Adding upstream version 4.19.249.upstream/4.19.249upstream

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 1184 insertions, 0 deletions

diff --git a/drivers/soundwire/cadence_master.c b/drivers/soundwire/cadence_master.c
new file mode 100644
index 000000000..70f78eda0
--- /dev/null
+++ b/drivers/soundwire/cadence_master.c
@@ -0,0 +1,1184 @@
+// SPDX-License-Identifier: (GPL-2.0 OR BSD-3-Clause)
+// Copyright(c) 2015-17 Intel Corporation.
+
+/*
+ * Cadence SoundWire Master module
+ * Used by Master driver
+ */
+
+#include <linux/delay.h>
+#include <linux/device.h>
+#include <linux/interrupt.h>
+#include <linux/module.h>
+#include <linux/mod_devicetable.h>
+#include <linux/soundwire/sdw_registers.h>
+#include <linux/soundwire/sdw.h>
+#include <sound/pcm_params.h>
+#include <sound/soc.h>
+#include "bus.h"
+#include "cadence_master.h"
+
+#define CDNS_MCP_CONFIG				0x0
+
+#define CDNS_MCP_CONFIG_MCMD_RETRY		GENMASK(27, 24)
+#define CDNS_MCP_CONFIG_MPREQ_DELAY		GENMASK(20, 16)
+#define CDNS_MCP_CONFIG_MMASTER			BIT(7)
+#define CDNS_MCP_CONFIG_BUS_REL			BIT(6)
+#define CDNS_MCP_CONFIG_SNIFFER			BIT(5)
+#define CDNS_MCP_CONFIG_SSPMOD			BIT(4)
+#define CDNS_MCP_CONFIG_CMD			BIT(3)
+#define CDNS_MCP_CONFIG_OP			GENMASK(2, 0)
+#define CDNS_MCP_CONFIG_OP_NORMAL		0
+
+#define CDNS_MCP_CONTROL			0x4
+
+#define CDNS_MCP_CONTROL_RST_DELAY		GENMASK(10, 8)
+#define CDNS_MCP_CONTROL_CMD_RST		BIT(7)
+#define CDNS_MCP_CONTROL_SOFT_RST		BIT(6)
+#define CDNS_MCP_CONTROL_SW_RST			BIT(5)
+#define CDNS_MCP_CONTROL_HW_RST			BIT(4)
+#define CDNS_MCP_CONTROL_CLK_PAUSE		BIT(3)
+#define CDNS_MCP_CONTROL_CLK_STOP_CLR		BIT(2)
+#define CDNS_MCP_CONTROL_CMD_ACCEPT		BIT(1)
+#define CDNS_MCP_CONTROL_BLOCK_WAKEUP		BIT(0)
+
+
+#define CDNS_MCP_CMDCTRL			0x8
+#define CDNS_MCP_SSPSTAT			0xC
+#define CDNS_MCP_FRAME_SHAPE			0x10
+#define CDNS_MCP_FRAME_SHAPE_INIT		0x14
+
+#define CDNS_MCP_CONFIG_UPDATE			0x18
+#define CDNS_MCP_CONFIG_UPDATE_BIT		BIT(0)
+
+#define CDNS_MCP_PHYCTRL			0x1C
+#define CDNS_MCP_SSP_CTRL0			0x20
+#define CDNS_MCP_SSP_CTRL1			0x28
+#define CDNS_MCP_CLK_CTRL0			0x30
+#define CDNS_MCP_CLK_CTRL1			0x38
+
+#define CDNS_MCP_STAT				0x40
+
+#define CDNS_MCP_STAT_ACTIVE_BANK		BIT(20)
+#define CDNS_MCP_STAT_CLK_STOP			BIT(16)
+
+#define CDNS_MCP_INTSTAT			0x44
+#define CDNS_MCP_INTMASK			0x48
+
+#define CDNS_MCP_INT_IRQ			BIT(31)
+#define CDNS_MCP_INT_WAKEUP			BIT(16)
+#define CDNS_MCP_INT_SLAVE_RSVD			BIT(15)
+#define CDNS_MCP_INT_SLAVE_ALERT		BIT(14)
+#define CDNS_MCP_INT_SLAVE_ATTACH		BIT(13)
+#define CDNS_MCP_INT_SLAVE_NATTACH		BIT(12)
+#define CDNS_MCP_INT_SLAVE_MASK			GENMASK(15, 12)
+#define CDNS_MCP_INT_DPINT			BIT(11)
+#define CDNS_MCP_INT_CTRL_CLASH			BIT(10)
+#define CDNS_MCP_INT_DATA_CLASH			BIT(9)
+#define CDNS_MCP_INT_CMD_ERR			BIT(7)
+#define CDNS_MCP_INT_RX_WL			BIT(2)
+#define CDNS_MCP_INT_TXE			BIT(1)
+
+#define CDNS_MCP_INTSET				0x4C
+
+#define CDNS_MCP_SLAVE_STAT			0x50
+#define CDNS_MCP_SLAVE_STAT_MASK		GENMASK(1, 0)
+
+#define CDNS_MCP_SLAVE_INTSTAT0			0x54
+#define CDNS_MCP_SLAVE_INTSTAT1			0x58
+#define CDNS_MCP_SLAVE_INTSTAT_NPRESENT		BIT(0)
+#define CDNS_MCP_SLAVE_INTSTAT_ATTACHED		BIT(1)
+#define CDNS_MCP_SLAVE_INTSTAT_ALERT		BIT(2)
+#define CDNS_MCP_SLAVE_INTSTAT_RESERVED		BIT(3)
+#define CDNS_MCP_SLAVE_STATUS_BITS		GENMASK(3, 0)
+#define CDNS_MCP_SLAVE_STATUS_NUM		4
+
+#define CDNS_MCP_SLAVE_INTMASK0			0x5C
+#define CDNS_MCP_SLAVE_INTMASK1			0x60
+
+#define CDNS_MCP_SLAVE_INTMASK0_MASK		GENMASK(31, 0)
+#define CDNS_MCP_SLAVE_INTMASK1_MASK		GENMASK(15, 0)
+
+#define CDNS_MCP_PORT_INTSTAT			0x64
+#define CDNS_MCP_PDI_STAT			0x6C
+
+#define CDNS_MCP_FIFOLEVEL			0x78
+#define CDNS_MCP_FIFOSTAT			0x7C
+#define CDNS_MCP_RX_FIFO_AVAIL			GENMASK(5, 0)
+
+#define CDNS_MCP_CMD_BASE			0x80
+#define CDNS_MCP_RESP_BASE			0x80
+#define CDNS_MCP_CMD_LEN			0x20
