aboutsummaryrefslogtreecommitdiffstats
path: root/arch/frv/kernel/head-mmu-fr451.S
blob: 98f87d586e598ec77465c1e1a9eb140d13257d05 (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
/* head-mmu-fr451.S: FR451 mmu-linux specific bits of initialisation
 *
 * Copyright (C) 2004 Red Hat, Inc. All Rights Reserved.
 * Written by David Howells (dhowells@redhat.com)
 *
 * 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.
 */

#include <linux/init.h>
#include <linux/threads.h>
#include <linux/linkage.h>
#include <asm/ptrace.h>
#include <asm/page.h>
#include <asm/mem-layout.h>
#include <asm/spr-regs.h>
#include <asm/mb86943a.h>
#include "head.inc"


#define __400_DBR0	0xfe000e00
#define __400_DBR1	0xfe000e08
#define __400_DBR2	0xfe000e10
#define __400_DBR3	0xfe000e18
#define __400_DAM0	0xfe000f00
#define __400_DAM1	0xfe000f08
#define __400_DAM2	0xfe000f10
#define __400_DAM3	0xfe000f18
#define __400_LGCR	0xfe000010
#define __400_LCR	0xfe000100
#define __400_LSBR	0xfe000c00

	__INIT
	.balign		4

###############################################################################
#
# describe the position and layout of the SDRAM controller registers
#
#	ENTRY:			EXIT:
# GR5	-			cacheline size
# GR11	-			displacement of 2nd SDRAM addr reg from GR14
# GR12	-			displacement of 3rd SDRAM addr reg from GR14
# GR13	-			displacement of 4th SDRAM addr reg from GR14
# GR14	-			address of 1st SDRAM addr reg
# GR15	-			amount to shift address by to match SDRAM addr reg
# GR26	&__head_reference	[saved]
# GR30	LED address		[saved]
# CC0	-			T if DBR0 is present
# CC1	-			T if DBR1 is present
# CC2	-			T if DBR2 is present
# CC3	-			T if DBR3 is present
#
###############################################################################
	.globl		__head_fr451_describe_sdram
__head_fr451_describe_sdram:
	sethi.p		%hi(__400_DBR0),gr14
	setlo		%lo(__400_DBR0),gr14
	setlos.p	#__400_DBR1-__400_DBR0,gr11
	setlos		#__400_DBR2-__400_DBR0,gr12
	setlos.p	#__400_DBR3-__400_DBR0,gr13
	setlos		#32,gr5			; cacheline size
	setlos.p	#0,gr15			; amount to shift addr reg by
	setlos		#0x00ff,gr4
	movgs		gr4,cccr		; extant DARS/DAMK regs
	bralr

###############################################################################
#
# rearrange the bus controller registers
#
#	ENTRY:			EXIT:
# GR26	&__head_reference	[saved]
# GR30	LED address		revised LED address
#
###############################################################################
	.globl		__head_fr451_set_busctl
__head_fr451_set_busctl:
	sethi.p		%hi(__400_LGCR),gr4
	setlo		%lo(__400_LGCR),gr4
	sethi.p		%hi(__400_LSBR),gr10
	setlo		%lo(__400_LSBR),gr10
	sethi.p		%hi(__400_LCR),gr11
	setlo		%lo(__400_LCR),gr11

	# set the bus controller
	ldi		@(gr4,#0),gr5
	ori		gr5,#0xff,gr5		; make sure all chip-selects are enabled
	sti		gr5,@(gr4,#0)

