Patchwork [1/4] mmc: sdhci: add a driver for Berlin SoCs

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Submitter Antoine Ténart
Date April 16, 2014, 12:40 p.m.
Message ID <1397652011-21284-2-git-send-email-antoine.tenart@free-electrons.com>
Download mbox | patch
Permalink /patch/339573/
State New
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Comments

Antoine Ténart - April 16, 2014, 12:40 p.m.
Add a Driver to support the SDHCI controller of the Marvell Berlin SoCs.
This controller supports 3 sockets.

Signed-off-by: Antoine Ténart <antoine.tenart@free-electrons.com>
---
 drivers/mmc/host/Kconfig        |  11 ++++
 drivers/mmc/host/Makefile       |   1 +
 drivers/mmc/host/sdhci-berlin.c | 129 ++++++++++++++++++++++++++++++++++++++++
 3 files changed, 141 insertions(+)
 create mode 100644 drivers/mmc/host/sdhci-berlin.c
Joe Perches - April 16, 2014, 12:56 p.m.
On Wed, 2014-04-16 at 14:40 +0200, Antoine Ténart wrote:
> Add a Driver to support the SDHCI controller of the Marvell Berlin SoCs.
> This controller supports 3 sockets.

trivial notes:

> diff --git a/drivers/mmc/host/sdhci-berlin.c b/drivers/mmc/host/sdhci-berlin.c
[]
> +static struct sdhci_ops sdhci_berlin_ops = {
> +	.get_max_clock = sdhci_pltfm_clk_get_max_clock,
> +};
> +
> +static struct sdhci_pltfm_data sdhci_berlin2_pdata = {
> +	.quirks	= SDHCI_QUIRK_CAP_CLOCK_BASE_BROKEN |
> +		  SDHCI_QUIRK_BROKEN_ADMA |
> +		  SDHCI_QUIRK_BROKEN_TIMEOUT_VAL,
> +	.ops = &sdhci_berlin_ops,
> +};
> +
> +static struct sdhci_pltfm_data sdhci_berlin2q_pdata = {
> +	.quirks	= SDHCI_QUIRK_CAP_CLOCK_BASE_BROKEN |
> +		  SDHCI_QUIRK_INVERTED_WRITE_PROTECT |
> +		  SDHCI_QUIRK_BROKEN_TIMEOUT_VAL,
> +	.ops = &sdhci_berlin_ops,
> +};

Perhaps const?

> +static int sdhci_berlin_probe(struct platform_device *pdev)
> +{
[]
> +	host = sdhci_pltfm_init(pdev,
> +				(struct sdhci_pltfm_data *)device->data, 0);

Unnecessary cast?  Maybe:

	host = sdhci_pltfm_init(pdev, device->data, 0);

> +	if (IS_ERR(host))
> +		return PTR_ERR(host);
> +
> +	pltfm_host = sdhci_priv(host);
> +
> +	clk = devm_clk_get(dev, NULL);
> +	if (IS_ERR(clk)) {
> +		dev_err(dev, "could not get clock: %ld\n", PTR_ERR(clk));
> +		ret = PTR_ERR(clk);

PTR_ERR is an int.  Does this produce a compile warning?
Maybe reverse these lines and use ret?

		ret = PTR_ERR(clk);
		dev_err(dev, count not get clock: %d\n", ret);
Antoine Ténart - April 16, 2014, 1:09 p.m.
Joe,

On Wed, Apr 16, 2014 at 05:56:34AM -0700, Joe Perches wrote:
> On Wed, 2014-04-16 at 14:40 +0200, Antoine Ténart wrote:
> > Add a Driver to support the SDHCI controller of the Marvell Berlin SoCs.
> > This controller supports 3 sockets.
> 
> trivial notes:
> 
> > diff --git a/drivers/mmc/host/sdhci-berlin.c b/drivers/mmc/host/sdhci-berlin.c
> []
> > +static struct sdhci_ops sdhci_berlin_ops = {
> > +	.get_max_clock = sdhci_pltfm_clk_get_max_clock,
> > +};
> > +
> > +static struct sdhci_pltfm_data sdhci_berlin2_pdata = {
> > +	.quirks	= SDHCI_QUIRK_CAP_CLOCK_BASE_BROKEN |
> > +		  SDHCI_QUIRK_BROKEN_ADMA |
> > +		  SDHCI_QUIRK_BROKEN_TIMEOUT_VAL,
> > +	.ops = &sdhci_berlin_ops,
> > +};
> > +
> > +static struct sdhci_pltfm_data sdhci_berlin2q_pdata = {
> > +	.quirks	= SDHCI_QUIRK_CAP_CLOCK_BASE_BROKEN |
> > +		  SDHCI_QUIRK_INVERTED_WRITE_PROTECT |
> > +		  SDHCI_QUIRK_BROKEN_TIMEOUT_VAL,
> > +	.ops = &sdhci_berlin_ops,
> > +};
> 
> Perhaps const?

