[v3,14/15] spi: bcmbca-hsspi: Add driver for newer HSSPI controller

diff --git a/drivers/spi/Kconfig b/drivers/spi/Kconfig
index 3b1c0878bb85..771244582d03 100644
--- a/drivers/spi/Kconfig
+++ b/drivers/spi/Kconfig
@@ -199,6 +199,15 @@  config SPI_BCM_QSPI
 	  based platforms. This driver works for both SPI master for SPI NOR
 	  flash device as well as MSPI device.
 
+config SPI_BCMBCA_HSSPI
+	tristate "Broadcom BCMBCA HS SPI controller driver"
+	depends on ARCH_BCMBCA || COMPILE_TEST
+	help
+	  This enables support for the High Speed SPI controller present on
+	  newer Broadcom BCMBCA SoCs. These SoCs include an updated SPI controller
+	  that adds the capability to allow the driver to control chip select
+	  explicitly.
+
 config SPI_BITBANG
 	tristate "Utilities for Bitbanging SPI masters"
 	help
diff --git a/drivers/spi/Makefile b/drivers/spi/Makefile
index be9ba40ef8d0..fe92106447c3 100644
--- a/drivers/spi/Makefile
+++ b/drivers/spi/Makefile
@@ -30,6 +30,7 @@  obj-$(CONFIG_SPI_BCM2835)		+= spi-bcm2835.o
 obj-$(CONFIG_SPI_BCM2835AUX)		+= spi-bcm2835aux.o
 obj-$(CONFIG_SPI_BCM63XX)		+= spi-bcm63xx.o
 obj-$(CONFIG_SPI_BCM63XX_HSSPI)		+= spi-bcm63xx-hsspi.o
+obj-$(CONFIG_SPI_BCMBCA_HSSPI)		+= spi-bcmbca-hsspi.o
 obj-$(CONFIG_SPI_BCM_QSPI)		+= spi-iproc-qspi.o spi-brcmstb-qspi.o spi-bcm-qspi.o
 obj-$(CONFIG_SPI_BITBANG)		+= spi-bitbang.o
 obj-$(CONFIG_SPI_BUTTERFLY)		+= spi-butterfly.o
diff --git a/drivers/spi/spi-bcmbca-hsspi.c b/drivers/spi/spi-bcmbca-hsspi.c
new file mode 100644
index 000000000000..d58033251c02
--- /dev/null
+++ b/drivers/spi/spi-bcmbca-hsspi.c
@@ -0,0 +1,651 @@ 
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * Broadcom BCMBCA High Speed SPI Controller driver
+ *
+ * Copyright 2000-2010 Broadcom Corporation
+ * Copyright 2012-2013 Jonas Gorski <jogo@openwrt.org>
+ * Copyright 2019-2022 Broadcom Ltd
+ */
+
+#include <linux/kernel.h>
+#include <linux/init.h>
+#include <linux/io.h>
+#include <linux/clk.h>
+#include <linux/module.h>
+#include <linux/platform_device.h>
+#include <linux/delay.h>
+#include <linux/dma-mapping.h>
+#include <linux/err.h>
+#include <linux/interrupt.h>
+#include <linux/spi/spi.h>
+#include <linux/mutex.h>
+#include <linux/of.h>
+#include <linux/spi/spi-mem.h>
+#include <linux/pm_runtime.h>
+
+#define HSSPI_GLOBAL_CTRL_REG			0x0
+#define GLOBAL_CTRL_CS_POLARITY_SHIFT		0
+#define GLOBAL_CTRL_CS_POLARITY_MASK		0x000000ff
+#define GLOBAL_CTRL_PLL_CLK_CTRL_SHIFT		8
+#define GLOBAL_CTRL_PLL_CLK_CTRL_MASK		0x0000ff00
+#define GLOBAL_CTRL_CLK_GATE_SSOFF		BIT(16)
+#define GLOBAL_CTRL_CLK_POLARITY		BIT(17)
+#define GLOBAL_CTRL_MOSI_IDLE			BIT(18)
+
+#define HSSPI_GLOBAL_EXT_TRIGGER_REG		0x4
+
+#define HSSPI_INT_STATUS_REG			0x8
+#define HSSPI_INT_STATUS_MASKED_REG		0xc