+#define CDNS_MCP_CMD_WORD_LEN			0x4
+
+#define CDNS_MCP_CMD_SSP_TAG			BIT(31)
+#define CDNS_MCP_CMD_COMMAND			GENMASK(30, 28)
+#define CDNS_MCP_CMD_DEV_ADDR			GENMASK(27, 24)
+#define CDNS_MCP_CMD_REG_ADDR_H			GENMASK(23, 16)
+#define CDNS_MCP_CMD_REG_ADDR_L			GENMASK(15, 8)
+#define CDNS_MCP_CMD_REG_DATA			GENMASK(7, 0)
+
+#define CDNS_MCP_CMD_READ			2
+#define CDNS_MCP_CMD_WRITE			3
+
+#define CDNS_MCP_RESP_RDATA			GENMASK(15, 8)
+#define CDNS_MCP_RESP_ACK			BIT(0)
+#define CDNS_MCP_RESP_NACK			BIT(1)
+
+#define CDNS_DP_SIZE				128
+
+#define CDNS_DPN_B0_CONFIG(n)			(0x100 + CDNS_DP_SIZE * (n))
+#define CDNS_DPN_B0_CH_EN(n)			(0x104 + CDNS_DP_SIZE * (n))
+#define CDNS_DPN_B0_SAMPLE_CTRL(n)		(0x108 + CDNS_DP_SIZE * (n))
+#define CDNS_DPN_B0_OFFSET_CTRL(n)		(0x10C + CDNS_DP_SIZE * (n))
+#define CDNS_DPN_B0_HCTRL(n)			(0x110 + CDNS_DP_SIZE * (n))
+#define CDNS_DPN_B0_ASYNC_CTRL(n)		(0x114 + CDNS_DP_SIZE * (n))
+
+#define CDNS_DPN_B1_CONFIG(n)			(0x118 + CDNS_DP_SIZE * (n))
+#define CDNS_DPN_B1_CH_EN(n)			(0x11C + CDNS_DP_SIZE * (n))
+#define CDNS_DPN_B1_SAMPLE_CTRL(n)		(0x120 + CDNS_DP_SIZE * (n))
+#define CDNS_DPN_B1_OFFSET_CTRL(n)		(0x124 + CDNS_DP_SIZE * (n))
+#define CDNS_DPN_B1_HCTRL(n)			(0x128 + CDNS_DP_SIZE * (n))
+#define CDNS_DPN_B1_ASYNC_CTRL(n)		(0x12C + CDNS_DP_SIZE * (n))
+
+#define CDNS_DPN_CONFIG_BPM			BIT(18)
+#define CDNS_DPN_CONFIG_BGC			GENMASK(17, 16)
+#define CDNS_DPN_CONFIG_WL			GENMASK(12, 8)
+#define CDNS_DPN_CONFIG_PORT_DAT		GENMASK(3, 2)
+#define CDNS_DPN_CONFIG_PORT_FLOW		GENMASK(1, 0)
+
+#define CDNS_DPN_SAMPLE_CTRL_SI			GENMASK(15, 0)
+
+#define CDNS_DPN_OFFSET_CTRL_1			GENMASK(7, 0)
+#define CDNS_DPN_OFFSET_CTRL_2			GENMASK(15, 8)
+
+#define CDNS_DPN_HCTRL_HSTOP			GENMASK(3, 0)
+#define CDNS_DPN_HCTRL_HSTART			GENMASK(7, 4)
+#define CDNS_DPN_HCTRL_LCTRL			GENMASK(10, 8)
+
+#define CDNS_PORTCTRL				0x130
+#define CDNS_PORTCTRL_DIRN			BIT(7)
+#define CDNS_PORTCTRL_BANK_INVERT		BIT(8)
+
+#define CDNS_PORT_OFFSET			0x80
+
+#define CDNS_PDI_CONFIG(n)			(0x1100 + (n) * 16)
+
+#define CDNS_PDI_CONFIG_SOFT_RESET		BIT(24)
+#define CDNS_PDI_CONFIG_CHANNEL			GENMASK(15, 8)
+#define CDNS_PDI_CONFIG_PORT			GENMASK(4, 0)
+
+/* Driver defaults */
+
+#define CDNS_DEFAULT_CLK_DIVIDER		0
+#define CDNS_DEFAULT_FRAME_SHAPE		0x30
+#define CDNS_DEFAULT_SSP_INTERVAL		0x18
+#define CDNS_TX_TIMEOUT				2000
+
+#define CDNS_PCM_PDI_OFFSET			0x2
+#define CDNS_PDM_PDI_OFFSET			0x6
+
+#define CDNS_SCP_RX_FIFOLEVEL			0x2
+
+/*
+ * register accessor helpers
+ */
+static inline u32 cdns_readl(struct sdw_cdns *cdns, int offset)
+{
+	return readl(cdns->registers + offset);
+}
+
+static inline void cdns_writel(struct sdw_cdns *cdns, int offset, u32 value)
+{
+	writel(value, cdns->registers + offset);
+}
+
+static inline void cdns_updatel(struct sdw_cdns *cdns,
+				int offset, u32 mask, u32 val)
+{
+	u32 tmp;
+
+	tmp = cdns_readl(cdns, offset);
+	tmp = (tmp & ~mask) | val;
+	cdns_writel(cdns, offset, tmp);
+}
+
+static int cdns_clear_bit(struct sdw_cdns *cdns, int offset, u32 value)
+{
+	int timeout = 10;
+	u32 reg_read;
+
+	writel(value, cdns->registers + offset);
+
+	/* Wait for bit to be self cleared */
+	do {
+		reg_read = readl(cdns->registers + offset);
+		if ((reg_read & value) == 0)
+			return 0;
+
+		timeout--;
+		udelay(50);
+	} while (timeout != 0);
+
+	return -EAGAIN;
+}
+
+/*
+ * IO Calls
+ */
+static enum sdw_command_response cdns_fill_msg_resp(
+			struct sdw_cdns *cdns,
+			struct sdw_msg *msg, int count, int offset)
+{
+	int nack = 0, no_ack = 0;
+	int i;
+
+	/* check message response */
+	for (i = 0; i < count; i++) {
+		if (!(cdns->response_buf[i] & CDNS_MCP_RESP_ACK)) {
+			no_ack = 1;
+			dev_dbg(cdns->dev, "Msg Ack not received\n");
+			if (cdns->response_buf[i] & CDNS_MCP_RESP_NACK) {
+				nack = 1;
+				dev_err(cdns->dev, "Msg NACK received\n");
