summaryrefslogtreecommitdiffstats
path: root/board/xaeniax/lowlevel_init.S
blob: 57e16200501a6ec2a55bf77d32ff98d1a3932d6c (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
 /*
 * Most of this taken from Redboot hal_platform_setup.h with cleanup
 *
 * NOTE: I haven't clean this up considerably, just enough to get it
 * running. See hal_platform_setup.h for the source. See
 * board/cradle/lowlevel_init.S for another PXA250 setup that is
 * much cleaner.
 *
 * See file CREDITS for list of people who contributed to this
 * project.
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License as
 * published by the Free Software Foundation; either version 2 of
 * the License, or (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place, Suite 330, Boston,
 * MA 02111-1307 USA
 */

#include <config.h>
#include <version.h>
#include <asm/arch/pxa-regs.h>

DRAM_SIZE:  .long   CONFIG_SYS_DRAM_SIZE

/* wait for coprocessor write complete */
	.macro CPWAIT reg
	mrc  p15,0,\reg,c2,c0,0
	mov  \reg,\reg
	sub  pc,pc,#4
	.endm


.globl lowlevel_init
lowlevel_init:

	mov	 r10, lr

	/* Set up GPIO pins first ----------------------------------------- */

	ldr	r0,=GPSR0
	ldr	r1,=CONFIG_SYS_GPSR0_VAL
	str	r1,[r0]

	ldr	r0,=GPSR1
	ldr	r1,=CONFIG_SYS_GPSR1_VAL
	str	r1,[r0]

	ldr	r0,=GPSR2
	ldr	r1,=CONFIG_SYS_GPSR2_VAL
	str	r1,[r0]

	ldr	r0,=GPCR0
	ldr	r1,=CONFIG_SYS_GPCR0_VAL
	str	r1,[r0]

	ldr	r0,=GPCR1
	ldr	r1,=CONFIG_SYS_GPCR1_VAL
	str	r1,[r0]

	ldr	r0,=GPCR2
	ldr	r1,=CONFIG_SYS_GPCR2_VAL
	str	r1,[r0]

	ldr	r0,=GPDR0
	ldr	r1,=CONFIG_SYS_GPDR0_VAL
	str	r1,[r0]

	ldr	r0,=GPDR1
	ldr	r1,=CONFIG_SYS_GPDR1_VAL
	str	r1,[r0]

	ldr	r0,=GPDR2
	ldr	r1,=CONFIG_SYS_GPDR2_VAL
	str	r1,[r0]

	ldr	r0,=GAFR0_L
	ldr	r1,=CONFIG_SYS_GAFR0_L_VAL
	str	r1,[r0]

	ldr	r0,=GAFR0_U
	ldr	r1,=CONFIG_SYS_GAFR0_U_VAL
	str	r1,[r0]

	ldr	r0,=GAFR1_L
	ldr	r1,=CONFIG_SYS_GAFR1_L_VAL
	str	r1,[r0]

	ldr	r0,=GAFR1_U
	ldr	r1,=CONFIG_SYS_GAFR1_U_VAL
	str	r1,[r0]

	ldr	r0,=GAFR2_L
	ldr	r1,=CONFIG_SYS_GAFR2_L_VAL
	str	r1,[r0]

	ldr	r0,=GAFR2_U
	ldr	r1,=CONFIG_SYS_GAFR2_U_VAL
	str	r1,[r0]

	ldr	r0,=PSSR		/* enable GPIO pins */
	ldr	r1,=CONFIG_SYS_PSSR_VAL
	str	r1,[r0]

	/* ---------------------------------------------------------------- */
	/* Enable memory interface                                          */
	/*                                                                  */
	/* The sequence below is based on the recommended init steps        */
	/* detailed in the Intel PXA250 Operating Systems Developers Guide, */
	/* Chapter 10.                                                      */
	/* ---------------------------------------------------------------- */

	/* ---------------------------------------------------------------- */
	/* Step 1: Wait for at least 200 microsedonds to allow internal     */
	/*         clocks to settle. Only necessary after hard reset...     */
	/*         FIXME: can be optimized later                            */
	/* ---------------------------------------------------------------- */

	ldr	r3, =OSCR		/* reset the OS Timer Count to zero */
	mov	r2, #0
	str	r2, [r3]
	ldr	r4, =0x300		/* really 0x2E1 is about 200usec,   */
					/* so 0x300 should be plenty        */
1:
	ldr	r2, [r3]
	cmp	r4, r2
	bgt	1b

mem_init:

	ldr	r1,=MEMC_BASE		/* get memory controller base addr. */

	/* ---------------------------------------------------------------- */
	/* Step 2a: Initialize Asynchronous static memory controller        */
	/* ---------------------------------------------------------------- */

	/* MSC registers: timing, bus width, mem type                       */

	/* MSC0: nCS(0,1)                                                   */
	ldr     r2,=CONFIG_SYS_MSC0_VAL
	str     r2,[r1, #MSC0_OFFSET]
	ldr     r2,[r1, #MSC0_OFFSET]	/* read back to ensure data latches */

