Re: [PATCH v2 2/2] mmc: sdhci-milbeaut: add Milbeaut SD controller driver

From: Ulf Hansson
Date: Mon Jun 03 2019 - 09:53:01 EST

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+ Adrian

On Thu, 30 May 2019 at 11:20, Takao Orito <orito.takao@xxxxxxxxxxxxx> wrote:
>
> SD Host controller on Milbeaut consists of two controller parts.
> One is core controller F_SDH30, this is similar to sdhci-fujitsu
> controller.
> Another is bridge controller.
> This bridge controller is not compatible with sdhci-fujitsu controller.
> This is special for Milbeaut series. This has some functions.
> For example, reset control, clock enable/select for SDR50/25/12, set
> property of SD physical pins, retuning control, set capabilityies.
>
> This bridge controller requires special procedures at reset or clock
> enablement or change for further tuning of clock.
>
> Signed-off-by: Takao Orito <orito.takao@xxxxxxxxxxxxx>

This looks good to me, however I have looped in Adrian who maintains
SDHCI drivers, to allow him to provide some input.

Kind regards
Uffe

> ---
> drivers/mmc/host/Kconfig | 11 ++
> drivers/mmc/host/Makefile | 1 +
> drivers/mmc/host/sdhci-milbeaut.c | 362 ++++++++++++++++++++++++++++++++++++++
> drivers/mmc/host/sdhci_f_sdh30.c | 26 +--
> drivers/mmc/host/sdhci_f_sdh30.h | 32 ++++
> 5 files changed, 407 insertions(+), 25 deletions(-)
> create mode 100644 drivers/mmc/host/sdhci-milbeaut.c
> create mode 100644 drivers/mmc/host/sdhci_f_sdh30.h
>
> diff --git a/drivers/mmc/host/Kconfig b/drivers/mmc/host/Kconfig
> index 28fcd8f..9b39111 100644
> --- a/drivers/mmc/host/Kconfig
> +++ b/drivers/mmc/host/Kconfig
> @@ -353,6 +353,17 @@ config MMC_SDHCI_F_SDH30
>
> If unsure, say N.
>
> +config MMC_SDHCI_MILBEAUT
> + tristate "SDHCI support for Socionext Milbeaut Serieas using F_SDH30"
> + depends on MMC_SDHCI_PLTFM
> + depends on OF
> + help
> + This selects the Secure Digital Host Controller Interface (SDHCI)
> + Needed by Milbeaut SoC for MMC / SD / SDIO support.
> + If you have a controller with this interface, say Y or M here.
> +
> + If unsure, say N.
> +
> config MMC_SDHCI_IPROC
> tristate "SDHCI support for the BCM2835 & iProc SD/MMC Controller"
> depends on ARCH_BCM2835 || ARCH_BCM_IPROC || COMPILE_TEST
> diff --git a/drivers/mmc/host/Makefile b/drivers/mmc/host/Makefile
> index 7357871..db98e8a 100644
> --- a/drivers/mmc/host/Makefile
> +++ b/drivers/mmc/host/Makefile
> @@ -21,6 +21,7 @@ obj-$(CONFIG_MMC_SDHCI_PXAV2) += sdhci-pxav2.o
> obj-$(CONFIG_MMC_SDHCI_S3C) += sdhci-s3c.o
> obj-$(CONFIG_MMC_SDHCI_SIRF) += sdhci-sirf.o
> obj-$(CONFIG_MMC_SDHCI_F_SDH30) += sdhci_f_sdh30.o
> +obj-$(CONFIG_MMC_SDHCI_MILBEAUT) += sdhci-milbeaut.o
> obj-$(CONFIG_MMC_SDHCI_SPEAR) += sdhci-spear.o
> obj-$(CONFIG_MMC_SDHCI_AM654) += sdhci_am654.o
> obj-$(CONFIG_MMC_WBSD) += wbsd.o
> diff --git a/drivers/mmc/host/sdhci-milbeaut.c b/drivers/mmc/host/sdhci-milbeaut.c
> new file mode 100644
> index 0000000..a1aa21b
> --- /dev/null
> +++ b/drivers/mmc/host/sdhci-milbeaut.c
> @@ -0,0 +1,362 @@
> +// SPDX-License-Identifier: GPL-2.0
> +/*
> + * Copyright (C) 2013 - 2015 Fujitsu Semiconductor, Ltd
> + * Vincent Yang <vincent.yang@xxxxxxxxxxxxxx>
> + * Copyright (C) 2015 Linaro Ltd Andy Green <andy.green@xxxxxxxxxx>
> + * Copyright (C) 2019 Socionext Inc.
