[RFC PATCH 1/5] ide: Make room for flags in PCIIDEState and add one for legacy mode

[Philippe Mathieu-Daudé]

From: BALATON Zoltan <balaton@eik.bme.hu>

We'll need a flag for implementing some device specific behaviour in
via-ide but we already have a currently CMD646 specific field that can
be repurposed for this and leave room for further flags if needed in
the future. This patch changes the "secondary" field to "flags" and
change CMD646 and its users accordingly and define a new flag for
forcing legacy mode that will be used by via-ide for now.

Signed-off-by: BALATON Zoltan <balaton@eik.bme.hu>
Tested-by: Guenter Roeck <linux@roeck-us.net>
Reviewed-by: Philippe Mathieu-Daudé <f4bug@amsat.org>
Reviewed-by: Guenter Roeck <linux@roeck-us.net>
Message-Id: 
<28150c05831caea5926d4c6a881f448c2827703d.1609191252.git.balaton@eik.bme.hu>
Signed-off-by: Philippe Mathieu-Daudé <f4bug@amsat.org>
---
 include/hw/ide/pci.h | 7 ++++++-
 hw/ide/cmd646.c      | 6 +++---
 hw/sparc64/sun4u.c   | 2 +-
 3 files changed, 10 insertions(+), 5 deletions(-)

diff --git a/include/hw/ide/pci.h b/include/hw/ide/pci.h
index d8384e1c422..75d1a32f6d2 100644
--- a/include/hw/ide/pci.h
+++ b/include/hw/ide/pci.h
@@ -42,6 +42,11 @@ typedef struct BMDMAState {
 #define TYPE_PCI_IDE "pci-ide"
 OBJECT_DECLARE_SIMPLE_TYPE(PCIIDEState, PCI_IDE)
 
+enum {
+    PCI_IDE_SECONDARY, /* used only for cmd646 */
+    PCI_IDE_LEGACY_MODE
+};
+
 struct PCIIDEState {
     /*< private >*/
     PCIDevice parent_obj;
@@ -49,7 +54,7 @@ struct PCIIDEState {
 
     IDEBus bus[2];
     BMDMAState bmdma[2];
-    uint32_t secondary; /* used only for cmd646 */
+    uint32_t flags;
     MemoryRegion bmdma_bar;
     MemoryRegion cmd_bar[2];
     MemoryRegion data_bar[2];
diff --git a/hw/ide/cmd646.c b/hw/ide/cmd646.c
index c2546314855..cfea7fca06f 100644
--- a/hw/ide/cmd646.c
+++ b/hw/ide/cmd646.c
@@ -255,8 +255,8 @@ static void pci_cmd646_ide_realize(PCIDevice *dev, Error 
**errp)
 
     pci_conf[PCI_CLASS_PROG] = 0x8f;
 
-    pci_conf[CNTRL] = CNTRL_EN_CH0; // enable IDE0
-    if (d->secondary) {
+    pci_conf[CNTRL] = CNTRL_EN_CH0; /* enable IDE0 */
+    if (d->flags & BIT(PCI_IDE_SECONDARY)) {
         /* XXX: if not enabled, really disable the seconday IDE controller */
         pci_conf[CNTRL] |= CNTRL_EN_CH1; /* enable IDE1 */
     }
@@ -314,7 +314,7 @@ static void pci_cmd646_ide_exitfn(PCIDevice *dev)
 }
 
 static Property cmd646_ide_properties[] = {
-    DEFINE_PROP_UINT32("secondary", PCIIDEState, secondary, 0),
+    DEFINE_PROP_BIT("secondary", PCIIDEState, flags, PCI_IDE_SECONDARY, false),
     DEFINE_PROP_END_OF_LIST(),
 };
 
diff --git a/hw/sparc64/sun4u.c b/hw/sparc64/sun4u.c
index 0fa13a73302..c46baa9f489 100644
--- a/hw/sparc64/sun4u.c
+++ b/hw/sparc64/sun4u.c
@@ -674,7 +674,7 @@ static void sun4uv_init(MemoryRegion *address_space_mem,
     }
 
     pci_dev = pci_new(PCI_DEVFN(3, 0), "cmd646-ide");
-    qdev_prop_set_uint32(&pci_dev->qdev, "secondary", 1);
+    qdev_prop_set_bit(&pci_dev->qdev, "secondary", true);
     pci_realize_and_unref(pci_dev, pci_busA, &error_fatal);
     pci_ide_create_devs(pci_dev);
 
-- 
2.26.2