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.
33 #include <timestamp.h>
36 #define _LINUX_CONFIG_H 1 /* avoid reading Linux autoconf.h file */
38 #include <ppc_asm.tmpl>
41 #include <asm/cache.h>
44 #ifndef CONFIG_IDENT_STRING
45 #define CONFIG_IDENT_STRING ""
49 #define MSR_KERNEL ( MSR_ME ) /* Machine Check */
52 * Set up GOT: Global Offset Table
54 * Use r14 to access the GOT
57 GOT_ENTRY(_GOT2_TABLE_)
58 GOT_ENTRY(_FIXUP_TABLE_)
61 GOT_ENTRY(_start_of_vectors)
62 GOT_ENTRY(_end_of_vectors)
63 GOT_ENTRY(transfer_to_handler)
67 GOT_ENTRY(__bss_start)
71 * e500 Startup -- after reset only the last 4KB of the effective
72 * address space is mapped in the MMU L2 TLB1 Entry0. The .bootpg
73 * section is located at THIS LAST page and basically does three
74 * things: clear some registers, set up exception tables and
75 * add more TLB entries for 'larger spaces'(e.g. the boot rom) to
76 * continue the boot procedure.
78 * Once the boot rom is mapped by TLB entries we can proceed
79 * with normal startup.
88 /* clear registers/arrays not reset by hardware */
92 mtspr L1CSR0,r0 /* invalidate d-cache */
93 mtspr L1CSR1,r0 /* invalidate i-cache */
96 mtspr DBSR,r1 /* Clear all valid bits */
99 * Enable L1 Caches early
103 lis r2,L1CSR0_CPE@H /* enable parity */
105 mtspr L1CSR0,r2 /* enable L1 Dcache */
107 mtspr L1CSR1,r2 /* enable L1 Icache */
111 /* Setup interrupt vectors */
116 mtspr IVOR0,r1 /* 0: Critical input */
118 mtspr IVOR1,r1 /* 1: Machine check */
120 mtspr IVOR2,r1 /* 2: Data storage */
122 mtspr IVOR3,r1 /* 3: Instruction storage */
124 mtspr IVOR4,r1 /* 4: External interrupt */
126 mtspr IVOR5,r1 /* 5: Alignment */
128 mtspr IVOR6,r1 /* 6: Program check */
130 mtspr IVOR7,r1 /* 7: floating point unavailable */
132 mtspr IVOR8,r1 /* 8: System call */
133 /* 9: Auxiliary processor unavailable(unsupported) */
135 mtspr IVOR10,r1 /* 10: Decrementer */
137 mtspr IVOR11,r1 /* 11: Interval timer */
139 mtspr IVOR12,r1 /* 12: Watchdog timer */
141 mtspr IVOR13,r1 /* 13: Data TLB error */
143 mtspr IVOR14,r1 /* 14: Instruction TLB error */
145 mtspr IVOR15,r1 /* 15: Debug */
147 /* Clear and set up some registers. */
150 mtspr DEC,r0 /* prevent dec exceptions */
151 mttbl r0 /* prevent fit & wdt exceptions */
