1 /* SPDX-License-Identifier: GPL-2.0+ */
3 * Board specific setup info
5 * (C) Copyright 2004, ARM Ltd.
6 * Philippe Robin, <philippe.robin@arm.com>
10 #include <armcoremodule.h>
12 /* Reset using CM control register */
17 orr r1,r1,#CMMASK_RESET
23 /* Set up the platform, once the cpu has been initialized */
26 /* If U-Boot has been run after the ARM boot monitor
27 * then all the necessary actions have been done
28 * otherwise we are running from user flash mapped to 0x00000000
29 * --- DO NOT REMAP BEFORE THE CODE HAS BEEN RELOCATED --
30 * Changes to the (possibly soft) reset defaults of the processor
31 * itself should be performed in cpu/arm<>/start.S
32 * This function affects only the core module or board settings
36 /* CM has an initialization register
37 * - bits in it are wired into test-chip pins to force
39 * - may need to change its contents for U-Boot
42 /* set the desired CM specific value */
43 mov r2,#CMMASK_LOWVEC /* Vectors at 0x00000000 for all */
45 #if !defined (CONFIG_CM920T) && !defined (CONFIG_CM920T_ETM) && \
46 !defined (CONFIG_CM940T)
48 #ifdef CONFIG_CM_MULTIPLE_SSRAM
49 /* set simple mapping */
50 and r2,r2,#CMMASK_MAP_SIMPLE
51 #endif /* #ifdef CONFIG_CM_MULTIPLE_SSRAM */
53 #ifdef CONFIG_CM_TCRAM
55 and r2,r2,#CMMASK_TCRAM_DISABLE
56 #endif /* #ifdef CONFIG_CM_TCRAM */
58 #if defined (CONFIG_CM926EJ_S) || defined (CONFIG_CM1026EJ_S) || \
59 defined (CONFIG_CM1136JF_S)
63 #endif /* cpu with little endian initialization */
65 orr r2,r2,#CMMASK_CMxx6_COMMON
67 #endif /* CMxx6 code */
71 ldr r1, [r0, #OS_INIT]
72 /* check against desired bit setting */
79 add r3,r3,#CMVAL_LOCK2
80 str r3, [r0, #OS_LOCK]
81 /* set desired value */
83 /* write & relock CM_INIT */
84 str r1, [r0, #OS_INIT]
86 str r1, [r0, #OS_LOCK]
88 /* soft reset so new values used */
93 #endif /* CONFIG_CM_INIT */
97 #ifdef CONFIG_CM_SPD_DETECT
98 /* Fast memory is available for the DRAM data
99 * - ensure it has been transferred, then summarize the data
104 stmfd r13!,{r4-r6,lr}
105 /* set up SDRAM info */
106 /* - based on example code from the CM User Guide */
110 ldr r1, [r0, #OS_SDRAM] /* read the SDRAM register */
111 and r1, r1, #0x20 /* mask SPD bit (5) */
112 cmp r1, #0x20 /* test if set */
116 add r0, r0, #OS_SPD /* address the copy of the SDP data */
117 ldrb r1, [r0, #3] /* number of row address lines */
118 ldrb r2, [r0, #4] /* number of column address lines */
119 ldrb r3, [r0, #5] /* number of banks */
120 ldrb r4, [r0, #31] /* module bank density */
121 mul r5, r4, r3 /* size of SDRAM (MB divided by 4) */
122 mov r5, r5, ASL#2 /* size in MB */
123 mov r0, #CM_BASE /* reload for later code */
124 cmp r5, #0x10 /* is it 16MB? */
126 mov r6, #0x2 /* store size and CAS latency of 2 */
130 cmp r5, #0x20 /* is it 32MB? */
136 cmp r5, #0x40 /* is it 64MB? */
142 cmp r5, #0x80 /* is it 128MB? */
148 /* if it is none of these sizes then it is either 256MB, or
149 * there is no SDRAM fitted so default to 256MB
154 mov r1, r1, ASL#8 /* row addr lines from SDRAM reg */
155 orr r2, r1, r2, ASL#12 /* OR in column address lines */
156 orr r3, r2, r3, ASL#16 /* OR in number of banks */
157 orr r6, r6, r3 /* OR in size and CAS latency */
158 str r6, [r0, #OS_SDRAM] /* store SDRAM parameters */
160 #endif /* #ifdef CONFIG_CM_SPD_DETECT */
162 ldmfd r13!,{r4-r6,pc} /* back to caller */
164 #ifdef CONFIG_CM_REMAP
165 /* CM remap bit is operational
166 * - use it to map writeable memory at 0x00000000, in place of flash
170 stmfd r13!,{r4-r10,lr}
173 ldr r1, [r0, #OS_CTRL]
174 orr r1, r1, #CMMASK_REMAP /* set remap and led bits */
175 str r1, [r0, #OS_CTRL]
177 /* Now 0x00000000 is writeable, replace the vectors */
178 ldr r0, =_start /* r0 <- start of vectors */
179 add r2, r0, #64 /* r2 <- past vectors */
180 sub r1,r1,r1 /* destination 0x00000000 */
183 ldmia r0!, {r3-r10} /* copy from source address [r0] */
184 stmia r1!, {r3-r10} /* copy to target address [r1] */
185 cmp r0, r2 /* until source end address [r2] */
188 ldmfd r13!,{r4-r10,pc} /* back to caller */
190 #endif /* #ifdef CONFIG_CM_REMAP */