diff mbox

[v6,1/7] phy: add a driver for the Berlin SATA PHY

Message ID 1402914392-6028-2-git-send-email-antoine.tenart@free-electrons.com
State New
Headers show

Commit Message

Antoine Tenart June 16, 2014, 10:26 a.m. UTC 
The Berlin SoC has a two SATA ports. Add a PHY driver to handle them.

The mode selection can let us think this PHY can be configured to fit
other purposes. But there are reasons to think the SATA mode will be
the only one usable: the PHY registers are only accessible indirectly
through two registers in the SATA range, the PHY seems to be integrated
and no information tells us the contrary. For these reasons, make the
driver a SATA PHY driver.

Signed-off-by: Antoine Ténart <antoine.tenart@free-electrons.com>
---
 drivers/phy/Kconfig           |   7 ++
 drivers/phy/Makefile          |   1 +
 drivers/phy/phy-berlin-sata.c | 232 ++++++++++++++++++++++++++++++++++++++++++
 3 files changed, 240 insertions(+)
 create mode 100644 drivers/phy/phy-berlin-sata.c

Comments

Sebastian Hesselbarth June 17, 2014, 6:17 p.m. UTC | #1 
On 06/16/2014 12:26 PM, Antoine Ténart wrote:
> The Berlin SoC has a two SATA ports. Add a PHY driver to handle them.
> 
> The mode selection can let us think this PHY can be configured to fit
> other purposes. But there are reasons to think the SATA mode will be
> the only one usable: the PHY registers are only accessible indirectly
> through two registers in the SATA range, the PHY seems to be integrated
> and no information tells us the contrary. For these reasons, make the
> driver a SATA PHY driver.
> 
> Signed-off-by: Antoine Ténart <antoine.tenart@free-electrons.com>
> ---
[...]
> diff --git a/drivers/phy/phy-berlin-sata.c b/drivers/phy/phy-berlin-sata.c
> new file mode 100644
> index 000000000000..907897a02672
> --- /dev/null
> +++ b/drivers/phy/phy-berlin-sata.c
> @@ -0,0 +1,232 @@
> +/*
> + * Marvell Berlin SATA PHY 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/module.h>
> +#include <linux/phy/phy.h>
> +#include <linux/io.h>
> +#include <linux/platform_device.h>
> +
> +#define HOST_VSA_ADDR		0x0
> +#define HOST_VSA_DATA		0x4
> +#define PORT_VSR_ADDR		0x78
> +#define PORT_VSR_DATA		0x7c
> +#define PORT_SCR_CTL		0x2c
> +
> +#define CONTROL_REGISTER	0x0
> +#define MBUS_SIZE_CONTROL	0x4
> +
> +#define POWER_DOWN_PHY0			BIT(6)
> +#define POWER_DOWN_PHY1			BIT(14)
> +#define MBUS_WRITE_REQUEST_SIZE_128	(BIT(2) << 16)
> +#define MBUS_READ_REQUEST_SIZE_128	(BIT(2) << 19)
> +
> +#define PHY_BASE		0x200

Antoine,

I gave your Berlin AHCI patches a try on BG2. I finally got it working
but BG2 has a different PHY_BASE and need some register fixups.

Please update this patch and the DT bindings to reflect the difference
of BG2Q with respect to BG2 as below.

[...]
> +
> +static const struct of_device_id phy_berlin_sata_of_match[] = {
> +	{ .compatible = "marvell,berlin-sata-phy" },

s/marvell,berlin-sata-phy/marvell,berlin2-sata-phy/

and add

marvell,berlin2q-sata-phy

That way it can be applied now without proper support for BG2
and I can send patches later.

Sebastian

> +	{ },
> +};
> +
> +static struct platform_driver phy_berlin_sata_driver = {
> +	.probe	= phy_berlin_sata_probe,
> +	.driver	= {
> +		.name		= "phy-berlin-sata",
> +		.owner		= THIS_MODULE,
> +		.of_match_table	= phy_berlin_sata_of_match,
> +	},
> +};
> +module_platform_driver(phy_berlin_sata_driver);
> +
> +MODULE_DESCRIPTION("Marvell Berlin SATA PHY driver");
> +MODULE_AUTHOR("Antoine Ténart <antoine.tenart@free-electrons.com>");
> +MODULE_LICENSE("GPL v2");
>
Antoine Tenart June 23, 2014, 1:05 p.m. UTC | #2 
Sebastian,

On Tue, Jun 17, 2014 at 08:17:02PM +0200, Sebastian Hesselbarth wrote:
> On 06/16/2014 12:26 PM, Antoine Ténart wrote:
> > +
> > +#define PHY_BASE		0x200
> 
> Antoine,
> 
> I gave your Berlin AHCI patches a try on BG2. I finally got it working
> but BG2 has a different PHY_BASE and need some register fixups.
> 
> Please update this patch and the DT bindings to reflect the difference
> of BG2Q with respect to BG2 as below.
> 
> [...]
> > +
> > +static const struct of_device_id phy_berlin_sata_of_match[] = {
> > +	{ .compatible = "marvell,berlin-sata-phy" },
> 
> s/marvell,berlin-sata-phy/marvell,berlin2-sata-phy/
> 
> and add
> 
> marvell,berlin2q-sata-phy
> 
> That way it can be applied now without proper support for BG2
> and I can send patches later.

Sure. I'll just s/marvell,berlin-sata-phy/marvell,berlin2q-sata-phy/ so
we don't have a non working compatible.

