http://www.xml.com/ldd/chapter/book/ch13.html search for ioermap in this web page
hope this helps
rm
From: "Guangxing Zhang" <guangxing@ict.ac.cn>
To: invictus rm <invictus_rm@hotmail.com>
CC: linux-mips@linux-mips.org <linux-mips@linux-mips.org>, angela <jhyang@ict.ac.cn>, Fuxin Zhang <fxzhang@ict.ac.cn>
Subject: Re: Re: help, question on pci communication!
Date: Thu, 25 Sep 2003 9:41:35 +0800
Hi, invictus rm
Thank you very much for your enthusiastic help.
I think it will be BIG help to me.Thank you.
There is some thing i want to see your advise and help again.
In BCM1250 we run the mips-linux which is customer compiled by us,
and in the MCP750 there is linux too.What i want to implement is
transfering data from BCM1250 to MCP750 through PCI.And using "dmesg"
i found the following info:(In BCM1250 ,MIPS-LINUX)
---------------------------------------------------------------------------------------------------------------------
.............
Jan 1 00:00:11 (none) kernel: Determined physical RAM map:
Jan 1 00:00:11 (none) kernel: memory: 003a7000 @ 00000000 (usable)
Jan 1 00:00:11 (none) kernel: memory: 0f711000 @ 0075c000 (usable)
Jan 1 00:00:11 (none) kernel: memory: 1ffffe00 @ 80000000 (usable)
Jan 1 00:00:11 (none) kernel: memory: 0ffffe00 @ c0000000 (usable)
Jan 1 00:00:11 (none) kernel: memory: 003b5000 @ 003a7000 (reserved)
Jan 1 00:00:11 (none) kernel: 2815MB HIGHMEM available.
Jan 1 00:00:11 (none) kernel: Initial ramdisk at: 0x803a7000 (3887104 bytes)
Jan 1 00:00:11 (none) kernel: On node 0 totalpages: 851967
Jan 1 00:00:11 (none) kernel: zone(0): 131072 pages.
Jan 1 00:00:11 (none) kernel: zone(1): 0 pages.
Jan 1 00:00:11 (none) kernel: zone(2): 720895 pages.
@ Jan 1 00:00:11 (none) kernel: Kernel command line: root=/dev/ram0 rw bigphysarea=8192 pcisharesize=16
@ Jan 1 00:00:11 (none) kernel: pcisharemem allocated @ 85800000
...................
---------------------------------------------------------------------------------------------------------------------
In the above lines tagged with @ i notice that there is "bigphysarea=8192 pcisharesize=16",
I have read "kernel/include/linux/mm/bigphysarea.h" ,and known that bigphysarea can be used
to reserve some amount of physical memory at boot-time for PCI communication.A friend told me
using it is simple ,but he did not tell me kow :-)~(Of course i think he knows it from others).
And i think in my kernel module i can implement it.Without any knowledge on it ,I am swamped now.
Can you give me some info on how to do that ,such as how to use the "bigphysarea"?How the MCP750
see the "bigphysarea" in BCM1250 and access it (read it)?
I think i am so avaricious , but i really thirst for the help and advice.
Thank you again and in advance again.:-)~
======= invictus_rm@hotmail.com 2003-09-24 23:15:00 WROTE£º=======
>hi,
>
> If the BCM1250 is operating in the device mode in the peripheral slot of
>the CPCI chassis, u need t get the enumeration of the PCI being done from
>MCP 750 right.
> The code for MCP750 alread exists in the linux kernel ( if i remember
>correctly).
>
>U can proceed in the following directions-->
>(a) Get the PCI enumeration working properly on the MCP750 ( look at the
>ouput of lspci -vvv to decide whether resource allocation is proper or not)
>.. The powerpc provides a fairly comprehensive PCI enumeration code(
>including scanning beyond the bridge).
>
>(b) Once u are able to see ur device in the lspci output on the MCP board ,
>u can load the driver ( ur custom driver ) to do the transfer from the
>BCM1250 to MCP and vice versa.
>
>(v) Look at the few PCI based drivers about the way the data transfers is
>handled specially pci_alloc_* / pci_map_*/pci_resource_*.........
>
>Hope this helps
>
>
>
>
>>From: "Guangxing Zhang" <guangxing@ict.ac.cn>
>>To: Fuxin Zhang <fxzhang@ict.ac.cn>
>>CC: linux-mips@linux-mips.org <linux-mips@linux-mips.org>, angela
>><jhyang@ict.ac.cn>
>>Subject: help, question on pci communication!
>>Date: Wed, 24 Sep 2003 16:29:32 +0800
>>
>>Hi, Fuxin and everyone see this mail,
>> In linux world ,newbies always like to ask and the veterans will
>>always be enthusiastic.:)~~
>> Now there is a "ask", of course i am a newbie.
>> Follow is the architecture which we are working on.
>> Now i want to transfer the data from the "sb1250" to mcp750 through
>>the PCI bus with the help of 21555 bridge.
>>I want to implement it in kernel module.Although knowing "use the force
>>,read source",but i really do not know
>>how and where to begin.
>> Is there any advice on it ? How to implement the communication through
>>PCI (or PCI-to-PCI bridge) in kernel
>>moudle?
>> Any help will be appreciated!Thank in advance!
>>
>> -------------
>> | MCP 750 | (Power PC)
>> -------------
>> |
>>¡¡ -------------------------------------------CPCI
>> |
>> ---------------|--------------------------------
>> | --------|----- |
>> | |Intel 21555 |(PCI-TO-PCI Bridge) |
>> | -------------- |
>> | | |
>> | --------(PCI bus) |
>> | | |
>> | -------- |
>> | |SB1250|(CPU) |
>> | -------- |
>> ----------------------------------------------
>>¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡Guangxing Zhang
>>¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡guangxing@ict.ac.cn
>> 2003-09-24 16:03:04
>>¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡
>>
>>
>>
>>
>
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¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡Guangxing Zhang ¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡guangxing@ict.ac.cn ¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡2003-09-25 08:43:44
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