[PATCH v2 0/4] mmc: sdhci: adding support for a new Fujitsu sdhci IP

[PATCH v2 0/4] mmc: sdhci: adding support for a new Fujitsu sdhci IP

[Vincent Yang]

Hello,

  Fujitsu have an sdhci IP which is implemented in a SoC we're 
adding to mainline, the most recent series for that was sent 
here:
http://lists.infradead.org/pipermail/linux-arm-kernel/2014-December/310539.html

  We welcome any comment and advice about how to make any
improvements or better align them with upstream.

Changes since v1:
* Thanks to Uffe, removed ARCH_MB86S7X dependency and separated
mmc patches to this patchset.
* Node name changed from "fujitsu,mb86s70-sdh30" to
"fujitsu,mb86s70-sdhci-3.0".

Thanks.

Vincent Yang (4):
  mmc: sdhci: add a voltage switch callback function
  mmc: sdhci: add a quirk for tuning work around
  mmc: sdhci: add a quirk for single block transactions
  mmc: sdhci: host: add new f_sdh30

 .../devicetree/bindings/mmc/sdhci-fujitsu.txt      |  35 +++
 drivers/mmc/host/Kconfig                           |   8 +
 drivers/mmc/host/Makefile                          |   1 +
 drivers/mmc/host/sdhci.c                           |  14 +-
 drivers/mmc/host/sdhci.h                           |   1 +
 drivers/mmc/host/sdhci_f_sdh30.c                   | 319 +++++++++++++++++++++
 include/linux/mmc/sdhci.h                          |   4 +
 7 files changed, 379 insertions(+), 3 deletions(-)
 create mode 100644 Documentation/devicetree/bindings/mmc/sdhci-fujitsu.txt
 create mode 100644 drivers/mmc/host/sdhci_f_sdh30.c

-- 
1.9.0

[PATCH v2 1/4] mmc: sdhci: add a voltage switch callback function

[Vincent Yang]

This patch adds a callback function to do
controller-specific actions when switching voltages.
It is a preparation and will be used by Fujitsu
SDHCI controller f_sdh30 driver.

Signed-off-by: Vincent Yang <Vincent.Yang@tw.fujitsu.com>
---
 drivers/mmc/host/sdhci.c | 4 ++++
 drivers/mmc/host/sdhci.h | 1 +
 2 files changed, 5 insertions(+)

diff --git a/drivers/mmc/host/sdhci.c b/drivers/mmc/host/sdhci.c
index cbb245b..cd1f311 100644
--- a/drivers/mmc/host/sdhci.c
+++ b/drivers/mmc/host/sdhci.c
@@ -1827,6 +1827,10 @@ static int sdhci_do_start_signal_voltage_switch(struct sdhci_host *host,
 		ctrl |= SDHCI_CTRL_VDD_180;
 		sdhci_writew(host, ctrl, SDHCI_HOST_CONTROL2);
 
+		/* Some controller need to do more when switching */
+		if (host->ops->voltage_switch)
+			host->ops->voltage_switch(host);
+
 		/* 1.8V regulator output should be stable within 5 ms */
 		ctrl = sdhci_readw(host, SDHCI_HOST_CONTROL2);
 		if (ctrl & SDHCI_CTRL_VDD_180)
diff --git a/drivers/mmc/host/sdhci.h b/drivers/mmc/host/sdhci.h
index 41a2c34..0315e18 100644
--- a/drivers/mmc/host/sdhci.h
+++ b/drivers/mmc/host/sdhci.h
@@ -339,6 +339,7 @@ struct sdhci_ops {
 	void    (*adma_workaround)(struct sdhci_host *host, u32 intmask);
 	void	(*platform_init)(struct sdhci_host *host);
 	void    (*card_event)(struct sdhci_host *host);
+	void	(*voltage_switch)(struct sdhci_host *host);
 };
 
 #ifdef CONFIG_MMC_SDHCI_IO_ACCESSORS
-- 
1.9.0

[PATCH v2 2/4] mmc: sdhci: add a quirk for tuning work around

[Vincent Yang]

This patch defines a quirk for tuning work
around for some sdhci host controller. It sets
both SDHCI_CTRL_EXEC_TUNING and SDHCI_CTRL_TUNED_CLK
for tuning.
It is a preparation and will be used by Fujitsu
SDHCI controller f_sdh30 driver.

Signed-off-by: Vincent Yang <Vincent.Yang@tw.fujitsu.com>
---
 drivers/mmc/host/sdhci.c  | 2 ++
 include/linux/mmc/sdhci.h | 2 ++
 2 files changed, 4 insertions(+)

diff --git a/drivers/mmc/host/sdhci.c b/drivers/mmc/host/sdhci.c
index cd1f311..b319c10 100644
--- a/drivers/mmc/host/sdhci.c
+++ b/drivers/mmc/host/sdhci.c
@@ -1929,6 +1929,8 @@ static int sdhci_execute_tuning(struct mmc_host *mmc, u32 opcode)
 
 	ctrl = sdhci_readw(host, SDHCI_HOST_CONTROL2);
 	ctrl |= SDHCI_CTRL_EXEC_TUNING;
+	if (host->quirks2 & SDHCI_QUIRK2_TUNING_WORK_AROUND)
+		ctrl |= SDHCI_CTRL_TUNED_CLK;
 	sdhci_writew(host, ctrl, SDHCI_HOST_CONTROL2);
 
 	/*
diff --git a/include/linux/mmc/sdhci.h b/include/linux/mmc/sdhci.h
index 375af80..dd2ba4b 100644
--- a/include/linux/mmc/sdhci.h
+++ b/include/linux/mmc/sdhci.h
@@ -106,6 +106,8 @@ struct sdhci_host {
 #define SDHCI_QUIRK2_CLEAR_TRANSFERMODE_REG_BEFORE_CMD	(1<<10)
 /* Capability register bit-63 indicates HS400 support */
 #define SDHCI_QUIRK2_CAPS_BIT63_FOR_HS400		(1<<11)
+/* forced tuned clock */
+#define SDHCI_QUIRK2_TUNING_WORK_AROUND			(1<<12)
 
 	int irq;		/* Device IRQ */
 	void __iomem *ioaddr;	/* Mapped address */
-- 
1.9.0

[PATCH v2 3/4] mmc: sdhci: add a quirk for single block transactions

[Vincent Yang]

This patch defines a quirk to disable the block count
for single block transactions.
It is a preparation and will be used by Fujitsu
SDHCI controller f_sdh30 driver.

