From patchwork Thu Apr 18 12:56:40 2024 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Parthiban Veerasooran X-Patchwork-Id: 13634697 X-Patchwork-Delegate: kuba@kernel.org Received: from esa.microchip.iphmx.com (esa.microchip.iphmx.com [68.232.153.233]) (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 297EF16078D; Thu, 18 Apr 2024 12:57:40 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=68.232.153.233 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1713445062; cv=none; b=jhhFmLyL541RlukDsEC+hDBgTx0ZcUFlJjR+Ne3nGRT/XxdvfKEFS9wD7bTjrL+VqO2mnIn68BNa2B7JPTmC3djR/1R3XGUoicWvKVbrR3UZAYvIlg/IRFlLnH1UIJ4F+QC1FuWDzbV6h4KIwiUgLGpzGv2piSnPTn0atuS6m9k= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1713445062; c=relaxed/simple; bh=CEwgfS9fMPtSKgy5H4AI/vG3K7fhtg+kYKJ1YnEtVsg=; h=From:To:CC:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version:Content-Type; b=Z5TXJzv0QmB6q4K8opsnL9Mc+rF9gA4bKb4rm4F2eQms837glz9DSX7Yvlxjy2N68tiGompkb7i2k961ixsX2nM/F1nt6JfOpPX5vwR3/lz8ppaljH2nSEpXZDlpiGge3gVQRiCG1NF4MyBczbM5UdT12f/FDw6xWphsFmQRULI= 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=ps+jACff; arc=none smtp.client-ip=68.232.153.233 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="ps+jACff" DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=microchip.com; i=@microchip.com; q=dns/txt; s=mchp; t=1713445061; x=1744981061; h=from:to:cc:subject:date:message-id:in-reply-to: references:mime-version:content-transfer-encoding; bh=CEwgfS9fMPtSKgy5H4AI/vG3K7fhtg+kYKJ1YnEtVsg=; b=ps+jACff9Ior38PcTs6v5tlIxswml2sQBzGkvVx580rZX/MS86vvZ5u8 WP9iiAX/cDDgZLBNJ3bELIzqgSmNwA5pvN3EtK0mxdia++QCjGIzLPK2p 1Hh70UGaBUqNmmMQ4aNMtjAOvD73qjvZ+n495yjzxEa+2fkGZo4kEwDVN wstmf+rlpUJRlSezy6E3TPgQGQAaVI1ZPs932Ew4nRd3234YdFg0AUQed KHTZB5D7tO0tZR0TzDq9VBroGKXeHamLWVKkATjBZglrTKlW9MN93focL 6Je6xL4JQhJioTKnTMzFWTd2OzR5pfxOzKHKlNZKgr5/isv9HLCSGRnD8 A==; X-CSE-ConnectionGUID: wIEpAzdhSGCIIYIJVV9X/Q== X-CSE-MsgGUID: 6a6cyb+/SoeYTnfNr1hPDg== X-IronPort-AV: E=Sophos;i="6.07,212,1708412400"; d="scan'208";a="23619637" X-Amp-Result: SKIPPED(no attachment in message) Received: from unknown (HELO email.microchip.com) ([170.129.1.10]) by esa1.microchip.iphmx.com with ESMTP/TLS/ECDHE-RSA-AES128-GCM-SHA256; 18 Apr 2024 05:57:39 -0700 Received: from chn-vm-ex02.mchp-main.com (10.10.85.144) by chn-vm-ex03.mchp-main.com (10.10.85.151) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256) id 15.1.2507.35; Thu, 18 Apr 2024 05:57:21 -0700 Received: from CHE-LT-I17164LX.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; Thu, 18 Apr 2024 05:57:13 -0700 From: Parthiban Veerasooran To: , , , , , , , , , , , , , , , , , , , CC: , , , , , , Parthiban Veerasooran Subject: [PATCH net-next v4 04/12] net: ethernet: oa_tc6: implement software reset Date: Thu, 18 Apr 2024 18:26:40 +0530 Message-ID: <20240418125648.372526-5-Parthiban.Veerasooran@microchip.com> X-Mailer: git-send-email 2.34.1 In-Reply-To: <20240418125648.372526-1-Parthiban.Veerasooran@microchip.com> References: <20240418125648.372526-1-Parthiban.Veerasooran@microchip.com> Precedence: bulk X-Mailing-List: netdev@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-Patchwork-Delegate: kuba@kernel.org 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. Signed-off-by: Parthiban Veerasooran --- drivers/net/ethernet/oa_tc6.c | 53 +++++++++++++++++++++++++++++++++++ 1 file changed, 53 insertions(+) diff --git a/drivers/net/ethernet/oa_tc6.c b/drivers/net/ethernet/oa_tc6.c index f563329912e2..4b0f63c02c35 100644 --- a/drivers/net/ethernet/oa_tc6.c +++ b/drivers/net/ethernet/oa_tc6.c @@ -6,8 +6,18 @@ */ #include +#include #include +/* 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 /* Internal structure for MAC-PHY drivers */ struct oa_tc6 { @@ -279,6 +291,39 @@ int oa_tc6_write_register(struct oa_tc6 *tc6, u32 address, u32 value) } EXPORT_SYMBOL_GPL(oa_tc6_write_register); +static int oa_tc6_read_status0(struct oa_tc6 *tc6) +{ + u32 regval; + int ret; + + ret = oa_tc6_read_register(tc6, OA_TC6_REG_STATUS0, ®val); + if (ret) + return 0; + + return regval; +} + +static int oa_tc6_sw_reset_macphy(struct oa_tc6 *tc6) +{ + u32 regval = RESET_SWRESET; + int ret; + + ret = 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 = 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 +334,7 @@ EXPORT_SYMBOL_GPL(oa_tc6_write_register); struct oa_tc6 *oa_tc6_init(struct spi_device *spi) { struct oa_tc6 *tc6; + int ret; tc6 = devm_kzalloc(&spi->dev, sizeof(*tc6), GFP_KERNEL); if (!tc6) @@ -311,6 +357,13 @@ struct oa_tc6 *oa_tc6_init(struct spi_device *spi) if (!tc6->spi_ctrl_rx_buf) return NULL; + ret = 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);