+#define HSSPI_INT_MASK_REG			0x10
+
+#define HSSPI_PINGx_CMD_DONE(i)			BIT((i * 8) + 0)
+#define HSSPI_PINGx_RX_OVER(i)			BIT((i * 8) + 1)
+#define HSSPI_PINGx_TX_UNDER(i)			BIT((i * 8) + 2)
+#define HSSPI_PINGx_POLL_TIMEOUT(i)		BIT((i * 8) + 3)
+#define HSSPI_PINGx_CTRL_INVAL(i)		BIT((i * 8) + 4)
+
+#define HSSPI_INT_CLEAR_ALL			0xff001f1f
+
+#define HSSPI_PINGPONG_COMMAND_REG(x)		(0x80 + (x) * 0x40)
+#define PINGPONG_CMD_COMMAND_MASK		0xf
+#define PINGPONG_COMMAND_NOOP			0
+#define PINGPONG_COMMAND_START_NOW		1
+#define PINGPONG_COMMAND_START_TRIGGER		2
+#define PINGPONG_COMMAND_HALT			3
+#define PINGPONG_COMMAND_FLUSH			4
+#define PINGPONG_CMD_PROFILE_SHIFT		8
+#define PINGPONG_CMD_SS_SHIFT			12
+
+#define HSSPI_PINGPONG_STATUS_REG(x)		(0x84 + (x) * 0x40)
+#define HSSPI_PINGPONG_STATUS_SRC_BUSY          BIT(1)
+
+#define HSSPI_PROFILE_CLK_CTRL_REG(x)		(0x100 + (x) * 0x20)
+#define CLK_CTRL_FREQ_CTRL_MASK			0x0000ffff
+#define CLK_CTRL_SPI_CLK_2X_SEL			BIT(14)
+#define CLK_CTRL_ACCUM_RST_ON_LOOP		BIT(15)
+#define CLK_CTRL_CLK_POLARITY			BIT(16)
+
+#define HSSPI_PROFILE_SIGNAL_CTRL_REG(x)	(0x104 + (x) * 0x20)
+#define SIGNAL_CTRL_LATCH_RISING		BIT(12)
+#define SIGNAL_CTRL_LAUNCH_RISING		BIT(13)
+#define SIGNAL_CTRL_ASYNC_INPUT_PATH		BIT(16)
+
+#define HSSPI_PROFILE_MODE_CTRL_REG(x)		(0x108 + (x) * 0x20)
+#define MODE_CTRL_MULTIDATA_RD_STRT_SHIFT	8
+#define MODE_CTRL_MULTIDATA_WR_STRT_SHIFT	12
+#define MODE_CTRL_MULTIDATA_RD_SIZE_SHIFT	16
+#define MODE_CTRL_MULTIDATA_WR_SIZE_SHIFT	18
+#define MODE_CTRL_MODE_3WIRE			BIT(20)
+#define MODE_CTRL_PREPENDBYTE_CNT_SHIFT		24
+
+#define HSSPI_FIFO_REG(x)			(0x200 + (x) * 0x200)
+
+#define HSSPI_OP_MULTIBIT			BIT(11)
+#define HSSPI_OP_CODE_SHIFT			13
+#define HSSPI_OP_SLEEP				(0 << HSSPI_OP_CODE_SHIFT)
+#define HSSPI_OP_READ_WRITE			(1 << HSSPI_OP_CODE_SHIFT)
+#define HSSPI_OP_WRITE				(2 << HSSPI_OP_CODE_SHIFT)
+#define HSSPI_OP_READ				(3 << HSSPI_OP_CODE_SHIFT)
+#define HSSPI_OP_SETIRQ				(4 << HSSPI_OP_CODE_SHIFT)
+
+#define HSSPI_BUFFER_LEN			512
+#define HSSPI_OPCODE_LEN			2
+
+#define HSSPI_MAX_PREPEND_LEN			15
+
+#define HSSPI_MAX_SYNC_CLOCK			30000000
+
+#define HSSPI_SPI_MAX_CS			8
+#define HSSPI_BUS_NUM				1	/* 0 is legacy SPI */
+#define HSSPI_POLL_STATUS_TIMEOUT_MS	100
+
+#define HSSPI_WAIT_MODE_POLLING		0
+#define HSSPI_WAIT_MODE_INTR		1
+#define HSSPI_WAIT_MODE_MAX			HSSPI_WAIT_MODE_INTR
+
+#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 {
+	struct completion done;
+	struct mutex bus_mutex;
+	struct mutex msg_mutex;
+	struct platform_device *pdev;
+	struct clk *clk;
+	struct clk *pll_clk;
+	void __iomem *regs;
+	void __iomem *spim_ctrl;
+	u8 __iomem *fifo;
+	u32 speed_hz;
+	u8 cs_polarity;
+	u32 wait_mode;
+};
+
