mirror of
https://github.com/AsahiLinux/u-boot
synced 2024-11-18 18:59:44 +00:00
503 lines
13 KiB
ArmAsm
503 lines
13 KiB
ArmAsm
/*
|
||
* This was originally from the Lubbock u-boot port.
|
||
*
|
||
* 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>
|
||
|
||
/* 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 ----------------------------------------- */
|
||
|
||
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, =GPSR3
|
||
ldr r1, =CONFIG_SYS_GPSR3_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, =GPCR3
|
||
ldr r1, =CONFIG_SYS_GPCR3_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, =GRER3
|
||
ldr r1, =CONFIG_SYS_GRER3_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, =GFER3
|
||
ldr r1, =CONFIG_SYS_GFER3_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, =GPDR3
|
||
ldr r1, =CONFIG_SYS_GPDR3_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]
|
||
|
||
ldr r0, =GAFR3_L
|
||
ldr r1, =CONFIG_SYS_GAFR3_L_VAL
|
||
str r1, [r0]
|
||
|
||
ldr r0, =GAFR3_U
|
||
ldr r1, =CONFIG_SYS_GAFR3_U_VAL
|
||
str r1, [r0]
|
||
|
||
ldr r0, =PSSR /* enable GPIO pins */
|
||
ldr r1, =CONFIG_SYS_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, =CONFIG_SYS_MSC0_VAL
|
||
str r2, [r1, #MSC0_OFFSET]
|
||
ldr r2, [r1, #MSC0_OFFSET] /* read back to ensure */
|
||
/* that data latches */
|
||
/* MSC1: nCS(2,3) */
|
||
ldr r2, =CONFIG_SYS_MSC1_VAL
|
||
str r2, [r1, #MSC1_OFFSET]
|
||
ldr r2, [r1, #MSC1_OFFSET]
|
||
|
||
/* MSC2: nCS(4,5) */
|
||
ldr r2, =CONFIG_SYS_MSC2_VAL
|
||
str r2, [r1, #MSC2_OFFSET]
|
||
ldr r2, [r1, #MSC2_OFFSET]
|
||
|
||
/* ---------------------------------------------------------------- */
|
||
/* Step 2b: Initialize Card Interface */
|
||
/* ---------------------------------------------------------------- */
|
||
|
||
/* MECR: Memory Expansion Card Register */
|
||
ldr r2, =CONFIG_SYS_MECR_VAL
|
||
str r2, [r1, #MECR_OFFSET]
|
||
ldr r2, [r1, #MECR_OFFSET]
|
||
|
||
/* MCMEM0: Card Interface slot 0 timing */
|
||
ldr r2, =CONFIG_SYS_MCMEM0_VAL
|
||
str r2, [r1, #MCMEM0_OFFSET]
|
||
ldr r2, [r1, #MCMEM0_OFFSET]
|
||
|
||
/* MCMEM1: Card Interface slot 1 timing */
|
||
ldr r2, =CONFIG_SYS_MCMEM1_VAL
|
||
str r2, [r1, #MCMEM1_OFFSET]
|
||
ldr r2, [r1, #MCMEM1_OFFSET]
|
||
|
||
/* MCATT0: Card Interface Attribute Space Timing, slot 0 */
|
||
ldr r2, =CONFIG_SYS_MCATT0_VAL
|
||
str r2, [r1, #MCATT0_OFFSET]
|
||
ldr r2, [r1, #MCATT0_OFFSET]
|
||
|
||
/* MCATT1: Card Interface Attribute Space Timing, slot 1 */
|
||
ldr r2, =CONFIG_SYS_MCATT1_VAL
|
||
str r2, [r1, #MCATT1_OFFSET]
|
||
ldr r2, [r1, #MCATT1_OFFSET]
|
||
|
||
/* MCIO0: Card Interface I/O Space Timing, slot 0 */
|
||
ldr r2, =CONFIG_SYS_MCIO0_VAL
|
||
str r2, [r1, #MCIO0_OFFSET]
|
||
