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/******************************************************************************
*
* Filename: spi_flash.c
*
* Instantiation of SPI flash control routines supporting AT45DB161B
*
* Revision information:
*
* 17JAN2005 kb_admin initial creation
* adapted from external sources
* tested for basic operation only!!!
*
* BEGIN_KBDD_BLOCK
* No warranty, expressed or implied, is included with this software. It is
* provided "AS IS" and no warranty of any kind including statutory or aspects
* relating to merchantability or fitness for any purpose is provided. All
* intellectual property rights of others is maintained with the respective
* owners. This software is not copyrighted and is intended for reference
* only.
* END_BLOCK
*
* $FreeBSD$
*****************************************************************************/
#include "at91rm9200.h"
#include "spi_flash.h"
#include "lib.h"
/*********************** PRIVATE FUNCTIONS/DATA ******************************/
static spiCommand_t spi_command;
static char tx_commandBuffer[8], rx_commandBuffer[8];
/*
* .KB_C_FN_DEFINITION_START
* void SendCommand(spiCommand_t *pCommand)
* Private function sends 8-bit value to the device and returns the 8-bit
* value in response.
* .KB_C_FN_DEFINITION_END
*/
static void
SendCommand(spiCommand_t *pCommand)
{
AT91PS_SPI pSPI = AT91C_BASE_SPI;
pSPI->SPI_PTCR = AT91C_PDC_TXTDIS | AT91C_PDC_RXTDIS;
pSPI->SPI_RPR = (unsigned)pCommand->rx_cmd;
pSPI->SPI_RCR = pCommand->rx_cmd_size;
pSPI->SPI_TPR = (unsigned)pCommand->tx_cmd;
pSPI->SPI_TCR = pCommand->tx_cmd_size;
pSPI->SPI_TNPR = (unsigned)pCommand->tx_data;
pSPI->SPI_TNCR = pCommand->tx_data_size;
pSPI->SPI_RNPR = (unsigned)pCommand->rx_data;
pSPI->SPI_RNCR = pCommand->rx_data_size;
pSPI->SPI_PTCR = AT91C_PDC_TXTEN | AT91C_PDC_RXTEN;
// wait for completion
while (!(pSPI->SPI_SR & AT91C_SPI_SPENDRX))
Delay(700);
}
/*
* .KB_C_FN_DEFINITION_START
* char GetFlashStatus(void)
* Private function to return device status.
* .KB_C_FN_DEFINITION_END
*/
static char
GetFlashStatus(void)
{
p_memset((char *)&spi_command, 0, sizeof(spi_command));
p_memset(tx_commandBuffer, 0, 8);
tx_commandBuffer[0] = STATUS_REGISTER_READ;
p_memset(rx_commandBuffer, 0, 8);
spi_command.tx_cmd = tx_commandBuffer;
spi_command.rx_cmd = rx_commandBuffer;
spi_command.rx_cmd_size = 2;
spi_command.tx_cmd_size = 2;
SendCommand(&spi_command);
return (rx_commandBuffer[1]);
}
/*
* .KB_C_FN_DEFINITION_START
* void WaitForDeviceReady(void)
* Private function to poll until the device is ready for next operation.
* .KB_C_FN_DEFINITION_END
*/
static void
WaitForDeviceReady(void)
{
while (!(GetFlashStatus() & 0x80)) ;
}
/*************************** GLOBAL FUNCTIONS ********************************/
/*
* .KB_C_FN_DEFINITION_START
* void SPI_ReadFlash(unsigned flash_addr, unsigned dest_addr, unsigned size)
* Global function to read the SPI flash device using the continuous read
* array command.
* .KB_C_FN_DEFINITION_END
*/
void
SPI_ReadFlash(unsigned flash_addr, char *dest_addr, unsigned size)
{
unsigned pageAddress, byteAddress;
// determine page address
pageAddress = flash_addr / FLASH_PAGE_SIZE;
// determine byte address
byteAddress = flash_addr % FLASH_PAGE_SIZE;
p_memset(tx_commandBuffer, 0, 8);
#ifdef BOOT_BWCT
tx_commandBuffer[0] = 0xd2;
tx_commandBuffer[1] = ((pageAddress >> 6) & 0xFF);
tx_commandBuffer[2] = ((pageAddress << 2) & 0xFC) |
((byteAddress >> 8) & 0x3);
tx_commandBuffer[3] = byteAddress & 0xFF;
spi_command.tx_cmd = tx_commandBuffer;
spi_command.tx_cmd_size = 8;
spi_command.tx_data_size = size;
spi_command.tx_data = dest_addr;
p_memset(rx_commandBuffer, 0, 8);
spi_command.rx_cmd = rx_commandBuffer;
spi_command.rx_cmd_size = 8;
spi_command.rx_data_size = size;
spi_command.rx_data = dest_addr;
#else
tx_commandBuffer[0] = CONTINUOUS_ARRAY_READ_HF;
tx_commandBuffer[1] = ((pageAddress >> 5) & 0xFF);
tx_commandBuffer[2] = ((pageAddress << 3) & 0xF8) |
((byteAddress >> 8) & 0x7);
tx_commandBuffer[3] = byteAddress & 0xFF;
spi_command.tx_cmd = tx_commandBuffer;
spi_command.tx_cmd_size = 5;
spi_command.tx_data_size = size;
spi_command.tx_data = dest_addr;
p_memset(rx_commandBuffer, 0, 8);
spi_command.rx_cmd = rx_commandBuffer;
spi_command.rx_cmd_size = 5;
spi_command.rx_data_size = size;
spi_command.rx_data = dest_addr;
#endif
SendCommand(&spi_command);
}
/*
* .KB_C_FN_DEFINITION_START
* void SPI_WriteFlash(unsigned flash_addr, unsigned src_addr, unsigned size)
* Global function to program the SPI flash device. Notice the warning
* provided in lower-level functions regarding corruption of data in non-
* page aligned write operations.
