i2c: designware: add I2C SLAVE support

index c453717b753b..c0e9cf374e2b 100644
@@ -21,17 +21,17 @@
  * ----------------------------------------------------------------------------
  *
  */
+#include <linux/delay.h>
 #include <linux/export.h>
 #include <linux/errno.h>
 #include <linux/err.h>
 #include <linux/i2c.h>
 #include <linux/interrupt.h>
 #include <linux/io.h>
-#include <linux/pm_runtime.h>
-#include <linux/delay.h>
 #include <linux/module.h>
-#include "i2c-designware-core.h"
+#include <linux/pm_runtime.h>
 
+#include "i2c-designware-core.h"
 /*
  * Registers offset
  */

@@ -98,7 +98,7 @@
 
 #define DW_IC_ERR_TX_ABRT	0x1
 
-#define DW_IC_TAR_10BITADDR_MASTER BIT(12)
+#define DW_IC_TAR_10BITADDR_MASTER		BIT(12)
 
 #define DW_IC_COMP_PARAM_1_SPEED_MODE_HIGH	(BIT(2) | BIT(3))
 #define DW_IC_COMP_PARAM_1_SPEED_MODE_MASK	GENMASK(3, 2)

@@ -113,10 +113,10 @@
 #define TIMEOUT			20 /* ms */
 
 /*
- * hardware abort codes from the DW_IC_TX_ABRT_SOURCE register
+ * Hardware abort codes from the DW_IC_TX_ABRT_SOURCE register
  *
- * only expected abort codes are listed here
- * refer to the datasheet for the full list
+ * Only expected abort codes are listed here,
+ * refer to the datasheet for the full list.
  */
 #define ABRT_7B_ADDR_NOACK	0
 #define ABRT_10ADDR1_NOACK	1

@@ -318,7 +318,7 @@ static void i2c_dw_release_lock(struct dw_i2c_dev *dev)
 }
 
 /**
- * i2c_dw_init() - initialize the designware i2c master hardware
+ * i2c_dw_init() - Initialize the designware I2C master hardware
  * @dev: device private data
  *
  * This functions configures and enables the I2C master.

@@ -344,8 +344,8 @@ int i2c_dw_init(struct dw_i2c_dev *dev)
 		/* Configure register access mode 16bit */
 		dev->flags |= ACCESS_16BIT;
 	} else if (reg != DW_IC_COMP_TYPE_VALUE) {
-		dev_err(dev->dev, "Unknown Synopsys component type: "
-			"0x%08x\n", reg);
+		dev_err(dev->dev,
+			"Unknown Synopsys component type: 0x%08x\n", reg);
 		i2c_dw_release_lock(dev);
 		return -ENODEV;
 	}

@@ -355,7 +355,7 @@ int i2c_dw_init(struct dw_i2c_dev *dev)
 	/* Disable the adapter */
 	__i2c_dw_enable_and_wait(dev, false);
 
-	/* set standard and fast speed deviders for high/low periods */
+	/* Set standard and fast speed deviders for high/low periods */
 
 	sda_falling_time = dev->sda_falling_time ?: 300; /* ns */
 	scl_falling_time = dev->scl_falling_time ?: 300; /* ns */

@@ -444,7 +444,7 @@ int i2c_dw_init(struct dw_i2c_dev *dev)
 	dw_writel(dev, dev->tx_fifo_depth / 2, DW_IC_TX_TL);
 	dw_writel(dev, 0, DW_IC_RX_TL);
 
-	/* configure the i2c master */
+	/* Configure the I2C master */
 	dw_writel(dev, dev->master_cfg , DW_IC_CON);
 
 	i2c_dw_release_lock(dev);

@@ -480,7 +480,7 @@ static void i2c_dw_xfer_init(struct dw_i2c_dev *dev)
 	/* Disable the adapter */
 	__i2c_dw_enable_and_wait(dev, false);
 
-	/* if the slave address is ten bit address, enable 10BITADDR */
+	/* If the slave address is ten bit address, enable 10BITADDR */
 	ic_con = dw_readl(dev, DW_IC_CON);
 	if (msgs[dev->msg_write_idx].flags & I2C_M_TEN) {
 		ic_con |= DW_IC_CON_10BITADDR_MASTER;

