drivers/spi/stm32_qspi.c - platform/external/u-boot - Gitiles

 // SPDX-License-Identifier: GPL-2.0+
 /*
  * (C) Copyright 2016
  *
  * Michael Kurz, <michi.kurz@gmail.com>
  *
  * STM32 QSPI driver
  */

 #define LOG_CATEGORY UCLASS_SPI

 #include <common.h>
 #include <clk.h>
 #include <dm.h>
 #include <log.h>
 #include <reset.h>
 #include <spi.h>
 #include <spi-mem.h>
 #include <watchdog.h>
 #include <dm/device_compat.h>
 #include <linux/bitops.h>
 #include <linux/delay.h>
 #include <linux/iopoll.h>
 #include <linux/ioport.h>
 #include <linux/sizes.h>

 struct stm32_qspi_regs {
 	u32 cr;		/* 0x00 */
 	u32 dcr;	/* 0x04 */
 	u32 sr;		/* 0x08 */
 	u32 fcr;	/* 0x0C */
 	u32 dlr;	/* 0x10 */
 	u32 ccr;	/* 0x14 */
 	u32 ar;		/* 0x18 */
 	u32 abr;	/* 0x1C */
 	u32 dr;		/* 0x20 */
 	u32 psmkr;	/* 0x24 */
 	u32 psmar;	/* 0x28 */
 	u32 pir;	/* 0x2C */
 	u32 lptr;	/* 0x30 */
 };

 /*
  * QUADSPI control register
  */
 #define STM32_QSPI_CR_EN		BIT(0)
 #define STM32_QSPI_CR_ABORT		BIT(1)
 #define STM32_QSPI_CR_DMAEN		BIT(2)
 #define STM32_QSPI_CR_TCEN		BIT(3)
 #define STM32_QSPI_CR_SSHIFT		BIT(4)
 #define STM32_QSPI_CR_DFM		BIT(6)
 #define STM32_QSPI_CR_FSEL		BIT(7)
 #define STM32_QSPI_CR_FTHRES_SHIFT	8
 #define STM32_QSPI_CR_TEIE		BIT(16)
 #define STM32_QSPI_CR_TCIE		BIT(17)
 #define STM32_QSPI_CR_FTIE		BIT(18)
 #define STM32_QSPI_CR_SMIE		BIT(19)
 #define STM32_QSPI_CR_TOIE		BIT(20)
 #define STM32_QSPI_CR_APMS		BIT(22)
 #define STM32_QSPI_CR_PMM		BIT(23)
 #define STM32_QSPI_CR_PRESCALER_MASK	GENMASK(7, 0)
 #define STM32_QSPI_CR_PRESCALER_SHIFT	24

 /*
  * QUADSPI device configuration register
  */
 #define STM32_QSPI_DCR_CKMODE		BIT(0)
 #define STM32_QSPI_DCR_CSHT_MASK	GENMASK(2, 0)
 #define STM32_QSPI_DCR_CSHT_SHIFT	8
 #define STM32_QSPI_DCR_FSIZE_MASK	GENMASK(4, 0)
 #define STM32_QSPI_DCR_FSIZE_SHIFT	16

 /*
  * QUADSPI status register
  */
 #define STM32_QSPI_SR_TEF		BIT(0)
 #define STM32_QSPI_SR_TCF		BIT(1)
 #define STM32_QSPI_SR_FTF		BIT(2)
 #define STM32_QSPI_SR_SMF		BIT(3)
 #define STM32_QSPI_SR_TOF		BIT(4)
 #define STM32_QSPI_SR_BUSY		BIT(5)

 /*
  * QUADSPI flag clear register
  */
 #define STM32_QSPI_FCR_CTEF		BIT(0)
 #define STM32_QSPI_FCR_CTCF		BIT(1)
 #define STM32_QSPI_FCR_CSMF		BIT(3)
 #define STM32_QSPI_FCR_CTOF		BIT(4)

 /*
  * QUADSPI communication configuration register
  */
 #define STM32_QSPI_CCR_DDRM		BIT(31)
 #define STM32_QSPI_CCR_DHHC		BIT(30)
 #define STM32_QSPI_CCR_SIOO		BIT(28)
 #define STM32_QSPI_CCR_FMODE_SHIFT	26
 #define STM32_QSPI_CCR_DMODE_SHIFT	24
 #define STM32_QSPI_CCR_DCYC_SHIFT	18
 #define STM32_QSPI_CCR_ABSIZE_SHIFT	16
 #define STM32_QSPI_CCR_ABMODE_SHIFT	14
 #define STM32_QSPI_CCR_ADSIZE_SHIFT	12
 #define STM32_QSPI_CCR_ADMODE_SHIFT	10
 #define STM32_QSPI_CCR_IMODE_SHIFT	8

 #define STM32_QSPI_CCR_IND_WRITE	0
 #define STM32_QSPI_CCR_IND_READ		1
 #define STM32_QSPI_CCR_MEM_MAP		3