Signed-off-by: Vincent Yang <Vincent.Yang@tw.fujitsu.com>
---
 drivers/mmc/host/sdhci.c  | 8 +++++---
 include/linux/mmc/sdhci.h | 2 ++
 2 files changed, 7 insertions(+), 3 deletions(-)

diff --git a/drivers/mmc/host/sdhci.c b/drivers/mmc/host/sdhci.c
index b319c10..5581b16 100644
--- a/drivers/mmc/host/sdhci.c
+++ b/drivers/mmc/host/sdhci.c
@@ -911,7 +911,7 @@ static void sdhci_prepare_data(struct sdhci_host *host, struct mmc_command *cmd)
 static void sdhci_set_transfer_mode(struct sdhci_host *host,
 	struct mmc_command *cmd)
 {
-	u16 mode;
+	u16 mode = 0;
 	struct mmc_data *data = cmd->data;
 
 	if (data == NULL) {
@@ -929,9 +929,11 @@ static void sdhci_set_transfer_mode(struct sdhci_host *host,
 
 	WARN_ON(!host->data);
 
-	mode = SDHCI_TRNS_BLK_CNT_EN;
+	if (!(host->quirks2 & SDHCI_QUIRK2_SUPPORT_SINGLE))
+		mode = SDHCI_TRNS_BLK_CNT_EN;
+
 	if (mmc_op_multi(cmd->opcode) || data->blocks > 1) {
-		mode |= SDHCI_TRNS_MULTI;
+		mode = SDHCI_TRNS_BLK_CNT_EN | SDHCI_TRNS_MULTI;
 		/*
 		 * If we are sending CMD23, CMD12 never gets sent
 		 * on successful completion (so no Auto-CMD12).
diff --git a/include/linux/mmc/sdhci.h b/include/linux/mmc/sdhci.h
index dd2ba4b..2e048f4 100644
--- a/include/linux/mmc/sdhci.h
+++ b/include/linux/mmc/sdhci.h
@@ -108,6 +108,8 @@ struct sdhci_host {
 #define SDHCI_QUIRK2_CAPS_BIT63_FOR_HS400		(1<<11)
 /* forced tuned clock */
 #define SDHCI_QUIRK2_TUNING_WORK_AROUND			(1<<12)
+/* disable the block count for single block transactions */
+#define SDHCI_QUIRK2_SUPPORT_SINGLE			(1<<13)
 
 	int irq;		/* Device IRQ */
 	void __iomem *ioaddr;	/* Mapped address */
-- 
1.9.0

[PATCH v2 4/4] mmc: sdhci: host: add new f_sdh30

[Vincent Yang]

This patch adds new host controller driver for
Fujitsu SDHCI controller f_sdh30.

Signed-off-by: Andy Green <andy.green@linaro.org>
Signed-off-by: Vincent Yang <Vincent.Yang@tw.fujitsu.com>
Signed-off-by: Tetsuya Takinishi <t.takinishi@jp.fujitsu.com>
---
 .../devicetree/bindings/mmc/sdhci-fujitsu.txt      |  35 +++
 drivers/mmc/host/Kconfig                           |   8 +
 drivers/mmc/host/Makefile                          |   1 +
 drivers/mmc/host/sdhci_f_sdh30.c                   | 319 +++++++++++++++++++++
 4 files changed, 363 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/mmc/sdhci-fujitsu.txt
 create mode 100644 drivers/mmc/host/sdhci_f_sdh30.c

diff --git a/Documentation/devicetree/bindings/mmc/sdhci-fujitsu.txt b/Documentation/devicetree/bindings/mmc/sdhci-fujitsu.txt
new file mode 100644
index 0000000..d1a50f1
--- /dev/null
+++ b/Documentation/devicetree/bindings/mmc/sdhci-fujitsu.txt
@@ -0,0 +1,35 @@
+* Fujitsu SDHCI controller
+
+This file documents differences between the core properties in mmc.txt
+and the properties used by the sdhci_f_sdh30 driver.
+
+Required properties:
+- compatible: "fujitsu,mb86s70-sdhci-3.0"
+- voltage-ranges : This is a list of pairs. In each pair, two cells
+  are required. First cell specifies minimum slot voltage (mV), second
+  cell specifies maximum slot voltage (mV). In case of supported voltage
+  range is discontinuous, several ranges could be specified as a list.
+
+Optional properties:
+- vqmmc-supply: phandle to the regulator device tree node, mentioned
+  as the VCCQ/VDD_IO supply in the eMMC/SD specs.
+- clocks: Must contain an entry for each entry in clock-names. It is a
+  list of phandles and clock-specifier pairs.
+  See ../clocks/clock-bindings.txt for details.
+- clock-names: Should contain the following two entries:
+	"iface" - clock used for sdhci interface
+	"core"  - core clock for sdhci controller
+
+Example:
+
+	sdhci1: mmc@36600000 {
+		compatible = "fujitsu,mb86s70-sdhci-3.0";
+		reg = <0 0x36600000 0x1000>;
+		interrupts = <0 172 0x4>,
+			     <0 173 0x4>;
+		voltage-ranges = <1800 1800>, <3300 3300>;
+		bus-width = <4>;
+		vqmmc-supply = <&vccq_sdhci1>;
+		clocks = <&clock 2 2 0>, <&clock 2 3 0>;
+		clock-names = "iface", "core";
+	};
diff --git a/drivers/mmc/host/Kconfig b/drivers/mmc/host/Kconfig
index 2d6fbdd..288dcc3 100644
--- a/drivers/mmc/host/Kconfig
+++ b/drivers/mmc/host/Kconfig
@@ -290,6 +290,14 @@ config MMC_SDHCI_BCM2835
 	  This selects the BCM2835 SD/MMC controller. If you have a BCM2835
 	  platform with SD or MMC devices, say Y or M here.
 
