From patchwork Fri Jan 24 08:43:58 2014 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Geert Uytterhoeven X-Patchwork-Id: 3533651 Return-Path: X-Original-To: patchwork-linux-sh@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 1A054C02DC for ; Fri, 24 Jan 2014 08:49:35 +0000 (UTC) Received: from mail.kernel.org (localhost [127.0.0.1]) by mail.kernel.org (Postfix) with ESMTP id 3EC5C201B6 for ; Fri, 24 Jan 2014 08:49:30 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id BC5D920181 for ; Fri, 24 Jan 2014 08:49:28 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1752775AbaAXIsx (ORCPT ); Fri, 24 Jan 2014 03:48:53 -0500 Received: from andre.telenet-ops.be ([195.130.132.53]:38901 "EHLO andre.telenet-ops.be" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752420AbaAXIoR (ORCPT ); Fri, 24 Jan 2014 03:44:17 -0500 Received: from ayla.of.borg ([84.193.72.141]) by andre.telenet-ops.be with bizsmtp id HkkG1n00532ts5g01kkGbU; Fri, 24 Jan 2014 09:44:16 +0100 Received: from geert by ayla.of.borg with local (Exim 4.76) (envelope-from ) id 1W6cN5-00036w-Sl; Fri, 24 Jan 2014 09:44:15 +0100 From: Geert Uytterhoeven To: Mark Brown Cc: linux-spi@vger.kernel.org, linux-sh@vger.kernel.org, linux-kernel@vger.kernel.org, Geert Uytterhoeven Subject: [PATCH v3 08/14] spi: rspi: Add support for more than one interrupt Date: Fri, 24 Jan 2014 09:43:58 +0100 Message-Id: <1390553044-11860-9-git-send-email-geert@linux-m68k.org> X-Mailer: git-send-email 1.7.9.5 In-Reply-To: <1390553044-11860-1-git-send-email-geert@linux-m68k.org> References: <1390553044-11860-1-git-send-email-geert@linux-m68k.org> Sender: linux-sh-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-sh@vger.kernel.org X-Spam-Status: No, score=-7.5 required=5.0 tests=BAYES_00, RCVD_IN_DNSWL_HI, 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: Geert Uytterhoeven Add support for multiple interrupts, based on the SDK reference code. This is needed for RZ/A1H, which supports 3 interrupts. When using multiple interrupts, they must be called "rx" (SPRI) and "tx" (SPTI). The error interrupt (SPEI) is not used, as it matters for slave mode only. When using a single interrupt, it may be called "mux". If it cannot be found, the first interrupt in the device's resources will be used. Signed-off-by: Geert Uytterhoeven --- v2: - s/irq[]/irqs[]/ - s/numirq/num_irqs/ - Use unsigned int for loop counters that cannot be negative - Merge the platform_get_irq() and devm_request_irq() loops - Do not update copyright header in further untouched rspi.h v3: - Do not request the unused error interrupt - Add suffixes ":mux", ":rx" and ":tx" to the registered interrupt names - Use named interrupts drivers/spi/spi-rspi.c | 106 +++++++++++++++++++++++++++++++++++++++--------- 1 file changed, 87 insertions(+), 19 deletions(-) diff --git a/drivers/spi/spi-rspi.c b/drivers/spi/spi-rspi.c index 5d39cd3eba62..d2ade5e09f58 100644 --- a/drivers/spi/spi-rspi.c +++ b/drivers/spi/spi-rspi.c @@ -1,7 +1,7 @@ /* * SH RSPI driver * - * Copyright (C) 2012 Renesas Solutions Corp. + * Copyright (C) 2012, 2013 Renesas Solutions Corp. * * Based on spi-sh.c: * Copyright (C) 2011 Renesas Solutions Corp. @@ -183,12 +183,12 @@ struct rspi_data { struct clk *clk; u8 spsr; u16 spcmd; + int rx_irq, tx_irq; const struct spi_ops *ops; /* for dmaengine */ struct dma_chan *chan_tx; struct dma_chan *chan_rx; - int irq; unsigned dma_width_16bit:1; unsigned dma_callbacked:1; @@ -440,7 +440,7 @@ static int rspi_send_dma(struct rspi_data *rspi, struct spi_transfer *t) struct scatterlist sg; const void *buf = NULL; struct dma_async_tx_descriptor *desc; - unsigned len; + unsigned int len; int ret = 0; if (rspi->dma_width_16bit) { @@ -478,7 +478,7 @@ static int rspi_send_dma(struct rspi_data *rspi, struct spi_transfer *t) * DMAC needs SPTIE, but if SPTIE is set, this IRQ routine will be * called. So, this driver disables the IRQ while DMA transfer. */ - disable_irq(rspi->irq); + disable_irq(rspi->tx_irq); rspi_write8(rspi, rspi_read8(rspi, RSPI_SPCR) | SPCR_TXMD, RSPI_SPCR); rspi_enable_irq(rspi, SPCR_SPTIE); @@ -497,7 +497,7 @@ static int rspi_send_dma(struct rspi_data *rspi, struct spi_transfer *t) ret = -ETIMEDOUT; rspi_disable_irq(rspi, SPCR_SPTIE); - enable_irq(rspi->irq); + enable_irq(rspi->tx_irq); end: rspi_dma_unmap_sg(&sg, rspi->chan_tx, DMA_TO_DEVICE); @@ -536,7 +536,7 @@ static int rspi_receive_dma(struct rspi_data *rspi, struct spi_transfer *t) struct scatterlist sg, sg_dummy; void *dummy = NULL, *rx_buf = NULL; struct dma_async_tx_descriptor *desc, *desc_dummy; - unsigned len; + unsigned int len; int ret = 0; if (rspi->dma_width_16bit) { @@ -594,7 +594,9 @@ static int rspi_receive_dma(struct rspi_data *rspi, struct spi_transfer *t) * DMAC needs SPTIE, but if SPTIE is set, this IRQ routine will be * called. So, this driver disables the IRQ while DMA transfer. */ - disable_irq(rspi->irq); + disable_irq(rspi->tx_irq); + if (rspi->rx_irq != rspi->tx_irq) + disable_irq(rspi->rx_irq); rspi_write8(rspi, rspi_read8(rspi, RSPI_SPCR) & ~SPCR_TXMD, RSPI_SPCR); rspi_enable_irq(rspi, SPCR_SPTIE | SPCR_SPRIE); @@ -617,7 +619,9 @@ static int rspi_receive_dma(struct rspi_data *rspi, struct spi_transfer *t) ret = -ETIMEDOUT; rspi_disable_irq(rspi, SPCR_SPTIE | SPCR_SPRIE); - enable_irq(rspi->irq); + enable_irq(rspi->tx_irq); + if (rspi->rx_irq != rspi->tx_irq) + enable_irq(rspi->rx_irq); end: rspi_dma_unmap_sg(&sg, rspi->chan_rx, DMA_FROM_DEVICE); @@ -775,7 +779,7 @@ static int rspi_unprepare_message(struct spi_master *master, return 0; } -static irqreturn_t rspi_irq(int irq, void *_sr) +static irqreturn_t rspi_irq_mux(int irq, void *_sr) { struct rspi_data *rspi = _sr; u8 spsr; @@ -797,6 +801,36 @@ static irqreturn_t rspi_irq(int irq, void *_sr) return ret; } +static irqreturn_t rspi_irq_rx(int irq, void *_sr) +{ + struct rspi_data *rspi = _sr; + u8 spsr; + + rspi->spsr = spsr = rspi_read8(rspi, RSPI_SPSR); + if (spsr & SPSR_SPRF) { + rspi_disable_irq(rspi, SPCR_SPRIE); + wake_up(&rspi->wait); + return IRQ_HANDLED; + } + + return 0; +} + +static irqreturn_t rspi_irq_tx(int irq, void *_sr) +{ + struct rspi_data *rspi = _sr; + u8 spsr; + + rspi->spsr = spsr = rspi_read8(rspi, RSPI_SPSR); + if (spsr & SPSR_SPTEF) { + rspi_disable_irq(rspi, SPCR_SPTIE); + wake_up(&rspi->wait); + return IRQ_HANDLED; + } + + return 0; +} + static int rspi_request_dma(struct rspi_data *rspi, struct platform_device *pdev) { @@ -868,12 +902,25 @@ static int rspi_remove(struct platform_device *pdev) return 0; } +static int rspi_request_irq(struct device *dev, unsigned int irq, + irq_handler_t handler, const char *suffix, + void *dev_id) +{ + const char *base = dev_name(dev); + size_t len = strlen(base) + strlen(suffix) + 2; + char *name = devm_kzalloc(dev, len, GFP_KERNEL); + if (!name) + return -ENOMEM; + snprintf(name, len, "%s:%s", base, suffix); + return devm_request_irq(dev, irq, handler, 0, name, dev_id); +} + static int rspi_probe(struct platform_device *pdev) { struct resource *res; struct spi_master *master; struct rspi_data *rspi; - int ret, irq; + int ret; char clk_name[16]; const struct rspi_plat_data *rspi_pd = dev_get_platdata(&pdev->dev); const struct spi_ops *ops; @@ -886,12 +933,6 @@ static int rspi_probe(struct platform_device *pdev) return -ENODEV; } - irq = platform_get_irq(pdev, 0); - if (irq < 0) { - dev_err(&pdev->dev, "platform_get_irq error\n"); - return -ENODEV; - } - master = spi_alloc_master(&pdev->dev, sizeof(struct rspi_data)); if (master == NULL) { dev_err(&pdev->dev, "spi_alloc_master error.\n"); @@ -934,14 +975,41 @@ static int rspi_probe(struct platform_device *pdev) master->unprepare_message = rspi_unprepare_message; master->mode_bits = SPI_CPHA | SPI_CPOL; - ret = devm_request_irq(&pdev->dev, irq, rspi_irq, 0, - dev_name(&pdev->dev), rspi); + ret = platform_get_irq_byname(pdev, "rx"); + if (ret < 0) { + ret = platform_get_irq_byname(pdev, "mux"); + if (ret < 0) + ret = platform_get_irq(pdev, 0); + if (ret >= 0) + rspi->rx_irq = rspi->tx_irq = ret; + } else { + rspi->rx_irq = ret; + ret = platform_get_irq_byname(pdev, "tx"); + if (ret >= 0) + rspi->tx_irq = ret; + } + if (ret < 0) { + dev_err(&pdev->dev, "platform_get_irq error\n"); + goto error2; + } + + if (rspi->rx_irq == rspi->tx_irq) { + /* Single multiplexed interrupt */ + ret = rspi_request_irq(&pdev->dev, rspi->rx_irq, rspi_irq_mux, + "mux", rspi); + } else { + /* Multi-interrupt mode, only SPRI and SPTI are used */ + ret = rspi_request_irq(&pdev->dev, rspi->rx_irq, rspi_irq_rx, + "rx", rspi); + if (!ret) + ret = rspi_request_irq(&pdev->dev, rspi->tx_irq, + rspi_irq_tx, "tx", rspi); + } if (ret < 0) { dev_err(&pdev->dev, "request_irq error\n"); goto error2; } - rspi->irq = irq; ret = rspi_request_dma(rspi, pdev); if (ret < 0) { dev_err(&pdev->dev, "rspi_request_dma failed.\n");