From 39cb47ed0951074afb24687fcb6e66947b4f8ef8 Mon Sep 17 00:00:00 2001 From: henryk Date: Wed, 7 Nov 2007 16:28:57 +0000 Subject: Start working at dfu by copying from main openpcd repository (with modifications), doesn't boot application yet git-svn-id: https://svn.openpcd.org:2342/trunk@315 6dc7ffe9-61d6-0310-9af1-9938baff3ed1 --- openpicc/os/boot/Cstartup.S | 450 +++++++++++++++++++++++++++++++++++++++ openpicc/os/boot/Cstartup_SAM7.c | 101 +++++---- openpicc/os/boot/Cstartup_app.S | 194 +++++++++++++++++ 3 files changed, 706 insertions(+), 39 deletions(-) create mode 100644 openpicc/os/boot/Cstartup.S create mode 100644 openpicc/os/boot/Cstartup_app.S (limited to 'openpicc/os') diff --git a/openpicc/os/boot/Cstartup.S b/openpicc/os/boot/Cstartup.S new file mode 100644 index 0000000..83e7696 --- /dev/null +++ b/openpicc/os/boot/Cstartup.S @@ -0,0 +1,450 @@ +/* AT91SAM7 low-level startup outines for OpenPCD / OpenPICC DFU loader + * (C) 2006 by Harald Welte + * + * 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 + * + */ + +/*------------------------------------------------------------------------------ +//*- ATMEL Microcontroller Software Support - ROUSSET - +//*------------------------------------------------------------------------------ +//* The software is delivered "AS IS" without warranty or condition of any +//* kind, either express, implied or statutory. This includes without +//* limitation any warranty or condition with respect to merchantability or +//* fitness for any particular purpose, or against the infringements of +//* intellectual property rights of others. +//*----------------------------------------------------------------------------- +//*- File source : Cstartup.s +//*- Object : Generic CStartup for KEIL and GCC No Use REMAP +//*- Compilation flag : None +//*- +//*- 1.0 18/Oct/04 JPP : Creation +//*- 1.1 21/Feb/05 JPP : Set Interrupt +//*- 1.1 01/Apr/05 JPP : save SPSR +//*-----------------------------------------------------------------------------*/ + +/* Enable DFU by press of hardware POI_BOOTLDR switch */ +#define CONFIG_DFU_SWITCH + +/* Enable DFU by magic value in RAM and software reset */ +#define CONFIG_DFU_MAGIC + +//#define DEBUG_LL + +#define PIOA_PER 0xFFFFF400 +#define PIOA_OER 0xFFFFF410 +#define PIOA_SODR 0xFFFFF430 +#define PIOA_CODR 0xFFFFF434 +#define LED1 25 /* this only works on OpenPICC, not Olimex */ + +#ifdef DEBUG_LL +/* Debugging macros for switching on/off LED1 (green) */ + .macro led1on + ldr r2, =PIOA_CODR + mov r1, #(1 << LED1) + str r1, [r2] + .endm + .macro led1off + ldr r2, =PIOA_SODR + mov r1, #(1 << LED1) + str r1, [r2] + .endm + .macro ledinit + ldr r2, =PIOA_PER + mov r1, #(1 << LED1) + str r1, [r2] + ldr r2, =PIOA_OER + str r1, [r2] + led1off + .endm +#else + .macro ledinit + .endm + .macro led1on + .endm + .macro led1off + .endm +#endif + + .equ IRQ_Stack_Size, 0x00000400 + .equ FIQ_Stack_Size, 0x00000400 + + .equ AIC_IVR, (256) + .equ AIC_FVR, (260) + .equ AIC_EOICR, (304) + .equ AIC_MCR_RCR, (0xf00) + .equ AT91C_BASE_AIC, (0xFFFFF000) + .equ AT91C_PMC_PCER, (0xFFFFFC10) + .equ AT91C_BASE_PIOA, (0xFFFFF400) + .equ AT91C_ID_PIOA, (2) + .equ PIOA_PDSR, (0x3c) +#if defined(PCD) + .equ PIO_BOOTLDR, (1 << 27) +#elif defined(PICC) + .equ PIO_BOOTLDR, (1 << 6) +#elif defined(OLIMEX) + .equ PIO_BOOTLDR, (1 << 19) +#else +#error please define PIO_BOOTLDR +#endif + + +/* #include "AT91SAM7S64_inc.h" */ + +/* Exception Vectors in RAM */ + + .text + .arm + .section .vectram, "ax" + + .global _remap_call_dfu + .func _remap_call_dfu +_remap_call_dfu: + led1on + /* Remap RAM to 0x00000000 for DFU */ + ldr r1, =AT91C_BASE_AIC + mov r2, #0x01 + str r2, [r1, #AIC_MCR_RCR] + + ldr r4, =dfu_main + bx r4 + + .size _remap_call_dfu, . - _remap_call_dfu + .endfunc + + +#;------------------------------------------------------------------------------ +#;- Section Definition +#;----------------- +#;- Section +#;- .internal_ram_top Top_Stack: used by the cstartup for vector initalisation +#;- management defined by ld and affect from ldscript +#;------------------------------------------------------------------------------ + .section .internal_ram_top + .code 32 + .align 0 + .global Top_Stack +Top_Stack: + +/*------------------------------------------------------------------------------ +*- Area Definition +*------------------------------------------------------------------------------ +* .text is used instead of .section .text so it works with arm-aout too. */ + .section .reset + .text +reset: +/*------------------------------------------------------------------------------ +//*- Exception vectors +//*-------------------- +//*- These vectors can be read at address 0 or at RAM address +//*- They ABSOLUTELY requires to be in relative addresssing mode in order to +//*- guarantee a valid jump. For the moment, all are just looping. +//*- If an exception occurs before remap, this would result in an infinite loop. +//*- To ensure if a exeption occurs before start application to infinite loop. +//*------------------------------------------------------------------------------*/ + + B InitReset /* 0x00 Reset handler */ +undefvec: + B undefvec /* 0x04 Undefined Instruction */ +swivec: + B swivec /* 0x08 Software Interrupt */ +pabtvec: + B pabtvec /* 0x0C Prefetch Abort */ +dabtvec: + b dabtvec /* 0x10 Data Abort */ +rsvdvec: + b rsvdvec /* 0x14 reserved */ +irqvec: + b IRQ_Handler_Entry /* 0x18 IRQ */ +fiqvec: + ldr pc, [pc, #-0xF20] /* 0x1c FIQ */ + +dfu_state_dummy: + .word 0 + + .global IRQ_Handler_Entry + .func IRQ_Handler_Entry + +FIQ_Handler_Entry: + +/*- Switch in SVC/User Mode to allow User Stack access for C code */ +/* because the FIQ is not yet acknowledged*/ + +/*- Save and r0 in FIQ_Register */ + mov r9, r0 + ldr r0, [r8, #AIC_FVR] + msr CPSR_c, #I_BIT | F_BIT | ARM_MODE_SVC + + /*- Save scratch/used registers and LR in User Stack */ + stmfd sp!, { r1-r3, r12, lr} + + /*- Branch to the routine pointed by the AIC_FVR */ + mov r14, pc + bx r0 + + /*- Restore scratch/used registers and LR from User