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.
33 #include <asm-offsets.h>
36 #include <timestamp.h>
39 #include <ppc_asm.tmpl>
42 #include <asm/cache.h>
44 #include <asm/u-boot.h>
46 #ifndef CONFIG_IDENT_STRING
47 #define CONFIG_IDENT_STRING ""
51 * Need MSR_DR | MSR_IR enabled to access I/O (printf) in exceptions
55 * Set up GOT: Global Offset Table
57 * Use r12 to access the GOT
60 GOT_ENTRY(_GOT2_TABLE_)
61 GOT_ENTRY(_FIXUP_TABLE_)
64 GOT_ENTRY(_start_of_vectors)
65 GOT_ENTRY(_end_of_vectors)
66 GOT_ENTRY(transfer_to_handler)
69 GOT_ENTRY(__bss_end__)
70 GOT_ENTRY(__bss_start)
74 * r3 - 1st arg to board_init(): IMMP pointer
75 * r4 - 2nd arg to board_init(): boot flag
78 .long 0x27051956 /* U-Boot Magic Number */
82 .ascii " (", U_BOOT_DATE, " - ", U_BOOT_TIME, ")"
83 .ascii CONFIG_IDENT_STRING, "\0"
90 /* the boot code is located below the exception table */
92 .globl _start_of_vectors
96 STD_EXCEPTION(0x200, MachineCheck, MachineCheckException)
98 /* Data Storage exception. */
99 STD_EXCEPTION(0x300, DataStorage, UnknownException)
101 /* Instruction Storage exception. */
102 STD_EXCEPTION(0x400, InstStorage, UnknownException)
104 /* External Interrupt exception. */
105 STD_EXCEPTION(0x500, ExtInterrupt, external_interrupt)
107 /* Alignment exception. */
110 EXCEPTION_PROLOG(SRR0, SRR1)
115 addi r3,r1,STACK_FRAME_OVERHEAD
116 EXC_XFER_TEMPLATE(Alignment, AlignmentException, MSR_KERNEL, COPY_EE)
118 /* Program check exception */
121 EXCEPTION_PROLOG(SRR0, SRR1)
122 addi r3,r1,STACK_FRAME_OVERHEAD
123 EXC_XFER_TEMPLATE(ProgramCheck, ProgramCheckException,
126 STD_EXCEPTION(0x800, FPUnavailable, UnknownException)
128 /* I guess we could implement decrementer, and may have
129 * to someday for timekeeping.
131 STD_EXCEPTION(0x900, Decrementer, timer_interrupt)
132 STD_EXCEPTION(0xa00, Trap_0a, UnknownException)
133 STD_EXCEPTION(0xb00, Trap_0b, UnknownException)
134 STD_EXCEPTION(0xc00, SystemCall, UnknownException)
135 STD_EXCEPTION(0xd00, SingleStep, UnknownException)
136 STD_EXCEPTION(0xe00, Trap_0e, UnknownException)
137 STD_EXCEPTION(0xf00, Trap_0f, UnknownException)
138 STD_EXCEPTION(0x1000, SoftEmu, SoftEmuException)
139 STD_EXCEPTION(0x1100, InstructionTLBMiss, UnknownException)
140 STD_EXCEPTION(0x1200, DataTLBMiss, UnknownException)
141 STD_EXCEPTION(0x1300, InstructionTLBError, UnknownException)
142 STD_EXCEPTION(0x1400, DataTLBError, UnknownException)
143 STD_EXCEPTION(0x1500, Reserved5, UnknownException)
144 STD_EXCEPTION(0x1600, Reserved6, UnknownException)
145 STD_EXCEPTION(0x1700, Reserved7, UnknownException)
146 STD_EXCEPTION(0x1800, Reserved8, UnknownException)
147 STD_EXCEPTION(0x1900, Reserved9, UnknownException)
148 STD_EXCEPTION(0x1a00, ReservedA, UnknownException)
149 STD_EXCEPTION(0x1b00, ReservedB, UnknownException)
150 STD_EXCEPTION(0x1c00, DataBreakpoint, UnknownException)
151 STD_EXCEPTION(0x1d00, InstructionBreakpoint, UnknownException)
152 STD_EXCEPTION(0x1e00, PeripheralBreakpoint, UnknownException)
153 STD_EXCEPTION(0x1f00, DevPortBreakpoint, UnknownException)
155 .globl _end_of_vectors
162 * NOTE: Only Cpu 0 will ever come here. Other cores go to an
163 * address specified by the BPTR
166 #ifdef CONFIG_SYS_RAMBOOT
167 /* disable everything */
174 /* Invalidate BATs */
177 /* Invalidate all of TLB before MMU turn on */
182 /* init the L2 cache */
184 ori r3, r3, L2_INIT@l
186 /* invalidate the L2 cache */
187 bl l2cache_invalidate
192 * Calculate absolute address in FLASH and jump there
193 *------------------------------------------------------*/
194 lis r3, CONFIG_SYS_MONITOR_BASE_EARLY@h
195 ori r3, r3, CONFIG_SYS_MONITOR_BASE_EARLY@l
196 addi r3, r3, in_flash - _start + EXC_OFF_SYS_RESET
201 /* let the C-code set up the rest */
203 /* Be careful to keep code relocatable ! */
204 /*------------------------------------------------------*/
205 /* perform low-level init */
207 /* enable extended addressing */
214 * Cache must be enabled here for stack-in-cache trick.
