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-rw-r--r--hw/misc/mac_via.c194
1 files changed, 75 insertions, 119 deletions
diff --git a/hw/misc/mac_via.c b/hw/misc/mac_via.c
index ca2f939dd5..ff0156db76 100644
--- a/hw/misc/mac_via.c
+++ b/hw/misc/mac_via.c
@@ -279,6 +279,12 @@
#define VIA_TIMER_FREQ (783360)
#define VIA_ADB_POLL_FREQ 50 /* XXX: not real */
+/*
+ * Guide to the Macintosh Family Hardware ch. 12 "Displays" p. 401 gives the
+ * precise 60Hz interrupt frequency as ~60.15Hz with a period of 16625.8 us
+ */
+#define VIA_60HZ_TIMER_PERIOD_NS 16625800
+
/* VIA returns time offset from Jan 1, 1904, not 1970 */
#define RTC_OFFSET 2082844800
@@ -297,44 +303,32 @@ enum {
REG_EMPTY = 0xff,
};
-static void via1_VBL_update(MOS6522Q800VIA1State *v1s)
+static void via1_sixty_hz_update(MOS6522Q800VIA1State *v1s)
{
- MOS6522State *s = MOS6522(v1s);
-
/* 60 Hz irq */
- v1s->next_VBL = (qemu_clock_get_ns(QEMU_CLOCK_VIRTUAL) + 16630) /
- 16630 * 16630;
-
- if (s->ier & VIA1_IRQ_VBLANK) {
- timer_mod(v1s->VBL_timer, v1s->next_VBL);
- } else {
- timer_del(v1s->VBL_timer);
- }
+ v1s->next_sixty_hz = (qemu_clock_get_ns(QEMU_CLOCK_VIRTUAL) +
+ VIA_60HZ_TIMER_PERIOD_NS) /
+ VIA_60HZ_TIMER_PERIOD_NS * VIA_60HZ_TIMER_PERIOD_NS;
+ timer_mod(v1s->sixty_hz_timer, v1s->next_sixty_hz);
}
static void via1_one_second_update(MOS6522Q800VIA1State *v1s)
{
- MOS6522State *s = MOS6522(v1s);
-
v1s->next_second = (qemu_clock_get_ms(QEMU_CLOCK_VIRTUAL) + 1000) /
1000 * 1000;
- if (s->ier & VIA1_IRQ_ONE_SECOND) {
- timer_mod(v1s->one_second_timer, v1s->next_second);
- } else {
- timer_del(v1s->one_second_timer);
- }
+ timer_mod(v1s->one_second_timer, v1s->next_second);
}
-static void via1_VBL(void *opaque)
+static void via1_sixty_hz(void *opaque)
{
MOS6522Q800VIA1State *v1s = opaque;
MOS6522State *s = MOS6522(v1s);
MOS6522DeviceClass *mdc = MOS6522_GET_CLASS(s);
- s->ifr |= VIA1_IRQ_VBLANK;
+ s->ifr |= VIA1_IRQ_60HZ;
mdc->update_irq(s);
- via1_VBL_update(v1s);
+ via1_sixty_hz_update(v1s);
}
static void via1_one_second(void *opaque)
@@ -609,7 +603,6 @@ static void adb_via_poll(void *opaque)
uint8_t obuf[9];
uint8_t *data = &s->sr;
int olen;
- uint16_t pending;
/*
* Setting vADBInt below indicates that an autopoll reply has been
@@ -618,36 +611,36 @@ static void adb_via_poll(void *opaque)
*/
adb_autopoll_block(adb_bus);
- m->adb_data_in_index = 0;
- m->adb_data_out_index = 0;
- olen = adb_poll(adb_bus, obuf, adb_bus->autopoll_mask);
-
- if (olen > 0) {
- /* Autopoll response */
- *data = obuf[0];
- olen--;
- memcpy(m->adb_data_in, &obuf[1], olen);
- m->adb_data_in_size = olen;
+ if (m->adb_data_in_size > 0 && m->adb_data_in_index == 0) {
