2 * Board specific setup info
4 * (C) Copyright 2004, ARM Ltd.
5 * Philippe Robin, <philippe.robin@arm.com>
7 * See file CREDITS for list of people who contributed to this
10 * This program is free software; you can redistribute it and/or
11 * modify it under the terms of the GNU General Public License as
12 * published by the Free Software Foundation; either version 2 of
13 * the License, or (at your option) any later version.
15 * This program is distributed in the hope that it will be useful,
16 * but WITHOUT ANY WARRANTY; without even the implied warranty of
17 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
18 * GNU General Public License for more details.
20 * You should have received a copy of the GNU General Public License
21 * along with this program; if not, write to the Free Software
22 * Foundation, Inc., 59 Temple Place, Suite 330, Boston,
29 /* Reset using CM control register */
34 orr r1,r1,#CMMASK_RESET
40 /* Set up the platform, once the cpu has been initialized */
43 /* If U-Boot has been run after the ARM boot monitor
44 * then all the necessary actions have been done
45 * otherwise we are running from user flash mapped to 0x00000000
46 * --- DO NOT REMAP BEFORE THE CODE HAS BEEN RELOCATED --
47 * Changes to the (possibly soft) reset defaults of the processor
48 * itself should be performed in cpu/arm<>/start.S
49 * This function affects only the core module or board settings
53 /* CM has an initialization register
54 * - bits in it are wired into test-chip pins to force
56 * - may need to change its contents for U-Boot
59 /* set the desired CM specific value */
60 mov r2,#CMMASK_LOWVEC /* Vectors at 0x00000000 for all */
62 #if defined (CONFIG_CM10200E) || defined (CONFIG_CM10220E)
63 orr r2,r2,#CMMASK_INIT_102
66 #if !defined (CONFIG_CM920T) && !defined (CONFIG_CM920T_ETM) && \
67 !defined (CONFIG_CM940T)
69 #ifdef CONFIG_CM_MULTIPLE_SSRAM
70 /* set simple mapping */
71 and r2,r2,#CMMASK_MAP_SIMPLE
72 #endif /* #ifdef CONFIG_CM_MULTIPLE_SSRAM */
74 #ifdef CONFIG_CM_TCRAM
76 and r2,r2,#CMMASK_TCRAM_DISABLE
77 #endif /* #ifdef CONFIG_CM_TCRAM */
79 #if defined (CONFIG_CM926EJ_S) || defined (CONFIG_CM1026EJ_S) || \
80 defined (CONFIG_CM1136JF_S)
84 #endif /* cpu with little endian initialization */
86 orr r2,r2,#CMMASK_CMxx6_COMMON
88 #endif /* CMxx6 code */
90 #endif /* ARM102xxE value */
94 ldr r1, [r0, #OS_INIT]
95 /* check against desired bit setting */
100 /* lock for change */
102 add r3,r3,#CMVAL_LOCK2
103 str r3, [r0, #OS_LOCK]
104 /* set desired value */
106 /* write & relock CM_INIT */
107 str r1, [r0, #OS_INIT]
108 mov r1, #CMVAL_UNLOCK
109 str r1, [r0, #OS_LOCK]
111 /* soft reset so new values used */
116 #endif /* CONFIG_CM_INIT */
120 #ifdef CONFIG_CM_SPD_DETECT
121 /* Fast memory is available for the DRAM data
122 * - ensure it has been transferred, then summarize the data
127 stmfd r13!,{r4-r6,lr}
128 /* set up SDRAM info */
129 /* - based on example code from the CM User Guide */
133 ldr r1, [r0, #OS_SDRAM] /* read the SDRAM register */
134 and r1, r1, #0x20 /* mask SPD bit (5) */
135 cmp r1, #0x20 /* test if set */
139 add r0, r0, #OS_SPD /* address the copy of the SDP data */
140 ldrb r1, [r0, #3] /* number of row address lines */
141 ldrb r2, [r0, #4] /* number of column address lines */
142 ldrb r3, [r0, #5] /* number of banks */
143 ldrb r4, [r0, #31] /* module bank density */
144 mul r5, r4, r3 /* size of SDRAM (MB divided by 4) */
145 mov r5, r5, ASL#2 /* size in MB */
146 mov r0, #CM_BASE /* reload for later code */
147 cmp r5, #0x10 /* is it 16MB? */
149 mov r6, #0x2 /* store size and CAS latency of 2 */
153 cmp r5, #0x20 /* is it 32MB? */
159 cmp r5, #0x40 /* is it 64MB? */
165 cmp r5, #0x80 /* is it 128MB? */
171 /* if it is none of these sizes then it is either 256MB, or
172 * there is no SDRAM fitted so default to 256MB
177 mov r1, r1, ASL#8 /* row addr lines from SDRAM reg */
178 orr r2, r1, r2, ASL#12 /* OR in column address lines */
179 orr r3, r2, r3, ASL#16 /* OR in number of banks */
180 orr r6, r6, r3 /* OR in size and CAS latency */
181 str r6, [r0, #OS_SDRAM] /* store SDRAM parameters */
183 #endif /* #ifdef CONFIG_CM_SPD_DETECT */
185 ldmfd r13!,{r4-r6,pc} /* back to caller */
187 #ifdef CONFIG_CM_REMAP
188 /* CM remap bit is operational
189 * - use it to map writeable memory at 0x00000000, in place of flash
193 stmfd r13!,{r4-r10,lr}
196 ldr r1, [r0, #OS_CTRL]
197 orr r1, r1, #CMMASK_REMAP /* set remap and led bits */
198 str r1, [r0, #OS_CTRL]
200 /* Now 0x00000000 is writeable, replace the vectors */
201 ldr r0, =_start /* r0 <- start of vectors */
202 ldr r2, =_armboot_start /* r2 <- past vectors */
203 sub r1,r1,r1 /* destination 0x00000000 */
206 ldmia r0!, {r3-r10} /* copy from source address [r0] */
207 stmia r1!, {r3-r10} /* copy to target address [r1] */
208 cmp r0, r2 /* until source end address [r2] */
211 ldmfd r13!,{r4-r10,pc} /* back to caller */
213 #endif /* #ifdef CONFIG_CM_REMAP */