Yes, sure. I'll fix that.

> 
> > +static int sdhci_berlin_probe(struct platform_device *pdev)
> > +{
> []
> > +	host = sdhci_pltfm_init(pdev,
> > +				(struct sdhci_pltfm_data *)device->data, 0);
> 
> Unnecessary cast?  Maybe:
> 
> 	host = sdhci_pltfm_init(pdev, device->data, 0);

Right.

> 
> > +	if (IS_ERR(host))
> > +		return PTR_ERR(host);
> > +
> > +	pltfm_host = sdhci_priv(host);
> > +
> > +	clk = devm_clk_get(dev, NULL);
> > +	if (IS_ERR(clk)) {
> > +		dev_err(dev, "could not get clock: %ld\n", PTR_ERR(clk));
> > +		ret = PTR_ERR(clk);
> 
> PTR_ERR is an int.  Does this produce a compile warning?

It does, I had a warning.

> Maybe reverse these lines and use ret?
> 
> 		ret = PTR_ERR(clk);
> 		dev_err(dev, count not get clock: %d\n", ret);

That's better. Will do.

Thanks !

Antoine
Sebastian Hesselbarth - April 16, 2014, 2:26 p.m.
On 04/16/2014 02:40 PM, Antoine Ténart wrote:
> Add a Driver to support the SDHCI controller of the Marvell Berlin SoCs.
> This controller supports 3 sockets.

nit: Isn't it three controller with one socket each?