+config MMC_SDHCI_F_SDH30
+	tristate "SDHCI support for Fujitsu Semiconductor F_SDH30"
+	depends on MMC_SDHCI_PLTFM
+	depends on OF
+	help
+	  This selects the Secure Digital Host Controller Interface (SDHCI)
+	  Needed by some Fujitsu 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_MOXART
diff --git a/drivers/mmc/host/Makefile b/drivers/mmc/host/Makefile
index f7b0a77..6a7cfe0 100644
--- a/drivers/mmc/host/Makefile
+++ b/drivers/mmc/host/Makefile
@@ -16,6 +16,7 @@ obj-$(CONFIG_MMC_SDHCI_PXAV3)	+= sdhci-pxav3.o
 obj-$(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_SPEAR)	+= sdhci-spear.o
 obj-$(CONFIG_MMC_WBSD)		+= wbsd.o
 obj-$(CONFIG_MMC_AU1X)		+= au1xmmc.o
diff --git a/drivers/mmc/host/sdhci_f_sdh30.c b/drivers/mmc/host/sdhci_f_sdh30.c
new file mode 100644
index 0000000..76df115
--- /dev/null
+++ b/drivers/mmc/host/sdhci_f_sdh30.c
@@ -0,0 +1,319 @@
+/*
+ * linux/drivers/mmc/host/sdhci_f_sdh30.c
+ *
+ * Copyright (C) 2013 - 2014 Fujitsu Semiconductor, Ltd
+ *              Vincent Yang <vincent.yang@tw.fujitsu.com>
+ * Copyright (C) 2014 Linaro Ltd  Andy Green <andy.green@linaro.org>
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, version 2 of the License.
+ */
+
+#include <linux/err.h>
+#include <linux/delay.h>
+#include <linux/module.h>
+#include <linux/mmc/sd.h>
+#include <linux/mmc/host.h>
+#include <linux/mmc/card.h>
+#include <linux/gpio.h>
+#include <linux/of_gpio.h>
+#include <linux/of_address.h>
+#include <linux/platform_device.h>
+#include <linux/pm.h>
+#include <linux/pm_runtime.h>
+#include <linux/suspend.h>
+
+#include "sdhci.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
+
+struct f_sdhost_priv {
+	struct clk *clk_iface;
+	struct clk *clk;
+	u32 vendor_hs200;
+	struct device *dev;
+};
+
+void sdhci_f_sdh30_soft_voltage_switch(struct sdhci_host *host)
+{
+	struct f_sdhost_priv *priv = sdhci_priv(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);
+
+	if (priv->vendor_hs200) {
+		dev_info(priv->dev, "%s: setting hs200\n", __func__);
+		ctrl = sdhci_readl(host, F_SDH30_ESD_CONTROL);
+		ctrl |= priv->vendor_hs200;
+		sdhci_writel(host, ctrl, F_SDH30_ESD_CONTROL);
+	}
+
+	ctrl = sdhci_readl(host, F_SDH30_TUNING_SETTING);
+	ctrl |= F_SDH30_CMD_CHK_DIS;
+	sdhci_writel(host, ctrl, F_SDH30_TUNING_SETTING);
+}
+
+unsigned int sdhci_f_sdh30_get_min_clock(struct sdhci_host *host)
+{
+	return F_SDH30_MIN_CLOCK;
+}
+
+void sdhci_f_sdh30_reset(struct sdhci_host *host, u8 mask)
+{
+	if (sdhci_readw(host, SDHCI_CLOCK_CONTROL) == 0)
+		sdhci_writew(host, 0xBC01, SDHCI_CLOCK_CONTROL);
+
+	sdhci_reset(host, mask);
+}
+
+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,
+	.reset = sdhci_f_sdh30_reset,
+	.set_clock = sdhci_set_clock,
+	.set_bus_width = sdhci_set_bus_width,
+	.set_uhs_signaling = sdhci_set_uhs_signaling,
+};
+
+static int sdhci_f_sdh30_probe(struct platform_device *pdev)
+{
+	struct sdhci_host *host;
+	struct device *dev = &pdev->dev;
+	int irq, ctrl = 0, ret = 0;
+	struct f_sdhost_priv *priv;
+	u32 reg = 0;
+
+	irq = platform_get_irq(pdev, 0);
+	if (irq < 0) {
+		dev_err(dev, "%s: no irq specified\n", __func__);
+		ret = irq;
+		goto err;
+	}
+
+	host = sdhci_alloc_host(dev, sizeof(struct sdhci_host) +
+						sizeof(struct f_sdhost_priv));
+	if (IS_ERR(host)) {
+		dev_err(dev, "%s: host allocate error\n", __func__);
+		ret = -ENOMEM;
+		goto err;
+	}
+	priv = sdhci_priv(host);
+	priv->dev = dev;
+
+	host->quirks = SDHCI_QUIRK_NO_ENDATTR_IN_NOPDESC |
+		       SDHCI_QUIRK_INVERTED_WRITE_PROTECT;
+	host->quirks2 = SDHCI_QUIRK2_SUPPORT_SINGLE |
+			SDHCI_QUIRK2_TUNING_WORK_AROUND;
+
+	ret = mmc_of_parse(host->mmc);
+	if (ret)
+		goto err_of_parse;
+
+	ret = mmc_of_parse_voltage(pdev->dev.of_node, &host->ocr_mask);
+	if (ret)
+		goto err_of_parse;
+
+	platform_set_drvdata(pdev, host);
+
+	sdhci_get_of_property(pdev);
+	host->hw_name = "f_sdh30";
+	host->ops = &sdhci_f_sdh30_ops;
+	host->irq = irq;
+
+	host->ioaddr = of_iomap(pdev->dev.of_node, 0);
+	if (!host->ioaddr) {
+		dev_err(dev, "%s: failed to remap registers\n", __func__);
+		ret = -ENXIO;
+		goto err_remap;
+	}
+
+	priv->clk_iface = clk_get(&pdev->dev, "iface");
+	if (!IS_ERR(priv->clk_iface)) {
+		ret = clk_prepare_enable(priv->clk_iface);
+		if (ret < 0) {
+			dev_err(dev, "Failed to enable iface clock: %d\n", ret);
+			goto err_clk1;
+		}
+	}
+	priv->clk = clk_get(&pdev->dev, "core");
+	if (!IS_ERR(priv->clk)) {
+		ret = clk_prepare_enable(priv->clk);
+		if (ret < 0) {
+			dev_err(dev, "Failed to enable core clock: %d\n", ret);
+			goto err_clk2;
+		}
+	}
+
+#ifdef CONFIG_PM_RUNTIME
+	pm_runtime_set_active(&pdev->dev);
+	pm_runtime_enable(&pdev->dev);
+	ret = pm_runtime_get_sync(&pdev->dev);
+	if (ret < 0)
+		dev_err(dev, "Failed to pm_runtime_get_sync: %d\n", ret);
+#endif
+
+	ret = sdhci_add_host(host);
+	if (ret) {
+		dev_err(dev, "%s: host add error\n", __func__);
+		goto err_add_host;
+	}
+
+	/* 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;
+	else
+		priv->vendor_hs200 = 0;
+
+	return 0;
+
+err_add_host:
+	clk_put(priv->clk);
+err_clk2:
+	clk_put(priv->clk_iface);
+err_clk1:
+	iounmap(host->ioaddr);
+err_remap:
+err_of_parse:
+	sdhci_free_host(host);
+err:
+	return ret;
+}
+
+static int sdhci_f_sdh30_remove(struct platform_device *pdev)
+{
+	struct sdhci_host *host = platform_get_drvdata(pdev);
+	struct f_sdhost_priv *priv = sdhci_priv(host);
+	struct resource *iomem = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+
+	sdhci_remove_host(host, readl(host->ioaddr + SDHCI_INT_STATUS) ==
+			  0xffffffff);
+	iounmap(host->ioaddr);
+	release_mem_region(iomem->start, resource_size(iomem));
+
+	clk_disable_unprepare(priv->clk_iface);
+	clk_disable_unprepare(priv->clk);
+
+	clk_put(priv->clk);
+	clk_put(priv->clk_iface);
+
+	sdhci_free_host(host);
+	platform_set_drvdata(pdev, NULL);
+
+	return 0;
+}
+
+#ifdef CONFIG_PM_SLEEP
+static int sdhci_f_sdh30_suspend(struct device *dev)
+{
+	struct sdhci_host *host = dev_get_drvdata(dev);
+
+	return sdhci_suspend_host(host);
+}
+
+static int sdhci_f_sdh30_resume(struct device *dev)
+{
+	struct sdhci_host *host = dev_get_drvdata(dev);
+
+	return sdhci_resume_host(host);
+}
+#endif
+
+#ifdef CONFIG_PM_RUNTIME
+static int sdhci_f_sdh30_runtime_suspend(struct device *dev)
+{
+	struct sdhci_host *host = dev_get_drvdata(dev);
+
+	return sdhci_runtime_suspend_host(host);
+}
+
+static int sdhci_f_sdh30_runtime_resume(struct device *dev)
+{
+	struct sdhci_host *host = dev_get_drvdata(dev);
+
+	return sdhci_runtime_resume_host(host);
+}
+#endif
+
+#ifdef CONFIG_PM
+static const struct dev_pm_ops sdhci_f_sdh30_pmops = {
+	SET_SYSTEM_SLEEP_PM_OPS(sdhci_f_sdh30_suspend, sdhci_f_sdh30_resume)
+	SET_RUNTIME_PM_OPS(sdhci_f_sdh30_runtime_suspend,
+			   sdhci_f_sdh30_runtime_resume, NULL)
+};
+
+#define SDHCI_F_SDH30_PMOPS (&sdhci_f_sdh30_pmops)
+
+#else
+#define SDHCI_F_SDH30_PMOPS NULL
+#endif
+
+static const struct of_device_id f_sdh30_dt_ids[] = {
+	{ .compatible = "fujitsu,mb86s70-sdhci-3.0" },
+	{ /* sentinel */ }
+};
+MODULE_DEVICE_TABLE(of, f_sdh30_dt_ids);
+
+static struct platform_driver sdhci_f_sdh30_driver = {
+	.driver = {
+		.name = "f_sdh30",
+		.of_match_table = f_sdh30_dt_ids,
+#ifdef CONFIG_PM_SLEEP
+		.pm	= SDHCI_F_SDH30_PMOPS,
+#endif
+	},
+	.probe	= sdhci_f_sdh30_probe,
+	.remove	= sdhci_f_sdh30_remove,
+};
+
+module_platform_driver(sdhci_f_sdh30_driver);
+
+MODULE_DESCRIPTION("F_SDH30 SD Card Controller driver");
+MODULE_LICENSE("GPL v2");
+MODULE_AUTHOR("FUJITSU SEMICONDUCTOR LTD.");
+MODULE_ALIAS("platform:f_sdh30");
-- 
1.9.0

