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-rw-r--r--drivers/at45.c550
1 files changed, 550 insertions, 0 deletions
diff --git a/drivers/at45.c b/drivers/at45.c
new file mode 100644
index 0000000..35c9ecc
--- /dev/null
+++ b/drivers/at45.c
@@ -0,0 +1,550 @@
+/* Driver for ATMEL DataFlash support
+ * Author : Hamid Ikdoumi (Atmel)
+ *
+ * This program 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 of
+ * the License, or (at your option) any later version.
+ *
+ * This program 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 this program; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place, Suite 330, Boston,
+ * MA 02111-1307 USA
+ *
+ */
+
+#include <config.h>
+#include <common.h>
+
+#ifdef CONFIG_HAS_DATAFLASH
+#include <dataflash.h>
+
+
+#define AT91C_TIMEOUT_WRDY 200000
+
+
+/*----------------------------------------------------------------------*/
+/* \fn AT91F_DataFlashSendCommand */
+/* \brief Generic function to send a command to the dataflash */
+/*----------------------------------------------------------------------*/
+AT91S_DataFlashStatus AT91F_DataFlashSendCommand(
+ AT91PS_DataFlash pDataFlash,
+ unsigned char OpCode,
+ unsigned int CmdSize,
+ unsigned int DataflashAddress)
+{
+ unsigned int adr;
+
+ if ( (pDataFlash->pDataFlashDesc->state) != IDLE)
+ return DATAFLASH_BUSY;
+
+ /* process the address to obtain page address and byte address */
+ adr = ((DataflashAddress / (pDataFlash->pDevice->pages_size)) <<
+ pDataFlash->pDevice->page_offset) + (DataflashAddress %
+ (pDataFlash->pDevice->pages_size));
+
+ /* fill the command buffer */
+ pDataFlash->pDataFlashDesc->command[0] = OpCode;
+ if (pDataFlash->pDevice->pages_number >= 16384) {
+ pDataFlash->pDataFlashDesc->command[1] =
+ (unsigned char)((adr & 0x0F000000) >> 24);
+ pDataFlash->pDataFlashDesc->command[2] =
+ (unsigned char)((adr & 0x00FF0000) >> 16);
+ pDataFlash->pDataFlashDesc->command[3] =
+ (unsigned char)((adr & 0x0000FF00) >> 8);
+ pDataFlash->pDataFlashDesc->command[4] =
+ (unsigned char)(adr & 0x000000FF);
+ } else {
+ pDataFlash->pDataFlashDesc->command[1] =
+ (unsigned char)((adr & 0x00FF0000) >> 16);
+ pDataFlash->pDataFlashDesc->command[2] =
+ (unsigned char)((adr & 0x0000FF00) >> 8);
+ pDataFlash->pDataFlashDesc->command[3] =
+ (unsigned char)(adr & 0x000000FF);
+ pDataFlash->pDataFlashDesc->command[4] = 0;
+ }
+ pDataFlash->pDataFlashDesc->command[5] = 0;
+ pDataFlash->pDataFlashDesc->command[6] = 0;
+ pDataFlash->pDataFlashDesc->command[7] = 0;
+
+ /* Initialize the SpiData structure for the spi write fuction */
+ pDataFlash->pDataFlashDesc->tx_cmd_pt =
+ pDataFlash->pDataFlashDesc->command;
+ pDataFlash->pDataFlashDesc->tx_cmd_size = CmdSize;
+ pDataFlash->pDataFlashDesc->rx_cmd_pt =
+ pDataFlash->pDataFlashDesc->command;
+ pDataFlash->pDataFlashDesc->rx_cmd_size = CmdSize;
+
+ /* send the command and read the data */
+ return AT91F_SpiWrite (pDataFlash->pDataFlashDesc); }
+
+
+/*----------------------------------------------------------------------*/