> + * Takao Orito <orito.takao@xxxxxxxxxxxxx>
> + */
> +
> +#include <linux/bits.h>
> +#include <linux/clk.h>
> +#include <linux/delay.h>
> +#include <linux/err.h>
> +#include <linux/gpio/consumer.h>
> +#include <linux/module.h>
> +#include <linux/of.h>
> +#include <linux/property.h>
> +
> +#include "sdhci-pltfm.h"
> +#include "sdhci_f_sdh30.h"
> +
> +/* milbeaut bridge controller register */
> +#define MLB_SOFT_RESET 0x0200
> +#define MLB_SOFT_RESET_RSTX BIT(0)
> +
> +#define MLB_WP_CD_LED_SET 0x0210
> +#define MLB_WP_CD_LED_SET_LED_INV BIT(2)
> +
> +#define MLB_CR_SET 0x0220
> +#define MLB_CR_SET_CR_TOCLKUNIT BIT(24)
> +#define MLB_CR_SET_CR_TOCLKFREQ_SFT (16)
> +#define MLB_CR_SET_CR_TOCLKFREQ_MASK (0x3F << MLB_CR_SET_CR_TOCLKFREQ_SFT)
> +#define MLB_CR_SET_CR_BCLKFREQ_SFT (8)
> +#define MLB_CR_SET_CR_BCLKFREQ_MASK (0xFF << MLB_CR_SET_CR_BCLKFREQ_SFT)
> +#define MLB_CR_SET_CR_RTUNTIMER_SFT (4)
> +#define MLB_CR_SET_CR_RTUNTIMER_MASK (0xF << MLB_CR_SET_CR_RTUNTIMER_SFT)
> +
> +#define MLB_SD_TOCLK_I_DIV 16
> +#define MLB_TOCLKFREQ_UNIT_THRES 16000000
> +#define MLB_CAL_TOCLKFREQ_MHZ(rate) (rate / MLB_SD_TOCLK_I_DIV / 1000000)
> +#define MLB_CAL_TOCLKFREQ_KHZ(rate) (rate / MLB_SD_TOCLK_I_DIV / 1000)
> +#define MLB_TOCLKFREQ_MAX 63
> +#define MLB_TOCLKFREQ_MIN 1
> +
> +#define MLB_SD_BCLK_I_DIV 4
> +#define MLB_CAL_BCLKFREQ(rate) (rate / MLB_SD_BCLK_I_DIV / 1000000)
> +#define MLB_BCLKFREQ_MAX 255
> +#define MLB_BCLKFREQ_MIN 1
> +
> +#define MLB_CDR_SET 0x0230
> +#define MLB_CDR_SET_CLK2POW16 3
> +
> +struct f_sdhost_priv {
> + struct clk *clk_iface;
> + struct clk *clk;
> + struct device *dev;
> + bool enable_cmd_dat_delay;
> +};
> +
> +static void sdhci_milbeaut_soft_voltage_switch(struct sdhci_host *host)
> +{
> + u32 ctrl = 0;
> +
> + usleep_range(2500, 3000);
> + ctrl = sdhci_readl(host, F_SDH30_IO_CONTROL2);
> + ctrl |= F_SDH30_CRES_O_DN;
> + sdhci_writel(host, ctrl, F_SDH30_IO_CONTROL2);
> + ctrl |= F_SDH30_MSEL_O_1_8;
> + sdhci_writel(host, ctrl, F_SDH30_IO_CONTROL2);
> +
> + ctrl &= ~F_SDH30_CRES_O_DN;
> + sdhci_writel(host, ctrl, F_SDH30_IO_CONTROL2);
> + usleep_range(2500, 3000);
> +
> + ctrl = sdhci_readl(host, F_SDH30_TUNING_SETTING);
> + ctrl |= F_SDH30_CMD_CHK_DIS;
> + sdhci_writel(host, ctrl, F_SDH30_TUNING_SETTING);
> +}
> +
> +static unsigned int sdhci_milbeaut_get_min_clock(struct sdhci_host *host)
> +{
> + return F_SDH30_MIN_CLOCK;
> +}
> +
> +static void sdhci_milbeaut_reset(struct sdhci_host *host, u8 mask)
> +{
> + struct f_sdhost_priv *priv = sdhci_priv(host);
> + u16 clk;
> + u32 ctl;
> + ktime_t timeout;
> +
