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Subject[PATCH 04/13] i2c-designware: Move checking of IP core version to i2c_dw_init()
Date
From: Dirk Brandewie <dirk.brandewie@gmail.com>

Move checking IP core version to i2c_dw_init() in preparation for
splitting i2c-designware.c into core and bus specific portions.

Signed-off-by: Dirk Brandewie <dirk.brandewie@gmail.com>
Signed-off-by: Ben Dooks <ben-linux@fluff.org>
---
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 680f7c9..e5c2362 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);
--
1.7.3.4


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