gpio Interrupt handling for omap5912

gpio Interrupt handling for omap5912

[Arnold]

Hi,

Anybody knows what interrupt number a gpio on omap5912
uses? Is there a specification on gpio interrupt?

Thanks,
OJ


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Re: gpio Interrupt handling for omap5912

[Dirk Behme]

Arnold wrote:
> Anybody knows what interrupt number a gpio on omap5912
> uses?

AFAIK interrupt numbers for GPIO start with 160 and then are 
numbered starting with first GPIO bank and so on.

See include/asm-arm/arch-omap/irqs.h:

#define IH2_BASE           32

/* Max. 128 level 2 IRQs (OMAP1610), 192 GPIOs (OMAP730) and
  * 16 MPUIO lines */
#define OMAP_MAX_GPIO_LINES     192
#define IH_GPIO_BASE            (128 + IH2_BASE)
#define IH_MPUIO_BASE           (OMAP_MAX_GPIO_LINES + 
IH_GPIO_BASE)
#define IH_BOARD_BASE           (16 + IH_MPUIO_BASE)

Have a look to GPIO framework in gpio.c and its usage in 
various files which can help you programming GPIO stuff.

Cheers

Dirk

Re: gpio Interrupt handling for omap5912

[Arnold]

Hi,

I've been playing around the gpio. writing to pins. I
encountered an error that is weird. Im not sure if
this is cause by writing to a gpio. I tried several
gpio pins but I still encountered an error. below is
the error encountered:
# ./gpio_test
Opening gpio driver
(OJ) Writing at pin = 49
(OJ) Value of pin = 1

~ #
~ #
~ #
~ #
~ # ./gpio_test
nfs: server 157.184.66.86 not responding, still trying
NETDEV WATCHDOG: eth0: transmit timed out
NETDEV WATCHDOG: eth0: transmit timed out

Do Anyone knows whats wrong here? I have no idea why
Im encountering this error.

Regards,
OJ


--- Dirk Behme <dirk.behme@googlemail.com> wrote:

> Arnold wrote:
> > Anybody knows what interrupt number a gpio on
> omap5912
> > uses?
> 
> AFAIK interrupt numbers for GPIO start with 160 and
> then are 
> numbered starting with first GPIO bank and so on.
> 
> See include/asm-arm/arch-omap/irqs.h:
> 
> #define IH2_BASE           32
> 
> /* Max. 128 level 2 IRQs (OMAP1610), 192 GPIOs
> (OMAP730) and
>   * 16 MPUIO lines */
> #define OMAP_MAX_GPIO_LINES     192
> #define IH_GPIO_BASE            (128 + IH2_BASE)
> #define IH_MPUIO_BASE           (OMAP_MAX_GPIO_LINES
> + 
> IH_GPIO_BASE)
> #define IH_BOARD_BASE           (16 + IH_MPUIO_BASE)
> 
> Have a look to GPIO framework in gpio.c and its
> usage in 
> various files which can help you programming GPIO
> stuff.
> 
> Cheers
> 
> Dirk
> 


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Re: gpio Interrupt handling for omap5912

[Arnold]

Hi Dirk,

> In your first mail you asked for a description/spec
> how to 
> program GPIO. Maybe you can now write a short howto
> how to 
> program and use GPIO API and send it to the list?
> Then the 
> result of our discussion can be helpful for others
> as well. 
> Giving something back to the community must not be
> code or 
> patches, it can be documentation as well.
 
Here's the a little of what I know on howto for gpio.
There may be an error, so feel free to edit/modify.

GPIO API's How To.

INCLUDE
#include <asm/arch/gpio.h>

I. GPIO Modules/Banks
        A.) GPIO MODULE/BANK 0 - PIN  0-15
        B.) GPIO MODULE/BANK 1 - PIN 16-31
        C.) GPIO MODULE/BANK 2 - PIN 32-47
        D.) GPIO MODULE/BANK 3 - PIN 48-63

II. GPIO API's
A.) omap_request_gpio(int gpio)
     Description:
     Parameter:
     > int gpio - GPIO PIN (Pin 0-63)
     Note:
     >Using this function, you dont have to worry
about
       banks/modules where the gpio pin is.
B.) omap_set_gpio_direction(int gpio, int is_input)
    Description:
     > This function is responsible for setting the
       gpio pin direction(input or output).
    Parameter:
     > int gpio - GPIO PIN (Pin 0-63)
     > int is_input - pin direction (0=output,
1=input)

