorage, UnknownException)
+
+/* External Interrupt exception. */
+ STD_EXCEPTION(0x500, ExtInterrupt, external_interrupt)
+
+/* Alignment exception. */
+ . = 0x600
+Alignment:
+ EXCEPTION_PROLOG(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)
+
+ STD_EXCEPTION(0x800, FPUnavailable, UnknownException)
+
+ /* I guess we could implement decrementer, and may have
+ * to someday for timekeeping.
+ */
+ STD_EXCEPTION(0x900, Decrementer, timer_interrupt)
+
+ STD_EXCEPTION(0xa00, Trap_0a, UnknownException)
+ STD_EXCEPTION(0xb00, Trap_0b, UnknownException)
+ STD_EXCEPTION(0xc00, SystemCall, UnknownException)
+ STD_EXCEPTION(0xd00, SingleStep, UnknownException)
+
+ STD_EXCEPTION(0xe00, Trap_0e, UnknownException)
+ STD_EXCEPTION(0xf00, Trap_0f, UnknownException)
+
+ STD_EXCEPTION(0x1000, InstructionTLBMiss, UnknownException)
+ STD_EXCEPTION(0x1100, DataLoadTLBMiss, UnknownException)
+ STD_EXCEPTION(0x1200, DataStoreTLBMiss, UnknownException)
+#ifdef DEBUG
+ . = 0x1300
+ /*
+ * This exception occurs when the program counter matches the
+ * Instruction Address Breakpoint Register (IABR).
+ *
+ * I want the cpu to halt if this occurs so I can hunt around
+ * with the debugger and look at things.
+ *
+ * When DEBUG is defined, both machine check enable (in the MSR)
+ * and checkstop reset enable (in the reset mode register) are
+ * turned off and so a checkstop condition will result in the cpu
+ * halting.
+ *
+ * I force the cpu into a checkstop condition by putting an illegal
+ * instruction here (at least this is the theory).
+ *
+ * well - that didnt work, so just do an infinite loop!
+ */
+1: b 1b
+#else
+ STD_EXCEPTION(0x1300, InstructionBreakpoint, DebugException)
+#endif
+ STD_EXCEPTION(0x1400, SMI, UnknownException)
+
+ STD_EXCEPTION(0x1500, Trap_15, UnknownException)
+ STD_EXCEPTION(0x1600, Trap_16, UnknownException)
+ STD_EXCEPTION(0x1700, Trap_17, UnknownException)
+ STD_EXCEPTION(0x1800, Trap_18, UnknownException)
+ STD_EXCEPTION(0x1900, Trap_19, UnknownException)
+ STD_EXCEPTION(0x1a00, Trap_1a, UnknownException)
+ STD_EXCEPTION(0x1b00, Trap_1b, UnknownException)
+ STD_EXCEPTION(0x1c00, Trap_1c, UnknownException)
+ STD_EXCEPTION(0x1d00, Trap_1d, UnknownException)
+ STD_EXCEPTION(0x1e00, Trap_1e, UnknownException)
+ STD_EXCEPTION(0x1f00, Trap_1f, UnknownException)
+ STD_EXCEPTION(0x2000, Trap_20, UnknownException)
+ STD_EXCEPTION(0x2100, Trap_21, UnknownException)
+ STD_EXCEPTION(0x2200, Trap_22, UnknownException)
+ STD_EXCEPTION(0x2300, Trap_23, UnknownException)
+ STD_EXCEPTION(0x2400, Trap_24, UnknownException)
+ STD_EXCEPTION(0x2500, Trap_25, UnknownException)
+ STD_EXCEPTION(0x2600, Trap_26, UnknownException)
+ STD_EXCEPTION(0x2700, Trap_27, UnknownException)
+ STD_EXCEPTION(0x2800, Trap_28, UnknownException)
+ STD_EXCEPTION(0x2900, Trap_29, UnknownException)
+ STD_EXCEPTION(0x2a00, Trap_2a, UnknownException)
+ STD_EXCEPTION(0x2b00, Trap_2b, UnknownException)
+ STD_EXCEPTION(0x2c00, Trap_2c, UnknownException)
+ STD_EXCEPTION(0x2d00, Trap_2d, UnknownException)
+ STD_EXCEPTION(0x2e00, Trap_2e, UnknownException)
+ STD_EXCEPTION(0x2f00, Trap_2f, UnknownException)
+
+
+ .globl _end_of_vectors