	sethi.p		%hi(__region_CS1),gr4
	setlo		%lo(__region_CS1),gr4
	sethi.p		%hi(__region_CS1_M),gr5
	setlo		%lo(__region_CS1_M),gr5
	sethi.p		%hi(__region_CS1_C),gr6
	setlo		%lo(__region_CS1_C),gr6
	sti		gr4,@(gr10,#1*0x08)
	sti		gr5,@(gr10,#1*0x08+0x100)
	sti		gr6,@(gr11,#1*0x08)
	sethi.p		%hi(__region_CS2),gr4
	setlo		%lo(__region_CS2),gr4
	sethi.p		%hi(__region_CS2_M),gr5
	setlo		%lo(__region_CS2_M),gr5
	sethi.p		%hi(__region_CS2_C),gr6
	setlo		%lo(__region_CS2_C),gr6
	sti		gr4,@(gr10,#2*0x08)
	sti		gr5,@(gr10,#2*0x08+0x100)
	sti		gr6,@(gr11,#2*0x08)
	sethi.p		%hi(__region_CS3),gr4
	setlo		%lo(__region_CS3),gr4
	sethi.p		%hi(__region_CS3_M),gr5
	setlo		%lo(__region_CS3_M),gr5
	sethi.p		%hi(__region_CS3_C),gr6
	setlo		%lo(__region_CS3_C),gr6
	sti		gr4,@(gr10,#3*0x08)
	sti		gr5,@(gr10,#3*0x08+0x100)
	sti		gr6,@(gr11,#3*0x08)
	sethi.p		%hi(__region_CS4),gr4
	setlo		%lo(__region_CS4),gr4
	sethi.p		%hi(__region_CS4_M),gr5
	setlo		%lo(__region_CS4_M),gr5
	sethi.p		%hi(__region_CS4_C),gr6
	setlo		%lo(__region_CS4_C),gr6
	sti		gr4,@(gr10,#4*0x08)
	sti		gr5,@(gr10,#4*0x08+0x100)
	sti		gr6,@(gr11,#4*0x08)
	sethi.p		%hi(__region_CS5),gr4
	setlo		%lo(__region_CS5),gr4
	sethi.p		%hi(__region_CS5_M),gr5
	setlo		%lo(__region_CS5_M),gr5
	sethi.p		%hi(__region_CS5_C),gr6
	setlo		%lo(__region_CS5_C),gr6
	sti		gr4,@(gr10,#5*0x08)
	sti		gr5,@(gr10,#5*0x08+0x100)
	sti		gr6,@(gr11,#5*0x08)
	sethi.p		%hi(__region_CS6),gr4
	setlo		%lo(__region_CS6),gr4
	sethi.p		%hi(__region_CS6_M),gr5
	setlo		%lo(__region_CS6_M),gr5
	sethi.p		%hi(__region_CS6_C),gr6
	setlo		%lo(__region_CS6_C),gr6
	sti		gr4,@(gr10,#6*0x08)
	sti		gr5,@(gr10,#6*0x08+0x100)
	sti		gr6,@(gr11,#6*0x08)
	sethi.p		%hi(__region_CS7),gr4
	setlo		%lo(__region_CS7),gr4
	sethi.p		%hi(__region_CS7_M),gr5
	setlo		%lo(__region_CS7_M),gr5
	sethi.p		%hi(__region_CS7_C),gr6
	setlo		%lo(__region_CS7_C),gr6
	sti		gr4,@(gr10,#7*0x08)
	sti		gr5,@(gr10,#7*0x08+0x100)
	sti		gr6,@(gr11,#7*0x08)
	membar
	bar

	# adjust LED bank address
#ifdef CONFIG_MB93091_VDK
	sethi.p		%hi(__region_CS2 + 0x01200004),gr30
	setlo		%lo(__region_CS2 + 0x01200004),gr30
#endif
	bralr

