From patchwork Mon Aug 22 09:18:34 2022 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Liang Yang X-Patchwork-Id: 12950408 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from bombadil.infradead.org (bombadil.infradead.org [198.137.202.133]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.lore.kernel.org (Postfix) with ESMTPS id 6E83BC28D13 for ; Mon, 22 Aug 2022 09:21:50 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=lists.infradead.org; s=bombadil.20210309; h=Sender: Content-Transfer-Encoding:Content-Type:List-Subscribe:List-Help:List-Post: List-Archive:List-Unsubscribe:List-Id:MIME-Version:References:In-Reply-To: Message-ID:Date:Subject:CC:To:From:Reply-To:Content-ID:Content-Description: Resent-Date:Resent-From:Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID: List-Owner; bh=hqaJ3wm+YSB1XsDgWLOuJ02LDR5Lu3j44oULucwYbx4=; b=e9Y8Hc0NCKBB9F Va3Le1LqYRSMumV+9627oGO+xdJjYYTEYDEliP2Y0PSm2kxc+55Ad630Fz2e+PYNbwfB+/QMxHK5L YLfsUP8Y1v/MRN0DK856JJTkLoACl1ZVl5oQ3SNsl8DDbuSPTSpewaKE1ir1y8wr+sC0WRxfDrC1v IF3ZUbDO/Ef1L/BQKjJk1DI0P/mOL2CCHwujV7ZzCFAuASMspcdzgZ3Zfx5GhsbzKv8pd8+LZL4sF u3GC+SyFiMeVdm1K1PoNya2/+IlO85O5WdobOmqDOcXPXqwNZxe8Q3wDM67j6UF7623daZwKUyCxU SNLm63bO12dY0UdcY5xQ==; Received: from localhost ([::1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.94.2 #2 (Red Hat Linux)) id 1oQ3bu-006wUk-HB; Mon, 22 Aug 2022 09:20:42 +0000 Received: from mail-sz.amlogic.com ([211.162.65.117]) by bombadil.infradead.org with esmtps (Exim 4.94.2 #2 (Red Hat Linux)) id 1oQ3bN-006w4Q-1w; Mon, 22 Aug 2022 09:20:10 +0000 Received: from droid11-sz.amlogic.com (10.28.8.21) by mail-sz.amlogic.com (10.28.11.5) with Microsoft SMTP Server id 15.1.2507.6; Mon, 22 Aug 2022 17:19:47 +0800 From: Liang Yang To: Miquel Raynal , CC: Liang Yang , Kevin Hilman , Rob Herring , Richard Weinberger , Vignesh Raghavendra , Jerome Brunet , Neil Armstrong , Martin Blumenstingl , Jianxin Pan , Victor Wan , XianWei Zhao , Kelvin Zhang , BiChao Zheng , YongHui Yu , , , Subject: [PATCH RESEND v8 2/5] mtd: rawnand: meson: fix the clock Date: Mon, 22 Aug 2022 17:18:34 +0800 Message-ID: <20220822091838.18528-3-liang.yang@amlogic.com> X-Mailer: git-send-email 2.34.1 In-Reply-To: <20220822091838.18528-1-liang.yang@amlogic.com> References: <20220822091838.18528-1-liang.yang@amlogic.com> MIME-Version: 1.0 X-Originating-IP: [10.28.8.21] X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20220822_022009_147850_F6761CA0 X-CRM114-Status: GOOD ( 18.35 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org EMMC and NAND have the same clock control register named 'SD_EMMC_CLOCK' which is defined in EMMC port internally. bit0~5 of 'SD_EMMC_CLOCK' is the divider and bit6~7 is the mux for fix pll and xtal. At the beginning, a common MMC and NAND sub-clock was discussed and planed to be implemented as NFC clock provider, but now this series of patches of a common MMC and NAND sub-clock are never being accepted. the reasons for giving up are: 1. EMMC and NAND, which are mutually exclusive anyway 2. coupling the EMMC and NAND. 3. it seems that a common MMC and NAND sub-clock is over engineered. and let us see the link fot more information: https://lore.kernel.org/all/20220121074508.42168-5-liang.yang@amlogic.com so The meson nfc can't work now, let us rework the clock. Reviewed-by: Kevin Hilman Signed-off-by: Liang Yang --- drivers/mtd/nand/raw/meson_nand.c | 82 +++++++++++++++---------------- 1 file changed, 41 insertions(+), 41 deletions(-) diff --git a/drivers/mtd/nand/raw/meson_nand.c b/drivers/mtd/nand/raw/meson_nand.c index ac3be92872d0..cc93667a1e7f 100644 --- a/drivers/mtd/nand/raw/meson_nand.c +++ b/drivers/mtd/nand/raw/meson_nand.c @@ -10,6 +10,7 @@ #include #include #include +#include #include #include #include @@ -56,6 +57,9 @@ #define NFC_RB_IRQ_EN BIT(21) +#define CLK_DIV_SHIFT 0 +#define CLK_DIV_WIDTH 6 + #define CMDRWGEN(cmd_dir, ran, bch, short_mode, page_size, pages) \ ( \ (cmd_dir) | \ @@ -151,15 +155,15 @@ struct meson_nfc { struct nand_controller controller; struct clk *core_clk; struct clk *device_clk; - struct clk *phase_tx; - struct clk *phase_rx; + struct clk *nand_clk; + struct clk_divider nand_divider; unsigned long clk_rate; u32 bus_timing; struct device *dev; void __iomem *reg_base; - struct regmap *reg_clk; + void __iomem *reg_clk; struct completion completion; struct list_head chips; const struct meson_nfc_data *data; @@ -235,7 +239,7 @@ static void meson_nfc_select_chip(struct nand_chip *nand, int chip) nfc->timing.tbers_max = meson_chip->tbers_max; if (nfc->clk_rate != meson_chip->clk_rate) { - ret = clk_set_rate(nfc->device_clk, meson_chip->clk_rate); + ret = clk_set_rate(nfc->nand_clk, meson_chip->clk_rate); if (ret) { dev_err(nfc->dev, "failed to set clock rate\n"); return; @@ -987,6 +991,8 @@ static const struct mtd_ooblayout_ops meson_ooblayout_ops = { static int meson_nfc_clk_init(struct meson_nfc *nfc) { + struct clk_parent_data nfc_divider_parent_data[1]; + struct clk_init_data init = {0}; int ret; /* request core clock */ @@ -1002,21 +1008,28 @@ static int meson_nfc_clk_init(struct meson_nfc *nfc) return PTR_ERR(nfc->device_clk); } - nfc->phase_tx = devm_clk_get(nfc->dev, "tx"); - if (IS_ERR(nfc->phase_tx)) { - dev_err(nfc->dev, "failed to get TX clk\n"); - return PTR_ERR(nfc->phase_tx); - } - - nfc->phase_rx = devm_clk_get(nfc->dev, "rx"); - if (IS_ERR(nfc->phase_rx)) { - dev_err(nfc->dev, "failed to get RX clk\n"); - return PTR_ERR(nfc->phase_rx); - } + init.name = devm_kasprintf(nfc->dev, + GFP_KERNEL, "%s#div", + dev_name(nfc->dev)); + init.ops = &clk_divider_ops; + nfc_divider_parent_data[0].fw_name = "device"; + init.parent_data = nfc_divider_parent_data; + init.num_parents = 1; + nfc->nand_divider.reg = nfc->reg_clk; + nfc->nand_divider.shift = CLK_DIV_SHIFT; + nfc->nand_divider.width = CLK_DIV_WIDTH; + nfc->nand_divider.hw.init = &init; + nfc->nand_divider.flags = CLK_DIVIDER_ONE_BASED | + CLK_DIVIDER_ROUND_CLOSEST | + CLK_DIVIDER_ALLOW_ZERO; + + nfc->nand_clk = devm_clk_register(nfc->dev, &nfc->nand_divider.hw); + if (IS_ERR(nfc->nand_clk)) + return PTR_ERR(nfc->nand_clk); /* init SD_EMMC_CLOCK to sane defaults w/min clock rate */ - regmap_update_bits(nfc->reg_clk, - 0, CLK_SELECT_NAND, CLK_SELECT_NAND); + writel(CLK_SELECT_NAND | readl(nfc->reg_clk), + nfc->reg_clk); ret = clk_prepare_enable(nfc->core_clk); if (ret) { @@ -1030,29 +1043,21 @@ static int meson_nfc_clk_init(struct meson_nfc *nfc) goto err_device_clk; } - ret = clk_prepare_enable(nfc->phase_tx); + ret = clk_prepare_enable(nfc->nand_clk); if (ret) { - dev_err(nfc->dev, "failed to enable TX clock\n"); - goto err_phase_tx; + dev_err(nfc->dev, "pre enable NFC divider fail\n"); + goto err_nand_clk; } - ret = clk_prepare_enable(nfc->phase_rx); - if (ret) { - dev_err(nfc->dev, "failed to enable RX clock\n"); - goto err_phase_rx; - } - - ret = clk_set_rate(nfc->device_clk, 24000000); + ret = clk_set_rate(nfc->nand_clk, 24000000); if (ret) - goto err_disable_rx; + goto err_disable_clk; return 0; -err_disable_rx: - clk_disable_unprepare(nfc->phase_rx); -err_phase_rx: - clk_disable_unprepare(nfc->phase_tx); -err_phase_tx: +err_disable_clk: + clk_disable_unprepare(nfc->nand_clk); +err_nand_clk: clk_disable_unprepare(nfc->device_clk); err_device_clk: clk_disable_unprepare(nfc->core_clk); @@ -1061,8 +1066,7 @@ static int meson_nfc_clk_init(struct meson_nfc *nfc) static void meson_nfc_disable_clk(struct meson_nfc *nfc) { - clk_disable_unprepare(nfc->phase_rx); - clk_disable_unprepare(nfc->phase_tx); + clk_disable_unprepare(nfc->nand_clk); clk_disable_unprepare(nfc->device_clk); clk_disable_unprepare(nfc->core_clk); } @@ -1396,13 +1400,9 @@ static int meson_nfc_probe(struct platform_device *pdev) if (IS_ERR(nfc->reg_base)) return PTR_ERR(nfc->reg_base); - nfc->reg_clk = - syscon_regmap_lookup_by_phandle(dev->of_node, - "amlogic,mmc-syscon"); - if (IS_ERR(nfc->reg_clk)) { - dev_err(dev, "Failed to lookup clock base\n"); + nfc->reg_clk = devm_platform_ioremap_resource_byname(pdev, "emmc"); + if (IS_ERR(nfc->reg_clk)) return PTR_ERR(nfc->reg_clk); - } irq = platform_get_irq(pdev, 0); if (irq < 0)