+			}
+		}
+	}
+
+	if (nack) {
+		dev_err(cdns->dev, "Msg NACKed for Slave %d\n", msg->dev_num);
+		return SDW_CMD_FAIL;
+	} else if (no_ack) {
+		dev_dbg(cdns->dev, "Msg ignored for Slave %d\n", msg->dev_num);
+		return SDW_CMD_IGNORED;
+	}
+
+	/* fill response */
+	for (i = 0; i < count; i++)
+		msg->buf[i + offset] = cdns->response_buf[i] >>
+				SDW_REG_SHIFT(CDNS_MCP_RESP_RDATA);
+
+	return SDW_CMD_OK;
+}
+
+static enum sdw_command_response
+_cdns_xfer_msg(struct sdw_cdns *cdns, struct sdw_msg *msg, int cmd,
+				int offset, int count, bool defer)
+{
+	unsigned long time;
+	u32 base, i, data;
+	u16 addr;
+
+	/* Program the watermark level for RX FIFO */
+	if (cdns->msg_count != count) {
+		cdns_writel(cdns, CDNS_MCP_FIFOLEVEL, count);
+		cdns->msg_count = count;
+	}
+
+	base = CDNS_MCP_CMD_BASE;
+	addr = msg->addr;
+
+	for (i = 0; i < count; i++) {
+		data = msg->dev_num << SDW_REG_SHIFT(CDNS_MCP_CMD_DEV_ADDR);
+		data |= cmd << SDW_REG_SHIFT(CDNS_MCP_CMD_COMMAND);
+		data |= addr++  << SDW_REG_SHIFT(CDNS_MCP_CMD_REG_ADDR_L);
+
+		if (msg->flags == SDW_MSG_FLAG_WRITE)
+			data |= msg->buf[i + offset];
+
+		data |= msg->ssp_sync << SDW_REG_SHIFT(CDNS_MCP_CMD_SSP_TAG);
+		cdns_writel(cdns, base, data);
+		base += CDNS_MCP_CMD_WORD_LEN;
+	}
+
+	if (defer)
+		return SDW_CMD_OK;
+
+	/* wait for timeout or response */
+	time = wait_for_completion_timeout(&cdns->tx_complete,
+				msecs_to_jiffies(CDNS_TX_TIMEOUT));
+	if (!time) {
+		dev_err(cdns->dev, "IO transfer timed out\n");
+		msg->len = 0;
+		return SDW_CMD_TIMEOUT;
+	}
+
+	return cdns_fill_msg_resp(cdns, msg, count, offset);
+}
+
+static enum sdw_command_response cdns_program_scp_addr(
+			struct sdw_cdns *cdns, struct sdw_msg *msg)
+{
+	int nack = 0, no_ack = 0;
+	unsigned long time;
+	u32 data[2], base;
+	int i;
+
+	/* Program the watermark level for RX FIFO */
+	if (cdns->msg_count != CDNS_SCP_RX_FIFOLEVEL) {
+		cdns_writel(cdns, CDNS_MCP_FIFOLEVEL, CDNS_SCP_RX_FIFOLEVEL);
+		cdns->msg_count = CDNS_SCP_RX_FIFOLEVEL;
+	}
+
+	data[0] = msg->dev_num << SDW_REG_SHIFT(CDNS_MCP_CMD_DEV_ADDR);
+	data[0] |= 0x3 << SDW_REG_SHIFT(CDNS_MCP_CMD_COMMAND);
+	data[1] = data[0];
+
+	data[0] |= SDW_SCP_ADDRPAGE1 << SDW_REG_SHIFT(CDNS_MCP_CMD_REG_ADDR_L);
+	data[1] |= SDW_SCP_ADDRPAGE2 << SDW_REG_SHIFT(CDNS_MCP_CMD_REG_ADDR_L);
+
+	data[0] |= msg->addr_page1;
+	data[1] |= msg->addr_page2;
+
+	base = CDNS_MCP_CMD_BASE;
+	cdns_writel(cdns, base, data[0]);
+	base += CDNS_MCP_CMD_WORD_LEN;
+	cdns_writel(cdns, base, data[1]);
+
+	time = wait_for_completion_timeout(&cdns->tx_complete,
+				msecs_to_jiffies(CDNS_TX_TIMEOUT));
+	if (!time) {
+		dev_err(cdns->dev, "SCP Msg trf timed out\n");
+		msg->len = 0;
+		return SDW_CMD_TIMEOUT;
+	}
+
+	/* check response the writes */
+	for (i = 0; i < 2; i++) {
+		if (!(cdns->response_buf[i] & CDNS_MCP_RESP_ACK)) {
+			no_ack = 1;
+			dev_err(cdns->dev, "Program SCP Ack not received");
+			if (cdns->response_buf[i] & CDNS_MCP_RESP_NACK) {
+				nack = 1;
+				dev_err(cdns->dev, "Program SCP NACK received");
+			}
+		}
+	}
+
+	/* For NACK, NO ack, don't return err if we are in Broadcast mode */
+	if (nack) {
+		dev_err(cdns->dev,
+			"SCP_addrpage NACKed for Slave %d", msg->dev_num);
+		return SDW_CMD_FAIL;
+	} else if (no_ack) {
+		dev_dbg(cdns->dev,
+			"SCP_addrpage ignored for Slave %d", msg->dev_num);
+		return SDW_CMD_IGNORED;
+	}
+
+	return SDW_CMD_OK;
+}
+
+static int cdns_prep_msg(struct sdw_cdns *cdns, struct sdw_msg *msg, int *cmd)
+{
+	int ret;
+
+	if (msg->page) {
+		ret = cdns_program_scp_addr(cdns, msg);
+		if (ret) {
+			msg->len = 0;
+			return ret;
+		}
+	}
+
+	switch (msg->flags) {
+	case SDW_MSG_FLAG_READ:
+		*cmd = CDNS_MCP_CMD_READ;
+		break;
+
+	case SDW_MSG_FLAG_WRITE:
+		*cmd = CDNS_MCP_CMD_WRITE;
+		break;
+
+	default:
+		dev_err(cdns->dev, "Invalid msg cmd: %d\n", msg->flags);