C.) omap_set_gpio_dataout(int gpio, int enable)
    Description:
     > This function is responsible for writing to a  
                 pin.
    Parameter:
     > int gpio - GPIO PIN (Pin 0-63)
     > int enable - pin value (0 or 1)
D.) omap_get_gpio_datain(int gpio)
    Description:
    > This function is responsible for reading pin
values.
    Parameter:
    > int gpio - GPIO PIN (Pin 0-63)
E.) omap_free_gpio(int gpio)
    Description:
    > This function is responsible for freeing the pin
used.
    Parameter:
    > int gpio - GPIO PIN (Pin 0-63)
F.) OMAP_GPIO_IRQ(int gpio)
    Description:
    > Returns the Interrupt number for the specified
gpio pin.
    Parameter:
    > int gpio - GPIO PIN (Pin 0-63)
G.) set_irq_type(unsigned int irq, unsigned int type)
    Description:
    > This function is responsible for setting the
type of interrupt(RISING or FALLING).
    Parameter:
    > unsigned int irq - The interrupt number for the
gpio pin.
    > unsigned int type - (IRQT_RISING = rising,
IRQT_FALLING= falling)


Example:
1.) Writing to gpio pin#3 a value 1. and reading the
value of gpio pin#3.
        Request for gpio pin
                omap_request_gpio(3);
        Writing a 1 to gpio pin # 3:
                omap_set_gpio_direction(3,0);
                omap_set_set_dataout(3,1);
        Reading the value of pin # 3;
                ret = omap_get_datain(3);
                printk("value of pin # 3 = %d\n",ret);
        Freeing gpio pin # 3;
                omap_free_gpio(3);

2.) Interrupt
        Request for gpio pin
                omap_request_gpio(3);
        Setting up pin for interrupt
         omap_set_gpio_direction(3,0);
         set_irq_type(OMAP_GPIO_IRQ(3),IRQT_RISING);  
    
         request_irq(OMAP_GPIO_IRQ(3),(void
*)&my_int_handler,SA_SHIRQ,....);
        Freeing interrupt and gpio pin
                free_irq(OMAP_GPIO_IRQ(3),&id);
                omap_free_gpio(3);


I dont know if this will help. Thanks for all the
help.

Regards,
OJ




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Re: gpio Interrupt handling for omap5912

[Dirk Behme]

Hi all,

to avoid that things like HowTo below are lost, what do you 
think is the best place to store them?

I can imagine

- Documentation/arm/OMAP/GPIO
- http://tree.celinuxforum.org/CelfPubWiki/OSK
- ?

