custom ads8272 board PCI interrupt no response

custom ads8272 board PCI interrupt no response

[Sam Song]

Hi all,

A PCI interrupt probelm confused me when porting
2.6.13-rc3 on a custom 8248 board. There was a 
Gb ethernet RTL8110S on board with IDSEL AD25 and
IRQ3. So I made some changes as follows:

--- linux-2.6.13-rc3/arch/ppc/platforms/pq2ads.h
+++ linux-2.6.13-rc3-sam/arch/ppc/platforms/pq2ads.h
@@ -74,11 +78,11 @@
-#define PCI_INT_TO_SIU 	SIU_INT_IRQ2
+#define PCI_INT_TO_SIU 	SIU_INT_IRQ3

--- linux-2.6.13-rc3/arch/ppc/syslib/m82xx_pci.c
+++ linux-2.6.13-rc3-sam/arch/ppc/syslib/m82xx_pci.c
@@ -60,12 +60,20 @@
      * 	  A      B      C      D
      */
      {
+#if 0
    { PIRQA, PIRQB, PIRQC, PIRQD },/* IDSEL 22 - PCI 
slot 0 */
    { PIRQD, PIRQA, PIRQB, PIRQC }, /* IDSEL 23 - PCI 
slot 1 */
    { PIRQC, PIRQD, PIRQA, PIRQB }, /* IDSEL 24 - PCI 
slot 2 */
+#else  
+ {22, 22, 22, 22},/* IDSEL 22/IRQ4-PCI slot 0-USB */
+ {23, 23, 23, 23},/* IDSEL 23/IRQ5-PCI slot 1-IDE */
+ {24, 24, 0,   0},/* IDSEL 24 - PCI slot # - NULL */
+ {25, 25, 25, 25},/* IDSEL 25/IRQ3-PCI slot 2- Gb */
+
+#endif
    };
- const long min_idsel = 22, max_idsel = 24, 
irqs_per_slot = 4;
+ const long min_idsel = 22, max_idsel = 25, 
irqs_per_slot = 4;

Then got a interrupt map:
# cat /proc/interrupts
        CPU0
 21:     0   CPM2 SIU  Level    PQ2 PCI cascade
 25:     0   CPM2 SIU  Level    eth0
 40:    14   CPM2 SIU  Level    cpm_uart
 BAD:    2

Gb interrupt remained unchangable in the whole test
process. I could ping target itself but not for 
outside machine. So I suspect this result was due to
PCI interrupt setting but don't know where the probelm
is. Any idea?

Thanks in advance,

Sam


	

	
		
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Re : custom ads8272 board PCI interrupt no response

[Sam Song]

Sam Song <samlinuxppc@yahoo.com.cn> wrote:
> Hi all,
> 
> A PCI interrupt probelm confused me when porting
> 2.6.13-rc3 on a custom 8248 board. There was a 
> Gb ethernet RTL8110S on board with IDSEL AD25 and
> IRQ3. So I made some changes as follows:
> 
> --- linux-2.6.13-rc3/arch/ppc/platforms/pq2ads.h
> +++ linux-2.6.13-rc3-sam/arch/ppc/platforms/pq2ads.h
> @@ -74,11 +78,11 @@
> -#define PCI_INT_TO_SIU 	SIU_INT_IRQ2
> +#define PCI_INT_TO_SIU 	SIU_INT_IRQ3

Ummm, not the case. ADS8272 uses a CPLD PCI interrupt
controller which takes up IRQ2. No need to me:-)

> --- linux-2.6.13-rc3/arch/ppc/syslib/m82xx_pci.c
> +++ linux-2.6.13-rc3-sam/arch/ppc/syslib/m82xx_pci.c
> @@ -60,12 +60,20 @@
>       * 	  A      B      C      D
>       */
>       {
> +#if 0
>     { PIRQA, PIRQB, PIRQC, PIRQD },/* IDSEL 22 - PCI
> 
> slot 0 */
>     { PIRQD, PIRQA, PIRQB, PIRQC }, /* IDSEL 23 -
> PCI 
> slot 1 */
>     { PIRQC, PIRQD, PIRQA, PIRQB }, /* IDSEL 24 -
> PCI 
> slot 2 */
> +#else  
> + {22, 22, 22, 22},/* IDSEL 22/IRQ4-PCI slot 0-USB
> */
> + {23, 23, 23, 23},/* IDSEL 23/IRQ5-PCI slot 1-IDE
> */
> + {24, 24, 0,   0},/* IDSEL 24 - PCI slot # - NULL
> */
> + {25, 25, 25, 25},/* IDSEL 25/IRQ3-PCI slot 2- Gb
> */

Set IRQ3 in the last line as 21 to assign the IRQ3
to Gb ethernet.

> Gb interrupt remained unchangable in the whole test
> process. I could ping target itself but not for 
> outside machine. So I suspect this result was due to
> PCI interrupt setting but don't know where the
> probelm is. Any idea?

Well, I finally masked pq2ads interrupt irq init and
adjusted SIUMCR IRQ3 setting correctly. Then 
everything went as smoothly as clockwork.

Sorry to bother here:-)

Sam

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