drivers/spi/bcm63xx_hsspi.c - platform/external/u-boot - Gitiles

 // SPDX-License-Identifier: GPL-2.0+
 /*
  * Copyright (C) 2017 Álvaro Fernández Rojas <noltari@gmail.com>
  *
  * Derived from linux/drivers/spi/spi-bcm63xx-hsspi.c:
  *	Copyright (C) 2000-2010 Broadcom Corporation
  *	Copyright (C) 2012-2013 Jonas Gorski <jogo@openwrt.org>
  */

 #include <common.h>
 #include <clk.h>
 #include <dm.h>
 #include <spi.h>
 #include <reset.h>
 #include <wait_bit.h>
 #include <asm/io.h>

 #define HSSPI_PP			0

 #define SPI_MAX_SYNC_CLOCK		30000000

 /* SPI Control register */
 #define SPI_CTL_REG			0x000
 #define SPI_CTL_CS_POL_SHIFT		0
 #define SPI_CTL_CS_POL_MASK		(0xff << SPI_CTL_CS_POL_SHIFT)
 #define SPI_CTL_CLK_GATE_SHIFT		16
 #define SPI_CTL_CLK_GATE_MASK		(1 << SPI_CTL_CLK_GATE_SHIFT)
 #define SPI_CTL_CLK_POL_SHIFT		17
 #define SPI_CTL_CLK_POL_MASK		(1 << SPI_CTL_CLK_POL_SHIFT)

 /* SPI Interrupts registers */
 #define SPI_IR_STAT_REG			0x008
 #define SPI_IR_ST_MASK_REG		0x00c
 #define SPI_IR_MASK_REG			0x010

 #define SPI_IR_CLEAR_ALL		0xff001f1f

 /* SPI Ping-Pong Command registers */
 #define SPI_CMD_REG			(0x080 + (0x40 * (HSSPI_PP)) + 0x00)
 #define SPI_CMD_OP_SHIFT		0
 #define SPI_CMD_OP_START		(0x1 << SPI_CMD_OP_SHIFT)
 #define SPI_CMD_PFL_SHIFT		8
 #define SPI_CMD_PFL_MASK		(0x7 << SPI_CMD_PFL_SHIFT)
 #define SPI_CMD_SLAVE_SHIFT		12
 #define SPI_CMD_SLAVE_MASK		(0x7 << SPI_CMD_SLAVE_SHIFT)

 /* SPI Ping-Pong Status registers */
 #define SPI_STAT_REG			(0x080 + (0x40 * (HSSPI_PP)) + 0x04)
 #define SPI_STAT_SRCBUSY_SHIFT		1
 #define SPI_STAT_SRCBUSY_MASK		(1 << SPI_STAT_SRCBUSY_SHIFT)

 /* SPI Profile Clock registers */
 #define SPI_PFL_CLK_REG(x)		(0x100 + (0x20 * (x)) + 0x00)
 #define SPI_PFL_CLK_FREQ_SHIFT		0
 #define SPI_PFL_CLK_FREQ_MASK		(0x3fff << SPI_PFL_CLK_FREQ_SHIFT)
 #define SPI_PFL_CLK_RSTLOOP_SHIFT	15
 #define SPI_PFL_CLK_RSTLOOP_MASK	(1 << SPI_PFL_CLK_RSTLOOP_SHIFT)

 /* SPI Profile Signal registers */
 #define SPI_PFL_SIG_REG(x)		(0x100 + (0x20 * (x)) + 0x04)
 #define SPI_PFL_SIG_LATCHRIS_SHIFT	12
 #define SPI_PFL_SIG_LATCHRIS_MASK	(1 << SPI_PFL_SIG_LATCHRIS_SHIFT)
 #define SPI_PFL_SIG_LAUNCHRIS_SHIFT	13
 #define SPI_PFL_SIG_LAUNCHRIS_MASK	(1 << SPI_PFL_SIG_LAUNCHRIS_SHIFT)
 #define SPI_PFL_SIG_ASYNCIN_SHIFT	16
 #define SPI_PFL_SIG_ASYNCIN_MASK	(1 << SPI_PFL_SIG_ASYNCIN_SHIFT)

