On Wed, Jan 13, 2010 at 02:32:26PM -0500, Jean-Hugues Deschenes wrote:
> Designware component type register is checked before attaching to the device.
>
> ---
> drivers/i2c/busses/i2c-designware.c | 11 +++++++++++
> 1 file changed, 11 insertions(+)
>
> Index: linux-2.6_i2c/drivers/i2c/busses/i2c-designware.c
> ===================================================================
> --- linux-2.6_i2c.orig/drivers/i2c/busses/i2c-designware.c
> +++ linux-2.6_i2c/drivers/i2c/busses/i2c-designware.c
> @@ -68,6 +68,7 @@
> #define DW_IC_TXFLR 0x74
> #define DW_IC_RXFLR 0x78
> #define DW_IC_COMP_PARAM_1 0xf4
> +#define DW_IC_COMP_TYPE 0xfc
> #define DW_IC_TX_ABRT_SOURCE 0x80
>
> #define DW_IC_CON_MASTER 0x1
> @@ -756,6 +757,16 @@ static int __devinit dw_i2c_probe(struct
> goto err_unuse_clocks;
> }
> {
> + u32 comp_type = i2c_dw_readl(dev, DW_IC_COMP_TYPE);
> +
> + if (0x44570140 != comp_type) {
> + dev_err(&pdev->dev, "Unknown Synopsys component type: "
> + "0x%08x\n", comp_type);
> + r = -ENODEV;
> + goto err_iounmap;
> + }
> + }
> + {
The general convention in linux is to do (if x = constant).
> u32 param1 = i2c_dw_readl(dev, DW_IC_COMP_PARAM_1);
>
> dev->tx_fifo_depth = ((param1 >> 16) & 0xff) + 1;
>
> --
--
--
Ben
Q: What's a light-year?
A: One-third less calories than a regular year.
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