From patchwork Thu Aug 28 06:53:39 2014 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Simon Horman X-Patchwork-Id: 4799761 Return-Path: X-Original-To: patchwork-ltsi-dev@patchwork.kernel.org Delivered-To: patchwork-parsemail@patchwork2.web.kernel.org Received: from mail.kernel.org (mail.kernel.org [198.145.19.201]) by patchwork2.web.kernel.org (Postfix) with ESMTP id 9AEBDC0338 for ; Thu, 28 Aug 2014 08:39:31 +0000 (UTC) Received: from mail.kernel.org (localhost [127.0.0.1]) by mail.kernel.org (Postfix) with ESMTP id C3234201FE for ; Thu, 28 Aug 2014 08:39:30 +0000 (UTC) Received: from mail.linuxfoundation.org (mail.linuxfoundation.org [140.211.169.12]) (using TLSv1.2 with cipher DHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPS id A03DA201F7 for ; Thu, 28 Aug 2014 08:39:28 +0000 (UTC) Received: from mail.linux-foundation.org (localhost [127.0.0.1]) by mail.linuxfoundation.org (Postfix) with ESMTP id 70F6715B8; Thu, 28 Aug 2014 07:35:32 +0000 (UTC) X-Original-To: ltsi-dev@lists.linuxfoundation.org Delivered-To: ltsi-dev@mail.linuxfoundation.org Received: from smtp1.linuxfoundation.org (smtp1.linux-foundation.org [172.17.192.35]) by mail.linuxfoundation.org (Postfix) with ESMTPS id 04903BCB for ; Thu, 28 Aug 2014 07:34:57 +0000 (UTC) X-Greylist: from auto-whitelisted by SQLgrey-1.7.6 Received: from kirsty.vergenet.net (kirsty.vergenet.net [202.4.237.240]) by smtp1.linuxfoundation.org (Postfix) with ESMTP id 863AE201B4 for ; Thu, 28 Aug 2014 07:34:56 +0000 (UTC) Received: from ayumi.isobedori.kobe.vergenet.net (p4222-ipbfp1605kobeminato.hyogo.ocn.ne.jp [114.154.95.222]) by kirsty.vergenet.net (Postfix) with ESMTP id EA5C72671A3; Thu, 28 Aug 2014 17:07:40 +1000 (EST) Received: by ayumi.isobedori.kobe.vergenet.net (Postfix, from userid 7100) id 72DF9EDE5ED; Thu, 28 Aug 2014 16:07:39 +0900 (JST) From: Simon Horman To: ltsi-dev@lists.linuxfoundation.org Date: Thu, 28 Aug 2014 15:53:39 +0900 Message-Id: <1409209620-24487-94-git-send-email-horms+renesas@verge.net.au> X-Mailer: git-send-email 2.0.1 In-Reply-To: <1409209620-24487-1-git-send-email-horms+renesas@verge.net.au> References: <1409209620-24487-1-git-send-email-horms+renesas@verge.net.au> X-Spam-Status: No, score=-4.2 required=5.0 tests=BAYES_00, RCVD_IN_DNSWL_MED, RP_MATCHES_RCVD, UNPARSEABLE_RELAY autolearn=unavailable version=3.3.1 X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on mail.kernel.org Cc: Magnus Damm Subject: [LTSI-dev] [PATCH LTSI-3.14 093/894] spi: rspi: Add support for loopback mode X-BeenThere: ltsi-dev@lists.linuxfoundation.org X-Mailman-Version: 2.1.12 Precedence: list List-Id: "A list to discuss patches, development, and other things related to the LTSI project" List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , MIME-Version: 1.0 Sender: ltsi-dev-bounces@lists.linuxfoundation.org Errors-To: ltsi-dev-bounces@lists.linuxfoundation.org X-Virus-Scanned: ClamAV using ClamSMTP From: Geert Uytterhoeven Add support for specifying loopback mode. Signed-off-by: Geert Uytterhoeven Signed-off-by: Mark Brown (cherry picked from commit 06a7a3cff042a36fb7e6af71039a17c6d1a6d90f) Signed-off-by: Simon Horman --- drivers/spi/spi-rspi.c | 22 ++++++++++++++-------- 1 file changed, 14 insertions(+), 8 deletions(-) diff --git a/drivers/spi/spi-rspi.c b/drivers/spi/spi-rspi.c index 0c75569..28db877 100644 --- a/drivers/spi/spi-rspi.c +++ b/drivers/spi/spi-rspi.c @@ -183,8 +183,9 @@ struct rspi_data { struct spi_master *master; wait_queue_head_t wait; struct clk *clk; - u8 spsr; u16 spcmd; + u8 spsr; + u8 sppcr; int rx_irq, tx_irq; const struct spi_ops *ops; @@ -252,8 +253,8 @@ static int rspi_set_config_register(struct rspi_data *rspi, int access_size) { int spbr; - /* Sets output mode(CMOS) and MOSI signal(from previous transfer) */ - rspi_write8(rspi, 0x00, RSPI_SPPCR); + /* Sets output mode, MOSI signal, and (optionally) loopback */ + rspi_write8(rspi, rspi->sppcr, RSPI_SPPCR); /* Sets transfer bit rate */ spbr = clk_get_rate(rspi->clk) / (2 * rspi->max_speed_hz) - 1; @@ -288,8 +289,8 @@ static int rspi_rz_set_config_register(struct rspi_data *rspi, int access_size) { int spbr; - /* Sets output mode */ - rspi_write8(rspi, 0x00, RSPI_SPPCR); + /* Sets output mode, MOSI signal, and (optionally) loopback */ + rspi_write8(rspi, rspi->sppcr, RSPI_SPPCR); /* Sets transfer bit rate */ spbr = clk_get_rate(rspi->clk) / (2 * rspi->max_speed_hz) - 1; @@ -322,8 +323,8 @@ static int qspi_set_config_register(struct rspi_data *rspi, int access_size) u16 spcmd; int spbr; - /* Sets output mode(CMOS) and MOSI signal(from previous transfer) */ - rspi_write8(rspi, 0x00, RSPI_SPPCR); + /* Sets output mode, MOSI signal, and (optionally) loopback */ + rspi_write8(rspi, rspi->sppcr, RSPI_SPPCR); /* Sets transfer bit rate */ spbr = clk_get_rate(rspi->clk) / (2 * rspi->max_speed_hz); @@ -829,6 +830,11 @@ static int rspi_setup(struct spi_device *spi) if (spi->mode & SPI_CPHA) rspi->spcmd |= SPCMD_CPHA; + /* CMOS output mode and MOSI signal from previous transfer */ + rspi->sppcr = 0; + if (spi->mode & SPI_LOOP) + rspi->sppcr |= SPPCR_SPLP; + set_config_register(rspi, 8); return 0; @@ -1050,7 +1056,7 @@ static int rspi_probe(struct platform_device *pdev) master->cleanup = rspi_cleanup; master->prepare_message = rspi_prepare_message; master->unprepare_message = rspi_unprepare_message; - master->mode_bits = SPI_CPHA | SPI_CPOL; + master->mode_bits = SPI_CPHA | SPI_CPOL | SPI_LOOP; ret = platform_get_irq_byname(pdev, "rx"); if (ret < 0) {