 /* SPI Profile Mode registers */
 #define SPI_PFL_MODE_REG(x)		(0x100 + (0x20 * (x)) + 0x08)
 #define SPI_PFL_MODE_FILL_SHIFT		0
 #define SPI_PFL_MODE_FILL_MASK		(0xff << SPI_PFL_MODE_FILL_SHIFT)
 #define SPI_PFL_MODE_MDRDSZ_SHIFT	16
 #define SPI_PFL_MODE_MDRDSZ_MASK	(1 << SPI_PFL_MODE_MDRDSZ_SHIFT)
 #define SPI_PFL_MODE_MDWRSZ_SHIFT	18
 #define SPI_PFL_MODE_MDWRSZ_MASK	(1 << SPI_PFL_MODE_MDWRSZ_SHIFT)
 #define SPI_PFL_MODE_3WIRE_SHIFT	20
 #define SPI_PFL_MODE_3WIRE_MASK		(1 << SPI_PFL_MODE_3WIRE_SHIFT)

 /* SPI Ping-Pong FIFO registers */
 #define HSSPI_FIFO_SIZE			0x200
 #define HSSPI_FIFO_BASE			(0x200 + \
 					 (HSSPI_FIFO_SIZE * HSSPI_PP))

 /* SPI Ping-Pong FIFO OP register */
 #define HSSPI_FIFO_OP_SIZE		0x2
 #define HSSPI_FIFO_OP_REG		(HSSPI_FIFO_BASE + 0x00)
 #define HSSPI_FIFO_OP_BYTES_SHIFT	0
 #define HSSPI_FIFO_OP_BYTES_MASK	(0x3ff << HSSPI_FIFO_OP_BYTES_SHIFT)
 #define HSSPI_FIFO_OP_MBIT_SHIFT	11
 #define HSSPI_FIFO_OP_MBIT_MASK		(1 << HSSPI_FIFO_OP_MBIT_SHIFT)
 #define HSSPI_FIFO_OP_CODE_SHIFT	13
 #define HSSPI_FIFO_OP_READ_WRITE	(1 << HSSPI_FIFO_OP_CODE_SHIFT)
 #define HSSPI_FIFO_OP_CODE_W		(2 << HSSPI_FIFO_OP_CODE_SHIFT)
 #define HSSPI_FIFO_OP_CODE_R		(3 << HSSPI_FIFO_OP_CODE_SHIFT)

 struct bcm63xx_hsspi_priv {
 	void __iomem *regs;
 	ulong clk_rate;
 	uint8_t num_cs;
 	uint8_t cs_pols;
 	uint speed;
 };

 static int bcm63xx_hsspi_cs_info(struct udevice *bus, uint cs,
 			   struct spi_cs_info *info)
 {
 	struct bcm63xx_hsspi_priv *priv = dev_get_priv(bus);

 	if (cs >= priv->num_cs) {
 		printf("no cs %u\n", cs);
 		return -ENODEV;
 	}

 	return 0;
 }

 static int bcm63xx_hsspi_set_mode(struct udevice *bus, uint mode)
 {
 	struct bcm63xx_hsspi_priv *priv = dev_get_priv(bus);

 	/* clock polarity */
 	if (mode & SPI_CPOL)
 		setbits_32(priv->regs + SPI_CTL_REG, SPI_CTL_CLK_POL_MASK);
 	else
 		clrbits_32(priv->regs + SPI_CTL_REG, SPI_CTL_CLK_POL_MASK);

 	return 0;
 }

 static int bcm63xx_hsspi_set_speed(struct udevice *bus, uint speed)
 {
 	struct bcm63xx_hsspi_priv *priv = dev_get_priv(bus);

 	priv->speed = speed;

 	return 0;
 }

 static void bcm63xx_hsspi_activate_cs(struct bcm63xx_hsspi_priv *priv,
 				   struct dm_spi_slave_platdata *plat)
 {
 	uint32_t clr, set;

 	/* profile clock */
 	set = DIV_ROUND_UP(priv->clk_rate, priv->speed);
 	set = DIV_ROUND_UP(2048, set);
 	set &= SPI_PFL_CLK_FREQ_MASK;
 	set |= SPI_PFL_CLK_RSTLOOP_MASK;
 	writel(set, priv->regs + SPI_PFL_CLK_REG(plat->cs));

 	/* profile signal */
 	set = 0;
 	clr = SPI_PFL_SIG_LAUNCHRIS_MASK |
 	      SPI_PFL_SIG_LATCHRIS_MASK |
 	      SPI_PFL_SIG_ASYNCIN_MASK;

 	/* latch/launch config */
 	if (plat->mode & SPI_CPHA)
 		set |= SPI_PFL_SIG_LAUNCHRIS_MASK;
 	else
 		set |= SPI_PFL_SIG_LATCHRIS_MASK;

