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1 | /* arch/m68knommu/platform/68360/head-ram.S |
2 | * | |
3 | * Startup code for Motorola 68360 | |
4 | * | |
5 | * Copyright 2001 (C) SED Systems, a Division of Calian Ltd. | |
6 | * Based on: arch/m68knommu/platform/68328/pilot/crt0_rom.S | |
7 | * Based on: arch/m68knommu/platform/68360/uCquicc/crt0_rom.S, 2.0.38.1.pre7 | |
8 | * uClinux Kernel | |
9 | * Copyright (C) Michael Leslie <mleslie@lineo.com> | |
10 | * Based on: arch/m68knommu/platform/68EZ328/ucsimm/crt0_rom.S | |
11 | * Copyright (C) 1998 D. Jeff Dionne <jeff@uclinux.org>, | |
12 | * | |
13 | */ | |
14 | #define ASSEMBLY | |
81d4903d GU |
15 | |
16 | .global _stext | |
17 | .global _start | |
18 | ||
19 | .global _rambase | |
81d4903d GU |
20 | .global _ramvec |
21 | .global _ramstart | |
22 | .global _ramend | |
23 | ||
24 | .global _quicc_base | |
25 | .global _periph_base | |
26 | ||
d046f611 GU |
27 | #define RAMEND (CONFIG_RAMBASE + CONFIG_RAMSIZE) |
28 | ||
81d4903d GU |
29 | #define REGB 0x1000 |
30 | #define PEPAR (_dprbase + REGB + 0x0016) | |
31 | #define GMR (_dprbase + REGB + 0x0040) | |
32 | #define OR0 (_dprbase + REGB + 0x0054) | |
33 | #define BR0 (_dprbase + REGB + 0x0050) | |
34 | #define OR1 (_dprbase + REGB + 0x0064) | |
35 | #define BR1 (_dprbase + REGB + 0x0060) | |
36 | #define OR4 (_dprbase + REGB + 0x0094) | |
37 | #define BR4 (_dprbase + REGB + 0x0090) | |
38 | #define OR6 (_dprbase + REGB + 0x00b4) | |
39 | #define BR6 (_dprbase + REGB + 0x00b0) | |
40 | #define OR7 (_dprbase + REGB + 0x00c4) | |
41 | #define BR7 (_dprbase + REGB + 0x00c0) | |
42 | ||
43 | #define MCR (_dprbase + REGB + 0x0000) | |
44 | #define AVR (_dprbase + REGB + 0x0008) | |
45 | ||
46 | #define SYPCR (_dprbase + REGB + 0x0022) | |
47 | ||
48 | #define PLLCR (_dprbase + REGB + 0x0010) | |
49 | #define CLKOCR (_dprbase + REGB + 0x000C) | |
50 | #define CDVCR (_dprbase + REGB + 0x0014) | |
51 | ||
52 | #define BKAR (_dprbase + REGB + 0x0030) | |
53 | #define BKCR (_dprbase + REGB + 0x0034) | |
54 | #define SWIV (_dprbase + REGB + 0x0023) | |
55 | #define PICR (_dprbase + REGB + 0x0026) | |
56 | #define PITR (_dprbase + REGB + 0x002A) | |
57 | ||
58 | /* Define for all memory configuration */ | |
59 | #define MCU_SIM_GMR 0x00000000 | |
60 | #define SIM_OR_MASK 0x0fffffff | |
61 | ||
62 | /* Defines for chip select zero - the flash */ | |
63 | #define SIM_OR0_MASK 0x20000002 | |
64 | #define SIM_BR0_MASK 0x00000001 | |
65 | ||
66 | ||
67 | /* Defines for chip select one - the RAM */ | |
68 | #define SIM_OR1_MASK 0x10000000 | |
69 | #define SIM_BR1_MASK 0x00000001 | |
70 | ||
71 | #define MCU_SIM_MBAR_ADRS 0x0003ff00 | |
