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/* -*- mode: C++; tab-width: 4 -*- */
/* ===================================================================== *\
Copyright (c) 2000-2001 Palm, Inc. or its subsidiaries.
All rights reserved.
This file is part of the Palm OS Emulator.
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.
\* ===================================================================== */
#include "EmCommon.h"
#include "EmTRGSD.h"
/************************************************************************
* This class handles the SPI SD controller interface used in the
* HandEra 330.
************************************************************************/
// SPI SD commands
#define SD_CMD0_GO_IDLE 0
#define SD_CMD1_GO_OPERATIONAL 1
#define SD_CMD9_SEND_CSD 9
#define SD_CMD10_SEND_CID 10
#define SD_CMD12_STOP_TRANS 12 // not supported
#define SD_CMD13_SEND_STATUS 13
#define SD_CMD16_SET_BLOCKLEN 16 // not supported
#define SD_CMD17_READ_SECTOR 17
#define SD_CMD18_READ_MULTI 18 // not supported
#define SD_CMD24_WRITE_SECTOR 24
#define SD_CMD25_WRITE_MULTI 25 // not supported
#define SD_CMD27_PROGRAM_CSD 27 // not supported
#define SD_CMD28_SET_WRITE_PROT 28 // not supported
#define SD_CMD29_CLR_WRITE_PROT 29 // not supported
#define SD_CMD30_SEND_WRITE_PROT 30 // not supported
#define SD_CMD32_ERASE_WR_BLK_START 32 // not supported
#define SD_CMD33_ERASE_WR_BLK_END 33 // not supported
#define SD_CMD38_ERASE 38 // not supported
#define SD_CMD42_LOCK_UNLOCK 42 // not supported
#define SD_CMD55_APP_CMD 55 // not supported
#define SD_CMD56_GEN_CMD 56 // not supported
#define SD_CMD58_READ_OCR 58 // not supported
#define SD_CMD59_CRC_ON_OFF 59 // not supported
#define SD_CMD_SIZE 6 // in bytes
#define SD_CSD_SIZE 16
#define SD_CID_SIZE 16
#define SD_R1_OP_STATE 0x00
#define SD_R1_IDLE_STATE 0x01
#define SD_R1_ILLEGAL_CMD 0x04
#define SD_STATUS_OK 0x00
#define SD_DATA_START 0xFE
#define SD_DATA_OK 0xE5
// ---------------------------------------------------------------------------
// ¥ EmTRGSD::EmTRGSD
// ---------------------------------------------------------------------------
EmTRGSD::EmTRGSD()
{
cmdIndex = 0;
sdBusState = sdBusGetCmdState;
}
// ---------------------------------------------------------------------------
// ¥ EmTRGSD::~EmTRGSD
// ---------------------------------------------------------------------------
EmTRGSD::~EmTRGSD()
{
}
// ---------------------------------------------------------------------------
// ¥ EmTRGSD::Initialize
// ---------------------------------------------------------------------------
void EmTRGSD::Initialize(void)
{
DiskIO.Initialize(EM_DISK_GENERIC_8MB, SD_DRIVE);
}
// ---------------------------------------------------------------------------
// ¥ EmTRGSD::Dispose
// ---------------------------------------------------------------------------
void EmTRGSD::Dispose(void)
{
DiskIO.Dispose();
}
// ---------------------------------------------------------------------------
// ¥ EmTRGSD::CompleteCommand
// complete command processing now that we have the data for it too
// ---------------------------------------------------------------------------
void EmTRGSD::CompleteCommand(void)
{
cmdIndex = 0;
dataIndex = 0;
sdBusState = sdBusSendResponseState;
sdBusNextState = sdBusGetCmdState;
responseIndex = 0;
switch (cmdBuffer[0] & 0x3f)
{
case SD_CMD24_WRITE_SECTOR :
DiskIO.WriteSector(sectorNum, &dataBuffer[1]);
// send data OK response
responseBuffer[0] = SD_DATA_OK;
responseSize = 1;
break;
default :
// unimplemented, should never get here
EmAssert(false);
sdBusState = sdBusGetCmdState;
break;
}
}
// ---------------------------------------------------------------------------
// ¥ EmTRGSD::ProcessCommand
// process the command we just received
// ---------------------------------------------------------------------------
void EmTRGSD::ProcessCommand(void)
{
// clear command buffer
cmdIndex = 0;
sdBusState = sdBusSendResponseState;
sdBusNextState = sdBusGetCmdState;
responseIndex = 0;
dataIndex = 0;
dataSize = 0;
switch (cmdBuffer[0] & 0x3f)
{
case SD_CMD0_GO_IDLE :
responseBuffer[0] = SD_R1_IDLE_STATE;
responseSize = 1;
break;
case SD_CMD1_GO_OPERATIONAL :
responseBuffer[0] = SD_R1_OP_STATE;
responseSize = 1;
break;
case SD_CMD9_SEND_CSD :
responseBuffer[0] = SD_R1_OP_STATE;
responseSize = 1;
sdBusNextState = sdBusSendDataState;
dataBuffer[0] = SD_DATA_START;
memcpy(&dataBuffer[1], m_currDisk.GetSD_CSD(EM_DISK_GENERIC_8MB), SD_CSD_SIZE);
dataBuffer[SD_CSD_SIZE+2] = 0x00; // 16bit crc (unused)
dataBuffer[SD_CSD_SIZE+3] = 0x00;
dataSize = SD_CSD_SIZE+4;
break;
case SD_CMD10_SEND_CID :
responseBuffer[0] = SD_R1_OP_STATE;
responseSize = 1;
sdBusNextState = sdBusSendDataState;
dataBuffer[0] = SD_DATA_START;
memcpy(&dataBuffer[1], m_currDisk.GetSD_CID(EM_DISK_GENERIC_8MB), SD_CID_SIZE);
dataBuffer[SD_CID_SIZE+1] = 0x00; // 16bit crc (unused)
dataBuffer[SD_CID_SIZE+2] = 0x00;
dataSize = SD_CID_SIZE+3;
break;
case SD_CMD13_SEND_STATUS :
responseBuffer[0] = SD_R1_OP_STATE;
responseBuffer[1] = SD_STATUS_OK;
responseSize = 2;
break;
case SD_CMD17_READ_SECTOR :
responseBuffer[0] = SD_R1_OP_STATE;
responseSize = 1;
sdBusNextState = sdBusSendDataState;
dataBuffer[0] = SD_DATA_START;
sectorNum = ((cmdBuffer[1] << 24) | (cmdBuffer[2] << 16) | (cmdBuffer[3] << 8) | cmdBuffer[4]);
// SD sector number is really a byte address...