Antoine
Kishon Vijay Abraham I June 24, 2014, noon UTC | #3 
Hi,

On Monday 16 June 2014 03:56 PM, Antoine Ténart wrote:
> The Berlin SoC has a two SATA ports. Add a PHY driver to handle them.
> 
> The mode selection can let us think this PHY can be configured to fit
> other purposes. But there are reasons to think the SATA mode will be
> the only one usable: the PHY registers are only accessible indirectly
> through two registers in the SATA range, the PHY seems to be integrated
> and no information tells us the contrary. For these reasons, make the
> driver a SATA PHY driver.
> 
> Signed-off-by: Antoine Ténart <antoine.tenart@free-electrons.com>
> ---
>  drivers/phy/Kconfig           |   7 ++
>  drivers/phy/Makefile          |   1 +
>  drivers/phy/phy-berlin-sata.c | 232 ++++++++++++++++++++++++++++++++++++++++++
>  3 files changed, 240 insertions(+)
>  create mode 100644 drivers/phy/phy-berlin-sata.c
> 
> diff --git a/drivers/phy/Kconfig b/drivers/phy/Kconfig
> index 16a2f067c242..365ad3651e1c 100644
> --- a/drivers/phy/Kconfig
> +++ b/drivers/phy/Kconfig
> @@ -15,6 +15,13 @@ config GENERIC_PHY
>  	  phy users can obtain reference to the PHY. All the users of this
>  	  framework should select this config.
>  
> +config PHY_BERLIN_SATA
> +	tristate "Marvell Berlin SATA PHY driver"
> +	depends on ARCH_BERLIN && OF
> +	select GENERIC_PHY
> +	help
> +	  Enable this to support the SATA PHY on Marvell Berlin SoCs.
> +
>  config PHY_EXYNOS_MIPI_VIDEO
>  	tristate "S5P/EXYNOS SoC series MIPI CSI-2/DSI PHY driver"
>  	depends on HAS_IOMEM
> diff --git a/drivers/phy/Makefile b/drivers/phy/Makefile
> index b4f1d5770601..a137a2e23218 100644
> --- a/drivers/phy/Makefile
> +++ b/drivers/phy/Makefile
> @@ -3,6 +3,7 @@
>  #
>  
>  obj-$(CONFIG_GENERIC_PHY)		+= phy-core.o
> +obj-$(CONFIG_PHY_BERLIN_SATA)		+= phy-berlin-sata.o
>  obj-$(CONFIG_BCM_KONA_USB2_PHY)		+= phy-bcm-kona-usb2.o
>  obj-$(CONFIG_PHY_EXYNOS_DP_VIDEO)	+= phy-exynos-dp-video.o
>  obj-$(CONFIG_PHY_EXYNOS_MIPI_VIDEO)	+= phy-exynos-mipi-video.o
> diff --git a/drivers/phy/phy-berlin-sata.c b/drivers/phy/phy-berlin-sata.c
> new file mode 100644
> index 000000000000..907897a02672
> --- /dev/null
> +++ b/drivers/phy/phy-berlin-sata.c
> @@ -0,0 +1,232 @@
> +/*
> + * Marvell Berlin SATA PHY 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/module.h>
> +#include <linux/phy/phy.h>
> +#include <linux/io.h>
> +#include <linux/platform_device.h>
> +
> +#define HOST_VSA_ADDR		0x0
> +#define HOST_VSA_DATA		0x4
> +#define PORT_VSR_ADDR		0x78
> +#define PORT_VSR_DATA		0x7c
> +#define PORT_SCR_CTL		0x2c
> +
> +#define CONTROL_REGISTER	0x0
> +#define MBUS_SIZE_CONTROL	0x4
> +
> +#define POWER_DOWN_PHY0			BIT(6)
> +#define POWER_DOWN_PHY1			BIT(14)
> +#define MBUS_WRITE_REQUEST_SIZE_128	(BIT(2) << 16)
> +#define MBUS_READ_REQUEST_SIZE_128	(BIT(2) << 19)
> +
> +#define PHY_BASE		0x200
> +
> +/* register 0x01 */
> +#define REF_FREF_SEL_25		BIT(0)
> +#define PHY_MODE_SATA		(0x0 << 5)
> +
> +/* register 0x02 */
> +#define USE_MAX_PLL_RATE	BIT(12)
> +
> +/* register 0x23 */
> +#define DATA_BIT_WIDTH_10	(0x0 << 10)
> +#define DATA_BIT_WIDTH_20	(0x1 << 10)
> +#define DATA_BIT_WIDTH_40	(0x2 << 10)
> +
> +/* register 0x25 */
> +#define PHY_GEN_MAX_1_5		(0x0 << 10)
> +#define PHY_GEN_MAX_3_0		(0x1 << 10)
> +#define PHY_GEN_MAX_6_0		(0x2 << 10)
> +
> +#define BERLIN_SATA_PHY_NB	2

multi-phy PHY providers should be modelled so that each individual
PHY is made as sub-node of the PHY provider. Please refer [1] for the
discussion on this.

