From patchwork Wed Oct 2 10:48:04 2024 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Conor Dooley X-Patchwork-Id: 13819645 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 41F21CF31B0 for ; Wed, 2 Oct 2024 10:58:50 +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=H2BGWboUXB8938jeEKIpyv/LPQlX7gwQ6lXvTXK6cdo=; b=X5IEXretVW5eRa uOlGVJ6YSmNSn6Qdi72L04ONMqdj+lYL8s41/x1uC0Yi9SlpIlxSs9KxUMga0TFP37srKP2IBm4Yd zTI1mydS4mHaM0Gk170JSMIYXLgIfVcCzqTrc7duNz7uDSZgt0kKAzRRloTYLLoTB0S7pboEXzXMP pAHXg3pam7ZUa1rbcuBiu0eReFQEP+WnlBcAssL4ile/EvqDGwvd3+ibTart+BOz0343OAGoHSQda K6X1FH39LrBaCfyFm5X7mMCKentj3Jy948pVvAcVvD0COoVnZ1vdSQAGaS5AR5pUAVbQVUHZAXvMm 8rZD7kzmJZtyJ7QGfG6Q==; Received: from localhost ([::1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.98 #2 (Red Hat Linux)) id 1svx4B-00000005aBu-0aBG; Wed, 02 Oct 2024 10:58:47 +0000 Received: from dfw.source.kernel.org ([2604:1380:4641:c500::1]) by bombadil.infradead.org with esmtps (Exim 4.98 #2 (Red Hat Linux)) id 1svwuP-00000005Xtq-1RtX; Wed, 02 Oct 2024 10:48:43 +0000 Received: from smtp.kernel.org (transwarp.subspace.kernel.org [100.75.92.58]) by dfw.source.kernel.org (Postfix) with ESMTP id B5B2B5C38F4; Wed, 2 Oct 2024 10:48:36 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id 1B0F1C4CECF; Wed, 2 Oct 2024 10:48:35 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1727866120; bh=aO/B5sOpOxYNDl2NnVgAoNdJHBau2D0IQZssejD8wN4=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=KuxCWszQEiOTLxYShOLqf1wvo1xjoc0uyEKUXsZGcXfBoUydX7yRQ5gVt+SHtInch lD/QqnAXK7g2wWxR5ma+NKH2tqS44Jp0moFVzFkzMvt1SfeWXHdCWv2QtkD72FgJAX YJELvmMxa7y/02Fqb3NAkyVoxDZ/QgdvVmJgV3EneD+QJRgwfq51z+XcqlxnVZ+WIl B8NNd0tRFKF+1jARSRlUKd5/SiMIzXd8Rhe9r9JbTEgPLBy6VNizK2SGewSgeiq9wv juBNdYJFFTQap1Nd5xkSwuSkl3tWXiaWERUOQdwjYXbI/JeDHvqGOrZF5F1vAqT2px pgu3gjpB0BM5g== From: Conor Dooley To: linux-kernel@vger.kernel.org Cc: conor@kernel.org, Conor Dooley , Daire McNamara , pierre-henry.moussay@microchip.com, valentina.fernandezalanis@microchip.com, Michael Turquette , Stephen Boyd , Rob Herring , Krzysztof Kozlowski , Jassi Brar , Lee Jones , Paul Walmsley , Palmer Dabbelt , Albert Ou , Neil Armstrong , Jerome Brunet , Kevin Hilman , Martin Blumenstingl , Philipp Zabel , linux-riscv@lists.infradead.org, linux-clk@vger.kernel.org, devicetree@vger.kernel.org, linux-amlogic@lists.infradead.org, linux-arm-kernel@lists.infradead.org Subject: [PATCH v1 06/11] reset: mpfs: add non-auxiliary bus probing Date: Wed, 2 Oct 2024 11:48:04 +0100 Message-ID: <20241002-breeze-anywhere-4114da636ec6@spud> X-Mailer: git-send-email 2.45.2 In-Reply-To: <20241002-private-unequal-33cfa6101338@spud> References: <20241002-private-unequal-33cfa6101338@spud> MIME-Version: 1.0 X-Developer-Signature: v=1; a=openpgp-sha256; l=5754; i=conor.dooley@microchip.com; h=from:subject:message-id; bh=i35+CsFCV6sYfJT3KjLRVBUt7UkYZ1HKKhA4wN86iUQ=; b=owGbwMvMwCFWscWwfUFT0iXG02pJDGl/VR6eDFO8tGTeB5GOJKuovLnZ50Jmp+88oLrKMq3ts 