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//==========================================================================

//

//        prog_flash.c

//

//        ARM PID7 eval board FLASH program tool

//

//==========================================================================

// ####ECOSGPLCOPYRIGHTBEGIN####                                            

// -------------------------------------------                              

// This file is part of eCos, the Embedded Configurable Operating System.   

// Copyright (C) 1998, 1999, 2000, 2001, 2002 Free Software Foundation, Inc.

//

// eCos 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     

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// for more details.                                                        

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//

// As a special exception, if other files instantiate templates or use      

// macros or inline functions from this file, or you compile this file      

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// General Public License v2.                                               

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// on this file might be covered by the GNU General Public License.         

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// ####ECOSGPLCOPYRIGHTEND####                                              

//==========================================================================

//#####DESCRIPTIONBEGIN####

//

// Author(s):     gthomas

// Contributors:  gthomas

// Date:          1998-11-18

// Description:   Tool used to program onboard FLASH image

//####DESCRIPTIONEND####

//

// This program will program the FLASH on the PID board

// It is similar to 'flash' (which also downloads S records) but it always

// programs from a fixed buffer.  This is sufficient to load/update the GDB

// stubs on the board.

//

#include <pkgconf/libc.h>   // Configuration header

#include <cyg/kernel/kapi.h>

#include <stdlib.h>

#include <ctype.h>

#include <cyg/infra/testcase.h>

#include <sys/cstartup.h>

#ifndef FALSE

#define FALSE 0

#define TRUE  1

#endif

extern void diag_printf(const char *, ...);

int identify_FLASH(void);

void write_sector(int, char *);

char *flash_buffer =     (char *)0x60000;

char *flash_buffer_end = (char *)0x80000;

#ifdef BE_IMAGE

#define BUF(x) buf[x^3]

#else

#define BUF(x) buf[x]

#endif

// FUNCTIONS

externC void

cyg_package_start( void )

{

#ifdef CYGPKG_LIBC

    cyg_iso_c_start();

#else

    (void)main(0, NULL);

#endif

} // cyg_package_start()

int

main( int argc, char *argv[] )

{

    int i;

    diag_printf("FLASH here!\n");

    while (identify_FLASH() == 0) {

        diag_printf("... Please change FLASH jumper\n");

        cyg_thread_delay(5*100);

    }

    diag_printf("About to program FLASH using data at %x..%x\n", flash_buffer, flash_buffer_end);

    diag_printf("*** Press RESET now to abort!\n");

    cyg_thread_delay(5*100);

    diag_printf("\n");

    diag_printf("...Programming FLASH\n");

    i = 0;

    while (flash_buffer < flash_buffer_end) {

        write_sector(i++, flash_buffer);

        flash_buffer += 256;

    }

    diag_printf("All done!\n");

    while (1) ;

}

// Adapted from ARM sample code

#define SEQ_ADD1                0x5555

#define SEQ_ADD2                0xAAAA

#define START_CMD1              0xAA

#define START_CMD2              0x55

#define ID_CMD                  0x90

#define PROG_CMD                0xA0

#define STOP_CMD                0xF0

#define MAN_ATMEL               0x1F

#define ATMEL_AT29C040_ID       0X5B

#define ATMEL_AT29C040A_ID      0XA4

#define ATMEL_AT29C1024_ID      0X25

#define ATMEL_SECTOR_SIZE       256

#define ATMEL_MAX_SECTORS       2048

int manuf_code, device_code, sector_size, max_no_of_sectors, word_mode;

volatile char *FLASH = (volatile char *)0x04000000;

int

identify_FLASH(void )

{

    // Enter Software Product Identification Mode

    FLASH[SEQ_ADD1] = START_CMD1;

    FLASH[SEQ_ADD2] = START_CMD2;

    FLASH[SEQ_ADD1] = ID_CMD;

    // Wait at least 10ms

    cyg_thread_delay(2);

    // Read Manufacturer and device code from the device

    manuf_code = FLASH[0];

    device_code = FLASH[1];

    diag_printf("manuf: %x, device: %x\n", manuf_code, device_code);

    // Exit Software Product Identification Mode

    FLASH[SEQ_ADD1] = START_CMD1;

    FLASH[SEQ_ADD2] = START_CMD2;

    FLASH[SEQ_ADD1] = STOP_CMD;

    // Wait at least 10ms

    cyg_thread_delay(5);

    if (manuf_code != MAN_ATMEL) {

        diag_printf ( "Error: Wrong Manufaturer: %02x\n",manuf_code );

        return (0);

    }

    switch (device_code) {

    case  ATMEL_AT29C040A_ID:

        diag_printf ("AT29C040A recognised\n");

        sector_size = ATMEL_SECTOR_SIZE;

        max_no_of_sectors = ATMEL_MAX_SECTORS;

        word_mode = FALSE;

        break;

    case  ATMEL_AT29C1024_ID:

        diag_printf ("AT29C1024 recognised\n");

        sector_size = ATMEL_SECTOR_SIZE;

        max_no_of_sectors = ATMEL_MAX_SECTORS;

        word_mode = TRUE;

        break;

    default :

        diag_printf ( "Error: Unsupported device: %02x\n", device_code);

        return (0);

    }

    return (1);

}

void

write_sector(int num, char *buf)

{

    int i, cnt;

    volatile char *wrt = (volatile char *)&FLASH[num*sector_size];

//    diag_printf("Writing to %08x\n", wrt);

    // Enter Program Mode

    FLASH[SEQ_ADD1] = START_CMD1;

    FLASH[SEQ_ADD2] = START_CMD2;

    FLASH[SEQ_ADD1] = PROG_CMD;

    // Note: write bytes as longs regardless of bus width

    for (i = 0;  i < sector_size;  i++) {

        wrt[i] = BUF(i);

    }

    // Wait for sector to program

    cnt = 0;

    i = sector_size - 1;

    while (wrt[i] != BUF(i)) {

        if (cnt++ > 0x01000000) break;

    }

//    diag_printf("Out - i: %d, wrt[i] = %08X.%08X, BUF(i) = %08X, count = %x\n", i, &wrt[i], wrt[i], BUF(i), cnt);

    // Verify

    for (i = 0;  i < sector_size;  i++) {

        for (cnt = 0;  cnt < 10;  cnt++) {

            if (wrt[i] == BUF(i)) break;

            cyg_thread_delay(1);

        }

        if (cnt == 10) {

            diag_printf("Can't program at 0x%08X: %02X not %02X\n", wrt, *wrt, BUF(0));

        }

    }

}