[1] -> https://lkml.org/lkml/2014/6/24/131

Thanks
Kishon
> +
> +#define to_berlin_sata_phy_priv(desc)	\
> +	container_of((desc), struct phy_berlin_priv, phys[(desc)->index])
> +
> +struct phy_berlin_desc {
> +	struct phy	*phy;
> +	u32		val;
> +	unsigned	index;
> +};
> +
> +struct phy_berlin_priv {
> +	void __iomem		*base;
> +	spinlock_t		lock;
> +	struct phy_berlin_desc	phys[BERLIN_SATA_PHY_NB];
> +};
> +
> +static inline void phy_berlin_sata_reg_setbits(void __iomem *ctrl_reg, u32 reg,
> +					       u32 mask, u32 val)
> +{
> +	u32 regval;
> +
> +	/* select register */
> +	writel(PHY_BASE + reg, ctrl_reg + PORT_VSR_ADDR);
> +
> +	/* set bits */
> +	regval = readl(ctrl_reg + PORT_VSR_DATA);
> +	regval &= ~mask;
> +	regval |= val;
> +	writel(regval, ctrl_reg + PORT_VSR_DATA);
> +}
> +
> +static int phy_berlin_sata_power_on(struct phy *phy)
> +{
> +	struct phy_berlin_desc *desc = phy_get_drvdata(phy);
> +	struct phy_berlin_priv *priv = to_berlin_sata_phy_priv(desc);
> +	void __iomem *ctrl_reg = priv->base + 0x60 + (desc->index * 0x80);
> +	int ret = 0;
> +	u32 regval;
> +
> +	spin_lock(&priv->lock);
> +
> +	/* Power on PHY */
> +	writel(CONTROL_REGISTER, priv->base + HOST_VSA_ADDR);
> +	regval = readl(priv->base + HOST_VSA_DATA);
> +	regval &= ~(desc->val);
> +	writel(regval, priv->base + HOST_VSA_DATA);
> +
> +	/* Configure MBus */
> +	writel(MBUS_SIZE_CONTROL, priv->base + HOST_VSA_ADDR);
> +	regval = readl(priv->base + HOST_VSA_DATA);
> +	regval |= MBUS_WRITE_REQUEST_SIZE_128 | MBUS_READ_REQUEST_SIZE_128;
> +	writel(regval, priv->base + HOST_VSA_DATA);
> +
> +	/* set PHY mode and ref freq to 25 MHz */
> +	phy_berlin_sata_reg_setbits(ctrl_reg, 0x1, 0xff,
> +				    REF_FREF_SEL_25 | PHY_MODE_SATA);
> +
> +	/* set PHY up to 6 Gbps */
> +	phy_berlin_sata_reg_setbits(ctrl_reg, 0x25, 0xc00, PHY_GEN_MAX_6_0);
> +
> +	/* set 40 bits width */
> +	phy_berlin_sata_reg_setbits(ctrl_reg, 0x23,  0xc00, DATA_BIT_WIDTH_40);
> +
> +	/* use max pll rate */
> +	phy_berlin_sata_reg_setbits(ctrl_reg, 0x2, 0x0, USE_MAX_PLL_RATE);
> +
> +	/* set the controller speed */
> +	writel(0x31, ctrl_reg + PORT_SCR_CTL);
> +
> +	spin_unlock(&priv->lock);
> +
> +	return ret;
> +}
> +
> +static int phy_berlin_sata_power_off(struct phy *phy)
> +{
> +	struct phy_berlin_desc *desc = phy_get_drvdata(phy);
> +	struct phy_berlin_priv *priv = to_berlin_sata_phy_priv(desc);
> +	u32 regval;
> +
> +	spin_lock(&priv->lock);
> +
> +	/* Power down PHY */
> +	writel(CONTROL_REGISTER, priv->base + HOST_VSA_ADDR);
> +	regval = readl(priv->base + HOST_VSA_DATA);
> +	regval |= desc->val;
> +	writel(regval, priv->base + HOST_VSA_DATA);
> +
> +	spin_unlock(&priv->lock);
> +
> +	return 0;
> +}
> +
> +static struct phy *phy_berlin_sata_phy_xlate(struct device *dev,
> +					     struct of_phandle_args *args)
> +{
> +	struct phy_berlin_priv *priv = dev_get_drvdata(dev);
> +
> +	if (WARN_ON(args->args[0] >= BERLIN_SATA_PHY_NB))
> +		return ERR_PTR(-ENODEV);
> +
> +	return priv->phys[args->args[0]].phy;
> +}
> +
> +static struct phy_ops phy_berlin_sata_ops = {
> +	.power_on	= phy_berlin_sata_power_on,
> +	.power_off	= phy_berlin_sata_power_off,
> +	.owner		= THIS_MODULE,
> +};
> +
> +static u32 phy_berlin_power_down_bits[] = {
> +	POWER_DOWN_PHY0,
> +	POWER_DOWN_PHY1,
> +};
> +
> +static int phy_berlin_sata_probe(struct platform_device *pdev)
> +{
> +	struct device *dev = &pdev->dev;
> +	struct phy *phy;
> +	struct phy_provider *phy_provider;
> +	struct phy_berlin_priv *priv;
> +	struct resource *res;
> +	int i;
> +
> +	priv = devm_kzalloc(dev, sizeof(*priv), GFP_KERNEL);
> +	if (!priv)
> +		return -ENOMEM;
> +
> +	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
> +	if (!res)
> +		return -EINVAL;
> +
> +	priv->base = devm_ioremap(dev, res->start, resource_size(res));
> +	if (!priv->base)
> +		return -ENOMEM;
> +
> +	dev_set_drvdata(dev, priv);
> +	spin_lock_init(&priv->lock);
> +
> +	for (i = 0; i < BERLIN_SATA_PHY_NB; i++) {
> +		phy = devm_phy_create(dev, &phy_berlin_sata_ops, NULL);
> +		if (IS_ERR(phy)) {
> +			dev_err(dev, "failed to create PHY %d\n", i);
> +			return PTR_ERR(phy);
> +		}
> +
> +		priv->phys[i].phy = phy;
> +		priv->phys[i].val = phy_berlin_power_down_bits[i];
> +		priv->phys[i].index = i;
> +		phy_set_drvdata(phy, &priv->phys[i]);
> +
> +		/* Make sure the PHY is off */
> +		phy_berlin_sata_power_off(phy);
> +	}
> +
> +	phy_provider =
> +		devm_of_phy_provider_register(dev, phy_berlin_sata_phy_xlate);
> +	if (IS_ERR(phy_provider))
> +		return PTR_ERR(phy_provider);
> +
> +	return 0;
> +}
> +
> +static const struct of_device_id phy_berlin_sata_of_match[] = {
> +	{ .compatible = "marvell,berlin-sata-phy" },
> +	{ },
> +};
> +
> +static struct platform_driver phy_berlin_sata_driver = {
> +	.probe	= phy_berlin_sata_probe,
> +	.driver	= {
> +		.name		= "phy-berlin-sata",
> +		.owner		= THIS_MODULE,
> +		.of_match_table	= phy_berlin_sata_of_match,
> +	},
> +};
> +module_platform_driver(phy_berlin_sata_driver);
> +
> +MODULE_DESCRIPTION("Marvell Berlin SATA PHY driver");
> +MODULE_AUTHOR("Antoine Ténart <antoine.tenart@free-electrons.com>");
> +MODULE_LICENSE("GPL v2");
>
Varka Bhadram June 24, 2014, 12:07 p.m. UTC | #4 
On 06/24/2014 05:30 PM, Kishon Vijay Abraham I wrote:
> Hi,
>
> On Monday 16 June 2014 03:56 PM, Antoine Ténart wrote:
>> The Berlin SoC has a two SATA ports. Add a PHY driver to handle them.
>>
>> The mode selection can let us think this PHY can be configured to fit
>> other purposes. But there are reasons to think the SATA mode will be
>> the only one usable: the PHY registers are only accessible indirectly
>> through two registers in the SATA range, the PHY seems to be integrated
>> and no information tells us the contrary. For these reasons, make the
>> driver a SATA PHY driver.
>>
>> Signed-off-by: Antoine Ténart <antoine.tenart@free-electrons.com>
>> ---
