[U-Boot] [PATCH v7 1/2] spi: zynqmp_gqspi: Add support for ZynqMP qspi driver

* [U-Boot] [PATCH v7 1/2] spi: zynqmp_gqspi: Add support for ZynqMP qspi driver
@ 2018-07-04 12:01 Siva Durga Prasad Paladugu
  2018-07-04 12:01 ` [U-Boot] [PATCH v7 2/2] zynqmp: zcu102: Add qspi driver support for ZynqMP zcu102 boards Siva Durga Prasad Paladugu
  2018-07-16  8:30 ` [U-Boot] [PATCH v7 1/2] spi: zynqmp_gqspi: Add support for ZynqMP qspi driver Jagan Teki
  0 siblings, 2 replies; 6+ messages in thread
From: Siva Durga Prasad Paladugu @ 2018-07-04 12:01 UTC (permalink / raw)
  To: u-boot

This patch adds qspi driver support for ZynqMP SoC. This
driver is responsible for communicating with qspi flash
devices.

Signed-off-by: Siva Durga Prasad Paladugu <siva.durga.paladugu@xilinx.com>
---
Changes for v7:
- Removed reading of mode, clock phase and polarity from ofdata_to_platdata
  as drivercan get from spi-uclass if required

Changes for v6:
- Removed spi_flash.h inclusion and other unused macros
- Fixed coding style comments
- Removed tx_rx_mode in plat and removed preprobe routine.
- Used proper error codes

Changed for v5:
- Removed zynqm_gqspi.h file which was added
  by mistake.

Changes for v4:
- Moved macro definitions back to .c
- Removed last_cmd and flash command checks in driver
- Used macros and GENMASK as per comments
- Removed debugs wherever commented.
- Modified set_mode routine as per comment

Changes for v3:
- Renamed all macros, functions, files and configs as per comment
- Used wait_for_bit wherever required
- Removed unnecessary header inclusion

Changes for v2:
- Rebased on top of latest master
- Moved macro definitions to .h file as per comment
- Fixed magic values with macros as per comment
---
 drivers/spi/Kconfig        |   7 +
 drivers/spi/Makefile       |   1 +
 drivers/spi/zynqmp_gqspi.c | 734 +++++++++++++++++++++++++++++++++++++++++++++
 3 files changed, 742 insertions(+)
 create mode 100644 drivers/spi/zynqmp_gqspi.c

diff --git a/drivers/spi/Kconfig b/drivers/spi/Kconfig
index 3532c2a..c3c424e 100644
--- a/drivers/spi/Kconfig
+++ b/drivers/spi/Kconfig
@@ -223,6 +223,13 @@ config ZYNQ_QSPI
 	  Zynq QSPI IP core. This IP is used to connect the flash in
 	  4-bit qspi, 8-bit dual stacked and shared 4-bit dual parallel.
 
+config ZYNQMP_GQSPI
+	bool "Configure ZynqMP Generic QSPI"
+	depends on ARCH_ZYNQMP
+	help
+	  This option is used to enable ZynqMP QSPI controller driver which
+	  is used to communicate with qspi flash devices.
+
 endif # if DM_SPI
 
 config SOFT_SPI
diff --git a/drivers/spi/Makefile b/drivers/spi/Makefile
index 5a2c00e..2187633 100644
--- a/drivers/spi/Makefile
+++ b/drivers/spi/Makefile
@@ -51,3 +51,4 @@ obj-$(CONFIG_TI_QSPI) += ti_qspi.o
 obj-$(CONFIG_XILINX_SPI) += xilinx_spi.o
 obj-$(CONFIG_ZYNQ_SPI) += zynq_spi.o
 obj-$(CONFIG_ZYNQ_QSPI) += zynq_qspi.o
+obj-$(CONFIG_ZYNQMP_GQSPI) += zynqmp_gqspi.o
diff --git a/drivers/spi/zynqmp_gqspi.c b/drivers/spi/zynqmp_gqspi.c
new file mode 100644
index 0000000..665f98e
--- /dev/null
+++ b/drivers/spi/zynqmp_gqspi.c
@@ -0,0 +1,734 @@
+// SPDX-License-Identifier: GPL-2.0+
+/*
+ * (C) Copyright 2018 Xilinx
+ *
+ * Xilinx ZynqMP Generic Quad-SPI(QSPI) controller driver(master mode only)
+ */
+
+#include <common.h>
+#include <asm/arch/clk.h>
+#include <asm/arch/hardware.h>
+#include <asm/arch/sys_proto.h>
+#include <asm/io.h>
+#include <clk.h>
+#include <dm.h>
+#include <malloc.h>
+#include <memalign.h>
+#include <spi.h>
+#include <ubi_uboot.h>
+#include <wait_bit.h>
+
+#define GQSPI_GFIFO_STRT_MODE_MASK	BIT(29)
+#define GQSPI_CONFIG_MODE_EN_MASK	(3 << 30)
+#define GQSPI_CONFIG_DMA_MODE		(2 << 30)
+#define GQSPI_CONFIG_CPHA_MASK		BIT(2)
+#define GQSPI_CONFIG_CPOL_MASK		BIT(1)
+
+/* QSPI MIO's count for different connection topologies */
+#define GQSPI_MIO_NUM_QSPI0		6
+#define GQSPI_MIO_NUM_QSPI1		5
+#define GQSPI_MIO_NUM_QSPI1_CS		1
+
+/*
+ * QSPI Interrupt Registers bit Masks
+ *
+ * All the four interrupt registers (Status/Mask/Enable/Disable) have the same
+ * bit definitions.