215 * This means we need to enable the BATS.
216 * Cache should be turned on after BATs, since by default
217 * everything is write-through.
220 /* enable address translation */
222 ori r5, r5, (MSR_IR | MSR_DR)
223 lis r3,addr_trans_enabled@h
224 ori r3, r3, addr_trans_enabled@l
230 /* enable and invalidate the data cache */
231 /* bl l1dcache_enable */
239 #ifdef CONFIG_SYS_INIT_RAM_LOCK
244 #if (CONFIG_SYS_CCSRBAR_DEFAULT != CONFIG_SYS_CCSRBAR)
248 /* set up the stack pointer in our newly created
250 lis r1, (CONFIG_SYS_INIT_RAM_ADDR + CONFIG_SYS_GBL_DATA_OFFSET)@h
251 ori r1, r1, (CONFIG_SYS_INIT_RAM_ADDR + CONFIG_SYS_GBL_DATA_OFFSET)@l
253 li r0, 0 /* Make room for stack frame header and */
254 stwu r0, -4(r1) /* clear final stack frame so that */
255 stwu r0, -4(r1) /* stack backtraces terminate cleanly */
257 GET_GOT /* initialize GOT access */
259 /* run low-level CPU init code (from Flash) */
265 /* Load PX_AUX register address in r4 */
268 /* Load contents of PX_AUX in r3 bits 24 to 31*/
271 /* Mask and obtain the bit in r3 */
272 rlwinm. r3, r3, 0, 24, 24
273 /* If not zero, jump and continue with u-boot */
276 /* Load back contents of PX_AUX in r3 bits 24 to 31 */
278 /* Set the MSB of the register value */
280 /* Write value in r3 back to PX_AUX */
283 /* Get the address to jump to in r3*/
284 lis r3, CONFIG_SYS_DIAG_ADDR@h
285 ori r3, r3, CONFIG_SYS_DIAG_ADDR@l
287 /* Load the LR with the branch address */
290 /* Branch to diagnostic */
296 /* bl l2cache_enable */
298 /* run 1st part of board init code (from Flash) */
302 /* NOTREACHED - board_init_f() does not return */
304 .globl invalidate_bats
308 /* invalidate BATs */
335 * Set up bats needed early on - this is usually the BAT for the
336 * stack-in-cache, the Flash, and CCSR space
341 lis r4, CONFIG_SYS_IBAT3L@h
342 ori r4, r4, CONFIG_SYS_IBAT3L@l
343 lis r3, CONFIG_SYS_IBAT3U@h
344 ori r3, r3, CONFIG_SYS_IBAT3U@l
350 lis r4, CONFIG_SYS_DBAT3L@h
351 ori r4, r4, CONFIG_SYS_DBAT3L@l
352 lis r3, CONFIG_SYS_DBAT3U@h
353 ori r3, r3, CONFIG_SYS_DBAT3U@l
359 lis r4, CONFIG_SYS_IBAT5L@h
360 ori r4, r4, CONFIG_SYS_IBAT5L@l
361 lis r3, CONFIG_SYS_IBAT5U@h
362 ori r3, r3, CONFIG_SYS_IBAT5U@l
368 lis r4, CONFIG_SYS_DBAT5L@h
369 ori r4, r4, CONFIG_SYS_DBAT5L@l
370 lis r3, CONFIG_SYS_DBAT5U@h
371 ori r3, r3, CONFIG_SYS_DBAT5U@l
377 lis r4, CONFIG_SYS_IBAT6L_EARLY@h
378 ori r4, r4, CONFIG_SYS_IBAT6L_EARLY@l
379 lis r3, CONFIG_SYS_IBAT6U_EARLY@h
380 ori r3, r3, CONFIG_SYS_IBAT6U_EARLY@l
386 lis r4, CONFIG_SYS_DBAT6L_EARLY@h
387 ori r4, r4, CONFIG_SYS_DBAT6L_EARLY@l
388 lis r3, CONFIG_SYS_DBAT6U_EARLY@h
389 ori r3, r3, CONFIG_SYS_DBAT6U_EARLY@l
394 #if(CONFIG_SYS_CCSRBAR_DEFAULT != CONFIG_SYS_CCSRBAR)
396 lis r4, CONFIG_SYS_CCSR_DEFAULT_IBATL@h
397 ori r4, r4, CONFIG_SYS_CCSR_DEFAULT_IBATL@l
398 lis r3, CONFIG_SYS_CCSR_DEFAULT_IBATU@h
399 ori r3, r3, CONFIG_SYS_CCSR_DEFAULT_IBATU@l