>>   drivers/phy/Kconfig           |   7 ++
>>   drivers/phy/Makefile          |   1 +
>>   drivers/phy/phy-berlin-sata.c | 232 ++++++++++++++++++++++++++++++++++++++++++
>>   3 files changed, 240 insertions(+)
>>   create mode 100644 drivers/phy/phy-berlin-sata.c
>>
>> diff --git a/drivers/phy/Kconfig b/drivers/phy/Kconfig
>> index 16a2f067c242..365ad3651e1c 100644
>> --- a/drivers/phy/Kconfig
>> +++ b/drivers/phy/Kconfig
>> @@ -15,6 +15,13 @@ config GENERIC_PHY
>>   	  phy users can obtain reference to the PHY. All the users of this
>>   	  framework should select this config.
>>   
>> +config PHY_BERLIN_SATA
>> +	tristate "Marvell Berlin SATA PHY driver"
>> +	depends on ARCH_BERLIN && OF
>> +	select GENERIC_PHY
>> +	help
>> +	  Enable this to support the SATA PHY on Marvell Berlin SoCs.
>> +
>>   config PHY_EXYNOS_MIPI_VIDEO
>>   	tristate "S5P/EXYNOS SoC series MIPI CSI-2/DSI PHY driver"
>>   	depends on HAS_IOMEM
>> diff --git a/drivers/phy/Makefile b/drivers/phy/Makefile
>> index b4f1d5770601..a137a2e23218 100644
>> --- a/drivers/phy/Makefile
>> +++ b/drivers/phy/Makefile
>> @@ -3,6 +3,7 @@
>>   #
>>   
>>   obj-$(CONFIG_GENERIC_PHY)		+= phy-core.o
>> +obj-$(CONFIG_PHY_BERLIN_SATA)		+= phy-berlin-sata.o
>>   obj-$(CONFIG_BCM_KONA_USB2_PHY)		+= phy-bcm-kona-usb2.o
>>   obj-$(CONFIG_PHY_EXYNOS_DP_VIDEO)	+= phy-exynos-dp-video.o
>>   obj-$(CONFIG_PHY_EXYNOS_MIPI_VIDEO)	+= phy-exynos-mipi-video.o
>> diff --git a/drivers/phy/phy-berlin-sata.c b/drivers/phy/phy-berlin-sata.c
>> new file mode 100644
>> index 000000000000..907897a02672
>> --- /dev/null
>> +++ b/drivers/phy/phy-berlin-sata.c
>> @@ -0,0 +1,232 @@
>> +/*
>> + * Marvell Berlin SATA PHY 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/module.h>
>> +#include <linux/phy/phy.h>
>> +#include <linux/io.h>
>> +#include <linux/platform_device.h>
>> +
>> +#define HOST_VSA_ADDR		0x0
>> +#define HOST_VSA_DATA		0x4
>> +#define PORT_VSR_ADDR		0x78
>> +#define PORT_VSR_DATA		0x7c
>> +#define PORT_SCR_CTL		0x2c
>> +
>> +#define CONTROL_REGISTER	0x0
>> +#define MBUS_SIZE_CONTROL	0x4
>> +
>> +#define POWER_DOWN_PHY0			BIT(6)
>> +#define POWER_DOWN_PHY1			BIT(14)
>> +#define MBUS_WRITE_REQUEST_SIZE_128	(BIT(2) << 16)
>> +#define MBUS_READ_REQUEST_SIZE_128	(BIT(2) << 19)
>> +
>> +#define PHY_BASE		0x200
>> +
>> +/* register 0x01 */
>> +#define REF_FREF_SEL_25		BIT(0)
>> +#define PHY_MODE_SATA		(0x0 << 5)
>> +
>> +/* register 0x02 */
>> +#define USE_MAX_PLL_RATE	BIT(12)
>> +
>> +/* register 0x23 */
>> +#define DATA_BIT_WIDTH_10	(0x0 << 10)
>> +#define DATA_BIT_WIDTH_20	(0x1 << 10)
>> +#define DATA_BIT_WIDTH_40	(0x2 << 10)
>> +
>> +/* register 0x25 */
>> +#define PHY_GEN_MAX_1_5		(0x0 << 10)
>> +#define PHY_GEN_MAX_3_0		(0x1 << 10)
>> +#define PHY_GEN_MAX_6_0		(0x2 << 10)
>> +
>> +#define BERLIN_SATA_PHY_NB	2
> multi-phy PHY providers should be modelled so that each individual
> PHY is made as sub-node of the PHY provider. Please refer [1] for the
> discussion on this.
>
> [1] -> https://lkml.org/lkml/2014/6/24/131
>
> Thanks
> Kishon
>> +
>> +#define to_berlin_sata_phy_priv(desc)	\
>> +	container_of((desc), struct phy_berlin_priv, phys[(desc)->index])
>> +
>> +struct phy_berlin_desc {
>> +	struct phy	*phy;
>> +	u32		val;
>> +	unsigned	index;
>> +};
>> +
>> +struct phy_berlin_priv {
>> +	void __iomem		*base;
>> +	spinlock_t		lock;
>> +	struct phy_berlin_desc	phys[BERLIN_SATA_PHY_NB];
>> +};
>> +
>> +static inline void phy_berlin_sata_reg_setbits(void __iomem *ctrl_reg, u32 reg,
>> +					       u32 mask, u32 val)
>> +{
>> +	u32 regval;
>> +
>> +	/* select register */
>> +	writel(PHY_BASE + reg, ctrl_reg + PORT_VSR_ADDR);
>> +
>> +	/* set bits */
>> +	regval = readl(ctrl_reg + PORT_VSR_DATA);
>> +	regval &= ~mask;
>> +	regval |= val;
>> +	writel(regval, ctrl_reg + PORT_VSR_DATA);
>> +}
>> +
>> +static int phy_berlin_sata_power_on(struct phy *phy)
>> +{
>> +	struct phy_berlin_desc *desc = phy_get_drvdata(phy);
>> +	struct phy_berlin_priv *priv = to_berlin_sata_phy_priv(desc);
>> +	void __iomem *ctrl_reg = priv->base + 0x60 + (desc->index * 0x80);
>> +	int ret = 0;
>> +	u32 regval;
>> +
>> +	spin_lock(&priv->lock);
>> +
>> +	/* Power on PHY */
>> +	writel(CONTROL_REGISTER, priv->base + HOST_VSA_ADDR);
>> +	regval = readl(priv->base + HOST_VSA_DATA);
>> +	regval &= ~(desc->val);
>> +	writel(regval, priv->base + HOST_VSA_DATA);
>> +
>> +	/* Configure MBus */
>> +	writel(MBUS_SIZE_CONTROL, priv->base + HOST_VSA_ADDR);
>> +	regval = readl(priv->base + HOST_VSA_DATA);
>> +	regval |= MBUS_WRITE_REQUEST_SIZE_128 | MBUS_READ_REQUEST_SIZE_128;
>> +	writel(regval, priv->base + HOST_VSA_DATA);
>> +
>> +	/* set PHY mode and ref freq to 25 MHz */
>> +	phy_berlin_sata_reg_setbits(ctrl_reg, 0x1, 0xff,
>> +				    REF_FREF_SEL_25 | PHY_MODE_SATA);
>> +
>> +	/* set PHY up to 6 Gbps */
>> +	phy_berlin_sata_reg_setbits(ctrl_reg, 0x25, 0xc00, PHY_GEN_MAX_6_0);
>> +
>> +	/* set 40 bits width */
>> +	phy_berlin_sata_reg_setbits(ctrl_reg, 0x23,  0xc00, DATA_BIT_WIDTH_40);
>> +
>> +	/* use max pll rate */
>> +	phy_berlin_sata_reg_setbits(ctrl_reg, 0x2, 0x0, USE_MAX_PLL_RATE);
>> +
>> +	/* set the controller speed */
>> +	writel(0x31, ctrl_reg + PORT_SCR_CTL);
>> +
>> +	spin_unlock(&priv->lock);
>> +
>> +	return ret;
>> +}
>> +
>> +static int phy_berlin_sata_power_off(struct phy *phy)
>> +{
>> +	struct phy_berlin_desc *desc = phy_get_drvdata(phy);
>> +	struct phy_berlin_priv *priv = to_berlin_sata_phy_priv(desc);
>> +	u32 regval;
>> +
>> +	spin_lock(&priv->lock);
>> +
>> +	/* Power down PHY */
>> +	writel(CONTROL_REGISTER, priv->base + HOST_VSA_ADDR);
>> +	regval = readl(priv->base + HOST_VSA_DATA);
>> +	regval |= desc->val;
>> +	writel(regval, priv->base + HOST_VSA_DATA);
>> +
>> +	spin_unlock(&priv->lock);
>> +
>> +	return 0;
>> +}
>> +
>> +static struct phy *phy_berlin_sata_phy_xlate(struct device *dev,
>> +					     struct of_phandle_args *args)

