Hi, Seungwon.
On 03/26/2014 08:31 PM, Seungwon Jeon wrote:
> ciu_div may not be common value for all speed mode.
> So, it needs to be attached to CLKSEL timing.
>
> Signed-off-by: Seungwon Jeon <tgih.jun@xxxxxxxxxxx>
> ---
> drivers/mmc/host/dw_mmc-exynos.c | 75 ++++++++++++++++++++++++++------------
> drivers/mmc/host/dw_mmc-exynos.h | 1 +
> 2 files changed, 53 insertions(+), 23 deletions(-)
>
> diff --git a/drivers/mmc/host/dw_mmc-exynos.c b/drivers/mmc/host/dw_mmc-exynos.c
> index bab97e9..39f9114 100644
> --- a/drivers/mmc/host/dw_mmc-exynos.c
> +++ b/drivers/mmc/host/dw_mmc-exynos.c
> @@ -39,6 +39,7 @@ struct dw_mci_exynos_priv_data {
> u8 ciu_div;
> u32 sdr_timing;
> u32 ddr_timing;
> + u32 hs200_timing;
> u32 cur_speed;
> };
>
> @@ -64,6 +65,18 @@ static struct dw_mci_exynos_compatible {
> },
> };
>
> +static inline u8 dw_mci_exynos_get_ciu_div(struct dw_mci *host)
> +{
> + struct dw_mci_exynos_priv_data *priv = host->priv;
> +
> + if (priv->ctrl_type == DW_MCI_TYPE_EXYNOS4412)
> + return EXYNOS4412_FIXED_CIU_CLK_DIV;
> + else if (priv->ctrl_type == DW_MCI_TYPE_EXYNOS4210)
> + return EXYNOS4210_FIXED_CIU_CLK_DIV;
> + else
> + return SDMMC_CLKSEL_GET_DIV(mci_readl(host, CLKSEL)) + 1;
> +}
> +
> static int dw_mci_exynos_priv_init(struct dw_mci *host)
> {
> struct dw_mci_exynos_priv_data *priv = host->priv;
> @@ -77,6 +90,8 @@ static int dw_mci_exynos_priv_init(struct dw_mci *host)
> SDMMC_MPSCTRL_NON_SECURE_WRITE_BIT);
> }
>
> + priv->ciu_div = dw_mci_exynos_get_ciu_div(host);
> +
> return 0;
> }
>
> @@ -84,7 +99,7 @@ static int dw_mci_exynos_setup_clock(struct dw_mci *host)
> {
> struct dw_mci_exynos_priv_data *priv = host->priv;
>
> - host->bus_hz /= (priv->ciu_div + 1);
> + host->bus_hz /= priv->ciu_div;
>
> return 0;
> }
> @@ -151,9 +166,10 @@ static void dw_mci_exynos_set_ios(struct dw_mci *host, struct mmc_ios *ios)
> struct dw_mci_exynos_priv_data *priv = host->priv;
> unsigned int wanted = ios->clock;
> unsigned long actual;
> - u8 div = priv->ciu_div + 1;
>
> - if (ios->timing == MMC_TIMING_MMC_DDR52) {
> + if (ios->timing == MMC_TIMING_MMC_HS200) {
> + mci_writel(host, CLKSEL, priv->hs200_timing);
> + } else if (ios->timing == MMC_TIMING_MMC_DDR52) {
> mci_writel(host, CLKSEL, priv->ddr_timing);
> /* Should be double rate for DDR mode */
> if (ios->bus_width == MMC_BUS_WIDTH_8)
> @@ -174,6 +190,7 @@ static void dw_mci_exynos_set_ios(struct dw_mci *host, struct mmc_ios *ios)
> wanted = EXYNOS_CCLKIN_MIN;
>
> if (wanted != priv->cur_speed) {
> + u8 div = dw_mci_exynos_get_ciu_div(host);
> int ret = clk_set_rate(host->ciu_clk, wanted * div);
> if (ret)
> dev_warn(host->dev,
> @@ -186,14 +203,34 @@ static void dw_mci_exynos_set_ios(struct dw_mci *host, struct mmc_ios *ios)
> }
> }
>
> +static int dw_mci_exynos_dt_populate_timing(struct dw_mci *host,
> + unsigned int ctrl_type,
