1 files changed, 120 insertions, 68 deletions

diff --git a/drivers/spi/spi-mt65xx.c b/drivers/spi/spi-mt65xx.c
index 976f73b9e299..386e8c84be0a 100644
--- a/drivers/spi/spi-mt65xx.c
+++ b/drivers/spi/spi-mt65xx.c
@@ -42,8 +42,9 @@
 #define SPI_CFG1_CS_IDLE_OFFSET           0
 #define SPI_CFG1_PACKET_LOOP_OFFSET       8
 #define SPI_CFG1_PACKET_LENGTH_OFFSET     16
-#define SPI_CFG1_GET_TICK_DLY_OFFSET      30
+#define SPI_CFG1_GET_TICK_DLY_OFFSET      29
 
+#define SPI_CFG1_GET_TICK_DLY_MASK        0xe0000000
 #define SPI_CFG1_CS_IDLE_MASK             0xff
 #define SPI_CFG1_PACKET_LOOP_MASK         0xff00
 #define SPI_CFG1_PACKET_LENGTH_MASK       0x3ff0000
@@ -90,6 +91,8 @@ struct mtk_spi_compatible {
 	bool enhance_timing;
 	/* some IC support DMA addr extension */
 	bool dma_ext;
+	/* some IC no need unprepare SPI clk */
+	bool no_need_unprepare;
 };
 
 struct mtk_spi {
@@ -104,6 +107,7 @@ struct mtk_spi {
 	struct scatterlist *tx_sgl, *rx_sgl;
 	u32 tx_sgl_len, rx_sgl_len;
 	const struct mtk_spi_compatible *dev_comp;
+	u32 spi_clk_hz;
 };
 
 static const struct mtk_spi_compatible mtk_common_compat;
@@ -135,12 +139,21 @@ static const struct mtk_spi_compatible mt8183_compat = {
 	.enhance_timing = true,
 };
 
+static const struct mtk_spi_compatible mt6893_compat = {
+	.need_pad_sel = true,
+	.must_tx = true,
+	.enhance_timing = true,
+	.dma_ext = true,
+	.no_need_unprepare = true,
+};
+
 /*
  * A piece of default chip info unless the platform
  * supplies it.
  */
 static const struct mtk_chip_config mtk_default_chip_info = {
 	.sample_sel = 0,
+	.tick_delay = 0,
 };
 
 static const struct of_device_id mtk_spi_of_match[] = {
@@ -174,6 +187,9 @@ static const struct of_device_id mtk_spi_of_match[] = {
 	{ .compatible = "mediatek,mt8192-spi",
 		.data = (void *)&mt6765_compat,
 	},
+	{ .compatible = "mediatek,mt6893-spi",
+		.data = (void *)&mt6893_compat,
+	},
 	{}
 };
 MODULE_DEVICE_TABLE(of, mtk_spi_of_match);
@@ -192,6 +208,65 @@ static void mtk_spi_reset(struct mtk_spi *mdata)
 	writel(reg_val, mdata->base + SPI_CMD_REG);
 }
 
+static int mtk_spi_set_hw_cs_timing(struct spi_device *spi)
+{
+	struct mtk_spi *mdata = spi_master_get_devdata(spi->master);
+	struct spi_delay *cs_setup = &spi->cs_setup;
+	struct spi_delay *cs_hold = &spi->cs_hold;
+	struct spi_delay *cs_inactive = &spi->cs_inactive;
+	u32 setup, hold, inactive;
+	u32 reg_val;
+	int delay;
+
+	delay = spi_delay_to_ns(cs_setup, NULL);
+	if (delay < 0)
+		return delay;
+	setup = (delay * DIV_ROUND_UP(mdata->spi_clk_hz, 1000000)) / 1000;
+
+	delay = spi_delay_to_ns(cs_hold, NULL);
+	if (delay < 0)
+		return delay;
+	hold = (delay * DIV_ROUND_UP(mdata->spi_clk_hz, 1000000)) / 1000;
+
+	delay = spi_delay_to_ns(cs_inactive, NULL);
+	if (delay < 0)
+		return delay;
+	inactive = (delay * DIV_ROUND_UP(mdata->spi_clk_hz, 1000000)) / 1000;
+
+	setup    = setup ? setup : 1;
+	hold     = hold ? hold : 1;
+	inactive = inactive ? inactive : 1;
+
+	reg_val = readl(mdata->base + SPI_CFG0_REG);
+	if (mdata->dev_comp->enhance_timing) {
+		hold = min_t(u32, hold, 0x10000);
+		setup = min_t(u32, setup, 0x10000);
+		reg_val &= ~(0xffff << SPI_ADJUST_CFG0_CS_HOLD_OFFSET);
+		reg_val |= (((hold - 1) & 0xffff)
+			   << SPI_ADJUST_CFG0_CS_HOLD_OFFSET);
+		reg_val &= ~(0xffff << SPI_ADJUST_CFG0_CS_SETUP_OFFSET);
+		reg_val |= (((setup - 1) & 0xffff)
+			   << SPI_ADJUST_CFG0_CS_SETUP_OFFSET);
+	} else {
+		hold = min_t(u32, hold, 0x100);
+		setup = min_t(u32, setup, 0x100);
+		reg_val &= ~(0xff << SPI_CFG0_CS_HOLD_OFFSET);
+		reg_val |= (((hold - 1) & 0xff) << SPI_CFG0_CS_HOLD_OFFSET);
+		reg_val &= ~(0xff << SPI_CFG0_CS_SETUP_OFFSET);
+		reg_val |= (((setup - 1) & 0xff)
+			    << SPI_CFG0_CS_SETUP_OFFSET);
+	}
+	writel(reg_val, mdata->base + SPI_CFG0_REG);
+
+	inactive = min_t(u32, inactive, 0x100);
+	reg_val = readl(mdata->base + SPI_CFG1_REG);
+	reg_val &= ~SPI_CFG1_CS_IDLE_MASK;
+	reg_val |= (((inactive - 1) & 0xff) << SPI_CFG1_CS_IDLE_OFFSET);
+	writel(reg_val, mdata->base + SPI_CFG1_REG);
+
+	return 0;
+}
+
 static int mtk_spi_prepare_message(struct spi_master *master,
 				   struct spi_message *msg)
 {
@@ -261,6 +336,15 @@ static int mtk_spi_prepare_message(struct spi_master *master,
 		writel(mdata->pad_sel[spi->chip_select],
 		       mdata->base + SPI_PAD_SEL_REG);
 
