[PATCH] usb: phy: samsung: Add support to set pmu isolation

[PATCH] usb: phy: samsung: Add support to set pmu isolation

[Vivek Gautam]

Adding support to parse device node data in order to get
required properties to set pmu isolation for usb-phy.

Signed-off-by: Vivek Gautam <gautam.vivek@samsung.com>
---

Changes from v5:
 - Using a global spin_lock member in 'samsung_usbphy' structure to be
   used in samsung_usbphy_init() and samsung_usbphy_shutdown()
   to take care of all register initialization sequence.
 - Addressing few nits:
        - Using devphy_reg_offset instead of 'pmureg_devphy_offset'
        - Using if else block instead of ternary conditional statement
          in samsung_usbphy_set_isolation()
	- Using 'bool' type instead of 'int' for 'on' argument in
	  samsung_usbphy_set_isolation()
        - Amending few comments.

 .../devicetree/bindings/usb/samsung-usbphy.txt     |   36 +++++
 drivers/usb/phy/samsung-usbphy.c                   |  161 +++++++++++++++++---
 2 files changed, 175 insertions(+), 22 deletions(-)

diff --git a/Documentation/devicetree/bindings/usb/samsung-usbphy.txt b/Documentation/devicetree/bindings/usb/samsung-usbphy.txt
index 7b26e2d..22d06cf 100644
--- a/Documentation/devicetree/bindings/usb/samsung-usbphy.txt
+++ b/Documentation/devicetree/bindings/usb/samsung-usbphy.txt
@@ -9,3 +9,39 @@ Required properties:
 - compatible : should be "samsung,exynos4210-usbphy"
 - reg : base physical address of the phy registers and length of memory mapped
 	region.
+
+Optional properties:
+- #address-cells: should be '1' when usbphy node has a child node with 'reg'
+		  property.
+- #size-cells: should be '1' when usbphy node has a child node with 'reg'
+	       property.
+- ranges: allows valid translation between child's address space and parent's
+	  address space.
+
+- The child node 'usbphy-sys' to the node 'usbphy' is for the system controller
+  interface for usb-phy. It should provide the following information required by
+  usb-phy controller to control phy.
+  - reg : base physical address of PHY_CONTROL registers.
+	  The size of this register is the total sum of size of all PHY_CONTROL
+	  registers that the SoC has. For example, the size will be
+	  '0x4' in case we have only one PHY_CONTROL register (e.g.
+	  OTHERS register in S3C64XX or USB_PHY_CONTROL register in S5PV210)
+	  and, '0x8' in case we have two PHY_CONTROL registers (e.g.
+	  USBDEVICE_PHY_CONTROL and USBHOST_PHY_CONTROL registers in exynos4x).
+	  and so on.
+
+Example:
+ - Exynos4210
+
+	usbphy@125B0000 {
+		#address-cells = <1>;
+		#size-cells = <1>;
+		compatible = "samsung,exynos4210-usbphy";
+		reg = <0x125B0000 0x100>;
+		ranges;
+
+		usbphy-sys {
+			/* USB device and host PHY_CONTROL registers */
+			reg = <0x10020704 0x8>;
+		};
+	};
diff --git a/drivers/usb/phy/samsung-usbphy.c b/drivers/usb/phy/samsung-usbphy.c
index 5c5e1bb5..7eec7c3 100644
--- a/drivers/usb/phy/samsung-usbphy.c
+++ b/drivers/usb/phy/samsung-usbphy.c
@@ -24,6 +24,7 @@
 #include <linux/err.h>
 #include <linux/io.h>
 #include <linux/of.h>
+#include <linux/of_address.h>
 #include <linux/usb/otg.h>
 #include <linux/platform_data/samsung-usbphy.h>
 
@@ -60,20 +61,46 @@
 #define MHZ (1000*1000)
 #endif
 
+#define S3C64XX_USBPHY_ENABLE			(0x1 << 16)
+#define EXYNOS_USBPHY_ENABLE			(0x1 << 0)
+
 enum samsung_cpu_type {
 	TYPE_S3C64XX,
 	TYPE_EXYNOS4210,
 };
 