 #define STM32_QSPI_MAX_MMAP_SZ		SZ_256M
 #define STM32_QSPI_MAX_CHIP		2

 #define STM32_QSPI_FIFO_TIMEOUT_US	30000
 #define STM32_QSPI_CMD_TIMEOUT_US	1000000
 #define STM32_BUSY_TIMEOUT_US		100000
 #define STM32_ABT_TIMEOUT_US		100000

 struct stm32_qspi_flash {
 	u32 cr;
 	u32 dcr;
 	bool initialized;
 };

 struct stm32_qspi_priv {
 	struct stm32_qspi_regs *regs;
 	struct stm32_qspi_flash flash[STM32_QSPI_MAX_CHIP];
 	void __iomem *mm_base;
 	resource_size_t mm_size;
 	ulong clock_rate;
 	int cs_used;
 };

 static int _stm32_qspi_wait_for_not_busy(struct stm32_qspi_priv *priv)
 {
 	u32 sr;
 	int ret;

 	ret = readl_poll_timeout(&priv->regs->sr, sr,
 				 !(sr & STM32_QSPI_SR_BUSY),
 				 STM32_BUSY_TIMEOUT_US);
 	if (ret)
 		log_err("busy timeout (stat:%#x)\n", sr);

 	return ret;
 }

 static int _stm32_qspi_wait_cmd(struct stm32_qspi_priv *priv,
 				const struct spi_mem_op *op)
 {
 	u32 sr;
 	int ret = 0;

 	ret = readl_poll_timeout(&priv->regs->sr, sr,
 				 sr & STM32_QSPI_SR_TCF,
 				 STM32_QSPI_CMD_TIMEOUT_US);
 	if (ret) {
 		log_err("cmd timeout (stat:%#x)\n", sr);
 	} else if (readl(&priv->regs->sr) & STM32_QSPI_SR_TEF) {
 		log_err("transfer error (stat:%#x)\n", sr);
 		ret = -EIO;
 	}

 	/* clear flags */
 	writel(STM32_QSPI_FCR_CTCF | STM32_QSPI_FCR_CTEF, &priv->regs->fcr);

 	if (!ret)
 		ret = _stm32_qspi_wait_for_not_busy(priv);

 	return ret;
 }

 static void _stm32_qspi_read_fifo(u8 *val, void __iomem *addr)
 {
 	*val = readb(addr);
 	WATCHDOG_RESET();
 }

 static void _stm32_qspi_write_fifo(u8 *val, void __iomem *addr)
 {
 	writeb(*val, addr);
 }

 static int _stm32_qspi_poll(struct stm32_qspi_priv *priv,
 			    const struct spi_mem_op *op)
 {
 	void (*fifo)(u8 *val, void __iomem *addr);
 	u32 len = op->data.nbytes, sr;
 	u8 *buf;
 	int ret;

 	if (op->data.dir == SPI_MEM_DATA_IN) {
 		fifo = _stm32_qspi_read_fifo;
 		buf = op->data.buf.in;

 	} else {
 		fifo = _stm32_qspi_write_fifo;
 		buf = (u8 *)op->data.buf.out;
 	}

 	while (len--) {
 		ret = readl_poll_timeout(&priv->regs->sr, sr,
 					 sr & STM32_QSPI_SR_FTF,
 					 STM32_QSPI_FIFO_TIMEOUT_US);
 		if (ret) {
 			log_err("fifo timeout (len:%d stat:%#x)\n", len, sr);
 			return ret;
 		}

 		fifo(buf++, &priv->regs->dr);
 	}

 	return 0;
 }

 static int stm32_qspi_mm(struct stm32_qspi_priv *priv,
 			 const struct spi_mem_op *op)
 {
 	memcpy_fromio(op->data.buf.in, priv->mm_base + op->addr.val,
 		      op->data.nbytes);

 	return 0;
 }

 static int _stm32_qspi_tx(struct stm32_qspi_priv *priv,
 			  const struct spi_mem_op *op,
 			  u8 mode)
 {
 	if (!op->data.nbytes)
 		return 0;

 	if (mode == STM32_QSPI_CCR_MEM_MAP)
 		return stm32_qspi_mm(priv, op);

 	return _stm32_qspi_poll(priv, op);
 }

 static int _stm32_qspi_get_mode(u8 buswidth)
 {
 	if (buswidth == 4)
 		return 3;

 	return buswidth;
 }

 static int stm32_qspi_exec_op(struct spi_slave *slave,
 			      const struct spi_mem_op *op)
 {
 	struct stm32_qspi_priv *priv = dev_get_priv(slave->dev->parent);
 	u32 cr, ccr, addr_max;
 	u8 mode = STM32_QSPI_CCR_IND_WRITE;
 	int timeout, ret;

 	dev_dbg(slave->dev, "cmd:%#x mode:%d.%d.%d.%d addr:%#llx len:%#x\n",
 		op->cmd.opcode, op->cmd.buswidth, op->addr.buswidth,
 		op->dummy.buswidth, op->data.buswidth,
 		op->addr.val, op->data.nbytes);

 	addr_max = op->addr.val + op->data.nbytes + 1;

