2 * armboot - Startup Code for ARM720 CPU-core
4 * Copyright (c) 2001 Marius Gröger <mag@sysgo.de>
5 * Copyright (c) 2002 Alex Züpke <azu@sysgo.de>
7 * See file CREDITS for list of people who contributed to this
10 * This program is free software; you can redistribute it and/or
11 * modify it under the terms of the GNU General Public License as
12 * published by the Free Software Foundation; either version 2 of
13 * the License, or (at your option) any later version.
15 * This program is distributed in the hope that it will be useful,
16 * but WITHOUT ANY WARRANTY; without even the implied warranty of
17 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
18 * GNU General Public License for more details.
20 * You should have received a copy of the GNU General Public License
21 * along with this program; if not, write to the Free Software
22 * Foundation, Inc., 59 Temple Place, Suite 330, Boston,
26 #include <asm-offsets.h>
29 #include <asm/hardware.h>
32 *************************************************************************
34 * Jump vector table as in table 3.1 in [1]
36 *************************************************************************
42 ldr pc, _undefined_instruction
43 ldr pc, _software_interrupt
44 ldr pc, _prefetch_abort
47 .word 0xB4405F76 /* 2's complement of the checksum of the vectors */
54 _undefined_instruction: .word undefined_instruction
55 _software_interrupt: .word software_interrupt
56 _prefetch_abort: .word prefetch_abort
57 _data_abort: .word data_abort
58 _not_used: .word not_used
62 .balignl 16,0xdeadbeef
66 *************************************************************************
68 * Startup Code (reset vector)
70 * do important init only if we don't start from RAM!
71 * relocate armboot to ram
73 * jump to second stage
75 *************************************************************************
80 .word CONFIG_SYS_TEXT_BASE
83 * These are defined in the board-specific linker script.
94 /* IRQ stack memory (calculated at run-time) */
95 .globl IRQ_STACK_START
99 /* IRQ stack memory (calculated at run-time) */
100 .globl FIQ_STACK_START
105 /* IRQ stack memory (calculated at run-time) + 8 bytes */
106 .globl IRQ_STACK_START_IN
110 .globl _datarel_start
112 .word __datarel_start
114 .globl _datarelrolocal_start
115 _datarelrolocal_start:
116 .word __datarelrolocal_start
118 .globl _datarellocal_start
120 .word __datarellocal_start
122 .globl _datarelro_start
124 .word __datarelro_start
135 * the actual reset code
140 * set the cpu to SVC32 mode
148 * we do sys-critical inits only at reboot,
149 * not when booting from ram!
151 #ifndef CONFIG_SKIP_LOWLEVEL_INIT
155 #ifdef CONFIG_LPC2292
159 /* Set stackpointer in internal RAM to call board_init_f */
161 ldr sp, =(CONFIG_SYS_INIT_SP_ADDR)
165 /*------------------------------------------------------------------------------*/
168 * void relocate_code (addr_sp, gd, addr_moni)
170 * This "function" does not return, instead it continues in RAM
171 * after relocating the monitor code.
176 mov r4, r0 /* save addr_sp */
177 mov r5, r1 /* save addr of gd */
178 mov r6, r2 /* save addr of destination */
179 mov r7, r2 /* save addr of destination */
181 /* Set up the stack */
188 sub r2, r3, r2 /* r2 <- size of armboot */
189 add r2, r0, r2 /* r2 <- source end address */
194 ldmia r0!, {r9-r10} /* copy from source address [r0] */
195 stmia r6!, {r9-r10} /* copy to target address [r1] */
196 cmp r0, r2 /* until source end address [r2] */
199 #ifndef CONFIG_PRELOADER
200 /* fix got entries */
201 ldr r1, _TEXT_BASE /* Text base */
202 mov r0, r7 /* reloc addr */
203 ldr r2, _got_start /* addr in Flash */
204 ldr r3, _got_end /* addr in Flash */
221 #ifndef CONFIG_PRELOADER
224 ldr r3, _TEXT_BASE /* Text base */
225 mov r4, r7 /* reloc addr */
230 mov r2, #0x00000000 /* clear */
232 clbss_l:str r2, [r0] /* clear loop... */
242 * We are done. Do not return, instead branch to second part of board
243 * initialization, now running from RAM.
