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
|
/*
* 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 CFG_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
.macro wait time
ldr r2, =OSCR
mov r3, #0
str r3, [r2]
0:
ldr r3, [r2]
cmp r3, \time
bls 0b
.endm
/*
* Memory setup
*/
.globl lowlevel_init
lowlevel_init:
/* Set up GPIO pins first ----------------------------------------- */
mov r10, lr
/* Configure GPIO Pins 41 - 48 as UART1 / altern. Fkt. 2 */
ldr r0, =0x40E10438 @ GPIO41 FFRXD
ldr r1, =0x802
str r1, [r0]
ldr r0, =0x40E1043C @ GPIO42 FFTXD
ldr r1, =0x802
str r1, [r0]
ldr r0, =0x40E10440 @ GPIO43 FFCTS
ldr r1, =0x802
str r1, [r0]
ldr r0, =0x40E10444 @ GPIO 44 FFDCD
ldr r1, =0x802
str r1, [r0]
ldr r0, =0x40E10448 @ GPIO 45 FFDSR
ldr r1, =0x802
str r1, [r0]
ldr r0, =0x40E1044C @ GPIO 46 FFRI
ldr r1, =0x802
str r1, [r0]
ldr r0, =0x40E10450 @ GPIO 47 FFDTR
ldr r1, =0x802
str r1, [r0]
ldr r0, =0x40E10454 @ GPIO 48
ldr r1, =0x802
str r1, [r0]
/* tebrandt - ASCR, clear the RDH bit */
ldr r0, =ASCR
ldr r1, [r0]
bic r1, r1, #0x80000000
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 */
/* ---------------------------------------------------------------- */
/* mk: replaced with wait macro */
/* 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 */
wait #300
mem_init:
/* configure the MEMCLKCFG register */
ldr r1, =MEMCLKCFG
ldr r2, =0x00010001
str r2, [r1] @ WRITE
ldr r2, [r1] @ DELAY UNTIL WRITTEN
/* set CSADRCFG[0] to data flash SRAM mode */
ldr r1, =CSADRCFG0
ldr r2, =0x00320809
str r2, [r1] @ WRITE
ldr r2, [r1] @ DELAY UNTIL WRITTEN
/* set CSADRCFG[1] to data flash SRAM mode */
ldr r1, =CSADRCFG1
ldr r2, =0x00320809
str r2, [r1] @ WRITE
ldr r2, [r1] @ DELAY UNTIL WRITTEN
/* set MSC 0 register for SRAM memory */
ldr r1, =MSC0
ldr r2, =0x11191119
str r2, [r1] @ WRITE
ldr r2, [r1] @ DELAY UNTIL WRITTEN
/* set CSADRCFG[2] to data flash SRAM mode */
ldr r1, =CSADRCFG2
ldr r2, =0x00320809
str r2, [r1] @ WRITE
ldr r2, [r1] @ DELAY UNTIL WRITTEN
/* set CSADRCFG[3] to VLIO mode */
ldr r1, =CSADRCFG3
ldr r2, =0x0032080B
str r2, [r1] @ WRITE
ldr r2, [r1] @ DELAY UNTIL WRITTEN
/* set MSC 1 register for VLIO memory */
ldr r1, =MSC1
ldr r2, =0x123C1119
str r2, [r1] @ WRITE
ldr r2, [r1] @ DELAY UNTIL WRITTEN
#if 0
/* This does not work in Zylonite. -SC */
ldr r0, =0x15fffff0
ldr r1, =0xb10b
str r1, [r0]
str r1, [r0, #4]
#endif
/* Configure ACCR Register */
ldr r0, =ACCR @ ACCR
ldr r1, =0x0180b108
str r1, [r0]
ldr r1, [r0]
/* Configure MDCNFG Register */
ldr r0, =MDCNFG @ MDCNFG
ldr r1, =0x403
str r1, [r0]
ldr r1, [r0]
/* Perform Resistive Compensation by configuring RCOMP register */
ldr r1, =RCOMP @ RCOMP
ldr r2, =0x000000ff
str r2, [r1]
ldr r2, [r1]
/* Configure MDMRS Register for SDCS0 */
ldr r1, =MDMRS @ MDMRS
ldr r2, =0x60000023
ldr r3, [r1]
orr r2, r2, r3
str r2, [r1]
ldr r2, [r1]
/* Configure MDMRS Register for SDCS1 */
ldr r1, =MDMRS @ MDMRS
ldr r2, =0xa0000023
ldr r3, [r1]
orr r2, r2, r3
str r2, [r1]
ldr r2, [r1]
/* Configure MDREFR */
ldr r1, =MDREFR @ MDREFR
ldr r2, =0x00000006
str r2, [r1]
ldr r2, [r1]
