Re: [U-Boot] [PATCH v2 2/3] spi: zynqmp_qspi: Add QSPI driver support for ZynqMP

On 26.5.2016 08:58, Siva Durga Prasad Paladugu wrote:

This adds QSPI driver support for ZynqMP platform This driver supports all spi flash commands in qspi single mode.

Signed-off-by: Siva Durga Prasad Paladugu sivadur@xilinx.com

Changes for v2:

• set no_all_quad as zynqmp qspi controller doesnt support it

---

drivers/spi/Kconfig | 9 + drivers/spi/Makefile | 1 + drivers/spi/zynqmp_qspi.c | 705 +++++++++++++++++++++++++++++++++++++++++++++ 3 files changed, 715 insertions(+), 0 deletions(-) create mode 100644 drivers/spi/zynqmp_qspi.c

diff --git a/drivers/spi/Kconfig b/drivers/spi/Kconfig index f0258f8..25a98a6 100644 --- a/drivers/spi/Kconfig +++ b/drivers/spi/Kconfig @@ -155,6 +155,15 @@ 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_QSPI

• bool "ZynqMP QSPI driver"
• depends on ARCH_ZYNQMP
• help

•  Enable the ZynqMP Quad-SPI (QSPI) driver. This driver can be
  

•  used to access the SPI NOR flash on platforms embedding this
  

•  ZynqMP 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 OMAP3_SPI bool "McSPI driver for OMAP" help diff --git a/drivers/spi/Makefile b/drivers/spi/Makefile index 3eca745..b47103f 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_QSPI) += zynqmp_qspi.o diff --git a/drivers/spi/zynqmp_qspi.c b/drivers/spi/zynqmp_qspi.c new file mode 100644 index 0000000..93ace51 --- /dev/null +++ b/drivers/spi/zynqmp_qspi.c @@ -0,0 +1,705 @@ +/*

• • Xilinx ZynqMP Quad-SPI(QSPI) Controller Driver
• • (C) Copyright 2016 Xilinx, Inc
• • Siva Durga Prasad siva.durga.paladugu@xilinx.com
• • SPDX-License-Identifier: GPL-2.0+
• */

+#include <common.h> +#include <memalign.h> +#include <ubi_uboot.h> +#include <spi.h> +#include <spi_flash.h> +#include <asm/io.h> +#include "../mtd/spi/sf_internal.h"

+DECLARE_GLOBAL_DATA_PTR;

+/*

• • QSPI Config Register bit Masks
• */

+#define ZYNQMP_QSPI_CONFIG_STRT_MODE_MASK BIT(29) +#define ZYNQMP_QSPI_CONFIG_MODE_EN_MASK GENMASK(31, 30) +#define ZYNQMP_QSPI_CONFIG_DMA_MODE BIT(31) +#define ZYNQMP_QSPI_CONFIG_CPHA_MASK BIT(2) +#define ZYNQMP_QSPI_CONFIG_CPOL_MASK BIT(1) +#define ZYNQMP_QSPI_CONFIG_GFIFO_WP_HOLD BIT(19) +#define ZYNQMP_QSPI_CONFIG_BAUD_DIV_MASK GENMASK(5, 3) +#define ZYNQMP_QSPI_CONFIG_DFLT_BAUD_RATE_DIV BIT(3)

+/*

• • QSPI Interrupt Registers bit Masks
• */

+#define ZYNQMP_QSPI_IXR_TXNFULL_MASK BIT(2) +#define ZYNQMP_QSPI_IXR_TXFULL_MASK BIT(3) +#define ZYNQMP_QSPI_IXR_RXNEMTY_MASK BIT(4) +#define ZYNQMP_QSPI_IXR_GFEMTY_MASK BIT(7) +#define ZYNQMP_QSPI_IXR_ALL_MASK (ZYNQMP_QSPI_IXR_TXNFULL_MASK | \