09enm54RykLgxgHg6yYIkvi7b4WqfV/XHY497yFmcPKBDKEgYtTACbC78nwP+KTgmbztesTTtTa WS9XXcj5U0ohW7nR0OX5k+Yj/OsKrzMy7LX5YqEg/G1yF6vTlJrZRqcfnakPjpc4s+KFYsJMa7V CTgA= X-Developer-Key: i=conor.dooley@microchip.com; a=openpgp; fpr=F9ECA03CF54F12CD01F1655722E2C55B37CF380C X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20241002_034841_518134_9DFD4D17 X-CRM114-Status: GOOD ( 19.95 ) X-BeenThere: linux-riscv@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-riscv" Errors-To: linux-riscv-bounces+linux-riscv=archiver.kernel.org@lists.infradead.org From: Conor Dooley While the auxiliary bus was a nice bandaid, and meant that re-writing the representation of the clock regions in devicetree was not required, it has run its course. The "mss_top_sysreg" region that contains the clock and reset regions, also contains pinctrl and an interrupt controller, so the time has come rewrite the devicetree and probe the reset controller from an mfd devicetree node, rather than implement those drivers using the auxiliary bus. Wanting to avoid propagating this naive/incorrect description of the hardware to the new pic64gx SoC is a major motivating factor here. Signed-off-by: Conor Dooley --- drivers/reset/reset-mpfs.c | 83 ++++++++++++++++++++++++++++++++------ 1 file changed, 71 insertions(+), 12 deletions(-) diff --git a/drivers/reset/reset-mpfs.c b/drivers/reset/reset-mpfs.c index 710f9c1676f93..ac72e0fc405ed 100644 --- a/drivers/reset/reset-mpfs.c +++ b/drivers/reset/reset-mpfs.c @@ -9,10 +9,12 @@ #include #include #include +#include #include #include #include #include +#include #include #include #include @@ -27,14 +29,37 @@ #define MPFS_SLEEP_MIN_US 100 #define MPFS_SLEEP_MAX_US 200 +#define REG_SUBBLK_RESET_CR 0x88u + /* block concurrent access to the soft reset register */ static DEFINE_SPINLOCK(mpfs_reset_lock); struct mpfs_reset { void __iomem *base; + struct regmap *regmap; struct reset_controller_dev rcdev; }; +static inline u32 mpfs_reset_read(struct mpfs_reset *rst) +{ + u32 ret; + + if (rst->regmap) + regmap_read(rst->regmap, REG_SUBBLK_RESET_CR, &ret); + else + ret = readl(rst->base); + + return ret; +} + +static inline void mpfs_reset_write(struct mpfs_reset *rst, u32 val) +{ + if (rst->regmap) + regmap_write(rst->regmap, REG_SUBBLK_RESET_CR, val); + else + writel(val, rst->base); +} + static inline struct mpfs_reset *to_mpfs_reset(struct reset_controller_dev *rcdev) { return container_of(rcdev, struct mpfs_reset, rcdev); @@ -51,9 +76,9 @@ static int mpfs_assert(struct reset_controller_dev *rcdev, unsigned long id) spin_lock_irqsave(&mpfs_reset_lock, flags); - reg = readl(rst->base); + reg = mpfs_reset_read(rst); reg |= BIT(id); - writel(reg, rst->base); + mpfs_reset_write(rst, reg); spin_unlock_irqrestore(&mpfs_reset_lock, flags); @@ -68,9 +93,9 @@ static int