Re: [Milbeaut PATCH v0.4 2/2] mmc: sdhci_f_sdh30: Add support for Milbeaut M10V host controller

From: Ulf Hansson
Date: Thu Apr 11 2019 - 06:23:22 EST

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On Tue, 26 Mar 2019 at 05:56, Takao Orito <orito.takao@xxxxxxxxxxxxx> wrote:
>
> SD Host controller on Milbeaut is consist 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.
>
> This new driver uses GPIO descriptor from platform data to switch
> the power.
>
> Signed-off-by: Takao Orito <orito.takao@xxxxxxxxxxxxx>

Looks like you should add a new variant driver instead of extending
sdhci_f_sdh30.c.

If there are some registers bits or some other minor things that you
want to share among these variants, you can always do that via a
header file.

Kind regards
Uffe

> ---
> drivers/mmc/host/sdhci_f_sdh30.c | 324 +++++++++++++++++++++++++++++++++++----
> 1 file changed, 296 insertions(+), 28 deletions(-)
>
> diff --git a/drivers/mmc/host/sdhci_f_sdh30.c b/drivers/mmc/host/sdhci_f_sdh30.c
> index 485f759..994bafd 100644
> --- a/drivers/mmc/host/sdhci_f_sdh30.c
> +++ b/drivers/mmc/host/sdhci_f_sdh30.c
> @@ -11,12 +11,15 @@
> */
>
> #include <linux/acpi.h>
> -#include <linux/err.h>
> +#include <linux/clk.h>
> #include <linux/delay.h>
> +#include <linux/err.h>
> +#include <linux/bits.h>
> +#include <linux/gpio/consumer.h>
> #include <linux/module.h>
> #include <linux/of.h>
> +#include <linux/of_device.h>
> #include <linux/property.h>
> -#include <linux/clk.h>
>
> #include "sdhci-pltfm.h"
>
> @@ -43,14 +46,55 @@
>
> #define F_SDH30_CMD_DAT_DELAY 0x200
>
> +/* 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
> +
> #define F_SDH30_MIN_CLOCK 400000
>
> +struct f_sdh30_config {
> + void (*reset)(struct sdhci_host *host, u8 mask);
> + void (*init)(struct sdhci_host *host);
> + void (*quirk_init)(struct sdhci_host *host);
> + void (*prepare_power)(struct sdhci_host *host, unsigned char mode,
> + unsigned short vdd);
> +};
> +
> struct f_sdhost_priv {
> struct clk *clk_iface;
> struct clk *clk;
> u32 vendor_hs200;
> struct device *dev;
> bool enable_cmd_dat_delay;
> + struct gpio_desc *power_gpio;
> + struct f_sdh30_config *config;
> };
>
> static void sdhci_f_sdh30_soft_voltage_switch(struct sdhci_host *host)
> @@ -86,7 +130,46 @@ static unsigned int sdhci_f_sdh30_get_min_clock(struct sdhci_host *host)
> return F_SDH30_MIN_CLOCK;
> }
>
> -static void sdhci_f_sdh30_reset(struct sdhci_host *host, u8 mask)
> +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_mb86s70_reset(struct sdhci_host *host, u8 mask)
> {
> struct f_sdhost_priv *priv = sdhci_priv(host);
> u32 ctl;
> @@ -103,6 +186,51 @@ static void sdhci_f_sdh30_reset(struct sdhci_host *host, u8 mask)
> }
> }
>
> +static void sdhci_f_sdh30_reset(struct sdhci_host *host, u8 mask)
> +{
> + struct f_sdhost_priv *priv = sdhci_priv(host);
> +
> + priv->config->reset(host, mask);
> +}
> +