Indent the function properly like this:
static struct phy *phy_berlin_sata_phy_xlate(struct device *dev,
					     struct of_phandle_args *args)

check with checkpatch.pl script

>> +{
>> +	struct phy_berlin_priv *priv = dev_get_drvdata(dev);
>> +
>> +	if (WARN_ON(args->args[0] >= BERLIN_SATA_PHY_NB))
>> +		return ERR_PTR(-ENODEV);
>> +
>> +	return priv->phys[args->args[0]].phy;
>> +}
>> +
>> +static struct phy_ops phy_berlin_sata_ops = {
>> +	.power_on	= phy_berlin_sata_power_on,
>> +	.power_off	= phy_berlin_sata_power_off,
>> +	.owner		= THIS_MODULE,
>> +};
>> +
>> +static u32 phy_berlin_power_down_bits[] = {
>> +	POWER_DOWN_PHY0,
>> +	POWER_DOWN_PHY1,
>> +};
>> +
>> +static int phy_berlin_sata_probe(struct platform_device *pdev)
>> +{
>> +	struct device *dev = &pdev->dev;
>> +	struct phy *phy;
>> +	struct phy_provider *phy_provider;
>> +	struct phy_berlin_priv *priv;
>> +	struct resource *res;
>> +	int i;
>> +
>> +	priv = devm_kzalloc(dev, sizeof(*priv), GFP_KERNEL);
>> +	if (!priv)
>> +		return -ENOMEM;
>> +
>> +	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
>> +	if (!res)
>> +		return -EINVAL;
>> +
>> +	priv->base = devm_ioremap(dev, res->start, resource_size(res));
>> +	if (!priv->base)
>> +		return -ENOMEM;
>> +
>> +	dev_set_drvdata(dev, priv);
>> +	spin_lock_init(&priv->lock);
>> +
>> +	for (i = 0; i < BERLIN_SATA_PHY_NB; i++) {
>> +		phy = devm_phy_create(dev, &phy_berlin_sata_ops, NULL);
>> +		if (IS_ERR(phy)) {
>> +			dev_err(dev, "failed to create PHY %d\n", i);
>> +			return PTR_ERR(phy);
>> +		}
>> +
>> +		priv->phys[i].phy = phy;
>> +		priv->phys[i].val = phy_berlin_power_down_bits[i];
>> +		priv->phys[i].index = i;
>> +		phy_set_drvdata(phy, &priv->phys[i]);
>> +
>> +		/* Make sure the PHY is off */
>> +		phy_berlin_sata_power_off(phy);
>> +	}
>> +
>> +	phy_provider =
>> +		devm_of_phy_provider_register(dev, phy_berlin_sata_phy_xlate);
>> +	if (IS_ERR(phy_provider))
>> +		return PTR_ERR(phy_provider);
>> +
>> +	return 0;
>> +}
>> +
>> +static const struct of_device_id phy_berlin_sata_of_match[] = {
>> +	{ .compatible = "marvell,berlin-sata-phy" },
>> +	{ },
>> +};
>> +
>> +static struct platform_driver phy_berlin_sata_driver = {
>> +	.probe	= phy_berlin_sata_probe,
>> +	.driver	= {
>> +		.name		= "phy-berlin-sata",
>> +		.owner		= THIS_MODULE,
>> +		.of_match_table	= phy_berlin_sata_of_match,

