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u-boot/board/xm250/lowlevel_init.S
Jean-Christophe PLAGNIOL-VILLARD 6d0f6bcf33 rename CFG_ macros to CONFIG_SYS 
Signed-off-by: Jean-Christophe PLAGNIOL-VILLARD <plagnioj@jcrosoft.com>
2008-10-18 21:54:03 +02:00

519 lines
9.7 KiB
ArmAsm
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/*
* Most of this taken from Redboot hal_platform_setup.h with cleanup
*
* 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
/* wait for coprocessor write complete */
.macro CPWAIT reg
mrc p15,0,\reg,c2,c0,0
mov \reg,\reg
sub pc,pc,#4
.endm
/*
.macro SET_LED val
ldr r6, =CRADLE_LED_CLR_REG
ldr r7, =0
str r7, [r6]
ldr r6, =CRADLE_LED_SET_REG
ldr r7, =\val
str r7, [r6]
.endm
*/
.globl lowlevel_init
lowlevel_init:
mov r10, lr
/* Set up GPIO pins first */
ldr r0, =GPSR0
ldr r1, =CONFIG_SYS_GPSR0_VAL
str r1, [r0]
ldr r0, =GPSR1
ldr r1, =CONFIG_SYS_GPSR1_VAL
str r1, [r0]
ldr r0, =GPSR2
ldr r1, =CONFIG_SYS_GPSR2_VAL
str r1, [r0]
ldr r0, =GPCR0
ldr r1, =CONFIG_SYS_GPCR0_VAL
str r1, [r0]
ldr r0, =GPCR1
ldr r1, =CONFIG_SYS_GPCR1_VAL
str r1, [r0]
ldr r0, =GPCR2
ldr r1, =CONFIG_SYS_GPCR2_VAL
str r1, [r0]
ldr r0, =GRER0
ldr r1, =CONFIG_SYS_GRER0_VAL
str r1, [r0]
ldr r0, =GRER1
ldr r1, =CONFIG_SYS_GRER1_VAL
str r1, [r0]
ldr r0, =GRER2
ldr r1, =CONFIG_SYS_GRER2_VAL
str r1, [r0]
ldr r0, =GFER0
ldr r1, =CONFIG_SYS_GFER0_VAL
str r1, [r0]
ldr r0, =GFER1
ldr r1, =CONFIG_SYS_GFER1_VAL
str r1, [r0]
ldr r0, =GFER2
ldr r1, =CONFIG_SYS_GFER2_VAL
str r1, [r0]
ldr r0, =GPDR0
ldr r1, =CONFIG_SYS_GPDR0_VAL
str r1, [r0]
ldr r0, =GPDR1
ldr r1, =CONFIG_SYS_GPDR1_VAL
str r1, [r0]
ldr r0, =GPDR2
ldr r1, =CONFIG_SYS_GPDR2_VAL
str r1, [r0]
ldr r0, =GAFR0_L
ldr r1, =CONFIG_SYS_GAFR0_L_VAL
str r1, [r0]
ldr r0, =GAFR0_U
ldr r1, =CONFIG_SYS_GAFR0_U_VAL
str r1, [r0]
ldr r0, =GAFR1_L
ldr r1, =CONFIG_SYS_GAFR1_L_VAL
str r1, [r0]
ldr r0, =GAFR1_U
ldr r1, =CONFIG_SYS_GAFR1_U_VAL
str r1, [r0]
ldr r0, =GAFR2_L
ldr r1, =CONFIG_SYS_GAFR2_L_VAL
str r1, [r0]
ldr r0, =GAFR2_U
ldr r1, =CONFIG_SYS_GAFR2_U_VAL
str r1, [r0]
/* enable GPIO pins */
ldr r0, =PSSR
ldr r1, =CONFIG_SYS_PSSR_VAL
str r1, [r0]
/* SET_LED 1 */
ldr r3, =MSC1 /* low - bank 2 Lubbock Registers / SRAM */
ldr r2, =CONFIG_SYS_MSC1_VAL /* high - bank 3 Ethernet Controller */
str r2, [r3] /* need to set MSC1 before trying to write to the HEX LEDs */
ldr r2, [r3] /* need to read it back to make sure the value latches (see MSC section of manual) */
/*********************************************************************
* Initlialize Memory Controller
*
* See PXA250 Operating System Developer's Guide
*
* pause for 200 uSecs- allow internal clocks to settle
* *Note: only need this if hard reset... doing it anyway for now
*/
@ Step 1
@ ---- Wait 200 usec