 /*
+ * struct samsung_usbphy_drvdata - driver data for various SoC variants
+ * @cpu_type: machine identifier
+ * @devphy_en_mask: device phy enable mask for PHY CONTROL register
+ * @devphy_reg_offset: offset to DEVICE PHY CONTROL register from
+ *		       mapped address of system controller.
+ *
+ *	Here we have a separate mask for device type phy.
+ *	Having different masks for host and device type phy helps
+ *	in setting independent masks in case of SoCs like S5PV210,
+ *	in which PHY0 and PHY1 enable bits belong to same register
+ *	placed at position 0 and 1 respectively.
+ *	Although for newer SoCs like exynos these bits belong to
+ *	different registers altogether placed at position 0.
+ */
+struct samsung_usbphy_drvdata {
+	int cpu_type;
+	int devphy_en_mask;
+	u32 devphy_reg_offset;
+};
+
+/*
  * struct samsung_usbphy - transceiver driver state
  * @phy: transceiver structure
  * @plat: platform data
  * @dev: The parent device supplied to the probe function
  * @clk: usb phy clock
- * @regs: usb phy register memory base
+ * @regs: usb phy controller registers memory base
+ * @pmuregs: USB device PHY_CONTROL register memory base
  * @ref_clk_freq: reference clock frequency selection
- * @cpu_type: machine identifier
+ * @drv_data: driver data available for different SoCs
+ * @lock: lock for phy operations
  */
 struct samsung_usbphy {
 	struct usb_phy	phy;
@@ -81,12 +108,64 @@ struct samsung_usbphy {
 	struct device	*dev;
 	struct clk	*clk;
 	void __iomem	*regs;
+	void __iomem	*pmuregs;
 	int		ref_clk_freq;
-	int		cpu_type;
+	const struct samsung_usbphy_drvdata *drv_data;
+	spinlock_t	lock;
 };
 
 #define phy_to_sphy(x)		container_of((x), struct samsung_usbphy, phy)
 
+static int samsung_usbphy_parse_dt(struct samsung_usbphy *sphy)
+{
+	struct device_node *usbphy_sys;
+
+	/* Getting node for system controller interface for usb-phy */
+	usbphy_sys = of_get_child_by_name(sphy->dev->of_node, "usbphy-sys");
+	if (!usbphy_sys)
+		dev_warn(sphy->dev, "No sys-controller interface for usb-phy\n");
+
+	sphy->pmuregs = of_iomap(usbphy_sys, 0);
+
+	of_node_put(usbphy_sys);
+
+	if (sphy->pmuregs == NULL) {
+		dev_err(sphy->dev, "Can't get usb-phy pmu control register\n");
+		return -ENODEV;
+	}
+
+	return 0;
+}
+
+/*
+ * Set isolation here for phy.
+ * Here 'on = true' would mean USB PHY block is isolated, hence
+ * de-activated and vice-versa.
+ */
+static void samsung_usbphy_set_isolation(struct samsung_usbphy *sphy, bool on)
+{
+	void __iomem *reg;
+	u32 reg_val;
+	u32 en_mask;
+
+	if (!sphy->pmuregs) {
+		dev_warn(sphy->dev, "Can't set pmu isolation\n");
+		return;
+	}
+
+	reg = sphy->pmuregs + sphy->drv_data->devphy_reg_offset;
+	en_mask = sphy->drv_data->devphy_en_mask;
+
+	reg_val = readl(reg);
+
+	if (on)
+		reg_val &= ~en_mask;
+	else
+		reg_val |= en_mask;
+
+	writel(reg_val, reg);
+}
+
 /*
  * Returns reference clock frequency selection value
  */
@@ -112,7 +191,7 @@ static int samsung_usbphy_get_refclk_freq(struct samsung_usbphy *sphy)
 		refclk_freq = PHYCLK_CLKSEL_48M;
 		break;
 	default:
-		if (sphy->cpu_type == TYPE_S3C64XX)
+		if (sphy->drv_data->cpu_type == TYPE_S3C64XX)
 			refclk_freq = PHYCLK_CLKSEL_48M;
 		else
 			refclk_freq = PHYCLK_CLKSEL_24M;
@@ -135,7 +214,7 @@ static void samsung_usbphy_enable(struct samsung_usbphy *sphy)
 	phypwr = readl(regs + SAMSUNG_PHYPWR);
 	rstcon = readl(regs + SAMSUNG_RSTCON);
 
-	switch (sphy->cpu_type) {
+	switch (sphy->drv_data->cpu_type) {
 	case TYPE_S3C64XX:
 		phyclk &= ~PHYCLK_COMMON_ON_N;
 		phypwr &= ~PHYPWR_NORMAL_MASK;
@@ -165,7 +244,7 @@ static void samsung_usbphy_disable(struct samsung_usbphy *sphy)
 
 	phypwr = readl(regs + SAMSUNG_PHYPWR);
 
-	switch (sphy->cpu_type) {
+	switch (sphy->drv_data->cpu_type) {
 	case TYPE_S3C64XX:
 		phypwr |= PHYPWR_NORMAL_MASK;
 		break;
@@ -185,6 +264,7 @@ static void samsung_usbphy_disable(struct samsung_usbphy *sphy)
 static int samsung_usbphy_init(struct usb_phy *phy)
 {
 	struct samsung_usbphy *sphy;
+	unsigned long flags;
 	int ret = 0;
 
 	sphy = phy_to_sphy(phy);
@@ -196,13 +276,19 @@ static int samsung_usbphy_init(struct usb_phy *phy)
 		return ret;
 	}
 
+	spin_lock_irqsave(&sphy->lock, flags);
+
 	/* Disable phy isolation */
 	if (sphy->plat && sphy->plat->pmu_isolation)
 		sphy->plat->pmu_isolation(false);
+	else
+		samsung_usbphy_set_isolation(sphy, false);
 