153 mtspr TSR,r1 /* clear all timer exception status */
154 mtspr TCR,r0 /* disable all */
155 mtspr ESR,r0 /* clear exception syndrome register */
156 mtspr MCSR,r0 /* machine check syndrome register */
157 mtxer r0 /* clear integer exception register */
159 /* Enable Time Base and Select Time Base Clock */
160 lis r0,HID0_EMCP@h /* Enable machine check */
161 #if defined(CONFIG_ENABLE_36BIT_PHYS)
162 ori r0,r0,HID0_ENMAS7@l /* Enable MAS7 */
164 #ifndef CONFIG_E500MC
165 ori r0,r0,HID0_TBEN@l /* Enable Timebase */
169 #ifndef CONFIG_E500MC
170 li r0,(HID1_ASTME|HID1_ABE)@l /* Addr streaming & broadcast */
174 /* Enable Branch Prediction */
175 #if defined(CONFIG_BTB)
176 li r0,0x201 /* BBFI = 1, BPEN = 1 */
180 #if defined(CONFIG_SYS_INIT_DBCR)
183 mtspr DBSR,r1 /* Clear all status bits */
184 lis r0,CONFIG_SYS_INIT_DBCR@h /* DBCR0[IDM] must be set */
185 ori r0,r0,CONFIG_SYS_INIT_DBCR@l
189 /* create a temp mapping in AS=1 to the 4M boot window */
190 lis r6,FSL_BOOKE_MAS0(1, 15, 0)@h
191 ori r6,r6,FSL_BOOKE_MAS0(1, 15, 0)@l
193 lis r7,FSL_BOOKE_MAS1(1, 1, 0, 1, BOOKE_PAGESZ_4M)@h
194 ori r7,r7,FSL_BOOKE_MAS1(1, 1, 0, 1, BOOKE_PAGESZ_4M)@l
196 lis r8,FSL_BOOKE_MAS2(TEXT_BASE & 0xffc00000, (MAS2_I|MAS2_G))@h
197 ori r8,r8,FSL_BOOKE_MAS2(TEXT_BASE & 0xffc00000, (MAS2_I|MAS2_G))@l
199 /* The 85xx has the default boot window 0xff800000 - 0xffffffff */
200 lis r9,FSL_BOOKE_MAS3(0xffc00000, 0, (MAS3_SX|MAS3_SW|MAS3_SR))@h
201 ori r9,r9,FSL_BOOKE_MAS3(0xffc00000, 0, (MAS3_SX|MAS3_SW|MAS3_SR))@l
211 /* create a temp mapping in AS=1 to the stack */
212 lis r6,FSL_BOOKE_MAS0(1, 14, 0)@h
213 ori r6,r6,FSL_BOOKE_MAS0(1, 14, 0)@l
215 lis r7,FSL_BOOKE_MAS1(1, 1, 0, 1, BOOKE_PAGESZ_16K)@h
216 ori r7,r7,FSL_BOOKE_MAS1(1, 1, 0, 1, BOOKE_PAGESZ_16K)@l
218 lis r8,FSL_BOOKE_MAS2(CONFIG_SYS_INIT_RAM_ADDR, 0)@h
219 ori r8,r8,FSL_BOOKE_MAS2(CONFIG_SYS_INIT_RAM_ADDR, 0)@l
221 lis r9,FSL_BOOKE_MAS3(CONFIG_SYS_INIT_RAM_ADDR, 0, (MAS3_SX|MAS3_SW|MAS3_SR))@h
222 ori r9,r9,FSL_BOOKE_MAS3(CONFIG_SYS_INIT_RAM_ADDR, 0, (MAS3_SX|MAS3_SW|MAS3_SR))@l
232 lis r6,MSR_CE|MSR_ME|MSR_DE|MSR_IS|MSR_DS@h
233 ori r6,r6,MSR_CE|MSR_ME|MSR_DE|MSR_IS|MSR_DS@l
235 ori r7,r7,switch_as@l
242 /* L1 DCache is used for initial RAM */
244 /* Allocate Initial RAM in data cache.
