diff options
author | Michael Hennerich <michael.hennerich@analog.com> | 2007-10-21 04:54:27 -0400 |
---|---|---|
committer | Bryan Wu <bryan.wu@analog.com> | 2007-10-21 04:54:27 -0400 |
commit | 590031450a52c373bf72f5fb156fbcc0c78c6f2c (patch) | |
tree | 0e631bc6e8af9422635535459aaaf10fdddab357 /arch/blackfin/mach-bf527/head.S | |
parent | cfa76f024f7c9e65169425804e5b32e71f66d0ee (diff) |
Blackfin arch: add new processor ADSP-BF52x arch/mach support
Signed-off-by: Michael Hennerich <michael.hennerich@analog.com>
Signed-off-by: Bryan Wu <bryan.wu@analog.com>
Diffstat (limited to 'arch/blackfin/mach-bf527/head.S')
-rw-r--r-- | arch/blackfin/mach-bf527/head.S | 456 |
1 files changed, 456 insertions, 0 deletions
diff --git a/arch/blackfin/mach-bf527/head.S b/arch/blackfin/mach-bf527/head.S new file mode 100644 index 000000000000..cdb00a084965 --- /dev/null +++ b/arch/blackfin/mach-bf527/head.S | |||
@@ -0,0 +1,456 @@ | |||
1 | /* | ||
2 | * File: arch/blackfin/mach-bf527/head.S | ||
3 | * Based on: arch/blackfin/mach-bf533/head.S | ||
4 | * Author: Jeff Dionne <jeff@uclinux.org> COPYRIGHT 1998 D. Jeff Dionne | ||
5 | * | ||
6 | * Created: 1998 | ||
7 | * Description: Startup code for Blackfin BF537 | ||
8 | * | ||
9 | * Modified: | ||
10 | * Copyright 2004-2007 Analog Devices Inc. | ||
11 | * | ||
12 | * Bugs: Enter bugs at http://blackfin.uclinux.org/ | ||
13 | * | ||
14 | * This program is free software; you can redistribute it and/or modify | ||
15 | * it under the terms of the GNU General Public License as published by | ||
16 | * the Free Software Foundation; either version 2 of the License, or | ||
17 | * (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, see the file COPYING, or write | ||
26 | * to the Free Software Foundation, Inc., | ||
27 | * 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA | ||
28 | */ | ||
29 | |||
30 | #include <linux/linkage.h> | ||
31 | #include <linux/init.h> | ||
32 | #include <asm/blackfin.h> | ||
33 | #include <asm/trace.h> | ||
34 | |||
35 | #if CONFIG_BFIN_KERNEL_CLOCK | ||
36 | #include <asm/mach-common/clocks.h> | ||
37 | #include <asm/mach/mem_init.h> | ||
38 | #endif | ||
39 | |||
40 | .global __rambase | ||
41 | .global __ramstart | ||
42 | .global __ramend | ||
43 | .extern ___bss_stop | ||
44 | .extern ___bss_start | ||
45 | .extern _bf53x_relocate_l1_mem | ||
46 | |||
47 | #define INITIAL_STACK 0xFFB01000 | ||
48 | |||
49 | __INIT | ||
50 | |||
51 | ENTRY(__start) | ||
52 | /* R0: argument of command line string, passed from uboot, save it */ | ||
53 | R7 = R0; | ||
54 | /* Enable Cycle Counter and Nesting Of Interrupts */ | ||
55 | #ifdef CONFIG_BFIN_SCRATCH_REG_CYCLES | ||
56 | R0 = SYSCFG_SNEN; | ||
