From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from web15915.mail.cnb.yahoo.com (web15915.mail.cnb.yahoo.com [202.165.102.224]) by ozlabs.org (Postfix) with SMTP id CD14BDE336 for ; Fri, 18 Apr 2008 02:51:24 +1000 (EST) Date: Fri, 18 Apr 2008 00:44:43 +0800 (CST) From: =?gb2312?q?=D0=F1=20=C2=DE?= Subject: =?gb2312?q?=BB=D8=B8=B4=A3=BA=20RE:=20A=20question=20about=20the=208250/1?= =?gb2312?q?6550=20Driver?= To: Li Yang , Linu PPC Mail list In-Reply-To: <989B956029373F45A0B8AF02970818900200759C@zch01exm26.fsl.freescale.net> MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="0-1261761823-1208450683=:72220" Message-ID: <58063.72220.qm@web15915.mail.cnb.yahoo.com> List-Id: Linux on PowerPC Developers Mail List List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , --0-1261761823-1208450683=:72220 Content-Type: text/plain; charset=gb2312 Content-Transfer-Encoding: 8bit Hello Leo: Follow your advises, i look the source code and find that you are right. In the source code, There are 2 functions can do some work for the serial port initralization. The code is followed. 1. static int __devinit serial8250_probe(struct platform_device *dev) 2. static void __init serial8250_isa_init_ports(void) In my system i use the function 2 and this function should use the structer old_serial_port. In fact the function 1 can initralize the serial port too. But i don't known how to call this function. For the more, i have find some source code in of_serial.c which is in the \drivers\serial directory. In this file, the function static int __devinit of_platform_serial_probe(struct of_device *ofdev, const struct of_device_id *id) call the serial8250_register_port function to initralized the serial port. This issues makes me puzzlled, Could you help me to analyzed it? and what kind of the function i should used to initralize my serial port. thanks best wishs Li Yang дµÀ£º > -----Original Message----- > From: linuxppc-dev-bounces+leoli=freescale.com@ozlabs.org > [mailto:linuxppc-dev-bounces+leoli=freescale.com@ozlabs.org] > On Behalf Of Ðñ ÂÞ > Sent: Thursday, April 17, 2008 3:32 PM > To: Linu PPC Mail list > Cc: Wood Scott > Subject: A question about the 8250/16550 Driver > > Hello: > I have founded that the serial can't be initialized as > the bootting process. My platform is MPC8313 and my kernel > version is linux-2.6.23.9. I look though the source code and > find that the MPC8313 driver is compatible with 8250/16550. > The driver is in the \drivers\serial\8250.c > > In the function serial8250_isa_init_ports we should use the > structer old_serial_port but i can't find the definition for > this struct. I can only find the following senrense in the > head of this file If you look into the function carefully enough, you can find that old_serial_port is optional and can be empty. It seems to be some leftover to provide backward compatibility when the port structure changed. - Leo --------------------------------- ÑÅ»¢ÓÊÏ䣬ÄúµÄÖÕÉúÓÊÏ䣡 --0-1261761823-1208450683=:72220 Content-Type: text/html; charset=gb2312 Content-Transfer-Encoding: 8bit Hello Leo:
    Follow your advises, i look the source code and find that you are right. In the source code, There are 2 functions can do some work for the serial port initralization. The code is followed.
1. static int __devinit serial8250_probe(struct platform_device *dev)
2. static void __init serial8250_isa_init_ports(void)

In my system i use the function 2 and this function should use the structer old_serial_port.
In fact the function 1 can initralize the serial port too. But i don't known how to call this function.

For the more, i have find some source code in of_serial.c which is in the \drivers\serial directory. In this file, the function
static int __devinit of_platform_serial_probe(struct of_device *ofdev,
                        const struct of_device_id *id)
call the serial8250_register_port function to initralized the serial port.

This issues makes me puzzlled, Could you help me to analyzed it? and what kind of the function i should used to initralize my serial port.



thanks
best wishs

Li Yang <LeoLi@freescale.com> дµÀ£º
> -----Original Message-----
> From: linuxppc-dev-bounces+leoli=freescale.com@ozlabs.org
> [mailto:linuxppc-dev-bounces+leoli=freescale.com@ozlabs.org]
> On Behalf Of Ðñ ÂÞ
> Sent: Thursday, April 17, 2008 3:32 PM
> To: Linu PPC Mail list
> Cc: Wood Scott
> Subject: A question about the 8250/16550 Driver
>
> Hello:
> I have founded that the serial can't be initialized as
> the bootting process. My platform is MPC8313 and my kernel
> version is linux-2.6.23.9. I look though the source code and
> find that the MPC8313 driver is compatible with 8250/16550.
> The driver is in the \drivers\serial\8250.c
>
> In the function serial8250_isa_init_ports we should use the
> structer old_serial_port but i can't find the definition for
> this struct. I can only find the following senrense in the
> head of this file

If you look into the function carefully enough, you can find that old_serial_port is optional and can be empty. It seems to be some leftover to provide backward compatibility when the port structure changed.

- Leo

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