2 * Copyright 2004, 2007 Freescale Semiconductor.
3 * Copyright (C) 2003 Motorola,Inc.
5 * See file CREDITS for list of people who contributed to this
8 * This program is free software; you can redistribute it and/or
9 * modify it under the terms of the GNU General Public License as
10 * published by the Free Software Foundation; either version 2 of
11 * the License, or (at your option) any later version.
13 * This program is distributed in the hope that it will be useful,
14 * but WITHOUT ANY WARRANTY; without even the implied warranty of
15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
16 * GNU General Public License for more details.
18 * You should have received a copy of the GNU General Public License
19 * along with this program; if not, write to the Free Software
20 * Foundation, Inc., 59 Temple Place, Suite 330, Boston,
24 /* U-Boot Startup Code for Motorola 85xx PowerPC based Embedded Boards
26 * The processor starts at 0xfffffffc and the code is first executed in the
27 * last 4K page(0xfffff000-0xffffffff) in flash/rom.
35 #define _LINUX_CONFIG_H 1 /* avoid reading Linux autoconf.h file */
37 #include <ppc_asm.tmpl>
40 #include <asm/cache.h>
43 #ifndef CONFIG_IDENT_STRING
44 #define CONFIG_IDENT_STRING ""
48 #define MSR_KERNEL ( MSR_ME ) /* Machine Check */
51 * Set up GOT: Global Offset Table
53 * Use r14 to access the GOT
56 GOT_ENTRY(_GOT2_TABLE_)
57 GOT_ENTRY(_FIXUP_TABLE_)
60 GOT_ENTRY(_start_of_vectors)
61 GOT_ENTRY(_end_of_vectors)
62 GOT_ENTRY(transfer_to_handler)
66 GOT_ENTRY(__bss_start)
70 * e500 Startup -- after reset only the last 4KB of the effective
71 * address space is mapped in the MMU L2 TLB1 Entry0. The .bootpg
72 * section is located at THIS LAST page and basically does three
73 * things: clear some registers, set up exception tables and
74 * add more TLB entries for 'larger spaces'(e.g. the boot rom) to
75 * continue the boot procedure.
77 * Once the boot rom is mapped by TLB entries we can proceed
78 * with normal startup.
87 /* clear registers/arrays not reset by hardware */
91 mtspr L1CSR0,r0 /* invalidate d-cache */
92 mtspr L1CSR1,r0 /* invalidate i-cache */
95 mtspr DBSR,r1 /* Clear all valid bits */
98 * Enable L1 Caches early
102 lis r2,L1CSR0_CPE@H /* enable parity */
104 mtspr L1CSR0,r2 /* enable L1 Dcache */
106 mtspr L1CSR1,r2 /* enable L1 Icache */
110 /* Setup interrupt vectors */
115 mtspr IVOR0,r1 /* 0: Critical input */
117 mtspr IVOR1,r1 /* 1: Machine check */
119 mtspr IVOR2,r1 /* 2: Data storage */
121 mtspr IVOR3,r1 /* 3: Instruction storage */
123 mtspr IVOR4,r1 /* 4: External interrupt */
125 mtspr IVOR5,r1 /* 5: Alignment */
127 mtspr IVOR6,r1 /* 6: Program check */
