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Re: [PATCH -queue 1/2] [loongson] add basic loongson-2f support

To: Wu Zhangjin <>
Subject: Re: [PATCH -queue 1/2] [loongson] add basic loongson-2f support
From: Ralf Baechle <>
Date: Fri, 6 Nov 2009 14:14:05 +0100
In-reply-to: <>
Original-recipient: rfc822;
References: <> <>
User-agent: Mutt/1.5.19 (2009-01-05)
On Fri, Nov 06, 2009 at 06:45:05PM +0800, Wu Zhangjin wrote:

> Loongson2F has built-in DDR2 and PCIX controller. The PCIX controller
> have a similar programming interface with FPGA northbridge used in
> Loongson2E.
> The main differences between loongson-2e and loongson-2f include:
> 1. loongson-2f has an extra address windows configuration module, which
> can be used to map CPU address space to DDR or PCI address space, or map
> the PCI-DMA address space to DDR or LIO address space.
> 2. loongson-2f support 8 levels of software configurable cpu frequency,
> which can be configured via a register(LOONGSON_CHIPCFG0).  the coming
> cpufreq and standby support are based on this feature.
> herein, the module and the corresponding operations are abstracted to
> loongson.h.
> besides, the other loongson2f-specific source code are added here,
> including gcc 4.4 support, pci memory space, pci io space, dma address.

Queued for 2.6.33.  Thanks!


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