> + clk = sdhci_readw(host, SDHCI_CLOCK_CONTROL);
> + clk = (clk & ~SDHCI_CLOCK_CARD_EN) | SDHCI_CLOCK_INT_EN;
> + sdhci_writew(host, clk, SDHCI_CLOCK_CONTROL);
> +
> + sdhci_reset(host, mask);
> +
> + clk |= SDHCI_CLOCK_CARD_EN;
> + sdhci_writew(host, clk, SDHCI_CLOCK_CONTROL);
> +
> + timeout = ktime_add_ms(ktime_get(), 10);
> + while (1) {
> + bool timedout = ktime_after(ktime_get(), timeout);
> +
> + clk = sdhci_readw(host, SDHCI_CLOCK_CONTROL);
> + if (clk & SDHCI_CLOCK_INT_STABLE)
> + break;
> + if (timedout) {
> + pr_err("%s: Internal clock never stabilised.\n",
> + mmc_hostname(host->mmc));
> + sdhci_dumpregs(host);
> + return;
> + }
> + udelay(10);
> + }
> +
> + if (priv->enable_cmd_dat_delay) {
> + ctl = sdhci_readl(host, F_SDH30_ESD_CONTROL);
> + ctl |= F_SDH30_CMD_DAT_DELAY;
> + sdhci_writel(host, ctl, F_SDH30_ESD_CONTROL);
> + }
> +}
> +
> +static void sdhci_milbeaut_set_power(struct sdhci_host *host,
> + unsigned char mode, unsigned short vdd)
> +{
> + if (!IS_ERR(host->mmc->supply.vmmc)) {
> + struct mmc_host *mmc = host->mmc;
> +
> + mmc_regulator_set_ocr(mmc, mmc->supply.vmmc, vdd);
> + }
> + sdhci_set_power_noreg(host, mode, vdd);
> +}
> +
> +static const struct sdhci_ops sdhci_milbeaut_ops = {
> + .voltage_switch = sdhci_milbeaut_soft_voltage_switch,
> + .get_min_clock = sdhci_milbeaut_get_min_clock,
> + .reset = sdhci_milbeaut_reset,
> + .set_clock = sdhci_set_clock,
> + .set_bus_width = sdhci_set_bus_width,
> + .set_uhs_signaling = sdhci_set_uhs_signaling,
> + .set_power = sdhci_milbeaut_set_power,
> +};
> +
> +static void sdhci_milbeaut_bridge_reset(struct sdhci_host *host,
> + int reset_flag)
> +{
> + if (reset_flag)
> + sdhci_writel(host, 0, MLB_SOFT_RESET);
> + else
> + sdhci_writel(host, MLB_SOFT_RESET_RSTX, MLB_SOFT_RESET);
> +}
> +
> +static void sdhci_milbeaut_bridge_init(struct sdhci_host *host,
> + int rate)
> +{
> + u32 val, clk;
> +
> + /* IO_SDIO_CR_SET should be set while reset */
> + val = sdhci_readl(host, MLB_CR_SET);
> + val &= ~(MLB_CR_SET_CR_TOCLKFREQ_MASK | MLB_CR_SET_CR_TOCLKUNIT |
> + MLB_CR_SET_CR_BCLKFREQ_MASK);
> + if (rate >= MLB_TOCLKFREQ_UNIT_THRES) {
> + clk = MLB_CAL_TOCLKFREQ_MHZ(rate);
> + clk = min_t(u32, MLB_TOCLKFREQ_MAX, clk);
> + val |= MLB_CR_SET_CR_TOCLKUNIT |
> + (clk << MLB_CR_SET_CR_TOCLKFREQ_SFT);
> + } else {
> + clk = MLB_CAL_TOCLKFREQ_KHZ(rate);
> + clk = min_t(u32, MLB_TOCLKFREQ_MAX, clk);
> + clk = max_t(u32, MLB_TOCLKFREQ_MIN, clk);
> + val |= clk << MLB_CR_SET_CR_TOCLKFREQ_SFT;
> + }
> +
> + clk = MLB_CAL_BCLKFREQ(rate);
> + clk = min_t(u32, MLB_BCLKFREQ_MAX, clk);
