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

//

//        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     

// Software Foundation; either version 2 or (at your option) any later      

// version.                                                                 

//

// eCos 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 eCos; if not, write to the Free Software Foundation, Inc.,    

// 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.            

//

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

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

// and link it with other works to produce a work based on this file,       

// this file does not by itself cause the resulting work to be covered by   

// the GNU General Public License. However the source code for this file    

// must still be made available in accordance with section (3) of the GNU   

// General Public License v2.                                               

//

// This exception does not invalidate any other reasons why a work based    

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

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

// ####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

//

#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

#define SYNC_COUNT 63

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

int identify_FLASH(void);

void write_sector(int, char *);

bool load_srecords(char (*readc)(), CYG_ADDRESS *start, int *size);

char dbuf[256];

char *raw = (char *)0x10000;

char *flash_buffer = (char *)0x30000;

int pos, len;

// FUNCTIONS

externC void

cyg_package_start( void )

{

#ifdef CYGPKG_LIBC

    cyg_iso_c_start();

#else

    (void)main(0, NULL);

#endif

} // cyg_package_start()

char nextch(void)

{

    return (raw[pos++]);

}

int

main( int argc, char *argv[] )

{

    int i, j, size;

    CYG_ADDRESS entry;

    char c;

    diag_printf("FLASH here!\n");

    while (identify_FLASH() == 0) {

        diag_printf("... Please change FLASH jumper - hit C/R to continue:");

        do {

            hal_diag_read_char(&c);

        } while ((c != '\r') && (c != '\n'));

        diag_printf("\n");

    }

 restart:

    diag_printf("Ready file - hit C/R to continue:");

    while (TRUE) {

        hal_diag_read_char(&c);

        if (c == '>') break;

    }

    i = 0;  j = 0;

    while (1) {

        hal_diag_read_char(&c);

        if (c == '!') {

            diag_printf("... Reset\n");

            goto restart;

        }

        raw[i++] = c;

        if (++j == SYNC_COUNT) {

            hal_diag_write_char(c);

            j = 0;

        }

        if (c == ':') break;

    }

    diag_printf("\n");

    pos = 0;  len = i;

    if (load_srecords(nextch, &entry, &size)) {

        diag_printf("Read %x bytes, entry: %x\n", size, entry);

        dump_buf(flash_buffer, 128);

        diag_printf("\nData loaded - hit '!' to continue:");

        while (TRUE) {

            hal_diag_read_char(&c);

            if (c == '!') break;

        }

        diag_printf("\n");

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

        pos = 0;  i = 0;

        while (pos < size) {

            write_sector(i++, flash_buffer+pos);

            pos += 256;

        }

    } else {

        // Display buffer around failure        

        dump_buf(&raw[pos-32], 64);

    }

    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 int *)&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 == *buf) break;

            cyg_thread_delay(1);

        }

        if (cnt == 10) {

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

        }

        wrt++;  buf++;

    }

}

// S-record download code - viciously 'adapted' from "kernel/src/sload/sload.c"

/*---------------------------------------------------------------------------*/

/*

//

//      An srecord looks like this:

//

// byte count-+     address

// start ---+ |        |       data        +- checksum

//          | |        |                   |

//        S01000006F6B692D746573742E73726563E4

//        S315000448600000000000000000FC00005900000000E9

//        S31A0004000023C1400037DE00F023604000377B009020825000348D

//        S30B0004485A0000000000004E

//        S70500040000F6

//

//      S<type><length><address><data><checksum>

//

//      Where

//      - length (2 characters)

//        is the number of bytes following upto the checksum. Note that

//        this is not the number of chars following, since it takes two

//        chars to represent a byte.

//      - type (2 characters)

//        is one of:

//        0) header record

//        1) two byte address data record

//        2) three byte address data record

//        3) four byte address data record

//        5) record containing the number of S1, S2, or S3 records

//        7) four byte address termination record

//        8) three byte address termination record

//        9) two byte address termination record

//

//      - address (4, 6, or 8 characters)

//        is the start address of the data following, or in the case of

//        a termination record, the start address of the image

//      - data (0-2n characters)

//        is the data.

//      - checksum (2 characters)

//        is the sum of all the raw byte data in the record, from the length

//        upwards, modulo 256 and subtracted from 255.

//

// Useful S-records for testing purposes:

//   Start record:

//      S00B0000737461303030447563

//   This sets the default address to be 0x02005000:

//      S31A020050002700801481C4E0B0A15000000100000091D02000018F

//      S31A0200501500000001000000010000002700801881C4E2E4A150C1

//      S311020080A42407070A090B0A0781050000E1

//   Termination record:

//      S70502005000A8

//

*/

#define S0      0

#define S1      1

#define S2      2

#define S3      3

#define S5      5

#define S7      7

#define S8      8

#define S9      9

/*---------------------------------------------------------------------------*/

int hex2digit(char c)

{

    if( c & 0x40 ) c += 9;;

    return c &0x0f;

//    return ( c <= '9' ? c - '0' :

//             c <= 'Z' ? c - 'A' + 10 :

//             c - 'a' + 10);

}

/*---------------------------------------------------------------------------*/

bool load_srecords(char (*readc)(),

                   CYG_ADDRESS *start,

                   int *size)

{

    CYG_ADDRESS addr, load_addr;

    int addrsize;

    int length;

    int i;

    cyg_uint8 chksum, ochksum;

    cyg_uint8 val;

    cyg_uint8 *tdata;

    char s;

    char type;

    char len0;

    char len1;

    bool first = true;

    do {

        // Skip whitespace characters until we find something that

        // might be an 'S'.

        do {

            s = readc();

        } while( s == '\r' || s == '\n' || s == ' ');

        // Check that this is an S record

        if( s != 'S' ) {

            diag_printf("Invalid 'S' record\n");

            return false;

        }

        // First 4 bytes are standard S + type + len

        type = readc();

        len0 = readc();

        len1 = readc();

        // decode the type

        type = hex2digit(type);

        // determine address size

        switch (type) {

        case S0:                        // start records have no address

            addrsize = 0;

            break;

        case S1:                        // two byte address

        case S9:

            addrsize = 4;

            break;

        case S2:                        // 3 byte address

        case S8:

            addrsize = 6;

            break;

        case S3:                        // 4 byte address

        case S7:

            addrsize = 8;

            break;

        }

        length  = hex2digit (len0) << 4;

        length |= hex2digit (len1);

        chksum = length;

        // read the address

        addr = 0;

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

            val = hex2digit(readc());

            addr = (addr << 4) | val;

        }

        // calculate the checksum, which is done by the byte, not the digit

        for (i = 0; i < addrsize*4; i += 8) {

            chksum += ((addr >>  i) & 0xff);

        }

        // decide where to load this data

        if (first && (type != S0)) {

            load_addr = addr;

            first = false;

        }

        // read the data and put it directly into memory where it belongs

        tdata = (cyg_uint8 *)((addr - load_addr) + flash_buffer);

        if (type < S7) {

            *size = (addr - load_addr);

        }

        val = 0;

        for (i = 0; i < ((length - 1) * 2) - addrsize; i += 2 ) {

            val  = hex2digit (readc()) << 4;

            val |= hex2digit (readc());

            chksum += val;

            if( type != S0 ) *tdata++ = val;

            if (type < S7) *size = *size + 1;

        }

        // now get the old checksum

        ochksum = hex2digit(readc()) << 4;

        ochksum |= hex2digit(readc());

        chksum = ~chksum;

        if (chksum != ochksum) {

            diag_printf("Bad checksum - addr: %x\n", addr);

            return false;

        }

    } while( type < S7 );

    *start = addr;

    return true;

}