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2d5b561e WD |
1 | /* vi: set ts=8 sw=8 noet: */ |
2 | /* | |
3 | * u-boot - Startup Code for XScale IXP | |
4 | * | |
5 | * Copyright (C) 2003 Kyle Harris <kharris@nexus-tech.net> | |
6 | * | |
7 | * Based on startup code example contained in the | |
8 | * Intel IXP4xx Programmer's Guide and past u-boot Start.S | |
9 | * samples. | |
10 | * | |
11 | * See file CREDITS for list of people who contributed to this | |
12 | * project. | |
13 | * | |
14 | * This program is free software; you can redistribute it and/or | |
15 | * modify it under the terms of the GNU General Public License as | |
16 | * published by the Free Software Foundation; either version 2 of | |
17 | * the License, or (at your option) any later version. | |
18 | * | |
19 | * This program is distributed in the hope that it will be useful, | |
20 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
21 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
22 | * GNU General Public License for more details. | |
23 | * | |
24 | * You should have received a copy of the GNU General Public License | |
25 | * along with this program; if not, write to the Free Software | |
26 | * Foundation, Inc., 59 Temple Place, Suite 330, Boston, | |
27 | * MA 02111-1307 USA | |
28 | */ | |
29 | ||
25ddd1fb | 30 | #include <asm-offsets.h> |
2d5b561e WD |
31 | #include <config.h> |
32 | #include <version.h> | |
33 | #include <asm/arch/ixp425.h> | |
34 | ||
42d1f039 WD |
35 | #define MMU_Control_M 0x001 /* Enable MMU */ |
36 | #define MMU_Control_A 0x002 /* Enable address alignment faults */ | |
37 | #define MMU_Control_C 0x004 /* Enable cache */ | |
38 | #define MMU_Control_W 0x008 /* Enable write-buffer */ | |
39 | #define MMU_Control_P 0x010 /* Compatability: 32 bit code */ | |
40 | #define MMU_Control_D 0x020 /* Compatability: 32 bit data */ | |
41 | #define MMU_Control_L 0x040 /* Compatability: */ | |
42 | #define MMU_Control_B 0x080 /* Enable Big-Endian */ | |
43 | #define MMU_Control_S 0x100 /* Enable system protection */ | |
44 | #define MMU_Control_R 0x200 /* Enable ROM protection */ | |
45 | #define MMU_Control_I 0x1000 /* Enable Instruction cache */ | |
46 | #define MMU_Control_X 0x2000 /* Set interrupt vectors at 0xFFFF0000 */ | |
2d5b561e WD |
47 | #define MMU_Control_Init (MMU_Control_P|MMU_Control_D|MMU_Control_L) |
48 | ||
49 | ||
50 | /* | |
51 | * Macro definitions | |
52 | */ | |
42d1f039 WD |
53 | /* Delay a bit */ |
54 | .macro DELAY_FOR cycles, reg0 | |
55 | ldr \reg0, =\cycles | |
56 | subs \reg0, \reg0, #1 | |
57 | subne pc, pc, #0xc | |
58 | .endm | |
59 | ||
60 | /* wait for coprocessor write complete */ | |
61 | .macro CPWAIT reg | |
62 | mrc p15,0,\reg,c2,c0,0 | |
63 | mov \reg,\reg | |
64 | sub pc,pc,#4 | |
65 | .endm | |
2d5b561e WD |
66 | |
67 | .globl _start | |
ce04bb41 MS |
68 | _start: |
69 | ldr pc, _reset | |
2d5b561e WD |
70 | ldr pc, _undefined_instruction |
71 | ldr pc, _software_interrupt | |
72 | ldr pc, _prefetch_abort | |
