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/***************************************************************************
* __________ __ ___.
* Open \______ \ ____ ____ | | _\_ |__ _______ ___
* Source | _// _ \_/ ___\| |/ /| __ \ / _ \ \/ /
* Jukebox | | ( <_> ) \___| < | \_\ ( <_> > < <
* Firmware |____|_ /\____/ \___ >__|_ \|___ /\____/__/\_ \
* \/ \/ \/ \/ \/
*
* Copyright (C) 2024 Solomon Peachy
*
* 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 software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
* KIND, either express or implied.
*
****************************************************************************/
/* This is intended to be #included into the ATA driver */
#ifdef MAX_PHYS_SECTOR_SIZE
#ifdef MAX_VARIABLE_LOG_SECTOR
#define __MAX_VARIABLE_LOG_SECTOR MAX_VARIABLE_LOG_SECTOR
#else
#define __MAX_VARIABLE_LOG_SECTOR SECTOR_SIZE
#endif
#ifndef STORAGE_ALIGN_ATTR
#define STORAGE_ALIGN_ATTR __attribute__((aligned(sizeof(uint32_t))))
#endif
struct sector_cache_entry {
unsigned char data[MAX_PHYS_SECTOR_SIZE];
sector_t sectornum; /* logical sector */
bool inuse;
};
/* buffer for reading and writing large physical sectors */
static struct sector_cache_entry sector_cache STORAGE_ALIGN_ATTR;
static uint16_t phys_sector_mult = 1;
static int cache_sector(sector_t sector)
{
int rc;
/* round down to physical sector boundary */
sector &= ~(phys_sector_mult - 1);
/* check whether the sector is already cached */
if (sector_cache.inuse && (sector_cache.sectornum == sector))
return 0;
/* not found: read the sector */
sector_cache.inuse = false;
rc = ata_transfer_sectors(sector, phys_sector_mult, sector_cache.data, false);
if (!rc)
{
sector_cache.sectornum = sector;
sector_cache.inuse = true;
}
return rc;
}
static inline int flush_current_sector(void)
{
return ata_transfer_sectors(sector_cache.sectornum, phys_sector_mult,
sector_cache.data, true);
}
int ata_read_sectors(IF_MD(int drive,)
sector_t start,
int incount,
void* inbuf)
{
int rc = 0;
int offset;
#ifdef HAVE_MULTIDRIVE
(void)drive; /* unused for now */
#endif
mutex_lock(&ata_mutex);
offset = start & (phys_sector_mult - 1);
if (offset) /* first partial sector */
{
int partcount = MIN(incount, phys_sector_mult - offset);
rc = cache_sector(start);
if (rc)
{
rc = rc * 10 - 1;
goto error;
}
memcpy(inbuf, sector_cache.data + offset * log_sector_size,
partcount * log_sector_size);
start += partcount;
inbuf += partcount * log_sector_size;
incount -= partcount;
}
if (incount)
{
offset = incount & (phys_sector_mult - 1);
incount -= offset;
if (incount)
{
rc = ata_transfer_sectors(start, incount, inbuf, false);
if (rc)
{
rc = rc * 10 - 2;
goto error;
}
start += incount;
inbuf += incount * log_sector_size;
}
if (offset)
{
rc = cache_sector(start);
if (rc)
{
rc = rc * 10 - 3;
goto error;
}
memcpy(inbuf, sector_cache.data, offset * log_sector_size);
}
}
error:
mutex_unlock(&ata_mutex);
return rc;
}
int ata_write_sectors(IF_MD(int drive,)
sector_t start,
int count,
const void* buf)
{
int rc = 0;
int offset;
#ifdef HAVE_MULTIDRIVE
(void)drive; /* unused for now */
#endif
mutex_lock(&ata_mutex);
offset = start & (phys_sector_mult - 1);
if (offset) /* first partial sector */
{
int partcount = MIN(count, phys_sector_mult - offset);
rc = cache_sector(start);
if (rc)
{
rc = rc * 10 - 1;
goto error;
}
memcpy(sector_cache.data + offset * log_sector_size, buf,
partcount * log_sector_size);
rc = flush_current_sector();
if (rc)
{
rc = rc * 10 - 2;
goto error;
}
start += partcount;
buf += partcount * log_sector_size;
count -= partcount;
}
if (count)
{
offset = count & (phys_sector_mult - 1);
count -= offset;
if (count)
{
rc = ata_transfer_sectors(start, count, (void*)buf, true);
if (rc)
{
rc = rc * 10 - 3;
goto error;
}
start += count;
buf += count * log_sector_size;
}
if (offset)
{
rc = cache_sector(start);
if (rc)
{
rc = rc * 10 - 4;
goto error;
}
memcpy(sector_cache.data, buf, offset * log_sector_size);
rc = flush_current_sector();
if (rc)
{
rc = rc * 10 - 5;
goto error;
}
}
}
error:
mutex_unlock(&ata_mutex);
return rc;
}
static int ata_get_phys_sector_mult(void)
{
int rc = 0;
/* Find out the physical sector size */
if((identify_info[106] & 0xe000) == 0x6000) /* B14, B13 */
phys_sector_mult = BIT_N(identify_info[106] & 0x000f);
else
phys_sector_mult = 1;
DEBUGF("ata: %d logical sectors per phys sector", phys_sector_mult);
if((identify_info[209] & 0xc000) == 0x4000) { /* B14 */
if (identify_info[209] & 0x3fff) {
panicf("ata: Unaligned logical/physical sector mapping");
// XXX we can probably handle this by adding a fixed offset
// to all operations and subtracting this from the reported
// size. But we don't do tihs until we find a real-world need.
}
}
if (phys_sector_mult > 1)
{
/* Check if drive really needs emulation - if we can access
sector 1 then assume the drive supports "512e" and will handle
it better than us, so ignore the large physical sectors.
*/
char throwaway[__MAX_VARIABLE_LOG_SECTOR];
rc = ata_transfer_sectors(1, 1, &throwaway, false);
if (rc == 0)
phys_sector_mult = 1;
}
if (phys_sector_mult > (MAX_PHYS_SECTOR_SIZE/log_sector_size))
panicf("Unsupported physical sector size: %ld",
phys_sector_mult * log_sector_size);
memset(§or_cache, 0, sizeof(sector_cache));
return 0;
}
#endif /* MAX_PHYS_SECTOR_SIZE */
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