The VIA south bridges are able to relocate and toggle (enable or disable) their
SuperI/O functions. So far this is hardcoded such that all functions are always
enabled and are located at fixed addresses.
Some PC BIOSes seem to probe for I/O occupancy before activating such a function
and issue an error in case of a conflict. Since the functions are currently
enabled on reset, conflicts are always detected. Prevent that by implementing
relocation and toggling of the SuperI/O functions.
Note that all SuperI/O functions are now deactivated upon reset (except for
VT82C686B's serial ports where Fuloong 2e's rescue-yl seems to expect them to be
enabled by default). Rely on firmware to configure the functions accordingly.
Signed-off-by: Bernhard Beschow <shen...@gmail.com>
---
hw/isa/vt82c686.c | 66 ++++++++++++++++++++++++++++++++++++++++-------
1 file changed, 56 insertions(+), 10 deletions(-)
diff --git a/hw/isa/vt82c686.c b/hw/isa/vt82c686.c
index d3e0f6d01f..9f62fb5964 100644
--- a/hw/isa/vt82c686.c
+++ b/hw/isa/vt82c686.c
@@ -15,6 +15,9 @@
#include "qemu/osdep.h"
#include "hw/isa/vt82c686.h"
+#include "hw/block/fdc.h"
+#include "hw/char/parallel-isa.h"
+#include "hw/char/serial.h"
#include "hw/pci/pci.h"
#include "hw/qdev-properties.h"
#include "hw/ide/pci.h"
@@ -323,6 +326,18 @@ static uint64_t via_superio_cfg_read(void *opaque, hwaddr
addr, unsigned size)
return val;
}
+static void via_superio_devices_enable(ViaSuperIOState *s, uint8_t data)
+{
+ ISASuperIOClass *ic = ISA_SUPERIO_GET_CLASS(s);
+ size_t i;
+
+ isa_parallel_set_enabled(s->superio.parallel[0], (data & 0x3) != 3);
+ for (i = 0; i < ic->serial.count; i++) {
+ isa_serial_set_enabled(s->superio.serial[i], data & BIT(i + 2));
+ }
+ isa_fdc_set_enabled(s->superio.floppy, data & BIT(4));
+}
+
static void via_superio_class_init(ObjectClass *klass, void *data)
{
DeviceClass *dc = DEVICE_CLASS(klass);
@@ -368,7 +383,25 @@ static void vt82c686b_superio_cfg_write(void *opaque,
hwaddr addr,
case 0xfd ... 0xff:
/* ignore write to read only registers */
return;
- /* case 0xe6 ... 0xe8: Should set base port of parallel and serial */
+ case 0xe2:
+ data &= 0x1f;
+ via_superio_devices_enable(sc, data);
+ break;
+ case 0xe3:
+ data &= 0xfc;
+ isa_fdc_set_iobase(sc->superio.floppy, data << 2);
+ break;
+ case 0xe6:
+ isa_parallel_set_iobase(sc->superio.parallel[0], data << 2);
+ break;
+ case 0xe7:
+ data &= 0xfe;
+ isa_serial_set_iobase(sc->superio.serial[0], data << 2);
+ break;
+ case 0xe8:
+ data &= 0xfe;
+ isa_serial_set_iobase(sc->superio.serial[1], data << 2);
+ break;
default:
qemu_log_mask(LOG_UNIMP,
"via_superio_cfg: unimplemented register 0x%x\n", idx);
@@ -395,9 +428,14 @@ static void vt82c686b_superio_reset(DeviceState *dev)
/* Device ID */
vt82c686b_superio_cfg_write(s, 0, 0xe0, 1);
vt82c686b_superio_cfg_write(s, 1, 0x3c, 1);
- /* Function select - all disabled */
+ /*
+ * Function select - only serial enabled
+ * Fuloong 2e's rescue-yl prints to the serial console w/o enabling it.
This
+ * suggests that the serial ports are enabled by default, so override the
+ * datasheet.
+ */
vt82c686b_superio_cfg_write(s, 0, 0xe2, 1);
- vt82c686b_superio_cfg_write(s, 1, 0x03, 1);
+ vt82c686b_superio_cfg_write(s, 1, 0x0f, 1);
/* Floppy ctrl base addr 0x3f0-7 */
vt82c686b_superio_cfg_write(s, 0, 0xe3, 1);
vt82c686b_superio_cfg_write(s, 1, 0xfc, 1);
@@ -465,6 +503,21 @@ static void vt8231_superio_cfg_write(void *opaque, hwaddr
addr,
case 0xfd:
/* ignore write to read only registers */
return;
+ case 0xf2:
+ data &= 0x17;
+ via_superio_devices_enable(sc, data);
+ break;
+ case 0xf4:
+ data &= 0xfe;
+ isa_serial_set_iobase(sc->superio.serial[0], data << 2);
+ break;
+ case 0xf6:
+ isa_parallel_set_iobase(sc->superio.parallel[0], data << 2);
+ break;
+ case 0xf7:
+ data &= 0xfc;
+ isa_fdc_set_iobase(sc->superio.floppy, data << 2);
+ break;
default:
qemu_log_mask(LOG_UNIMP,
"via_superio_cfg: unimplemented register 0x%x\n", idx);
@@ -513,12 +566,6 @@ static void vt8231_superio_init(Object *obj)
VIA_SUPERIO(obj)->io_ops = &vt8231_superio_cfg_ops;
}
-static uint16_t vt8231_superio_serial_iobase(ISASuperIODevice *sio,
- uint8_t index)
-{
- return 0x2f8; /* FIXME: This should be settable via registers f2-f4 */
-}
-
static void vt8231_superio_class_init(ObjectClass *klass, void *data)
{
DeviceClass *dc = DEVICE_CLASS(klass);
@@ -526,7 +573,6 @@ static void vt8231_superio_class_init(ObjectClass *klass,
void *data)
dc->reset = vt8231_superio_reset;
sc->serial.count = 1;
- sc->serial.get_iobase = vt8231_superio_serial_iobase;
sc->parallel.count = 1;
sc->ide.count = 0; /* emulated by via-ide */
sc->floppy.count = 1;
--
2.43.0