73 | ldr pc, _data_abort | |
74 | ldr pc, _not_used | |
75 | ldr pc, _irq | |
76 | ldr pc, _fiq | |
77 | ||
ce04bb41 | 78 | _reset: .word reset |
2d5b561e WD |
79 | _undefined_instruction: .word undefined_instruction |
80 | _software_interrupt: .word software_interrupt | |
81 | _prefetch_abort: .word prefetch_abort | |
82 | _data_abort: .word data_abort | |
83 | _not_used: .word not_used | |
84 | _irq: .word irq | |
85 | _fiq: .word fiq | |
86 | ||
87 | .balignl 16,0xdeadbeef | |
88 | ||
89 | ||
90 | /* | |
91 | * Startup Code (reset vector) | |
92 | * | |
93 | * do important init only if we don't start from memory! | |
94 | * - relocate armboot to ram | |
95 | * - setup stack | |
96 | * - jump to second stage | |
97 | */ | |
98 | ||
2af0a099 | 99 | .globl _TEXT_BASE |
2d5b561e | 100 | _TEXT_BASE: |
14d0a02a | 101 | .word CONFIG_SYS_TEXT_BASE |
2d5b561e | 102 | |
2d5b561e | 103 | /* |
f6e20fc6 | 104 | * These are defined in the board-specific linker script. |
3336ca60 AA |
105 | * Subtracting _start from them lets the linker put their |
106 | * relative position in the executable instead of leaving | |
107 | * them null. | |
2d5b561e | 108 | */ |
3336ca60 AA |
109 | .globl _bss_start_ofs |
110 | _bss_start_ofs: | |
111 | .word __bss_start - _start | |
2d5b561e | 112 | |
3336ca60 AA |
113 | .globl _bss_end_ofs |
114 | _bss_end_ofs: | |
44c6e659 | 115 | .word __bss_end__ - _start |
2d5b561e | 116 | |
f326cbba PYC |
117 | .globl _end_ofs |
118 | _end_ofs: | |
119 | .word _end - _start | |
120 | ||
2d5b561e WD |
121 | #ifdef CONFIG_USE_IRQ |
122 | /* IRQ stack memory (calculated at run-time) */ | |
123 | .globl IRQ_STACK_START | |
124 | IRQ_STACK_START: | |
125 | .word 0x0badc0de | |
126 | ||
127 | /* IRQ stack memory (calculated at run-time) */ | |
128 | .globl FIQ_STACK_START | |
129 | FIQ_STACK_START: | |
130 | .word 0x0badc0de | |
131 | #endif | |
132 | ||
2af0a099 HS |
133 | /* IRQ stack memory (calculated at run-time) + 8 bytes */ |
134 | .globl IRQ_STACK_START_IN | |
135 | IRQ_STACK_START_IN: | |
136 | .word 0x0badc0de | |
137 | ||
2af0a099 HS |
138 | /* |
139 | * the actual reset code | |
140 | */ | |
141 | ||
142 | reset: | |
143 | /* disable mmu, set big-endian */ | |
144 | mov r0, #0xf8 | |
145 | mcr p15, 0, r0, c1, c0, 0 | |
146 | CPWAIT r0 | |
147 | ||
148 | /* invalidate I & D caches & BTB */ | |
149 | mcr p15, 0, r0, c7, c7, 0 | |
150 | CPWAIT r0 | |
151 | ||
152 | /* invalidate I & Data TLB */ | |
153 | mcr p15, 0, r0, c8, c7, 0 | |
154 | CPWAIT r0 | |
155 | ||
156 | /* drain write and fill buffers */ | |
157 | mcr p15, 0, r0, c7, c10, 4 | |
158 | CPWAIT r0 | |
159 | ||
160 | /* disable write buffer coalescing */ | |
161 | mrc p15, 0, r0, c1, c0, 1 | |
162 | orr r0, r0, #1 | |
163 | mcr p15, 0, r0, c1, c0, 1 | |
164 | CPWAIT r0 | |
165 | ||
166 | /* set EXP CS0 to the optimum timing */ | |
167 | ldr r1, =CONFIG_SYS_EXP_CS0 | |
168 | ldr r2, =IXP425_EXP_CS0 | |
169 | str r1, [r2] | |
170 | ||
171 | /* make sure flash is visible at 0 */ | |
2af0a099 HS |