 	if (op->data.dir == SPI_MEM_DATA_IN && op->data.nbytes) {
 		if (addr_max < priv->mm_size && op->addr.buswidth)
 			mode = STM32_QSPI_CCR_MEM_MAP;
 		else
 			mode = STM32_QSPI_CCR_IND_READ;
 	}

 	if (op->data.nbytes)
 		writel(op->data.nbytes - 1, &priv->regs->dlr);

 	ccr = (mode << STM32_QSPI_CCR_FMODE_SHIFT);
 	ccr |= op->cmd.opcode;
 	ccr |= (_stm32_qspi_get_mode(op->cmd.buswidth)
 		<< STM32_QSPI_CCR_IMODE_SHIFT);

 	if (op->addr.nbytes) {
 		ccr |= ((op->addr.nbytes - 1) << STM32_QSPI_CCR_ADSIZE_SHIFT);
 		ccr |= (_stm32_qspi_get_mode(op->addr.buswidth)
 			<< STM32_QSPI_CCR_ADMODE_SHIFT);
 	}

 	if (op->dummy.buswidth && op->dummy.nbytes)
 		ccr |= (op->dummy.nbytes * 8 / op->dummy.buswidth
 			<< STM32_QSPI_CCR_DCYC_SHIFT);

 	if (op->data.nbytes)
 		ccr |= (_stm32_qspi_get_mode(op->data.buswidth)
 			<< STM32_QSPI_CCR_DMODE_SHIFT);

 	writel(ccr, &priv->regs->ccr);

 	if (op->addr.nbytes && mode != STM32_QSPI_CCR_MEM_MAP)
 		writel(op->addr.val, &priv->regs->ar);

 	ret = _stm32_qspi_tx(priv, op, mode);
 	/*
 	 * Abort in:
 	 * -error case
 	 * -read memory map: prefetching must be stopped if we read the last
 	 *  byte of device (device size - fifo size). like device size is not
 	 *  knows, the prefetching is always stop.
 	 */
 	if (ret || mode == STM32_QSPI_CCR_MEM_MAP)
 		goto abort;

 	/* Wait end of tx in indirect mode */
 	ret = _stm32_qspi_wait_cmd(priv, op);
 	if (ret)
 		goto abort;

 	return 0;

 abort:
 	setbits_le32(&priv->regs->cr, STM32_QSPI_CR_ABORT);

 	/* Wait clear of abort bit by hw */
 	timeout = readl_poll_timeout(&priv->regs->cr, cr,
 				     !(cr & STM32_QSPI_CR_ABORT),
 				     STM32_ABT_TIMEOUT_US);

 	writel(STM32_QSPI_FCR_CTCF, &priv->regs->fcr);

 	if (ret || timeout)
 		dev_err(slave->dev, "ret:%d abort timeout:%d\n", ret, timeout);

 	return ret;
 }

 static int stm32_qspi_probe(struct udevice *bus)
 {
 	struct stm32_qspi_priv *priv = dev_get_priv(bus);
 	struct resource res;
 	struct clk clk;
 	struct reset_ctl reset_ctl;
 	int ret;

 	ret = dev_read_resource_byname(bus, "qspi", &res);
 	if (ret) {
 		dev_err(bus, "can't get regs base addresses(ret = %d)!\n", ret);
 		return ret;
 	}

 	priv->regs = (struct stm32_qspi_regs *)res.start;

 	ret = dev_read_resource_byname(bus, "qspi_mm", &res);
 	if (ret) {
 		dev_err(bus, "can't get mmap base address(ret = %d)!\n", ret);
 		return ret;
 	}

 	priv->mm_base = (void __iomem *)res.start;

 	priv->mm_size = resource_size(&res);
 	if (priv->mm_size > STM32_QSPI_MAX_MMAP_SZ)
 		return -EINVAL;

 	dev_dbg(bus, "regs=<0x%p> mapped=<0x%p> mapped_size=<0x%lx>\n",
 		priv->regs, priv->mm_base, priv->mm_size);

 	ret = clk_get_by_index(bus, 0, &clk);
 	if (ret < 0)
 		return ret;

 	ret = clk_enable(&clk);
 	if (ret) {
 		dev_err(bus, "failed to enable clock\n");
 		return ret;
 	}

 	priv->clock_rate = clk_get_rate(&clk);
 	if (!priv->clock_rate) {
 		clk_disable(&clk);
 		return -EINVAL;
 	}

 	ret = reset_get_by_index(bus, 0, &reset_ctl);
 	if (ret) {
 		if (ret != -ENOENT) {
 			dev_err(bus, "failed to get reset\n");
 			clk_disable(&clk);
 			return ret;
 		}
 	} else {
 		/* Reset QSPI controller */
 		reset_assert(&reset_ctl);
 		udelay(2);
 		reset_deassert(&reset_ctl);
 	}

 	priv->cs_used = -1;

 	setbits_le32(&priv->regs->cr, STM32_QSPI_CR_SSHIFT);

