usb: phy: Add AM335x PHY driver

This driver is a redo of my earlier attempt. It uses parts of the
generic PHY driver and uses the new control driver for the register
the phy needs to power on/off the phy. It also enables easy access for
the wakeup register which is not yet implemented.
The difference between the omap attempt is:
- no static holding variable
- one global visible function which exports a struct with callbacks to
  access the "control" registers.

Signed-off-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
Signed-off-by: Felipe Balbi <balbi@ti.com>
This commit is contained in:
Sebastian Andrzej Siewior 2013-07-30 21:43:45 +02:00 коммит произвёл Felipe Balbi
Родитель 53b6fc28ea
Коммит 3bb869c8b3
5 изменённых файлов: 270 добавлений и 0 удалений

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@ -86,6 +86,18 @@ config OMAP_USB3
This driver interacts with the "OMAP Control USB Driver" to power This driver interacts with the "OMAP Control USB Driver" to power
on/off the PHY. on/off the PHY.
config AM335X_CONTROL_USB
tristate
config AM335X_PHY_USB
tristate "AM335x USB PHY Driver"
select USB_PHY
select AM335X_CONTROL_USB
select NOP_USB_XCEIV
help
This driver provides PHY support for that phy which part for the
AM335x SoC.
config SAMSUNG_USBPHY config SAMSUNG_USBPHY
tristate tristate
help help

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@ -16,6 +16,8 @@ obj-$(CONFIG_ISP1301_OMAP) += phy-isp1301-omap.o
obj-$(CONFIG_MV_U3D_PHY) += phy-mv-u3d-usb.o obj-$(CONFIG_MV_U3D_PHY) += phy-mv-u3d-usb.o
obj-$(CONFIG_NOP_USB_XCEIV) += phy-generic.o obj-$(CONFIG_NOP_USB_XCEIV) += phy-generic.o
obj-$(CONFIG_OMAP_CONTROL_USB) += phy-omap-control.o obj-$(CONFIG_OMAP_CONTROL_USB) += phy-omap-control.o
obj-$(CONFIG_AM335X_CONTROL_USB) += phy-am335x-control.o
obj-$(CONFIG_AM335X_PHY_USB) += phy-am335x.o
obj-$(CONFIG_OMAP_USB2) += phy-omap-usb2.o obj-$(CONFIG_OMAP_USB2) += phy-omap-usb2.o
obj-$(CONFIG_OMAP_USB3) += phy-omap-usb3.o obj-$(CONFIG_OMAP_USB3) += phy-omap-usb3.o
obj-$(CONFIG_SAMSUNG_USBPHY) += phy-samsung-usb.o obj-$(CONFIG_SAMSUNG_USBPHY) += phy-samsung-usb.o

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@ -0,0 +1,21 @@
#ifndef _AM335x_PHY_CONTROL_H_
#define _AM335x_PHY_CONTROL_H_
struct phy_control {
void (*phy_power)(struct phy_control *phy_ctrl, u32 id, bool on);
void (*phy_wkup)(struct phy_control *phy_ctrl, u32 id, bool on);
};
static inline void phy_ctrl_power(struct phy_control *phy_ctrl, u32 id, bool on)
{
phy_ctrl->phy_power(phy_ctrl, id, on);
}
static inline void phy_ctrl_wkup(struct phy_control *phy_ctrl, u32 id, bool on)
{
phy_ctrl->phy_wkup(phy_ctrl, id, on);
}
struct phy_control *am335x_get_phy_control(struct device *dev);
#endif