172 | mov r1, #CONFIG_SYS_SDR_CONFIG |
173 | ldr r2, =IXP425_SDR_CONFIG | |
174 | str r1, [r2] | |
175 | ||
176 | /* disable refresh cycles */ | |
177 | mov r1, #0 | |
178 | ldr r3, =IXP425_SDR_REFRESH | |
179 | str r1, [r3] | |
180 | ||
181 | /* send nop command */ | |
182 | mov r1, #3 | |
183 | ldr r4, =IXP425_SDR_IR | |
184 | str r1, [r4] | |
185 | DELAY_FOR 0x4000, r0 | |
186 | ||
187 | /* set SDRAM internal refresh val */ | |
188 | ldr r1, =CONFIG_SYS_SDRAM_REFRESH_CNT | |
189 | str r1, [r3] | |
190 | DELAY_FOR 0x4000, r0 | |
191 | ||
192 | /* send precharge-all command to close all open banks */ | |
193 | mov r1, #2 | |
194 | str r1, [r4] | |
195 | DELAY_FOR 0x4000, r0 | |
196 | ||
197 | /* provide 8 auto-refresh cycles */ | |
198 | mov r1, #4 | |
199 | mov r5, #8 | |
200 | 111: str r1, [r4] | |
201 | DELAY_FOR 0x100, r0 | |
202 | subs r5, r5, #1 | |
203 | bne 111b | |
204 | ||
205 | /* set mode register in sdram */ | |
206 | mov r1, #CONFIG_SYS_SDR_MODE_CONFIG | |
207 | str r1, [r4] | |
208 | DELAY_FOR 0x4000, r0 | |
209 | ||
210 | /* send normal operation command */ | |
211 | mov r1, #6 | |
212 | str r1, [r4] | |
213 | DELAY_FOR 0x4000, r0 | |
214 | ||
2af0a099 HS |
215 | /* invalidate I & D caches & BTB */ |
216 | mcr p15, 0, r0, c7, c7, 0 | |
217 | CPWAIT r0 | |
218 | ||
219 | /* invalidate I & Data TLB */ | |
220 | mcr p15, 0, r0, c8, c7, 0 | |
221 | CPWAIT r0 | |
222 | ||
223 | /* drain write and fill buffers */ | |
224 | mcr p15, 0, r0, c7, c10, 4 | |
225 | CPWAIT r0 | |
226 | ||
ce04bb41 | 227 | /* remove flash mirror at 0x00000000 */ |
2af0a099 HS |
228 | ldr r2, =IXP425_EXP_CFG0 |
229 | ldr r1, [r2] | |
230 | bic r1, r1, #0x80000000 | |
231 | str r1, [r2] | |
232 | ||
2af0a099 HS |
233 | /* invalidate I & Data TLB */ |
234 | mcr p15, 0, r0, c8, c7, 0 | |
235 | CPWAIT r0 | |
236 | ||
237 | /* enable I cache */ | |
238 | mrc p15, 0, r0, c1, c0, 0 | |
239 | orr r0, r0, #MMU_Control_I | |
240 | mcr p15, 0, r0, c1, c0, 0 | |
241 | CPWAIT r0 | |
242 | ||
243 | mrs r0,cpsr /* set the cpu to SVC32 mode */ | |
244 | bic r0,r0,#0x1f /* (superviser mode, M=10011) */ | |
245 | orr r0,r0,#0x13 | |
246 | msr cpsr,r0 | |
247 | ||
ce04bb41 | 248 | /* Set initial stackpointer in SDRAM to call board_init_f */ |
2af0a099 HS |
249 | call_board_init_f: |
250 | ldr sp, =(CONFIG_SYS_INIT_SP_ADDR) | |
296cae73 | 251 | bic sp, sp, #7 /* 8-byte alignment for ABI compliance */ |
2af0a099 HS |
252 | ldr r0,=0x00000000 |
253 | bl board_init_f | |
254 | ||
255 | /*------------------------------------------------------------------------------*/ | |
256 | ||
257 | /* | |
258 | * void relocate_code (addr_sp, gd, addr_moni) | |
259 | * | |
260 | * This "function" does not return, instead it continues in RAM | |
261 | * after relocating the monitor code. | |
262 | * | |
263 | */ | |
264 | .globl relocate_code | |
265 | relocate_code: | |
266 | mov r4, r0 /* save addr_sp */ | |
267 | mov r5, r1 /* save addr of gd */ | |
268 | mov r6, r2 /* save addr of destination */ | |
2af0a099 HS |
