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 vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id E661BC61DA4 for ; Fri, 3 Feb 2023 07:03:28 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S232103AbjBCHD1 (ORCPT ); Fri, 3 Feb 2023 02:03:27 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:54342 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S231716AbjBCHDW (ORCPT ); Fri, 3 Feb 2023 02:03:22 -0500 Received: from fudo.makrotopia.org (fudo.makrotopia.org [IPv6:2a07:2ec0:3002::71]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 6296A8F25C; Thu, 2 Feb 2023 23:02:44 -0800 (PST) Received: from local by fudo.makrotopia.org with esmtpsa (TLS1.3:TLS_AES_256_GCM_SHA384:256) (Exim 4.96) (envelope-from ) id 1pNq5p-0000oD-2W; Fri, 03 Feb 2023 08:02:41 +0100 Date: Fri, 3 Feb 2023 07:01:01 +0000 From: Daniel Golle To: netdev@vger.kernel.org, linux-mediatek@lists.infradead.org, linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org, Russell King , Heiner Kallweit , Lorenzo Bianconi , Mark Lee , John Crispin , Felix Fietkau , AngeloGioacchino Del Regno , Matthias Brugger , DENG Qingfang , Landen Chao , Sean Wang , Paolo Abeni , Jakub Kicinski , Eric Dumazet , "David S. Miller" , Vladimir Oltean , Florian Fainelli , Andrew Lunn Cc: Jianhui Zhao , =?iso-8859-1?Q?Bj=F8rn?= Mork Subject: [PATCH 2/9] net: ethernet: mtk_eth_soc: set MDIO bus clock frequency Message-ID: References: MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Set MDIO bus clock frequency and allow setting a custom maximum frequency from device tree. Signed-off-by: Daniel Golle --- drivers/net/ethernet/mediatek/mtk_eth_soc.c | 25 +++++++++++++++++++++ drivers/net/ethernet/mediatek/mtk_eth_soc.h | 5 +++++ 2 files changed, 30 insertions(+) diff --git a/drivers/net/ethernet/mediatek/mtk_eth_soc.c b/drivers/net/ethernet/mediatek/mtk_eth_soc.c index a44ffff48c7b..9050423821dc 100644 --- a/drivers/net/ethernet/mediatek/mtk_eth_soc.c +++ b/drivers/net/ethernet/mediatek/mtk_eth_soc.c @@ -790,7 +790,9 @@ static const struct phylink_mac_ops mtk_phylink_ops = { static int mtk_mdio_init(struct mtk_eth *eth) { struct device_node *mii_np; + int clk = 25000000, max_clk = 2500000, divider = 1; int ret; + u32 val; mii_np = of_get_child_by_name(eth->dev->of_node, "mdio-bus"); if (!mii_np) { @@ -818,6 +820,29 @@ static int mtk_mdio_init(struct mtk_eth *eth) eth->mii_bus->parent = eth->dev; snprintf(eth->mii_bus->id, MII_BUS_ID_SIZE, "%pOFn", mii_np); + + if (!of_property_read_u32(mii_np, "clock-frequency", &val)) + max_clk = val; + + while (clk / divider > max_clk) { + if (divider >= 63) + break; + + divider++; + }; + + val = mtk_r32(eth, MTK_PPSC); + val |= PPSC_MDC_TURBO; + mtk_w32(eth, val, MTK_PPSC); + + /* Configure MDC Divider */ + val = mtk_r32(eth, MTK_PPSC); + val &= ~PPSC_MDC_CFG; + val |= FIELD_PREP(PPSC_MDC_CFG, divider); + mtk_w32(eth, val, MTK_PPSC); + + dev_dbg(eth->dev, "MDC is running on %d Hz\n", clk / divider); + ret = of_mdiobus_register(eth->mii_bus, mii_np); err_put_node: diff --git a/drivers/net/ethernet/mediatek/mtk_eth_soc.h b/drivers/net/ethernet/mediatek/mtk_eth_soc.h index 7230dcb29315..724815ae18a0 100644 --- a/drivers/net/ethernet/mediatek/mtk_eth_soc.h +++ b/drivers/net/ethernet/mediatek/mtk_eth_soc.h @@ -363,6 +363,11 @@ #define RX_DMA_VTAG_V2 BIT(0) #define RX_DMA_L4_VALID_V2 BIT(2) +/* PHY Polling and SMI Master Control registers */ +#define MTK_PPSC 0x10000 +#define PPSC_MDC_CFG GENMASK(29, 24) +#define PPSC_MDC_TURBO BIT(20) + /* PHY Indirect Access Control registers */ #define MTK_PHY_IAC 0x10004 #define PHY_IAC_ACCESS BIT(31) -- 2.39.1