From nobody Thu Sep 19 21:32:15 2024 Received: from esa.microchip.iphmx.com (esa.microchip.iphmx.com [68.232.154.123]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 7471F1B1506; Mon, 9 Sep 2024 08:26:23 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=68.232.154.123 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1725870385; cv=none; b=lUvxahORRhAx0ZpSqll7alFXH2syll+QyudGGktErxI9jEXVI8ADA1axZw5nrQJFdauor7PP7mNesgRtnhL1YJIIq6EjcsZxdQyLfWwv4v/FAMyV8bvQtma45rrNVwPAwr4Ou4cKO5iQmvj0MV/VuDogXKHlbEzPBsn8dY3ry+M= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1725870385; c=relaxed/simple; bh=S7FYudartPoRxv7ei2GeIG0dTCpBW7Lavt39Fq1e7lM=; h=From:To:CC:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version:Content-Type; b=o9hspb172xmIOsrWCSDBiOR02xAc5LtqjIW5xMRzopFj1Gcn+fM8jcNQYGRsTs92RJC66vcBqw437bwoymjLD+T7Tk8CNxIqTbJkxdY6zN+sS4QRT6uJU42Czkoi1L9vQPteoeo/NUhIWtD9D7wu1Bl/uUIzo+ajDln/fseMl8c= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dmarc=pass (p=reject dis=none) header.from=microchip.com; spf=pass smtp.mailfrom=microchip.com; dkim=pass (2048-bit key) header.d=microchip.com header.i=@microchip.com header.b=XMLkG7nv; arc=none smtp.client-ip=68.232.154.123 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=reject dis=none) header.from=microchip.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=microchip.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=microchip.com header.i=@microchip.com header.b="XMLkG7nv" DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=microchip.com; i=@microchip.com; q=dns/txt; s=mchp; t=1725870383; x=1757406383; h=from:to:cc:subject:date:message-id:in-reply-to: references:mime-version:content-transfer-encoding; bh=S7FYudartPoRxv7ei2GeIG0dTCpBW7Lavt39Fq1e7lM=; b=XMLkG7nvmZ3APQIvphsje7TohBgoiFd9q6tGaQlZREEdlY0vF3HzBMAT DI3S1HLN7OX2yu1+J6eWAUWdgQp3U2BeAl4lCI7epAtudE+IgmRHvSU/h i++6gndWd3ELWf+zg48xsqTfP+V1cYpNjHvjUm3rAlKVsLKHwQzWjCJDv BsrFgK4y/1/dUPsBM0H2yrcPgF+dCPsZiZD+eZtr0qu99fz9mbPb1eg73 4a3d10TYrUMKZh+zxw5PZgU+8mUMtKE4d4cS28rls3jZeneODSBIugkfc XEpMmhHBOCOft41wAn7NF5sdgx0lbrTxeD0wL/cmB5pmw7u+BRJPFDhxs Q==; X-CSE-ConnectionGUID: HYDxjUxJQbO7VSKlGAv2ag== X-CSE-MsgGUID: B9mJy37TRKyH1MnoTuHnMw== X-IronPort-AV: E=Sophos;i="6.10,213,1719903600"; d="scan'208";a="198939930" X-Amp-Result: SKIPPED(no attachment in message) Received: from unknown (HELO email.microchip.com) ([170.129.1.10]) by esa6.microchip.iphmx.com with ESMTP/TLS/ECDHE-RSA-AES128-GCM-SHA256; 09 Sep 2024 01:26:22 -0700 Received: from chn-vm-ex02.mchp-main.com (10.10.85.144) by chn-vm-ex01.mchp-main.com (10.10.85.143) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256) id 15.1.2507.35; Mon, 9 Sep 2024 01:26:10 -0700 Received: from che-ll-i17164.microchip.com (10.10.85.11) by chn-vm-ex02.mchp-main.com (10.10.85.144) with Microsoft SMTP Server id 15.1.2507.35 via Frontend Transport; Mon, 9 Sep 2024 01:26:00 -0700 From: Parthiban Veerasooran To: , , , , , , , , , , , , , , , , , , , CC: , , , , , , , , , , , , , , , , Parthiban Veerasooran Subject: [PATCH net-next v8 04/14] net: ethernet: oa_tc6: implement software reset Date: Mon, 9 Sep 2024 13:55:04 +0530 Message-ID: <20240909082514.262942-5-Parthiban.Veerasooran@microchip.com> X-Mailer: git-send-email 2.34.1 In-Reply-To: <20240909082514.262942-1-Parthiban.Veerasooran@microchip.com> References: <20240909082514.262942-1-Parthiban.Veerasooran@microchip.com> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset="utf-8" Reset complete bit is set when the MAC-PHY reset completes and ready for configuration. Additionally reset complete bit in the STS0 register has to be written by one upon reset complete to clear the interrupt. Reviewed-by: Andrew Lunn Signed-off-by: Parthiban Veerasooran --- drivers/net/ethernet/oa_tc6.c | 56 +++++++++++++++++++++++++++++++++++ 1 file changed, 56 insertions(+) diff --git a/drivers/net/ethernet/oa_tc6.c b/drivers/net/ethernet/oa_tc6.c index 72bab9234436..f774ed397213 100644 --- a/drivers/net/ethernet/oa_tc6.c +++ b/drivers/net/ethernet/oa_tc6.c @@ -6,8 +6,18 @@ */ =20 #include +#include #include =20 +/* OPEN Alliance TC6 registers */ +/* Reset Control and Status Register */ +#define OA_TC6_REG_RESET 0x0003 +#define RESET_SWRESET BIT(0) /* Software Reset */ + +/* Status Register #0 */ +#define OA_TC6_REG_STATUS0 0x0008 +#define STATUS0_RESETC BIT(6) /* Reset Complete */ + /* Control command header */ #define OA_TC6_CTRL_HEADER_DATA_NOT_CTRL BIT(31) #define OA_TC6_CTRL_HEADER_WRITE_NOT_READ BIT(29) @@ -24,6 +34,8 @@ (OA_TC6_CTRL_MAX_REGISTERS *\ OA_TC6_CTRL_REG_VALUE_SIZE) +\ OA_TC6_CTRL_IGNORED_SIZE) +#define STATUS0_RESETC_POLL_DELAY 1000 +#define STATUS0_RESETC_POLL_TIMEOUT 1000000 =20 /* Internal structure for MAC-PHY drivers */ struct oa_tc6 { @@ -279,6 +291,42 @@ int oa_tc6_write_register(struct oa_tc6 *tc6, u32 addr= ess, u32 value) } EXPORT_SYMBOL_GPL(oa_tc6_write_register); =20 +static int oa_tc6_read_status0(struct oa_tc6 *tc6) +{ + u32 regval; + int ret; + + ret =3D oa_tc6_read_register(tc6, OA_TC6_REG_STATUS0, ®val); + if (ret) { + dev_err(&tc6->spi->dev, "STATUS0 register read failed: %d\n", + ret); + return 0; + } + + return regval; +} + +static int oa_tc6_sw_reset_macphy(struct oa_tc6 *tc6) +{ + u32 regval =3D RESET_SWRESET; + int ret; + + ret =3D oa_tc6_write_register(tc6, OA_TC6_REG_RESET, regval); + if (ret) + return ret; + + /* Poll for soft reset complete for every 1ms until 1s timeout */ + ret =3D readx_poll_timeout(oa_tc6_read_status0, tc6, regval, + regval & STATUS0_RESETC, + STATUS0_RESETC_POLL_DELAY, + STATUS0_RESETC_POLL_TIMEOUT); + if (ret) + return -ENODEV; + + /* Clear the reset complete status */ + return oa_tc6_write_register(tc6, OA_TC6_REG_STATUS0, regval); +} + /** * oa_tc6_init - allocates and initializes oa_tc6 structure. * @spi: device with which data will be exchanged. @@ -289,6 +337,7 @@ EXPORT_SYMBOL_GPL(oa_tc6_write_register); struct oa_tc6 *oa_tc6_init(struct spi_device *spi) { struct oa_tc6 *tc6; + int ret; =20 tc6 =3D devm_kzalloc(&spi->dev, sizeof(*tc6), GFP_KERNEL); if (!tc6) @@ -313,6 +362,13 @@ struct oa_tc6 *oa_tc6_init(struct spi_device *spi) if (!tc6->spi_ctrl_rx_buf) return NULL; =20 + ret =3D oa_tc6_sw_reset_macphy(tc6); + if (ret) { + dev_err(&tc6->spi->dev, + "MAC-PHY software reset failed: %d\n", ret); + return NULL; + } + return tc6; } EXPORT_SYMBOL_GPL(oa_tc6_init); --=20 2.34.1