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
/* SET_LED 2 */
mem_init:
@ get memory controller base address
ldr r1, =MEMC_BASE
@****************************************************************************
@ Step 2
@
@ Step 2a
@ write msc0, read back to ensure data latches
@
ldr r2, =CONFIG_SYS_MSC0_VAL
str r2, [r1, #MSC0_OFFSET]
ldr r2, [r1, #MSC0_OFFSET]
@ write msc1
ldr r2, =CONFIG_SYS_MSC1_VAL
str r2, [r1, #MSC1_OFFSET]
ldr r2, [r1, #MSC1_OFFSET]
@ write msc2
ldr r2, =CONFIG_SYS_MSC2_VAL
str r2, [r1, #MSC2_OFFSET]
ldr r2, [r1, #MSC2_OFFSET]
@ Step 2b
@ write mecr
ldr r2, =CONFIG_SYS_MECR_VAL
str r2, [r1, #MECR_OFFSET]
@ write mcmem0
ldr r2, =CONFIG_SYS_MCMEM0_VAL
str r2, [r1, #MCMEM0_OFFSET]
@ write mcmem1
ldr r2, =CONFIG_SYS_MCMEM1_VAL
str r2, [r1, #MCMEM1_OFFSET]
@ write mcatt0
ldr r2, =CONFIG_SYS_MCATT0_VAL
str r2, [r1, #MCATT0_OFFSET]
@ write mcatt1
ldr r2, =CONFIG_SYS_MCATT1_VAL
str r2, [r1, #MCATT1_OFFSET]
@ write mcio0
ldr r2, =CONFIG_SYS_MCIO0_VAL
str r2, [r1, #MCIO0_OFFSET]
@ write mcio1
ldr r2, =CONFIG_SYS_MCIO1_VAL
str r2, [r1, #MCIO1_OFFSET]
/*SET_LED 3 */
@ Step 2c
@ fly-by-dma is defeatured on this part
@ write flycnfg
@ldr r2, =CONFIG_SYS_FLYCNFG_VAL
@str r2, [r1, #FLYCNFG_OFFSET]
/* FIXME Does this sequence really make sense */
#ifdef REDBOOT_WAY
@ Step 2d
@ get the mdrefr settings
ldr r3, =CONFIG_SYS_MDREFR_VAL
@ extract DRI field (we need a valid DRI field)
@
ldr r2, =0xFFF
@ valid DRI field in r3
@
and r3, r3, r2
@ get the reset state of MDREFR
@
ldr r4, [r1, #MDREFR_OFFSET]
@ clear the DRI field
@
bic r4, r4, r2
@ insert the valid DRI field loaded above
@
orr r4, r4, r3
@ write back mdrefr
@
str r4, [r1, #MDREFR_OFFSET]
@ *Note: preserve the mdrefr value in r4 *
/*SET_LED 4 */
@****************************************************************************
@ Step 3
@
@ NO SRAM
mov pc, r10
@****************************************************************************
@ Step 4
@
@ Assumes previous mdrefr value in r4, if not then read current mdrefr
@ clear the free-running clock bits
@ (clear K0Free, K1Free, K2Free
@
bic r4, r4, #(0x00800000 | 0x01000000 | 0x02000000)
@ set K0RUN for CPLD clock
@
orr r4, r4, #0x00002000
@ set K1RUN if bank 0 installed
@
orr r4, r4, #0x00010000
@ write back mdrefr
@
str r4, [r1, #MDREFR_OFFSET]
ldr r4, [r1, #MDREFR_OFFSET]
@ deassert SLFRSH
@
bic r4, r4, #0x00400000
@ write back mdrefr
@
str r4, [r1, #MDREFR_OFFSET]
@ assert E1PIN
@
orr r4, r4, #0x00008000
@ write back mdrefr
@
str r4, [r1, #MDREFR_OFFSET]
ldr r4, [r1, #MDREFR_OFFSET]
nop
nop
#else
@ Step 2d
@ get the mdrefr settings
ldr r4, =CONFIG_SYS_MDREFR_VAL
@ write back mdrefr
@
str r4, [r1, #MDREFR_OFFSET]
@ Step 4
@ set K0RUN for FLASH clock
@
orr r4, r4, #0x00002000
@ set K1RUN for bank DRAM 0
@
orr r4, r4, #0x00010000
