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1/* head-uc-fr401.S: FR401/3/5 uc-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/spr-regs.h>
18#include <asm/mb86943a.h>
19#include "head.inc"
20
21
22#define __400_DBR0 0xfe000e00
23#define __400_DBR1 0xfe000e08
24#define __400_DBR2 0xfe000e10 /* not on FR401 */
25#define __400_DBR3 0xfe000e18 /* not on FR401 */
26#define __400_DAM0 0xfe000f00
27#define __400_DAM1 0xfe000f08
28#define __400_DAM2 0xfe000f10 /* not on FR401 */
29#define __400_DAM3 0xfe000f18 /* not on FR401 */
30#define __400_LGCR 0xfe000010
31#define __400_LCR 0xfe000100
32#define __400_LSBR 0xfe000c00
33
34 .section .text.init,"ax"
35 .balign 4
36
37###############################################################################
38#
39# describe the position and layout of the SDRAM controller registers
40#
41# ENTRY: EXIT:
42# GR5 - cacheline size
43# GR11 - displacement of 2nd SDRAM addr reg from GR14
44# GR12 - displacement of 3rd SDRAM addr reg from GR14
45# GR13 - displacement of 4th SDRAM addr reg from GR14
46# GR14 - address of 1st SDRAM addr reg
47# GR15 - amount to shift address by to match SDRAM addr reg
48# GR26 &__head_reference [saved]
49# GR30 LED address [saved]
50# CC0 - T if DBR0 is present
51# CC1 - T if DBR1 is present
52# CC2 - T if DBR2 is present (not FR401/FR401A)
53# CC3 - T if DBR3 is present (not FR401/FR401A)
54#
55###############################################################################
56 .globl __head_fr401_describe_sdram
57__head_fr401_describe_sdram:
58 sethi.p %hi(__400_DBR0),gr14
59 setlo %lo(__400_DBR0),gr14
60 setlos.p #__400_DBR1-__400_DBR0,gr11
61 setlos #__400_DBR2-__400_DBR0,gr12
62 setlos.p #__400_DBR3-__400_DBR0,gr13
63 setlos #32,gr5 ; cacheline size
64 setlos.p #0,gr15 ; amount to shift addr reg by
65
66 # specify which DBR regs are present
67 setlos #0x00ff,gr4
68 movgs gr4,cccr
69 movsg psr,gr3 ; check for FR401/FR401A
70 srli gr3,#25,gr3
71 subicc gr3,#0x20>>1,gr0,icc0
72 bnelr icc0,#1
73 setlos #0x000f,gr4
74 movgs gr4,cccr
75 bralr
76
77###############################################################################
78#
79# rearrange the bus controller registers
80#
81# ENTRY: EXIT:
82# GR26 &__head_reference [saved]
83# GR30 LED address revised LED address
84#
85###############################################################################
86 .globl __head_fr401_set_busctl
87__head_fr401_set_busctl:
88 sethi.p %hi(__400_LGCR),gr4
89 setlo %lo(__400_LGCR),gr4
90 sethi.p %hi(__400_LSBR),gr10
91 setlo %lo(__400_LSBR),gr10
92 sethi.p %hi(__400_LCR),gr11
93 setlo %lo(__400_LCR),gr11
94
95 # set the bus controller
96 ldi @(gr4,#0),gr5
97 ori gr5,#0xff,gr5 ; make sure all chip-selects are enabled
98 sti gr5,@(gr4,#0)
99
100 sethi.p %hi(__region_CS1),gr4
101 setlo %lo(__region_CS1),gr4
102 sethi.p %hi(__region_CS1_M),gr5
103 setlo %lo(__region_CS1_M),gr5
104 sethi.p %hi(__region_CS1_C),gr6
105 setlo %lo(__region_CS1_C),gr6
106 sti gr4,@(gr10,#1*0x08)
107 sti gr5,@(gr10,#1*0x08+0x100)