use of_match_ptr for of_match_table

>> +	},
>> +};
>> +module_platform_driver(phy_berlin_sata_driver);
>> +
>> +MODULE_DESCRIPTION("Marvell Berlin SATA PHY driver");
>> +MODULE_AUTHOR("Antoine Ténart <antoine.tenart@free-electrons.com>");
>> +MODULE_LICENSE("GPL v2");
>>
> --
> To unsubscribe from this list: send the line "unsubscribe devicetree" in
> the body of a message to majordomo@vger.kernel.org
> More majordomo info at  http://vger.kernel.org/majordomo-info.html
Lee Jones June 24, 2014, 12:15 p.m. UTC | #5 
On Tue, 24 Jun 2014, Varka Bhadram wrote:
> On 06/24/2014 05:30 PM, Kishon Vijay Abraham I wrote:
> >On Monday 16 June 2014 03:56 PM, Antoine Ténart wrote:
> >>The Berlin SoC has a two SATA ports. Add a PHY driver to handle them.
> >>
> >>The mode selection can let us think this PHY can be configured to fit
> >>other purposes. But there are reasons to think the SATA mode will be
> >>the only one usable: the PHY registers are only accessible indirectly
> >>through two registers in the SATA range, the PHY seems to be integrated
> >>and no information tells us the contrary. For these reasons, make the
> >>driver a SATA PHY driver.
> >>
> >>Signed-off-by: Antoine Ténart <antoine.tenart@free-electrons.com>
> >>---
> >>  drivers/phy/Kconfig           |   7 ++
> >>  drivers/phy/Makefile          |   1 +
> >>  drivers/phy/phy-berlin-sata.c | 232 ++++++++++++++++++++++++++++++++++++++++++
> >>  3 files changed, 240 insertions(+)
> >>  create mode 100644 drivers/phy/phy-berlin-sata.c

Please snip all unseccersary code when replying to patches.

[...]

> >>+static struct phy *phy_berlin_sata_phy_xlate(struct device *dev,
> >>+					     struct of_phandle_args *args)
> 
> Indent the function properly like this:
> static struct phy *phy_berlin_sata_phy_xlate(struct device *dev,
> 					     struct of_phandle_args *args)

You can also indent with TABs, especially if it means the following
line(s) would wrap.

> check with checkpatch.pl script

Snippy, snippy.

[...]

> >>+static struct platform_driver phy_berlin_sata_driver = {
> >>+	.probe	= phy_berlin_sata_probe,
> >>+	.driver	= {
> >>+		.name		= "phy-berlin-sata",
> >>+		.owner		= THIS_MODULE,
> >>+		.of_match_table	= phy_berlin_sata_of_match,
> 
> use of_match_ptr for of_match_table

What use is this?

[...]
Varka Bhadram June 24, 2014, 12:22 p.m. UTC | #6 
On 06/24/2014 05:45 PM, Lee Jones wrote:
> On Tue, 24 Jun 2014, Varka Bhadram wrote:
>> On 06/24/2014 05:30 PM, Kishon Vijay Abraham I wrote:
>>> On Monday 16 June 2014 03:56 PM, Antoine Ténart wrote:
>>>> The Berlin SoC has a two SATA ports. Add a PHY driver to handle them.
>>>>
>>>> The mode selection can let us think this PHY can be configured to fit
>>>> other purposes. But there are reasons to think the SATA mode will be
>>>> the only one usable: the PHY registers are only accessible indirectly
>>>> through two registers in the SATA range, the PHY seems to be integrated
>>>> and no information tells us the contrary. For these reasons, make the
>>>> driver a SATA PHY driver.
>>>>
>>>> Signed-off-by: Antoine Ténart <antoine.tenart@free-electrons.com>
>>>> ---
>>>>   drivers/phy/Kconfig           |   7 ++
>>>>   drivers/phy/Makefile          |   1 +
>>>>   drivers/phy/phy-berlin-sata.c | 232 ++++++++++++++++++++++++++++++++++++++++++
>>>>   3 files changed, 240 insertions(+)
>>>>   create mode 100644 drivers/phy/phy-berlin-sata.c

[...]

>>>> +static struct platform_driver phy_berlin_sata_driver = {
>>>> +	.probe	= phy_berlin_sata_probe,
>>>> +	.driver	= {
>>>> +		.name		= "phy-berlin-sata",
>>>> +		.owner		= THIS_MODULE,
>>>> +		.of_match_table	= phy_berlin_sata_of_match,
>> use of_match_ptr for of_match_table
> What use is this?
>
> [...]
>
of_match_table is NULL for Non-DT based. Better to use the of_match_ptr().
If driver is DT based 'of_match_table	= phy_berlin_sata_of_match'
else 'of_match_table	= NULL'

This is take care by of_match_ptr() macro.

Thanks,
Varka Bhadram
Lee Jones June 24, 2014, 12:39 p.m. UTC | #7 
On Tue, 24 Jun 2014, Varka Bhadram wrote:

> On 06/24/2014 05:45 PM, Lee Jones wrote:
> >On Tue, 24 Jun 2014, Varka Bhadram wrote:
> >>On 06/24/2014 05:30 PM, Kishon Vijay Abraham I wrote:
> >>>On Monday 16 June 2014 03:56 PM, Antoine Ténart wrote:
> >>>>The Berlin SoC has a two SATA ports. Add a PHY driver to handle them.
> >>>>
> >>>>The mode selection can let us think this PHY can be configured to fit
> >>>>other purposes. But there are reasons to think the SATA mode will be
> >>>>the only one usable: the PHY registers are only accessible indirectly
> >>>>through two registers in the SATA range, the PHY seems to be integrated
> >>>>and no information tells us the contrary. For these reasons, make the
> >>>>driver a SATA PHY driver.
> >>>>
> >>>>Signed-off-by: Antoine Ténart <antoine.tenart@free-electrons.com>
> >>>>---
> >>>>  drivers/phy/Kconfig           |   7 ++
> >>>>  drivers/phy/Makefile          |   1 +
> >>>>  drivers/phy/phy-berlin-sata.c | 232 ++++++++++++++++++++++++++++++++++++++++++
> >>>>  3 files changed, 240 insertions(+)
> >>>>  create mode 100644 drivers/phy/phy-berlin-sata.c
> 
> [...]
> 
> >>>>+static struct platform_driver phy_berlin_sata_driver = {
> >>>>+	.probe	= phy_berlin_sata_probe,
> >>>>+	.driver	= {
> >>>>+		.name		= "phy-berlin-sata",
> >>>>+		.owner		= THIS_MODULE,
> >>>>+		.of_match_table	= phy_berlin_sata_of_match,
> >>use of_match_ptr for of_match_table
> >What use is this?
> >
> >[...]
> >
> of_match_table is NULL for Non-DT based. Better to use the of_match_ptr().
> If driver is DT based 'of_match_table	= phy_berlin_sata_of_match'
> else 'of_match_table	= NULL'
> 
> This is take care by of_match_ptr() macro.