+	/* tick delay */
+	reg_val = readl(mdata->base + SPI_CFG1_REG);
+	reg_val &= ~SPI_CFG1_GET_TICK_DLY_MASK;
+	reg_val |= ((chip_config->tick_delay & 0x7)
+		<< SPI_CFG1_GET_TICK_DLY_OFFSET);
+	writel(reg_val, mdata->base + SPI_CFG1_REG);
+
+	/* set hw cs timing */
+	mtk_spi_set_hw_cs_timing(spi);
 	return 0;
 }
 
@@ -287,12 +371,11 @@ static void mtk_spi_set_cs(struct spi_device *spi, bool enable)
 static void mtk_spi_prepare_transfer(struct spi_master *master,
 				     struct spi_transfer *xfer)
 {
-	u32 spi_clk_hz, div, sck_time, reg_val;
+	u32 div, sck_time, reg_val;
 	struct mtk_spi *mdata = spi_master_get_devdata(master);
 
-	spi_clk_hz = clk_get_rate(mdata->spi_clk);
-	if (xfer->speed_hz < spi_clk_hz / 2)
-		div = DIV_ROUND_UP(spi_clk_hz, xfer->speed_hz);
+	if (xfer->speed_hz < mdata->spi_clk_hz / 2)
+		div = DIV_ROUND_UP(mdata->spi_clk_hz, xfer->speed_hz);
 	else
 		div = 1;
 
@@ -426,14 +509,15 @@ static int mtk_spi_fifo_transfer(struct spi_master *master,
 	mtk_spi_prepare_transfer(master, xfer);
 	mtk_spi_setup_packet(master);
 
-	cnt = xfer->len / 4;
-	iowrite32_rep(mdata->base + SPI_TX_DATA_REG, xfer->tx_buf, cnt);
-
-	remainder = xfer->len % 4;
-	if (remainder > 0) {
-		reg_val = 0;
-		memcpy(&reg_val, xfer->tx_buf + (cnt * 4), remainder);
-		writel(reg_val, mdata->base + SPI_TX_DATA_REG);
+	if (xfer->tx_buf) {
+		cnt = xfer->len / 4;
+		iowrite32_rep(mdata->base + SPI_TX_DATA_REG, xfer->tx_buf, cnt);
+		remainder = xfer->len % 4;
+		if (remainder > 0) {
+			reg_val = 0;
+			memcpy(&reg_val, xfer->tx_buf + (cnt * 4), remainder);
+			writel(reg_val, mdata->base + SPI_TX_DATA_REG);
+		}
 	}
 
 	mtk_spi_enable_transfer(master);
@@ -506,52 +590,6 @@ static bool mtk_spi_can_dma(struct spi_master *master,
 		(unsigned long)xfer->rx_buf % 4 == 0);
 }
 