/* Configure EMPI */
ldr r1, =EMPI @ EMPI
ldr r2, =0x80000000
str r2, [r1]
ldr r2, [r1]
/* Hardware DDR Read-Strobe Delay Calibration */
ldr r0, =DDR_HCAL @ DDR_HCAL
ldr r1, =0x803ffc07 @ the offset is correct? -SC
str r1, [r0]
wait #5
ldr r1, [r0]
/* Here we assume the hardware calibration alwasy be successful. -SC */
/* Set DMCEN bit in MDCNFG Register */
ldr r0, =MDCNFG @ MDCNFG
ldr r1, [r0]
orr r1, r1, #0x40000000 @ enable SDRAM for Normal Access
str r1, [r0]
#ifndef CFG_SKIP_DRAM_SCRUB
/* scrub/init SDRAM if enabled/present */
/* ldr r11, =0xa0000000 /\* base address of SDRAM (CFG_DRAM_BASE) *\/ */
/* ldr r12, =0x04000000 /\* size of memory to scrub (CFG_DRAM_SIZE) *\/ */
/* mov r8,r12 /\* save DRAM size (mk: why???) *\/ */
ldr r8, =0xa0000000 /* base address of SDRAM (CFG_DRAM_BASE) */
ldr r9, =0x04000000 /* size of memory to scrub (CFG_DRAM_SIZE) */
mov r0, #0 /* scrub with 0x0000:0000 */
mov r1, #0
mov r2, #0
mov r3, #0
mov r4, #0
mov r5, #0
mov r6, #0
mov r7, #0
10: /* fastScrubLoop */
subs r9, r9, #32 /* 32 bytes/line */
stmia r8!, {r0-r7}
beq 15f
b 10b
#endif /* CFG_SKIP_DRAM_SCRUB */
15:
/* Mask all interrupts */
mov r1, #0
mcr p6, 0, r1, c1, c0, 0 @ ICMR
/* 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 */
/* We are finished with Intel's memory controller initialisation */
/* ---------------------------------------------------------------- */
/* End lowlevel_init */
/* ---------------------------------------------------------------- */
endlowlevel_init:
mov pc, lr
/*
@********************************************************************************
@ DDR calibration
@
@ This function is used to calibrate DQS delay lines.
@ Monahans supports three ways to do it. One is software
@ calibration. Two is hardware calibration. Three is hybrid
@ calibration.
@
@ TBD
@ -SC
ddr_calibration:
@ Case 1: Write the correct delay value once
@ Configure DDR_SCAL Register
ldr r0, =DDR_SCAL @ DDR_SCAL
q ldr r1, =0xaf2f2f2f
str r1, [r0]
ldr r1, [r0]
*/
/* @ Case 2: Software Calibration
@ Write test pattern to memory
ldr r5, =0x0faf0faf @ Data Pattern
ldr r4, =0xa0000000 @ DDR ram
str r5, [r4]
mov r1, =0x0 @ delay count
mov r6, =0x0
mov r7, =0x0
ddr_loop1:
add r1, r1, =0x1
cmp r1, =0xf
ble end_loop
mov r3, r1
mov r0, r1, lsl #30
orr r3, r3, r0
mov r0, r1, lsl #22
orr r3, r3, r0
mov r0, r1, lsl #14
orr r3, r3, r0
orr r3, r3, =0x80000000
ldr r2, =DDR_SCAL
str r3, [r2]
ldr r2, [r4]
cmp r2, r5
bne ddr_loop1
mov r6, r1
ddr_loop2:
add r1, r1, =0x1
cmp r1, =0xf
ble end_loop
mov r3, r1
mov r0, r1, lsl #30
orr r3, r3, r0
mov r0, r1, lsl #22
orr r3, r3, r0
mov r0, r1, lsl #14
orr r3, r3, r0
orr r3, r3, =0x80000000
ldr r2, =DDR_SCAL
str r3, [r2]
ldr r2, [r4]
cmp r2, r5
be ddr_loop2
mov r7, r2
add r3, r6, r7
lsr r3, r3, =0x1
mov r0, r1, lsl #30
orr r3, r3, r0
mov r0, r1, lsl #22
orr r3, r3, r0
mov r0, r1, lsl #14
orr r3, r3, r0
orr r3, r3, =0x80000000
ldr r2, =DDR_SCAL
end_loop:
@ Case 3: Hardware Calibratoin
ldr r0, =DDR_HCAL @ DDR_HCAL
ldr r1, =0x803ffc07 @ the offset is correct? -SC
str r1, [r0]
wait #5
ldr r1, [r0]
mov pc, lr
*/
|