+ /*
+ * For older Linux kernels that switch to IDLE mode after sending the
+ * ADB command, detect if there is an existing response and return that
+ * as a a "fake" autopoll reply or bus timeout accordingly
+ */
+ *data = m->adb_data_out[0];
+ olen = m->adb_data_in_size;
s->b &= ~VIA1B_vADBInt;
qemu_irq_raise(m->adb_data_ready);
- } else if (olen < 0) {
- /* Bus timeout (device does not exist) */
- *data = 0xff;
- s->b |= VIA1B_vADBInt;
- adb_autopoll_unblock(adb_bus);
} else {
- pending = adb_bus->pending & ~(1 << (m->adb_autopoll_cmd >> 4));
+ /*
+ * Otherwise poll as normal
+ */
+ m->adb_data_in_index = 0;
+ m->adb_data_out_index = 0;
+ olen = adb_poll(adb_bus, obuf, adb_bus->autopoll_mask);
+
+ if (olen > 0) {
+ /* Autopoll response */
+ *data = obuf[0];
+ olen--;
+ memcpy(m->adb_data_in, &obuf[1], olen);
+ m->adb_data_in_size = olen;
- if (pending) {
- /*
- * Bus timeout (device exists but another device has data). Block
- * autopoll so the OS can read out the first EVEN and first ODD
- * byte to determine bus timeout and SRQ status
- */
- *data = m->adb_autopoll_cmd;
s->b &= ~VIA1B_vADBInt;
-
+ qemu_irq_raise(m->adb_data_ready);
+ } else {
+ *data = m->adb_autopoll_cmd;
obuf[0] = 0xff;
obuf[1] = 0xff;
olen = 2;
@@ -655,12 +648,8 @@ static void adb_via_poll(void *opaque)
memcpy(m->adb_data_in, obuf, olen);
m->adb_data_in_size = olen;
+ s->b &= ~VIA1B_vADBInt;
qemu_irq_raise(m->adb_data_ready);
- } else {
- /* Bus timeout (device exists but no other device has data) */
- *data = 0;
- s->b |= VIA1B_vADBInt;
- adb_autopoll_unblock(adb_bus);
}
}
@@ -783,27 +772,8 @@ static void adb_via_receive(MacVIAState *s, int state, uint8_t *data)
return;
case ADB_STATE_IDLE:
- /*
- * Since adb_request() will have already consumed the data from the
- * device, we must detect this extra state change and re-inject the
- * reponse as either a "fake" autopoll reply or bus timeout
- * accordingly
- */
- if (s->adb_data_in_index == 0) {
- if (adb_bus->status & ADB_STATUS_BUSTIMEOUT) {
- *data = 0xff;
- ms->b |= VIA1B_vADBInt;
- qemu_irq_raise(s->adb_data_ready);
- } else if (s->adb_data_in_size > 0) {
- adb_bus->status = ADB_STATUS_POLLREPLY;
- *data = s->adb_autopoll_cmd;
- ms->b &= ~VIA1B_vADBInt;
- qemu_irq_raise(s->adb_data_ready);
- }
- } else {
- ms->b |= VIA1B_vADBInt;
- adb_autopoll_unblock(adb_bus);
- }
+ ms->b |= VIA1B_vADBInt;
+ adb_autopoll_unblock(adb_bus);
trace_via1_adb_receive("IDLE", *data,
(ms->b & VIA1B_vADBInt) ? "+" : "-", adb_bus->status,
@@ -816,33 +786,37 @@ static void adb_via_receive(MacVIAState *s, int state, uint8_t *data)
switch (s->adb_data_in_index) {
case 0:
/* First EVEN byte: vADBInt indicates bus timeout */