246 lis r3,CONFIG_SYS_INIT_RAM_ADDR@h
247 ori r3,r3,CONFIG_SYS_INIT_RAM_ADDR@l
250 /* cache size * 1024 / (2 * L1 line size) */
251 slwi r2, r2, (10 - 1 - L1_CACHE_SHIFT)
257 addi r3,r3,CONFIG_SYS_CACHELINE_SIZE
260 /* Jump out the last 4K page and continue to 'normal' start */
261 #ifdef CONFIG_SYS_RAMBOOT
264 /* Calculate absolute address in FLASH and jump there */
265 /*--------------------------------------------------------------*/
266 lis r3,CONFIG_SYS_MONITOR_BASE@h
267 ori r3,r3,CONFIG_SYS_MONITOR_BASE@l
268 addi r3,r3,_start_cont - _start + _START_OFFSET
276 .long 0x27051956 /* U-BOOT Magic Number */
277 .globl version_string
279 .ascii U_BOOT_VERSION
280 .ascii " (", U_BOOT_DATE, " - ", U_BOOT_TIME, ")"
281 .ascii CONFIG_IDENT_STRING, "\0"
286 /* Setup the stack in initial RAM,could be L2-as-SRAM or L1 dcache*/
287 lis r1,CONFIG_SYS_INIT_RAM_ADDR@h
288 ori r1,r1,CONFIG_SYS_INIT_SP_OFFSET@l
292 stwu r0,-4(r1) /* Terminate call chain */
294 stwu r1,-8(r1) /* Save back chain and move SP */
295 lis r0,RESET_VECTOR@h /* Address of reset vector */
296 ori r0,r0,RESET_VECTOR@l
297 stwu r1,-8(r1) /* Save back chain and move SP */
298 stw r0,+12(r1) /* Save return addr (underflow vect) */
303 /* switch back to AS = 0 */
304 lis r3,(MSR_CE|MSR_ME|MSR_DE)@h
305 ori r3,r3,(MSR_CE|MSR_ME|MSR_DE)@l
313 . = EXC_OFF_SYS_RESET
314 .globl _start_of_vectors
317 /* Critical input. */
318 CRIT_EXCEPTION(0x0100, CriticalInput, CritcalInputException)
321 MCK_EXCEPTION(0x200, MachineCheck, MachineCheckException)
323 /* Data Storage exception. */
324 STD_EXCEPTION(0x0300, DataStorage, UnknownException)
326 /* Instruction Storage exception. */
327 STD_EXCEPTION(0x0400, InstStorage, UnknownException)
329 /* External Interrupt exception. */
330 STD_EXCEPTION(0x0500, ExtInterrupt, ExtIntException)
332 /* Alignment exception. */
335 EXCEPTION_PROLOG(SRR0, SRR1)
340 addi r3,r1,STACK_FRAME_OVERHEAD
342 rlwimi r20,r23,0,16,16 /* copy EE bit from saved MSR */
343 lwz r6,GOT(transfer_to_handler)
347 .long AlignmentException - _start + _START_OFFSET
348 .long int_return - _start + _START_OFFSET
350 /* Program check exception */
353 EXCEPTION_PROLOG(SRR0, SRR1)
354 addi r3,r1,STACK_FRAME_OVERHEAD
356 rlwimi r20,r23,0,16,16 /* copy EE bit from saved MSR */
357 lwz r6,GOT(transfer_to_handler)
361 .long ProgramCheckException - _start + _START_OFFSET
362 .long int_return - _start + _START_OFFSET
364 /* No FPU on MPC85xx. This exception is not supposed to happen.
366 STD_EXCEPTION(0x0800, FPUnavailable, UnknownException)
370 * r0 - SYSCALL number
374 addis r11,r0,0 /* get functions table addr */
375 ori r11,r11,0 /* Note: this code is patched in trap_init */
376 addis r12,r0,0 /* get number of functions */
382 rlwinm r0,r0,2,0,31 /* fn_addr = fn_tbl[r0] */
386 li r20,0xd00-4 /* Get stack pointer */
388 subi r12,r12,12 /* Adjust stack pointer */
389 li r0,0xc00+_end_back-SystemCall
390 cmplw 0,r0,r12 /* Check stack overflow */
401 li r12,0xc00+_back-SystemCall
409 mfmsr r11 /* Disable interrupts */
413 SYNC /* Some chip revs need this... */
417 li r12,0xd00-4 /* restore regs */
427 addi r12,r12,12 /* Adjust stack pointer */
435 STD_EXCEPTION(0x0a00, Decrementer, timer_interrupt)
436 STD_EXCEPTION(0x0b00, IntervalTimer, UnknownException)
437 STD_EXCEPTION(0x0c00, WatchdogTimer, UnknownException)
439 STD_EXCEPTION(0x0d00, DataTLBError, UnknownException)
440 STD_EXCEPTION(0x0e00, InstructionTLBError, UnknownException)
442 CRIT_EXCEPTION(0x0f00, DebugBreakpoint, DebugException )
444 .globl _end_of_vectors
448 . = . + (0x100 - ( . & 0xff )) /* align for debug */
451 * This code finishes saving the registers to the exception frame
452 * and jumps to the appropriate handler for the exception.
453 * Register r21 is pointer into trap frame, r1 has new stack pointer.