+/* \fn AT91F_DataFlashGetStatus */
+/* \brief Read the status register of the dataflash */
+/*----------------------------------------------------------------------*/
+AT91S_DataFlashStatus AT91F_DataFlashGetStatus(AT91PS_DataflashDesc pDesc)
+{
+ AT91S_DataFlashStatus status;
+
+ /* if a transfert is in progress ==> return 0 */
+ if( (pDesc->state) != IDLE)
+ return DATAFLASH_BUSY;
+
+ /* first send the read status command (D7H) */
+ pDesc->command[0] = DB_STATUS;
+ pDesc->command[1] = 0;
+
+ pDesc->DataFlash_state = GET_STATUS;
+ pDesc->tx_data_size = 0; /* Transmit the command */
+ /* and receive response */
+ pDesc->tx_cmd_pt = pDesc->command;
+ pDesc->rx_cmd_pt = pDesc->command;
+ pDesc->rx_cmd_size = 2;
+ pDesc->tx_cmd_size = 2;
+ status = AT91F_SpiWrite (pDesc);
+
+ pDesc->DataFlash_state = *( (unsigned char *) (pDesc->rx_cmd_pt) +1);
+
+ return status;
+}
+
+
+/*----------------------------------------------------------------------*/
+/* \fn AT91F_DataFlashWaitReady */
+/* \brief wait for dataflash ready (bit7 of the status register == 1) */
+/*----------------------------------------------------------------------*/
+AT91S_DataFlashStatus AT91F_DataFlashWaitReady(AT91PS_DataflashDesc
+pDataFlashDesc, unsigned int timeout)
+{
+ pDataFlashDesc->DataFlash_state = IDLE;
+
+ do {
+ AT91F_DataFlashGetStatus(pDataFlashDesc);
+ timeout--;
+ } while( ((pDataFlashDesc->DataFlash_state & 0x80) != 0x80) &&
+ (timeout > 0) );
+
+ if((pDataFlashDesc->DataFlash_state & 0x80) != 0x80)
+ return DATAFLASH_ERROR;
+
+ return DATAFLASH_OK;
+}
+
+
+/*--------------------------------------------------------------------------*/
+/* Function Name : AT91F_DataFlashContinuousRead */
+/* Object : Continuous stream Read */
+/* Input Parameters : DataFlash Service */
+/* : <src> = dataflash address */
+/* : <*dataBuffer> = data buffer pointer */
+/* : <sizeToRead> = data buffer size */
+/* Return value : State of the dataflash */
+/*--------------------------------------------------------------------------*/
+AT91S_DataFlashStatus AT91F_DataFlashContinuousRead (
+ AT91PS_DataFlash pDataFlash,
+ int src,
+ unsigned char *dataBuffer,
+ int sizeToRead )
+{
+ AT91S_DataFlashStatus status;
+ /* Test the size to read in the device */
+ if ( (src + sizeToRead) >
+ (pDataFlash->pDevice->pages_size *
+ (pDataFlash->pDevice->pages_number)))
+ return DATAFLASH_MEMORY_OVERFLOW;
+
+ pDataFlash->pDataFlashDesc->rx_data_pt = dataBuffer;
+ pDataFlash->pDataFlashDesc->rx_data_size = sizeToRead;
+ pDataFlash->pDataFlashDesc->tx_data_pt = dataBuffer;
+ pDataFlash->pDataFlashDesc->tx_data_size = sizeToRead;
+
+ status = AT91F_DataFlashSendCommand
+ (pDataFlash, DB_CONTINUOUS_ARRAY_READ, 8, src);
+ /* Send the command to the dataflash */
+ return(status);
+}
+
+
+/*---------------------------------------------------------------------------*/
+/* Function Name : AT91F_DataFlashPagePgmBuf */
+/* Object : Main memory page program thru buffer 1 or buffer 2 */
+/* Input Parameters : DataFlash Service */
+/* : <*src> = Source buffer */
