438 lines
13 KiB
ArmAsm
438 lines
13 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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* NOTE: I haven't clean this up considerably, just enough to get it
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* running. See hal_platform_setup.h for the source. See
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* board/cradle/lowlevel_init.S for another PXA250 setup that is
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* much cleaner.
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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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_TEXT_BASE:
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.word TEXT_BASE
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/*
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* Memory setup
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*/
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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, =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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ldr r0, =PSSR /* enable GPIO pins */
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ldr r1, =CONFIG_SYS_PSSR_VAL
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str r1, [r0]
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/* ldr r3, =MSC1 / low - bank 2 Lubbock Registers / SRAM */
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/* ldr r2, =CONFIG_SYS_MSC1_VAL / high - bank 3 Ethernet Controller */
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/* str r2, [r3] / need to set MSC1 before trying to write to the HEX LEDs */
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/* ldr r2, [r3] / need to read it back to make sure the value latches (see MSC section of manual) */
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/* */
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/* ldr r1, =LED_BLANK */
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/* mov r0, #0xFF */
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/* str r0, [r1] / turn on hex leds */
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/* */
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/*loop: */
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/* */
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/* ldr r0, =0xB0070001 */
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/* ldr r1, =_LED */
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/* str r0, [r1] / hex display */
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/* ---------------------------------------------------------------- */
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/* Enable memory interface */
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/* */
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/* The sequence below is based on the recommended init steps */
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/* detailed in the Intel PXA250 Operating Systems Developers Guide, */
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/* Chapter 10. */
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/* ---------------------------------------------------------------- */
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/* ---------------------------------------------------------------- */
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/* Step 1: Wait for at least 200 microsedonds to allow internal */
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/* clocks to settle. Only necessary after hard reset... */
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/* FIXME: can be optimized later */
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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, */
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/* 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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ldr r1, =MEMC_BASE /* get memory controller base addr. */
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/* ---------------------------------------------------------------- */
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/* Step 2a: Initialize Asynchronous static memory controller */
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/* ---------------------------------------------------------------- */
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/* MSC registers: timing, bus width, mem type */
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/* MSC0: nCS(0,1) */
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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] /* read back to ensure */
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/* that data latches */
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/* MSC1: nCS(2,3) */
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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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/* MSC2: nCS(4,5) */
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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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/* ---------------------------------------------------------------- */
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/* Step 2b: Initialize Card Interface */
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/* ---------------------------------------------------------------- */
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/* MECR: Memory Expansion Card Register */
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ldr r2, =CONFIG_SYS_MECR_VAL
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str r2, [r1, #MECR_OFFSET]
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ldr r2, [r1, #MECR_OFFSET]
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/* MCMEM0: Card Interface slot 0 timing */
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ldr r2, =CONFIG_SYS_MCMEM0_VAL
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str r2, [r1, #MCMEM0_OFFSET]
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ldr r2, [r1, #MCMEM0_OFFSET]
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/* MCMEM1: Card Interface slot 1 timing */
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ldr r2, =CONFIG_SYS_MCMEM1_VAL
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str r2, [r1, #MCMEM1_OFFSET]
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ldr r2, [r1, #MCMEM1_OFFSET]
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/* MCATT0: Card Interface Attribute Space Timing, slot 0 */
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ldr r2, =CONFIG_SYS_MCATT0_VAL
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str r2, [r1, #MCATT0_OFFSET]
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ldr r2, [r1, #MCATT0_OFFSET]
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/* MCATT1: Card Interface Attribute Space Timing, slot 1 */
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ldr r2, =CONFIG_SYS_MCATT1_VAL
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str r2, [r1, #MCATT1_OFFSET]
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ldr r2, [r1, #MCATT1_OFFSET]
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/* MCIO0: Card Interface I/O Space Timing, slot 0 */
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ldr r2, =CONFIG_SYS_MCIO0_VAL
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str r2, [r1, #MCIO0_OFFSET]
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ldr r2, [r1, #MCIO0_OFFSET]
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/* MCIO1: Card Interface I/O Space Timing, slot 1 */
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ldr r2, =CONFIG_SYS_MCIO1_VAL
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str r2, [r1, #MCIO1_OFFSET]
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ldr r2, [r1, #MCIO1_OFFSET]
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/* ---------------------------------------------------------------- */
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/* Step 2c: Write FLYCNFG FIXME: what's that??? */
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/* ---------------------------------------------------------------- */
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/* test if we run from flash or RAM - RAM/BDI: don't setup RAM */
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adr r3, mem_init /* r0 <- current position of code */
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ldr r2, =mem_init
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cmp r3, r2 /* skip init if in place */
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beq initirqs
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/* ---------------------------------------------------------------- */
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/* Step 2d: Initialize Timing for Sync Memory (SDCLK0) */
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/* ---------------------------------------------------------------- */
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/* Before accessing MDREFR we need a valid DRI field, so we set */
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/* this to power on defaults + DRI field. */
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ldr r3, =CONFIG_SYS_MDREFR_VAL
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ldr r2, =0xFFF
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and r3, r3, r2
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ldr r4, =0x03ca4000
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orr r4, r4, r3
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str r4, [r1, #MDREFR_OFFSET] /* write back MDREFR */
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ldr r4, [r1, #MDREFR_OFFSET]
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/* ---------------------------------------------------------------- */