> +static void sdhci_milbeaut_power_off(struct f_sdhost_priv *priv)
> +{
> + gpiod_set_value(priv->power_gpio, 0);
> + udelay(1000);
> +}
> +
> +static void sdhci_milbeaut_power_on(struct f_sdhost_priv *priv)
> +{
> + gpiod_set_value(priv->power_gpio, 1);
> +}
> +
> +static void sdhci_milbeaut_prepare_power(struct sdhci_host *host,
> + unsigned char mode, unsigned short vdd)
> +{
> + struct f_sdhost_priv *priv = sdhci_priv(host);
> +
> + if (!IS_ERR(priv->power_gpio))
> + switch (mode) {
> + case MMC_POWER_UP:
> + sdhci_milbeaut_power_on(priv);
> + break;
> + case MMC_POWER_OFF:
> + sdhci_milbeaut_power_off(priv);
> + return;
> + }
> +}
> +
> +static void sdhci_f_sdh30_set_power(struct sdhci_host *host,
> + unsigned char mode, unsigned short vdd)
> +{
> + struct f_sdhost_priv *priv = sdhci_priv(host);
> +
> + if (priv->config->prepare_power)
> + priv->config->prepare_power(host, mode, vdd);
> +
> + sdhci_set_power(host, mode, vdd);
> +}
> +
> static const struct sdhci_ops sdhci_f_sdh30_ops = {
> .voltage_switch = sdhci_f_sdh30_soft_voltage_switch,
> .get_min_clock = sdhci_f_sdh30_get_min_clock,
> @@ -110,6 +238,156 @@ static void sdhci_f_sdh30_reset(struct sdhci_host *host, u8 mask)
> .set_clock = sdhci_set_clock,
> .set_bus_width = sdhci_set_bus_width,
> .set_uhs_signaling = sdhci_set_uhs_signaling,
> + .set_power = sdhci_f_sdh30_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 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);
> +
> + priv->power_gpio = devm_gpiod_get_optional(priv->dev,
> + "sni,mmc-power", GPIOD_OUT_LOW);
> + if (!IS_ERR(priv->power_gpio)) {
> + sdhci_milbeaut_power_off(priv);
> + msleep(20); /* need for card power off duration */
> + }
> +
> + sdhci_milbeaut_bridge_init(host, rate);
> + sdhci_milbeaut_bridge_reset(host, 0);
> +
> + sdhci_milbeaut_vendor_init(host);
> +}
> +
> +static void sdhci_mb86s70_init(struct sdhci_host *host)
> +{
> + struct f_sdhost_priv *priv = sdhci_priv(host);
> + u32 ctrl, reg;
> +
> + /* init vendor specific regs */
> + ctrl = sdhci_readw(host, F_SDH30_AHB_CONFIG);
> + ctrl |= F_SDH30_SIN | F_SDH30_AHB_INCR_16 | F_SDH30_AHB_INCR_8 |
> + F_SDH30_AHB_INCR_4;
> + ctrl &= ~(F_SDH30_AHB_BIGED | F_SDH30_BUSLOCK_EN);
> + sdhci_writew(host, ctrl, F_SDH30_AHB_CONFIG);
> +
> + reg = sdhci_readl(host, F_SDH30_ESD_CONTROL);
> + sdhci_writel(host, reg & ~F_SDH30_EMMC_RST, F_SDH30_ESD_CONTROL);
> + msleep(20);
> + sdhci_writel(host, reg | F_SDH30_EMMC_RST, F_SDH30_ESD_CONTROL);
> +
> + reg = sdhci_readl(host, SDHCI_CAPABILITIES);
> + if (reg & SDHCI_CAN_DO_8BIT)
> + priv->vendor_hs200 = F_SDH30_EMMC_HS200;
> +}
> +
> +static void sdhci_milbeaut_quirk_init(struct sdhci_host *host)
> +{
> + 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;
> +}
> +
> +static void sdhci_mb86s70_quirk_init(struct sdhci_host *host)
> +{
> + host->quirks = SDHCI_QUIRK_NO_ENDATTR_IN_NOPDESC |
> + SDHCI_QUIRK_INVERTED_WRITE_PROTECT;