 	/* Set dcr fsize to max address */
 	setbits_le32(&priv->regs->dcr,
 		     STM32_QSPI_DCR_FSIZE_MASK << STM32_QSPI_DCR_FSIZE_SHIFT);

 	return 0;
 }

 static int stm32_qspi_claim_bus(struct udevice *dev)
 {
 	struct stm32_qspi_priv *priv = dev_get_priv(dev->parent);
 	struct dm_spi_slave_plat *slave_plat = dev_get_parent_plat(dev);
 	int slave_cs = slave_plat->cs;

 	if (slave_cs >= STM32_QSPI_MAX_CHIP)
 		return -ENODEV;

 	if (priv->cs_used != slave_cs) {
 		struct stm32_qspi_flash *flash = &priv->flash[slave_cs];

 		priv->cs_used = slave_cs;

 		if (flash->initialized) {
 			/* Set the configuration: speed + cs */
 			writel(flash->cr, &priv->regs->cr);
 			writel(flash->dcr, &priv->regs->dcr);
 		} else {
 			/* Set chip select */
 			clrsetbits_le32(&priv->regs->cr, STM32_QSPI_CR_FSEL,
 					priv->cs_used ? STM32_QSPI_CR_FSEL : 0);

 			/* Save the configuration: speed + cs */
 			flash->cr = readl(&priv->regs->cr);
 			flash->dcr = readl(&priv->regs->dcr);

 			flash->initialized = true;
 		}
 	}

 	setbits_le32(&priv->regs->cr, STM32_QSPI_CR_EN);

 	return 0;
 }

 static int stm32_qspi_release_bus(struct udevice *dev)
 {
 	struct stm32_qspi_priv *priv = dev_get_priv(dev->parent);

 	clrbits_le32(&priv->regs->cr, STM32_QSPI_CR_EN);

 	return 0;
 }

 static int stm32_qspi_set_speed(struct udevice *bus, uint speed)
 {
 	struct stm32_qspi_priv *priv = dev_get_priv(bus);
 	u32 qspi_clk = priv->clock_rate;
 	u32 prescaler = 255;
 	u32 csht;
 	int ret;

 	if (speed > 0) {
 		prescaler = 0;
 		if (qspi_clk) {
 			prescaler = DIV_ROUND_UP(qspi_clk, speed) - 1;
 			if (prescaler > 255)
 				prescaler = 255;
 		}
 	}

 	csht = DIV_ROUND_UP((5 * qspi_clk) / (prescaler + 1), 100000000);
 	csht = (csht - 1) & STM32_QSPI_DCR_CSHT_MASK;

 	ret = _stm32_qspi_wait_for_not_busy(priv);
 	if (ret)
 		return ret;

 	clrsetbits_le32(&priv->regs->cr,
 			STM32_QSPI_CR_PRESCALER_MASK <<
 			STM32_QSPI_CR_PRESCALER_SHIFT,
 			prescaler << STM32_QSPI_CR_PRESCALER_SHIFT);

 	clrsetbits_le32(&priv->regs->dcr,
 			STM32_QSPI_DCR_CSHT_MASK << STM32_QSPI_DCR_CSHT_SHIFT,
 			csht << STM32_QSPI_DCR_CSHT_SHIFT);

 	dev_dbg(bus, "regs=%p, speed=%d\n", priv->regs,
 		(qspi_clk / (prescaler + 1)));

 	return 0;
 }

 static int stm32_qspi_set_mode(struct udevice *bus, uint mode)
 {
 	struct stm32_qspi_priv *priv = dev_get_priv(bus);
 	int ret;
 	const char *str_rx, *str_tx;

 	ret = _stm32_qspi_wait_for_not_busy(priv);
 	if (ret)
 		return ret;

 	if ((mode & SPI_CPHA) && (mode & SPI_CPOL))
 		setbits_le32(&priv->regs->dcr, STM32_QSPI_DCR_CKMODE);
 	else if (!(mode & SPI_CPHA) && !(mode & SPI_CPOL))
 		clrbits_le32(&priv->regs->dcr, STM32_QSPI_DCR_CKMODE);
 	else
 		return -ENODEV;

 	if (mode & SPI_CS_HIGH)
 		return -ENODEV;

 	if (mode & SPI_RX_QUAD)
 		str_rx = "quad";
 	else if (mode & SPI_RX_DUAL)
 		str_rx = "dual";
 	else
 		str_rx = "single";

 	if (mode & SPI_TX_QUAD)
 		str_tx = "quad";
 	else if (mode & SPI_TX_DUAL)
 		str_tx = "dual";
 	else
 		str_tx = "single";

 	dev_dbg(bus, "regs=%p, mode=%d rx: %s, tx: %s\n",
 		priv->regs, mode, str_rx, str_tx);

 	return 0;
 }

 static const struct spi_controller_mem_ops stm32_qspi_mem_ops = {
 	.exec_op = stm32_qspi_exec_op,
 };

 static const struct dm_spi_ops stm32_qspi_ops = {
 	.claim_bus	= stm32_qspi_claim_bus,
 	.release_bus	= stm32_qspi_release_bus,
 	.set_speed	= stm32_qspi_set_speed,
 	.set_mode	= stm32_qspi_set_mode,
 	.mem_ops	= &stm32_qspi_mem_ops,
 };

 static const struct udevice_id stm32_qspi_ids[] = {
 	{ .compatible = "st,stm32f469-qspi" },
 	{ }
 };