455 .globl transfer_to_handler
467 andi. r24,r23,0x3f00 /* get vector offset */
471 mtspr SPRG2,r22 /* r1 is now kernel sp */
473 lwz r24,0(r23) /* virtual address of handler */
474 lwz r23,4(r23) /* where to go when done */
479 rfi /* jump to handler, enable MMU */
482 mfmsr r28 /* Disable interrupts */
486 SYNC /* Some chip revs need this... */
501 lwz r2,_NIP(r1) /* Restore environment */
512 mfmsr r28 /* Disable interrupts */
516 SYNC /* Some chip revs need this... */
531 lwz r2,_NIP(r1) /* Restore environment */
542 mfmsr r28 /* Disable interrupts */
546 SYNC /* Some chip revs need this... */
561 lwz r2,_NIP(r1) /* Restore environment */
573 .globl invalidate_icache
576 ori r0,r0,L1CSR1_ICFI
581 blr /* entire I cache */
583 .globl invalidate_dcache
586 ori r0,r0,L1CSR0_DCFI
606 .globl icache_disable
619 andi. r3,r3,L1CSR1_ICE
637 .globl dcache_disable
650 andi. r3,r3,L1CSR0_DCE
673 /*------------------------------------------------------------------------------- */
675 /* Description: Input 8 bits */
676 /*------------------------------------------------------------------------------- */
682 /*------------------------------------------------------------------------------- */
684 /* Description: Output 8 bits */
685 /*------------------------------------------------------------------------------- */
692 /*------------------------------------------------------------------------------- */
693 /* Function: out16 */
694 /* Description: Output 16 bits */
695 /*------------------------------------------------------------------------------- */
702 /*------------------------------------------------------------------------------- */
703 /* Function: out16r */
704 /* Description: Byte reverse and output 16 bits */
705 /*------------------------------------------------------------------------------- */
712 /*------------------------------------------------------------------------------- */
713 /* Function: out32 */
714 /* Description: Output 32 bits */
715 /*------------------------------------------------------------------------------- */
722 /*------------------------------------------------------------------------------- */
723 /* Function: out32r */
724 /* Description: Byte reverse and output 32 bits */
725 /*------------------------------------------------------------------------------- */
732 /*------------------------------------------------------------------------------- */
734 /* Description: Input 16 bits */
735 /*------------------------------------------------------------------------------- */
741 /*------------------------------------------------------------------------------- */
742 /* Function: in16r */
743 /* Description: Input 16 bits and byte reverse */
744 /*------------------------------------------------------------------------------- */
750 /*------------------------------------------------------------------------------- */
752 /* Description: Input 32 bits */
753 /*------------------------------------------------------------------------------- */
759 /*------------------------------------------------------------------------------- */
760 /* Function: in32r */
761 /* Description: Input 32 bits and byte reverse */
762 /*------------------------------------------------------------------------------- */
768 /*------------------------------------------------------------------------------*/
771 * void relocate_code (addr_sp, gd, addr_moni)
773 * This "function" does not return, instead it continues in RAM
774 * after relocating the monitor code.
778 * r5 = length in bytes
783 mr r1,r3 /* Set new stack pointer */
784 mr r9,r4 /* Save copy of Init Data pointer */
785 mr r10,r5 /* Save copy of Destination Address */
787 mr r3,r5 /* Destination Address */
788 lis r4,CONFIG_SYS_MONITOR_BASE@h /* Source Address */
789 ori r4,r4,CONFIG_SYS_MONITOR_BASE@l
790 lwz r5,GOT(__init_end)
792 li r6,CONFIG_SYS_CACHELINE_SIZE /* Cache Line Size */
797 * New GOT-PTR = (old GOT-PTR - CONFIG_SYS_MONITOR_BASE) + Destination Address
803 /* First our own GOT */
805 /* the the one used by the C code */
815 beq cr1,4f /* In place copy is not necessary */
816 beq 7f /* Protect against 0 count */
835 * Now flush the cache: note that we must start from a cache aligned
836 * address. Otherwise we might miss one cache line.
840 beq 7f /* Always flush prefetch queue in any case */
848 sync /* Wait for all dcbst to complete on bus */
854 7: sync /* Wait for all icbi to complete on bus */
858 * Re-point the IVPR at RAM
863 * We are done. Do not return, instead branch to second part of board
864 * initialization, now running from RAM.