129 mtspr IVOR7,r1 /* 7: floating point unavailable */
131 mtspr IVOR8,r1 /* 8: System call */
132 /* 9: Auxiliary processor unavailable(unsupported) */
134 mtspr IVOR10,r1 /* 10: Decrementer */
136 mtspr IVOR11,r1 /* 11: Interval timer */
138 mtspr IVOR12,r1 /* 12: Watchdog timer */
140 mtspr IVOR13,r1 /* 13: Data TLB error */
142 mtspr IVOR14,r1 /* 14: Instruction TLB error */
144 mtspr IVOR15,r1 /* 15: Debug */
146 /* Clear and set up some registers. */
149 mtspr DEC,r0 /* prevent dec exceptions */
150 mttbl r0 /* prevent fit & wdt exceptions */
152 mtspr TSR,r1 /* clear all timer exception status */
153 mtspr TCR,r0 /* disable all */
154 mtspr ESR,r0 /* clear exception syndrome register */
155 mtspr MCSR,r0 /* machine check syndrome register */
156 mtxer r0 /* clear integer exception register */
158 /* Enable Time Base and Select Time Base Clock */
159 lis r0,HID0_EMCP@h /* Enable machine check */
160 #if defined(CONFIG_ENABLE_36BIT_PHYS)
161 ori r0,r0,HID0_ENMAS7@l /* Enable MAS7 */
163 ori r0,r0,HID0_TBEN@l /* Enable Timebase */
166 li r0,(HID1_ASTME|HID1_ABE)@l /* Addr streaming & broadcast */
169 /* Enable Branch Prediction */
170 #if defined(CONFIG_BTB)
171 li r0,0x201 /* BBFI = 1, BPEN = 1 */
175 #if defined(CFG_INIT_DBCR)
178 mtspr DBSR,r1 /* Clear all status bits */
179 lis r0,CFG_INIT_DBCR@h /* DBCR0[IDM] must be set */
180 ori r0,r0,CFG_INIT_DBCR@l
184 /* create a temp mapping in AS=1 to the boot window */
185 lis r6,FSL_BOOKE_MAS0(1, 15, 0)@h
186 ori r6,r6,FSL_BOOKE_MAS0(1, 15, 0)@l
188 lis r7,FSL_BOOKE_MAS1(1, 1, 0, 1, BOOKE_PAGESZ_16M)@h
189 ori r7,r7,FSL_BOOKE_MAS1(1, 1, 0, 1, BOOKE_PAGESZ_16M)@l
191 /* Align the mapping to 16MB */
192 lis r8,FSL_BOOKE_MAS2(TEXT_BASE & 0xff000000, (MAS2_I|MAS2_G))@h
193 ori r8,r8,FSL_BOOKE_MAS2(TEXT_BASE & 0xff000000, (MAS2_I|MAS2_G))@l
195 lis r9,FSL_BOOKE_MAS3(0xff000000, 0, (MAS3_SX|MAS3_SW|MAS3_SR))@h
196 ori r9,r9,FSL_BOOKE_MAS3(0xff000000, 0, (MAS3_SX|MAS3_SW|MAS3_SR))@l
206 /* create a temp mapping in AS=1 to the stack */
207 lis r6,FSL_BOOKE_MAS0(1, 14, 0)@h
208 ori r6,r6,FSL_BOOKE_MAS0(1, 14, 0)@l
210 lis r7,FSL_BOOKE_MAS1(1, 1, 0, 1, BOOKE_PAGESZ_16K)@h
211 ori r7,r7,FSL_BOOKE_MAS1(1, 1, 0, 1, BOOKE_PAGESZ_16K)@l
213 lis r8,FSL_BOOKE_MAS2(CFG_INIT_RAM_ADDR, 0)@h
214 ori r8,r8,FSL_BOOKE_MAS2(CFG_INIT_RAM_ADDR, 0)@l
216 lis r9,FSL_BOOKE_MAS3(CFG_INIT_RAM_ADDR, 0, (MAS3_SX|MAS3_SW|MAS3_SR))@h
217 ori r9,r9,FSL_BOOKE_MAS3(CFG_INIT_RAM_ADDR, 0, (MAS3_SX|MAS3_SW|MAS3_SR))@l
227 lis r6,MSR_CE|MSR_ME|MSR_DE|MSR_IS|MSR_DS@h
228 ori r6,r6,MSR_CE|MSR_ME|MSR_DE|MSR_IS|MSR_DS@l
230 ori r7,r7,switch_as@l
237 /* L1 DCache is used for initial RAM */
239 /* Allocate Initial RAM in data cache.