 	/* async clk */
 	if (priv->speed > SPI_MAX_SYNC_CLOCK)
 		set |= SPI_PFL_SIG_ASYNCIN_MASK;

 	clrsetbits_32(priv->regs + SPI_PFL_SIG_REG(plat->cs), clr, set);

 	/* global control */
 	set = 0;
 	clr = 0;

 	/* invert cs polarity */
 	if (priv->cs_pols & BIT(plat->cs))
 		clr |= BIT(plat->cs);
 	else
 		set |= BIT(plat->cs);

 	/* invert dummy cs polarity */
 	if (priv->cs_pols & BIT(!plat->cs))
 		clr |= BIT(!plat->cs);
 	else
 		set |= BIT(!plat->cs);

 	clrsetbits_32(priv->regs + SPI_CTL_REG, clr, set);
 }

 static void bcm63xx_hsspi_deactivate_cs(struct bcm63xx_hsspi_priv *priv)
 {
 	/* restore cs polarities */
 	clrsetbits_32(priv->regs + SPI_CTL_REG, SPI_CTL_CS_POL_MASK,
 			priv->cs_pols);
 }

 /*
  * BCM63xx HSSPI driver doesn't allow keeping CS active between transfers
  * because they are controlled by HW.
  * However, it provides a mechanism to prepend write transfers prior to read
  * transfers (with a maximum prepend of 15 bytes), which is usually enough for
  * SPI-connected flashes since reading requires prepending a write transfer of
  * 5 bytes. On the other hand it also provides a way to invert each CS
  * polarity, not only between transfers like the older BCM63xx SPI driver, but
  * also the rest of the time.
  *
  * Instead of using the prepend mechanism, this implementation inverts the
  * polarity of both the desired CS and another dummy CS when the bus is
  * claimed. This way, the dummy CS is restored to its inactive value when
  * transfers are issued and the desired CS is preserved in its active value
  * all the time. This hack is also used in the upstream linux driver and
  * allows keeping CS active between trasnfers even if the HW doesn't give
  * this possibility.
  */
 static int bcm63xx_hsspi_xfer(struct udevice *dev, unsigned int bitlen,
 		const void *dout, void *din, unsigned long flags)
 {
 	struct bcm63xx_hsspi_priv *priv = dev_get_priv(dev->parent);
 	struct dm_spi_slave_platdata *plat = dev_get_parent_platdata(dev);
 	size_t data_bytes = bitlen / 8;
 	size_t step_size = HSSPI_FIFO_SIZE;
 	uint16_t opcode = 0;
 	uint32_t val;
 	const uint8_t *tx = dout;
 	uint8_t *rx = din;

 	if (flags & SPI_XFER_BEGIN)
 		bcm63xx_hsspi_activate_cs(priv, plat);

 	/* fifo operation */
 	if (tx && rx)
 		opcode = HSSPI_FIFO_OP_READ_WRITE;
 	else if (rx)
 		opcode = HSSPI_FIFO_OP_CODE_R;
 	else if (tx)
 		opcode = HSSPI_FIFO_OP_CODE_W;

 	if (opcode != HSSPI_FIFO_OP_CODE_R)
 		step_size -= HSSPI_FIFO_OP_SIZE;

 	/* dual mode */
 	if ((opcode == HSSPI_FIFO_OP_CODE_R && plat->mode == SPI_RX_DUAL) ||
 	    (opcode == HSSPI_FIFO_OP_CODE_W && plat->mode == SPI_TX_DUAL))
 		opcode |= HSSPI_FIFO_OP_MBIT_MASK;

 	/* profile mode */
 	val = SPI_PFL_MODE_FILL_MASK |
 	      SPI_PFL_MODE_MDRDSZ_MASK |
 	      SPI_PFL_MODE_MDWRSZ_MASK;
 	if (plat->mode & SPI_3WIRE)
 		val |= SPI_PFL_MODE_3WIRE_MASK;
 	writel(val, priv->regs + SPI_PFL_MODE_REG(plat->cs));

 	/* transfer loop */
 	while (data_bytes > 0) {
 		size_t curr_step = min(step_size, data_bytes);
 		int ret;

 		/* copy tx data */
 		if (tx) {
 			memcpy_toio(priv->regs + HSSPI_FIFO_BASE +
 				    HSSPI_FIFO_OP_SIZE, tx, curr_step);
 			tx += curr_step;
 		}

 		/* set fifo operation */
 		writew(cpu_to_be16(opcode | (curr_step & HSSPI_FIFO_OP_BYTES_MASK)),
 			  priv->regs + HSSPI_FIFO_OP_REG);

