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wdenkf39748a2004-06-09 13:37:52 +00001/*
2 * Memory Setup - initialize memory controller(s) for devices required
3 * to boot and relocate
4 *
5 * See file CREDITS for list of people who contributed to this
6 * project.
7 *
8 * This program is free software; you can redistribute it and/or
9 * modify it under the terms of the GNU General Public License as
10 * published by the Free Software Foundation; either version 2 of
11 * the License, or (at your option) any later version.
12 *
13 * This program is distributed in the hope that it will be useful,
14 * but WITHOUT ANY WARRANTY; without even the implied warranty of
15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
16 * GNU General Public License for more details.
17 *
18 * You should have received a copy of the GNU General Public License
19 * along with this program; if not, write to the Free Software
20 * Foundation, Inc., 59 Temple Place, Suite 330, Boston,
21 * MA 02111-1307 USA
22 */
23
24
25#include <config.h>
26#include <version.h>
27
28
29/* memory controller */
30#define BCRX_DEFAULT (0x0000fbe0)
31#define BCRX_MW_8 (0x00000000)
32#define BCRX_MW_16 (0x10000000)
33#define BCRX_MW_32 (0x20000000)
34#define BCRX_PME (0x08000000)
35#define BCRX_WP (0x04000000)
36#define BCRX_WST2_SHIFT (11)
37#define BCRX_WST1_SHIFT (5)
38#define BCRX_IDCY_SHIFT (0)
39
40/* Bank0 Async Flash */
Wolfgang Denk53677ef2008-05-20 16:00:29 +020041#define BCR0 (0x80002000)
wdenkf39748a2004-06-09 13:37:52 +000042#define BCR0_FLASH (BCRX_MW_32 | (0x08<<BCRX_WST2_SHIFT) | (0x0E<<BCRX_WST1_SHIFT))
43
44/* Bank1 Open */
45#define BCR1 (0x80002004)
46
47/* Bank2 Not used (EEPROM?) */
48#define BCR2 (0x80002008)
49
50/* Bank3 Not used */
51#define BCR3 (0x8000200C)
52
53/* Bank4 PC Card1 */
54
55/* Bank5 PC Card2 */
56
57/* Bank6 CPLD IO Controller Peripherals (slow) */
Wolfgang Denk53677ef2008-05-20 16:00:29 +020058#define BCR6 (0x80002018)
wdenkf39748a2004-06-09 13:37:52 +000059#define BCR6_CPLD_SLOW (BCRX_DEFAULT | BCRX_MW_16)
60
61/* Bank7 CPLD IO Controller Peripherals (fast) */
62#define BCR7 (0x8000201C)
63#define BCR7_CPLD_FAST (BCRX_MW_16 | (0x16<<BCRX_WST2_SHIFT) | (0x16<<BCRX_WST1_SHIFT) | (0x2<<BCRX_IDCY_SHIFT))
64
65/* SDRAM */
66#define GBLCNFG (0x80002404)
67#define GC_CKE (0x80000000)
68#define GC_CKSD (0x40000000)
69#define GC_LCR (0x00000040)
70#define GC_SMEMBURST (0x00000020)
71#define GC_MRS (0x00000002)
72#define GC_INIT (0x00000001)
73
74#define GC_CMD_NORMAL (GC_CKE)
75#define GC_CMD_MODE (GC_CKE | GC_MRS)
76#define GC_CMD_SYNCFLASH_LOAD (GC_CKE | GC_MRS | GC_LCR)
77#define GC_CMD_PRECHARGEALL (GC_CKE | GC_INIT)
78#define GC_CMD_NOP (GC_CKE | GC_INIT | GC_MRS)
79
80#define RFSHTMR (0x80002408)
81#define RFSHTMR_INIT (10) /* period=100 ns, HCLK=100Mhz, (2048+1-15.6*66) */
82#define RFSHTMR_NORMAL (1500) /* period=15.6 us, HCLK=100Mhz, (2048+1-15.6*66) */
83
84#define SDCSCX_BASE (0x80002410)
85#define SDCSCX_DEFAULT (0x01220008)
86#define SDCSCX_AUTOPC (0x01000000)
87#define SDCSCX_RAS2CAS_2 (0x00200000)
88#define SDCSCX_RAS2CAS_3 (0x00300000)
89#define SDCSCX_WBL (0x00080000)
90#define SDCSCX_CASLAT_8 (0x00070000)
91#define SDCSCX_CASLAT_7 (0x00060000)
92#define SDCSCX_CASLAT_6 (0x00050000)
93#define SDCSCX_CASLAT_5 (0x00040000)
94#define SDCSCX_CASLAT_4 (0x00030000)
95#define SDCSCX_CASLAT_3 (0x00020000)