+static ssize_t wait_mode_show(struct device *dev, struct device_attribute *attr,
+			 char *buf)
+{
+	struct spi_controller *ctrl = dev_get_drvdata(dev);
+	struct bcmbca_hsspi *bs = spi_master_get_devdata(ctrl);
+
+	return sprintf(buf, "%d\n", bs->wait_mode);
+}
+
+static ssize_t wait_mode_store(struct device *dev, struct device_attribute *attr,
+			  const char *buf, size_t count)
+{
+	struct spi_controller *ctrl = dev_get_drvdata(dev);
+	struct bcmbca_hsspi *bs = spi_master_get_devdata(ctrl);
+	u32 val;
+
+	if (kstrtou32(buf, 10, &val))
+		return -EINVAL;
+
+	if (val > HSSPI_WAIT_MODE_MAX) {
+		dev_warn(dev, "invalid wait mode %u\n", val);
+		return -EINVAL;
+	}
+
+	mutex_lock(&bs->msg_mutex);
+	bs->wait_mode = val;
+	/* clear interrupt status to avoid spurious int on next transfer */
+	if (val == HSSPI_WAIT_MODE_INTR)
+		__raw_writel(HSSPI_INT_CLEAR_ALL, bs->regs + HSSPI_INT_STATUS_REG);
+	mutex_unlock(&bs->msg_mutex);
+
+	return count;
+}
+
+static DEVICE_ATTR_RW(wait_mode);
+
+static struct attribute *bcmbca_hsspi_attrs[] = {
+	&dev_attr_wait_mode.attr,
+	NULL,
+};
+
+static const struct attribute_group bcmbca_hsspi_group = {
+	.attrs = bcmbca_hsspi_attrs,
+};
+
+static void bcmbca_hsspi_set_cs(struct bcmbca_hsspi *bs, unsigned int cs,
+				 bool active)
+{
+	u32 reg;
+
+	/* No cs orerriden needed for SS7 internal cs on pcm based voice dev */
+	if (cs == 7)
+		return;
+
+	mutex_lock(&bs->bus_mutex);
+
+	reg = __raw_readl(bs->spim_ctrl);
+	if (active)
+		reg |= BIT(cs + SPIM_CTRL_CS_OVERRIDE_SEL_SHIFT);
+	else
+		reg &= ~BIT(cs + SPIM_CTRL_CS_OVERRIDE_SEL_SHIFT);
+
+	__raw_writel(reg, bs->spim_ctrl);
+
+	mutex_unlock(&bs->bus_mutex);
+}
+
+static void bcmbca_hsspi_set_clk(struct bcmbca_hsspi *bs,
+				  struct spi_device *spi, int hz)
+{
+	unsigned int profile = spi->chip_select;
+	u32 reg;
+
+	reg = DIV_ROUND_UP(2048, DIV_ROUND_UP(bs->speed_hz, hz));
+	__raw_writel(CLK_CTRL_ACCUM_RST_ON_LOOP | reg,
+		     bs->regs + HSSPI_PROFILE_CLK_CTRL_REG(profile));
+
+	reg = __raw_readl(bs->regs + HSSPI_PROFILE_SIGNAL_CTRL_REG(profile));
+	if (hz > HSSPI_MAX_SYNC_CLOCK)
+		reg |= SIGNAL_CTRL_ASYNC_INPUT_PATH;
+	else
+		reg &= ~SIGNAL_CTRL_ASYNC_INPUT_PATH;
+	__raw_writel(reg, bs->regs + HSSPI_PROFILE_SIGNAL_CTRL_REG(profile));
+
+	mutex_lock(&bs->bus_mutex);
+	/* setup clock polarity */
+	reg = __raw_readl(bs->regs + HSSPI_GLOBAL_CTRL_REG);
+	reg &= ~GLOBAL_CTRL_CLK_POLARITY;
+	if (spi->mode & SPI_CPOL)
+		reg |= GLOBAL_CTRL_CLK_POLARITY;
+	__raw_writel(reg, bs->regs + HSSPI_GLOBAL_CTRL_REG);
+
+	mutex_unlock(&bs->bus_mutex);
+}
+
+static int bcmbca_hsspi_wait_cmd(struct bcmbca_hsspi *bs, unsigned int cs)
+{
+	unsigned long limit;
+	u32 reg = 0;
+	int rc = 0;
+
+	if (bs->wait_mode == HSSPI_WAIT_MODE_INTR) {