sectorNum /= SECTOR_SIZE;
DiskIO.ReadSector(sectorNum, &dataBuffer[1]);
dataBuffer[SECTOR_SIZE+1] = 0x00; // 16 bit crc (unused)
dataBuffer[SECTOR_SIZE+2] = 0x00;
dataSize = SECTOR_SIZE+3;
break;
case SD_CMD24_WRITE_SECTOR :
responseBuffer[0] = SD_R1_OP_STATE;
responseSize = 1;
sectorNum = ((cmdBuffer[1] << 24) | (cmdBuffer[2] << 16) | (cmdBuffer[3] << 8) | cmdBuffer[4]);
// SD sector number is really a byte address...
sectorNum /= SECTOR_SIZE;
sdBusNextState = sdBusGetDataState;
dataSize = SECTOR_SIZE+3;
break;
default: // unimplemented
responseBuffer[0] = SD_R1_ILLEGAL_CMD;
responseSize = 1;
break;
}
}
// ---------------------------------------------------------------------------
// ¥ EmTRGSD::ExchangeBits
// ---------------------------------------------------------------------------
void EmTRGSD::ExchangeBits(uint16 txData, uint16 *rxData, uint16 bits)
{
switch (bits)
{
case 8 :
switch (sdBusState)
{
case sdBusGetCmdState :
// all SPI commands start first two bits 0, 1
if ((cmdIndex != 0) || ((txData & 0xC0) == 0x40))
{
cmdBuffer[cmdIndex] = txData;
cmdIndex++;
if (cmdIndex == SD_CMD_SIZE)
ProcessCommand();
}
*rxData = 0xffff;
break;
case sdBusSendResponseState :
*rxData = responseBuffer[responseIndex++];
if (responseIndex == responseSize)
sdBusState = sdBusNextState;
break;
case sdBusGetDataState :
// all data blocks start with SD_DATA_START
if ((dataIndex != 0) || (txData == SD_DATA_START))
{
dataBuffer[dataIndex++] = txData;
if (dataIndex == dataSize)
{
// finish processing command waiting for this data...
CompleteCommand();
}
}
*rxData = 0xffff;
break;
case sdBusSendDataState :
*rxData = dataBuffer[dataIndex++];
if (dataIndex == dataSize)
sdBusState = sdBusGetCmdState;
break;
default :
break;
}
break;
case 16 :
switch (sdBusState)
{
case sdBusGetCmdState :
// all SPI commands start first two bits 0, 1
if ((cmdIndex != 0) || ((txData & 0xC000) == 0x4000))
{
cmdBuffer[cmdIndex++] = (txData & 0xff00) >> 8;
cmdBuffer[cmdIndex++] = (txData & 0x00ff);
if (cmdIndex >= SD_CMD_SIZE)
ProcessCommand();
}
*rxData = 0xffff;
break;
case sdBusSendResponseState :
*rxData = responseBuffer[responseIndex++] << 8;
*rxData |= responseBuffer[responseIndex++];
if (responseIndex >= responseSize)
sdBusState = sdBusNextState;
break;
case sdBusGetDataState :
dataBuffer[dataIndex++] = (txData & 0xff00) >> 8;
dataBuffer[dataIndex++] = (txData & 0x00ff);
if (dataIndex >= dataSize)
{
// finish processing command waiting for this data...
CompleteCommand();
sdBusState = sdBusGetCmdState;
}
*rxData = 0xffff;
break;
case sdBusSendDataState :
*rxData = dataBuffer[dataIndex++] << 8;
*rxData |= dataBuffer[dataIndex++];
if (dataIndex >= dataSize)
sdBusState = sdBusGetCmdState;
break;
default :
break;
}
break;
default :
// not supported...
EmAssert(false);
break;
}
}
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