linux-kernel - Re: [PATCH] mmc: dw_mmc: add support for RK3288.

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Date:	Mon, 07 Jul 2014 11:07:08 +0900
From:	Jaehoon Chung <jh80.chung@...sung.com>
To:	addy ke <addy.ke@...k-chips.com>, robh+dt@...nel.org,
	pawel.moll@....com, mark.rutland@....com,
	ijc+devicetree@...lion.org.uk, galak@...eaurora.org,
	rdunlap@...radead.org, tgih.jun@...sung.com, chris@...ntf.net,
	ulf.hansson@...aro.org, dinguyen@...era.com, heiko@...ech.de,
	olof@...om.net
Cc:	devicetree@...r.kernel.org, linux-doc@...r.kernel.org,
	linux-kernel@...r.kernel.org, linux-mmc@...r.kernel.org,
	hj@...k-chips.com, kever.yang@...k-chips.com, xjq@...k-chips.com,
	huangtao@...k-chips.com, zyw@...k-chips.com, yzq@...k-chips.com,
	zhenfu.fang@...k-chips.com, cf@...k-chips.com,
	zhangqing@...k-chips.com, hl@...k-chips.com, lintao@...k-chips.com,
	chenfen@...k-chips.com, zyf@...k-chips.com
Subject: Re: [PATCH] mmc: dw_mmc: add support for RK3288.

Hi, Addy,

On 07/05/2014 09:59 PM, addy ke wrote:
> This patch focuses on clock setting for RK3288 mmc controller.
> 
> In RK3288 mmc controller, CLKDIV register can only be set 0 or 1,
> and if DDR 8bit mode, CLKDIV register must be set 1.
> 
> Signed-off-by: addy ke <addy.ke@...k-chips.com>
> ---
>  .../devicetree/bindings/mmc/rockchip-dw-mshc.txt   |  4 +-
>  drivers/mmc/host/dw_mmc-pltfm.c                    | 50 +++++++++++++++++++++-
>  2 files changed, 51 insertions(+), 3 deletions(-)
> 
> diff --git a/Documentation/devicetree/bindings/mmc/rockchip-dw-mshc.txt b/Documentation/devicetree/bindings/mmc/rockchip-dw-mshc.txt
> index c559f3f..e3f95cd 100644
> --- a/Documentation/devicetree/bindings/mmc/rockchip-dw-mshc.txt
> +++ b/Documentation/devicetree/bindings/mmc/rockchip-dw-mshc.txt
> @@ -10,7 +10,9 @@ extensions to the Synopsys Designware Mobile Storage Host Controller.
>  Required Properties:
>  
>  * compatible: should be
> -	- "rockchip,rk2928-dw-mshc": for Rockchip RK2928 and following
> +	- "rockchip,rk2928-dw-mshc": for Rockchip RK2928 and following,
> +							before RK3288
> +	- "rockchip,rk3288-dw-mshc": for Rockchip RK3288
>  
>  Example:
>  
> diff --git a/drivers/mmc/host/dw_mmc-pltfm.c b/drivers/mmc/host/dw_mmc-pltfm.c
> index d4a47a9..15d796e 100644
> --- a/drivers/mmc/host/dw_mmc-pltfm.c
> +++ b/drivers/mmc/host/dw_mmc-pltfm.c
> @@ -21,17 +21,61 @@
>  #include <linux/mmc/mmc.h>
>  #include <linux/mmc/dw_mmc.h>
>  #include <linux/of.h>
> +#include <linux/clk.h>
>  
>  #include "dw_mmc.h"
>  #include "dw_mmc-pltfm.h"
>  
> +#define RK3288_CLKGEN_DIV	2
"2" is used to the general div value at rockchip?

> +
>  static void dw_mci_pltfm_prepare_command(struct dw_mci *host, u32 *cmdr)
>  {
>  	*cmdr |= SDMMC_CMD_USE_HOLD_REG;
>  }
>  
> -static const struct dw_mci_drv_data rockchip_drv_data = {
> +static int dw_mci_rk3288_setup_clock(struct dw_mci *host)
> +{
> +	host->bus_hz = clk_get_rate(host->ciu_clk) / RK3288_CLKGEN_DIV;
I knew that you need not to call clk_get_rate(). In dw-mmc.c, it's already called.
So you can just use the host->bus_hz.

host->bus_hz /= RK3288_CLKGEN_DIV;

Best Regards,
Jaehoon Chung

> +
> +	return 0;
> +}
> +
> +static void dw_mci_rk3288_set_ios(struct dw_mci *host, struct mmc_ios *ios)
> +{
> +	int ret;
> +	unsigned int cclkin;
> +
> +	/*
> +	 * cclkin: source clock of mmc controller.
> +	 * bus_hz: card interface clock generated by CLKGEN.
> +	 * bus_hz = cclkin / RK3288_CLKGEN_DIV;
> +	 * ios->clock = (div == 0) ? bus_hz : (bus_hz / (2 * div))
> +	 *
> +	 * Note: div can only be 0 or 1
> +	 *       if DDR50 8bit mode, div must be set 1
> +	 */
> +	if ((ios->bus_width == MMC_BUS_WIDTH_8) &&
> +	    (ios->timing == MMC_TIMING_UHS_DDR50 ||
> +	     ios->timing == MMC_TIMING_MMC_DDR52))
> +		cclkin = 2 * ios->clock * RK3288_CLKGEN_DIV;
> +	else
> +		cclkin = ios->clock * RK3288_CLKGEN_DIV;
> +
> +	ret = clk_set_rate(host->ciu_clk, cclkin);
> +	if (ret)
> +		dev_warn(host->dev, "failed to set rate %uHz\n", ios->clock);
> +
> +	host->bus_hz = clk_get_rate(host->ciu_clk) / RK3288_CLKGEN_DIV;
> +}
> +
> +static const struct dw_mci_drv_data rk2928_drv_data = {
> +	.prepare_command	= dw_mci_pltfm_prepare_command,
> +};
> +
> +static const struct dw_mci_drv_data rk3288_drv_data = {
>  	.prepare_command	= dw_mci_pltfm_prepare_command,
> +	.set_ios	= dw_mci_rk3288_set_ios,
> +	.setup_clock	= dw_mci_rk3288_setup_clock,
>  };
>  
>  static const struct dw_mci_drv_data socfpga_drv_data = {
> @@ -95,7 +139,9 @@ EXPORT_SYMBOL_GPL(dw_mci_pltfm_pmops);
>  static const struct of_device_id dw_mci_pltfm_match[] = {
>  	{ .compatible = "snps,dw-mshc", },
>  	{ .compatible = "rockchip,rk2928-dw-mshc",
> -		.data = &rockchip_drv_data },
> +		.data = &rk2928_drv_data },
> +	{ .compatible = "rockchip,rk3288-dw-mshc",
> +		.data = &rk3288_drv_data },
>  	{ .compatible = "altr,socfpga-dw-mshc",
>  		.data = &socfpga_drv_data },
>  	{},
> 

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