Stack */ + ldmia sp!, { r1-r3, r12, lr} + + /*- Leave Interrupts disabled and switch back in FIQ mode */ + msr CPSR_c, #I_BIT | F_BIT | ARM_MODE_FIQ + + /*- Restore the R0 ARM_MODE_SVC register */ + mov r0,r9 + + /*- Restore the Program Counter using the LR_fiq directly in the PC */ + subs pc, lr, #4 + +IRQ_Handler_Entry: + + /*- Manage Exception Entry */ + /*- Adjust and save LR_irq in IRQ stack */ + sub lr, lr, #4 + stmfd sp!, {lr} + + /*- Save SPSR need to be saved for nested interrupt */ + mrs r14, SPSR + stmfd sp!, {r14} + + /*- Save and r0 in IRQ stack */ + stmfd sp!, {r0} + + /*- Write in the IVR to support Protect Mode */ + /*- No effect in Normal Mode */ + /*- De-assert the NIRQ and clear the source in Protect Mode */ + ldr r14, =AT91C_BASE_AIC + ldr r0 , [r14, #AIC_IVR] + str r14, [r14, #AIC_IVR] + + /*- Enable Interrupt and Switch in Supervisor Mode */ + msr CPSR_c, #ARM_MODE_SVC + + /*- Save scratch/used registers and LR in User Stack */ + stmfd sp!, { r1-r3, r12, r14} + + /*- Branch to the routine pointed by the AIC_IVR */ + mov r14, pc + bx r0 + + /*- Restore scratch/used registers and LR from User Stack*/ + ldmia sp!, { r1-r3, r12, r14} + + /*- Disable Interrupt and switch back in IRQ mode */ + msr CPSR_c, #I_BIT | ARM_MODE_IRQ + + /*- Mark the End of Interrupt on the AIC */ + ldr r14, =AT91C_BASE_AIC + str r14, [r14, #AIC_EOICR] + + /*- Restore SPSR_irq and r0 from IRQ stack */ + ldmia sp!, {r0} + + /*- Restore SPSR_irq and r0 from IRQ stack */ + ldmia sp!, {r14} + msr SPSR_cxsf, r14 + + /*- Restore adjusted LR_irq from IRQ stack directly in the PC */ + ldmia sp!, {pc}^ + + .size IRQ_Handler_Entry, . - IRQ_Handler_Entry + .endfunc + .align 0 +.RAM_TOP: + .word Top_Stack + + .global _startup + .func _startup +InitReset: +/*------------------------------------------------------------------------------ +/*- Low level Init (PMC, AIC, ? ....) by C function AT91F_LowLevelInit +/*------------------------------------------------------------------------------*/ + .extern AT91F_LowLevelInit +/*- minumum C initialization */ +/*- call AT91F_LowLevelInit( void) */ + + ldr r13,.RAM_TOP /* temporary stack in internal RAM */ +/*--Call Low level init function in ABSOLUTE through the Interworking */ + ldr r0,=AT91F_LowLevelInit + mov lr, pc + bx r0 + ledinit + +/*------------------------------------------------------------------------------ +//*- Top of Stack Definition +//*------------------------- +//*- Interrupt and Supervisor Stack are located at the top of internal memory in +//*- order to speed the exception handling context saving and restoring. +//*- ARM_MODE_SVC (Application, C) Stack is located at the top of the external memory. +//*------------------------------------------------------------------------------*/ + + .EQU ARM_MODE_FIQ, 0x11 + .EQU ARM_MODE_IRQ, 0x12 + .EQU ARM_MODE_SVC, 0x13 + + .EQU I_BIT, 0x80 + .EQU F_BIT, 0x40 + + +#define AT91C_RSTC_RSR 0xFFFFFD04 +#define AT91C_RSTC_RSTTYP_SOFTWARE (0x03 << 8) +#define DFU_STATE_appDETACH 1 + + +/*------------------------------------------------------------------------------ +//*- Setup the stack for each mode +//*-------------------------------*/ + mov r0,r13 + +/*- Set up Fast Interrupt Mode and set FIQ Mode Stack*/ + msr CPSR_c, #ARM_MODE_FIQ | I_BIT | F_BIT + mov r13, r0 + sub r0, r0, #FIQ_Stack_Size + +/*- Init the FIQ register*/ + ldr r8, =AT91C_BASE_AIC + +/*- Set up Interrupt Mode and set IRQ Mode Stack*/ + msr CPSR_c, #ARM_MODE_IRQ | I_BIT | F_BIT + mov r13, r0 /* Init stack IRQ */ + sub r0, r0, #IRQ_Stack_Size + +/*- Set up Supervisor Mode and set Supervisor Mode Stack*/ + msr CPSR_c, #ARM_MODE_SVC | I_BIT | F_BIT + mov r13, r0 /* Init stack Sup */ + +/* - Enable Interrupts and FIQ */ + msr CPSR_c, #ARM_MODE_SVC + +#ifdef CONFIG_DFU_MAGIC + ldr r1, =AT91C_RSTC_RSR + ldr r2, [r1] + #and r2, r2, AT91C_RSTC_RSTTYP + tst r2, #AT91C_RSTC_RSTTYP_SOFTWARE + beq dfu_magic_end + + ldr r1, =dfu_state + ldr r2, [r1] + cmp r2, #DFU_STATE_appDETACH + beq _reloc_dfu +dfu_magic_end: +#endif + +# Relocate DFU .data.shared section (Copy from ROM to RAM) + LDR R1, =_etext + LDR R2, =_data_shared + LDR R3, =_edata_shared +LoopRelDS: CMP R2, R3 + LDRLO R0, [R1], #4 + STRLO R0, [R2], #4 + BLO LoopRelDS + +/* +# Clear DFU .bss section (Zero init) + MOV R0, #0 + LDR R1, =__bss_start__ + LDR R2, =__bss_end__ +LoopZI: CMP R1, R2 + STRLO R0, [R1], #4 + BLO LoopZI +*/ + + /* prepare c function call to main */ + mov r0, #0 /* argc = 0 */ + ldr lr, =exit + ldr r10, =0x00104000 + +#ifdef CONFIG_DFU_SWITCH + /* check whether bootloader button is pressed */ + ldr r1, =AT91C_PMC_PCER + mov r2, #(1 << AT91C_ID_PIOA) + str r2, [r1] + + ldr r1, =AT91C_BASE_PIOA + ldr r2, [r1, #PIOA_PDSR] + tst r2, #PIO_BOOTLDR + bne _reloc_dfu +#endif + + bx r10 + +_reloc_dfu: + /* Relocate DFU .data section (Copy from ROM to RAM) */ + LDR R1, =_data_flash + LDR R2, =_data + LDR R3, =_edata +LoopRel: CMP R2, R3 + LDRLO R0, [R1], #4 + STRLO R0, [R2], #4 + BLO LoopRel + + /* Clear DFU .bss section (Zero init) */ + MOV R0, #0 + LDR R1, =__bss_start__ + LDR R2, =__bss_end__ +LoopZI: CMP R1, R2 + STRLO R0, [R1], #4 + BLO LoopZI + + /* relocate DFU .text into RAM */ + ldr r1, =0x00100000 + ldr r2, =0x00200000 + ldr r3, =_etext + add r3, r3, r2 +loop_rel_t: cmp r2, r3 + ldrlo r4, [r1], #4 + strlo r4, [r2], #4 + blo loop_rel_t + ldr r4, =_remap_call_dfu + bx r4 + + .size _startup, . - _startup + .endfunc + +/* "exit" dummy to avoid sbrk write read etc. needed by the newlib default "exit" */ + .global exit + .func exit +exit: + b . + .size exit, . - exit + .endfunc + +/*--------------------------------------------------------------- +//* ?EXEPTION_VECTOR +//* This module is only linked if needed for closing files. +//*---------------------------------------------------------------*/ + .global AT91F_Default_FIQ_handler + .func AT91F_Default_FIQ_handler +AT91F_Default_FIQ_handler: + b AT91F_Default_FIQ_handler + .size AT91F_Default_FIQ_handler, . - AT91F_Default_FIQ_handler + .endfunc + + .global AT91F_Default_IRQ_handler + .func AT91F_Default_IRQ_handler +AT91F_Default_IRQ_handler: + b AT91F_Default_IRQ_handler + .size AT91F_Default_IRQ_handler, . - AT91F_Default_IRQ_handler + .endfunc + + .global AT91F_Spurious_handler + .func AT91F_Spurious_handler +AT91F_Spurious_handler: + b AT91F_Spurious_handler + .size AT91F_Spurious_handler, . - AT91F_Spurious_handler + .endfunc + + + + .end + diff --git a/openpicc/os/boot/Cstartup_SAM7.c b/openpicc/os/boot/Cstartup_SAM7.c index 450a95e..4ab263f 100644 --- a/openpicc/os/boot/Cstartup_SAM7.c +++ b/openpicc/os/boot/Cstartup_SAM7.c @@ -8,60 +8,83 @@ //* intellectual property rights of others. //*---------------------------------------------------------------------------- //* File Name : Cstartup_SAM7.c -//* Object : Low level initializations written in C for IAR -//* tools -//* 1.0 08/Sep/04 JPP : Creation -//* 1.10 10/Sep/04 JPP : Update AT91C_CKGR_PLLCOUNT filed +//* Object : Low level initializations written in C for GCC Tools +//* Creation : 12/Jun/04 +//* 1.2 28/Feb/05 JPP : LIB change AT91C_WDTC_WDDIS & PLL +//* 1.3 21/Mar/05 JPP : Change PLL Wait time //*---------------------------------------------------------------------------- - // Include the board file description #include +// The following functions must be write in ARM mode this function called directly +// by exception vector +extern void AT91F_Spurious_handler (void); +extern void AT91F_Default_IRQ_handler (void); +extern void AT91F_Default_FIQ_handler (void); + //*---------------------------------------------------------------------------- //* \fn AT91F_LowLevelInit //* \brief This function performs very low level HW initialization //* this function can be use a Stack, depending the compilation //* optimization mode //*---------------------------------------------------------------------------- -void AT91F_LowLevelInit (void) +void +AT91F_LowLevelInit (void) { - AT91PS_PMC pPMC = AT91C_BASE_PMC; - - //* Set flash wait state - // Single Cycle Access at Up to 30 MHz, or 40 - // if MCK = 47923200 I have 50 Cycle for 1 useconde ( flied MC_FMR->FMCN - AT91C_BASE_MC->MC_FMR = ((AT91C_MC_FMCN) & (75 << 16)) | AT91C_MC_FWS_1FWS; + volatile int i; + + //* Debounce power supply + for(i=0;i<1024;i++); + + AT91PS_PMC pPMC = AT91C_BASE_PMC; + //* Set Flash Waite sate + // Single Cycle Access at Up to 30 MHz, or 40 + // if MCK = 47923200 I have 50 Cycle for 1 usecond ( flied MC_FMR->FMCN + AT91C_BASE_MC->MC_FMR = ((AT91C_MC_FMCN) & (48 << 16)) | AT91C_MC_FWS_1FWS; - //* Watchdog Enable - AT91C_BASE_WDTC->WDTC_WDMR = (0x80 << 16) | AT91C_WDTC_WDRSTEN | 0x80; + //* Set MCK at 47 923 200 + // 1 Enabling the Main Oscillator: + // SCK = 1/32768 = 30.51 uSecond + // Start up time = 8 * 6 / SCK = 56 * 30.51 = 1,46484375 ms + pPMC->PMC_MOR = ((AT91C_CKGR_OSCOUNT) & (0x06 << 8)) | AT91C_CKGR_MOSCEN; + // Wait the startup time + while (!