8926f21ce1
This also fixes a few minor violations of the SD protocol, such as running the bus at high speed during the card identification sequence. The sdcard_init() routine now probes for SDHC cards so that later read requests can make needed adjustments between block and byte offsets based on card type. There is a new MCI_readblocks() function that takes block number and block count parameters instead of byte-offset values. Using this routine, boot loader code can load a kernel from any location on an SDHC or standard SD. The old MCI_read() interface remains unchanged so that existing customized boot loader code will still keep working without changes. Using this routine, boot loaders can load a kernel from anywhere in the first 4GB of an SDHC card (or of course any location on a standard SD card). A new sdcard_use4wire() routine allows boot loaders to request 4-bit transfers; it should be called after sdcard_init(). The sdcard_init() routine no longer assumes the hardware is 4-wire capable and by default sets things up for 1-bit transfers. (4-wire mode is unreliable on at91rm9200, works on later SoCs.) PR: 155894 Submitted by: me. years ago.
518 lines
16 KiB
C
518 lines
16 KiB
C
/*-
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* Copyright (c) 2006 M. Warner Losh. All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
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* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*
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* This software is derived from software provide by Kwikbyte who specifically
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* disclaimed copyright on the code.
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*
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* $FreeBSD$
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*/
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//*----------------------------------------------------------------------------
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//* ATMEL Microcontroller Software Support - ROUSSET -
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//*----------------------------------------------------------------------------
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//* The software is delivered "AS IS" without warranty or condition of any
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//* kind, either express, implied or statutory. This includes without
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//* limitation any warranty or condition with respect to merchantability or
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//* fitness for any particular purpose, or against the infringements of
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//* intellectual property rights of others.
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//*----------------------------------------------------------------------------
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//* File Name : main.c
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//* Object : main application written in C
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//* Creation : FB 21/11/2002
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//*
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//*----------------------------------------------------------------------------
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#include "at91rm9200.h"
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#include "lib_AT91RM9200.h"
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#include "mci_device.h"
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#include "lib.h"
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#include "sd-card.h"
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#define AT91C_MCI_TIMEOUT 1000000 /* For AT91F_MCIDeviceWaitReady */
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#define SD_BLOCK_SIZE 512
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//* Global Variables
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static AT91S_MciDevice MCI_Device;
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/******************************************************************************
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**Error return codes
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******************************************************************************/
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#define MCI_UNSUPP_SIZE_ERROR 5
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#define MCI_UNSUPP_OFFSET_ERROR 6
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//*----------------------------------------------------------------------------
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//* \fn MCIDeviceWaitReady
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//* \brief Wait for MCI Device ready
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//*----------------------------------------------------------------------------
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static unsigned int
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MCIDeviceWaitReady(unsigned int timeout)
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{
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volatile unsigned int status;
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int waitfor;
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if (MCI_Device.state == AT91C_MCI_RX_SINGLE_BLOCK)
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waitfor = AT91C_MCI_RXBUFF;
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else
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waitfor = AT91C_MCI_NOTBUSY;
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do
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{
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status = AT91C_BASE_MCI->MCI_SR;
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timeout--;
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}
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while( !(status & waitfor) && (timeout>0) );
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status = AT91C_BASE_MCI->MCI_SR;
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// If End of Tx Buffer Empty interrupt occurred
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if (MCI_Device.state == AT91C_MCI_TX_SINGLE_BLOCK && status & AT91C_MCI_TXBUFE) {
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AT91C_BASE_MCI->MCI_IDR = AT91C_MCI_TXBUFE;
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AT91C_BASE_PDC_MCI->PDC_PTCR = AT91C_PDC_TXTDIS;
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MCI_Device.state = AT91C_MCI_IDLE;
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} // End of if AT91C_MCI_TXBUFF
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// If End of Rx Buffer Full interrupt occurred
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if (MCI_Device.state == AT91C_MCI_RX_SINGLE_BLOCK && status & AT91C_MCI_RXBUFF) {
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AT91C_BASE_MCI->MCI_IDR = AT91C_MCI_RXBUFF;
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AT91C_BASE_PDC_MCI->PDC_PTCR = AT91C_PDC_RXTDIS;
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MCI_Device.state = AT91C_MCI_IDLE;
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} // End of if AT91C_MCI_RXBUFF
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//printf("WaitReady returning status %x\n", status);
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return status;
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}
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static inline unsigned int
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swap(unsigned int v)
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{
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unsigned int t1;
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__asm __volatile("eor %1, %0, %0, ror #16\n"
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"bic %1, %1, #0x00ff0000\n"
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"mov %0, %0, ror #8\n"
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"eor %0, %0, %1, lsr #8\n"
