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wdenk80885a92004-02-26 23:46:20 +00001/*
2 * Board specific setup info
3 *
4 * (C) Copyright 2003
5 * Texas Instruments, <www.ti.com>
6 * Kshitij Gupta <Kshitij@ti.com>
7 *
8 * Modified for the NS9750 DevBoard by
9 * (C) Copyright 2004 by FS Forth-Systeme GmbH.
10 * Markus Pietrek <mpietrek@fsforth.de>
11 * @References: [1] NS9750 Hardware Reference/December 2003
12 * [2] ns9750_a.cmd from MAJIC configuration
13 *
14 * See file CREDITS for list of people who contributed to this
15 * project.
16 *
17 * This program is free software; you can redistribute it and/or
18 * modify it under the terms of the GNU General Public License as
19 * published by the Free Software Foundation; either version 2 of
20 * the License, or (at your option) any later version.
21 *
22 * This program is distributed in the hope that it will be useful,
23 * but WITHOUT ANY WARRANTY; without even the implied warranty of
24 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
25 * GNU General Public License for more details.
26 *
27 * You should have received a copy of the GNU General Public License
28 * along with this program; if not, write to the Free Software
29 * Foundation, Inc., 59 Temple Place, Suite 330, Boston,
30 * MA 02111-1307 USA
31 */
32
33#include <config.h>
34#include <version.h>
35
36#if defined(CONFIG_NS9750DEV)
wdenk8aa1a2d2005-04-04 12:44:11 +000037# ifndef CONFIG_SKIP_LOWLEVEL_INIT
wdenk80885a92004-02-26 23:46:20 +000038# include <./ns9750_sys.h>
39# include <./ns9750_mem.h>
40# endif
41#endif
42
43/***********************************************************************
44 * @Function: write_register_block
45 * @Return: nothing
46 * @Descr: Copies the register block of register_offset:register value to
47 * the registers at base r0. The block is assumed to start in RAM at r1
48 * and end at r2. The linked RAM base address of U-Boot is assumed to be
49 * in r5 while the ROM base address we are running from is r6
50 * Uses r3 and r4 as tempory registers
51 ***********************************************************************/
52
53.macro write_register_block
54 @@ map the addresses to high memory
55 sub r1, r1, r5
56 add r1, r1, r6
57 sub r2, r2, r5
58 add r2, r2, r6
59
60 @@ copy all
611:
62 @@ Write register/value pair starting at [r1] to register base r0
63 ldr r3, [r1], #4
64 ldr r4, [r1], #4
65 str r4, [r0,r3]
66 cmp r1, r2
67 blt 1b
68.endm
69
70_TEXT_BASE:
71 .word TEXT_BASE @ sdram load addr from config.mk
72_PHYS_FLASH:
73 .word PHYS_FLASH_1 @ real flash address (without mirroring)
74_CAS_LATENCY:
75 .word 0x00022000 @ for CAS2 latency
76
wdenk8aa1a2d2005-04-04 12:44:11 +000077#ifndef CONFIG_SKIP_LOWLEVEL_INIT
Wolfgang Denk87cb6862005-10-06 17:08:18 +020078.globl lowlevel_init
79lowlevel_init:
wdenk80885a92004-02-26 23:46:20 +000080
81 /* U-Boot may be linked to RAM at 0x780000. But this code will run in
