i2c: zynq: Add support for the second i2c controller

Initialize the second i2c controller.

Signed-off-by: Michael Burr <michael.burr@logicpd.com>
Signed-off-by: Michal Simek <michal.simek@xilinx.com>

drivers/i2c/zynq_i2c.c

@@ -64,19 +64,21 @@ struct zynq_i2c_registers {
 #define ZYNQ_I2C_FIFO_DEPTH		16
 #define ZYNQ_I2C_TRANSFERT_SIZE_MAX	255 /* Controller transfer limit */
 
-#if defined(CONFIG_ZYNQ_I2C0)
-# define ZYNQ_I2C_BASE	ZYNQ_I2C_BASEADDR0
-#else
-# define ZYNQ_I2C_BASE	ZYNQ_I2C_BASEADDR1
-#endif
-
-static struct zynq_i2c_registers *zynq_i2c =
-	(struct zynq_i2c_registers *)ZYNQ_I2C_BASE;
+static struct zynq_i2c_registers *i2c_select(struct i2c_adapter *adap)
+{
+	return adap->hwadapnr ?
+		/* Zynq PS I2C1 */
+		(struct zynq_i2c_registers *)ZYNQ_I2C_BASEADDR1 :
+		/* Zynq PS I2C0 */
+		(struct zynq_i2c_registers *)ZYNQ_I2C_BASEADDR0;
+}
 
 /* I2C init called by cmd_i2c when doing 'i2c reset'. */
 static void zynq_i2c_init(struct i2c_adapter *adap, int requested_speed,
 			  int slaveadd)
 {
+	struct zynq_i2c_registers *zynq_i2c = i2c_select(adap);
+
 	/* 111MHz / ( (3 * 17) * 22 ) = ~100KHz */
 	writel((16 << ZYNQ_I2C_CONTROL_DIV_B_SHIFT) |
 		(2 << ZYNQ_I2C_CONTROL_DIV_A_SHIFT), &zynq_i2c->control);
@@ -87,7 +89,7 @@ static void zynq_i2c_init(struct i2c_adapter *adap, int requested_speed,
 }
 
 #ifdef DEBUG
-static void zynq_i2c_debug_status(void)
+static void zynq_i2c_debug_status(struct zynq_i2c_registers *zynq_i2c)
 {
 	int int_status;
 	int status;
@@ -129,7 +131,7 @@ static void zynq_i2c_debug_status(void)
 #endif
 
 /* Wait for an interrupt */
-static u32 zynq_i2c_wait(u32 mask)
+static u32 zynq_i2c_wait(struct zynq_i2c_registers *zynq_i2c, u32 mask)
 {
 	int timeout, int_status;
 
@@ -140,7 +142,7 @@ static u32 zynq_i2c_wait(u32 mask)
 			break;
 	}
 #ifdef DEBUG
-	zynq_i2c_debug_status();
+	zynq_i2c_debug_status(zynq_i2c));
 #endif
 	/* Clear interrupt status flags */
 	writel(int_status & mask, &zynq_i2c->interrupt_status);
@@ -154,6 +156,8 @@ static u32 zynq_i2c_wait(u32 mask)
  */
 static int zynq_i2c_probe(struct i2c_adapter *adap, u8 dev)
 {
+	struct zynq_i2c_registers *zynq_i2c = i2c_select(adap);
+
 	/* Attempt to read a byte */
 	setbits_le32(&zynq_i2c->control, ZYNQ_I2C_CONTROL_CLR_FIFO |
 		ZYNQ_I2C_CONTROL_RW);
@@ -162,7 +166,7 @@ static int zynq_i2c_probe(struct i2c_adapter *adap, u8 dev)
 	writel(dev, &zynq_i2c->address);
 	writel(1, &zynq_i2c->transfer_size);
 
-	return (zynq_i2c_wait(ZYNQ_I2C_INTERRUPT_COMP |
+	return (zynq_i2c_wait(zynq_i2c, ZYNQ_I2C_INTERRUPT_COMP |
 		ZYNQ_I2C_INTERRUPT_NACK) &
 		ZYNQ_I2C_INTERRUPT_COMP) ? 0 : -ETIMEDOUT;
 }
@@ -177,6 +181,7 @@ static int zynq_i2c_read(struct i2c_adapter *adap, u8 dev, uint addr,
 	u32 status;
 	u32 i = 0;
 	u8 *cur_data = data;
+	struct zynq_i2c_registers *zynq_i2c = i2c_select(adap);
 
 	/* Check the hardware can handle the requested bytes */
 	if ((length < 0) || (length > ZYNQ_I2C_TRANSFERT_SIZE_MAX))
@@ -198,7 +203,7 @@ static int zynq_i2c_read(struct i2c_adapter *adap, u8 dev, uint addr,
 			writel(addr >> (8 * alen), &zynq_i2c->data);
 
