path: root/target/linux/ipq806x/patches-4.9/0013-spi-qup-call-io_config-in-mode-specific-function.patch

From 9263d98e255e1d51b41c752d53e39877728a9419 Mon Sep 17 00:00:00 2001
From: Matthew McClintock <mmcclint@codeaurora.org>
Date: Tue, 26 Apr 2016 13:14:45 -0500
Subject: [PATCH 13/37] spi: qup: call io_config in mode specific function

DMA transactions should only only need to call io_config only once, but
block mode might call it several times to setup several transactions so
it can handle reads/writes larger than the max size per transaction, so
we move the call to the do_ functions.

This is just refactoring, there should be no functional change

Signed-off-by: Matthew McClintock <mmcclint@codeaurora.org>
---
 drivers/spi/spi-qup.c |  327 +++++++++++++++++++++++++------------------------
 1 file changed, 166 insertions(+), 161 deletions(-)

--- a/drivers/spi/spi-qup.c
+++ b/drivers/spi/spi-qup.c
@@ -418,13 +418,170 @@ static void spi_qup_dma_terminate(struct
 		dmaengine_terminate_all(master->dma_rx);
 }
 
-static int spi_qup_do_dma(struct spi_master *master, struct spi_transfer *xfer,
+/* 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;
+
+	reinit_completion(&controller->done);
+	reinit_completion(&controller->dma_tx_done);
+
+	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;
+	}
+
+	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);
+			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);
+			if (!controller->qup_v1) {
+				void __iomem *input_cnt;
+
+				input_cnt = controller->base + QUP_MX_INPUT_CNT;
+				/*
+				 * for DMA transfers, both QUP_MX_INPUT_CNT and
+				 * QUP_MX_OUTPUT_CNT must be zero to all cases
+				 * but one. That case is a non-balanced
+				 * transfer when there is only a rx_buf.
+				 */
+				if (xfer->tx_buf)
+					writel_relaxed(0, input_cnt);
+				else
+					writel_relaxed(controller->n_words,
+						       input_cnt);
+
+				writel_relaxed(0, controller->base + QUP_MX_OUTPUT_CNT);
+			}
+			break;
+		case QUP_IO_M_MODE_BLOCK:
+			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);
+	/* Set input and output transfer mode */
+	iomode &= ~(QUP_IO_M_INPUT_MODE_MASK | QUP_IO_M_OUTPUT_MODE_MASK);
+
+	if (!spi_qup_is_dma_xfer(controller->mode))
+		iomode &= ~(QUP_IO_M_PACK_EN | QUP_IO_M_UNPACK_EN);
+	else
+		iomode |= QUP_IO_M_PACK_EN | QUP_IO_M_UNPACK_EN;
+
+	iomode |= (controller->mode << QUP_IO_M_OUTPUT_MODE_MASK_SHIFT);
+	iomode |= (controller->mode << QUP_IO_M_INPUT_MODE_MASK_SHIFT);
+
+	writel_relaxed(iomode, controller->base + QUP_IO_M_MODES);
+
+	control = readl_relaxed(controller->base + SPI_IO_CONTROL);
+
+	if (spi->mode & SPI_CPOL)
+		control |= SPI_IO_C_CLK_IDLE_HIGH;
+	else
+		control &= ~SPI_IO_C_CLK_IDLE_HIGH;
+
+	writel_relaxed(control, controller->base + SPI_IO_CONTROL);
+
+	config = readl_relaxed(controller->base + SPI_CONFIG);
+
+	if (spi->mode & SPI_LOOP)
+		config |= SPI_CONFIG_LOOPBACK;
+	else
+		config &= ~SPI_CONFIG_LOOPBACK;
+
+	if (spi->mode & SPI_CPHA)
+		config &= ~SPI_CONFIG_INPUT_FIRST;
+	else
+		config |= SPI_CONFIG_INPUT_FIRST;
+
+	/*
+	 * HS_MODE improves signal stability for spi-clk high rates,
+	 * but is invalid in loop back mode.
+	 */
+	if ((xfer->speed_hz >= SPI_HS_MIN_RATE) && !(spi->mode & SPI_LOOP))
+		config |= SPI_CONFIG_HS_MODE;
+	else
+		config &= ~SPI_CONFIG_HS_MODE;
+
+	writel_relaxed(config, controller->base + SPI_CONFIG);
+
+	config = readl_relaxed(controller->base + QUP_CONFIG);
+	config &= ~(QUP_CONFIG_NO_INPUT | QUP_CONFIG_NO_OUTPUT | QUP_CONFIG_N);
+	config |= xfer->bits_per_word - 1;
+	config |= QUP_CONFIG_SPI_MODE;
+
+	if (spi_qup_is_dma_xfer(controller->mode)) {
+		if (!xfer->tx_buf)
+			config |= QUP_CONFIG_NO_OUTPUT;
+		if (!xfer->rx_buf)
+			config |= QUP_CONFIG_NO_INPUT;
+	}
+
+	writel_relaxed(config, controller->base + QUP_CONFIG);
+
+	/* only write to OPERATIONAL_MASK when register is present */
+	if (!controller->qup_v1) {
+		u32 mask = 0;
+
+		/*
+		 * mask INPUT and OUTPUT service flags to prevent IRQs on FIFO
+		 * status change in BAM mode
+		 */
+
+		if (spi_qup_is_dma_xfer(controller->mode))
+			mask = QUP_OP_IN_SERVICE_FLAG | QUP_OP_OUT_SERVICE_FLAG;
+
+		writel_relaxed(mask, controller->base + QUP_OPERATIONAL_MASK);
+	}
+
+	return 0;
+}
+
+static int spi_qup_do_dma(struct spi_device *spi, struct spi_transfer *xfer,
 unsigned long timeout)
 {
+	struct spi_master *master = spi->master;
 	struct spi_qup *qup = spi_master_get_devdata(master);
 	dma_async_tx_callback rx_done = NULL, tx_done = NULL;
 	int ret;
 