This driver 'depends on OF', so it's okay to always populate
.of_match_table.
Antoine Tenart June 30, 2014, 10:20 a.m. UTC | #8 
Hello,

On Tue, Jun 24, 2014 at 05:37:56PM +0530, Varka Bhadram wrote:
> On 06/24/2014 05:30 PM, Kishon Vijay Abraham I wrote:
> >On Monday 16 June 2014 03:56 PM, Antoine Ténart wrote:
> >>+
> >>+static struct phy *phy_berlin_sata_phy_xlate(struct device *dev,
> >>+					     struct of_phandle_args *args)
> 
> Indent the function properly like this:
> static struct phy *phy_berlin_sata_phy_xlate(struct device *dev,
> 					     struct of_phandle_args *args)
> 
> check with checkpatch.pl script

Already fixed in v7.


Antoine
diff mbox

Patch

diff --git a/drivers/phy/Kconfig b/drivers/phy/Kconfig
index 16a2f067c242..365ad3651e1c 100644
--- a/drivers/phy/Kconfig
+++ b/drivers/phy/Kconfig
@@ -15,6 +15,13 @@  config GENERIC_PHY
 	  phy users can obtain reference to the PHY. All the users of this
 	  framework should select this config.
 
+config PHY_BERLIN_SATA
+	tristate "Marvell Berlin SATA PHY driver"
+	depends on ARCH_BERLIN && OF
+	select GENERIC_PHY
+	help
+	  Enable this to support the SATA PHY on Marvell Berlin SoCs.
+
 config PHY_EXYNOS_MIPI_VIDEO
 	tristate "S5P/EXYNOS SoC series MIPI CSI-2/DSI PHY driver"
 	depends on HAS_IOMEM
diff --git a/drivers/phy/Makefile b/drivers/phy/Makefile
index b4f1d5770601..a137a2e23218 100644
--- a/drivers/phy/Makefile
+++ b/drivers/phy/Makefile
@@ -3,6 +3,7 @@ 
 #
 
