From patchwork Fri Apr 17 22:17:29 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Priit Laes X-Patchwork-Id: 11496201 Return-Path: Received: from mail.kernel.org (pdx-korg-mail-1.web.codeaurora.org [172.30.200.123]) by pdx-korg-patchwork-2.web.codeaurora.org (Postfix) with ESMTP id 30022913 for ; Fri, 17 Apr 2020 22:29:20 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 13811214D8 for ; Fri, 17 Apr 2020 22:29:20 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=fail reason="signature verification failed" (2048-bit key) header.d=plaes.org header.i=@plaes.org header.b="af1IWOXx" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1728912AbgDQW3R (ORCPT ); Fri, 17 Apr 2020 18:29:17 -0400 Received: from plaes.org ([188.166.43.21]:57504 "EHLO plaes.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1728470AbgDQW3Q (ORCPT ); Fri, 17 Apr 2020 18:29:16 -0400 Received: from localhost (unknown [IPv6:2001:1530:1000:9d4d:940e:6b9e:3deb:4]) by plaes.org (Postfix) with ESMTPSA id 32A4E4125A; Fri, 17 Apr 2020 22:17:56 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=simple/simple; d=plaes.org; s=mail; t=1587161876; bh=B67BSstoliZJd4PmHe0yq3zW5vKkysNKwBTuxR2rqNg=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=af1IWOXxI0lpIUosVpoZq3rzh1E6KKhS3HqyIJn3X4fZEPZZf+o31wYanifmvwmh5 lR0odqnMfuGhG2du6WnkuHvDFUpVYOM1/rbbxBW3xIWd/WVnD13UYZqsVooTvk74Cn uZMCMkYcMX5Ev7EBHfhPcTOshYqYyGDKsv10DnbkwCM2/OI9MLmd+mIf8El7Woa4Uq uWW7wdgKmqQOuzkpcwgy253QmtEvaDOBp7vQ81vpabr71oyv0FFiOwOKWt3Di1hYK1 AUKkLFgNKA3BSVW7alM88sTwKiT5Msm1gV5/zH+tsG0L/kc5rpHlniC9d4xHEPW1Tt qVtgBb4SNBgug== From: Priit Laes To: Maxime Ripard , Chen-Yu Tsai , Rob Herring , linux-kernel@vger.kernel.org, linux-clk@vger.kernel.org, linux-arm-kernel@lists.infradead.org, devicetree@vger.kernel.org, linux-sunxi@googlegroups.com Cc: Priit Laes Subject: [PATCH 3/4] net: stmmac: dwmac-sunxi: Implement syscon-based clock handling Date: Sat, 18 Apr 2020 01:17:29 +0300 Message-Id: <20200417221730.555954-4-plaes@plaes.org> X-Mailer: git-send-email 2.25.2 In-Reply-To: <20200417221730.555954-1-plaes@plaes.org> References: <20200417221730.555954-1-plaes@plaes.org> MIME-Version: 1.0 Sender: linux-clk-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-clk@vger.kernel.org Convert the sun7i-gmac driver to use a regmap-based driver, instead of relying on the custom clock implementation. This allows to get rid of the last custom clock in the sun7i device tree making the sun7i fully CCU-compatible. Compatibility with existing devicetrees is retained. Signed-off-by: Priit Laes --- .../net/ethernet/stmicro/stmmac/dwmac-sunxi.c | 124 ++++++++++++++++-- 1 file changed, 116 insertions(+), 8 deletions(-) diff --git a/drivers/net/ethernet/stmicro/stmmac/dwmac-sunxi.c b/drivers/net/ethernet/stmicro/stmmac/dwmac-sunxi.c index 0e1ca2cba3c7..3476920bc762 100644 --- a/drivers/net/ethernet/stmicro/stmmac/dwmac-sunxi.c +++ b/drivers/net/ethernet/stmicro/stmmac/dwmac-sunxi.c @@ -12,8 +12,11 @@ #include #include #include +#include #include #include +#include +#include #include "stmmac_platform.h" @@ -22,10 +25,20 @@ struct sunxi_priv_data { int clk_enabled; struct clk *tx_clk; struct regulator *regulator; + struct regmap_field *regmap_field; +}; + +/* EMAC clock register @ 0x164 in the CCU address range */ +static const struct reg_field ccu_reg_field = { + .reg = 0x164, + .lsb = 0, + .msb = 31, }; #define SUN7I_GMAC_GMII_RGMII_RATE 125000000 #define SUN7I_GMAC_MII_RATE 25000000 +#define SUN7I_A20_RGMII_CLK ((3 << 1) | (1 << 12)) +#define SUN7I_A20_MII_CLK (1 << 12) static int sun7i_gmac_init(struct platform_device *pdev, void *priv) { @@ -38,7 +51,20 @@ static int sun7i_gmac_init(struct platform_device *pdev, void *priv) return ret; } - /* Set GMAC interface port mode + if (gmac->regmap_field) { + if (phy_interface_mode_is_rgmii(gmac->interface)) { + regmap_field_write(gmac->regmap_field, + SUN7I_A20_RGMII_CLK); + return clk_prepare_enable(gmac->tx_clk); + } + regmap_field_write(gmac->regmap_field, SUN7I_A20_MII_CLK); + return