+	ret = spi_qup_io_config(spi, xfer);
+	if (ret)
+		return ret;
+
 	/* before issuing the descriptors, set the QUP to run */
 	ret = spi_qup_set_state(qup, QUP_STATE_RUN);
 	if (ret) {
@@ -467,12 +624,17 @@ unsigned long timeout)
 	return ret;
 }
 
-static int spi_qup_do_pio(struct spi_master *master, struct spi_transfer *xfer,
+static int spi_qup_do_pio(struct spi_device *spi, struct spi_transfer *xfer,
 			  unsigned long timeout)
 {
+	struct spi_master *master = spi->master;
 	struct spi_qup *qup = spi_master_get_devdata(master);
 	int ret;
 
+	ret = spi_qup_io_config(spi, xfer);
+	if (ret)
+		return ret;
+
 	ret = spi_qup_set_state(qup, QUP_STATE_RUN);
 	if (ret) {
 		dev_warn(qup->dev, "cannot set RUN state\n");
@@ -619,159 +781,6 @@ static int spi_qup_io_prep(struct spi_de
 	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;
-
-	reinit_completion(&controller->done);
-	reinit_completion(&controller->dma_tx_done);
-
-	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;
-	}
-
-	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);
-			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);
-			if (!controller->qup_v1) {
-				void __iomem *input_cnt;
-
-				input_cnt = controller->base + QUP_MX_INPUT_CNT;
-				/*
-				 * for DMA transfers, both QUP_MX_INPUT_CNT and
-				 * QUP_MX_OUTPUT_CNT must be zero to all cases
-				 * but one. That case is a non-balanced
-				 * transfer when there is only a rx_buf.
-				 */
-				if (xfer->tx_buf)
-					writel_relaxed(0, input_cnt);
-				else
-					writel_relaxed(controller->n_words,
-						       input_cnt);
-
-				writel_relaxed(0, controller->base + QUP_MX_OUTPUT_CNT);
-			}
-			break;
-		case QUP_IO_M_MODE_BLOCK:
-			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);
-	/* Set input and output transfer mode */
-	iomode &= ~(QUP_IO_M_INPUT_MODE_MASK | QUP_IO_M_OUTPUT_MODE_MASK);
-
-	if (!spi_qup_is_dma_xfer(controller->mode))
-		iomode &= ~(QUP_IO_M_PACK_EN | QUP_IO_M_UNPACK_EN);
-	else
-		iomode |= QUP_IO_M_PACK_EN | QUP_IO_M_UNPACK_EN;
-
-	iomode |= (controller->mode << QUP_IO_M_OUTPUT_MODE_MASK_SHIFT);
-	iomode |= (controller->mode << QUP_IO_M_INPUT_MODE_MASK_SHIFT);
-
-	writel_relaxed(iomode, controller->base + QUP_IO_M_MODES);
-
-	control = readl_relaxed(controller->base + SPI_IO_CONTROL);
-
-	if (spi->mode & SPI_CPOL)
