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Diffstat (limited to 'board/integratorap/lowlevel_init.S')
| -rw-r--r-- | board/integratorap/lowlevel_init.S | 213 |
1 files changed, 213 insertions, 0 deletions
diff --git a/board/integratorap/lowlevel_init.S b/board/integratorap/lowlevel_init.S new file mode 100644 index 0000000..1aacbf4 --- /dev/null +++ b/board/integratorap/lowlevel_init.S @@ -0,0 +1,213 @@ +/* + * Board specific setup info + * + * (C) Copyright 2004, ARM Ltd. + * Philippe Robin, <philippe.robin@arm.com> + * + * See file CREDITS for list of people who contributed to this + * project. + * + * This program is free software; you can redistribute it and/or + * modify it under the terms of the GNU General Public License as + * published by the Free Software Foundation; either version 2 of + * the License, or (at your option) any later version. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + * + * You should have received a copy of the GNU General Public License + * along with this program; if not, write to the Free Software + * Foundation, Inc., 59 Temple Place, Suite 330, Boston, + * MA 02111-1307 USA + */ + +#include <config.h> +#include <version.h> + + /* Reset using CM control register */ +.global reset_cpu +reset_cpu: + mov r0, #CM_BASE + ldr r1,[r0,#OS_CTRL] + orr r1,r1,#CMMASK_RESET + str r1,[r0,#OS_CTRL] + +reset_failed: + b reset_failed + +/* Set up the platform, once the cpu has been initialized */ +.globl lowlevel_init +lowlevel_init: + /* If U-Boot has been run after the ARM boot monitor + * then all the necessary actions have been done + * otherwise we are running from user flash mapped to 0x00000000 + * --- DO NOT REMAP BEFORE THE CODE HAS BEEN RELOCATED -- + * Changes to the (possibly soft) reset defaults of the processor + * itself should be performed in cpu/arm<>/start.S + * This function affects only the core module or board settings + */ + +#ifdef CONFIG_CM_INIT + /* CM has an initialization register + * - bits in it are wired into test-chip pins to force + * reset defaults + * - may need to change its contents for U-Boot + */ + + /* set the desired CM specific value */ + mov r2,#CMMASK_LOWVEC /* Vectors at 0x00000000 for all */ + +#if defined (CONFIG_CM10200E) || defined (CONFIG_CM10220E) + orr r2,r2,#CMMASK_INIT_102 +#else + +#if !defined (CONFIG_CM920T) && !defined (CONFIG_CM920T_ETM) && \ + !defined (CONFIG_CM940T) + +#ifdef CONFIG_CM_MULTIPLE_SSRAM + /* set simple mapping */ + and r2,r2,#CMMASK_MAP_SIMPLE +#endif /* #ifdef CONFIG_CM_MULTIPLE_SSRAM */ + +#ifdef CONFIG_CM_TCRAM + /* disable TCRAM */ + and r2,r2,#CMMASK_TCRAM_DISABLE +#endif /* #ifdef CONFIG_CM_TCRAM */ + +#if defined (CONFIG_CM926EJ_S) || defined (CONFIG_CM1026EJ_S) || \ + defined (CONFIG_CM1136JF_S) + + and r2,r2,#CMMASK_LE + +#endif /* cpu with little endian initialization */ + + orr r2,r2,#CMMASK_CMxx6_COMMON + +#endif /* CMxx6 code */ + +#endif /* ARM102xxE value */ + + /* read CM_INIT */ + mov r0, #CM_BASE + ldr r1, [r0, #OS_INIT] + /* check against desired bit setting */ + and r3,r1,r2 + cmp r3,r2 + beq init_reg_OK + + /* lock for change */ + mov r3, #CMVAL_LOCK1 + add r3,r3,#CMVAL_LOCK2 + str r3, [r0, #OS_LOCK] + /* set desired value */ + orr r1,r1,r2 + /* write & relock CM_INIT */ + str r1, [r0, #OS_INIT] + mov r1, #CMVAL_UNLOCK + str r1, [r0, #OS_LOCK] + + /* soft reset so new values used */ + b reset_cpu + +init_reg_OK: + +#endif /* CONFIG_CM_INIT */ + + mov pc, lr + +#ifdef CONFIG_CM_SPD_DETECT + /* Fast memory is available for the DRAM data + * - ensure it has been transferred, then summarize the data + * into a CM register + */ +.globl dram_query +dram_query: + stmfd r13!,{r4-r6,lr} + /* set up SDRAM info */ + /* - based on example code from the CM User Guide */ + mov r0, #CM_BASE + +readspdbit: + ldr r1, [r0, #OS_SDRAM] /* read the SDRAM register */ + and r1, r1, #0x20 /* mask SPD bit (5) */ + cmp r1, #0x20 /* test if set */ + bne readspdbit + +setupsdram: + add r0, r0, #OS_SPD /* address the copy of the SDP data */ + ldrb r1, [r0, #3] /* number of row address lines */ + ldrb r2, [r0, #4] /* number of column address lines */ + ldrb r3, [r0, #5] /* number of banks */ + ldrb r4, [r0, #31] /* module bank density */ + mul r5, r4, r3 /* size of SDRAM (MB divided by 4) */ + mov r5, r5, ASL#2 /* size in MB */ + mov r0, #CM_BASE /* reload for later code */ + cmp r5, #0x10 /* is it 16MB? */ + bne not16 + mov r6, #0x2 /* store size and CAS latency of 2 */ + b writesize + +not16: + cmp r5, #0x20 /* is it 32MB? */ + bne not32 + mov r6, #0x6 + b writesize + +not32: + cmp r5, #0x40 /* is it 64MB? */ + bne not64 + mov r6, #0xa + b writesize + +not64: + cmp r5, #0x80 /* is it 128MB? */ + bne not128 + mov r6, #0xe + b writesize + +not128: + /* if it is none of these sizes then it is either 256MB, or + * there is no SDRAM fitted so default to 256MB + */ + mov r6, #0x12 + +writesize: + mov r1, r1, ASL#8 /* row addr lines from SDRAM reg */ + orr r2, r1, r2, ASL#12 /* OR in column address lines */ + orr r3, r2, r3, ASL#16 /* OR in number of banks */ + orr r6, r6, r3 /* OR in size and CAS latency */ + str r6, [r0, #OS_SDRAM] /* store SDRAM parameters */ + +#endif /* #ifdef CONFIG_CM_SPD_DETECT */ + + ldmfd r13!,{r4-r6,pc} /* back to caller */ + +#ifdef CONFIG_CM_REMAP + /* CM remap bit is operational + * - use it to map writeable memory at 0x00000000, in place of flash + */ +.globl cm_remap +cm_remap: + stmfd r13!,{r4-r10,lr} + + mov r0, #CM_BASE + ldr r1, [r0, #OS_CTRL] + orr r1, r1, #CMMASK_REMAP /* set remap and led bits */ + str r1, [r0, #OS_CTRL] + + /* Now 0x00000000 is writeable, replace the vectors */ + ldr r0, =_start /* r0 <- start of vectors */ + ldr r2, =_armboot_start /* r2 <- past vectors */ + sub r1,r1,r1 /* destination 0x00000000 */ + +copy_vec: + ldmia r0!, {r3-r10} /* copy from source address [r0] */ + stmia r1!, {r3-r10} /* copy to target address [r1] */ + cmp r0, r2 /* until source end address [r2] */ + ble copy_vec + + ldmfd r13!,{r4-r10,pc} /* back to caller */ + +#endif /* #ifdef CONFIG_CM_REMAP */ |