+		return -EINVAL;
+	}
+
+	return 0;
+}
+
+enum sdw_command_response
+cdns_xfer_msg(struct sdw_bus *bus, struct sdw_msg *msg)
+{
+	struct sdw_cdns *cdns = bus_to_cdns(bus);
+	int cmd = 0, ret, i;
+
+	ret = cdns_prep_msg(cdns, msg, &cmd);
+	if (ret)
+		return SDW_CMD_FAIL_OTHER;
+
+	for (i = 0; i < msg->len / CDNS_MCP_CMD_LEN; i++) {
+		ret = _cdns_xfer_msg(cdns, msg, cmd, i * CDNS_MCP_CMD_LEN,
+				CDNS_MCP_CMD_LEN, false);
+		if (ret < 0)
+			goto exit;
+	}
+
+	if (!(msg->len % CDNS_MCP_CMD_LEN))
+		goto exit;
+
+	ret = _cdns_xfer_msg(cdns, msg, cmd, i * CDNS_MCP_CMD_LEN,
+			msg->len % CDNS_MCP_CMD_LEN, false);
+
+exit:
+	return ret;
+}
+EXPORT_SYMBOL(cdns_xfer_msg);
+
+enum sdw_command_response
+cdns_xfer_msg_defer(struct sdw_bus *bus,
+		struct sdw_msg *msg, struct sdw_defer *defer)
+{
+	struct sdw_cdns *cdns = bus_to_cdns(bus);
+	int cmd = 0, ret;
+
+	/* for defer only 1 message is supported */
+	if (msg->len > 1)
+		return -ENOTSUPP;
+
+	ret = cdns_prep_msg(cdns, msg, &cmd);
+	if (ret)
+		return SDW_CMD_FAIL_OTHER;
+
+	cdns->defer = defer;
+	cdns->defer->length = msg->len;
+
+	return _cdns_xfer_msg(cdns, msg, cmd, 0, msg->len, true);
+}
+EXPORT_SYMBOL(cdns_xfer_msg_defer);
+
+enum sdw_command_response
+cdns_reset_page_addr(struct sdw_bus *bus, unsigned int dev_num)
+{
+	struct sdw_cdns *cdns = bus_to_cdns(bus);
+	struct sdw_msg msg;
+
+	/* Create dummy message with valid device number */
+	memset(&msg, 0, sizeof(msg));
+	msg.dev_num = dev_num;
+
+	return cdns_program_scp_addr(cdns, &msg);
+}
+EXPORT_SYMBOL(cdns_reset_page_addr);
+
+/*
+ * IRQ handling
+ */
+
+static void cdns_read_response(struct sdw_cdns *cdns)
+{
+	u32 num_resp, cmd_base;
+	int i;
+
+	num_resp = cdns_readl(cdns, CDNS_MCP_FIFOSTAT);
+	num_resp &= CDNS_MCP_RX_FIFO_AVAIL;
+
+	cmd_base = CDNS_MCP_CMD_BASE;
+
+	for (i = 0; i < num_resp; i++) {
+		cdns->response_buf[i] = cdns_readl(cdns, cmd_base);
+		cmd_base += CDNS_MCP_CMD_WORD_LEN;
+	}
+}
+
+static int cdns_update_slave_status(struct sdw_cdns *cdns,
+					u32 slave0, u32 slave1)
+{
+	enum sdw_slave_status status[SDW_MAX_DEVICES + 1];
+	bool is_slave = false;
+	u64 slave, mask;
+	int i, set_status;
+
+	/* combine the two status */
+	slave = ((u64)slave1 << 32) | slave0;
+	memset(status, 0, sizeof(status));
+
+	for (i = 0; i <= SDW_MAX_DEVICES; i++) {
+		mask = (slave >> (i * CDNS_MCP_SLAVE_STATUS_NUM)) &
+				CDNS_MCP_SLAVE_STATUS_BITS;
+		if (!mask)
+			continue;
+
+		is_slave = true;
+		set_status = 0;
+
+		if (mask & CDNS_MCP_SLAVE_INTSTAT_RESERVED) {
+			status[i] = SDW_SLAVE_RESERVED;
+			set_status++;
+		}
+
+		if (mask & CDNS_MCP_SLAVE_INTSTAT_ATTACHED) {
+			status[i] = SDW_SLAVE_ATTACHED;
+			set_status++;
+		}
+
+		if (mask & CDNS_MCP_SLAVE_INTSTAT_ALERT) {
+			status[i] = SDW_SLAVE_ALERT;
+			set_status++;
+		}
+
+		if (mask & CDNS_MCP_SLAVE_INTSTAT_NPRESENT) {
+			status[i] = SDW_SLAVE_UNATTACHED;
+			set_status++;
+		}
+
+		/* first check if Slave reported multiple status */
+		if (set_status > 1) {
+			dev_warn(cdns->dev,
+					"Slave reported multiple Status: %d\n",
+					status[i]);
+			/*
+			 * TODO: we need to reread the status here by
+			 * issuing a PING cmd
+			 */
+		}
+	}
+
+	if (is_slave)
+		return sdw_handle_slave_status(&cdns->bus, status);
+
+	return 0;
+}
+
+/**
+ * sdw_cdns_irq() - Cadence interrupt handler
+ * @irq: irq number
+ * @dev_id: irq context
+ */
+irqreturn_t sdw_cdns_irq(int irq, void *dev_id)
+{
+	struct sdw_cdns *cdns = dev_id;
+	u32 int_status;
+	int ret = IRQ_HANDLED;
+
+	/* Check if the link is up */
+	if (!cdns->link_up)
+		return IRQ_NONE;
+
+	int_status = cdns_readl(cdns, CDNS_MCP_INTSTAT);
+
+	if (!(int_status & CDNS_MCP_INT_IRQ))
+		return IRQ_NONE;
+
+	if (int_status & CDNS_MCP_INT_RX_WL) {
+		cdns_read_response(cdns);
+
+		if (cdns->defer) {
+			cdns_fill_msg_resp(cdns, cdns->defer->msg,