72 | #define MCU_SIM_MBAR_BA_MASK 0xfffff000 | |
73 | #define MCU_SIM_MBAR_AS_MASK 0x00000001 | |
74 | ||
75 | #define MCU_SIM_PEPAR 0x00B4 | |
76 | ||
77 | #define MCU_DISABLE_INTRPTS 0x2700 | |
78 | #define MCU_SIM_AVR 0x00 | |
79 | ||
80 | #define MCU_SIM_MCR 0x00005cff | |
81 | ||
82 | #define MCU_SIM_CLKOCR 0x00 | |
83 | #define MCU_SIM_PLLCR 0x8000 | |
84 | #define MCU_SIM_CDVCR 0x0000 | |
85 | ||
86 | #define MCU_SIM_SYPCR 0x0000 | |
87 | #define MCU_SIM_SWIV 0x00 | |
88 | #define MCU_SIM_PICR 0x0000 | |
89 | #define MCU_SIM_PITR 0x0000 | |
90 | ||
91 | ||
92 | #include <asm/m68360_regs.h> | |
93 | ||
94 | ||
95 | /* | |
96 | * By the time this RAM specific code begins to execute, DPRAM | |
97 | * and DRAM should already be mapped and accessible. | |
98 | */ | |
99 | ||
100 | .text | |
101 | _start: | |
102 | _stext: | |
103 | nop | |
104 | ori.w #MCU_DISABLE_INTRPTS, %sr /* disable interrupts: */ | |
105 | /* We should not need to setup the boot stack the reset should do it. */ | |
d046f611 | 106 | movea.l #RAMEND, %sp /*set up stack at the end of DRAM:*/ |
81d4903d GU |
107 | |
108 | set_mbar_register: | |
109 | moveq.l #0x07, %d1 /* Setup MBAR */ | |
110 | movec %d1, %dfc | |
111 | ||
112 | lea.l MCU_SIM_MBAR_ADRS, %a0 | |
113 | move.l #_dprbase, %d0 | |
114 | andi.l #MCU_SIM_MBAR_BA_MASK, %d0 | |
115 | ori.l #MCU_SIM_MBAR_AS_MASK, %d0 | |
116 | moves.l %d0, %a0@ | |
117 | ||
118 | moveq.l #0x05, %d1 | |
119 | movec.l %d1, %dfc | |
120 | ||
121 | /* Now we can begin to access registers in DPRAM */ | |
122 | ||
123 | set_sim_mcr: | |
124 | /* Set Module Configuration Register */ | |
125 | move.l #MCU_SIM_MCR, MCR | |
126 | ||
127 | /* to do: Determine cause of reset */ | |
128 | ||
129 | /* | |
130 | * configure system clock MC68360 p. 6-40 | |
131 | * (value +1)*osc/128 = system clock | |
132 | */ | |
133 | set_sim_clock: | |
134 | move.w #MCU_SIM_PLLCR, PLLCR | |
135 | move.b #MCU_SIM_CLKOCR, CLKOCR | |
136 | move.w #MCU_SIM_CDVCR, CDVCR | |
137 | ||
138 | /* Wait for the PLL to settle */ | |
139 | move.w #16384, %d0 | |
140 | pll_settle_wait: | |
141 | subi.w #1, %d0 | |
142 | bne pll_settle_wait | |
143 | ||
144 | /* Setup the system protection register, and watchdog timer register */ | |
145 | move.b #MCU_SIM_SWIV, SWIV | |
146 | move.w #MCU_SIM_PICR, PICR | |
147 | move.w #MCU_SIM_PITR, PITR | |
148 | move.w #MCU_SIM_SYPCR, SYPCR | |
149 | ||
150 | /* Clear DPRAM - system + parameter */ | |
151 | movea.l #_dprbase, %a0 | |
152 | movea.l #_dprbase+0x2000, %a1 | |
153 | ||
154 | /* Copy 0 to %a0 until %a0 == %a1 */ | |
155 | clear_dpram: | |
156 | movel #0, %a0@+ | |
157 | cmpal %a0, %a1 | |