	/* MSC1: nCS(2,3)                                                   */
	ldr     r2,=CONFIG_SYS_MSC1_VAL
	str     r2,[r1, #MSC1_OFFSET]
	ldr     r2,[r1, #MSC1_OFFSET]

	/* MSC2: nCS(4,5)                                                   */
	ldr     r2,=CONFIG_SYS_MSC2_VAL
	str     r2,[r1, #MSC2_OFFSET]
	ldr     r2,[r1, #MSC2_OFFSET]

	/* ---------------------------------------------------------------- */
	/* Step 2b: Initialize Card Interface                               */
	/* ---------------------------------------------------------------- */

	/* MECR: Memory Expansion Card Register                             */
	ldr     r2,=CONFIG_SYS_MECR_VAL
	str     r2,[r1, #MECR_OFFSET]
	ldr	r2,[r1, #MECR_OFFSET]

	/* MCMEM0: Card Interface slot 0 timing                             */
	ldr     r2,=CONFIG_SYS_MCMEM0_VAL
	str     r2,[r1, #MCMEM0_OFFSET]
	ldr	r2,[r1, #MCMEM0_OFFSET]

	/* MCMEM1: Card Interface slot 1 timing                             */
	ldr     r2,=CONFIG_SYS_MCMEM1_VAL
	str     r2,[r1, #MCMEM1_OFFSET]
	ldr	r2,[r1, #MCMEM1_OFFSET]

	/* MCATT0: Card Interface Attribute Space Timing, slot 0            */
	ldr     r2,=CONFIG_SYS_MCATT0_VAL
	str     r2,[r1, #MCATT0_OFFSET]
	ldr	r2,[r1, #MCATT0_OFFSET]

	/* MCATT1: Card Interface Attribute Space Timing, slot 1            */
	ldr     r2,=CONFIG_SYS_MCATT1_VAL
	str     r2,[r1, #MCATT1_OFFSET]
	ldr	r2,[r1, #MCATT1_OFFSET]

	/* MCIO0: Card Interface I/O Space Timing, slot 0                   */
	ldr     r2,=CONFIG_SYS_MCIO0_VAL
	str     r2,[r1, #MCIO0_OFFSET]
	ldr	r2,[r1, #MCIO0_OFFSET]

	/* MCIO1: Card Interface I/O Space Timing, slot 1                   */
	ldr     r2,=CONFIG_SYS_MCIO1_VAL
	str     r2,[r1, #MCIO1_OFFSET]
	ldr	r2,[r1, #MCIO1_OFFSET]

	/* ---------------------------------------------------------------- */
	/* Step 2c: Write FLYCNFG  FIXME: what's that???                    */
	/* ---------------------------------------------------------------- */

	/* ---------------------------------------------------------------- */
	/* Step 2d: Initialize Timing for Sync Memory (SDCLK0)              */
	/* ---------------------------------------------------------------- */

	@ get the mdrefr settings
	ldr     r4,=CONFIG_SYS_MDREFR_VAL

	@ write back mdrefr
	str     r4,[r1, #MDREFR_OFFSET]
	ldr     r4,[r1, #MDREFR_OFFSET]

	/* ---------------------------------------------------------------- */
	/* Step 3: Initialize Synchronous Static Memory (Flash/Peripherals) */
	/* ---------------------------------------------------------------- */

	/* Initialize SXCNFG register. Assert the enable bits               */

	/* Write SXMRS to cause an MRS command to all enabled banks of      */
	/* synchronous static memory. Note that SXLCR need not be written   */
	/* at this time.                                                    */

	/* FIXME: we use async mode for now                                 */

	/* ---------------------------------------------------------------- */
	/* Step 4: Initialize SDRAM                                         */
	/* ---------------------------------------------------------------- */

	@ set K1RUN for bank 0
	@
	orr   r4,  r4,  #MDREFR_K1RUN

	@ write back mdrefr
	@
	str     r4,  [r1, #MDREFR_OFFSET]
	ldr     r4,  [r1, #MDREFR_OFFSET]

	@ deassert SLFRSH
	@
	bic     r4,  r4,  #MDREFR_SLFRSH

	@ write back mdrefr
	@
	str     r4,  [r1, #MDREFR_OFFSET]
	ldr     r4,  [r1, #MDREFR_OFFSET]

	@ assert E1PIN
	@ if E0PIN is also used:	 #(MDREFR_E1PIN|MDREFR_E0PIN)
	orr     r4,  r4, #(MDREFR_E1PIN)

	@ write back mdrefr
	@
	str     r4,  [r1, #MDREFR_OFFSET]
	ldr     r4,  [r1, #MDREFR_OFFSET]
	nop
	nop

	/* Step 4d:							*/
	/* fetch platform value of mdcnfg				*/
	@
	ldr     r2,  =CONFIG_SYS_MDCNFG_VAL

	@ disable all sdram banks
	@
	bic     r2,  r2,  #(MDCNFG_DE0 | MDCNFG_DE1)
	bic     r2,  r2,  #(MDCNFG_DE2 | MDCNFG_DE3)