@@ -503,7 +503,7 @@ static void i2c_dw_xfer_init(struct dw_i2c_dev *dev)
 	 */
 	dw_writel(dev, msgs[dev->msg_write_idx].addr | ic_tar, DW_IC_TAR);
 
-	/* enforce disabled interrupts (due to HW issues) */
+	/* Enforce disabled interrupts (due to HW issues) */
 	i2c_dw_disable_int(dev);
 
 	/* Enable the adapter */

@@ -537,9 +537,9 @@ i2c_dw_xfer_msg(struct dw_i2c_dev *dev)
 		u32 flags = msgs[dev->msg_write_idx].flags;
 
 		/*
-		 * if target address has changed, we need to
-		 * reprogram the target address in the i2c
-		 * adapter when we are done with this transfer
+		 * If target address has changed, we need to
+		 * reprogram the target address in the I2C
+		 * adapter when we are done with this transfer.
 		 */
 		if (msgs[dev->msg_write_idx].addr != addr) {
 			dev_err(dev->dev,

@@ -599,7 +599,7 @@ i2c_dw_xfer_msg(struct dw_i2c_dev *dev)
 
 			if (msgs[dev->msg_write_idx].flags & I2C_M_RD) {
 
-				/* avoid rx buffer overrun */
+				/* Avoid rx buffer overrun */
 				if (dev->rx_outstanding >= dev->rx_fifo_depth)
 					break;
 

@@ -728,7 +728,7 @@ static int i2c_dw_handle_tx_abort(struct dw_i2c_dev *dev)
 }
 
 /*
- * Prepare controller for a transaction and call i2c_dw_xfer_msg
+ * Prepare controller for a transaction and call i2c_dw_xfer_msg.
  */
 static int
 i2c_dw_xfer(struct i2c_adapter *adap, struct i2c_msg msgs[], int num)

@@ -759,10 +759,10 @@ i2c_dw_xfer(struct i2c_adapter *adap, struct i2c_msg msgs[], int num)
 	if (ret < 0)
 		goto done;
 
-	/* start the transfers */
+	/* Start the transfers */
 	i2c_dw_xfer_init(dev);
 
-	/* wait for tx to complete */
+	/* Wait for tx to complete */
 	if (!wait_for_completion_timeout(&dev->cmd_complete, adap->timeout)) {
 		dev_err(dev->dev, "controller timed out\n");
 		/* i2c_dw_init implicitly disables the adapter */

@@ -786,7 +786,7 @@ i2c_dw_xfer(struct i2c_adapter *adap, struct i2c_msg msgs[], int num)
 		goto done;
 	}
 
-	/* no error */
+	/* No error */
 	if (likely(!dev->cmd_err && !dev->status)) {
 		ret = num;
 		goto done;

@@ -821,8 +821,8 @@ static u32 i2c_dw_func(struct i2c_adapter *adap)
 }
 
 static const struct i2c_algorithm i2c_dw_algo = {
-	.master_xfer	= i2c_dw_xfer,
-	.functionality	= i2c_dw_func,
+	.master_xfer = i2c_dw_xfer,
+	.functionality = i2c_dw_func,
 };
 
 static u32 i2c_dw_read_clear_intrbits(struct dw_i2c_dev *dev)

@@ -903,7 +903,7 @@ static irqreturn_t i2c_dw_isr(int this_irq, void *dev_id)
 
 		/*
 		 * Anytime TX_ABRT is set, the contents of the tx/rx
-		 * buffers are flushed.  Make sure to skip them.
+		 * buffers are flushed. Make sure to skip them.
 		 */
 		dw_writel(dev, 0, DW_IC_INTR_MASK);
 		goto tx_aborted;

@@ -925,7 +925,7 @@ static irqreturn_t i2c_dw_isr(int this_irq, void *dev_id)
 	if ((stat & (DW_IC_INTR_TX_ABRT | DW_IC_INTR_STOP_DET)) || dev->msg_err)
 		complete(&dev->cmd_complete);
 	else if (unlikely(dev->flags & ACCESS_INTR_MASK)) {
-		/* workaround to trigger pending interrupt */
+		/* Workaround to trigger pending interrupt */
 		stat = dw_readl(dev, DW_IC_INTR_MASK);
 		i2c_dw_disable_int(dev);
 		dw_writel(dev, stat, DW_IC_INTR_MASK);