@ set K2RUN for bank PLD
@
orr r4, r4, #0x00040000
@ write back mdrefr
@
str r4, [r1, #MDREFR_OFFSET]
ldr r4, [r1, #MDREFR_OFFSET]
@ deassert SLFRSH
@
bic r4, r4, #0x00400000
@ write back mdrefr
@
str r4, [r1, #MDREFR_OFFSET]
@ assert E1PIN
@
orr r4, r4, #0x00008000
@ write back mdrefr
@
str r4, [r1, #MDREFR_OFFSET]
ldr r4, [r1, #MDREFR_OFFSET]
nop
nop
#endif
@ Step 4d
@ fetch platform value of mdcnfg
@
ldr r2, =CONFIG_SYS_MDCNFG_VAL
@ disable all sdram banks
@
bic r2, r2, #(MDCNFG_DE0 | MDCNFG_DE1)
bic r2, r2, #(MDCNFG_DE2 | MDCNFG_DE3)
@ program banks 0/1 for bus width
@
bic r2, r2, #MDCNFG_DWID0 @0=32-bit
@ write initial value of mdcnfg, w/o enabling sdram banks
@
str r2, [r1, #MDCNFG_OFFSET]
@ Step 4e
@ pause for 200 uSecs
@
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
/*SET_LED 5 */
/* Why is this here??? */
mov r0, #0x78 @turn everything off
mcr p15, 0, r0, c1, c0, 0 @(caches off, MMU off, etc.)
@ Step 4f
@ Access memory *not yet enabled* for CBR refresh cycles (8)
@ - CBR is generated for all banks
ldr r2, =CONFIG_SYS_DRAM_BASE
str r2, [r2]
str r2, [r2]
str r2, [r2]
str r2, [r2]
str r2, [r2]
str r2, [r2]
str r2, [r2]
str r2, [r2]
@ Step 4g
@get memory controller base address
@
ldr r1, =MEMC_BASE
@fetch current mdcnfg value
@
ldr r3, [r1, #MDCNFG_OFFSET]
@enable sdram bank 0 if installed (must do for any populated bank)
@
orr r3, r3, #MDCNFG_DE0
@write back mdcnfg, enabling the sdram bank(s)
@
str r3, [r1, #MDCNFG_OFFSET]
@ Step 4h
@ write mdmrs
@
ldr r2, =CONFIG_SYS_MDMRS_VAL
str r2, [r1, #MDMRS_OFFSET]
@ Done Memory Init
/*SET_LED 6 */
@********************************************************************
@ Disable (mask) all interrupts at the interrupt controller
@
@ clear the interrupt level register (use IRQ, not FIQ)
@
mov r1, #0
ldr r2, =ICLR
str r1, [r2]
@ Set interrupt mask register
@
ldr r1, =CONFIG_SYS_ICMR_VAL
ldr r2, =ICMR
str r1, [r2]
@ ********************************************************************
@ Disable the peripheral clocks, and set the core clock
@
@ Turn Off ALL on-chip peripheral clocks for re-configuration
@
ldr r1, =CKEN
mov r2, #0
str r2, [r1]
@ set core clocks
@
ldr r2, =CONFIG_SYS_CCCR_VAL
ldr r1, =CCCR
str r2, [r1]
#ifdef ENABLE32KHZ
@ enable the 32Khz oscillator for RTC and PowerManager
@
ldr r1, =OSCC
mov r2, #OSCC_OON
str r2, [r1]
@ NOTE: spin here until OSCC.OOK get set,
@ meaning the PLL has settled.
@
60:
ldr r2, [r1]
ands r2, r2, #1
beq 60b
#endif
@ Turn on needed clocks
@
ldr r1, =CKEN
ldr r2, =CONFIG_SYS_CKEN_VAL
str r2, [r1]
/*SET_LED 7 */
/* Is this needed???? */
#define NODEBUG
#ifdef NODEBUG
/*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 */
#endif
/*SET_LED 8 */
mov pc, r10
@ End lowlevel_init
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