diff options
| author | Jingchang Lu <b35083@freescale.com> | 2013-08-07 17:05:40 +0800 |
|---|---|---|
| committer | Wolfram Sang <wsa@the-dreams.de> | 2013-08-15 16:13:17 +0200 |
| commit | 8cc7331ff372b9d03f8b2eb1422052bd99430611 (patch) | |
| tree | 66e705a8e5b33abd0d7d1d920a5018a9ecef926e /drivers/i2c | |
| parent | 1d5ef2a83e3097408924b5eea8d7750bbde21e45 (diff) | |
| download | linux-8cc7331ff372b9d03f8b2eb1422052bd99430611.tar.bz2 | |
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: Jingchang Lu <b35083@freescale.com>
Reviewed-by: Sascha Hauer <s.hauer@pengutronix.de>
Signed-off-by: Wolfram Sang <wsa@the-dreams.de>
Diffstat (limited to 'drivers/i2c')
| -rw-r--r-- | drivers/i2c/busses/i2c-imx.c | 23 |
1 files changed, 16 insertions, 7 deletions
diff --git a/drivers/i2c/busses/i2c-imx.c b/drivers/i2c/busses/i2c-imx.c index 1a3c60854f79..8a292a95e86a 100644 --- a/drivers/i2c/busses/i2c-imx.c +++ b/drivers/i2c/busses/i2c-imx.c @@ -64,12 +64,21 @@ /* Default value */ #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_IFDR 0x04 /* i2c frequency divider */ -#define IMX_I2C_I2CR 0x08 /* i2c control */ -#define IMX_I2C_I2SR 0x0C /* i2c status */ -#define IMX_I2C_I2DR 0x10 /* i2c transfer data */ +#define IMX_I2C_IFDR 0x01 /* i2c frequency divider */ +#define IMX_I2C_I2CR 0x02 /* i2c control */ +#define IMX_I2C_I2SR 0x03 /* i2c status */ +#define IMX_I2C_I2DR 0x04 /* i2c transfer data */ + +#define IMX_I2C_REGSHIFT 2 /* Bits of IMX I2C registers */ #define I2SR_RXAK 0x01 @@ -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, 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, unsigned int reg) { - return readb(i2c_imx->base + reg); + return readb(i2c_imx->base + (reg << IMX_I2C_REGSHIFT)); } /** Functions for IMX I2C adapter driver *************************************** |