> + clk = max_t(u32, MLB_BCLKFREQ_MIN, clk);
> + val |= clk << MLB_CR_SET_CR_BCLKFREQ_SFT;
> + val &= ~MLB_CR_SET_CR_RTUNTIMER_MASK;
> + sdhci_writel(host, val, MLB_CR_SET);
> +
> + sdhci_writel(host, MLB_CDR_SET_CLK2POW16, MLB_CDR_SET);
> +
> + sdhci_writel(host, MLB_WP_CD_LED_SET_LED_INV, MLB_WP_CD_LED_SET);
> +}
> +
> +static void sdhci_milbeaut_vendor_init(struct sdhci_host *host)
> +{
> + struct f_sdhost_priv *priv = sdhci_priv(host);
> + u32 ctl;
> +
> + ctl = sdhci_readl(host, F_SDH30_IO_CONTROL2);
> + ctl |= F_SDH30_CRES_O_DN;
> + sdhci_writel(host, ctl, F_SDH30_IO_CONTROL2);
> + ctl &= ~F_SDH30_MSEL_O_1_8;
> + sdhci_writel(host, ctl, F_SDH30_IO_CONTROL2);
> + ctl &= ~F_SDH30_CRES_O_DN;
> + sdhci_writel(host, ctl, F_SDH30_IO_CONTROL2);
> +
> + ctl = sdhci_readw(host, F_SDH30_AHB_CONFIG);
> + ctl |= F_SDH30_SIN | F_SDH30_AHB_INCR_16 | F_SDH30_AHB_INCR_8 |
> + F_SDH30_AHB_INCR_4;
> + ctl &= ~(F_SDH30_AHB_BIGED | F_SDH30_BUSLOCK_EN);
> + sdhci_writew(host, ctl, F_SDH30_AHB_CONFIG);
> +
> + if (priv->enable_cmd_dat_delay) {
> + ctl = sdhci_readl(host, F_SDH30_ESD_CONTROL);
> + ctl |= F_SDH30_CMD_DAT_DELAY;
> + sdhci_writel(host, ctl, F_SDH30_ESD_CONTROL);
> + }
> +}
> +
> +static const struct of_device_id mlb_dt_ids[] = {
> + {
> + .compatible = "socionext,milbeaut-m10v-sdhci-3.0",
> + },
> + { /* sentinel */ }
> +};
> +MODULE_DEVICE_TABLE(of, mlb_dt_ids);
> +
> +static void sdhci_milbeaut_init(struct sdhci_host *host)
> +{
> + struct f_sdhost_priv *priv = sdhci_priv(host);
> + int rate = clk_get_rate(priv->clk);
> + u16 ctl;
> +
> + sdhci_milbeaut_bridge_reset(host, 0);
> +
> + ctl = sdhci_readw(host, SDHCI_CLOCK_CONTROL);
> + ctl &= ~(SDHCI_CLOCK_CARD_EN | SDHCI_CLOCK_INT_EN);
> + sdhci_writew(host, ctl, SDHCI_CLOCK_CONTROL);
> +
> + sdhci_milbeaut_bridge_reset(host, 1);
> +
> + sdhci_milbeaut_bridge_init(host, rate);
> + sdhci_milbeaut_bridge_reset(host, 0);
> +
> + sdhci_milbeaut_vendor_init(host);
> +}
> +
> +static int sdhci_milbeaut_probe(struct platform_device *pdev)
> +{
> + struct sdhci_host *host;
> + struct device *dev = &pdev->dev;
> + struct resource *res;
> + int irq, ret = 0;
> + struct f_sdhost_priv *priv;
> +
> + irq = platform_get_irq(pdev, 0);
> + if (irq < 0) {
> + dev_err(dev, "%s: no irq specified\n", __func__);
> + return irq;
> + }
> +
> + host = sdhci_alloc_host(dev, sizeof(struct f_sdhost_priv));
> + if (IS_ERR(host))
> + return PTR_ERR(host);
> +
> + priv = sdhci_priv(host);
> + priv->dev = dev;
> +
> + host->quirks = SDHCI_QUIRK_NO_ENDATTR_IN_NOPDESC |
> + SDHCI_QUIRK_INVERTED_WRITE_PROTECT |
> + SDHCI_QUIRK_CLOCK_BEFORE_RESET |
