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Commit 82a44134 authored by Linus Walleij's avatar Linus Walleij Committed by Ben Dooks
Browse files

i2c-nomadik: break out single messsage transmission 



Reduce code size in the message transfer function by factoring out
a single-message transfer function.

Signed-off-by: default avatarLinus Walleij <linus.walleij@linaro.org>
Signed-off-by: default avatarBen Dooks <ben-linux@fluff.org>
parent 0511f643

drivers/i2c/busses/i2c-nomadik.c

+48 −32
Original line number Diff line number Diff line
@@ -524,6 +524,51 @@ static int write_i2c(struct nmk_i2c_dev *dev) 
	return status;

}



/**

 * nmk_i2c_xfer_one() - transmit a single I2C message

 * @dev: device with a message encoded into it

 * @flags: message flags

 */

static int nmk_i2c_xfer_one(struct nmk_i2c_dev *dev, u16 flags)

{

	int status;



	if (flags & I2C_M_RD) {

		/* read operation */

		dev->cli.operation = I2C_READ;

		status = read_i2c(dev);

	} else {

		/* write operation */

		dev->cli.operation = I2C_WRITE;

		status = write_i2c(dev);

	}



	if (status || (dev->result)) {

		u32 i2c_sr;

		u32 cause;



		i2c_sr = readl(dev->virtbase + I2C_SR);

		/*

		 * Check if the controller I2C operation status

		 * is set to ABORT(11b).

		 */

		if (((i2c_sr >> 2) & 0x3) == 0x3) {

			/* get the abort cause */

			cause =	(i2c_sr >> 4) & 0x7;

			dev_err(&dev->pdev->dev, "%s\n", cause

				>= ARRAY_SIZE(abort_causes) ?

				"unknown reason" :

				abort_causes[cause]);

		}



		(void) init_hw(dev);



		status = status ? status : dev->result;

	}



	return status;

}



/**

 * nmk_i2c_xfer() - I2C transfer function used by kernel framework

 * @i2c_adap: Adapter pointer to the controller
@@ -576,9 +621,7 @@ static int nmk_i2c_xfer(struct i2c_adapter *i2c_adap, 
{

	int status;

	int i;

	u32 cause;

	struct nmk_i2c_dev *dev = i2c_get_adapdata(i2c_adap);

	u32 i2c_sr;

	int j;



	dev->busy = true;
@@ -593,6 +636,7 @@ static int nmk_i2c_xfer(struct i2c_adapter *i2c_adap, 
	if (status)

		goto out;



	/* Attempt three times to send the message queue */

	for (j = 0; j < 3; j++) {

		/* setup the i2c controller */

		setup_i2c_controller(dev);
@@ -611,38 +655,10 @@ static int nmk_i2c_xfer(struct i2c_adapter *i2c_adap, 
			dev->stop = (i < (num_msgs - 1)) ? 0 : 1;

			dev->result = 0;



			if (msgs[i].flags & I2C_M_RD) {

				/* it is a read operation */

				dev->cli.operation = I2C_READ;

				status = read_i2c(dev);

			} else {

				/* write operation */

				dev->cli.operation = I2C_WRITE;

				status = write_i2c(dev);

			}

			if (status || (dev->result)) {

				i2c_sr = readl(dev->virtbase + I2C_SR);

				/*

				 * Check if the controller I2C operation status

				 * is set to ABORT(11b).

				 */

				if (((i2c_sr >> 2) & 0x3) == 0x3) {

					/* get the abort cause */

					cause =	(i2c_sr >> 4)

						& 0x7;

					dev_err(&dev->pdev->dev, "%s\n", cause

						>= ARRAY_SIZE(abort_causes) ?

						"unknown reason" :

						abort_causes[cause]);

				}



				(void) init_hw(dev);



				status = status ? status : dev->result;



			status = nmk_i2c_xfer_one(dev, msgs[i].flags);

			if (status != 0)

				break;

		}

		}

		if (status == 0)

			break;

	}