158 | bhi clear_dpram | |
159 | ||
160 | configure_memory_controller: | |
161 | /* Set up Global Memory Register (GMR) */ | |
162 | move.l #MCU_SIM_GMR, %d0 | |
163 | move.l %d0, GMR | |
164 | ||
165 | configure_chip_select_0: | |
d046f611 | 166 | move.l #RAMEND, %d0 |
81d4903d GU |
167 | subi.l #__ramstart, %d0 |
168 | subq.l #0x01, %d0 | |
169 | eori.l #SIM_OR_MASK, %d0 | |
170 | ori.l #SIM_OR0_MASK, %d0 | |
171 | move.l %d0, OR0 | |
172 | ||
173 | move.l #__ramstart, %d0 | |
174 | ori.l #SIM_BR0_MASK, %d0 | |
175 | move.l %d0, BR0 | |
176 | ||
177 | configure_chip_select_1: | |
178 | move.l #__rom_end, %d0 | |
179 | subi.l #__rom_start, %d0 | |
180 | subq.l #0x01, %d0 | |
181 | eori.l #SIM_OR_MASK, %d0 | |
182 | ori.l #SIM_OR1_MASK, %d0 | |
183 | move.l %d0, OR1 | |
184 | ||
185 | move.l #__rom_start, %d0 | |
186 | ori.l #SIM_BR1_MASK, %d0 | |
187 | move.l %d0, BR1 | |
188 | ||
189 | move.w #MCU_SIM_PEPAR, PEPAR | |
190 | ||
191 | /* point to vector table: */ | |
192 | move.l #_romvec, %a0 | |
193 | move.l #_ramvec, %a1 | |
194 | copy_vectors: | |
195 | move.l %a0@, %d0 | |
196 | move.l %d0, %a1@ | |
197 | move.l %a0@, %a1@ | |
198 | addq.l #0x04, %a0 | |
199 | addq.l #0x04, %a1 | |
200 | cmp.l #_start, %a0 | |
201 | blt copy_vectors | |
202 | ||
203 | move.l #_ramvec, %a1 | |
204 | movec %a1, %vbr | |
205 | ||
206 | ||
207 | /* Copy data segment from ROM to RAM */ | |
208 | moveal #_stext, %a0 | |
209 | moveal #_sdata, %a1 | |
210 | moveal #_edata, %a2 | |
211 | ||
212 | /* Copy %a0 to %a1 until %a1 == %a2 */ | |
213 | LD1: | |
214 | move.l %a0@, %d0 | |
215 | addq.l #0x04, %a0 | |
216 | move.l %d0, %a1@ | |
217 | addq.l #0x04, %a1 | |
218 | cmp.l #_edata, %a1 | |
219 | blt LD1 | |
220 | ||
221 | moveal #_sbss, %a0 | |
222 | moveal #_ebss, %a1 | |
223 | ||
224 | /* Copy 0 to %a0 until %a0 == %a1 */ | |
225 | L1: | |
226 | movel #0, %a0@+ | |
227 | cmpal %a0, %a1 | |
228 | bhi L1 | |
229 | ||
230 | load_quicc: | |
231 | move.l #_dprbase, _quicc_base | |
232 | ||
233 | store_ram_size: | |
234 | /* Set ram size information */ | |
235 | move.l #_sdata, _rambase | |
236 | move.l #_ebss, _ramstart | |
d046f611 | 237 | move.l #RAMEND, %d0 |
81d4903d | 238 | sub.l #0x1000, %d0 /* Reserve 4K for stack space.*/ |
d046f611 | 239 | move.l %d0, _ramend /* Different from RAMEND.*/ |
81d4903d | 240 | |
81d4903d GU |
241 | pea 0 |
242 | pea env | |
243 | pea %sp@(4) | |
244 | pea 0 | |
245 | ||
246 | lea init_thread_union, %a2 | |
247 | lea 0x2000(%a2), %sp | |
248 | ||
249 | lp: | |
250 | jsr start_kernel | |
251 | ||
252 | _exit: | |
253 | jmp _exit | |
254 | ||
255 | ||
256 | .data | |
257 | .align 4 | |
258 | env: | |
259 | .long 0 | |