###############################################################################
#
# determine the total SDRAM size
#
#	ENTRY:			EXIT:
# GR25	-			SDRAM size
# GR26	&__head_reference	[saved]
# GR30	LED address		[saved]
#
###############################################################################
	.globl		__head_fr451_survey_sdram
__head_fr451_survey_sdram:
	sethi.p		%hi(__400_DAM0),gr11
	setlo		%lo(__400_DAM0),gr11
	sethi.p		%hi(__400_DBR0),gr12
	setlo		%lo(__400_DBR0),gr12

	sethi.p		%hi(0xfe000000),gr17		; unused SDRAM DBR value
	setlo		%lo(0xfe000000),gr17
	setlos		#0,gr25

	ldi		@(gr12,#0x00),gr4		; DAR0
	subcc		gr4,gr17,gr0,icc0
	beq		icc0,#0,__head_no_DCS0
	ldi		@(gr11,#0x00),gr6		; DAM0: bits 31:20 match addr 31:20
	add		gr25,gr6,gr25
	addi		gr25,#1,gr25
__head_no_DCS0:

	ldi		@(gr12,#0x08),gr4		; DAR1
	subcc		gr4,gr17,gr0,icc0
	beq		icc0,#0,__head_no_DCS1
	ldi		@(gr11,#0x08),gr6		; DAM1: bits 31:20 match addr 31:20
	add		gr25,gr6,gr25
	addi		gr25,#1,gr25
__head_no_DCS1:

	ldi		@(gr12,#0x10),gr4		; DAR2
	subcc		gr4,gr17,gr0,icc0
	beq		icc0,#0,__head_no_DCS2
	ldi		@(gr11,#0x10),gr6		; DAM2: bits 31:20 match addr 31:20
	add		gr25,gr6,gr25
	addi		gr25,#1,gr25
__head_no_DCS2:

	ldi		@(gr12,#0x18),gr4		; DAR3
	subcc		gr4,gr17,gr0,icc0
	beq		icc0,#0,__head_no_DCS3
	ldi		@(gr11,#0x18),gr6		; DAM3: bits 31:20 match addr 31:20
	add		gr25,gr6,gr25
	addi		gr25,#1,gr25
__head_no_DCS3:
	bralr

###############################################################################
#
# set the protection map with the I/DAMPR registers
#
#	ENTRY:			EXIT:
# GR25	SDRAM size		[saved]
# GR26	&__head_reference	[saved]
# GR30	LED address		[saved]
#
#
# Using this map:
#	REGISTERS	ADDRESS RANGE		VIEW
#	===============	======================	===============================
#	IAMPR0/DAMPR0	0xC0000000-0xCFFFFFFF	Cached kernel RAM Window
#	DAMPR11		0xE0000000-0xFFFFFFFF	Uncached I/O
#
###############################################################################
	.globl		__head_fr451_set_protection
__head_fr451_set_protection:
	movsg		lr,gr27

	# set the I/O region protection registers for FR451 in MMU mode
#define PGPROT_IO	xAMPRx_L|xAMPRx_M|xAMPRx_S_KERNEL|xAMPRx_C|xAMPRx_V

	sethi.p		%hi(__region_IO),gr5
	setlo		%lo(__region_IO),gr5
	setlos		#PGPROT_IO|xAMPRx_SS_512Mb,gr4
	or		gr4,gr5,gr4
	movgs		gr5,damlr11			; General I/O tile
	movgs		gr4,dampr11

	# need to open a window onto at least part of the RAM for the kernel's use
	sethi.p		%hi(__sdram_base),gr8
	setlo		%lo(__sdram_base),gr8		; physical address
	sethi.p		%hi(__page_offset),gr9
	setlo		%lo(__page_offset),gr9		; virtual address

	setlos		#xAMPRx_L|xAMPRx_M|xAMPRx_SS_256Mb|xAMPRx_S_KERNEL|xAMPRx_V,gr11
	or		gr8,gr11,gr8

	movgs		gr9,iamlr0			; mapped from real address 0
	movgs		gr8,iampr0			; cached kernel memory at 0xC0000000
	movgs		gr9,damlr0
	movgs		gr8,dampr0