 	/* Initialize usb phy registers */
 	samsung_usbphy_enable(sphy);
 
+	spin_unlock_irqrestore(&sphy->lock, flags);
+
 	/* Disable the phy clock */
 	clk_disable_unprepare(sphy->clk);
 	return ret;
@@ -214,6 +300,7 @@ static int samsung_usbphy_init(struct usb_phy *phy)
 static void samsung_usbphy_shutdown(struct usb_phy *phy)
 {
 	struct samsung_usbphy *sphy;
+	unsigned long flags;
 
 	sphy = phy_to_sphy(phy);
 
@@ -222,44 +309,47 @@ static void samsung_usbphy_shutdown(struct usb_phy *phy)
 		return;
 	}
 
+	spin_lock_irqsave(&sphy->lock, flags);
+
 	/* De-initialize usb phy registers */
 	samsung_usbphy_disable(sphy);
 
 	/* Enable phy isolation */
 	if (sphy->plat && sphy->plat->pmu_isolation)
 		sphy->plat->pmu_isolation(true);
+	else
+		samsung_usbphy_set_isolation(sphy, true);
+
+	spin_unlock_irqrestore(&sphy->lock, flags);
 
 	clk_disable_unprepare(sphy->clk);
 }
 
 static const struct of_device_id samsung_usbphy_dt_match[];
 
-static inline int samsung_usbphy_get_driver_data(struct platform_device *pdev)
+static inline const struct samsung_usbphy_drvdata
+*samsung_usbphy_get_driver_data(struct platform_device *pdev)
 {
 	if (pdev->dev.of_node) {
 		const struct of_device_id *match;
 		match = of_match_node(samsung_usbphy_dt_match,
 							pdev->dev.of_node);
-		return (int) match->data;
+		return match->data;
 	}
 
-	return platform_get_device_id(pdev)->driver_data;
+	return (struct samsung_usbphy_drvdata *)
+				platform_get_device_id(pdev)->driver_data;
 }
 
 static int __devinit samsung_usbphy_probe(struct platform_device *pdev)
 {
 	struct samsung_usbphy *sphy;
-	struct samsung_usbphy_data *pdata;
+	struct samsung_usbphy_data *pdata = pdev->dev.platform_data;
 	struct device *dev = &pdev->dev;
 	struct resource *phy_mem;
 	void __iomem	*phy_base;
 	struct clk *clk;
-
-	pdata = pdev->dev.platform_data;
-	if (!pdata) {
-		dev_err(&pdev->dev, "%s: no platform data defined\n", __func__);
-		return -EINVAL;
-	}
+	int ret;
 
 	phy_mem = platform_get_resource(pdev, IORESOURCE_MEM, 0);
 	if (!phy_mem) {
@@ -283,7 +373,19 @@ static int __devinit samsung_usbphy_probe(struct platform_device *pdev)
 		return PTR_ERR(clk);
 	}
 
-	sphy->dev		= &pdev->dev;
+	sphy->dev = dev;
+
+	if (dev->of_node) {
+		ret = samsung_usbphy_parse_dt(sphy);
+		if (ret < 0)
+			return ret;
+	} else {
+		if (!pdata) {
+			dev_err(dev, "no platform data specified\n");
+			return -EINVAL;
+		}
+	}
+
 	sphy->plat		= pdata;
 	sphy->regs		= phy_base;
 	sphy->clk		= clk;
@@ -291,9 +393,11 @@ static int __devinit samsung_usbphy_probe(struct platform_device *pdev)
 	sphy->phy.label		= "samsung-usbphy";
 	sphy->phy.init		= samsung_usbphy_init;
 	sphy->phy.shutdown	= samsung_usbphy_shutdown;
-	sphy->cpu_type		= samsung_usbphy_get_driver_data(pdev);
+	sphy->drv_data		= samsung_usbphy_get_driver_data(pdev);
 	sphy->ref_clk_freq	= samsung_usbphy_get_refclk_freq(sphy);
 
+	spin_lock_init(&sphy->lock);
+
 	platform_set_drvdata(pdev, sphy);
 
 	return usb_add_phy(&sphy->phy, USB_PHY_TYPE_USB2);
@@ -305,17 +409,30 @@ static int __exit samsung_usbphy_remove(struct platform_device *pdev)
 
 	usb_remove_phy(&sphy->phy);
 