+/* : <dest> = dataflash destination address */
+/* : <SizeToWrite> = data buffer size */
+/* Return value : State of the dataflash */
+/*---------------------------------------------------------------------------*/
+AT91S_DataFlashStatus AT91F_DataFlashPagePgmBuf(
+ AT91PS_DataFlash pDataFlash,
+ unsigned char *src,
+ unsigned int dest,
+ unsigned int SizeToWrite)
+{
+ int cmdsize;
+ pDataFlash->pDataFlashDesc->tx_data_pt = src;
+ pDataFlash->pDataFlashDesc->tx_data_size = SizeToWrite;
+ pDataFlash->pDataFlashDesc->rx_data_pt = src;
+ pDataFlash->pDataFlashDesc->rx_data_size = SizeToWrite;
+
+ cmdsize = 4;
+ /* Send the command to the dataflash */
+ if (pDataFlash->pDevice->pages_number >= 16384)
+ cmdsize = 5;
+ return(AT91F_DataFlashSendCommand (pDataFlash, DB_PAGE_PGM_BUF1,
+cmdsize, dest)); }
+
+
+/*---------------------------------------------------------------------------*/
+/* Function Name : AT91F_MainMemoryToBufferTransfert */
+/* Object : Read a page in the SRAM Buffer 1 or 2 */
+/* Input Parameters : DataFlash Service */
+/* : Page concerned */
+/* : */
+/* Return value : State of the dataflash */
+/*---------------------------------------------------------------------------*/
+AT91S_DataFlashStatus AT91F_MainMemoryToBufferTransfert(
+ AT91PS_DataFlash pDataFlash,
+ unsigned char BufferCommand,
+ unsigned int page)
+{
+ int cmdsize;
+ /* Test if the buffer command is legal */
+ if ((BufferCommand != DB_PAGE_2_BUF1_TRF)
+ && (BufferCommand != DB_PAGE_2_BUF2_TRF))
+ return DATAFLASH_BAD_COMMAND;
+
+ /* no data to transmit or receive */
+ pDataFlash->pDataFlashDesc->tx_data_size = 0;
+ cmdsize = 4;
+ if (pDataFlash->pDevice->pages_number >= 16384)
+ cmdsize = 5;
+ return(AT91F_DataFlashSendCommand (pDataFlash, BufferCommand, cmdsize,
+page*pDataFlash->pDevice->pages_size));
+}
+
+
+/*-------------------------------------------------------------------------- */
+/* Function Name : AT91F_DataFlashWriteBuffer */
+/* Object : Write data to the internal sram buffer 1 or 2 */
+/* Input Parameters : DataFlash Service */
+/* : <BufferCommand> = command to write buffer1 or 2 */
+/* : <*dataBuffer> = data buffer to write */
+/* : <bufferAddress> = address in the internal buffer */
+/* : <SizeToWrite> = data buffer size */
+/* Return value : State of the dataflash */
+/*---------------------------------------------------------------------------*/
+AT91S_DataFlashStatus AT91F_DataFlashWriteBuffer (
+ AT91PS_DataFlash pDataFlash,
+ unsigned char BufferCommand,
+ unsigned char *dataBuffer,
+ unsigned int bufferAddress,
+ int SizeToWrite )
+{
+ int cmdsize;
+ /* Test if the buffer command is legal */
+ if ((BufferCommand != DB_BUF1_WRITE)
+ && (BufferCommand != DB_BUF2_WRITE))
+ return DATAFLASH_BAD_COMMAND;
+
+ /* buffer address must be lower than page size */
+ if (bufferAddress > pDataFlash->pDevice->pages_size)
+ return DATAFLASH_BAD_ADDRESS;
+
+ if ( (pDataFlash->pDataFlashDesc->state) != IDLE)
+ return DATAFLASH_BUSY;
+
+ /* Send first Write Command */
+ pDataFlash->pDataFlashDesc->command[0] = BufferCommand;
