diff options
Diffstat (limited to 'drivers/i2c/busses/i2c-imx.c')
| -rw-r--r-- | drivers/i2c/busses/i2c-imx.c | 27 |
1 files changed, 22 insertions, 5 deletions
diff --git a/drivers/i2c/busses/i2c-imx.c b/drivers/i2c/busses/i2c-imx.c index 8a292a95e86a..dc9f2ec22a29 100644 --- a/drivers/i2c/busses/i2c-imx.c +++ b/drivers/i2c/busses/i2c-imx.c @@ -95,6 +95,22 @@ #define I2CR_IIEN 0x40 #define I2CR_IEN 0x80 +/* register bits different operating codes definition: + * 1) I2SR: Interrupt flags clear operation differ between SoCs: + * - write zero to clear(w0c) INT flag on i.MX, + * - but write one to clear(w1c) INT flag on Vybrid. + * 2) I2CR: I2C module enable operation also differ between SoCs: + * - set I2CR_IEN bit enable the module on i.MX, + * - but clear I2CR_IEN bit enable the module on Vybrid. + */ +#define I2SR_CLR_OPCODE_W0C 0x0 +#define I2SR_CLR_OPCODE_W1C (I2SR_IAL | I2SR_IIF) +#define I2CR_IEN_OPCODE_0 0x0 +#define I2CR_IEN_OPCODE_1 I2CR_IEN + +#define IMX_I2SR_CLR_OPCODE I2SR_CLR_OPCODE_W0C +#define IMX_I2CR_IEN_OPCODE I2CR_IEN_OPCODE_1 + /** Variables ****************************************************************** *******************************************************************************/ @@ -242,8 +258,8 @@ static int i2c_imx_start(struct imx_i2c_struct *i2c_imx) clk_prepare_enable(i2c_imx->clk); imx_i2c_write_reg(i2c_imx->ifdr, i2c_imx, IMX_I2C_IFDR); /* Enable I2C controller */ - imx_i2c_write_reg(0, i2c_imx, IMX_I2C_I2SR); - imx_i2c_write_reg(I2CR_IEN, i2c_imx, IMX_I2C_I2CR); + imx_i2c_write_reg(IMX_I2SR_CLR_OPCODE, i2c_imx, IMX_I2C_I2SR); + imx_i2c_write_reg(IMX_I2CR_IEN_OPCODE, i2c_imx, IMX_I2C_I2CR); /* Wait controller to be stable */ udelay(50); @@ -287,7 +303,7 @@ static void i2c_imx_stop(struct imx_i2c_struct *i2c_imx) } /* Disable I2C controller */ - imx_i2c_write_reg(0, i2c_imx, IMX_I2C_I2CR); + imx_i2c_write_reg(IMX_I2CR_IEN_OPCODE ^ I2CR_IEN, i2c_imx, IMX_I2C_I2CR); clk_disable_unprepare(i2c_imx->clk); } @@ -339,6 +355,7 @@ static irqreturn_t i2c_imx_isr(int irq, void *dev_id) /* save status register */ i2c_imx->i2csr = temp; temp &= ~I2SR_IIF; + temp |= (IMX_I2SR_CLR_OPCODE & I2SR_IIF); imx_i2c_write_reg(temp, i2c_imx, IMX_I2C_I2SR); wake_up(&i2c_imx->queue); return IRQ_HANDLED; @@ -596,8 +613,8 @@ static int __init i2c_imx_probe(struct platform_device *pdev) i2c_imx_set_clk(i2c_imx, bitrate); /* Set up chip registers to defaults */ - imx_i2c_write_reg(0, i2c_imx, IMX_I2C_I2CR); - imx_i2c_write_reg(0, i2c_imx, IMX_I2C_I2SR); + imx_i2c_write_reg(IMX_I2CR_IEN_OPCODE ^ I2CR_IEN, i2c_imx, IMX_I2C_I2CR); + imx_i2c_write_reg(IMX_I2SR_CLR_OPCODE, i2c_imx, IMX_I2C_I2SR); /* Add I2C adapter */ ret = i2c_add_numbered_adapter(&i2c_imx->adapter); |