> + SDHCI_QUIRK_DELAY_AFTER_POWER;
> + host->quirks2 = SDHCI_QUIRK2_SUPPORT_SINGLE |
> + SDHCI_QUIRK2_TUNING_WORK_AROUND |
> + SDHCI_QUIRK2_PRESET_VALUE_BROKEN;
> +
> + priv->enable_cmd_dat_delay = device_property_read_bool(dev,
> + "fujitsu,cmd-dat-delay-select");
> +
> + ret = mmc_of_parse(host->mmc);
> + if (ret)
> + goto err;
> +
> + platform_set_drvdata(pdev, host);
> +
> + host->hw_name = "f_sdh30";
> + host->ops = &sdhci_milbeaut_ops;
> + host->irq = irq;
> +
> + res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
> + host->ioaddr = devm_ioremap_resource(&pdev->dev, res);
> + if (IS_ERR(host->ioaddr)) {
> + ret = PTR_ERR(host->ioaddr);
> + goto err;
> + }
> +
> + if (dev_of_node(dev)) {
> + sdhci_get_of_property(pdev);
> +
> + priv->clk_iface = devm_clk_get(&pdev->dev, "iface");
> + if (IS_ERR(priv->clk_iface)) {
> + ret = PTR_ERR(priv->clk_iface);
> + goto err;
> + }
> +
> + ret = clk_prepare_enable(priv->clk_iface);
> + if (ret)
> + goto err;
> +
> + priv->clk = devm_clk_get(&pdev->dev, "core");
> + if (IS_ERR(priv->clk)) {
> + ret = PTR_ERR(priv->clk);
> + goto err_clk;
> + }
> +
> + ret = clk_prepare_enable(priv->clk);
> + if (ret)
> + goto err_clk;
> + }
> +
> + sdhci_milbeaut_init(host);
> +
> + ret = sdhci_add_host(host);
> + if (ret)
> + goto err_add_host;
> +
> + return 0;
> +
> +err_add_host:
> + clk_disable_unprepare(priv->clk);
> +err_clk:
> + clk_disable_unprepare(priv->clk_iface);
> +err:
> + sdhci_free_host(host);
> + return ret;
> +}
> +
> +static int sdhci_milbeaut_remove(struct platform_device *pdev)
> +{
> + struct sdhci_host *host = platform_get_drvdata(pdev);
> + struct f_sdhost_priv *priv = sdhci_priv(host);
> +
> + sdhci_remove_host(host, readl(host->ioaddr + SDHCI_INT_STATUS) ==
> + 0xffffffff);
> +
> + clk_disable_unprepare(priv->clk_iface);
> + clk_disable_unprepare(priv->clk);
> +
> + sdhci_free_host(host);
> + platform_set_drvdata(pdev, NULL);
> +
> + return 0;
> +}
> +
> +static struct platform_driver sdhci_milbeaut_driver = {
> + .driver = {
> + .name = "sdhci-milbeaut",
> + .of_match_table = of_match_ptr(mlb_dt_ids),
> + },
> + .probe = sdhci_milbeaut_probe,
> + .remove = sdhci_milbeaut_remove,
> +};
> +
> +module_platform_driver(sdhci_milbeaut_driver);
> +
> +MODULE_DESCRIPTION("MILBEAUT SD Card Controller driver");
> +MODULE_AUTHOR("Takao Orito <orito.takao@xxxxxxxxxxxxx>");
> +MODULE_LICENSE("GPL v2");
> +MODULE_ALIAS("platform:sdhci-milbeaut");
> diff --git a/drivers/mmc/host/sdhci_f_sdh30.c b/drivers/mmc/host/sdhci_f_sdh30.c
> index 485f759..ca4c99a 100644
> --- a/drivers/mmc/host/sdhci_f_sdh30.c