241 lis r3,CFG_INIT_RAM_ADDR@h
242 ori r3,r3,CFG_INIT_RAM_ADDR@l
245 /* cache size * 1024 / (2 * L1 line size) */
246 slwi r2, r2, (10 - 1 - L1_CACHE_SHIFT)
252 addi r3,r3,CFG_CACHELINE_SIZE
255 /* Jump out the last 4K page and continue to 'normal' start */
259 /* Calculate absolute address in FLASH and jump there */
260 /*--------------------------------------------------------------*/
261 lis r3,CFG_MONITOR_BASE@h
262 ori r3,r3,CFG_MONITOR_BASE@l
263 addi r3,r3,_start_cont - _start + _START_OFFSET
271 .long 0x27051956 /* U-BOOT Magic Number */
272 .globl version_string
274 .ascii U_BOOT_VERSION
275 .ascii " (", __DATE__, " - ", __TIME__, ")"
276 .ascii CONFIG_IDENT_STRING, "\0"
281 /* Setup the stack in initial RAM,could be L2-as-SRAM or L1 dcache*/
282 lis r1,CFG_INIT_RAM_ADDR@h
283 ori r1,r1,CFG_INIT_SP_OFFSET@l
287 stwu r0,-4(r1) /* Terminate call chain */
289 stwu r1,-8(r1) /* Save back chain and move SP */
290 lis r0,RESET_VECTOR@h /* Address of reset vector */
291 ori r0,r0,RESET_VECTOR@l
292 stwu r1,-8(r1) /* Save back chain and move SP */
293 stw r0,+12(r1) /* Save return addr (underflow vect) */
298 /* switch back to AS = 0 */
299 lis r3,(MSR_CE|MSR_ME|MSR_DE)@h
300 ori r3,r3,(MSR_CE|MSR_ME|MSR_DE)@l
308 . = EXC_OFF_SYS_RESET
309 .globl _start_of_vectors
312 /* Critical input. */
313 CRIT_EXCEPTION(0x0100, CriticalInput, CritcalInputException)
316 MCK_EXCEPTION(0x200, MachineCheck, MachineCheckException)
318 /* Data Storage exception. */
319 STD_EXCEPTION(0x0300, DataStorage, UnknownException)
321 /* Instruction Storage exception. */
322 STD_EXCEPTION(0x0400, InstStorage, UnknownException)
324 /* External Interrupt exception. */
325 STD_EXCEPTION(0x0500, ExtInterrupt, ExtIntException)
327 /* Alignment exception. */
330 EXCEPTION_PROLOG(SRR0, SRR1)
335 addi r3,r1,STACK_FRAME_OVERHEAD
337 rlwimi r20,r23,0,16,16 /* copy EE bit from saved MSR */
338 lwz r6,GOT(transfer_to_handler)
342 .long AlignmentException - _start + _START_OFFSET
343 .long int_return - _start + _START_OFFSET
345 /* Program check exception */
348 EXCEPTION_PROLOG(SRR0, SRR1)
349 addi r3,r1,STACK_FRAME_OVERHEAD
351 rlwimi r20,r23,0,16,16 /* copy EE bit from saved MSR */
352 lwz r6,GOT(transfer_to_handler)
356 .long ProgramCheckException - _start + _START_OFFSET
357 .long int_return - _start + _START_OFFSET
359 /* No FPU on MPC85xx. This exception is not supposed to happen.
361 STD_EXCEPTION(0x0800, FPUnavailable, UnknownException)
365 * r0 - SYSCALL number
369 addis r11,r0,0 /* get functions table addr */
370 ori r11,r11,0 /* Note: this code is patched in trap_init */
371 addis r12,r0,0 /* get number of functions */
377 rlwinm r0,r0,2,0,31 /* fn_addr = fn_tbl[r0] */
381 li r20,0xd00-4 /* Get stack pointer */
383 subi r12,r12,12 /* Adjust stack pointer */
384 li r0,0xc00+_end_back-SystemCall
385 cmplw 0,r0,r12 /* Check stack overflow */
396 li r12,0xc00+_back-SystemCall
404 mfmsr r11 /* Disable interrupts */
408 SYNC /* Some chip revs need this... */
412 li r12,0xd00-4 /* restore regs */
422 addi r12,r12,12 /* Adjust stack pointer */
430 STD_EXCEPTION(0x0a00, Decrementer, timer_interrupt)
431 STD_EXCEPTION(0x0b00, IntervalTimer, UnknownException)
432 STD_EXCEPTION(0x0c00, WatchdogTimer, UnknownException)
434 STD_EXCEPTION(0x0d00, DataTLBError, UnknownException)
435 STD_EXCEPTION(0x0e00, InstructionTLBError, UnknownException)
437 CRIT_EXCEPTION(0x0f00, DebugBreakpoint, DebugException )
439 .globl _end_of_vectors
443 . = . + (0x100 - ( . & 0xff )) /* align for debug */
446 * This code finishes saving the registers to the exception frame
447 * and jumps to the appropriate handler for the exception.
