From patchwork Wed Aug 16 11:21:11 2017 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Mark Brown X-Patchwork-Id: 9903475 Return-Path: Received: from mail.wl.linuxfoundation.org (pdx-wl-mail.web.codeaurora.org [172.30.200.125]) by pdx-korg-patchwork.web.codeaurora.org (Postfix) with ESMTP id 7BBBD6088A for ; Wed, 16 Aug 2017 11:21:21 +0000 (UTC) Received: from mail.wl.linuxfoundation.org (localhost [127.0.0.1]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id 6DFEC28520 for ; Wed, 16 Aug 2017 11:21:21 +0000 (UTC) Received: by mail.wl.linuxfoundation.org (Postfix, from userid 486) id 62F722898F; Wed, 16 Aug 2017 11:21:21 +0000 (UTC) X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on pdx-wl-mail.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-6.8 required=2.0 tests=BAYES_00,DKIM_SIGNED, RCVD_IN_DNSWL_HI,T_DKIM_INVALID autolearn=ham version=3.3.1 Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id 3D8D5289A7 for ; Wed, 16 Aug 2017 11:21:19 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1751287AbdHPLVR (ORCPT ); Wed, 16 Aug 2017 07:21:17 -0400 Received: from heliosphere.sirena.org.uk ([172.104.155.198]:37670 "EHLO heliosphere.sirena.org.uk" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752360AbdHPLVQ (ORCPT ); Wed, 16 Aug 2017 07:21:16 -0400 DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=sirena.org.uk; s=20170815-heliosphere; h=Date:Message-Id:In-Reply-To: Subject:Cc:To:From:Sender:Reply-To:MIME-Version:Content-Type: Content-Transfer-Encoding:Content-ID:Content-Description:Resent-Date: Resent-From:Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID:References: List-Id:List-Help:List-Unsubscribe:List-Subscribe:List-Post:List-Owner: List-Archive; bh=oIxfC79DbMgkVKBYnbaDoGIQOO97hRzvgG4qJKEonoA=; b=it5u1F8aJoJr xErwX0Qyq6wam/oZgU44A+BMwCGWeM9IQW7Y7nb0AB7NjSWwzFikEO/ysDhwWbk1GkJXUUaXbH2mx kVn+ZG+HQwnn4oioP7xjJ828VKFtH9NHWLL9om77GWTTXIRjkmbJE37R6BpZATS3t8PfSY9kXv5fZ VjF7Q=; Received: from [2001:470:1f1d:6b5:7e7a:91ff:fede:4a45] (helo=finisterre) by heliosphere.sirena.org.uk with esmtpsa (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.89) (envelope-from ) id 1dhwNr-0004DY-UE; Wed, 16 Aug 2017 11:21:11 +0000 Received: from broonie by finisterre with local (Exim 4.89) (envelope-from ) id 1dhwNr-0003kF-EL; Wed, 16 Aug 2017 12:21:11 +0100 From: Mark Brown To: Lars-Peter Clausen Cc: Mark Brown , Mark Brown , Thomas Chou , linux-spi@vger.kernel.org, linux-spi@vger.kernel.org Subject: Applied "spi: altera: Switch to SPI core transfer queue management" to the spi tree In-Reply-To: <20170816093312.23048-1-lars@metafoo.de> Message-Id: Date: Wed, 16 Aug 2017 12:21:11 +0100 Sender: linux-spi-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-spi@vger.kernel.org X-Virus-Scanned: ClamAV using ClamSMTP The patch spi: altera: Switch to SPI core transfer queue management has been applied to the spi tree at git://git.kernel.org/pub/scm/linux/kernel/git/broonie/spi.git All being well this means that it will be integrated into the linux-next tree (usually sometime in the next 24 hours) and sent to Linus during the next merge window (or sooner if it is a bug fix), however if problems are discovered then the patch may be dropped or reverted. You may get further e-mails resulting from automated or manual testing and review of the tree, please engage with people reporting problems and send followup patches addressing any issues that are reported if needed. If any updates are