2 * Copyright 2004, 2007 Freescale Semiconductor.
3 * Srikanth Srinivasan <srikanth.srinivaan@freescale.com>
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 86xx PowerPC based Embedded Boards
27 * The processor starts at 0xfff00100 and the code is executed
28 * from flash. The code is organized to be at an other address
29 * in memory, but as long we don't jump around before relocating.
30 * board_init lies at a quite high address and when the cpu has
31 * jumped there, everything is ok.
37 #include <ppc_asm.tmpl>
40 #include <asm/cache.h>
43 #ifndef CONFIG_IDENT_STRING
44 #define CONFIG_IDENT_STRING ""
48 * Need MSR_DR | MSR_IR enabled to access I/O (printf) in exceptions
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 * r3 - 1st arg to board_init(): IMMP pointer
72 * r4 - 2nd arg to board_init(): boot flag
75 .long 0x27051956 /* U-Boot Magic Number */
79 .ascii " (", __DATE__, " - ", __TIME__, ")"
80 .ascii CONFIG_IDENT_STRING, "\0"
85 li r21, BOOTFLAG_COLD /* Normal Power-On: Boot from FLASH */
89 . = EXC_OFF_SYS_RESET + 0x10
93 li r21, BOOTFLAG_WARM /* Software reboot */
97 /* the boot code is located below the exception table */
99 .globl _start_of_vectors
103 STD_EXCEPTION(0x200, MachineCheck, MachineCheckException)
105 /* Data Storage exception. */
106 STD_EXCEPTION(0x300, DataStorage, UnknownException)
108 /* Instruction Storage exception. */
109 STD_EXCEPTION(0x400, InstStorage, UnknownException)
111 /* External Interrupt exception. */
112 STD_EXCEPTION(0x500, ExtInterrupt, external_interrupt)
114 /* Alignment exception. */
117 EXCEPTION_PROLOG(SRR0, SRR1)
122 addi r3,r1,STACK_FRAME_OVERHEAD
124 rlwimi r20,r23,0,16,16 /* copy EE bit from saved MSR */
125 lwz r6,GOT(transfer_to_handler)
129 .long AlignmentException - _start + EXC_OFF_SYS_RESET
130 .long int_return - _start + EXC_OFF_SYS_RESET
132 /* Program check exception */
135 EXCEPTION_PROLOG(SRR0, SRR1)
136 addi r3,r1,STACK_FRAME_OVERHEAD
138 rlwimi r20,r23,0,16,16 /* copy EE bit from saved MSR */
139 lwz r6,GOT(transfer_to_handler)
143 .long ProgramCheckException - _start + EXC_OFF_SYS_RESET
144 .long int_return - _start + EXC_OFF_SYS_RESET
146 STD_EXCEPTION(0x800, FPUnavailable, UnknownException)
148 /* I guess we could implement decrementer, and may have
149 * to someday for timekeeping.