 		/* issue the transfer */
 		val = SPI_CMD_OP_START;
 		val |= (plat->cs << SPI_CMD_PFL_SHIFT) &
 		       SPI_CMD_PFL_MASK;
 		val |= (!plat->cs << SPI_CMD_SLAVE_SHIFT) &
 		       SPI_CMD_SLAVE_MASK;
 		writel(val, priv->regs + SPI_CMD_REG);

 		/* wait for completion */
 		ret = wait_for_bit_32(priv->regs + SPI_STAT_REG,
 					SPI_STAT_SRCBUSY_MASK, false,
 					1000, false);
 		if (ret) {
 			printf("interrupt timeout\n");
 			return ret;
 		}

 		/* copy rx data */
 		if (rx) {
 			memcpy_fromio(rx, priv->regs + HSSPI_FIFO_BASE,
 				      curr_step);
 			rx += curr_step;
 		}

 		data_bytes -= curr_step;
 	}

 	if (flags & SPI_XFER_END)
 		bcm63xx_hsspi_deactivate_cs(priv);

 	return 0;
 }

 static const struct dm_spi_ops bcm63xx_hsspi_ops = {
 	.cs_info = bcm63xx_hsspi_cs_info,
 	.set_mode = bcm63xx_hsspi_set_mode,
 	.set_speed = bcm63xx_hsspi_set_speed,
 	.xfer = bcm63xx_hsspi_xfer,
 };

 static const struct udevice_id bcm63xx_hsspi_ids[] = {
 	{ .compatible = "brcm,bcm6328-hsspi", },
 	{ /* sentinel */ }
 };

 static int bcm63xx_hsspi_child_pre_probe(struct udevice *dev)
 {
 	struct bcm63xx_hsspi_priv *priv = dev_get_priv(dev->parent);
 	struct dm_spi_slave_platdata *plat = dev_get_parent_platdata(dev);

 	/* check cs */
 	if (plat->cs >= priv->num_cs) {
 		printf("no cs %u\n", plat->cs);
 		return -ENODEV;
 	}

 	/* cs polarity */
 	if (plat->mode & SPI_CS_HIGH)
 		priv->cs_pols |= BIT(plat->cs);
 	else
 		priv->cs_pols &= ~BIT(plat->cs);

 	return 0;
 }

 static int bcm63xx_hsspi_probe(struct udevice *dev)
 {
 	struct bcm63xx_hsspi_priv *priv = dev_get_priv(dev);
 	struct reset_ctl rst_ctl;
 	struct clk clk;
 	int ret;

 	priv->regs = dev_remap_addr(dev);
 	if (!priv->regs)
 		return -EINVAL;

 	priv->num_cs = dev_read_u32_default(dev, "num-cs", 8);

 	/* enable clock */
 	ret = clk_get_by_name(dev, "hsspi", &clk);
 	if (ret < 0)
 		return ret;

 	ret = clk_enable(&clk);
 	if (ret < 0)
 		return ret;

 	ret = clk_free(&clk);
 	if (ret < 0)
 		return ret;

 	/* get clock rate */
 	ret = clk_get_by_name(dev, "pll", &clk);
 	if (ret < 0)
 		return ret;

 	priv->clk_rate = clk_get_rate(&clk);

 	ret = clk_free(&clk);
 	if (ret < 0)
 		return ret;

 	/* perform reset */
 	ret = reset_get_by_index(dev, 0, &rst_ctl);
 	if (ret < 0)
 		return ret;

 	ret = reset_deassert(&rst_ctl);
 	if (ret < 0)
 		return ret;

 	ret = reset_free(&rst_ctl);
 	if (ret < 0)
 		return ret;

 	/* initialize hardware */
 	writel(0, priv->regs + SPI_IR_MASK_REG);

 	/* clear pending interrupts */
 	writel(SPI_IR_CLEAR_ALL, priv->regs + SPI_IR_STAT_REG);

 	/* enable clk gate */
 	setbits_32(priv->regs + SPI_CTL_REG, SPI_CTL_CLK_GATE_MASK);

