diff options
Diffstat (limited to 'drivers')
| -rw-r--r-- | drivers/i2c/designware_i2c.c | 44 |
1 files changed, 39 insertions, 5 deletions
diff --git a/drivers/i2c/designware_i2c.c b/drivers/i2c/designware_i2c.c index 8ad716f410e..8d290acefda 100644 --- a/drivers/i2c/designware_i2c.c +++ b/drivers/i2c/designware_i2c.c @@ -740,13 +740,47 @@ static int designware_i2c_probe_chip(struct udevice *bus, uint chip_addr, { struct dw_i2c *i2c = dev_get_priv(bus); struct i2c_regs *i2c_base = i2c->regs; - u32 tmp; - int ret; + u32 start_time, ic_status; + int ret = 0; - /* Try to read the first location of the chip */ - ret = __dw_i2c_read(i2c_base, chip_addr, 0, 1, (uchar *)&tmp, 1); + ret = i2c_wait_for_bb(i2c_base); if (ret) - __dw_i2c_init(i2c_base, 0, 0); + return ret; + + dw_i2c_enable(i2c_base, false); + writel(chip_addr, &i2c_base->ic_tar); + dw_i2c_enable(i2c_base, true); + + writel(IC_STOP, &i2c_base->ic_cmd_data); + + start_time = get_timer(0); + while (1) { + ic_status = readl(&i2c_base->ic_status); + + if ((ic_status & IC_STATUS_TFE) && !(ic_status & IC_STATUS_MA)) + break; + + if (readl(&i2c_base->ic_raw_intr_stat) & IC_TX_ABRT) { + readl(&i2c_base->ic_clr_tx_abrt); + ret = -EREMOTEIO; + break; + } + + if (get_timer(start_time) > I2C_BYTE_TO) { + ret = -ETIMEDOUT; + break; + } + } + + start_time = get_timer(0); + while (1) { + if ((readl(&i2c_base->ic_raw_intr_stat) & IC_STOP_DET)) { + readl(&i2c_base->ic_clr_stop_det); + break; + } else if (get_timer(start_time) > I2C_STOPDET_TO) { + break; + } + } return ret; } |