151 STD_EXCEPTION(0x900, Decrementer, timer_interrupt)
152 STD_EXCEPTION(0xa00, Trap_0a, UnknownException)
153 STD_EXCEPTION(0xb00, Trap_0b, UnknownException)
154 STD_EXCEPTION(0xc00, SystemCall, UnknownException)
155 STD_EXCEPTION(0xd00, SingleStep, UnknownException)
156 STD_EXCEPTION(0xe00, Trap_0e, UnknownException)
157 STD_EXCEPTION(0xf00, Trap_0f, UnknownException)
158 STD_EXCEPTION(0x1000, SoftEmu, SoftEmuException)
159 STD_EXCEPTION(0x1100, InstructionTLBMiss, UnknownException)
160 STD_EXCEPTION(0x1200, DataTLBMiss, UnknownException)
161 STD_EXCEPTION(0x1300, InstructionTLBError, UnknownException)
162 STD_EXCEPTION(0x1400, DataTLBError, UnknownException)
163 STD_EXCEPTION(0x1500, Reserved5, UnknownException)
164 STD_EXCEPTION(0x1600, Reserved6, UnknownException)
165 STD_EXCEPTION(0x1700, Reserved7, UnknownException)
166 STD_EXCEPTION(0x1800, Reserved8, UnknownException)
167 STD_EXCEPTION(0x1900, Reserved9, UnknownException)
168 STD_EXCEPTION(0x1a00, ReservedA, UnknownException)
169 STD_EXCEPTION(0x1b00, ReservedB, UnknownException)
170 STD_EXCEPTION(0x1c00, DataBreakpoint, UnknownException)
171 STD_EXCEPTION(0x1d00, InstructionBreakpoint, UnknownException)
172 STD_EXCEPTION(0x1e00, PeripheralBreakpoint, UnknownException)
173 STD_EXCEPTION(0x1f00, DevPortBreakpoint, UnknownException)
175 .globl _end_of_vectors
183 /* if this is a multi-core system we need to check which cpu
184 * this is, if it is not cpu 0 send the cpu to the linux reset
186 #if (CONFIG_NUM_CPUS > 1)
189 rlwinm r0,r0,27,31,31
193 bl secondary_cpu_setup
198 /* disable everything */
209 /* init the L2 cache */
211 ori r3, r3, L2_INIT@l
213 /* invalidate the L2 cache */
214 bl l2cache_invalidate
219 * Calculate absolute address in FLASH and jump there
220 *------------------------------------------------------*/
221 lis r3, CFG_MONITOR_BASE@h
222 ori r3, r3, CFG_MONITOR_BASE@l
223 addi r3, r3, in_flash - _start + EXC_OFF_SYS_RESET
228 /* let the C-code set up the rest */
230 /* Be careful to keep code relocatable ! */
231 /*------------------------------------------------------*/
232 /* perform low-level init */
234 /* enable extended addressing */
241 * Cache must be enabled here for stack-in-cache trick.
242 * This means we need to enable the BATS.
243 * Cache should be turned on after BATs, since by default
244 * everything is write-through.
247 /* enable address translation */
251 /* enable and invalidate the data cache */
252 /* bl l1dcache_enable */
260 #ifdef CFG_INIT_RAM_LOCK
265 /* set up the stack pointer in our newly created
267 lis r1, (CFG_INIT_RAM_ADDR + CFG_GBL_DATA_OFFSET)@h
268 ori r1, r1, (CFG_INIT_RAM_ADDR + CFG_GBL_DATA_OFFSET)@l
270 li r0, 0 /* Make room for stack frame header and */
271 stwu r0, -4(r1) /* clear final stack frame so that */
272 stwu r0, -4(r1) /* stack backtraces terminate cleanly */
274 GET_GOT /* initialize GOT access */
276 /* setup the rest of the bats */
281 #if (CFG_CCSRBAR_DEFAULT != CFG_CCSRBAR)
289 /* run low-level CPU init code (from Flash) */
295 /* Load PX_AUX register address in r4 */
298 /* Load contents of PX_AUX in r3 bits 24 to 31*/
301 /* Mask and obtain the bit in r3 */
302 rlwinm. r3, r3, 0, 24, 24
303 /* If not zero, jump and continue with u-boot */
306 /* Load back contents of PX_AUX in r3 bits 24 to 31 */
308 /* Set the MSB of the register value */
310 /* Write value in r3 back to PX_AUX */
313 /* Get the address to jump to in r3*/
314 lis r3, CFG_DIAG_ADDR@h
315 ori r3, r3, CFG_DIAG_ADDR@l
