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[mirror_ubuntu-bionic-kernel.git] / arch / frv / kernel / head-mmu-fr451.S
1 /* head-mmu-fr451.S: FR451 mmu-linux specific bits of initialisation
2 *
3 * Copyright (C) 2004 Red Hat, Inc. All Rights Reserved.
4 * Written by David Howells (dhowells@redhat.com)
5 *
6 * This program is free software; you can redistribute it and/or
7 * modify it under the terms of the GNU General Public License
8 * as published by the Free Software Foundation; either version
9 * 2 of the License, or (at your option) any later version.
10 */
11
12 #include <linux/config.h>
13 #include <linux/threads.h>
14 #include <linux/linkage.h>
15 #include <asm/ptrace.h>
16 #include <asm/page.h>
17 #include <asm/mem-layout.h>
18 #include <asm/spr-regs.h>
19 #include <asm/mb86943a.h>
20 #include "head.inc"
21
22
23 #define __400_DBR0 0xfe000e00
24 #define __400_DBR1 0xfe000e08
25 #define __400_DBR2 0xfe000e10
26 #define __400_DBR3 0xfe000e18
27 #define __400_DAM0 0xfe000f00
28 #define __400_DAM1 0xfe000f08
29 #define __400_DAM2 0xfe000f10
30 #define __400_DAM3 0xfe000f18
31 #define __400_LGCR 0xfe000010
32 #define __400_LCR 0xfe000100
33 #define __400_LSBR 0xfe000c00
34
35 .section .text.init,"ax"
36 .balign 4
37
38 ###############################################################################
39 #
40 # describe the position and layout of the SDRAM controller registers
41 #
42 # ENTRY: EXIT:
43 # GR5 - cacheline size
44 # GR11 - displacement of 2nd SDRAM addr reg from GR14
45 # GR12 - displacement of 3rd SDRAM addr reg from GR14
46 # GR13 - displacement of 4th SDRAM addr reg from GR14
47 # GR14 - address of 1st SDRAM addr reg
48 # GR15 - amount to shift address by to match SDRAM addr reg
49 # GR26 &__head_reference [saved]
50 # GR30 LED address [saved]
51 # CC0 - T if DBR0 is present
52 # CC1 - T if DBR1 is present
53 # CC2 - T if DBR2 is present
54 # CC3 - T if DBR3 is present
55 #
56 ###############################################################################
57 .globl __head_fr451_describe_sdram
58 __head_fr451_describe_sdram:
59 sethi.p %hi(__400_DBR0),gr14
60 setlo %lo(__400_DBR0),gr14
61 setlos.p #__400_DBR1-__400_DBR0,gr11
62 setlos #__400_DBR2-__400_DBR0,gr12
63 setlos.p #__400_DBR3-__400_DBR0,gr13
64 setlos #32,gr5 ; cacheline size
65 setlos.p #0,gr15 ; amount to shift addr reg by
66 setlos #0x00ff,gr4
67 movgs gr4,cccr ; extant DARS/DAMK regs
68 bralr
69
70 ###############################################################################
71 #
72 # rearrange the bus controller registers
73 #
74 # ENTRY: EXIT:
75 # GR26 &__head_reference [saved]
76 # GR30 LED address revised LED address
77 #
78 ###############################################################################
79 .globl __head_fr451_set_busctl
80 __head_fr451_set_busctl:
81 sethi.p %hi(__400_LGCR),gr4