-		control |= SPI_IO_C_CLK_IDLE_HIGH;
-	else
-		control &= ~SPI_IO_C_CLK_IDLE_HIGH;
-
-	writel_relaxed(control, controller->base + SPI_IO_CONTROL);
-
-	config = readl_relaxed(controller->base + SPI_CONFIG);
-
-	if (spi->mode & SPI_LOOP)
-		config |= SPI_CONFIG_LOOPBACK;
-	else
-		config &= ~SPI_CONFIG_LOOPBACK;
-
-	if (spi->mode & SPI_CPHA)
-		config &= ~SPI_CONFIG_INPUT_FIRST;
-	else
-		config |= SPI_CONFIG_INPUT_FIRST;
-
-	/*
-	 * HS_MODE improves signal stability for spi-clk high rates,
-	 * but is invalid in loop back mode.
-	 */
-	if ((xfer->speed_hz >= SPI_HS_MIN_RATE) && !(spi->mode & SPI_LOOP))
-		config |= SPI_CONFIG_HS_MODE;
-	else
-		config &= ~SPI_CONFIG_HS_MODE;
-
-	writel_relaxed(config, controller->base + SPI_CONFIG);
-
-	config = readl_relaxed(controller->base + QUP_CONFIG);
-	config &= ~(QUP_CONFIG_NO_INPUT | QUP_CONFIG_NO_OUTPUT | QUP_CONFIG_N);
-	config |= xfer->bits_per_word - 1;
-	config |= QUP_CONFIG_SPI_MODE;
-
-	if (spi_qup_is_dma_xfer(controller->mode)) {
-		if (!xfer->tx_buf)
-			config |= QUP_CONFIG_NO_OUTPUT;
-		if (!xfer->rx_buf)
-			config |= QUP_CONFIG_NO_INPUT;
-	}
-
-	writel_relaxed(config, controller->base + QUP_CONFIG);
-
-	/* only write to OPERATIONAL_MASK when register is present */
-	if (!controller->qup_v1) {
-		u32 mask = 0;
-
-		/*
-		 * mask INPUT and OUTPUT service flags to prevent IRQs on FIFO
-		 * status change in BAM mode
-		 */
-
-		if (spi_qup_is_dma_xfer(controller->mode))
-			mask = QUP_OP_IN_SERVICE_FLAG | QUP_OP_OUT_SERVICE_FLAG;
-
-		writel_relaxed(mask, controller->base + QUP_OPERATIONAL_MASK);
-	}
-
-	return 0;
-}
-
 static int spi_qup_transfer_one(struct spi_master *master,
 			      struct spi_device *spi,
 			      struct spi_transfer *xfer)
@@ -784,18 +793,14 @@ static int spi_qup_transfer_one(struct s
 	if (ret)
 		return ret;
 
-	ret = spi_qup_io_config(spi, xfer);
-	if (ret)
-		return ret;
-
 	timeout = DIV_ROUND_UP(xfer->speed_hz, MSEC_PER_SEC);
 	timeout = DIV_ROUND_UP(xfer->len * 8, timeout);
 	timeout = 100 * msecs_to_jiffies(timeout);
 
 	if (spi_qup_is_dma_xfer(controller->mode))
-		ret = spi_qup_do_dma(master, xfer, timeout);
+		ret = spi_qup_do_dma(spi, xfer, timeout);
 	else
-		ret = spi_qup_do_pio(master, xfer, timeout);
+		ret = spi_qup_do_pio(spi, xfer, timeout);
 
 	if (ret)
 		goto exit;