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: "+r" (v), "=r" (t1));
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return (v);
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}
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inline static unsigned int
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wait_ready()
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{
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int status;
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int timeout = AT91C_MCI_TIMEOUT;
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// wait for CMDRDY Status flag to read the response
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do
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{
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status = AT91C_BASE_MCI->MCI_SR;
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} while( !(status & AT91C_MCI_CMDRDY) && (--timeout > 0) );
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return status;
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}
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//*----------------------------------------------------------------------------
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//* \fn MCI_SendCommand
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//* \brief Generic function to send a command to the MMC or SDCard
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//*----------------------------------------------------------------------------
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static int
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MCI_SendCommand(
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unsigned int Cmd,
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unsigned int Arg)
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{
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unsigned int error;
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unsigned int errorMask = AT91C_MCI_SR_ERROR;
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unsigned int opcode = Cmd & 0x3F;
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//printf("SendCmd %d (%x) arg %x\n", opcode, Cmd, Arg);
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// Don't check response CRC on ACMD41 (R3 response type).
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if (opcode == 41)
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errorMask &= ~AT91C_MCI_RCRCE;
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AT91C_BASE_MCI->MCI_ARGR = Arg;
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AT91C_BASE_MCI->MCI_CMDR = Cmd;
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error = wait_ready();
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if ((error & errorMask) != 0) {
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return (1);
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}
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return 0;
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}
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//*----------------------------------------------------------------------------
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//* \fn MCI_GetStatus
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//* \brief Addressed card sends its status register
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//*----------------------------------------------------------------------------
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static unsigned int
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MCI_GetStatus()
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{
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if (MCI_SendCommand(SEND_STATUS_CMD, MCI_Device.RCA << 16))
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return 0;
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return (AT91C_BASE_MCI->MCI_RSPR[0]);
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}
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//*----------------------------------------------------------------------------
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//* \fn MCI_ReadBlock
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//* \brief Start the read for a single 512-byte block
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//*----------------------------------------------------------------------------
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static int
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MCI_StartReadBlock(unsigned blknum, void *dataBuffer)
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{
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// Init Mode Register
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AT91C_BASE_MCI->MCI_MR |= ((SD_BLOCK_SIZE << 16) | AT91C_MCI_PDCMODE);
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// (PDC) Receiver Transfer Enable
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AT91C_BASE_PDC_MCI->PDC_PTCR = (AT91C_PDC_TXTDIS | AT91C_PDC_RXTDIS);
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AT91C_BASE_PDC_MCI->PDC_RPR = (unsigned int)dataBuffer;
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AT91C_BASE_PDC_MCI->PDC_RCR = SD_BLOCK_SIZE / 4;;
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AT91C_BASE_PDC_MCI->PDC_PTCR = AT91C_PDC_RXTEN;
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// SDHC wants block offset, non-HC wants byte offset.
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if (!MCI_Device.IsSDHC)
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blknum *= SD_BLOCK_SIZE;
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// Send the Read single block command
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if (MCI_SendCommand(READ_SINGLE_BLOCK_CMD, blknum)) {
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return AT91C_READ_ERROR;
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}
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MCI_Device.state = AT91C_MCI_RX_SINGLE_BLOCK;
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return 0;
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}
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//*----------------------------------------------------------------------------
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//* \fn MCI_readblocks
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//* \brief Read one or more blocks
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//*----------------------------------------------------------------------------
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int
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MCI_readblocks(char* dest, unsigned blknum, unsigned blkcount)
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{
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unsigned int status;
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unsigned int *walker;
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if (MCI_Device.state != AT91C_MCI_IDLE) {
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return 1;
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}
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if ((MCI_GetStatus() & AT91C_SR_READY_FOR_DATA) == 0) {
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return 1;
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}
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// As long as there is data to read
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while (blkcount)
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{
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//Do the reading
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if (MCI_StartReadBlock(blknum, dest))
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return -1;
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// Wait MCI Device Ready
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status = MCIDeviceWaitReady(AT91C_MCI_TIMEOUT);
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if (status & AT91C_MCI_SR_ERROR)
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return 1;
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// Fix erratum in MCI part - endian-swap all data.