82 setlo %lo(__400_LGCR),gr4
83 sethi.p %hi(__400_LSBR),gr10
84 setlo %lo(__400_LSBR),gr10
85 sethi.p %hi(__400_LCR),gr11
86 setlo %lo(__400_LCR),gr11
87
88 # set the bus controller
89 ldi @(gr4,#0),gr5
90 ori gr5,#0xff,gr5 ; make sure all chip-selects are enabled
91 sti gr5,@(gr4,#0)
92
93 sethi.p %hi(__region_CS1),gr4
94 setlo %lo(__region_CS1),gr4
95 sethi.p %hi(__region_CS1_M),gr5
96 setlo %lo(__region_CS1_M),gr5
97 sethi.p %hi(__region_CS1_C),gr6
98 setlo %lo(__region_CS1_C),gr6
99 sti gr4,@(gr10,#1*0x08)
100 sti gr5,@(gr10,#1*0x08+0x100)
101 sti gr6,@(gr11,#1*0x08)
102 sethi.p %hi(__region_CS2),gr4
103 setlo %lo(__region_CS2),gr4
104 sethi.p %hi(__region_CS2_M),gr5
105 setlo %lo(__region_CS2_M),gr5
106 sethi.p %hi(__region_CS2_C),gr6
107 setlo %lo(__region_CS2_C),gr6
108 sti gr4,@(gr10,#2*0x08)
109 sti gr5,@(gr10,#2*0x08+0x100)
110 sti gr6,@(gr11,#2*0x08)
111 sethi.p %hi(__region_CS3),gr4
112 setlo %lo(__region_CS3),gr4
113 sethi.p %hi(__region_CS3_M),gr5
114 setlo %lo(__region_CS3_M),gr5
115 sethi.p %hi(__region_CS3_C),gr6
116 setlo %lo(__region_CS3_C),gr6
117 sti gr4,@(gr10,#3*0x08)
118 sti gr5,@(gr10,#3*0x08+0x100)
119 sti gr6,@(gr11,#3*0x08)
120 sethi.p %hi(__region_CS4),gr4
121 setlo %lo(__region_CS4),gr4
122 sethi.p %hi(__region_CS4_M),gr5
123 setlo %lo(__region_CS4_M),gr5
124 sethi.p %hi(__region_CS4_C),gr6
125 setlo %lo(__region_CS4_C),gr6
126 sti gr4,@(gr10,#4*0x08)
127 sti gr5,@(gr10,#4*0x08+0x100)
128 sti gr6,@(gr11,#4*0x08)
129 sethi.p %hi(__region_CS5),gr4
130 setlo %lo(__region_CS5),gr4
131 sethi.p %hi(__region_CS5_M),gr5
132 setlo %lo(__region_CS5_M),gr5
133 sethi.p %hi(__region_CS5_C),gr6
134 setlo %lo(__region_CS5_C),gr6
135 sti gr4,@(gr10,#5*0x08)
136 sti gr5,@(gr10,#5*0x08+0x100)
137 sti gr6,@(gr11,#5*0x08)
138 sethi.p %hi(__region_CS6),gr4
139 setlo %lo(__region_CS6),gr4
140 sethi.p %hi(__region_CS6_M),gr5
141 setlo %lo(__region_CS6_M),gr5
142 sethi.p %hi(__region_CS6_C),gr6
143 setlo %lo(__region_CS6_C),gr6
144 sti gr4,@(gr10,#6*0x08)
145 sti gr5,@(gr10,#6*0x08+0x100)
146 sti gr6,@(gr11,#6*0x08)
147 sethi.p %hi(__region_CS7),gr4
148 setlo %lo(__region_CS7),gr4
149 sethi.p %hi(__region_CS7_M),gr5
150 setlo %lo(__region_CS7_M),gr5
151 sethi.p %hi(__region_CS7_C),gr6
152 setlo %lo(__region_CS7_C),gr6
153 sti gr4,@(gr10,#7*0x08)
154 sti gr5,@(gr10,#7*0x08+0x100)
155 sti gr6,@(gr11,#7*0x08)
156 membar
157 bar
158
159 # adjust LED bank address
160 #ifdef CONFIG_MB93091_VDK
161 sethi.p %hi(__region_CS2 + 0x01200004),gr30
162 setlo %lo(__region_CS2 + 0x01200004),gr30
163 #endif
164 bralr
165
166 ###############################################################################
167 #
168 # determine the total SDRAM size
169 #
170 # ENTRY: EXIT:
171 # GR25 - SDRAM size
172 # GR26 &__head_reference [saved]
173 # GR30 LED address [saved]
174 #
175 ###############################################################################
