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489 lines
9.1 KiB
ArmAsm
489 lines
9.1 KiB
ArmAsm
/*
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* Most of this taken from Redboot hal_platform_setup.h with cleanup
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*
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* See file CREDITS for list of people who contributed to this
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* project.
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License as
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* published by the Free Software Foundation; either version 2 of
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* the License, or (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston,
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* MA 02111-1307 USA
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*/
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#include <config.h>
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#include <version.h>
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#include <asm/arch/pxa-regs.h>
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DRAM_SIZE: .long CONFIG_SYS_DRAM_SIZE
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/* wait for coprocessor write complete */
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.macro CPWAIT reg
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mrc p15,0,\reg,c2,c0,0
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mov \reg,\reg
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sub pc,pc,#4
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.endm
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.globl lowlevel_init
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lowlevel_init:
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mov r10, lr
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/* Set up GPIO pins first */
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ldr r0, =GPSR0
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ldr r1, =CONFIG_SYS_GPSR0_VAL
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str r1, [r0]
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ldr r0, =GPSR1
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ldr r1, =CONFIG_SYS_GPSR1_VAL
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str r1, [r0]
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ldr r0, =GPSR2
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ldr r1, =CONFIG_SYS_GPSR2_VAL
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str r1, [r0]
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ldr r0, =GPCR0
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ldr r1, =CONFIG_SYS_GPCR0_VAL
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str r1, [r0]
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ldr r0, =GPCR1
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ldr r1, =CONFIG_SYS_GPCR1_VAL
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str r1, [r0]
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ldr r0, =GPCR2
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ldr r1, =CONFIG_SYS_GPCR2_VAL
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str r1, [r0]
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ldr r0, =GRER0
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ldr r1, =CONFIG_SYS_GRER0_VAL
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str r1, [r0]
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ldr r0, =GRER1
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ldr r1, =CONFIG_SYS_GRER1_VAL
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str r1, [r0]
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ldr r0, =GRER2
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ldr r1, =CONFIG_SYS_GRER2_VAL
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str r1, [r0]
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ldr r0, =GFER0
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ldr r1, =CONFIG_SYS_GFER0_VAL
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str r1, [r0]
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ldr r0, =GFER1
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ldr r1, =CONFIG_SYS_GFER1_VAL
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str r1, [r0]
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ldr r0, =GFER2
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ldr r1, =CONFIG_SYS_GFER2_VAL
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str r1, [r0]
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ldr r0, =GPDR0
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ldr r1, =CONFIG_SYS_GPDR0_VAL
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str r1, [r0]
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ldr r0, =GPDR1
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ldr r1, =CONFIG_SYS_GPDR1_VAL
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str r1, [r0]
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ldr r0, =GPDR2
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ldr r1, =CONFIG_SYS_GPDR2_VAL
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str r1, [r0]
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ldr r0, =GAFR0_L
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ldr r1, =CONFIG_SYS_GAFR0_L_VAL
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str r1, [r0]
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ldr r0, =GAFR0_U
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ldr r1, =CONFIG_SYS_GAFR0_U_VAL
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str r1, [r0]
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ldr r0, =GAFR1_L
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ldr r1, =CONFIG_SYS_GAFR1_L_VAL
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str r1, [r0]
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ldr r0, =GAFR1_U
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ldr r1, =CONFIG_SYS_GAFR1_U_VAL
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str r1, [r0]
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ldr r0, =GAFR2_L
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ldr r1, =CONFIG_SYS_GAFR2_L_VAL
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str r1, [r0]
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ldr r0, =GAFR2_U
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ldr r1, =CONFIG_SYS_GAFR2_U_VAL
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str r1, [r0]
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/* enable GPIO pins */
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ldr r0, =PSSR
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ldr r1, =CONFIG_SYS_PSSR_VAL
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str r1, [r0]
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/*********************************************************************
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Initlialize Memory Controller
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See PXA250 Operating System Developer's Guide
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pause for 200 uSecs- allow internal clocks to settle
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*Note: only need this if hard reset... doing it anyway for now
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*/
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@ Step 1
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@ ---- Wait 200 usec
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ldr r3, =OSCR @ reset the OS Timer Count to zero
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mov r2, #0
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str r2, [r3]
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ldr r4, =0x300 @ really 0x2E1 is about 200usec, so 0x300 should be plenty
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1:
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ldr r2, [r3]
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cmp r4, r2
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bgt 1b
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mem_init:
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@ get memory controller base address
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ldr r1, =MEMC_BASE
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@****************************************************************************
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@ Step 2
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@
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@ Step 2a
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@ write msc0, read back to ensure data latches
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@
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ldr r2, =CONFIG_SYS_MSC0_VAL
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str r2, [r1, #MSC0_OFFSET]
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ldr r2, [r1, #MSC0_OFFSET]
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@ write msc1
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ldr r2, =CONFIG_SYS_MSC1_VAL