@@ -961,13 +961,13 @@ int i2c_dw_probe(struct dw_i2c_dev *dev)
 {
 	struct i2c_adapter *adap = &dev->adapter;
 	unsigned long irq_flags;
-	int r;
+	int ret;
 
 	init_completion(&dev->cmd_complete);
 
-	r = i2c_dw_init(dev);
-	if (r)
-		return r;
+	ret = i2c_dw_init(dev);
+	if (ret)
+		return ret;
 
 	snprintf(adap->name, sizeof(adap->name),
 		 "Synopsys DesignWare I2C adapter");

@@ -984,12 +984,12 @@ int i2c_dw_probe(struct dw_i2c_dev *dev)
 	}
 
 	i2c_dw_disable_int(dev);
-	r = devm_request_irq(dev->dev, dev->irq, i2c_dw_isr, irq_flags,
+	ret = devm_request_irq(dev->dev, dev->irq, i2c_dw_isr, irq_flags,
 			     dev_name(dev->dev), dev);
-	if (r) {
+	if (ret) {
 		dev_err(dev->dev, "failure requesting irq %i: %d\n",
-			dev->irq, r);
-		return r;
+			dev->irq, ret);
+		return ret;
 	}
 
 	/*

@@ -999,12 +999,12 @@ int i2c_dw_probe(struct dw_i2c_dev *dev)
 	 * registered I2C slaves that do I2C transfers in their probe.
 	 */
 	pm_runtime_get_noresume(dev->dev);
-	r = i2c_add_numbered_adapter(adap);
-	if (r)
-		dev_err(dev->dev, "failure adding adapter: %d\n", r);
+	ret = i2c_add_numbered_adapter(adap);
+	if (ret)
+		dev_err(dev->dev, "failure adding adapter: %d\n", ret);
 	pm_runtime_put_noidle(dev->dev);
 
-	return r;
+	return ret;
 }
 EXPORT_SYMBOL_GPL(i2c_dw_probe);
 

index a7cf429daf60..fe9b66898a72 100644
@@ -49,7 +49,7 @@
  * @cmd_complete: tx completion indicator
  * @clk: input reference clock
  * @cmd_err: run time hadware error code
- * @msgs: points to an array of messages currently being transfered
+ * @msgs: points to an array of messages currently being transferred
  * @msgs_num: the number of elements in msgs
  * @msg_write_idx: the element index of the current tx message in the msgs
  *	array

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index c0e9cf374e2b..ce5d11102070 100644
@@ -87,10 +87,10 @@
 #define DW_IC_INTR_GEN_CALL	0x800
 
 #define DW_IC_INTR_DEFAULT_MASK		(DW_IC_INTR_RX_FULL | \
-					 DW_IC_INTR_TX_EMPTY | \
 					 DW_IC_INTR_TX_ABRT | \
 					 DW_IC_INTR_STOP_DET)
-
+#define DW_IC_INTR_MASTER_MASK		(DW_IC_INTR_DEFAULT_MASK | \
+					 DW_IC_INTR_TX_EMPTY)
 #define DW_IC_STATUS_ACTIVITY	0x1
 
 #define DW_IC_SDA_HOLD_RX_SHIFT		16

@@ -202,6 +202,16 @@ static void dw_writel(struct dw_i2c_dev *dev, u32 b, int offset)
 	}
 }
 
+static void i2c_dw_configure_fifo_master(struct dw_i2c_dev *dev)
+{
+	/* Configure Tx/Rx FIFO threshold levels */
+	dw_writel(dev, dev->tx_fifo_depth / 2, DW_IC_TX_TL);
+	dw_writel(dev, 0, DW_IC_RX_TL);
+
+	/* Configure the I2C master */
+	dw_writel(dev, dev->master_cfg, DW_IC_CON);
+}
+
 static u32
 i2c_dw_scl_hcnt(u32 ic_clk, u32 tSYMBOL, u32 tf, int cond, int offset)
 {

@@ -440,13 +450,7 @@ int i2c_dw_init(struct dw_i2c_dev *dev)
 			"Hardware too old to adjust SDA hold time.\n");
 	}
 
-	/* Configure Tx/Rx FIFO threshold levels */
-	dw_writel(dev, dev->tx_fifo_depth / 2, DW_IC_TX_TL);
-	dw_writel(dev, 0, DW_IC_RX_TL);
-
-	/* Configure the I2C master */
-	dw_writel(dev, dev->master_cfg , DW_IC_CON);
-
+	i2c_dw_configure_fifo_master(dev);
 	i2c_dw_release_lock(dev);
 
 	return 0;

