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

BALATON Zoltan posted 1 patch 4 years, 4 months ago
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git fetch https://github.com/patchew-project/qemu tags/patchew/20211003161629.614BA745953@zero.eik.bme.hu
Maintainers: Huacai Chen <chenhuacai@kernel.org>, "Philippe Mathieu-Daudé" <f4bug@amsat.org>, Gerd Hoffmann <kraxel@redhat.com>, Jiaxun Yang <jiaxun.yang@flygoat.com>
There is a newer version of this series
hw/usb/hcd-uhci.c          | 12 +++++++++---
hw/usb/hcd-uhci.h          |  1 +
hw/usb/vt82c686-uhci-pci.c |  1 +
3 files changed, 11 insertions(+), 3 deletions(-)
[PATCH] hw/usb/vt82c686-uhci-pci: Use ISA instead of PCI interrupts
Posted by BALATON Zoltan 4 years, 4 months ago 
This device is part of a sperio/ISA bridge chip and IRQs from it are
routed to an ISA interrupt set by the Interrupt Line PCI config
register. Change uhci_update_irq() to allow this and use it from
vt82c686-uhci-pci.

Signed-off-by: BALATON Zoltan <balaton@eik.bme.hu>
---
Maybe bit of a hack but fixes USB interrupts on pegasos2 until
somebody has a better idea. I'm not sure about fuloong2e but the
VT82C686B docs say it also does the same routing IRQs to ISA PIC like
VT8231 used on pegasos2.

 hw/usb/hcd-uhci.c          | 12 +++++++++---
 hw/usb/hcd-uhci.h          |  1 +
 hw/usb/vt82c686-uhci-pci.c |  1 +
 3 files changed, 11 insertions(+), 3 deletions(-)

diff --git a/hw/usb/hcd-uhci.c b/hw/usb/hcd-uhci.c
index 0cb02a6432..8f28241f70 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"
@@ -290,7 +291,7 @@ 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))) ||
@@ -298,10 +299,15 @@ static void uhci_update_irq(UHCIState *s)
         (s->status & UHCI_STS_HSERR) ||
         (s->status & UHCI_STS_HCPERR)) {
         level = 1;
+    }
+    if (s->isa_irqs) {
+        uint8_t irq = pci_get_byte(s->dev.config + PCI_INTERRUPT_LINE);
+        if (irq < ISA_NUM_IRQS) {
+            qemu_set_irq(isa_get_irq(NULL, irq), level);
+        }
     } else {
-        level = 0;
+        pci_set_irq(&s->dev, level);
     }
-    pci_set_irq(&s->dev, level);
 }
 
 static void uhci_reset(DeviceState *dev)
diff --git a/hw/usb/hcd-uhci.h b/hw/usb/hcd-uhci.h
index e61d8fcb19..c91805a65e 100644
--- a/hw/usb/hcd-uhci.h
+++ b/hw/usb/hcd-uhci.h
@@ -59,6 +59,7 @@ typedef struct UHCIState {
     uint32_t frame_bytes;
     uint32_t frame_bandwidth;
     bool completions_only;
+    bool isa_irqs;
     UHCIPort ports[NB_PORTS];
 
     /* Interrupts that should be raised at the end of the current frame.  */
diff --git a/hw/usb/vt82c686-uhci-pci.c b/hw/usb/vt82c686-uhci-pci.c
index b109c21603..5c79e293ef 100644
--- a/hw/usb/vt82c686-uhci-pci.c
+++ b/hw/usb/vt82c686-uhci-pci.c
@@ -13,6 +13,7 @@ static void usb_uhci_vt82c686b_realize(PCIDevice *dev, Error **errp)
     /* USB legacy support  */
     pci_set_long(pci_conf + 0xc0, 0x00002000);
 
+    s->isa_irqs = true;
     usb_uhci_common_realize(dev, errp);
 }
 
-- 
2.21.4
Re: [PATCH] hw/usb/vt82c686-uhci-pci: Use ISA instead of PCI interrupts
Posted by Jiaxun Yang 4 years, 4 months ago 

在 2021/10/3 17:12, BALATON Zoltan 写道:
> This device is part of a sperio/ISA bridge chip and IRQs from it are
> routed to an ISA interrupt set by the Interrupt Line PCI config
> register. Change uhci_update_irq() to allow this and use it from
> vt82c686-uhci-pci.
>
> Signed-off-by: BALATON Zoltan <balaton@eik.bme.hu>
Reviewed-by: Jiaxun Yang <jiaxun.yang@flygoat.com>

Just double checked kernel of fuloong2e which uses this bridge chip and
it's supposed to route UHCI IRQ to i8259.