ldr r2, [r1, #MCIO0_OFFSET]
|
||
|
||
/* MCIO1: Card Interface I/O Space Timing, slot 1 */
|
||
ldr r2, =CONFIG_SYS_MCIO1_VAL
|
||
str r2, [r1, #MCIO1_OFFSET]
|
||
ldr r2, [r1, #MCIO1_OFFSET]
|
||
|
||
/* ---------------------------------------------------------------- */
|
||
/* Step 2c: Write FLYCNFG FIXME: what's that??? */
|
||
/* ---------------------------------------------------------------- */
|
||
ldr r2, =CONFIG_SYS_FLYCNFG_VAL
|
||
str r2, [r1, #FLYCNFG_OFFSET]
|
||
str r2, [r1, #FLYCNFG_OFFSET]
|
||
|
||
/* ---------------------------------------------------------------- */
|
||
/* Step 2d: Initialize Timing for Sync Memory (SDCLK0) */
|
||
/* ---------------------------------------------------------------- */
|
||
|
||
/* Before accessing MDREFR we need a valid DRI field, so we set */
|
||
/* this to power on defaults + DRI field. */
|
||
|
||
ldr r4, [r1, #MDREFR_OFFSET]
|
||
ldr r2, =0xFFF
|
||
bic r4, r4, r2
|
||
|
||
ldr r3, =CONFIG_SYS_MDREFR_VAL
|
||
and r3, r3, r2
|
||
|
||
orr r4, r4, r3
|
||
str r4, [r1, #MDREFR_OFFSET] /* write back MDREFR */
|
||
|
||
orr r4, r4, #MDREFR_K0RUN
|
||
orr r4, r4, #MDREFR_K0DB4
|
||
orr r4, r4, #MDREFR_K0FREE
|
||
orr r4, r4, #MDREFR_K0DB2
|
||
orr r4, r4, #MDREFR_K1DB2
|
||
bic r4, r4, #MDREFR_K1FREE
|
||
bic r4, r4, #MDREFR_K2FREE
|
||
|
||
str r4, [r1, #MDREFR_OFFSET] /* write back MDREFR */
|
||
ldr r4, [r1, #MDREFR_OFFSET]
|
||
|
||
/* Note: preserve the mdrefr value in r4 */
|
||
|
||
|
||
/* ---------------------------------------------------------------- */
|
||
/* 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. */
|
||
|
||
ldr r2, =CONFIG_SYS_SXCNFG_VAL
|
||
str r2, [r1, #SXCNFG_OFFSET]
|
||
|
||
/* ---------------------------------------------------------------- */
|
||
/* Step 4: Initialize SDRAM */
|
||
/* ---------------------------------------------------------------- */
|
||
|
||
bic r4, r4, #(MDREFR_K2FREE |MDREFR_K1FREE | MDREFR_K0FREE)
|
||
|
||
orr r4, r4, #MDREFR_K1RUN
|
||
bic r4, r4, #MDREFR_K2DB2
|
||
str r4, [r1, #MDREFR_OFFSET]
|
||
ldr r4, [r1, #MDREFR_OFFSET]
|
||
|
||
bic r4, r4, #MDREFR_SLFRSH
|
||
str r4, [r1, #MDREFR_OFFSET]
|
||
ldr r4, [r1, #MDREFR_OFFSET]
|
||
|
||
orr r4, r4, #MDREFR_E1PIN
|
||
str r4, [r1, #MDREFR_OFFSET]
|
||
ldr r4, [r1, #MDREFR_OFFSET]
|
||
|
||
nop
|
||
nop
|
||
|
||
|
||
/* Step 4d: write MDCNFG with MDCNFG:DEx deasserted (set to 0), to */
|
||
/* configure but not enable each SDRAM partition pair. */
|
||
|
||
ldr r4, =CONFIG_SYS_MDCNFG_VAL
|
||
bic r4, r4, #(MDCNFG_DE0|MDCNFG_DE1)
|
||
bic r4, r4, #(MDCNFG_DE2|MDCNFG_DE3)
|
||
|
||
str r4, [r1, #MDCNFG_OFFSET] /* write back MDCNFG */
|
||
ldr r4, [r1, #MDCNFG_OFFSET]
|
||
|
||
|
||
/* Step 4e: Wait for the clock to the SDRAMs to stabilize, */
