/* * 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 */