 U_BOOT_DRIVER(stm32_qspi) = {
 	.name = "stm32_qspi",
 	.id = UCLASS_SPI,
 	.of_match = stm32_qspi_ids,
 	.ops = &stm32_qspi_ops,
 	.priv_auto	= sizeof(struct stm32_qspi_priv),
 	.probe = stm32_qspi_probe,
 };
	// SPDX-License-Identifier: GPL-2.0+
	/*
	* (C) Copyright 2016
	*
	* Michael Kurz, <michi.kurz@gmail.com>
	*
	* STM32 QSPI driver
	*/

	#define LOG_CATEGORY UCLASS_SPI

	#include <common.h>
	#include <clk.h>
	#include <dm.h>
	#include <log.h>
	#include <reset.h>
	#include <spi.h>
	#include <spi-mem.h>
	#include <watchdog.h>
	#include <dm/device_compat.h>
	#include <linux/bitops.h>
	#include <linux/delay.h>
	#include <linux/iopoll.h>
	#include <linux/ioport.h>
	#include <linux/sizes.h>

	struct stm32_qspi_regs {
	u32 cr; /* 0x00 */
	u32 dcr; /* 0x04 */
	u32 sr; /* 0x08 */
	u32 fcr; /* 0x0C */
	u32 dlr; /* 0x10 */
	u32 ccr; /* 0x14 */
	u32 ar; /* 0x18 */
	u32 abr; /* 0x1C */
	u32 dr; /* 0x20 */
	u32 psmkr; /* 0x24 */
	u32 psmar; /* 0x28 */
	u32 pir; /* 0x2C */
	u32 lptr; /* 0x30 */
	};

	/*
	* QUADSPI control register
	*/
	#define STM32_QSPI_CR_EN BIT(0)
	#define STM32_QSPI_CR_ABORT BIT(1)
	#define STM32_QSPI_CR_DMAEN BIT(2)
	#define STM32_QSPI_CR_TCEN BIT(3)
	#define STM32_QSPI_CR_SSHIFT BIT(4)
	#define STM32_QSPI_CR_DFM BIT(6)
	#define STM32_QSPI_CR_FSEL BIT(7)
	#define STM32_QSPI_CR_FTHRES_SHIFT 8
	#define STM32_QSPI_CR_TEIE BIT(16)
	#define STM32_QSPI_CR_TCIE BIT(17)
	#define STM32_QSPI_CR_FTIE BIT(18)
	#define STM32_QSPI_CR_SMIE BIT(19)
	#define STM32_QSPI_CR_TOIE BIT(20)
	#define STM32_QSPI_CR_APMS BIT(22)
	#define STM32_QSPI_CR_PMM BIT(23)
	#define STM32_QSPI_CR_PRESCALER_MASK GENMASK(7, 0)
	#define STM32_QSPI_CR_PRESCALER_SHIFT 24

	/*
	* QUADSPI device configuration register
	*/
	#define STM32_QSPI_DCR_CKMODE BIT(0)
	#define STM32_QSPI_DCR_CSHT_MASK GENMASK(2, 0)
	#define STM32_QSPI_DCR_CSHT_SHIFT 8
	#define STM32_QSPI_DCR_FSIZE_MASK GENMASK(4, 0)
	#define STM32_QSPI_DCR_FSIZE_SHIFT 16

	/*
	* QUADSPI status register
	*/
	#define STM32_QSPI_SR_TEF BIT(0)
	#define STM32_QSPI_SR_TCF BIT(1)
	#define STM32_QSPI_SR_FTF BIT(2)
	#define STM32_QSPI_SR_SMF BIT(3)
	#define STM32_QSPI_SR_TOF BIT(4)
	#define STM32_QSPI_SR_BUSY BIT(5)

	/*
	* QUADSPI flag clear register
	*/
	#define STM32_QSPI_FCR_CTEF BIT(0)
	#define STM32_QSPI_FCR_CTCF BIT(1)
	#define STM32_QSPI_FCR_CSMF BIT(3)
	#define STM32_QSPI_FCR_CTOF BIT(4)

	/*
	* QUADSPI communication configuration register
	*/
	#define STM32_QSPI_CCR_DDRM BIT(31)
	#define STM32_QSPI_CCR_DHHC BIT(30)
	#define STM32_QSPI_CCR_SIOO BIT(28)
	#define STM32_QSPI_CCR_FMODE_SHIFT 26
	#define STM32_QSPI_CCR_DMODE_SHIFT 24
	#define STM32_QSPI_CCR_DCYC_SHIFT 18
	#define STM32_QSPI_CCR_ABSIZE_SHIFT 16
	#define STM32_QSPI_CCR_ABMODE_SHIFT 14
	#define STM32_QSPI_CCR_ADSIZE_SHIFT 12
	#define STM32_QSPI_CCR_ADMODE_SHIFT 10
	#define STM32_QSPI_CCR_IMODE_SHIFT 8

