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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: |
508611bc BT |
101 | #if defined(CONFIG_SPL_BUILD) && defined(CONFIG_SPL_TEXT_BASE) |
102 | .word CONFIG_SPL_TEXT_BASE | |
103 | #else | |
14d0a02a | 104 | .word CONFIG_SYS_TEXT_BASE |
508611bc | 105 | #endif |
2d5b561e | 106 | |
2d5b561e | 107 | /* |
f6e20fc6 | 108 | * These are defined in the board-specific linker script. |
3336ca60 AA |
109 | * Subtracting _start from them lets the linker put their |
110 | * relative position in the executable instead of leaving | |
111 | * them null. | |
2d5b561e | 112 | */ |
3336ca60 AA |
113 | .globl _bss_start_ofs |
114 | _bss_start_ofs: | |
115 | .word __bss_start - _start | |
2d5b561e | 116 | |
7086e91b BT |
117 | .globl _image_copy_end_ofs |
118 | _image_copy_end_ofs: | |
119 | .word __image_copy_end - _start | |
120 | ||
3336ca60 AA |
121 | .globl _bss_end_ofs |
122 | _bss_end_ofs: | |
3929fb0a | 123 | .word __bss_end - _start |
2d5b561e | 124 | |
f326cbba PYC |
125 | .globl _end_ofs |
126 | _end_ofs: | |
127 | .word _end - _start | |
128 | ||
2d5b561e WD |
129 | #ifdef CONFIG_USE_IRQ |
130 | /* IRQ stack memory (calculated at run-time) */ | |
131 | .globl IRQ_STACK_START | |
132 | IRQ_STACK_START: | |
133 | .word 0x0badc0de | |
134 | ||
135 | /* IRQ stack memory (calculated at run-time) */ | |
136 | .globl FIQ_STACK_START | |
137 | FIQ_STACK_START: | |
138 | .word 0x0badc0de | |
139 | #endif | |
140 | ||
2af0a099 HS |
141 | /* IRQ stack memory (calculated at run-time) + 8 bytes */ |
142 | .globl IRQ_STACK_START_IN | |
143 | IRQ_STACK_START_IN: | |
144 | .word 0x0badc0de | |
145 | ||
2af0a099 HS |
146 | /* |
147 | * the actual reset code | |
148 | */ | |
149 | ||
150 | reset: | |
151 | /* disable mmu, set big-endian */ | |
152 | mov r0, #0xf8 | |
153 | mcr p15, 0, r0, c1, c0, 0 | |
154 | CPWAIT r0 | |
155 | ||
156 | /* invalidate I & D caches & BTB */ | |
157 | mcr p15, 0, r0, c7, c7, 0 | |
158 | CPWAIT r0 | |
159 | ||
160 | /* invalidate I & Data TLB */ | |
161 | mcr p15, 0, r0, c8, c7, 0 | |
162 | CPWAIT r0 | |
163 | ||
164 | /* drain write and fill buffers */ | |
165 | mcr p15, 0, r0, c7, c10, 4 | |
166 | CPWAIT r0 | |
167 | ||
168 | /* disable write buffer coalescing */ | |
169 | mrc p15, 0, r0, c1, c0, 1 | |
170 | orr r0, r0, #1 | |
171 | mcr p15, 0, r0, c1, c0, 1 | |
172 | CPWAIT r0 | |
173 | ||
174 | /* set EXP CS0 to the optimum timing */ | |
175 | ldr r1, =CONFIG_SYS_EXP_CS0 | |
176 | ldr r2, =IXP425_EXP_CS0 | |
177 | str r1, [r2] | |
178 | ||
179 | /* make sure flash is visible at 0 */ | |
2af0a099 HS |
180 | mov r1, #CONFIG_SYS_SDR_CONFIG |
181 | ldr r2, =IXP425_SDR_CONFIG | |
182 | str r1, [r2] | |
183 | ||
184 | /* disable refresh cycles */ | |
185 | mov r1, #0 | |
186 | ldr r3, =IXP425_SDR_REFRESH | |
187 | str r1, [r3] | |
188 | ||
189 | /* send nop command */ | |
190 | mov r1, #3 | |
191 | ldr r4, =IXP425_SDR_IR | |
192 | str r1, [r4] | |
193 | DELAY_FOR 0x4000, r0 | |
194 | ||
195 | /* set SDRAM internal refresh val */ | |
196 | ldr r1, =CONFIG_SYS_SDRAM_REFRESH_CNT | |
197 | str r1, [r3] | |
198 | DELAY_FOR 0x4000, r0 | |
199 | ||
200 | /* send precharge-all command to close all open banks */ | |
201 | mov r1, #2 | |
202 | str r1, [r4] | |
203 | DELAY_FOR 0x4000, r0 | |
204 | ||
