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.
84 * Subtracting _start from them lets the linker put their
85 * relative position in the executable instead of leaving
90 .word __bss_start - _start
97 /* IRQ stack memory (calculated at run-time) */
98 .globl IRQ_STACK_START
102 /* IRQ stack memory (calculated at run-time) */
103 .globl FIQ_STACK_START
108 /* IRQ stack memory (calculated at run-time) + 8 bytes */
109 .globl IRQ_STACK_START_IN
114 * the actual reset code
119 * set the cpu to SVC32 mode
127 * we do sys-critical inits only at reboot,
128 * not when booting from ram!
130 #ifndef CONFIG_SKIP_LOWLEVEL_INIT
134 #ifdef CONFIG_LPC2292
138 /* Set stackpointer in internal RAM to call board_init_f */
140 ldr sp, =(CONFIG_SYS_INIT_SP_ADDR)
141 bic sp, sp, #7 /* 8-byte alignment for ABI compliance */
145 /*------------------------------------------------------------------------------*/
148 * void relocate_code (addr_sp, gd, addr_moni)
150 * This "function" does not return, instead it continues in RAM
151 * after relocating the monitor code.
156 mov r4, r0 /* save addr_sp */
157 mov r5, r1 /* save addr of gd */
158 mov r6, r2 /* save addr of destination */
160 /* Set up the stack */
166 beq clear_bss /* skip relocation */
167 mov r1, r6 /* r1 <- scratch for copy_loop */
168 ldr r3, _bss_start_ofs
169 add r2, r0, r3 /* r2 <- source end address */
172 ldmia r0!, {r9-r10} /* copy from source address [r0] */
173 stmia r1!, {r9-r10} /* copy to target address [r1] */
174 cmp r0, r2 /* until source end address [r2] */
177 #ifndef CONFIG_PRELOADER
179 * fix .rel.dyn relocations
181 ldr r0, _TEXT_BASE /* r0 <- Text base */
182 sub r9, r6, r0 /* r9 <- relocation offset */
183 ldr r10, _dynsym_start_ofs /* r10 <- sym table ofs */
184 add r10, r10, r0 /* r10 <- sym table in FLASH */
185 ldr r2, _rel_dyn_start_ofs /* r2 <- rel dyn start ofs */
186 add r2, r2, r0 /* r2 <- rel dyn start in FLASH */
187 ldr r3, _rel_dyn_end_ofs /* r3 <- rel dyn end ofs */
188 add r3, r3, r0 /* r3 <- rel dyn end in FLASH */
190 ldr r0, [r2] /* r0 <- location to fix up, IN FLASH! */
191 add r0, r0, r9 /* r0 <- location to fix up in RAM */
194 cmp r7, #23 /* relative fixup? */
196 cmp r7, #2 /* absolute fixup? */
198 /* ignore unknown type of fixup */
201 /* absolute fix: set location to (offset) symbol value */
202 mov r1, r1, LSR #4 /* r1 <- symbol index in .dynsym */
203 add r1, r10, r1 /* r1 <- address of symbol in table */
204 ldr r1, [r1, #4] /* r1 <- symbol value */
205 add r1, r1, r9 /* r1 <- relocated sym addr */
208 /* relative fix: increase location by offset */
213 add r2, r2, #8 /* each rel.dyn entry is 8 bytes */
219 #ifndef CONFIG_PRELOADER
220 ldr r0, _bss_start_ofs
222 mov r4, r6 /* reloc addr */
225 mov r2, #0x00000000 /* clear */
227 clbss_l:str r2, [r0] /* clear loop... */
237 * We are done. Do not return, instead branch to second part of board
238 * initialization, now running from RAM.