405 lis r4, CONFIG_SYS_CCSR_DEFAULT_DBATL@h
406 ori r4, r4, CONFIG_SYS_CCSR_DEFAULT_DBATL@l
407 lis r3, CONFIG_SYS_CCSR_DEFAULT_DBATU@h
408 ori r3, r3, CONFIG_SYS_CCSR_DEFAULT_DBATU@l
428 .globl disable_addr_trans
430 /* disable address translation */
433 andi. r0, r3, (MSR_IR | MSR_DR)
441 * This code finishes saving the registers to the exception frame
442 * and jumps to the appropriate handler for the exception.
443 * Register r21 is pointer into trap frame, r1 has new stack pointer.
445 .globl transfer_to_handler
456 andi. r24,r23,0x3f00 /* get vector offset */
460 mtspr SPRG2,r22 /* r1 is now kernel sp */
461 lwz r24,0(r23) /* virtual address of handler */
462 lwz r23,4(r23) /* where to go when done */
467 rfi /* jump to handler, enable MMU */
470 mfmsr r28 /* Disable interrupts */
474 SYNC /* Some chip revs need this... */
489 lwz r2,_NIP(r1) /* Restore environment */
516 * Description: Input 8 bits
525 * Description: Output 8 bits
534 * Description: Output 16 bits
543 * Description: Byte reverse and output 16 bits
552 * Description: Output 32 bits
561 * Description: Byte reverse and output 32 bits
570 * Description: Input 16 bits
579 * Description: Input 16 bits and byte reverse
588 * Description: Input 32 bits
597 * Description: Input 32 bits and byte reverse
605 * void relocate_code (addr_sp, gd, addr_moni)
607 * This "function" does not return, instead it continues in RAM
608 * after relocating the monitor code.
612 * r5 = length in bytes
618 mr r1, r3 /* Set new stack pointer */
619 mr r9, r4 /* Save copy of Global Data pointer */
620 mr r10, r5 /* Save copy of Destination Address */
623 mr r3, r5 /* Destination Address */
624 lis r4, CONFIG_SYS_MONITOR_BASE@h /* Source Address */
625 ori r4, r4, CONFIG_SYS_MONITOR_BASE@l
626 lwz r5, GOT(__init_end)
628 li r6, CONFIG_SYS_CACHELINE_SIZE /* Cache Line Size */
633 * New GOT-PTR = (old GOT-PTR - CONFIG_SYS_MONITOR_BASE) + Destination Address
639 /* First our own GOT */
641 /* then the one used by the C code */
650 beq cr1,4f /* In place copy is not necessary */
651 beq 7f /* Protect against 0 count */
669 * Now flush the cache: note that we must start from a cache aligned
670 * address. Otherwise we might miss one cache line.
674 beq 7f /* Always flush prefetch queue in any case */
682 sync /* Wait for all dcbst to complete on bus */
688 7: sync /* Wait for all icbi to complete on bus */
692 * We are done. Do not return, instead branch to second part of board
693 * initialization, now running from RAM.
695 addi r0, r10, in_ram - _start + EXC_OFF_SYS_RESET
701 * Relocation Function, r12 point to got2+0x8000
703 * Adjust got2 pointers, no need to check for 0, this code
704 * already puts a few entries in the table.
706 li r0,__got2_entries@sectoff@l
707 la r3,GOT(_GOT2_TABLE_)
708 lwz r11,GOT(_GOT2_TABLE_)
720 * Now adjust the fixups and the pointers to the fixups
721 * in case we need to move ourselves again.