Cheers

Dirk

Arnold wrote:
> Here's the a little of what I know on howto for gpio.
> There may be an error, so feel free to edit/modify.
> 
> GPIO API's How To.
> 
> INCLUDE
> #include <asm/arch/gpio.h>
> 
> I. GPIO Modules/Banks
>         A.) GPIO MODULE/BANK 0 - PIN  0-15
>         B.) GPIO MODULE/BANK 1 - PIN 16-31
>         C.) GPIO MODULE/BANK 2 - PIN 32-47
>         D.) GPIO MODULE/BANK 3 - PIN 48-63
> 
> II. GPIO API's
> A.) omap_request_gpio(int gpio)
>      Description:
>      Parameter:
>      > int gpio - GPIO PIN (Pin 0-63)
>      Note:
>      >Using this function, you dont have to worry
> about
>        banks/modules where the gpio pin is.
> B.) omap_set_gpio_direction(int gpio, int is_input)
>     Description:
>      > This function is responsible for setting the
>        gpio pin direction(input or output).
>     Parameter:
>      > int gpio - GPIO PIN (Pin 0-63)
>      > int is_input - pin direction (0=output,
> 1=input)
> 
> C.) omap_set_gpio_dataout(int gpio, int enable)
>     Description:
>      > This function is responsible for writing to a  
>                  pin.
>     Parameter:
>      > int gpio - GPIO PIN (Pin 0-63)
>      > int enable - pin value (0 or 1)
> D.) omap_get_gpio_datain(int gpio)
>     Description:
>     > This function is responsible for reading pin
> values.
>     Parameter:
>     > int gpio - GPIO PIN (Pin 0-63)
> E.) omap_free_gpio(int gpio)
>     Description:
>     > This function is responsible for freeing the pin
> used.
>     Parameter:
>     > int gpio - GPIO PIN (Pin 0-63)
> F.) OMAP_GPIO_IRQ(int gpio)
>     Description:
>     > Returns the Interrupt number for the specified
> gpio pin.
>     Parameter:
>     > int gpio - GPIO PIN (Pin 0-63)
> G.) set_irq_type(unsigned int irq, unsigned int type)
>     Description:
>     > This function is responsible for setting the
> type of interrupt(RISING or FALLING).
>     Parameter:
>     > unsigned int irq - The interrupt number for the
> gpio pin.
>     > unsigned int type - (IRQT_RISING = rising,
> IRQT_FALLING= falling)
> 
> 
> Example:
> 1.) Writing to gpio pin#3 a value 1. and reading the
> value of gpio pin#3.
>         Request for gpio pin
>                 omap_request_gpio(3);
>         Writing a 1 to gpio pin # 3:
>                 omap_set_gpio_direction(3,0);
>                 omap_set_set_dataout(3,1);
>         Reading the value of pin # 3;
>                 ret = omap_get_datain(3);
>                 printk("value of pin # 3 = %d\n",ret);
>         Freeing gpio pin # 3;
>                 omap_free_gpio(3);
> 
> 2.) Interrupt
>         Request for gpio pin
>                 omap_request_gpio(3);
>         Setting up pin for interrupt
>          omap_set_gpio_direction(3,0);
>          set_irq_type(OMAP_GPIO_IRQ(3),IRQT_RISING);  
>     
>          request_irq(OMAP_GPIO_IRQ(3),(void
> *)&my_int_handler,SA_SHIRQ,....);
>         Freeing interrupt and gpio pin
>                 free_irq(OMAP_GPIO_IRQ(3),&id);
>                 omap_free_gpio(3);
> 
> 
> I dont know if this will help. Thanks for all the
> help.

Re: gpio Interrupt handling for omap5912

[lamikr]

Dirk Behme wrote:
> Hi all,
>
> to avoid that things like HowTo below are lost, what do you think is
> the best place to store them?
>
> I can imagine
>
> - Documentation/arm/OMAP/GPIO
I would prefer this even it might be even too obvious place to search
this kind of docs :-) But of course OSK wiki is also good location.
Maybe there could also be something from the just added GPIO switch
framework usage and omap platforms it should support. (OMAP1, OMAP2?)

Another area from which I would be interested in would be ARMIOs, as I
have only found my self couple of references to them without good
explanation what they really are. They seems to be something that
remains GPIO's and I would be interested in to know whether GPIO
functions are supposed to handle also them by just using certain high
enought ID numbers, or should they be treated diffrerently?

Mika

Re: gpio Interrupt handling for omap5912

[Dirk Behme]

lamikr wrote:
> Dirk Behme wrote:
>>to avoid that things like HowTo below are lost, what do you think is
>>the best place to store them?
>>
>>I can imagine
>>
>>- Documentation/arm/OMAP/GPIO
> 
> I would prefer this even it might be even too obvious place to search
> this kind of docs :-) But of course OSK wiki is also good location.

Okay, let us put it into Documentation/arm/OMAP (see patch I
sent). If it is there, I will add a link to

http://tree.celinuxforum.org/CelfPubWiki/OSK#head-0bda81ff448870f0aa282eb95524f2c157ca3e83

Then, we have it at both places ;)

> Maybe there could also be something from the just added GPIO switch
> framework usage and omap platforms it should support. (OMAP1, OMAP2?)
> 
> Another area from which I would be interested in would be ARMIOs, as I
> have only found my self couple of references to them without good
> explanation what they really are. They seems to be something that
> remains GPIO's and I would be interested in to know whether GPIO
> functions are supposed to handle also them by just using certain high
> enought ID numbers, or should they be treated diffrerently?

Anybody who is familiar with this can add this info to GPIO
howto?

Thanks

Dirk