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for (walker = (unsigned int *)dest;
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walker < (unsigned int *)(dest + SD_BLOCK_SIZE); walker++)
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*walker = swap(*walker);
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// Update counters & pointers
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++blknum;
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--blkcount;
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dest += SD_BLOCK_SIZE;
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}
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return 0;
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}
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//*----------------------------------------------------------------------------
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//* \fn MCI_read
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//* \brief Legacy read function, takes byte offset and length but was always
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//* used to read full blocks; interface preserved for existing boot code.
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//*----------------------------------------------------------------------------
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int
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MCI_read(char* dest, unsigned byteoffset, unsigned length)
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{
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return MCI_readblocks(dest,
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byteoffset/SD_BLOCK_SIZE, length/SD_BLOCK_SIZE);
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}
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//*----------------------------------------------------------------------------
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//* \fn MCI_SDCard_SendAppCommand
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//* \brief Specific function to send a specific command to the SDCard
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//*----------------------------------------------------------------------------
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static int
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MCI_SDCard_SendAppCommand(
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unsigned int Cmd_App,
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unsigned int Arg)
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{
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int status;
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if ((status = MCI_SendCommand(APP_CMD, (MCI_Device.RCA << 16))) == 0)
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status = MCI_SendCommand(Cmd_App,Arg);
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return status;
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}
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//*----------------------------------------------------------------------------
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//* \fn MCI_GetCSD
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//* \brief Asks to the specified card to send its CSD
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//*----------------------------------------------------------------------------
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static int
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MCI_GetCSD(unsigned int rca, unsigned int *response)
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{
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if (MCI_SendCommand(SEND_CSD_CMD, (rca << 16)))
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return 1;
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response[0] = AT91C_BASE_MCI->MCI_RSPR[0];
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response[1] = AT91C_BASE_MCI->MCI_RSPR[1];
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response[2] = AT91C_BASE_MCI->MCI_RSPR[2];
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response[3] = AT91C_BASE_MCI->MCI_RSPR[3];
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return 0;
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}
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//*----------------------------------------------------------------------------
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//* \fn MCI_SDCard_GetOCR
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//* \brief Wait for card to power up and determine whether it's SDHC or not.
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//*----------------------------------------------------------------------------
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static int
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MCI_SDCard_GetOCR()
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{
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unsigned int response;
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unsigned int arg = AT91C_MMC_HOST_VOLTAGE_RANGE;
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int timeout = AT91C_MCI_TIMEOUT;
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// Force card to idle state.
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MCI_SendCommand(GO_IDLE_STATE_CMD, AT91C_NO_ARGUMENT);
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// Begin probe for SDHC by sending CMD8; only v2.0 cards respond to it.
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//
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// Arg is vvpp where vv is voltage range and pp is an arbitrary bit
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// pattern that gets echoed back in the response. The only voltage
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// ranges defined are:
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// 0x01 = 2.7 - 3.6
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// 0x02 = "reserved for low voltage" whatever that means.
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//
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// If the card fails to respond then it's not v2.0. If it responds by
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// echoing back exactly the arg we sent, then it's a v2.0 card and can
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// run at our voltage. That means that when we send the ACMD41 (in
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// MCI_SDCard_GetOCR) we can include the HCS bit to inquire about SDHC.
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if (MCI_SendCommand(SD_SEND_IF_COND_CMD, 0x01AA) == 0) {
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MCI_Device.IsSDv2 = (AT91C_BASE_MCI->MCI_RSPR[0] == 0x01AA);
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}
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// If we've determined the card supports v2.0 functionality, set the
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// HCS/CCS bit to indicate that we support SDHC. This will cause a
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// v2.0 card to report whether it is SDHC in the ACMD41 response.