+	if (sphy->pmuregs)
+		iounmap(sphy->pmuregs);
+
 	return 0;
 }
 
+static const struct samsung_usbphy_drvdata usbphy_s3c64xx = {
+	.cpu_type		= TYPE_S3C64XX,
+	.devphy_en_mask		= S3C64XX_USBPHY_ENABLE,
+};
+
+static const struct samsung_usbphy_drvdata usbphy_exynos4 = {
+	.cpu_type		= TYPE_EXYNOS4210,
+	.devphy_en_mask		= EXYNOS_USBPHY_ENABLE,
+};
+
 #ifdef CONFIG_OF
 static const struct of_device_id samsung_usbphy_dt_match[] = {
 	{
 		.compatible = "samsung,s3c64xx-usbphy",
-		.data = (void *)TYPE_S3C64XX,
+		.data = &usbphy_s3c64xx,
 	}, {
 		.compatible = "samsung,exynos4210-usbphy",
-		.data = (void *)TYPE_EXYNOS4210,
+		.data = &usbphy_exynos4,
 	},
 	{},
 };
@@ -325,10 +442,10 @@ MODULE_DEVICE_TABLE(of, samsung_usbphy_dt_match);
 static struct platform_device_id samsung_usbphy_driver_ids[] = {
 	{
 		.name		= "s3c64xx-usbphy",
-		.driver_data	= TYPE_S3C64XX,
+		.driver_data	= (unsigned long)&usbphy_s3c64xx,
 	}, {
 		.name		= "exynos4210-usbphy",
-		.driver_data	= TYPE_EXYNOS4210,
+		.driver_data	= (unsigned long)&usbphy_exynos4,
 	},
 	{},
 };
-- 
1.7.6.5

Re: [PATCH] usb: phy: samsung: Add support to set pmu isolation

[Sylwester Nawrocki]

On 01/11/2013 09:08 AM, Vivek Gautam wrote:
> Adding support to parse device node data in order to get
> required properties to set pmu isolation for usb-phy.
> 
> Signed-off-by: Vivek Gautam <gautam.vivek@samsung.com>

Thanks for addressing my all comments,

Reviewed-by: Sylwester Nawrocki <s.nawrocki@samsung.com>

Re: [PATCH] usb: phy: samsung: Add support to set pmu isolation

[Vivek Gautam]

Hi Sylwester,


On Fri, Jan 11, 2013 at 2:51 PM, Sylwester Nawrocki
<s.nawrocki-Sze3O3UU22JBDgjK7y7TUQ@public.gmane.org> wrote:
> On 01/11/2013 09:08 AM, Vivek Gautam wrote:
>> Adding support to parse device node data in order to get
>> required properties to set pmu isolation for usb-phy.
>>
>> Signed-off-by: Vivek Gautam <gautam.vivek-Sze3O3UU22JBDgjK7y7TUQ@public.gmane.org>
>
> Thanks for addressing my all comments,
>
> Reviewed-by: Sylwester Nawrocki <s.nawrocki-Sze3O3UU22JBDgjK7y7TUQ@public.gmane.org>
>

Thanks for the review and help. :-)


-- 
Thanks & Regards
Vivek

Re: [PATCH] usb: phy: samsung: Add support to set pmu isolation

[Doug Anderson]

Vivek,

Sorry for being so absent from these reviews.  I'll try to look over a
few patches today, but please don't hold up anything on account of my
reviews.  I'm definitely a bit of an interested bystander in USB land.
 ;)

In general things look pretty good here.  :)  One last comment below...

On Fri, Jan 11, 2013 at 12:08 AM, Vivek Gautam
<gautam.vivek@samsung.com> wrote:> +static int
samsung_usbphy_parse_dt(struct samsung_usbphy *sphy)
> +{
> +       struct device_node *usbphy_sys;
> +
> +       /* Getting node for system controller interface for usb-phy */
> +       usbphy_sys = of_get_child_by_name(sphy->dev->of_node, "usbphy-sys");
> +       if (!usbphy_sys)
> +               dev_warn(sphy->dev, "No sys-controller interface for usb-phy\n");

Seems like you ought to return with an error here.  Calling of_iomap()
with a NULL value seems undesirable.

> +
> +       sphy->pmuregs = of_iomap(usbphy_sys, 0);
> +
> +       of_node_put(usbphy_sys);
> +
> +       if (sphy->pmuregs == NULL) {
> +               dev_err(sphy->dev, "Can't get usb-phy pmu control register\n");
> +               return -ENODEV;
> +       }
> +
> +       return 0;
> +}
> +
> +/*
> + * Set isolation here for phy.
> + * Here 'on = true' would mean USB PHY block is isolated, hence
> + * de-activated and vice-versa.
> + */

Thank you very much for this comment.  :)  This explains one of the
confusions I had earlier...


Once you fix the one error condition above you can add my
"Reviewed-by".  Thanks!