+_end_of_vectors:
+
+ . = 0x3000
+
+/*
+ * 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)
+ 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
+
+#if defined(CONFIG_COGENT)
+
+/*
+ * This code initialises the MPC8260 processor core
+ * (conforms to PowerPC 603e spec)
+ */
+
+ .globl cogent_init_8260
+cogent_init_8260:
+
+ /* Taken from page 14 of CMA282 manual */
+ /*--------------------------------------------------------------*/
+
+ lis r4, (CONFIG_SYS_IMMR+IM_REGBASE)@h
+ lis r3, CONFIG_SYS_IMMR@h
+ stw r3, IM_IMMR@l(r4)
+ lwz r3, IM_IMMR@l(r4)
+ stw r3, 0(r0)
+ lis r3, CONFIG_SYS_SYPCR@h
+ ori r3, r3, CONFIG_SYS_SYPCR@l
+ stw r3, IM_SYPCR@l(r4)
+ lwz r3, IM_SYPCR@l(r4)
+ stw r3, 4(r0)
+ lis r3, CONFIG_SYS_SCCR@h
+ ori r3, r3, CONFIG_SYS_SCCR@l
+ stw r3, IM_SCCR@l(r4)
+ lwz r3, IM_SCCR@l(r4)
+ stw r3, 8(r0)
+
+ /* the rest of this was disassembled from the */
+ /* EPROM code that came with my CMA282 CPU module */
+ /*--------------------------------------------------------------*/
+
+ lis r1, 0x1234
+ ori r1, r1, 0x5678
+ stw r1, 0x20(r0)
+ lwz r1, 0x20(r0)
+ stw r1, 0x24(r0)
+ lwz r1, 0x24(r0)
+ lis r3, 0x0e80
+ ori r3, r3, 0
+ stw r1, 4(r3)
+ lwz r1, 4(r3)
+
+ /* Done! */
+ /*--------------------------------------------------------------*/
+
+ blr
+
+#endif /* CONFIG_COGENT */
+
+/*
+ * This code initialises the MPC8260 processor core
+ * (conforms to PowerPC 603e spec)
+ * Note: expects original MSR contents to be in r5.
+ */
+
+ .globl init_8260_core
+init_8260_core:
+
+ /* Initialize machine status; enable machine check interrupt */
+ /*--------------------------------------------------------------*/
+
+ li r3, MSR_KERNEL /* Set ME and RI flags */
+ rlwimi r3, r5, 0, 25, 25 /* preserve IP bit set by HRCW */
+#ifdef DEBUG
+ rlwimi r3, r5, 0, 21, 22 /* debugger might set SE & BE bits */
+#endif
+ SYNC /* Some chip revs need this... */
+ mtmsr r3
+ SYNC
+ mtspr SRR1, r3 /* Make SRR1 match MSR */
+
+ /* Initialise the SYPCR early, and reset the watchdog (if req) */
+ /*--------------------------------------------------------------*/
+
+ lis r3, (CONFIG_SYS_IMMR+IM_REGBASE)@h
+#if !defined(CONFIG_COGENT)
+ lis r4, CONFIG_SYS_SYPCR@h
+ ori r4, r4, CONFIG_SYS_SYPCR@l
+ stw r4, IM_SYPCR@l(r3)
+#endif /* !CONFIG_COGENT */
+#if defined(CONFIG_WATCHDOG)
+ li r4, 21868 /* = 0x556c */
+ sth r4, IM_SWSR@l(r3)
+ li r4, -21959 /* = 0xaa39 */
+ sth r4, IM_SWSR@l(r3)
+#endif /* CONFIG_WATCHDOG */
+
+ /* Initialize the Hardware Implementation-dependent Registers */
+ /* HID0 also contains cache control */
+ /*--------------------------------------------------------------*/
+
+ lis r3, CONFIG_SYS_HID0_INIT@h
+ ori r3, r3, CONFIG_SYS_HID0_INIT@l
+ SYNC
+ mtspr HID0, r3
+
+ lis r3, CONFIG_SYS_HID0_FINAL@h
+ ori r3, r3, CONFIG_SYS_HID0_FINAL@l
+ SYNC
+ mtspr HID0, r3
+
+ lis r3, CONFIG_SYS_HID2@h
+ ori r3, r3, CONFIG_SYS_HID2@l
+ mtspr HID2, r3
+
+ /* clear all BAT's */
+ /*--------------------------------------------------------------*/
+
+ li r0, 0
+ mtspr DBAT0U, r0
+ mtspr DBAT0L, r0
+ mtspr DBAT1U, r0
+ mtspr DBAT1L, r0
+ mtspr DBAT2U, r0
+ mtspr DBAT2L, r0
+ mtspr DBAT3U, r0
+ mtspr DBAT3L, r0
+ mtspr IBAT0U, r0
+ mtspr IBAT0L, r0
+ mtspr IBAT1U, r0
+ mtspr IBAT1L, r0
+ mtspr IBAT2U, r0
+ mtspr IBAT2L, r0
+ mtspr IBAT3U, r0
+ mtspr IBAT3L, r0
+ SYNC
+
+ /* invalidate all tlb's */
+ /* */
+ /* From the 603e User Manual: "The 603e provides the ability to */
+ /* invalidate a TLB entry. The TLB Invalidate Entry (tlbie) */
+ /* instruction invalidates the TLB entry indexed by the EA, and */
+ /* operates on both the instruction and data TLBs simultaneously*/
+ /* invalidating four TLB entries (both sets in each TLB). The */
+ /* index corresponds to bits 15-19 of the EA. To invalidate all */
+ /* entries within both TLBs, 32 tlbie instructions should be */
+ /* issued, incrementing this field by one each time." */
+ /* */
+ /* "Note that the tlbia instruction is not implemented on the */
+ /* 603e." */
+ /* */
+ /* bits 15-19 correspond to addresses 0x00000000 to 0x0001F000 */
+ /* incrementing by 0x1000 each time. The code below is sort of */
+ /* based on code in "flush_tlbs" from arch/powerpc/kernel/head.S */
+ /* */
+ /*--------------------------------------------------------------*/
+
+ li r3, 32
+ mtctr r3
+ li r3, 0
+1: tlbie r3
+ addi r3, r3, 0x1000
+ bdnz 1b
+ SYNC
+
+ /* Done! */
+ /*--------------------------------------------------------------*/
+
+ blr
+
+#ifdef DEBUG
+
+/*
+ * initialise things related to debugging.
+ *
+ * must be called after the global offset table (GOT) is initialised
+ * (GET_GOT) and after cpu_init_f() has executed.
+ */
+
+ .globl init_debug
+init_debug:
+
+ lis r3, (CONFIG_SYS_IMMR+IM_REGBASE)@h
+
+ /* Quick and dirty hack to enable the RAM and copy the */
+ /* vectors so that we can take exceptions. */
+ /*--------------------------------------------------------------*/
+ /* write Memory Refresh Prescaler */
+ li r4, CONFIG_SYS_MPTPR
+ sth r4, IM_MPTPR@l(r3)
+ /* write 60x Refresh Timer */
+ li r4, CONFIG_SYS_PSRT
+ stb r4, IM_PSRT@l(r3)
+ /* init the 60x SDRAM Mode Register */
+ lis r4, (CONFIG_SYS_PSDMR|PSDMR_OP_NORM)@h
+ ori r4, r4, (CONFIG_SYS_PSDMR|PSDMR_OP_NORM)@l
+ stw r4, IM_PSDMR@l(r3)
+ /* write Precharge All Banks command */
+ lis r4, (CONFIG_SYS_PSDMR|PSDMR_OP_PREA)@h
+ ori r4, r4, (CONFIG_SYS_PSDMR|PSDMR_OP_PREA)@l
+ stw r4, IM_PSDMR@l(r3)
+ stb r0, 0(0)
+ /* write eight CBR Refresh commands */
+ lis r4, (CONFIG_SYS_PSDMR|PSDMR_OP_CBRR)@h
+ ori r4, r4, (CONFIG_SYS_PSDMR|PSDMR_OP_CBRR)@l
+ stw r4, IM_PSDMR@l(r3)
+ stb r0, 0(0)
+ stb r0, 0(0)
+ stb r0, 0(0)
+ stb r0, 0(0)
+ stb r0, 0(0)
+ stb r0, 0(0)
+ stb r0, 0(0)
+ stb r0, 0(0)
+ /* write Mode Register Write command */
+ lis r4, (CONFIG_SYS_PSDMR|PSDMR_OP_MRW)@h
+ ori r4, r4, (CONFIG_SYS_PSDMR|PSDMR_OP_MRW)@l
+ stw r4, IM_PSDMR@l(r3)
+ stb r0, 0(0)
+ /* write Normal Operation command and enable Refresh */
+ lis r4, (CONFIG_SYS_PSDMR|PSDMR_OP_NORM|PSDMR_RFEN)@h
+ ori r4, r4, (CONFIG_SYS_PSDMR|PSDMR_OP_NORM|PSDMR_RFEN)@l
+ stw r4, IM_PSDMR@l(r3)
+ stb r0, 0(0)
+ /* RAM should now be operational */
+
+#define VEC_WRD_CNT ((_end_of_vectors - _start + EXC_OFF_SYS_RESET) / 4)
+ mflr r3
+ GET_GOT
+ mtlr r3
+ lwz r3, GOT(_end_of_vectors)
+ rlwinm r4, r3, 0, 18, 31 /* _end_of_vectors & 0x3FFF */
