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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
.globl lowlevel_init
lowlevel_init:
mov r10, lr
/* Set up GPIO pins first ----------------------------------------- */
ldr r0,=GPSR0
ldr r1,=CFG_GPSR0_VAL
str r1,[r0]
ldr r0,=GPSR1
ldr r1,=CFG_GPSR1_VAL
str r1,[r0]
ldr r0,=GPSR2
ldr r1,=CFG_GPSR2_VAL
str r1,[r0]
ldr r0,=GPCR0
ldr r1,=CFG_GPCR0_VAL
str r1,[r0]
ldr r0,=GPCR1
ldr r1,=CFG_GPCR1_VAL
str r1,[r0]
ldr r0,=GPCR2
ldr r1,=CFG_GPCR2_VAL
str r1,[r0]
ldr r0,=GPDR0
ldr r1,=CFG_GPDR0_VAL
str r1,[r0]
ldr r0,=GPDR1
ldr r1,=CFG_GPDR1_VAL
str r1,[r0]
ldr r0,=GPDR2
ldr r1,=CFG_GPDR2_VAL
str r1,[r0]
ldr r0,=GAFR0_L
ldr r1,=CFG_GAFR0_L_VAL
str r1,[r0]
ldr r0,=GAFR0_U
ldr r1,=CFG_GAFR0_U_VAL
str r1,[r0]
ldr r0,=GAFR1_L
ldr r1,=CFG_GAFR1_L_VAL
str r1,[r0]
ldr r0,=GAFR1_U
ldr r1,=CFG_GAFR1_U_VAL
str r1,[r0]
ldr r0,=GAFR2_L
ldr r1,=CFG_GAFR2_L_VAL
str r1,[r0]
ldr r0,=GAFR2_U
ldr r1,=CFG_GAFR2_U_VAL
str r1,[r0]
ldr r0,=PSSR /* enable GPIO pins */
ldr r1,=CFG_PSSR_VAL
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:
ldr r1,=MEMC_BASE /* get memory controller base addr. */
/* ---------------------------------------------------------------- */
/* Step 2a: Initialize Asynchronous static memory controller */
/* ---------------------------------------------------------------- */
/* MSC registers: timing, bus width, mem type */
/* MSC0: nCS(0,1) */
ldr r2,=CFG_MSC0_VAL
str r2,[r1, #MSC0_OFFSET]
ldr r2,[r1, #MSC0_OFFSET] /* read back to ensure data latches */
/* MSC1: nCS(2,3) */
ldr r2,=CFG_MSC1_VAL
str r2,[r1, #MSC1_OFFSET]
ldr r2,[r1, #MSC1_OFFSET]
/* MSC2: nCS(4,5) */
ldr r2,=CFG_MSC2_VAL
str r2,[r1, #MSC2_OFFSET]
ldr r2,[r1, #MSC2_OFFSET]
/* ---------------------------------------------------------------- */
/* Step 2b: Initialize Card Interface */
/* ---------------------------------------------------------------- */
/* MECR: Memory Expansion Card Register */
ldr r2,=CFG_MECR_VAL
str r2,[r1, #MECR_OFFSET]
ldr r2,[r1, #MECR_OFFSET]
/* MCMEM0: Card Interface slot 0 timing */
ldr r2,=CFG_MCMEM0_VAL
str r2,[r1, #MCMEM0_OFFSET]
ldr r2,[r1, #MCMEM0_OFFSET]
/* MCMEM1: Card Interface slot 1 timing */
ldr r2,=CFG_MCMEM1_VAL
str r2,[r1, #MCMEM1_OFFSET]
ldr r2,[r1, #MCMEM1_OFFSET]
/* MCATT0: Card Interface Attribute Space Timing, slot 0 */
ldr r2,=CFG_MCATT0_VAL
str r2,[r1, #MCATT0_OFFSET]
ldr r2,[r1, #MCATT0_OFFSET]
/* MCATT1: Card Interface Attribute Space Timing, slot 1 */
ldr r2,=CFG_MCATT1_VAL
str r2,[r1, #MCATT1_OFFSET]
ldr r2,[r1, #MCATT1_OFFSET]
/* MCIO0: Card Interface I/O Space Timing, slot 0 */
ldr r2,=CFG_MCIO0_VAL
str r2,[r1, #MCIO0_OFFSET]
ldr r2,[r1, #MCIO0_OFFSET]
/* MCIO1: Card Interface I/O Space Timing, slot 1 */
ldr r2,=CFG_MCIO1_VAL
str r2,[r1, #MCIO1_OFFSET]
ldr r2,[r1, #MCIO1_OFFSET]
/* ---------------------------------------------------------------- */
/* Step 2c: Write FLYCNFG FIXME: what's that??? */
/* ---------------------------------------------------------------- */
/* ---------------------------------------------------------------- */
/* Step 2d: Initialize Timing for Sync Memory (SDCLK0) */
/* ---------------------------------------------------------------- */
@ get the mdrefr settings
ldr r4,=CFG_MDREFR_VAL
@ write back mdrefr
str r4,[r1, #MDREFR_OFFSET]
ldr r4,[r1, #MDREFR_OFFSET]
/* ---------------------------------------------------------------- */
/* Step 3: Initialize Synchronous Static Memory (Flash/Peripherals) */
