diff options
| -rw-r--r-- | drivers/i2c/busses/i2c-designware.c | 30 |
1 files changed, 19 insertions, 11 deletions
diff --git a/drivers/i2c/busses/i2c-designware.c b/drivers/i2c/busses/i2c-designware.c index 934dfe1e6ce9..a7abbcd3d805 100644 --- a/drivers/i2c/busses/i2c-designware.c +++ b/drivers/i2c/busses/i2c-designware.c @@ -305,10 +305,24 @@ static u32 i2c_dw_scl_lcnt(u32 ic_clk, u32 tLOW, u32 tf, int offset) * This function is called during I2C init function, and in case of timeout at * run time. */ -static void i2c_dw_init(struct dw_i2c_dev *dev) +static int i2c_dw_init(struct dw_i2c_dev *dev) { u32 input_clock_khz = clk_get_rate(dev->clk) / 1000; u32 ic_con, hcnt, lcnt; + u32 reg; + + /* Configure register endianess access */ + reg = dw_readl(dev, DW_IC_COMP_TYPE); + if (reg == ___constant_swab32(DW_IC_COMP_TYPE_VALUE)) { + dev->swab = 1; + reg = DW_IC_COMP_TYPE_VALUE; + } + + if (reg != DW_IC_COMP_TYPE_VALUE) { + dev_err(dev->dev, "Unknown Synopsys component type: " + "0x%08x\n", reg); + return -ENODEV; + } /* Disable the adapter */ dw_writel(dev, 0, DW_IC_ENABLE); @@ -351,6 +365,7 @@ static void i2c_dw_init(struct dw_i2c_dev *dev) ic_con = DW_IC_CON_MASTER | DW_IC_CON_SLAVE_DISABLE | DW_IC_CON_RESTART_EN | DW_IC_CON_SPEED_FAST; dw_writel(dev, ic_con, DW_IC_CON); + return 0; } /* @@ -770,21 +785,14 @@ static int __devinit dw_i2c_probe(struct platform_device *pdev) goto err_unuse_clocks; } - reg = dw_readl(dev, DW_IC_COMP_TYPE); - if (reg == ___constant_swab32(0x44570140)) - dev->swab = 1; - else if (reg != 0x44570140) { - dev_err(&pdev->dev, "Unknown Synopsys component type: " - "0x%08x\n", reg); - r = -ENODEV; - goto err_iounmap; - } + r = i2c_dw_init(dev); + if (r) + goto err_unuse_clocks; reg = dw_readl(dev, DW_IC_COMP_PARAM_1); dev->tx_fifo_depth = ((reg >> 16) & 0xff) + 1; dev->rx_fifo_depth = ((reg >> 8) & 0xff) + 1; - i2c_dw_init(dev); dw_writel(dev, 0, DW_IC_INTR_MASK); /* disable IRQ */ r = request_irq(dev->irq, i2c_dw_isr, IRQF_DISABLED, pdev->name, dev); |