clk_enable(gmac->tx_clk); + } + + /* Legacy devicetree support */ + + /* + * Set GMAC interface port mode * * The GMAC TX clock lines are configured by setting the clock * rate, which then uses the auto-reparenting feature of the @@ -62,9 +88,15 @@ static void sun7i_gmac_exit(struct platform_device *pdev, void *priv) { struct sunxi_priv_data *gmac = priv; - if (gmac->clk_enabled) { + if (gmac->regmap_field) { + regmap_field_write(gmac->regmap_field, 0); clk_disable(gmac->tx_clk); - gmac->clk_enabled = 0; + } else { + /* Legacy devicetree support */ + if (gmac->clk_enabled) { + clk_disable(gmac->tx_clk); + gmac->clk_enabled = 0; + } } clk_unprepare(gmac->tx_clk); @@ -72,10 +104,53 @@ static void sun7i_gmac_exit(struct platform_device *pdev, void *priv) regulator_disable(gmac->regulator); } +static struct regmap *sun7i_gmac_get_syscon_from_dev(struct device_node *node) +{ + struct device_node *syscon_node; + struct platform_device *syscon_pdev; + struct regmap *regmap = NULL; + + syscon_node = of_parse_phandle(node, "syscon", 0); + if (!syscon_node) + return ERR_PTR(-ENODEV); + + syscon_pdev = of_find_device_by_node(syscon_node); + if (!syscon_pdev) { + /* platform device might not be probed yet */ + regmap = ERR_PTR(-EPROBE_DEFER); + goto out_put_node; + } + + /* If no regmap is found then the other device driver is at fault */ + regmap = dev_get_regmap(&syscon_pdev->dev, NULL); + if (!regmap) + regmap = ERR_PTR(-EINVAL); + + platform_device_put(syscon_pdev); +out_put_node: + of_node_put(syscon_node); + return regmap; +} + static void sun7i_fix_speed(void *priv, unsigned int speed) { struct sunxi_priv_data *gmac = priv; + if (gmac->regmap_field) { + clk_disable(gmac->tx_clk); + clk_unprepare(gmac->tx_clk); + if (speed == 1000) + regmap_field_write(gmac->regmap_field, + SUN7I_A20_RGMII_CLK); + else + regmap_field_write(gmac->regmap_field, + SUN7I_A20_MII_CLK); + clk_prepare_enable(gmac->tx_clk); + return; + } + + /* Legacy devicetree support... */ + /* only GMII mode requires us to reconfigure the clock lines */ if (gmac->interface != PHY_INTERFACE_MODE_GMII) return; @@ -102,6 +177,8 @@ static int sun7i_gmac_probe(struct platform_device *pdev) struct stmmac_resources stmmac_res; struct sunxi_priv_data *gmac; struct device *dev = &pdev->dev; + struct device_node *syscon_node; + struct regmap *regmap = NULL; int ret; ret = stmmac_get_platform_resources(pdev, &stmmac_res); @@ -124,11 +201,42 @@ static int sun7i_gmac_probe(struct platform_device *pdev) goto err_remove_config_dt; } - gmac->tx_clk = devm_clk_get(dev, "allwinner_gmac_tx"); - if (IS_ERR(gmac->tx_clk)) { - dev_err(dev, "could not get tx clock\n"); - ret = PTR_ERR(gmac->tx_clk); - goto err_remove_config_dt; + /* Attempt to fetch syscon node... */ + syscon_node = of_parse_phandle(dev->of_node, "syscon", 0); + if (syscon_node) { + gmac->tx_clk = devm_clk_get(dev, "stmmaceth"); + if (IS_ERR(gmac->tx_clk)) { + dev_err(dev, "Could not get TX clock\n"); + ret = PTR_ERR(gmac->tx_clk); + goto err_remove_config_dt; + } + + regmap = sun7i_gmac_get_syscon_from_dev(pdev->dev.of_node); + if (IS_ERR(regmap)) + regmap = syscon_regmap_lookup_by_phandle(pdev->dev.of_node, + "syscon"); + if (IS_ERR(regmap)) { + ret = PTR_ERR(regmap); + dev_err(&pdev->dev, "Unable to map syscon: %d\n", ret); + goto err_remove_config_dt; + } + + gmac->regmap_field = devm_regmap_field_alloc(dev, regmap, ccu_reg_field); + + if (IS_ERR(gmac->regmap_field)) { + ret = PTR_ERR(gmac->regmap_field); + dev_err(dev, "Unable to map syscon register: %d\n", ret); + goto err_remove_config_dt; + } + /* ...or fall back to legacy clock setup */ + } else { + dev_info(dev, "Falling back to legacy devicetree support!\n"); + gmac->tx_clk = devm_clk_get(dev, "allwinner_gmac_tx"); + if (IS_ERR(gmac->tx_clk)) { + dev_err(dev, "could not get tx clock\n"); + ret = PTR_ERR(gmac->tx_clk); + goto err_remove_config_dt; + } } /* Optional regulator for PHY */