@@ -511,7 +515,7 @@ static void i2c_dw_xfer_init(struct dw_i2c_dev *dev)
 
 	/* Clear and enable interrupts */
 	dw_readl(dev, DW_IC_CLR_INTR);
-	dw_writel(dev, DW_IC_INTR_DEFAULT_MASK, DW_IC_INTR_MASK);
+	dw_writel(dev, DW_IC_INTR_MASTER_MASK, DW_IC_INTR_MASK);
 }
 
 /*

@@ -531,7 +535,7 @@ i2c_dw_xfer_msg(struct dw_i2c_dev *dev)
 	u8 *buf = dev->tx_buf;
 	bool need_restart = false;
 
-	intr_mask = DW_IC_INTR_DEFAULT_MASK;
+	intr_mask = DW_IC_INTR_MASTER_MASK;
 
 	for (; dev->msg_write_idx < dev->msgs_num; dev->msg_write_idx++) {
 		u32 flags = msgs[dev->msg_write_idx].flags;

@@ -881,22 +885,14 @@ static u32 i2c_dw_read_clear_intrbits(struct dw_i2c_dev *dev)
 }
 
 /*
- * Interrupt service routine. This gets called whenever an I2C interrupt
+ * Interrupt service routine. This gets called whenever an I2C master interrupt
  * occurs.
  */
-static irqreturn_t i2c_dw_isr(int this_irq, void *dev_id)
+static int i2c_dw_irq_handler_master(struct dw_i2c_dev *dev)
 {
-	struct dw_i2c_dev *dev = dev_id;
-	u32 stat, enabled;
-
-	enabled = dw_readl(dev, DW_IC_ENABLE);
-	stat = dw_readl(dev, DW_IC_RAW_INTR_STAT);
-	dev_dbg(dev->dev, "%s: enabled=%#x stat=%#x\n", __func__, enabled, stat);
-	if (!enabled || !(stat & ~DW_IC_INTR_ACTIVITY))
-		return IRQ_NONE;
+	u32 stat;
 
 	stat = i2c_dw_read_clear_intrbits(dev);
-
 	if (stat & DW_IC_INTR_TX_ABRT) {
 		dev->cmd_err |= DW_IC_ERR_TX_ABRT;
 		dev->status = STATUS_IDLE;

@@ -931,6 +927,22 @@ static irqreturn_t i2c_dw_isr(int this_irq, void *dev_id)
 		dw_writel(dev, stat, DW_IC_INTR_MASK);
 	}
 
+	return 0;
+}
+
+static irqreturn_t i2c_dw_isr(int this_irq, void *dev_id)
+{
+	struct dw_i2c_dev *dev = dev_id;
+	u32 stat, enabled;
+
+	enabled = dw_readl(dev, DW_IC_ENABLE);
+	stat = dw_readl(dev, DW_IC_RAW_INTR_STAT);
+	dev_dbg(dev->dev, "enabled=%#x stat=%#x\n", enabled, stat);
+	if (!enabled || !(stat & ~DW_IC_INTR_ACTIVITY))
+		return IRQ_NONE;
+
+	i2c_dw_irq_handler_master(dev);
+
 	return IRQ_HANDLED;
 }
 

index 972001c01bbf..06205bd39d7e 100644
@@ -168,6 +168,23 @@ static inline int dw_i2c_acpi_configure(struct platform_device *pdev)
 }
 #endif
 
+static void i2c_dw_configure_master(struct dw_i2c_dev *dev)
+{
+	dev->master_cfg = DW_IC_CON_MASTER | DW_IC_CON_SLAVE_DISABLE |
+			  DW_IC_CON_RESTART_EN;
+
+	switch (dev->clk_freq) {
+	case 100000:
+		dev->master_cfg |= DW_IC_CON_SPEED_STD;
+		break;
+	case 3400000:
+		dev->master_cfg |= DW_IC_CON_SPEED_HIGH;
+		break;
+	default:
+		dev->master_cfg |= DW_IC_CON_SPEED_FAST;
+	}
+}
+
 static int i2c_dw_plat_prepare_clk(struct dw_i2c_dev *i_dev, bool prepare)
 {
 	if (IS_ERR(i_dev->clk))