- trace_via1_adb_receive(state == ADB_STATE_EVEN ? "EVEN" : " ODD",
- *data, (ms->b & VIA1B_vADBInt) ? "+" : "-",
- adb_bus->status, s->adb_data_in_index,
- s->adb_data_in_size);
-
- *data = s->adb_data_in[s->adb_data_in_index++];
+ *data = s->adb_data_in[s->adb_data_in_index];
if (adb_bus->status & ADB_STATUS_BUSTIMEOUT) {
ms->b &= ~VIA1B_vADBInt;
} else {
ms->b |= VIA1B_vADBInt;
}
- break;
- case 1:
- /* First ODD byte: vADBInt indicates SRQ */
trace_via1_adb_receive(state == ADB_STATE_EVEN ? "EVEN" : " ODD",
*data, (ms->b & VIA1B_vADBInt) ? "+" : "-",
adb_bus->status, s->adb_data_in_index,
s->adb_data_in_size);
- *data = s->adb_data_in[s->adb_data_in_index++];
+ s->adb_data_in_index++;
+ break;
+
+ case 1:
+ /* First ODD byte: vADBInt indicates SRQ */
+ *data = s->adb_data_in[s->adb_data_in_index];
pending = adb_bus->pending & ~(1 << (s->adb_autopoll_cmd >> 4));
if (pending) {
ms->b &= ~VIA1B_vADBInt;
} else {
ms->b |= VIA1B_vADBInt;
}
+
+ trace_via1_adb_receive(state == ADB_STATE_EVEN ? "EVEN" : " ODD",
+ *data, (ms->b & VIA1B_vADBInt) ? "+" : "-",
+ adb_bus->status, s->adb_data_in_index,
+ s->adb_data_in_size);
+
+ s->adb_data_in_index++;
break;
default:
@@ -852,14 +826,9 @@ static void adb_via_receive(MacVIAState *s, int state, uint8_t *data)
* end of the poll reply, so provide these extra bytes below to
* keep it happy
*/
- trace_via1_adb_receive(state == ADB_STATE_EVEN ? "EVEN" : " ODD",
- *data, (ms->b & VIA1B_vADBInt) ? "+" : "-",
- adb_bus->status, s->adb_data_in_index,
- s->adb_data_in_size);
-
if (s->adb_data_in_index < s->adb_data_in_size) {
/* Next data byte */
- *data = s->adb_data_in[s->adb_data_in_index++];
+ *data = s->adb_data_in[s->adb_data_in_index];
ms->b |= VIA1B_vADBInt;
} else if (s->adb_data_in_index == s->adb_data_in_size) {
if (adb_bus->status & ADB_STATUS_BUSTIMEOUT) {
@@ -869,7 +838,6 @@ static void adb_via_receive(MacVIAState *s, int state, uint8_t *data)
/* Return 0x0 after reply */
*data = 0;
}
- s->adb_data_in_index++;
ms->b &= ~VIA1B_vADBInt;
} else {
/* Bus timeout (no more data) */
@@ -878,6 +846,15 @@ static void adb_via_receive(MacVIAState *s, int state, uint8_t *data)
adb_bus->status = 0;
adb_autopoll_unblock(adb_bus);
}
+
+ trace_via1_adb_receive(state == ADB_STATE_EVEN ? "EVEN" : " ODD",
+ *data, (ms->b & VIA1B_vADBInt) ? "+" : "-",
+ adb_bus->status, s->adb_data_in_index,
+ s->adb_data_in_size);
+
+ if (s->adb_data_in_index <= s->adb_data_in_size) {
+ s->adb_data_in_index++;
+ }
break;
}
@@ -910,21 +887,6 @@ static uint64_t mos6522_q800_via1_read(void *opaque, hwaddr addr, unsigned size)
{
MOS6522Q800VIA1State *s = MOS6522_Q800_VIA1(opaque);