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if (MCI_Device.IsSDv2) {
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arg |= AT91C_CCS;
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}
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// The RCA to be used for CMD55 in Idle state shall be the card's
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// default RCA=0x0000.
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MCI_Device.RCA = 0x0;
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// Repeat ACMD41 until the card comes out of power-up-busy state.
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do {
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if (MCI_SDCard_SendAppCommand(SDCARD_APP_OP_COND_CMD, arg)) {
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return 1;
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}
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response = AT91C_BASE_MCI->MCI_RSPR[0];
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} while (!(response & AT91C_CARD_POWER_UP_DONE) && (--timeout > 0));
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// A v2.0 card sets CCS (card capacity status) in the response if it's SDHC.
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if (MCI_Device.IsSDv2) {
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MCI_Device.IsSDHC = ((response & AT91C_CCS) == AT91C_CCS);
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}
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return (0);
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}
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//*----------------------------------------------------------------------------
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//* \fn MCI_SDCard_GetCID
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//* \brief Asks to the SDCard on the chosen slot to send its CID
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//*----------------------------------------------------------------------------
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static int
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MCI_SDCard_GetCID(unsigned int *response)
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{
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if (MCI_SendCommand(ALL_SEND_CID_CMD, AT91C_NO_ARGUMENT))
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return 1;
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response[0] = AT91C_BASE_MCI->MCI_RSPR[0];
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response[1] = AT91C_BASE_MCI->MCI_RSPR[1];
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response[2] = AT91C_BASE_MCI->MCI_RSPR[2];
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response[3] = AT91C_BASE_MCI->MCI_RSPR[3];
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return 0;
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}
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//*----------------------------------------------------------------------------
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//* \fn sdcard_4wire
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//* \brief Set bus width to 1-bit or 4-bit according to the parm.
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//*
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//* Unlike most functions in this file, the return value from this one is
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//* bool-ish; returns 0 on failure, 1 on success.
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//*----------------------------------------------------------------------------
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int
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sdcard_use4wire(int use4wire)
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{
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volatile int ret_value;
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do {
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ret_value=MCI_GetStatus();
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}
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while((ret_value > 0) && ((ret_value & AT91C_SR_READY_FOR_DATA) == 0));
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// If going to 4-wire mode, ask the card to turn off the DAT3 card detect
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// pullup resistor, if going to 1-wire ask it to turn it back on.
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ret_value = MCI_SDCard_SendAppCommand(SDCARD_SET_CLR_CARD_DETECT_CMD,
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use4wire ? 0 : 1);
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if (ret_value != AT91C_CMD_SEND_OK)
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return 0;
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// Ask the card to go into the requested mode.
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ret_value = MCI_SDCard_SendAppCommand(SDCARD_SET_BUS_WIDTH_CMD,
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use4wire ? AT91C_BUS_WIDTH_4BITS :
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AT91C_BUS_WIDTH_1BIT);
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if (ret_value != AT91C_CMD_SEND_OK)
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return 0;
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// Set the MCI device to match the mode we set in the card.
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if (use4wire) {
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MCI_Device.SDCard_bus_width = AT91C_BUS_WIDTH_4BITS;
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AT91C_BASE_MCI->MCI_SDCR |= AT91C_MCI_SCDBUS;
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} else {
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MCI_Device.SDCard_bus_width = AT91C_BUS_WIDTH_1BIT;
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AT91C_BASE_MCI->MCI_SDCR &= ~AT91C_MCI_SCDBUS;
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}
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return 1;
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}
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//*----------------------------------------------------------------------------
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//* \fn sdcard_init
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//* \brief get the mci device ready to read from an SD or SDHC card.
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//*
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//* Unlike most functions in this file, the return value from this one is
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//* bool-ish; returns 0 on failure, 1 on success.
