mirror of
https://github.com/edk2-porting/linux-next.git
synced 2024-12-25 05:34:00 +08:00
1494a1f62b
this helper will be used for controllers which want to work at a lower speed even though they support higher USB transfer rates. One such case is Texas Instruments' AM437x SoC where it uses a USB3 controller without a USB3 PHY, rendering the controller USB2-only. Signed-off-by: Felipe Balbi <balbi@ti.com>
145 lines
3.9 KiB
C
145 lines
3.9 KiB
C
/*
|
|
* Provides code common for host and device side USB.
|
|
*
|
|
* This program is free software; you can redistribute it and/or
|
|
* modify it under the terms of the GNU General Public License as
|
|
* published by the Free Software Foundation, version 2.
|
|
*
|
|
* If either host side (ie. CONFIG_USB=y) or device side USB stack
|
|
* (ie. CONFIG_USB_GADGET=y) is compiled in the kernel, this module is
|
|
* compiled-in as well. Otherwise, if either of the two stacks is
|
|
* compiled as module, this file is compiled as module as well.
|
|
*/
|
|
|
|
#include <linux/kernel.h>
|
|
#include <linux/module.h>
|
|
#include <linux/of.h>
|
|
#include <linux/usb/ch9.h>
|
|
#include <linux/usb/of.h>
|
|
#include <linux/usb/otg.h>
|
|
|
|
const char *usb_otg_state_string(enum usb_otg_state state)
|
|
{
|
|
static const char *const names[] = {
|
|
[OTG_STATE_A_IDLE] = "a_idle",
|
|
[OTG_STATE_A_WAIT_VRISE] = "a_wait_vrise",
|
|
[OTG_STATE_A_WAIT_BCON] = "a_wait_bcon",
|
|
[OTG_STATE_A_HOST] = "a_host",
|
|
[OTG_STATE_A_SUSPEND] = "a_suspend",
|
|
[OTG_STATE_A_PERIPHERAL] = "a_peripheral",
|
|
[OTG_STATE_A_WAIT_VFALL] = "a_wait_vfall",
|
|
[OTG_STATE_A_VBUS_ERR] = "a_vbus_err",
|
|
[OTG_STATE_B_IDLE] = "b_idle",
|
|
[OTG_STATE_B_SRP_INIT] = "b_srp_init",
|
|
[OTG_STATE_B_PERIPHERAL] = "b_peripheral",
|
|
[OTG_STATE_B_WAIT_ACON] = "b_wait_acon",
|
|
[OTG_STATE_B_HOST] = "b_host",
|
|
};
|
|
|
|
if (state < 0 || state >= ARRAY_SIZE(names))
|
|
return "UNDEFINED";
|
|
|
|
return names[state];
|
|
}
|
|
EXPORT_SYMBOL_GPL(usb_otg_state_string);
|
|
|
|
static const char *const speed_names[] = {
|
|
[USB_SPEED_UNKNOWN] = "UNKNOWN",
|
|
[USB_SPEED_LOW] = "low-speed",
|
|
[USB_SPEED_FULL] = "full-speed",
|
|
[USB_SPEED_HIGH] = "high-speed",
|
|
[USB_SPEED_WIRELESS] = "wireless",
|
|
[USB_SPEED_SUPER] = "super-speed",
|
|
};
|
|
|
|
const char *usb_speed_string(enum usb_device_speed speed)
|
|
{
|
|
if (speed < 0 || speed >= ARRAY_SIZE(speed_names))
|
|
speed = USB_SPEED_UNKNOWN;
|
|
return speed_names[speed];
|
|
}
|
|
EXPORT_SYMBOL_GPL(usb_speed_string);
|
|
|
|
const char *usb_state_string(enum usb_device_state state)
|
|
{
|
|
static const char *const names[] = {
|
|
[USB_STATE_NOTATTACHED] = "not attached",
|
|
[USB_STATE_ATTACHED] = "attached",
|
|
[USB_STATE_POWERED] = "powered",
|
|
[USB_STATE_RECONNECTING] = "reconnecting",
|
|
[USB_STATE_UNAUTHENTICATED] = "unauthenticated",
|
|
[USB_STATE_DEFAULT] = "default",
|
|
[USB_STATE_ADDRESS] = "addresssed",
|
|
[USB_STATE_CONFIGURED] = "configured",
|
|
[USB_STATE_SUSPENDED] = "suspended",
|
|
};
|
|
|
|
if (state < 0 || state >= ARRAY_SIZE(names))
|
|
return "UNKNOWN";
|
|
|
|
return names[state];
|
|
}
|
|
EXPORT_SYMBOL_GPL(usb_state_string);
|
|
|
|
#ifdef CONFIG_OF
|
|
static const char *const usb_dr_modes[] = {
|
|
[USB_DR_MODE_UNKNOWN] = "",
|
|
[USB_DR_MODE_HOST] = "host",
|
|
[USB_DR_MODE_PERIPHERAL] = "peripheral",
|
|
[USB_DR_MODE_OTG] = "otg",
|
|
};
|
|
|
|
/**
|
|
* of_usb_get_dr_mode - Get dual role mode for given device_node
|
|
* @np: Pointer to the given device_node
|
|
*
|
|
* The function gets phy interface string from property 'dr_mode',
|
|
* and returns the correspondig enum usb_dr_mode
|
|
*/
|
|
enum usb_dr_mode of_usb_get_dr_mode(struct device_node *np)
|
|
{
|
|
const char *dr_mode;
|
|
int err, i;
|
|
|
|
err = of_property_read_string(np, "dr_mode", &dr_mode);
|
|
if (err < 0)
|
|
return USB_DR_MODE_UNKNOWN;
|
|
|
|
for (i = 0; i < ARRAY_SIZE(usb_dr_modes); i++)
|
|
if (!strcmp(dr_mode, usb_dr_modes[i]))
|
|
return i;
|
|
|
|
return USB_DR_MODE_UNKNOWN;
|
|
}
|
|
EXPORT_SYMBOL_GPL(of_usb_get_dr_mode);
|
|
|
|
/**
|
|
* of_usb_get_maximum_speed - Get maximum requested speed for a given USB
|
|
* controller.
|
|
* @np: Pointer to the given device_node
|
|
*
|
|
* The function gets the maximum speed string from property "maximum-speed",
|
|
* and returns the corresponding enum usb_device_speed.
|
|
*/
|
|
enum usb_device_speed of_usb_get_maximum_speed(struct device_node *np)
|
|
{
|
|
const char *maximum_speed;
|
|
int err;
|
|
int i;
|
|
|
|
err = of_property_read_string(np, "maximum-speed", &maximum_speed);
|
|
if (err < 0)
|
|
return USB_SPEED_UNKNOWN;
|
|
|
|
for (i = 0; i < ARRAY_SIZE(speed_names); i++)
|
|
if (strcmp(maximum_speed, speed_names[i]) == 0)
|
|
return i;
|
|
|
|
return USB_SPEED_UNKNOWN;
|
|
}
|
|
EXPORT_SYMBOL_GPL(of_usb_get_maximum_speed);
|
|
|
|
#endif
|
|
|
|
MODULE_LICENSE("GPL");
|