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/*
* Most of this taken from Redboot hal_platform_setup.h with cleanup
*
* NOTE: I haven't clean this up considerably, just enough to get it
* running. See hal_platform_setup.h for the source. See
* board/cradle/lowlevel_init.S for another PXA250 setup that is
* much cleaner.
*
* 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 CFG_DRAM_SIZE
/* wait for coprocessor write complete */
.macro CPWAIT reg
mrc p15,0,\reg,c2,c0,0
mov \reg,\reg
sub pc,pc,#4
.endm
/*
* Memory setup
*/
.globl lowlevel_init
lowlevel_init:
/* Set up GPIO pins first ----------------------------------------- */
mov r10, lr
/* GPIO41, 42, 43, 44, 45, 46, 47, 48 */
ldr r0, =0x40E10438 @ GPIO41 FFRXD
ldr r1, =0x802
str r1, [r0]
ldr r0, =0x40E1043C @ GPIO42 FFTXD
ldr r1, =0x802
str r1, [r0]
ldr r0, =0x40E10440 @ GPIO43 FFCTS
ldr r1, =0x802
str r1, [r0]
ldr r0, =0x40E10444 @ GPIO 44 FFDCD
ldr r1, =0x802
str r1, [r0]
ldr r0, =0x40E10448 @ GPIO 45 FFDSR
ldr r1, =0x802
str r1, [r0]
ldr r0, =0x40E1044C @ GPIO 46 FFRI
ldr r1, =0x802
str r1, [r0]
ldr r0, =0x40E10450 @ GPIO 47 FFDTR
ldr r1, =0x802
str r1, [r0]
ldr r0, =0x40E10454 @ GPIO 48
ldr r1, =0x802
str r1, [r0]
/* tebrandt - ASCR, clear the RDH bit */
ldr r0, =ASCR
ldr r1, [r0]
bic r1, r1, #0x80000000
str r1, [r0]
/* ---------------------------------------------------------------- */
/* Enable memory interface */
/* */
/* The sequence below is based on the recommended init steps */
/* detailed in the Intel PXA250 Operating Systems Developers Guide, */
/* Chapter 10. */
/* ---------------------------------------------------------------- */
/* ---------------------------------------------------------------- */
/* Step 1: Wait for at least 200 microsedonds to allow internal */
/* clocks to settle. Only necessary after hard reset... */
/* FIXME: can be optimized later */
/* ---------------------------------------------------------------- */
ldr r3, =OSCR /* reset the OS Timer Count to zero */
mov r2, #0
str r2, [r3]
ldr r4, =0x300 /* really 0x2E1 is about 200usec, */
/* so 0x300 should be plenty */
1:
ldr r2, [r3]
cmp r4, r2
bgt 1b
mem_init:
/* configure the MEMCLKCFG register */
ldr r1, =MEMCLKCFG
ldr r2, =0x00010001
str r2, [r1] @ WRITE
ldr r2, [r1] @ DELAY UNTIL WRITTEN
/* set CSADRCFG[0] to data flash SRAM mode */
ldr r1, =CSADRCFG0
ldr r2, =0x00320809
str r2, [r1] @ WRITE
ldr r2, [r1] @ DELAY UNTIL WRITTEN
/* set CSADRCFG[1] to data flash SRAM mode */
ldr r1, =CSADRCFG1
ldr r2, =0x00320809
str r2, [r1] @ WRITE
ldr r2, [r1] @ DELAY UNTIL WRITTEN
/* set MSC 0 register for SRAM memory */
ldr r1, =MSC0
ldr r2, =0x11191119
str r2, [r1] @ WRITE
ldr r2, [r1] @ DELAY UNTIL WRITTEN
/* set CSADRCFG[2] to data flash SRAM mode */
ldr r1, =CSADRCFG2
ldr r2, =0x00320809
str r2, [r1] @ WRITE
ldr r2, [r1] @ DELAY UNTIL WRITTEN
/* set CSADRCFG[3] to VLIO mode */
ldr r1, =CSADRCFG3
ldr r2, =0x0032080B
str r2, [r1] @ WRITE
ldr r2, [r1] @ DELAY UNTIL WRITTEN
/* set MSC 1 register for VLIO memory */
ldr r1, =MSC1
ldr r2, =0x123C1119
str r2, [r1] @ WRITE
ldr r2, [r1] @ DELAY UNTIL WRITTEN
#if 0
/* This does not work in Zylonite. -SC */
ldr r0, =0x15fffff0
ldr r1, =0xb10b
str r1, [r0]
str r1, [r0, #4]
#endif
/* Configure ACCR Register */
ldr r0, =ACCR @ ACCR
ldr r1, =0x0180b108
str r1, [r0]
ldr r1, [r0]
/* Configure MDCNFG Register */
ldr r0, =MDCNFG @ MDCNFG
ldr r1, =0x403
str r1, [r0]
ldr r1, [r0]
/* Perform Resistive Compensation by configuring RCOMP register */
ldr r1, =RCOMP @ RCOMP
ldr r2, =0x000000ff
str r2, [r1]
ldr r2, [r1]
/* Configure MDMRS Register for SDCS0 */
ldr r1, =MDMRS @ MDMRS
ldr r2, =0x60000023
ldr r3, [r1]
orr r2, r2, r3
str r2, [r1]
ldr r2, [r1]
/* Configure MDMRS Register for SDCS1 */
ldr r1, =MDMRS @ MDMRS
ldr r2, =0xa0000023
ldr r3, [r1]
orr r2, r2, r3
str r2, [r1]
ldr r2, [r1]
/* Configure MDREFR */
ldr r1, =MDREFR @ MDREFR
ldr r2, =0x00000006
str r2, [r1]
ldr r2, [r1]
/* Configure EMPI */
ldr r1, =EMPI @ EMPI
ldr r2, =0x80000000
str r2, [r1]
ldr r2, [r1]
/* DDR Read-Strobe Delay Calibration */
/* bl ddr_calibration */
/* Here we assume the hardware calibration alwasy be successful. -SC */
/* Set DMCEN bit in MDCNFG Register */
ldr r0, =MDCNFG @ MDCNFG
ldr r1, [r0]
orr r1, r1, #0x40000000 @ enable SDRAM for Normal Access
str r1, [r0]
/* scrub/init SDRAM if enabled/present */
ldr r11, =0xa0000000 //RAM_BASE // base address of SDRAM
ldr r12, =0x04000000 // size of memory to scrub
mov r8,r12 // save 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 r12, r12, #32 // 32 bytes/line
stmia r11!, {r0-r7}
beq 15f
b 10b
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
/* We are finished with Intel's memory controller initialisation */
/* ---------------------------------------------------------------- */
/* End lowlevel_init */
/* ---------------------------------------------------------------- */
endlowlevel_init:
mov pc, lr
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