269 | |
270 | /* Set up the stack */ | |
271 | stack_setup: | |
272 | mov sp, r4 | |
273 | ||
274 | adr r0, _start | |
a1a47d3c AB |
275 | cmp r0, r6 |
276 | beq clear_bss /* skip relocation */ | |
a78fb68f | 277 | mov r1, r6 /* r1 <- scratch for copy_loop */ |
3336ca60 AA |
278 | ldr r3, _bss_start_ofs |
279 | add r2, r0, r3 /* r2 <- source end address */ | |
2af0a099 | 280 | |
2af0a099 HS |
281 | copy_loop: |
282 | ldmia r0!, {r9-r10} /* copy from source address [r0] */ | |
a78fb68f | 283 | stmia r1!, {r9-r10} /* copy to target address [r1] */ |
da90d4ce AA |
284 | cmp r0, r2 /* until source end address [r2] */ |
285 | blo copy_loop | |
2af0a099 | 286 | |
401bb30b | 287 | #ifndef CONFIG_SPL_BUILD |
3336ca60 AA |
288 | /* |
289 | * fix .rel.dyn relocations | |
290 | */ | |
291 | ldr r0, _TEXT_BASE /* r0 <- Text base */ | |
a78fb68f | 292 | sub r9, r6, r0 /* r9 <- relocation offset */ |
3336ca60 AA |
293 | ldr r10, _dynsym_start_ofs /* r10 <- sym table ofs */ |
294 | add r10, r10, r0 /* r10 <- sym table in FLASH */ | |
295 | ldr r2, _rel_dyn_start_ofs /* r2 <- rel dyn start ofs */ | |
296 | add r2, r2, r0 /* r2 <- rel dyn start in FLASH */ | |
297 | ldr r3, _rel_dyn_end_ofs /* r3 <- rel dyn end ofs */ | |
298 | add r3, r3, r0 /* r3 <- rel dyn end in FLASH */ | |
2af0a099 | 299 | fixloop: |
3336ca60 AA |
300 | ldr r0, [r2] /* r0 <- location to fix up, IN FLASH! */ |
301 | add r0, r0, r9 /* r0 <- location to fix up in RAM */ | |
302 | ldr r1, [r2, #4] | |
1f52d89f AB |
303 | and r7, r1, #0xff |
304 | cmp r7, #23 /* relative fixup? */ | |
3336ca60 | 305 | beq fixrel |
1f52d89f | 306 | cmp r7, #2 /* absolute fixup? */ |
3336ca60 AA |
307 | beq fixabs |
308 | /* ignore unknown type of fixup */ | |
309 | b fixnext | |
310 | fixabs: | |
311 | /* absolute fix: set location to (offset) symbol value */ | |
312 | mov r1, r1, LSR #4 /* r1 <- symbol index in .dynsym */ | |
313 | add r1, r10, r1 /* r1 <- address of symbol in table */ | |
314 | ldr r1, [r1, #4] /* r1 <- symbol value */ | |
3600945b | 315 | add r1, r1, r9 /* r1 <- relocated sym addr */ |
3336ca60 AA |
316 | b fixnext |
317 | fixrel: | |
318 | /* relative fix: increase location by offset */ | |
319 | ldr r1, [r0] | |
320 | add r1, r1, r9 | |
321 | fixnext: | |
322 | str r1, [r0] | |
323 | add r2, r2, #8 /* each rel.dyn entry is 8 bytes */ | |
2af0a099 | 324 | cmp r2, r3 |
79e63139 | 325 | blo fixloop |
2af0a099 | 326 | #endif |
2af0a099 HS |
327 | |
328 | clear_bss: | |
401bb30b | 329 | #ifndef CONFIG_SPL_BUILD |
3336ca60 AA |
330 | ldr r0, _bss_start_ofs |
331 | ldr r1, _bss_end_ofs | |
a78fb68f | 332 | mov r4, r6 /* reloc addr */ |
2af0a099 | 333 | add r0, r0, r4 |
2af0a099 HS |
334 | add r1, r1, r4 |
335 | mov r2, #0x00000000 /* clear */ | |
336 | ||
337 | clbss_l:str r2, [r0] /* clear loop... */ | |
338 | add r0, r0, #4 | |
339 | cmp r0, r1 | |
340 | bne clbss_l | |
341 | ||
342 | bl coloured_LED_init | |
343 | bl red_LED_on | |
344 | #endif | |
345 | ||
346 | /* | |
347 | * We are done. Do not return, instead branch to second part of board | |