@@ -283,19 +300,7 @@ static int dw_i2c_plat_probe(struct platform_device *pdev)
 
 	dev->functionality = I2C_FUNC_10BIT_ADDR | DW_IC_DEFAULT_FUNCTIONALITY;
 
-	dev->master_cfg = DW_IC_CON_MASTER | DW_IC_CON_SLAVE_DISABLE |
-			  DW_IC_CON_RESTART_EN;
-
-	switch (dev->clk_freq) {
-	case 100000:
-		dev->master_cfg |= DW_IC_CON_SPEED_STD;
-		break;
-	case 3400000:
-		dev->master_cfg |= DW_IC_CON_SPEED_HIGH;
-		break;
-	default:
-		dev->master_cfg |= DW_IC_CON_SPEED_FAST;
-	}
+	i2c_dw_configure_master(dev);
 
 	dev->clk = devm_clk_get(&pdev->dev, NULL);
 	if (!i2c_dw_plat_prepare_clk(dev, true)) {

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index ed485b69b449..b582a5f2fb94 100644
@@ -187,16 +187,18 @@ static struct dw_pci_controller dw_pci_controllers[] = {
 static int i2c_dw_pci_suspend(struct device *dev)
 {
 	struct pci_dev *pdev = to_pci_dev(dev);
+	struct dw_i2c_dev *i_dev = pci_get_drvdata(pdev);
+	i_dev->disable(i_dev);
 
-	i2c_dw_disable(pci_get_drvdata(pdev));
 	return 0;
 }
 
 static int i2c_dw_pci_resume(struct device *dev)
 {
 	struct pci_dev *pdev = to_pci_dev(dev);
+	struct dw_i2c_dev *i_dev = pci_get_drvdata(pdev);
 
-	return i2c_dw_init(pci_get_drvdata(pdev));
+	return i_dev->init(i_dev);
 }
 #endif
 

@@ -296,7 +298,7 @@ static void i2c_dw_pci_remove(struct pci_dev *pdev)
 {
 	struct dw_i2c_dev *dev = pci_get_drvdata(pdev);
 
-	i2c_dw_disable(dev);
+	dev->disable(dev);
 	pm_runtime_forbid(&pdev->dev);
 	pm_runtime_get_noresume(&pdev->dev);
 

index 06205bd39d7e..ab7a4314a91a 100644
@@ -352,7 +352,7 @@ static int dw_i2c_plat_remove(struct platform_device *pdev)
 
 	i2c_del_adapter(&dev->adapter);
 
-	i2c_dw_disable(dev);
+	dev->disable(dev);
 
 	pm_runtime_dont_use_autosuspend(&pdev->dev);
 	pm_runtime_put_sync(&pdev->dev);

@@ -396,7 +396,7 @@ static int dw_i2c_plat_suspend(struct device *dev)
 	struct platform_device *pdev = to_platform_device(dev);
 	struct dw_i2c_dev *i_dev = platform_get_drvdata(pdev);
 
-	i2c_dw_disable(i_dev);
+	i_dev->disable(i_dev);
 	i2c_dw_plat_prepare_clk(i_dev, false);
 
 	return 0;

@@ -408,7 +408,7 @@ static int dw_i2c_plat_resume(struct device *dev)
 	struct dw_i2c_dev *i_dev = platform_get_drvdata(pdev);
 
 	i2c_dw_plat_prepare_clk(i_dev, true);
-	i2c_dw_init(i_dev);
+	i_dev->init(i_dev);
 
 	return 0;
 }

index 81b46c8529fa..dc20ef079fc1 100644
@@ -1,5 +1,5 @@
 /*
- * Synopsys DesignWare I2C adapter driver (master only).
+ * Synopsys DesignWare I2C adapter driver.
  *
  * Based on the TI DAVINCI I2C adapter driver.
  *

@@ -37,15 +37,20 @@
 #define DW_IC_CON_SPEED_FAST		0x4
 #define DW_IC_CON_SPEED_HIGH		0x6
 #define DW_IC_CON_SPEED_MASK		0x6
+#define DW_IC_CON_10BITADDR_SLAVE		0x8
 #define DW_IC_CON_10BITADDR_MASTER	0x10
 #define DW_IC_CON_RESTART_EN		0x20
 #define DW_IC_CON_SLAVE_DISABLE		0x40
+#define DW_IC_CON_STOP_DET_IFADDRESSED		0x80
+#define DW_IC_CON_TX_EMPTY_CTRL		0x100
+#define DW_IC_CON_RX_FIFO_FULL_HLD_CTRL		0x200
 