246 ldr r2, _board_init_r
248 add r2, r2, r7 /* position from board_init_r in RAM */
249 /* setup parameters for board_init_r */
250 mov r0, r5 /* gd_t */
251 mov r1, r7 /* dest_addr */
256 _board_init_r: .word board_init_r
259 *************************************************************************
261 * CPU_init_critical registers
263 * setup important registers
264 * setup memory timing
266 *************************************************************************
269 #if defined(CONFIG_IMPA7) || defined(CONFIG_EP7312) || defined(CONFIG_ARMADILLO)
271 /* Interupt-Controller base addresses */
272 INTMR1: .word 0x80000280 @ 32 bit size
273 INTMR2: .word 0x80001280 @ 16 bit size
274 INTMR3: .word 0x80002280 @ 8 bit size
277 SYSCON1: .word 0x80000100
278 SYSCON2: .word 0x80001100
279 SYSCON3: .word 0x80002200
281 #define CLKCTL 0x6 /* mask */
282 #define CLKCTL_18 0x0 /* 18.432 MHz */
283 #define CLKCTL_36 0x2 /* 36.864 MHz */
284 #define CLKCTL_49 0x4 /* 49.152 MHz */
285 #define CLKCTL_73 0x6 /* 73.728 MHz */
287 #elif defined(CONFIG_LPC2292)
288 PLLCFG_ADR: .word PLLCFG
289 PLLFEED_ADR: .word PLLFEED
290 PLLCON_ADR: .word PLLCON
291 PLLSTAT_ADR: .word PLLSTAT
292 VPBDIV_ADR: .word VPBDIV
293 MEMMAP_ADR: .word MEMMAP
298 #if defined(CONFIG_IMPA7) || defined(CONFIG_EP7312) || defined(CONFIG_ARMADILLO)
301 * mask all IRQs by clearing all bits in the INTMRs
312 * flush v4 I/D caches
315 mcr p15, 0, r0, c7, c7, 0 /* flush v3/v4 cache */
316 mcr p15, 0, r0, c8, c7, 0 /* flush v4 TLB */
319 * disable MMU stuff and caches
322 bic r0, r0, #0x00002300 @ clear bits 13, 9:8 (--V- --RS)
323 bic r0, r0, #0x0000008f @ clear bits 7, 3:0 (B--- WCAM)
324 orr r0, r0, #0x00000002 @ set bit 2 (A) Align
326 #elif defined(CONFIG_NETARM)
328 * prior to software reset : need to set pin PORTC4 to be *HRESET
330 ldr r0, =NETARM_GEN_MODULE_BASE
331 ldr r1, =(NETARM_GEN_PORT_MODE(0x10) | \
332 NETARM_GEN_PORT_DIR(0x10))
333 str r1, [r0, #+NETARM_GEN_PORTC]
335 * software reset : see HW Ref. Guide 8.2.4 : Software Service register
336 * for an explanation of this process
338 ldr r0, =NETARM_GEN_MODULE_BASE
339 ldr r1, =NETARM_GEN_SW_SVC_RESETA
340 str r1, [r0, #+NETARM_GEN_SOFTWARE_SERVICE]
341 ldr r1, =NETARM_GEN_SW_SVC_RESETB
342 str r1, [r0, #+NETARM_GEN_SOFTWARE_SERVICE]
343 ldr r1, =NETARM_GEN_SW_SVC_RESETA
344 str r1, [r0, #+NETARM_GEN_SOFTWARE_SERVICE]
345 ldr r1, =NETARM_GEN_SW_SVC_RESETB
346 str r1, [r0, #+NETARM_GEN_SOFTWARE_SERVICE]
348 * setup PLL and System Config
350 ldr r0, =NETARM_GEN_MODULE_BASE
