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Message-ID: <20150807073854.GA6935@shlinux1.ap.freescale.net>
Date: Fri, 7 Aug 2015 15:38:56 +0800
From: Dong Aisheng <aisheng.dong@...escale.com>
To: Haibo Chen <haibo.chen@...escale.com>
CC: <robh+dt@...nel.org>, <pawel.moll@....com>, <mark.rutland@....com>,
<ijc+devicetree@...lion.org.uk>, <galak@...eaurora.org>,
<shawnguo@...nel.org>, <kernel@...gutronix.de>,
<linux@....linux.org.uk>, <ulf.hansson@...aro.org>,
<johan.derycke@...co.com>, <mkl@...gutronix.de>,
<fabio.estevam@...escale.com>, <b29396@...escale.com>,
<devicetree@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
<linux-arm-kernel@...ts.infradead.org>, <linux-mmc@...r.kernel.org>
Subject: Re: [PATCH v4 1/6] mmc: sdhci-esdhc-imx: add imx7d support and
support HS400
On Wed, Aug 05, 2015 at 06:38:37PM +0800, Haibo Chen wrote:
> The imx7d usdhc is derived from imx6sx, the difference is that
> imx7d support HS400.
>
> So introduce a new compatible string for imx7d and add HS400
> support for imx7d usdhc.
>
> Signed-off-by: Haibo Chen <haibo.chen@...escale.com>
> ---
> drivers/mmc/host/sdhci-esdhc-imx.c | 81 ++++++++++++++++++++++++++++++++++++++
> 1 file changed, 81 insertions(+)
>
> diff --git a/drivers/mmc/host/sdhci-esdhc-imx.c b/drivers/mmc/host/sdhci-esdhc-imx.c
> index c6b9f64..48f009c 100644
> --- a/drivers/mmc/host/sdhci-esdhc-imx.c
> +++ b/drivers/mmc/host/sdhci-esdhc-imx.c
> @@ -44,6 +44,7 @@
> #define ESDHC_MIX_CTRL_EXE_TUNE (1 << 22)
> #define ESDHC_MIX_CTRL_SMPCLK_SEL (1 << 23)
> #define ESDHC_MIX_CTRL_FBCLK_SEL (1 << 25)
> +#define ESDHC_MIX_CTRL_HS400_EN (1 << 26)
> /* Bits 3 and 6 are not SDHCI standard definitions */
> #define ESDHC_MIX_CTRL_SDHCI_MASK 0xb7
> /* Tuning bits */
> @@ -60,6 +61,16 @@
> #define ESDHC_TUNE_CTRL_MIN 0
> #define ESDHC_TUNE_CTRL_MAX ((1 << 7) - 1)
>
> +/* strobe dll register */
> +#define ESDHC_STROBE_DLL_CTRL 0x70
> +#define ESDHC_STROBE_DLL_CTRL_ENABLE (1 << 0)
> +#define ESDHC_STROBE_DLL_CTRL_RESET (1 << 1)
> +#define ESDHC_STROBE_DLL_CTRL_SLV_DLY_TARGET_SHIFT 3
> +
> +#define ESDHC_STROBE_DLL_STATUS 0x74
> +#define ESDHC_STROBE_DLL_STS_REF_LOCK (1 << 1)
> +#define ESDHC_STROBE_DLL_STS_SLV_LOCK 0x1
> +
> #define ESDHC_TUNING_CTRL 0xcc
> #define ESDHC_STD_TUNING_EN (1 << 24)
> /* NOTE: the minimum valid tuning start tap for mx6sl is 1 */
> @@ -120,6 +131,11 @@
> #define ESDHC_FLAG_ERR004536 BIT(7)
> /* The IP supports HS200 mode */
> #define ESDHC_FLAG_HS200 BIT(8)
> +/* The IP supports HS400 mode */
> +#define ESDHC_FLAG_HS400 BIT(9)
> +
> +/* A higher clock ferquency than this rate requires strobell dll control */
> +#define ESDHC_STROBE_DLL_CLK_FREQ 100000000
>
> struct esdhc_soc_data {
> u32 flags;
> @@ -156,6 +172,12 @@ static struct esdhc_soc_data usdhc_imx6sx_data = {
> | ESDHC_FLAG_HAVE_CAP1 | ESDHC_FLAG_HS200,
> };
>
> +static struct esdhc_soc_data usdhc_imx7d_data = {
> + .flags = ESDHC_FLAG_USDHC | ESDHC_FLAG_STD_TUNING
> + | ESDHC_FLAG_HAVE_CAP1 | ESDHC_FLAG_HS200
> + | ESDHC_FLAG_HS400,
> +};
> +
> struct pltfm_imx_data {
> u32 scratchpad;
> struct pinctrl *pinctrl;
> @@ -199,6 +221,7 @@ static const struct of_device_id imx_esdhc_dt_ids[] = {
> { .compatible = "fsl,imx6sx-usdhc", .data = &usdhc_imx6sx_data, },
> { .compatible = "fsl,imx6sl-usdhc", .data = &usdhc_imx6sl_data, },
> { .compatible = "fsl,imx6q-usdhc", .data = &usdhc_imx6q_data, },
> + { .compatible = "fsl,imx7d-usdhc", .data = &usdhc_imx7d_data, },
> { /* sentinel */ }
> };
> MODULE_DEVICE_TABLE(of, imx_esdhc_dt_ids);
> @@ -274,6 +297,9 @@ static u32 esdhc_readl_le(struct sdhci_host *host, int reg)
> val = SDHCI_SUPPORT_DDR50 | SDHCI_SUPPORT_SDR104
> | SDHCI_SUPPORT_SDR50
> | SDHCI_USE_SDR50_TUNING;
> +
> + if (imx_data->socdata->flags & ESDHC_FLAG_HS400)
> + val |= SDHCI_SUPPORT_HS400;
> }
> }
>
> @@ -774,6 +800,7 @@ static int esdhc_change_pinstate(struct sdhci_host *host,
> break;
> case MMC_TIMING_UHS_SDR104:
> case MMC_TIMING_MMC_HS200:
> + case MMC_TIMING_MMC_HS400:
> pinctrl = imx_data->pins_200mhz;
> break;
> default:
> @@ -784,6 +811,44 @@ static int esdhc_change_pinstate(struct sdhci_host *host,
> return pinctrl_select_state(imx_data->pinctrl, pinctrl);
> }
>
> +/*
> + * For HS400 eMMC, there is a data_strobe line, this signal is generated
> + * by the device and used for data output and CRC status response output
> + * in HS400 mode. The frequency of this signal follows the frequency of
> + * CLK generated by host. Host receive the data which is aligned to the
> + * edge of data_strobe line. Due to the time delay between CLK line and
> + * data_strobe line, if the delay time is larger than one clock cycle,
> + * then CLK and data_strobe line will misaligned, read error shows up.