205 | /* provide 8 auto-refresh cycles */ | |
206 | mov r1, #4 | |
207 | mov r5, #8 | |
208 | 111: str r1, [r4] | |
209 | DELAY_FOR 0x100, r0 | |
210 | subs r5, r5, #1 | |
211 | bne 111b | |
212 | ||
213 | /* set mode register in sdram */ | |
214 | mov r1, #CONFIG_SYS_SDR_MODE_CONFIG | |
215 | str r1, [r4] | |
216 | DELAY_FOR 0x4000, r0 | |
217 | ||
218 | /* send normal operation command */ | |
219 | mov r1, #6 | |
220 | str r1, [r4] | |
221 | DELAY_FOR 0x4000, r0 | |
222 | ||
2af0a099 HS |
223 | /* invalidate I & D caches & BTB */ |
224 | mcr p15, 0, r0, c7, c7, 0 | |
225 | CPWAIT r0 | |
226 | ||
227 | /* invalidate I & Data TLB */ | |
228 | mcr p15, 0, r0, c8, c7, 0 | |
229 | CPWAIT r0 | |
230 | ||
231 | /* drain write and fill buffers */ | |
232 | mcr p15, 0, r0, c7, c10, 4 | |
233 | CPWAIT r0 | |
234 | ||
ce04bb41 | 235 | /* remove flash mirror at 0x00000000 */ |
2af0a099 HS |
236 | ldr r2, =IXP425_EXP_CFG0 |
237 | ldr r1, [r2] | |
238 | bic r1, r1, #0x80000000 | |
239 | str r1, [r2] | |
240 | ||
2af0a099 HS |
241 | /* invalidate I & Data TLB */ |
242 | mcr p15, 0, r0, c8, c7, 0 | |
243 | CPWAIT r0 | |
244 | ||
245 | /* enable I cache */ | |
246 | mrc p15, 0, r0, c1, c0, 0 | |
247 | orr r0, r0, #MMU_Control_I | |
248 | mcr p15, 0, r0, c1, c0, 0 | |
249 | CPWAIT r0 | |
250 | ||
251 | mrs r0,cpsr /* set the cpu to SVC32 mode */ | |
252 | bic r0,r0,#0x1f /* (superviser mode, M=10011) */ | |
253 | orr r0,r0,#0x13 | |
254 | msr cpsr,r0 | |
255 | ||
e05e5de7 | 256 | bl _main |
2af0a099 HS |
257 | |
258 | /*------------------------------------------------------------------------------*/ | |
259 | ||
260 | /* | |
5c6db120 | 261 | * void relocate_code(addr_moni) |
2af0a099 | 262 | * |
959eaa74 | 263 | * This function relocates the monitor code. |
2af0a099 HS |
264 | */ |
265 | .globl relocate_code | |
266 | relocate_code: | |
5c6db120 | 267 | mov r6, r0 /* save addr of destination */ |
2af0a099 | 268 | |
2af0a099 | 269 | adr r0, _start |
4b3db1cd | 270 | subs r9, r6, r0 /* r9 <- relocation offset */ |
e05e5de7 | 271 | beq relocate_done /* skip relocation */ |
a78fb68f | 272 | mov r1, r6 /* r1 <- scratch for copy_loop */ |
7086e91b | 273 | ldr r3, _image_copy_end_ofs |
3336ca60 | 274 | add r2, r0, r3 /* r2 <- source end address */ |
2af0a099 | 275 | |
2af0a099 | 276 | copy_loop: |
4b3db1cd BT |
277 | ldmia r0!, {r10-r11} /* copy from source address [r0] */ |
278 | stmia r1!, {r10-r11} /* copy to target address [r1] */ | |
da90d4ce AA |
279 | cmp r0, r2 /* until source end address [r2] */ |
280 | blo copy_loop | |
2af0a099 | 281 | |
401bb30b | 282 | #ifndef CONFIG_SPL_BUILD |
3336ca60 AA |
283 | /* |
284 | * fix .rel.dyn relocations | |
285 | */ | |
286 | ldr r0, _TEXT_BASE /* r0 <- Text base */ | |
3336ca60 AA |
287 | ldr r10, _dynsym_start_ofs /* r10 <- sym table ofs */ |
288 | add r10, r10, r0 /* r10 <- sym table in FLASH */ | |
289 | ldr r2, _rel_dyn_start_ofs /* r2 <- rel dyn start ofs */ | |
290 | add r2, r2, r0 /* r2 <- rel dyn start in FLASH */ | |
291 | ldr r3, _rel_dyn_end_ofs /* r3 <- rel dyn end ofs */ | |
292 | add r3, r3, r0 /* r3 <- rel dyn end in FLASH */ | |
2af0a099 | 293 | fixloop: |
3336ca60 AA |
294 | ldr r0, [r2] /* r0 <- location to fix up, IN FLASH! */ |
295 | add r0, r0, r9 /* r0 <- location to fix up in RAM */ | |
296 | ldr r1, [r2, #4] | |
1f52d89f AB |