|
||
/* 100..200 <20>sec. */
|
||
|
||
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, =CONFIG_SYS_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]
|
||
|
||
|
||
/* Step 4g: Write MDCNFG with enable bits asserted */
|
||
/* (MDCNFG:DEx set to 1). */
|
||
|
||
ldr r3, [r1, #MDCNFG_OFFSET]
|
||
mov r4, r3
|
||
orr r3, r3, #MDCNFG_DE0
|
||
str r3, [r1, #MDCNFG_OFFSET]
|
||
mov r0, r3
|
||
|
||
/* Step 4h: Write MDMRS. */
|
||
|
||
ldr r2, =CONFIG_SYS_MDMRS_VAL
|
||
str r2, [r1, #MDMRS_OFFSET]
|
||
|
||
/* enable APD */
|
||
ldr r3, [r1, #MDREFR_OFFSET]
|
||
orr r3, r3, #MDREFR_APD
|
||
str r3, [r1, #MDREFR_OFFSET]
|
||
|
||
/* We are finished with Intel's memory controller initialisation */
|
||
|
||
|
||
setvoltage:
|
||
|
||
mov r10, lr
|
||
bl initPXAvoltage /* In case the board is rebooting with a */
|
||
mov lr, r10 /* low voltage raise it up to a good one. */
|
||
|
||
#if 1
|
||
b initirqs
|
||
#endif
|
||
|
||
wakeup:
|
||
/* Are we waking from sleep? */
|
||
ldr r0, =RCSR
|
||
ldr r1, [r0]
|
||
and r1, r1, #(RCSR_GPR | RCSR_SMR | RCSR_WDR | RCSR_HWR)
|
||
str r1, [r0]
|
||
teq r1, #RCSR_SMR
|
||
|
||
bne initirqs
|
||
|
||
ldr r0, =PSSR
|
||
mov r1, #PSSR_PH
|
||
str r1, [r0]
|
||
|
||
/* if so, resume at PSPR */
|
||
ldr r0, =PSPR
|
||
ldr r1, [r0]
|
||
mov pc, r1
|
||
|
||
/* ---------------------------------------------------------------- */
|
||
/* 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 r2, =ICMR /* mask all interrupts at the controller */
|
||
str r1, [r2]
|
||
|
||
/* ---------------------------------------------------------------- */
|
||
/* Clock initialisation */
|
||
/* ---------------------------------------------------------------- */
|
||
|
||
initclks:
|
||
|
||
/* Disable the peripheral clocks, and set the core clock frequency */
|
||
|
||
/* Turn Off on-chip peripheral clocks (except for memory) */
|
||
/* for re-configuration. */
|
||
ldr r1, =CKEN
|
||
ldr r2, =CONFIG_SYS_CKEN
|
||
str r2, [r1]
|
||
|
||
/* ... and write the core clock config register */
|
||
ldr r2, =CONFIG_SYS_CCCR
|
||
ldr r1, =CCCR
|
||
str r2, [r1]
|
||
|
||
/* Turn on turbo mode */
|
||
mrc p14, 0, r2, c6, c0, 0
|
||
orr r2, r2, #0xB /* Turbo, Fast-Bus, Freq change**/
|
||
mcr p14, 0, r2, c6, c0, 0
|
||
|
||
/* Re-write MDREFR */
|
||
ldr r1, =MEMC_BASE
|
||
ldr r2, [r1, #MDREFR_OFFSET]
|
||
str r2, [r1, #MDREFR_OFFSET]
|
||
#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
|
||
#else
|
||
#error "RTC not defined"
|
||
#endif
|
||
|
||
/* Interrupt init: Mask all interrupts */
|
||
ldr r0, =ICMR /* enable no sources */
|
||
mov r1, #0
|
||
str r1, [r0]
|
||
/* FIXME */
|
||
|
||
#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
|