Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1751946AbdG1Gxv (ORCPT ); Fri, 28 Jul 2017 02:53:51 -0400 Received: from smtp.codeaurora.org ([198.145.29.96]:35892 "EHLO smtp.codeaurora.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751606AbdG1Gxq (ORCPT ); Fri, 28 Jul 2017 02:53:46 -0400 DMARC-Filter: OpenDMARC Filter v1.3.2 smtp.codeaurora.org 97DF560A07 Authentication-Results: pdx-caf-mail.web.codeaurora.org; dmarc=none (p=none dis=none) header.from=codeaurora.org Authentication-Results: pdx-caf-mail.web.codeaurora.org; spf=none smtp.mailfrom=varada@codeaurora.org From: Varadarajan Narayanan To: broonie@kernel.org, robh+dt@kernel.org, mark.rutland@arm.com, andy.gross@linaro.org, david.brown@linaro.org, linux-spi@vger.kernel.org, devicetree@vger.kernel.org, linux-kernel@vger.kernel.org, linux-arm-msm@vger.kernel.org, linux-soc@vger.kernel.org Cc: Varadarajan Narayanan , Matthew McClintock Subject: [PATCH v6 08/14] spi: qup: refactor spi_qup_io_config into two functions Date: Fri, 28 Jul 2017 12:22:55 +0530 Message-Id: <1501224781-19519-9-git-send-email-varada@codeaurora.org> X-Mailer: git-send-email 1.9.1 In-Reply-To: <1501224781-19519-1-git-send-email-varada@codeaurora.org> References: <1501224781-19519-1-git-send-email-varada@codeaurora.org> Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 5502 Lines: 158 This is in preparation for handling transactions larger than 64K-1 bytes in block mode, which is currently unsupported and quietly fails. We need to break these into two functions 1) prep is called once per spi_message and 2) io_config is called once per spi-qup bus transaction This is just refactoring, there should be no functional change Signed-off-by: Matthew McClintock Signed-off-by: Varadarajan Narayanan --- drivers/spi/spi-qup.c | 91 +++++++++++++++++++++++++++++++++++---------------- 1 file changed, 62 insertions(+), 29 deletions(-) diff --git a/drivers/spi/spi-qup.c b/drivers/spi/spi-qup.c index 8cfa112..ff5aa08 100644 --- a/drivers/spi/spi-qup.c +++ b/drivers/spi/spi-qup.c @@ -545,12 +545,11 @@ static irqreturn_t spi_qup_qup_irq(int irq, void *dev_id) return IRQ_HANDLED; } -/* set clock freq ... bits per word */ -static int spi_qup_io_config(struct spi_device *spi, struct spi_transfer *xfer) +/* set clock freq ... bits per word, determine mode */ +static int spi_qup_io_prep(struct spi_device *spi, struct spi_transfer *xfer) { struct spi_qup *controller = spi_master_get_devdata(spi->master); - u32 config, iomode, control; - int ret, n_words; + int ret; if (spi->mode & SPI_LOOP && xfer->len > controller->in_fifo_sz) { dev_err(controller->dev, "too big size for loopback %d > %d\n", @@ -565,32 +564,56 @@ static int spi_qup_io_config(struct spi_device *spi, struct spi_transfer *xfer) return -EIO; } - if (spi_qup_set_state(controller, QUP_STATE_RESET)) { - dev_err(controller->dev, "cannot set RESET state\n"); - return -EIO; - } - controller->w_size = DIV_ROUND_UP(xfer->bits_per_word, 8); controller->n_words = xfer->len / controller->w_size; - n_words = controller->n_words; - - if (n_words <= (controller->in_fifo_sz / sizeof(u32))) { + if (controller->n_words <= (controller->in_fifo_sz / sizeof(u32))) controller->mode = QUP_IO_M_MODE_FIFO; + else if (spi->master->can_dma && + spi->master->can_dma(spi->master, spi, xfer) && + spi->master->cur_msg_mapped) + controller->mode = QUP_IO_M_MODE_BAM; + else + controller->mode = QUP_IO_M_MODE_BLOCK; + + return 0; +} + +/* prep qup for another spi transaction of specific type */ +static int spi_qup_io_config(struct spi_device *spi, struct spi_transfer *xfer) +{ + struct spi_qup *controller = spi_master_get_devdata(spi->master); + u32 config, iomode, control; + unsigned long flags; + + spin_lock_irqsave(&controller->lock, flags); + controller->xfer = xfer; + controller->error = 0; + controller->rx_bytes = 0; + controller->tx_bytes = 0; + spin_unlock_irqrestore(&controller->lock, flags); + + + if (spi_qup_set_state(controller, QUP_STATE_RESET)) { + dev_err(controller->dev, "cannot set RESET state\n"); + return -EIO; + } - writel_relaxed(n_words, controller->base + QUP_MX_READ_CNT); - writel_relaxed(n_words, controller->base + QUP_MX_WRITE_CNT); + switch (controller->mode) { + case QUP_IO_M_MODE_FIFO: + writel_relaxed(controller->n_words, + controller->base + QUP_MX_READ_CNT); + writel_relaxed(controller->n_words, + controller->base + QUP_MX_WRITE_CNT); /* must be zero for FIFO */ writel_relaxed(0, controller->base + QUP_MX_INPUT_CNT); writel_relaxed(0, controller->base + QUP_MX_OUTPUT_CNT); - } else if (spi->master->can_dma && - spi->master->can_dma(spi->master, spi, xfer) && - spi->master->cur_msg_mapped) { - - controller->mode = QUP_IO_M_MODE_BAM; - - writel_relaxed(n_words, controller->base + QUP_MX_INPUT_CNT); - writel_relaxed(n_words, controller->base + QUP_MX_OUTPUT_CNT); + break; + case QUP_IO_M_MODE_BAM: + writel_relaxed(controller->n_words, + controller->base + QUP_MX_INPUT_CNT); + writel_relaxed(controller->n_words, + controller->base + QUP_MX_OUTPUT_CNT); /* must be zero for BLOCK and BAM */ writel_relaxed(0, controller->base + QUP_MX_READ_CNT); writel_relaxed(0, controller->base + QUP_MX_WRITE_CNT); @@ -608,19 +631,25 @@ static int spi_qup_io_config(struct spi_device *spi, struct spi_transfer *xfer) if (xfer->tx_buf) writel_relaxed(0, input_cnt); else - writel_relaxed(n_words, input_cnt); + writel_relaxed(controller->n_words, input_cnt); writel_relaxed(0, controller->base + QUP_MX_OUTPUT_CNT); } - } else { - - controller->mode = QUP_IO_M_MODE_BLOCK; - - writel_relaxed(n_words, controller->base + QUP_MX_INPUT_CNT); - writel_relaxed(n_words, controller->base + QUP_MX_OUTPUT_CNT); + break; + case QUP_IO_M_MODE_BLOCK: + reinit_completion(&controller->done); + writel_relaxed(controller->n_words, + controller->base + QUP_MX_INPUT_CNT); + writel_relaxed(controller->n_words, + controller->base + QUP_MX_OUTPUT_CNT); /* must be zero for BLOCK and BAM */ writel_relaxed(0, controller->base + QUP_MX_READ_CNT); writel_relaxed(0, controller->base + QUP_MX_WRITE_CNT); + break; + default: + dev_err(controller->dev, "unknown mode = %d\n", + controller->mode); + return -EIO; } iomode = readl_relaxed(controller->base + QUP_IO_M_MODES); @@ -709,6 +738,10 @@ static int spi_qup_transfer_one(struct spi_master *master, unsigned long timeout, flags; int ret = -EIO; + ret = spi_qup_io_prep(spi, xfer); + if (ret) + return ret; + ret = spi_qup_io_config(spi, xfer); if (ret) return ret; -- QUALCOMM INDIA, on behalf of Qualcomm Innovation Center, Inc. is a member of Code Aurora Forum, hosted by The Linux Foundation