+ lis r5, VEC_WRD_CNT@h
+ ori r5, r5, VEC_WRD_CNT@l
+ mtctr r5
+1:
+ lwzu r5, -4(r3)
+ stwu r5, -4(r4)
+ bdnz 1b
+
+ /* Load the Instruction Address Breakpoint Register (IABR). */
+ /* */
+ /* The address to load is stored in the first word of dual port */
+ /* ram and should be preserved while the power is on, so you */
+ /* can plug addresses into that location then reset the cpu and */
+ /* this code will load that address into the IABR after the */
+ /* reset. */
+ /* */
+ /* When the program counter matches the contents of the IABR, */
+ /* an exception is generated (before the instruction at that */
+ /* location completes). The vector for this exception is 0x1300 */
+ /*--------------------------------------------------------------*/
+ lis r3, CONFIG_SYS_IMMR@h
+ lwz r3, 0(r3)
+ mtspr IABR, r3
+
+ /* Set the entire dual port RAM (where the initial stack */
+ /* resides) to a known value - makes it easier to see where */
+ /* the stack has been written */
+ /*--------------------------------------------------------------*/
+ lis r3, (CONFIG_SYS_IMMR + CONFIG_SYS_INIT_SP_OFFSET)@h
+ ori r3, r3, (CONFIG_SYS_IMMR + CONFIG_SYS_INIT_SP_OFFSET)@l
+ li r4, ((CONFIG_SYS_INIT_SP_OFFSET - 4) / 4)
+ mtctr r4
+ lis r4, 0xdeadbeaf@h
+ ori r4, r4, 0xdeadbeaf@l
+1:
+ stwu r4, -4(r3)
+ bdnz 1b
+
+ /* Done! */
+ /*--------------------------------------------------------------*/
+
+ blr
+#endif
+
+/* Cache functions.
+ *
+ * Note: requires that all cache bits in
+ * HID0 are in the low half word.
+ */
+ .globl icache_enable
+icache_enable:
+ mfspr r3, HID0
+ ori r3, r3, HID0_ICE
+ lis r4, 0
+ ori r4, r4, HID0_ILOCK
+ andc r3, r3, r4
+ ori r4, r3, HID0_ICFI
+ isync
+ mtspr HID0, r4 /* sets enable and invalidate, clears lock */
+ isync
+ mtspr HID0, r3 /* clears invalidate */
+ blr
+
+ .globl icache_disable
+icache_disable:
+ mfspr r3, HID0
+ lis r4, 0
+ ori r4, r4, HID0_ICE|HID0_ILOCK
+ andc r3, r3, r4
+ ori r4, r3, HID0_ICFI
+ isync
+ mtspr HID0, r4 /* sets invalidate, clears enable and lock */
+ isync
+ mtspr HID0, r3 /* clears invalidate */
+ blr
+
+ .globl icache_status
+icache_status:
+ mfspr r3, HID0
+ rlwinm r3, r3, HID0_ICE_BITPOS + 1, 31, 31
+ blr
+
+ .globl dcache_enable
+dcache_enable:
+ mfspr r3, HID0
+ ori r3, r3, HID0_DCE
+ lis r4, 0
+ ori r4, r4, HID0_DLOCK
+ andc r3, r3, r4
+ ori r4, r3, HID0_DCI
+ sync
+ mtspr HID0, r4 /* sets enable and invalidate, clears lock */
+ sync
+ mtspr HID0, r3 /* clears invalidate */
+ blr
+
+ .globl dcache_disable
+dcache_disable:
+ mfspr r3, HID0
+ lis r4, 0
+ ori r4, r4, HID0_DCE|HID0_DLOCK
+ andc r3, r3, r4
+ ori r4, r3, HID0_DCI
+ sync
+ mtspr HID0, r4 /* sets invalidate, clears enable and lock */
+ sync
+ mtspr HID0, r3 /* clears invalidate */
+ blr
+
+ .globl dcache_status
+dcache_status:
+ mfspr r3, HID0
+ rlwinm r3, r3, HID0_DCE_BITPOS + 1, 31, 31
+ blr
+
+ .globl get_pvr
+get_pvr:
+ mfspr r3, PVR
+ blr
+
+/*------------------------------------------------------------------------------*/
+
+/*
+ * void relocate_code (addr_sp, gd, addr_moni)
+ *
+ * This "function" does not return, instead it continues in RAM
+ * after relocating the monitor code.