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@ -0,0 +1,136 @@
#include <linux/module.h>
#include <linux/platform_device.h>
#include <linux/of.h>
#include <linux/io.h>
struct phy_control {
void (*phy_power)(struct phy_control *phy_ctrl, u32 id, bool on);
void (*phy_wkup)(struct phy_control *phy_ctrl, u32 id, bool on);
};
struct am335x_control_usb {
struct device *dev;
void __iomem *phy_reg;
void __iomem *wkup;
spinlock_t lock;
struct phy_control phy_ctrl;
};
#define AM335X_USB0_CTRL 0x0
#define AM335X_USB1_CTRL 0x8
#define AM335x_USB_WKUP 0x0
#define USBPHY_CM_PWRDN (1 << 0)
#define USBPHY_OTG_PWRDN (1 << 1)
#define USBPHY_OTGVDET_EN (1 << 19)
#define USBPHY_OTGSESSEND_EN (1 << 20)
static void am335x_phy_power(struct phy_control *phy_ctrl, u32 id, bool on)
{
struct am335x_control_usb *usb_ctrl;
u32 val;
u32 reg;
usb_ctrl = container_of(phy_ctrl, struct am335x_control_usb, phy_ctrl);
switch (id) {
case 0:
reg = AM335X_USB0_CTRL;
break;
case 1:
reg = AM335X_USB1_CTRL;
break;
default:
__WARN();
return;
}
val = readl(usb_ctrl->phy_reg + reg);
if (on) {
val &= ~(USBPHY_CM_PWRDN | USBPHY_OTG_PWRDN);
val |= USBPHY_OTGVDET_EN | USBPHY_OTGSESSEND_EN;
} else {
val |= USBPHY_CM_PWRDN | USBPHY_OTG_PWRDN;
}
writel(val, usb_ctrl->phy_reg + reg);
}
static const struct phy_control ctrl_am335x = {
.phy_power = am335x_phy_power,
};
static const struct of_device_id omap_control_usb_id_table[] = {
{ .compatible = "ti,am335x-usb-ctrl-module", .data = &ctrl_am335x },
{}
};
MODULE_DEVICE_TABLE(of, omap_control_usb_id_table);
static struct platform_driver am335x_control_driver;
static int match(struct device *dev, void *data)
{
struct device_node *node = (struct device_node *)data;
return dev->of_node == node &&
dev->driver == &am335x_control_driver.driver;
}
struct phy_control *am335x_get_phy_control(struct device *dev)
{
struct device_node *node;
struct am335x_control_usb *ctrl_usb;
node = of_parse_phandle(dev->of_node, "ti,ctrl_mod", 0);
if (!node)
return NULL;
dev = bus_find_device(&platform_bus_type, NULL, node, match);
ctrl_usb = dev_get_drvdata(dev);
if (!ctrl_usb)
return NULL;
return &ctrl_usb->phy_ctrl;
}
EXPORT_SYMBOL_GPL(am335x_get_phy_control);
static int am335x_control_usb_probe(struct platform_device *pdev)
{
struct resource *res;
struct am335x_control_usb *ctrl_usb;
const struct of_device_id *of_id;
const struct phy_control *phy_ctrl;
of_id = of_match_node(omap_control_usb_id_table, pdev->dev.of_node);
if (!of_id)
return -EINVAL;
phy_ctrl = of_id->data;
ctrl_usb = devm_kzalloc(&pdev->dev, sizeof(*ctrl_usb), GFP_KERNEL);
if (!ctrl_usb) {
dev_err(&pdev->dev, "unable to alloc memory for control usb\n");
return -ENOMEM;
}
ctrl_usb->dev = &pdev->dev;
res = platform_get_resource_byname(pdev, IORESOURCE_MEM, "phy_ctrl");
ctrl_usb->phy_reg = devm_ioremap_resource(&pdev->dev, res);
if (IS_ERR(ctrl_usb->phy_reg))
return PTR_ERR(ctrl_usb->phy_reg);
spin_lock_init(&ctrl_usb->lock);
ctrl_usb->phy_ctrl = *phy_ctrl;
dev_set_drvdata(ctrl_usb->dev, ctrl_usb);
return 0;
}
static struct platform_driver am335x_control_driver = {
.probe = am335x_control_usb_probe,
.driver = {
.name = "am335x-control-usb",
.owner = THIS_MODULE,
.of_match_table = of_match_ptr(omap_control_usb_id_table),
},
};
module_platform_driver(am335x_control_driver);
MODULE_LICENSE("GPL v2");

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@ -0,0 +1,99 @@
#include <linux/module.h>
#include <linux/platform_device.h>
#include <linux/dma-mapping.h>
#include <linux/usb/otg.h>
#include <linux/usb/usb_phy_gen_xceiv.h>
#include <linux/slab.h>
#include <linux/clk.h>
#include <linux/regulator/consumer.h>
#include <linux/of.h>
#include <linux/of_address.h>
#include "am35x-phy-control.h"
#include "phy-generic.h"
struct am335x_phy {
struct usb_phy_gen_xceiv usb_phy_gen;
struct phy_control *phy_ctrl;
int id;
};
static int am335x_init(struct usb_phy *phy)
{
struct am335x_phy *am_phy = dev_get_drvdata(phy->dev);
phy_ctrl_power(am_phy->phy_ctrl, am_phy->id, true);
return 0;
}
static void am335x_shutdown(struct usb_phy *phy)
{
struct am335x_phy *am_phy = dev_get_drvdata(phy->dev);
phy_ctrl_power(am_phy->phy_ctrl, am_phy->id, false);
}
static int am335x_phy_probe(struct platform_device *pdev)
{
struct am335x_phy *am_phy;
struct device *dev = &pdev->dev;
int ret;
am_phy = devm_kzalloc(dev, sizeof(*am_phy), GFP_KERNEL);
if (!am_phy)
return -ENOMEM;
am_phy->phy_ctrl = am335x_get_phy_control(dev);
if (!am_phy->phy_ctrl)
return -EPROBE_DEFER;
am_phy->id = of_alias_get_id(pdev->dev.of_node, "phy");
if (am_phy->id < 0) {
dev_err(&pdev->dev, "Missing PHY id: %d\n", am_phy->id);
return am_phy->id;
}
ret = usb_phy_gen_create_phy(dev, &am_phy->usb_phy_gen,
USB_PHY_TYPE_USB2, 0, false, false);
if (ret)
return ret;
ret = usb_add_phy_dev(&am_phy->usb_phy_gen.phy);
if (ret)
goto err_add;
am_phy->usb_phy_gen.phy.init = am335x_init;
am_phy->usb_phy_gen.phy.shutdown = am335x_shutdown;
platform_set_drvdata(pdev, am_phy);
return 0;
err_add:
usb_phy_gen_cleanup_phy(&am_phy->usb_phy_gen);
return ret;
}
static int am335x_phy_remove(struct platform_device *pdev)
{
struct am335x_phy *am_phy = platform_get_drvdata(pdev);
usb_remove_phy(&am_phy->usb_phy_gen.phy);
return 0;
}
static const struct of_device_id am335x_phy_ids[] = {
{ .compatible = "ti,am335x-usb-phy" },
{ }
};
MODULE_DEVICE_TABLE(of, am335x_phy_ids);
static struct platform_driver am335x_phy_driver = {
.probe = am335x_phy_probe,
.remove = am335x_phy_remove,
.driver = {
.name = "am335x-phy-driver",
.owner = THIS_MODULE,
.of_match_table = of_match_ptr(am335x_phy_ids),
},
};
module_platform_driver(am335x_phy_driver);
MODULE_LICENSE("GPL v2");