+ */
+#define GQSPI_IXR_TXNFULL_MASK		0x00000004 /* QSPI TX FIFO Overflow */
+#define GQSPI_IXR_TXFULL_MASK		0x00000008 /* QSPI TX FIFO is full */
+#define GQSPI_IXR_RXNEMTY_MASK		0x00000010 /* QSPI RX FIFO Not Empty */
+#define GQSPI_IXR_GFEMTY_MASK		0x00000080 /* QSPI Generic FIFO Empty */
+#define GQSPI_IXR_ALL_MASK		(GQSPI_IXR_TXNFULL_MASK | \
+					 GQSPI_IXR_RXNEMTY_MASK)
+
+/*
+ * QSPI Enable Register bit Masks
+ *
+ * This register is used to enable or disable the QSPI controller
+ */
+#define GQSPI_ENABLE_ENABLE_MASK	0x00000001 /* QSPI Enable Bit Mask */
+
+#define GQSPI_GFIFO_LOW_BUS		BIT(14)
+#define GQSPI_GFIFO_CS_LOWER		BIT(12)
+#define GQSPI_GFIFO_UP_BUS		BIT(15)
+#define GQSPI_GFIFO_CS_UPPER		BIT(13)
+#define GQSPI_SPI_MODE_QSPI		(3 << 10)
+#define GQSPI_SPI_MODE_SPI		BIT(10)
+#define GQSPI_SPI_MODE_DUAL_SPI		(2 << 10)
+#define GQSPI_IMD_DATA_CS_ASSERT	5
+#define GQSPI_IMD_DATA_CS_DEASSERT	5
+#define GQSPI_GFIFO_TX			BIT(16)
+#define GQSPI_GFIFO_RX			BIT(17)
+#define GQSPI_GFIFO_STRIPE_MASK		BIT(18)
+#define GQSPI_GFIFO_IMD_MASK		0xFF
+#define GQSPI_GFIFO_EXP_MASK		BIT(9)
+#define GQSPI_GFIFO_DATA_XFR_MASK	BIT(8)
+#define GQSPI_STRT_GEN_FIFO		BIT(28)
+#define GQSPI_GEN_FIFO_STRT_MOD		BIT(29)
+#define GQSPI_GFIFO_WP_HOLD		BIT(19)
+#define GQSPI_BAUD_DIV_MASK		(7 << 3)
+#define GQSPI_DFLT_BAUD_RATE_DIV	BIT(3)
+#define GQSPI_GFIFO_ALL_INT_MASK	0xFBE
+#define GQSPI_DMA_DST_I_STS_DONE	BIT(1)
+#define GQSPI_DMA_DST_I_STS_MASK	0xFE
+#define MODEBITS			0x6
+
+#define GQSPI_GFIFO_SELECT		BIT(0)
+#define GQSPI_FIFO_THRESHOLD		1
+
+#define SPI_XFER_ON_BOTH		0
+#define SPI_XFER_ON_LOWER		1
+#define SPI_XFER_ON_UPPER		2
+
+#define GQSPI_DMA_ALIGN			0x4
+#define GQSPI_MAX_BAUD_RATE_VAL		7
+#define GQSPI_DFLT_BAUD_RATE_VAL	2
+
+#define GQSPI_TIMEOUT			100000000
+
+#define GQSPI_BAUD_DIV_SHIFT		2
+#define GQSPI_LPBK_DLY_ADJ_LPBK_SHIFT	5
+#define GQSPI_LPBK_DLY_ADJ_DLY_1	0x2
+#define GQSPI_LPBK_DLY_ADJ_DLY_1_SHIFT	3
+#define GQSPI_LPBK_DLY_ADJ_DLY_0	0x3
+#define GQSPI_USE_DATA_DLY		0x1
+#define GQSPI_USE_DATA_DLY_SHIFT	31
+#define GQSPI_DATA_DLY_ADJ_VALUE	0x2
+#define GQSPI_DATA_DLY_ADJ_SHIFT	28
+#define TAP_DLY_BYPASS_LQSPI_RX_VALUE	0x1
+#define TAP_DLY_BYPASS_LQSPI_RX_SHIFT	2
+#define GQSPI_DATA_DLY_ADJ_OFST		0x000001F8
+#define IOU_TAPDLY_BYPASS_OFST		0xFF180390
+#define GQSPI_LPBK_DLY_ADJ_LPBK_MASK	0x00000020
+#define GQSPI_FREQ_40MHZ		40000000
+#define GQSPI_FREQ_100MHZ		100000000
+#define GQSPI_FREQ_150MHZ		150000000
+#define IOU_TAPDLY_BYPASS_MASK		0x7
+
+#define GQSPI_REG_OFFSET		0x100
+#define GQSPI_DMA_REG_OFFSET		0x800
+
+/* QSPI register offsets */
+struct zynqmp_qspi_regs {
+	u32 confr;	/* 0x00 */
+	u32 isr;	/* 0x04 */
+	u32 ier;	/* 0x08 */
+	u32 idisr;	/* 0x0C */
+	u32 imaskr;	/* 0x10 */
+	u32 enbr;	/* 0x14 */
+	u32 dr;		/* 0x18 */
+	u32 txd0r;	/* 0x1C */
+	u32 drxr;	/* 0x20 */
+	u32 sicr;	/* 0x24 */
+	u32 txftr;	/* 0x28 */
+	u32 rxftr;	/* 0x2C */
+	u32 gpior;	/* 0x30 */
+	u32 reserved0;	/* 0x34 */
+	u32 lpbkdly;	/* 0x38 */
+	u32 reserved1;	/* 0x3C */
+	u32 genfifo;	/* 0x40 */
+	u32 gqspisel;	/* 0x44 */
+	u32 reserved2;	/* 0x48 */
+	u32 gqfifoctrl;	/* 0x4C */
+	u32 gqfthr;	/* 0x50 */
+	u32 gqpollcfg;	/* 0x54 */
+	u32 gqpollto;	/* 0x58 */
+	u32 gqxfersts;	/* 0x5C */
+	u32 gqfifosnap;	/* 0x60 */
+	u32 gqrxcpy;	/* 0x64 */
+	u32 reserved3[36];	/* 0x68 */
+	u32 gqspidlyadj;	/* 0xF8 */
+};
+
+struct zynqmp_qspi_dma_regs {
+	u32 dmadst;	/* 0x00 */
+	u32 dmasize;	/* 0x04 */
+	u32 dmasts;	/* 0x08 */
+	u32 dmactrl;	/* 0x0C */
+	u32 reserved0;	/* 0x10 */
+	u32 dmaisr;	/* 0x14 */
+	u32 dmaier;	/* 0x18 */
+	u32 dmaidr;	/* 0x1C */
+	u32 dmaimr;	/* 0x20 */
+	u32 dmactrl2;	/* 0x24 */
+	u32 dmadstmsb;	/* 0x28 */
+};
+
+DECLARE_GLOBAL_DATA_PTR;
+
+struct zynqmp_qspi_platdata {
+	struct zynqmp_qspi_regs *regs;
+	struct zynqmp_qspi_dma_regs *dma_regs;
+	u32 frequency;
+	u32 speed_hz;
+};
+
+struct zynqmp_qspi_priv {
+	struct zynqmp_qspi_regs *regs;
+	struct zynqmp_qspi_dma_regs *dma_regs;
+	const void *tx_buf;
+	void *rx_buf;
+	unsigned int len;
+	int bytes_to_transfer;
+	int bytes_to_receive;
+	unsigned int is_inst;
+	unsigned int cs_change:1;
+};
+
+static int zynqmp_qspi_ofdata_to_platdata(struct udevice *bus)
+{
+	struct zynqmp_qspi_platdata *plat = bus->platdata;
+
+	debug("%s\n", __func__);
+
+	plat->regs = (struct zynqmp_qspi_regs *)(devfdt_get_addr(bus) +
+						 GQSPI_REG_OFFSET);
+	plat->dma_regs = (struct zynqmp_qspi_dma_regs *)
+			  (devfdt_get_addr(bus) + GQSPI_DMA_REG_OFFSET);
+
+	return 0;
+}
+
+static void zynqmp_qspi_init_hw(struct zynqmp_qspi_priv *priv)
+{
+	u32 config_reg;
+	struct zynqmp_qspi_regs *regs = priv->regs;
+
+	writel(GQSPI_GFIFO_SELECT, &regs->gqspisel);
+	writel(GQSPI_GFIFO_ALL_INT_MASK, &regs->idisr);
+	writel(GQSPI_FIFO_THRESHOLD, &regs->txftr);
+	writel(GQSPI_FIFO_THRESHOLD, &regs->rxftr);
+	writel(GQSPI_GFIFO_ALL_INT_MASK, &regs->isr);
+
+	config_reg = readl(&regs->confr);
+	config_reg &= ~(GQSPI_GFIFO_STRT_MODE_MASK |
+			GQSPI_CONFIG_MODE_EN_MASK);
+	config_reg |= GQSPI_CONFIG_DMA_MODE |
+		      GQSPI_GFIFO_WP_HOLD |
+		      GQSPI_DFLT_BAUD_RATE_DIV;
+	writel(config_reg, &regs->confr);
+
+	writel(GQSPI_ENABLE_ENABLE_MASK, &regs->enbr);
+}
+
+static u32 zynqmp_qspi_bus_select(struct zynqmp_qspi_priv *priv)
+{
+	u32 gqspi_fifo_reg = 0;
+
+	gqspi_fifo_reg = GQSPI_GFIFO_LOW_BUS |
+			 GQSPI_GFIFO_CS_LOWER;
+
+	return gqspi_fifo_reg;
+}
+
+static void zynqmp_qspi_fill_gen_fifo(struct zynqmp_qspi_priv *priv,
+				      u32 gqspi_fifo_reg)
+{
+	struct zynqmp_qspi_regs *regs = priv->regs;
+	int ret = 0;
+
+	ret = wait_for_bit_le32(&regs->isr, GQSPI_IXR_GFEMTY_MASK, 1,
+				GQSPI_TIMEOUT, 1);
+	if (ret)
+		printf("%s Timeout\n", __func__);
+
+	writel(gqspi_fifo_reg, &regs->genfifo);
+}
+
+static void zynqmp_qspi_chipselect(struct zynqmp_qspi_priv *priv, int is_on)
+{
+	u32 gqspi_fifo_reg = 0;
+
+	if (is_on) {
+		gqspi_fifo_reg = zynqmp_qspi_bus_select(priv);
+		gqspi_fifo_reg |= GQSPI_SPI_MODE_SPI |
+				  GQSPI_IMD_DATA_CS_ASSERT;
+	} else {
+		gqspi_fifo_reg = GQSPI_GFIFO_LOW_BUS;
+		gqspi_fifo_reg |= GQSPI_IMD_DATA_CS_DEASSERT;
+	}
+
+	debug("GFIFO_CMD_CS: 0x%x\n", gqspi_fifo_reg);
+
+	zynqmp_qspi_fill_gen_fifo(priv, gqspi_fifo_reg);
+}
+
+void zynqmp_qspi_set_tapdelay(struct udevice *bus, u32 baudrateval)
+{
+	struct zynqmp_qspi_platdata *plat = bus->platdata;
+	struct zynqmp_qspi_priv *priv = dev_get_priv(bus);
+	struct zynqmp_qspi_regs *regs = priv->regs;
+	u32 tapdlybypass = 0, lpbkdlyadj = 0, datadlyadj = 0, clk_rate;
+	u32 reqhz = 0;
+
+	clk_rate = plat->frequency;
+	reqhz = (clk_rate / (GQSPI_BAUD_DIV_SHIFT << baudrateval));
+
+	debug("%s, req_hz:%d, clk_rate:%d, baudrateval:%d\n",
+	      __func__, reqhz, clk_rate, baudrateval);
+
+	if (reqhz < GQSPI_FREQ_40MHZ) {
+		zynqmp_mmio_read(IOU_TAPDLY_BYPASS_OFST, &tapdlybypass);
+		tapdlybypass |= (TAP_DLY_BYPASS_LQSPI_RX_VALUE <<
+				TAP_DLY_BYPASS_LQSPI_RX_SHIFT);
+	} else if (reqhz < GQSPI_FREQ_100MHZ) {
+		zynqmp_mmio_read(IOU_TAPDLY_BYPASS_OFST, &tapdlybypass);
+		tapdlybypass |= (TAP_DLY_BYPASS_LQSPI_RX_VALUE <<
+				TAP_DLY_BYPASS_LQSPI_RX_SHIFT);
+		lpbkdlyadj = readl(&regs->lpbkdly);
+		lpbkdlyadj |= (GQSPI_LPBK_DLY_ADJ_LPBK_MASK);
+		datadlyadj = readl(&regs->gqspidlyadj);
+		datadlyadj |= ((GQSPI_USE_DATA_DLY << GQSPI_USE_DATA_DLY_SHIFT)
+				| (GQSPI_DATA_DLY_ADJ_VALUE <<
+					GQSPI_DATA_DLY_ADJ_SHIFT));
+	} else if (reqhz < GQSPI_FREQ_150MHZ) {
+		lpbkdlyadj = readl(&regs->lpbkdly);
+		lpbkdlyadj |= ((GQSPI_LPBK_DLY_ADJ_LPBK_MASK) |
+				GQSPI_LPBK_DLY_ADJ_DLY_0);
+	}
+
+	zynqmp_mmio_write(IOU_TAPDLY_BYPASS_OFST, IOU_TAPDLY_BYPASS_MASK,
+			  tapdlybypass);
+	writel(lpbkdlyadj, &regs->lpbkdly);
+	writel(datadlyadj, &regs->gqspidlyadj);
+}
+
+static int zynqmp_qspi_set_speed(struct udevice *bus, uint speed)
+{
+	struct zynqmp_qspi_platdata *plat = bus->platdata;
+	struct zynqmp_qspi_priv *priv = dev_get_priv(bus);
+	struct zynqmp_qspi_regs *regs = priv->regs;
+	u32 confr;
+	u8 baud_rate_val = 0;
+
+	debug("%s\n", __func__);
+	if (speed > plat->frequency)
+		speed = plat->frequency;
+
+	/* Set the clock frequency */
+	confr = readl(&regs->confr);
+	if (speed == 0) {
+		/* Set baudrate x8, if the freq is 0 */
+		baud_rate_val = GQSPI_DFLT_BAUD_RATE_VAL;
+	} else if (plat->speed_hz != speed) {
+		while ((baud_rate_val < 8) &&
+		       ((plat->frequency /
+		       (2 << baud_rate_val)) > speed))
+			baud_rate_val++;
+
+		if (baud_rate_val > GQSPI_MAX_BAUD_RATE_VAL)
+			baud_rate_val = GQSPI_DFLT_BAUD_RATE_VAL;
+
+		plat->speed_hz = plat->frequency / (2 << baud_rate_val);
+	}
+	confr &= ~GQSPI_BAUD_DIV_MASK;
+	confr |= (baud_rate_val << 3);
+	writel(confr, &regs->confr);
+
+	zynqmp_qspi_set_tapdelay(bus, baud_rate_val);
+	debug("regs=%p, speed=%d\n", priv->regs, plat->speed_hz);
+
+	return 0;
+}
+
+static int zynqmp_qspi_probe(struct udevice *bus)
+{
+	struct zynqmp_qspi_platdata *plat = dev_get_platdata(bus);
+	struct zynqmp_qspi_priv *priv = dev_get_priv(bus);
+	struct clk clk;
+	unsigned long clock;
+	int ret;
+
+	debug("%s: bus:%p, priv:%p\n", __func__, bus, priv);
+
+	priv->regs = plat->regs;
+	priv->dma_regs = plat->dma_regs;
+
+	ret = clk_get_by_index(bus, 0, &clk);
+	if (ret < 0) {
+		dev_err(dev, "failed to get clock\n");
+		return ret;
+	}
+
+	clock = clk_get_rate(&clk);
+	if (IS_ERR_VALUE(clock)) {
+		dev_err(dev, "failed to get rate\n");
+		return clock;
+	}
+	debug("%s: CLK %ld\n", __func__, clock);
+
+	ret = clk_enable(&clk);
+	if (ret && ret != -ENOSYS) {
+		dev_err(dev, "failed to enable clock\n");
+		return ret;
+	}
+	plat->frequency = clock;
+	plat->speed_hz = plat->frequency / 2;
+
+	/* init the zynq spi hw */
+	zynqmp_qspi_init_hw(priv);
+
+	return 0;
+}
+
+static int zynqmp_qspi_set_mode(struct udevice *bus, uint mode)
+{
+	struct zynqmp_qspi_priv *priv = dev_get_priv(bus);
+	struct zynqmp_qspi_regs *regs = priv->regs;
+	u32 confr;
+
+	debug("%s\n", __func__);
+	/* Set the SPI Clock phase and polarities */
+	confr = readl(&regs->confr);
+	confr &= ~(GQSPI_CONFIG_CPHA_MASK |
+		   GQSPI_CONFIG_CPOL_MASK);
+
+	if (mode & SPI_CPHA)
+		confr |= GQSPI_CONFIG_CPHA_MASK;
+	if (mode & SPI_CPOL)
+		confr |= GQSPI_CONFIG_CPOL_MASK;
+
+	writel(confr, &regs->confr);
+
+	return 0;
+}
+
+static int zynqmp_qspi_fill_tx_fifo(struct zynqmp_qspi_priv *priv, u32 size)
+{
+	u32 data;
+	int ret = 0;
+	struct zynqmp_qspi_regs *regs = priv->regs;
+	u32 *buf = (u32 *)priv->tx_buf;
+	u32 len = size;
+
+	debug("TxFIFO: 0x%x, size: 0x%x\n", readl(&regs->isr),
+	      size);
+
+	while (size) {
+		ret = wait_for_bit_le32(&regs->isr, GQSPI_IXR_TXNFULL_MASK, 1,
+					GQSPI_TIMEOUT, 1);
+		if (ret) {
+			printf("%s: Timeout\n", __func__);
+			return ret;
+		}
+
+		if (size >= 4) {
+			writel(*buf, &regs->txd0r);
+			buf++;
+			size -= 4;
+		} else {
+			switch (size) {
+			case 1:
+				data = *((u8 *)buf);
+				buf += 1;
+				data |= GENMASK(31, 8);
+				break;
+			case 2:
+				data = *((u16 *)buf);
+				buf += 2;
+				data |= GENMASK(31, 16);
+				break;
+			case 3:
+				data = *((u16 *)buf);
+				buf += 2;
+				data |= (*((u8 *)buf) << 16);
+				buf += 1;
+				data |= GENMASK(31, 24);
+				break;
+			}
+			writel(data, &regs->txd0r);
+			size = 0;
+		}
+	}
+
+	priv->tx_buf += len;
+	return 0;
+}
+
+static void zynqmp_qspi_genfifo_cmd(struct zynqmp_qspi_priv *priv)
+{
+	u32 gen_fifo_cmd;
+	u32 bytecount = 0;
+
+	while (priv->len) {
+		gen_fifo_cmd = zynqmp_qspi_bus_select(priv);
+		gen_fifo_cmd |= GQSPI_GFIFO_TX | GQSPI_SPI_MODE_SPI;
+		gen_fifo_cmd |= *(u8 *)priv->tx_buf;
+		bytecount++;
+		priv->len--;
+		priv->tx_buf = (u8 *)priv->tx_buf + 1;
+
+		debug("GFIFO_CMD_Cmd = 0x%x\n", gen_fifo_cmd);
+
+		zynqmp_qspi_fill_gen_fifo(priv, gen_fifo_cmd);
+	}
+}
+
+static u32 zynqmp_qspi_calc_exp(struct zynqmp_qspi_priv *priv,
+				u32 *gen_fifo_cmd)
+{
+	u32 expval = 8;
+	u32 len;
+
+	while (1) {
+		if (priv->len > 255) {
+			if (priv->len & (1 << expval)) {
+				*gen_fifo_cmd &= ~GQSPI_GFIFO_IMD_MASK;
+				*gen_fifo_cmd |= GQSPI_GFIFO_EXP_MASK;
+				*gen_fifo_cmd |= expval;
+				priv->len -= (1 << expval);
+				return expval;
+			}
+			expval++;
+		} else {
+			*gen_fifo_cmd &= ~(GQSPI_GFIFO_IMD_MASK |
+					  GQSPI_GFIFO_EXP_MASK);
+			*gen_fifo_cmd |= (u8)priv->len;
+			len = (u8)priv->len;
+			priv->len  = 0;
+			return len;
+		}
+	}
+}
+
+static int zynqmp_qspi_genfifo_fill_tx(struct zynqmp_qspi_priv *priv)
+{
+	u32 gen_fifo_cmd;
+	u32 len;
+	int ret = 0;
+
+	gen_fifo_cmd = zynqmp_qspi_bus_select(priv);
+	gen_fifo_cmd |= GQSPI_GFIFO_TX |
+			GQSPI_GFIFO_DATA_XFR_MASK;
+
+	gen_fifo_cmd |= GQSPI_SPI_MODE_SPI;
+
+	while (priv->len) {
+		len = zynqmp_qspi_calc_exp(priv, &gen_fifo_cmd);
+		zynqmp_qspi_fill_gen_fifo(priv, gen_fifo_cmd);
+
+		debug("GFIFO_CMD_TX:0x%x\n", gen_fifo_cmd);
+
+		if (gen_fifo_cmd & GQSPI_GFIFO_EXP_MASK)
+			ret = zynqmp_qspi_fill_tx_fifo(priv,
+						       1 << len);
+		else
+			ret = zynqmp_qspi_fill_tx_fifo(priv,
+						       len);
+
+		if (ret)
+			return ret;
+	}
+	return ret;
+}
+
+static int zynqmp_qspi_start_dma(struct zynqmp_qspi_priv *priv,
+				 u32 gen_fifo_cmd, u32 *buf)
+{
+	u32 addr;
+	u32 size, len;
+	u32 actuallen = priv->len;
+	int ret = 0;
+	struct zynqmp_qspi_dma_regs *dma_regs = priv->dma_regs;
+
+	writel((unsigned long)buf, &dma_regs->dmadst);
+	writel(roundup(priv->len, ARCH_DMA_MINALIGN), &dma_regs->dmasize);
+	writel(GQSPI_DMA_DST_I_STS_MASK, &dma_regs->dmaier);
+	addr = (unsigned long)buf;
+	size = roundup(priv->len, ARCH_DMA_MINALIGN);
+	flush_dcache_range(addr, addr + size);
+
+	while (priv->len) {
+		len = zynqmp_qspi_calc_exp(priv, &gen_fifo_cmd);
+		if (!(gen_fifo_cmd & GQSPI_GFIFO_EXP_MASK) &&
+		    (len % ARCH_DMA_MINALIGN)) {
+			gen_fifo_cmd &= ~GENMASK(7, 0);
+			gen_fifo_cmd |= roundup(len, ARCH_DMA_MINALIGN);
+		}
+		zynqmp_qspi_fill_gen_fifo(priv, gen_fifo_cmd);
+
+		debug("GFIFO_CMD_RX:0x%x\n", gen_fifo_cmd);
+	}
+
+	ret = wait_for_bit_le32(&dma_regs->dmaisr, GQSPI_DMA_DST_I_STS_DONE,
+				1, GQSPI_TIMEOUT, 1);
+	if (ret) {
+		printf("DMA Timeout:0x%x\n", readl(&dma_regs->dmaisr));
+		return -ETIMEDOUT;
+	}
+
+	writel(GQSPI_DMA_DST_I_STS_DONE, &dma_regs->dmaisr);
+
+	debug("buf:0x%lx, rxbuf:0x%lx, *buf:0x%x len: 0x%x\n",
+	      (unsigned long)buf, (unsigned long)priv->rx_buf, *buf,
+	      actuallen);
+
+	if (buf != priv->rx_buf)
+		memcpy(priv->rx_buf, buf, actuallen);
+
+	return 0;
+}
+
+static int zynqmp_qspi_genfifo_fill_rx(struct zynqmp_qspi_priv *priv)
+{
+	u32 gen_fifo_cmd;
+	u32 *buf;
+	u32 actuallen = priv->len;
+
+	gen_fifo_cmd = zynqmp_qspi_bus_select(priv);
+	gen_fifo_cmd |= GQSPI_GFIFO_RX |
+			GQSPI_GFIFO_DATA_XFR_MASK;
+
+	gen_fifo_cmd |= GQSPI_SPI_MODE_SPI;
+
+	/*
+	 * Check if receive buffer is aligned to 4 byte and length
+	 * is multiples of four byte as we are using dma to receive.
