* Copyright (C) 1999 Magnus Damm <kieraypc01.p.y.kie.era.ericsson.se>
* Copyright (C) 2000, 2001, 2002 Wolfgang Denk <wd@denx.de>
* Copyright (C) 2003 Martin Winistoerfer, martinwinistoerfer@gmx.ch.
- *
+ *
* See file CREDITS for list of people who contributed to this
* project.
*
/*
* File: start.S
- *
+ *
* Discription: startup code
*
*/
#include <config.h>
#include <mpc5xx.h>
+#include <timestamp.h>
#include <version.h>
#define CONFIG_5xx 1 /* needed for Linux kernel header files */
#include <ppc_asm.tmpl>
#include <ppc_defs.h>
-
+
#include <linux/config.h>
-#include <asm/processor.h>
+#include <asm/processor.h>
#ifndef CONFIG_IDENT_STRING
#define CONFIG_IDENT_STRING ""
/*
* Set up GOT: Global Offset Table
*
- * Use r14 to access the GOT
+ * Use r12 to access the GOT
*/
START_GOT
GOT_ENTRY(_GOT2_TABLE_)
.globl version_string
version_string:
.ascii U_BOOT_VERSION
- .ascii " (", __DATE__, " - ", __TIME__, ")"
+ .ascii " (", U_BOOT_DATE, " - ", U_BOOT_TIME, ")"
.ascii CONFIG_IDENT_STRING, "\0"
. = EXC_OFF_SYS_RESET
.globl _start
_start:
mfspr r3, 638
- li r4, CFG_ISB /* Set ISB bit */
- or r3, r3, r4
+ li r4, CONFIG_SYS_ISB /* Set ISB bit */
+ or r3, r3, r4
mtspr 638, r3
li r21, BOOTFLAG_COLD /* Normal Power-On: Boot from FLASH */
b boot_cold
mtspr COUNTA, r0
mtspr COUNTB, r0
+#if defined(CONFIG_PATI)
+ /* the external flash access on PATI fails if programming the PLL to 40MHz.
+ * Copy the PLL programming code to the internal RAM and execute it
+ *----------------------------------------------------------------------*/
+ lis r3, CONFIG_SYS_MONITOR_BASE@h
+ ori r3, r3, CONFIG_SYS_MONITOR_BASE@l
+ addi r3, r3, pll_prog_code_start - _start + EXC_OFF_SYS_RESET
+
+ lis r4, CONFIG_SYS_INIT_RAM_ADDR@h
+ ori r4, r4, CONFIG_SYS_INIT_RAM_ADDR@l
+ mtlr r4
+ addis r5,0,0x0
+ ori r5,r5,((pll_prog_code_end - pll_prog_code_start) >>2)
+ mtctr r5
+ addi r3, r3, -4
+ addi r4, r4, -4
+0:
+ lwzu r0,4(r3)
+ stwu r0,4(r4)
+ bdnz 0b /* copy loop */
+ blrl
+#endif
+
/*
* Calculate absolute address in FLASH and jump there
*----------------------------------------------------------------------*/
- lis r3, CFG_MONITOR_BASE@h
- ori r3, r3, CFG_MONITOR_BASE@l
+ 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
/* Initialize some SPRs that are hard to access from C */
/*----------------------------------------------------------------------*/
-
- lis r3, CFG_IMMR@h /* Pass IMMR as arg1 to C routine */
- lis r2, CFG_INIT_SP_ADDR@h
- ori r1, r2, CFG_INIT_SP_ADDR@l /* Set up the stack in internal SRAM */
+
+ lis r3, CONFIG_SYS_IMMR@h /* Pass IMMR as arg1 to C routine */
+ lis r2, CONFIG_SYS_INIT_SP_ADDR@h
+ ori r1, r2, CONFIG_SYS_INIT_SP_ADDR@l /* Set up the stack in internal SRAM */
/* Note: R0 is still 0 here */