 /*
  * Registers offset
  */
 #define DW_IC_CON		0x0
 #define DW_IC_TAR		0x4
+#define DW_IC_SAR		0x8
 #define DW_IC_DATA_CMD		0x10
 #define DW_IC_SS_SCL_HCNT	0x14
 #define DW_IC_SS_SCL_LCNT	0x18

@@ -76,6 +81,7 @@
 #define DW_IC_SDA_HOLD		0x7c
 #define DW_IC_TX_ABRT_SOURCE	0x80
 #define DW_IC_ENABLE_STATUS	0x9c
+#define DW_IC_CLR_RESTART_DET	0xa8
 #define DW_IC_COMP_PARAM_1	0xf4
 #define DW_IC_COMP_VERSION	0xf8
 #define DW_IC_SDA_HOLD_MIN_VERS	0x3131312A

@@ -94,15 +100,22 @@
 #define DW_IC_INTR_STOP_DET	0x200
 #define DW_IC_INTR_START_DET	0x400
 #define DW_IC_INTR_GEN_CALL	0x800
+#define DW_IC_INTR_RESTART_DET	0x1000
 
 #define DW_IC_INTR_DEFAULT_MASK		(DW_IC_INTR_RX_FULL | \
 					 DW_IC_INTR_TX_ABRT | \
 					 DW_IC_INTR_STOP_DET)
 #define DW_IC_INTR_MASTER_MASK		(DW_IC_INTR_DEFAULT_MASK | \
 					 DW_IC_INTR_TX_EMPTY)
+#define DW_IC_INTR_SLAVE_MASK		(DW_IC_INTR_DEFAULT_MASK | \
+					 DW_IC_INTR_RX_DONE | \
+					 DW_IC_INTR_RX_UNDER | \
+					 DW_IC_INTR_RD_REQ)
+
 #define DW_IC_STATUS_ACTIVITY		0x1
 #define DW_IC_STATUS_TFE		BIT(2)
 #define DW_IC_STATUS_MASTER_ACTIVITY	BIT(5)
+#define DW_IC_STATUS_SLAVE_ACTIVITY	BIT(6)
 
 #define DW_IC_SDA_HOLD_RX_SHIFT		16
 #define DW_IC_SDA_HOLD_RX_MASK		GENMASK(23, DW_IC_SDA_HOLD_RX_SHIFT)

@@ -115,7 +128,7 @@
 #define DW_IC_COMP_PARAM_1_SPEED_MODE_MASK	GENMASK(3, 2)
 
 /*
- * Status codes
+ * status codes
  */
 #define STATUS_IDLE			0x0
 #define STATUS_WRITE_IN_PROGRESS	0x1

@@ -124,6 +137,12 @@
 #define TIMEOUT			20 /* ms */
 
 /*
+ * operation modes
+ */
+#define DW_IC_MASTER		0
+#define DW_IC_SLAVE		1
+
+/*
  * Hardware abort codes from the DW_IC_TX_ABRT_SOURCE register
  *
  * Only expected abort codes are listed here

@@ -140,6 +159,9 @@
 #define ABRT_10B_RD_NORSTRT	10
 #define ABRT_MASTER_DIS		11
 #define ARB_LOST		12
+#define ABRT_SLAVE_FLUSH_TXFIFO	13
+#define ABRT_SLAVE_ARBLOST	14
+#define ABRT_SLAVE_RD_INTX	15
 
 #define DW_IC_TX_ABRT_7B_ADDR_NOACK	(1UL << ABRT_7B_ADDR_NOACK)
 #define DW_IC_TX_ABRT_10ADDR1_NOACK	(1UL << ABRT_10ADDR1_NOACK)

@@ -152,6 +174,9 @@
 #define DW_IC_TX_ABRT_10B_RD_NORSTRT	(1UL << ABRT_10B_RD_NORSTRT)
 #define DW_IC_TX_ABRT_MASTER_DIS	(1UL << ABRT_MASTER_DIS)
 #define DW_IC_TX_ARB_LOST		(1UL << ARB_LOST)
+#define DW_IC_RX_ABRT_SLAVE_RD_INTX	(1UL << ABRT_SLAVE_RD_INTX)
+#define DW_IC_RX_ABRT_SLAVE_ARBLOST	(1UL << ABRT_SLAVE_ARBLOST)
+#define DW_IC_RX_ABRT_SLAVE_FLUSH_TXFIFO	(1UL << ABRT_SLAVE_FLUSH_TXFIFO)
 
