i2c: rcar: refactor bus state machine

Remove the seperate functions and use designated constants. As readable
but less overhead.
Signed-off-by: Wolfram Sang <wsa+renesas@sang-engineering.com>
Acked-by: Kuninori Morimoto <kuninori.morimoto.gx@renesas.com>
Acked-by: Geert Uytterhoeven <geert@linux-m68k.org>
Signed-off-by: Wolfram Sang <wsa@the-dreams.de>

drivers/i2c/busses/i2c-rcar.c

@@ -79,11 +79,9 @@
 #define MATE	(1 << 0)	/* address sent irq en */
 
 
-enum {
-	RCAR_BUS_PHASE_ADDR,
-	RCAR_BUS_PHASE_DATA,
-	RCAR_BUS_PHASE_STOP,
-};
+#define RCAR_BUS_PHASE_START	(MDBS | MIE | ESG)
+#define RCAR_BUS_PHASE_DATA	(MDBS | MIE)
+#define RCAR_BUS_PHASE_STOP	(MDBS | MIE | FSB)
 
 enum {
 	RCAR_IRQ_CLOSE,
@@ -204,21 +202,6 @@ static int rcar_i2c_bus_barrier(struct rcar_i2c_priv *priv)
 	return -EBUSY;
 }
 
-static void rcar_i2c_bus_phase(struct rcar_i2c_priv *priv, int phase)
-{
-	switch (phase) {
-	case RCAR_BUS_PHASE_ADDR:
-		rcar_i2c_write(priv, ICMCR, MDBS | MIE | ESG);
-		break;
-	case RCAR_BUS_PHASE_DATA:
-		rcar_i2c_write(priv, ICMCR, MDBS | MIE);
-		break;
-	case RCAR_BUS_PHASE_STOP:
-		rcar_i2c_write(priv, ICMCR, MDBS | MIE | FSB);
-		break;
-	}
-}
-
 /*
  *		clock function
  */
@@ -328,7 +311,7 @@ static int rcar_i2c_recv(struct rcar_i2c_priv *priv)
 {
 	rcar_i2c_set_addr(priv, 1);
 	rcar_i2c_status_clear(priv);
-	rcar_i2c_bus_phase(priv, RCAR_BUS_PHASE_ADDR);
+	rcar_i2c_write(priv, ICMCR, RCAR_BUS_PHASE_START);
 	rcar_i2c_irq_mask(priv, RCAR_IRQ_OPEN_FOR_RECV);
 
 	return 0;
@@ -347,7 +330,7 @@ static int rcar_i2c_send(struct rcar_i2c_priv *priv)
 
 	rcar_i2c_set_addr(priv, 0);
 	rcar_i2c_status_clear(priv);
-	rcar_i2c_bus_phase(priv, RCAR_BUS_PHASE_ADDR);
+	rcar_i2c_write(priv, ICMCR, RCAR_BUS_PHASE_START);
 	rcar_i2c_irq_mask(priv, RCAR_IRQ_OPEN_FOR_SEND);
 
 	return 0;
@@ -376,7 +359,7 @@ static int rcar_i2c_irq_send(struct rcar_i2c_priv *priv, u32 msr)
 	 * goto data phase.
 	 */
 	if (msr & MAT)
-		rcar_i2c_bus_phase(priv, RCAR_BUS_PHASE_DATA);
+		rcar_i2c_write(priv, ICMCR, RCAR_BUS_PHASE_DATA);
 
 	if (priv->pos < msg->len) {
 		/*
@@ -404,7 +387,7 @@ static int rcar_i2c_irq_send(struct rcar_i2c_priv *priv, u32 msr)
 			 * prepare stop condition here.
 			 * ID_DONE will be set on STOP irq.
 			 */
-			rcar_i2c_bus_phase(priv, RCAR_BUS_PHASE_STOP);
+			rcar_i2c_write(priv, ICMCR, RCAR_BUS_PHASE_STOP);
 		else
 			/*
 			 * If current msg is _NOT_ last msg,
@@ -452,9 +435,9 @@ static int rcar_i2c_irq_recv(struct rcar_i2c_priv *priv, u32 msr)
 	 * otherwise, go to DATA phase.
 	 */
 	if (priv->pos + 1 >= msg->len)
-		rcar_i2c_bus_phase(priv, RCAR_BUS_PHASE_STOP);
+		rcar_i2c_write(priv, ICMCR, RCAR_BUS_PHASE_STOP);
 	else
-		rcar_i2c_bus_phase(priv, RCAR_BUS_PHASE_DATA);
+		rcar_i2c_write(priv, ICMCR, RCAR_BUS_PHASE_DATA);
 
 	rcar_i2c_recv_restart(priv);
 
@@ -502,7 +485,7 @@ static irqreturn_t rcar_i2c_irq(int irq, void *ptr)
 		dev_dbg(dev, "Nack\n");
 
 		/* go to stop phase */
-		rcar_i2c_bus_phase(priv, RCAR_BUS_PHASE_STOP);
+		rcar_i2c_write(priv, ICMCR, RCAR_BUS_PHASE_STOP);
 		rcar_i2c_irq_mask(priv, RCAR_IRQ_OPEN_FOR_STOP);
 		rcar_i2c_flags_set(priv, ID_NACK);
 		goto out;