 obj-$(CONFIG_GENERIC_PHY)		+= phy-core.o
+obj-$(CONFIG_PHY_BERLIN_SATA)		+= phy-berlin-sata.o
 obj-$(CONFIG_BCM_KONA_USB2_PHY)		+= phy-bcm-kona-usb2.o
 obj-$(CONFIG_PHY_EXYNOS_DP_VIDEO)	+= phy-exynos-dp-video.o
 obj-$(CONFIG_PHY_EXYNOS_MIPI_VIDEO)	+= phy-exynos-mipi-video.o
diff --git a/drivers/phy/phy-berlin-sata.c b/drivers/phy/phy-berlin-sata.c
new file mode 100644
index 000000000000..907897a02672
--- /dev/null
+++ b/drivers/phy/phy-berlin-sata.c
@@ -0,0 +1,232 @@ 
+/*
+ * Marvell Berlin SATA PHY 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/module.h>
+#include <linux/phy/phy.h>
+#include <linux/io.h>
+#include <linux/platform_device.h>
+
+#define HOST_VSA_ADDR		0x0
+#define HOST_VSA_DATA		0x4
+#define PORT_VSR_ADDR		0x78
+#define PORT_VSR_DATA		0x7c
+#define PORT_SCR_CTL		0x2c
+
+#define CONTROL_REGISTER	0x0
+#define MBUS_SIZE_CONTROL	0x4
+
+#define POWER_DOWN_PHY0			BIT(6)
+#define POWER_DOWN_PHY1			BIT(14)
+#define MBUS_WRITE_REQUEST_SIZE_128	(BIT(2) << 16)
+#define MBUS_READ_REQUEST_SIZE_128	(BIT(2) << 19)
+
+#define PHY_BASE		0x200
+
+/* register 0x01 */
+#define REF_FREF_SEL_25		BIT(0)
+#define PHY_MODE_SATA		(0x0 << 5)
+
+/* register 0x02 */
+#define USE_MAX_PLL_RATE	BIT(12)
+
+/* register 0x23 */
+#define DATA_BIT_WIDTH_10	(0x0 << 10)
+#define DATA_BIT_WIDTH_20	(0x1 << 10)
+#define DATA_BIT_WIDTH_40	(0x2 << 10)
+
+/* register 0x25 */
+#define PHY_GEN_MAX_1_5		(0x0 << 10)
+#define PHY_GEN_MAX_3_0		(0x1 << 10)
+#define PHY_GEN_MAX_6_0		(0x2 << 10)
+
+#define BERLIN_SATA_PHY_NB	2
+
+#define to_berlin_sata_phy_priv(desc)	\
+	container_of((desc), struct phy_berlin_priv, phys[(desc)->index])
+
+struct phy_berlin_desc {
+	struct phy	*phy;
+	u32		val;
+	unsigned	index;
+};
+
+struct phy_berlin_priv {
+	void __iomem		*base;
+	spinlock_t		lock;
+	struct phy_berlin_desc	phys[BERLIN_SATA_PHY_NB];
+};
+
+static inline void phy_berlin_sata_reg_setbits(void __iomem *ctrl_reg, u32 reg,
+					       u32 mask, u32 val)
+{
+	u32 regval;
+
+	/* select register */
+	writel(PHY_BASE + reg, ctrl_reg + PORT_VSR_ADDR);
+
+	/* set bits */
+	regval = readl(ctrl_reg + PORT_VSR_DATA);
+	regval &= ~mask;
+	regval |= val;
+	writel(regval, ctrl_reg + PORT_VSR_DATA);
+}
+
+static int phy_berlin_sata_power_on(struct phy *phy)
+{
+	struct phy_berlin_desc *desc = phy_get_drvdata(phy);
+	struct phy_berlin_priv *priv = to_berlin_sata_phy_priv(desc);
+	void __iomem *ctrl_reg = priv->base + 0x60 + (desc->index * 0x80);
+	int ret = 0;
+	u32 regval;
+
+	spin_lock(&priv->lock);
+
+	/* Power on PHY */
+	writel(CONTROL_REGISTER, priv->base + HOST_VSA_ADDR);
+	regval = readl(priv->base + HOST_VSA_DATA);
+	regval &= ~(desc->val);
+	writel(regval, priv->base + HOST_VSA_DATA);
+
+	/* Configure MBus */
+	writel(MBUS_SIZE_CONTROL, priv->base + HOST_VSA_ADDR);
+	regval = readl(priv->base + HOST_VSA_DATA);
+	regval |= MBUS_WRITE_REQUEST_SIZE_128 | MBUS_READ_REQUEST_SIZE_128;
+	writel(regval, priv->base + HOST_VSA_DATA);
+
+	/* set PHY mode and ref freq to 25 MHz */
+	phy_berlin_sata_reg_setbits(ctrl_reg, 0x1, 0xff,
+				    REF_FREF_SEL_25 | PHY_MODE_SATA);
+
+	/* set PHY up to 6 Gbps */
+	phy_berlin_sata_reg_setbits(ctrl_reg, 0x25, 0xc00, PHY_GEN_MAX_6_0);
+
+	/* set 40 bits width */
+	phy_berlin_sata_reg_setbits(ctrl_reg, 0x23,  0xc00, DATA_BIT_WIDTH_40);
+
+	/* use max pll rate */
+	phy_berlin_sata_reg_setbits(ctrl_reg, 0x2, 0x0, USE_MAX_PLL_RATE);
+
+	/* set the controller speed */
+	writel(0x31, ctrl_reg + PORT_SCR_CTL);
+
+	spin_unlock(&priv->lock);
+
+	return ret;
+}
+
+static int phy_berlin_sata_power_off(struct phy *phy)
+{
+	struct phy_berlin_desc *desc = phy_get_drvdata(phy);
+	struct phy_berlin_priv *priv = to_berlin_sata_phy_priv(desc);
+	u32 regval;
+
+	spin_lock(&priv->lock);
+
+	/* Power down PHY */
+	writel(CONTROL_REGISTER, priv->base + HOST_VSA_ADDR);
+	regval = readl(priv->base + HOST_VSA_DATA);
+	regval |= desc->val;
+	writel(regval, priv->base + HOST_VSA_DATA);
+
+	spin_unlock(&priv->lock);
+
+	return 0;
+}
+
+static struct phy *phy_berlin_sata_phy_xlate(struct device *dev,
+					     struct of_phandle_args *args)
+{
+	struct phy_berlin_priv *priv = dev_get_drvdata(dev);
+
+	if (WARN_ON(args->args[0] >= BERLIN_SATA_PHY_NB))
+		return ERR_PTR(-ENODEV);
+
+	return priv->phys[args->args[0]].phy;
+}
+
+static struct phy_ops phy_berlin_sata_ops = {
+	.power_on	= phy_berlin_sata_power_on,
+	.power_off	= phy_berlin_sata_power_off,
+	.owner		= THIS_MODULE,
+};
+
+static u32 phy_berlin_power_down_bits[] = {
+	POWER_DOWN_PHY0,
+	POWER_DOWN_PHY1,
+};
+
+static int phy_berlin_sata_probe(struct platform_device *pdev)
+{
+	struct device *dev = &pdev->dev;
+	struct phy *phy;
+	struct phy_provider *phy_provider;
+	struct phy_berlin_priv *priv;
+	struct resource *res;
+	int i;
+
+	priv = devm_kzalloc(dev, sizeof(*priv), GFP_KERNEL);
+	if (!priv)
+		return -ENOMEM;
+
+	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+	if (!res)
+		return -EINVAL;
+
+	priv->base = devm_ioremap(dev, res->start, resource_size(res));
+	if (!priv->base)
+		return -ENOMEM;
+
+	dev_set_drvdata(dev, priv);
+	spin_lock_init(&priv->lock);
+
+	for (i = 0; i < BERLIN_SATA_PHY_NB; i++) {
+		phy = devm_phy_create(dev, &phy_berlin_sata_ops, NULL);
+		if (IS_ERR(phy)) {
+			dev_err(dev, "failed to create PHY %d\n", i);
+			return PTR_ERR(phy);
+		}
+
+		priv->phys[i].phy = phy;
+		priv->phys[i].val = phy_berlin_power_down_bits[i];
+		priv->phys[i].index = i;
+		phy_set_drvdata(phy, &priv->phys[i]);
+
+		/* Make sure the PHY is off */
+		phy_berlin_sata_power_off(phy);
+	}
+
+	phy_provider =
+		devm_of_phy_provider_register(dev, phy_berlin_sata_phy_xlate);
+	if (IS_ERR(phy_provider))
+		return PTR_ERR(phy_provider);
+
+	return 0;
+}
+
+static const struct of_device_id phy_berlin_sata_of_match[] = {
+	{ .compatible = "marvell,berlin-sata-phy" },
+	{ },
+};
+
+static struct platform_driver phy_berlin_sata_driver = {
+	.probe	= phy_berlin_sata_probe,
+	.driver	= {
+		.name		= "phy-berlin-sata",
+		.owner		= THIS_MODULE,
+		.of_match_table	= phy_berlin_sata_of_match,
+	},
+};
+module_platform_driver(phy_berlin_sata_driver);
+
+MODULE_DESCRIPTION("Marvell Berlin SATA PHY driver");
+MODULE_AUTHOR("Antoine Ténart <antoine.tenart@free-electrons.com>");
+MODULE_LICENSE("GPL v2");