[PATCH v2 4/4] mmc: sdhci: host: add new f_sdh30
Vincent Yang
vincent.yang.fujitsu at gmail.com
Mon Jan 5 19:50:36 PST 2015
2014-12-30 21:53 GMT+08:00 Ulf Hansson <ulf.hansson at linaro.org>:
> On 15 December 2014 at 08:30, Vincent Yang
> <vincent.yang.fujitsu at gmail.com> wrote:
>> This patch adds new host controller driver for
>> Fujitsu SDHCI controller f_sdh30.
>>
>> Signed-off-by: Andy Green <andy.green at linaro.org>
>> Signed-off-by: Vincent Yang <Vincent.Yang at tw.fujitsu.com>
>> Signed-off-by: Tetsuya Takinishi <t.takinishi at 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 at 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 at tw.fujitsu.com>
>> + * Copyright (C) 2014 Linaro Ltd Andy Green <andy.green at 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
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