linux-kernel - implementing a custom uart driver

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Message-ID: <549371.88681.qm@web50202.mail.re2.yahoo.com>
Date:	Fri, 11 Dec 2009 14:13:51 -0800 (PST)
From:	raychan <raychan2001@...oo.com>
To:	linux-kernel@...r.kernel.org
Subject: implementing a custom uart driver

Hi all,

    I have been writing a custom uart driver for a SoC. It's not the 8520/16550 flavor so I ended up implementing a struct uart_driver on my own. However I am having some issues on the TX side.

    If I put a printk statement after I enabled TX interrupts then it starts outputting characters. Otherwise the console will just get stuck. It is a memory mapped IO device, it does not support any modem control signals so I simply return TIOM_CTS | TIOCM_DSR | TIOCM_CD in the driver's get_mctrl function. Are there any other caveats that I should be aware of?

Thanks much
Ray


      
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