(pPMC->PMC_SR & AT91C_PMC_MOSCS)); + // 2 Checking the Main Oscillator Frequency (Optional) + // 3 Setting PLL and divider: + // - div by 24 Fin = 0,7680 =(18,432 / 24) + // - Mul 125: Fout = 96,0000 =(0,7680 *125) + // for 96 MHz the erroe is 0.16% + // Field out NOT USED = 0 + // PLLCOUNT pll startup time estimate at : 0.844 ms + // PLLCOUNT 28 = 0.000844 /(1/32768) +#if 0 + pPMC->PMC_PLLR = ((AT91C_CKGR_DIV & 0x05) | + (AT91C_CKGR_PLLCOUNT & (28 << 8)) | + (AT91C_CKGR_MUL & (25 << 16))); +#else + pPMC->PMC_PLLR = ((AT91C_CKGR_DIV & 24) | + (AT91C_CKGR_PLLCOUNT & (28 << 8)) | + (AT91C_CKGR_MUL & (125 << 16))); +#endif - //* Set MCK at 47 923 200 - // 1 Enabling the Main Oscillator: - // SCK = 1/32768 = 30.51 uSeconde - // Start up time = 8 * 6 / SCK = 56 * 30.51 = 1,46484375 ms - pPMC->PMC_MOR = (((AT91C_CKGR_OSCOUNT & (0x06 << 8)) | AT91C_CKGR_MOSCEN)); - // Wait the startup time + // Wait the startup time + while (!(pPMC->PMC_SR & AT91C_PMC_LOCK)); + while (!(pPMC->PMC_SR & AT91C_PMC_MCKRDY)); + // 4. Selection of Master Clock and Processor Clock + // select the PLL clock divided by 2 + pPMC->PMC_MCKR = AT91C_PMC_PRES_CLK_2; + while (!(pPMC->PMC_SR & AT91C_PMC_MCKRDY)); - while (!(pPMC->PMC_SR & AT91C_PMC_MOSCS)); - // 2 Checking the Main Oscillator Frequency (Optional) - // 3 Setting PLL and divider: - // - div by 5 Fin = 3,6864 =(18,432 / 5) - // - Mul 25+1: Fout = 95,8464 =(3,6864 *26) - // for 96 MHz the erroe is 0.16% - //eld out NOT USED = 0 Fi - pPMC->PMC_PLLR = ((AT91C_CKGR_DIV & 5) | - (AT91C_CKGR_PLLCOUNT & (28 << 8)) | - (AT91C_CKGR_MUL & (25 << 16))); + pPMC->PMC_MCKR |= AT91C_PMC_CSS_PLL_CLK; + while (!(pPMC->PMC_SR & AT91C_PMC_MCKRDY)); - // Wait the startup time - while (!(pPMC->PMC_SR & AT91C_PMC_LOCK)); - - // 4. Selection of Master Clock and Processor Clock - // select the PLL clock divided by 2 - pPMC->PMC_MCKR = AT91C_PMC_PRES_CLK_2; - while (!(pPMC->PMC_SR & AT91C_PMC_MCKRDY)); + // Set up the default interrupts handler vectors + AT91C_BASE_AIC->AIC_SVR[0] = (int) AT91F_Default_FIQ_handler; + for (i = 1; i < 31; i++) + { + AT91C_BASE_AIC->AIC_SVR[i] = (int) AT91F_Default_IRQ_handler; + } + AT91C_BASE_AIC->AIC_SPU = (int) AT91F_Spurious_handler; - pPMC->PMC_MCKR |= AT91C_PMC_CSS_PLL_CLK; - while (!(pPMC->PMC_SR & AT91C_PMC_MCKRDY)); } diff --git a/openpicc/os/boot/Cstartup_app.S b/openpicc/os/boot/Cstartup_app.S new file mode 100644 index 0000000..448cc93 --- /dev/null +++ b/openpicc/os/boot/Cstartup_app.S @@ -0,0 +1,194 @@ +/* Cstartup header for the application to be started by at91dfu + * (C) 2006 by Harald Welte + * + * 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 + * + */ + + +//#define DEBUG_LL + + .equ AIC_FVR, (260) + .equ AIC_EOICR, (304) + .equ AT91C_BASE_AIC, (0xFFFFF000) + .equ ARM_MODE_FIQ, 0x11 + .equ ARM_MODE_IRQ, 0x12 + .equ ARM_MODE_SVC, 0x13 + + .equ I_BIT, 0x80 + .equ F_BIT, 0x40 + + +#define AT91C_BASE_PIOA 0xFFFFF400 +#define AT91C_BASE_TC0 0xFFFA0000 +#define AT91C_TC_SWTRG (1 << 2) +#define PIOA_SODR 0x30 +#define PIOA_CODR 0x34 +#define PIOA_PDSR 0x3c +#define PIOA_ISR 0x4c +#define PIOA_IDR 0x44 +#define PIO_DATA (1 << 27) +#define TC_CCR 0x00 + + +#define PIO_LED1 (1 << 25) /* this