On 1/15/2011 4:27 AM, [email protected] wrote:
> From: Dirk Brandewie <[email protected]>
>
> Allows CPUs of a given endianness to access a dw controller of a different
> endianness. Endianncess difference is detected at run time through the dw
> component type register.
>
> This is the hand application of a patch set by Jean-Hugues Deschenes
> applied at the sugestion of Shinya Kuribayashi
>
> Signed-off-by: Dirk Brandewie <[email protected]>
> CC: Jean-Hugues Deschenes <[email protected]>
> ---
> drivers/i2c/busses/i2c-designware-core.c | 116
> +++++++++++++++++++-----------
> drivers/i2c/busses/i2c-designware-core.h | 9 ++-
> drivers/i2c/busses/i2c-designware-pci.c | 4 +-
> drivers/i2c/busses/i2c-designware-plat.c | 5 +-
> 4 files changed, 89 insertions(+), 45 deletions(-)
>
Here Dirk-san makes an improvement against a proposed patch from Jean;
moving the component type cheking routines from _probe() function
into i2c_dw_init(). I'd propose to make it as separate patch(es).
> diff --git a/drivers/i2c/busses/i2c-designware-core.c
> b/drivers/i2c/busses/i2c-designware-core.c
> index 6723f9e..746b4bb 100644
> --- a/drivers/i2c/busses/i2c-designware-core.c
> +++ b/drivers/i2c/busses/i2c-designware-core.c
> @@ -137,16 +156,29 @@ 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.
> */
> -void
> +int
> i2c_dw_init(struct dw_i2c_dev *dev)
> {
> u32 input_clock_khz;
> u32 hcnt, lcnt;
> -
> + u32 reg;
> input_clock_khz = i2c_dw_clk_get_rate(dev);
>
> + /* 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 = ___constant_swab32(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 */
> - writel(0, dev->base + DW_IC_ENABLE);
> + dw_writel(dev, 0, DW_IC_ENABLE);
>
> /* set standard and fast speed deviders for high/low periods */
>
Two changes are combined into one patch, while they're separate in
the original Jean's patch. I'd like to see Jean-san's patches as-is
as far as possible.
--
Shinya Kuribayashi
Renesas Electronics
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