Re: [Gumstix-users] Chip Select 2 CS2

[Demetris <fgc...@cy...>]

Register the memory space for chip select 2 I use the following code.

int BaseAddr = PXA_CS2_PHYS;

In init function I do the following:

pxa_gpio_mode(GPIO49_nPWE_MD);

pxa_gpio_mode(GPIO78_nCS_2_MD);


/* Registering device */

register_chrdev(major_num, "driver_name",&driver_fops);



In the write function I do the following:

unsigned *device_buffer;

void *ioaddr;

copy_from_user(device_buffer,buf,2);

ioaddr = ioremap(BaseAddr,2);

iowrite16(device__buffer,ioaddr);

wmb();

iounmap(ioaddr);

return 0;

Is this the proper way to map PXA_CS2_PHYS if not is there example or link 
you can refer me to.

No DMA.

----- Original Message ----- 
From: <pa...@pa...>
To: <gum...@li...>
Sent: Thursday, December 28, 2006 7:51 PM
Subject: Re: [Gumstix-users] Chip Select 2 CS2


> Demetris wrote:
>> I'm using the pxa_gpio_mode(GPIO78_nCS_2) to set the gpio mode for CS2 
>> and
>> for base address PXA_CS2_PHYS.
>> When I run the a test user program I don't see any activity on the pin
>> with the osciloscop.
>
> You may need to configure MSC1 and/or SXNCFG too so that the memory
> controller knows the type of bus cycle and timings of your device.
>
> Also, of course, you must map PXA_CS2_PHYS to virtual address space
> (unless you are accessing it with DMA).
>
> Pascal
>
>
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