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

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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>
---
 drivers/mmc/host/Kconfig          |  11 ++
 drivers/mmc/host/Makefile         |   1 +
 drivers/mmc/host/sdhci-milbeaut.c | 393 ++++++++++++++++++++++++++++++++++++++
 drivers/mmc/host/sdhci_f_sdh30.c  |  26 +--
 drivers/mmc/host/sdhci_f_sdh30.h  |  32 ++++
 5 files changed, 438 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..0bdb168
--- /dev/null
+++ b/drivers/mmc/host/sdhci-milbeaut.c
@@ -0,0 +1,393 @@
+// 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;
+	struct gpio_desc *power_gpio;
+};
+
+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_power_off(struct sdhci_host *host)
+{
+	struct f_sdhost_priv *priv = sdhci_priv(host);
+
+	gpiod_set_value(priv->power_gpio, 0);
+	udelay(1000);
+}
+
+static void sdhci_milbeaut_power_on(struct sdhci_host *host)
+{
+	struct f_sdhost_priv *priv = sdhci_priv(host);
+
+	gpiod_set_value(priv->power_gpio, 1);
+}
+
+static void sdhci_milbeaut_set_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(host);
+			break;
+		case MMC_POWER_OFF:
+			sdhci_milbeaut_power_off(host);
+			break;
+		}
+
+	sdhci_set_power(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);
+
+	if (!IS_ERR(priv->power_gpio)) {
+		sdhci_milbeaut_power_off(host);
+		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 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->power_gpio = devm_gpiod_get_optional(dev,
+			 "sni,mmc-power", GPIOD_OUT_LOW);
+
+	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





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