	# set a temporary mapping for the kernel running at address 0 until we've turned on the MMU
	sethi.p		%hi(__sdram_base),gr9
	setlo		%lo(__sdram_base),gr9		; virtual address

	and.p		gr4,gr11,gr4
	and		gr5,gr11,gr5
	or.p		gr4,gr11,gr4
	or		gr5,gr11,gr5

	movgs		gr9,iamlr1			; mapped from real address 0
	movgs		gr8,iampr1			; cached kernel memory at 0x00000000
	movgs		gr9,damlr1
	movgs		gr8,dampr1

	# we use DAMR2-10 for kmap_atomic(), cache flush and TLB management
	# since the DAMLR regs are not going to change, we can set them now
	# also set up IAMLR2 to the same as DAMLR5
	sethi.p		%hi(KMAP_ATOMIC_PRIMARY_FRAME),gr4
	setlo		%lo(KMAP_ATOMIC_PRIMARY_FRAME),gr4
	sethi.p		%hi(PAGE_SIZE),gr5
	setlo		%lo(PAGE_SIZE),gr5

	movgs		gr4,damlr2
	movgs		gr4,iamlr2
	add		gr4,gr5,gr4
	movgs		gr4,damlr3
	add		gr4,gr5,gr4
	movgs		gr4,damlr4
	add		gr4,gr5,gr4
	movgs		gr4,damlr5
	add		gr4,gr5,gr4
	movgs		gr4,damlr6
	add		gr4,gr5,gr4
	movgs		gr4,damlr7
	add		gr4,gr5,gr4
	movgs		gr4,damlr8
	add		gr4,gr5,gr4
	movgs		gr4,damlr9
	add		gr4,gr5,gr4
	movgs		gr4,damlr10

	movgs		gr0,dampr2
	movgs		gr0,dampr4
	movgs		gr0,dampr5
	movgs		gr0,dampr6
	movgs		gr0,dampr7
	movgs		gr0,dampr8
	movgs		gr0,dampr9
	movgs		gr0,dampr10

	movgs		gr0,iamlr3
	movgs		gr0,iamlr4
	movgs		gr0,iamlr5
	movgs		gr0,iamlr6
	movgs		gr0,iamlr7

	movgs		gr0,iampr2
	movgs		gr0,iampr3
	movgs		gr0,iampr4
	movgs		gr0,iampr5
	movgs		gr0,iampr6
	movgs		gr0,iampr7

	# start in TLB context 0 with the swapper's page tables
	movgs		gr0,cxnr

	sethi.p		%hi(swapper_pg_dir),gr4
	setlo		%lo(swapper_pg_dir),gr4
	sethi.p		%hi(__page_offset),gr5
	setlo		%lo(__page_offset),gr5
	sub		gr4,gr5,gr4
	movgs		gr4,ttbr
	setlos		#xAMPRx_L|xAMPRx_M|xAMPRx_SS_16Kb|xAMPRx_S|xAMPRx_C|xAMPRx_V,gr5
	or		gr4,gr5,gr4
	movgs		gr4,dampr3

	# the FR451 also has an extra trap base register
	movsg		tbr,gr4
	movgs		gr4,btbr

	LEDS		0x3300
	jmpl		@(gr27,gr0)

###############################################################################
#
# finish setting up the protection registers
#
###############################################################################
	.globl		__head_fr451_finalise_protection
__head_fr451_finalise_protection:
	# turn on the timers as appropriate
	movgs		gr0,timerh
	movgs		gr0,timerl
	movgs		gr0,timerd
	movsg		hsr0,gr4
	sethi.p		%hi(HSR0_ETMI),gr5
	setlo		%lo(HSR0_ETMI),gr5
	or		gr4,gr5,gr4
	movgs		gr4,hsr0

	# clear the TLB entry cache
	movgs		gr0,iamlr1
	movgs		gr0,iampr1
	movgs		gr0,damlr1
	movgs		gr0,dampr1

	# clear the PGE cache
	sethi.p		%hi(__flush_tlb_all),gr4
	setlo		%lo(__flush_tlb_all),gr4
	jmpl		@(gr4,gr0)