317 /* Load the LR with the branch address */
320 /* Branch to diagnostic */
326 /* bl l2cache_enable */
330 /* run 1st part of board init code (from Flash) */
336 .globl invalidate_bats
340 /* invalidate BATs */
365 /* setup_bats - set them up to some initial state */
366 /* Skip any BATS setup in early_bats */
373 addis r4, r0, CFG_IBAT0L@h
374 ori r4, r4, CFG_IBAT0L@l
375 addis r3, r0, CFG_IBAT0U@h
376 ori r3, r3, CFG_IBAT0U@l
382 addis r4, r0, CFG_DBAT0L@h
383 ori r4, r4, CFG_DBAT0L@l
384 addis r3, r0, CFG_DBAT0U@h
385 ori r3, r3, CFG_DBAT0U@l
391 addis r4, r0, CFG_IBAT1L@h
392 ori r4, r4, CFG_IBAT1L@l
393 addis r3, r0, CFG_IBAT1U@h
394 ori r3, r3, CFG_IBAT1U@l
400 addis r4, r0, CFG_DBAT1L@h
401 ori r4, r4, CFG_DBAT1L@l
402 addis r3, r0, CFG_DBAT1U@h
403 ori r3, r3, CFG_DBAT1U@l
409 addis r4, r0, CFG_IBAT2L@h
410 ori r4, r4, CFG_IBAT2L@l
411 addis r3, r0, CFG_IBAT2U@h
412 ori r3, r3, CFG_IBAT2U@l
418 addis r4, r0, CFG_DBAT2L@h
419 ori r4, r4, CFG_DBAT2L@l
420 addis r3, r0, CFG_DBAT2U@h
421 ori r3, r3, CFG_DBAT2U@l
427 addis r4, r0, CFG_IBAT3L@h
428 ori r4, r4, CFG_IBAT3L@l
429 addis r3, r0, CFG_IBAT3U@h
430 ori r3, r3, CFG_IBAT3U@l
436 addis r4, r0, CFG_DBAT3L@h
437 ori r4, r4, CFG_DBAT3L@l
438 addis r3, r0, CFG_DBAT3U@h
439 ori r3, r3, CFG_DBAT3U@l
445 addis r4, r0, CFG_IBAT4L@h
446 ori r4, r4, CFG_IBAT4L@l
447 addis r3, r0, CFG_IBAT4U@h
448 ori r3, r3, CFG_IBAT4U@l
454 addis r4, r0, CFG_DBAT4L@h
455 ori r4, r4, CFG_DBAT4L@l
456 addis r3, r0, CFG_DBAT4U@h
457 ori r3, r3, CFG_DBAT4U@l
463 addis r4, r0, CFG_IBAT7L@h
464 ori r4, r4, CFG_IBAT7L@l
465 addis r3, r0, CFG_IBAT7U@h
466 ori r3, r3, CFG_IBAT7U@l
472 addis r4, r0, CFG_DBAT7L@h
473 ori r4, r4, CFG_DBAT7L@l
474 addis r3, r0, CFG_DBAT7U@h
475 ori r3, r3, CFG_DBAT7U@l
486 * Set up bats needed early on - this is usually the BAT for the
487 * stack-in-cache and the Flash
493 ori r4, r4, CFG_IBAT5L@l
495 ori r3, r3, CFG_IBAT5U@l
502 ori r4, r4, CFG_DBAT5L@l
504 ori r3, r3, CFG_DBAT5U@l
511 ori r4, r4, CFG_IBAT6L@l
513 ori r3, r3, CFG_IBAT6U@l
520 ori r4, r4, CFG_DBAT6L@l
522 ori r3, r3, CFG_DBAT6U@l
541 .globl enable_addr_trans
543 /* enable address translation */
545 ori r5, r5, (MSR_IR | MSR_DR)
550 .globl disable_addr_trans
552 /* disable address translation */
555 andi. r0, r3, (MSR_IR | MSR_DR)
563 * This code finishes saving the registers to the exception frame
564 * and jumps to the appropriate handler for the exception.
565 * Register r21 is pointer into trap frame, r1 has new stack pointer.
567 .globl transfer_to_handler
578 andi. r24,r23,0x3f00 /* get vector offset */
582 mtspr SPRG2,r22 /* r1 is now kernel sp */
583 lwz r24,0(r23) /* virtual address of handler */
584 lwz r23,4(r23) /* where to go when done */
589 rfi /* jump to handler, enable MMU */
592 mfmsr r28 /* Disable interrupts */
596 SYNC /* Some chip revs need this... */
611 lwz r2,_NIP(r1) /* Restore environment */
638 * Description: Input 8 bits
647 * Description: Output 8 bits
656 * Description: Output 16 bits
665 * Description: Byte reverse and output 16 bits
674 * Description: Output 32 bits
683 * Description: Byte reverse and output 32 bits
692 * Description: Input 16 bits
701 * Description: Input 16 bits and byte reverse
710 * Description: Input 32 bits
719 * Description: Input 32 bits and byte reverse
728 * Description: Data Cache block flush
729 * Input: r3 = effective address
739 * Description: Data Cache block Invalidate
740 * Input: r3 = effective address
750 * Description: Data Cache block zero.
