/********************************************************************
* lpc214x/lpc214x_head.S
*
* Copyright (C) 2007 Gregory Nutt. All rights reserved.
* Author: Gregory Nutt <spudmonkey@racsa.co.cr>
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
*
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in
* the documentation and/or other materials provided with the
* distribution.
* 3. Neither the name Gregory Nutt nor the names of its contributors may be
* used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
* FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
* COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
* BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
* OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
* AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
* ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
* POSSIBILITY OF SUCH DAMAGE.
*
********************************************************************/
/********************************************************************
* Included Files
********************************************************************/
#include <nuttx/config.h>
#include "up_internal.h"
#include "up_arch.h"
/********************************************************************
* Definitions
********************************************************************/
/* This file holds the NuttX start logic that runs when the LPC2148
* is reset. This logic must be located at address 0x0000:0000 in
* flash but may be linked to run at different locations based on
* the selected mode:
*
* default: Executes from 0x0000:0000. In non-default modes, the
* MEMAP register is set override the settings of the CPU configuration
* pins.
*
* CONFIG_EXTMEM_MODE: Code executes from external memory starting at
* address 0x8000:0000.
*
* CONFIG_RAM_MODE: Code executes from on-chip RAM at address
* 0x4000:0000.
*
* Starupt Code must be linked to run at the correct address
* corresponding to the selected mode.
*/
#if defined(CONFIG_EXTMEM_MODE)
# if CONFIG_CODE_BASE != LPC214X_EXTMEM_BASE
# error "CONFIG_CODE_BASE must be 0x80000000 in EXTMEM mode"
# endif
#elif defined(CONFIG_RAM_MODE)
# if CONFIG_CODE_BASE != LPC214X_ONCHIP_RAM_BASE
# error "CONFIG_CODE_BASE must be 0x40000000 in EXTMEM mode"
# endif
#else
# if CONFIG_CODE_BASE != LPC214X_FLASH_BASE
# error "CONFIG_CODE_BASE must be 0x00000000 in default mode"
# endif
#endif
/* Phase Locked Loop (PLL) initialization values
*
* BIT 0:4 MSEL: PLL Multiplier "M" Value
* CCLK = M * Fosc
* BIT 5:6 PSEL: PLL Divider "P" Value
* Fcco = CCLK * 2 * P
* 156MHz <= Fcco <= 320MHz
*/
#ifndef CONFIG_PLLCFG_VALUE /* Can be selected from config file */
# define CONFIG_PLLCFG_VALUE 0x00000024
#endif
/* Memory Accelerator Module (MAM) initialization values
*
* MAM Control Register
* BIT 0:1 Mode
* 0 = Disabled
* 1 = Partially Enabled
* 2 = Fully Enabled
* MAM Timing Register
* BIT 0:2 Fetch Cycles