-Doug

Re: [PATCH] usb: phy: samsung: Add support to set pmu isolation

[Vivek Gautam]

Hi Doug,


On Tue, Jan 15, 2013 at 3:41 AM, Doug Anderson <dianders@chromium.org> wrote:
> Vivek,
>
> Sorry for being so absent from these reviews.  I'll try to look over a
> few patches today, but please don't hold up anything on account of my
> reviews.  I'm definitely a bit of an interested bystander in USB land.
>  ;)
>
> In general things look pretty good here.  :)  One last comment below...
>
> On Fri, Jan 11, 2013 at 12:08 AM, Vivek Gautam
> <gautam.vivek@samsung.com> wrote:> +static int
> samsung_usbphy_parse_dt(struct samsung_usbphy *sphy)
>> +{
>> +       struct device_node *usbphy_sys;
>> +
>> +       /* Getting node for system controller interface for usb-phy */
>> +       usbphy_sys = of_get_child_by_name(sphy->dev->of_node, "usbphy-sys");
>> +       if (!usbphy_sys)
>> +               dev_warn(sphy->dev, "No sys-controller interface for usb-phy\n");
>
> Seems like you ought to return with an error here.  Calling of_iomap()
> with a NULL value seems undesirable.
>

Yeah, true. This should have been returning error value alongwith dev_err().

>> +
>> +       sphy->pmuregs = of_iomap(usbphy_sys, 0);
>> +
>> +       of_node_put(usbphy_sys);
>> +
>> +       if (sphy->pmuregs == NULL) {
>> +               dev_err(sphy->dev, "Can't get usb-phy pmu control register\n");
>> +               return -ENODEV;
>> +       }
>> +
>> +       return 0;
>> +}
>> +
>> +/*
>> + * Set isolation here for phy.
>> + * Here 'on = true' would mean USB PHY block is isolated, hence
>> + * de-activated and vice-versa.
>> + */
>
> Thank you very much for this comment.  :)  This explains one of the
> confusions I had earlier...
>
Your welcome :-)
>
> Once you fix the one error condition above you can add my
> "Reviewed-by".  Thanks!
>
Sure, thanks !!



-- 
Thanks & Regards
Vivek

[PATCH v7] usb: phy: samsung: Add support to set pmu isolation

[Vivek Gautam]

Adding support to parse device node data in order to get
required properties to set pmu isolation for usb-phy.

Signed-off-by: Vivek Gautam <gautam.vivek-Sze3O3UU22JBDgjK7y7TUQ@public.gmane.org>
Reviewed-by: Sylwester Nawrocki <s.nawrocki-Sze3O3UU22JBDgjK7y7TUQ@public.gmane.org>
Reviewed-by: Doug Anderson <dianders-F7+t8E8rja9g9hUCZPvPmw@public.gmane.org>
---

Changes from v6:
 - Returning error code in samsung_usbphy_parse_dt() when
   'usbphy-sys' sub-node is not present and thereby putting up
   dev_err() instead of dev_warn()

 .../devicetree/bindings/usb/samsung-usbphy.txt     |   36 +++++
 drivers/usb/phy/samsung-usbphy.c                   |  163 +++++++++++++++++---
 2 files changed, 177 insertions(+), 22 deletions(-)

diff --git a/Documentation/devicetree/bindings/usb/samsung-usbphy.txt b/Documentation/devicetree/bindings/usb/samsung-usbphy.txt
index 7b26e2d..22d06cf 100644
--- a/Documentation/devicetree/bindings/usb/samsung-usbphy.txt
+++ b/Documentation/devicetree/bindings/usb/samsung-usbphy.txt
@@ -9,3 +9,39 @@ Required properties:
 - compatible : should be "samsung,exynos4210-usbphy"
 - reg : base physical address of the phy registers and length of memory mapped
 	region.
+
+Optional properties:
+- #address-cells: should be '1' when usbphy node has a child node with 'reg'
+		  property.
+- #size-cells: should be '1' when usbphy node has a child node with 'reg'
+	       property.
+- ranges: allows valid translation between child's address space and parent's
+	  address space.
+
+- The child node 'usbphy-sys' to the node 'usbphy' is for the system controller
+  interface for usb-phy. It should provide the following information required by
+  usb-phy controller to control phy.
+  - reg : base physical address of PHY_CONTROL registers.
+	  The size of this register is the total sum of size of all PHY_CONTROL
+	  registers that the SoC has. For example, the size will be
+	  '0x4' in case we have only one PHY_CONTROL register (e.g.
+	  OTHERS register in S3C64XX or USB_PHY_CONTROL register in S5PV210)
+	  and, '0x8' in case we have two PHY_CONTROL registers (e.g.
+	  USBDEVICE_PHY_CONTROL and USBHOST_PHY_CONTROL registers in exynos4x).
+	  and so on.
+
+Example:
+ - Exynos4210
+
+	usbphy@125B0000 {
+		#address-cells = <1>;
+		#size-cells = <1>;
+		compatible = "samsung,exynos4210-usbphy";
+		reg = <0x125B0000 0x100>;
+		ranges;
+
+		usbphy-sys {
+			/* USB device and host PHY_CONTROL registers */
+			reg = <0x10020704 0x8>;
+		};
+	};
diff --git a/drivers/usb/phy/samsung-usbphy.c b/drivers/usb/phy/samsung-usbphy.c
index 5c5e1bb5..30aebb5 100644
--- a/drivers/usb/phy/samsung-usbphy.c
+++ b/drivers/usb/phy/samsung-usbphy.c
@@ -24,6 +24,7 @@
 #include <linux/err.h>
 #include <linux/io.h>
 #include <linux/of.h>
+#include <linux/of_address.h>
 #include <linux/usb/otg.h>
 #include <linux/platform_data/samsung-usbphy.h>
 