• 			 ZYNQMP_QSPI_IXR_RXNEMTY_MASK)
  

+#define ZYNQMP_QSPI_GFIFO_ALL_INT_MASK 0xFBE

+/*

• • QSPI Enable Register bit Masks
• */

+#define ZYNQMP_QSPI_ENABLE_ENABLE_MASK BIT(0)

+/*

• • QSPI Generic FIFO register bit masks
• */

+#define ZYNQMP_QSPI_GFIFO_LOW_BUS BIT(14) +#define ZYNQMP_QSPI_GFIFO_CS_LOWER BIT(12) +#define ZYNQMP_QSPI_GFIFO_UP_BUS BIT(15) +#define ZYNQMP_QSPI_GFIFO_CS_UPPER BIT(13) +#define ZYNQMP_QSPI_GFIFO_SPI_MODE_QSPI GENMASK(11, 10) +#define ZYNQMP_QSPI_GFIFO_SPI_MODE_SPI BIT(10) +#define ZYNQMP_QSPI_GFIFO_TX BIT(16) +#define ZYNQMP_QSPI_GFIFO_RX BIT(17) +#define ZYNQMP_QSPI_GFIFO_STRIPE_MASK BIT(18) +#define ZYNQMP_QSPI_GFIFO_IMD_MASK GENMASK(7, 0) +#define ZYNQMP_QSPI_GFIFO_EXP_MASK BIT(9) +#define ZYNQMP_QSPI_GFIFO_DATA_XFR_MASK BIT(8)

+#define ZYNQMP_QSPI_GFIFO_IMD_DATA_CS_ASSERT 5 +#define ZYNQMP_QSPI_GFIFO_IMD_DATA_CS_DEASSERT 5 +#define ZYNQMP_QSPI_GFIFO_EXP_INIT_VAL 8 +#define ZYNQMP_QSPI_GFIFO_IMD_MAX_DATA_LEN 255 +/*

• • QSPI DMA Destination status register bit masks
• */

+#define ZYNQMP_QSPI_DMA_DST_I_STS_DONE BIT(1) +#define ZYNQMP_QSPI_DMA_DST_I_STS_MASK GENMASK(7, 1)

+/*

• • QSPI Generic QSPI selection register bit mask
• */

+#define ZYNQMP_QSPI_GQSPI_SELECT BIT(0)

+#define ZYNQMP_QSPI_FIFO_THRESHOLD 1

+#define SPI_XFER_ON_BOTH 0 +#define SPI_XFER_ON_LOWER 1 +#define SPI_XFER_ON_UPPER 2

+#define ZYNQMP_QSPI_DMA_ALIGN 0x4 +#define ZYNQMP_QSPI_DMA_POLL_TIMEOUT 10000000

+#define ZYNQMP_QSPI_GENERIC_BASEADDR_OFFSET 0x100 +#define ZYNQMP_QSPI_GENERIC_DMABASE_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 */

+};

+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 */

+};

+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;
• u8 mode;
• u32 freq;
• const void *tx_buf;
• void *rx_buf;
• unsigned len;
• int bytes_to_transfer;
• int bytes_to_receive;
• unsigned int is_inst;
• unsigned int is_dual;
• unsigned int u_page;
• unsigned int bus;
• unsigned int stripe;
• unsigned cs_change:1;

+};

+static u8 last_cmd;

+static int zynqmp_qspi_ofdata_to_platdata(struct udevice *bus) +{

• struct zynqmp_qspi_platdata *plat = bus->platdata;
• const void *blob = gd->fdt_blob;
• int node = bus->of_offset;
• debug("%s\n", __func__);
• plat->regs = (struct zynqmp_qspi_regs *)(dev_get_addr(bus) +

• 			 ZYNQMP_QSPI_GENERIC_BASEADDR_OFFSET);
  

• plat->dma_regs = (struct zynqmp_qspi_dma_regs *)(dev_get_addr(bus) +

• 			 ZYNQMP_QSPI_GENERIC_DMABASE_OFFSET);
  