240 ldr r0, _board_init_r_ofs
244 /* setup parameters for board_init_r */
245 mov r0, r5 /* gd_t */
246 mov r1, r6 /* dest_addr */
251 .word board_init_r - _start
254 .word __rel_dyn_start - _start
256 .word __rel_dyn_end - _start
258 .word __dynsym_start - _start
261 *************************************************************************
263 * CPU_init_critical registers
265 * setup important registers
266 * setup memory timing
268 *************************************************************************
271 #if defined(CONFIG_IMPA7) || defined(CONFIG_EP7312) || defined(CONFIG_ARMADILLO)
273 /* Interupt-Controller base addresses */
274 INTMR1: .word 0x80000280 @ 32 bit size
275 INTMR2: .word 0x80001280 @ 16 bit size
276 INTMR3: .word 0x80002280 @ 8 bit size
279 SYSCON1: .word 0x80000100
280 SYSCON2: .word 0x80001100
281 SYSCON3: .word 0x80002200
283 #define CLKCTL 0x6 /* mask */
284 #define CLKCTL_18 0x0 /* 18.432 MHz */
285 #define CLKCTL_36 0x2 /* 36.864 MHz */
286 #define CLKCTL_49 0x4 /* 49.152 MHz */
287 #define CLKCTL_73 0x6 /* 73.728 MHz */
289 #elif defined(CONFIG_LPC2292)
290 PLLCFG_ADR: .word PLLCFG
291 PLLFEED_ADR: .word PLLFEED
292 PLLCON_ADR: .word PLLCON
293 PLLSTAT_ADR: .word PLLSTAT
294 VPBDIV_ADR: .word VPBDIV
295 MEMMAP_ADR: .word MEMMAP
300 #if defined(CONFIG_IMPA7) || defined(CONFIG_EP7312) || defined(CONFIG_ARMADILLO)
303 * mask all IRQs by clearing all bits in the INTMRs
314 * flush v4 I/D caches
317 mcr p15, 0, r0, c7, c7, 0 /* flush v3/v4 cache */
318 mcr p15, 0, r0, c8, c7, 0 /* flush v4 TLB */
321 * disable MMU stuff and caches
324 bic r0, r0, #0x00002300 @ clear bits 13, 9:8 (--V- --RS)
325 bic r0, r0, #0x0000008f @ clear bits 7, 3:0 (B--- WCAM)
326 orr r0, r0, #0x00000002 @ set bit 2 (A) Align
328 #elif defined(CONFIG_NETARM)
330 * prior to software reset : need to set pin PORTC4 to be *HRESET
332 ldr r0, =NETARM_GEN_MODULE_BASE
333 ldr r1, =(NETARM_GEN_PORT_MODE(0x10) | \
334 NETARM_GEN_PORT_DIR(0x10))
335 str r1, [r0, #+NETARM_GEN_PORTC]
337 * software reset : see HW Ref. Guide 8.2.4 : Software Service register
338 * for an explanation of this process
340 ldr r0, =NETARM_GEN_MODULE_BASE
341 ldr r1, =NETARM_GEN_SW_SVC_RESETA
342 str r1, [r0, #+NETARM_GEN_SOFTWARE_SERVICE]
343 ldr r1, =NETARM_GEN_SW_SVC_RESETB
344 str r1, [r0, #+NETARM_GEN_SOFTWARE_SERVICE]
345 ldr r1, =NETARM_GEN_SW_SVC_RESETA
346 str r1, [r0, #+NETARM_GEN_SOFTWARE_SERVICE]
347 ldr r1, =NETARM_GEN_SW_SVC_RESETB
348 str r1, [r0, #+NETARM_GEN_SOFTWARE_SERVICE]
350 * setup PLL and System Config
352 ldr r0, =NETARM_GEN_MODULE_BASE
354 ldr r1, =( NETARM_GEN_SYS_CFG_LENDIAN | \
355 NETARM_GEN_SYS_CFG_BUSFULL | \
356 NETARM_GEN_SYS_CFG_USER_EN | \
357 NETARM_GEN_SYS_CFG_ALIGN_ABORT | \
358 NETARM_GEN_SYS_CFG_BUSARB_INT | \
359 NETARM_GEN_SYS_CFG_BUSMON_EN )
361 str r1, [r0, #+NETARM_GEN_SYSTEM_CONTROL]
363 #ifndef CONFIG_NETARM_PLL_BYPASS
364 ldr r1, =( NETARM_GEN_PLL_CTL_PLLCNT(NETARM_PLL_COUNT_VAL) | \
365 NETARM_GEN_PLL_CTL_POLTST_DEF | \
366 NETARM_GEN_PLL_CTL_INDIV(1) | \
367 NETARM_GEN_PLL_CTL_ICP_DEF | \
368 NETARM_GEN_PLL_CTL_OUTDIV(2) )
369 str r1, [r0, #+NETARM_GEN_PLL_CONTROL]
373 * mask all IRQs by clearing all bits in the INTMRs
376 ldr r0, =NETARM_GEN_MODULE_BASE
377 str r1, [r0, #+NETARM_GEN_INTR_ENABLE]
379 #elif defined(CONFIG_S3C4510B)
382 * Mask off all IRQ sources
392 ldr r1, =0x83ffffa0 /* cache-disabled */
395 #elif defined(CONFIG_INTEGRATOR) && defined(CONFIG_ARCH_INTEGRATOR)
396 /* No specific initialisation for IntegratorAP/CM720T as yet */
397 #elif defined(CONFIG_LPC2292)
401 /* First disconnect and disable the PLL */
405 ldr r0, PLLFEED_ADR /* start feed sequence */
407 str r4, [r0] /* feed sequence done */
408 /* Set new M and P values */
410 mov r1, #0x23 /* M=4 and P=2 */
412 ldr r0, PLLFEED_ADR /* start feed sequence */
414 str r4, [r0] /* feed sequence done */
415 /* Then enable the PLL */
417 mov r1, #0x01 /* PLL enable bit */
419 ldr r0, PLLFEED_ADR /* start feed sequence */
421 str r4, [r0] /* feed sequence done */
422 /* Wait for the lock */
424 mov r1, #0x400 /* lock bit */
430 /* And finally connect the PLL */
432 mov r1, #0x03 /* PLL enable bit and connect bit */
434 ldr r0, PLLFEED_ADR /* start feed sequence */
436 str r4, [r0] /* feed sequence done */
437 /* Set-up VPBDIV register */
439 mov r1, #0x01 /* VPB clock is same as process clock */
442 #error No cpu_init_crit() defined for current CPU type
445 #ifdef CONFIG_ARM7_REVD
446 /* set clock speed */
447 /* !!! we run @ 36 MHz due to a hardware flaw in Rev. D processors */
448 /* !!! not doing DRAM refresh properly! */
452 orr r1, r1, #CLKCTL_36
456 #ifndef CONFIG_LPC2292
459 * before relocating, we have to setup RAM timing
460 * because memory timing is board-dependent, you will
461 * find a lowlevel_init.S in your board directory.
