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/*
* (C) Copyright 2006 DENX Software Engineering
*
* 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>
#include <asm/arch/pxa-regs.h>
DRAM_SIZE: .long CONFIG_SYS_DRAM_SIZE
.macro wait time
ldr r2, =OSCR
mov r3, #0
str r3, [r2]
0:
ldr r3, [r2]
cmp r3, \time
bls 0b
.endm
.globl lowlevel_init
lowlevel_init:
/* Set up GPIO pins first */
mov r10, lr
/* Configure GPIO Pins 97, 98 UART1 / altern. Fkt. 1 */
ldr r0, =GPIO97
ldr r1, =0x801
str r1, [r0]
ldr r0, =GPIO98
ldr r1, =0x801
str r1, [r0]
/* tebrandt - ASCR, clear the RDH bit */
ldr r0, =ASCR
ldr r1, [r0]
bic r1, r1, #0x80000000
str r1, [r0]
mem_init:
/* Configure ACCR Register - enable DMEMC Clock at 260 / 2 MHz */
ldr r0, =ACCR
ldr r1, [r0]
orr r1, r1, #0x3000
str r1, [r0]
ldr r1, [r0]
/* 2. Programm MDCNFG, leaving DMCEN de-asserted */
ldr r0, =MDCNFG
ldr r1, =(MDCNFG_DMAP | MDCNFG_DTYPE | MDCNFG_DTC_2 | MDCNFG_DCSE0 | MDCNFG_DRAC_13)
/* ldr r1, =0x80000403 */
str r1, [r0]
ldr r1, [r0] /* delay until written */
/* 3. wait nop power up waiting period (200ms)
* optimization: Steps 4+6 can be done during this
*/
wait #300
/* 4. Perform an initial Rcomp-calibration cycle */
ldr r0, =RCOMP
ldr r1, =0x80000000
str r1, [r0]
ldr r1, [r0] /* delay until written */
/* missing: program for automatic rcomp evaluation cycles */
/* 5. DDR DRAM strobe delay calibration */
ldr r0, =DDR_HCAL
ldr r1, =0x88000007
str r1, [r0]
wait #5
ldr r1, [r0] /* delay until written */
/* Set MDMRS */
ldr r0, =MDMRS
ldr r1, =0x60000033
str r1, [r0]
wait #300
/* Configure MDREFR */
ldr r0, =MDREFR
ldr r1, =0x00000006
str r1, [r0]
ldr r1, [r0]
/* Enable the dynamic memory controller */
ldr r0, =MDCNFG
ldr r1, [r0]
orr r1, r1, #MDCNFG_DMCEN
str r1, [r0]
#ifndef CONFIG_SYS_SKIP_DRAM_SCRUB
/* scrub/init SDRAM if enabled/present */
ldr r8, =CONFIG_SYS_DRAM_BASE /* base address of SDRAM (CONFIG_SYS_DRAM_BASE) */
ldr r9, =CONFIG_SYS_DRAM_SIZE /* size of memory to scrub (CONFIG_SYS_DRAM_SIZE) */
mov r0, #0 /* scrub with 0x0000:0000 */
mov r1, #0
mov r2, #0
mov r3, #0
mov r4, #0
mov r5, #0
mov r6, #0
mov r7, #0
10: /* fastScrubLoop */
subs r9, r9, #32 /* 8 words/line */
stmia r8!, {r0-r7}
beq 15f
b 10b
#endif /* CONFIG_SYS_SKIP_DRAM_SCRUB */
15:
/* Mask all interrupts */
mov r1, #0
mcr p6, 0, r1, c1, c0, 0 @ ICMR
/* Disable software and data breakpoints */
mov r0, #0
mcr p15,0,r0,c14,c8,0 /* ibcr0 */
mcr p15,0,r0,c14,c9,0 /* ibcr1 */
mcr p15,0,r0,c14,c4,0 /* dbcon */
/* Enable all debug functionality */
mov r0,#0x80000000
mcr p14,0,r0,c10,c0,0 /* dcsr */
endlowlevel_init:
mov pc, lr
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