+ pDataFlash->pDataFlashDesc->command[1] = 0;
+ if (pDataFlash->pDevice->pages_number >= 16384) {
+ pDataFlash->pDataFlashDesc->command[2] = 0;
+ pDataFlash->pDataFlashDesc->command[3] =
+ (unsigned char)(((unsigned int)(bufferAddress &
+ pDataFlash->pDevice->byte_mask)) >> 8);
+ pDataFlash->pDataFlashDesc->command[4] =
+ (unsigned char)((unsigned int)bufferAddress & 0x00FF);
+ cmdsize = 5;
+ } else {
+ pDataFlash->pDataFlashDesc->command[2] =
+ (unsigned char)(((unsigned int)(bufferAddress &
+ pDataFlash->pDevice->byte_mask)) >> 8);
+ pDataFlash->pDataFlashDesc->command[3] =
+ (unsigned char)((unsigned int)bufferAddress & 0x00FF);
+ pDataFlash->pDataFlashDesc->command[4] = 0;
+ cmdsize = 4;
+ }
+
+ pDataFlash->pDataFlashDesc->tx_cmd_pt =
+ pDataFlash->pDataFlashDesc->command;
+ pDataFlash->pDataFlashDesc->tx_cmd_size = cmdsize;
+ pDataFlash->pDataFlashDesc->rx_cmd_pt =
+ pDataFlash->pDataFlashDesc->command;
+ pDataFlash->pDataFlashDesc->rx_cmd_size = cmdsize;
+
+ pDataFlash->pDataFlashDesc->rx_data_pt = dataBuffer;
+ pDataFlash->pDataFlashDesc->tx_data_pt = dataBuffer;
+ pDataFlash->pDataFlashDesc->rx_data_size = SizeToWrite;
+ pDataFlash->pDataFlashDesc->tx_data_size = SizeToWrite;
+
+ return AT91F_SpiWrite(pDataFlash->pDataFlashDesc);
+}
+
+/*---------------------------------------------------------------------------*/
+/* Function Name : AT91F_PageErase */
+/* Object : Erase a page */
+/* Input Parameters : DataFlash Service */
+/* : Page concerned */
+/* : */
+/* Return value : State of the dataflash */
+/*---------------------------------------------------------------------------*/
+AT91S_DataFlashStatus AT91F_PageErase(
+ AT91PS_DataFlash pDataFlash,
+ unsigned int page)
+{
+ int cmdsize;
+ /* Test if the buffer command is legal */
+ /* no data to transmit or receive */
+ pDataFlash->pDataFlashDesc->tx_data_size = 0;
+
+ cmdsize = 4;
+ if (pDataFlash->pDevice->pages_number >= 16384)
+ cmdsize = 5;
+ return(AT91F_DataFlashSendCommand (pDataFlash, DB_PAGE_ERASE, cmdsize,
+page*pDataFlash->pDevice->pages_size));
+}
+
+
+/*---------------------------------------------------------------------------*/
+/* Function Name : AT91F_BlockErase */
+/* Object : Erase a Block */
+/* Input Parameters : DataFlash Service */
+/* : Page concerned */
+/* : */
+/* Return value : State of the dataflash */
+/*---------------------------------------------------------------------------*/
+AT91S_DataFlashStatus AT91F_BlockErase(
+ AT91PS_DataFlash pDataFlash,
+ unsigned int block)
+{
+ int cmdsize;
+ /* Test if the buffer command is legal */
+ /* no data to transmit or receive */
+ pDataFlash->pDataFlashDesc->tx_data_size = 0;
+ cmdsize = 4;
+ if (pDataFlash->pDevice->pages_number >= 16384)
+ cmdsize = 5;
+ return(AT91F_DataFlashSendCommand (pDataFlash, DB_BLOCK_ERASE,cmdsize,
+block*8*pDataFlash->pDevice->pages_size));
+}
+
+/*---------------------------------------------------------------------------*/
+/* Function Name : AT91F_WriteBufferToMain */
+/* Object : Write buffer to the main memory */