297 | and r7, r1, #0xff |
298 | cmp r7, #23 /* relative fixup? */ | |
3336ca60 | 299 | beq fixrel |
1f52d89f | 300 | cmp r7, #2 /* absolute fixup? */ |
3336ca60 AA |
301 | beq fixabs |
302 | /* ignore unknown type of fixup */ | |
303 | b fixnext | |
304 | fixabs: | |
305 | /* absolute fix: set location to (offset) symbol value */ | |
306 | mov r1, r1, LSR #4 /* r1 <- symbol index in .dynsym */ | |
307 | add r1, r10, r1 /* r1 <- address of symbol in table */ | |
308 | ldr r1, [r1, #4] /* r1 <- symbol value */ | |
3600945b | 309 | add r1, r1, r9 /* r1 <- relocated sym addr */ |
3336ca60 AA |
310 | b fixnext |
311 | fixrel: | |
312 | /* relative fix: increase location by offset */ | |
313 | ldr r1, [r0] | |
314 | add r1, r1, r9 | |
315 | fixnext: | |
316 | str r1, [r0] | |
317 | add r2, r2, #8 /* each rel.dyn entry is 8 bytes */ | |
2af0a099 | 318 | cmp r2, r3 |
79e63139 | 319 | blo fixloop |
2af0a099 | 320 | #endif |
2af0a099 | 321 | |
e05e5de7 | 322 | relocate_done: |
2af0a099 | 323 | |
e05e5de7 | 324 | bx lr |
2af0a099 | 325 | |
3336ca60 AA |
326 | _rel_dyn_start_ofs: |
327 | .word __rel_dyn_start - _start | |
328 | _rel_dyn_end_ofs: | |
329 | .word __rel_dyn_end - _start | |
330 | _dynsym_start_ofs: | |
331 | .word __dynsym_start - _start | |
2d5b561e | 332 | |
e05e5de7 AA |
333 | .globl c_runtime_cpu_setup |
334 | c_runtime_cpu_setup: | |
335 | ||
336 | bx lr | |
337 | ||
2d5b561e WD |
338 | /****************************************************************************/ |
339 | /* */ | |
340 | /* Interrupt handling */ | |
341 | /* */ | |
342 | /****************************************************************************/ | |
343 | ||
344 | /* IRQ stack frame */ | |
345 | ||
346 | #define S_FRAME_SIZE 72 | |
347 | ||
348 | #define S_OLD_R0 68 | |
349 | #define S_PSR 64 | |
350 | #define S_PC 60 | |
351 | #define S_LR 56 | |
352 | #define S_SP 52 | |
353 | ||
354 | #define S_IP 48 | |
355 | #define S_FP 44 | |
356 | #define S_R10 40 | |
357 | #define S_R9 36 | |
358 | #define S_R8 32 | |
359 | #define S_R7 28 | |
360 | #define S_R6 24 | |
361 | #define S_R5 20 | |
362 | #define S_R4 16 | |
363 | #define S_R3 12 | |
364 | #define S_R2 8 | |
365 | #define S_R1 4 | |
366 | #define S_R0 0 | |
367 | ||
368 | #define MODE_SVC 0x13 | |
369 | ||
370 | /* use bad_save_user_regs for abort/prefetch/undef/swi ... */ | |
371 | ||
372 | .macro bad_save_user_regs | |
373 | sub sp, sp, #S_FRAME_SIZE | |
374 | stmia sp, {r0 - r12} /* Calling r0-r12 */ | |
375 | add r8, sp, #S_PC | |
376 | ||
2af0a099 | 377 | ldr r2, IRQ_STACK_START_IN |
2d5b561e WD |
378 | ldmia r2, {r2 - r4} /* get pc, cpsr, old_r0 */ |
379 | add r0, sp, #S_FRAME_SIZE /* restore sp_SVC */ | |
380 | ||
381 | add r5, sp, #S_SP | |
382 | mov r1, lr | |
383 | stmia r5, {r0 - r4} /* save sp_SVC, lr_SVC, pc, cpsr, old_r */ | |
384 | mov r0, sp | |
385 | .endm | |
386 | ||
387 | ||
388 | /* use irq_save_user_regs / irq_restore_user_regs for */ | |
389 | /* IRQ/FIQ handling */ | |
390 | ||
391 | .macro irq_save_user_regs | |
392 | sub sp, sp, #S_FRAME_SIZE | |
393 | stmia sp, {r0 - r12} /* Calling r0-r12 */ | |
394 | add r8, sp, #S_PC | |
395 | stmdb r8, {sp, lr}^ /* Calling SP, LR */ | |
396 | str lr, [r8, #0] /* Save calling PC */ | |
397 | mrs r6, spsr | |
398 | str r6, [r8, #4] /* Save CPSR */ | |
399 | str r0, [r8, #8] /* Save OLD_R0 */ | |