Re: [PATCH v2 4/4] mmc: sdhci: host: add new f_sdh30

[Ulf Hansson]

On 15 December 2014 at 08:30, Vincent Yang
<vincent.yang.fujitsu@gmail.com> wrote:
> This patch adds new host controller driver for
> Fujitsu SDHCI controller f_sdh30.
>
> Signed-off-by: Andy Green <andy.green@linaro.org>
> Signed-off-by: Vincent Yang <Vincent.Yang@tw.fujitsu.com>
> Signed-off-by: Tetsuya Takinishi <t.takinishi@jp.fujitsu.com>
> ---
>  .../devicetree/bindings/mmc/sdhci-fujitsu.txt      |  35 +++
>  drivers/mmc/host/Kconfig                           |   8 +
>  drivers/mmc/host/Makefile                          |   1 +
>  drivers/mmc/host/sdhci_f_sdh30.c                   | 319 +++++++++++++++++++++
>  4 files changed, 363 insertions(+)
>  create mode 100644 Documentation/devicetree/bindings/mmc/sdhci-fujitsu.txt
>  create mode 100644 drivers/mmc/host/sdhci_f_sdh30.c
>
> diff --git a/Documentation/devicetree/bindings/mmc/sdhci-fujitsu.txt b/Documentation/devicetree/bindings/mmc/sdhci-fujitsu.txt
> new file mode 100644
> index 0000000..d1a50f1
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/mmc/sdhci-fujitsu.txt
> @@ -0,0 +1,35 @@
> +* Fujitsu SDHCI controller
> +
> +This file documents differences between the core properties in mmc.txt
> +and the properties used by the sdhci_f_sdh30 driver.
> +
> +Required properties:
> +- compatible: "fujitsu,mb86s70-sdhci-3.0"
> +- voltage-ranges : This is a list of pairs. In each pair, two cells
> +  are required. First cell specifies minimum slot voltage (mV), second
> +  cell specifies maximum slot voltage (mV). In case of supported voltage
> +  range is discontinuous, several ranges could be specified as a list.

Can't these be modelled from a regulator instead? Thus using a "vmmc-supply"?

> +
> +Optional properties:
> +- vqmmc-supply: phandle to the regulator device tree node, mentioned
> +  as the VCCQ/VDD_IO supply in the eMMC/SD specs.
> +- clocks: Must contain an entry for each entry in clock-names. It is a
> +  list of phandles and clock-specifier pairs.
> +  See ../clocks/clock-bindings.txt for details.
> +- clock-names: Should contain the following two entries:
> +       "iface" - clock used for sdhci interface
> +       "core"  - core clock for sdhci controller
> +
> +Example:
> +
> +       sdhci1: mmc@36600000 {
> +               compatible = "fujitsu,mb86s70-sdhci-3.0";
> +               reg = <0 0x36600000 0x1000>;
> +               interrupts = <0 172 0x4>,
> +                            <0 173 0x4>;
> +               voltage-ranges = <1800 1800>, <3300 3300>;
> +               bus-width = <4>;
> +               vqmmc-supply = <&vccq_sdhci1>;
> +               clocks = <&clock 2 2 0>, <&clock 2 3 0>;
> +               clock-names = "iface", "core";
> +       };
> diff --git a/drivers/mmc/host/Kconfig b/drivers/mmc/host/Kconfig
> index 2d6fbdd..288dcc3 100644
> --- a/drivers/mmc/host/Kconfig
> +++ b/drivers/mmc/host/Kconfig
> @@ -290,6 +290,14 @@ config MMC_SDHCI_BCM2835
>           This selects the BCM2835 SD/MMC controller. If you have a BCM2835
>           platform with SD or MMC devices, say Y or M here.
>
> +config MMC_SDHCI_F_SDH30
> +       tristate "SDHCI support for Fujitsu Semiconductor F_SDH30"
> +       depends on MMC_SDHCI_PLTFM
> +       depends on OF
> +       help
> +         This selects the Secure Digital Host Controller Interface (SDHCI)
> +         Needed by some Fujitsu 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_MOXART
> diff --git a/drivers/mmc/host/Makefile b/drivers/mmc/host/Makefile
> index f7b0a77..6a7cfe0 100644
> --- a/drivers/mmc/host/Makefile
> +++ b/drivers/mmc/host/Makefile
> @@ -16,6 +16,7 @@ obj-$(CONFIG_MMC_SDHCI_PXAV3) += sdhci-pxav3.o
>  obj-$(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_SPEAR)  += sdhci-spear.o
>  obj-$(CONFIG_MMC_WBSD)         += wbsd.o
>  obj-$(CONFIG_MMC_AU1X)         += au1xmmc.o
> diff --git a/drivers/mmc/host/sdhci_f_sdh30.c b/drivers/mmc/host/sdhci_f_sdh30.c
> new file mode 100644
> index 0000000..76df115
> --- /dev/null
> +++ b/drivers/mmc/host/sdhci_f_sdh30.c
> @@ -0,0 +1,319 @@
> +/*
> + * linux/drivers/mmc/host/sdhci_f_sdh30.c
> + *
> + * Copyright (C) 2013 - 2014 Fujitsu Semiconductor, Ltd
> + *              Vincent Yang <vincent.yang@tw.fujitsu.com>
> + * Copyright (C) 2014 Linaro Ltd  Andy Green <andy.green@linaro.org>
> + *
> + * This program is free software: you can redistribute it and/or modify
> + * it under the terms of the GNU General Public License as published by
> + * the Free Software Foundation, version 2 of the License.
> + */
> +
> +#include <linux/err.h>
> +#include <linux/delay.h>
> +#include <linux/module.h>
> +#include <linux/mmc/sd.h>
> +#include <linux/mmc/host.h>
> +#include <linux/mmc/card.h>
> +#include <linux/gpio.h>
> +#include <linux/of_gpio.h>
> +#include <linux/of_address.h>
> +#include <linux/platform_device.h>
> +#include <linux/pm.h>
> +#include <linux/pm_runtime.h>
> +#include <linux/suspend.h>
> +
> +#include "sdhci.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
> +
> +struct f_sdhost_priv {
> +       struct clk *clk_iface;
> +       struct clk *clk;
> +       u32 vendor_hs200;
> +       struct device *dev;
> +};
> +
> +void sdhci_f_sdh30_soft_voltage_switch(struct sdhci_host *host)
> +{
> +       struct f_sdhost_priv *priv = sdhci_priv(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);
> +
> +       if (priv->vendor_hs200) {
> +               dev_info(priv->dev, "%s: setting hs200\n", __func__);
> +               ctrl = sdhci_readl(host, F_SDH30_ESD_CONTROL);
> +               ctrl |= priv->vendor_hs200;
> +               sdhci_writel(host, ctrl, F_SDH30_ESD_CONTROL);
> +       }
> +
> +       ctrl = sdhci_readl(host, F_SDH30_TUNING_SETTING);
> +       ctrl |= F_SDH30_CMD_CHK_DIS;
> +       sdhci_writel(host, ctrl, F_SDH30_TUNING_SETTING);
> +}
> +
> +unsigned int sdhci_f_sdh30_get_min_clock(struct sdhci_host *host)
> +{
> +       return F_SDH30_MIN_CLOCK;
> +}
> +
> +void sdhci_f_sdh30_reset(struct sdhci_host *host, u8 mask)
> +{
> +       if (sdhci_readw(host, SDHCI_CLOCK_CONTROL) == 0)
> +               sdhci_writew(host, 0xBC01, SDHCI_CLOCK_CONTROL);
> +
> +       sdhci_reset(host, mask);
> +}
> +
> +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,
> +       .reset = sdhci_f_sdh30_reset,
> +       .set_clock = sdhci_set_clock,
> +       .set_bus_width = sdhci_set_bus_width,
> +       .set_uhs_signaling = sdhci_set_uhs_signaling,
> +};
> +
> +static int sdhci_f_sdh30_probe(struct platform_device *pdev)
> +{
> +       struct sdhci_host *host;
> +       struct device *dev = &pdev->dev;
> +       int irq, ctrl = 0, ret = 0;
> +       struct f_sdhost_priv *priv;
> +       u32 reg = 0;
> +
> +       irq = platform_get_irq(pdev, 0);
> +       if (irq < 0) {
> +               dev_err(dev, "%s: no irq specified\n", __func__);
> +               ret = irq;
> +               goto err;
> +       }
> +
> +       host = sdhci_alloc_host(dev, sizeof(struct sdhci_host) +
> +                                               sizeof(struct f_sdhost_priv));
> +       if (IS_ERR(host)) {
> +               dev_err(dev, "%s: host allocate error\n", __func__);

