Hi Jaehoon,
On Mon, April 14, 2014, Jaehoon Chung wrote:
> 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".
The related patch has been posted with this.
"[PATCH 6/7] ARM: dts: drop dw-mshc-ciu-div property from Exynos"
Please can you check?
Thanks,
Seungwon Jeon
>
> 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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