108 sti gr6,@(gr11,#1*0x08)
109 sethi.p %hi(__region_CS2),gr4
110 setlo %lo(__region_CS2),gr4
111 sethi.p %hi(__region_CS2_M),gr5
112 setlo %lo(__region_CS2_M),gr5
113 sethi.p %hi(__region_CS2_C),gr6
114 setlo %lo(__region_CS2_C),gr6
115 sti gr4,@(gr10,#2*0x08)
116 sti gr5,@(gr10,#2*0x08+0x100)
117 sti gr6,@(gr11,#2*0x08)
118 sethi.p %hi(__region_CS3),gr4
119 setlo %lo(__region_CS3),gr4
120 sethi.p %hi(__region_CS3_M),gr5
121 setlo %lo(__region_CS3_M),gr5
122 sethi.p %hi(__region_CS3_C),gr6
123 setlo %lo(__region_CS3_C),gr6
124 sti gr4,@(gr10,#3*0x08)
125 sti gr5,@(gr10,#3*0x08+0x100)
126 sti gr6,@(gr11,#3*0x08)
127 sethi.p %hi(__region_CS4),gr4
128 setlo %lo(__region_CS4),gr4
129 sethi.p %hi(__region_CS4_M),gr5
130 setlo %lo(__region_CS4_M),gr5
131 sethi.p %hi(__region_CS4_C),gr6
132 setlo %lo(__region_CS4_C),gr6
133 sti gr4,@(gr10,#4*0x08)
134 sti gr5,@(gr10,#4*0x08+0x100)
135 sti gr6,@(gr11,#4*0x08)
136 sethi.p %hi(__region_CS5),gr4
137 setlo %lo(__region_CS5),gr4
138 sethi.p %hi(__region_CS5_M),gr5
139 setlo %lo(__region_CS5_M),gr5
140 sethi.p %hi(__region_CS5_C),gr6
141 setlo %lo(__region_CS5_C),gr6
142 sti gr4,@(gr10,#5*0x08)
143 sti gr5,@(gr10,#5*0x08+0x100)
144 sti gr6,@(gr11,#5*0x08)
145 sethi.p %hi(__region_CS6),gr4
146 setlo %lo(__region_CS6),gr4
147 sethi.p %hi(__region_CS6_M),gr5
148 setlo %lo(__region_CS6_M),gr5
149 sethi.p %hi(__region_CS6_C),gr6
150 setlo %lo(__region_CS6_C),gr6
151 sti gr4,@(gr10,#6*0x08)
152 sti gr5,@(gr10,#6*0x08+0x100)
153 sti gr6,@(gr11,#6*0x08)
154 sethi.p %hi(__region_CS7),gr4
155 setlo %lo(__region_CS7),gr4
156 sethi.p %hi(__region_CS7_M),gr5
157 setlo %lo(__region_CS7_M),gr5
158 sethi.p %hi(__region_CS7_C),gr6
159 setlo %lo(__region_CS7_C),gr6
160 sti gr4,@(gr10,#7*0x08)
161 sti gr5,@(gr10,#7*0x08+0x100)
162 sti gr6,@(gr11,#7*0x08)
163 membar
164 bar
165
166 # adjust LED bank address
167 sethi.p %hi(LED_ADDR - 0x20000000 +__region_CS2),gr30
168 setlo %lo(LED_ADDR - 0x20000000 +__region_CS2),gr30
169 bralr
170
171###############################################################################
172#
173# determine the total SDRAM size
174#
175# ENTRY: EXIT:
176# GR25 - SDRAM size
177# GR26 &__head_reference [saved]
178# GR30 LED address [saved]
179#
180###############################################################################
181 .globl __head_fr401_survey_sdram
182__head_fr401_survey_sdram:
183 sethi.p %hi(__400_DAM0),gr11
184 setlo %lo(__400_DAM0),gr11
185 sethi.p %hi(__400_DBR0),gr12
186 setlo %lo(__400_DBR0),gr12
187
188 sethi.p %hi(0xfe000000),gr17 ; unused SDRAM DBR value
189 setlo %lo(0xfe000000),gr17
190 setlos #0,gr25
191
192 ldi @(gr12,#0x00),gr4 ; DAR0
193 subcc gr4,gr17,gr0,icc0
194 beq icc0,#0,__head_no_DCS0
195 ldi @(gr11,#0x00),gr6 ; DAM0: bits 31:20 match addr 31:20
196 add gr25,gr6,gr25
197 addi gr25,#1,gr25
198__head_no_DCS0:
199
200 ldi @(gr12,#0x08),gr4 ; DAR1
201 subcc gr4,gr17,gr0,icc0
202 beq icc0,#0,__head_no_DCS1
203 ldi @(gr11,#0x08),gr6 ; DAM1: bits 31:20 match addr 31:20
204 add gr25,gr6,gr25