 	/* read default cs polarities */
 	priv->cs_pols = readl(priv->regs + SPI_CTL_REG) &
 			SPI_CTL_CS_POL_MASK;

 	return 0;
 }

 U_BOOT_DRIVER(bcm63xx_hsspi) = {
 	.name = "bcm63xx_hsspi",
 	.id = UCLASS_SPI,
 	.of_match = bcm63xx_hsspi_ids,
 	.ops = &bcm63xx_hsspi_ops,
 	.priv_auto_alloc_size = sizeof(struct bcm63xx_hsspi_priv),
 	.child_pre_probe = bcm63xx_hsspi_child_pre_probe,
 	.probe = bcm63xx_hsspi_probe,
 };
	// SPDX-License-Identifier: GPL-2.0+
	/*
	* Copyright (C) 2017 Álvaro Fernández Rojas <noltari@gmail.com>
	*
	* Derived from linux/drivers/spi/spi-bcm63xx-hsspi.c:
	* Copyright (C) 2000-2010 Broadcom Corporation
	* Copyright (C) 2012-2013 Jonas Gorski <jogo@openwrt.org>
	*/

	#include <common.h>
	#include <clk.h>
	#include <dm.h>
	#include <spi.h>
	#include <reset.h>
	#include <wait_bit.h>
	#include <asm/io.h>

	#define HSSPI_PP 0

	#define SPI_MAX_SYNC_CLOCK 30000000

	/* SPI Control register */
	#define SPI_CTL_REG 0x000
	#define SPI_CTL_CS_POL_SHIFT 0
	#define SPI_CTL_CS_POL_MASK (0xff << SPI_CTL_CS_POL_SHIFT)
	#define SPI_CTL_CLK_GATE_SHIFT 16
	#define SPI_CTL_CLK_GATE_MASK (1 << SPI_CTL_CLK_GATE_SHIFT)
	#define SPI_CTL_CLK_POL_SHIFT 17
	#define SPI_CTL_CLK_POL_MASK (1 << SPI_CTL_CLK_POL_SHIFT)

	/* SPI Interrupts registers */
	#define SPI_IR_STAT_REG 0x008
	#define SPI_IR_ST_MASK_REG 0x00c
	#define SPI_IR_MASK_REG 0x010

	#define SPI_IR_CLEAR_ALL 0xff001f1f

	/* SPI Ping-Pong Command registers */
	#define SPI_CMD_REG (0x080 + (0x40 * (HSSPI_PP)) + 0x00)
	#define SPI_CMD_OP_SHIFT 0
	#define SPI_CMD_OP_START (0x1 << SPI_CMD_OP_SHIFT)
	#define SPI_CMD_PFL_SHIFT 8
	#define SPI_CMD_PFL_MASK (0x7 << SPI_CMD_PFL_SHIFT)
	#define SPI_CMD_SLAVE_SHIFT 12
	#define SPI_CMD_SLAVE_MASK (0x7 << SPI_CMD_SLAVE_SHIFT)

	/* SPI Ping-Pong Status registers */
	#define SPI_STAT_REG (0x080 + (0x40 * (HSSPI_PP)) + 0x04)
	#define SPI_STAT_SRCBUSY_SHIFT 1
	#define SPI_STAT_SRCBUSY_MASK (1 << SPI_STAT_SRCBUSY_SHIFT)

	/* SPI Profile Clock registers */
	#define SPI_PFL_CLK_REG(x) (0x100 + (0x20 * (x)) + 0x00)
	#define SPI_PFL_CLK_FREQ_SHIFT 0
	#define SPI_PFL_CLK_FREQ_MASK (0x3fff << SPI_PFL_CLK_FREQ_SHIFT)
	#define SPI_PFL_CLK_RSTLOOP_SHIFT 15
	#define SPI_PFL_CLK_RSTLOOP_MASK (1 << SPI_PFL_CLK_RSTLOOP_SHIFT)

	/* SPI Profile Signal registers */
	#define SPI_PFL_SIG_REG(x) (0x100 + (0x20 * (x)) + 0x04)
	#define SPI_PFL_SIG_LATCHRIS_SHIFT 12
	#define SPI_PFL_SIG_LATCHRIS_MASK (1 << SPI_PFL_SIG_LATCHRIS_SHIFT)
	#define SPI_PFL_SIG_LAUNCHRIS_SHIFT 13
	#define SPI_PFL_SIG_LAUNCHRIS_MASK (1 << SPI_PFL_SIG_LAUNCHRIS_SHIFT)
	#define SPI_PFL_SIG_ASYNCIN_SHIFT 16
	#define SPI_PFL_SIG_ASYNCIN_MASK (1 << SPI_PFL_SIG_ASYNCIN_SHIFT)

