linux-kernel - Re: [PATCH] i2c: xgene-slimpro: Support v2

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Date:   Sat, 28 Oct 2017 14:11:36 +0200
From:   Wolfram Sang <wsa@...-dreams.de>
To:     Hoan Tran <hotran@....com>,
        Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
Cc:     linux-i2c@...r.kernel.org, linux-kernel@...r.kernel.org,
        Loc Ho <lho@....com>, patches@....com
Subject: Re: [PATCH] i2c: xgene-slimpro: Support v2


Thanks for the patch!

On Mon, Oct 23, 2017 at 03:12:20PM -0700, Hoan Tran wrote:
> This patch supports xgene-slimpro-i2c v2 which uses the non-cachable memory
> as the PCC shared memory.
> 
> Signed-off-by: Hoan Tran <hotran@....com>

I can't tell if __force is justified here but I don't know much about
ACPI... Andy, can you have a look?

> ---
>  drivers/i2c/busses/i2c-xgene-slimpro.c | 45 +++++++++++++++++++++++++---------
>  1 file changed, 34 insertions(+), 11 deletions(-)
> 
> diff --git a/drivers/i2c/busses/i2c-xgene-slimpro.c b/drivers/i2c/busses/i2c-xgene-slimpro.c
> index 7e89ba6..31314d8 100644
> --- a/drivers/i2c/busses/i2c-xgene-slimpro.c
> +++ b/drivers/i2c/busses/i2c-xgene-slimpro.c
> @@ -129,6 +129,11 @@ struct slimpro_i2c_dev {
>  #define to_slimpro_i2c_dev(cl)	\
>  		container_of(cl, struct slimpro_i2c_dev, mbox_client)
>  
> +enum slimpro_i2c_version {
> +	XGENE_SLIMPRO_I2C_V1 = 0,
> +	XGENE_SLIMPRO_I2C_V2 = 1,
> +};
> +
>  /*
>   * This function tests and clears a bitmask then returns its old value
>   */
> @@ -446,6 +451,15 @@ static u32 xgene_slimpro_i2c_func(struct i2c_adapter *adapter)
>  	.functionality = xgene_slimpro_i2c_func,
>  };
>  
> +#ifdef CONFIG_ACPI
> +static const struct acpi_device_id xgene_slimpro_i2c_acpi_ids[] = {
> +	{"APMC0D40", XGENE_SLIMPRO_I2C_V1},
> +	{"APMC0D8B", XGENE_SLIMPRO_I2C_V2},
> +	{}
> +};
> +MODULE_DEVICE_TABLE(acpi, xgene_slimpro_i2c_acpi_ids);
> +#endif
> +
>  static int xgene_slimpro_i2c_probe(struct platform_device *pdev)
>  {
>  	struct slimpro_i2c_dev *ctx;
> @@ -476,6 +490,17 @@ static int xgene_slimpro_i2c_probe(struct platform_device *pdev)
>  		}
>  	} else {
>  		struct acpi_pcct_hw_reduced *cppc_ss;
> +		int version = XGENE_SLIMPRO_I2C_V1;
> +#ifdef CONFIG_ACPI
> +		const struct acpi_device_id *acpi_id;
> +
> +		acpi_id = acpi_match_device(xgene_slimpro_i2c_acpi_ids,
> +					    &pdev->dev);
> +		if (!acpi_id)
> +			return -EINVAL;
> +
> +		version = (int)acpi_id->driver_data;
> +#endif
>  
>  		if (device_property_read_u32(&pdev->dev, "pcc-channel",
>  					     &ctx->mbox_idx))
> @@ -514,9 +539,15 @@ static int xgene_slimpro_i2c_probe(struct platform_device *pdev)
>  		 */
>  		ctx->comm_base_addr = cppc_ss->base_address;
>  		if (ctx->comm_base_addr) {
> -			ctx->pcc_comm_addr = memremap(ctx->comm_base_addr,
> -						      cppc_ss->length,
> -						      MEMREMAP_WB);
> +			if (version == XGENE_SLIMPRO_I2C_V2)
> +				ctx->pcc_comm_addr = (void __force *)ioremap(
> +							ctx->comm_base_addr,
> +							cppc_ss->length);
> +			else
> +				ctx->pcc_comm_addr = memremap(
> +							ctx->comm_base_addr,
> +							cppc_ss->length,
> +							MEMREMAP_WB);
>  		} else {
>  			dev_err(&pdev->dev, "Failed to get PCC comm region\n");
>  			rc = -ENOENT;
> @@ -579,14 +610,6 @@ static int xgene_slimpro_i2c_remove(struct platform_device *pdev)
>  };
>  MODULE_DEVICE_TABLE(of, xgene_slimpro_i2c_dt_ids);
>  
> -#ifdef CONFIG_ACPI
> -static const struct acpi_device_id xgene_slimpro_i2c_acpi_ids[] = {
> -	{"APMC0D40", 0},
> -	{}
> -};
> -MODULE_DEVICE_TABLE(acpi, xgene_slimpro_i2c_acpi_ids);
> -#endif
> -
>  static struct platform_driver xgene_slimpro_i2c_driver = {
>  	.probe	= xgene_slimpro_i2c_probe,
>  	.remove	= xgene_slimpro_i2c_remove,
> -- 
> 1.9.1
> 

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