> Signed-off-by: Antoine Ténart <antoine.tenart@free-electrons.com>
> ---
>   drivers/mmc/host/Kconfig        |  11 ++++
>   drivers/mmc/host/Makefile       |   1 +
>   drivers/mmc/host/sdhci-berlin.c | 129 ++++++++++++++++++++++++++++++++++++++++
>   3 files changed, 141 insertions(+)
>   create mode 100644 drivers/mmc/host/sdhci-berlin.c
>
> diff --git a/drivers/mmc/host/Kconfig b/drivers/mmc/host/Kconfig
> index 1384f67abe21..42db70031eb2 100644
> --- a/drivers/mmc/host/Kconfig
> +++ b/drivers/mmc/host/Kconfig
> @@ -283,6 +283,17 @@ config MMC_SDHCI_BCM2835
>
>   	  If unsure, say N.
>
> +config MMC_SDHCI_BERLIN
> +	tristate "Marvell Berlin SD/MMC Host Controller support"
> +	depends on ARCH_BERLIN
> +	depends on MMC_SDHCI_PLTFM
> +	select MMC_SDHCI_IO_ACCESSORS
> +	help
> +	  This selects the Berlin SD/MMC controller. If you have a Berlin
> +	  platform with SD or MMC devices, say Y or M here.
> +
> +	  If unsure, say N.
> +
>   config MMC_OMAP
>   	tristate "TI OMAP Multimedia Card Interface support"
>   	depends on ARCH_OMAP
> diff --git a/drivers/mmc/host/Makefile b/drivers/mmc/host/Makefile
> index 3483b6b6b880..b0256290530c 100644
> --- a/drivers/mmc/host/Makefile
> +++ b/drivers/mmc/host/Makefile
> @@ -64,6 +64,7 @@ obj-$(CONFIG_MMC_SDHCI_OF_ESDHC)	+= sdhci-of-esdhc.o
>   obj-$(CONFIG_MMC_SDHCI_OF_HLWD)		+= sdhci-of-hlwd.o
>   obj-$(CONFIG_MMC_SDHCI_BCM_KONA)	+= sdhci-bcm-kona.o
>   obj-$(CONFIG_MMC_SDHCI_BCM2835)		+= sdhci-bcm2835.o
> +obj-$(CONFIG_MMC_SDHCI_BERLIN)		+= sdhci-berlin.o
>
>   ifeq ($(CONFIG_CB710_DEBUG),y)
>   	CFLAGS-cb710-mmc	+= -DDEBUG
> diff --git a/drivers/mmc/host/sdhci-berlin.c b/drivers/mmc/host/sdhci-berlin.c
> new file mode 100644
> index 000000000000..ece8f7863937
> --- /dev/null
> +++ b/drivers/mmc/host/sdhci-berlin.c
> @@ -0,0 +1,129 @@
> +/*
> + * Marvell Berlin SDHCI driver
> + *
> + * Copyright (C) 2014 Marvell Technology Group Ltd.
> + *
> + * Antoine Ténart <antoine.tenart@free-electrons.com>
> + *
> + * This file is licensed under the terms of the GNU General Public
> + * License version 2. This program is licensed "as is" without any
> + * warranty of any kind, whether express or implied
> + */
> +
> +#include <linux/clk.h>
> +#include <linux/err.h>
> +#include <linux/io.h>
> +#include <linux/mmc/host.h>
> +#include <linux/module.h>
> +#include <linux/of.h>
> +#include <linux/of_device.h>
> +
> +#include "sdhci-pltfm.h"
> +
> +static struct sdhci_ops sdhci_berlin_ops = {
> +	.get_max_clock = sdhci_pltfm_clk_get_max_clock,
> +};
> +
> +static struct sdhci_pltfm_data sdhci_berlin2_pdata = {
> +	.quirks	= SDHCI_QUIRK_CAP_CLOCK_BASE_BROKEN |
> +		  SDHCI_QUIRK_BROKEN_ADMA |
> +		  SDHCI_QUIRK_BROKEN_TIMEOUT_VAL,
> +	.ops = &sdhci_berlin_ops,
> +};
> +
> +static struct sdhci_pltfm_data sdhci_berlin2q_pdata = {
> +	.quirks	= SDHCI_QUIRK_CAP_CLOCK_BASE_BROKEN |
> +		  SDHCI_QUIRK_INVERTED_WRITE_PROTECT |
> +		  SDHCI_QUIRK_BROKEN_TIMEOUT_VAL,
> +	.ops = &sdhci_berlin_ops,
> +};
> +
> +static const struct of_device_id sdhci_berlin_of_match_table[] = {
> +	{
> +		.compatible = "marvell,berlin2-sdhci",
> +		.data = &sdhci_berlin2_pdata,
> +	},
> +	{
> +		.compatible = "marvell,berlin2cd-sdhci",
> +		.data = &sdhci_berlin2_pdata,
> +	},
> +	{
> +		.compatible = "marvell,berlin2q-sdhci",
> +		.data = &sdhci_berlin2q_pdata,
> +	},
> +	{}
> +};
> +MODULE_DEVICE_TABLE(of, sdhci_berlin_of_match_table);
> +
> +static int sdhci_berlin_probe(struct platform_device *pdev)
> +{
> +	struct device *dev = &pdev->dev;
> +	struct sdhci_host *host;
> +	struct sdhci_pltfm_host *pltfm_host;
> +	struct clk *clk;
> +	const struct of_device_id *device =
> +		of_match_device(sdhci_berlin_of_match_table, dev);
> +	int ret;
> +
> +	host = sdhci_pltfm_init(pdev,
> +				(struct sdhci_pltfm_data *)device->data, 0);
> +	if (IS_ERR(host))
> +		return PTR_ERR(host);
> +
> +	pltfm_host = sdhci_priv(host);
> +
> +	clk = devm_clk_get(dev, NULL);
> +	if (IS_ERR(clk)) {
> +		dev_err(dev, "could not get clock: %ld\n", PTR_ERR(clk));
> +		ret = PTR_ERR(clk);
> +		goto err_clk_get;
> +	}
> +
> +	clk_prepare_enable(clk);
> +	pltfm_host->clk = clk;
> +
> +	sdhci_get_of_property(pdev);
> +
> +	if (host->quirks & SDHCI_QUIRK_BROKEN_CARD_DETECTION)
> +		host->mmc->caps |= MMC_CAP_NONREMOVABLE;

Documentation/devicetree/bindings/mmc/mmc.txt names "non-removable"
as a standard property. Any chance we can shove this two lines above
right into sdhci_get_of_property()?

