[Qemu-devel] [PATCH] mcf: add simr/cimr registers to interrupt controller for 5208

[Qemu-devel] [PATCH] mcf: add simr/cimr registers to interrupt controller for 5208

[Thadeu Lima de Souza Cascardo]

The registers SIMR and CIMR allow interrupts to be masked/unsmasked
without a read-modify-write. Linux m68knommu port uses this for some
platforms. Without this patch, a m5208evb_defconfig won't boot. With
this patch, I could get Linux to boot and get some output in the serial.

Signed-off-by: Thadeu Lima de Souza Cascardo <cascardo@holoscopio.com>
---
 hw/mcf_intc.c |   18 ++++++++++++++++++
 1 files changed, 18 insertions(+), 0 deletions(-)

diff --git a/hw/mcf_intc.c b/hw/mcf_intc.c
index f01bd32..21c0f42 100644
--- a/hw/mcf_intc.c
+++ b/hw/mcf_intc.c
@@ -62,6 +62,10 @@ static uint32_t mcf_intc_read(void *opaque, target_phys_addr_t addr)
         return (uint32_t)(s->ifr >> 32);
     case 0x14:
         return (uint32_t)s->ifr;
+    /* Reading from SIMR and CIMR return 0 */
+    case 0x1c:
+    case 0x1d:
+        return 0;
     case 0xe0: /* SWIACK.  */
         return s->active_vector;
     case 0xe1: case 0xe2: case 0xe3: case 0xe4:
@@ -98,6 +102,20 @@ static void mcf_intc_write(void *opaque, target_phys_addr_t addr, uint32_t val)
     case 0x0c:
         s->imr = (s->imr & 0xffffffff00000000ull) | (uint32_t)val;
         break;
+    /* SIMR allows to easily mask interrupts */
+    case 0x1c:
+        if (val & 0x40)
+            s->imr = ~0ull;
+        else
+            s->imr |= (1 << (val & 0x3f));
+        break;
+    /* CIMR allows to easily unmask interrupts */
+    case 0x1d:
+        if (val & 0x40)
+            s->imr = 0ull;
+        else
+            s->imr &= ~(1 << (val & 0x3f));
+        break;
     default:
         hw_error("mcf_intc_write: Bad write offset %d\n", offset);
         break;
-- 
1.6.6.1

[Qemu-devel] Re: [PATCH] mcf: add simr/cimr registers to interrupt controller for 5208

[Thadeu Lima de Souza Cascardo]

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On Tue, Mar 30, 2010 at 01:58:53PM -0300, Thadeu Lima de Souza Cascardo wrote:
> The registers SIMR and CIMR allow interrupts to be masked/unsmasked
> without a read-modify-write. Linux m68knommu port uses this for some
> platforms. Without this patch, a m5208evb_defconfig won't boot. With
> this patch, I could get Linux to boot and get some output in the serial.
> 
> Signed-off-by: Thadeu Lima de Souza Cascardo <cascardo@holoscopio.com>
> ---

Is there anyone who can take this?

Regards,
Cascardo.

>  hw/mcf_intc.c |   18 ++++++++++++++++++
>  1 files changed, 18 insertions(+), 0 deletions(-)
> 
> diff --git a/hw/mcf_intc.c b/hw/mcf_intc.c
> index f01bd32..21c0f42 100644
> --- a/hw/mcf_intc.c
> +++ b/hw/mcf_intc.c
> @@ -62,6 +62,10 @@ static uint32_t mcf_intc_read(void *opaque, target_phys_addr_t addr)
>          return (uint32_t)(s->ifr >> 32);
>      case 0x14:
>          return (uint32_t)s->ifr;
> +    /* Reading from SIMR and CIMR return 0 */
> +    case 0x1c:
> +    case 0x1d:
> +        return 0;
>      case 0xe0: /* SWIACK.  */
>          return s->active_vector;
>      case 0xe1: case 0xe2: case 0xe3: case 0xe4:
> @@ -98,6 +102,20 @@ static void mcf_intc_write(void *opaque, target_phys_addr_t addr, uint32_t val)
>      case 0x0c:
>          s->imr = (s->imr & 0xffffffff00000000ull) | (uint32_t)val;
>          break;
> +    /* SIMR allows to easily mask interrupts */
> +    case 0x1c:
> +        if (val & 0x40)
> +            s->imr = ~0ull;
> +        else
> +            s->imr |= (1 << (val & 0x3f));
> +        break;
> +    /* CIMR allows to easily unmask interrupts */
> +    case 0x1d:
> +        if (val & 0x40)
> +            s->imr = 0ull;
> +        else
> +            s->imr &= ~(1 << (val & 0x3f));
> +        break;
>      default:
>          hw_error("mcf_intc_write: Bad write offset %d\n", offset);
>          break;
> -- 
> 1.6.6.1
> 

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