82 flash from 0x0. But in order to enable RAM we have to disable the
83 mirror bit, therefore we have to jump to our real flash address
84 beginning at PHYS_FLASH_1 (CS4 Base). Therefore,
85 _run_at_real_flash_address may be 0x500003b0 while be linked to
86 0x7803b0. So we must modify our linked addresses */
87
88 @@ branch to high memory address, away from 0x0
89 ldr r5, _TEXT_BASE
90 ldr r6, _PHYS_FLASH
91 ldr r0, =_run_at_real_flash_address
92 sub r0, r0, r5
93 add r0, r0, r6
94 mov pc, r0
95 nop @ for pipelining
96
97_run_at_real_flash_address:
98 @@ now we are running > PHYS_FLASH_1, safe to enable memory controller
99
100 @@ Write Memory Configuration Registers
101
102 ldr r0, _NS9750_MEM_MODULE_BASE
103 ldr r1, =_MEM_CONFIG_START
104 ldr r2, =_MEM_CONFIG_END
105
106 write_register_block
107
108 @@ Give SDRAM some time to settle
109 @@ @TODO. According to [2] it should be 2 AHB cycles. Check
110
111 ldr r1, =0x50
112_sdram_settle:
113 subs r1, r1, #1
114 bne _sdram_settle
115
116_enable_mappings:
117 @@ Enable SDRAM Mode
118
119 ldr r1, =_MEM_MODE_START
120 ldr r2, =_MEM_MODE_END
121
122 write_register_block
123
124 ldr r3, _CAS_LATENCY @ perform one read from SDRAM
125 ldr r3, [r3]
126
127 @@ Enable SDRAM and memory mappings
128
129 ldr r1, =_MEM_ENABLE_START
130 ldr r2, =_MEM_ENABLE_END
131
132 write_register_block
133
134 @@ Activate AHB monitor
135
136 ldr r0, =NS9750_SYS_MODULE_BASE
137 ldr r1, =_AHB_MONITOR_START
138 ldr r2, =_AHB_MONITOR_END
139
140 write_register_block
141_relocate_lr:
142 /* lr and ip (from cpu_init_crit) are still based on 0x0, relocate it to
143 PHYS_FLASH. */
144 mov r1, ip
145 add r1, r1, r6
146 mov ip, r1
147
148 mov r1, lr
149 add r1, r1, r6
150 mov lr, r1
151
152 @@ back to arch calling code
153 mov pc, lr
154
155 .ltorg
156
157_NS9750_MEM_MODULE_BASE:
158 .word NS9750_MEM_MODULE_BASE
159
160_MEM_CONFIG_START:
161 /* Table of 2 32bit entries. First word is register address offset
162 relative to NS9750_MEM_MODULE_BASE, second one is value. They are
163 written in order of appearance */
164
165 @@ Register values taken from [2]
166 .word NS9750_MEM_CTRL
167 .word NS9750_MEM_CTRL_E
168
169 .word NS9750_MEM_DYN_REFRESH
170 .word (0x6 & NS9750_MEM_DYN_REFRESH_MA)
171
172 .word NS9750_MEM_DYN_READ_CFG
173 .word (0x1 & NS9750_MEM_DYN_READ_CFG_MA)
174
175 .word NS9750_MEM_DYN_TRP
176 .word (0x1 & NS9750_MEM_DYN_TRP_MA)
177
178 .word NS9750_MEM_DYN_TRAS
179 .word (0x4 & NS9750_MEM_DYN_TRAS_MA)
180
181 .word NS9750_MEM_DYN_TAPR
182 .word (0x1 & NS9750_MEM_DYN_TRAS_MA)
183
184 .word NS9750_MEM_DYN_TDAL
185 .word (0x5 & NS9750_MEM_DYN_TDAL_MA)
186
187 .word NS9750_MEM_DYN_TWR
188 .word (0x1 & NS9750_MEM_DYN_TWR_MA)
189
190 .word NS9750_MEM_DYN_TRC
191 .word (0x6 & NS9750_MEM_DYN_TRC_MA)
192
193 .word NS9750_MEM_DYN_TRFC
194 .word (0x6 & NS9750_MEM_DYN_TRFC_MA)
195
