i2c: wmt: add platform type VIAI2C_PLAT_WMT

Enumeration variables are added to differentiate
between different platforms.

Acked-by: Wolfram Sang <wsa+renesas@sang-engineering.com>
Signed-off-by: Hans Hu <hanshu-oc@zhaoxin.com>
Signed-off-by: Andi Shyti <andi.shyti@kernel.org>

Author: Hans Hu

drivers/i2c/busses/i2c-viai2c-common.c

@@ -35,7 +35,7 @@ static int viai2c_write(struct viai2c *i2c, struct i2c_msg *pmsg, int last)
 		writew(pmsg->buf[0] & 0xFF, i2c->base + VIAI2C_REG_CDR);
 	}
 
-	if (!(pmsg->flags & I2C_M_NOSTART)) {
+	if (i2c->platform == VIAI2C_PLAT_WMT && !(pmsg->flags & I2C_M_NOSTART)) {
 		val = readw(i2c->base + VIAI2C_REG_CR);
 		val &= ~VIAI2C_CR_TX_END;
 		val |= VIAI2C_CR_CPU_RDY;
@@ -48,7 +48,7 @@ static int viai2c_write(struct viai2c *i2c, struct i2c_msg *pmsg, int last)
 
 	writew(tcr_val, i2c->base + VIAI2C_REG_TCR);
 
-	if (pmsg->flags & I2C_M_NOSTART) {
+	if (i2c->platform == VIAI2C_PLAT_WMT && pmsg->flags & I2C_M_NOSTART) {
 		val = readw(i2c->base + VIAI2C_REG_CR);
 		val |= VIAI2C_CR_CPU_RDY;
 		writew(val, i2c->base + VIAI2C_REG_CR);
@@ -67,7 +67,7 @@ static int viai2c_read(struct viai2c *i2c, struct i2c_msg *pmsg)
 	val = readw(i2c->base + VIAI2C_REG_CR);
 	val &= ~(VIAI2C_CR_TX_END | VIAI2C_CR_RX_END);
 
-	if (!(pmsg->flags & I2C_M_NOSTART))
+	if (i2c->platform == VIAI2C_PLAT_WMT && !(pmsg->flags & I2C_M_NOSTART))
 		val |= VIAI2C_CR_CPU_RDY;
 
 	if (pmsg->len == 1)
@@ -81,7 +81,7 @@ static int viai2c_read(struct viai2c *i2c, struct i2c_msg *pmsg)
 
 	writew(tcr_val, i2c->base + VIAI2C_REG_TCR);
 
-	if (pmsg->flags & I2C_M_NOSTART) {
+	if (i2c->platform == VIAI2C_PLAT_WMT && (pmsg->flags & I2C_M_NOSTART)) {
 		val = readw(i2c->base + VIAI2C_REG_CR);
 		val |= VIAI2C_CR_CPU_RDY;
 		writew(val, i2c->base + VIAI2C_REG_CR);
@@ -102,7 +102,7 @@ int viai2c_xfer(struct i2c_adapter *adap, struct i2c_msg msgs[], int num)
 
 	for (i = 0; ret >= 0 && i < num; i++) {
 		pmsg = &msgs[i];
-		if (!(pmsg->flags & I2C_M_NOSTART)) {
+		if (i2c->platform == VIAI2C_PLAT_WMT && !(pmsg->flags & I2C_M_NOSTART)) {
 			ret = viai2c_wait_bus_not_busy(i2c);
 			if (ret < 0)
 				return ret;
@@ -155,7 +155,7 @@ static int viai2c_irq_xfer(struct viai2c *i2c)
 		}
 
 		if ((i2c->xfered_len + 1) == msg->len) {
-			if (!i2c->last)
+			if (i2c->platform == VIAI2C_PLAT_WMT && !i2c->last)
 				writew(VIAI2C_CR_ENABLE, base + VIAI2C_REG_CR);
 		} else {
 			writew(msg->buf[i2c->xfered_len + 1] & 0xFF, base + VIAI2C_REG_CDR);
@@ -181,7 +181,7 @@ static irqreturn_t viai2c_isr(int irq, void *data)
 	if (status & VIAI2C_ISR_NACK_ADDR)
 		i2c->ret = -EIO;
 
-	if (status & VIAI2C_ISR_SCL_TIMEOUT)
+	if (i2c->platform == VIAI2C_PLAT_WMT && (status & VIAI2C_ISR_SCL_TIMEOUT))
 		i2c->ret = -ETIMEDOUT;
 
 	if (!i2c->ret)
@@ -194,9 +194,10 @@ static irqreturn_t viai2c_isr(int irq, void *data)
 	return IRQ_HANDLED;
 }
 
-int viai2c_init(struct platform_device *pdev, struct viai2c **pi2c)
+int viai2c_init(struct platform_device *pdev, struct viai2c **pi2c, int plat)
 {
 	int err;
+	int irq_flags;
 	struct viai2c *i2c;
 	struct device_node *np = pdev->dev.of_node;
 
@@ -208,12 +209,19 @@ int viai2c_init(struct platform_device *pdev, struct viai2c **pi2c)
 	if (IS_ERR(i2c->base))
 		return PTR_ERR(i2c->base);
 
-	i2c->irq = irq_of_parse_and_map(np, 0);
-	if (!i2c->irq)
-		return -EINVAL;
+	if (plat == VIAI2C_PLAT_WMT) {
+		irq_flags = 0;
+		i2c->irq = irq_of_parse_and_map(np, 0);
+		if (!i2c->irq)
+			return -EINVAL;
+	} else {
+		return dev_err_probe(&pdev->dev, -EINVAL, "wrong platform type\n");
+	}
+
+	i2c->platform = plat;
 
 	err = devm_request_irq(&pdev->dev, i2c->irq, viai2c_isr,
-			       0, pdev->name, i2c);
+			       irq_flags, pdev->name, i2c);
 	if (err)
 		return dev_err_probe(&pdev->dev, err,
 				"failed to request irq %i\n", i2c->irq);

drivers/i2c/busses/i2c-viai2c-common.h

@@ -50,6 +50,10 @@
 
 #define VIAI2C_TIMEOUT		(msecs_to_jiffies(1000))
 
+enum {
+	VIAI2C_PLAT_WMT,
+};
+
 struct viai2c {
 	struct i2c_adapter	adapter;
 	struct completion	complete;
@@ -62,10 +66,11 @@ struct viai2c {
 	struct i2c_msg		*msg;
 	int			ret;
 	bool			last;
+	unsigned int		platform;
 };
 
 int viai2c_wait_bus_not_busy(struct viai2c *i2c);
 int viai2c_xfer(struct i2c_adapter *adap, struct i2c_msg msgs[], int num);
-int viai2c_init(struct platform_device *pdev, struct viai2c **pi2c);
+int viai2c_init(struct platform_device *pdev, struct viai2c **pi2c, int plat);
 
 #endif

drivers/i2c/busses/i2c-viai2c-wmt.c

@@ -80,7 +80,7 @@ static int wmt_i2c_probe(struct platform_device *pdev)
 	int err;
 	u32 clk_rate;
 
-	err = viai2c_init(pdev, &i2c);
+	err = viai2c_init(pdev, &i2c, VIAI2C_PLAT_WMT);
 	if (err)
 		return err;