No need to print this, already done via kzalloc().

> +               ret = -ENOMEM;
> +               goto err;
> +       }
> +       priv = sdhci_priv(host);
> +       priv->dev = dev;
> +
> +       host->quirks = SDHCI_QUIRK_NO_ENDATTR_IN_NOPDESC |
> +                      SDHCI_QUIRK_INVERTED_WRITE_PROTECT;
> +       host->quirks2 = SDHCI_QUIRK2_SUPPORT_SINGLE |
> +                       SDHCI_QUIRK2_TUNING_WORK_AROUND;
> +
> +       ret = mmc_of_parse(host->mmc);
> +       if (ret)
> +               goto err_of_parse;
> +
> +       ret = mmc_of_parse_voltage(pdev->dev.of_node, &host->ocr_mask);
> +       if (ret)
> +               goto err_of_parse;
> +
> +       platform_set_drvdata(pdev, host);
> +
> +       sdhci_get_of_property(pdev);
> +       host->hw_name = "f_sdh30";
> +       host->ops = &sdhci_f_sdh30_ops;
> +       host->irq = irq;
> +
> +       host->ioaddr = of_iomap(pdev->dev.of_node, 0);

How about using devm_ioremap_resource()?

> +       if (!host->ioaddr) {
> +               dev_err(dev, "%s: failed to remap registers\n", __func__);
> +               ret = -ENXIO;
> +               goto err_remap;
> +       }
> +
> +       priv->clk_iface = clk_get(&pdev->dev, "iface");

devm_clk_get()

> +       if (!IS_ERR(priv->clk_iface)) {
> +               ret = clk_prepare_enable(priv->clk_iface);
> +               if (ret < 0) {
> +                       dev_err(dev, "Failed to enable iface clock: %d\n", ret);
> +                       goto err_clk1;
> +               }
> +       }
> +       priv->clk = clk_get(&pdev->dev, "core");

devm_clk_get()

> +       if (!IS_ERR(priv->clk)) {
> +               ret = clk_prepare_enable(priv->clk);
> +               if (ret < 0) {
> +                       dev_err(dev, "Failed to enable core clock: %d\n", ret);
> +                       goto err_clk2;
> +               }
> +       }
> +
> +#ifdef CONFIG_PM_RUNTIME

Remove this #ifdef.

> +       pm_runtime_set_active(&pdev->dev);
> +       pm_runtime_enable(&pdev->dev);
> +       ret = pm_runtime_get_sync(&pdev->dev);

Why do a pm_runtime_get_sync() without a balanced call to
pm_runtime_put()? That will keep the device forever runtime PM
resumed.

> +       if (ret < 0)
> +               dev_err(dev, "Failed to pm_runtime_get_sync: %d\n", ret);
> +#endif
> +
> +       ret = sdhci_add_host(host);
> +       if (ret) {
> +               dev_err(dev, "%s: host add error\n", __func__);
> +               goto err_add_host;
> +       }
> +
> +       /* init vendor specific regs */

All this vendor specfic stuff must be done prior you invoke
sdhci_add_host(), otherwise you will start the card initialization
before this driver is fully probed.

> +       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;
> +       else
> +               priv->vendor_hs200 = 0;
> +
> +       return 0;
> +
> +err_add_host:
> +       clk_put(priv->clk);
> +err_clk2:
> +       clk_put(priv->clk_iface);
> +err_clk1:
> +       iounmap(host->ioaddr);
> +err_remap:
> +err_of_parse:
> +       sdhci_free_host(host);
> +err:
> +       return ret;

If you use the devm_* managed functions as I pointed out above, this
error handling will be greatly simplified.