 		/* Wait for the address to be sent */
-		if (!zynq_i2c_wait(ZYNQ_I2C_INTERRUPT_COMP)) {
+		if (!zynq_i2c_wait(zynq_i2c, ZYNQ_I2C_INTERRUPT_COMP)) {
 			/* Release the bus */
 			clrbits_le32(&zynq_i2c->control, ZYNQ_I2C_CONTROL_HOLD);
 			return -ETIMEDOUT;
@@ -214,7 +219,7 @@ static int zynq_i2c_read(struct i2c_adapter *adap, u8 dev, uint addr,
 
 	/* Wait for data */
 	do {
-		status = zynq_i2c_wait(ZYNQ_I2C_INTERRUPT_COMP |
+		status = zynq_i2c_wait(zynq_i2c, ZYNQ_I2C_INTERRUPT_COMP |
 			ZYNQ_I2C_INTERRUPT_DATA);
 		if (!status) {
 			/* Release the bus */
@@ -243,6 +248,7 @@ static int zynq_i2c_write(struct i2c_adapter *adap, u8 dev, uint addr,
 			  int alen, u8 *data, int length)
 {
 	u8 *cur_data = data;
+	struct zynq_i2c_registers *zynq_i2c = i2c_select(adap);
 
 	/* Write the register address */
 	setbits_le32(&zynq_i2c->control, ZYNQ_I2C_CONTROL_CLR_FIFO |
@@ -254,7 +260,7 @@ static int zynq_i2c_write(struct i2c_adapter *adap, u8 dev, uint addr,
 		while (alen--)
 			writel(addr >> (8 * alen), &zynq_i2c->data);
 		/* Start the tranfer */
-		if (!zynq_i2c_wait(ZYNQ_I2C_INTERRUPT_COMP)) {
+		if (!zynq_i2c_wait(zynq_i2c, ZYNQ_I2C_INTERRUPT_COMP)) {
 			/* Release the bus */
 			clrbits_le32(&zynq_i2c->control, ZYNQ_I2C_CONTROL_HOLD);
 			return -ETIMEDOUT;
@@ -265,7 +271,7 @@ static int zynq_i2c_write(struct i2c_adapter *adap, u8 dev, uint addr,
 	while (length--) {
 		writel(*(cur_data++), &zynq_i2c->data);
 		if (readl(&zynq_i2c->transfer_size) == ZYNQ_I2C_FIFO_DEPTH) {
-			if (!zynq_i2c_wait(ZYNQ_I2C_INTERRUPT_COMP)) {
+			if (!zynq_i2c_wait(zynq_i2c, ZYNQ_I2C_INTERRUPT_COMP)) {
 				/* Release the bus */
 				clrbits_le32(&zynq_i2c->control,
 					     ZYNQ_I2C_CONTROL_HOLD);
@@ -277,7 +283,7 @@ static int zynq_i2c_write(struct i2c_adapter *adap, u8 dev, uint addr,
 	/* All done... release the bus */
 	clrbits_le32(&zynq_i2c->control, ZYNQ_I2C_CONTROL_HOLD);
 	/* Wait for the address and data to be sent */
-	if (!zynq_i2c_wait(ZYNQ_I2C_INTERRUPT_COMP))
+	if (!zynq_i2c_wait(zynq_i2c, ZYNQ_I2C_INTERRUPT_COMP))
 		return -ETIMEDOUT;
 	return 0;
 }
@@ -295,3 +301,7 @@ U_BOOT_I2C_ADAP_COMPLETE(zynq_0, zynq_i2c_init, zynq_i2c_probe, zynq_i2c_read,
 			 zynq_i2c_write, zynq_i2c_set_bus_speed,
 			 CONFIG_SYS_I2C_ZYNQ_SPEED, CONFIG_SYS_I2C_ZYNQ_SLAVE,
 			 0)
+U_BOOT_I2C_ADAP_COMPLETE(zynq_1, zynq_i2c_init, zynq_i2c_probe, zynq_i2c_read,
+			 zynq_i2c_write, zynq_i2c_set_bus_speed,
+			 CONFIG_SYS_I2C_ZYNQ_SPEED, CONFIG_SYS_I2C_ZYNQ_SLAVE,
+			 1)

include/configs/zynq-common.h

@@ -104,13 +104,13 @@
 # define CONFIG_DOS_PARTITION
 #endif
 
+#define CONFIG_SYS_I2C_ZYNQ
 /* I2C */
-#if defined(CONFIG_ZYNQ_I2C0) || defined(CONFIG_ZYNQ_I2C1)
+#if defined(CONFIG_SYS_I2C_ZYNQ)
 # define CONFIG_CMD_I2C
 # define CONFIG_SYS_I2C
-# define CONFIG_SYS_I2C_ZYNQ
 # define CONFIG_SYS_I2C_ZYNQ_SPEED		100000
-# define CONFIG_SYS_I2C_ZYNQ_SLAVE		1
+# define CONFIG_SYS_I2C_ZYNQ_SLAVE		0
 #endif
 
 /* EEPROM */