Merge series "Support ROCKCHIP SPI new feature" from Jon Lin <jon.lin…

…@rock-chips.com>:

Changes in v10:
- The internal CS inactive function is only supported after VER 0x00110002

Changes in v9:
- Conver to use CS GPIO description

Changes in v8:
- There is a problem with the version 7 mail format. resend it

Changes in v7:
- Fall back "rockchip,rv1126-spi" to "rockchip,rk3066-spi"

Changes in v6:
- Consider to compatibility, the "rockchip,rk3568-spi" is removed in
  Series-changes v5, so the commit massage should also remove the
  corresponding information

Changes in v5:
- Change to leave one compatible id rv1126, and rk3568 is compatible
  with rv1126

Changes in v4:
- Adjust the order patches
- Simply commit massage like redundancy "application" content

Changes in v3:
- Fix compile error which is find by Sascha in [v2,2/8]

Jon Lin (6):
  dt-bindings: spi: spi-rockchip: add description for rv1126
  spi: rockchip: add compatible string for rv1126
  spi: rockchip: Set rx_fifo interrupt waterline base on transfer item
  spi: rockchip: Wait for STB status in slave mode tx_xfer
  spi: rockchip: Support cs-gpio
  spi: rockchip: Support SPI_CS_HIGH

 .../devicetree/bindings/spi/spi-rockchip.yaml |  1 +
 drivers/spi/spi-rockchip.c                    | 55 ++++++++++++++-----
 2 files changed, 41 insertions(+), 15 deletions(-)

--
2.17.1

Documentation/devicetree/bindings/spi/spi-rockchip.yaml

@@ -33,6 +33,7 @@ properties:
               - rockchip,rk3328-spi
               - rockchip,rk3368-spi
               - rockchip,rk3399-spi
+              - rockchip,rv1126-spi
           - const: rockchip,rk3066-spi
 
   reg:

drivers/spi/spi-rockchip.c

@@ -107,6 +107,8 @@
 #define CR0_OPM_MASTER				0x0
 #define CR0_OPM_SLAVE				0x1
 
+#define CR0_SOI_OFFSET				23
+
 #define CR0_MTM_OFFSET				0x21
 
 /* Bit fields in SER, 2bit */
@@ -116,13 +118,14 @@
 #define BAUDR_SCKDV_MIN				2
 #define BAUDR_SCKDV_MAX				65534
 
-/* Bit fields in SR, 5bit */
-#define SR_MASK						0x1f
+/* Bit fields in SR, 6bit */
+#define SR_MASK						0x3f
 #define SR_BUSY						(1 << 0)
 #define SR_TF_FULL					(1 << 1)
 #define SR_TF_EMPTY					(1 << 2)
 #define SR_RF_EMPTY					(1 << 3)
 #define SR_RF_FULL					(1 << 4)
+#define SR_SLAVE_TX_BUSY				(1 << 5)
 
 /* Bit fields in ISR, IMR, ISR, RISR, 5bit */
 #define INT_MASK					0x1f
@@ -156,7 +159,8 @@
  */
 #define ROCKCHIP_SPI_MAX_TRANLEN		0xffff
 
-#define ROCKCHIP_SPI_MAX_CS_NUM			2
+/* 2 for native cs, 2 for cs-gpio */
+#define ROCKCHIP_SPI_MAX_CS_NUM			4
 #define ROCKCHIP_SPI_VER2_TYPE1			0x05EC0002
 #define ROCKCHIP_SPI_VER2_TYPE2			0x00110002
 
@@ -197,13 +201,19 @@ static inline void spi_enable_chip(struct rockchip_spi *rs, bool enable)
 	writel_relaxed((enable ? 1U : 0U), rs->regs + ROCKCHIP_SPI_SSIENR);
 }
 
-static inline void wait_for_idle(struct rockchip_spi *rs)
+static inline void wait_for_tx_idle(struct rockchip_spi *rs, bool slave_mode)
 {
 	unsigned long timeout = jiffies + msecs_to_jiffies(5);
 
 	do {
-		if (!(readl_relaxed(rs->regs + ROCKCHIP_SPI_SR) & SR_BUSY))
-			return;
+		if (slave_mode) {
+			if (!(readl_relaxed(rs->regs + ROCKCHIP_SPI_SR) & SR_SLAVE_TX_BUSY) &&
+			    !((readl_relaxed(rs->regs + ROCKCHIP_SPI_SR) & SR_BUSY)))
+				return;
+		} else {
+			if (!(readl_relaxed(rs->regs + ROCKCHIP_SPI_SR) & SR_BUSY))
+				return;
+		}
 	} while (!time_after(jiffies, timeout));
 
 	dev_warn(rs->dev, "spi controller is in busy state!\n");
@@ -228,7 +238,7 @@ static void rockchip_spi_set_cs(struct spi_device *spi, bool enable)
 {
 	struct spi_controller *ctlr = spi->controller;
 	struct rockchip_spi *rs = spi_controller_get_devdata(ctlr);
-	bool cs_asserted = !enable;
+	bool cs_asserted = spi->mode & SPI_CS_HIGH ? enable : !enable;
 