751 * Input: r3 = effective address
761 * Description: Processor Synchronize
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
784 mr r1, r3 /* Set new stack pointer */
785 mr r9, r4 /* Save copy of Global Data pointer */
786 mr r29, r9 /* Save for DECLARE_GLOBAL_DATA_PTR */
787 mr r10, r5 /* Save copy of Destination Address */
789 mr r3, r5 /* Destination Address */
790 lis r4, CFG_MONITOR_BASE@h /* Source Address */
791 ori r4, r4, CFG_MONITOR_BASE@l
792 lwz r5, GOT(__init_end)
794 li r6, CFG_CACHELINE_SIZE /* Cache Line Size */
799 * New GOT-PTR = (old GOT-PTR - CFG_MONITOR_BASE) + Destination Address
805 /* First our own GOT */
807 /* then the one used by the C code */
814 bl board_relocate_rom
816 mr r3, r10 /* Destination Address */
817 lis r4, CFG_MONITOR_BASE@h /* Source Address */
818 ori r4, r4, CFG_MONITOR_BASE@l
819 lwz r5, GOT(__init_end)
821 li r6, CFG_CACHELINE_SIZE /* Cache Line Size */
826 beq cr1,4f /* In place copy is not necessary */
827 beq 7f /* Protect against 0 count */
846 * Now flush the cache: note that we must start from a cache aligned
847 * address. Otherwise we might miss one cache line.
851 beq 7f /* Always flush prefetch queue in any case */
859 sync /* Wait for all dcbst to complete on bus */
865 7: sync /* Wait for all icbi to complete on bus */
869 * We are done. Do not return, instead branch to second part of board
870 * initialization, now running from RAM.
872 addi r0, r10, in_ram - _start + EXC_OFF_SYS_RESET
881 * Relocation Function, r14 point to got2+0x8000
883 * Adjust got2 pointers, no need to check for 0, this code
884 * already puts a few entries in the table.
886 li r0,__got2_entries@sectoff@l
887 la r3,GOT(_GOT2_TABLE_)
888 lwz r11,GOT(_GOT2_TABLE_)
898 * Now adjust the fixups and the pointers to the fixups
899 * in case we need to move ourselves again.
901 2: li r0,__fixup_entries@sectoff@l
902 lwz r3,GOT(_FIXUP_TABLE_)
916 * Now clear BSS segment
918 lwz r3,GOT(__bss_start)
931 mr r3, r9 /* Init Date pointer */
932 mr r4, r10 /* Destination Address */
935 /* not reached - end relocate_code */
936 /*-----------------------------------------------------------------------*/
939 * Copy exception vector code to low memory
942 * r7: source address, r8: end address, r9: target address
947 lwz r8, GOT(_end_of_vectors)
949 li r9, 0x100 /* reset vector always at 0x100 */
952 bgelr /* return if r7>=r8 - just in case */
954 mflr r4 /* save link register */
964 * relocate `hdlr' and `int_return' entries
966 li r7, .L_MachineCheck - _start + EXC_OFF_SYS_RESET
967 li r8, Alignment - _start + EXC_OFF_SYS_RESET
970 addi r7, r7, 0x100 /* next exception vector */
974 li r7, .L_Alignment - _start + EXC_OFF_SYS_RESET
977 li r7, .L_ProgramCheck - _start + EXC_OFF_SYS_RESET
980 li r7, .L_FPUnavailable - _start + EXC_OFF_SYS_RESET
981 li r8, SystemCall - _start + EXC_OFF_SYS_RESET