+					cdns->defer->length, 0);
+			complete(&cdns->defer->complete);
+			cdns->defer = NULL;
+		} else
+			complete(&cdns->tx_complete);
+	}
+
+	if (int_status & CDNS_MCP_INT_CTRL_CLASH) {
+
+		/* Slave is driving bit slot during control word */
+		dev_err_ratelimited(cdns->dev, "Bus clash for control word\n");
+		int_status |= CDNS_MCP_INT_CTRL_CLASH;
+	}
+
+	if (int_status & CDNS_MCP_INT_DATA_CLASH) {
+		/*
+		 * Multiple slaves trying to drive bit slot, or issue with
+		 * ownership of data bits or Slave gone bonkers
+		 */
+		dev_err_ratelimited(cdns->dev, "Bus clash for data word\n");
+		int_status |= CDNS_MCP_INT_DATA_CLASH;
+	}
+
+	if (int_status & CDNS_MCP_INT_SLAVE_MASK) {
+		/* Mask the Slave interrupt and wake thread */
+		cdns_updatel(cdns, CDNS_MCP_INTMASK,
+				CDNS_MCP_INT_SLAVE_MASK, 0);
+
+		int_status &= ~CDNS_MCP_INT_SLAVE_MASK;
+		ret = IRQ_WAKE_THREAD;
+	}
+
+	cdns_writel(cdns, CDNS_MCP_INTSTAT, int_status);
+	return ret;
+}
+EXPORT_SYMBOL(sdw_cdns_irq);
+
+/**
+ * sdw_cdns_thread() - Cadence irq thread handler
+ * @irq: irq number
+ * @dev_id: irq context
+ */
+irqreturn_t sdw_cdns_thread(int irq, void *dev_id)
+{
+	struct sdw_cdns *cdns = dev_id;
+	u32 slave0, slave1;
+
+	dev_dbg(cdns->dev, "Slave status change\n");
+
+	slave0 = cdns_readl(cdns, CDNS_MCP_SLAVE_INTSTAT0);
+	slave1 = cdns_readl(cdns, CDNS_MCP_SLAVE_INTSTAT1);
+
+	cdns_update_slave_status(cdns, slave0, slave1);
+	cdns_writel(cdns, CDNS_MCP_SLAVE_INTSTAT0, slave0);
+	cdns_writel(cdns, CDNS_MCP_SLAVE_INTSTAT1, slave1);
+
+	/* clear and unmask Slave interrupt now */
+	cdns_writel(cdns, CDNS_MCP_INTSTAT, CDNS_MCP_INT_SLAVE_MASK);
+	cdns_updatel(cdns, CDNS_MCP_INTMASK,
+			CDNS_MCP_INT_SLAVE_MASK, CDNS_MCP_INT_SLAVE_MASK);
+
+	return IRQ_HANDLED;
+}
+EXPORT_SYMBOL(sdw_cdns_thread);
+
+/*
+ * init routines
+ */
+static int _cdns_enable_interrupt(struct sdw_cdns *cdns)
+{
+	u32 mask;
+
+	cdns_writel(cdns, CDNS_MCP_SLAVE_INTMASK0,
+				CDNS_MCP_SLAVE_INTMASK0_MASK);
+	cdns_writel(cdns, CDNS_MCP_SLAVE_INTMASK1,
+				CDNS_MCP_SLAVE_INTMASK1_MASK);
+
+	mask = CDNS_MCP_INT_SLAVE_RSVD | CDNS_MCP_INT_SLAVE_ALERT |
+		CDNS_MCP_INT_SLAVE_ATTACH | CDNS_MCP_INT_SLAVE_NATTACH |
+		CDNS_MCP_INT_CTRL_CLASH | CDNS_MCP_INT_DATA_CLASH |
+		CDNS_MCP_INT_RX_WL | CDNS_MCP_INT_IRQ | CDNS_MCP_INT_DPINT;
+
+	cdns_writel(cdns, CDNS_MCP_INTMASK, mask);
+
+	return 0;
+}
+
+/**
+ * sdw_cdns_enable_interrupt() - Enable SDW interrupts and update config
+ * @cdns: Cadence instance
+ */
+int sdw_cdns_enable_interrupt(struct sdw_cdns *cdns)
+{
+	int ret;
+
+	_cdns_enable_interrupt(cdns);
+	ret = cdns_clear_bit(cdns, CDNS_MCP_CONFIG_UPDATE,
+			CDNS_MCP_CONFIG_UPDATE_BIT);
+	if (ret < 0)
+		dev_err(cdns->dev, "Config update timedout");
+
+	return ret;
+}
+EXPORT_SYMBOL(sdw_cdns_enable_interrupt);
+
+static int cdns_allocate_pdi(struct sdw_cdns *cdns,
+			struct sdw_cdns_pdi **stream,
+			u32 num, u32 pdi_offset)
+{
+	struct sdw_cdns_pdi *pdi;
+	int i;
+
+	if (!num)
+		return 0;
+
+	pdi = devm_kcalloc(cdns->dev, num, sizeof(*pdi), GFP_KERNEL);
+	if (!pdi)
+		return -ENOMEM;
+
+	for (i = 0; i < num; i++) {
+		pdi[i].num = i + pdi_offset;
+		pdi[i].assigned = false;
+	}
+
+	*stream = pdi;
+	return 0;
+}
+
+/**
+ * sdw_cdns_pdi_init() - PDI initialization routine
+ *
+ * @cdns: Cadence instance
+ * @config: Stream configurations
+ */
+int sdw_cdns_pdi_init(struct sdw_cdns *cdns,
+			struct sdw_cdns_stream_config config)
+{
+	struct sdw_cdns_streams *stream;
+	int offset, i, ret;
+
+	cdns->pcm.num_bd = config.pcm_bd;
+	cdns->pcm.num_in = config.pcm_in;
+	cdns->pcm.num_out = config.pcm_out;
+	cdns->pdm.num_bd = config.pdm_bd;
+	cdns->pdm.num_in = config.pdm_in;
+	cdns->pdm.num_out = config.pdm_out;
+
+	/* Allocate PDIs for PCMs */
+	stream = &cdns->pcm;
+
+	/* First two PDIs are reserved for bulk transfers */
