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Subject[PATCH v5] usb: phy: samsung: Add support to set pmu isolation
Date
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 v4:
- Added 'ranges' property to usbphy node, to iomap the child nodes's
address space.
- Using offset for device phy control register to make it more generic.
- Using of_iomap() to map register for child node.
- Removing buggy check for IS_ERR_OR_NULL for ioremapped address, instead
checking it against NULL.
- Adding spin_lock around read-modify-write block in
samsung_usbphy_set_isolation().
- removing unnecessary casting for match->data.

.../devicetree/bindings/usb/samsung-usbphy.txt | 35 +++++
drivers/usb/phy/samsung-usbphy.c | 145 +++++++++++++++++---
2 files changed, 159 insertions(+), 21 deletions(-)

diff --git a/Documentation/devicetree/bindings/usb/samsung-usbphy.txt b/Documentation/devicetree/bindings/usb/samsung-usbphy.txt
index 7b26e2d..1b97765 100644
--- a/Documentation/devicetree/bindings/usb/samsung-usbphy.txt
+++ b/Documentation/devicetree/bindings/usb/samsung-usbphy.txt
@@ -9,3 +9,38 @@ 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 register in PMU which
+ enables/disables the phy controller.
+ 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 (like in S3C64XX) or
+ '0x8' in case we have two phy-control registers (like in Exynos4210)
+ 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..99e16e9 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 +61,45 @@
#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
+ * @pmureg_devphy_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 pmureg_devphy_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
+ * @pmureg: usb device phy-control pmu register memory base
* @ref_clk_freq: reference clock frequency selection
- * @cpu_type: machine identifier
+ * @drv_data: driver data available for different SoCs
*/
struct samsung_usbphy {
struct usb_phy phy;
@@ -81,12 +107,63 @@ struct samsung_usbphy {
struct device *dev;
struct clk *clk;
void __iomem *regs;
+ void __iomem *pmureg;
int ref_clk_freq;
- int cpu_type;
+ const struct samsung_usbphy_drvdata *drv_data;
};

#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->pmureg = of_iomap(usbphy_sys, 0);
+
+ of_node_put(usbphy_sys);
+
+ if (sphy->pmureg == NULL) {
+ dev_err(sphy->dev, "Can't get usb-phy pmu control register\n");
+ return -ENODEV;
+ }
+
+ return 0;
+}
+
+/*
+ * Set isolation here for phy.
+ * SOCs control this by controlling corresponding PMU registers
+ */
+static void samsung_usbphy_set_isolation(struct samsung_usbphy *sphy, int on)
+{
+ static DEFINE_SPINLOCK(lock);
+ unsigned long flags;
+ void __iomem *reg;
+ u32 reg_val;
+ u32 en_mask;
+
+ if (!sphy->pmureg) {
+ dev_warn(sphy->dev, "Can't set pmu isolation\n");
+ return;
+ }
+
+ reg = sphy->pmureg + sphy->drv_data->pmureg_devphy_offset;
+ en_mask = sphy->drv_data->devphy_en_mask;
+
+ spin_lock_irqsave(&lock, flags);
+
+ reg_val = readl(reg);
+ reg_val = on ? (reg_val & ~en_mask) : (reg_val | en_mask);
+ writel(reg_val, reg);
+
+ spin_unlock_irqrestore(&lock, flags);
+}
+
/*
* Returns reference clock frequency selection value
*/
@@ -112,7 +189,7 @@ 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 +212,7 @@ 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 +242,7 @@ 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;
@@ -199,6 +276,8 @@ static int samsung_usbphy_init(struct usb_phy *phy)
/* 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);
@@ -228,38 +307,37 @@ static void samsung_usbphy_shutdown(struct usb_phy *phy)
/* Enable phy isolation */
if (sphy->plat && sphy->plat->pmu_isolation)
sphy->plat->pmu_isolation(true);
+ else
+ samsung_usbphy_set_isolation(sphy, true);

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 +361,19 @@ 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;
@@ -291,7 +381,7 @@ 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);

platform_set_drvdata(pdev, sphy);
@@ -305,17 +395,30 @@ static int __exit samsung_usbphy_remove(struct platform_device *pdev)

usb_remove_phy(&sphy->phy);

+ if (sphy->pmureg)
+ iounmap(sphy->pmureg);
+
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 +428,10 @@ 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


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