196 .word NS9750_MEM_DYN_TRRD
197 .word (0x1 & NS9750_MEM_DYN_TRRD_MA)
198
199 .word NS9750_MEM_DYN_TMRD
200 .word (0x1 & NS9750_MEM_DYN_TMRD_MA)
201
202 @@ CS 4
203 .word NS9750_MEM_DYN_CFG(0)
204 .word (NS9750_MEM_DYN_CFG_AM | \
205 (0x280 & NS9750_MEM_DYN_CFG_AM_MA))
206
207 .word NS9750_MEM_DYN_RAS_CAS(0)
208 .word ((0x200 & NS9750_MEM_DYN_RAS_CAS_CAS_MA) | \
209 (0x03 & NS9750_MEM_DYN_RAS_CAS_RAS_MA))
210
211 @@ CS 5
212 .word NS9750_MEM_DYN_CFG(1)
213 .word (NS9750_MEM_DYN_CFG_AM | \
214 (0x280 & NS9750_MEM_DYN_CFG_AM_MA))
215
216 .word NS9750_MEM_DYN_RAS_CAS(1)
217 .word ((0x200 & NS9750_MEM_DYN_RAS_CAS_CAS_MA) | \
218 (0x03 & NS9750_MEM_DYN_RAS_CAS_RAS_MA))
219
220 @@ CS 6
221 .word NS9750_MEM_DYN_CFG(2)
222 .word (NS9750_MEM_DYN_CFG_AM | \
223 (0x280 & NS9750_MEM_DYN_CFG_AM_MA))
224
225 .word NS9750_MEM_DYN_RAS_CAS(2)
226 .word ((0x200 & NS9750_MEM_DYN_RAS_CAS_CAS_MA) | \
227 (0x03 & NS9750_MEM_DYN_RAS_CAS_RAS_MA))
228
229 @@ CS 7
230 .word NS9750_MEM_DYN_CFG(3)
231 .word (NS9750_MEM_DYN_CFG_AM | \
232 (0x280 & NS9750_MEM_DYN_CFG_AM_MA))
233
234 .word NS9750_MEM_DYN_RAS_CAS(3)
235 .word ((0x200 & NS9750_MEM_DYN_RAS_CAS_CAS_MA) | \
236 (0x03 & NS9750_MEM_DYN_RAS_CAS_RAS_MA))
237
238 .word NS9750_MEM_DYN_CTRL
239 .word (NS9750_MEM_DYN_CTRL_I_PALL | \
240 NS9750_MEM_DYN_CTRL_SR | \
241 NS9750_MEM_DYN_CTRL_CE )
242
243 .word NS9750_MEM_DYN_REFRESH
244 .word (0x1 & NS9750_MEM_DYN_REFRESH_MA)
245 @@ No further register settings after refresh
246_MEM_CONFIG_END:
247
248_MEM_MODE_START:
249 .word NS9750_MEM_DYN_REFRESH
250 .word (0x30 & NS9750_MEM_DYN_REFRESH_MA)
251
252 .word NS9750_MEM_DYN_CTRL
253 .word (NS9750_MEM_DYN_CTRL_I_MODE | \
254 NS9750_MEM_DYN_CTRL_SR | \
255 NS9750_MEM_DYN_CTRL_CE )
256_MEM_MODE_END:
257
258_MEM_ENABLE_START:
259 .word NS9750_MEM_DYN_CTRL
260 .word (NS9750_MEM_DYN_CTRL_I_NORMAL | \
261 NS9750_MEM_DYN_CTRL_SR | \
262 NS9750_MEM_DYN_CTRL_CE )
263
264 @@ CS 4
265 .word NS9750_MEM_DYN_CFG(0)
266 .word (NS9750_MEM_DYN_CFG_BDMC | \
267 NS9750_MEM_DYN_CFG_AM | \
268 (0x280 & NS9750_MEM_DYN_CFG_AM_MA))
269
270 @@ CS 5
271 .word NS9750_MEM_DYN_CFG(1)
272 .word (NS9750_MEM_DYN_CFG_BDMC | \
273 NS9750_MEM_DYN_CFG_AM | \
274 (0x280 & NS9750_MEM_DYN_CFG_AM_MA))
275
276 @@ CS 6
277 .word NS9750_MEM_DYN_CFG(2)
278 .word (NS9750_MEM_DYN_CFG_BDMC | \
279 NS9750_MEM_DYN_CFG_AM | \
280 (0x280 & NS9750_MEM_DYN_CFG_AM_MA))
281
282 @@ CS 7
283 .word NS9750_MEM_DYN_CFG(3)
284 .word (NS9750_MEM_DYN_CFG_BDMC | \
285 NS9750_MEM_DYN_CFG_AM | \
286 (0x280 & NS9750_MEM_DYN_CFG_AM_MA))
287_MEM_ENABLE_END:
288
289_AHB_MONITOR_START:
290 .word NS9750_SYS_AHB_TIMEOUT
291 .word 0x01000100 @ @TODO not calculated yet
292
293 .word NS9750_SYS_AHB_MON
294 .word (NS9750_SYS_AHB_MON_BMTC_GEN_IRQ | \
295 NS9750_SYS_AHB_MON_BATC_GEN_IRQ)
296_AHB_MONITOR_END:
297
wdenk8aa1a2d2005-04-04 12:44:11 +0000298#endif /* CONFIG_SKIP_LOWLEVEL_INIT */