205 addi gr25,#1,gr25
206__head_no_DCS1:
207
208 # FR401/FR401A does not have DCS2/3
209 movsg psr,gr3
210 srli gr3,#25,gr3
211 subicc gr3,#0x20>>1,gr0,icc0
212 beq icc0,#0,__head_no_DCS3
213
214 ldi @(gr12,#0x10),gr4 ; DAR2
215 subcc gr4,gr17,gr0,icc0
216 beq icc0,#0,__head_no_DCS2
217 ldi @(gr11,#0x10),gr6 ; DAM2: bits 31:20 match addr 31:20
218 add gr25,gr6,gr25
219 addi gr25,#1,gr25
220__head_no_DCS2:
221
222 ldi @(gr12,#0x18),gr4 ; DAR3
223 subcc gr4,gr17,gr0,icc0
224 beq icc0,#0,__head_no_DCS3
225 ldi @(gr11,#0x18),gr6 ; DAM3: bits 31:20 match addr 31:20
226 add gr25,gr6,gr25
227 addi gr25,#1,gr25
228__head_no_DCS3:
229 bralr
230
231###############################################################################
232#
233# set the protection map with the I/DAMPR registers
234#
235# ENTRY: EXIT:
236# GR25 SDRAM size [saved]
237# GR26 &__head_reference [saved]
238# GR30 LED address [saved]
239#
240###############################################################################
241 .globl __head_fr401_set_protection
242__head_fr401_set_protection:
243 movsg lr,gr27
244
245 # set the I/O region protection registers for FR401/3/5
246 sethi.p %hi(__region_IO),gr5
247 setlo %lo(__region_IO),gr5
248 ori gr5,#xAMPRx_SS_512Mb|xAMPRx_S_KERNEL|xAMPRx_C|xAMPRx_V,gr5
249 movgs gr0,iampr7
250 movgs gr5,dampr7 ; General I/O tile
251
252 # need to tile the remaining IAMPR/DAMPR registers to cover as much of the RAM as possible
253 # - start with the highest numbered registers
254 sethi.p %hi(__kernel_image_end),gr8
255 setlo %lo(__kernel_image_end),gr8
256 sethi.p %hi(32768),gr4 ; allow for a maximal allocator bitmap
257 setlo %lo(32768),gr4
258 add gr8,gr4,gr8
259 sethi.p %hi(1024*2048-1),gr4 ; round up to nearest 2MiB
260 setlo %lo(1024*2048-1),gr4
261 add.p gr8,gr4,gr8
262 not gr4,gr4
263 and gr8,gr4,gr8
264
265 sethi.p %hi(__page_offset),gr9
266 setlo %lo(__page_offset),gr9
267 add gr9,gr25,gr9
268
269 # GR8 = base of uncovered RAM
270 # GR9 = top of uncovered RAM
271
272#ifdef CONFIG_MB93093_PDK
273 sethi.p %hi(__region_CS2),gr4
274 setlo %lo(__region_CS2),gr4
275 ori gr4,#xAMPRx_SS_1Mb|xAMPRx_S_KERNEL|xAMPRx_C|xAMPRx_V,gr4
276 movgs gr4,dampr6
277 movgs gr0,iampr6
278#else
279 call __head_split_region
280 movgs gr4,iampr6
281 movgs gr5,dampr6
282#endif
283 call __head_split_region
284 movgs gr4,iampr5
285 movgs gr5,dampr5
286 call __head_split_region
287 movgs gr4,iampr4
288 movgs gr5,dampr4
289 call __head_split_region
290 movgs gr4,iampr3
291 movgs gr5,dampr3
292 call __head_split_region
293 movgs gr4,iampr2
294 movgs gr5,dampr2
295 call __head_split_region
296 movgs gr4,iampr1
297 movgs gr5,dampr1
298
299 # cover kernel core image with kernel-only segment
300 sethi.p %hi(__page_offset),gr8
301 setlo %lo(__page_offset),gr8
302 call __head_split_region
303
304#ifdef CONFIG_PROTECT_KERNEL
305 ori.p gr4,#xAMPRx_S_KERNEL,gr4
306 ori gr5,#xAMPRx_S_KERNEL,gr5
307#endif
308
309 movgs gr4,iampr0
310 movgs gr5,dampr0
311 jmpl @(gr27,gr0)
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