drivers/spi/bcmbca_hsspi.c - filogic/uboot - 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>
  *	Copyright (C) 2021 Broadcom Ltd
  */

 #include <common.h>
 #include <asm/io.h>
 #include <clk.h>
 #include <spi.h>
 #include <reset.h>
 #include <wait_bit.h>
 #include <dm.h>
 #include <dm/device_compat.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		BIT(SPI_CTL_CLK_GATE_SHIFT)
 #define SPI_CTL_CLK_POL_SHIFT		17
 #define SPI_CTL_CLK_POL_MASK		BIT(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		BIT(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		BIT(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	BIT(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	BIT(SPI_PFL_SIG_LATCHRIS_SHIFT)
 #define SPI_PFL_SIG_LAUNCHRIS_SHIFT	13
 #define SPI_PFL_SIG_LAUNCHRIS_MASK	BIT(SPI_PFL_SIG_LAUNCHRIS_SHIFT)
 #define SPI_PFL_SIG_ASYNCIN_SHIFT	16
 #define SPI_PFL_SIG_ASYNCIN_MASK	BIT(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	BIT(SPI_PFL_MODE_MDRDSZ_SHIFT)
 #define SPI_PFL_MODE_MDWRSZ_SHIFT	18
 #define SPI_PFL_MODE_MDWRSZ_MASK	BIT(SPI_PFL_MODE_MDWRSZ_SHIFT)
 #define SPI_PFL_MODE_3WIRE_SHIFT	20
 #define SPI_PFL_MODE_3WIRE_MASK		BIT(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		BIT(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)

 #define HSSPI_MAX_DATA_SIZE		(HSSPI_FIFO_SIZE - HSSPI_FIFO_OP_SIZE)

 #define SPIM_CTRL_CS_OVERRIDE_SEL_SHIFT		0
 #define SPIM_CTRL_CS_OVERRIDE_SEL_MASK		0xff
 #define SPIM_CTRL_CS_OVERRIDE_VAL_SHIFT		8
 #define SPIM_CTRL_CS_OVERRIDE_VAL_MASK		0xff

 struct bcmbca_hsspi_priv {
 	void __iomem *regs;
 	void __iomem *spim_ctrl;
 	u32 clk_rate;
 	u8 num_cs;
 	u8 cs_pols;
 	u32 speed;
 };

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

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

 	return 0;
 }

 static int bcmbca_hsspi_set_mode(struct udevice *bus, uint mode)
 {
 	struct bcmbca_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 bcmbca_hsspi_set_speed(struct udevice *bus, uint speed)
 {
 	struct bcmbca_hsspi_priv *priv = dev_get_priv(bus);

 	priv->speed = speed;

 	return 0;
 }

 static void bcmbca_hsspi_setup_clock(struct bcmbca_hsspi_priv *priv,
 				     struct dm_spi_slave_plat *plat)
 {
 	u32 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;

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

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

 static void bcmbca_hsspi_activate_cs(struct bcmbca_hsspi_priv *priv,
 				     struct dm_spi_slave_plat *plat)
 {
 	u32 val;

 	/* set the override bit */
 	val = readl(priv->spim_ctrl);
 	val |= BIT(plat->cs + SPIM_CTRL_CS_OVERRIDE_SEL_SHIFT);
 	writel(val, priv->spim_ctrl);
 }

 static void bcmbca_hsspi_deactivate_cs(struct bcmbca_hsspi_priv *priv,
 				       struct dm_spi_slave_plat *plat)
 {
 	u32 val;

 	/* clear the cs override bit */
 	val = readl(priv->spim_ctrl);
 	val &= ~BIT(plat->cs + SPIM_CTRL_CS_OVERRIDE_SEL_SHIFT);
 	writel(val, priv->spim_ctrl);
 }

 static int bcmbca_hsspi_xfer(struct udevice *dev, unsigned int bitlen,
 			     const void *dout, void *din, unsigned long flags)
 {
 	struct bcmbca_hsspi_priv *priv = dev_get_priv(dev->parent);
 	struct dm_spi_slave_plat *plat = dev_get_parent_plat(dev);
 	size_t data_bytes = bitlen / 8;
 	size_t step_size = HSSPI_FIFO_SIZE;
 	u16 opcode = 0;
 	u32 val = SPI_PFL_MODE_FILL_MASK;
 	const u8 *tx = dout;
 	u8 *rx = din;
 	u32 cs_act = 0;

 	if (flags & SPI_XFER_BEGIN)
 		bcmbca_hsspi_setup_clock(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 */
 		if (plat->mode & SPI_RX_DUAL)
 			val |= SPI_PFL_MODE_MDRDSZ_MASK;
 		if (plat->mode & SPI_TX_DUAL)
 			val |= 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);

 		/* make sure we keep cs active until spi transfer is done */
 		if (!cs_act) {
 			bcmbca_hsspi_activate_cs(priv, plat);
 			cs_act = 1;
 		}

 		/* 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) {
 			bcmbca_hsspi_deactivate_cs(priv, plat);
 			dev_err(dev, "interrupt timeout\n");
 			return ret;
 		}

 		data_bytes -= curr_step;
 		if ((flags & SPI_XFER_END) && !data_bytes)
 			bcmbca_hsspi_deactivate_cs(priv, plat);

