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ide: Add 8-bit data mode 

CompactFlash uses features 0x01 and 0x81 to enable/disable 8-bit data
path. Implement them.

Signed-off-by: Lubomir Rintel <lkundrak@v3.sk>
Message-Id: <20221130120238.706717-1-lkundrak@v3.sk>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
This commit is contained in:
Lubomir Rintel 2022-11-30 13:02:38 +01:00 committed by Paolo Bonzini
parent 9b063b7ea6
commit 1ea17d228e
2 changed files with 34 additions and 10 deletions
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43
hw/ide/core.c
View File

@ -1648,6 +1648,13 @@ static bool cmd_set_features(IDEState *s, uint8_t cmd)
/* XXX: valid for CDROM ? */
switch (s->feature) {
case 0x01: /* 8-bit I/O enable (CompactFlash) */
case 0x81: /* 8-bit I/O disable (CompactFlash) */
if (s->drive_kind != IDE_CFATA) {
goto abort_cmd;
}
s->io8 = !(s->feature & 0x80);
return true;
case 0x02: /* write cache enable */
blk_set_enable_write_cache(s->blk, true);
identify_data = (uint16_t *)s->identify_data;
@ -2374,12 +2381,20 @@ void ide_data_writew(void *opaque, uint32_t addr, uint32_t val)
}
p = s->data_ptr;
if (p + 2 > s->data_end) {
return;
}
if (s->io8) {
if (p + 1 > s->data_end) {
return;
}
*(uint16_t *)p = le16_to_cpu(val);
p += 2;
*p++ = val;
} else {
if (p + 2 > s->data_end) {
return;
}
*(uint16_t *)p = le16_to_cpu(val);
p += 2;
}
s->data_ptr = p;
if (p >= s->data_end) {
s->status &= ~DRQ_STAT;
@ -2401,12 +2416,20 @@ uint32_t ide_data_readw(void *opaque, uint32_t addr)
}
p = s->data_ptr;
if (p + 2 > s->data_end) {
return 0;
}
if (s->io8) {
if (p + 1 > s->data_end) {
return 0;
}
ret = cpu_to_le16(*(uint16_t *)p);
p += 2;
ret = *p++;
} else {
if (p + 2 > s->data_end) {
return 0;
}
ret = cpu_to_le16(*(uint16_t *)p);
p += 2;
}
s->data_ptr = p;
if (p >= s->data_end) {
s->status &= ~DRQ_STAT;

1
include/hw/ide/internal.h
View File

@ -402,6 +402,7 @@ struct IDEState {
uint8_t select;
uint8_t status;
bool io8;
bool reset_reverts;
/* set for lba48 access */