+		if (wait_for_completion_timeout(&bs->done, HZ) == 0)
+			rc = 1;
+	} else {
+		limit = jiffies + msecs_to_jiffies(HSSPI_POLL_STATUS_TIMEOUT_MS);
+
+		while (!time_after(jiffies, limit)) {
+			reg = __raw_readl(bs->regs + HSSPI_PINGPONG_STATUS_REG(0));
+			if (reg & HSSPI_PINGPONG_STATUS_SRC_BUSY)
+				cpu_relax();
+			else
+				break;
+		}
+		if (reg & HSSPI_PINGPONG_STATUS_SRC_BUSY)
+			rc = 1;
+	}
+
+	if (rc)
+		dev_err(&bs->pdev->dev, "transfer timed out!\n");
+
+	return rc;
+}
+
+static int bcmbca_hsspi_do_txrx(struct spi_device *spi, struct spi_transfer *t,
+								struct spi_message *msg)
+{
+	struct bcmbca_hsspi *bs = spi_master_get_devdata(spi->master);
+	unsigned int chip_select = spi->chip_select;
+	u16 opcode = 0;
+	int pending = t->len;
+	int step_size = HSSPI_BUFFER_LEN;
+	const u8 *tx = t->tx_buf;
+	u8 *rx = t->rx_buf;
+	u32 reg = 0, cs_act = 0;
+
+	bcmbca_hsspi_set_clk(bs, spi, t->speed_hz);
+
+	if (tx && rx)
+		opcode = HSSPI_OP_READ_WRITE;
+	else if (tx)
+		opcode = HSSPI_OP_WRITE;
+	else if (rx)
+		opcode = HSSPI_OP_READ;
+
+	if (opcode != HSSPI_OP_READ)
+		step_size -= HSSPI_OPCODE_LEN;
+
+	if ((opcode == HSSPI_OP_READ && t->rx_nbits == SPI_NBITS_DUAL) ||
+	    (opcode == HSSPI_OP_WRITE && t->tx_nbits == SPI_NBITS_DUAL)) {
+		opcode |= HSSPI_OP_MULTIBIT;
+
+		if (t->rx_nbits == SPI_NBITS_DUAL)
+			reg |= 1 << MODE_CTRL_MULTIDATA_RD_SIZE_SHIFT;
+		if (t->tx_nbits == SPI_NBITS_DUAL)
+			reg |= 1 << MODE_CTRL_MULTIDATA_WR_SIZE_SHIFT;
+	}
+
+	__raw_writel(reg | 0xff,
+		     bs->regs + HSSPI_PROFILE_MODE_CTRL_REG(chip_select));
+
+	while (pending > 0) {
+		int curr_step = min_t(int, step_size, pending);
+
+		reinit_completion(&bs->done);
+		if (tx) {
+			memcpy_toio(bs->fifo + HSSPI_OPCODE_LEN, tx, curr_step);
+			tx += curr_step;
+		}
+		__raw_writew((u16)cpu_to_be16(opcode | curr_step), bs->fifo);
+
+		/* enable interrupt */
+		if (bs->wait_mode == HSSPI_WAIT_MODE_INTR)
+			__raw_writel(HSSPI_PINGx_CMD_DONE(0),
+			    bs->regs + HSSPI_INT_MASK_REG);
+
+		if (!cs_act) {
+			/* must apply cs signal as close as the cmd starts */
+			bcmbca_hsspi_set_cs(bs, chip_select, true);
+			cs_act = 1;
+		}
+
+		reg = chip_select << PINGPONG_CMD_SS_SHIFT |
+			    chip_select << PINGPONG_CMD_PROFILE_SHIFT |
+			    PINGPONG_COMMAND_START_NOW;
+		__raw_writel(reg, bs->regs + HSSPI_PINGPONG_COMMAND_REG(0));
+
+		if (bcmbca_hsspi_wait_cmd(bs, spi->chip_select))
+			return -ETIMEDOUT;
+
+		pending -= curr_step;
+
+		if (rx) {
+			memcpy_fromio(rx, bs->fifo, curr_step);
+			rx += curr_step;
+		}
+	}
+
+	return 0;
+}
+
+static int bcmbca_hsspi_setup(struct spi_device *spi)
+{
+	struct bcmbca_hsspi *bs = spi_master_get_devdata(spi->master);
+	u32 reg;
+
+	reg = __raw_readl(bs->regs +
+			  HSSPI_PROFILE_SIGNAL_CTRL_REG(spi->chip_select));