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

 	return 0;
 }

 static const struct dm_spi_ops bcmbca_hsspi_ops = {
 	.cs_info = bcmbca_hsspi_cs_info,
 	.set_mode = bcmbca_hsspi_set_mode,
 	.set_speed = bcmbca_hsspi_set_speed,
 	.xfer = bcmbca_hsspi_xfer,
 };

 static const struct udevice_id bcmbca_hsspi_ids[] = {
 	{ .compatible = "brcm,bcmbca-hsspi-v1.1", },
 	{ /* sentinel */ }
 };

 static int bcmbca_hsspi_child_pre_probe(struct udevice *dev)
 {
 	struct bcmbca_hsspi_priv *priv = dev_get_priv(dev->parent);
 	struct dm_spi_slave_plat *plat = dev_get_parent_plat(dev);
 	u32 val;

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

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

 	/* set the polarity to spim cs register */
 	val = readl(priv->spim_ctrl);
 	val &= ~BIT(plat->cs + SPIM_CTRL_CS_OVERRIDE_VAL_SHIFT);
 	if (priv->cs_pols & BIT(plat->cs))
 		val |= BIT(plat->cs + SPIM_CTRL_CS_OVERRIDE_VAL_SHIFT);
 	writel(val, priv->spim_ctrl);

 	return 0;
 }

 static int bcmbca_hsspi_probe(struct udevice *dev)
 {
 	struct bcmbca_hsspi_priv *priv = dev_get_priv(dev);
 	struct clk clk;
 	int ret;

 	priv->regs = dev_remap_addr_name(dev, "hsspi");
 	if (!priv->regs)
 		return -EINVAL;

 	priv->spim_ctrl = dev_remap_addr_name(dev, "spim-ctrl");
 	if (!priv->spim_ctrl) {
 		dev_err(dev, "misc spim ctrl register not defined in dts!\n");
 		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 && ret != -ENOSYS)
 		return ret;

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

 	priv->clk_rate = clk_get_rate(&clk);

 	/* 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;

 	dev_info(dev, "Broadcom BCMBCA HS SPI bus driver\n");
 	return 0;
 }

 U_BOOT_DRIVER(bcmbca_hsspi) = {
 	.name = "bcmbca_hsspi",
 	.id = UCLASS_SPI,
 	.of_match = bcmbca_hsspi_ids,
 	.ops = &bcmbca_hsspi_ops,
 	.priv_auto = sizeof(struct bcmbca_hsspi_priv),
 	.child_pre_probe = bcmbca_hsspi_child_pre_probe,
 	.probe = bcmbca_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>
	* Copyright (C) 2021 Broadcom Ltd
	*/

	#include <common.h>
	#include <asm/io.h>
	#include <clk.h>
	#include <spi.h>
	#include <reset.h>
	#include <wait_bit.h>
	#include <dm.h>
	#include <dm/device_compat.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 BIT(SPI_CTL_CLK_GATE_SHIFT)
	#define SPI_CTL_CLK_POL_SHIFT 17
	#define SPI_CTL_CLK_POL_MASK BIT(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 BIT(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 BIT(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 BIT(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 BIT(SPI_PFL_SIG_LATCHRIS_SHIFT)
	#define SPI_PFL_SIG_LAUNCHRIS_SHIFT 13
	#define SPI_PFL_SIG_LAUNCHRIS_MASK BIT(SPI_PFL_SIG_LAUNCHRIS_SHIFT)
	#define SPI_PFL_SIG_ASYNCIN_SHIFT 16
	#define SPI_PFL_SIG_ASYNCIN_MASK BIT(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 BIT(SPI_PFL_MODE_MDRDSZ_SHIFT)
	#define SPI_PFL_MODE_MDWRSZ_SHIFT 18
	#define SPI_PFL_MODE_MDWRSZ_MASK BIT(SPI_PFL_MODE_MDWRSZ_SHIFT)
	#define SPI_PFL_MODE_3WIRE_SHIFT 20
	#define SPI_PFL_MODE_3WIRE_MASK BIT(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 BIT(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)

	#define HSSPI_MAX_DATA_SIZE (HSSPI_FIFO_SIZE - HSSPI_FIFO_OP_SIZE)

	#define SPIM_CTRL_CS_OVERRIDE_SEL_SHIFT 0
	#define SPIM_CTRL_CS_OVERRIDE_SEL_MASK 0xff
	#define SPIM_CTRL_CS_OVERRIDE_VAL_SHIFT 8
	#define SPIM_CTRL_CS_OVERRIDE_VAL_MASK 0xff

	struct bcmbca_hsspi_priv {
	void __iomem *regs;
	void __iomem *spim_ctrl;
	u32 clk_rate;
	u8 num_cs;
	u8 cs_pols;
	u32 speed;
	};