723 li r0,__fixup_entries@sectoff@l
724 lwz r3,GOT(_FIXUP_TABLE_)
740 * Now clear BSS segment
742 lwz r3,GOT(__bss_start)
743 lwz r4,GOT(__bss_end__)
755 mr r3, r9 /* Init Date pointer */
756 mr r4, r10 /* Destination Address */
759 /* not reached - end relocate_code */
760 /*-----------------------------------------------------------------------*/
763 * Copy exception vector code to low memory
766 * r7: source address, r8: end address, r9: target address
770 mflr r4 /* save link register */
773 lwz r8, GOT(_end_of_vectors)
775 li r9, 0x100 /* reset vector always at 0x100 */
778 bgelr /* return if r7>=r8 - just in case */
788 * relocate `hdlr' and `int_return' entries
790 li r7, .L_MachineCheck - _start + EXC_OFF_SYS_RESET
791 li r8, Alignment - _start + EXC_OFF_SYS_RESET
794 addi r7, r7, 0x100 /* next exception vector */
798 li r7, .L_Alignment - _start + EXC_OFF_SYS_RESET
801 li r7, .L_ProgramCheck - _start + EXC_OFF_SYS_RESET
804 li r7, .L_FPUnavailable - _start + EXC_OFF_SYS_RESET
805 li r8, SystemCall - _start + EXC_OFF_SYS_RESET
808 addi r7, r7, 0x100 /* next exception vector */
812 li r7, .L_SingleStep - _start + EXC_OFF_SYS_RESET
813 li r8, _end_of_vectors - _start + EXC_OFF_SYS_RESET
816 addi r7, r7, 0x100 /* next exception vector */
820 /* enable execptions from RAM vectors */
824 ori r7,r7,MSR_ME /* Enable Machine Check */
827 mtlr r4 /* restore link register */
830 .globl enable_ext_addr
833 lis r0, (HID0_HIGH_BAT_EN | HID0_XBSEN | HID0_XAEN)@h
834 ori r0, r0, (HID0_HIGH_BAT_EN | HID0_XBSEN | HID0_XAEN)@l
840 #if (CONFIG_SYS_CCSRBAR_DEFAULT != CONFIG_SYS_CCSRBAR)
843 /* Special sequence needed to update CCSRBAR itself */
844 lis r4, CONFIG_SYS_CCSRBAR_DEFAULT@h
845 ori r4, r4, CONFIG_SYS_CCSRBAR_DEFAULT@l
847 lis r5, CONFIG_SYS_CCSRBAR_PHYS_LOW@h
848 ori r5, r5, CONFIG_SYS_CCSRBAR_PHYS_LOW@l
850 li r6, CONFIG_SYS_CCSRBAR_PHYS_HIGH@l
852 stw r5, 0(r4) /* Store physical value of CCSR */
855 lis r5, CONFIG_SYS_TEXT_BASE@h
856 ori r5,r5,CONFIG_SYS_TEXT_BASE@l
860 /* Use VA of CCSR to do read */
861 lis r3, CONFIG_SYS_CCSRBAR@h
862 lwz r5, CONFIG_SYS_CCSRBAR@l(r3)
868 #ifdef CONFIG_SYS_INIT_RAM_LOCK
870 /* Allocate Initial RAM in data cache.
872 lis r3, (CONFIG_SYS_INIT_RAM_ADDR & ~31)@h
873 ori r3, r3, (CONFIG_SYS_INIT_RAM_ADDR & ~31)@l
874 li r4, ((CONFIG_SYS_INIT_RAM_SIZE & ~31) + \
875 (CONFIG_SYS_INIT_RAM_ADDR & 31) + 31) / 32
882 /* Lock the data cache */
891 /* Lock the first way of the data cache */
894 #if defined(CONFIG_ALTIVEC)
904 .globl unlock_ram_in_cache
906 /* invalidate the INIT_RAM section */
907 lis r3, (CONFIG_SYS_INIT_RAM_ADDR & ~31)@h
908 ori r3, r3, (CONFIG_SYS_INIT_RAM_ADDR & ~31)@l
909 li r4, ((CONFIG_SYS_INIT_RAM_SIZE & ~31) + \
910 (CONFIG_SYS_INIT_RAM_ADDR & 31) + 31) / 32
915 sync /* Wait for all icbi to complete on bus */
918 /* Unlock the data cache and invalidate it */
930 /* Unlock the first way of the data cache */
934 #ifdef CONFIG_ALTIVEC