MOS6522State *ms = MOS6522(s);
- int64_t now = qemu_clock_get_ms(QEMU_CLOCK_VIRTUAL);
-
- /*
- * If IRQs are disabled, timers are disabled, but we need to update
- * VIA1_IRQ_VBLANK and VIA1_IRQ_ONE_SECOND bits in the IFR
- */
-
- if (now >= s->next_VBL) {
- ms->ifr |= VIA1_IRQ_VBLANK;
- via1_VBL_update(s);
- }
- if (now >= s->next_second) {
- ms->ifr |= VIA1_IRQ_ONE_SECOND;
- via1_one_second_update(s);
- }
addr = (addr >> 9) & 0xf;
return mos6522_read(ms, addr, size);
@@ -948,9 +910,6 @@ static void mos6522_q800_via1_write(void *opaque, hwaddr addr, uint64_t val,
v1s->last_b = ms->b;
break;
}
-
- via1_one_second_update(v1s);
- via1_VBL_update(v1s);
}
static const MemoryRegionOps mos6522_q800_via1_ops = {
@@ -959,7 +918,7 @@ static const MemoryRegionOps mos6522_q800_via1_ops = {
.endianness = DEVICE_BIG_ENDIAN,
.valid = {
.min_access_size = 1,
- .max_access_size = 1,
+ .max_access_size = 4,
},
};
@@ -988,23 +947,17 @@ static const MemoryRegionOps mos6522_q800_via2_ops = {
.endianness = DEVICE_BIG_ENDIAN,
.valid = {
.min_access_size = 1,
- .max_access_size = 1,
+ .max_access_size = 4,
},
};
static void mac_via_reset(DeviceState *dev)
{
MacVIAState *m = MAC_VIA(dev);
- MOS6522Q800VIA1State *v1s = &m->mos6522_via1;
ADBBusState *adb_bus = &m->adb_bus;
adb_set_autopoll_enabled(adb_bus, true);
- timer_del(v1s->VBL_timer);
- v1s->next_VBL = 0;
- timer_del(v1s->one_second_timer);
- v1s->next_second = 0;
-
m->cmd = REG_EMPTY;
m->alt = REG_EMPTY;
}
@@ -1043,8 +996,11 @@ static void mac_via_realize(DeviceState *dev, Error **errp)
m->mos6522_via1.one_second_timer = timer_new_ms(QEMU_CLOCK_VIRTUAL,
via1_one_second,
&m->mos6522_via1);
- m->mos6522_via1.VBL_timer = timer_new_ns(QEMU_CLOCK_VIRTUAL, via1_VBL,
- &m->mos6522_via1);
+ via1_one_second_update(&m->mos6522_via1);
+ m->mos6522_via1.sixty_hz_timer = timer_new_ns(QEMU_CLOCK_VIRTUAL,
+ via1_sixty_hz,
+ &m->mos6522_via1);
+ via1_sixty_hz_update(&m->mos6522_via1);
qemu_get_timedate(&tm, 0);
m->tick_offset = (uint32_t)mktimegm(&tm) + RTC_OFFSET;
@@ -1133,8 +1089,8 @@ static const VMStateDescription vmstate_mac_via = {
VMSTATE_BUFFER(mos6522_via1.PRAM, MacVIAState),
VMSTATE_TIMER_PTR(mos6522_via1.one_second_timer, MacVIAState),
VMSTATE_INT64(mos6522_via1.next_second, MacVIAState),
- VMSTATE_TIMER_PTR(mos6522_via1.VBL_timer, MacVIAState),
- VMSTATE_INT64(mos6522_via1.next_VBL, MacVIAState),
+ VMSTATE_TIMER_PTR(mos6522_via1.sixty_hz_timer, MacVIAState),
+ VMSTATE_INT64(mos6522_via1.next_sixty_hz, MacVIAState),
VMSTATE_STRUCT(mos6522_via2.parent_obj, MacVIAState, 0, vmstate_mos6522,
MOS6522State),
/* RTC */
generated by cgit v1.2.3-55-g7522 (git 2.39.0) at 2024-12-18 11:49:07 +0100