linux/drivers/usb/roles/intel-xhci-usb-role-switch.c
Heikki Krogerus bce3052f0c usb: roles: Provide the switch drivers handle to the switch in the API
The USB role callback functions had a parameter pointing to
the parent device (struct device) of the switch. The
assumption was that the switch parent is always the
controller. Firstly, that may not be true in every case, and
secondly, it prevents us from supporting devices that supply
multiple muxes.

Changing the first parameter of usb_role_switch_set_t and
usb_role_switch_get_t from struct device to struct
usb_role_switch.

Cc: Peter Chen <Peter.Chen@nxp.com>
Cc: Felipe Balbi <balbi@kernel.org>
Cc: Chunfeng Yun <chunfeng.yun@mediatek.com>
Cc: Bin Liu <b-liu@ti.com>
Signed-off-by: Heikki Krogerus <heikki.krogerus@linux.intel.com>
Link: https://lore.kernel.org/r/20200302135353.56659-6-heikki.krogerus@linux.intel.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2020-03-04 11:12:50 +01:00

230 lines
5.5 KiB
C

// SPDX-License-Identifier: GPL-2.0+
/*
* Intel XHCI (Cherry Trail, Broxton and others) USB OTG role switch driver
*
* Copyright (c) 2016-2017 Hans de Goede <hdegoede@redhat.com>
*
* Loosely based on android x86 kernel code which is:
*
* Copyright (C) 2014 Intel Corp.
*
* Author: Wu, Hao
*/
#include <linux/acpi.h>
#include <linux/delay.h>
#include <linux/err.h>
#include <linux/io.h>
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/platform_device.h>
#include <linux/pm_runtime.h>
#include <linux/property.h>
#include <linux/usb/role.h>
/* register definition */
#define DUAL_ROLE_CFG0 0x68
#define SW_VBUS_VALID BIT(24)
#define SW_IDPIN_EN BIT(21)
#define SW_IDPIN BIT(20)
#define SW_SWITCH_EN BIT(16)
#define DRD_CONFIG_DYNAMIC 0
#define DRD_CONFIG_STATIC_HOST 1
#define DRD_CONFIG_STATIC_DEVICE 2
#define DRD_CONFIG_MASK 3
#define DUAL_ROLE_CFG1 0x6c
#define HOST_MODE BIT(29)
#define DUAL_ROLE_CFG1_POLL_TIMEOUT 1000
#define DRV_NAME "intel_xhci_usb_sw"
struct intel_xhci_usb_data {
struct device *dev;
struct usb_role_switch *role_sw;
void __iomem *base;
bool enable_sw_switch;
};
static const struct software_node intel_xhci_usb_node = {
"intel-xhci-usb-sw",
};
static int intel_xhci_usb_set_role(struct usb_role_switch *sw,
enum usb_role role)
{
struct intel_xhci_usb_data *data = usb_role_switch_get_drvdata(sw);
unsigned long timeout;
acpi_status status;
u32 glk, val;
u32 drd_config = DRD_CONFIG_DYNAMIC;
/*
* On many CHT devices ACPI event (_AEI) handlers read / modify /
* write the cfg0 register, just like we do. Take the ACPI lock
* to avoid us racing with the AML code.
*/
status = acpi_acquire_global_lock(ACPI_WAIT_FOREVER, &glk);
if (ACPI_FAILURE(status) && status != AE_NOT_CONFIGURED) {
dev_err(data->dev, "Error could not acquire lock\n");
return -EIO;
}
pm_runtime_get_sync(data->dev);
/*
* Set idpin value as requested.
* Since some devices rely on firmware setting DRD_CONFIG and
* SW_SWITCH_EN bits to be zero for role switch,
* do not set these bits for those devices.
*/
val = readl(data->base + DUAL_ROLE_CFG0);
switch (role) {
case USB_ROLE_NONE:
val |= SW_IDPIN;
val &= ~SW_VBUS_VALID;
drd_config = DRD_CONFIG_DYNAMIC;
break;
case USB_ROLE_HOST:
val &= ~SW_IDPIN;
val &= ~SW_VBUS_VALID;