required or you are submitting further changes they should be sent as incremental updates against current git, existing patches will not be replaced. Please add any relevant lists and maintainers to the CCs when replying to this mail. Thanks, Mark From e19b63cd3cb7ebf1ca73d9c4f58934149337ed24 Mon Sep 17 00:00:00 2001 From: Lars-Peter Clausen Date: Wed, 16 Aug 2017 11:33:11 +0200 Subject: [PATCH] spi: altera: Switch to SPI core transfer queue management The Altera SPI driver currently uses the spi-bitbang infrastructure for transfer queue management, but non of the bitbang functionality itself. This is because when the driver was written this was the only way to not have to do queue management in the driver itself. Nowadays transfer queue management is available from the SPI driver core itself and using the bitbang infrastructure just adds an additional level of indirection. Switch the driver over to using the core queue management directly. Signed-off-by: Lars-Peter Clausen Signed-off-by: Mark Brown --- drivers/spi/Kconfig | 1 - drivers/spi/spi-altera.c | 94 ++++++++++++++---------------------------------- 2 files changed, 27 insertions(+), 68 deletions(-) diff --git a/drivers/spi/Kconfig b/drivers/spi/Kconfig index 9b31351fe429..acf566f06241 100644 --- a/drivers/spi/Kconfig +++ b/drivers/spi/Kconfig @@ -55,7 +55,6 @@ comment "SPI Master Controller Drivers" config SPI_ALTERA tristate "Altera SPI Controller" - select SPI_BITBANG help This is the driver for the Altera SPI Controller. diff --git a/drivers/spi/spi-altera.c b/drivers/spi/spi-altera.c index b95010e72452..bfac34068999 100644 --- a/drivers/spi/spi-altera.c +++ b/drivers/spi/spi-altera.c @@ -18,7 +18,6 @@ #include #include #include -#include #include #include @@ -45,10 +44,6 @@ #define ALTERA_SPI_CONTROL_SSO_MSK 0x400 struct altera_spi { - /* bitbang has to be first */ - struct spi_bitbang bitbang; - struct completion done; - void __iomem *base; int irq; int len; @@ -66,39 +61,18 @@ static inline struct altera_spi *altera_spi_to_hw(struct spi_device *sdev) return spi_master_get_devdata(sdev->master); } -static void altera_spi_chipsel(struct spi_device *spi, int value) +static void altera_spi_set_cs(struct spi_device *spi, bool is_high) { struct altera_spi *hw = altera_spi_to_hw(spi); - if (spi->mode & SPI_CS_HIGH) { - switch (value) { - case BITBANG_CS_INACTIVE: - writel(1 << spi->chip_select, - hw->base + ALTERA_SPI_SLAVE_SEL); - hw->imr |= ALTERA_SPI_CONTROL_SSO_MSK; - writel(hw->imr, hw->base + ALTERA_SPI_CONTROL); - break; - - case BITBANG_CS_ACTIVE: - hw->imr &= ~ALTERA_SPI_CONTROL_SSO_MSK; - writel(hw->imr, hw->base + ALTERA_SPI_CONTROL); - writel(0, hw->base + ALTERA_SPI_SLAVE_SEL); - break; - } + if (is_high) { + hw->imr &= ~ALTERA_SPI_CONTROL_SSO_MSK; + writel(hw->imr, hw->base + ALTERA_SPI_CONTROL); + writel(0, hw->base + ALTERA_SPI_SLAVE_SEL); } else { - switch (value) { - case BITBANG_CS_INACTIVE: - hw->imr &= ~ALTERA_SPI_CONTROL_SSO_MSK; - writel(hw->imr, hw->base + ALTERA_SPI_CONTROL); - break; - - case BITBANG_CS_ACTIVE: - writel(1 << spi->chip_select, - hw->base + ALTERA_SPI_SLAVE_SEL); - hw->imr |= ALTERA_SPI_CONTROL_SSO_MSK; - writel(hw->imr, hw->base + ALTERA_SPI_CONTROL); - break; - } + writel(BIT(spi->chip_select), hw->base + ALTERA_SPI_SLAVE_SEL); + hw->imr |= ALTERA_SPI_CONTROL_SSO_MSK; + writel(hw->imr, hw->base + ALTERA_SPI_CONTROL); } } @@ -116,9 +90,10 @@ static inline unsigned int hw_txbyte(struct altera_spi *hw, int count) return 0; } -static int altera_spi_txrx(struct spi_device *spi, struct spi_transfer *t) +static int altera_spi_txrx(struct spi_master *master, + struct spi_device *spi, struct spi_transfer *t) { - struct altera_spi *hw = altera_spi_to_hw(spi); + struct altera_spi *hw = spi_master_get_devdata(master); hw->tx = t->tx_buf; hw->rx = t->rx_buf; @@ -133,11 +108,6 @@ static int altera_spi_txrx(struct spi_device *spi, struct spi_transfer *t) /* send the first byte */ writel(hw_txbyte(hw, 0), hw->base + ALTERA_SPI_TXDATA); - - wait_for_completion(&hw->done); - /* disable receive interrupt */ - hw->imr &= ~ALTERA_SPI_CONTROL_IRRDY_MSK; - writel(hw->imr, hw->base + ALTERA_SPI_CONTROL); } else { while (hw->count < hw->len) { unsigned int rxd; @@ -164,14 +134,16 @@ static int altera_spi_txrx(struct spi_device *spi, struct spi_transfer *t) hw->count++; } + spi_finalize_current_transfer(master); } - return hw->count * hw->bytes_per_word; + return t->len; } static irqreturn_t altera_spi_irq(int irq, void *dev) { - struct altera_spi *hw = dev; + struct spi_master *master = dev; + struct altera_spi *hw = spi_master_get_devdata(master); unsigned int rxd; rxd = readl(hw->base + ALTERA_SPI_RXDATA); @@ -189,10 +161,15 @@ static irqreturn_t altera_spi_irq(int irq, void *dev) hw->count++; - if (hw->count < hw->len) + if (hw->count < hw->len) { writel(hw_txbyte(hw, hw->count), hw->base + ALTERA_SPI_TXDATA); - else - complete(&hw->done); + } else { + /* disable receive interrupt */ + hw->imr &= ~ALTERA_SPI_CONTROL_IRRDY_MSK; + writel(hw->imr, hw->base + ALTERA_SPI_CONTROL); + + spi_finalize_current_transfer(master); + } return IRQ_HANDLED; } @@ -214,14 +191,10 @@ static int altera_spi_probe(struct platform_device *pdev) master->mode_bits = SPI_CS_HIGH; master->bits_per_word_mask = SPI_BPW_RANGE_MASK(1, 16); master->dev.of_node = pdev->dev.of_node; + master->transfer_one = altera_spi_txrx; + master->set_cs = altera_spi_set_cs; hw = spi_master_get_devdata(master); - platform_set_drvdata(pdev, hw); - - /* setup the state for the bitbang driver */ - hw->bitbang.master = master; - hw->bitbang.chipselect = altera_spi_chipsel; - hw->bitbang.txrx_bufs = altera_spi_txrx; /* find and map our resources */ res = platform_get_resource(pdev, IORESOURCE_MEM, 0); @@ -239,15 +212,13 @@ static int altera_spi_probe(struct platform_device *pdev) /* irq is optional */ hw->irq = platform_get_irq(pdev, 0); if (hw->irq >= 0) { - init_completion(&hw->done); err = devm_request_irq(&pdev->dev, hw->irq, altera_spi_irq, 0, - pdev->name, hw); + pdev->name, master); if (err) goto exit; } - /* register our spi controller */ - err = spi_bitbang_start(&hw->bitbang); + err = devm_spi_register_master(&pdev->dev, master); if (err) goto exit; dev_info(&pdev->dev, "base %p, irq %d\n", hw->base, hw->irq); @@ -258,16 +229,6 @@ static int altera_spi_probe(struct platform_device *pdev) return err; } -static int altera_spi_remove(struct platform_device *dev) -{ - struct altera_spi *hw = platform_get_drvdata(dev); - struct spi_master *master = hw->bitbang.master; - - spi_bitbang_stop(&hw->bitbang); - spi_master_put(master); - return 0; -} - #ifdef CONFIG_OF static const struct of_device_id altera_spi_match[] = { { .compatible = "ALTR,spi-1.0", }, @@ -279,7 +240,6 @@ MODULE_DEVICE_TABLE(of, altera_spi_match); static struct platform_driver altera_spi_driver = { .probe = altera_spi_probe, - .remove = altera_spi_remove, .driver = { .name = DRV_NAME, .pm = NULL,