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

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

	return 0;
	}

	static int bcmbca_hsspi_set_mode(struct udevice *bus, uint mode)
	{
	struct bcmbca_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 bcmbca_hsspi_set_speed(struct udevice *bus, uint speed)
	{
	struct bcmbca_hsspi_priv *priv = dev_get_priv(bus);

	priv->speed = speed;

	return 0;
	}

	static void bcmbca_hsspi_setup_clock(struct bcmbca_hsspi_priv *priv,
	struct dm_spi_slave_plat *plat)
	{
	u32 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;

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

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

	static void bcmbca_hsspi_activate_cs(struct bcmbca_hsspi_priv *priv,
	struct dm_spi_slave_plat *plat)
	{
	u32 val;

	/* set the override bit */
	val = readl(priv->spim_ctrl);
	val \|= BIT(plat->cs + SPIM_CTRL_CS_OVERRIDE_SEL_SHIFT);
	writel(val, priv->spim_ctrl);
	}

	static void bcmbca_hsspi_deactivate_cs(struct bcmbca_hsspi_priv *priv,
	struct dm_spi_slave_plat *plat)
	{
	u32 val;

	/* clear the cs override bit */
	val = readl(priv->spim_ctrl);
	val &= ~BIT(plat->cs + SPIM_CTRL_CS_OVERRIDE_SEL_SHIFT);
	writel(val, priv->spim_ctrl);
	}

	static int bcmbca_hsspi_xfer(struct udevice *dev, unsigned int bitlen,
	const void dout, void din, unsigned long flags)
	{
	struct bcmbca_hsspi_priv *priv = dev_get_priv(dev->parent);
	struct dm_spi_slave_plat *plat = dev_get_parent_plat(dev);
	size_t data_bytes = bitlen / 8;
	size_t step_size = HSSPI_FIFO_SIZE;
	u16 opcode = 0;
	u32 val = SPI_PFL_MODE_FILL_MASK;
	const u8 *tx = dout;
	u8 *rx = din;
	u32 cs_act = 0;

	if (flags & SPI_XFER_BEGIN)
	bcmbca_hsspi_setup_clock(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 */
	if (plat->mode & SPI_RX_DUAL)
	val \|= SPI_PFL_MODE_MDRDSZ_MASK;
	if (plat->mode & SPI_TX_DUAL)
	val \|= 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);

	/* make sure we keep cs active until spi transfer is done */
	if (!cs_act) {
	bcmbca_hsspi_activate_cs(priv, plat);
	cs_act = 1;
	}

	/* 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) {
	bcmbca_hsspi_deactivate_cs(priv, plat);
	dev_err(dev, "interrupt timeout\n");
	return ret;
	}

	data_bytes -= curr_step;
	if ((flags & SPI_XFER_END) && !data_bytes)
	bcmbca_hsspi_deactivate_cs(priv, plat);

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

	return 0;
	}

	static const struct dm_spi_ops bcmbca_hsspi_ops = {
	.cs_info = bcmbca_hsspi_cs_info,
	.set_mode = bcmbca_hsspi_set_mode,
	.set_speed = bcmbca_hsspi_set_speed,
	.xfer = bcmbca_hsspi_xfer,
	};

	static const struct udevice_id bcmbca_hsspi_ids[] = {
	{ .compatible = "brcm,bcmbca-hsspi-v1.1", },
	{ /* sentinel */ }
	};

	static int bcmbca_hsspi_child_pre_probe(struct udevice *dev)
	{
	struct bcmbca_hsspi_priv *priv = dev_get_priv(dev->parent);
	struct dm_spi_slave_plat *plat = dev_get_parent_plat(dev);
	u32 val;

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

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

	/* set the polarity to spim cs register */
	val = readl(priv->spim_ctrl);
	val &= ~BIT(plat->cs + SPIM_CTRL_CS_OVERRIDE_VAL_SHIFT);
	if (priv->cs_pols & BIT(plat->cs))
	val \|= BIT(plat->cs + SPIM_CTRL_CS_OVERRIDE_VAL_SHIFT);
	writel(val, priv->spim_ctrl);

	return 0;
	}

	static int bcmbca_hsspi_probe(struct udevice *dev)
	{
	struct bcmbca_hsspi_priv *priv = dev_get_priv(dev);
	struct clk clk;
	int ret;

	priv->regs = dev_remap_addr_name(dev, "hsspi");
	if (!priv->regs)
	return -EINVAL;

	priv->spim_ctrl = dev_remap_addr_name(dev, "spim-ctrl");
	if (!priv->spim_ctrl) {
	dev_err(dev, "misc spim ctrl register not defined in dts!\n");
	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 && ret != -ENOSYS)
	return ret;

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

	priv->clk_rate = clk_get_rate(&clk);

	/* 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;

	dev_info(dev, "Broadcom BCMBCA HS SPI bus driver\n");
	return 0;
	}

	U_BOOT_DRIVER(bcmbca_hsspi) = {
	.name = "bcmbca_hsspi",
	.id = UCLASS_SPI,
	.of_match = bcmbca_hsspi_ids,
	.ops = &bcmbca_hsspi_ops,
	.priv_auto = sizeof(struct bcmbca_hsspi_priv),
	.child_pre_probe = bcmbca_hsspi_child_pre_probe,
	.probe = bcmbca_hsspi_probe,
	};