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/*
* Copyright 2007 b7 Spectrum Digital Incorporated.
* All rights reserved. Property of Spectrum Digital Incorporated.
*/
/*
* SPI ROM interface
*
*/
#include "spirom.h"
static Uint8 spirombuf[SPIROM_PAGESIZE + 5];
static Uint8 statusbuf[8];
static Uint32 spidat1;
/* ------------------------------------------------------------------------ *
* *
* _wait( delay ) *
* Wait in a software loop for 'x' delay *
* *
* ------------------------------------------------------------------------ */
void DAVINCIHD_wait( Uint32 delay )
{
volatile Uint32 i;
for ( i = 0 ; i < delay ; i++ ){ };
}
/* ------------------------------------------------------------------------ *
* spirom_init( ) *
* ------------------------------------------------------------------------ */
void spirom_init( )
{
/* Reset SPI */
SPI_SPIGCR0 = 0;
_wait( 1000 );
/* Release SPI */
SPI_SPIGCR0 = 1;
/* SPI 4-Pin Mode setup */
SPI_SPIGCR1 = 0
| ( 0 << 24 )
| ( 0 << 16 )
| ( 1 << 1 )
| ( 1 << 0 );
SPI_SPIPC0 = 0
| ( 1 << 11 ) // DI
| ( 1 << 10 ) // DO
| ( 1 << 9 ) // CLK
| ( 1 << 1 ) // EN1
| ( 1 << 0 ); // EN0
SPI_SPIFMT0 = 0
| ( 0 << 20 ) // SHIFTDIR
| ( 0 << 17 ) // Polarity
| ( 1 << 16 ) // Phase
| ( 50 << 8 ) // Prescale
| ( 8 << 0 ); // Char Len
spidat1 = 0
| ( 1 << 28 ) // CSHOLD
| ( 0 << 24 ) // Format [0]
| ( 2 << 16 ) // CSNR [only CS0 enbled]
| ( 0 << 0 ); //
SPI_SPIDAT1 = spidat1;
SPI_SPIDELAY = 0
| ( 8 << 24 ) // C2TDELAY
| ( 8 << 16 ); // T2CDELAY
SPI_SPIDEF = 0
| ( 1 << 1 ) // EN1 inactive high
| ( 1 << 0 ); // EN0 inactive high
SPI_SPIINT = 0
| ( 0 << 16 ) //
| ( 0 << 8 ) //
| ( 0 << 6 ) //
| ( 1 << 4 ); //
SPI_SPILVL = 0
| ( 0 << 8 ) // EN0
| ( 0 << 6 ) // EN0
| ( 0 << 4 ); // EN0
/* Enable SPI */
SPI_SPIGCR1 |= ( 1 << 24 );
}
/* ------------------------------------------------------------------------ *
* spirom_cycle( buf, len ) *
* *
* Execute a SPI spirom data transfer cycle. Each byte in buf is shifted *
* out and replaced with data coming back from the spirom. *
* ------------------------------------------------------------------------ */
void spirom_cycle( Uint8 *buf, Uint16 len )
{
Uint16 i;
/* Clear any old data */
SPI_SPIBUF;
/* SPIROM access cycle */
for ( i = 0 ; i <= len ; i++ )
{
/* Wait for transmit ready */
while ( SPI_SPIBUF & 0x10000000 );
if ( i == len )
SPI_SPIDAT1 = ( spidat1 & 0x0ffcffff ) | buf[i];
else
SPI_SPIDAT1 = spidat1 | buf[i];
/* Wait for receive data ready */
while ( SPI_SPIBUF & 0x80000000 );
/* Read 1 byte */
buf[i] = SPI_SPIBUF;
}
}
/* ------------------------------------------------------------------------ *
* spirom_status( ) *
* ------------------------------------------------------------------------ */
Uint8 spirom_status( )
{
/* Issue read status command */
statusbuf[0] = SPIROM_CMD_RDSR;
statusbuf[1] = 0;
spirom_cycle( statusbuf, 2 );
return statusbuf[1];
}
/* ------------------------------------------------------------------------ *
* spirom_read( src, dst, length ) *
* ------------------------------------------------------------------------ */
void spirom_read( Uint16 src, Uint32 dst, Uint32 length )
{
Int32 i;
Uint8 *psrc, *pdst;
// Setup command
spirombuf[0] = SPIROM_CMD_READ;
spirombuf[1] = ( src >> 8 );
spirombuf[2] = ( src >> 0 );
// Execute spirom read cycle
spirom_cycle( spirombuf, length + 3 );
// Copy returned data
pdst = ( Uint8 * )dst;
psrc = spirombuf + 3;
for ( i = 0 ; i < length ; i++ )
*pdst++ = *psrc++;
}
/* ------------------------------------------------------------------------ *
* spirom_write( src, dst, length ) *
* ------------------------------------------------------------------------ */
void spirom_write( Uint32 src, Uint16 dst, Uint32 length )
{
Int32 i;
Int32 bytes_left;
Int32 bytes_to_program;
Uint8 *psrc;
/* Establish source */
psrc = ( Uint8 * )src;
bytes_left = length;
while ( bytes_left > 0 )
{
bytes_to_program = bytes_left;
/* Most to program is SPIROM_CMD_BLOCKSIZE */
if ( bytes_to_program > SPIROM_PAGESIZE )
bytes_to_program = SPIROM_PAGESIZE;
/* Make sure you don't run off the end of a block */
if ( ( dst & SPIROM_PAGEMASK ) != ( ( dst + bytes_to_program ) & SPIROM_PAGEMASK ) )
bytes_to_program -= ( dst + bytes_to_program ) - ( ( dst + bytes_to_program ) & SPIROM_PAGEMASK );
/* Issue WPEN */
spirombuf[0] = SPIROM_CMD_WREN;
spirom_cycle( spirombuf, 0 );
/* Create command block for program operation */
spirombuf[0] = SPIROM_CMD_WRITE;
spirombuf[1] = ( Uint8 )( dst >> 8 );
spirombuf[2] = ( Uint8 )( dst );
for ( i = 0 ; i < bytes_to_program ; i++ )
spirombuf[3+i] = *psrc++;
/* Execute write command */
spirom_cycle( spirombuf, bytes_to_program + 2 );
/* Wait while busy */
while( ( spirom_status( ) & 0x01 ) );
/* Get ready for next iteration */
bytes_left -= bytes_to_program;
dst += bytes_to_program;
}
}
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