mirror of
https://github.com/wiiu-env/libfat.git
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3a9b3b5e3a
Combined all CF-based hardware drivers into one set of routines with different sets of registers. Speed should remain the same, but size should be reduced.
323 lines
9.1 KiB
C
323 lines
9.1 KiB
C
/*
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io_cf_common.c based on
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compact_flash.c
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By chishm (Michael Chisholm)
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Common hardware routines for using a compact flash card. This is not reentrant
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and does not do range checking on the supplied addresses. This is designed to
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be as fast as possible.
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CF routines modified with help from Darkfader
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Copyright (c) 2006 Michael "Chishm" Chisholm
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Redistribution and use in source and binary forms, with or without modification,
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are permitted provided that the following conditions are met:
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1. Redistributions of source code must retain the above copyright notice,
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this list of conditions and the following disclaimer.
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2. Redistributions in binary form must reproduce the above copyright notice,
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this list of conditions and the following disclaimer in the documentation and/or
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other materials provided with the distribution.
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3. The name of the author may not be used to endorse or promote products derived
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from this software without specific prior written permission.
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THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED
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WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY
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AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR BE
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LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
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LOSS OF USE, 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 THIS SOFTWARE,
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EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#include "io_cf_common.h"
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//---------------------------------------------------------------
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// DMA
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#ifdef _IO_USE_DMA
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#ifndef NDS
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#include "gba_dma.h"
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#else
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#include <nds/dma.h>
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#ifdef ARM9
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#include <nds/arm9/cache.h>
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#endif
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#endif
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#endif
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//---------------------------------------------------------------
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// CF Addresses & Commands
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CF_REGISTERS cfRegisters = {0};
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/*-----------------------------------------------------------------
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_CF_isInserted
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Is a compact flash card inserted?
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bool return OUT: true if a CF card is inserted
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-----------------------------------------------------------------*/
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bool _CF_isInserted (void) {
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// Change register, then check if value did change
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*(cfRegisters.status) = CF_STS_INSERTED;
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return ((*(cfRegisters.status) & 0xff) == CF_STS_INSERTED);
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}
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/*-----------------------------------------------------------------
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_CF_clearStatus
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Tries to make the CF card go back to idle mode
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bool return OUT: true if a CF card is idle
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-----------------------------------------------------------------*/
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bool _CF_clearStatus (void) {
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int i;
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// Wait until CF card is finished previous commands
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i=0;
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while ((*(cfRegisters.command) & CF_STS_BUSY) && (i < CF_CARD_TIMEOUT)) {
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i++;
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}
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// Wait until card is ready for commands
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i = 0;
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while ((!(*(cfRegisters.status) & CF_STS_INSERTED)) && (i < CF_CARD_TIMEOUT)) {
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i++;
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}
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if (i >= CF_CARD_TIMEOUT)
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return false;
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return true;
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}
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/*-----------------------------------------------------------------
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_CF_readSectors
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Read 512 byte sector numbered "sector" into "buffer"
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u32 sector IN: address of first 512 byte sector on CF card to read
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u32 numSectors IN: number of 512 byte sectors to read,
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1 to 256 sectors can be read
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void* buffer OUT: pointer to 512 byte buffer to store data in
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bool return OUT: true if successful
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-----------------------------------------------------------------*/
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bool _CF_readSectors (u32 sector, u32 numSectors, void* buffer) {
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int i;
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u16 *buff = (u16*)buffer;
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#ifdef _IO_ALLOW_UNALIGNED
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u8 *buff_u8 = (u8*)buffer;
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int temp;
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#endif
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#if (defined _IO_USE_DMA) && (defined NDS) && (defined ARM9)
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DC_FlushRange( buffer, j * BYTES_PER_READ);
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#endif
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// Wait until CF card is finished previous commands
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i=0;
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while ((*(cfRegisters.command) & CF_STS_BUSY) && (i < CF_CARD_TIMEOUT)) {
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i++;
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}
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// Wait until card is ready for commands
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i = 0;
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while ((!(*(cfRegisters.status) & CF_STS_INSERTED)) && (i < CF_CARD_TIMEOUT)) {
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i++;
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}
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if (i >= CF_CARD_TIMEOUT)
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return false;
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// Set number of sectors to read
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*(cfRegisters.sectorCount) = (numSectors < 256 ? numSectors : 0); // Read a maximum of 256 sectors, 0 means 256
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// Set read sector
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*(cfRegisters.lba1) = sector & 0xFF; // 1st byte of sector number
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*(cfRegisters.lba2) = (sector >> 8) & 0xFF; // 2nd byte of sector number
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*(cfRegisters.lba3) = (sector >> 16) & 0xFF; // 3rd byte of sector number
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*(cfRegisters.lba4) = ((sector >> 24) & 0x0F )| CF_CMD_LBA; // last nibble of sector number
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// Set command to read
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*(cfRegisters.command) = CF_CMD_READ;
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while (numSectors--)
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{
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// Wait until card is ready for reading
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i = 0;
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while (((*(cfRegisters.status) & 0xff)!= CF_STS_READY) && (i < CF_CARD_TIMEOUT))
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{
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i++;
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}
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if (i >= CF_CARD_TIMEOUT)
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return false;
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// Read data
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#ifdef _IO_USE_DMA
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#ifdef NDS
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DMA3_SRC = (u32)(cfRegisters.data);
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DMA3_DEST = (u32)buff;
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DMA3_CR = 256 | DMA_COPY_HALFWORDS | DMA_SRC_FIX;