stwu r0, -4(r1) /* Clear final stack frame so that */
stwu r0, -4(r1) /* stack backtraces terminate cleanly */
/* Set up debug mode entry */
- lis r2, CFG_DER@h
- ori r2, r2, CFG_DER@l
+ lis r2, CONFIG_SYS_DER@h
+ ori r2, r2, CONFIG_SYS_DER@l
mtspr DER, r2
/* Let the C-code set up the rest */
bl board_init_f /* run 1st part of board init code (from Flash) */
-
.globl _start_of_vectors
_start_of_vectors:
/* Alignment exception. */
. = 0x600
Alignment:
- EXCEPTION_PROLOG
+ EXCEPTION_PROLOG(SRR0, SRR1)
mfspr r4,DAR
stw r4,_DAR(r21)
mfspr r5,DSISR
stw r5,_DSISR(r21)
addi r3,r1,STACK_FRAME_OVERHEAD
- li r20,MSR_KERNEL
- rlwimi r20,r23,0,16,16 /* copy EE bit from saved MSR */
- lwz r6,GOT(transfer_to_handler)
- mtlr r6
- blrl
-.L_Alignment:
- .long AlignmentException - _start + EXC_OFF_SYS_RESET
- .long int_return - _start + EXC_OFF_SYS_RESET
+ EXC_XFER_TEMPLATE(Alignment, AlignmentException, MSR_KERNEL, COPY_EE)
/* Program check exception */
. = 0x700
ProgramCheck:
- EXCEPTION_PROLOG
+ EXCEPTION_PROLOG(SRR0, SRR1)
addi r3,r1,STACK_FRAME_OVERHEAD
- li r20,MSR_KERNEL
- rlwimi r20,r23,0,16,16 /* copy EE bit from saved MSR */
- lwz r6,GOT(transfer_to_handler)
- mtlr r6
- blrl
-.L_ProgramCheck:
- .long ProgramCheckException - _start + EXC_OFF_SYS_RESET
- .long int_return - _start + EXC_OFF_SYS_RESET
+ EXC_XFER_TEMPLATE(ProgramCheck, ProgramCheckException,
+ MSR_KERNEL, COPY_EE)
/* FPU on MPC5xx available. We will use it later.
*/
STD_EXCEPTION(0x900, Decrementer, timer_interrupt)
STD_EXCEPTION(0xa00, Trap_0a, UnknownException)
STD_EXCEPTION(0xb00, Trap_0b, UnknownException)
-
- . = 0xc00
-/*
- * r0 - SYSCALL number
- * r3-... arguments
- */
-SystemCall:
- addis r11,r0,0 /* get functions table addr */
- ori r11,r11,0 /* Note: this code is patched in trap_init */
- addis r12,r0,0 /* get number of functions */
- ori r12,r12,0
-
- cmplw 0, r0, r12
- bge 1f
-
- rlwinm r0,r0,2,0,31 /* fn_addr = fn_tbl[r0] */
- add r11,r11,r0
- lwz r11,0(r11)
-
- li r20,0xd00-4 /* Get stack pointer */
- lwz r12,0(r20)
- subi r12,r12,12 /* Adjust stack pointer */
- li r0,0xc00+_end_back-SystemCall
- cmplw 0, r0, r12 /* Check stack overflow */
- bgt 1f
- stw r12,0(r20)
-
- mflr r0
- stw r0,0(r12)
- mfspr r0,SRR0
- stw r0,4(r12)
- mfspr r0,SRR1
- stw r0,8(r12)
-
- li r12,0xc00+_back-SystemCall
- mtlr r12
- mtspr SRR0,r11
-
-1: SYNC
- rfi
-
-_back:
-
- mfmsr r11 /* Disable interrupts */
- li r12,0
- ori r12,r12,MSR_EE
- andc r11,r11,r12
- SYNC /* Some chip revs need this... */
- mtmsr r11
- SYNC
-
- li r12,0xd00-4 /* restore regs */
- lwz r12,0(r12)
-
- lwz r11,0(r12)
- mtlr r11
- lwz r11,4(r12)
- mtspr SRR0,r11
- lwz r11,8(r12)
- mtspr SRR1,r11
-
- addi r12,r12,12 /* Adjust stack pointer */
- li r20,0xd00-4
