From: Michal Simek <monstr@monstr.eu>
To: linux-serial@vger.kernel.org
Cc: Greg Kroah-Hartman <gregkh@suse.de>,
LKML <linux-kernel@vger.kernel.org>,
Peter Korsgaard <jacmet@sunsite.dk>
Subject: Using serial driver 16550A in poll mode without interrupt connected
Date: Wed, 12 Oct 2011 15:03:39 +0200 [thread overview]
Message-ID: <4E95902B.7080204@monstr.eu> (raw)
Hi,
we have internal discussion around serial drivers and their usage without interrupts
in polling mode. It is on FPGA with Microblaze/PPC/ARM and
it is easy for us to have serial IP without IRQ connected to the interrupt controller.
Driver is probed with no IRQ (NO_IRQ = -1 on Microblaze)
83e00000.serial: ttyS0 at MMIO 0x83e01003 (irq = -1) is a 16550A
writing any data to ttyS0 return -1.
Is there any reason no to use driver in poll mode especially for user applications
not for consoles.
Is it possible to use serial driver without IRQ - or blocking IRQ, etc.?
Currently we care about uart16550 and uarlite.
Thanks,
Michal
--
Michal Simek, Ing. (M.Eng)
w: www.monstr.eu p: +42-0-721842854
Maintainer of Linux kernel 2.6 Microblaze Linux - http://www.monstr.eu/fdt/
Microblaze U-BOOT custodian
next reply other threads:[~2011-10-12 13:03 UTC|newest]
Thread overview: 5+ messages / expand[flat|nested] mbox.gz Atom feed top
2011-10-12 13:03 Michal Simek [this message]
2011-10-12 13:51 ` Using serial driver 16550A in poll mode without interrupt connected Alan Cox
2011-10-12 15:19 ` Ted Ts'o
2011-10-13 10:08 ` Michal Simek
2011-10-13 9:56 ` Michal Simek
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