i2c: mvtwsi: Factor out adap parameter

To be able to use the compatibility layer from the DM functions, we
factor the adap parameter out of all functions, and pass the actual
register base instead.

Signed-off-by: Mario Six <mario.six@gdsys.cc>
Reviewed-by: Stefan Roese <sr@denx.de>

drivers/i2c/mvtwsi.c

@@ -208,9 +208,8 @@ inline uint mvtwsi_error(uint ec, uint lc, uint ls, uint es)
  * Wait for IFLG to raise, or return 'timeout.' Then, if the status is as
  * expected, return 0 (ok) or 'wrong status' otherwise.
  */
-static int twsi_wait(struct i2c_adapter *adap, int expected_status)
+static int twsi_wait(struct mvtwsi_registers *twsi, int expected_status)
 {
-	struct mvtwsi_registers *twsi = twsi_get_base(adap);
 	int control, status;
 	int timeout = 1000;
 
@@ -236,39 +235,35 @@ static int twsi_wait(struct i2c_adapter *adap, int expected_status)
  * Assert the START condition, either in a single I2C transaction
  * or inside back-to-back ones (repeated starts).
  */
-static int twsi_start(struct i2c_adapter *adap, int expected_status)
+static int twsi_start(struct mvtwsi_registers *twsi, int expected_status)
 {
-	struct mvtwsi_registers *twsi = twsi_get_base(adap);
-
 	/* Assert START */
 	writel(MVTWSI_CONTROL_TWSIEN | MVTWSI_CONTROL_START |
 	       MVTWSI_CONTROL_CLEAR_IFLG, &twsi->control);
 	/* Wait for controller to process START */
-	return twsi_wait(adap, expected_status);
+	return twsi_wait(twsi, expected_status);
 }
 
 /*
  * Send a byte (i2c address or data).
  */
-static int twsi_send(struct i2c_adapter *adap, u8 byte, int expected_status)
+static int twsi_send(struct mvtwsi_registers *twsi, u8 byte,
+		     int expected_status)
 {
-	struct mvtwsi_registers *twsi = twsi_get_base(adap);
-
 	/* Write byte to data register for sending */
 	writel(byte, &twsi->data);
 	/* Clear any pending interrupt -- that will cause sending */
 	writel(MVTWSI_CONTROL_TWSIEN | MVTWSI_CONTROL_CLEAR_IFLG,
 	       &twsi->control);
 	/* Wait for controller to receive byte, and check ACK */
-	return twsi_wait(adap, expected_status);
+	return twsi_wait(twsi, expected_status);
 }
 
 /*
  * Receive a byte.
  */
-static int twsi_recv(struct i2c_adapter *adap, u8 *byte, int ack_flag)
+static int twsi_recv(struct mvtwsi_registers *twsi, u8 *byte, int ack_flag)
 {
-	struct mvtwsi_registers *twsi = twsi_get_base(adap);
 	int expected_status, status, control;
 
 	/* Compute expected status based on passed ACK flag */
@@ -279,7 +274,7 @@ static int twsi_recv(struct i2c_adapter *adap, u8 *byte, int ack_flag)
 	control |= ack_flag == MVTWSI_READ_ACK ? MVTWSI_CONTROL_ACK : 0;
 	writel(control | MVTWSI_CONTROL_CLEAR_IFLG, &twsi->control);
 	/* Wait for controller to receive byte, and assert ACK or NAK */
-	status = twsi_wait(adap, expected_status);
+	status = twsi_wait(twsi, expected_status);
 	/* If we did receive the expected byte, store it */
 	if (status == 0)
 		*byte = readl(&twsi->data);
@@ -290,9 +285,8 @@ static int twsi_recv(struct i2c_adapter *adap, u8 *byte, int ack_flag)
  * Assert the STOP condition.
  * This is also used to force the bus back to idle (SDA = SCL = 1).
  */
-static int twsi_stop(struct i2c_adapter *adap)
+static int twsi_stop(struct mvtwsi_registers *twsi)
 {
-	struct mvtwsi_registers *twsi = twsi_get_base(adap);
 	int control, stop_status;
 	int status = 0;
 	int timeout = 1000;
@@ -328,10 +322,8 @@ static uint twsi_calc_freq(const int n, const int m)
  * Controller reset also resets the baud rate and slave address, so
  * they must be re-established afterwards.
  */
-static void twsi_reset(struct i2c_adapter *adap)
+static void twsi_reset(struct mvtwsi_registers *twsi)
 {
-	struct mvtwsi_registers *twsi = twsi_get_base(adap);
-
 	/* Reset controller */
 	writel(0, &twsi->soft_reset);
 	/* Wait 2 ms -- this is what the Marvell LSP does */
@@ -341,10 +333,9 @@ static void twsi_reset(struct i2c_adapter *adap)
 /*
  * Sets baud to the highest possible value not exceeding the requested one.
  */
-static uint __twsi_i2c_set_bus_speed(struct i2c_adapter *adap,
+static uint __twsi_i2c_set_bus_speed(struct mvtwsi_registers *twsi,
 				     uint requested_speed)
 {
-	struct mvtwsi_registers *twsi = twsi_get_base(adap);
 	uint tmp_speed, highest_speed, n, m;
 	uint baud = 0x44; /* Baud rate after controller reset */
 