• plat->frequency = fdtdec_get_int(blob, node, "spi-max-frequency",

• 			 166666666);
  

• plat->speed_hz = plat->frequency / 2;
• return 0;

+}

+static void zynqmp_qspi_init_hw(struct zynqmp_qspi_priv *priv) +{

• u32 config_reg;
• struct zynqmp_qspi_regs *regs = priv->regs;
• writel(ZYNQMP_QSPI_GQSPI_SELECT, &regs->gqspisel);
• writel(ZYNQMP_QSPI_GFIFO_ALL_INT_MASK, &regs->idisr);
• writel(ZYNQMP_QSPI_FIFO_THRESHOLD, &regs->txftr);
• writel(ZYNQMP_QSPI_FIFO_THRESHOLD, &regs->rxftr);
• writel(ZYNQMP_QSPI_GFIFO_ALL_INT_MASK, &regs->isr);
• config_reg = readl(&regs->confr);
• config_reg &= ~(ZYNQMP_QSPI_CONFIG_STRT_MODE_MASK |

• 	ZYNQMP_QSPI_CONFIG_MODE_EN_MASK);
  

• config_reg |= ZYNQMP_QSPI_CONFIG_DMA_MODE |

•       ZYNQMP_QSPI_CONFIG_GFIFO_WP_HOLD |
  

•       ZYNQMP_QSPI_CONFIG_DFLT_BAUD_RATE_DIV;
  

• writel(config_reg, &regs->confr);
• writel(ZYNQMP_QSPI_ENABLE_ENABLE_MASK, &regs->enbr);

+}

+static u32 zynqmp_qspi_bus_select(struct zynqmp_qspi_priv *priv) +{

• u32 gqspi_fifo_reg = 0;
• gqspi_fifo_reg = ZYNQMP_QSPI_GFIFO_LOW_BUS |

• 	 ZYNQMP_QSPI_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;
• u32 reg;
• do {

• reg = readl(&regs->isr);
  

• } while (!(reg & ZYNQMP_QSPI_IXR_GFEMTY_MASK));
• 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 |= ZYNQMP_QSPI_GFIFO_SPI_MODE_SPI |
  

• 		  ZYNQMP_QSPI_GFIFO_IMD_DATA_CS_ASSERT;
  

• } else {

• gqspi_fifo_reg = ZYNQMP_QSPI_GFIFO_LOW_BUS;
  

• gqspi_fifo_reg |= ZYNQMP_QSPI_GFIFO_IMD_DATA_CS_DEASSERT;
  

• }
• debug("GFIFO_CMD_CS: 0x%x\n", gqspi_fifo_reg);
• zynqmp_qspi_fill_gen_fifo(priv, gqspi_fifo_reg);

+}

+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;
• uint32_t 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 divisor 8, if the freq is 0 */
  

• baud_rate_val = 0x2;
  

• } else if (plat->speed_hz != speed) {

• while ((baud_rate_val < 8) &&
  

•        ((plat->frequency /
  

•        (2 << baud_rate_val)) > speed))
  

• 	baud_rate_val++;
  

• plat->speed_hz = speed / (2 << baud_rate_val);
  

• }
• confr &= ~ZYNQMP_QSPI_CONFIG_BAUD_DIV_MASK;
• confr |= (baud_rate_val << 3);
• writel(confr, &regs->confr);
• priv->freq = speed;
• debug("regs=%p, mode=%d\n", priv->regs, priv->freq);
• return 0;

+}

+static int zynqmp_qspi_child_pre_probe(struct udevice *bus) +{

• struct spi_slave *slave = dev_get_parent_priv(bus);
• slave->mode_rx = QUAD_OUTPUT_FAST;
• slave->mode = SPI_TX_QUAD;
• slave->no_all_quad = 1;
• 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);
• debug("zynqmp_qspi_probe: bus:%p, priv:%p\n", bus, priv);
• priv->regs = plat->regs;
• priv->dma_regs = plat->dma_regs;
• /* 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;
• uint32_t confr;
• debug("%s\n", __func__);
• /* Set the SPI Clock phase and polarities */
• confr = readl(&regs->confr);
• confr &= ~(ZYNQMP_QSPI_CONFIG_CPHA_MASK |

