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| Current File : //usr/src/sys/boot/arm/at91/libat91/sd-card.c |
/*-
* Copyright (c) 2006 M. Warner Losh. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*
* This software is derived from software provide by Kwikbyte who specifically
* disclaimed copyright on the code.
*
* $FreeBSD: release/9.1.0/sys/boot/arm/at91/libat91/sd-card.c 168011 2007-03-28 22:31:32Z imp $
*/
//*----------------------------------------------------------------------------
//* ATMEL Microcontroller Software Support - ROUSSET -
//*----------------------------------------------------------------------------
//* The software is delivered "AS IS" without warranty or condition of any
//* kind, either express, implied or statutory. This includes without
//* limitation any warranty or condition with respect to merchantability or
//* fitness for any particular purpose, or against the infringements of
//* intellectual property rights of others.
//*----------------------------------------------------------------------------
//* File Name : main.c
//* Object : main application written in C
//* Creation : FB 21/11/2002
//*
//*----------------------------------------------------------------------------
#include "at91rm9200.h"
#include "lib_AT91RM9200.h"
#include "mci_device.h"
#include "lib.h"
#include "sd-card.h"
#define AT91C_MCI_TIMEOUT 1000000 /* For AT91F_MCIDeviceWaitReady */
#define BUFFER_SIZE_MCI_DEVICE 512
#define MASTER_CLOCK 60000000
//* Global Variables
AT91S_MciDevice MCI_Device;
char Buffer[BUFFER_SIZE_MCI_DEVICE];
/******************************************************************************
**Error return codes
******************************************************************************/
#define MCI_UNSUPP_SIZE_ERROR 5
#define MCI_UNSUPP_OFFSET_ERROR 6
//*----------------------------------------------------------------------------
//* \fn MCIDeviceWaitReady
//* \brief Wait for MCI Device ready
//*----------------------------------------------------------------------------
static void
MCIDeviceWaitReady(unsigned int timeout)
{
volatile int status;
do
{
status = AT91C_BASE_MCI->MCI_SR;
timeout--;
}
while( !(status & AT91C_MCI_NOTBUSY) && (timeout>0) );
status = AT91C_BASE_MCI->MCI_SR;
// If End of Tx Buffer Empty interrupt occurred
if (MCI_Device.state == AT91C_MCI_TX_SINGLE_BLOCK && status & AT91C_MCI_TXBUFE) {
AT91C_BASE_MCI->MCI_IDR = AT91C_MCI_TXBUFE;
AT91C_BASE_PDC_MCI->PDC_PTCR = AT91C_PDC_TXTDIS;
MCI_Device.state = AT91C_MCI_IDLE;
} // End of if AT91C_MCI_TXBUFF
// If End of Rx Buffer Full interrupt occurred
if (MCI_Device.state == AT91C_MCI_RX_SINGLE_BLOCK && status & AT91C_MCI_RXBUFF) {
AT91C_BASE_MCI->MCI_IDR = AT91C_MCI_RXBUFF;
AT91C_BASE_PDC_MCI->PDC_PTCR = AT91C_PDC_RXTDIS;
MCI_Device.state = AT91C_MCI_IDLE;
} // End of if AT91C_MCI_RXBUFF
}
inline static unsigned int
swap(unsigned int a)
{
return (((a & 0xff) << 24) | ((a & 0xff00) << 8) | ((a & 0xff0000) >> 8)
| ((a & 0xff000000) >> 24));
}
inline static void
wait_ready()
{
int status;
// wait for CMDRDY Status flag to read the response
do
{
status = AT91C_BASE_MCI->MCI_SR;
} while( !(status & AT91C_MCI_CMDRDY) );
}
//*----------------------------------------------------------------------------
//* \fn MCI_SendCommand
//* \brief Generic function to send a command to the MMC or SDCard
//*----------------------------------------------------------------------------
static int
MCI_SendCommand(
unsigned int Cmd,
unsigned int Arg)
{
unsigned int error;
AT91C_BASE_MCI->MCI_ARGR = Arg;
AT91C_BASE_MCI->MCI_CMDR = Cmd;
// printf("CMDR %x ARG %x\n", Cmd, Arg);
wait_ready();
// Test error ==> if crc error and response R3 ==> don't check error
error = (AT91C_BASE_MCI->MCI_SR) & AT91C_MCI_SR_ERROR;
if (error != 0) {
if (error != AT91C_MCI_RCRCE)
return (1);
}
return 0;
}
//*----------------------------------------------------------------------------
//* \fn MCI_GetStatus
