[PATCH v4 0/3] hw/usb/vt82c686-uhci-pci: Use ISA instead of PCI interrupts

[PATCH v4 0/3] hw/usb/vt82c686-uhci-pci: Use ISA instead of PCI interrupts

[BALATON Zoltan]

v4 splits up the single patch into a series

BALATON Zoltan (3):
  usb/uhci: Misc clean up
  usb/uhci: Replace pci_set_irq with qemu_set_irq
  hw/usb/vt82c686-uhci-pci: Use ISA instead of PCI interrupts

 hw/usb/hcd-uhci.c          | 11 +++++------
 hw/usb/hcd-uhci.h          |  2 +-
 hw/usb/vt82c686-uhci-pci.c | 12 ++++++++++++
 3 files changed, 18 insertions(+), 7 deletions(-)

-- 
2.21.4

[PATCH v4 2/3] usb/uhci: Replace pci_set_irq with qemu_set_irq

[BALATON Zoltan]

Instead of using pci_set_irq, store the irq in the device state and
use it explicitly so variants having different interrupt handling can
use their own.

Signed-off-by: BALATON Zoltan <balaton@eik.bme.hu>
---
 hw/usb/hcd-uhci.c | 4 +++-
 hw/usb/hcd-uhci.h | 2 +-
 2 files changed, 4 insertions(+), 2 deletions(-)

diff --git a/hw/usb/hcd-uhci.c b/hw/usb/hcd-uhci.c
index c557566ec2..7201cd0ae7 100644
--- a/hw/usb/hcd-uhci.c
+++ b/hw/usb/hcd-uhci.c
@@ -31,6 +31,7 @@
 #include "hw/usb/uhci-regs.h"
 #include "migration/vmstate.h"
 #include "hw/pci/pci.h"
+#include "hw/irq.h"
 #include "hw/qdev-properties.h"
 #include "qapi/error.h"
 #include "qemu/timer.h"
@@ -299,7 +300,7 @@ static void uhci_update_irq(UHCIState *s)
         (s->status & UHCI_STS_HCPERR)) {
         level = 1;
     }
-    pci_set_irq(&s->dev, level);
+    qemu_set_irq(s->irq, level);
 }
 
 static void uhci_reset(DeviceState *dev)
@@ -1170,6 +1171,7 @@ void usb_uhci_common_realize(PCIDevice *dev, Error **errp)
     /* TODO: reset value should be 0. */
     pci_conf[USB_SBRN] = USB_RELEASE_1; /* release number */
     pci_config_set_interrupt_pin(pci_conf, u->info.irq_pin + 1);
+    s->irq = pci_allocate_irq(dev);
 
     if (s->masterbus) {
         USBPort *ports[NB_PORTS];
diff --git a/hw/usb/hcd-uhci.h b/hw/usb/hcd-uhci.h
index e61d8fcb19..1f8ee04186 100644
--- a/hw/usb/hcd-uhci.h
+++ b/hw/usb/hcd-uhci.h
@@ -60,7 +60,7 @@ typedef struct UHCIState {
     uint32_t frame_bandwidth;
     bool completions_only;
     UHCIPort ports[NB_PORTS];
-
+    qemu_irq irq;
     /* Interrupts that should be raised at the end of the current frame.  */
     uint32_t pending_int_mask;
 
-- 
2.21.4

[PATCH v4 3/3] hw/usb/vt82c686-uhci-pci: Use ISA instead of PCI interrupts

[BALATON Zoltan]

This device is part of a superio/ISA bridge chip and IRQs from it are
routed to an ISA interrupt set by the Interrupt Line PCI config
register. Implement this in a vt82c686-uhci-pci specific irq handler.

Signed-off-by: BALATON Zoltan <balaton@eik.bme.hu>
Reviewed-by: Jiaxun Yang <jiaxun.yang@flygoat.com>
---
 hw/usb/vt82c686-uhci-pci.c | 12 ++++++++++++
 1 file changed, 12 insertions(+)

diff --git a/hw/usb/vt82c686-uhci-pci.c b/hw/usb/vt82c686-uhci-pci.c
index b109c21603..e70e739409 100644
--- a/hw/usb/vt82c686-uhci-pci.c
+++ b/hw/usb/vt82c686-uhci-pci.c
@@ -1,6 +1,16 @@
 #include "qemu/osdep.h"
+#include "hw/irq.h"
 #include "hcd-uhci.h"
 