176 .globl __head_fr451_survey_sdram
177 __head_fr451_survey_sdram:
178 sethi.p %hi(__400_DAM0),gr11
179 setlo %lo(__400_DAM0),gr11
180 sethi.p %hi(__400_DBR0),gr12
181 setlo %lo(__400_DBR0),gr12
182
183 sethi.p %hi(0xfe000000),gr17 ; unused SDRAM DBR value
184 setlo %lo(0xfe000000),gr17
185 setlos #0,gr25
186
187 ldi @(gr12,#0x00),gr4 ; DAR0
188 subcc gr4,gr17,gr0,icc0
189 beq icc0,#0,__head_no_DCS0
190 ldi @(gr11,#0x00),gr6 ; DAM0: bits 31:20 match addr 31:20
191 add gr25,gr6,gr25
192 addi gr25,#1,gr25
193 __head_no_DCS0:
194
195 ldi @(gr12,#0x08),gr4 ; DAR1
196 subcc gr4,gr17,gr0,icc0
197 beq icc0,#0,__head_no_DCS1
198 ldi @(gr11,#0x08),gr6 ; DAM1: bits 31:20 match addr 31:20
199 add gr25,gr6,gr25
200 addi gr25,#1,gr25
201 __head_no_DCS1:
202
203 ldi @(gr12,#0x10),gr4 ; DAR2
204 subcc gr4,gr17,gr0,icc0
205 beq icc0,#0,__head_no_DCS2
206 ldi @(gr11,#0x10),gr6 ; DAM2: bits 31:20 match addr 31:20
207 add gr25,gr6,gr25
208 addi gr25,#1,gr25
209 __head_no_DCS2:
210
211 ldi @(gr12,#0x18),gr4 ; DAR3
212 subcc gr4,gr17,gr0,icc0
213 beq icc0,#0,__head_no_DCS3
214 ldi @(gr11,#0x18),gr6 ; DAM3: bits 31:20 match addr 31:20
215 add gr25,gr6,gr25
216 addi gr25,#1,gr25
217 __head_no_DCS3:
218 bralr
219
220 ###############################################################################
221 #
222 # set the protection map with the I/DAMPR registers
223 #
224 # ENTRY: EXIT:
225 # GR25 SDRAM size [saved]
226 # GR26 &__head_reference [saved]
227 # GR30 LED address [saved]
228 #
229 #
230 # Using this map:
231 # REGISTERS ADDRESS RANGE VIEW
232 # =============== ====================== ===============================
233 # IAMPR0/DAMPR0 0xC0000000-0xCFFFFFFF Cached kernel RAM Window
234 # DAMPR11 0xE0000000-0xFFFFFFFF Uncached I/O
235 #
236 ###############################################################################
237 .globl __head_fr451_set_protection
238 __head_fr451_set_protection:
239 movsg lr,gr27
240
241 # set the I/O region protection registers for FR451 in MMU mode
242 #define PGPROT_IO xAMPRx_L|xAMPRx_M|xAMPRx_S_KERNEL|xAMPRx_C|xAMPRx_V
243
244 sethi.p %hi(__region_IO),gr5
245 setlo %lo(__region_IO),gr5
246 setlos #PGPROT_IO|xAMPRx_SS_512Mb,gr4
247 or gr4,gr5,gr4
248 movgs gr5,damlr11 ; General I/O tile
249 movgs gr4,dampr11
250
251 # need to open a window onto at least part of the RAM for the kernel's use
252 sethi.p %hi(__sdram_base),gr8
253 setlo %lo(__sdram_base),gr8 ; physical address
254 sethi.p %hi(__page_offset),gr9
255 setlo %lo(__page_offset),gr9 ; virtual address
256
257 setlos #xAMPRx_L|xAMPRx_M|xAMPRx_SS_256Mb|xAMPRx_S_KERNEL|xAMPRx_V,gr11
258 or gr8,gr11,gr8
259
260 movgs gr9,iamlr0 ; mapped from real address 0
261 movgs gr8,iampr0 ; cached kernel memory at 0xC0000000
262 movgs gr9,damlr0
263 movgs gr8,dampr0
264
265 # set a temporary mapping for the kernel running at address 0 until we've turned on the MMU