@@ -60,20 +61,46 @@
 #define MHZ (1000*1000)
 #endif
 
+#define S3C64XX_USBPHY_ENABLE			(0x1 << 16)
+#define EXYNOS_USBPHY_ENABLE			(0x1 << 0)
+
 enum samsung_cpu_type {
 	TYPE_S3C64XX,
 	TYPE_EXYNOS4210,
 };
 
 /*
+ * struct samsung_usbphy_drvdata - driver data for various SoC variants
+ * @cpu_type: machine identifier
+ * @devphy_en_mask: device phy enable mask for PHY CONTROL register
+ * @devphy_reg_offset: offset to DEVICE PHY CONTROL register from
+ *		       mapped address of system controller.
+ *
+ *	Here we have a separate mask for device type phy.
+ *	Having different masks for host and device type phy helps
+ *	in setting independent masks in case of SoCs like S5PV210,
+ *	in which PHY0 and PHY1 enable bits belong to same register
+ *	placed at position 0 and 1 respectively.
+ *	Although for newer SoCs like exynos these bits belong to
+ *	different registers altogether placed at position 0.
+ */
+struct samsung_usbphy_drvdata {
+	int cpu_type;
+	int devphy_en_mask;
+	u32 devphy_reg_offset;
+};
+
+/*
  * struct samsung_usbphy - transceiver driver state
  * @phy: transceiver structure
  * @plat: platform data
  * @dev: The parent device supplied to the probe function
  * @clk: usb phy clock
- * @regs: usb phy register memory base
+ * @regs: usb phy controller registers memory base
+ * @pmuregs: USB device PHY_CONTROL register memory base
  * @ref_clk_freq: reference clock frequency selection
- * @cpu_type: machine identifier
+ * @drv_data: driver data available for different SoCs
+ * @lock: lock for phy operations
  */
 struct samsung_usbphy {
 	struct usb_phy	phy;
@@ -81,12 +108,66 @@ struct samsung_usbphy {
 	struct device	*dev;
 	struct clk	*clk;
 	void __iomem	*regs;
+	void __iomem	*pmuregs;
 	int		ref_clk_freq;
-	int		cpu_type;
+	const struct samsung_usbphy_drvdata *drv_data;
+	spinlock_t	lock;
 };
 
 #define phy_to_sphy(x)		container_of((x), struct samsung_usbphy, phy)
 
+static int samsung_usbphy_parse_dt(struct samsung_usbphy *sphy)
+{
+	struct device_node *usbphy_sys;
+
+	/* Getting node for system controller interface for usb-phy */
+	usbphy_sys = of_get_child_by_name(sphy->dev->of_node, "usbphy-sys");
+	if (!usbphy_sys) {
+		dev_err(sphy->dev, "No sys-controller interface for usb-phy\n");
+		return -ENODEV;
+	}
+
+	sphy->pmuregs = of_iomap(usbphy_sys, 0);
+
+	of_node_put(usbphy_sys);
+
+	if (sphy->pmuregs == NULL) {
+		dev_err(sphy->dev, "Can't get usb-phy pmu control register\n");
+		return -ENODEV;
+	}
+
+	return 0;
+}
+
+/*
+ * Set isolation here for phy.
+ * Here 'on = true' would mean USB PHY block is isolated, hence
+ * de-activated and vice-versa.
+ */
+static void samsung_usbphy_set_isolation(struct samsung_usbphy *sphy, bool on)
+{
+	void __iomem *reg;
+	u32 reg_val;
+	u32 en_mask;
+
+	if (!sphy->pmuregs) {
+		dev_warn(sphy->dev, "Can't set pmu isolation\n");
+		return;
+	}
+
+	reg = sphy->pmuregs + sphy->drv_data->devphy_reg_offset;
+	en_mask = sphy->drv_data->devphy_en_mask;
+
+	reg_val = readl(reg);
+
+	if (on)
+		reg_val &= ~en_mask;
+	else
+		reg_val |= en_mask;
+
+	writel(reg_val, reg);
+}
+
 /*
  * Returns reference clock frequency selection value
  */
@@ -112,7 +193,7 @@ static int samsung_usbphy_get_refclk_freq(struct samsung_usbphy *sphy)
 		refclk_freq = PHYCLK_CLKSEL_48M;
 		break;
 	default:
-		if (sphy->cpu_type == TYPE_S3C64XX)
+		if (sphy->drv_data->cpu_type == TYPE_S3C64XX)
 			refclk_freq = PHYCLK_CLKSEL_48M;
 		else
 			refclk_freq = PHYCLK_CLKSEL_24M;
@@ -135,7 +216,7 @@ static void samsung_usbphy_enable(struct samsung_usbphy *sphy)
 	phypwr = readl(regs + SAMSUNG_PHYPWR);
 	rstcon = readl(regs + SAMSUNG_RSTCON);
 
