diff options
Diffstat (limited to 'drivers/i2c')
| -rw-r--r-- | drivers/i2c/mxc_i2c.c | 53 |
1 files changed, 20 insertions, 33 deletions
diff --git a/drivers/i2c/mxc_i2c.c b/drivers/i2c/mxc_i2c.c index 83c2fab..9efa9bd 100644 --- a/drivers/i2c/mxc_i2c.c +++ b/drivers/i2c/mxc_i2c.c @@ -201,37 +201,6 @@ static int tx_byte(struct mxc_i2c_regs *i2c_regs, u8 byte) } /* - * Start the controller - */ -int i2c_imx_start(void) -{ - struct mxc_i2c_regs *i2c_regs = (struct mxc_i2c_regs *)I2C_BASE; - unsigned int temp = 0; - int result; - - /* Enable I2C controller */ - writeb(0, &i2c_regs->i2sr); - writeb(I2CR_IEN, &i2c_regs->i2cr); - - /* Wait controller to be stable */ - udelay(50); - - /* Start I2C transaction */ - temp = readb(&i2c_regs->i2cr); - temp |= I2CR_MSTA; - writeb(temp, &i2c_regs->i2cr); - - result = wait_for_sr_state(i2c_regs, ST_BUS_BUSY); - if (result < 0) - return result; - - temp |= I2CR_MTX | I2CR_TX_NO_AK; - writeb(temp, &i2c_regs->i2cr); - - return 0; -} - -/* * Stop the controller */ void i2c_imx_stop(void) @@ -259,10 +228,28 @@ void i2c_imx_stop(void) static int i2c_init_transfer(struct mxc_i2c_regs *i2c_regs, uchar chip, uint addr, int alen) { - int ret = i2c_imx_start(); - if (ret) + unsigned int temp; + int ret; + + /* Enable I2C controller */ + writeb(0, &i2c_regs->i2sr); + writeb(I2CR_IEN, &i2c_regs->i2cr); + + /* Wait for controller to be stable */ + udelay(50); + + /* Start I2C transaction */ + temp = readb(&i2c_regs->i2cr); + temp |= I2CR_MSTA; + writeb(temp, &i2c_regs->i2cr); + + ret = wait_for_sr_state(i2c_regs, ST_BUS_BUSY); + if (ret < 0) goto exit; + temp |= I2CR_MTX | I2CR_TX_NO_AK; + writeb(temp, &i2c_regs->i2cr); + /* write slave address */ ret = tx_byte(i2c_regs, chip << 1); if (ret < 0) |