> +++ b/drivers/mmc/host/sdhci_f_sdh30.c
> @@ -19,31 +19,7 @@
> #include <linux/clk.h>
>
> #include "sdhci-pltfm.h"
> -
> -/* F_SDH30 extended Controller registers */
> -#define F_SDH30_AHB_CONFIG 0x100
> -#define F_SDH30_AHB_BIGED 0x00000040
> -#define F_SDH30_BUSLOCK_DMA 0x00000020
> -#define F_SDH30_BUSLOCK_EN 0x00000010
> -#define F_SDH30_SIN 0x00000008
> -#define F_SDH30_AHB_INCR_16 0x00000004
> -#define F_SDH30_AHB_INCR_8 0x00000002
> -#define F_SDH30_AHB_INCR_4 0x00000001
> -
> -#define F_SDH30_TUNING_SETTING 0x108
> -#define F_SDH30_CMD_CHK_DIS 0x00010000
> -
> -#define F_SDH30_IO_CONTROL2 0x114
> -#define F_SDH30_CRES_O_DN 0x00080000
> -#define F_SDH30_MSEL_O_1_8 0x00040000
> -
> -#define F_SDH30_ESD_CONTROL 0x124
> -#define F_SDH30_EMMC_RST 0x00000002
> -#define F_SDH30_EMMC_HS200 0x01000000
> -
> -#define F_SDH30_CMD_DAT_DELAY 0x200
> -
> -#define F_SDH30_MIN_CLOCK 400000
> +#include "sdhci_f_sdh30.h"
>
> struct f_sdhost_priv {
> struct clk *clk_iface;
> diff --git a/drivers/mmc/host/sdhci_f_sdh30.h b/drivers/mmc/host/sdhci_f_sdh30.h
> new file mode 100644
> index 0000000..fc1ad28
> --- /dev/null
> +++ b/drivers/mmc/host/sdhci_f_sdh30.h
> @@ -0,0 +1,32 @@
> +/* SPDX-License-Identifier: GPL-2.0 */
> +/*
> + * Copyright (C) 2013 - 2015 Fujitsu Semiconductor, Ltd
> + * Vincent Yang <vincent.yang@xxxxxxxxxxxxxx>
> + * Copyright (C) 2015 Linaro Ltd Andy Green <andy.green@xxxxxxxxxx>
> + * Copyright (C) 2019 Socionext Inc.
> + *
> + */
> +
> +/* F_SDH30 extended Controller registers */
> +#define F_SDH30_AHB_CONFIG 0x100
> +#define F_SDH30_AHB_BIGED BIT(6)
> +#define F_SDH30_BUSLOCK_DMA BIT(5)
> +#define F_SDH30_BUSLOCK_EN BIT(4)
> +#define F_SDH30_SIN BIT(3)
> +#define F_SDH30_AHB_INCR_16 BIT(2)
> +#define F_SDH30_AHB_INCR_8 BIT(1)
> +#define F_SDH30_AHB_INCR_4 BIT(0)
> +
> +#define F_SDH30_TUNING_SETTING 0x108
> +#define F_SDH30_CMD_CHK_DIS BIT(16)
> +
> +#define F_SDH30_IO_CONTROL2 0x114
> +#define F_SDH30_CRES_O_DN BIT(19)
> +#define F_SDH30_MSEL_O_1_8 BIT(18)
> +
> +#define F_SDH30_ESD_CONTROL 0x124
> +#define F_SDH30_EMMC_RST BIT(1)
> +#define F_SDH30_CMD_DAT_DELAY BIT(9)
> +#define F_SDH30_EMMC_HS200 BIT(24)
> +
> +#define F_SDH30_MIN_CLOCK 400000
> --
> 1.9.1
>
>

Next message: Maxime Ripard: "Re: [PATCH v10 09/11] drm/sun4i: sun6i_mipi_dsi: Add VCC-DSI regulator support"
Previous message: Ulf Hansson: "Re: [PATCH] mmc: sdhci-pci: remove redundant check of slots == 0"
Next in thread: Adrian Hunter: "Re: [PATCH v2 2/2] mmc: sdhci-milbeaut: add Milbeaut SD controller driver"
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