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/* Step 3: Initialize Synchronous Static Memory (Flash/Peripherals) */
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/* ---------------------------------------------------------------- */
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/* Initialize SXCNFG register. Assert the enable bits */
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/* Write SXMRS to cause an MRS command to all enabled banks of */
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/* synchronous static memory. Note that SXLCR need not be written */
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/* at this time. */
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/* FIXME: we use async mode for now */
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/* ---------------------------------------------------------------- */
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/* Step 4: Initialize SDRAM */
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/* ---------------------------------------------------------------- */
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/* Step 4a: assert MDREFR:K?RUN and configure */
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/* MDREFR:K1DB2 and MDREFR:K2DB2 as desired. */
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ldr r4, =CONFIG_SYS_MDREFR_VAL
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str r4, [r1, #MDREFR_OFFSET] /* write back MDREFR */
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ldr r4, [r1, #MDREFR_OFFSET]
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/* Step 4b: de-assert MDREFR:SLFRSH. */
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bic r4, r4, #(MDREFR_SLFRSH)
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str r4, [r1, #MDREFR_OFFSET] /* write back MDREFR */
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ldr r4, [r1, #MDREFR_OFFSET]
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/* Step 4c: assert MDREFR:E1PIN and E0PIO */
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orr r4, r4, #(MDREFR_E1PIN|MDREFR_E0PIN)
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str r4, [r1, #MDREFR_OFFSET] /* write back MDREFR */
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ldr r4, [r1, #MDREFR_OFFSET]
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/* Step 4d: write MDCNFG with MDCNFG:DEx deasserted (set to 0), to */
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/* configure but not enable each SDRAM partition pair. */
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ldr r4, =CONFIG_SYS_MDCNFG_VAL
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bic r4, r4, #(MDCNFG_DE0|MDCNFG_DE1)
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str r4, [r1, #MDCNFG_OFFSET] /* write back MDCNFG */
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ldr r4, [r1, #MDCNFG_OFFSET]
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/* Step 4e: Wait for the clock to the SDRAMs to stabilize, */
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/* 100..200 <20>sec. */
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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, */
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/* 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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/* Step 4f: Trigger a number (usually 8) refresh cycles by */
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/* attempting non-burst read or write accesses to disabled */
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/* SDRAM, as commonly specified in the power up sequence */
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/* documented in SDRAM data sheets. The address(es) used */
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/* for this purpose must not be cacheable. */
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/* There should 9 writes, since the first write doesn't */
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/* trigger a refresh cycle on PXA250. See Intel PXA250 and */
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/* PXA210 Processors Specification Update, */
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/* Jan 2003, Errata #116, page 30. */
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ldr r3, =CONFIG_SYS_DRAM_BASE
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str r2, [r3]
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str r2, [r3]
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str r2, [r3]
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str r2, [r3]
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str r2, [r3]
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str r2, [r3]
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str r2, [r3]
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str r2, [r3]
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str r2, [r3]
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/* Step 4g: Write MDCNFG with enable bits asserted */
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/* (MDCNFG:DEx set to 1). */
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ldr r3, [r1, #MDCNFG_OFFSET]
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orr r3, r3, #(MDCNFG_DE0|MDCNFG_DE1)
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str r3, [r1, #MDCNFG_OFFSET]
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/* Step 4h: Write MDMRS. */
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ldr r2, =CONFIG_SYS_MDMRS_VAL
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str r2, [r1, #MDMRS_OFFSET]
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/* We are finished with Intel's memory controller initialisation */
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/* ---------------------------------------------------------------- */
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/* Disable (mask) all interrupts at interrupt controller */
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/* ---------------------------------------------------------------- */
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initirqs:
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mov r1, #0 /* clear int. level register (IRQ, not FIQ) */
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ldr r2, =ICLR
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str r1, [r2]
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ldr r2, =ICMR /* mask all interrupts at the controller */
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str r1, [r2]
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/* ---------------------------------------------------------------- */
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/* Clock initialisation */
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/* ---------------------------------------------------------------- */
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initclks:
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/* Disable the peripheral clocks, and set the core clock frequency */
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/* (hard-coding at 398.12MHz for now). */
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/* Turn Off ALL on-chip peripheral clocks for re-configuration */
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/* Note: See label 'ENABLECLKS' for the re-enabling */
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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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/* default value in case no valid rotary switch setting is found */
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ldr r2, =(CCCR_L27|CCCR_M2|CCCR_N10) /* DEFAULT: {200/200/100} */
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/* ... and write the core clock config register */
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ldr r1, =CCCR
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str r2, [r1]
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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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*/
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/* NOTE: spin here until OSCC.OOK get set, meaning the PLL */
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/* has settled. */
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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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/* ---------------------------------------------------------------- */
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/* */
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/* ---------------------------------------------------------------- */
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/* Save SDRAM size */
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ldr r1, =DRAM_SIZE
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str r8, [r1]
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/* Interrupt init: Mask all interrupts */
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ldr r0, =ICMR /* enable no sources */
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mov r1, #0
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str r1, [r0]
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/* FIXME */
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#ifndef DEBUG
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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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/* ---------------------------------------------------------------- */
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/* End lowlevel_init */
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/* ---------------------------------------------------------------- */
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endlowlevel_init:
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mov pc, lr
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