drd_config = DRD_CONFIG_STATIC_HOST;
break;
case USB_ROLE_DEVICE:
val |= SW_IDPIN;
val |= SW_VBUS_VALID;
drd_config = DRD_CONFIG_STATIC_DEVICE;
break;
}
val |= SW_IDPIN_EN;
if (data->enable_sw_switch) {
val &= ~DRD_CONFIG_MASK;
val |= SW_SWITCH_EN | drd_config;
}
writel(val, data->base + DUAL_ROLE_CFG0);
acpi_release_global_lock(glk);
/* In most case it takes about 600ms to finish mode switching */
timeout = jiffies + msecs_to_jiffies(DUAL_ROLE_CFG1_POLL_TIMEOUT);
/* Polling on CFG1 register to confirm mode switch.*/
do {
val = readl(data->base + DUAL_ROLE_CFG1);
if (!!(val & HOST_MODE) == (role == USB_ROLE_HOST)) {
pm_runtime_put(data->dev);
return 0;
}
/* Interval for polling is set to about 5 - 10 ms */
usleep_range(5000, 10000);
} while (time_before(jiffies, timeout));
pm_runtime_put(data->dev);
dev_warn(data->dev, "Timeout waiting for role-switch\n");
return -ETIMEDOUT;
}
static enum usb_role intel_xhci_usb_get_role(struct usb_role_switch *sw)
{
struct intel_xhci_usb_data *data = usb_role_switch_get_drvdata(sw);
enum usb_role role;
u32 val;
pm_runtime_get_sync(data->dev);
val = readl(data->base + DUAL_ROLE_CFG0);
pm_runtime_put(data->dev);
if (!(val & SW_IDPIN))
role = USB_ROLE_HOST;
else if (val & SW_VBUS_VALID)
role = USB_ROLE_DEVICE;
else
role = USB_ROLE_NONE;
return role;
}
static int intel_xhci_usb_probe(struct platform_device *pdev)
{
struct usb_role_switch_desc sw_desc = { };
struct device *dev = &pdev->dev;
struct intel_xhci_usb_data *data;
struct resource *res;
int ret;
data = devm_kzalloc(dev, sizeof(*data), GFP_KERNEL);
if (!data)
return -ENOMEM;
res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
if (!res)
return -EINVAL;
data->base = devm_ioremap(dev, res->start, resource_size(res));
if (!data->base)
return -ENOMEM;
platform_set_drvdata(pdev, data);
ret = software_node_register(&intel_xhci_usb_node);
if (ret)
return ret;
sw_desc.set = intel_xhci_usb_set_role,
sw_desc.get = intel_xhci_usb_get_role,
sw_desc.allow_userspace_control = true,
sw_desc.fwnode = software_node_fwnode(&intel_xhci_usb_node);
sw_desc.driver_data = data;
data->dev = dev;
data->enable_sw_switch = !device_property_read_bool(dev,
"sw_switch_disable");
data->role_sw = usb_role_switch_register(dev, &sw_desc);
if (IS_ERR(data->role_sw)) {
fwnode_handle_put(sw_desc.fwnode);
return PTR_ERR(data->role_sw);
}
pm_runtime_set_active(dev);
pm_runtime_enable(dev);
return 0;
}
static int intel_xhci_usb_remove(struct platform_device *pdev)
{
struct intel_xhci_usb_data *data = platform_get_drvdata(pdev);
pm_runtime_disable(&pdev->dev);
usb_role_switch_unregister(data->role_sw);
fwnode_handle_put(software_node_fwnode(&intel_xhci_usb_node));
return 0;
}
static const struct platform_device_id intel_xhci_usb_table[] = {
{ .name = DRV_NAME },
{}
};
MODULE_DEVICE_TABLE(platform, intel_xhci_usb_table);
static struct platform_driver intel_xhci_usb_driver = {
.driver = {
.name = DRV_NAME,
},
.id_table = intel_xhci_usb_table,
.probe = intel_xhci_usb_probe,
.remove = intel_xhci_usb_remove,
};
module_platform_driver(intel_xhci_usb_driver);
MODULE_AUTHOR("Hans de Goede <hdegoede@redhat.com>");
MODULE_DESCRIPTION("Intel XHCI USB role switch driver");
MODULE_LICENSE("GPL");