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str r2, [r1, #MSC1_OFFSET]
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ldr r2, [r1, #MSC1_OFFSET]
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@ write msc2
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ldr r2, =CONFIG_SYS_MSC2_VAL
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str r2, [r1, #MSC2_OFFSET]
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ldr r2, [r1, #MSC2_OFFSET]
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@ Step 2b
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@ write mecr
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ldr r2, =CONFIG_SYS_MECR_VAL
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str r2, [r1, #MECR_OFFSET]
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@ write mcmem0
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ldr r2, =CONFIG_SYS_MCMEM0_VAL
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str r2, [r1, #MCMEM0_OFFSET]
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@ write mcmem1
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ldr r2, =CONFIG_SYS_MCMEM1_VAL
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str r2, [r1, #MCMEM1_OFFSET]
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@ write mcatt0
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ldr r2, =CONFIG_SYS_MCATT0_VAL
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str r2, [r1, #MCATT0_OFFSET]
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@ write mcatt1
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ldr r2, =CONFIG_SYS_MCATT1_VAL
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str r2, [r1, #MCATT1_OFFSET]
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@ write mcio0
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ldr r2, =CONFIG_SYS_MCIO0_VAL
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str r2, [r1, #MCIO0_OFFSET]
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@ write mcio1
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ldr r2, =CONFIG_SYS_MCIO1_VAL
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str r2, [r1, #MCIO1_OFFSET]
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@ Step 2c
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@ fly-by-dma is defeatured on this part
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@ write flycnfg
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@ldr r2, =CONFIG_SYS_FLYCNFG_VAL
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@str r2, [r1, #FLYCNFG_OFFSET]
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/* FIXME Does this sequence really make sense */
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#ifdef REDBOOT_WAY
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@ Step 2d
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@ get the mdrefr settings
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ldr r3, =CONFIG_SYS_MDREFR_VAL
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@ extract DRI field (we need a valid DRI field)
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@
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ldr r2, =0xFFF
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@ valid DRI field in r3
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@
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and r3, r3, r2
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@ get the reset state of MDREFR
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@
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ldr r4, [r1, #MDREFR_OFFSET]
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@ clear the DRI field
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@
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bic r4, r4, r2
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@ insert the valid DRI field loaded above
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@
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orr r4, r4, r3
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@ write back mdrefr
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@
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str r4, [r1, #MDREFR_OFFSET]
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@ *Note: preserve the mdrefr value in r4 *
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@****************************************************************************
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@ Step 3
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@
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@ NO SRAM
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mov pc, r10
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@****************************************************************************
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@ Step 4
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@
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@ Assumes previous mdrefr value in r4, if not then read current mdrefr
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@ clear the free-running clock bits
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@ (clear K0Free, K1Free, K2Free
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@
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bic r4, r4, #(0x00800000 | 0x01000000 | 0x02000000)
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@ set K0RUN for CPLD clock
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@
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orr r4, r4, #0x00002000
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@ set K1RUN if bank 0 installed
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@
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orr r4, r4, #0x00010000
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@ write back mdrefr
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@
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str r4, [r1, #MDREFR_OFFSET]
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ldr r4, [r1, #MDREFR_OFFSET]
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@ deassert SLFRSH
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@
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bic r4, r4, #0x00400000
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@ write back mdrefr
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@
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str r4, [r1, #MDREFR_OFFSET]
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@ assert E1PIN
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@
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orr r4, r4, #0x00008000
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@ write back mdrefr
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@
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str r4, [r1, #MDREFR_OFFSET]
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ldr r4, [r1, #MDREFR_OFFSET]
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nop
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nop
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#else
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@ Step 2d
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@ get the mdrefr settings
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ldr r3, =CONFIG_SYS_MDREFR_VAL
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@ write back mdrefr
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@
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str r4, [r1, #MDREFR_OFFSET]
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@ Step 4
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@ set K0RUN for CPLD clock
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@
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orr r4, r4, #0x00002000
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@ set K1RUN for bank 0
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@
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orr r4, r4, #0x00010000
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@ write back mdrefr
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@
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str r4, [r1, #MDREFR_OFFSET]
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ldr r4, [r1, #MDREFR_OFFSET]
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@ deassert SLFRSH
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@
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bic r4, r4, #0x00400000
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@ write back mdrefr
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@
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str r4, [r1, #MDREFR_OFFSET]
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@ assert E1PIN
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@
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orr r4, r4, #0x00008000
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@ write back mdrefr
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@
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str r4, [r1, #MDREFR_OFFSET]
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ldr r4, [r1, #MDREFR_OFFSET]