/* ---------------------------------------------------------------- */
/* Initialize SXCNFG register. Assert the enable bits */
/* Write SXMRS to cause an MRS command to all enabled banks of */
/* synchronous static memory. Note that SXLCR need not be written */
/* at this time. */
/* FIXME: we use async mode for now */
/* ---------------------------------------------------------------- */
/* Step 4: Initialize SDRAM */
/* ---------------------------------------------------------------- */
@ set K1RUN for bank 0
@
orr r4, r4, #MDREFR_K1RUN
@ write back mdrefr
@
str r4, [r1, #MDREFR_OFFSET]
ldr r4, [r1, #MDREFR_OFFSET]
@ deassert SLFRSH
@
bic r4, r4, #MDREFR_SLFRSH
@ write back mdrefr
@
str r4, [r1, #MDREFR_OFFSET]
ldr r4, [r1, #MDREFR_OFFSET]
@ assert E1PIN
@ if E0PIN is also used: #(MDREFR_E1PIN|MDREFR_E0PIN)
orr r4, r4, #(MDREFR_E1PIN)
@ write back mdrefr
@
str r4, [r1, #MDREFR_OFFSET]
ldr r4, [r1, #MDREFR_OFFSET]
nop
nop
/* Step 4d: */
/* fetch platform value of mdcnfg */
@
ldr r2, =CFG_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: Wait for the clock to the SDRAMs to stabilize, */
/* 100..200 µsec. */
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
/* Step 4f: Trigger a number (usually 8) refresh cycles by */
/* attempting non-burst read or write accesses to disabled */
/* SDRAM, as commonly specified in the power up sequence */
/* documented in SDRAM data sheets. The address(es) used */
/* for this purpose must not be cacheable. */
ldr r3, =CFG_DRAM_BASE
str r2, [r3]
str r2, [r3]
str r2, [r3]
str r2, [r3]
str r2, [r3]
str r2, [r3]
str r2, [r3]
str r2, [r3]
str r2, [r3]
/* Step 4g: Write MDCNFG with enable bits asserted */
/* 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, =CFG_MDMRS_VAL
str r2, [r1, #MDMRS_OFFSET]
/* We are finished with Intel's memory controller initialisation */
/* ---------------------------------------------------------------- */
/* Disable (mask) all interrupts at interrupt controller */
/* ---------------------------------------------------------------- */
initirqs:
mov r1, #0 /* clear int. level register (IRQ, not FIQ) */
ldr r2, =ICLR
str r1, [r2]
ldr r1, =CFG_ICMR_VAL /* mask all interrupts at the controller */
ldr r2, =ICMR
str r1, [r2]
/* ---------------------------------------------------------------- */
/* Clock initialisation */
/* ---------------------------------------------------------------- */
initclks:
/* Disable the peripheral clocks, and set the core clock frequency */
/* (hard-coding at 398.12MHz for now). */
/* Turn Off ALL on-chip peripheral clocks for re-configuration */
/* Note: See label 'ENABLECLKS' for the re-enabling */
ldr r1, =CKEN
mov r2, #0
str r2, [r1]
/* default value */
ldr r2, =(CCCR_L27|CCCR_M2|CCCR_N10) /* DEFAULT: {200/200/100} */
/* ... and write the core clock config register */
ldr r1, =CCCR
str r2, [r1]
#ifdef RTC
/* 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
@
test:
ldr r1, =CKEN
ldr r2, =CFG_CKEN_VAL
str r2, [r1]
/* ---------------------------------------------------------------- */
/* */
/* ---------------------------------------------------------------- */
/* Save SDRAM size ?*/
ldr r1, =DRAM_SIZE
str r8, [r1]
/* FIXME */
#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
/* ---------------------------------------------------------------- */
/* End lowlevel_init */
/* ---------------------------------------------------------------- */
endlowlevel_init:
mov pc, lr
|