984 addi r7, r7, 0x100 /* next exception vector */
988 li r7, .L_SingleStep - _start + EXC_OFF_SYS_RESET
989 li r8, _end_of_vectors - _start + EXC_OFF_SYS_RESET
992 addi r7, r7, 0x100 /* next exception vector */
996 /* enable execptions from RAM vectors */
1000 ori r7,r7,MSR_ME /* Enable Machine Check */
1003 mtlr r4 /* restore link register */
1007 * Function: relocate entries for one exception vector
1010 lwz r0, 0(r7) /* hdlr ... */
1011 add r0, r0, r3 /* ... += dest_addr */
1014 lwz r0, 4(r7) /* int_return ... */
1015 add r0, r0, r3 /* ... += dest_addr */
1023 .globl enable_ext_addr
1026 lis r0, (HID0_HIGH_BAT_EN | HID0_XBSEN | HID0_XAEN)@h
1027 ori r0, r0, (HID0_HIGH_BAT_EN | HID0_XBSEN | HID0_XAEN)@l
1033 #if (CFG_CCSRBAR_DEFAULT != CFG_CCSRBAR)
1034 .globl setup_ccsrbar
1036 /* Special sequence needed to update CCSRBAR itself */
1037 lis r4, CFG_CCSRBAR_DEFAULT@h
1038 ori r4, r4, CFG_CCSRBAR_DEFAULT@l
1040 lis r5, CFG_CCSRBAR@h
1041 ori r5, r5, CFG_CCSRBAR@l
1051 lis r3, CFG_CCSRBAR@h
1052 lwz r5, CFG_CCSRBAR@l(r3)
1058 #ifdef CFG_INIT_RAM_LOCK
1060 /* Allocate Initial RAM in data cache.
1062 lis r3, (CFG_INIT_RAM_ADDR & ~31)@h
1063 ori r3, r3, (CFG_INIT_RAM_ADDR & ~31)@l
1064 li r2, ((CFG_INIT_RAM_END & ~31) + \
1065 (CFG_INIT_RAM_ADDR & 31) + 31) / 32
1072 /* Lock the data cache */
1081 /* Lock the first way of the data cache */
1084 #if defined(CONFIG_ALTIVEC)
1094 .globl unlock_ram_in_cache
1095 unlock_ram_in_cache:
1096 /* invalidate the INIT_RAM section */
1097 lis r3, (CFG_INIT_RAM_ADDR & ~31)@h
1098 ori r3, r3, (CFG_INIT_RAM_ADDR & ~31)@l
1099 li r2, ((CFG_INIT_RAM_END & ~31) + \
1100 (CFG_INIT_RAM_ADDR & 31) + 31) / 32
1105 sync /* Wait for all icbi to complete on bus */
1108 /* Unlock the data cache and invalidate it */
1120 /* Unlock the first way of the data cache */
1124 #ifdef CONFIG_ALTIVEC
1140 /* If this is a multi-cpu system then we need to handle the
1141 * 2nd cpu. The assumption is that the 2nd cpu is being
1142 * held in boot holdoff mode until the 1st cpu unlocks it
1143 * from Linux. We'll do some basic cpu init and then pass
1144 * it to the Linux Reset Vector.
1145 * Sri: Much of this initialization is not required. Linux
1146 * rewrites the bats, and the sprs and also enables the L1 cache.
1148 #if (CONFIG_NUM_CPUS > 1)
1149 .globl secondary_cpu_setup
1150 secondary_cpu_setup:
1151 /* Do only core setup on all cores except cpu0 */
1157 /* init the L2 cache */
1158 addis r3, r0, L2_INIT@h
1159 ori r3, r3, L2_INIT@l
1162 #ifdef CONFIG_ALTIVEC
1165 /* invalidate the L2 cache */
1166 bl l2cache_invalidate
1170 /* enable and invalidate the data cache */
1174 /* enable and invalidate the instruction cache*/
1185 /* MCP|SYNCBE|ABE in HID1 */
1193 lis r3, CONFIG_LINUX_RESET_VEC@h
1194 ori r3, r3, CONFIG_LINUX_RESET_VEC@l
1198 /* Never Returns, Running in Linux Now */