96#define SDCSCX_CASLAT_2 (0x00010000)
97#define SDCSCX_2KPAGE (0x00000040)
98#define SDCSCX_SROMLL (0x00000020)
99#define SDCSCX_SROM512 (0x00000010)
100#define SDCSCX_4BNK (0x00000008)
101#define SDCSCX_2BNK (0x00000000)
102#define SDCSCX_EBW_16 (0x00000004)
103#define SDCSCX_EBW_32 (0x00000000)
104
105#define SDRAM_BASE (0xC0000000)
106#define SDCSC_BANK_OFFSET (0x10000000)
107
108/*
109 * The SDRAM DEVICE MODE PROGRAMMING VALUE
110 */
wdenk70f05ac2004-06-09 15:24:18 +0000111#define BURST_LENGTH_4 (2 << 10)
112#define BURST_LENGTH_8 (3 << 10)
113#define WBURST_LENGTH_BL (0 << 19)
114#define WBURST_LENGTH_SINGLE (1 << 19)
115#define CAS_2 (2 << 14)
116#define CAS_3 (3 << 14)
wdenkf39748a2004-06-09 13:37:52 +0000117#define BAT_SEQUENTIAL (0 << 13)
118#define BAT_INTERLEAVED (1 << 13)
wdenk70f05ac2004-06-09 15:24:18 +0000119#define OPM_NORMAL (0 << 17)
wdenkf39748a2004-06-09 13:37:52 +0000120#define SDRAM_DEVICE_MODE (WBURST_LENGTH_BL|OPM_NORMAL|CAS_3|BAT_SEQUENTIAL|BURST_LENGTH_4)
121
122
123#define TIMER1_BASE (0x80000C00)
124
125/*
126 * special lookup flags
127 */
128#define DO_MEM_DELAY 1
129#define DO_MEM_READ 2
130
131_TEXT_BASE:
132 .word TEXT_BASE
133
wdenk400558b2005-04-02 23:52:25 +0000134.globl lowlevel_init
135lowlevel_init:
wdenkf39748a2004-06-09 13:37:52 +0000136 mov r9, lr @ save return address
137
138 /* memory control configuration */
139 /* make r0 relative the current location so that it */
140 /* reads INITMEM_DATA out of FLASH rather than memory ! */
141 /* r0 = current word pointer */
142 /* r1 = end word location, one word past last actual word */
143 /* r3 = address for writes, special lookup flags */
144 /* r4 = value for writes, delay constants, or read addresses */
145 /* r2 = location for mem reads */
146
147 ldr r0, =INITMEM_DATA
148 ldr r1, _TEXT_BASE
149 sub r0, r0, r1
150 add r1, r0, #112
151
152mem_loop:
153 cmp r1, r0
154 moveq pc, r9 @ Done
155
156 ldr r3, [r0], #4 @ Fetch Destination Register Address, or 1 for delay
157 ldr r4, [r0], #4 @ value
158
159 cmp r3, #DO_MEM_DELAY
160 bleq mem_delay
161 beq mem_loop
162 cmp r3, #DO_MEM_READ
163 ldreq r2, [r4]
164 beq mem_loop
165 str r4, [r3] @ normal register/ram store
166 b mem_loop
167
168mem_delay:
169 ldr r5, =TIMER1_BASE
170 mov r6, r4, LSR #1 @ timer resolution is ~2us
171 str r6, [r5]
172 mov r6, #0x88 @ using 508.469KHz clock, enable
173 str r6, [r5, #8]
1740: ldr r6, [r5, #4] @ timer value
175 cmp r6, #0
176 bne 0b
177 mov r6, #0 @ disable timer
178 str r6, [r5, #8]
179 mov pc, lr
180
181 .ltorg
182/* the literal pools origin */
183
184INITMEM_DATA:
185 .word BCR0
186 .word BCR0_FLASH
187 .word BCR6
188 .word BCR6_CPLD_SLOW
189 .word BCR7
190 .word BCR7_CPLD_FAST
191 .word SDCSCX_BASE
192 .word (SDCSCX_RAS2CAS_3 | SDCSCX_CASLAT_3 | SDCSCX_SROMLL | SDCSCX_4BNK | SDCSCX_EBW_32)
193 .word GBLCNFG
194 .word GC_CMD_NOP
195 .word DO_MEM_DELAY
196 .word 200
197 .word GBLCNFG
198 .word GC_CMD_PRECHARGEALL
199 .word RFSHTMR
200 .word RFSHTMR_INIT
201 .word DO_MEM_DELAY
202 .word 8
203 .word RFSHTMR
204 .word RFSHTMR_NORMAL
205 .word GBLCNFG
206 .word GC_CMD_MODE
207 .word DO_MEM_READ
208 .word (SDRAM_BASE | SDRAM_DEVICE_MODE)
209 .word GBLCNFG
210 .word GC_CMD_NORMAL
211 .word SDCSCX_BASE
212 .word (SDCSCX_AUTOPC | SDCSCX_RAS2CAS_3 | SDCSCX_CASLAT_3 | SDCSCX_SROMLL | SDCSCX_4BNK | SDCSCX_EBW_32)