diff options
Diffstat (limited to 'drivers/omap24xx_i2c.c')
| -rw-r--r-- | drivers/omap24xx_i2c.c | 17 |
1 files changed, 14 insertions, 3 deletions
diff --git a/drivers/omap24xx_i2c.c b/drivers/omap24xx_i2c.c index 383dfcbb6..7dab78685 100644 --- a/drivers/omap24xx_i2c.c +++ b/drivers/omap24xx_i2c.c @@ -32,12 +32,16 @@ static void wait_for_bb (void); static u16 wait_for_pin (void); -void flush_fifo(void); +static void flush_fifo(void); void i2c_init (int speed, int slaveadd) { u16 scl; + outw(0x2, I2C_SYSC); /* for ES2 after soft reset */ + udelay(1000); + outw(0x0, I2C_SYSC); /* will probably self clear but */ + if (inw (I2C_CON) & I2C_CON_EN) { outw (0, I2C_CON); udelay (50000); @@ -52,11 +56,14 @@ void i2c_init (int speed, int slaveadd) /* own address */ outw (slaveadd, I2C_OA); outw (I2C_CON_EN, I2C_CON); - outw (0, I2C_CNT); + /* have to enable intrrupts or OMAP i2c module doesn't work */ outw (I2C_IE_XRDY_IE | I2C_IE_RRDY_IE | I2C_IE_ARDY_IE | I2C_IE_NACK_IE | I2C_IE_AL_IE, I2C_IE); udelay (1000); + flush_fifo(); + outw (0xFFFF, I2C_STAT); + outw (0, I2C_CNT); } static int i2c_read_byte (u8 devaddr, u8 regoffset, u8 * value) @@ -160,11 +167,15 @@ static int i2c_write_byte (u8 devaddr, u8 regoffset, u8 value) } if (!i2c_error) { + int eout = 200; + outw (I2C_CON_EN, I2C_CON); while ((stat = inw (I2C_STAT)) || (inw (I2C_CON) & I2C_CON_MST)) { udelay (1000); /* have to read to clear intrrupt */ outw (0xFFFF, I2C_STAT); + if(--eout == 0) /* better leave with error than hang */ + break; } } flush_fifo(); @@ -173,7 +184,7 @@ static int i2c_write_byte (u8 devaddr, u8 regoffset, u8 value) return i2c_error; } -void flush_fifo(void) +static void flush_fifo(void) { u16 stat; /* note: if you try and read data when its not there or ready |