266 sethi.p %hi(__sdram_base),gr9
267 setlo %lo(__sdram_base),gr9 ; virtual address
268
269 and.p gr4,gr11,gr4
270 and gr5,gr11,gr5
271 or.p gr4,gr11,gr4
272 or gr5,gr11,gr5
273
274 movgs gr9,iamlr1 ; mapped from real address 0
275 movgs gr8,iampr1 ; cached kernel memory at 0x00000000
276 movgs gr9,damlr1
277 movgs gr8,dampr1
278
279 # we use DAMR2-10 for kmap_atomic(), cache flush and TLB management
280 # since the DAMLR regs are not going to change, we can set them now
281 # also set up IAMLR2 to the same as DAMLR5
282 sethi.p %hi(KMAP_ATOMIC_PRIMARY_FRAME),gr4
283 setlo %lo(KMAP_ATOMIC_PRIMARY_FRAME),gr4
284 sethi.p %hi(PAGE_SIZE),gr5
285 setlo %lo(PAGE_SIZE),gr5
286
287 movgs gr4,damlr2
288 movgs gr4,iamlr2
289 add gr4,gr5,gr4
290 movgs gr4,damlr3
291 add gr4,gr5,gr4
292 movgs gr4,damlr4
293 add gr4,gr5,gr4
294 movgs gr4,damlr5
295 add gr4,gr5,gr4
296 movgs gr4,damlr6
297 add gr4,gr5,gr4
298 movgs gr4,damlr7
299 add gr4,gr5,gr4
300 movgs gr4,damlr8
301 add gr4,gr5,gr4
302 movgs gr4,damlr9
303 add gr4,gr5,gr4
304 movgs gr4,damlr10
305
306 movgs gr0,dampr2
307 movgs gr0,dampr4
308 movgs gr0,dampr5
309 movgs gr0,dampr6
310 movgs gr0,dampr7
311 movgs gr0,dampr8
312 movgs gr0,dampr9
313 movgs gr0,dampr10
314
315 movgs gr0,iamlr3
316 movgs gr0,iamlr4
317 movgs gr0,iamlr5
318 movgs gr0,iamlr6
319 movgs gr0,iamlr7
320
321 movgs gr0,iampr2
322 movgs gr0,iampr3
323 movgs gr0,iampr4
324 movgs gr0,iampr5
325 movgs gr0,iampr6
326 movgs gr0,iampr7
327
328 # start in TLB context 0 with the swapper's page tables
329 movgs gr0,cxnr
330
331 sethi.p %hi(swapper_pg_dir),gr4
332 setlo %lo(swapper_pg_dir),gr4
333 sethi.p %hi(__page_offset),gr5
334 setlo %lo(__page_offset),gr5
335 sub gr4,gr5,gr4
336 movgs gr4,ttbr
337 setlos #xAMPRx_L|xAMPRx_M|xAMPRx_SS_16Kb|xAMPRx_S|xAMPRx_C|xAMPRx_V,gr5
338 or gr4,gr5,gr4
339 movgs gr4,dampr3
340
341 # the FR451 also has an extra trap base register
342 movsg tbr,gr4
343 movgs gr4,btbr
344
345 LEDS 0x3300
346 jmpl @(gr27,gr0)
347
348 ###############################################################################
349 #
350 # finish setting up the protection registers
351 #
352 ###############################################################################
353 .globl __head_fr451_finalise_protection
354 __head_fr451_finalise_protection:
355 # turn on the timers as appropriate
356 movgs gr0,timerh
357 movgs gr0,timerl
358 movgs gr0,timerd
359 movsg hsr0,gr4
360 sethi.p %hi(HSR0_ETMI),gr5
361 setlo %lo(HSR0_ETMI),gr5
362 or gr4,gr5,gr4
363 movgs gr4,hsr0
364
365 # clear the TLB entry cache
366 movgs gr0,iamlr1
367 movgs gr0,iampr1
368 movgs gr0,damlr1
369 movgs gr0,dampr1
370
371 # clear the PGE cache
372 sethi.p %hi(__flush_tlb_all),gr4
373 setlo %lo(__flush_tlb_all),gr4
374 jmpl @(gr4,gr0)
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