-static int mtk_spi_set_hw_cs_timing(struct spi_device *spi,
-				    struct spi_delay *setup,
-				    struct spi_delay *hold,
-				    struct spi_delay *inactive)
-{
-	struct mtk_spi *mdata = spi_master_get_devdata(spi->master);
-	u16 setup_dly, hold_dly, inactive_dly;
-	u32 reg_val;
-
-	if ((setup && setup->unit != SPI_DELAY_UNIT_SCK) ||
-	    (hold && hold->unit != SPI_DELAY_UNIT_SCK) ||
-	    (inactive && inactive->unit != SPI_DELAY_UNIT_SCK)) {
-		dev_err(&spi->dev,
-			"Invalid delay unit, should be SPI_DELAY_UNIT_SCK\n");
-		return -EINVAL;
-	}
-
-	setup_dly = setup ? setup->value : 1;
-	hold_dly = hold ? hold->value : 1;
-	inactive_dly = inactive ? inactive->value : 1;
-
-	reg_val = readl(mdata->base + SPI_CFG0_REG);
-	if (mdata->dev_comp->enhance_timing) {
-		reg_val &= ~(0xffff << SPI_ADJUST_CFG0_CS_HOLD_OFFSET);
-		reg_val |= (((hold_dly - 1) & 0xffff)
-			   << SPI_ADJUST_CFG0_CS_HOLD_OFFSET);
-		reg_val &= ~(0xffff << SPI_ADJUST_CFG0_CS_SETUP_OFFSET);
-		reg_val |= (((setup_dly - 1) & 0xffff)
-			   << SPI_ADJUST_CFG0_CS_SETUP_OFFSET);
-	} else {
-		reg_val &= ~(0xff << SPI_CFG0_CS_HOLD_OFFSET);
-		reg_val |= (((hold_dly - 1) & 0xff) << SPI_CFG0_CS_HOLD_OFFSET);
-		reg_val &= ~(0xff << SPI_CFG0_CS_SETUP_OFFSET);
-		reg_val |= (((setup_dly - 1) & 0xff)
-			    << SPI_CFG0_CS_SETUP_OFFSET);
-	}
-	writel(reg_val, mdata->base + SPI_CFG0_REG);
-
-	reg_val = readl(mdata->base + SPI_CFG1_REG);
-	reg_val &= ~SPI_CFG1_CS_IDLE_MASK;
-	reg_val |= (((inactive_dly - 1) & 0xff) << SPI_CFG1_CS_IDLE_OFFSET);
-	writel(reg_val, mdata->base + SPI_CFG1_REG);
-
-	return 0;
-}
-
 static int mtk_spi_setup(struct spi_device *spi)
 {
 	struct mtk_spi *mdata = spi_master_get_devdata(spi->master);
@@ -789,15 +827,14 @@ static int mtk_spi_probe(struct platform_device *pdev)
 		goto err_put_master;
 	}
 
-	clk_disable_unprepare(mdata->spi_clk);
+	mdata->spi_clk_hz = clk_get_rate(mdata->spi_clk);
 
-	pm_runtime_enable(&pdev->dev);
+	if (mdata->dev_comp->no_need_unprepare)
+		clk_disable(mdata->spi_clk);
+	else
+		clk_disable_unprepare(mdata->spi_clk);
 
-	ret = devm_spi_register_master(&pdev->dev, master);
-	if (ret) {
-		dev_err(&pdev->dev, "failed to register master (%d)\n", ret);
-		goto err_disable_runtime_pm;
-	}
+	pm_runtime_enable(&pdev->dev);
 
 	if (mdata->dev_comp->need_pad_sel) {
 		if (mdata->pad_num != master->num_chipselect) {
@@ -838,6 +875,12 @@ static int mtk_spi_probe(struct platform_device *pdev)
 		dev_notice(&pdev->dev, "SPI dma_set_mask(%d) failed, ret:%d\n",
 			   addr_bits, ret);
 
+	ret = devm_spi_register_master(&pdev->dev, master);
+	if (ret) {
+		dev_err(&pdev->dev, "failed to register master (%d)\n", ret);
+		goto err_disable_runtime_pm;
+	}
+
 	return 0;
 
 err_disable_runtime_pm:
@@ -857,6 +900,9 @@ static int mtk_spi_remove(struct platform_device *pdev)
 
 	mtk_spi_reset(mdata);
 
+	if (mdata->dev_comp->no_need_unprepare)
+		clk_unprepare(mdata->spi_clk);
+
 	return 0;
 }
 
@@ -905,7 +951,10 @@ static int mtk_spi_runtime_suspend(struct device *dev)
 	struct spi_master *master = dev_get_drvdata(dev);
 	struct mtk_spi *mdata = spi_master_get_devdata(master);
 
-	clk_disable_unprepare(mdata->spi_clk);
+	if (mdata->dev_comp->no_need_unprepare)
+		clk_disable(mdata->spi_clk);
+	else
+		clk_disable_unprepare(mdata->spi_clk);
 
 	return 0;
 }
@@ -916,7 +965,10 @@ static int mtk_spi_runtime_resume(struct device *dev)
 	struct mtk_spi *mdata = spi_master_get_devdata(master);
 	int ret;
 
-	ret = clk_prepare_enable(mdata->spi_clk);
+	if (mdata->dev_comp->no_need_unprepare)
+		ret = clk_enable(mdata->spi_clk);
+	else
+		ret = clk_prepare_enable(mdata->spi_clk);
 	if (ret < 0) {
 		dev_err(dev, "failed to enable spi_clk (%d)\n", ret);
 		return ret;