•    ZYNQMP_QSPI_CONFIG_CPOL_MASK);
  

• if (priv->mode & SPI_CPHA)

• confr |= ZYNQMP_QSPI_CONFIG_CPHA_MASK;
  

• if (priv->mode & SPI_CPOL)

• confr |= ZYNQMP_QSPI_CONFIG_CPOL_MASK;
  

• priv->mode = mode;
• debug("regs=%p, mode=%d\n", priv->regs, priv->mode);
• return 0;

+}

+static int zynqmp_qspi_fill_tx_fifo(struct zynqmp_qspi_priv *priv, u32 size) +{

• u32 data;
• u32 timeout = ZYNQMP_QSPI_DMA_POLL_TIMEOUT;
• 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 && timeout) {

• if (readl(&regs->isr) &
  

• 	ZYNQMP_QSPI_IXR_TXNFULL_MASK) {
  

• 	if (size >= 4) {
  

• 		writel(*buf, &regs->txd0r);
  

• 		buf++;
  

• 		size -= 4;
  

• 	} else {
  

• 		switch (size) {
  

• 		case 1:
  

• 			data = *((u8 *)buf);
  

• 			buf += 1;
  

• 			data |= 0xFFFFFF00;
  

• 			break;
  

• 		case 2:
  

• 			data = *((u16 *)buf);
  

• 			buf += 2;
  

• 			data |= 0xFFFF0000;
  

• 			break;
  

• 		case 3:
  

• 			data = *((u16 *)buf);
  

• 			buf += 2;
  

• 			data |= (*((u8 *)buf) << 16);
  

• 			buf += 1;
  

• 			data |= 0xFF000000;
  

• 			break;
  

• 		}
  

• 		writel(data, &regs->txd0r);
  

• 		size = 0;
  

• 	}
  

• } else {
  

• 	udelay(1);
  

• 	timeout--;
  

• }
  

• }
• if (!timeout) {

• debug("zynqmp_qspi_fill_tx_fifo: Timeout\n");
  

• return -1;
  

• }
• priv->tx_buf += len;
• return 0;

+}

+static void zynqmp_qspi_genfifo_cmd(struct zynqmp_qspi_priv *priv) +{

• u8 command = 1;
• u32 gen_fifo_cmd;
• u32 bytecount = 0;
• while (priv->len) {

• gen_fifo_cmd = zynqmp_qspi_bus_select(priv);
  

• gen_fifo_cmd |= ZYNQMP_QSPI_GFIFO_TX;
  

• if (command) {
  

• 	command = 0;
  

• 	last_cmd = *(u8 *)priv->tx_buf;
  

• }
  

• gen_fifo_cmd |= ZYNQMP_QSPI_GFIFO_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 = ZYNQMP_QSPI_GFIFO_EXP_INIT_VAL;
• u32 len;
• while (1) {

• if (priv->len > ZYNQMP_QSPI_GFIFO_IMD_MAX_DATA_LEN) {
  

• 	if (priv->len & (1 << expval)) {
  

• 		*gen_fifo_cmd &= ~ZYNQMP_QSPI_GFIFO_IMD_MASK;
  

• 		*gen_fifo_cmd |= ZYNQMP_QSPI_GFIFO_EXP_MASK;
  

• 		*gen_fifo_cmd |= expval;
  

• 		priv->len -= (1 << expval);
  

• 		return expval;
  

• 	}
  

• 	expval++;
  