only works on OpenPICC, not Olimex */ + +#ifdef DEBUG_LL +/* Debugging macros for switching on/off LED1 (green) */ +#define PIOA_PER 0xFFFFF400 +#define PIOA_OER 0xFFFFF410 + .macro led1on + ldr r2, =AT91C_BASE_PIOA + mov r1, #PIO_LED1 + str r1, [r2, #PIOA_CODR] + .endm + .macro led1off + ldr r2, =AT91C_BASE_PIOA + mov r1, #PIO_LED1 + str r1, [r2, #PIOA_SODR] + .endm + .macro ledinit + ldr r2, =PIOA_PER + mov r1, #PIO_LED1 + str r1, [r2] + ldr r2, =PIOA_OER + str r1, [r2] + led1off + .endm +#else + .macro ledinit + .endm + .macro led1on + .endm + .macro led1off + .endm +#endif + + .global _startup + .func _startup +_startup: + /* Relocate .data section (copy from Flash to RAM) */ + ldr r1, =_etext + ldr r2, =_data + ldr r3, =_edata +loop_r: cmp r2, r3 + ldrlo r0, [r1], #4 + strlo r0, [r2], #4 + blo loop_r + + /* Clear .bss section (Zero init) */ + mov r0, #0 + ldr r1, =__bss_start__ + ldr r2, =__bss_end__ +loop_z: cmp r1, r2 + strlo r0, [r1], #4 + blo loop_z + + /* initialize FIQ mode registers */ + msr CPSR_c, #ARM_MODE_FIQ | I_BIT | F_BIT + ldr r10, =AT91C_BASE_PIOA + ldr r12, =AT91C_BASE_TC0 + mov r9, #AT91C_TC_SWTRG + msr CPSR_c, #ARM_MODE_SVC + + led1on + + /* prepare C function call to main */ + mov r0, #0 /* argc = 0 */ + ldr lr, =exit + ldr r10, =main + + bx r10 + + .size _startup, . - _startup + .endfunc + +/* "exit" dummy to avoid sbrk write read etc. needed by the newlib default "exit" */ + .global exit + .func exit +exit: + b . + .size exit, . - exit + .endfunc + + +#define LED_TRIGGER +#define CALL_PIO_IRQ_DEMUX + + .text + .arm + .section .fastrun, "ax" + + .global fiq_handler + .func fiq_handler +fiq_handler: + /* code that uses pre-initialized FIQ reg */ + /* r8 AT91C_BASE_AIC (dfu init) + r9 AT91C_TC_SWTRG + r10 AT91C_BASE_PIOA + r11 tmp + r12 AT91C_BASE_TC0 + r13 stack + r14 lr + */ + + ldr r8, [r10, #PIOA_ISR] + tst r8, #PIO_DATA /* check for PIO_DATA change */ + ldrne r11, [r10, #PIOA_PDSR] + tstne r11, #PIO_DATA /* check for PIO_DATA == 1 */ + strne r9, [r12, #TC_CCR] /* software trigger */ +#ifdef LED_TRIGGER + movne r11, #PIO_LED1 + strne r11, [r10, #PIOA_CODR] /* enable LED */ +#endif + +#if 1 + movne r11, #PIO_DATA + strne r11, [r10, #PIOA_IDR] /* disable further PIO_DATA FIQ */ +#endif + + /*- Mark the End of Interrupt on the AIC */ + ldr r11, =AT91C_BASE_AIC + str r11, [r11, #AIC_EOICR] + +#ifdef LED_TRIGGER + mov r11, #PIO_LED1 + str r11, [r10, #PIOA_SODR] /* disable LED */ +#endif + +#ifdef CALL_PIO_IRQ_DEMUX + /* push r0, r1-r3, r12, r14 onto FIQ stack */ + stmfd sp!, { r0-r3, r12, lr} + mov r0, r8 + + /* enable interrupts while handling demux */ + /* msr CPSR_c, #F_BIT | ARM_MODE_SVC */ + + /* Call C function, give PIOA_ISR as argument */ + ldr r11, =__pio_irq_demux + mov r14, pc + bx r11 + + /* msr CPSR_c, #I_BIT | F_BIT | ARM_MODE_FIQ */ + ldmia sp!, { r0-r3, r12, lr } +#endif + + /*- Restore the Program Counter using the LR_fiq directly in the PC */ + subs pc, lr, #4 + + .size fiq_handler, . - fiq_handler + .endfunc + .end + -- cgit v1.2.3