Besides the other comments from Joe, this looks good to me,

Reviewed-by: Sebastian Hesselbarth <sebastian.hesselbarth@gmail.com>

> +
> +	ret = sdhci_add_host(host);
> +	if (ret)
> +		goto err_add_host;
> +
> +	return 0;
> +
> +err_add_host:
> +	clk_disable_unprepare(pltfm_host->clk);
> +err_clk_get:
> +	sdhci_pltfm_free(pdev);
> +
> +	return ret;
> +}
> +
> +static int sdhci_berlin_remove(struct platform_device *pdev)
> +{
> +	struct sdhci_host *host = platform_get_drvdata(pdev);
> +	struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host);
> +
> +	sdhci_pltfm_unregister(pdev);
> +	clk_disable_unprepare(pltfm_host->clk);
> +
> +	return 0;
> +}
> +
> +static struct platform_driver sdhci_berlin_driver = {
> +	.driver		= {
> +		.name	= "berlin-sdhci",
> +		.owner	= THIS_MODULE,
> +		.pm	= SDHCI_PLTFM_PMOPS,
> +		.of_match_table = sdhci_berlin_of_match_table,
> +	},
> +	.probe		= sdhci_berlin_probe,
> +	.remove		= sdhci_berlin_remove,
> +};
> +module_platform_driver(sdhci_berlin_driver);
> +
> +MODULE_DESCRIPTION("SDHCI driver for Marvell Berlin SoC");
> +MODULE_AUTHOR("Antoine Ténart <antoine.tenart@free-electrons.com>");
> +MODULE_LICENSE("GPL");
>
Antoine Ténart - April 17, 2014, 1:33 p.m.
Sebastian,

On Wed, Apr 16, 2014 at 04:26:06PM +0200, Sebastian Hesselbarth wrote:
> On 04/16/2014 02:40 PM, Antoine Ténart wrote:
> >Add a Driver to support the SDHCI controller of the Marvell Berlin SoCs.
> >This controller supports 3 sockets.
> 
> nit: Isn't it three controller with one socket each?

It's a little bit confusing, there are 3 different register regions and
I can see 3 separate data lines but, I quote: "The SD host controller
supports three sockets".

Maybe Jisheng can advise on that matter ?

