Finding Hardware Interrupt Number
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Finding Hardware Interrupt Number
by Fahd Abidi
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I am wondering if
some one can point me in the right direction. We have a platform where we are
using Interrupt Pin 5 on our coldfire MCF5275, we are running a UCLinux kernel
2.4 and I am trying to figure out which IRQ number in the kernel maps to
Hardware Interrupt 5? Is there an easy way to figure this
out?
Thanks,
Fahd Abidi |
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Re: Finding Hardware Interrupt Number
by Marc Vincent-3
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Not familiar with uCLinux' mapping, but I would imagine it aligns its
vectors to the hardware's. EPF5 is source 5 for interrupt controller 0, so the hardware vector is 0x45. Hope this helps. On Mon, Jun 9, 2008 at 11:22 AM, Fahd Abidi <fabidi@...> wrote: > I am wondering if some one can point me in the right direction. We have a > platform where we are using Interrupt Pin 5 on our coldfire MCF5275, we are > running a UCLinux kernel 2.4 and I am trying to figure out which IRQ number > in the kernel maps to Hardware Interrupt 5? Is there an easy way to figure > this out? --- coldfire@... Send a post to the list. coldfire-join@... Join the list. coldfire-digest@... Join the list in digest mode. coldfire-leave@... Leave the list. |
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Re: Finding Hardware Interrupt Number
by Greg Ungerer
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Hi Fahd,
Fahd Abidi wrote: > I am wondering if some one can point me in the right direction. We have > a platform where we are using Interrupt Pin 5 on our coldfire MCF5275, > we are running a UCLinux kernel 2.4 and I am trying to figure out which > IRQ number in the kernel maps to Hardware Interrupt 5? Is there an easy > way to figure this out? The IRQ number that you pass to request_irq() in uClinux is the vector number. So figure out what vector number GPIO5 interrupts on and use that. Regards Greg ------------------------------------------------------------------------ Greg Ungerer -- Chief Software Dude EMAIL: gerg@... Secure Computing Corporation PHONE: +61 7 3435 2888 825 Stanley St, FAX: +61 7 3891 3630 Woolloongabba, QLD, 4102, Australia WEB: http://www.SnapGear.com --- coldfire@... Send a post to the list. coldfire-join@... Join the list. coldfire-digest@... Join the list in digest mode. coldfire-leave@... Leave the list. |
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Re: Finding Hardware Interrupt Number
by Allon Stern
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On Jun 11, 2008, at 2:49 AM, Greg Ungerer wrote: > Hi Fahd, > > Fahd Abidi wrote: >> I am wondering if some one can point me in the right direction. We >> have a platform where we are using Interrupt Pin 5 on our coldfire >> MCF5275, we are running a UCLinux kernel 2.4 and I am trying to >> figure out which IRQ number in the kernel maps to Hardware >> Interrupt 5? Is there an easy way to figure this out? > > The IRQ number that you pass to request_irq() in uClinux is the > vector number. So figure out what vector number GPIO5 interrupts on > and use that. One potential gotcha - at least it got me on the 5282; I don't know how this maps to the 5275: I had to set up the hardware to enable interrupts on the IRQ line (EPIER register) and unmask the interrupt (IMRL register). Once those were done, I could request_irq. In my linux environment (2.6), the interrupt# was IH_GPIO_BASE+4 (for IRQ pin 4) Hope this helps. - allon --- coldfire@... Send a post to the list. coldfire-join@... Join the list. coldfire-digest@... Join the list in digest mode. coldfire-leave@... Leave the list. |
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Re: Finding Hardware Interrupt Number
by Allon Stern