//* \brief Addressed card sends its status register
//*----------------------------------------------------------------------------
static unsigned int
MCI_GetStatus()
{
if (MCI_SendCommand(SEND_STATUS_CMD, MCI_Device.RCA << 16))
return AT91C_CMD_SEND_ERROR;
return (AT91C_BASE_MCI->MCI_RSPR[0]);
}
//*----------------------------------------------------------------------------
//* \fn MCI_ReadBlock
//* \brief Read an ENTIRE block or PARTIAL block
//*----------------------------------------------------------------------------
static int
MCI_ReadBlock(int src, unsigned int *dataBuffer, int sizeToRead)
{
// unsigned log2sl = MCI_Device.READ_BL_LEN;
// unsigned sectorLength = 1 << log2sl;
unsigned sectorLength = 512;
///////////////////////////////////////////////////////////////////////
if (MCI_Device.state != AT91C_MCI_IDLE)
return 1;
if ((MCI_GetStatus() & AT91C_SR_READY_FOR_DATA) == 0)
return 1;
///////////////////////////////////////////////////////////////////////
// Init Mode Register
AT91C_BASE_MCI->MCI_MR |= ((sectorLength << 16) | AT91C_MCI_PDCMODE);
sizeToRead = sizeToRead / 4;
AT91C_BASE_PDC_MCI->PDC_PTCR = (AT91C_PDC_TXTDIS | AT91C_PDC_RXTDIS);
AT91C_BASE_PDC_MCI->PDC_RPR = (unsigned int)dataBuffer;
AT91C_BASE_PDC_MCI->PDC_RCR = sizeToRead;
// Send the Read single block command
if (MCI_SendCommand(READ_SINGLE_BLOCK_CMD, src))
return AT91C_READ_ERROR;
MCI_Device.state = AT91C_MCI_RX_SINGLE_BLOCK;
// Enable AT91C_MCI_RXBUFF Interrupt
AT91C_BASE_MCI->MCI_IER = AT91C_MCI_RXBUFF;
// (PDC) Receiver Transfer Enable
AT91C_BASE_PDC_MCI->PDC_PTCR = AT91C_PDC_RXTEN;
return 0;
}
int
MCI_read(char* dest, unsigned source, unsigned length)
{
// unsigned log2sl = MCI_Device.READ_BL_LEN;
// unsigned sectorLength = 1 << log2sl;
unsigned sectorLength = 512;
int sizeToRead;
unsigned int *walker;
//As long as there is data to read
while (length)
{
if (length > sectorLength)
sizeToRead = sectorLength;
else
sizeToRead = length;
MCIDeviceWaitReady(AT91C_MCI_TIMEOUT);
//Do the reading
if (MCI_ReadBlock(source,
(unsigned int*)dest, sizeToRead))
return -1;
//* Wait MCI Device Ready
MCIDeviceWaitReady(AT91C_MCI_TIMEOUT);
// Fix erratum in MCI part
for (walker = (unsigned int *)dest;
walker < (unsigned int *)(dest + sizeToRead); walker++)
*walker = swap(*walker);
//Update counters & pointers
length -= sizeToRead;
dest += sizeToRead;
source += sizeToRead;
}
return 0;
}
//*----------------------------------------------------------------------------
//* \fn MCI_SDCard_SendAppCommand
//* \brief Specific function to send a specific command to the SDCard
//*----------------------------------------------------------------------------
static int
MCI_SDCard_SendAppCommand(
unsigned int Cmd_App,
unsigned int Arg)
{
// Send the CMD55 for application specific command
AT91C_BASE_MCI->MCI_ARGR = (MCI_Device.RCA << 16 );
AT91C_BASE_MCI->MCI_CMDR = APP_CMD;
wait_ready();
// if an error occurs
if (AT91C_BASE_MCI->MCI_SR & AT91C_MCI_SR_ERROR)
return (1);
return (MCI_SendCommand(Cmd_App,Arg));
}
//*----------------------------------------------------------------------------
//* \fn MCI_GetCSD
//* \brief Asks to the specified card to send its CSD
//*----------------------------------------------------------------------------
static int
MCI_GetCSD(unsigned int rca, unsigned int *response)
{
if (MCI_SendCommand(SEND_CSD_CMD, (rca << 16)))
return 1;
response[0] = AT91C_BASE_MCI->MCI_RSPR[0];
response[1] = AT91C_BASE_MCI->MCI_RSPR[1];
response[2] = AT91C_BASE_MCI->MCI_RSPR[2];
response[3] = AT91C_BASE_MCI->MCI_RSPR[3];
return 0;
}
//*----------------------------------------------------------------------------
//* \fn MCI_SDCard_GetOCR
//* \brief Asks to all cards to send their operations conditions
//*----------------------------------------------------------------------------
static int
MCI_SDCard_GetOCR()
{
unsigned int response=0x0;
// The RCA to be used for CMD55 in Idle state shall be the card's default RCA=0x0000.