 #define DW_IC_TX_ABRT_NOACK		(DW_IC_TX_ABRT_7B_ADDR_NOACK | \
 					 DW_IC_TX_ABRT_10ADDR1_NOACK | \

@@ -166,6 +191,7 @@
  * @base: IO registers pointer
  * @cmd_complete: tx completion indicator
  * @clk: input reference clock
+ * @slave: represent an I2C slave device
  * @cmd_err: run time hadware error code
  * @msgs: points to an array of messages currently being transferred
  * @msgs_num: the number of elements in msgs

@@ -182,6 +208,7 @@
  * @abort_source: copy of the TX_ABRT_SOURCE register
  * @irq: interrupt number for the i2c master
  * @adapter: i2c subsystem adapter node
+ * @slave_cfg: configuration for the slave device
  * @tx_fifo_depth: depth of the hardware tx fifo
  * @rx_fifo_depth: depth of the hardware rx fifo
  * @rx_outstanding: current master-rx elements in tx fifo

@@ -212,6 +239,7 @@ struct dw_i2c_dev {
 	struct completion	cmd_complete;
 	struct clk		*clk;
 	struct reset_control	*rst;
+	struct i2c_client		*slave;
 	u32			(*get_clk_rate_khz) (struct dw_i2c_dev *dev);
 	struct dw_pci_controller *controller;
 	int			cmd_err;

@@ -231,6 +259,7 @@ struct dw_i2c_dev {
 	struct i2c_adapter	adapter;
 	u32			functionality;
 	u32			master_cfg;
+	u32			slave_cfg;
 	unsigned int		tx_fifo_depth;
 	unsigned int		rx_fifo_depth;
 	int			rx_outstanding;

index 98b64e4f5977..fcd9d6bb8897 100644
@@ -56,6 +56,12 @@ static char *abort_sources[] = {
 		"trying to use disabled adapter",
 	[ARB_LOST] =
 		"lost arbitration",
+	[ABRT_SLAVE_FLUSH_TXFIFO] =
+		"read command so flush old data in the TX FIFO",
+	[ABRT_SLAVE_ARBLOST] =
+		"slave lost the bus while transmitting data to a remote master",
+	[ABRT_SLAVE_RD_INTX] =
+		"incorrect slave-transmitter mode configuration",
 };
 
 u32 dw_readl(struct dw_i2c_dev *dev, int offset)

index dc20ef079fc1..8c6fc8384b1e 100644
@@ -305,9 +305,11 @@ u32 i2c_dw_func(struct i2c_adapter *adap);
 void i2c_dw_disable(struct dw_i2c_dev *dev);
 void i2c_dw_disable_int(struct dw_i2c_dev *dev);
 int i2c_dw_init(struct dw_i2c_dev *dev);
+int i2c_dw_init_slave(struct dw_i2c_dev *dev);
 
 extern u32 i2c_dw_read_comp_param(struct dw_i2c_dev *dev);
 extern int i2c_dw_probe(struct dw_i2c_dev *dev);
+extern int i2c_dw_probe_slave(struct dw_i2c_dev *dev);
 
 #if IS_ENABLED(CONFIG_I2C_DESIGNWARE_BAYTRAIL)
 extern int i2c_dw_probe_lock_support(struct dw_i2c_dev *dev);

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index 8c6fc8384b1e..944af016eac0 100644
@@ -228,6 +228,7 @@
  * @disable: function to disable the controller
  * @disable_int: function to disable all interrupts
  * @init: function to initialize the I2C hardware
+ * @mode: operation mode - DW_IC_MASTER or DW_IC_SLAVE
  * 
  * HCNT and LCNT parameters can be used if the platform knows more accurate
  * values than the one computed based only on the input clock frequency.

@@ -282,6 +283,7 @@ struct dw_i2c_dev {
 	void			(*disable)(struct dw_i2c_dev *dev);
 	void			(*disable_int)(struct dw_i2c_dev *dev);
 	int			(*init)(struct dw_i2c_dev *dev);
+	int			mode;
 };
 
 #define ACCESS_SWAP		0x00000001

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