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On Jun 11, 2008, at 11:34 AM, Allon Stern wrote: > In my linux environment (2.6), the interrupt# was IH_GPIO_BASE+4 > (for IRQ pin 4) Whoops, that was on the OMAP. Dang #ifdefs! On the Coldfire, it was 64+7 for IRQ pin 7. Sorry for any confusion. - allon --- coldfire@... Send a post to the list. coldfire-join@... Join the list. coldfire-digest@... Join the list in digest mode. coldfire-leave@... Leave the list. |
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Re: Finding Hardware Interrupt Number
by Allon Stern
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On Jun 12, 2008, at 4:14 PM, Fahd Abidi wrote:
As I noted in my earlier email, I did need to do this on the 5282. My code looks like this (NOTE: ON 5282!) /* We have to set up the edge port module to source interrupts from the IRQ line */ *MCF5282_EPORT_EPIER = 0xFE; // bit #7; enable interrupts on IRQ 7 *(u32 *)(MCF5282_INTC0+MCFINTC_IMRL) &= ~0x00000080; // unmask IRQ7 interrupt HTH. - allon
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Re: Finding Hardware Interrupt Number
by Kurt Mahan
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Have you setup the EPORT regs? The first 7 ints are EPORT ints that
usually require a little more configuration than just registering for the int. Just a thought. --Kurt Fahd Abidi wrote: > Well looks like all is not working as expected. I checked the hardware > and see the interrupts trigger on Interrupt Pin 5 using an oscope > measuring the resistor connected to that pin. I fired 5 interrupts just > to be sure and can capture them on the oscopse how ever I don't see the > interrupts trigger in the kernel: > > # cat /proc/interrupts > 69: 0 MCP2515 > 77: 7528 ColdFire UART > Starting > 78: 0 ColdFire UART > d.en > . > . > . > . > > Interrupt 69 did not trigger as shown above. I assumed that the all the > interrupt sources should be enabled in the uClinux kernel, is this > correct to assume? Or do I need to modify the kernel to enable disable > the interrupt thru the interrupt mask register? Does any one know where > this needs to be done, or if it needs to be done? > > Thanks, > > Fahd Abidi > > > -----Original Message----- > From: coldfire-bounce@... [mailto:coldfire-bounce@...] > On Behalf Of Fahd Abidi > Sent: Wednesday, June 11, 2008 1:01 PM > To: Fahd Abidi > Subject: RE: [ColdFire] Finding Hardware Interrupt Number > > Looking at include/asm-m68knommu/m527xsim.h the ICR base is set to 0x40. > And since I am using IRQ pin 5 this would mean that interrupt vector > would be 0x45? I think. Which is 69, this matched what Marc has > mentioned and also seems to match your IRQ offsets, so I mmight have it. > I'm still new to this and learning. > > Thanks for all the help! > > Fahd Abidi > > -----Original Message----- > From: coldfire-bounce@... [mailto:coldfire-bounce@...] > On Behalf Of Allon Stern > Sent: Wednesday, June 11, 2008 12:01 PM > To: Fahd Abidi > Subject: Re: [ColdFire] Finding Hardware Interrupt Number > > > On Jun 11, 2008, at 11:34 AM, Allon Stern wrote: > > >> In my linux environment (2.6), the interrupt# was IH_GPIO_BASE+4 (for >> IRQ pin 4) >> > > Whoops, that was on the OMAP. Dang #ifdefs! > > On the Coldfire, it was 64+7 for IRQ pin 7. Sorry for any confusion. > > - > allon > --- > coldfire@... Send a post to the list. > coldfire-join@... Join the list. > coldfire-digest@... Join the list in digest mode. > coldfire-leave@... Leave the list. > > > > --- > coldfire@... Send a post to the list. > coldfire-join@... Join the list. > coldfire-digest@... Join the list in digest mode. > coldfire-leave@... Leave the list. > > > > > --- > coldfire@... Send a post to the list. > coldfire-join@... Join the list. > coldfire-digest@... Join the list in digest mode. > coldfire-leave@... Leave the list. > > --- coldfire@... Send a post to the list. coldfire-join@... Join the list. coldfire-digest@... Join the list in digest mode. coldfire-leave@... Leave the list. |
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