448 * Register r21 is pointer into trap frame, r1 has new stack pointer.
450 .globl transfer_to_handler
462 andi. r24,r23,0x3f00 /* get vector offset */
466 mtspr SPRG2,r22 /* r1 is now kernel sp */
468 lwz r24,0(r23) /* virtual address of handler */
469 lwz r23,4(r23) /* where to go when done */
474 rfi /* jump to handler, enable MMU */
477 mfmsr r28 /* Disable interrupts */
481 SYNC /* Some chip revs need this... */
496 lwz r2,_NIP(r1) /* Restore environment */
507 mfmsr r28 /* Disable interrupts */
511 SYNC /* Some chip revs need this... */
526 lwz r2,_NIP(r1) /* Restore environment */
537 mfmsr r28 /* Disable interrupts */
541 SYNC /* Some chip revs need this... */
556 lwz r2,_NIP(r1) /* Restore environment */
570 ori r0,r0,L1CSR1_ICFI
575 blr /* entire I cache */
579 ori r0,r0,L1CSR0_DCFI
599 .globl icache_disable
612 andi. r3,r3,L1CSR1_ICE
630 .globl dcache_disable
643 andi. r3,r3,L1CSR0_DCE
666 /*------------------------------------------------------------------------------- */
668 /* Description: Input 8 bits */
669 /*------------------------------------------------------------------------------- */
675 /*------------------------------------------------------------------------------- */
677 /* Description: Output 8 bits */
678 /*------------------------------------------------------------------------------- */
685 /*------------------------------------------------------------------------------- */
686 /* Function: out16 */
687 /* Description: Output 16 bits */
688 /*------------------------------------------------------------------------------- */
695 /*------------------------------------------------------------------------------- */
696 /* Function: out16r */
697 /* Description: Byte reverse and output 16 bits */
698 /*------------------------------------------------------------------------------- */
705 /*------------------------------------------------------------------------------- */
706 /* Function: out32 */
707 /* Description: Output 32 bits */
708 /*------------------------------------------------------------------------------- */
715 /*------------------------------------------------------------------------------- */
716 /* Function: out32r */
717 /* Description: Byte reverse and output 32 bits */
718 /*------------------------------------------------------------------------------- */
725 /*------------------------------------------------------------------------------- */
727 /* Description: Input 16 bits */
728 /*------------------------------------------------------------------------------- */
734 /*------------------------------------------------------------------------------- */
735 /* Function: in16r */
736 /* Description: Input 16 bits and byte reverse */
737 /*------------------------------------------------------------------------------- */
743 /*------------------------------------------------------------------------------- */
745 /* Description: Input 32 bits */
746 /*------------------------------------------------------------------------------- */
752 /*------------------------------------------------------------------------------- */
753 /* Function: in32r */
754 /* Description: Input 32 bits and byte reverse */
755 /*------------------------------------------------------------------------------- */
761 /*------------------------------------------------------------------------------*/
764 * void relocate_code (addr_sp, gd, addr_moni)
766 * This "function" does not return, instead it continues in RAM
767 * after relocating the monitor code.