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//*----------------------------------------------------------------------------
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int
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sdcard_init(void)
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{
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unsigned int tab_response[4];
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int i;
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// Init MCI for MMC and SDCard interface
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AT91F_MCI_CfgPIO();
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AT91F_MCI_CfgPMC();
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AT91F_PDC_Open(AT91C_BASE_PDC_MCI);
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// Init Device Structure
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MCI_Device.state = AT91C_MCI_IDLE;
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MCI_Device.SDCard_bus_width = 0;
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MCI_Device.IsSDv2 = 0;
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MCI_Device.IsSDHC = 0;
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// Reset the MCI and set the bus speed.
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// Using MCK/230 gives a legal (under 400khz) bus speed for the card id
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// sequence for all reasonable master clock speeds.
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AT91C_BASE_MCI->MCI_CR = AT91C_MCI_MCIDIS | 0x80;
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AT91C_BASE_MCI->MCI_IDR = 0xFFFFFFFF;
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AT91C_BASE_MCI->MCI_DTOR = AT91C_MCI_DTOR_1MEGA_CYCLES;
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AT91C_BASE_MCI->MCI_MR = AT91C_MCI_PDCMODE | 114; /* clkdiv 114 = MCK/230 */
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AT91C_BASE_MCI->MCI_SDCR = AT91C_MCI_MMC_SLOTA;
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AT91C_BASE_MCI->MCI_CR = AT91C_MCI_MCIEN|AT91C_MCI_PWSEN;
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// Wait for the card to come out of power-up-busy state by repeatedly
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// sending ACMD41. This also probes for SDHC versus standard cards.
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for (i = 0; i < 100; i++) {
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if (MCI_SDCard_GetOCR() == 0)
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break;
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if ((i & 0x01) == 0) {
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printf(".");
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}
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}
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if (i >= 100)
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return 0;
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if (MCI_SDCard_GetCID(tab_response))
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return 0;
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// Tell the card to set its address, and remember the result.
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|
|
|
if (MCI_SendCommand(SET_RELATIVE_ADDR_CMD, 0))
|
|
return 0;
|
|
MCI_Device.RCA = (AT91C_BASE_MCI->MCI_RSPR[0] >> 16);
|
|
|
|
// After sending CMD3 (set addr) we can increase the clock to full speed.
|
|
// Using MCK/4 gives a legal (under 25mhz) bus speed for all reasonable
|
|
// master clock speeds.
|
|
|
|
AT91C_BASE_MCI->MCI_MR = AT91C_MCI_PDCMODE | 1; /* clkdiv 1 = MCK/4 */
|
|
|
|
if (MCI_GetCSD(MCI_Device.RCA,tab_response))
|
|
return 0;
|
|
MCI_Device.READ_BL_LEN = (tab_response[1] >> CSD_1_RD_B_LEN_S) &
|
|
CSD_1_RD_B_LEN_M;
|
|
|
|
#ifdef REPORT_SIZE
|
|
{
|
|
unsigned int mult,blocknr;
|
|
// compute MULT
|
|
mult = 1 << ( ((tab_response[2] >> CSD_2_C_SIZE_M_S) &
|
|
CSD_2_C_SIZE_M_M) + 2 );
|
|
// compute MSB of C_SIZE
|
|
blocknr = ((tab_response[1] >> CSD_1_CSIZE_H_S) &
|
|
CSD_1_CSIZE_H_M) << 2;
|
|
// compute MULT * (LSB of C-SIZE + MSB already computed + 1) = BLOCKNR
|
|
blocknr = mult * ((blocknr + ((tab_response[2] >> CSD_2_CSIZE_L_S) &
|
|
CSD_2_CSIZE_L_M)) + 1);
|
|
MCI_Device.Memory_Capacity = (1 << MCI_Device.READ_BL_LEN) * blocknr;
|
|
printf("Found SD card %u bytes\n", MCI_Device.Memory_Capacity);
|
|
}
|
|
#endif
|
|
|
|
// Select card and set block length for following transfers.
|
|
|
|
if (MCI_SendCommand(SEL_DESEL_CARD_CMD, (MCI_Device.RCA)<<16))
|
|
return 0;
|
|
if (MCI_SendCommand(SET_BLOCKLEN_CMD, SD_BLOCK_SIZE))
|
|
return 0;
|
|
|
|
return 1;
|
|
}
|