260 | _quicc_base: | |
261 | .long 0 | |
262 | _periph_base: | |
263 | .long 0 | |
264 | _ramvec: | |
265 | .long 0 | |
266 | _rambase: | |
267 | .long 0 | |
268 | _ramstart: | |
269 | .long 0 | |
270 | _ramend: | |
271 | .long 0 | |
272 | _dprbase: | |
273 | .long 0xffffe000 | |
274 | ||
275 | .text | |
276 | ||
277 | /* | |
278 | * These are the exception vectors at boot up, they are copied into RAM | |
279 | * and then overwritten as needed. | |
280 | */ | |
281 | ||
282 | .section ".data.initvect","awx" | |
d046f611 | 283 | .long RAMEND /* Reset: Initial Stack Pointer - 0. */ |
81d4903d GU |
284 | .long _start /* Reset: Initial Program Counter - 1. */ |
285 | .long buserr /* Bus Error - 2. */ | |
286 | .long trap /* Address Error - 3. */ | |
287 | .long trap /* Illegal Instruction - 4. */ | |
288 | .long trap /* Divide by zero - 5. */ | |
289 | .long trap /* CHK, CHK2 Instructions - 6. */ | |
290 | .long trap /* TRAPcc, TRAPV Instructions - 7. */ | |
291 | .long trap /* Privilege Violation - 8. */ | |
292 | .long trap /* Trace - 9. */ | |
293 | .long trap /* Line 1010 Emulator - 10. */ | |
294 | .long trap /* Line 1111 Emualtor - 11. */ | |
295 | .long trap /* Harware Breakpoint - 12. */ | |
296 | .long trap /* (Reserved for Coprocessor Protocol Violation)- 13. */ | |
297 | .long trap /* Format Error - 14. */ | |
298 | .long trap /* Uninitialized Interrupt - 15. */ | |
299 | .long trap /* (Unassigned, Reserver) - 16. */ | |
300 | .long trap /* (Unassigned, Reserver) - 17. */ | |
301 | .long trap /* (Unassigned, Reserver) - 18. */ | |
302 | .long trap /* (Unassigned, Reserver) - 19. */ | |
303 | .long trap /* (Unassigned, Reserver) - 20. */ | |
304 | .long trap /* (Unassigned, Reserver) - 21. */ | |
305 | .long trap /* (Unassigned, Reserver) - 22. */ | |
306 | .long trap /* (Unassigned, Reserver) - 23. */ | |
307 | .long trap /* Spurious Interrupt - 24. */ | |
308 | .long trap /* Level 1 Interrupt Autovector - 25. */ | |
309 | .long trap /* Level 2 Interrupt Autovector - 26. */ | |
310 | .long trap /* Level 3 Interrupt Autovector - 27. */ | |
311 | .long trap /* Level 4 Interrupt Autovector - 28. */ | |
312 | .long trap /* Level 5 Interrupt Autovector - 29. */ | |
313 | .long trap /* Level 6 Interrupt Autovector - 30. */ | |
314 | .long trap /* Level 7 Interrupt Autovector - 31. */ | |
315 | .long system_call /* Trap Instruction Vectors 0 - 32. */ | |
316 | .long trap /* Trap Instruction Vectors 1 - 33. */ | |
317 | .long trap /* Trap Instruction Vectors 2 - 34. */ | |
318 | .long trap /* Trap Instruction Vectors 3 - 35. */ | |
319 | .long trap /* Trap Instruction Vectors 4 - 36. */ | |
320 | .long trap /* Trap Instruction Vectors 5 - 37. */ | |
