diff options
Diffstat (limited to 'drivers/i2c/busses/i2c-omap.c')
| -rw-r--r-- | drivers/i2c/busses/i2c-omap.c | 59 |
1 files changed, 38 insertions, 21 deletions
diff --git a/drivers/i2c/busses/i2c-omap.c b/drivers/i2c/busses/i2c-omap.c index 75bf3ad1809..c7c237537f8 100644 --- a/drivers/i2c/busses/i2c-omap.c +++ b/drivers/i2c/busses/i2c-omap.c @@ -49,24 +49,24 @@ #define OMAP_I2C_TIMEOUT (msecs_to_jiffies(1000)) #define OMAP_I2C_REV_REG 0x00 -#define OMAP_I2C_IE_REG 0x04 -#define OMAP_I2C_STAT_REG 0x08 -#define OMAP_I2C_IV_REG 0x0c +#define OMAP_I2C_IE_REG 0x01 +#define OMAP_I2C_STAT_REG 0x02 +#define OMAP_I2C_IV_REG 0x03 /* For OMAP3 I2C_IV has changed to I2C_WE (wakeup enable) */ -#define OMAP_I2C_WE_REG 0x0c -#define OMAP_I2C_SYSS_REG 0x10 -#define OMAP_I2C_BUF_REG 0x14 -#define OMAP_I2C_CNT_REG 0x18 -#define OMAP_I2C_DATA_REG 0x1c -#define OMAP_I2C_SYSC_REG 0x20 -#define OMAP_I2C_CON_REG 0x24 -#define OMAP_I2C_OA_REG 0x28 -#define OMAP_I2C_SA_REG 0x2c -#define OMAP_I2C_PSC_REG 0x30 -#define OMAP_I2C_SCLL_REG 0x34 -#define OMAP_I2C_SCLH_REG 0x38 -#define OMAP_I2C_SYSTEST_REG 0x3c -#define OMAP_I2C_BUFSTAT_REG 0x40 +#define OMAP_I2C_WE_REG 0x03 +#define OMAP_I2C_SYSS_REG 0x04 +#define OMAP_I2C_BUF_REG 0x05 +#define OMAP_I2C_CNT_REG 0x06 +#define OMAP_I2C_DATA_REG 0x07 +#define OMAP_I2C_SYSC_REG 0x08 +#define OMAP_I2C_CON_REG 0x09 +#define OMAP_I2C_OA_REG 0x0a +#define OMAP_I2C_SA_REG 0x0b +#define OMAP_I2C_PSC_REG 0x0c +#define OMAP_I2C_SCLL_REG 0x0d +#define OMAP_I2C_SCLH_REG 0x0e +#define OMAP_I2C_SYSTEST_REG 0x0f +#define OMAP_I2C_BUFSTAT_REG 0x10 /* I2C Interrupt Enable Register (OMAP_I2C_IE): */ #define OMAP_I2C_IE_XDR (1 << 14) /* TX Buffer drain int enable */ @@ -161,6 +161,7 @@ struct omap_i2c_dev { struct device *dev; void __iomem *base; /* virtual */ int irq; + int reg_shift; /* bit shift for I2C register addresses */ struct clk *iclk; /* Interface clock */ struct clk *fclk; /* Functional clock */ struct completion cmd_complete; @@ -189,12 +190,12 @@ struct omap_i2c_dev { static inline void omap_i2c_write_reg(struct omap_i2c_dev *i2c_dev, int reg, u16 val) { - __raw_writew(val, i2c_dev->base + reg); + __raw_writew(val, i2c_dev->base + (reg << i2c_dev->reg_shift)); } static inline u16 omap_i2c_read_reg(struct omap_i2c_dev *i2c_dev, int reg) { - return __raw_readw(i2c_dev->base + reg); + return __raw_readw(i2c_dev->base + (reg << i2c_dev->reg_shift)); } static int __init omap_i2c_get_clocks(struct omap_i2c_dev *dev) @@ -247,7 +248,13 @@ static void omap_i2c_unidle(struct omap_i2c_dev *dev) omap_i2c_write_reg(dev, OMAP_I2C_CON_REG, OMAP_I2C_CON_EN); } dev->idle = 0; - omap_i2c_write_reg(dev, OMAP_I2C_IE_REG, dev->iestate); + + /* + * Don't write to this register if the IE state is 0 as it can + * cause deadlock. + */ + if (dev->iestate) + omap_i2c_write_reg(dev, OMAP_I2C_IE_REG, dev->iestate); } static void omap_i2c_idle(struct omap_i2c_dev *dev) @@ -280,6 +287,11 @@ static int omap_i2c_init(struct omap_i2c_dev *dev) unsigned long internal_clk = 0; if (dev->rev >= OMAP_I2C_REV_2) { + /* Disable I2C controller before soft reset */ + omap_i2c_write_reg(dev, OMAP_I2C_CON_REG, + omap_i2c_read_reg(dev, OMAP_I2C_CON_REG) & + ~(OMAP_I2C_CON_EN)); + omap_i2c_write_reg(dev, OMAP_I2C_SYSC_REG, SYSC_SOFTRESET_MASK); /* For some reason we need to set the EN bit before the * reset done bit gets set. */ @@ -838,7 +850,7 @@ static const struct i2c_algorithm omap_i2c_algo = { .functionality = omap_i2c_func, }; -static int __init +static int __devinit omap_i2c_probe(struct platform_device *pdev) { struct omap_i2c_dev *dev; @@ -913,6 +925,11 @@ omap_i2c_probe(struct platform_device *pdev) dev->b_hw = 1; /* Enable hardware fixes */ } + if (cpu_is_omap7xx()) + dev->reg_shift = 1; + else + dev->reg_shift = 2; + /* reset ASAP, clearing any IRQs */ omap_i2c_init(dev); |