Linux-libre 4.4-gnupck-4.4-gnu

1 files changed, 93 insertions, 46 deletions

diff --git a/drivers/spi/spi-mt65xx.c b/drivers/spi/spi-mt65xx.c
index ecb6c5823..784006706 100644
--- a/drivers/spi/spi-mt65xx.c
+++ b/drivers/spi/spi-mt65xx.c
@@ -20,6 +20,7 @@
 #include <linux/ioport.h>
 #include <linux/module.h>
 #include <linux/of.h>
+#include <linux/of_gpio.h>
 #include <linux/platform_device.h>
 #include <linux/platform_data/spi-mt65xx.h>
 #include <linux/pm_runtime.h>
@@ -84,7 +85,8 @@ struct mtk_spi_compatible {
 struct mtk_spi {
 	void __iomem *base;
 	u32 state;
-	u32 pad_sel;
+	int pad_num;
+	u32 *pad_sel;
 	struct clk *parent_clk, *sel_clk, *spi_clk;
 	struct spi_transfer *cur_transfer;
 	u32 xfer_len;
@@ -131,10 +133,28 @@ static void mtk_spi_reset(struct mtk_spi *mdata)
 	writel(reg_val, mdata->base + SPI_CMD_REG);
 }
 
-static void mtk_spi_config(struct mtk_spi *mdata,
-			   struct mtk_chip_config *chip_config)
+static int mtk_spi_prepare_message(struct spi_master *master,
+				   struct spi_message *msg)
 {
+	u16 cpha, cpol;
 	u32 reg_val;
+	struct spi_device *spi = msg->spi;
+	struct mtk_chip_config *chip_config = spi->controller_data;
+	struct mtk_spi *mdata = spi_master_get_devdata(master);
+
+	cpha = spi->mode & SPI_CPHA ? 1 : 0;
+	cpol = spi->mode & SPI_CPOL ? 1 : 0;
+
+	reg_val = readl(mdata->base + SPI_CMD_REG);
+	if (cpha)
+		reg_val |= SPI_CMD_CPHA;
+	else
+		reg_val &= ~SPI_CMD_CPHA;
+	if (cpol)
+		reg_val |= SPI_CMD_CPOL;
+	else
+		reg_val &= ~SPI_CMD_CPOL;
+	writel(reg_val, mdata->base + SPI_CMD_REG);
 
 	reg_val = readl(mdata->base + SPI_CMD_REG);
 
@@ -170,38 +190,8 @@ static void mtk_spi_config(struct mtk_spi *mdata,
 
 	/* pad select */
 	if (mdata->dev_comp->need_pad_sel)
-		writel(mdata->pad_sel, mdata->base + SPI_PAD_SEL_REG);
-}
-
-static int mtk_spi_prepare_message(struct spi_master *master,
-				   struct spi_message *msg)
-{
-	u32 reg_val;
-	u8 cpha, cpol;
-	struct mtk_chip_config *chip_config;
-	struct spi_device *spi = msg->spi;
-	struct mtk_spi *mdata = spi_master_get_devdata(master);
-
-	cpha = spi->mode & SPI_CPHA ? 1 : 0;
-	cpol = spi->mode & SPI_CPOL ? 1 : 0;
-
-	reg_val = readl(mdata->base + SPI_CMD_REG);
-	if (cpha)
-		reg_val |= SPI_CMD_CPHA;
-	else
-		reg_val &= ~SPI_CMD_CPHA;
-	if (cpol)
-		reg_val |= SPI_CMD_CPOL;
-	else
-		reg_val &= ~SPI_CMD_CPOL;
-	writel(reg_val, mdata->base + SPI_CMD_REG);
-
-	chip_config = spi->controller_data;
-	if (!chip_config) {
-		chip_config = (void *)&mtk_default_chip_info;
-		spi->controller_data = chip_config;
-	}
-	mtk_spi_config(mdata, chip_config);
+		writel(mdata->pad_sel[spi->chip_select],
+		       mdata->base + SPI_PAD_SEL_REG);
 
 	return 0;
 }
@@ -413,6 +403,19 @@ static bool mtk_spi_can_dma(struct spi_master *master,
 	return xfer->len > MTK_SPI_MAX_FIFO_SIZE;
 }
 