321 | .long trap /* Trap Instruction Vectors 6 - 38. */ | |
322 | .long trap /* Trap Instruction Vectors 7 - 39. */ | |
323 | .long trap /* Trap Instruction Vectors 8 - 40. */ | |
324 | .long trap /* Trap Instruction Vectors 9 - 41. */ | |
325 | .long trap /* Trap Instruction Vectors 10 - 42. */ | |
326 | .long trap /* Trap Instruction Vectors 11 - 43. */ | |
327 | .long trap /* Trap Instruction Vectors 12 - 44. */ | |
328 | .long trap /* Trap Instruction Vectors 13 - 45. */ | |
329 | .long trap /* Trap Instruction Vectors 14 - 46. */ | |
330 | .long trap /* Trap Instruction Vectors 15 - 47. */ | |
331 | .long 0 /* (Reserved for Coprocessor) - 48. */ | |
332 | .long 0 /* (Reserved for Coprocessor) - 49. */ | |
333 | .long 0 /* (Reserved for Coprocessor) - 50. */ | |
334 | .long 0 /* (Reserved for Coprocessor) - 51. */ | |
335 | .long 0 /* (Reserved for Coprocessor) - 52. */ | |
336 | .long 0 /* (Reserved for Coprocessor) - 53. */ | |
337 | .long 0 /* (Reserved for Coprocessor) - 54. */ | |
338 | .long 0 /* (Reserved for Coprocessor) - 55. */ | |
339 | .long 0 /* (Reserved for Coprocessor) - 56. */ | |
340 | .long 0 /* (Reserved for Coprocessor) - 57. */ | |
341 | .long 0 /* (Reserved for Coprocessor) - 58. */ | |
342 | .long 0 /* (Unassigned, Reserved) - 59. */ | |
343 | .long 0 /* (Unassigned, Reserved) - 60. */ | |
344 | .long 0 /* (Unassigned, Reserved) - 61. */ | |
345 | .long 0 /* (Unassigned, Reserved) - 62. */ | |
346 | .long 0 /* (Unassigned, Reserved) - 63. */ | |
347 | /* The assignment of these vectors to the CPM is */ | |
348 | /* dependent on the configuration of the CPM vba */ | |
349 | /* fields. */ | |
350 | .long 0 /* (User-Defined Vectors 1) CPM Error - 64. */ | |
351 | .long 0 /* (User-Defined Vectors 2) CPM Parallel IO PC11- 65. */ | |
352 | .long 0 /* (User-Defined Vectors 3) CPM Parallel IO PC10- 66. */ | |
353 | .long 0 /* (User-Defined Vectors 4) CPM SMC2 / PIP - 67. */ | |
354 | .long 0 /* (User-Defined Vectors 5) CPM SMC1 - 68. */ | |
355 | .long 0 /* (User-Defined Vectors 6) CPM SPI - 69. */ | |
356 | .long 0 /* (User-Defined Vectors 7) CPM Parallel IO PC9 - 70. */ | |
357 | .long 0 /* (User-Defined Vectors 8) CPM Timer 4 - 71. */ | |
358 | .long 0 /* (User-Defined Vectors 9) CPM Reserved - 72. */ | |
359 | .long 0 /* (User-Defined Vectors 10) CPM Parallel IO PC8- 73. */ | |
360 | .long 0 /* (User-Defined Vectors 11) CPM Parallel IO PC7- 74. */ | |
361 | .long 0 /* (User-Defined Vectors 12) CPM Parallel IO PC6- 75. */ | |
362 | .long 0 /* (User-Defined Vectors 13) CPM Timer 3 - 76. */ | |
363 | .long 0 /* (User-Defined Vectors 14) CPM Reserved - 77. */ | |