-	switch (sphy->cpu_type) {
+	switch (sphy->drv_data->cpu_type) {
 	case TYPE_S3C64XX:
 		phyclk &= ~PHYCLK_COMMON_ON_N;
 		phypwr &= ~PHYPWR_NORMAL_MASK;
@@ -165,7 +246,7 @@ static void samsung_usbphy_disable(struct samsung_usbphy *sphy)
 
 	phypwr = readl(regs + SAMSUNG_PHYPWR);
 
-	switch (sphy->cpu_type) {
+	switch (sphy->drv_data->cpu_type) {
 	case TYPE_S3C64XX:
 		phypwr |= PHYPWR_NORMAL_MASK;
 		break;
@@ -185,6 +266,7 @@ static void samsung_usbphy_disable(struct samsung_usbphy *sphy)
 static int samsung_usbphy_init(struct usb_phy *phy)
 {
 	struct samsung_usbphy *sphy;
+	unsigned long flags;
 	int ret = 0;
 
 	sphy = phy_to_sphy(phy);
@@ -196,13 +278,19 @@ static int samsung_usbphy_init(struct usb_phy *phy)
 		return ret;
 	}
 
+	spin_lock_irqsave(&sphy->lock, flags);
+
 	/* Disable phy isolation */
 	if (sphy->plat && sphy->plat->pmu_isolation)
 		sphy->plat->pmu_isolation(false);
+	else
+		samsung_usbphy_set_isolation(sphy, false);
 
 	/* Initialize usb phy registers */
 	samsung_usbphy_enable(sphy);
 
+	spin_unlock_irqrestore(&sphy->lock, flags);
+
 	/* Disable the phy clock */
 	clk_disable_unprepare(sphy->clk);
 	return ret;
@@ -214,6 +302,7 @@ static int samsung_usbphy_init(struct usb_phy *phy)
 static void samsung_usbphy_shutdown(struct usb_phy *phy)
 {
 	struct samsung_usbphy *sphy;
+	unsigned long flags;
 
 	sphy = phy_to_sphy(phy);
 
@@ -222,44 +311,47 @@ static void samsung_usbphy_shutdown(struct usb_phy *phy)
 		return;
 	}
 
+	spin_lock_irqsave(&sphy->lock, flags);
+
 	/* De-initialize usb phy registers */
 	samsung_usbphy_disable(sphy);
 
 	/* Enable phy isolation */
 	if (sphy->plat && sphy->plat->pmu_isolation)
 		sphy->plat->pmu_isolation(true);
+	else
+		samsung_usbphy_set_isolation(sphy, true);
+
+	spin_unlock_irqrestore(&sphy->lock, flags);
 
 	clk_disable_unprepare(sphy->clk);
 }
 
 static const struct of_device_id samsung_usbphy_dt_match[];
 
-static inline int samsung_usbphy_get_driver_data(struct platform_device *pdev)
+static inline const struct samsung_usbphy_drvdata
+*samsung_usbphy_get_driver_data(struct platform_device *pdev)
 {
 	if (pdev->dev.of_node) {
 		const struct of_device_id *match;
 		match = of_match_node(samsung_usbphy_dt_match,
 							pdev->dev.of_node);
-		return (int) match->data;
+		return match->data;
 	}
 
-	return platform_get_device_id(pdev)->driver_data;
+	return (struct samsung_usbphy_drvdata *)
+				platform_get_device_id(pdev)->driver_data;
 }
 
 static int __devinit samsung_usbphy_probe(struct platform_device *pdev)
 {
 	struct samsung_usbphy *sphy;
-	struct samsung_usbphy_data *pdata;
+	struct samsung_usbphy_data *pdata = pdev->dev.platform_data;
 	struct device *dev = &pdev->dev;
 	struct resource *phy_mem;
 	void __iomem	*phy_base;
 	struct clk *clk;
-
-	pdata = pdev->dev.platform_data;
-	if (!pdata) {
-		dev_err(&pdev->dev, "%s: no platform data defined\n", __func__);
-		return -EINVAL;
-	}
+	int ret;
 
 	phy_mem = platform_get_resource(pdev, IORESOURCE_MEM, 0);
 	if (!phy_mem) {
@@ -283,7 +375,19 @@ static int __devinit samsung_usbphy_probe(struct platform_device *pdev)
 		return PTR_ERR(clk);
 	}
 
