From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-5.2 required=3.0 tests=BAYES_00, HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI,NICE_REPLY_A,SPF_HELO_NONE, SPF_PASS,URIBL_BLOCKED,USER_AGENT_SANE_1 autolearn=no autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 724AFC197BF for ; Tue, 8 Dec 2020 00:48:29 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 3180723A04 for ; Tue, 8 Dec 2020 00:48:29 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1728871AbgLHAsO (ORCPT ); Mon, 7 Dec 2020 19:48:14 -0500 Received: from foss.arm.com ([217.140.110.172]:37516 "EHLO foss.arm.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1728852AbgLHAsN (ORCPT ); Mon, 7 Dec 2020 19:48:13 -0500 Received: from usa-sjc-imap-foss1.foss.arm.com (unknown [10.121.207.14]) by usa-sjc-mx-foss1.foss.arm.com (Postfix) with ESMTP id B611730E; Mon, 7 Dec 2020 16:47:27 -0800 (PST) Received: from [192.168.2.22] (unknown [172.31.20.19]) by usa-sjc-imap-foss1.foss.arm.com (Postfix) with ESMTPSA id 2C9783F68F; Mon, 7 Dec 2020 16:47:26 -0800 (PST) Subject: Re: [linux-sunxi] Re: [PATCH 7/8] arm64: dts: allwinner: Add Allwinner H616 .dtsi file To: Chen-Yu Tsai Cc: Samuel Holland , Maxime Ripard , Jernej Skrabec , devicetree , Linus Walleij , linux-kernel , linux-sunxi , Rob Herring , Icenowy Zheng , Yangtao Li , linux-arm-kernel References: <20201202135409.13683-1-andre.przywara@arm.com> <20201202135409.13683-8-andre.przywara@arm.com> <3b4f4bf6-2fba-5d35-bdf5-74b8ced10357@sholland.org> <34e5618e-4a3d-9a46-5077-179c82592fce@arm.com> <3dc67c21-f649-cca5-ec54-c639c54ee56a@arm.com> From: =?UTF-8?Q?Andr=c3=a9_Przywara?= Autocrypt: addr=andre.przywara@arm.com; prefer-encrypt=mutual; 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Message-ID: Date: Tue, 8 Dec 2020 00:47:19 +0000 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:68.0) Gecko/20100101 Thunderbird/68.12.0 MIME-Version: 1.0 In-Reply-To: Content-Type: text/plain; charset=utf-8 Content-Language: en-GB Content-Transfer-Encoding: 8bit Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On 03/12/2020 16:20, Chen-Yu Tsai wrote: Hi, > On Thu, Dec 3, 2020 at 11:45 PM André Przywara wrote: >> >> On 03/12/2020 15:02, Chen-Yu Tsai wrote: >>> On Thu, Dec 3, 2020 at 6:54 PM André Przywara wrote: >>>> >>>> On 03/12/2020 03:16, Samuel Holland wrote: >>>> >>>> Hi, >>>> >>>>> On 12/2/20 7:54 AM, Andre Przywara wrote: >>>>> ... >>>>>> + soc { >>>>>> + compatible = "simple-bus"; >>>>>> + #address-cells = <1>; >>>>>> + #size-cells = <1>; >>>>>> + ranges = <0x0 0x0 0x0 0x40000000>; >>>>>> + >>>>>> + syscon: syscon@3000000 { >>>>>> + compatible = "allwinner,sun50i-h616-system-control", >>>>>> + "allwinner,sun50i-a64-system-control"; >>>>>> + reg = <0x03000000 0x1000>; >>>>>> + #address-cells = <1>; >>>>>> + #size-cells = <1>; >>>>>> + ranges; >>>>>> + >>>>>> + sram_c: sram@28000 { >>>>>> + compatible = "mmio-sram"; >>>>>> + reg = <0x00028000 0x30000>; >>>>>> + #address-cells = <1>; >>>>>> + #size-cells = <1>; >>>>>> + ranges = <0 0x00028000 0x30000>; >>>>>> + }; >>>>>> + >>>>>> + sram_c1: sram@1a00000 { >>>>>> + compatible = "mmio-sram"; >>>>>> + reg = <0x01a00000 0x200000>; >>>>>> + #address-cells = <1>; >>>>>> + #size-cells = <1>; >>>>>> + ranges = <0 0x01a00000 0x200000>; >>>>>> + >>>>>> + ve_sram: sram-section@0 { >>>>>> + compatible = "allwinner,sun50i-h616-sram-c1", >>>>>> + "allwinner,sun4i-a10-sram-c1"; >>>>>> + reg = <0x000000 0x200000>; >>>>>> + }; >>>>>> + }; >>>>>> + }; >>>>> >>>>> You mentioned that you could not find a SRAM A2. How were these SRAM ranges >>>>> verified? If you can load eGON.BT0 larger than 32 KiB, then presumably NBROM >>>>> uses SRAM C, and it is in the manual, but I see no mention of SRAM C1. >>>> >>>> The manual says that SRAM C *can* be used by "the system", at boot time, >>>> as long as it's configured correctly. I couldn't find any details on how >>>> to switch clock sources for SRAM C, and the manual stanza on this is >>>> quite gibberish. I presume it's configured either by BROM or by reset >>>> default this way. I think the idea is that the later users (VE, DE) take >>>> ownership at some point (which means we can't run any firmware in there). >>>> The BSP boot0 is 48KB already, so reaching into SRAM C, and the code >>>> itself heavily uses SRAM C (found by hacking boot0 to drop to FEL and >>>> inspecting the memory afterwards). >>>> >>>> For C1: I copied this name from the H6 .dtsi, the manual calls this >>>> "VE-SRAM", in both manuals, and the description looks identical there >>>> for both SoCs. I think this will be later used by the video engine, so I >>>> kept it in. The large size made me suspicious, and from former >>>> experiments it looks like being aliased to (parts of) SRAM C. >>> >>> I would just call it sram_ve or ve_sram. SRAM C1 would make more sense if >>> it were part of SRAM C, not the other way around. >> >> But isn't that what we do? "sram_c1" is just the node name alias used >> for the parent node. That is actually never referenced anywhere (in any >> of the the H6 .dts), so we can actually remove it, I guess. >> The actual SRAM section is called ve_sram already. > > This is what I had in mind: > > syscon: { > sram_c: sram@28000 { > compatible = "mmio-sram"; > reg = <0x00028000 0x30000>; > #address-cells = <1>; > #size-cells = <1>; > ranges = <0 0x00028000 0x30000>; > > /* starting address might not be correct */ > sram_c_ve: sram-section@0 { > compatible = "allwinner,sun50i-h616-ve-sram-c", > "allwinner,sun4i-a10-sram-c1"; > /* 64 kiB borrowed from ve_sram */ > reg = <0x0 0x10000>; > }; > }; > > ve_sram: sram@1a00000 { > compatible = "mmio-sram"; > reg = <0x01a00000 0x200000>; > #address-cells = <1>; > #size-cells = <1>; > }; > }; OK, I am taking this version, but am dropping the sram_c_ve subnode, until we know where it is, what we actually need and until we can test it. > Another variant, trying to describe the aliasing, though it seems > quite confusing: I don't know the exact nature of the aliasing, only that there is some. > > syscon: { > ve_sram: sram@1a00000 { > compatible = "mmio-sram"; > reg = <0x01a00000 0x200000>; > #address-cells = <1>; > #size-cells = <1>; > ranges; > > ve_sram_c: sram-section@28000 { > compatible = "allwinner,sun50i-h616-ve-sram-c", > "allwinner,sun4i-a10-sram-c1"; > reg = <0x28000 0x10000>; > }; > }; > }; > > > Just out of curiosity, is the whole SRAM @1a00000 accessible by the CPU? I have no clue, but I would guess not, since I doubt that it's actually 2MB in size. I just played around a bit with it from U-Boot, and found strings from the SPL