> +}
> +
> +static int sdhci_f_sdh30_remove(struct platform_device *pdev)
> +{
> +       struct sdhci_host *host = platform_get_drvdata(pdev);
> +       struct f_sdhost_priv *priv = sdhci_priv(host);
> +       struct resource *iomem = platform_get_resource(pdev, IORESOURCE_MEM, 0);
> +

Don't forget to handle runtime PM here. You probably would like this:
pm_runtime_get_sync()
pm_runtime_disable()
pm_runtime_put_noidle()

> +       sdhci_remove_host(host, readl(host->ioaddr + SDHCI_INT_STATUS) ==
> +                         0xffffffff);
> +       iounmap(host->ioaddr);
> +       release_mem_region(iomem->start, resource_size(iomem));
> +
> +       clk_disable_unprepare(priv->clk_iface);
> +       clk_disable_unprepare(priv->clk);
> +
> +       clk_put(priv->clk);
> +       clk_put(priv->clk_iface);
> +
> +       sdhci_free_host(host);
> +       platform_set_drvdata(pdev, NULL);
> +
> +       return 0;
> +}
> +
> +#ifdef CONFIG_PM_SLEEP
> +static int sdhci_f_sdh30_suspend(struct device *dev)
> +{
> +       struct sdhci_host *host = dev_get_drvdata(dev);
> +
> +       return sdhci_suspend_host(host);
> +}
> +
> +static int sdhci_f_sdh30_resume(struct device *dev)
> +{
> +       struct sdhci_host *host = dev_get_drvdata(dev);
> +
> +       return sdhci_resume_host(host);
> +}
> +#endif
> +
> +#ifdef CONFIG_PM_RUNTIME

->CONFIG_PM

> +static int sdhci_f_sdh30_runtime_suspend(struct device *dev)
> +{
> +       struct sdhci_host *host = dev_get_drvdata(dev);
> +
> +       return sdhci_runtime_suspend_host(host);
> +}
> +
> +static int sdhci_f_sdh30_runtime_resume(struct device *dev)
> +{
> +       struct sdhci_host *host = dev_get_drvdata(dev);
> +
> +       return sdhci_runtime_resume_host(host);
> +}
> +#endif
> +
> +#ifdef CONFIG_PM

Remove #ifdef

> +static const struct dev_pm_ops sdhci_f_sdh30_pmops = {
> +       SET_SYSTEM_SLEEP_PM_OPS(sdhci_f_sdh30_suspend, sdhci_f_sdh30_resume)
> +       SET_RUNTIME_PM_OPS(sdhci_f_sdh30_runtime_suspend,
> +                          sdhci_f_sdh30_runtime_resume, NULL)
> +};
> +
> +#define SDHCI_F_SDH30_PMOPS (&sdhci_f_sdh30_pmops)

Remove this and use &sdhci_f_sdh30_pmops directly below instead.

> +
> +#else
> +#define SDHCI_F_SDH30_PMOPS NULL
> +#endif
> +
> +static const struct of_device_id f_sdh30_dt_ids[] = {
> +       { .compatible = "fujitsu,mb86s70-sdhci-3.0" },
> +       { /* sentinel */ }
> +};
> +MODULE_DEVICE_TABLE(of, f_sdh30_dt_ids);
> +
> +static struct platform_driver sdhci_f_sdh30_driver = {
> +       .driver = {
> +               .name = "f_sdh30",
> +               .of_match_table = f_sdh30_dt_ids,
> +#ifdef CONFIG_PM_SLEEP
> +               .pm     = SDHCI_F_SDH30_PMOPS,
> +#endif
> +       },
> +       .probe  = sdhci_f_sdh30_probe,
> +       .remove = sdhci_f_sdh30_remove,
> +};
> +
> +module_platform_driver(sdhci_f_sdh30_driver);
> +
> +MODULE_DESCRIPTION("F_SDH30 SD Card Controller driver");
> +MODULE_LICENSE("GPL v2");
> +MODULE_AUTHOR("FUJITSU SEMICONDUCTOR LTD.");
> +MODULE_ALIAS("platform:f_sdh30");
> --
> 1.9.0
>

Kind regards
Uffe

Re: [PATCH v2 4/4] mmc: sdhci: host: add new f_sdh30

[Vincent Yang]

2014-12-30 21:53 GMT+08:00 Ulf Hansson <ulf.hansson@linaro.org>:
> On 15 December 2014 at 08:30, Vincent Yang
> <vincent.yang.fujitsu@gmail.com> wrote:
>> This patch adds new host controller driver for
>> Fujitsu SDHCI controller f_sdh30.
>>
>> Signed-off-by: Andy Green <andy.green@linaro.org>
>> Signed-off-by: Vincent Yang <Vincent.Yang@tw.fujitsu.com>
>> Signed-off-by: Tetsuya Takinishi <t.takinishi@jp.fujitsu.com>
>> ---
>>  .../devicetree/bindings/mmc/sdhci-fujitsu.txt      |  35 +++
>>  drivers/mmc/host/Kconfig                           |   8 +
>>  drivers/mmc/host/Makefile                          |   1 +
>>  drivers/mmc/host/sdhci_f_sdh30.c                   | 319 +++++++++++++++++++++
>>  4 files changed, 363 insertions(+)
>>  create mode 100644 Documentation/devicetree/bindings/mmc/sdhci-fujitsu.txt
>>  create mode 100644 drivers/mmc/host/sdhci_f_sdh30.c
>>
>> diff --git a/Documentation/devicetree/bindings/mmc/sdhci-fujitsu.txt b/Documentation/devicetree/bindings/mmc/sdhci-fujitsu.txt
>> new file mode 100644
>> index 0000000..d1a50f1
>> --- /dev/null
>> +++ b/Documentation/devicetree/bindings/mmc/sdhci-fujitsu.txt
>> @@ -0,0 +1,35 @@
>> +* Fujitsu SDHCI controller
>> +
>> +This file documents differences between the core properties in mmc.txt
>> +and the properties used by the sdhci_f_sdh30 driver.
>> +
>> +Required properties:
>> +- compatible: "fujitsu,mb86s70-sdhci-3.0"
>> +- voltage-ranges : This is a list of pairs. In each pair, two cells
>> +  are required. First cell specifies minimum slot voltage (mV), second
>> +  cell specifies maximum slot voltage (mV). In case of supported voltage
>> +  range is discontinuous, several ranges could be specified as a list.
>
> Can't these be modelled from a regulator instead? Thus using a "vmmc-supply"?

The purpose we added voltage-ranges is to set corresponding OCR bits.
We double checked it and figured out the voltage support bits of generic
sdhci register SDHCI_CAPABILITIES are already sufficient for it.
Thus we will remove "voltage-ranges" in next version.