	#define STM32_QSPI_CCR_IND_WRITE 0
	#define STM32_QSPI_CCR_IND_READ 1
	#define STM32_QSPI_CCR_MEM_MAP 3

	#define STM32_QSPI_MAX_MMAP_SZ SZ_256M
	#define STM32_QSPI_MAX_CHIP 2

	#define STM32_QSPI_FIFO_TIMEOUT_US 30000
	#define STM32_QSPI_CMD_TIMEOUT_US 1000000
	#define STM32_BUSY_TIMEOUT_US 100000
	#define STM32_ABT_TIMEOUT_US 100000

	struct stm32_qspi_flash {
	u32 cr;
	u32 dcr;
	bool initialized;
	};

	struct stm32_qspi_priv {
	struct stm32_qspi_regs *regs;
	struct stm32_qspi_flash flash[STM32_QSPI_MAX_CHIP];
	void __iomem *mm_base;
	resource_size_t mm_size;
	ulong clock_rate;
	int cs_used;
	};

	static int _stm32_qspi_wait_for_not_busy(struct stm32_qspi_priv *priv)
	{
	u32 sr;
	int ret;

	ret = readl_poll_timeout(&priv->regs->sr, sr,
	!(sr & STM32_QSPI_SR_BUSY),
	STM32_BUSY_TIMEOUT_US);
	if (ret)
	log_err("busy timeout (stat:%#x)\n", sr);

	return ret;
	}

	static int _stm32_qspi_wait_cmd(struct stm32_qspi_priv *priv,
	const struct spi_mem_op *op)
	{
	u32 sr;
	int ret = 0;

	ret = readl_poll_timeout(&priv->regs->sr, sr,
	sr & STM32_QSPI_SR_TCF,
	STM32_QSPI_CMD_TIMEOUT_US);
	if (ret) {
	log_err("cmd timeout (stat:%#x)\n", sr);
	} else if (readl(&priv->regs->sr) & STM32_QSPI_SR_TEF) {
	log_err("transfer error (stat:%#x)\n", sr);
	ret = -EIO;
	}

	/* clear flags */
	writel(STM32_QSPI_FCR_CTCF \| STM32_QSPI_FCR_CTEF, &priv->regs->fcr);

	if (!ret)
	ret = _stm32_qspi_wait_for_not_busy(priv);

	return ret;
	}

	static void _stm32_qspi_read_fifo(u8 val, void __iomem addr)
	{
	*val = readb(addr);
	WATCHDOG_RESET();
	}

	static void _stm32_qspi_write_fifo(u8 val, void __iomem addr)
	{
	writeb(*val, addr);
	}

	static int _stm32_qspi_poll(struct stm32_qspi_priv *priv,
	const struct spi_mem_op *op)
	{
	void (fifo)(u8 val, void __iomem *addr);
	u32 len = op->data.nbytes, sr;
	u8 *buf;
	int ret;

	if (op->data.dir == SPI_MEM_DATA_IN) {
	fifo = _stm32_qspi_read_fifo;
	buf = op->data.buf.in;

	} else {
	fifo = _stm32_qspi_write_fifo;
	buf = (u8 *)op->data.buf.out;
	}

	while (len--) {
	ret = readl_poll_timeout(&priv->regs->sr, sr,
	sr & STM32_QSPI_SR_FTF,
	STM32_QSPI_FIFO_TIMEOUT_US);
	if (ret) {
	log_err("fifo timeout (len:%d stat:%#x)\n", len, sr);
	return ret;
	}

	fifo(buf++, &priv->regs->dr);
	}

	return 0;
	}

	static int stm32_qspi_mm(struct stm32_qspi_priv *priv,
	const struct spi_mem_op *op)
	{
	memcpy_fromio(op->data.buf.in, priv->mm_base + op->addr.val,
	op->data.nbytes);

	return 0;
	}

	static int _stm32_qspi_tx(struct stm32_qspi_priv *priv,
	const struct spi_mem_op *op,
	u8 mode)
	{
	if (!op->data.nbytes)
	return 0;

	if (mode == STM32_QSPI_CCR_MEM_MAP)
	return stm32_qspi_mm(priv, op);

	return _stm32_qspi_poll(priv, op);
	}

	static int _stm32_qspi_get_mode(u8 buswidth)
	{
	if (buswidth == 4)
	return 3;

	return buswidth;
	}

	static int stm32_qspi_exec_op(struct spi_slave *slave,
	const struct spi_mem_op *op)
	{
	struct stm32_qspi_priv *priv = dev_get_priv(slave->dev->parent);
	u32 cr, ccr, addr_max;
	u8 mode = STM32_QSPI_CCR_IND_WRITE;
	int timeout, ret;

	dev_dbg(slave->dev, "cmd:%#x mode:%d.%d.%d.%d addr:%#llx len:%#x\n",
	op->cmd.opcode, op->cmd.buswidth, op->addr.buswidth,
	op->dummy.buswidth, op->data.buswidth,
	op->addr.val, op->data.nbytes);

	addr_max = op->addr.val + op->data.nbytes + 1;