in there. > Does it require the system control SRAM bits to be set, or does that only > affect the portion that SRAM C "borrows"? If it isn't accessible to the > CPU at all, then we might as well not put it in the device tree. Yeah, that's another option I am thinking about. > >> And I can't change the compatible name, for the fallback, at least. >> >> I can make the new compatible string read >> "allwinner,sun50i-h616-ve-sram", if that helps, but that would mean >> deviating from the H6 and other SoCs. > > Matching what the documents say makes more sense to me. I will just delay this decision by not using that string in the first place ;-) Thanks! Andre > > Regards > ChenYu > >> Cheers, >> Andre >> >> >>> >>> Also the sram-section node would make more sense if it were in sram_c, as >>> that is the part that gets switched around, not the full region @ 1a00000. >>> >>> ChenYu >>> >>>> Maybe some guys with more VE knowledge can shine some light on this? >>>> >>>> Cheers, >>>> Andre >>>> >> >> -- >> You received this message because you are subscribed to the Google Groups "linux-sunxi" group. >> To unsubscribe from this group and stop receiving emails from it, send an email to linux-sunxi+unsubscribe@googlegroups.com. >> To view this discussion on the web, visit https://groups.google.com/d/msgid/linux-sunxi/3dc67c21-f649-cca5-ec54-c639c54ee56a%40arm.com. 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Tue, 08 Dec 2020 00:47:33 +0000 Received: from foss.arm.com ([217.140.110.172]) by merlin.infradead.org with esmtp (Exim 4.92.3 #3 (Red Hat Linux)) id 1kmRAB-0008N2-9i for linux-arm-kernel@lists.infradead.org; Tue, 08 Dec 2020 00:47:32 +0000 Received: from usa-sjc-imap-foss1.foss.arm.com (unknown [10.121.207.14]) by usa-sjc-mx-foss1.foss.arm.com (Postfix) with ESMTP id B611730E; Mon, 7 Dec 2020 16:47:27 -0800 (PST) Received: from [192.168.2.22] (unknown [172.31.20.19]) by usa-sjc-imap-foss1.foss.arm.com (Postfix) with ESMTPSA id 2C9783F68F; Mon, 7 Dec 2020 16:47:26 -0800 (PST) Subject: Re: [linux-sunxi] Re: [PATCH 7/8] arm64: dts: allwinner: Add Allwinner H616 .dtsi file To: Chen-Yu Tsai References: <20201202135409.13683-1-andre.przywara@arm.com> <20201202135409.13683-8-andre.przywara@arm.com> <3b4f4bf6-2fba-5d35-bdf5-74b8ced10357@sholland.org> <34e5618e-4a3d-9a46-5077-179c82592fce@arm.com> <3dc67c21-f649-cca5-ec54-c639c54ee56a@arm.com> From: =?UTF-8?Q?Andr=c3=a9_Przywara?= Autocrypt: addr=andre.przywara@arm.com; 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Message-ID: Date: Tue, 8 Dec 2020 00:47:19 +0000 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:68.0) Gecko/20100101 Thunderbird/68.12.0 MIME-Version: 1.0 In-Reply-To: Content-Language: en-GB X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20201207_194731_456129_2414A58A X-CRM114-Status: GOOD ( 35.34 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: devicetree , Jernej Skrabec , Samuel Holland , Linus Walleij , linux-kernel , Maxime Ripard , linux-sunxi , Rob Herring , Icenowy Zheng , Yangtao Li , linux-arm-kernel Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: base64 Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org T24gMDMvMTIvMjAyMCAxNjoyMCwgQ2hlbi1ZdSBUc2FpIHdyb3RlOgoKSGksCgo+IE9uIFRodSwg 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