352 ldr r1, =( NETARM_GEN_SYS_CFG_LENDIAN | \
353 NETARM_GEN_SYS_CFG_BUSFULL | \
354 NETARM_GEN_SYS_CFG_USER_EN | \
355 NETARM_GEN_SYS_CFG_ALIGN_ABORT | \
356 NETARM_GEN_SYS_CFG_BUSARB_INT | \
357 NETARM_GEN_SYS_CFG_BUSMON_EN )
359 str r1, [r0, #+NETARM_GEN_SYSTEM_CONTROL]
361 #ifndef CONFIG_NETARM_PLL_BYPASS
362 ldr r1, =( NETARM_GEN_PLL_CTL_PLLCNT(NETARM_PLL_COUNT_VAL) | \
363 NETARM_GEN_PLL_CTL_POLTST_DEF | \
364 NETARM_GEN_PLL_CTL_INDIV(1) | \
365 NETARM_GEN_PLL_CTL_ICP_DEF | \
366 NETARM_GEN_PLL_CTL_OUTDIV(2) )
367 str r1, [r0, #+NETARM_GEN_PLL_CONTROL]
371 * mask all IRQs by clearing all bits in the INTMRs
374 ldr r0, =NETARM_GEN_MODULE_BASE
375 str r1, [r0, #+NETARM_GEN_INTR_ENABLE]
377 #elif defined(CONFIG_S3C4510B)
380 * Mask off all IRQ sources
390 ldr r1, =0x83ffffa0 /* cache-disabled */
393 #elif defined(CONFIG_INTEGRATOR) && defined(CONFIG_ARCH_INTEGRATOR)
394 /* No specific initialisation for IntegratorAP/CM720T as yet */
395 #elif defined(CONFIG_LPC2292)
399 /* First disconnect and disable the PLL */
403 ldr r0, PLLFEED_ADR /* start feed sequence */
405 str r4, [r0] /* feed sequence done */
406 /* Set new M and P values */
408 mov r1, #0x23 /* M=4 and P=2 */
410 ldr r0, PLLFEED_ADR /* start feed sequence */
412 str r4, [r0] /* feed sequence done */
413 /* Then enable the PLL */
415 mov r1, #0x01 /* PLL enable bit */
417 ldr r0, PLLFEED_ADR /* start feed sequence */
419 str r4, [r0] /* feed sequence done */
420 /* Wait for the lock */
422 mov r1, #0x400 /* lock bit */
428 /* And finally connect the PLL */
430 mov r1, #0x03 /* PLL enable bit and connect bit */
432 ldr r0, PLLFEED_ADR /* start feed sequence */
434 str r4, [r0] /* feed sequence done */
435 /* Set-up VPBDIV register */
437 mov r1, #0x01 /* VPB clock is same as process clock */
440 #error No cpu_init_crit() defined for current CPU type
443 #ifdef CONFIG_ARM7_REVD
444 /* set clock speed */
445 /* !!! we run @ 36 MHz due to a hardware flaw in Rev. D processors */
446 /* !!! not doing DRAM refresh properly! */
450 orr r1, r1, #CLKCTL_36
454 #ifndef CONFIG_LPC2292
457 * before relocating, we have to setup RAM timing
458 * because memory timing is board-dependent, you will
459 * find a lowlevel_init.S in your board directory.
469 *************************************************************************
473 *************************************************************************
479 #define S_FRAME_SIZE 72
501 #define MODE_SVC 0x13
505 * use bad_save_user_regs for abort/prefetch/undef/swi ...