> 
> >Signed-off-by: Antoine Ténart <antoine.tenart@free-electrons.com>
> >---
> >  drivers/mmc/host/Kconfig        |  11 ++++
> >  drivers/mmc/host/Makefile       |   1 +
> >  drivers/mmc/host/sdhci-berlin.c | 129 ++++++++++++++++++++++++++++++++++++++++
> >  3 files changed, 141 insertions(+)
> >  create mode 100644 drivers/mmc/host/sdhci-berlin.c
> >
> >diff --git a/drivers/mmc/host/Kconfig b/drivers/mmc/host/Kconfig
> >index 1384f67abe21..42db70031eb2 100644
> >--- a/drivers/mmc/host/Kconfig
> >+++ b/drivers/mmc/host/Kconfig
> >@@ -283,6 +283,17 @@ config MMC_SDHCI_BCM2835
> >
> >  	  If unsure, say N.
> >
> >+config MMC_SDHCI_BERLIN
> >+	tristate "Marvell Berlin SD/MMC Host Controller support"
> >+	depends on ARCH_BERLIN
> >+	depends on MMC_SDHCI_PLTFM
> >+	select MMC_SDHCI_IO_ACCESSORS
> >+	help
> >+	  This selects the Berlin SD/MMC controller. If you have a Berlin
> >+	  platform with SD or MMC devices, say Y or M here.
> >+
> >+	  If unsure, say N.
> >+
> >  config MMC_OMAP
> >  	tristate "TI OMAP Multimedia Card Interface support"
> >  	depends on ARCH_OMAP
> >diff --git a/drivers/mmc/host/Makefile b/drivers/mmc/host/Makefile
> >index 3483b6b6b880..b0256290530c 100644
> >--- a/drivers/mmc/host/Makefile
> >+++ b/drivers/mmc/host/Makefile
> >@@ -64,6 +64,7 @@ obj-$(CONFIG_MMC_SDHCI_OF_ESDHC)	+= sdhci-of-esdhc.o
> >  obj-$(CONFIG_MMC_SDHCI_OF_HLWD)		+= sdhci-of-hlwd.o
> >  obj-$(CONFIG_MMC_SDHCI_BCM_KONA)	+= sdhci-bcm-kona.o
> >  obj-$(CONFIG_MMC_SDHCI_BCM2835)		+= sdhci-bcm2835.o
> >+obj-$(CONFIG_MMC_SDHCI_BERLIN)		+= sdhci-berlin.o
> >
> >  ifeq ($(CONFIG_CB710_DEBUG),y)
> >  	CFLAGS-cb710-mmc	+= -DDEBUG
> >diff --git a/drivers/mmc/host/sdhci-berlin.c b/drivers/mmc/host/sdhci-berlin.c
> >new file mode 100644
> >index 000000000000..ece8f7863937
> >--- /dev/null
> >+++ b/drivers/mmc/host/sdhci-berlin.c
> >@@ -0,0 +1,129 @@
> >+/*
> >+ * Marvell Berlin SDHCI driver
> >+ *
> >+ * Copyright (C) 2014 Marvell Technology Group Ltd.
> >+ *
> >+ * Antoine Ténart <antoine.tenart@free-electrons.com>
> >+ *
> >+ * This file is licensed under the terms of the GNU General Public
> >+ * License version 2. This program is licensed "as is" without any
> >+ * warranty of any kind, whether express or implied
> >+ */
> >+
> >+#include <linux/clk.h>
> >+#include <linux/err.h>
> >+#include <linux/io.h>
> >+#include <linux/mmc/host.h>
> >+#include <linux/module.h>
> >+#include <linux/of.h>
> >+#include <linux/of_device.h>
> >+
> >+#include "sdhci-pltfm.h"
> >+
> >+static struct sdhci_ops sdhci_berlin_ops = {
> >+	.get_max_clock = sdhci_pltfm_clk_get_max_clock,
> >+};
> >+
> >+static struct sdhci_pltfm_data sdhci_berlin2_pdata = {
> >+	.quirks	= SDHCI_QUIRK_CAP_CLOCK_BASE_BROKEN |
> >+		  SDHCI_QUIRK_BROKEN_ADMA |
> >+		  SDHCI_QUIRK_BROKEN_TIMEOUT_VAL,
> >+	.ops = &sdhci_berlin_ops,
> >+};
> >+
> >+static struct sdhci_pltfm_data sdhci_berlin2q_pdata = {
> >+	.quirks	= SDHCI_QUIRK_CAP_CLOCK_BASE_BROKEN |
> >+		  SDHCI_QUIRK_INVERTED_WRITE_PROTECT |
> >+		  SDHCI_QUIRK_BROKEN_TIMEOUT_VAL,
> >+	.ops = &sdhci_berlin_ops,
> >+};
> >+
> >+static const struct of_device_id sdhci_berlin_of_match_table[] = {
> >+	{
> >+		.compatible = "marvell,berlin2-sdhci",
> >+		.data = &sdhci_berlin2_pdata,
> >+	},
> >+	{
> >+		.compatible = "marvell,berlin2cd-sdhci",
> >+		.data = &sdhci_berlin2_pdata,
> >+	},
> >+	{
> >+		.compatible = "marvell,berlin2q-sdhci",
> >+		.data = &sdhci_berlin2q_pdata,
> >+	},
> >+	{}
> >+};
> >+MODULE_DEVICE_TABLE(of, sdhci_berlin_of_match_table);
> >+
> >+static int sdhci_berlin_probe(struct platform_device *pdev)
> >+{
> >+	struct device *dev = &pdev->dev;
> >+	struct sdhci_host *host;
> >+	struct sdhci_pltfm_host *pltfm_host;
> >+	struct clk *clk;
> >+	const struct of_device_id *device =
> >+		of_match_device(sdhci_berlin_of_match_table, dev);
> >+	int ret;
> >+
> >+	host = sdhci_pltfm_init(pdev,
> >+				(struct sdhci_pltfm_data *)device->data, 0);
> >+	if (IS_ERR(host))
> >+		return PTR_ERR(host);
> >+
> >+	pltfm_host = sdhci_priv(host);
> >+
> >+	clk = devm_clk_get(dev, NULL);
> >+	if (IS_ERR(clk)) {
> >+		dev_err(dev, "could not get clock: %ld\n", PTR_ERR(clk));
> >+		ret = PTR_ERR(clk);
> >+		goto err_clk_get;
> >+	}
> >+
> >+	clk_prepare_enable(clk);
> >+	pltfm_host->clk = clk;
> >+
> >+	sdhci_get_of_property(pdev);
> >+
> >+	if (host->quirks & SDHCI_QUIRK_BROKEN_CARD_DETECTION)
> >+		host->mmc->caps |= MMC_CAP_NONREMOVABLE;
> 
> Documentation/devicetree/bindings/mmc/mmc.txt names "non-removable"
> as a standard property. Any chance we can shove this two lines above
> right into sdhci_get_of_property()?