-	sphy->dev		= &pdev->dev;
+	sphy->dev = dev;
+
+	if (dev->of_node) {
+		ret = samsung_usbphy_parse_dt(sphy);
+		if (ret < 0)
+			return ret;
+	} else {
+		if (!pdata) {
+			dev_err(dev, "no platform data specified\n");
+			return -EINVAL;
+		}
+	}
+
 	sphy->plat		= pdata;
 	sphy->regs		= phy_base;
 	sphy->clk		= clk;
@@ -291,9 +395,11 @@ static int __devinit samsung_usbphy_probe(struct platform_device *pdev)
 	sphy->phy.label		= "samsung-usbphy";
 	sphy->phy.init		= samsung_usbphy_init;
 	sphy->phy.shutdown	= samsung_usbphy_shutdown;
-	sphy->cpu_type		= samsung_usbphy_get_driver_data(pdev);
+	sphy->drv_data		= samsung_usbphy_get_driver_data(pdev);
 	sphy->ref_clk_freq	= samsung_usbphy_get_refclk_freq(sphy);
 
+	spin_lock_init(&sphy->lock);
+
 	platform_set_drvdata(pdev, sphy);
 
 	return usb_add_phy(&sphy->phy, USB_PHY_TYPE_USB2);
@@ -305,17 +411,30 @@ static int __exit samsung_usbphy_remove(struct platform_device *pdev)
 
 	usb_remove_phy(&sphy->phy);
 
+	if (sphy->pmuregs)
+		iounmap(sphy->pmuregs);
+
 	return 0;
 }
 
+static const struct samsung_usbphy_drvdata usbphy_s3c64xx = {
+	.cpu_type		= TYPE_S3C64XX,
+	.devphy_en_mask		= S3C64XX_USBPHY_ENABLE,
+};
+
+static const struct samsung_usbphy_drvdata usbphy_exynos4 = {
+	.cpu_type		= TYPE_EXYNOS4210,
+	.devphy_en_mask		= EXYNOS_USBPHY_ENABLE,
+};
+
 #ifdef CONFIG_OF
 static const struct of_device_id samsung_usbphy_dt_match[] = {
 	{
 		.compatible = "samsung,s3c64xx-usbphy",
-		.data = (void *)TYPE_S3C64XX,
+		.data = &usbphy_s3c64xx,
 	}, {
 		.compatible = "samsung,exynos4210-usbphy",
-		.data = (void *)TYPE_EXYNOS4210,
+		.data = &usbphy_exynos4,
 	},
 	{},
 };
@@ -325,10 +444,10 @@ MODULE_DEVICE_TABLE(of, samsung_usbphy_dt_match);
 static struct platform_device_id samsung_usbphy_driver_ids[] = {
 	{
 		.name		= "s3c64xx-usbphy",
-		.driver_data	= TYPE_S3C64XX,
+		.driver_data	= (unsigned long)&usbphy_s3c64xx,
 	}, {
 		.name		= "exynos4210-usbphy",
-		.driver_data	= TYPE_EXYNOS4210,
+		.driver_data	= (unsigned long)&usbphy_exynos4,
 	},
 	{},
 };
-- 
1.7.6.5

RE: [PATCH v7] usb: phy: samsung: Add support to set pmu isolation

[Kukjin Kim]

Vivek Gautam wrote:
> 
> Adding support to parse device node data in order to get
> required properties to set pmu isolation for usb-phy.
> 
> Signed-off-by: Vivek Gautam <gautam.vivek-Sze3O3UU22JBDgjK7y7TUQ@public.gmane.org>
> Reviewed-by: Sylwester Nawrocki <s.nawrocki-Sze3O3UU22JBDgjK7y7TUQ@public.gmane.org>
> Reviewed-by: Doug Anderson <dianders-F7+t8E8rja9g9hUCZPvPmw@public.gmane.org>

This looks good to me,
Acked-by: Kukjin Kim <kgene.kim-Sze3O3UU22JBDgjK7y7TUQ@public.gmane.org>

Vivek, could you please re-send following in one series?
- [PATCH v9 1/2] usb: phy: samsung: Introducing usb phy driver for hsotg
- [PATCH v8 2/2] usb: s3c-hsotg: Adding phy driver support

As I know, this should be applied on top of above patches.

Thanks.

- Kukjin


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Re: [PATCH v7] usb: phy: samsung: Add support to set pmu isolation

[Vivek Gautam]

HI Kukjin,

On Fri, Jan 18, 2013 at 6:46 AM, Kukjin Kim <kgene.kim@samsung.com> wrote:
> Vivek Gautam wrote:
>>
>> Adding support to parse device node data in order to get
>> required properties to set pmu isolation for usb-phy.
>>
>> Signed-off-by: Vivek Gautam <gautam.vivek@samsung.com>
>> Reviewed-by: Sylwester Nawrocki <s.nawrocki@samsung.com>
>> Reviewed-by: Doug Anderson <dianders@chromium.org>
>
> This looks good to me,
> Acked-by: Kukjin Kim <kgene.kim@samsung.com>
>
Thanks

> Vivek, could you please re-send following in one series?
> - [PATCH v9 1/2] usb: phy: samsung: Introducing usb phy driver for hsotg
> - [PATCH v8 2/2] usb: s3c-hsotg: Adding phy driver support
>

Praveen will re-send this patch-series asap.

> As I know, this should be applied on top of above patches.
>



-- 
Thanks & Regards
Vivek