From patchwork Sun Nov 1 14:41:39 2015 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Anton Bondarenko X-Patchwork-Id: 7532301 Return-Path: X-Original-To: patchwork-linux-spi@patchwork.kernel.org Delivered-To: patchwork-parsemail@patchwork1.web.kernel.org Received: from mail.kernel.org (mail.kernel.org [198.145.29.136]) by patchwork1.web.kernel.org (Postfix) with ESMTP id 30B4E9F2F7 for ; Sun, 1 Nov 2015 14:44:09 +0000 (UTC) Received: from mail.kernel.org (localhost [127.0.0.1]) by mail.kernel.org (Postfix) with ESMTP id 47173206C0 for ; Sun, 1 Nov 2015 14:44:08 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 5C623206BD for ; Sun, 1 Nov 2015 14:44:07 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1752801AbbKAOmc (ORCPT ); Sun, 1 Nov 2015 09:42:32 -0500 Received: from mail-lb0-f181.google.com ([209.85.217.181]:36654 "EHLO mail-lb0-f181.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752703AbbKAOlu (ORCPT ); Sun, 1 Nov 2015 09:41:50 -0500 Received: by lbjm5 with SMTP id m5so73480125lbj.3; Sun, 01 Nov 2015 06:41:49 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20120113; h=from:to:cc:subject:date:message-id:in-reply-to:references; bh=ga+oaUpiSxeL0hrcL0ieWL0zrS2vMDa04FjnM/QkNqY=; b=xEHi2HV6tAnYwgPZaYm5O6Aoobo9hiC+fo9626GVW/smxIOFmZKdBaJyHvzI4O5GLp rPsoyfJDw7+AF3or8GIkxYReG9NWlSM/OvUG7h/TMNAfeMCbKJdzkX+GpoonyDazgGVq bWK5EZljwTTuKz7U7HUaWbKa7F1sI25pD1amkjBiEnVumLWaLSyhXAODvmzGFJa9a9CY cn0N/6I0+NYEPBgPr4QrHLii65Ux+DWx32cLOxumXYMphXlGyPWi1/rk1m7rsYwis1xl 5+IPXEMynaupdNB43knZnWNbDAWSq0+1HrsiefBcXk84+1M4riBuavYRb9PLmLyZuGeN BMAA== X-Received: by 10.112.129.200 with SMTP id ny8mr7951071lbb.10.1446388908724; Sun, 01 Nov 2015 06:41:48 -0800 (PST) Received: from localhost.localdomain (c-89-233-200-205.cust.bredband2.com. [89.233.200.205]) by smtp.gmail.com with ESMTPSA id oy8sm3091607lbb.39.2015.11.01.06.41.47 (version=TLSv1.2 cipher=ECDHE-RSA-AES128-SHA bits=128/128); Sun, 01 Nov 2015 06:41:48 -0800 (PST) From: Anton Bondarenko To: broonie@kernel.org, b38343@freescale.com Cc: linux-kernel@vger.kernel.org, linux-spi@vger.kernel.org, linux-arm-kernel@lists.infradead.org, vladimir_zapolskiy@mentor.com, jiada_wang@mentor.com, s.hauer@pengutronix.de Subject: [PATCH v3 5/7] spi: imx: Add support for loopback for ECSPI controllers Date: Sun, 1 Nov 2015 15:41:39 +0100 Message-Id: <1446388901-6073-6-git-send-email-anton.bondarenko.sama@gmail.com> X-Mailer: git-send-email 2.6.2 In-Reply-To: <1446388901-6073-1-git-send-email-anton.bondarenko.sama@gmail.com> References: <1446388901-6073-1-git-send-email-anton.bondarenko.sama@gmail.com> Sender: linux-spi-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-spi@vger.kernel.org X-Spam-Status: No, score=-6.8 required=5.0 tests=BAYES_00, DKIM_ADSP_CUSTOM_MED, DKIM_SIGNED, FREEMAIL_FROM, RCVD_IN_DNSWL_HI, T_DKIM_INVALID, T_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 X-Virus-Scanned: ClamAV using ClamSMTP From: Anton Bondarenko Support for ECSPI loopback for IMX51,IMX53 and IMX6Q using TEST register. Signed-off-by: Mohsin Kazmi Signed-off-by: Anton Bondarenko --- drivers/spi/spi-imx.c | 19 ++++++++++++++++--- 1 file changed, 16 insertions(+), 3 deletions(-) diff --git a/drivers/spi/spi-imx.c b/drivers/spi/spi-imx.c index 48fdfa1..dc492e2 100644 --- a/drivers/spi/spi-imx.c +++ b/drivers/spi/spi-imx.c @@ -270,6 +270,9 @@ static bool spi_imx_can_dma(struct spi_master *master, struct spi_device *spi, #define MX51_ECSPI_STAT 0x18 #define MX51_ECSPI_STAT_RR (1 << 3) +#define MX51_ECSPI_TEST 0x20 +#define MX51_ECSPI_LOOP BIT(31) + /* MX51 eCSPI */ static unsigned int mx51_ecspi_clkdiv(unsigned int fin, unsigned int fspi, unsigned int *fres) @@ -343,6 +346,7 @@ static int __maybe_unused mx51_ecspi_config(struct spi_imx_data *spi_imx, u32 ctrl = MX51_ECSPI_CTRL_ENABLE, dma = 0; u32 cfg = readl(spi_imx->base + MX51_ECSPI_CONFIG); u32 delay; + u32 lpb = 0; /* * The hardware seems to have a race condition when changing modes. The @@ -385,6 +389,12 @@ static int __maybe_unused mx51_ecspi_config(struct spi_imx_data *spi_imx, writel(ctrl, spi_imx->base + MX51_ECSPI_CTRL); writel(cfg, spi_imx->base + MX51_ECSPI_CONFIG); + if (config->mode & SPI_LOOP) + lpb |= MX51_ECSPI_LOOP; + + if ((readl(spi_imx->base + MX51_ECSPI_TEST) & MX51_ECSPI_LOOP) != lpb) + writel(lpb, spi_imx->base + MX51_ECSPI_TEST); + /* * Wait until the changes in the configuration register CONFIGREG * propagate into the hardware. It takes exactly one tick of the @@ -1262,6 +1272,9 @@ static int spi_imx_probe(struct platform_device *pdev) spi_imx = spi_master_get_devdata(master); spi_imx->bitbang.master = master; + spi_imx->devtype_data = of_id ? of_id->data : + (struct spi_imx_devtype_data *)pdev->id_entry->driver_data; + for (i = 0; i < master->num_chipselect; i++) { int cs_gpio = of_get_named_gpio(np, "cs-gpios", i); if (!gpio_is_valid(cs_gpio) && mxc_platform_info) @@ -1288,10 +1301,10 @@ static int spi_imx_probe(struct platform_device *pdev) spi_imx->bitbang.master->unprepare_message = spi_imx_unprepare_message; spi_imx->bitbang.master->mode_bits = SPI_CPOL | SPI_CPHA | SPI_CS_HIGH; - init_completion(&spi_imx->xfer_done); + if (is_imx51_ecspi(spi_imx)) + spi_imx->bitbang.master->mode_bits |= SPI_LOOP; - spi_imx->devtype_data = of_id ? of_id->data : - (struct spi_imx_devtype_data *) pdev->id_entry->driver_data; + init_completion(&spi_imx->xfer_done); res = platform_get_resource(pdev, IORESOURCE_MEM, 0); spi_imx->base = devm_ioremap_resource(&pdev->dev, res);