348 | * initialization, now running from RAM. | |
349 | */ | |
3336ca60 AA |
350 | ldr r0, _board_init_r_ofs |
351 | adr r1, _start | |
352 | add lr, r0, r1 | |
353 | add lr, lr, r9 | |
2af0a099 HS |
354 | /* setup parameters for board_init_r */ |
355 | mov r0, r5 /* gd_t */ | |
a78fb68f | 356 | mov r1, r6 /* dest_addr */ |
2af0a099 | 357 | /* jump to it ... */ |
2af0a099 HS |
358 | mov pc, lr |
359 | ||
3336ca60 AA |
360 | _board_init_r_ofs: |
361 | .word board_init_r - _start | |
2af0a099 | 362 | |
3336ca60 AA |
363 | _rel_dyn_start_ofs: |
364 | .word __rel_dyn_start - _start | |
365 | _rel_dyn_end_ofs: | |
366 | .word __rel_dyn_end - _start | |
367 | _dynsym_start_ofs: | |
368 | .word __dynsym_start - _start | |
2d5b561e | 369 | |
2d5b561e WD |
370 | /****************************************************************************/ |
371 | /* */ | |
372 | /* Interrupt handling */ | |
373 | /* */ | |
374 | /****************************************************************************/ | |
375 | ||
376 | /* IRQ stack frame */ | |
377 | ||
378 | #define S_FRAME_SIZE 72 | |
379 | ||
380 | #define S_OLD_R0 68 | |
381 | #define S_PSR 64 | |
382 | #define S_PC 60 | |
383 | #define S_LR 56 | |
384 | #define S_SP 52 | |
385 | ||
386 | #define S_IP 48 | |
387 | #define S_FP 44 | |
388 | #define S_R10 40 | |
389 | #define S_R9 36 | |
390 | #define S_R8 32 | |
391 | #define S_R7 28 | |
392 | #define S_R6 24 | |
393 | #define S_R5 20 | |
394 | #define S_R4 16 | |
395 | #define S_R3 12 | |
396 | #define S_R2 8 | |
397 | #define S_R1 4 | |
398 | #define S_R0 0 | |
399 | ||
400 | #define MODE_SVC 0x13 | |
401 | ||
402 | /* use bad_save_user_regs for abort/prefetch/undef/swi ... */ | |
403 | ||
404 | .macro bad_save_user_regs | |
405 | sub sp, sp, #S_FRAME_SIZE | |
406 | stmia sp, {r0 - r12} /* Calling r0-r12 */ | |
407 | add r8, sp, #S_PC | |
408 | ||
2af0a099 | 409 | ldr r2, IRQ_STACK_START_IN |
2d5b561e WD |
410 | ldmia r2, {r2 - r4} /* get pc, cpsr, old_r0 */ |
411 | add r0, sp, #S_FRAME_SIZE /* restore sp_SVC */ | |
412 | ||
413 | add r5, sp, #S_SP | |
414 | mov r1, lr | |
415 | stmia r5, {r0 - r4} /* save sp_SVC, lr_SVC, pc, cpsr, old_r */ | |
416 | mov r0, sp | |
417 | .endm | |
418 | ||
419 | ||
420 | /* use irq_save_user_regs / irq_restore_user_regs for */ | |
421 | /* IRQ/FIQ handling */ | |
422 | ||
423 | .macro irq_save_user_regs | |
424 | sub sp, sp, #S_FRAME_SIZE | |
425 | stmia sp, {r0 - r12} /* Calling r0-r12 */ | |
426 | add r8, sp, #S_PC | |
427 | stmdb r8, {sp, lr}^ /* Calling SP, LR */ | |
428 | str lr, [r8, #0] /* Save calling PC */ | |
429 | mrs r6, spsr | |
430 | str r6, [r8, #4] /* Save CPSR */ | |
431 | str r0, [r8, #8] /* Save OLD_R0 */ | |
432 | mov r0, sp | |
433 | .endm | |
434 | ||
435 | .macro irq_restore_user_regs | |
436 | ldmia sp, {r0 - lr}^ @ Calling r0 - lr | |
437 | mov r0, r0 | |
438 | ldr lr, [sp, #S_PC] @ Get PC | |
439 | add sp, sp, #S_FRAME_SIZE | |
440 | subs pc, lr, #4 @ return & move spsr_svc into cpsr | |