* 0 = Reserved
* 1 = 1
* 2 = 2
* 3 = 3
* 4 = 4
* 5 = 5
* 6 = 6
* 7 = 7
*/
#ifndef CONFIG_MAMCR_VALUE /* Can be selected from config file */
# define CONFIG_MAMCR_VALUE 0x00000002
#endif
#ifndef CONFIG_MAMTIM_VALUE /* Can be selected from config file */
# define CONFIG_MAMTIM_VALUE 0x00000004
#endif
/* VPBDIV initialization values
*
* BITS 0:1 VPB Peripheral Bus Clock Rate
* 0 = VPB Clock = CPU Clock / 4
* 1 = VPB Clock = CPU Clock
* 2 = VPB Clock = CPU Clock / 2
* BITS 4:5 XCLKDIV: XCLK Pin
* 0 = XCLK Pin = CPU Clock / 4
* 1 = XCLK Pin = CPU Clock
* 2 = XCLK Pin = CPU Clock / 2
*/
#ifndef CONFIG_VPBDIV_VALUE /* Can be selected from config file */
# define CONFIG_VPBDIV_VALUE 0x00000001
#endif
/* External Memory Controller (EMC) initialization values
*
* Bank Configuration n (BCFG0..3)
* BIT 0:3 IDCY: Idle Cycles (0-15)
* BIT 5:9 WST1: Wait States 1 (0-31)
* BIT 11:15 WST2: Wait States 2 (0-31)
* BIT 10 RBLE: Read Byte Lane Enable
* BIT 26 WP: Write Protect
* BIT 27 BM: Burst ROM
* BIT 28:29 MW: Memory Width (0=8-bit 1=16-bit 2=32-bit 3=Reserved)
*/
#ifndef CONFIG_BCFG0_VALUE /* Can be selected from config file */
# define CONFIG_BCFG0_VALUE 0x0000fbef
#endif
#ifndef CONFIG_BCFG1_VALUE /* Can be selected from config file */
# define CONFIG_BCFG1_VALUE 0x0000fbef
#endif
#ifndef CONFIG_BCFG2_VALUE /* Can be selected from config file */
# define CONFIG_BCFG2_VALUE 0x0000fbef
#endif
#ifndef CONFIG_BCFG3_VALUE /* Can be selected from config file */
# define CONFIG_BCFG3_VALUE 0x0000fbef
#endif
/* The following are used to configure the ADC/DAC */
#ifndef CONFIG_AD0CR_VALUE
# define CONFIG_AD0CR_VALUE 0x00200402; /* Setup A/D: 10-bit AIN0 @ 3MHz */
#endif
/* GIO Pin Selection Register settings
*
* PINSEL0 configures GPIO 0.0 through 0.15
*/
#ifndef CONFIG_PINSEL0_VALUE /* Can be selected from config file */
# define CONFIG_PINSEL0_VALUE 0x00000000 /* Reset value */
#endif
/* PINSEL1 configures GPIO 0.16 through 0.30 and GPO */
#ifndef CONFIG_PINSEL1_VALUE /* Can be selected from the config file */
# ifdef CONFIG_ADC_SETUP
# define CONFIG_PINSEL1_VALUE 0x01000000; /* Enable DAC */
# else
# define CONFIG_PINSEL1_VALUE 0x00000000; /* Reset value */
# endif
#endif
/* External Memory Pins definitions
* BIT 0:1 Reserved
* BIT 2 GPIO/DEBUG
* BIT 3 GPIO/TRACE
* BIT 31:4 Reserved
* CS0..3, OE, WE, BLS0..3, D0..31, A2..23, JTAG Pins
*/
#ifndef CONFIG_PINSEL2_VALUE /* Can be selected from config file */
# define CONFIG_PINSEL2_VALUE 0x0e6149e4
#endif
/********************************************************************
* Macros
********************************************************************/
/* Print a character on the UART to show boot status. This macro will
* modify r0, r1, r2 and r14
*/
.macro showprogress, code
#ifdef CONFIG_DEBUG
mov r0, #\code
bl up_lowputc
#endif
.endm
/* Configured the PINSEL2 register if EXTMEM mode is selected */
.macro configpinsel2, base, val
#ifdef CONFIG_EXTMEM_MODE
