Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1755169AbZKDK2o (ORCPT ); Wed, 4 Nov 2009 05:28:44 -0500 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1752503AbZKDK2n (ORCPT ); Wed, 4 Nov 2009 05:28:43 -0500 Received: from mx1.moondrake.net ([212.85.150.166]:60033 "EHLO mx1.mandriva.com" rhost-flags-OK-OK-OK-FAIL) by vger.kernel.org with ESMTP id S1751426AbZKDK2n (ORCPT ); Wed, 4 Nov 2009 05:28:43 -0500 X-Spam-Virus: No From: Arnaud Patard To: Wu Zhangjin Cc: Ralf Baechle , linux-mips@linux-mips.org, LKML , huhb@lemote.com, yanh@lemote.com, Zhang Le , Thomas Gleixner , Nicholas Mc Guire , zhangfx@lemote.com, liujl@lemote.com Subject: Re: [PATCH -queue v0 1/6] [loongson] add basic loongson-2f support References: Organization: Mandriva Date: Wed, 04 Nov 2009 11:28:59 +0100 In-Reply-To: (Wu Zhangjin's message of "Wed, 4 Nov 2009 17:04:47 +0800") Message-ID: User-Agent: Gnus/5.1008 (Gnus v5.10.8) Emacs/22.1 (gnu/linux) MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 3066 Lines: 75 Hi, Wu Zhangjin writes: > 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. > > Signed-off-by: Wu Zhangjin > --- > arch/mips/Kconfig | 18 ++++ > arch/mips/Makefile | 2 + > .../mips/include/asm/mach-loongson/dma-coherence.h | 4 + > arch/mips/include/asm/mach-loongson/loongson.h | 84 +++++++++++++++++++- > arch/mips/include/asm/mach-loongson/mem.h | 25 ++++-- > arch/mips/include/asm/mach-loongson/pci.h | 28 ++++++- > arch/mips/loongson/common/bonito-irq.c | 5 + > arch/mips/loongson/common/init.c | 18 ++++ > arch/mips/loongson/common/mem.c | 17 ++++ > arch/mips/loongson/common/pci.c | 8 ++ > 10 files changed, 199 insertions(+), 10 deletions(-) > > diff --git a/arch/mips/Kconfig b/arch/mips/Kconfig > index ae9fa98..8417357 100644 > --- a/arch/mips/Kconfig > +++ b/arch/mips/Kconfig > @@ -1059,6 +1059,21 @@ config CPU_LOONGSON2E > The Loongson 2E processor implements the MIPS III instruction set > with many extensions. > > + It has an internal FPGA northbridge, which is compatiable to > + bonito64. > + > +config CPU_LOONGSON2F > + bool "Loongson 2F" > + depends on SYS_HAS_CPU_LOONGSON2F > + select CPU_LOONGSON2 > + help > + The Loongson 2F processor implements the MIPS III instruction set > + with many extensions. > + > + Loongson2F have built-in DDR2 and PCIX controller. The PCIX controller > + have a similar programming interface with FPGA northbridge used in > + Loongson2E. > + Small question : Why don't you restrict to 64bit kernels only ? From what I remember from some discussions with ST, trying to use a 32-bit kernel on 2f is a nice way to get troubles. It would be better imho to forbid such a configuration. As a side effect, this will remove all 'defined(CONFIG_64BIT)' parts of your #ifdef tests. Arnaud -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/