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nop
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nop
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#endif
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@ Step 4d
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@ fetch platform value of mdcnfg
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@
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ldr r2, =CONFIG_SYS_MDCNFG_VAL
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@ disable all sdram banks
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@
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bic r2, r2, #(MDCNFG_DE0 | MDCNFG_DE1)
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bic r2, r2, #(MDCNFG_DE2 | MDCNFG_DE3)
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@ program banks 0/1 for bus width
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@
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bic r2, r2, #MDCNFG_DWID0 @0=32-bit
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@ write initial value of mdcnfg, w/o enabling sdram banks
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@
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str r2, [r1, #MDCNFG_OFFSET]
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@ Step 4e
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@ pause for 200 uSecs
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@
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ldr r3, =OSCR @ reset the OS Timer Count to zero
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mov r2, #0
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str r2, [r3]
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ldr r4, =0x300 @ really 0x2E1 is about 200usec, so 0x300 should be plenty
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1:
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ldr r2, [r3]
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cmp r4, r2
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bgt 1b
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/* Why is this here??? */
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mov r0, #0x78 @turn everything off
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mcr p15, 0, r0, c1, c0, 0 @(caches off, MMU off, etc.)
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@ Step 4f
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@ Access memory *not yet enabled* for CBR refresh cycles (8)
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@ - CBR is generated for all banks
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ldr r2, =CONFIG_SYS_DRAM_BASE
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str r2, [r2]
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str r2, [r2]
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str r2, [r2]
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str r2, [r2]
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str r2, [r2]
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str r2, [r2]
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str r2, [r2]
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str r2, [r2]
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@ Step 4g
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@get memory controller base address
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@
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ldr r1, =MEMC_BASE
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@fetch current mdcnfg value
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@
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ldr r3, [r1, #MDCNFG_OFFSET]
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@enable sdram bank 0 if installed (must do for any populated bank)
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@
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orr r3, r3, #MDCNFG_DE0
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@write back mdcnfg, enabling the sdram bank(s)
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@
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str r3, [r1, #MDCNFG_OFFSET]
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@ Step 4h
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@ write mdmrs
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@
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ldr r2, =CONFIG_SYS_MDMRS_VAL
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str r2, [r1, #MDMRS_OFFSET]
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@ Done Memory Init
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/*SET_LED 6 */
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@********************************************************************
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@ Disable (mask) all interrupts at the interrupt controller
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@
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@ clear the interrupt level register (use IRQ, not FIQ)
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@
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mov r1, #0
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ldr r2, =ICLR
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str r1, [r2]
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@ Set interrupt mask register
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@
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ldr r1, =CONFIG_SYS_ICMR_VAL
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ldr r2, =ICMR
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str r1, [r2]
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@ ********************************************************************
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@ Disable the peripheral clocks, and set the core clock
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@
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@ Turn Off ALL on-chip peripheral clocks for re-configuration
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@
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ldr r1, =CKEN
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mov r2, #0
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str r2, [r1]
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@ set core clocks
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@
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ldr r2, =CONFIG_SYS_CCCR_VAL
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ldr r1, =CCCR
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str r2, [r1]
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#ifdef ENABLE32KHZ
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@ enable the 32Khz oscillator for RTC and PowerManager
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@
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ldr r1, =OSCC
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mov r2, #OSCC_OON
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str r2, [r1]
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@ NOTE: spin here until OSCC.OOK get set,
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@ meaning the PLL has settled.
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@
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60:
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ldr r2, [r1]
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ands r2, r2, #1
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beq 60b
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#endif
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@ Turn on needed clocks
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@
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ldr r1, =CKEN
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ldr r2, =CONFIG_SYS_CKEN_VAL
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str r2, [r1]
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/*SET_LED 7 */
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/* Is this needed???? */
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#define NODEBUG
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#ifdef NODEBUG
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/*Disable software and data breakpoints */
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mov r0,#0
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mcr p15,0,r0,c14,c8,0 /* ibcr0 */
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mcr p15,0,r0,c14,c9,0 /* ibcr1 */
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mcr p15,0,r0,c14,c4,0 /* dbcon */
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/*Enable all debug functionality */
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mov r0,#0x80000000
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mcr p14,0,r0,c10,c0,0 /* dcsr */
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#endif
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mov pc, r10
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@ End lowlevel_init
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