+	 */
+	if (!((unsigned long)priv->rx_buf & (GQSPI_DMA_ALIGN - 1)) &&
+	    !(actuallen % GQSPI_DMA_ALIGN)) {
+		buf = (u32 *)priv->rx_buf;
+		return zynqmp_qspi_start_dma(priv, gen_fifo_cmd, buf);
+	}
+
+	ALLOC_CACHE_ALIGN_BUFFER(u8, tmp, roundup(priv->len,
+						  GQSPI_DMA_ALIGN));
+	buf = (u32 *)tmp;
+	return zynqmp_qspi_start_dma(priv, gen_fifo_cmd, buf);
+}
+
+static int zynqmp_qspi_start_transfer(struct zynqmp_qspi_priv *priv)
+{
+	int ret = 0;
+
+	if (priv->is_inst) {
+		if (priv->tx_buf)
+			zynqmp_qspi_genfifo_cmd(priv);
+		else
+			return -EINVAL;
+	} else {
+		if (priv->tx_buf)
+			ret = zynqmp_qspi_genfifo_fill_tx(priv);
+		else if (priv->rx_buf)
+			ret = zynqmp_qspi_genfifo_fill_rx(priv);
+		else
+			return -EINVAL;
+	}
+	return ret;
+}
+
+static int zynqmp_qspi_transfer(struct zynqmp_qspi_priv *priv)
+{
+	static unsigned int cs_change = 1;
+	int status = 0;
+
+	debug("%s\n", __func__);
+
+	while (1) {
+		/* Select the chip if required */
+		if (cs_change)
+			zynqmp_qspi_chipselect(priv, 1);
+
+		cs_change = priv->cs_change;
+
+		if (!priv->tx_buf && !priv->rx_buf && priv->len) {
+			status = -EINVAL;
+			break;
+		}
+
+		/* Request the transfer */
+		if (priv->len) {
+			status = zynqmp_qspi_start_transfer(priv);
+			priv->is_inst = 0;
+			if (status < 0)
+				break;
+		}
+
+		if (cs_change)
+			/* Deselect the chip */
+			zynqmp_qspi_chipselect(priv, 0);
+		break;
+	}
+
+	return status;
+}
+
+static int zynqmp_qspi_claim_bus(struct udevice *dev)
+{
+	struct udevice *bus = dev->parent;
+	struct zynqmp_qspi_priv *priv = dev_get_priv(bus);
+	struct zynqmp_qspi_regs *regs = priv->regs;
+
+	writel(GQSPI_ENABLE_ENABLE_MASK, &regs->enbr);
+
+	return 0;
+}
+
+static int zynqmp_qspi_release_bus(struct udevice *dev)
+{
+	struct udevice *bus = dev->parent;
+	struct zynqmp_qspi_priv *priv = dev_get_priv(bus);
+	struct zynqmp_qspi_regs *regs = priv->regs;
+
+	writel(~GQSPI_ENABLE_ENABLE_MASK, &regs->enbr);
+
+	return 0;
+}
+
+int zynqmp_qspi_xfer(struct udevice *dev, unsigned int bitlen, const void *dout,
+		     void *din, unsigned long flags)
+{
+	struct udevice *bus = dev->parent;
+	struct zynqmp_qspi_priv *priv = dev_get_priv(bus);
+
+	debug("%s: priv: 0x%08lx bitlen: %d dout: 0x%08lx ", __func__,
+	      (unsigned long)priv, bitlen, (unsigned long)dout);
+	debug("din: 0x%08lx flags: 0x%lx\n", (unsigned long)din, flags);
+
+	priv->tx_buf = dout;
+	priv->rx_buf = din;
+	priv->len = bitlen / 8;
+
+	/*
+	 * Assume that the beginning of a transfer with bits to
+	 * transmit must contain a device command.
+	 */
+	if (dout && flags & SPI_XFER_BEGIN)
+		priv->is_inst = 1;
+	else
+		priv->is_inst = 0;
+
+	if (flags & SPI_XFER_END)
+		priv->cs_change = 1;
+	else
+		priv->cs_change = 0;
+
+	zynqmp_qspi_transfer(priv);
+
+	return 0;
+}
+
+static const struct dm_spi_ops zynqmp_qspi_ops = {
+	.claim_bus      = zynqmp_qspi_claim_bus,
+	.release_bus    = zynqmp_qspi_release_bus,
+	.xfer           = zynqmp_qspi_xfer,
+	.set_speed      = zynqmp_qspi_set_speed,
+	.set_mode       = zynqmp_qspi_set_mode,
+};
+
+static const struct udevice_id zynqmp_qspi_ids[] = {
+	{ .compatible = "xlnx,zynqmp-qspi-1.0" },
+	{ }
+};
+
+U_BOOT_DRIVER(zynqmp_qspi) = {
+	.name   = "zynqmp_qspi",
+	.id     = UCLASS_SPI,
+	.of_match = zynqmp_qspi_ids,
+	.ops    = &zynqmp_qspi_ops,
+	.ofdata_to_platdata = zynqmp_qspi_ofdata_to_platdata,
+	.platdata_auto_alloc_size = sizeof(struct zynqmp_qspi_platdata),
+	.priv_auto_alloc_size = sizeof(struct zynqmp_qspi_priv),
+	.probe  = zynqmp_qspi_probe,
+};
-- 
2.7.4

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