+ *
+ * r3 = dest
+ * r4 = src
+ * r5 = length in bytes
+ * r6 = cachelinesize
+ */
+ .globl relocate_code
+relocate_code:
+ mr r1, r3 /* Set new stack pointer */
+ mr r9, r4 /* Save copy of Global 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, CONFIG_SYS_CACHELINE_SIZE /* 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
+ mfspr r7,HID0 /* don't do dcbst if dcache is disabled */
+ rlwinm r7,r7,HID0_DCE_BITPOS+1,31,31
+ cmpwi r7,0
+ beq 9f
+ 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 */
+9: mfspr r7,HID0 /* don't do icbi if icache is disabled */
+ rlwinm r7,r7,HID0_ICE_BITPOS+1,31,31
+ cmpwi r7,0
+ beq 7f
+ mr r4,r3
+6: icbi 0,r4
+ add r4,r4,r6
+ cmplw r4,r5
+ blt 6b
+7: sync /* Wait for all icbi to complete on bus */
+ isync
+
+/*
+ * We are done. Do not return, instead branch to second part of board
+ * initialization, now running from RAM.
+ */
+
+ addi r0, r10, in_ram - _start + EXC_OFF_SYS_RESET
+ mtlr r0
+ blr
+
+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)
+#if defined(CONFIG_HYMOD)
+ /*
+ * For HYMOD - the environment is the very last item in flash.
+ * The real .bss stops just before environment starts, so only
+ * clear up to that point.
+ *
+ * taken from mods for FADS board
+ */
+ lwz r4,GOT(environment)
+#else
+ lwz r4,GOT(__bss_end)
+#endif
+
+ cmplw 0, r3, r4
+ beq 6f
+
+ li r0, 0
+5:
+ stw r0, 0(r3)
+ addi r3, r3, 4
+ cmplw 0, r3, r4
+ bne 5b
+6:
+
+ mr r3, r9 /* Global 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)
+ 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 + EXC_OFF_SYS_RESET
+ li r8, Alignment - _start + EXC_OFF_SYS_RESET
+2:
+ bl trap_reloc
+ addi r7, r7, 0x100 /* next exception vector */
+ cmplw 0, r7, r8
+ blt 2b
+
+ li r7, .L_Alignment - _start + EXC_OFF_SYS_RESET
+ bl trap_reloc
+
+ li r7, .L_ProgramCheck - _start + EXC_OFF_SYS_RESET
+ bl trap_reloc
+
+ li r7, .L_FPUnavailable - _start + EXC_OFF_SYS_RESET
+ li r8, SystemCall - _start + EXC_OFF_SYS_RESET
+3:
+ bl trap_reloc
+ addi r7, r7, 0x100 /* next exception vector */
+ cmplw 0, r7, r8
+ blt 3b
+
+ li r7, .L_SingleStep - _start + EXC_OFF_SYS_RESET
+ li r8, _end_of_vectors - _start + EXC_OFF_SYS_RESET
+4:
+ bl trap_reloc
+ addi r7, r7, 0x100 /* next exception vector */
+ cmplw 0, r7, r8
+ blt 4b
+
+ mfmsr r3 /* now that the vectors have */
+ lis r7, MSR_IP@h /* relocated into low memory */
+ ori r7, r7, MSR_IP@l /* MSR[IP] can be turned off */
+ andc r3, r3, r7 /* (if it was on) */
+ SYNC /* Some chip revs need this... */
+ mtmsr r3
+ SYNC
+
+ mtlr r4 /* restore link register */
+ blr
Code Review / kvmfornfv.git / blobdiff