MCI_Device.RCA = 0x0;
while( (response & AT91C_CARD_POWER_UP_BUSY) != AT91C_CARD_POWER_UP_BUSY ) {
if (MCI_SDCard_SendAppCommand(SDCARD_APP_OP_COND_CMD,
AT91C_MMC_HOST_VOLTAGE_RANGE))
return 1;
response = AT91C_BASE_MCI->MCI_RSPR[0];
}
return (0);
}
//*----------------------------------------------------------------------------
//* \fn MCI_SDCard_GetCID
//* \brief Asks to the SDCard on the chosen slot to send its CID
//*----------------------------------------------------------------------------
static int
MCI_SDCard_GetCID(unsigned int *response)
{
if (MCI_SendCommand(ALL_SEND_CID_CMD, AT91C_NO_ARGUMENT))
return 1;
response[0] = AT91C_BASE_MCI->MCI_RSPR[0];
response[1] = AT91C_BASE_MCI->MCI_RSPR[1];
response[2] = AT91C_BASE_MCI->MCI_RSPR[2];
response[3] = AT91C_BASE_MCI->MCI_RSPR[3];
return 0;
}
//*----------------------------------------------------------------------------
//* \fn MCI_SDCard_SetBusWidth
//* \brief Set bus width for SDCard
//*----------------------------------------------------------------------------
static int
MCI_SDCard_SetBusWidth()
{
volatile int ret_value;
char bus_width;
do {
ret_value=MCI_GetStatus();
}
while((ret_value > 0) && ((ret_value & AT91C_SR_READY_FOR_DATA) == 0));
// Select Card
MCI_SendCommand(SEL_DESEL_CARD_CMD, (MCI_Device.RCA)<<16);
// Set bus width for Sdcard
if (MCI_Device.SDCard_bus_width == AT91C_MCI_SCDBUS)
bus_width = AT91C_BUS_WIDTH_4BITS;
else
bus_width = AT91C_BUS_WIDTH_1BIT;
if (MCI_SDCard_SendAppCommand(
SDCARD_SET_BUS_WIDTH_CMD,bus_width) != AT91C_CMD_SEND_OK)
return 1;
return 0;
}
//*----------------------------------------------------------------------------
//* \fn main
//* \brief main function
//*----------------------------------------------------------------------------
int
sdcard_init(void)
{
unsigned int tab_response[4];
#ifdef REPORT_SIZE
unsigned int mult,blocknr;
#endif
int i;
// Init MCI for MMC and SDCard interface
AT91F_MCI_CfgPIO();
AT91F_MCI_CfgPMC();
AT91F_PDC_Open(AT91C_BASE_PDC_MCI);
// Init Device Structure
MCI_Device.state = AT91C_MCI_IDLE;
MCI_Device.SDCard_bus_width = AT91C_MCI_SCDBUS;
//* Reset the MCI
AT91C_BASE_MCI->MCI_CR = AT91C_MCI_MCIEN | AT91C_MCI_PWSEN;
AT91C_BASE_MCI->MCI_IDR = 0xFFFFFFFF;
AT91C_BASE_MCI->MCI_DTOR = AT91C_MCI_DTOR_1MEGA_CYCLES;
AT91C_BASE_MCI->MCI_MR = AT91C_MCI_PDCMODE;
AT91C_BASE_MCI->MCI_SDCR = AT91C_MCI_SDCARD_4BITS_SLOTA;
MCI_SendCommand(GO_IDLE_STATE_CMD, AT91C_NO_ARGUMENT);
for (i = 0; i < 100; i++) {
if (!MCI_SDCard_GetOCR(&MCI_Device))
break;
printf(".");
}
if (i >= 100)
return 0;
if (MCI_SDCard_GetCID(tab_response))
return 0;
if (MCI_SendCommand(SET_RELATIVE_ADDR_CMD, 0))
return 0;
MCI_Device.RCA = (AT91C_BASE_MCI->MCI_RSPR[0] >> 16);
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
// 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;
#endif
if (MCI_SDCard_SetBusWidth())
return 0;
if (MCI_SendCommand(SET_BLOCKLEN_CMD, 1 << MCI_Device.READ_BL_LEN))
return 0;
#ifdef REPORT_SIZE
printf("Found SD card %u bytes\n", MCI_Device.Memory_Capacity);
#endif
return 1;
}