+	reg &= ~(SIGNAL_CTRL_LAUNCH_RISING | SIGNAL_CTRL_LATCH_RISING);
+	if (spi->mode & SPI_CPHA)
+		reg |= SIGNAL_CTRL_LAUNCH_RISING;
+	else
+		reg |= SIGNAL_CTRL_LATCH_RISING;
+	__raw_writel(reg, bs->regs +
+		     HSSPI_PROFILE_SIGNAL_CTRL_REG(spi->chip_select));
+
+	mutex_lock(&bs->bus_mutex);
+	reg = __raw_readl(bs->regs + HSSPI_GLOBAL_CTRL_REG);
+
+	if (spi->mode & SPI_CS_HIGH)
+		reg |= BIT(spi->chip_select);
+	else
+		reg &= ~BIT(spi->chip_select);
+	__raw_writel(reg, bs->regs + HSSPI_GLOBAL_CTRL_REG);
+
+	if (spi->mode & SPI_CS_HIGH)
+		bs->cs_polarity |= BIT(spi->chip_select);
+	else
+		bs->cs_polarity &= ~BIT(spi->chip_select);
+
+	reg = __raw_readl(bs->spim_ctrl);
+	reg &= ~BIT(spi->chip_select + SPIM_CTRL_CS_OVERRIDE_VAL_SHIFT);
+	if (spi->mode & SPI_CS_HIGH)
+		reg |= BIT(spi->chip_select + SPIM_CTRL_CS_OVERRIDE_VAL_SHIFT);
+	__raw_writel(reg, bs->spim_ctrl);
+
+	mutex_unlock(&bs->bus_mutex);
+
+	return 0;
+}
+
+static int bcmbca_hsspi_transfer_one(struct spi_master *master,
+				      struct spi_message *msg)
+{
+	struct bcmbca_hsspi *bs = spi_master_get_devdata(master);
+	struct spi_transfer *t;
+	struct spi_device *spi = msg->spi;
+	int status = -EINVAL;
+	bool keep_cs = false;
+
+	mutex_lock(&bs->msg_mutex);
+	list_for_each_entry(t, &msg->transfers, transfer_list) {
+		status = bcmbca_hsspi_do_txrx(spi, t, msg);
+		if (status)
+			break;
+
+		spi_transfer_delay_exec(t);
+
+		if (t->cs_change) {
+			if (list_is_last(&t->transfer_list,	&msg->transfers)) {
+				keep_cs = true;
+			} else {
+				if (!t->cs_off)
+					bcmbca_hsspi_set_cs(bs, spi->chip_select, false);
+
+				spi_transfer_cs_change_delay_exec(msg, t);
+
+				if (!list_next_entry(t, transfer_list)->cs_off)
+					bcmbca_hsspi_set_cs(bs, spi->chip_select, true);
+			}
+		} else if (!list_is_last(&t->transfer_list, &msg->transfers) &&
+			   t->cs_off != list_next_entry(t, transfer_list)->cs_off) {
+			bcmbca_hsspi_set_cs(bs, spi->chip_select, t->cs_off);
+		}
+
+		msg->actual_length += t->len;
+	}
+
+	mutex_unlock(&bs->msg_mutex);
+
+	if (status || !keep_cs)
+		bcmbca_hsspi_set_cs(bs, spi->chip_select, false);
+
+	msg->status = status;
+	spi_finalize_current_message(master);
+
+	return 0;
+}
+
+static irqreturn_t bcmbca_hsspi_interrupt(int irq, void *dev_id)
+{
+	struct bcmbca_hsspi *bs = (struct bcmbca_hsspi *)dev_id;
+
+	if (__raw_readl(bs->regs + HSSPI_INT_STATUS_MASKED_REG) == 0)
+		return IRQ_NONE;
+
+	__raw_writel(HSSPI_INT_CLEAR_ALL, bs->regs + HSSPI_INT_STATUS_REG);
+	__raw_writel(0, bs->regs + HSSPI_INT_MASK_REG);
+
+	complete(&bs->done);
+
+	return IRQ_HANDLED;
+}
+
+static int bcmbca_hsspi_probe(struct platform_device *pdev)
+{
+	struct spi_master *master;
+	struct bcmbca_hsspi *bs;
+	struct resource *res_mem;