> + const char *propname,
> + u32 *out_values)
> +{
> + struct device_node *np = host->dev->of_node;
> + u32 timing[3];
> + int ret;
> +
> + ret = of_property_read_u32_array(np, propname, timing, 3);
> + if (ret)
> + return ret;
> +
> + if (ctrl_type == DW_MCI_TYPE_EXYNOS4412 ||
> + ctrl_type == DW_MCI_TYPE_EXYNOS4210)
> + timing[2] = 0;
> +
> + *out_values = SDMMC_CLKSEL_TIMING(timing[0], timing[1], timing[2]);
> +
> + return 0;
> +}
> +
> +
> static int dw_mci_exynos_parse_dt(struct dw_mci *host)
> {
> struct dw_mci_exynos_priv_data *priv;
> struct device_node *np = host->dev->of_node;
> - u32 timing[2];
> - u32 div = 0;
> - int idx;
> - int ret;
> + int idx, ret;
>
> priv = devm_kzalloc(host->dev, sizeof(*priv), GFP_KERNEL);
> if (!priv) {
> @@ -206,29 +243,21 @@ static int dw_mci_exynos_parse_dt(struct dw_mci *host)
> priv->ctrl_type = exynos_compat[idx].ctrl_type;
> }
>
> - if (priv->ctrl_type == DW_MCI_TYPE_EXYNOS4412)
> - priv->ciu_div = EXYNOS4412_FIXED_CIU_CLK_DIV - 1;
> - else if (priv->ctrl_type == DW_MCI_TYPE_EXYNOS4210)
> - priv->ciu_div = EXYNOS4210_FIXED_CIU_CLK_DIV - 1;
> - else {
> - of_property_read_u32(np, "samsung,dw-mshc-ciu-div", &div);
> - priv->ciu_div = div;
> - }
Did you remove the property of "ciu-div"?
I didn't find anywhere it's used, when this is removed.
Then it needs to remove the properties into device-tree.
And i want to maintain the property of "ciu-div".
Best Regards,
Jaehoon Chung
> -
> - ret = of_property_read_u32_array(np,
> - "samsung,dw-mshc-sdr-timing", timing, 2);
> + ret = dw_mci_exynos_dt_populate_timing(host, priv->ctrl_type,
> + "samsung,dw-mshc-sdr-timing", &priv->sdr_timing);
> if (ret)
> return ret;
>
> - priv->sdr_timing = SDMMC_CLKSEL_TIMING(timing[0], timing[1], div);
> -
> - ret = of_property_read_u32_array(np,
> - "samsung,dw-mshc-ddr-timing", timing, 2);
> + ret = dw_mci_exynos_dt_populate_timing(host, priv->ctrl_type,
> + "samsung,dw-mshc-ddr-timing", &priv->ddr_timing);
> if (ret)
> return ret;
>
> - priv->ddr_timing = SDMMC_CLKSEL_TIMING(timing[0], timing[1], div);
> + dw_mci_exynos_dt_populate_timing(host, priv->ctrl_type,
> + "samsung,dw-mshc-hs200-timing", &priv->hs200_timing);
> +
> host->priv = priv;
> +
> return 0;
> }
>
> diff --git a/drivers/mmc/host/dw_mmc-exynos.h b/drivers/mmc/host/dw_mmc-exynos.h
> index 2554e2f..2c8c228 100644
> --- a/drivers/mmc/host/dw_mmc-exynos.h
> +++ b/drivers/mmc/host/dw_mmc-exynos.h
> @@ -20,6 +20,7 @@
> #define SDMMC_CLKSEL_CCLK_DRIVE(x) (((x) & 7) << 16)
> #define SDMMC_CLKSEL_CCLK_DIVIDER(x) (((x) & 7) << 24)
> #define SDMMC_CLKSEL_GET_DRV_WD3(x) (((x) >> 16) & 0x7)
> +#define SDMMC_CLKSEL_GET_DIV(x) (((x) >> 24) & 0x7)
> #define SDMMC_CLKSEL_TIMING(x, y, z) (SDMMC_CLKSEL_CCLK_SAMPLE(x) | \
> SDMMC_CLKSEL_CCLK_DRIVE(y) | \
> SDMMC_CLKSEL_CCLK_DIVIDER(z))
>
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