	/* SPI Profile Mode registers */
	#define SPI_PFL_MODE_REG(x) (0x100 + (0x20 * (x)) + 0x08)
	#define SPI_PFL_MODE_FILL_SHIFT 0
	#define SPI_PFL_MODE_FILL_MASK (0xff << SPI_PFL_MODE_FILL_SHIFT)
	#define SPI_PFL_MODE_MDRDSZ_SHIFT 16
	#define SPI_PFL_MODE_MDRDSZ_MASK (1 << SPI_PFL_MODE_MDRDSZ_SHIFT)
	#define SPI_PFL_MODE_MDWRSZ_SHIFT 18
	#define SPI_PFL_MODE_MDWRSZ_MASK (1 << SPI_PFL_MODE_MDWRSZ_SHIFT)
	#define SPI_PFL_MODE_3WIRE_SHIFT 20
	#define SPI_PFL_MODE_3WIRE_MASK (1 << SPI_PFL_MODE_3WIRE_SHIFT)

	/* SPI Ping-Pong FIFO registers */
	#define HSSPI_FIFO_SIZE 0x200
	#define HSSPI_FIFO_BASE (0x200 + \
	(HSSPI_FIFO_SIZE * HSSPI_PP))

	/* SPI Ping-Pong FIFO OP register */
	#define HSSPI_FIFO_OP_SIZE 0x2
	#define HSSPI_FIFO_OP_REG (HSSPI_FIFO_BASE + 0x00)
	#define HSSPI_FIFO_OP_BYTES_SHIFT 0
	#define HSSPI_FIFO_OP_BYTES_MASK (0x3ff << HSSPI_FIFO_OP_BYTES_SHIFT)
	#define HSSPI_FIFO_OP_MBIT_SHIFT 11
	#define HSSPI_FIFO_OP_MBIT_MASK (1 << HSSPI_FIFO_OP_MBIT_SHIFT)
	#define HSSPI_FIFO_OP_CODE_SHIFT 13
	#define HSSPI_FIFO_OP_READ_WRITE (1 << HSSPI_FIFO_OP_CODE_SHIFT)
	#define HSSPI_FIFO_OP_CODE_W (2 << HSSPI_FIFO_OP_CODE_SHIFT)
	#define HSSPI_FIFO_OP_CODE_R (3 << HSSPI_FIFO_OP_CODE_SHIFT)

	struct bcm63xx_hsspi_priv {
	void __iomem *regs;
	ulong clk_rate;
	uint8_t num_cs;
	uint8_t cs_pols;
	uint speed;
	};

	static int bcm63xx_hsspi_cs_info(struct udevice *bus, uint cs,
	struct spi_cs_info *info)
	{
	struct bcm63xx_hsspi_priv *priv = dev_get_priv(bus);

	if (cs >= priv->num_cs) {
	printf("no cs %u\n", cs);
	return -ENODEV;
	}

	return 0;
	}

	static int bcm63xx_hsspi_set_mode(struct udevice *bus, uint mode)
	{
	struct bcm63xx_hsspi_priv *priv = dev_get_priv(bus);

	/* clock polarity */
	if (mode & SPI_CPOL)
	setbits_32(priv->regs + SPI_CTL_REG, SPI_CTL_CLK_POL_MASK);
	else
	clrbits_32(priv->regs + SPI_CTL_REG, SPI_CTL_CLK_POL_MASK);

	return 0;
	}

	static int bcm63xx_hsspi_set_speed(struct udevice *bus, uint speed)
	{
	struct bcm63xx_hsspi_priv *priv = dev_get_priv(bus);

	priv->speed = speed;

	return 0;
	}

	static void bcm63xx_hsspi_activate_cs(struct bcm63xx_hsspi_priv *priv,
	struct dm_spi_slave_platdata *plat)
	{
	uint32_t clr, set;

	/* profile clock */
	set = DIV_ROUND_UP(priv->clk_rate, priv->speed);
	set = DIV_ROUND_UP(2048, set);
	set &= SPI_PFL_CLK_FREQ_MASK;
	set \|= SPI_PFL_CLK_RSTLOOP_MASK;
	writel(set, priv->regs + SPI_PFL_CLK_REG(plat->cs));

	/* profile signal */
	set = 0;
	clr = SPI_PFL_SIG_LAUNCHRIS_MASK \|
	SPI_PFL_SIG_LATCHRIS_MASK \|
	SPI_PFL_SIG_ASYNCIN_MASK;

	/* latch/launch config */
	if (plat->mode & SPI_CPHA)
	set \|= SPI_PFL_SIG_LAUNCHRIS_MASK;
	else
	set \|= SPI_PFL_SIG_LATCHRIS_MASK;