	@ program banks 0/1 for bus width
	@
	bic   r2,  r2,  #MDCNFG_DWID0      @0=32-bit

	@ write initial value of mdcnfg, w/o enabling sdram banks
	@
	str     r2,  [r1, #MDCNFG_OFFSET]

	/* Step 4e: Wait for the clock to the SDRAMs to stabilize,          */
	/*          100..200 µsec.                                          */

	ldr	r3, =OSCR		/* reset the OS Timer Count to zero */
	mov	r2, #0
	str	r2, [r3]
	ldr	r4, =0x300		/* really 0x2E1 is about 200usec,   */
					/* so 0x300 should be plenty        */
1:
	ldr	r2, [r3]
	cmp	r4, r2
	bgt	1b


	/* Step 4f: Trigger a number (usually 8) refresh cycles by          */
	/*          attempting non-burst read or write accesses to disabled */
	/*          SDRAM, as commonly specified in the power up sequence   */
	/*          documented in SDRAM data sheets. The address(es) used   */
	/*          for this purpose must not be cacheable.                 */

	ldr	r3,	=CONFIG_SYS_DRAM_BASE
	str	r2,	[r3]
	str	r2,	[r3]
	str	r2,	[r3]
	str	r2,	[r3]
	str	r2,	[r3]
	str	r2,	[r3]
	str	r2,	[r3]
	str	r2,	[r3]
	str	r2,	[r3]


	/* Step 4g: Write MDCNFG with enable bits asserted                  */
	/* get memory controller base address                               */
	ldr     r1,  =MEMC_BASE

	@fetch current mdcnfg value
	@
	ldr     r3,  [r1, #MDCNFG_OFFSET]

	@enable sdram bank 0 if installed (must do for any populated bank)
	@
	orr     r3,  r3,  #MDCNFG_DE0

	@write back mdcnfg, enabling the sdram bank(s)
	@
	str     r3,  [r1, #MDCNFG_OFFSET]

	/* Step 4h: Write MDMRS.                                            */

	ldr     r2,	=CONFIG_SYS_MDMRS_VAL
	str     r2,	[r1, #MDMRS_OFFSET]


	/* We are finished with Intel's memory controller initialisation    */


	/* ---------------------------------------------------------------- */
	/* Disable (mask) all interrupts at interrupt controller            */
	/* ---------------------------------------------------------------- */

initirqs:
	mov     r1, #0		/* clear int. level register (IRQ, not FIQ) */
	ldr     r2,  =ICLR
	str     r1,  [r2]

	ldr     r1,  =CONFIG_SYS_ICMR_VAL /* mask all interrupts at the controller */
	ldr     r2,  =ICMR
	str     r1,  [r2]


	/* ---------------------------------------------------------------- */
	/* Clock initialisation                                             */
	/* ---------------------------------------------------------------- */

initclks:

	/* Disable the peripheral clocks, and set the core clock frequency  */
	/* (hard-coding at 398.12MHz for now).                              */
	/* Turn Off ALL on-chip peripheral clocks for re-configuration      */
	/* Note: See label 'ENABLECLKS' for the re-enabling                 */
	ldr     r1,  =CKEN
	mov     r2,  #0
	str     r2,  [r1]


	/* default value						    */
	ldr     r2, =(CCCR_L27|CCCR_M2|CCCR_N10)  /* DEFAULT: {200/200/100} */

	/* ... and write the core clock config register                     */
	ldr     r1,  =CCCR
	str     r2,  [r1]

#ifdef RTC
	/* enable the 32Khz oscillator for RTC and PowerManager             */

	ldr     r1,  =OSCC
	mov     r2,  #OSCC_OON
	str     r2,  [r1]

	/* NOTE:  spin here until OSCC.OOK get set, meaning the PLL         */
	/* has settled.                                                     */
60:
	ldr     r2, [r1]
	ands    r2, r2, #1
	beq     60b
#endif

	@ Turn on needed clocks
	@
test:
	ldr     r1,  =CKEN
	ldr     r2,  =CONFIG_SYS_CKEN_VAL
	str     r2,  [r1]

	/* ---------------------------------------------------------------- */
	/*                                                                  */
	/* ---------------------------------------------------------------- */

	/* Save SDRAM size ?*/
	ldr	r1, =DRAM_SIZE
	str	r8, [r1]

	/* FIXME */

#define NODEBUG
#ifdef NODEBUG
	/*Disable software and data breakpoints */
	mov	r0,#0
	mcr	p15,0,r0,c14,c8,0  /* ibcr0 */
	mcr	p15,0,r0,c14,c9,0  /* ibcr1 */
	mcr	p15,0,r0,c14,c4,0  /* dbcon */

	/*Enable all debug functionality */
	mov	r0,#0x80000000
	mcr	p14,0,r0,c10,c0,0  /* dcsr */

#endif

	/* ---------------------------------------------------------------- */
	/* End lowlevel_init                                                     */
	/* ---------------------------------------------------------------- */

endlowlevel_init:

	mov     pc, lr
OpenPOWER on IntegriCloud