+	void __iomem *spim_ctrl;
+	void __iomem *regs;
+	struct device *dev = &pdev->dev;
+	struct clk *clk, *pll_clk = NULL;
+	int irq, ret;
+	u32 reg, rate, num_cs = HSSPI_SPI_MAX_CS;
+
+	irq = platform_get_irq(pdev, 0);
+	if (irq < 0)
+		return irq;
+
+	res_mem = platform_get_resource_byname(pdev, IORESOURCE_MEM, "hsspi");
+	if (!res_mem)
+		return -EINVAL;
+	regs = devm_ioremap_resource(dev, res_mem);
+	if (IS_ERR(regs))
+		return PTR_ERR(regs);
+
+	res_mem = platform_get_resource_byname(pdev, IORESOURCE_MEM, "spim-ctrl");
+	if (!res_mem)
+		return -EINVAL;
+	spim_ctrl = devm_ioremap_resource(dev, res_mem);
+	if (IS_ERR(spim_ctrl))
+		return PTR_ERR(spim_ctrl);
+
+	clk = devm_clk_get(dev, "hsspi");
+	if (IS_ERR(clk))
+		return PTR_ERR(clk);
+
+	ret = clk_prepare_enable(clk);
+	if (ret)
+		return ret;
+
+	rate = clk_get_rate(clk);
+	if (!rate) {
+		pll_clk = devm_clk_get(dev, "pll");
+
+		if (IS_ERR(pll_clk)) {
+			ret = PTR_ERR(pll_clk);
+			goto out_disable_clk;
+		}
+
+		ret = clk_prepare_enable(pll_clk);
+		if (ret)
+			goto out_disable_clk;
+
+		rate = clk_get_rate(pll_clk);
+		if (!rate) {
+			ret = -EINVAL;
+			goto out_disable_pll_clk;
+		}
+	}
+
+	master = spi_alloc_master(&pdev->dev, sizeof(*bs));
+	if (!master) {
+		ret = -ENOMEM;
+		goto out_disable_pll_clk;
+	}
+
+	bs = spi_master_get_devdata(master);
+	bs->pdev = pdev;
+	bs->clk = clk;
+	bs->pll_clk = pll_clk;
+	bs->regs = regs;
+	bs->spim_ctrl = spim_ctrl;
+	bs->speed_hz = rate;
+	bs->fifo = (u8 __iomem *) (bs->regs + HSSPI_FIFO_REG(0));
+	bs->wait_mode = HSSPI_WAIT_MODE_POLLING;
+
+	mutex_init(&bs->bus_mutex);
+	mutex_init(&bs->msg_mutex);
+	init_completion(&bs->done);
+
+	master->dev.of_node = dev->of_node;
+	if (!dev->of_node)
+		master->bus_num = HSSPI_BUS_NUM;
+
+	of_property_read_u32(dev->of_node, "num-cs", &num_cs);
+	if (num_cs > 8) {
+		dev_warn(dev, "unsupported number of cs (%i), reducing to 8\n",
+			 num_cs);
+		num_cs = HSSPI_SPI_MAX_CS;
+	}
+	master->num_chipselect = num_cs;
+	master->setup = bcmbca_hsspi_setup;
+	master->transfer_one_message = bcmbca_hsspi_transfer_one;
+	master->mode_bits = SPI_CPOL | SPI_CPHA | SPI_CS_HIGH |
+	    SPI_RX_DUAL | SPI_TX_DUAL;
+	master->bits_per_word_mask = SPI_BPW_MASK(8);
+	master->auto_runtime_pm = true;
+
+	platform_set_drvdata(pdev, master);
+
+	/* Initialize the hardware */
+	__raw_writel(0, bs->regs + HSSPI_INT_MASK_REG);
+
+	/* clean up any pending interrupts */
+	__raw_writel(HSSPI_INT_CLEAR_ALL, bs->regs + HSSPI_INT_STATUS_REG);
+
+	/* read out default CS polarities */
+	reg = __raw_readl(bs->regs + HSSPI_GLOBAL_CTRL_REG);
+	bs->cs_polarity = reg & GLOBAL_CTRL_CS_POLARITY_MASK;
+	__raw_writel(reg | GLOBAL_CTRL_CLK_GATE_SSOFF,
+		     bs->regs + HSSPI_GLOBAL_CTRL_REG);
+
+	if (irq > 0) {