57 | #else | ||
58 | R0 = SYSCFG_SNEN | SYSCFG_CCEN; | ||
59 | #endif | ||
60 | SYSCFG = R0; | ||
61 | R0 = 0; | ||
62 | |||
63 | /* Clear Out All the data and pointer Registers */ | ||
64 | R1 = R0; | ||
65 | R2 = R0; | ||
66 | R3 = R0; | ||
67 | R4 = R0; | ||
68 | R5 = R0; | ||
69 | R6 = R0; | ||
70 | |||
71 | P0 = R0; | ||
72 | P1 = R0; | ||
73 | P2 = R0; | ||
74 | P3 = R0; | ||
75 | P4 = R0; | ||
76 | P5 = R0; | ||
77 | |||
78 | LC0 = r0; | ||
79 | LC1 = r0; | ||
80 | L0 = r0; | ||
81 | L1 = r0; | ||
82 | L2 = r0; | ||
83 | L3 = r0; | ||
84 | |||
85 | /* Clear Out All the DAG Registers */ | ||
86 | B0 = r0; | ||
87 | B1 = r0; | ||
88 | B2 = r0; | ||
89 | B3 = r0; | ||
90 | |||
91 | I0 = r0; | ||
92 | I1 = r0; | ||
93 | I2 = r0; | ||
94 | I3 = r0; | ||
95 | |||
96 | M0 = r0; | ||
97 | M1 = r0; | ||
98 | M2 = r0; | ||
99 | M3 = r0; | ||
100 | |||
101 | trace_buffer_init(p0,r0); | ||
102 | P0 = R1; | ||
103 | R0 = R1; | ||
104 | |||
105 | /* Turn off the icache */ | ||
106 | p0.l = LO(IMEM_CONTROL); | ||
107 | p0.h = HI(IMEM_CONTROL); | ||
108 | R1 = [p0]; | ||
109 | R0 = ~ENICPLB; | ||
110 | R0 = R0 & R1; | ||
111 | |||
112 | /* Anomaly 05000125 */ | ||
113 | #if ANOMALY_05000125 | ||
114 | CLI R2; | ||
115 | SSYNC; | ||
116 | #endif | ||
117 | [p0] = R0; | ||
118 | SSYNC; | ||
119 | #if ANOMALY_05000125 | ||
120 | STI R2; | ||
121 | #endif | ||
122 | |||
123 | /* Turn off the dcache */ | ||
124 | p0.l = LO(DMEM_CONTROL); | ||
125 | p0.h = HI(DMEM_CONTROL); | ||
126 | R1 = [p0]; | ||
127 | R0 = ~ENDCPLB; | ||
128 | R0 = R0 & R1; | ||
129 | |||
130 | /* Anomaly 05000125 */ | ||
131 | #if ANOMALY_05000125 | ||
132 | CLI R2; | ||
133 | SSYNC; | ||
134 | #endif | ||
135 | [p0] = R0; | ||
136 | SSYNC; | ||
137 | #if ANOMALY_05000125 | ||
138 | STI R2; | ||
139 | #endif | ||
140 | |||
141 | |||
142 | #if defined(CONFIG_BF527) | ||
143 | p0.h = hi(EMAC_SYSTAT); | ||
144 | p0.l = lo(EMAC_SYSTAT); | ||
145 | R0.h = 0xFFFF; /* Clear EMAC Interrupt Status bits */ | ||
146 | R0.l = 0xFFFF; | ||
147 | [P0] = R0; | ||
148 | SSYNC; | ||
149 | #endif | ||
150 | |||
151 | /* Initialise UART - when booting from u-boot, the UART is not disabled | ||
152 | * so if we dont initalize here, our serial console gets hosed */ | ||
153 | p0.h = hi(UART1_LCR); | ||
154 | p0.l = lo(UART1_LCR); | ||
155 | r0 = 0x0(Z); | ||
156 | w[p0] = r0.L; /* To enable DLL writes */ | ||
157 | ssync; | ||
158 | |||
159 | p0.h = hi(UART1_DLL); | ||
160 | p0.l = lo(UART1_DLL); | ||
161 | r0 = 0x0(Z); | ||
162 | w[p0] = r0.L; | ||
163 | ssync; | ||
164 | |||
165 | p0.h = hi(UART1_DLH); | ||
166 | p0.l = lo(UART1_DLH); | ||
167 | r0 = 0x00(Z); | ||
168 | w[p0] = r0.L; | ||
169 | ssync; | ||
170 | |||