Well, I gave it a try without this quirk and it seemed to work fine.
If we find out we do need it, I agree to add this quirk in
sdhci_get_of_property().

Antoine

> 
> Besides the other comments from Joe, this looks good to me,
> 
> Reviewed-by: Sebastian Hesselbarth <sebastian.hesselbarth@gmail.com>
> 
> >+
> >+	ret = sdhci_add_host(host);
> >+	if (ret)
> >+		goto err_add_host;
> >+
> >+	return 0;
> >+
> >+err_add_host:
> >+	clk_disable_unprepare(pltfm_host->clk);
> >+err_clk_get:
> >+	sdhci_pltfm_free(pdev);
> >+
> >+	return ret;
> >+}
> >+
> >+static int sdhci_berlin_remove(struct platform_device *pdev)
> >+{
> >+	struct sdhci_host *host = platform_get_drvdata(pdev);
> >+	struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host);
> >+
> >+	sdhci_pltfm_unregister(pdev);
> >+	clk_disable_unprepare(pltfm_host->clk);
> >+
> >+	return 0;
> >+}
> >+
> >+static struct platform_driver sdhci_berlin_driver = {
> >+	.driver		= {
> >+		.name	= "berlin-sdhci",
> >+		.owner	= THIS_MODULE,
> >+		.pm	= SDHCI_PLTFM_PMOPS,
> >+		.of_match_table = sdhci_berlin_of_match_table,
> >+	},
> >+	.probe		= sdhci_berlin_probe,
> >+	.remove		= sdhci_berlin_remove,
> >+};
> >+module_platform_driver(sdhci_berlin_driver);
> >+
> >+MODULE_DESCRIPTION("SDHCI driver for Marvell Berlin SoC");
> >+MODULE_AUTHOR("Antoine Ténart <antoine.tenart@free-electrons.com>");
> >+MODULE_LICENSE("GPL");
> >
>
Jisheng Zhang - April 18, 2014, 6:06 a.m.
Hi,

On Thu, 17 Apr 2014 06:33:59 -0700
Antoine Ténart <antoine.tenart@free-electrons.com> wrote:

> Sebastian,
> 
> On Wed, Apr 16, 2014 at 04:26:06PM +0200, Sebastian Hesselbarth wrote:
> > On 04/16/2014 02:40 PM, Antoine Ténart wrote:
> > >Add a Driver to support the SDHCI controller of the Marvell Berlin SoCs.
> > >This controller supports 3 sockets.
> > 
> > nit: Isn't it three controller with one socket each?
> 
> It's a little bit confusing, there are 3 different register regions and
> I can see 3 separate data lines but, I quote: "The SD host controller
> supports three sockets".
> 
> Maybe Jisheng can advise on that matter ?


It's three controller with one socket each ;)

Thanks
Antoine Ténart - April 18, 2014, 7:20 a.m.
Hi all,

On Wed, Apr 16, 2014 at 02:40:08PM +0200, Antoine Ténart wrote:
> Add a Driver to support the SDHCI controller of the Marvell Berlin SoCs.
> This controller supports 3 sockets.

After talking a bit with Sebastian and Jisheng I decided to have a look on the
pxav3 driver. I gave it a try, it seemed to be compatible with the Berlin SDHCI
controller so I'll use this one instead of adding a Berlin specific one.

You all can forget this one, I'll send a v2 using the pxav3 driver.

Thanks!

Antoine
Ben Dooks - May 9, 2014, 3:55 p.m.
On 16/04/14 13:40, Antoine Ténart wrote:
> Add a Driver to support the SDHCI controller of the Marvell Berlin SoCs.
> This controller supports 3 sockets.