364 | .long 0 /* (User-Defined Vectors 15) CPM Parallel IO PC5- 78. */ | |
365 | .long 0 /* (User-Defined Vectors 16) CPM Parallel IO PC4- 79. */ | |
366 | .long 0 /* (User-Defined Vectors 17) CPM Reserved - 80. */ | |
367 | .long 0 /* (User-Defined Vectors 18) CPM RISC Timer Tbl - 81. */ | |
368 | .long 0 /* (User-Defined Vectors 19) CPM Timer 2 - 82. */ | |
369 | .long 0 /* (User-Defined Vectors 21) CPM Reserved - 83. */ | |
370 | .long 0 /* (User-Defined Vectors 22) CPM IDMA2 - 84. */ | |
371 | .long 0 /* (User-Defined Vectors 23) CPM IDMA1 - 85. */ | |
372 | .long 0 /* (User-Defined Vectors 24) CPM SDMA Bus Err - 86. */ | |
373 | .long 0 /* (User-Defined Vectors 25) CPM Parallel IO PC3- 87. */ | |
374 | .long 0 /* (User-Defined Vectors 26) CPM Parallel IO PC2- 88. */ | |
375 | .long 0 /* (User-Defined Vectors 27) CPM Timer 1 - 89. */ | |
376 | .long 0 /* (User-Defined Vectors 28) CPM Parallel IO PC1- 90. */ | |
377 | .long 0 /* (User-Defined Vectors 29) CPM SCC 4 - 91. */ | |
378 | .long 0 /* (User-Defined Vectors 30) CPM SCC 3 - 92. */ | |
379 | .long 0 /* (User-Defined Vectors 31) CPM SCC 2 - 93. */ | |
380 | .long 0 /* (User-Defined Vectors 32) CPM SCC 1 - 94. */ | |
381 | .long 0 /* (User-Defined Vectors 33) CPM Parallel IO PC0- 95. */ | |
382 | /* I don't think anything uses the vectors after here. */ | |
383 | .long 0 /* (User-Defined Vectors 34) - 96. */ | |
384 | .long 0,0,0,0,0 /* (User-Defined Vectors 35 - 39). */ | |
385 | .long 0,0,0,0,0,0,0,0,0,0 /* (User-Defined Vectors 40 - 49). */ | |
386 | .long 0,0,0,0,0,0,0,0,0,0 /* (User-Defined Vectors 50 - 59). */ | |
387 | .long 0,0,0,0,0,0,0,0,0,0 /* (User-Defined Vectors 60 - 69). */ | |
388 | .long 0,0,0,0,0,0,0,0,0,0 /* (User-Defined Vectors 70 - 79). */ | |
389 | .long 0,0,0,0,0,0,0,0,0,0 /* (User-Defined Vectors 80 - 89). */ | |
390 | .long 0,0,0,0,0,0,0,0,0,0 /* (User-Defined Vectors 90 - 99). */ | |
391 | .long 0,0,0,0,0,0,0,0,0,0 /* (User-Defined Vectors 100 - 109). */ | |
392 | .long 0,0,0,0,0,0,0,0,0,0 /* (User-Defined Vectors 110 - 119). */ | |
393 | .long 0,0,0,0,0,0,0,0,0,0 /* (User-Defined Vectors 120 - 129). */ | |
394 | .long 0,0,0,0,0,0,0,0,0,0 /* (User-Defined Vectors 130 - 139). */ | |
395 | .long 0,0,0,0,0,0,0,0,0,0 /* (User-Defined Vectors 140 - 149). */ | |
396 | .long 0,0,0,0,0,0,0,0,0,0 /* (User-Defined Vectors 150 - 159). */ | |
397 | .long 0,0,0,0,0,0,0,0,0,0 /* (User-Defined Vectors 160 - 169). */ | |
398 | .long 0,0,0,0,0,0,0,0,0,0 /* (User-Defined Vectors 170 - 179). */ | |
399 | .long 0,0,0,0,0,0,0,0,0,0 /* (User-Defined Vectors 180 - 189). */ | |
400 | .long 0,0,0 /* (User-Defined Vectors 190 - 192). */ | |
401 | .text | |
402 | ignore: rte |