Thanks.
- Jiaxun

> ---
> Maybe bit of a hack but fixes USB interrupts on pegasos2 until
> somebody has a better idea. I'm not sure about fuloong2e but the
> VT82C686B docs say it also does the same routing IRQs to ISA PIC like
> VT8231 used on pegasos2.
>
>   hw/usb/hcd-uhci.c          | 12 +++++++++---
>   hw/usb/hcd-uhci.h          |  1 +
>   hw/usb/vt82c686-uhci-pci.c |  1 +
>   3 files changed, 11 insertions(+), 3 deletions(-)
>
> diff --git a/hw/usb/hcd-uhci.c b/hw/usb/hcd-uhci.c
> index 0cb02a6432..8f28241f70 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"
> @@ -290,7 +291,7 @@ 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))) ||
> @@ -298,10 +299,15 @@ static void uhci_update_irq(UHCIState *s)
>           (s->status & UHCI_STS_HSERR) ||
>           (s->status & UHCI_STS_HCPERR)) {
>           level = 1;
> +    }
> +    if (s->isa_irqs) {
> +        uint8_t irq = pci_get_byte(s->dev.config + PCI_INTERRUPT_LINE);
> +        if (irq < ISA_NUM_IRQS) {
> +            qemu_set_irq(isa_get_irq(NULL, irq), level);
> +        }
>       } else {
> -        level = 0;
> +        pci_set_irq(&s->dev, level);
>       }
> -    pci_set_irq(&s->dev, level);
>   }
>   
>   static void uhci_reset(DeviceState *dev)
> diff --git a/hw/usb/hcd-uhci.h b/hw/usb/hcd-uhci.h
> index e61d8fcb19..c91805a65e 100644
> --- a/hw/usb/hcd-uhci.h
> +++ b/hw/usb/hcd-uhci.h
> @@ -59,6 +59,7 @@ typedef struct UHCIState {
>       uint32_t frame_bytes;
>       uint32_t frame_bandwidth;
>       bool completions_only;
> +    bool isa_irqs;
>       UHCIPort ports[NB_PORTS];
>   
>       /* Interrupts that should be raised at the end of the current frame.  */
> diff --git a/hw/usb/vt82c686-uhci-pci.c b/hw/usb/vt82c686-uhci-pci.c
> index b109c21603..5c79e293ef 100644
> --- a/hw/usb/vt82c686-uhci-pci.c
> +++ b/hw/usb/vt82c686-uhci-pci.c
> @@ -13,6 +13,7 @@ static void usb_uhci_vt82c686b_realize(PCIDevice *dev, Error **errp)
>       /* USB legacy support  */
>       pci_set_long(pci_conf + 0xc0, 0x00002000);
>   
> +    s->isa_irqs = true;
>       usb_uhci_common_realize(dev, errp);
>   }
>
Re: [PATCH] hw/usb/vt82c686-uhci-pci: Use ISA instead of PCI interrupts
Posted by BALATON Zoltan 4 years, 4 months ago 
On Sun, 3 Oct 2021, BALATON Zoltan wrote:
> This device is part of a sperio/ISA bridge chip and IRQs from it are
> routed to an ISA interrupt set by the Interrupt Line PCI config
> register. Change uhci_update_irq() to allow this and use it from
> vt82c686-uhci-pci.
>
> Signed-off-by: BALATON Zoltan <balaton@eik.bme.hu>
> ---
> Maybe bit of a hack but fixes USB interrupts on pegasos2 until
> somebody has a better idea. I'm not sure about fuloong2e but the
> VT82C686B docs say it also does the same routing IRQs to ISA PIC like
> VT8231 used on pegasos2.

I've found this breaks compilation for machines that have UHCI but no ISA 
so I'll have to cahnge it a bit to put a set_irq method in UHCIState 
instead that subclasses can set then implement the ISA irq mapping in 
vt82c686-uhci-pci.c which depends on VT82C686B which depends on ISA but 
the idea is the same unless somebody comes up with a better one. I'll send 
a v2 later.

Regards,
BALATON Zoltan

> hw/usb/hcd-uhci.c          | 12 +++++++++---
> hw/usb/hcd-uhci.h          |  1 +
> hw/usb/vt82c686-uhci-pci.c |  1 +
> 3 files changed, 11 insertions(+), 3 deletions(-)
>
> diff --git a/hw/usb/hcd-uhci.c b/hw/usb/hcd-uhci.c
> index 0cb02a6432..8f28241f70 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"
> @@ -290,7 +291,7 @@ 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))) ||
> @@ -298,10 +299,15 @@ static void uhci_update_irq(UHCIState *s)
>         (s->status & UHCI_STS_HSERR) ||
>         (s->status & UHCI_STS_HCPERR)) {
>         level = 1;
> +    }
> +    if (s->isa_irqs) {
> +        uint8_t irq = pci_get_byte(s->dev.config + PCI_INTERRUPT_LINE);
> +        if (irq < ISA_NUM_IRQS) {
> +            qemu_set_irq(isa_get_irq(NULL, irq), level);
> +        }
>     } else {
> -        level = 0;
> +        pci_set_irq(&s->dev, level);
>     }
> -    pci_set_irq(&s->dev, level);
> }
>
> static void uhci_reset(DeviceState *dev)
> diff --git a/hw/usb/hcd-uhci.h b/hw/usb/hcd-uhci.h
> index e61d8fcb19..c91805a65e 100644
> --- a/hw/usb/hcd-uhci.h
> +++ b/hw/usb/hcd-uhci.h
> @@ -59,6 +59,7 @@ typedef struct UHCIState {
>     uint32_t frame_bytes;
>     uint32_t frame_bandwidth;
>     bool completions_only;
> +    bool isa_irqs;
>     UHCIPort ports[NB_PORTS];
>
>     /* Interrupts that should be raised at the end of the current frame.  */
> diff --git a/hw/usb/vt82c686-uhci-pci.c b/hw/usb/vt82c686-uhci-pci.c
> index b109c21603..5c79e293ef 100644
> --- a/hw/usb/vt82c686-uhci-pci.c
> +++ b/hw/usb/vt82c686-uhci-pci.c
> @@ -13,6 +13,7 @@ static void usb_uhci_vt82c686b_realize(PCIDevice *dev, Error **errp)
>     /* USB legacy support  */
>     pci_set_long(pci_conf + 0xc0, 0x00002000);
>
> +    s->isa_irqs = true;
>     usb_uhci_common_realize(dev, errp);
> }
>
>

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