* .KB_C_FN_DEFINITION_END
*/
void
SPI_WriteFlash(unsigned flash_addr, char *src_addr, unsigned size)
{
unsigned pageAddress, byteAddress;
// determine page address
pageAddress = flash_addr / FLASH_PAGE_SIZE;
// determine byte address
byteAddress = flash_addr % FLASH_PAGE_SIZE;
p_memset(tx_commandBuffer, 0, 8);
#ifdef BOOT_BWCT
tx_commandBuffer[0] = 0x82;
tx_commandBuffer[1] = ((pageAddress >> 6) & 0xFF);
tx_commandBuffer[2] = ((pageAddress << 2) & 0xFC) |
((byteAddress >> 8) & 0x3);
tx_commandBuffer[3] = (byteAddress & 0xFF);
#else
tx_commandBuffer[0] = PROGRAM_THROUGH_BUFFER;
tx_commandBuffer[1] = ((pageAddress >> 5) & 0xFF);
tx_commandBuffer[2] = ((pageAddress << 3) & 0xF8) |
((byteAddress >> 8) & 0x7);
tx_commandBuffer[3] = (byteAddress & 0xFF);
#endif
p_memset(rx_commandBuffer, 0, 8);
spi_command.tx_cmd = tx_commandBuffer;
spi_command.rx_cmd = rx_commandBuffer;
spi_command.rx_cmd_size = 4;
spi_command.tx_cmd_size = 4;
spi_command.tx_data_size = size;
spi_command.tx_data = src_addr;
spi_command.rx_data_size = size;
spi_command.rx_data = src_addr;
SendCommand(&spi_command);
WaitForDeviceReady();
}
/*
* .KB_C_FN_DEFINITION_START
* void SPI_InitFlash(void)
* Global function to initialize the SPI flash device/accessor functions.
* .KB_C_FN_DEFINITION_END
*/
void
SPI_InitFlash(void)
{
AT91PS_PIO pPio;
AT91PS_SPI pSPI = AT91C_BASE_SPI;
unsigned value;
// enable CS0, CLK, MOSI, MISO
pPio = (AT91PS_PIO)AT91C_BASE_PIOA;
pPio->PIO_ASR = AT91C_PA3_NPCS0 | AT91C_PA1_MOSI | AT91C_PA0_MISO |
AT91C_PA2_SPCK;
pPio->PIO_PDR = AT91C_PA3_NPCS0 | AT91C_PA1_MOSI | AT91C_PA0_MISO |
AT91C_PA2_SPCK;
// enable clocks to SPI
AT91C_BASE_PMC->PMC_PCER = 1u << AT91C_ID_SPI;
// reset the SPI
pSPI->SPI_CR = AT91C_SPI_SWRST;
pSPI->SPI_MR = (0xf << 24) | AT91C_SPI_MSTR | AT91C_SPI_MODFDIS |
(0xE << 16);
pSPI->SPI_CSR[0] = AT91C_SPI_CPOL | (4 << 16) | (2 << 8);
pSPI->SPI_CR = AT91C_SPI_SPIEN;
pSPI->SPI_PTCR = AT91C_PDC_TXTDIS;
pSPI->SPI_PTCR = AT91C_PDC_RXTDIS;
pSPI->SPI_RNPR = 0;
pSPI->SPI_RNCR = 0;
pSPI->SPI_TNPR = 0;
pSPI->SPI_TNCR = 0;
pSPI->SPI_RPR = 0;
pSPI->SPI_RCR = 0;
pSPI->SPI_TPR = 0;
pSPI->SPI_TCR = 0;
pSPI->SPI_PTCR = AT91C_PDC_RXTEN;
pSPI->SPI_PTCR = AT91C_PDC_TXTEN;
value = pSPI->SPI_RDR;
value = pSPI->SPI_SR;
// Increment real time counter every SLCK
AT91C_BASE_ST->ST_RTMR = 1;
#ifdef BOOT_BWCT
if (((value = GetFlashStatus()) & 0xFC) != 0xB4)
printf(" Bad SPI status: 0x%x\n", value);
#else
if (((value = GetFlashStatus()) & 0xFC) != 0xBC)
printf(" Bad SPI status: 0x%x\n", value);
#endif
}
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