ldr \base, =LPC214X_PINSEL2
ldr \val, =CONFIG_PINSEL2_VALUE
str \val, [\base]
#endif
.endm
/* Configure the external memory controller */
.macro configemc, base, val
#ifdef CONFIG_EMC_SETUP
ldr \base, =LPC214X_EMC_BASE
#ifdef CONFIG_BCFG0_SETUP
ldr \val, =CONFIG_BCFG0_VALUE
str \val, [\base, #LPC214X_BCFG0_OFFSET]
#endif
#ifdef CONFIG_BCFG1_SETUP
ldr \val, =CONFIG_BCFG1_VALUE
str \val, [\base, #LPC214X_BCFG1_OFFSET]
#endif
#ifdef CONFIG_BCFG2_SETUP
ldr \val, =CONFIG_BCFG2_VALUE
str \val, [\base, #LPC214X_BCFG2_OFFSET]
#endif
#ifdef CONFIG_BCFG3_SETUP
ldr \val, =CONFIG_BCFG3_VALUE
str \val, [\base, #LPC214X_BCFG3_OFFSET]
#endif
#endif
.endm
/* Configure VPBDIV */
.macro configvpbdiv, base, val
#ifdef CONFIG_VPBDIV_SETUP
ldr \base, =LPC214X_VPBDIV
ldr \val, =CONFIG_VPBDIV_VALUE
str \val, [\base]
#endif
.endm
/* Configure the PLL */
.macro configpll, base, val1, val2, val3
#ifdef LPC214X_PLL_SETUP
ldr \base, =LPC214X_PLL_BASE
mov \val1, #0xaa
mov \val2, #0x55
/* Configure and Enable PLL */
mov \val3, #CONFIG_PLLCFG_VALUE
str \val3, [\base, #LPC214X_PLLCFG_OFFSET]
mov \val3, #LPC214X_PLLCON_PLLE
str \val3, [\base, #LPC214X_PLLCON_OFFSET]
str \val1, [\base, #LPC214X_PLLFEED_OFFSET]
str \val2, [\base, #LPC214X_PLLFEED_OFFSET]
/* Wait until PLL Locked */
1:
ldr \val3, [\base, #LPC214X_PLLSTAT_OFFSET]
ands \val3, \val3, #LPC214X_PLLSTAT_PLOCK
beq 1b
/* Switch to PLL Clock */
mov \val3, #(LPC214X_PLLCON_PLLE | LPC214X_PLLCON_PLLC)
str \val3, [\base, #LPC214X_PLLCON__OFFSET]
str \val1, [\base, #LPC214X_PLLFEED_OFFSET]
str \val2, [\base, #LPC214X_PLLFEED_OFFSET]
#endif
.endm
/* Configure the Memory Accelerator Module (MAM) */
.macro configmam, base, val
#ifdef CONFIG_MAM_SETUP
ldr \base, =LPC214X_MAM_BASE
mov \val, #CONFIG_MAMTIM_VALUE
str \val, [\base, #LPC214x_MAM_TIM_OFFSET]
mov \val, #CONFIG_MAMCR_VALUE
str \val, [\base, #LPC214X_MAM_CR_OFFSET]
#endif
.endm
/* Setup MEMMAP for the selected mode of operation */
.macro configmemmap, base, val
ldr \base, =LPC214X_MEMMAP
#if defined(CONFIG_EXTMEM_MODE)
mov \val, #3
#elif defined(CONFIG_RAM_MODE)
mov \val, #2
#else /* Setting the default should not be necessary */
mov \val, #1
#endif
str \val, [\base]
.endm
.macro configdac, base, tmp
#ifdef CONFIG_ADC_SETUP
ldr \base, =LPC214X_AD0_BASE
ldr \tmp, =CONFIG_AD0CR_VALUE
str \tmp, [\base, #LPC214X_AD_ADCR_OFFSET]
ldr \base,=LPC214X_PINSEL1
ldr \tmp, =CONFIG_PINSEL1_VALUE
str \tmp, [\base]
#endif
.endm
/********************************************************************
* Text
********************************************************************/
.text
/********************************************************************
* Name: _vector_table
*
* Description:
* Interrrupt vector table. This must be located at the beginning
* of the memory space (at CONFIG_CODE_BASE). The first entry in
* the vector table is the reset vector and this is the code that
* will execute whn the processor is reset.
*
********************************************************************/
.globl _vector_table
.type _vector_table, %function
_vector_table:
ldr pc, .Lresethandler /* 0x00: Reset */
ldr pc, .Lundefinedhandler /* 0x04: Undefined instruction */
ldr pc, .Lswihandler /* 0x08: Software interrupt */
ldr pc, .Lprefetchaborthandler /* 0x0c: Prefetch abort */
ldr pc, .Ldataaborthandler /* 0x10: Data abort */
ldr pc, .Laddrexcptnhandler /* 0x14: Address exception */
ldr pc, .Lirqhandler /* 0x18: IRQ */
ldr pc, .Lfiqhandler /* 0x1c: FIQ */
.globl __start
.globl up_vectorundefinsn
.globl up_vectorswi
.globl up_vectorprefetch
.globl up_vectordata
.globl up_vectoraddrexcptn
.globl up_vectorirq
.globl up_vectorfiq
.Lresethandler:
.long __start
.Lundefinedhandler:
.long up_vectorundefinsn
.Lswihandler:
.long up_vectorswi
.Lprefetchaborthandler:
.long up_vectorprefetch
.Ldataaborthandler:
.long up_vectordata
.Laddrexcptnhandler:
.long up_vectoraddrexcptn
.Lirqhandler:
.long up_vectorirq
.Lfiqhandler:
.long up_vectorfiq
.size _vector_table, . - _vector_table
/********************************************************************
* Name: __start
*
* Description:
* Reset entry point. This is the first function to execute when
* the processor is reset. It initializes hardware and then gives
* control to NuttX.
*
********************************************************************/
.global __start
.type __start, #function
__start:
/* Setup the initial processor mode */
mov r0, #(SVC_MODE | PSR_I_BIT | PSR_F_BIT )
msr cpsr, r0
/* Set up external memory mode (if so selected) */
configpinsel2 r0, r1
/* Setup the External Memory Controllor (EMC) as configured */
configemc r0, r1
/* Configure VPBDIV */
configvpbdiv r0, r1
/* Configure the PLL */
configpll r0, r1, r2, r3
/* Configure the Memory Accelerator Module (MAM) */
configmam r0, r1
/* Setup MEMMAP for the selected mode of operation */
configmemmap r0, r1
/* Configure the DAC and ADC */
configdac r0, r1
/* Configure the uart so that we can get debug output as soon
* as possible. Modifies r0, r1, r2, and r14.
*/
bl up_lowsetup
showprogress 'A'
/* Setup system stack (and get the BSS range) */
adr r0, LC0
ldmia r0, {r4, r5, sp}
/* Clear system BSS section */
mov r0, #0
1: cmp r4, r5
strcc r0, [r4], #4
bcc 1b
showprogress 'B'
/* Copy system .data sections to new home in RAM. */
#ifdef CONFIG_BOOT_FROM_FLASH
adr r3, LC2
ldmia r3, {r0, r1, r2}
1: ldmia r0!, {r3 - r10}
stmia r1!, {r3 - r10}
cmp r1, r2
blt 1b
#endif
/* Perform early serial initialization */
mov fp, #0
bl up_earlyserialinit
#ifdef CONFIG_DEBUG
mov r0, #'C'
bl up_putc
mov r0, #'\n'
bl up_putc
#endif
/* Initialize onboard LEDs */
#ifdef CONFIG_ARCH_LEDS
bl up_ledinit
#endif
/* Then jump to OS entry */
b os_start
/* Variables:
* _sbss is the start of the BSS region (see ld.script)
* _ebss is the end of the BSS regsion (see ld.script)
* The idle task stack starts at the end of BSS and is
* of size CONFIG_PROC_STACK_SIZE. The heap continues
* from there until the end of memory. See g_heapbase
* below.
*/
LC0: .long _sbss
.long _ebss
.long _ebss+CONFIG_PROC_STACK_SIZE-4
#ifdef CONFIG_BOOT_FROM_FLASH
LC2: .long _eronly /* Where .data defaults are stored in FLASH */
.long _sdata /* Where .data needs to reside in SDRAM */
.long _edata
#endif
.size __start, .-__start
/* This global variable is unsigned long g_heapbase and is
* exported from here only because of its coupling to LCO
* above.
*/
.data
.align 4
.globl g_heapbase
.type g_heapbase, object
g_heapbase:
.long _ebss+CONFIG_PROC_STACK_SIZE
.size g_heapbase, .-g_heapbase
.end