+	stream->num_bd -= CDNS_PCM_PDI_OFFSET;
+	offset = CDNS_PCM_PDI_OFFSET;
+
+	ret = cdns_allocate_pdi(cdns, &stream->bd,
+				stream->num_bd, offset);
+	if (ret)
+		return ret;
+
+	offset += stream->num_bd;
+
+	ret = cdns_allocate_pdi(cdns, &stream->in,
+				stream->num_in, offset);
+	if (ret)
+		return ret;
+
+	offset += stream->num_in;
+
+	ret = cdns_allocate_pdi(cdns, &stream->out,
+				stream->num_out, offset);
+	if (ret)
+		return ret;
+
+	/* Update total number of PCM PDIs */
+	stream->num_pdi = stream->num_bd + stream->num_in + stream->num_out;
+	cdns->num_ports = stream->num_pdi;
+
+	/* Allocate PDIs for PDMs */
+	stream = &cdns->pdm;
+	offset = CDNS_PDM_PDI_OFFSET;
+	ret = cdns_allocate_pdi(cdns, &stream->bd,
+				stream->num_bd, offset);
+	if (ret)
+		return ret;
+
+	offset += stream->num_bd;
+
+	ret = cdns_allocate_pdi(cdns, &stream->in,
+				stream->num_in, offset);
+	if (ret)
+		return ret;
+
+	offset += stream->num_in;
+
+	ret = cdns_allocate_pdi(cdns, &stream->out,
+				stream->num_out, offset);
+	if (ret)
+		return ret;
+
+	/* Update total number of PDM PDIs */
+	stream->num_pdi = stream->num_bd + stream->num_in + stream->num_out;
+	cdns->num_ports += stream->num_pdi;
+
+	cdns->ports = devm_kcalloc(cdns->dev, cdns->num_ports,
+				sizeof(*cdns->ports), GFP_KERNEL);
+	if (!cdns->ports) {
+		ret = -ENOMEM;
+		return ret;
+	}
+
+	for (i = 0; i < cdns->num_ports; i++) {
+		cdns->ports[i].assigned = false;
+		cdns->ports[i].num = i + 1; /* Port 0 reserved for bulk */
+	}
+
+	return 0;
+}
+EXPORT_SYMBOL(sdw_cdns_pdi_init);
+
+/**
+ * sdw_cdns_init() - Cadence initialization
+ * @cdns: Cadence instance
+ */
+int sdw_cdns_init(struct sdw_cdns *cdns)
+{
+	u32 val;
+	int ret;
+
+	/* Exit clock stop */
+	ret = cdns_clear_bit(cdns, CDNS_MCP_CONTROL,
+			CDNS_MCP_CONTROL_CLK_STOP_CLR);
+	if (ret < 0) {
+		dev_err(cdns->dev, "Couldn't exit from clock stop\n");
+		return ret;
+	}
+
+	/* Set clock divider */
+	val = cdns_readl(cdns, CDNS_MCP_CLK_CTRL0);
+	val |= CDNS_DEFAULT_CLK_DIVIDER;
+	cdns_writel(cdns, CDNS_MCP_CLK_CTRL0, val);
+
+	/* Set the default frame shape */
+	cdns_writel(cdns, CDNS_MCP_FRAME_SHAPE_INIT, CDNS_DEFAULT_FRAME_SHAPE);
+
+	/* Set SSP interval to default value */
+	cdns_writel(cdns, CDNS_MCP_SSP_CTRL0, CDNS_DEFAULT_SSP_INTERVAL);
+	cdns_writel(cdns, CDNS_MCP_SSP_CTRL1, CDNS_DEFAULT_SSP_INTERVAL);
+
+	/* Set cmd accept mode */
+	cdns_updatel(cdns, CDNS_MCP_CONTROL, CDNS_MCP_CONTROL_CMD_ACCEPT,
+					CDNS_MCP_CONTROL_CMD_ACCEPT);
+
+	/* Configure mcp config */
+	val = cdns_readl(cdns, CDNS_MCP_CONFIG);
+
+	/* Set Max cmd retry to 15 */
+	val |= CDNS_MCP_CONFIG_MCMD_RETRY;
+
+	/* Set frame delay between PREQ and ping frame to 15 frames */
+	val |= 0xF << SDW_REG_SHIFT(CDNS_MCP_CONFIG_MPREQ_DELAY);
+
+	/* Disable auto bus release */
+	val &= ~CDNS_MCP_CONFIG_BUS_REL;
+
+	/* Disable sniffer mode */
+	val &= ~CDNS_MCP_CONFIG_SNIFFER;
+
+	/* Set cmd mode for Tx and Rx cmds */
+	val &= ~CDNS_MCP_CONFIG_CMD;
+
+	/* Set operation to normal */
+	val &= ~CDNS_MCP_CONFIG_OP;
+	val |= CDNS_MCP_CONFIG_OP_NORMAL;
+
+	cdns_writel(cdns, CDNS_MCP_CONFIG, val);
+
+	return 0;
+}
+EXPORT_SYMBOL(sdw_cdns_init);
+
+int cdns_bus_conf(struct sdw_bus *bus, struct sdw_bus_params *params)
+{
+	struct sdw_cdns *cdns = bus_to_cdns(bus);
+	int mcp_clkctrl_off, mcp_clkctrl;
+	int divider;
+
+	if (!params->curr_dr_freq) {
+		dev_err(cdns->dev, "NULL curr_dr_freq");
+		return -EINVAL;
+	}
+
+	divider	= (params->max_dr_freq / params->curr_dr_freq) - 1;
+
+	if (params->next_bank)
+		mcp_clkctrl_off = CDNS_MCP_CLK_CTRL1;
+	else
+		mcp_clkctrl_off = CDNS_MCP_CLK_CTRL0;
+
+	mcp_clkctrl = cdns_readl(cdns, mcp_clkctrl_off);
+	mcp_clkctrl |= divider;
+	cdns_writel(cdns, mcp_clkctrl_off, mcp_clkctrl);
+
+	return 0;
+}
+EXPORT_SYMBOL(cdns_bus_conf);
+