> + host->quirks2 = SDHCI_QUIRK2_SUPPORT_SINGLE |
> + SDHCI_QUIRK2_TUNING_WORK_AROUND;
> +}
> +
> +struct f_sdh30_config mb86s70_config = {
> + .reset = sdhci_mb86s70_reset,
> + .quirk_init = sdhci_mb86s70_quirk_init,
> + .init = sdhci_mb86s70_init,
> +};
> +
> +struct f_sdh30_config milbeaut_config = {
> + .reset = sdhci_milbeaut_reset,
> + .prepare_power = sdhci_milbeaut_prepare_power,
> + .quirk_init = sdhci_milbeaut_quirk_init,
> + .init = sdhci_milbeaut_init,
> };
>
> static int sdhci_f_sdh30_probe(struct platform_device *pdev)
> @@ -117,9 +395,8 @@ static int sdhci_f_sdh30_probe(struct platform_device *pdev)
> struct sdhci_host *host;
> struct device *dev = &pdev->dev;
> struct resource *res;
> - int irq, ctrl = 0, ret = 0;
> + int irq, ret = 0;
> struct f_sdhost_priv *priv;
> - u32 reg = 0;
>
> irq = platform_get_irq(pdev, 0);
> if (irq < 0) {
> @@ -133,14 +410,12 @@ static int sdhci_f_sdh30_probe(struct platform_device *pdev)
>
> priv = sdhci_priv(host);
> priv->dev = dev;
> + priv->config = (struct f_sdh30_config *)of_device_get_match_data(dev);
> + if (!priv->config)
> + /* this must be matched by ACPI, fall down to mb86s70 compat */
> + priv->config = &mb86s70_config;
>
> - host->quirks = SDHCI_QUIRK_NO_ENDATTR_IN_NOPDESC |
> - SDHCI_QUIRK_INVERTED_WRITE_PROTECT;
> - host->quirks2 = SDHCI_QUIRK2_SUPPORT_SINGLE |
> - SDHCI_QUIRK2_TUNING_WORK_AROUND;
> -
> - priv->enable_cmd_dat_delay = device_property_read_bool(dev,
> - "fujitsu,cmd-dat-delay-select");
> + priv->config->quirk_init(host);
>
> ret = mmc_of_parse(host->mmc);
> if (ret)
> @@ -183,21 +458,7 @@ static int sdhci_f_sdh30_probe(struct platform_device *pdev)
> goto err_clk;
> }
>
> - /* init vendor specific regs */
> - ctrl = sdhci_readw(host, F_SDH30_AHB_CONFIG);
> - ctrl |= F_SDH30_SIN | F_SDH30_AHB_INCR_16 | F_SDH30_AHB_INCR_8 |
> - F_SDH30_AHB_INCR_4;
> - ctrl &= ~(F_SDH30_AHB_BIGED | F_SDH30_BUSLOCK_EN);
> - sdhci_writew(host, ctrl, F_SDH30_AHB_CONFIG);
> -
> - reg = sdhci_readl(host, F_SDH30_ESD_CONTROL);
> - sdhci_writel(host, reg & ~F_SDH30_EMMC_RST, F_SDH30_ESD_CONTROL);
> - msleep(20);
> - sdhci_writel(host, reg | F_SDH30_EMMC_RST, F_SDH30_ESD_CONTROL);
> -
> - reg = sdhci_readl(host, SDHCI_CAPABILITIES);
> - if (reg & SDHCI_CAN_DO_8BIT)
> - priv->vendor_hs200 = F_SDH30_EMMC_HS200;
> + priv->config->init(host);
>
> ret = sdhci_add_host(host);
> if (ret)
> @@ -233,7 +494,14 @@ static int sdhci_f_sdh30_remove(struct platform_device *pdev)
>
> #ifdef CONFIG_OF
> static const struct of_device_id f_sdh30_dt_ids[] = {
> - { .compatible = "fujitsu,mb86s70-sdhci-3.0" },
> + {
> + .compatible = "fujitsu,mb86s70-sdhci-3.0",
> + .data = &mb86s70_config,
> + },
> + {
> + .compatible = "socionext,milbeaut-m10v-sdhci-3.0",
> + .data = &milbeaut_config,
> + },
> { /* sentinel */ }
> };
> MODULE_DEVICE_TABLE(of, f_sdh30_dt_ids);
> --
> 1.9.1
>
>

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