+/* Input Parameters : DataFlash Service */
+/* : <BufferCommand> = command to send to buffer1 or buffer2 */
+/* : <dest> = main memory address */
+/* Return value : State of the dataflash */
+/*---------------------------------------------------------------------------*/
+AT91S_DataFlashStatus AT91F_WriteBufferToMain (
+ AT91PS_DataFlash pDataFlash,
+ unsigned char BufferCommand,
+ unsigned int dest )
+{
+ int cmdsize;
+ /* Test if the buffer command is correct */
+ if ((BufferCommand != DB_BUF1_PAGE_PGM) &&
+ (BufferCommand != DB_BUF1_PAGE_ERASE_PGM) &&
+ (BufferCommand != DB_BUF2_PAGE_PGM) &&
+ (BufferCommand != DB_BUF2_PAGE_ERASE_PGM) )
+ return DATAFLASH_BAD_COMMAND;
+
+ /* no data to transmit or receive */
+ pDataFlash->pDataFlashDesc->tx_data_size = 0;
+
+ cmdsize = 4;
+ if (pDataFlash->pDevice->pages_number >= 16384)
+ cmdsize = 5;
+ /* Send the command to the dataflash */
+ return(AT91F_DataFlashSendCommand (pDataFlash, BufferCommand, cmdsize,
+ dest)); }
+
+
+/*---------------------------------------------------------------------------*/
+/* Function Name : AT91F_PartialPageWrite */
+/* Object : Erase partielly a page */
+/* Input Parameters : <page> = page number */
+/* : <AdrInpage> = adr to begin the fading */
+/* : <length> = Number of bytes to erase */
+/*---------------------------------------------------------------------------*/
+AT91S_DataFlashStatus AT91F_PartialPageWrite (
+ AT91PS_DataFlash pDataFlash,
+ unsigned char *src,
+ unsigned int dest,
+ unsigned int size)
+{
+ unsigned int page;
+ unsigned int AdrInPage;
+
+ page = dest / (pDataFlash->pDevice->pages_size);
+ AdrInPage = dest % (pDataFlash->pDevice->pages_size);
+
+ /* Read the contents of the page in the Sram Buffer */
+ AT91F_MainMemoryToBufferTransfert(pDataFlash,
+ DB_PAGE_2_BUF1_TRF, page);
+ AT91F_DataFlashWaitReady(pDataFlash->pDataFlashDesc,
+ AT91C_TIMEOUT_WRDY);
+ /*Update the SRAM buffer */
+ AT91F_DataFlashWriteBuffer(pDataFlash, DB_BUF1_WRITE, src,
+ AdrInPage, size);
+
+ AT91F_DataFlashWaitReady(pDataFlash->pDataFlashDesc,
+ AT91C_TIMEOUT_WRDY);
+
+ /* Erase page if a 128 Mbits device */
+ if (pDataFlash->pDevice->pages_number >= 16384) {
+ AT91F_PageErase(pDataFlash, page);
+ /* Rewrite the modified Sram Buffer in the main memory */
+ AT91F_DataFlashWaitReady(pDataFlash->pDataFlashDesc,
+ AT91C_TIMEOUT_WRDY);
+ }
+
+ /* Rewrite the modified Sram Buffer in the main memory */
+ return(AT91F_WriteBufferToMain(pDataFlash, DB_BUF1_PAGE_ERASE_PGM,
+ (page*pDataFlash->pDevice->pages_size)));
+}
+
+/*---------------------------------------------------------------------------*/
+/* Function Name : AT91F_DataFlashWrite */
+/* Object : */
+/* Input Parameters : <*src> = Source buffer */
+/* : <dest> = dataflash adress */
+/* : <size> = data buffer size */
+/*---------------------------------------------------------------------------*/
+AT91S_DataFlashStatus AT91F_DataFlashWrite(
+ AT91PS_DataFlash pDataFlash,
+ unsigned char *src,
+ int dest,
+ int size )
+{
+ unsigned int length;
