[U-Boot] [PATCH 09/13] i2c: mvtwsi: Make address length variable

[Mario Six]

The length of the address parameter of the __twsi_i2c_read and
__twsi_i2c_write functions is fixed to four bytes.

As a final step in the preparation of the DM conversion, we make the
length of this parameter variable by turning it into an array of bytes,
and convert the 32 byte value that's passed to the legacy functions into
a four-byte-array on the fly.

Signed-off-by: Mario Six <mario.six at gdsys.cc>
---
 drivers/i2c/mvtwsi.c | 30 +++++++++++++++++++++---------
 1 file changed, 21 insertions(+), 9 deletions(-)

diff --git a/drivers/i2c/mvtwsi.c b/drivers/i2c/mvtwsi.c
index 688efc2..3325c4b 100644
--- a/drivers/i2c/mvtwsi.c
+++ b/drivers/i2c/mvtwsi.c
@@ -423,7 +423,7 @@ static int __twsi_i2c_probe_chip(struct mvtwsi_registers *twsi, uchar chip)
  * will be a repeated start without a preceding stop.
  */
 static int __twsi_i2c_read(struct mvtwsi_registers *twsi, uchar chip,
-			   uint addr, int alen, uchar *data, int length)
+			   u8 *addr, int alen, uchar *data, int length)
 {
 	int status = 0;
 	int stop_status;
@@ -432,8 +432,7 @@ static int __twsi_i2c_read(struct mvtwsi_registers *twsi, uchar chip,
 	status = i2c_begin(twsi, MVTWSI_STATUS_START, (chip << 1));
 	/* Send address bytes */
 	while ((status == 0) && alen--)
-		status = twsi_send(twsi, addr >> (8*alen),
-			MVTWSI_STATUS_DATA_W_ACK);
+		status = twsi_send(twsi, *(addr++), MVTWSI_STATUS_DATA_W_ACK);
 	/* Begin i2c read to receive data bytes */
 	if (status == 0)
 		status = i2c_begin(twsi, MVTWSI_STATUS_REPEATED_START,
@@ -454,7 +453,7 @@ static int __twsi_i2c_read(struct mvtwsi_registers *twsi, uchar chip,
  * Begin write, send address byte(s), send data bytes, end.
  */
 static int __twsi_i2c_write(struct mvtwsi_registers *twsi, uchar chip,
-			    uint addr, int alen, uchar *data, int length)
+			    u8 *addr, int alen, uchar *data, int length)
 {
 	int status, stop_status;
 
@@ -462,9 +461,8 @@ static int __twsi_i2c_write(struct mvtwsi_registers *twsi, uchar chip,
 	 * data bytes */
 	status = i2c_begin(twsi, MVTWSI_STATUS_START, (chip << 1));
 	/* Send address bytes */
-	while ((status == 0) && alen--)
-		status = twsi_send(twsi, addr >> (8*alen),
-			MVTWSI_STATUS_DATA_W_ACK);
+	while ((status == 0) && (alen-- > 0))
+		status = twsi_send(twsi, *(addr++), MVTWSI_STATUS_DATA_W_ACK);
 	/* Send data bytes */
 	while ((status == 0) && (length-- > 0))
 		status = twsi_send(twsi, *(data++), MVTWSI_STATUS_DATA_W_ACK);
@@ -498,14 +496,28 @@ static int twsi_i2c_read(struct i2c_adapter *adap, uchar chip, uint addr,
 			 int alen, uchar *data, int length)
 {
 	struct mvtwsi_registers *twsi = twsi_get_base(adap);
-	return __twsi_i2c_read(twsi, chip, addr, alen, data, length);
+	u8 addr_bytes[4];
+
+	addr_bytes[0] = (addr >> 0) & 0xFF;
+	addr_bytes[1] = (addr >> 8) & 0xFF;
+	addr_bytes[2] = (addr >> 16) & 0xFF;
+	addr_bytes[3] = (addr >> 24) & 0xFF;
+
+	return __twsi_i2c_read(twsi, chip, addr_bytes, alen, data, length);
 }
 
 static int twsi_i2c_write(struct i2c_adapter *adap, uchar chip, uint addr,
 			  int alen, uchar *data, int length)
 {
 	struct mvtwsi_registers *twsi = twsi_get_base(adap);
-	return __twsi_i2c_write(twsi, chip, addr, alen, data, length);
+	u8 addr_bytes[4];
+
+	addr_bytes[0] = (addr >> 0) & 0xFF;
+	addr_bytes[1] = (addr >> 8) & 0xFF;
+	addr_bytes[2] = (addr >> 16) & 0xFF;
+	addr_bytes[3] = (addr >> 24) & 0xFF;
+
+	return __twsi_i2c_write(twsi, chip, addr_bytes, alen, data, length);
 }
 
 #ifdef CONFIG_I2C_MVTWSI_BASE0
-- 
2.9.0