+static int mtk_spi_setup(struct spi_device *spi)
+{
+	struct mtk_spi *mdata = spi_master_get_devdata(spi->master);
+
+	if (!spi->controller_data)
+		spi->controller_data = (void *)&mtk_default_chip_info;
+
+	if (mdata->dev_comp->need_pad_sel && gpio_is_valid(spi->cs_gpio))
+		gpio_direction_output(spi->cs_gpio, !(spi->mode & SPI_CS_HIGH));
+
+	return 0;
+}
+
 static irqreturn_t mtk_spi_interrupt(int irq, void *dev_id)
 {
 	u32 cmd, reg_val, cnt;
@@ -484,7 +487,7 @@ static int mtk_spi_probe(struct platform_device *pdev)
 	struct mtk_spi *mdata;
 	const struct of_device_id *of_id;
 	struct resource *res;
-	int irq, ret;
+	int i, irq, ret;
 
 	master = spi_alloc_master(&pdev->dev, sizeof(*mdata));
 	if (!master) {
@@ -500,6 +503,7 @@ static int mtk_spi_probe(struct platform_device *pdev)
 	master->prepare_message = mtk_spi_prepare_message;
 	master->transfer_one = mtk_spi_transfer_one;
 	master->can_dma = mtk_spi_can_dma;
+	master->setup = mtk_spi_setup;
 
 	of_id = of_match_node(mtk_spi_of_match, pdev->dev.of_node);
 	if (!of_id) {
@@ -514,21 +518,34 @@ static int mtk_spi_probe(struct platform_device *pdev)
 		master->flags = SPI_MASTER_MUST_TX;
 
 	if (mdata->dev_comp->need_pad_sel) {
-		ret = of_property_read_u32(pdev->dev.of_node,
-					   "mediatek,pad-select",
-					   &mdata->pad_sel);
-		if (ret) {
-			dev_err(&pdev->dev, "failed to read pad select: %d\n",
-				ret);
+		mdata->pad_num = of_property_count_u32_elems(
+			pdev->dev.of_node,
+			"mediatek,pad-select");
+		if (mdata->pad_num < 0) {
+			dev_err(&pdev->dev,
+				"No 'mediatek,pad-select' property\n");
+			ret = -EINVAL;
 			goto err_put_master;
 		}
 
-		if (mdata->pad_sel > MT8173_SPI_MAX_PAD_SEL) {
-			dev_err(&pdev->dev, "wrong pad-select: %u\n",
-				mdata->pad_sel);
-			ret = -EINVAL;
+		mdata->pad_sel = devm_kmalloc_array(&pdev->dev, mdata->pad_num,
+						    sizeof(u32), GFP_KERNEL);
+		if (!mdata->pad_sel) {
+			ret = -ENOMEM;
 			goto err_put_master;
 		}
+
+		for (i = 0; i < mdata->pad_num; i++) {
+			of_property_read_u32_index(pdev->dev.of_node,
+						   "mediatek,pad-select",
+						   i, &mdata->pad_sel[i]);
+			if (mdata->pad_sel[i] > MT8173_SPI_MAX_PAD_SEL) {
+				dev_err(&pdev->dev, "wrong pad-sel[%d]: %u\n",
+					i, mdata->pad_sel[i]);
+				ret = -EINVAL;
+				goto err_put_master;
+			}
+		}
 	}
 
 	platform_set_drvdata(pdev, master);
@@ -606,6 +623,36 @@ static int mtk_spi_probe(struct platform_device *pdev)
 		goto err_put_master;
 	}
 
+	if (mdata->dev_comp->need_pad_sel) {
+		if (mdata->pad_num != master->num_chipselect) {
+			dev_err(&pdev->dev,
+				"pad_num does not match num_chipselect(%d != %d)\n",
+				mdata->pad_num, master->num_chipselect);
+			ret = -EINVAL;
+			goto err_put_master;
+		}
+
+		if (!master->cs_gpios && master->num_chipselect > 1) {
+			dev_err(&pdev->dev,
+				"cs_gpios not specified and num_chipselect > 1\n");
+			ret = -EINVAL;
+			goto err_put_master;
+		}
+
+		if (master->cs_gpios) {
+			for (i = 0; i < master->num_chipselect; i++) {
+				ret = devm_gpio_request(&pdev->dev,
+							master->cs_gpios[i],
+							dev_name(&pdev->dev));
+				if (ret) {
+					dev_err(&pdev->dev,
+						"can't get CS GPIO %i\n", i);
+					goto err_put_master;
+				}
+			}
+		}
+	}
+
 	return 0;
 
 err_disable_clk: