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/* Cstartup header for the application to be started by at91dfu
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* (C) 2006 by Harald Welte <hwelte@hmw-consulting.de>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (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, MA 02111-1307 USA
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*
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*/
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//#define DEBUG_LL
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.equ AIC_FVR, (260)
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.equ AIC_EOICR, (304)
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.equ AT91C_BASE_AIC, (0xFFFFF000)
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.equ ARM_MODE_FIQ, 0x11
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.equ ARM_MODE_IRQ, 0x12
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.equ ARM_MODE_SVC, 0x13
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.equ I_BIT, 0x80
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.equ F_BIT, 0x40
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#define AT91C_BASE_PIOA 0xFFFFF400
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#define AT91C_BASE_TC0 0xFFFA0000
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#define AT91C_TC_SWTRG (1 << 2)
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#define PIOA_SODR 0x30
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#define PIOA_CODR 0x34
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#define PIOA_PDSR 0x3c
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#define PIOA_ISR 0x4c
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#define PIOA_IDR 0x44
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#define PIO_DATA (1 << 27)
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#define TC_CCR 0x00
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#define PIO_LED1 (1 << 25) /* this only works on OpenPICC, not Olimex */
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#ifdef DEBUG_LL
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/* Debugging macros for switching on/off LED1 (green) */
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#define PIOA_PER 0xFFFFF400
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#define PIOA_OER 0xFFFFF410
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.macro led1on
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ldr r2, =AT91C_BASE_PIOA
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mov r1, #PIO_LED1
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str r1, [r2, #PIOA_CODR]
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.endm
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.macro led1off
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ldr r2, =AT91C_BASE_PIOA
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mov r1, #PIO_LED1
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str r1, [r2, #PIOA_SODR]
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.endm
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.macro ledinit
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ldr r2, =PIOA_PER
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mov r1, #PIO_LED1
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str r1, [r2]
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ldr r2, =PIOA_OER
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str r1, [r2]
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led1off
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.endm
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#else
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.macro ledinit
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.endm
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.macro led1on
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.endm
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.macro led1off
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.endm
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#endif
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.global _startup
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.func _startup
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_startup:
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#ifndef RUN_FROM_RAM
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/* Relocate .data section (copy from Flash to RAM) */
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ldr r1, =_etext
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ldr r2, =_data
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ldr r3, =_edata
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loop_r: cmp r2, r3
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ldrlo r0, [r1], #4
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strlo r0, [r2], #4
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blo loop_r
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#endif
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/* Clear .bss section (Zero init) */
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mov r0, #0
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ldr r1, =__bss_start__
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ldr r2, =__bss_end__
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loop_z: cmp r1, r2
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strlo r0, [r1], #4
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blo loop_z
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/* initialize FIQ mode registers */
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msr CPSR_c, #ARM_MODE_FIQ | I_BIT | F_BIT
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ldr r10, =AT91C_BASE_PIOA
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ldr r12, =AT91C_BASE_TC0
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mov r9, #AT91C_TC_SWTRG
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msr CPSR_c, #ARM_MODE_SVC
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led1on
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/* prepare C function call to main */
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mov r0, #0 /* argc = 0 */
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ldr lr, =exit
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ldr r10, =main
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bx r10
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.size _startup, . - _startup
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.endfunc
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/* "exit" dummy to avoid sbrk write read etc. needed by the newlib default "exit" */
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.global exit
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.func exit
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exit:
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b .
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.size exit, . - exit
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.endfunc
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#define LED_TRIGGER
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#define CALL_PIO_IRQ_DEMUX
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.text
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.arm
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.section .fastrun, "ax"
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.global fiq_handler
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.func fiq_handler
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fiq_handler:
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/* code that uses pre-initialized FIQ reg */
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/* r8 AT91C_BASE_AIC (dfu init)
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r9 AT91C_TC_SWTRG
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r10 AT91C_BASE_PIOA
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r11 tmp
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r12 AT91C_BASE_TC0
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r13 stack
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r14 lr
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*/
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ldr r8, [r10, #PIOA_ISR]
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tst r8, #PIO_DATA /* check for PIO_DATA change */
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ldrne r11, [r10, #PIOA_PDSR]
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tstne r11, #PIO_DATA /* check for PIO_DATA == 1 */
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strne r9, [r12, #TC_CCR] /* software trigger */
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#ifdef LED_TRIGGER
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movne r11, #PIO_LED1
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strne r11, [r10, #PIOA_CODR] /* enable LED */
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#endif
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#if 1
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movne r11, #PIO_DATA
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strne r11, [r10, #PIOA_IDR] /* disable further PIO_DATA FIQ */
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#endif
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/*- Mark the End of Interrupt on the AIC */
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ldr r11, =AT91C_BASE_AIC
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str r11, [r11, #AIC_EOICR]
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#ifdef LED_TRIGGER
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mov r11, #PIO_LED1
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str r11, [r10, #PIOA_SODR] /* disable LED */
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#endif
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#ifdef CALL_PIO_IRQ_DEMUX
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/* push r0, r1-r3, r12, r14 onto FIQ stack */
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stmfd sp!, { r0-r3, r12, lr}
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mov r0, r8
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/* enable interrupts while handling demux */
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/* msr CPSR_c, #F_BIT | ARM_MODE_SVC */
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/* Call C function, give PIOA_ISR as argument */
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ldr r11, =__pio_irq_demux
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mov r14, pc
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bx r11
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/* msr CPSR_c, #I_BIT | F_BIT | ARM_MODE_FIQ */
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ldmia sp!, { r0-r3, r12, lr }
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#endif
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/*- Restore the Program Counter using the LR_fiq directly in the PC */
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subs pc, lr, #4
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.size fiq_handler, . - fiq_handler
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.endfunc
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.end
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