471 *************************************************************************
475 *************************************************************************
481 #define S_FRAME_SIZE 72
503 #define MODE_SVC 0x13
507 * use bad_save_user_regs for abort/prefetch/undef/swi ...
508 * use irq_save_user_regs / irq_restore_user_regs for IRQ/FIQ handling
511 .macro bad_save_user_regs
512 sub sp, sp, #S_FRAME_SIZE
513 stmia sp, {r0 - r12} @ Calling r0-r12
516 ldr r2, IRQ_STACK_START_IN
517 ldmia r2, {r2 - r4} @ get pc, cpsr, old_r0
518 add r0, sp, #S_FRAME_SIZE @ restore sp_SVC
522 stmia r5, {r0 - r4} @ save sp_SVC, lr_SVC, pc, cpsr, old_r
526 .macro irq_save_user_regs
527 sub sp, sp, #S_FRAME_SIZE
528 stmia sp, {r0 - r12} @ Calling r0-r12
530 stmdb r8, {sp, lr}^ @ Calling SP, LR
531 str lr, [r8, #0] @ Save calling PC
533 str r6, [r8, #4] @ Save CPSR
534 str r0, [r8, #8] @ Save OLD_R0
538 .macro irq_restore_user_regs
539 ldmia sp, {r0 - lr}^ @ Calling r0 - lr
541 ldr lr, [sp, #S_PC] @ Get PC
542 add sp, sp, #S_FRAME_SIZE
543 subs pc, lr, #4 @ return & move spsr_svc into cpsr
547 ldr r13, IRQ_STACK_START_IN @ setup our mode stack
549 str lr, [r13] @ save caller lr / spsr
553 mov r13, #MODE_SVC @ prepare SVC-Mode
559 .macro get_irq_stack @ setup IRQ stack
560 ldr sp, IRQ_STACK_START
563 .macro get_fiq_stack @ setup FIQ stack
564 ldr sp, FIQ_STACK_START
571 undefined_instruction:
574 bl do_undefined_instruction
580 bl do_software_interrupt
600 #ifdef CONFIG_USE_IRQ
607 irq_restore_user_regs
612 /* someone ought to write a more effiction fiq_save_user_regs */
615 irq_restore_user_regs
633 #if defined(CONFIG_IMPA7) || defined(CONFIG_EP7312) || defined(CONFIG_ARMADILLO)
638 mcr p15, 0, ip, c7, c7, 0 @ invalidate cache
639 mcr p15, 0, ip, c8, c7, 0 @ flush TLB (v4)
640 mrc p15, 0, ip, c1, c0, 0 @ get ctrl register
641 bic ip, ip, #0x000f @ ............wcam
642 bic ip, ip, #0x2100 @ ..v....s........
643 mcr p15, 0, ip, c1, c0, 0 @ ctrl register
645 #elif defined(CONFIG_NETARM)
649 ldr r1, =NETARM_MEM_MODULE_BASE
650 ldr r0, [r1, #+NETARM_MEM_CS0_BASE_ADDR]
653 ldr r1, =(relocate-CONFIG_SYS_TEXT_BASE)
655 ldr r4, =NETARM_GEN_MODULE_BASE
656 ldr r1, =NETARM_GEN_SW_SVC_RESETA
657 str r1, [r4, #+NETARM_GEN_SOFTWARE_SERVICE]
658 ldr r1, =NETARM_GEN_SW_SVC_RESETB
659 str r1, [r4, #+NETARM_GEN_SOFTWARE_SERVICE]
660 ldr r1, =NETARM_GEN_SW_SVC_RESETA
661 str r1, [r4, #+NETARM_GEN_SOFTWARE_SERVICE]
662 ldr r1, =NETARM_GEN_SW_SVC_RESETB
663 str r1, [r4, #+NETARM_GEN_SOFTWARE_SERVICE]
665 #elif defined(CONFIG_S3C4510B)
666 /* Nothing done here as reseting the CPU is board specific, depending
667 * on external peripherals such as watchdog timers, etc. */
668 #elif defined(CONFIG_INTEGRATOR) && defined(CONFIG_ARCH_INTEGRATOR)
669 /* No specific reset actions for IntegratorAP/CM720T as yet */
670 #elif defined(CONFIG_LPC2292)
676 #error No reset_cpu() defined for current CPU type