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Subject[PATCH v3 2/2] mmc: sdhci-milbeaut: add Milbeaut SD controller driver
Date
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@socionext.com>
Acked-by: Adrian Hunter <adrian.hunter@intel.com>
---
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@tw.fujitsu.com>
+ * Copyright (C) 2015 Linaro Ltd Andy Green <andy.green@linaro.org>
+ * Copyright (C) 2019 Socionext Inc.
+ * Takao Orito <orito.takao@socionext.com>
+ */
+
+#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@socionext.com>");
+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@tw.fujitsu.com>
+ * Copyright (C) 2015 Linaro Ltd Andy Green <andy.green@linaro.org>
+ * 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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