ASPEED_I2C_INTR_STS_REG
writel(0xffffffff, bus->base + ASPEED_I2C_INTR_STS_REG);
irq_received = readl(bus->base + ASPEED_I2C_INTR_STS_REG);
bus->base + ASPEED_I2C_INTR_STS_REG);
readl(bus->base + ASPEED_I2C_INTR_STS_REG);
bus->base + ASPEED_I2C_INTR_STS_REG);
readl(bus->base + ASPEED_I2C_INTR_STS_REG);
writel(0xffffffff, bus->base + ASPEED_I2C_INTR_STS_REG);