>
>> +
>> +Optional properties:
>> +- vqmmc-supply: phandle to the regulator device tree node, mentioned
>> +  as the VCCQ/VDD_IO supply in the eMMC/SD specs.
>> +- clocks: Must contain an entry for each entry in clock-names. It is a
>> +  list of phandles and clock-specifier pairs.
>> +  See ../clocks/clock-bindings.txt for details.
>> +- clock-names: Should contain the following two entries:
>> +       "iface" - clock used for sdhci interface
>> +       "core"  - core clock for sdhci controller
>> +
>> +Example:
>> +
>> +       sdhci1: mmc@36600000 {
>> +               compatible = "fujitsu,mb86s70-sdhci-3.0";
>> +               reg = <0 0x36600000 0x1000>;
>> +               interrupts = <0 172 0x4>,
>> +                            <0 173 0x4>;
>> +               voltage-ranges = <1800 1800>, <3300 3300>;
>> +               bus-width = <4>;
>> +               vqmmc-supply = <&vccq_sdhci1>;
>> +               clocks = <&clock 2 2 0>, <&clock 2 3 0>;
>> +               clock-names = "iface", "core";
>> +       };
>> diff --git a/drivers/mmc/host/Kconfig b/drivers/mmc/host/Kconfig
>> index 2d6fbdd..288dcc3 100644
>> --- a/drivers/mmc/host/Kconfig
>> +++ b/drivers/mmc/host/Kconfig
>> @@ -290,6 +290,14 @@ config MMC_SDHCI_BCM2835
>>           This selects the BCM2835 SD/MMC controller. If you have a BCM2835
>>           platform with SD or MMC devices, say Y or M here.
>>
>> +config MMC_SDHCI_F_SDH30
>> +       tristate "SDHCI support for Fujitsu Semiconductor F_SDH30"
>> +       depends on MMC_SDHCI_PLTFM
>> +       depends on OF
>> +       help
>> +         This selects the Secure Digital Host Controller Interface (SDHCI)
>> +         Needed by some Fujitsu 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_MOXART
>> diff --git a/drivers/mmc/host/Makefile b/drivers/mmc/host/Makefile
>> index f7b0a77..6a7cfe0 100644
>> --- a/drivers/mmc/host/Makefile
>> +++ b/drivers/mmc/host/Makefile
>> @@ -16,6 +16,7 @@ obj-$(CONFIG_MMC_SDHCI_PXAV3) += sdhci-pxav3.o
>>  obj-$(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_SPEAR)  += sdhci-spear.o
>>  obj-$(CONFIG_MMC_WBSD)         += wbsd.o
>>  obj-$(CONFIG_MMC_AU1X)         += au1xmmc.o
>> diff --git a/drivers/mmc/host/sdhci_f_sdh30.c b/drivers/mmc/host/sdhci_f_sdh30.c
>> new file mode 100644
>> index 0000000..76df115
>> --- /dev/null
>> +++ b/drivers/mmc/host/sdhci_f_sdh30.c
>> @@ -0,0 +1,319 @@
>> +/*
>> + * linux/drivers/mmc/host/sdhci_f_sdh30.c
>> + *
>> + * Copyright (C) 2013 - 2014 Fujitsu Semiconductor, Ltd
>> + *              Vincent Yang <vincent.yang@tw.fujitsu.com>
>> + * Copyright (C) 2014 Linaro Ltd  Andy Green <andy.green@linaro.org>
>> + *
>> + * This program is free software: you can redistribute it and/or modify
>> + * it under the terms of the GNU General Public License as published by
>> + * the Free Software Foundation, version 2 of the License.
>> + */
>> +
>> +#include <linux/err.h>
>> +#include <linux/delay.h>
>> +#include <linux/module.h>
>> +#include <linux/mmc/sd.h>
>> +#include <linux/mmc/host.h>
>> +#include <linux/mmc/card.h>
>> +#include <linux/gpio.h>
>> +#include <linux/of_gpio.h>
>> +#include <linux/of_address.h>
>> +#include <linux/platform_device.h>
>> +#include <linux/pm.h>
>> +#include <linux/pm_runtime.h>
>> +#include <linux/suspend.h>
>> +
>> +#include "sdhci.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
>> +
>> +struct f_sdhost_priv {
>> +       struct clk *clk_iface;
>> +       struct clk *clk;
>> +       u32 vendor_hs200;
>> +       struct device *dev;
>> +};
>> +
>> +void sdhci_f_sdh30_soft_voltage_switch(struct sdhci_host *host)
>> +{
>> +       struct f_sdhost_priv *priv = sdhci_priv(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);
>> +
>> +       if (priv->vendor_hs200) {
>> +               dev_info(priv->dev, "%s: setting hs200\n", __func__);
>> +               ctrl = sdhci_readl(host, F_SDH30_ESD_CONTROL);
>> +               ctrl |= priv->vendor_hs200;
>> +               sdhci_writel(host, ctrl, F_SDH30_ESD_CONTROL);
>> +       }
>> +
>> +       ctrl = sdhci_readl(host, F_SDH30_TUNING_SETTING);
>> +       ctrl |= F_SDH30_CMD_CHK_DIS;
>> +       sdhci_writel(host, ctrl, F_SDH30_TUNING_SETTING);
>> +}
>> +
>> +unsigned int sdhci_f_sdh30_get_min_clock(struct sdhci_host *host)
>> +{
>> +       return F_SDH30_MIN_CLOCK;
>> +}
>> +
>> +void sdhci_f_sdh30_reset(struct sdhci_host *host, u8 mask)
>> +{
>> +       if (sdhci_readw(host, SDHCI_CLOCK_CONTROL) == 0)
>> +               sdhci_writew(host, 0xBC01, SDHCI_CLOCK_CONTROL);
>> +
>> +       sdhci_reset(host, mask);
>> +}
>> +
>> +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,
>> +       .reset = sdhci_f_sdh30_reset,
>> +       .set_clock = sdhci_set_clock,
>> +       .set_bus_width = sdhci_set_bus_width,
>> +       .set_uhs_signaling = sdhci_set_uhs_signaling,
>> +};
>> +
>> +static int sdhci_f_sdh30_probe(struct platform_device *pdev)
>> +{
>> +       struct sdhci_host *host;
>> +       struct device *dev = &pdev->dev;
>> +       int irq, ctrl = 0, ret = 0;
>> +       struct f_sdhost_priv *priv;
>> +       u32 reg = 0;
>> +
>> +       irq = platform_get_irq(pdev, 0);
>> +       if (irq < 0) {
>> +               dev_err(dev, "%s: no irq specified\n", __func__);
>> +               ret = irq;
>> +               goto err;
>> +       }
>> +
>> +       host = sdhci_alloc_host(dev, sizeof(struct sdhci_host) +
>> +                                               sizeof(struct f_sdhost_priv));
>> +       if (IS_ERR(host)) {
>> +               dev_err(dev, "%s: host allocate error\n", __func__);
>
> No need to print this, already done via kzalloc().

Yes, we will remove it.

>
>> +               ret = -ENOMEM;
>> +               goto err;
>> +       }
>> +       priv = sdhci_priv(host);
>> +       priv->dev = dev;
>> +
>> +       host->quirks = SDHCI_QUIRK_NO_ENDATTR_IN_NOPDESC |
>> +                      SDHCI_QUIRK_INVERTED_WRITE_PROTECT;
>> +       host->quirks2 = SDHCI_QUIRK2_SUPPORT_SINGLE |
>> +                       SDHCI_QUIRK2_TUNING_WORK_AROUND;
>> +
>> +       ret = mmc_of_parse(host->mmc);
>> +       if (ret)
>> +               goto err_of_parse;
>> +
>> +       ret = mmc_of_parse_voltage(pdev->dev.of_node, &host->ocr_mask);
>> +       if (ret)
>> +               goto err_of_parse;
>> +
>> +       platform_set_drvdata(pdev, host);
>> +
>> +       sdhci_get_of_property(pdev);
>> +       host->hw_name = "f_sdh30";
>> +       host->ops = &sdhci_f_sdh30_ops;
>> +       host->irq = irq;
>> +
>> +       host->ioaddr = of_iomap(pdev->dev.of_node, 0);
>
> How about using devm_ioremap_resource()?

Yes, we will use it in next version.

>
>> +       if (!host->ioaddr) {
>> +               dev_err(dev, "%s: failed to remap registers\n", __func__);
>> +               ret = -ENXIO;
>> +               goto err_remap;
>> +       }
>> +
>> +       priv->clk_iface = clk_get(&pdev->dev, "iface");
>
> devm_clk_get()

We will use it.