+static void uhci_isa_set_irq(void *opaque, int irq_num, int level)
+{
+    UHCIState *s = opaque;
+    uint8_t irq = pci_get_byte(s->dev.config + PCI_INTERRUPT_LINE);
+    if (irq > 0 && irq < 15) {
+        qemu_set_irq(isa_get_irq(NULL, irq), level);
+    }
+}
+
 static void usb_uhci_vt82c686b_realize(PCIDevice *dev, Error **errp)
 {
     UHCIState *s = UHCI(dev);
@@ -14,6 +24,8 @@ static void usb_uhci_vt82c686b_realize(PCIDevice *dev, Error **errp)
     pci_set_long(pci_conf + 0xc0, 0x00002000);
 
     usb_uhci_common_realize(dev, errp);
+    object_unref(s->irq);
+    s->irq = qemu_allocate_irq(uhci_isa_set_irq, s, 0);
 }
 
 static UHCIInfo uhci_info[] = {
-- 
2.21.4

[PATCH v4 1/3] usb/uhci: Misc clean up

[BALATON Zoltan]

Fix a comment for coding style so subsequent patch will not get
checkpatch error and simplify and shorten uhci_update_irq().

Signed-off-by: BALATON Zoltan <balaton@eik.bme.hu>
---
 hw/usb/hcd-uhci.c | 7 ++-----
 1 file changed, 2 insertions(+), 5 deletions(-)

diff --git a/hw/usb/hcd-uhci.c b/hw/usb/hcd-uhci.c
index 0cb02a6432..c557566ec2 100644
--- a/hw/usb/hcd-uhci.c
+++ b/hw/usb/hcd-uhci.c
@@ -290,7 +290,7 @@ static UHCIAsync *uhci_async_find_td(UHCIState *s, uint32_t td_addr)
 
 static void uhci_update_irq(UHCIState *s)
 {
-    int level;
+    int level = 0;
     if (((s->status2 & 1) && (s->intr & (1 << 2))) ||
         ((s->status2 & 2) && (s->intr & (1 << 3))) ||
         ((s->status & UHCI_STS_USBERR) && (s->intr & (1 << 0))) ||
@@ -298,8 +298,6 @@ static void uhci_update_irq(UHCIState *s)
         (s->status & UHCI_STS_HSERR) ||
         (s->status & UHCI_STS_HCPERR)) {
         level = 1;
-    } else {
-        level = 0;
     }
     pci_set_irq(&s->dev, level);
 }
@@ -1170,8 +1168,7 @@ void usb_uhci_common_realize(PCIDevice *dev, Error **errp)
 
     pci_conf[PCI_CLASS_PROG] = 0x00;
     /* TODO: reset value should be 0. */
-    pci_conf[USB_SBRN] = USB_RELEASE_1; // release number
-
+    pci_conf[USB_SBRN] = USB_RELEASE_1; /* release number */
     pci_config_set_interrupt_pin(pci_conf, u->info.irq_pin + 1);
 
     if (s->masterbus) {
-- 
2.21.4

Re: [PATCH v4 1/3] usb/uhci: Misc clean up

[Philippe Mathieu-Daudé]

On 10/14/21 19:32, BALATON Zoltan wrote:
> Fix a comment for coding style so subsequent patch will not get
> checkpatch error and simplify and shorten uhci_update_irq().
> 
> Signed-off-by: BALATON Zoltan <balaton@eik.bme.hu>
> ---
>  hw/usb/hcd-uhci.c | 7 ++-----
>  1 file changed, 2 insertions(+), 5 deletions(-)

Reviewed-by: Philippe Mathieu-Daudé <f4bug@amsat.org>

Re: [PATCH v4 0/3] hw/usb/vt82c686-uhci-pci: Use ISA instead of PCI interrupts

[Gerd Hoffmann]

On Thu, Oct 14, 2021 at 07:32:26PM +0200, BALATON Zoltan wrote:
> v4 splits up the single patch into a series
> 
> BALATON Zoltan (3):
>   usb/uhci: Misc clean up
>   usb/uhci: Replace pci_set_irq with qemu_set_irq
>   hw/usb/vt82c686-uhci-pci: Use ISA instead of PCI interrupts
> 
>  hw/usb/hcd-uhci.c          | 11 +++++------
>  hw/usb/hcd-uhci.h          |  2 +-
>  hw/usb/vt82c686-uhci-pci.c | 12 ++++++++++++
>  3 files changed, 18 insertions(+), 7 deletions(-)

Reviewed-by: Gerd Hoffmann <kraxel@redhat.com>