+static int cdns_port_params(struct sdw_bus *bus,
+		struct sdw_port_params *p_params, unsigned int bank)
+{
+	struct sdw_cdns *cdns = bus_to_cdns(bus);
+	int dpn_config = 0, dpn_config_off;
+
+	if (bank)
+		dpn_config_off = CDNS_DPN_B1_CONFIG(p_params->num);
+	else
+		dpn_config_off = CDNS_DPN_B0_CONFIG(p_params->num);
+
+	dpn_config = cdns_readl(cdns, dpn_config_off);
+
+	dpn_config |= ((p_params->bps - 1) <<
+				SDW_REG_SHIFT(CDNS_DPN_CONFIG_WL));
+	dpn_config |= (p_params->flow_mode <<
+				SDW_REG_SHIFT(CDNS_DPN_CONFIG_PORT_FLOW));
+	dpn_config |= (p_params->data_mode <<
+				SDW_REG_SHIFT(CDNS_DPN_CONFIG_PORT_DAT));
+
+	cdns_writel(cdns, dpn_config_off, dpn_config);
+
+	return 0;
+}
+
+static int cdns_transport_params(struct sdw_bus *bus,
+			struct sdw_transport_params *t_params,
+			enum sdw_reg_bank bank)
+{
+	struct sdw_cdns *cdns = bus_to_cdns(bus);
+	int dpn_offsetctrl = 0, dpn_offsetctrl_off;
+	int dpn_config = 0, dpn_config_off;
+	int dpn_hctrl = 0, dpn_hctrl_off;
+	int num = t_params->port_num;
+	int dpn_samplectrl_off;
+
+	/*
+	 * Note: Only full data port is supported on the Master side for
+	 * both PCM and PDM ports.
+	 */
+
+	if (bank) {
+		dpn_config_off = CDNS_DPN_B1_CONFIG(num);
+		dpn_samplectrl_off = CDNS_DPN_B1_SAMPLE_CTRL(num);
+		dpn_hctrl_off = CDNS_DPN_B1_HCTRL(num);
+		dpn_offsetctrl_off = CDNS_DPN_B1_OFFSET_CTRL(num);
+	} else {
+		dpn_config_off = CDNS_DPN_B0_CONFIG(num);
+		dpn_samplectrl_off = CDNS_DPN_B0_SAMPLE_CTRL(num);
+		dpn_hctrl_off = CDNS_DPN_B0_HCTRL(num);
+		dpn_offsetctrl_off = CDNS_DPN_B0_OFFSET_CTRL(num);
+	}
+
+	dpn_config = cdns_readl(cdns, dpn_config_off);
+
+	dpn_config |= (t_params->blk_grp_ctrl <<
+				SDW_REG_SHIFT(CDNS_DPN_CONFIG_BGC));
+	dpn_config |= (t_params->blk_pkg_mode <<
+				SDW_REG_SHIFT(CDNS_DPN_CONFIG_BPM));
+	cdns_writel(cdns, dpn_config_off, dpn_config);
+
+	dpn_offsetctrl |= (t_params->offset1 <<
+				SDW_REG_SHIFT(CDNS_DPN_OFFSET_CTRL_1));
+	dpn_offsetctrl |= (t_params->offset2 <<
+				SDW_REG_SHIFT(CDNS_DPN_OFFSET_CTRL_2));
+	cdns_writel(cdns, dpn_offsetctrl_off,  dpn_offsetctrl);
+
+	dpn_hctrl |= (t_params->hstart <<
+				SDW_REG_SHIFT(CDNS_DPN_HCTRL_HSTART));
+	dpn_hctrl |= (t_params->hstop << SDW_REG_SHIFT(CDNS_DPN_HCTRL_HSTOP));
+	dpn_hctrl |= (t_params->lane_ctrl <<
+				SDW_REG_SHIFT(CDNS_DPN_HCTRL_LCTRL));
+
+	cdns_writel(cdns, dpn_hctrl_off, dpn_hctrl);
+	cdns_writel(cdns, dpn_samplectrl_off, (t_params->sample_interval - 1));
+
+	return 0;
+}
+
+static int cdns_port_enable(struct sdw_bus *bus,
+		struct sdw_enable_ch *enable_ch, unsigned int bank)
+{
+	struct sdw_cdns *cdns = bus_to_cdns(bus);
+	int dpn_chnen_off, ch_mask;
+
+	if (bank)
+		dpn_chnen_off = CDNS_DPN_B1_CH_EN(enable_ch->port_num);
+	else
+		dpn_chnen_off = CDNS_DPN_B0_CH_EN(enable_ch->port_num);
+
+	ch_mask = enable_ch->ch_mask * enable_ch->enable;
+	cdns_writel(cdns, dpn_chnen_off, ch_mask);
+
+	return 0;
+}
+
+static const struct sdw_master_port_ops cdns_port_ops = {
+	.dpn_set_port_params = cdns_port_params,
+	.dpn_set_port_transport_params = cdns_transport_params,
+	.dpn_port_enable_ch = cdns_port_enable,
+};
+
+/**
+ * sdw_cdns_probe() - Cadence probe routine
+ * @cdns: Cadence instance
+ */
+int sdw_cdns_probe(struct sdw_cdns *cdns)
+{
+	init_completion(&cdns->tx_complete);
+	cdns->bus.port_ops = &cdns_port_ops;
+
+	return 0;
+}
+EXPORT_SYMBOL(sdw_cdns_probe);
+
+int cdns_set_sdw_stream(struct snd_soc_dai *dai,
+		void *stream, bool pcm, int direction)
+{
+	struct sdw_cdns *cdns = snd_soc_dai_get_drvdata(dai);
+	struct sdw_cdns_dma_data *dma;
+
+	dma = kzalloc(sizeof(*dma), GFP_KERNEL);
+	if (!dma)
+		return -ENOMEM;
+
+	if (pcm)
+		dma->stream_type = SDW_STREAM_PCM;
+	else
+		dma->stream_type = SDW_STREAM_PDM;
+
+	dma->bus = &cdns->bus;
+	dma->link_id = cdns->instance;
+
+	dma->stream = stream;
+
+	if (direction == SNDRV_PCM_STREAM_PLAYBACK)