867 addi r0,r10,in_ram - _start + _START_OFFSET
869 blr /* NEVER RETURNS! */
874 * Relocation Function, r14 point to got2+0x8000
876 * Adjust got2 pointers, no need to check for 0, this code
877 * already puts a few entries in the table.
879 li r0,__got2_entries@sectoff@l
880 la r3,GOT(_GOT2_TABLE_)
881 lwz r11,GOT(_GOT2_TABLE_)
891 * Now adjust the fixups and the pointers to the fixups
892 * in case we need to move ourselves again.
894 2: li r0,__fixup_entries@sectoff@l
895 lwz r3,GOT(_FIXUP_TABLE_)
909 * Now clear BSS segment
911 lwz r3,GOT(__bss_start)
925 mr r3,r9 /* Init Data pointer */
926 mr r4,r10 /* Destination Address */
930 * Copy exception vector code to low memory
933 * r7: source address, r8: end address, r9: target address
937 lwz r7,GOT(_start_of_vectors)
938 lwz r8,GOT(_end_of_vectors)
940 li r9,0x100 /* reset vector always at 0x100 */
943 bgelr /* return if r7>=r8 - just in case */
945 mflr r4 /* save link register */
955 * relocate `hdlr' and `int_return' entries
957 li r7,.L_CriticalInput - _start + _START_OFFSET
959 li r7,.L_MachineCheck - _start + _START_OFFSET
961 li r7,.L_DataStorage - _start + _START_OFFSET
963 li r7,.L_InstStorage - _start + _START_OFFSET
965 li r7,.L_ExtInterrupt - _start + _START_OFFSET
967 li r7,.L_Alignment - _start + _START_OFFSET
969 li r7,.L_ProgramCheck - _start + _START_OFFSET
971 li r7,.L_FPUnavailable - _start + _START_OFFSET
973 li r7,.L_Decrementer - _start + _START_OFFSET
975 li r7,.L_IntervalTimer - _start + _START_OFFSET
976 li r8,_end_of_vectors - _start + _START_OFFSET
979 addi r7,r7,0x100 /* next exception vector */
986 mtlr r4 /* restore link register */
990 * Function: relocate entries for one exception vector
993 lwz r0,0(r7) /* hdlr ... */
994 add r0,r0,r3 /* ... += dest_addr */
997 lwz r0,4(r7) /* int_return ... */
998 add r0,r0,r3 /* ... += dest_addr */
1003 .globl unlock_ram_in_cache
1004 unlock_ram_in_cache:
1005 /* invalidate the INIT_RAM section */
1006 lis r3,(CONFIG_SYS_INIT_RAM_ADDR & ~(CONFIG_SYS_CACHELINE_SIZE-1))@h
1007 ori r3,r3,(CONFIG_SYS_INIT_RAM_ADDR & ~(CONFIG_SYS_CACHELINE_SIZE-1))@l
1010 slwi r4,r4,(10 - 1 - L1_CACHE_SHIFT)
1013 addi r3,r3,CONFIG_SYS_CACHELINE_SIZE
1017 /* Invalidate the TLB entries for the cache */
1018 lis r3,CONFIG_SYS_INIT_RAM_ADDR@h
1019 ori r3,r3,CONFIG_SYS_INIT_RAM_ADDR@l
1032 mfspr r3,SPRN_L1CFG0
1034 rlwinm r5,r3,9,3 /* Extract cache block size */
1035 twlgti r5,1 /* Only 32 and 64 byte cache blocks
1036 * are currently defined.
1039 subfic r6,r5,2 /* r6 = log2(1KiB / cache block size) -
1040 * log2(number of ways)
1042 slw r5,r4,r5 /* r5 = cache block size */
1044 rlwinm r7,r3,0,0xff /* Extract number of KiB in the cache */
1045 mulli r7,r7,13 /* An 8-way cache will require 13
1050 /* save off HID0 and set DCFA */
1052 ori r9,r8,HID0_DCFA@l
1059 1: lwz r3,0(r4) /* Load... */
1067 1: dcbf 0,r4 /* ...and flush. */