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#else
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DMA3COPY ( (cfRegisters.data), buff, 256 | DMA16 | DMA_ENABLE | DMA_SRC_FIXED);
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#endif
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buff += BYTES_PER_READ / 2;
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#elif defined _IO_ALLOW_UNALIGNED
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i=256;
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if ((u32)buff_u8 & 0x01) {
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while(i--)
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{
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temp = *(cfRegisters.data);
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*buff_u8++ = temp & 0xFF;
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*buff_u8++ = temp >> 8;
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}
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} else {
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while(i--)
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*buff++ = *(cfRegisters.data);
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}
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#else
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i=256;
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while(i--)
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*buff++ = *(cfRegisters.data);
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#endif
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}
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#if (defined _IO_USE_DMA) && (defined NDS)
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// Wait for end of transfer before returning
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while(DMA3_CR & DMA_BUSY);
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#endif
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return true;
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}
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/*-----------------------------------------------------------------
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_CF_writeSectors
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Write 512 byte sector numbered "sector" from "buffer"
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u32 sector IN: address of 512 byte sector on CF card to read
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u32 numSectors IN: number of 512 byte sectors to read,
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1 to 256 sectors can be read
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void* buffer IN: pointer to 512 byte buffer to read data from
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bool return OUT: true if successful
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-----------------------------------------------------------------*/
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bool _CF_writeSectors (u32 sector, u32 numSectors, void* buffer) {
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int i;
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u16 *buff = (u16*)buffer;
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#ifdef _IO_ALLOW_UNALIGNED
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u8 *buff_u8 = (u8*)buffer;
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int temp;
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#endif
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#if defined _IO_USE_DMA && defined NDS && defined ARM9
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DC_FlushRange( buffer, j * BYTES_PER_READ);
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#endif
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// Wait until CF card is finished previous commands
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i=0;
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while ((*(cfRegisters.command) & CF_STS_BUSY) && (i < CF_CARD_TIMEOUT))
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{
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i++;
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}
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// Wait until card is ready for commands
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i = 0;
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while ((!(*(cfRegisters.status) & CF_STS_INSERTED)) && (i < CF_CARD_TIMEOUT))
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{
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i++;
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}
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if (i >= CF_CARD_TIMEOUT)
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return false;
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// Set number of sectors to write
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*(cfRegisters.sectorCount) = (numSectors < 256 ? numSectors : 0); // Write a maximum of 256 sectors, 0 means 256
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// Set write sector
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*(cfRegisters.lba1) = sector & 0xFF; // 1st byte of sector number
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*(cfRegisters.lba2) = (sector >> 8) & 0xFF; // 2nd byte of sector number
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*(cfRegisters.lba3) = (sector >> 16) & 0xFF; // 3rd byte of sector number
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*(cfRegisters.lba4) = ((sector >> 24) & 0x0F )| CF_CMD_LBA; // last nibble of sector number
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// Set command to write
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*(cfRegisters.command) = CF_CMD_WRITE;
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while (numSectors--)
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{
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// Wait until card is ready for writing
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i = 0;
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while (((*(cfRegisters.status) & 0xff) != CF_STS_READY) && (i < CF_CARD_TIMEOUT))
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{
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i++;
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}
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if (i >= CF_CARD_TIMEOUT)
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return false;
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// Write data
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#ifdef _IO_USE_DMA
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#ifdef NDS
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DMA3_SRC = (u32)buff;
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DMA3_DEST = (u32)(cfRegisters.data);
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DMA3_CR = 256 | DMA_COPY_HALFWORDS | DMA_DST_FIX;
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#else
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DMA3COPY( buff, (cfRegisters.data), 256 | DMA16 | DMA_ENABLE | DMA_DST_FIXED);
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#endif
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buff += BYTES_PER_READ / 2;
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#elif defined _IO_ALLOW_UNALIGNED
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i=256;
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if ((u32)buff_u8 & 0x01) {
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while(i--)
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{
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temp = *buff_u8++;
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temp |= *buff_u8++ << 8;
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*(cfRegisters.data) = temp;
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}
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} else {
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while(i--)
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*(cfRegisters.data) = *buff++;
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}
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#else
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i=256;
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while(i--)
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*(cfRegisters.data) = *buff++;
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#endif
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}
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#if defined _IO_USE_DMA && defined NDS
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// Wait for end of transfer before returning
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while(DMA3_CR & DMA_BUSY);
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#endif
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return true;
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}
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/*-----------------------------------------------------------------
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_CF_shutdown
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shutdown the CF interface
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-----------------------------------------------------------------*/
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bool _CF_shutdown(void) {
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return _CF_clearStatus() ;
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}
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/*-----------------------------------------------------------------
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_CF_startUp
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Initializes the CF interface using the supplied registers
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returns true if successful, otherwise returns false
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-----------------------------------------------------------------*/
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bool _CF_startup(const CF_REGISTERS *usableCfRegs) {
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cfRegisters = *usableCfRegs;
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// See if there is a read/write register
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u16 temp = *(cfRegisters.lba1);
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*(cfRegisters.lba1) = (~temp & 0xFF);
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temp = (~temp & 0xFF);
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if (!(*(cfRegisters.lba1) == temp)) {
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return false;
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}
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// Make sure it is 8 bit
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*(cfRegisters.lba1) = 0xAA55;
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if (*(cfRegisters.lba1) == 0xAA55) {
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return false;
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}
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return true;
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}
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