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i2c-designware: Move checking of IP core version to i2c_dw_init() 

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>
This commit is contained in:
Dirk Brandewie 2011-10-06 11:26:28 -07:00 committed by Ben Dooks
parent 18c4089e6c
commit 4a423a8c81
1 changed files with 19 additions and 11 deletions
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30
drivers/i2c/busses/i2c-designware.c
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@ -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 * This function is called during I2C init function, and in case of timeout at
* run time. * 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 input_clock_khz = clk_get_rate(dev->clk) / 1000;
u32 ic_con, hcnt, lcnt; 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 */ /* Disable the adapter */
dw_writel(dev, 0, DW_IC_ENABLE); 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 | ic_con = DW_IC_CON_MASTER | DW_IC_CON_SLAVE_DISABLE |
DW_IC_CON_RESTART_EN | DW_IC_CON_SPEED_FAST; DW_IC_CON_RESTART_EN | DW_IC_CON_SPEED_FAST;
dw_writel(dev, ic_con, DW_IC_CON); 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; goto err_unuse_clocks;
} }
reg = dw_readl(dev, DW_IC_COMP_TYPE); r = i2c_dw_init(dev);
if (reg == ___constant_swab32(0x44570140)) if (r)
dev->swab = 1; goto err_unuse_clocks;
else if (reg != 0x44570140) {
dev_err(&pdev->dev, "Unknown Synopsys component type: "
"0x%08x\n", reg);
r = -ENODEV;
goto err_iounmap;
}
reg = dw_readl(dev, DW_IC_COMP_PARAM_1); reg = dw_readl(dev, DW_IC_COMP_PARAM_1);
dev->tx_fifo_depth = ((reg >> 16) & 0xff) + 1; dev->tx_fifo_depth = ((reg >> 16) & 0xff) + 1;
dev->rx_fifo_depth = ((reg >> 8) & 0xff) + 1; dev->rx_fifo_depth = ((reg >> 8) & 0xff) + 1;
i2c_dw_init(dev);
dw_writel(dev, 0, DW_IC_INTR_MASK); /* disable IRQ */ dw_writel(dev, 0, DW_IC_INTR_MASK); /* disable IRQ */
r = request_irq(dev->irq, i2c_dw_isr, IRQF_DISABLED, pdev->name, dev); r = request_irq(dev->irq, i2c_dw_isr, IRQF_DISABLED, pdev->name, dev);