Commit 8cc7331f authored by Jingchang Lu's avatar Jingchang Lu Committed by Wolfram Sang

i2c: imx: change register offset representation

the I2C register offset may different between SoCs,
to provid support for all these chips, split the
register offset into a fixed base address and a
variable shift value, then the full register offset
will be calculated by
reg_off = ( reg_base_addr << reg_shift)
Signed-off-by: default avatarJingchang Lu <b35083@freescale.com>
Reviewed-by: default avatarSascha Hauer <s.hauer@pengutronix.de>
Signed-off-by: default avatarWolfram Sang <wsa@the-dreams.de>
parent 1d5ef2a8
...@@ -64,12 +64,21 @@ ...@@ -64,12 +64,21 @@
/* Default value */ /* Default value */
#define IMX_I2C_BIT_RATE 100000 /* 100kHz */ #define IMX_I2C_BIT_RATE 100000 /* 100kHz */
/* IMX I2C registers */ /* IMX I2C registers:
* the I2C register offset is different between SoCs,
* to provid support for all these chips, split the
* register offset into a fixed base address and a
* variable shift value, then the full register offset
* will be calculated by
* reg_off = ( reg_base_addr << reg_shift)
*/
#define IMX_I2C_IADR 0x00 /* i2c slave address */ #define IMX_I2C_IADR 0x00 /* i2c slave address */
#define IMX_I2C_IFDR 0x04 /* i2c frequency divider */ #define IMX_I2C_IFDR 0x01 /* i2c frequency divider */
#define IMX_I2C_I2CR 0x08 /* i2c control */ #define IMX_I2C_I2CR 0x02 /* i2c control */
#define IMX_I2C_I2SR 0x0C /* i2c status */ #define IMX_I2C_I2SR 0x03 /* i2c status */
#define IMX_I2C_I2DR 0x10 /* i2c transfer data */ #define IMX_I2C_I2DR 0x04 /* i2c transfer data */
#define IMX_I2C_REGSHIFT 2
/* Bits of IMX I2C registers */ /* Bits of IMX I2C registers */
#define I2SR_RXAK 0x01 #define I2SR_RXAK 0x01
...@@ -163,13 +172,13 @@ static inline int is_imx1_i2c(struct imx_i2c_struct *i2c_imx) ...@@ -163,13 +172,13 @@ static inline int is_imx1_i2c(struct imx_i2c_struct *i2c_imx)
static inline void imx_i2c_write_reg(unsigned int val, static inline void imx_i2c_write_reg(unsigned int val,
struct imx_i2c_struct *i2c_imx, unsigned int reg) struct imx_i2c_struct *i2c_imx, unsigned int reg)
{ {
writeb(val, i2c_imx->base + reg); writeb(val, i2c_imx->base + (reg << IMX_I2C_REGSHIFT));
} }
static inline unsigned char imx_i2c_read_reg(struct imx_i2c_struct *i2c_imx, static inline unsigned char imx_i2c_read_reg(struct imx_i2c_struct *i2c_imx,
unsigned int reg) unsigned int reg)
{ {
return readb(i2c_imx->base + reg); return readb(i2c_imx->base + (reg << IMX_I2C_REGSHIFT));
} }
/** Functions for IMX I2C adapter driver *************************************** /** Functions for IMX I2C adapter driver ***************************************
......
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