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Received: from localhost ([127.0.0.1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.92.3 #3 (Red Hat Linux)) id 1jVVDN-0007lF-A4; Mon, 04 May 2020 07:08:33 +0000 Received: from bhuna.collabora.co.uk ([2a00:1098:0:82:1000:25:2eeb:e3e3]) by bombadil.infradead.org with esmtps (Exim 4.92.3 #3 (Red Hat Linux)) id 1jVVDK-0007kL-0s for linux-mtd@lists.infradead.org; Mon, 04 May 2020 07:08:32 +0000 Received: from localhost (unknown [IPv6:2a01:e0a:2c:6930:5cf4:84a1:2763:fe0d]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) (Authenticated sender: bbrezillon) by bhuna.collabora.co.uk (Postfix) with ESMTPSA id BB7F32A0DA5; Mon, 4 May 2020 08:08:27 +0100 (BST) Date: Mon, 4 May 2020 09:08:24 +0200 From: Boris Brezillon To: "Ramuthevar, Vadivel MuruganX" , linux-kernel@vger.kernel.org, tglx@linutronix.de Subject: Re: [PATCH v4 2/2] mtd: rawnand: Add NAND controller support on Intel LGM SoC Message-ID: <20200504090824.1eb16b78@collabora.com> In-Reply-To: References: <20200429104205.18780-1-vadivel.muruganx.ramuthevar@linux.intel.com> <20200429104205.18780-3-vadivel.muruganx.ramuthevar@linux.intel.com> <20200429162249.55d38ee8@collabora.com> <9d77c64c-d0f9-7a13-3391-d05bf458bdb1@linux.intel.com> <20200429164832.6800fc70@collabora.com> <2e83a2f7-853c-f0e2-f686-daf1e0649eae@linux.intel.com> <20200429173107.5c6d2f55@collabora.com> <1de9ba29-30f1-6829-27e0-6f141e9bb1e6@linux.intel.com> <20200430102114.29b6552f@collabora.com> <1df71cf7-4cae-4cd0-864c-0812bb2cc123@linux.intel.com> <20200430103658.4b0b979e@collabora.com> <1d5aec11-a7b5-01c2-6614-16e57c64511b@linux.intel.com> <20200430143600.27031639@collabora.com> <20200430150124.7856d112@collabora.com> Organization: Collabora X-Mailer: Claws Mail 3.17.5 (GTK+ 2.24.32; x86_64-redhat-linux-gnu) MIME-Version: 1.0 X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20200504_000830_327717_7BDE7A63 X-CRM114-Status: GOOD ( 23.34 ) X-BeenThere: linux-mtd@lists.infradead.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Linux MTD discussion mailing list List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: cheol.yong.kim@intel.com, devicetree@vger.kernel.org, qi-ming.wu@intel.com, anders.roxell@linaro.org, vigneshr@ti.com, arnd@arndb.de, hauke.mehrtens@intel.com, richard@nod.at, brendanhiggins@google.com, linux-mips@vger.kernel.org, robh+dt@kernel.org, linux-mtd@lists.infradead.org, miquel.raynal@bootlin.com, masonccyang@mxic.com.tw, andriy.shevchenko@intel.com Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Sender: "linux-mtd" Errors-To: linux-mtd-bounces+linux-mtd=archiver.kernel.org@lists.infradead.org On Mon, 4 May 2020 10:02:35 +0800 "Ramuthevar, Vadivel MuruganX" wrote: > Hi Boris, > > On 30/4/2020 9:01 pm, Boris Brezillon wrote: > > On Thu, 30 Apr 2020 14:36:00 +0200 > > Boris Brezillon wrote: > > > >> On Thu, 30 Apr 2020 17:07:03 +0800 > >> "Ramuthevar, Vadivel MuruganX" > >> wrote: > >> > >>>>>> The question is, is it the same value we have in nand_pa or it is > >>>>>> different? > >>>>>> > >>>>> Different address which is 0xE1400000 NAND_BASE_PHY address. > >>>> > >>>> Then why didn't you tell me they didn't match when I suggested to pass > >>> > >>> sorry, because you keep asking nand_pa after that only I realized that. > >>> > >>>> nand_pa? So now the question is, what does this address represent? > >>> > >>> EBU-MODULE > >>> _________ _______________________ > >>> | | | |NAND CTRL | > >>> | FPI BUS |==>| CS0(0x174) | 0xE100 ( 0xE14/0xE1C) NAND_PHY_BASE > >>> |_________| |_CS1(0x17C)_|__________ | > >>> > >>> EBU_CONRTROLLER_BASE : 0xE0F0_0000 > >>> HSNAND_BASE: 0xE100_0000 > >>> NAND_CS0: 0xE140_0000 > >>> NAND_CS1: 0xE1C0_0000 > >>> > >>> MEM_REGION_BASE_CS0: 0x17400 (internal to ebu controller ) > >>> MEM_REGION_BASE_CS1: 0x17C00 > >>> > >> > >> Hm, I wonder if we shouldn't use a 'ranges' property to describe this > >> address translation. Something like > >> > >> ebu@xxx { > >> ranges = <0x17400000 0xe1400000 0x1000>, > >> <0x17c00000 0xe1c00000 0x1000>; > >> reg = <0x17400000>, <0x17c00000>; > >> reg-names = "cs-0", "cs-1"; > >> } > >> > >> The translated address (0xE1X00000) will be available in res->start, > >> and the non-translated one (0x17X00000) can be retrieved with > >> of_get_address(). All you'd have to do then would be calculate the > >> mask: > >> > >> mask = (translated_address & original_address) >> 22; > >> num_comp_bits = fls(mask); > >> WARN_ON(mask != GENMASK(num_comp_bits - 1, 0)); > >> > >> Which allows you to properly set the ADDR_SEL() register without > >> relying on some hardcoded values: > >> > >> writel(original_address | EBU_ADDR_SEL_REGEN | > >> EBU_ADDR_COMP_BITS(num_comp_bits), > >> ebu_host->ebu + EBU_ADDR_SEL(csid)); > >> > >> That's quite important if we want to merge the xway NAND driver with > >> this one. > > > > Looks like the translation is done at the FPI bus declaration level (see > > [1]). We really need to see the big picture to take a wise decision > > about the bindings. Would you mind pasting your dsti/dts files > > somewhere? It feels like the NAND controller is a sub-part of a more > > generic 'memory' controller, in which case the NAND controller should be > > declared as a child of this generic memory bus (called localbus in [1], > > but maybe EBU is more accurate). > > > > [1]https://github.com/xieyaxiongfly/Atheros_CSI_tool_OpenWRT_src/blob/master/target/linux/lantiq/files-4.14/arch/mips/boot/dts/vr9.dtsi#L162 > > > ebu_nand: ebu_nand@e0f00000 { > compatible = "intel,lgm-ebu-nand"; > reg = <0xe0f00000 0x100 > 0xe1000000 0x300 > 0xe1400000 0x80000 > 0xe1c00000 0x10000>; > reg-names = "ebunand", "hsnand", "nand_cs0", nand_cs1"; > dmas = <&dma0 8>, <&dma0 9>; > dma-names = "ebu_rx", "ebu_tx"; > clocks = <&cgu0 LGM_GCLK_EBU>; > }; > > > &ebu_nand { > status = "disabled"; > nand,cs = <1>; > nand-ecc-mode = "hw"; > pinctrl-names = "default"; > pinctrl-0 = <&ebu_nand_base &ebu_cs1>; > }; > > > Ok. If I understand the SoC topology correctly it should actually be something like that: { ... fpi@xxxxx { compatible = "intel,lgm-fpi", "simple-bus"; /* You might have other ranges to define here */ ranges = <0x16000000 0xe0000000 0x1000000>; ... ebu@xxxx { compatible = "intel,lgm-ebu", "simple-bus"; ranges; pinctrl-names = "default"; pinctrl-0 = <&ebu_nand_base &ebu_cs1>; /* * Add your PCI and NOR controller definitions * here. */ ... nand-controller@16f00000 { compatible = "intel,lgm-ebu-nand-controller"; reg = <0x16f00000 0x100>, <0x17000000 0x300>, <0x17400000 0x80000>, <0x17c00000 0x10000>; reg-names = "ebunand", "hsnand", "cs0", cs1"; #address-cells = <1>; #size-cells = <0>; /* * I'm not sure if those belong here: if the * DMA channels and clocks are shared by all * controllers attached to the EBU they should * be moved to the EBU node. */ dmas = <&dma0 8>, <&dma0 9>; dma-names = "rx", "tx"; clocks = <&cgu0 LGM_GCLK_EBU>; nand@1 { reg = <1>; nand-ecc-mode = "hw"; } } } } } ______________________________________________________ Linux MTD discussion mailing list http://lists.infradead.org/mailman/listinfo/linux-mtd/