171 | p0.h = hi(UART1_GCTL); | ||
172 | p0.l = lo(UART1_GCTL); | ||
173 | r0 = 0x0(Z); | ||
174 | w[p0] = r0.L; /* To enable UART clock */ | ||
175 | ssync; | ||
176 | |||
177 | /* Initialize stack pointer */ | ||
178 | sp.l = lo(INITIAL_STACK); | ||
179 | sp.h = hi(INITIAL_STACK); | ||
180 | fp = sp; | ||
181 | usp = sp; | ||
182 | |||
183 | #ifdef CONFIG_EARLY_PRINTK | ||
184 | SP += -12; | ||
185 | call _init_early_exception_vectors; | ||
186 | SP += 12; | ||
187 | #endif | ||
188 | |||
189 | /* Put The Code for PLL Programming and SDRAM Programming in L1 ISRAM */ | ||
190 | call _bf53x_relocate_l1_mem; | ||
191 | #if CONFIG_BFIN_KERNEL_CLOCK | ||
192 | call _start_dma_code; | ||
193 | #endif | ||
194 | |||
195 | /* Code for initializing Async memory banks */ | ||
196 | |||
197 | p2.h = hi(EBIU_AMBCTL1); | ||
198 | p2.l = lo(EBIU_AMBCTL1); | ||
199 | r0.h = hi(AMBCTL1VAL); | ||
200 | r0.l = lo(AMBCTL1VAL); | ||
201 | [p2] = r0; | ||
202 | ssync; | ||
203 | |||
204 | p2.h = hi(EBIU_AMBCTL0); | ||
205 | p2.l = lo(EBIU_AMBCTL0); | ||
206 | r0.h = hi(AMBCTL0VAL); | ||
207 | r0.l = lo(AMBCTL0VAL); | ||
208 | [p2] = r0; | ||
209 | ssync; | ||
210 | |||
211 | p2.h = hi(EBIU_AMGCTL); | ||
212 | p2.l = lo(EBIU_AMGCTL); | ||
213 | r0 = AMGCTLVAL; | ||
214 | w[p2] = r0; | ||
215 | ssync; | ||
216 | |||
217 | /* This section keeps the processor in supervisor mode | ||
218 | * during kernel boot. Switches to user mode at end of boot. | ||
219 | * See page 3-9 of Hardware Reference manual for documentation. | ||
220 | */ | ||
221 | |||
222 | /* EVT15 = _real_start */ | ||
223 | |||
224 | p0.l = lo(EVT15); | ||
225 | p0.h = hi(EVT15); | ||
226 | p1.l = _real_start; | ||
227 | p1.h = _real_start; | ||
228 | [p0] = p1; | ||
229 | csync; | ||
230 | |||
231 | p0.l = lo(IMASK); | ||
232 | p0.h = hi(IMASK); | ||
233 | p1.l = IMASK_IVG15; | ||
234 | p1.h = 0x0; | ||
235 | [p0] = p1; | ||
236 | csync; | ||
237 | |||
238 | raise 15; | ||
239 | p0.l = .LWAIT_HERE; | ||
240 | p0.h = .LWAIT_HERE; | ||
241 | reti = p0; | ||
242 | #if ANOMALY_05000281 | ||
243 | nop; nop; nop; | ||
244 | #endif | ||
245 | rti; | ||
246 | |||
247 | .LWAIT_HERE: | ||
248 | jump .LWAIT_HERE; | ||
249 | ENDPROC(__start) | ||
250 | |||
251 | ENTRY(_real_start) | ||
252 | [ -- sp ] = reti; | ||
253 | p0.l = lo(WDOG_CTL); | ||
254 | p0.h = hi(WDOG_CTL); | ||
255 | r0 = 0xAD6(z); | ||
256 | w[p0] = r0; /* watchdog off for now */ | ||
257 | ssync; | ||
258 | |||
259 | /* Code update for BSS size == 0 | ||
260 | * Zero out the bss region. | ||
261 | */ | ||
262 | |||
263 | p1.l = ___bss_start; | ||
264 | p1.h = ___bss_start; | ||
265 | p2.l = ___bss_stop; | ||
266 | p2.h = ___bss_stop; | ||
267 | r0 = 0; | ||
268 | p2 -= p1; | ||