@@ -366,26 +357,25 @@ static uint __twsi_i2c_set_bus_speed(struct i2c_adapter *adap,
 	return 0;
 }
 
-static void __twsi_i2c_init(struct i2c_adapter *adap, int speed, int slaveadd)
+static void __twsi_i2c_init(struct mvtwsi_registers *twsi, int speed,
+			  int slaveadd)
 {
-	struct mvtwsi_registers *twsi = twsi_get_base(adap);
-
 	/* Reset controller */
-	twsi_reset(adap);
+	twsi_reset(twsi);
 	/* Set speed */
-	__twsi_i2c_set_bus_speed(adap, speed);
+	__twsi_i2c_set_bus_speed(twsi, speed);
 	/* Set slave address; even though we don't use it */
 	writel(slaveadd, &twsi->slave_address);
 	writel(0, &twsi->xtnd_slave_addr);
 	/* Assert STOP, but don't care for the result */
-	(void) twsi_stop(adap);
+	(void) twsi_stop(twsi);
 }
 
 /*
  * Begin I2C transaction with expected start status, at given address.
  * Expected address status will derive from direction bit (bit 0) in addr.
  */
-static int i2c_begin(struct i2c_adapter *adap, int expected_start_status,
+static int i2c_begin(struct mvtwsi_registers *twsi, int expected_start_status,
 		     u8 addr)
 {
 	int status, expected_addr_status;
@@ -397,10 +387,10 @@ static int i2c_begin(struct i2c_adapter *adap, int expected_start_status,
 	else /* Writing */
 		expected_addr_status = MVTWSI_STATUS_ADDR_W_ACK;
 	/* Assert START */
-	status = twsi_start(adap, expected_start_status);
+	status = twsi_start(twsi, expected_start_status);
 	/* Send out the address if the start went well */
 	if (status == 0)
-		status = twsi_send(adap, addr, expected_addr_status);
+		status = twsi_send(twsi, addr, expected_addr_status);
 	/* Return 0, or the status of the first failure */
 	return status;
 }
@@ -408,18 +398,18 @@ static int i2c_begin(struct i2c_adapter *adap, int expected_start_status,
 /*
  * Begin read, nak data byte, end.
  */
-static int __twsi_i2c_probe_chip(struct i2c_adapter *adap, uchar chip)
+static int __twsi_i2c_probe_chip(struct mvtwsi_registers *twsi, uchar chip)
 {
 	u8 dummy_byte;
 	int status;
 
 	/* Begin i2c read */
-	status = i2c_begin(adap, MVTWSI_STATUS_START, (chip << 1) | 1);
+	status = i2c_begin(twsi, MVTWSI_STATUS_START, (chip << 1) | 1);
 	/* Dummy read was accepted: receive byte, but NAK it. */
 	if (status == 0)
-		status = twsi_recv(adap, &dummy_byte, MVTWSI_READ_NAK);
+		status = twsi_recv(twsi, &dummy_byte, MVTWSI_READ_NAK);
 	/* Stop transaction */
-	twsi_stop(adap);
+	twsi_stop(twsi);
 	/* Return 0, or the status of the first failure */
 	return status;
 }
@@ -432,30 +422,30 @@ static int __twsi_i2c_probe_chip(struct i2c_adapter *adap, uchar chip)
  * higher level APIs, we need to make a decision here, and for the moment that
  * will be a repeated start without a preceding stop.
  */
-static int __twsi_i2c_read(struct i2c_adapter *adap, uchar chip, uint addr,
-			   int alen, uchar *data, int length)
+static int __twsi_i2c_read(struct mvtwsi_registers *twsi, uchar chip,
+			   uint addr, int alen, uchar *data, int length)
 {
 	int status = 0;
 	int stop_status;
 