506 * use irq_save_user_regs / irq_restore_user_regs for IRQ/FIQ handling
509 .macro bad_save_user_regs
510 sub sp, sp, #S_FRAME_SIZE
511 stmia sp, {r0 - r12} @ Calling r0-r12
514 ldr r2, IRQ_STACK_START_IN
515 ldmia r2, {r2 - r4} @ get pc, cpsr, old_r0
516 add r0, sp, #S_FRAME_SIZE @ restore sp_SVC
520 stmia r5, {r0 - r4} @ save sp_SVC, lr_SVC, pc, cpsr, old_r
524 .macro irq_save_user_regs
525 sub sp, sp, #S_FRAME_SIZE
526 stmia sp, {r0 - r12} @ Calling r0-r12
528 stmdb r8, {sp, lr}^ @ Calling SP, LR
529 str lr, [r8, #0] @ Save calling PC
531 str r6, [r8, #4] @ Save CPSR
532 str r0, [r8, #8] @ Save OLD_R0
536 .macro irq_restore_user_regs
537 ldmia sp, {r0 - lr}^ @ Calling r0 - lr
539 ldr lr, [sp, #S_PC] @ Get PC
540 add sp, sp, #S_FRAME_SIZE
541 subs pc, lr, #4 @ return & move spsr_svc into cpsr
545 ldr r13, IRQ_STACK_START_IN @ setup our mode stack
547 str lr, [r13] @ save caller lr / spsr
551 mov r13, #MODE_SVC @ prepare SVC-Mode
557 .macro get_irq_stack @ setup IRQ stack
558 ldr sp, IRQ_STACK_START
561 .macro get_fiq_stack @ setup FIQ stack
562 ldr sp, FIQ_STACK_START
569 undefined_instruction:
572 bl do_undefined_instruction
578 bl do_software_interrupt
598 #ifdef CONFIG_USE_IRQ
605 irq_restore_user_regs
610 /* someone ought to write a more effiction fiq_save_user_regs */
613 irq_restore_user_regs
631 #if defined(CONFIG_IMPA7) || defined(CONFIG_EP7312) || defined(CONFIG_ARMADILLO)
636 mcr p15, 0, ip, c7, c7, 0 @ invalidate cache
637 mcr p15, 0, ip, c8, c7, 0 @ flush TLB (v4)
638 mrc p15, 0, ip, c1, c0, 0 @ get ctrl register
639 bic ip, ip, #0x000f @ ............wcam
640 bic ip, ip, #0x2100 @ ..v....s........
641 mcr p15, 0, ip, c1, c0, 0 @ ctrl register
643 #elif defined(CONFIG_NETARM)
647 ldr r1, =NETARM_MEM_MODULE_BASE
648 ldr r0, [r1, #+NETARM_MEM_CS0_BASE_ADDR]
651 ldr r1, =(relocate-CONFIG_SYS_TEXT_BASE)
653 ldr r4, =NETARM_GEN_MODULE_BASE
654 ldr r1, =NETARM_GEN_SW_SVC_RESETA
655 str r1, [r4, #+NETARM_GEN_SOFTWARE_SERVICE]
656 ldr r1, =NETARM_GEN_SW_SVC_RESETB
657 str r1, [r4, #+NETARM_GEN_SOFTWARE_SERVICE]
658 ldr r1, =NETARM_GEN_SW_SVC_RESETA
659 str r1, [r4, #+NETARM_GEN_SOFTWARE_SERVICE]
660 ldr r1, =NETARM_GEN_SW_SVC_RESETB
661 str r1, [r4, #+NETARM_GEN_SOFTWARE_SERVICE]
663 #elif defined(CONFIG_S3C4510B)
664 /* Nothing done here as reseting the CPU is board specific, depending
665 * on external peripherals such as watchdog timers, etc. */
666 #elif defined(CONFIG_INTEGRATOR) && defined(CONFIG_ARCH_INTEGRATOR)
667 /* No specific reset actions for IntegratorAP/CM720T as yet */
668 #elif defined(CONFIG_LPC2292)
674 #error No reset_cpu() defined for current CPU type