	if (op->data.dir == SPI_MEM_DATA_IN && op->data.nbytes) {
	if (addr_max < priv->mm_size && op->addr.buswidth)
	mode = STM32_QSPI_CCR_MEM_MAP;
	else
	mode = STM32_QSPI_CCR_IND_READ;
	}

	if (op->data.nbytes)
	writel(op->data.nbytes - 1, &priv->regs->dlr);

	ccr = (mode << STM32_QSPI_CCR_FMODE_SHIFT);
	ccr \|= op->cmd.opcode;
	ccr \|= (_stm32_qspi_get_mode(op->cmd.buswidth)
	<< STM32_QSPI_CCR_IMODE_SHIFT);

	if (op->addr.nbytes) {
	ccr \|= ((op->addr.nbytes - 1) << STM32_QSPI_CCR_ADSIZE_SHIFT);
	ccr \|= (_stm32_qspi_get_mode(op->addr.buswidth)
	<< STM32_QSPI_CCR_ADMODE_SHIFT);
	}

	if (op->dummy.buswidth && op->dummy.nbytes)
	ccr \|= (op->dummy.nbytes * 8 / op->dummy.buswidth
	<< STM32_QSPI_CCR_DCYC_SHIFT);

	if (op->data.nbytes)
	ccr \|= (_stm32_qspi_get_mode(op->data.buswidth)
	<< STM32_QSPI_CCR_DMODE_SHIFT);

	writel(ccr, &priv->regs->ccr);

	if (op->addr.nbytes && mode != STM32_QSPI_CCR_MEM_MAP)
	writel(op->addr.val, &priv->regs->ar);

	ret = _stm32_qspi_tx(priv, op, mode);
	/*
	* Abort in:
	* -error case
	* -read memory map: prefetching must be stopped if we read the last
	* byte of device (device size - fifo size). like device size is not
	* knows, the prefetching is always stop.
	*/
	if (ret \|\| mode == STM32_QSPI_CCR_MEM_MAP)
	goto abort;

	/* Wait end of tx in indirect mode */
	ret = _stm32_qspi_wait_cmd(priv, op);
	if (ret)
	goto abort;

	return 0;

	abort:
	setbits_le32(&priv->regs->cr, STM32_QSPI_CR_ABORT);

	/* Wait clear of abort bit by hw */
	timeout = readl_poll_timeout(&priv->regs->cr, cr,
	!(cr & STM32_QSPI_CR_ABORT),
	STM32_ABT_TIMEOUT_US);

	writel(STM32_QSPI_FCR_CTCF, &priv->regs->fcr);

	if (ret \|\| timeout)
	dev_err(slave->dev, "ret:%d abort timeout:%d\n", ret, timeout);

	return ret;
	}

	static int stm32_qspi_probe(struct udevice *bus)
	{
	struct stm32_qspi_priv *priv = dev_get_priv(bus);
	struct resource res;
	struct clk clk;
	struct reset_ctl reset_ctl;
	int ret;

	ret = dev_read_resource_byname(bus, "qspi", &res);
	if (ret) {
	dev_err(bus, "can't get regs base addresses(ret = %d)!\n", ret);
	return ret;
	}

	priv->regs = (struct stm32_qspi_regs *)res.start;

	ret = dev_read_resource_byname(bus, "qspi_mm", &res);
	if (ret) {
	dev_err(bus, "can't get mmap base address(ret = %d)!\n", ret);
	return ret;
	}

	priv->mm_base = (void __iomem *)res.start;

	priv->mm_size = resource_size(&res);
	if (priv->mm_size > STM32_QSPI_MAX_MMAP_SZ)
	return -EINVAL;

	dev_dbg(bus, "regs=<0x%p> mapped=<0x%p> mapped_size=<0x%lx>\n",
	priv->regs, priv->mm_base, priv->mm_size);

	ret = clk_get_by_index(bus, 0, &clk);
	if (ret < 0)
	return ret;

	ret = clk_enable(&clk);
	if (ret) {
	dev_err(bus, "failed to enable clock\n");
	return ret;
	}

	priv->clock_rate = clk_get_rate(&clk);
	if (!priv->clock_rate) {
	clk_disable(&clk);
	return -EINVAL;
	}

	ret = reset_get_by_index(bus, 0, &reset_ctl);
	if (ret) {
	if (ret != -ENOENT) {
	dev_err(bus, "failed to get reset\n");
	clk_disable(&clk);
	return ret;
	}
	} else {
	/* Reset QSPI controller */
	reset_assert(&reset_ctl);
	udelay(2);
	reset_deassert(&reset_ctl);
	}

	priv->cs_used = -1;

	setbits_le32(&priv->regs->cr, STM32_QSPI_CR_SSHIFT);