mpfs_deassert(struct reset_controller_dev *rcdev, unsigned long id) spin_lock_irqsave(&mpfs_reset_lock, flags); - reg = readl(rst->base); + reg = mpfs_reset_read(rst); reg &= ~BIT(id); - writel(reg, rst->base); + mpfs_reset_write(rst, reg); spin_unlock_irqrestore(&mpfs_reset_lock, flags); @@ -80,7 +105,7 @@ static int mpfs_deassert(struct reset_controller_dev *rcdev, unsigned long id) static int mpfs_status(struct reset_controller_dev *rcdev, unsigned long id) { struct mpfs_reset *rst = to_mpfs_reset(rcdev); - u32 reg = readl(rst->base); + u32 reg = mpfs_reset_read(rst); /* * It is safe to return here as MPFS_NUM_RESETS makes sure the sign bit @@ -130,11 +155,45 @@ static int mpfs_reset_xlate(struct reset_controller_dev *rcdev, return index - MPFS_PERIPH_OFFSET; } -static int mpfs_reset_probe(struct auxiliary_device *adev, - const struct auxiliary_device_id *id) +static int mpfs_reset_mfd_probe(struct platform_device *pdev) { - struct device *dev = &adev->dev; struct reset_controller_dev *rcdev; + struct device *dev = &pdev->dev; + struct mpfs_reset *rst; + + rst = devm_kzalloc(dev, sizeof(*rst), GFP_KERNEL); + if (!rst) + return -ENOMEM; + + rcdev = &rst->rcdev; + rcdev->dev = dev; + rcdev->ops = &mpfs_reset_ops; + + rcdev->of_node = pdev->dev.parent->of_node; + rcdev->of_reset_n_cells = 1; + rcdev->of_xlate = mpfs_reset_xlate; + rcdev->nr_resets = MPFS_NUM_RESETS; + + rst->regmap = device_node_to_regmap(pdev->dev.parent->of_node); + if (IS_ERR(rst->regmap)) + dev_err_probe(dev, PTR_ERR(rst->regmap), "Failed to find syscon regmap\n"); + + return devm_reset_controller_register(dev, rcdev); +} + +static struct platform_driver mpfs_reset_mfd_driver = { + .probe = mpfs_reset_mfd_probe, + .driver = { + .name = "mpfs-reset", + }, +}; +module_platform_driver(mpfs_reset_mfd_driver); + +static int mpfs_reset_adev_probe(struct auxiliary_device *adev, + const struct auxiliary_device_id *id) +{ + struct reset_controller_dev *rcdev; + struct device *dev = &adev->dev; struct mpfs_reset *rst; rst = devm_kzalloc(dev, sizeof(*rst), GFP_KERNEL); @@ -145,8 +204,8 @@ static int mpfs_reset_probe(struct auxiliary_device *adev, rcdev = &rst->rcdev; rcdev->dev = dev; - rcdev->dev->parent = dev->parent; rcdev->ops = &mpfs_reset_ops; + rcdev->of_node = dev->parent->of_node; rcdev->of_reset_n_cells = 1; rcdev->of_xlate = mpfs_reset_xlate; @@ -222,12 +281,12 @@ static const struct auxiliary_device_id mpfs_reset_ids[] = { }; MODULE_DEVICE_TABLE(auxiliary, mpfs_reset_ids); -static struct auxiliary_driver mpfs_reset_driver = { - .probe = mpfs_reset_probe, +static struct auxiliary_driver mpfs_reset_aux_driver = { + .probe = mpfs_reset_adev_probe, .id_table = mpfs_reset_ids, }; -module_auxiliary_driver(mpfs_reset_driver); +module_auxiliary_driver(mpfs_reset_aux_driver); MODULE_DESCRIPTION("Microchip PolarFire SoC Reset Driver"); MODULE_AUTHOR("Conor Dooley ");