+		dai->playback_dma_data = dma;
+	else
+		dai->capture_dma_data = dma;
+
+	return 0;
+}
+EXPORT_SYMBOL(cdns_set_sdw_stream);
+
+/**
+ * cdns_find_pdi() - Find a free PDI
+ *
+ * @cdns: Cadence instance
+ * @num: Number of PDIs
+ * @pdi: PDI instances
+ *
+ * Find and return a free PDI for a given PDI array
+ */
+static struct sdw_cdns_pdi *cdns_find_pdi(struct sdw_cdns *cdns,
+		unsigned int num, struct sdw_cdns_pdi *pdi)
+{
+	int i;
+
+	for (i = 0; i < num; i++) {
+		if (pdi[i].assigned == true)
+			continue;
+		pdi[i].assigned = true;
+		return &pdi[i];
+	}
+
+	return NULL;
+}
+
+/**
+ * sdw_cdns_config_stream: Configure a stream
+ *
+ * @cdns: Cadence instance
+ * @port: Cadence data port
+ * @ch: Channel count
+ * @dir: Data direction
+ * @pdi: PDI to be used
+ */
+void sdw_cdns_config_stream(struct sdw_cdns *cdns,
+				struct sdw_cdns_port *port,
+				u32 ch, u32 dir, struct sdw_cdns_pdi *pdi)
+{
+	u32 offset, val = 0;
+
+	if (dir == SDW_DATA_DIR_RX)
+		val = CDNS_PORTCTRL_DIRN;
+
+	offset = CDNS_PORTCTRL + port->num * CDNS_PORT_OFFSET;
+	cdns_updatel(cdns, offset, CDNS_PORTCTRL_DIRN, val);
+
+	val = port->num;
+	val |= ((1 << ch) - 1) << SDW_REG_SHIFT(CDNS_PDI_CONFIG_CHANNEL);
+	cdns_writel(cdns, CDNS_PDI_CONFIG(pdi->num), val);
+}
+EXPORT_SYMBOL(sdw_cdns_config_stream);
+
+/**
+ * cdns_get_num_pdi() - Get number of PDIs required
+ *
+ * @cdns: Cadence instance
+ * @pdi: PDI to be used
+ * @num: Number of PDIs
+ * @ch_count: Channel count
+ */
+static int cdns_get_num_pdi(struct sdw_cdns *cdns,
+		struct sdw_cdns_pdi *pdi,
+		unsigned int num, u32 ch_count)
+{
+	int i, pdis = 0;
+
+	for (i = 0; i < num; i++) {
+		if (pdi[i].assigned == true)
+			continue;
+
+		if (pdi[i].ch_count < ch_count)
+			ch_count -= pdi[i].ch_count;
+		else
+			ch_count = 0;
+
+		pdis++;
+
+		if (!ch_count)
+			break;
+	}
+
+	if (ch_count)
+		return 0;
+
+	return pdis;
+}
+
+/**
+ * sdw_cdns_get_stream() - Get stream information
+ *
+ * @cdns: Cadence instance
+ * @stream: Stream to be allocated
+ * @ch: Channel count
+ * @dir: Data direction
+ */
+int sdw_cdns_get_stream(struct sdw_cdns *cdns,
+			struct sdw_cdns_streams *stream,
+			u32 ch, u32 dir)
+{
+	int pdis = 0;
+
+	if (dir == SDW_DATA_DIR_RX)
+		pdis = cdns_get_num_pdi(cdns, stream->in, stream->num_in, ch);
+	else
+		pdis = cdns_get_num_pdi(cdns, stream->out, stream->num_out, ch);
+
+	/* check if we found PDI, else find in bi-directional */
+	if (!pdis)
+		pdis = cdns_get_num_pdi(cdns, stream->bd, stream->num_bd, ch);
+
+	return pdis;
+}
+EXPORT_SYMBOL(sdw_cdns_get_stream);
+
+/**
+ * sdw_cdns_alloc_stream() - Allocate a stream
+ *
+ * @cdns: Cadence instance
+ * @stream: Stream to be allocated
+ * @port: Cadence data port
+ * @ch: Channel count
+ * @dir: Data direction
+ */
+int sdw_cdns_alloc_stream(struct sdw_cdns *cdns,
+			struct sdw_cdns_streams *stream,
+			struct sdw_cdns_port *port, u32 ch, u32 dir)
+{
+	struct sdw_cdns_pdi *pdi = NULL;
+
+	if (dir == SDW_DATA_DIR_RX)
+		pdi = cdns_find_pdi(cdns, stream->num_in, stream->in);
+	else
+		pdi = cdns_find_pdi(cdns, stream->num_out, stream->out);
+
+	/* check if we found a PDI, else find in bi-directional */
+	if (!pdi)
+		pdi = cdns_find_pdi(cdns, stream->num_bd, stream->bd);
+
+	if (!pdi)
+		return -EIO;
+
+	port->pdi = pdi;
+	pdi->l_ch_num = 0;
+	pdi->h_ch_num = ch - 1;
+	pdi->dir = dir;
+	pdi->ch_count = ch;
+
+	return 0;
+}
+EXPORT_SYMBOL(sdw_cdns_alloc_stream);
+
+void sdw_cdns_shutdown(struct snd_pcm_substream *substream,
+					struct snd_soc_dai *dai)
+{
+	struct sdw_cdns_dma_data *dma;
+
+	dma = snd_soc_dai_get_dma_data(dai, substream);
+	if (!dma)
+		return;
+
+	snd_soc_dai_set_dma_data(dai, substream, NULL);
+	kfree(dma);
+}
+EXPORT_SYMBOL(sdw_cdns_shutdown);
+
+MODULE_LICENSE("Dual BSD/GPL");
+MODULE_DESCRIPTION("Cadence Soundwire Library");