	/* async clk */
	if (priv->speed > SPI_MAX_SYNC_CLOCK)
	set \|= SPI_PFL_SIG_ASYNCIN_MASK;

	clrsetbits_32(priv->regs + SPI_PFL_SIG_REG(plat->cs), clr, set);

	/* global control */
	set = 0;
	clr = 0;

	/* invert cs polarity */
	if (priv->cs_pols & BIT(plat->cs))
	clr \|= BIT(plat->cs);
	else
	set \|= BIT(plat->cs);

	/* invert dummy cs polarity */
	if (priv->cs_pols & BIT(!plat->cs))
	clr \|= BIT(!plat->cs);
	else
	set \|= BIT(!plat->cs);

	clrsetbits_32(priv->regs + SPI_CTL_REG, clr, set);
	}

	static void bcm63xx_hsspi_deactivate_cs(struct bcm63xx_hsspi_priv *priv)
	{
	/* restore cs polarities */
	clrsetbits_32(priv->regs + SPI_CTL_REG, SPI_CTL_CS_POL_MASK,
	priv->cs_pols);
	}

	/*
	* BCM63xx HSSPI driver doesn't allow keeping CS active between transfers
	* because they are controlled by HW.
	* However, it provides a mechanism to prepend write transfers prior to read
	* transfers (with a maximum prepend of 15 bytes), which is usually enough for
	* SPI-connected flashes since reading requires prepending a write transfer of
	* 5 bytes. On the other hand it also provides a way to invert each CS
	* polarity, not only between transfers like the older BCM63xx SPI driver, but
	* also the rest of the time.
	*
	* Instead of using the prepend mechanism, this implementation inverts the
	* polarity of both the desired CS and another dummy CS when the bus is
	* claimed. This way, the dummy CS is restored to its inactive value when
	* transfers are issued and the desired CS is preserved in its active value
	* all the time. This hack is also used in the upstream linux driver and
	* allows keeping CS active between trasnfers even if the HW doesn't give
	* this possibility.
	*/
	static int bcm63xx_hsspi_xfer(struct udevice *dev, unsigned int bitlen,
	const void dout, void din, unsigned long flags)
	{
	struct bcm63xx_hsspi_priv *priv = dev_get_priv(dev->parent);
	struct dm_spi_slave_platdata *plat = dev_get_parent_platdata(dev);
	size_t data_bytes = bitlen / 8;
	size_t step_size = HSSPI_FIFO_SIZE;
	uint16_t opcode = 0;
	uint32_t val;
	const uint8_t *tx = dout;
	uint8_t *rx = din;

	if (flags & SPI_XFER_BEGIN)
	bcm63xx_hsspi_activate_cs(priv, plat);

	/* fifo operation */
	if (tx && rx)
	opcode = HSSPI_FIFO_OP_READ_WRITE;
	else if (rx)
	opcode = HSSPI_FIFO_OP_CODE_R;
	else if (tx)
	opcode = HSSPI_FIFO_OP_CODE_W;

	if (opcode != HSSPI_FIFO_OP_CODE_R)
	step_size -= HSSPI_FIFO_OP_SIZE;

	/* dual mode */
	if ((opcode == HSSPI_FIFO_OP_CODE_R && plat->mode == SPI_RX_DUAL) \|\|
	(opcode == HSSPI_FIFO_OP_CODE_W && plat->mode == SPI_TX_DUAL))
	opcode \|= HSSPI_FIFO_OP_MBIT_MASK;

	/* profile mode */
	val = SPI_PFL_MODE_FILL_MASK \|
	SPI_PFL_MODE_MDRDSZ_MASK \|
	SPI_PFL_MODE_MDWRSZ_MASK;
	if (plat->mode & SPI_3WIRE)
	val \|= SPI_PFL_MODE_3WIRE_MASK;
	writel(val, priv->regs + SPI_PFL_MODE_REG(plat->cs));

	/* transfer loop */
	while (data_bytes > 0) {
	size_t curr_step = min(step_size, data_bytes);
	int ret;

	/* copy tx data */
	if (tx) {
	memcpy_toio(priv->regs + HSSPI_FIFO_BASE +
	HSSPI_FIFO_OP_SIZE, tx, curr_step);
	tx += curr_step;
	}

	/* set fifo operation */
	writew(cpu_to_be16(opcode \| (curr_step & HSSPI_FIFO_OP_BYTES_MASK)),
	priv->regs + HSSPI_FIFO_OP_REG);

