linux-kernel - [PATCH linux-next v4 1/4] spi: imx: introduce fifo_size and has_dmamode in spi_imx_devtype

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Message-ID: <20170608051603.16070-2-jiada_wang@mentor.com>
Date:   Thu, 8 Jun 2017 14:16:00 +0900
From:   Jiada Wang <jiada_wang@...tor.com>
To:     <broonie@...nel.org>, <robh+dt@...nel.org>, <mark.rutland@....com>,
        <shawnguo@...nel.org>, <kernel@...gutronix.de>,
        <fabio.estevam@....com>
CC:     <linux-spi@...r.kernel.org>, <devicetree@...r.kernel.org>,
        <linux-kernel@...r.kernel.org>,
        <linux-arm-kernel@...ts.infradead.org>
Subject: [PATCH linux-next v4 1/4] spi: imx: introduce fifo_size and has_dmamode in spi_imx_devtype_data

Different ECSPI controller has different fifosize and DMA capability,
instead of calling functions to identify these information by check
devtype. add fifo_size and has_dmamode to spi_imx_devtype_data.
so that these information can be directly accessed.

Signed-off-by: Jiada Wang <jiada_wang@...tor.com>
---
 drivers/spi/spi-imx.c | 27 ++++++++++++++++++---------
 1 file changed, 18 insertions(+), 9 deletions(-)

diff --git a/drivers/spi/spi-imx.c b/drivers/spi/spi-imx.c
index e544f45..4469121 100644
--- a/drivers/spi/spi-imx.c
+++ b/drivers/spi/spi-imx.c
@@ -74,6 +74,8 @@ struct spi_imx_devtype_data {
 	void (*trigger)(struct spi_imx_data *);
 	int (*rx_available)(struct spi_imx_data *);
 	void (*reset)(struct spi_imx_data *);
+	bool has_dmamode;
+	unsigned int fifo_size;
 	enum spi_imx_devtype devtype;
 };
 
@@ -125,11 +127,6 @@ static inline int is_imx51_ecspi(struct spi_imx_data *d)
 	return d->devtype_data->devtype == IMX51_ECSPI;
 }
 
-static inline unsigned spi_imx_get_fifosize(struct spi_imx_data *d)
-{
-	return is_imx51_ecspi(d) ? 64 : 8;
-}
-
 #define MXC_SPI_BUF_RX(type)						\
 static void spi_imx_buf_rx_##type(struct spi_imx_data *spi_imx)		\
 {									\
@@ -219,7 +216,7 @@ static bool spi_imx_can_dma(struct spi_master *master, struct spi_device *spi,
 	if (bytes_per_word != 1 && bytes_per_word != 2 && bytes_per_word != 4)
 		return false;
 
-	for (i = spi_imx_get_fifosize(spi_imx) / 2; i > 0; i--) {
+	for (i = spi_imx->devtype_data->fifo_size / 2; i > 0; i--) {
 		if (!(transfer->len % (i * bytes_per_word)))
 			break;
 	}
@@ -693,6 +690,8 @@ static struct spi_imx_devtype_data imx1_cspi_devtype_data = {
 	.trigger = mx1_trigger,
 	.rx_available = mx1_rx_available,
 	.reset = mx1_reset,
+	.fifo_size = 8,
+	.has_dmamode = false,
 	.devtype = IMX1_CSPI,
 };
 
@@ -702,6 +701,8 @@ static struct spi_imx_devtype_data imx21_cspi_devtype_data = {
 	.trigger = mx21_trigger,
 	.rx_available = mx21_rx_available,
 	.reset = mx21_reset,
+	.fifo_size = 8,
+	.has_dmamode = false,
 	.devtype = IMX21_CSPI,
 };
 
@@ -712,6 +713,8 @@ static struct spi_imx_devtype_data imx27_cspi_devtype_data = {
 	.trigger = mx21_trigger,
 	.rx_available = mx21_rx_available,
 	.reset = mx21_reset,
+	.fifo_size = 8,
+	.has_dmamode = false,
 	.devtype = IMX27_CSPI,
 };
 
@@ -721,6 +724,8 @@ static struct spi_imx_devtype_data imx31_cspi_devtype_data = {
 	.trigger = mx31_trigger,
 	.rx_available = mx31_rx_available,
 	.reset = mx31_reset,
+	.fifo_size = 8,
+	.has_dmamode = false,
 	.devtype = IMX31_CSPI,
 };
 
@@ -731,6 +736,8 @@ static struct spi_imx_devtype_data imx35_cspi_devtype_data = {
 	.trigger = mx31_trigger,
 	.rx_available = mx31_rx_available,
 	.reset = mx31_reset,
+	.fifo_size = 8,
+	.has_dmamode = true,
 	.devtype = IMX35_CSPI,
 };
 
@@ -740,6 +747,8 @@ static struct spi_imx_devtype_data imx51_ecspi_devtype_data = {
 	.trigger = mx51_ecspi_trigger,
 	.rx_available = mx51_ecspi_rx_available,
 	.reset = mx51_ecspi_reset,
+	.fifo_size = 64,
+	.has_dmamode = true,
 	.devtype = IMX51_ECSPI,
 };
 
@@ -791,7 +800,7 @@ static void spi_imx_chipselect(struct spi_device *spi, int is_active)
 
 static void spi_imx_push(struct spi_imx_data *spi_imx)
 {
-	while (spi_imx->txfifo < spi_imx_get_fifosize(spi_imx)) {
+	while (spi_imx->txfifo < spi_imx->devtype_data->fifo_size) {
 		if (!spi_imx->count)
 			break;
 		spi_imx->tx(spi_imx);
@@ -938,7 +947,7 @@ static int spi_imx_sdma_init(struct device *dev, struct spi_imx_data *spi_imx,
 	if (of_machine_is_compatible("fsl,imx6dl"))
 		return 0;
 
-	spi_imx->wml = spi_imx_get_fifosize(spi_imx) / 2;
+	spi_imx->wml = spi_imx->devtype_data->fifo_size / 2;
 
 	/* Prepare for TX DMA: */
 	master->dma_tx = dma_request_slave_channel_reason(dev, "tx");
@@ -1262,7 +1271,7 @@ static int spi_imx_probe(struct platform_device *pdev)
 	 * Only validated on i.mx35 and i.mx6 now, can remove the constraint
 	 * if validated on other chips.
 	 */
-	if (is_imx35_cspi(spi_imx) || is_imx51_ecspi(spi_imx)) {
+	if (spi_imx->devtype_data->has_dmamode) {
 		ret = spi_imx_sdma_init(&pdev->dev, spi_imx, master);
 		if (ret == -EPROBE_DEFER)
 			goto out_clk_put;
-- 
2.9.3