Work based on i2c-omap.c from linux kernel.
fsscll/fssclh and hsscll/hssclh was always negative in high speed.
i2c high speed frequency start after 400Khz.
Signed-off-by: Christophe Ricard christophe-h.ricard@st.com ---
drivers/i2c/omap24xx_i2c.c | 17 +++++++++-------- 1 file changed, 9 insertions(+), 8 deletions(-)
diff --git a/drivers/i2c/omap24xx_i2c.c b/drivers/i2c/omap24xx_i2c.c index 48ca446..774edaf 100644 --- a/drivers/i2c/omap24xx_i2c.c +++ b/drivers/i2c/omap24xx_i2c.c @@ -129,7 +129,9 @@ static int omap24_i2c_setspeed(struct udevice *adap, unsigned int speed) i2c_base = i2c_bus->i2c_base; #endif
- if (speed >= OMAP_I2C_HIGH_SPEED) { + if (speed > 400000) { + unsigned long scl; + /* High speed */ psc = I2C_IP_CLK / I2C_INTERNAL_SAMPLING_CLK; psc -= 1; @@ -139,12 +141,11 @@ static int omap24_i2c_setspeed(struct udevice *adap, unsigned int speed) }
/* For first phase of HS mode */ - fsscll = I2C_INTERNAL_SAMPLING_CLK / (2 * speed); + scl = I2C_INTERNAL_SAMPLING_CLK / 400000;
- fssclh = fsscll; + fsscll = scl - (scl / 3) - 7; + fssclh = (scl / 3) - 5;
- fsscll -= I2C_HIGHSPEED_PHASE_ONE_SCLL_TRIM; - fssclh -= I2C_HIGHSPEED_PHASE_ONE_SCLH_TRIM; if (((fsscll < 0) || (fssclh < 0)) || ((fsscll > 255) || (fssclh > 255))) { puts("Error : I2C initializing first phase clock\n"); @@ -152,10 +153,10 @@ static int omap24_i2c_setspeed(struct udevice *adap, unsigned int speed) }
/* For second phase of HS mode */ - hsscll = hssclh = I2C_INTERNAL_SAMPLING_CLK / (2 * speed); + scl = I2C_IP_CLK / speed; + hsscll = scl - (scl / 3) - 7; + hssclh = (scl / 3) - 5;
- hsscll -= I2C_HIGHSPEED_PHASE_TWO_SCLL_TRIM; - hssclh -= I2C_HIGHSPEED_PHASE_TWO_SCLH_TRIM; if (((fsscll < 0) || (fssclh < 0)) || ((fsscll > 255) || (fssclh > 255))) { puts("Error : I2C initializing second phase clock\n");