	/* Set dcr fsize to max address */
	setbits_le32(&priv->regs->dcr,
	STM32_QSPI_DCR_FSIZE_MASK << STM32_QSPI_DCR_FSIZE_SHIFT);

	return 0;
	}

	static int stm32_qspi_claim_bus(struct udevice *dev)
	{
	struct stm32_qspi_priv *priv = dev_get_priv(dev->parent);
	struct dm_spi_slave_plat *slave_plat = dev_get_parent_plat(dev);
	int slave_cs = slave_plat->cs;

	if (slave_cs >= STM32_QSPI_MAX_CHIP)
	return -ENODEV;

	if (priv->cs_used != slave_cs) {
	struct stm32_qspi_flash *flash = &priv->flash[slave_cs];

	priv->cs_used = slave_cs;

	if (flash->initialized) {
	/* Set the configuration: speed + cs */
	writel(flash->cr, &priv->regs->cr);
	writel(flash->dcr, &priv->regs->dcr);
	} else {
	/* Set chip select */
	clrsetbits_le32(&priv->regs->cr, STM32_QSPI_CR_FSEL,
	priv->cs_used ? STM32_QSPI_CR_FSEL : 0);

	/* Save the configuration: speed + cs */
	flash->cr = readl(&priv->regs->cr);
	flash->dcr = readl(&priv->regs->dcr);

	flash->initialized = true;
	}
	}

	setbits_le32(&priv->regs->cr, STM32_QSPI_CR_EN);

	return 0;
	}

	static int stm32_qspi_release_bus(struct udevice *dev)
	{
	struct stm32_qspi_priv *priv = dev_get_priv(dev->parent);

	clrbits_le32(&priv->regs->cr, STM32_QSPI_CR_EN);

	return 0;
	}

	static int stm32_qspi_set_speed(struct udevice *bus, uint speed)
	{
	struct stm32_qspi_priv *priv = dev_get_priv(bus);
	u32 qspi_clk = priv->clock_rate;
	u32 prescaler = 255;
	u32 csht;
	int ret;

	if (speed > 0) {
	prescaler = 0;
	if (qspi_clk) {
	prescaler = DIV_ROUND_UP(qspi_clk, speed) - 1;
	if (prescaler > 255)
	prescaler = 255;
	}
	}

	csht = DIV_ROUND_UP((5 * qspi_clk) / (prescaler + 1), 100000000);
	csht = (csht - 1) & STM32_QSPI_DCR_CSHT_MASK;

	ret = _stm32_qspi_wait_for_not_busy(priv);
	if (ret)
	return ret;

	clrsetbits_le32(&priv->regs->cr,
	STM32_QSPI_CR_PRESCALER_MASK <<
	STM32_QSPI_CR_PRESCALER_SHIFT,
	prescaler << STM32_QSPI_CR_PRESCALER_SHIFT);

	clrsetbits_le32(&priv->regs->dcr,
	STM32_QSPI_DCR_CSHT_MASK << STM32_QSPI_DCR_CSHT_SHIFT,
	csht << STM32_QSPI_DCR_CSHT_SHIFT);

	dev_dbg(bus, "regs=%p, speed=%d\n", priv->regs,
	(qspi_clk / (prescaler + 1)));

	return 0;
	}

	static int stm32_qspi_set_mode(struct udevice *bus, uint mode)
	{
	struct stm32_qspi_priv *priv = dev_get_priv(bus);
	int ret;
	const char str_rx, str_tx;

	ret = _stm32_qspi_wait_for_not_busy(priv);
	if (ret)
	return ret;

	if ((mode & SPI_CPHA) && (mode & SPI_CPOL))
	setbits_le32(&priv->regs->dcr, STM32_QSPI_DCR_CKMODE);
	else if (!(mode & SPI_CPHA) && !(mode & SPI_CPOL))
	clrbits_le32(&priv->regs->dcr, STM32_QSPI_DCR_CKMODE);
	else
	return -ENODEV;

	if (mode & SPI_CS_HIGH)
	return -ENODEV;

	if (mode & SPI_RX_QUAD)
	str_rx = "quad";
	else if (mode & SPI_RX_DUAL)
	str_rx = "dual";
	else
	str_rx = "single";

	if (mode & SPI_TX_QUAD)
	str_tx = "quad";
	else if (mode & SPI_TX_DUAL)
	str_tx = "dual";
	else
	str_tx = "single";

	dev_dbg(bus, "regs=%p, mode=%d rx: %s, tx: %s\n",
	priv->regs, mode, str_rx, str_tx);

	return 0;
	}

	static const struct spi_controller_mem_ops stm32_qspi_mem_ops = {
	.exec_op = stm32_qspi_exec_op,
	};

	static const struct dm_spi_ops stm32_qspi_ops = {
	.claim_bus = stm32_qspi_claim_bus,
	.release_bus = stm32_qspi_release_bus,
	.set_speed = stm32_qspi_set_speed,
	.set_mode = stm32_qspi_set_mode,
	.mem_ops = &stm32_qspi_mem_ops,
	};

	static const struct udevice_id stm32_qspi_ids[] = {
	{ .compatible = "st,stm32f469-qspi" },
	{ }
	};

	U_BOOT_DRIVER(stm32_qspi) = {
	.name = "stm32_qspi",
	.id = UCLASS_SPI,
	.of_match = stm32_qspi_ids,
	.ops = &stm32_qspi_ops,
	.priv_auto = sizeof(struct stm32_qspi_priv),
	.probe = stm32_qspi_probe,
	};