[snip]

> +
> +static struct sdhci_ops sdhci_berlin_ops = {
> +	.get_max_clock = sdhci_pltfm_clk_get_max_clock,
> +};
> +
> +static struct sdhci_pltfm_data sdhci_berlin2_pdata = {
> +	.quirks	= SDHCI_QUIRK_CAP_CLOCK_BASE_BROKEN |
> +		  SDHCI_QUIRK_BROKEN_ADMA |
> +		  SDHCI_QUIRK_BROKEN_TIMEOUT_VAL,
> +	.ops = &sdhci_berlin_ops,
> +};
> +
> +static struct sdhci_pltfm_data sdhci_berlin2q_pdata = {
> +	.quirks	= SDHCI_QUIRK_CAP_CLOCK_BASE_BROKEN |
> +		  SDHCI_QUIRK_INVERTED_WRITE_PROTECT |
> +		  SDHCI_QUIRK_BROKEN_TIMEOUT_VAL,
> +	.ops = &sdhci_berlin_ops,
> +};
> +
> +static const struct of_device_id sdhci_berlin_of_match_table[] = {
> +	{
> +		.compatible = "marvell,berlin2-sdhci",
> +		.data = &sdhci_berlin2_pdata,
> +	},
> +	{
> +		.compatible = "marvell,berlin2cd-sdhci",
> +		.data = &sdhci_berlin2_pdata,
> +	},
> +	{
> +		.compatible = "marvell,berlin2q-sdhci",
> +		.data = &sdhci_berlin2q_pdata,
> +	},
> +	{}

I think the hardware names should be used instead of the
quirks the hardware has (broken wp / broken adma)

Patch

diff --git a/drivers/mmc/host/Kconfig b/drivers/mmc/host/Kconfig
index 1384f67abe21..42db70031eb2 100644
--- a/drivers/mmc/host/Kconfig
+++ b/drivers/mmc/host/Kconfig
@@ -283,6 +283,17 @@  config MMC_SDHCI_BCM2835
 
 	  If unsure, say N.
 
+config MMC_SDHCI_BERLIN
+	tristate "Marvell Berlin SD/MMC Host Controller support"
+	depends on ARCH_BERLIN
+	depends on MMC_SDHCI_PLTFM
+	select MMC_SDHCI_IO_ACCESSORS
+	help
+	  This selects the Berlin SD/MMC controller. If you have a Berlin
+	  platform with SD or MMC devices, say Y or M here.
+
+	  If unsure, say N.
+
 config MMC_OMAP
 	tristate "TI OMAP Multimedia Card Interface support"
 	depends on ARCH_OMAP
diff --git a/drivers/mmc/host/Makefile b/drivers/mmc/host/Makefile
index 3483b6b6b880..b0256290530c 100644
--- a/drivers/mmc/host/Makefile
+++ b/drivers/mmc/host/Makefile
@@ -64,6 +64,7 @@  obj-$(CONFIG_MMC_SDHCI_OF_ESDHC)	+= sdhci-of-esdhc.o
 obj-$(CONFIG_MMC_SDHCI_OF_HLWD)		+= sdhci-of-hlwd.o
 obj-$(CONFIG_MMC_SDHCI_BCM_KONA)	+= sdhci-bcm-kona.o
 obj-$(CONFIG_MMC_SDHCI_BCM2835)		+= sdhci-bcm2835.o
+obj-$(CONFIG_MMC_SDHCI_BERLIN)		+= sdhci-berlin.o
 