• } else {
  

• 	*gen_fifo_cmd &= ~(ZYNQMP_QSPI_GFIFO_IMD_MASK |
  

• 			  ZYNQMP_QSPI_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 |= ZYNQMP_QSPI_GFIFO_TX |

• 	ZYNQMP_QSPI_GFIFO_DATA_XFR_MASK;
  

• if (priv->stripe)

• gen_fifo_cmd |= ZYNQMP_QSPI_GFIFO_STRIPE_MASK;
  

• if (last_cmd == CMD_QUAD_PAGE_PROGRAM)

• gen_fifo_cmd |= ZYNQMP_QSPI_GFIFO_SPI_MODE_QSPI;
  

• else

• gen_fifo_cmd |= ZYNQMP_QSPI_GFIFO_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 & ZYNQMP_QSPI_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 timeout = ZYNQMP_QSPI_DMA_POLL_TIMEOUT;
• u32 actuallen = priv->len;
• struct zynqmp_qspi_dma_regs *dma_regs = priv->dma_regs;
• writel((unsigned long)buf, &dma_regs->dmadst);
• writel(roundup(priv->len, 4), &dma_regs->dmasize);
• writel(ZYNQMP_QSPI_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 & ZYNQMP_QSPI_GFIFO_EXP_MASK) &&
  

•     (len % 4)) {
  

• 	gen_fifo_cmd &= ~(0xFF);
  

• 	gen_fifo_cmd |= (len/4 + 1) * 4;
  

• }
  

• zynqmp_qspi_fill_gen_fifo(priv, gen_fifo_cmd);
  

• debug("GFIFO_CMD_RX:0x%x\n", gen_fifo_cmd);
  

• }
• while (timeout) {

• if (readl(&dma_regs->dmaisr) &
  

•     ZYNQMP_QSPI_DMA_DST_I_STS_DONE) {
  

• 	writel(ZYNQMP_QSPI_DMA_DST_I_STS_DONE,
  

• 	       &dma_regs->dmaisr);
  

• 	break;
  

• }
  

• udelay(1);
  

• timeout--;
  

• }
• 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 (!timeout) {

• debug("DMA Timeout:0x%x\n", readl(&dma_regs->dmaisr));
  

• return -1;
  

• }
• 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 |= ZYNQMP_QSPI_GFIFO_RX |

• 	ZYNQMP_QSPI_GFIFO_DATA_XFR_MASK;
  

• if (last_cmd == CMD_READ_QUAD_OUTPUT_FAST ||

•    last_cmd == CMD_READ_QUAD_IO_FAST)
  

• gen_fifo_cmd |= ZYNQMP_QSPI_GFIFO_SPI_MODE_QSPI;
  

• else

• gen_fifo_cmd |= ZYNQMP_QSPI_GFIFO_SPI_MODE_SPI;
  

• if (priv->stripe)

• gen_fifo_cmd |= ZYNQMP_QSPI_GFIFO_STRIPE_MASK;
  

• /*

• * 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 & (ZYNQMP_QSPI_DMA_ALIGN - 1)) &&

•    !(actuallen % ZYNQMP_QSPI_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,

• 				  ZYNQMP_QSPI_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
  

• 	ret = -1;
  

• } 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
  

• 	ret = -1;
  

• }
• return ret;

+}

+static int zynqmp_qspi_transfer(struct zynqmp_qspi_priv *priv) +{

• static unsigned 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 = -1;
  

• 	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;
• debug("%s\n", __func__);
• writel(ZYNQMP_QSPI_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;
• u32 regval;
• debug("%s\n", __func__);
• regval = readl(&regs->enbr);
• regval &= ~ZYNQMP_QSPI_ENABLE_ENABLE_MASK;
• writel(regval, &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;
• 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;
  

• priv->u_page = 0;
• priv->stripe = 0;
• priv->bus = 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,
• .child_pre_probe = zynqmp_qspi_child_pre_probe,

+};

Tested-by: Michal Simek michal.simek@xilinx.com

Thanks, Michal