+ unsigned int page;
+ unsigned int status;
+
+ AT91F_SpiEnable(pDataFlash->pDevice->cs);
+
+ if ( (dest + size) > (pDataFlash->pDevice->pages_size *
+ (pDataFlash->pDevice->pages_number)))
+ return DATAFLASH_MEMORY_OVERFLOW;
+
+ /* If destination does not fit a page start address */
+ if ((dest % ((unsigned int)(pDataFlash->pDevice->pages_size))) != 0 )
+ {
+ length = pDataFlash->pDevice->pages_size -
+ (dest %
+ ((unsigned int)
+ (pDataFlash->pDevice->pages_size)));
+
+ if (size < length)
+ length = size;
+
+ if(!AT91F_PartialPageWrite(pDataFlash,src, dest, length))
+ return DATAFLASH_ERROR;
+
+ AT91F_DataFlashWaitReady(pDataFlash->pDataFlashDesc,
+ AT91C_TIMEOUT_WRDY);
+
+ /* Update size, source and destination pointers */
+ size -= length;
+ dest += length;
+ src += length;
+ }
+
+ while (( size - pDataFlash->pDevice->pages_size ) >= 0 ) {
+ /* program dataflash page */
+ page = (unsigned int)dest / (pDataFlash->pDevice->pages_size);
+
+ status = AT91F_DataFlashWriteBuffer(pDataFlash,
+ DB_BUF1_WRITE, src, 0,
+ pDataFlash->pDevice->pages_size);
+ AT91F_DataFlashWaitReady(pDataFlash->pDataFlashDesc,
+ AT91C_TIMEOUT_WRDY);
+
+ status = AT91F_PageErase(pDataFlash, page);
+ AT91F_DataFlashWaitReady(pDataFlash->pDataFlashDesc,
+ AT91C_TIMEOUT_WRDY);
+ if (!status)
+ return DATAFLASH_ERROR;
+
+ status = AT91F_WriteBufferToMain (pDataFlash,
+ DB_BUF1_PAGE_PGM, dest);
+ if(!status)
+ return DATAFLASH_ERROR;
+
+ AT91F_DataFlashWaitReady(pDataFlash->pDataFlashDesc,
+ AT91C_TIMEOUT_WRDY);
+
+ /* Update size, source and destination pointers */
+ size -= pDataFlash->pDevice->pages_size;
+ dest += pDataFlash->pDevice->pages_size;
+ src += pDataFlash->pDevice->pages_size;
+ }
+
+ /* If still some bytes to read */
+ if ( size > 0 ) {
+ /* program dataflash page */
+ if(!AT91F_PartialPageWrite(pDataFlash, src, dest, size) )
+ return DATAFLASH_ERROR;
+
+ AT91F_DataFlashWaitReady(pDataFlash->pDataFlashDesc,
+ AT91C_TIMEOUT_WRDY);
+ }
+ return DATAFLASH_OK;
+}
+
+
+/*---------------------------------------------------------------------------*/
+/* Function Name : AT91F_DataFlashRead */
+/* Object : Read a block in dataflash */
+/* Input Parameters : */
+/* Return value : */
+/*---------------------------------------------------------------------------*/
+int AT91F_DataFlashRead(
+ AT91PS_DataFlash pDataFlash,
+ unsigned long addr,
+ unsigned long size,
+ char *buffer)
+{
+ unsigned long SizeToRead;
+
+ AT91F_SpiEnable(pDataFlash->pDevice->cs);
+
+ if(AT91F_DataFlashWaitReady(pDataFlash->pDataFlashDesc,
+ AT91C_TIMEOUT_WRDY) != DATAFLASH_OK)
+ return -1;
+
+ while (size) {
+ SizeToRead = (size < 0x8000)? size:0x8000;
+
+ if (AT91F_DataFlashWaitReady(pDataFlash->pDataFlashDesc,
+ AT91C_TIMEOUT_WRDY) != DATAFLASH_OK)
+ return -1;
+
+ if (AT91F_DataFlashContinuousRead (pDataFlash, addr,
+ (uchar *) buffer, SizeToRead) != DATAFLASH_OK)
+ return -1;
+
+ size -= SizeToRead;
+ addr += SizeToRead;
+ buffer += SizeToRead;
+ }
+
+ return DATAFLASH_OK;
+}
+
+
generated by cgit v1.1 at 2024-11-25 08:03:48 +0000