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