> + * So when the CLK is higher than 100MHz, each clock cycle is short enough,
> + * host should config the delay target.
> + */
> +static void esdhc_set_strobe_dll(struct sdhci_host *host)
> +{
> + u32 v;
> +
> + if (host->mmc->actual_clock > ESDHC_STROBE_DLL_CLK_FREQ) {
> + /* force a reset on strobe dll */
> + writel(ESDHC_STROBE_DLL_CTRL_RESET,
> + host->ioaddr + ESDHC_STROBE_DLL_CTRL);
> + /*
> + * enable strobe dll ctrl and adjust the delay target
> + * for the uSDHC loopback read clock
> + */
> + v = ESDHC_STROBE_DLL_CTRL_ENABLE |
> + (7 << ESDHC_STROBE_DLL_CTRL_SLV_DLY_TARGET_SHIFT);
> + writel(v, host->ioaddr + ESDHC_STROBE_DLL_CTRL);
> + /* wait 1us to make sure strobe dll status register stable */
> + udelay(1);
> + v = readl(host->ioaddr + ESDHC_STROBE_DLL_STATUS);
> + if (!(v & ESDHC_STROBE_DLL_STS_REF_LOCK))
> + dev_warn(mmc_dev(host->mmc),
> + "warning! HS400 strobe DLL status REF not lock!\n");
> + if (!(v & ESDHC_STROBE_DLL_STS_SLV_LOCK))
> + dev_warn(mmc_dev(host->mmc),
> + "warning! HS400 strobe DLL status SLV not lock!\n");
> + }
> +}
> +
> static void esdhc_set_uhs_signaling(struct sdhci_host *host, unsigned timing)
> {
> struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host);
> @@ -795,7 +860,13 @@ static void esdhc_set_uhs_signaling(struct sdhci_host *host, unsigned timing)
> case MMC_TIMING_UHS_SDR25:
> case MMC_TIMING_UHS_SDR50:
> case MMC_TIMING_UHS_SDR104:
> + break;
> case MMC_TIMING_MMC_HS200:
> + /* disable ddr mode and disable HS400 mode */
> + writel(readl(host->ioaddr + ESDHC_MIX_CTRL) &
> + ~(ESDHC_MIX_CTRL_DDREN | ESDHC_MIX_CTRL_HS400_EN),
> + host->ioaddr + ESDHC_MIX_CTRL);
> + imx_data->is_ddr = 0;
Can you please explain why need above code?
Any issues if not do it?
Regards
Dong Aisheng
> break;
> case MMC_TIMING_UHS_DDR50:
> case MMC_TIMING_MMC_DDR52:
> @@ -813,6 +884,13 @@ static void esdhc_set_uhs_signaling(struct sdhci_host *host, unsigned timing)
> writel(v, host->ioaddr + ESDHC_DLL_CTRL);
> }
> break;
> + case MMC_TIMING_MMC_HS400:
> + writel(readl(host->ioaddr + ESDHC_MIX_CTRL) |
> + ESDHC_MIX_CTRL_DDREN | ESDHC_MIX_CTRL_HS400_EN,
> + host->ioaddr + ESDHC_MIX_CTRL);
> + imx_data->is_ddr = 1;
> + esdhc_set_strobe_dll(host);
> + break;
> }
>
> esdhc_change_pinstate(host, timing);
> @@ -1100,6 +1178,9 @@ static int sdhci_esdhc_imx_probe(struct platform_device *pdev)
> if (imx_data->socdata->flags & ESDHC_FLAG_ERR004536)
> host->quirks |= SDHCI_QUIRK_BROKEN_ADMA;
>
> + if (imx_data->socdata->flags & ESDHC_FLAG_HS400)
> + host->quirks2 |= SDHCI_QUIRK2_CAPS_BIT63_FOR_HS400;
> +
> if (of_id)
> err = sdhci_esdhc_imx_probe_dt(pdev, host, imx_data);
> else
> --
> 1.9.1
>
--
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