 	/* Begin i2c write to send the address bytes */
-	status = i2c_begin(adap, MVTWSI_STATUS_START, (chip << 1));
+	status = i2c_begin(twsi, MVTWSI_STATUS_START, (chip << 1));
 	/* Send address bytes */
 	while ((status == 0) && alen--)
-		status = twsi_send(adap, addr >> (8*alen),
+		status = twsi_send(twsi, addr >> (8*alen),
 			MVTWSI_STATUS_DATA_W_ACK);
 	/* Begin i2c read to receive data bytes */
 	if (status == 0)
-		status = i2c_begin(adap, MVTWSI_STATUS_REPEATED_START,
+		status = i2c_begin(twsi, MVTWSI_STATUS_REPEATED_START,
 				   (chip << 1) | 1);
 	/* Receive actual data bytes; set NAK if we if we have nothing more to
 	 * read */
 	while ((status == 0) && length--)
-		status = twsi_recv(adap, data++,
+		status = twsi_recv(twsi, data++,
 				   length > 0 ?
 				   MVTWSI_READ_ACK : MVTWSI_READ_NAK);
 	/* Stop transaction */
-	stop_status = twsi_stop(adap);
+	stop_status = twsi_stop(twsi);
 	/* Return 0, or the status of the first failure */
 	return status != 0 ? status : stop_status;
 }
@@ -463,23 +453,23 @@ static int __twsi_i2c_read(struct i2c_adapter *adap, uchar chip, uint addr,
 /*
  * Begin write, send address byte(s), send data bytes, end.
  */
-static int __twsi_i2c_write(struct i2c_adapter *adap, uchar chip, uint addr,
-			    int alen, uchar *data, int length)
+static int __twsi_i2c_write(struct mvtwsi_registers *twsi, uchar chip,
+			    uint addr, int alen, uchar *data, int length)
 {
 	int status, stop_status;
 
 	/* Begin i2c write to send first the address bytes, then the
 	 * data bytes */
-	status = i2c_begin(adap, MVTWSI_STATUS_START, (chip << 1));
+	status = i2c_begin(twsi, MVTWSI_STATUS_START, (chip << 1));
 	/* Send address bytes */
 	while ((status == 0) && alen--)
-		status = twsi_send(adap, addr >> (8*alen),
+		status = twsi_send(twsi, addr >> (8*alen),
 			MVTWSI_STATUS_DATA_W_ACK);
 	/* Send data bytes */
 	while ((status == 0) && (length-- > 0))
-		status = twsi_send(adap, *(data++), MVTWSI_STATUS_DATA_W_ACK);
+		status = twsi_send(twsi, *(data++), MVTWSI_STATUS_DATA_W_ACK);
 	/* Stop transaction */
-	stop_status = twsi_stop(adap);
+	stop_status = twsi_stop(twsi);
 	/* Return 0, or the status of the first failure */
 	return status != 0 ? status : stop_status;
 }
@@ -487,30 +477,35 @@ static int __twsi_i2c_write(struct i2c_adapter *adap, uchar chip, uint addr,
 static void twsi_i2c_init(struct i2c_adapter *adap, int speed,
 			  int slaveadd)
 {
-	__twsi_i2c_init(adap, speed, slaveadd);
+	struct mvtwsi_registers *twsi = twsi_get_base(adap);
+	__twsi_i2c_init(twsi, speed, slaveadd);
 }
 
 static uint twsi_i2c_set_bus_speed(struct i2c_adapter *adap,
 				   uint requested_speed)
 {
-	return __twsi_i2c_set_bus_speed(adap, requested_speed);
+	struct mvtwsi_registers *twsi = twsi_get_base(adap);
+	return __twsi_i2c_set_bus_speed(twsi, requested_speed);
 }
 
 static int twsi_i2c_probe(struct i2c_adapter *adap, uchar chip)
 {
-	return __twsi_i2c_probe_chip(adap, chip);
+	struct mvtwsi_registers *twsi = twsi_get_base(adap);
+	return __twsi_i2c_probe_chip(twsi, chip);
 }
 
 static int twsi_i2c_read(struct i2c_adapter *adap, uchar chip, uint addr,
 			 int alen, uchar *data, int length)
 {
-	return __twsi_i2c_read(adap, chip, addr, alen, data, length);
+	struct mvtwsi_registers *twsi = twsi_get_base(adap);
+	return __twsi_i2c_read(twsi, chip, addr, alen, data, length);
 }
 
 static int twsi_i2c_write(struct i2c_adapter *adap, uchar chip, uint addr,
 			  int alen, uchar *data, int length)
 {
-	return __twsi_i2c_write(adap, chip, addr, alen, data, length);
+	struct mvtwsi_registers *twsi = twsi_get_base(adap);
+	return __twsi_i2c_write(twsi, chip, addr, alen, data, length);
 }
 
 #ifdef CONFIG_I2C_MVTWSI_BASE0