linux/drivers/usb/phy/phy-am335x-control.c
Suzuki K Poulose 418e3ea157 bus_find_device: Unify the match callback with class_find_device
There is an arbitrary difference between the prototypes of
bus_find_device() and class_find_device() preventing their callers
from passing the same pair of data and match() arguments to both of
them, which is the const qualifier used in the prototype of
class_find_device().  If that qualifier is also used in the
bus_find_device() prototype, it will be possible to pass the same
match() callback function to both bus_find_device() and
class_find_device(), which will allow some optimizations to be made in
order to avoid code duplication going forward.  Also with that, constify
the "data" parameter as it is passed as a const to the match function.

For this reason, change the prototype of bus_find_device() to match
the prototype of class_find_device() and adjust its callers to use the
const qualifier in accordance with the new prototype of it.

Cc: Alexander Shishkin <alexander.shishkin@linux.intel.com>
Cc: Andrew Lunn <andrew@lunn.ch>
Cc: Andreas Noever <andreas.noever@gmail.com>
Cc: Arnd Bergmann <arnd@arndb.de>
Cc: Bjorn Helgaas <bhelgaas@google.com>
Cc: Corey Minyard <minyard@acm.org>
Cc: Christian Borntraeger <borntraeger@de.ibm.com>
Cc: David Kershner <david.kershner@unisys.com>
Cc: "David S. Miller" <davem@davemloft.net>
Cc: David Airlie <airlied@linux.ie>
Cc: Felipe Balbi <balbi@kernel.org>
Cc: Frank Rowand <frowand.list@gmail.com>
Cc: Grygorii Strashko <grygorii.strashko@ti.com>
Cc: Harald Freudenberger <freude@linux.ibm.com>
Cc: Hartmut Knaack <knaack.h@gmx.de>
Cc: Heiko Stuebner <heiko@sntech.de>
Cc: Jason Gunthorpe <jgg@ziepe.ca>
Cc: Jonathan Cameron <jic23@kernel.org>
Cc: "James E.J. Bottomley" <jejb@linux.ibm.com>
Cc: Len Brown <lenb@kernel.org>
Cc: Mark Brown <broonie@kernel.org>
Cc: Michael Ellerman <mpe@ellerman.id.au>
Cc: Michael Jamet <michael.jamet@intel.com>
Cc: "Martin K. Petersen" <martin.petersen@oracle.com>
Cc: Peter Oberparleiter <oberpar@linux.ibm.com>
Cc: Sebastian Ott <sebott@linux.ibm.com>
Cc: Srinivas Kandagatla <srinivas.kandagatla@linaro.org>
Cc: Yehezkel Bernat <YehezkelShB@gmail.com>
Cc: rafael@kernel.org
Acked-by: Corey Minyard <minyard@acm.org>
Acked-by: David Kershner <david.kershner@unisys.com>
Acked-by: Mark Brown <broonie@kernel.org>
Acked-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
Acked-by: Srinivas Kandagatla <srinivas.kandagatla@linaro.org>
Acked-by: Wolfram Sang <wsa@the-dreams.de> # for the I2C parts
Acked-by: Rob Herring <robh@kernel.org>
Signed-off-by: Suzuki K Poulose <suzuki.poulose@arm.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2019-06-24 05:22:31 +02:00

196 lines
4.4 KiB
C

// SPDX-License-Identifier: GPL-2.0
#include <linux/module.h>
#include <linux/platform_device.h>
#include <linux/err.h>
#include <linux/of.h>
#include <linux/io.h>
#include <linux/delay.h>
#include <linux/usb/otg.h>
#include "phy-am335x-control.h"
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)
#define AM335X_PHY0_WK_EN (1 << 0)
#define AM335X_PHY1_WK_EN (1 << 8)
static void am335x_phy_wkup(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_PHY0_WK_EN;
break;
case 1:
reg = AM335X_PHY1_WK_EN;
break;
default:
WARN_ON(1);
return;
}
spin_lock(&usb_ctrl->lock);
val = readl(usb_ctrl->wkup);
if (on)
val |= reg;
else
val &= ~reg;
writel(val, usb_ctrl->wkup);
spin_unlock(&usb_ctrl->lock);
}
static void am335x_phy_power(struct phy_control *phy_ctrl, u32 id,
enum usb_dr_mode dr_mode, 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_ON(1);
return;
}
val = readl(usb_ctrl->phy_reg + reg);
if (on) {
if (dr_mode == USB_DR_MODE_HOST) {
val &= ~(USBPHY_CM_PWRDN | USBPHY_OTG_PWRDN |
USBPHY_OTGVDET_EN);
val |= USBPHY_OTGSESSEND_EN;
} else {
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);
/*
* Give the PHY ~1ms to complete the power up operation.
* Tests have shown unstable behaviour if other USB PHY related
* registers are written too shortly after such a transition.
*/
if (on)
mdelay(1);
}
static const struct phy_control ctrl_am335x = {
.phy_power = am335x_phy_power,
.phy_wkup = am335x_phy_wkup,
};
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, const void *data)
{
const struct device_node *node = (const 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);
of_node_put(node);
if (!dev)
return NULL;
ctrl_usb = dev_get_drvdata(dev);
put_device(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)
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);
res = platform_get_resource_byname(pdev, IORESOURCE_MEM, "wakeup");
ctrl_usb->wkup = devm_ioremap_resource(&pdev->dev, res);
if (IS_ERR(ctrl_usb->wkup))
return PTR_ERR(ctrl_usb->wkup);
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",
.of_match_table = omap_control_usb_id_table,
},
};
module_platform_driver(am335x_control_driver);
MODULE_LICENSE("GPL v2");