vt82c686: Fix SMBus IO base and configuration registers

The base address of the SMBus io ports and its enabled status is set
by registers in the PCI config space but this was not correctly
emulated. Instead the SMBus registers were mapped on realize to the
base address set by a property to the address expected by fuloong2e
firmware.

Fix the base and config register handling to more closely model
hardware which allows to remove the property and allows the guest to
control this mapping. Do all this in reset instead of realize so it's
correctly updated on reset.

Signed-off-by: BALATON Zoltan <balaton@eik.bme.hu>
Reviewed-by: Jiaxun Yang <jiaxun.yang@flygoat.com>
Message-Id: <f2ca2ad5f08ba8cee07afd9d67b4e75cda21db09.1610223397.git.balaton@eik.bme.hu>
Signed-off-by: Philippe Mathieu-Daudé <f4bug@amsat.org>

1 files changed, 36 insertions, 13 deletions

diff --git a/hw/isa/vt82c686.c b/hw/isa/vt82c686.c
index fe8961b057..9c4d153022 100644
--- a/hw/isa/vt82c686.c
+++ b/hw/isa/vt82c686.c
@@ -22,6 +22,7 @@
 #include "hw/i2c/pm_smbus.h"
 #include "qapi/error.h"
 #include "qemu/module.h"
+#include "qemu/range.h"
 #include "qemu/timer.h"
 #include "exec/address-spaces.h"
 #include "trace.h"
@@ -34,7 +35,6 @@ struct VT686PMState {
     ACPIREGS ar;
     APMState apm;
     PMSMBus smb;
-    uint32_t smb_io_base;
 };
 
 static void pm_io_space_update(VT686PMState *s)
@@ -50,11 +50,22 @@ static void pm_io_space_update(VT686PMState *s)
     memory_region_transaction_commit();
 }
 
+static void smb_io_space_update(VT686PMState *s)
+{
+    uint32_t smbase = pci_get_long(s->dev.config + 0x90) & 0xfff0UL;
+
+    memory_region_transaction_begin();
+    memory_region_set_address(&s->smb.io, smbase);
+    memory_region_set_enabled(&s->smb.io, s->dev.config[0xd2] & BIT(0));
+    memory_region_transaction_commit();
+}
+
 static int vmstate_acpi_post_load(void *opaque, int version_id)
 {
     VT686PMState *s = opaque;
 
     pm_io_space_update(s);
+    smb_io_space_update(s);
     return 0;
 }
 
@@ -77,8 +88,18 @@ static const VMStateDescription vmstate_acpi = {
 
 static void pm_write_config(PCIDevice *d, uint32_t addr, uint32_t val, int len)
 {
+    VT686PMState *s = VT82C686B_PM(d);
+
     trace_via_pm_write(addr, val, len);
     pci_default_write_config(d, addr, val, len);
+    if (ranges_overlap(addr, len, 0x90, 4)) {
+        uint32_t v = pci_get_long(s->dev.config + 0x90);
+        pci_set_long(s->dev.config + 0x90, (v & 0xfff0UL) | 1);
+    }
+    if (range_covers_byte(addr, len, 0xd2)) {
+        s->dev.config[0xd2] &= 0xf;
+        smb_io_space_update(s);
+    }
 }
 
 static void pm_update_sci(VT686PMState *s)
@@ -103,6 +124,17 @@ static void pm_tmr_timer(ACPIREGS *ar)
     pm_update_sci(s);
 }
 
+static void vt82c686b_pm_reset(DeviceState *d)
+{
+    VT686PMState *s = VT82C686B_PM(d);
+
+    /* SMBus IO base */
+    pci_set_long(s->dev.config + 0x90, 1);
+    s->dev.config[0xd2] = 0;
+
+    smb_io_space_update(s);
+}
+
 static void vt82c686b_pm_realize(PCIDevice *dev, Error **errp)
 {
     VT686PMState *s = VT82C686B_PM(dev);
@@ -116,13 +148,9 @@ static void vt82c686b_pm_realize(PCIDevice *dev, Error **errp)
     /* 0x48-0x4B is Power Management I/O Base */
     pci_set_long(pci_conf + 0x48, 0x00000001);
 
-    /* SMB ports:0xeee0~0xeeef */
-    s->smb_io_base = ((s->smb_io_base & 0xfff0) + 0x0);
-    pci_conf[0x90] = s->smb_io_base | 1;
-    pci_conf[0x91] = s->smb_io_base >> 8;
-    pci_conf[0xd2] = 0x90;
     pm_smbus_init(DEVICE(s), &s->smb, false);
-    memory_region_add_subregion(get_system_io(), s->smb_io_base, &s->smb.io);
+    memory_region_add_subregion(pci_address_space_io(dev), 0, &s->smb.io);
+    memory_region_set_enabled(&s->smb.io, false);
 
     apm_init(dev, &s->apm, NULL, s);
 
@@ -135,11 +163,6 @@ static void vt82c686b_pm_realize(PCIDevice *dev, Error **errp)
     acpi_pm1_cnt_init(&s->ar, &s->io, false, false, 2);
 }
 
-static Property via_pm_properties[] = {
-    DEFINE_PROP_UINT32("smb_io_base", VT686PMState, smb_io_base, 0),
-    DEFINE_PROP_END_OF_LIST(),
-};
-
 static void via_pm_class_init(ObjectClass *klass, void *data)
 {
     DeviceClass *dc = DEVICE_CLASS(klass);
@@ -151,10 +174,10 @@ static void via_pm_class_init(ObjectClass *klass, void *data)
     k->device_id = PCI_DEVICE_ID_VIA_ACPI;
     k->class_id = PCI_CLASS_BRIDGE_OTHER;
     k->revision = 0x40;
+    dc->reset = vt82c686b_pm_reset;
     dc->desc = "PM";
     dc->vmsd = &vmstate_acpi;
     set_bit(DEVICE_CATEGORY_BRIDGE, dc->categories);
-    device_class_set_props(dc, via_pm_properties);
 }
 
 static const TypeInfo via_pm_info = {