	/* issue the transfer */
	val = SPI_CMD_OP_START;
	val \|= (plat->cs << SPI_CMD_PFL_SHIFT) &
	SPI_CMD_PFL_MASK;
	val \|= (!plat->cs << SPI_CMD_SLAVE_SHIFT) &
	SPI_CMD_SLAVE_MASK;
	writel(val, priv->regs + SPI_CMD_REG);

	/* wait for completion */
	ret = wait_for_bit_32(priv->regs + SPI_STAT_REG,
	SPI_STAT_SRCBUSY_MASK, false,
	1000, false);
	if (ret) {
	printf("interrupt timeout\n");
	return ret;
	}

	/* copy rx data */
	if (rx) {
	memcpy_fromio(rx, priv->regs + HSSPI_FIFO_BASE,
	curr_step);
	rx += curr_step;
	}

	data_bytes -= curr_step;
	}

	if (flags & SPI_XFER_END)
	bcm63xx_hsspi_deactivate_cs(priv);

	return 0;
	}

	static const struct dm_spi_ops bcm63xx_hsspi_ops = {
	.cs_info = bcm63xx_hsspi_cs_info,
	.set_mode = bcm63xx_hsspi_set_mode,
	.set_speed = bcm63xx_hsspi_set_speed,
	.xfer = bcm63xx_hsspi_xfer,
	};

	static const struct udevice_id bcm63xx_hsspi_ids[] = {
	{ .compatible = "brcm,bcm6328-hsspi", },
	{ /* sentinel */ }
	};

	static int bcm63xx_hsspi_child_pre_probe(struct udevice *dev)
	{
	struct bcm63xx_hsspi_priv *priv = dev_get_priv(dev->parent);
	struct dm_spi_slave_platdata *plat = dev_get_parent_platdata(dev);

	/* check cs */
	if (plat->cs >= priv->num_cs) {
	printf("no cs %u\n", plat->cs);
	return -ENODEV;
	}

	/* cs polarity */
	if (plat->mode & SPI_CS_HIGH)
	priv->cs_pols \|= BIT(plat->cs);
	else
	priv->cs_pols &= ~BIT(plat->cs);

	return 0;
	}

	static int bcm63xx_hsspi_probe(struct udevice *dev)
	{
	struct bcm63xx_hsspi_priv *priv = dev_get_priv(dev);
	struct reset_ctl rst_ctl;
	struct clk clk;
	int ret;

	priv->regs = dev_remap_addr(dev);
	if (!priv->regs)
	return -EINVAL;

	priv->num_cs = dev_read_u32_default(dev, "num-cs", 8);

	/* enable clock */
	ret = clk_get_by_name(dev, "hsspi", &clk);
	if (ret < 0)
	return ret;

	ret = clk_enable(&clk);
	if (ret < 0)
	return ret;

	ret = clk_free(&clk);
	if (ret < 0)
	return ret;

	/* get clock rate */
	ret = clk_get_by_name(dev, "pll", &clk);
	if (ret < 0)
	return ret;

	priv->clk_rate = clk_get_rate(&clk);

	ret = clk_free(&clk);
	if (ret < 0)
	return ret;

	/* perform reset */
	ret = reset_get_by_index(dev, 0, &rst_ctl);
	if (ret < 0)
	return ret;

	ret = reset_deassert(&rst_ctl);
	if (ret < 0)
	return ret;

	ret = reset_free(&rst_ctl);
	if (ret < 0)
	return ret;

	/* initialize hardware */
	writel(0, priv->regs + SPI_IR_MASK_REG);

	/* clear pending interrupts */
	writel(SPI_IR_CLEAR_ALL, priv->regs + SPI_IR_STAT_REG);

	/* enable clk gate */
	setbits_32(priv->regs + SPI_CTL_REG, SPI_CTL_CLK_GATE_MASK);

	/* read default cs polarities */
	priv->cs_pols = readl(priv->regs + SPI_CTL_REG) &
	SPI_CTL_CS_POL_MASK;

	return 0;
	}

	U_BOOT_DRIVER(bcm63xx_hsspi) = {
	.name = "bcm63xx_hsspi",
	.id = UCLASS_SPI,
	.of_match = bcm63xx_hsspi_ids,
	.ops = &bcm63xx_hsspi_ops,
	.priv_auto_alloc_size = sizeof(struct bcm63xx_hsspi_priv),
	.child_pre_probe = bcm63xx_hsspi_child_pre_probe,
	.probe = bcm63xx_hsspi_probe,
	};