400 | mov r0, sp | |
401 | .endm | |
402 | ||
403 | .macro irq_restore_user_regs | |
404 | ldmia sp, {r0 - lr}^ @ Calling r0 - lr | |
405 | mov r0, r0 | |
406 | ldr lr, [sp, #S_PC] @ Get PC | |
407 | add sp, sp, #S_FRAME_SIZE | |
408 | subs pc, lr, #4 @ return & move spsr_svc into cpsr | |
409 | .endm | |
410 | ||
411 | .macro get_bad_stack | |
2af0a099 | 412 | ldr r13, IRQ_STACK_START_IN @ setup our mode stack |
2d5b561e WD |
413 | |
414 | str lr, [r13] @ save caller lr / spsr | |
415 | mrs lr, spsr | |
416 | str lr, [r13, #4] | |
417 | ||
418 | mov r13, #MODE_SVC @ prepare SVC-Mode | |
419 | msr spsr_c, r13 | |
420 | mov lr, pc | |
421 | movs pc, lr | |
422 | .endm | |
423 | ||
424 | .macro get_irq_stack @ setup IRQ stack | |
425 | ldr sp, IRQ_STACK_START | |
426 | .endm | |
427 | ||
428 | .macro get_fiq_stack @ setup FIQ stack | |
429 | ldr sp, FIQ_STACK_START | |
430 | .endm | |
431 | ||
432 | ||
433 | /****************************************************************************/ | |
434 | /* */ | |
435 | /* exception handlers */ | |
436 | /* */ | |
437 | /****************************************************************************/ | |
438 | ||
439 | .align 5 | |
440 | undefined_instruction: | |
441 | get_bad_stack | |
442 | bad_save_user_regs | |
443 | bl do_undefined_instruction | |
444 | ||
445 | .align 5 | |
446 | software_interrupt: | |
447 | get_bad_stack | |
448 | bad_save_user_regs | |
449 | bl do_software_interrupt | |
450 | ||
451 | .align 5 | |
452 | prefetch_abort: | |
453 | get_bad_stack | |
454 | bad_save_user_regs | |
455 | bl do_prefetch_abort | |
456 | ||
457 | .align 5 | |
458 | data_abort: | |
459 | get_bad_stack | |
460 | bad_save_user_regs | |
461 | bl do_data_abort | |
462 | ||
463 | .align 5 | |
464 | not_used: | |
465 | get_bad_stack | |
466 | bad_save_user_regs | |
467 | bl do_not_used | |
468 | ||
469 | #ifdef CONFIG_USE_IRQ | |
470 | ||
471 | .align 5 | |
472 | irq: | |
473 | get_irq_stack | |
474 | irq_save_user_regs | |
475 | bl do_irq | |
476 | irq_restore_user_regs | |
477 | ||
478 | .align 5 | |
479 | fiq: | |
480 | get_fiq_stack | |
481 | irq_save_user_regs /* someone ought to write a more */ | |
482 | bl do_fiq /* effiction fiq_save_user_regs */ | |
483 | irq_restore_user_regs | |
484 | ||
485 | #else | |
486 | ||
487 | .align 5 | |
488 | irq: | |
489 | get_bad_stack | |
490 | bad_save_user_regs | |
491 | bl do_irq | |
492 | ||
493 | .align 5 | |
494 | fiq: | |
495 | get_bad_stack | |
496 | bad_save_user_regs | |
497 | bl do_fiq | |
498 | ||
499 | #endif | |
500 | ||
501 | /****************************************************************************/ | |
502 | /* */ | |
503 | /* Reset function: Use Watchdog to reset */ | |
504 | /* */ | |
505 | /****************************************************************************/ | |
506 | ||
507 | .align 5 | |
508 | .globl reset_cpu | |
509 | ||
510 | reset_cpu: | |
53677ef1 | 511 | ldr r1, =0x482e |
2d5b561e WD |
512 | ldr r2, =IXP425_OSWK |
513 | str r1, [r2] | |
53677ef1 | 514 | ldr r1, =0x0fff |
2d5b561e WD |
515 | ldr r2, =IXP425_OSWT |
516 | str r1, [r2] | |
53677ef1 | 517 | ldr r1, =0x5 |
2d5b561e WD |
518 | ldr r2, =IXP425_OSWE |
519 | str r1, [r2] | |
520 | b reset_endless | |
521 | ||
2d5b561e | 522 | reset_endless: |
2d5b561e | 523 | b reset_endless |