771 * r5 = length in bytes
776 mr r1,r3 /* Set new stack pointer */
777 mr r9,r4 /* Save copy of Init Data pointer */
778 mr r10,r5 /* Save copy of Destination Address */
780 mr r3,r5 /* Destination Address */
781 lis r4,CFG_MONITOR_BASE@h /* Source Address */
782 ori r4,r4,CFG_MONITOR_BASE@l
783 lwz r5,GOT(__init_end)
785 li r6,CFG_CACHELINE_SIZE /* Cache Line Size */
790 * New GOT-PTR = (old GOT-PTR - CFG_MONITOR_BASE) + Destination Address
796 /* First our own GOT */
798 /* the the one used by the C code */
808 beq cr1,4f /* In place copy is not necessary */
809 beq 7f /* Protect against 0 count */
828 * Now flush the cache: note that we must start from a cache aligned
829 * address. Otherwise we might miss one cache line.
833 beq 7f /* Always flush prefetch queue in any case */
841 sync /* Wait for all dcbst to complete on bus */
847 7: sync /* Wait for all icbi to complete on bus */
851 * Re-point the IVPR at RAM
856 * We are done. Do not return, instead branch to second part of board
857 * initialization, now running from RAM.
860 addi r0,r10,in_ram - _start + _START_OFFSET
862 blr /* NEVER RETURNS! */
867 * Relocation Function, r14 point to got2+0x8000
869 * Adjust got2 pointers, no need to check for 0, this code
870 * already puts a few entries in the table.
872 li r0,__got2_entries@sectoff@l
873 la r3,GOT(_GOT2_TABLE_)
874 lwz r11,GOT(_GOT2_TABLE_)
884 * Now adjust the fixups and the pointers to the fixups
885 * in case we need to move ourselves again.
887 2: li r0,__fixup_entries@sectoff@l
888 lwz r3,GOT(_FIXUP_TABLE_)
902 * Now clear BSS segment
904 lwz r3,GOT(__bss_start)
918 mr r3,r9 /* Init Data pointer */
919 mr r4,r10 /* Destination Address */
923 * Copy exception vector code to low memory
926 * r7: source address, r8: end address, r9: target address
930 lwz r7,GOT(_start_of_vectors)
931 lwz r8,GOT(_end_of_vectors)
933 li r9,0x100 /* reset vector always at 0x100 */
936 bgelr /* return if r7>=r8 - just in case */
938 mflr r4 /* save link register */
948 * relocate `hdlr' and `int_return' entries
950 li r7,.L_CriticalInput - _start + _START_OFFSET
952 li r7,.L_MachineCheck - _start + _START_OFFSET
954 li r7,.L_DataStorage - _start + _START_OFFSET
956 li r7,.L_InstStorage - _start + _START_OFFSET
958 li r7,.L_ExtInterrupt - _start + _START_OFFSET
960 li r7,.L_Alignment - _start + _START_OFFSET
962 li r7,.L_ProgramCheck - _start + _START_OFFSET
964 li r7,.L_FPUnavailable - _start + _START_OFFSET
966 li r7,.L_Decrementer - _start + _START_OFFSET
968 li r7,.L_IntervalTimer - _start + _START_OFFSET
969 li r8,_end_of_vectors - _start + _START_OFFSET
972 addi r7,r7,0x100 /* next exception vector */
979 mtlr r4 /* restore link register */
983 * Function: relocate entries for one exception vector
986 lwz r0,0(r7) /* hdlr ... */
987 add r0,r0,r3 /* ... += dest_addr */
990 lwz r0,4(r7) /* int_return ... */
991 add r0,r0,r3 /* ... += dest_addr */
996 .globl unlock_ram_in_cache
998 /* invalidate the INIT_RAM section */
999 lis r3,(CFG_INIT_RAM_ADDR & ~31)@h
1000 ori r3,r3,(CFG_INIT_RAM_ADDR & ~31)@l
1003 slwi r4,r4,(10 - 1 - L1_CACHE_SHIFT)
1006 addi r3,r3,CFG_CACHELINE_SIZE
1010 /* Invalidate the TLB entries for the cache */
1011 lis r3,CFG_INIT_RAM_ADDR@h
1012 ori r3,r3,CFG_INIT_RAM_ADDR@l