- stw r12,0(r20)
-
- SYNC
- rfi
-_end_back:
-
+ STD_EXCEPTION(0xc00, SystemCall, UnknownException)
STD_EXCEPTION(0xd00, SingleStep, UnknownException)
STD_EXCEPTION(0xe00, Trap_0e, UnknownException)
SYNC
rfi
-
+
/*
* unsigned int get_immr (unsigned int mask)
*
mr r9, r4 /* Save copy of global data pointer in SRAM */
mr r10, r5 /* Save copy of monitor destination Address in SRAM */
+ GET_GOT
mr r3, r5 /* Destination Address */
- lis r4, CFG_MONITOR_BASE@h /* Source Address */
- ori r4, r4, CFG_MONITOR_BASE@l
+ 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
/*
* Fix GOT pointer:
*
- * New GOT-PTR = (old GOT-PTR - CFG_MONITOR_BASE) + Destination Address
+ * New GOT-PTR = (old GOT-PTR - CONFIG_SYS_MONITOR_BASE) + Destination Address
*
* Offset:
*/
sub r15, r10, r4
/* First our own GOT */
- add r14, r14, r15
+ add r12, r12, r15
/* the the one used by the C code */
add r30, r30, r15
stwu r0,-4(r7)
bdnz 3b
-4: sync
+4: sync
isync
/*
in_ram:
/*
- * Relocation Function, r14 point to got2+0x8000
+ * 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.
+ * 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_)
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)
- bdnz 1b
+2: bdnz 1b
/*
- * Now adjust the fixups and the pointers to the fixups
+ * Now adjust the fixups and the pointers to the fixups
* in case we need to move ourselves again.
*/
-2: li r0,__fixup_entries@sectoff@l
+ li r0,__fixup_entries@sectoff@l
lwz r3,GOT(_FIXUP_TABLE_)
cmpwi r0,0
mtctr r0
*/
.globl trap_init
trap_init:
+ mflr r4 /* save link register */
+ GET_GOT
lwz r7, GOT(_start)
lwz r8, GOT(_end_of_vectors)
- rlwinm r9, r7, 0, 22, 31 /* _start & 0x3FF */
+ li r9, 0x100 /* reset vector always at 0x100 */
cmplw 0, r7, r8
bgelr /* return if r7>=r8 - just in case */
-
- mflr r4 /* save link register */
1:
lwz r0, 0(r7)
stw r0, 0(r9)
mtlr r4 /* restore link register */
blr
- /*
- * Function: relocate entries for one exception vector
- */
-trap_reloc:
- lwz r0, 0(r7) /* hdlr ... */
- add r0, r0, r3 /* ... += dest_addr */
- stw r0, 0(r7)
-
- lwz r0, 4(r7) /* int_return ... */
- add r0, r0, r3 /* ... += dest_addr */
- stw r0, 4(r7)
-
- sync
- isync
-
+#if defined(CONFIG_PATI)
+/* Program the PLL */
+pll_prog_code_start:
+ lis r4, (CONFIG_SYS_IMMR + 0x002fc384)@h
+ ori r4, r4, (CONFIG_SYS_IMMR + 0x002fc384)@l
+ lis r3, (0x55ccaa33)@h
+ ori r3, r3, (0x55ccaa33)@l
+ stw r3, 0(r4)
+ lis r4, (CONFIG_SYS_IMMR + 0x002fc284)@h
+ ori r4, r4, (CONFIG_SYS_IMMR + 0x002fc284)@l
+ lis r3, CONFIG_SYS_PLPRCR@h
+ ori r3, r3, CONFIG_SYS_PLPRCR@l
+ stw r3, 0(r4)
+ addis r3,0,0x0
+ ori r3,r3,0xA000
+ mtctr r3
+..spinlp:
+ bdnz ..spinlp /* spin loop */
blr
+pll_prog_code_end:
+ nop
+ blr
+#endif
projects / karo-tx-uboot.git / blobdiff