269 | lsetup (.L_clear_bss, .L_clear_bss) lc0 = p2; | ||
270 | .L_clear_bss: | ||
271 | B[p1++] = r0; | ||
272 | |||
273 | /* In case there is a NULL pointer reference | ||
274 | * Zero out region before stext | ||
275 | */ | ||
276 | |||
277 | p1.l = 0x0; | ||
278 | p1.h = 0x0; | ||
279 | r0.l = __stext; | ||
280 | r0.h = __stext; | ||
281 | r0 = r0 >> 1; | ||
282 | p2 = r0; | ||
283 | r0 = 0; | ||
284 | lsetup (.L_clear_zero, .L_clear_zero) lc0 = p2; | ||
285 | .L_clear_zero: | ||
286 | W[p1++] = r0; | ||
287 | |||
288 | /* pass the uboot arguments to the global value command line */ | ||
289 | R0 = R7; | ||
290 | call _cmdline_init; | ||
291 | |||
292 | p1.l = __rambase; | ||
293 | p1.h = __rambase; | ||
294 | r0.l = __sdata; | ||
295 | r0.h = __sdata; | ||
296 | [p1] = r0; | ||
297 | |||
298 | p1.l = __ramstart; | ||
299 | p1.h = __ramstart; | ||
300 | p3.l = ___bss_stop; | ||
301 | p3.h = ___bss_stop; | ||
302 | |||
303 | r1 = p3; | ||
304 | [p1] = r1; | ||
305 | |||
306 | /* | ||
307 | * load the current thread pointer and stack | ||
308 | */ | ||
309 | r1.l = _init_thread_union; | ||
310 | r1.h = _init_thread_union; | ||
311 | |||
312 | r2.l = 0x2000; | ||
313 | r2.h = 0x0000; | ||
314 | r1 = r1 + r2; | ||
315 | sp = r1; | ||
316 | usp = sp; | ||
317 | fp = sp; | ||
318 | jump.l _start_kernel; | ||
319 | ENDPROC(_real_start) | ||
320 | |||
321 | __FINIT | ||
322 | |||
323 | .section .l1.text | ||
324 | #if CONFIG_BFIN_KERNEL_CLOCK | ||
325 | ENTRY(_start_dma_code) | ||
326 | |||
327 | /* Enable PHY CLK buffer output */ | ||
328 | p0.h = hi(VR_CTL); | ||
329 | p0.l = lo(VR_CTL); | ||
330 | r0.l = w[p0]; | ||
331 | bitset(r0, 14); | ||
332 | w[p0] = r0.l; | ||
333 | ssync; | ||
334 | |||
335 | p0.h = hi(SIC_IWR0); | ||
336 | p0.l = lo(SIC_IWR0); | ||
337 | r0.l = 0x1; | ||
338 | r0.h = 0x0; | ||
339 | [p0] = r0; | ||
340 | SSYNC; | ||
341 | |||
342 | /* | ||
343 | * Set PLL_CTL | ||
344 | * - [14:09] = MSEL[5:0] : CLKIN / VCO multiplication factors | ||
345 | * - [8] = BYPASS : BYPASS the PLL, run CLKIN into CCLK/SCLK | ||
346 | * - [7] = output delay (add 200ps of delay to mem signals) | ||
347 | * - [6] = input delay (add 200ps of input delay to mem signals) | ||
348 | * - [5] = PDWN : 1=All Clocks off | ||
349 | * - [3] = STOPCK : 1=Core Clock off | ||
350 | * - [1] = PLL_OFF : 1=Disable Power to PLL | ||
351 | * - [0] = DF : 1=Pass CLKIN/2 to PLL / 0=Pass CLKIN to PLL | ||
352 | * all other bits set to zero | ||
353 | */ | ||
354 | |||
355 | p0.h = hi(PLL_LOCKCNT); | ||
356 | p0.l = lo(PLL_LOCKCNT); | ||
357 | r0 = 0x300(Z); | ||
358 | w[p0] = r0.l; | ||
359 | ssync; | ||
360 | |||
361 | P2.H = hi(EBIU_SDGCTL); | ||
362 | P2.L = lo(EBIU_SDGCTL); | ||