+		ret = devm_request_irq(dev, irq, bcmbca_hsspi_interrupt, IRQF_SHARED,
+			       pdev->name, bs);
+		if (ret)
+			goto out_put_master;
+	}
+
+	pm_runtime_enable(&pdev->dev);
+
+	if (sysfs_create_group(&pdev->dev.kobj, &bcmbca_hsspi_group)) {
+		dev_err(&pdev->dev, "couldn't register sysfs group\n");
+		goto out_pm_disable;
+	}
+
+	/* register and we are done */
+	ret = devm_spi_register_master(dev, master);
+	if (ret)
+		goto out_sysgroup_disable;
+
+	dev_info(dev, "Broadcom BCMBCA High Speed SPI Controller driver");
+
+	return 0;
+
+out_sysgroup_disable:
+	sysfs_remove_group(&pdev->dev.kobj, &bcmbca_hsspi_group);
+out_pm_disable:
+	pm_runtime_disable(&pdev->dev);
+out_put_master:
+	spi_master_put(master);
+out_disable_pll_clk:
+	clk_disable_unprepare(pll_clk);
+out_disable_clk:
+	clk_disable_unprepare(clk);
+	return ret;
+}
+
+static int bcmbca_hsspi_remove(struct platform_device *pdev)
+{
+	struct spi_master *master = platform_get_drvdata(pdev);
+	struct bcmbca_hsspi *bs = spi_master_get_devdata(master);
+
+	/* reset the hardware and block queue progress */
+	__raw_writel(0, bs->regs + HSSPI_INT_MASK_REG);
+	clk_disable_unprepare(bs->pll_clk);
+	clk_disable_unprepare(bs->clk);
+	sysfs_remove_group(&pdev->dev.kobj, &bcmbca_hsspi_group);
+
+	return 0;
+}
+
+#ifdef CONFIG_PM_SLEEP
+static int bcmbca_hsspi_suspend(struct device *dev)
+{
+	struct spi_master *master = dev_get_drvdata(dev);
+	struct bcmbca_hsspi *bs = spi_master_get_devdata(master);
+
+	spi_master_suspend(master);
+	clk_disable_unprepare(bs->pll_clk);
+	clk_disable_unprepare(bs->clk);
+
+	return 0;
+}
+
+static int bcmbca_hsspi_resume(struct device *dev)
+{
+	struct spi_master *master = dev_get_drvdata(dev);
+	struct bcmbca_hsspi *bs = spi_master_get_devdata(master);
+	int ret;
+
+	ret = clk_prepare_enable(bs->clk);
+	if (ret)
+		return ret;
+
+	if (bs->pll_clk) {
+		ret = clk_prepare_enable(bs->pll_clk);
+		if (ret) {
+			clk_disable_unprepare(bs->clk);
+			return ret;
+		}
+	}
+
+	spi_master_resume(master);
+
+	return 0;
+}
+#endif
+
+static SIMPLE_DEV_PM_OPS(bcmbca_hsspi_pm_ops, bcmbca_hsspi_suspend,
+			 bcmbca_hsspi_resume);
+
+static const struct of_device_id bcmbca_hsspi_of_match[] = {
+	{ .compatible = "brcm,bcmbca-hsspi-v1.1", },
+	{},
+};
+
+MODULE_DEVICE_TABLE(of, bcmbca_hsspi_of_match);
+
+static struct platform_driver bcmbca_hsspi_driver = {
+	.driver = {
+		   .name = "bcmbca-hsspi",
+		   .pm = &bcmbca_hsspi_pm_ops,
+		   .of_match_table = bcmbca_hsspi_of_match,
+		   },
+	.probe = bcmbca_hsspi_probe,
+	.remove = bcmbca_hsspi_remove,
+};
+
+module_platform_driver(bcmbca_hsspi_driver);
+
+MODULE_ALIAS("platform:bcmbca_hsspi");
+MODULE_DESCRIPTION("Broadcom BCMBCA High Speed SPI Controller driver");
+MODULE_LICENSE("GPL");