441 | .endm | |
442 | ||
443 | .macro get_bad_stack | |
2af0a099 | 444 | ldr r13, IRQ_STACK_START_IN @ setup our mode stack |
2d5b561e WD |
445 | |
446 | str lr, [r13] @ save caller lr / spsr | |
447 | mrs lr, spsr | |
448 | str lr, [r13, #4] | |
449 | ||
450 | mov r13, #MODE_SVC @ prepare SVC-Mode | |
451 | msr spsr_c, r13 | |
452 | mov lr, pc | |
453 | movs pc, lr | |
454 | .endm | |
455 | ||
456 | .macro get_irq_stack @ setup IRQ stack | |
457 | ldr sp, IRQ_STACK_START | |
458 | .endm | |
459 | ||
460 | .macro get_fiq_stack @ setup FIQ stack | |
461 | ldr sp, FIQ_STACK_START | |
462 | .endm | |
463 | ||
464 | ||
465 | /****************************************************************************/ | |
466 | /* */ | |
467 | /* exception handlers */ | |
468 | /* */ | |
469 | /****************************************************************************/ | |
470 | ||
471 | .align 5 | |
472 | undefined_instruction: | |
473 | get_bad_stack | |
474 | bad_save_user_regs | |
475 | bl do_undefined_instruction | |
476 | ||
477 | .align 5 | |
478 | software_interrupt: | |
479 | get_bad_stack | |
480 | bad_save_user_regs | |
481 | bl do_software_interrupt | |
482 | ||
483 | .align 5 | |
484 | prefetch_abort: | |
485 | get_bad_stack | |
486 | bad_save_user_regs | |
487 | bl do_prefetch_abort | |
488 | ||
489 | .align 5 | |
490 | data_abort: | |
491 | get_bad_stack | |
492 | bad_save_user_regs | |
493 | bl do_data_abort | |
494 | ||
495 | .align 5 | |
496 | not_used: | |
497 | get_bad_stack | |
498 | bad_save_user_regs | |
499 | bl do_not_used | |
500 | ||
501 | #ifdef CONFIG_USE_IRQ | |
502 | ||
503 | .align 5 | |
504 | irq: | |
505 | get_irq_stack | |
506 | irq_save_user_regs | |
507 | bl do_irq | |
508 | irq_restore_user_regs | |
509 | ||
510 | .align 5 | |
511 | fiq: | |
512 | get_fiq_stack | |
513 | irq_save_user_regs /* someone ought to write a more */ | |
514 | bl do_fiq /* effiction fiq_save_user_regs */ | |
515 | irq_restore_user_regs | |
516 | ||
517 | #else | |
518 | ||
519 | .align 5 | |
520 | irq: | |
521 | get_bad_stack | |
522 | bad_save_user_regs | |
523 | bl do_irq | |
524 | ||
525 | .align 5 | |
526 | fiq: | |
527 | get_bad_stack | |
528 | bad_save_user_regs | |
529 | bl do_fiq | |
530 | ||
531 | #endif | |
532 | ||
533 | /****************************************************************************/ | |
534 | /* */ | |
535 | /* Reset function: Use Watchdog to reset */ | |
536 | /* */ | |
537 | /****************************************************************************/ | |
538 | ||
539 | .align 5 | |
540 | .globl reset_cpu | |
541 | ||
542 | reset_cpu: | |
53677ef1 | 543 | ldr r1, =0x482e |
2d5b561e WD |
544 | ldr r2, =IXP425_OSWK |
545 | str r1, [r2] | |
53677ef1 | 546 | ldr r1, =0x0fff |
2d5b561e WD |
547 | ldr r2, =IXP425_OSWT |
548 | str r1, [r2] | |
53677ef1 | 549 | ldr r1, =0x5 |
2d5b561e WD |
550 | ldr r2, =IXP425_OSWE |
551 | str r1, [r2] | |
552 | b reset_endless | |
553 | ||
2d5b561e | 554 | reset_endless: |
2d5b561e | 555 | b reset_endless |