363 | R0 = [P2]; | ||
364 | BITSET (R0, 24); | ||
365 | [P2] = R0; | ||
366 | SSYNC; | ||
367 | |||
368 | r0 = CONFIG_VCO_MULT & 63; /* Load the VCO multiplier */ | ||
369 | r0 = r0 << 9; /* Shift it over, */ | ||
370 | r1 = CLKIN_HALF; /* Do we need to divide CLKIN by 2?*/ | ||
371 | r0 = r1 | r0; | ||
372 | r1 = PLL_BYPASS; /* Bypass the PLL? */ | ||
373 | r1 = r1 << 8; /* Shift it over */ | ||
374 | r0 = r1 | r0; /* add them all together */ | ||
375 | |||
376 | p0.h = hi(PLL_CTL); | ||
377 | p0.l = lo(PLL_CTL); /* Load the address */ | ||
378 | cli r2; /* Disable interrupts */ | ||
379 | ssync; | ||
380 | w[p0] = r0.l; /* Set the value */ | ||
381 | idle; /* Wait for the PLL to stablize */ | ||
382 | sti r2; /* Enable interrupts */ | ||
383 | |||
384 | .Lcheck_again: | ||
385 | p0.h = hi(PLL_STAT); | ||
386 | p0.l = lo(PLL_STAT); | ||
387 | R0 = W[P0](Z); | ||
388 | CC = BITTST(R0,5); | ||
389 | if ! CC jump .Lcheck_again; | ||
390 | |||
391 | /* Configure SCLK & CCLK Dividers */ | ||
392 | r0 = (CONFIG_CCLK_ACT_DIV | CONFIG_SCLK_DIV); | ||
393 | p0.h = hi(PLL_DIV); | ||
394 | p0.l = lo(PLL_DIV); | ||
395 | w[p0] = r0.l; | ||
396 | ssync; | ||
397 | |||
398 | p0.l = lo(EBIU_SDRRC); | ||
399 | p0.h = hi(EBIU_SDRRC); | ||
400 | r0 = mem_SDRRC; | ||
401 | w[p0] = r0.l; | ||
402 | ssync; | ||
403 | |||
404 | p0.l = LO(EBIU_SDBCTL); | ||
405 | p0.h = HI(EBIU_SDBCTL); /* SDRAM Memory Bank Control Register */ | ||
406 | r0 = mem_SDBCTL; | ||
407 | w[p0] = r0.l; | ||
408 | ssync; | ||
409 | |||
410 | P2.H = hi(EBIU_SDGCTL); | ||
411 | P2.L = lo(EBIU_SDGCTL); | ||
412 | R0 = [P2]; | ||
413 | BITCLR (R0, 24); | ||
414 | p0.h = hi(EBIU_SDSTAT); | ||
415 | p0.l = lo(EBIU_SDSTAT); | ||
416 | r2.l = w[p0]; | ||
417 | cc = bittst(r2,3); | ||
418 | if !cc jump .Lskip; | ||
419 | NOP; | ||
420 | BITSET (R0, 23); | ||
421 | .Lskip: | ||
422 | [P2] = R0; | ||
423 | SSYNC; | ||
424 | |||
425 | R0.L = lo(mem_SDGCTL); | ||
426 | R0.H = hi(mem_SDGCTL); | ||
427 | R1 = [p2]; | ||
428 | R1 = R1 | R0; | ||
429 | [P2] = R1; | ||
430 | SSYNC; | ||
431 | |||
432 | p0.h = hi(SIC_IWR0); | ||
433 | p0.l = lo(SIC_IWR0); | ||
434 | r0.l = lo(IWR_ENABLE_ALL); | ||
435 | r0.h = hi(IWR_ENABLE_ALL); | ||
436 | [p0] = r0; | ||
437 | SSYNC; | ||
438 | |||
439 | RTS; | ||
440 | ENDPROC(_start_dma_code) | ||
441 | #endif /* CONFIG_BFIN_KERNEL_CLOCK */ | ||
442 | |||
443 | .data | ||
444 | |||
445 | /* | ||
446 | * Set up the usable of RAM stuff. Size of RAM is determined then | ||
447 | * an initial stack set up at the end. | ||
448 | */ | ||
449 | |||
450 | .align 4 | ||
451 | __rambase: | ||
452 | .long 0 | ||
453 | __ramstart: | ||
454 | .long 0 | ||
455 | __ramend: | ||
456 | .long 0 | ||