 	/* Return immediately for no-op */
 	if (cs_asserted == rs->cs_asserted[spi->chip_select])
@@ -238,11 +248,15 @@ static void rockchip_spi_set_cs(struct spi_device *spi, bool enable)
 		/* Keep things powered as long as CS is asserted */
 		pm_runtime_get_sync(rs->dev);
 
-		ROCKCHIP_SPI_SET_BITS(rs->regs + ROCKCHIP_SPI_SER,
-				      BIT(spi->chip_select));
+		if (spi->cs_gpiod)
+			ROCKCHIP_SPI_SET_BITS(rs->regs + ROCKCHIP_SPI_SER, 1);
+		else
+			ROCKCHIP_SPI_SET_BITS(rs->regs + ROCKCHIP_SPI_SER, BIT(spi->chip_select));
 	} else {
-		ROCKCHIP_SPI_CLR_BITS(rs->regs + ROCKCHIP_SPI_SER,
-				      BIT(spi->chip_select));
+		if (spi->cs_gpiod)
+			ROCKCHIP_SPI_CLR_BITS(rs->regs + ROCKCHIP_SPI_SER, 1);
+		else
+			ROCKCHIP_SPI_CLR_BITS(rs->regs + ROCKCHIP_SPI_SER, BIT(spi->chip_select));
 
 		/* Drop reference from when we first asserted CS */
 		pm_runtime_put(rs->dev);
@@ -383,7 +397,7 @@ static void rockchip_spi_dma_txcb(void *data)
 		return;
 
 	/* Wait until the FIFO data completely. */
-	wait_for_idle(rs);
+	wait_for_tx_idle(rs, ctlr->slave);
 
 	spi_enable_chip(rs, false);
 	spi_finalize_current_transfer(ctlr);
@@ -495,6 +509,8 @@ static int rockchip_spi_config(struct rockchip_spi *rs,
 	cr0 |= (spi->mode & 0x3U) << CR0_SCPH_OFFSET;
 	if (spi->mode & SPI_LSB_FIRST)
 		cr0 |= CR0_FBM_LSB << CR0_FBM_OFFSET;
+	if (spi->mode & SPI_CS_HIGH)
+		cr0 |= BIT(spi->chip_select) << CR0_SOI_OFFSET;
 
 	if (xfer->rx_buf && xfer->tx_buf)
 		cr0 |= CR0_XFM_TR << CR0_XFM_OFFSET;
@@ -540,12 +556,12 @@ static int rockchip_spi_config(struct rockchip_spi *rs,
 	 * interrupt exactly when the fifo is full doesn't seem to work,
 	 * so we need the strict inequality here
 	 */
-	if (xfer->len < rs->fifo_len)
-		writel_relaxed(xfer->len - 1, rs->regs + ROCKCHIP_SPI_RXFTLR);
+	if ((xfer->len / rs->n_bytes) < rs->fifo_len)
+		writel_relaxed(xfer->len / rs->n_bytes - 1, rs->regs + ROCKCHIP_SPI_RXFTLR);
 	else
 		writel_relaxed(rs->fifo_len / 2 - 1, rs->regs + ROCKCHIP_SPI_RXFTLR);
 
-	writel_relaxed(rs->fifo_len / 2, rs->regs + ROCKCHIP_SPI_DMATDLR);
+	writel_relaxed(rs->fifo_len / 2 - 1, rs->regs + ROCKCHIP_SPI_DMATDLR);
 	writel_relaxed(rockchip_spi_calc_burst_size(xfer->len / rs->n_bytes) - 1,
 		       rs->regs + ROCKCHIP_SPI_DMARDLR);
 	writel_relaxed(dmacr, rs->regs + ROCKCHIP_SPI_DMACR);
@@ -783,6 +799,14 @@ static int rockchip_spi_probe(struct platform_device *pdev)
 		ctlr->can_dma = rockchip_spi_can_dma;
 	}
 
+	switch (readl_relaxed(rs->regs + ROCKCHIP_SPI_VERSION)) {
+	case ROCKCHIP_SPI_VER2_TYPE2:
+		ctlr->mode_bits |= SPI_CS_HIGH;
+		break;
+	default:
+		break;
+	}
+
 	ret = devm_spi_register_controller(&pdev->dev, ctlr);
 	if (ret < 0) {
 		dev_err(&pdev->dev, "Failed to register controller\n");
@@ -922,6 +946,7 @@ static const struct of_device_id rockchip_spi_dt_match[] = {
 	{ .compatible = "rockchip,rk3368-spi", },
 	{ .compatible = "rockchip,rk3399-spi", },
 	{ .compatible = "rockchip,rv1108-spi", },
+	{ .compatible = "rockchip,rv1126-spi", },
 	{ },
 };
 MODULE_DEVICE_TABLE(of, rockchip_spi_dt_match);