Hi Stefan, thanks for you reply, as per Amcc 440 ep h/w spec . I can see 10 External interrupts can be configured !! So can i use the GPIO ping mapped to one of these external IRQ's ? Or should the h/w deisgn also support it or is it pure s/w configurations. So i would just like to get an indication via interrupt when status is changed (0/1). I would like to do this is linux.
Are there any reference drivers for this ? how to go about it ? Thanks & Regards Zoolu On Mon, Feb 8, 2010 at 11:43 PM, Stefan Roese <s...@denx.de> wrote: > Hi Zoolu, > > first, this question is not ELDK related. You should send it to Linux-PPC > mailing list instead <linuxppc-...@ozlabs.org>. But still here a few quick > answers/comments. > > On Monday 08 February 2010 17:37:20 Zoolu R wrote: > > We are using a target with AMCC 440ep processor. We need to read the a > GPIO > > pin value in a interrupt mode in linux kernel. Is there some modules > where > > i can refer so some generic implementation(configuring gpio pin as > > inteerupt pin and handlling the same). > > The PPC4xx GPIO support is available in the current Linux kernel. See: > > arch/powerpc/sysdev/ppc4xx_gpio.c > > for more details. Please note that you also need to write a GPIO device > node > in the device tree source (dts) of your Linux port. See this file for > details > in the GPIO node: > > arch/powerpc/boot/dts/warp.dts > > > I would like to detect the dynamic > > value change(0/1) using interrupt and perform isr_call back. Could some > > one show me some pointers. > > So you don't want to use the GPIO pin functionality, but the external > interrupt functionality (the pin functions are multiplexed). You need to > write > a device driver for your custom device. And you need to configure the pin > as > external interrupt and again add a device node including the interrupt > description into your device tree source (dts). > > Cheers, > Stefan > > -- > DENX Software Engineering GmbH, MD: Wolfgang Denk & Detlev Zundel > HRB 165235 Munich, Office: Kirchenstr.5, D-82194 Groebenzell, Germany > Phone: (+49)-8142-66989-0 Fax: (+49)-8142-66989-80 Email: off...@denx.de >
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