>
>> +       if (!IS_ERR(priv->clk_iface)) {
>> +               ret = clk_prepare_enable(priv->clk_iface);
>> +               if (ret < 0) {
>> +                       dev_err(dev, "Failed to enable iface clock: %d\n", ret);
>> +                       goto err_clk1;
>> +               }
>> +       }
>> +       priv->clk = clk_get(&pdev->dev, "core");
>
> devm_clk_get()

We will use it.

>
>> +       if (!IS_ERR(priv->clk)) {
>> +               ret = clk_prepare_enable(priv->clk);
>> +               if (ret < 0) {
>> +                       dev_err(dev, "Failed to enable core clock: %d\n", ret);
>> +                       goto err_clk2;
>> +               }
>> +       }
>> +
>> +#ifdef CONFIG_PM_RUNTIME
>
> Remove this #ifdef.

We will remove it.

>
>> +       pm_runtime_set_active(&pdev->dev);
>> +       pm_runtime_enable(&pdev->dev);
>> +       ret = pm_runtime_get_sync(&pdev->dev);
>
> Why do a pm_runtime_get_sync() without a balanced call to
> pm_runtime_put()? That will keep the device forever runtime PM
> resumed.

Yes, we need to keep it runtime PM resumed here.
We will add a pm_runtime_put_noidle() on module removal in next version.

>
>> +       if (ret < 0)
>> +               dev_err(dev, "Failed to pm_runtime_get_sync: %d\n", ret);
>> +#endif
>> +
>> +       ret = sdhci_add_host(host);
>> +       if (ret) {
>> +               dev_err(dev, "%s: host add error\n", __func__);
>> +               goto err_add_host;
>> +       }
>> +
>> +       /* init vendor specific regs */
>
> All this vendor specfic stuff must be done prior you invoke
> sdhci_add_host(), otherwise you will start the card initialization
> before this driver is fully probed.

We will fix it.
Thanks a lot for pointing it out.

>
>> +       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;
>> +       else
>> +               priv->vendor_hs200 = 0;
>> +
>> +       return 0;
>> +
>> +err_add_host:
>> +       clk_put(priv->clk);
>> +err_clk2:
>> +       clk_put(priv->clk_iface);
>> +err_clk1:
>> +       iounmap(host->ioaddr);
>> +err_remap:
>> +err_of_parse:
>> +       sdhci_free_host(host);
>> +err:
>> +       return ret;
>
> If you use the devm_* managed functions as I pointed out above, this
> error handling will be greatly simplified.

We will update the error handling accordingly.
Thanks a lot for your advice.

>
>> +}
>> +
>> +static int sdhci_f_sdh30_remove(struct platform_device *pdev)
>> +{
>> +       struct sdhci_host *host = platform_get_drvdata(pdev);
>> +       struct f_sdhost_priv *priv = sdhci_priv(host);
>> +       struct resource *iomem = platform_get_resource(pdev, IORESOURCE_MEM, 0);
>> +
>
> Don't forget to handle runtime PM here. You probably would like this:
> pm_runtime_get_sync()
> pm_runtime_disable()
> pm_runtime_put_noidle()

Yes, we will add them in next version.

>
>> +       sdhci_remove_host(host, readl(host->ioaddr + SDHCI_INT_STATUS) ==
>> +                         0xffffffff);
>> +       iounmap(host->ioaddr);
>> +       release_mem_region(iomem->start, resource_size(iomem));
>> +
>> +       clk_disable_unprepare(priv->clk_iface);
>> +       clk_disable_unprepare(priv->clk);
>> +
>> +       clk_put(priv->clk);
>> +       clk_put(priv->clk_iface);
>> +
>> +       sdhci_free_host(host);
>> +       platform_set_drvdata(pdev, NULL);
>> +
>> +       return 0;
>> +}
>> +
>> +#ifdef CONFIG_PM_SLEEP
>> +static int sdhci_f_sdh30_suspend(struct device *dev)
>> +{
>> +       struct sdhci_host *host = dev_get_drvdata(dev);
>> +
>> +       return sdhci_suspend_host(host);
>> +}
>> +
>> +static int sdhci_f_sdh30_resume(struct device *dev)
>> +{
>> +       struct sdhci_host *host = dev_get_drvdata(dev);
>> +
>> +       return sdhci_resume_host(host);
>> +}
>> +#endif
>> +
>> +#ifdef CONFIG_PM_RUNTIME
>
> ->CONFIG_PM

We will modify it.

>
>> +static int sdhci_f_sdh30_runtime_suspend(struct device *dev)
>> +{
>> +       struct sdhci_host *host = dev_get_drvdata(dev);
>> +
>> +       return sdhci_runtime_suspend_host(host);
>> +}
>> +
>> +static int sdhci_f_sdh30_runtime_resume(struct device *dev)
>> +{
>> +       struct sdhci_host *host = dev_get_drvdata(dev);
>> +
>> +       return sdhci_runtime_resume_host(host);
>> +}
>> +#endif
>> +
>> +#ifdef CONFIG_PM
>
> Remove #ifdef

We will remove it.

>
>> +static const struct dev_pm_ops sdhci_f_sdh30_pmops = {
>> +       SET_SYSTEM_SLEEP_PM_OPS(sdhci_f_sdh30_suspend, sdhci_f_sdh30_resume)
>> +       SET_RUNTIME_PM_OPS(sdhci_f_sdh30_runtime_suspend,
>> +                          sdhci_f_sdh30_runtime_resume, NULL)
>> +};
>> +
>> +#define SDHCI_F_SDH30_PMOPS (&sdhci_f_sdh30_pmops)
>
> Remove this and use &sdhci_f_sdh30_pmops directly below instead.

We will modify it.
Thanks a lot for your review and comments!


Kind regards,
Vincent

>
>> +
>> +#else
>> +#define SDHCI_F_SDH30_PMOPS NULL
>> +#endif
>> +
>> +static const struct of_device_id f_sdh30_dt_ids[] = {
>> +       { .compatible = "fujitsu,mb86s70-sdhci-3.0" },
>> +       { /* sentinel */ }
>> +};
>> +MODULE_DEVICE_TABLE(of, f_sdh30_dt_ids);
>> +
>> +static struct platform_driver sdhci_f_sdh30_driver = {
>> +       .driver = {
>> +               .name = "f_sdh30",
>> +               .of_match_table = f_sdh30_dt_ids,
>> +#ifdef CONFIG_PM_SLEEP
>> +               .pm     = SDHCI_F_SDH30_PMOPS,
>> +#endif
>> +       },
>> +       .probe  = sdhci_f_sdh30_probe,
>> +       .remove = sdhci_f_sdh30_remove,
>> +};
>> +
>> +module_platform_driver(sdhci_f_sdh30_driver);
>> +
>> +MODULE_DESCRIPTION("F_SDH30 SD Card Controller driver");
>> +MODULE_LICENSE("GPL v2");
>> +MODULE_AUTHOR("FUJITSU SEMICONDUCTOR LTD.");
>> +MODULE_ALIAS("platform:f_sdh30");
>> --
>> 1.9.0
>>
>
> Kind regards
> Uffe