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List:       linux-arm-kernel
Subject:    Re: pxa270 & request_irq troubles
From:       Palo Revak <palo () bielyvlk ! sk>
Date:       2008-01-24 14:58:25
Message-ID: 200801241558.25239.palo () bielyvlk ! sk
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YES,,,
	BTMCR |= MCR_OUT2;
if it is not set, interrupts are disabled in non loop mode!!!
regards :)

On Thursday 24 January 2008 01:18:02 Palo Revak wrote:
> I making my own serial driver with RS485 support as kernel module.
> (in userspace it is not suitable, because it is not a realtime.. and I need
> very fast response during arbitrage and after sending...)
> for communication is used BTUART, this serial port is configured as
> following:
>
> 	BTLCR = LCR_DLAB;
> 	BTDLL = 16;	// 57600
> 	BTDLH = 0;
> 	BTLCR = LCR_WLS1 | LCR_WLS0;	// 8bits
> 	BTIER = IER_UUE | IER_TIE | IER_RAVIE;
>
> at this time is all features disabled (like FIFO, ...) except IRQ (only
> very basic settings)
> after I configure an interrupt:
>
> 	return = request_irq(IRQ_BTUART, rs485_irq, 0, "rs485", NULL);
>
> this is OK (return == 0)
> if I try to send any data like:
>
> 	BTTHR = 0x55;
>
> the data are transmitted correctly...
> only my rs485_irq handler is newer called.
>
> in file: /proc/interrupts
>            CPU0
>   3:         24          SC  ohci_hcd:usb1
>   8:          0      GPIO-l  MMC card detect
>  17:          1          SC  LCD
>  21:          0          SC  rs485
>  22:        807          SC  FFUART
>  23:         11          SC  pxa2xx-mci
>  25:          0          SC  DMA
>  26:      36307          SC  ost0
> 178:      16560        GPIO  eth0
> Err:          0
>
> according to datasheet, registers for BTUART are sets OK
> also I try to exchange irq to 9 (GPIO1) and if I change this signal, my
> handler is called correctly.
> I try to remove support for BTUART from pxa270.c, and still nothing.
> if I keep BTUART support in kernel, any sending/receiving is OK and include
> interrupt calling.
>
> I doing something wrong ? I'm from this already miserable :(
> thanks for any ideas.

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