 ifeq ($(CONFIG_CB710_DEBUG),y)
 	CFLAGS-cb710-mmc	+= -DDEBUG
diff --git a/drivers/mmc/host/sdhci-berlin.c b/drivers/mmc/host/sdhci-berlin.c
new file mode 100644
index 000000000000..ece8f7863937
--- /dev/null
+++ b/drivers/mmc/host/sdhci-berlin.c
@@ -0,0 +1,129 @@ 
+/*
+ * Marvell Berlin SDHCI driver
+ *
+ * Copyright (C) 2014 Marvell Technology Group Ltd.
+ *
+ * Antoine Ténart <antoine.tenart@free-electrons.com>
+ *
+ * This file is licensed under the terms of the GNU General Public
+ * License version 2. This program is licensed "as is" without any
+ * warranty of any kind, whether express or implied
+ */
+
+#include <linux/clk.h>
+#include <linux/err.h>
+#include <linux/io.h>
+#include <linux/mmc/host.h>
+#include <linux/module.h>
+#include <linux/of.h>
+#include <linux/of_device.h>
+
+#include "sdhci-pltfm.h"
+
+static struct sdhci_ops sdhci_berlin_ops = {
+	.get_max_clock = sdhci_pltfm_clk_get_max_clock,
+};
+
+static struct sdhci_pltfm_data sdhci_berlin2_pdata = {
+	.quirks	= SDHCI_QUIRK_CAP_CLOCK_BASE_BROKEN |
+		  SDHCI_QUIRK_BROKEN_ADMA |
+		  SDHCI_QUIRK_BROKEN_TIMEOUT_VAL,
+	.ops = &sdhci_berlin_ops,
+};
+
+static struct sdhci_pltfm_data sdhci_berlin2q_pdata = {
+	.quirks	= SDHCI_QUIRK_CAP_CLOCK_BASE_BROKEN |
+		  SDHCI_QUIRK_INVERTED_WRITE_PROTECT |
+		  SDHCI_QUIRK_BROKEN_TIMEOUT_VAL,
+	.ops = &sdhci_berlin_ops,
+};
+
+static const struct of_device_id sdhci_berlin_of_match_table[] = {
+	{
+		.compatible = "marvell,berlin2-sdhci",
+		.data = &sdhci_berlin2_pdata,
+	},
+	{
+		.compatible = "marvell,berlin2cd-sdhci",
+		.data = &sdhci_berlin2_pdata,
+	},
+	{
+		.compatible = "marvell,berlin2q-sdhci",
+		.data = &sdhci_berlin2q_pdata,
+	},
+	{}
+};
+MODULE_DEVICE_TABLE(of, sdhci_berlin_of_match_table);
+
+static int sdhci_berlin_probe(struct platform_device *pdev)
+{
+	struct device *dev = &pdev->dev;
+	struct sdhci_host *host;
+	struct sdhci_pltfm_host *pltfm_host;
+	struct clk *clk;
+	const struct of_device_id *device =
+		of_match_device(sdhci_berlin_of_match_table, dev);
+	int ret;
+
+	host = sdhci_pltfm_init(pdev,
+				(struct sdhci_pltfm_data *)device->data, 0);
+	if (IS_ERR(host))
+		return PTR_ERR(host);
+
+	pltfm_host = sdhci_priv(host);
+
+	clk = devm_clk_get(dev, NULL);
+	if (IS_ERR(clk)) {
+		dev_err(dev, "could not get clock: %ld\n", PTR_ERR(clk));
+		ret = PTR_ERR(clk);
+		goto err_clk_get;
+	}
+
+	clk_prepare_enable(clk);
+	pltfm_host->clk = clk;
+
+	sdhci_get_of_property(pdev);
+
+	if (host->quirks & SDHCI_QUIRK_BROKEN_CARD_DETECTION)
+		host->mmc->caps |= MMC_CAP_NONREMOVABLE;
+
+	ret = sdhci_add_host(host);
+	if (ret)
+		goto err_add_host;
+
+	return 0;
+
+err_add_host:
+	clk_disable_unprepare(pltfm_host->clk);
+err_clk_get:
+	sdhci_pltfm_free(pdev);
+
+	return ret;
+}
+
+static int sdhci_berlin_remove(struct platform_device *pdev)
+{
+	struct sdhci_host *host = platform_get_drvdata(pdev);
+	struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host);
+
+	sdhci_pltfm_unregister(pdev);
+	clk_disable_unprepare(pltfm_host->clk);
+
+	return 0;
+}
+
+static struct platform_driver sdhci_berlin_driver = {
+	.driver		= {
+		.name	= "berlin-sdhci",
+		.owner	= THIS_MODULE,
+		.pm	= SDHCI_PLTFM_PMOPS,
+		.of_match_table = sdhci_berlin_of_match_table,
+	},
+	.probe		= sdhci_berlin_probe,
+	.remove		= sdhci_berlin_remove,
+};
+module_platform_driver(sdhci_berlin_driver);
+
+MODULE_DESCRIPTION("SDHCI driver for Marvell Berlin SoC");
+MODULE_AUTHOR("Antoine Ténart <antoine.tenart@free-electrons.com>");
+MODULE_LICENSE("GPL");