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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
/*
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* Provides code common for host and device side USB.
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License as
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* published by the Free Software Foundation, version 2.
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*
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* If either host side (ie. CONFIG_USB=y) or device side USB stack
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* (ie. CONFIG_USB_GADGET=y) is compiled in the kernel, this module is
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* compiled-in as well. Otherwise, if either of the two stacks is
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* compiled as module, this file is compiled as module as well.
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*/
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#include <linux/kernel.h>
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#include <linux/module.h>
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#include <linux/of.h>
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#include <linux/usb/ch9.h>
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#include <linux/usb/of.h>
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#include <linux/usb/otg.h>
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const char *usb_otg_state_string(enum usb_otg_state state)
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{
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static const char *const names[] = {
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[OTG_STATE_A_IDLE] = "a_idle",
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[OTG_STATE_A_WAIT_VRISE] = "a_wait_vrise",
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[OTG_STATE_A_WAIT_BCON] = "a_wait_bcon",
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[OTG_STATE_A_HOST] = "a_host",
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[OTG_STATE_A_SUSPEND] = "a_suspend",
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[OTG_STATE_A_PERIPHERAL] = "a_peripheral",
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[OTG_STATE_A_WAIT_VFALL] = "a_wait_vfall",
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[OTG_STATE_A_VBUS_ERR] = "a_vbus_err",
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[OTG_STATE_B_IDLE] = "b_idle",
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[OTG_STATE_B_SRP_INIT] = "b_srp_init",
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[OTG_STATE_B_PERIPHERAL] = "b_peripheral",
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[OTG_STATE_B_WAIT_ACON] = "b_wait_acon",
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[OTG_STATE_B_HOST] = "b_host",
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};
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if (state < 0 || state >= ARRAY_SIZE(names))
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return "UNDEFINED";
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return names[state];
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}
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EXPORT_SYMBOL_GPL(usb_otg_state_string);
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static const char *const speed_names[] = {
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[USB_SPEED_UNKNOWN] = "UNKNOWN",
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[USB_SPEED_LOW] = "low-speed",
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[USB_SPEED_FULL] = "full-speed",
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[USB_SPEED_HIGH] = "high-speed",
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[USB_SPEED_WIRELESS] = "wireless",
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[USB_SPEED_SUPER] = "super-speed",
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};
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const char *usb_speed_string(enum usb_device_speed speed)
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{
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if (speed < 0 || speed >= ARRAY_SIZE(speed_names))
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speed = USB_SPEED_UNKNOWN;
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return speed_names[speed];
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}
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EXPORT_SYMBOL_GPL(usb_speed_string);
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const char *usb_state_string(enum usb_device_state state)
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{
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static const char *const names[] = {
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[USB_STATE_NOTATTACHED] = "not attached",
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[USB_STATE_ATTACHED] = "attached",
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[USB_STATE_POWERED] = "powered",
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[USB_STATE_RECONNECTING] = "reconnecting",
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[USB_STATE_UNAUTHENTICATED] = "unauthenticated",
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[USB_STATE_DEFAULT] = "default",
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[USB_STATE_ADDRESS] = "addresssed",
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[USB_STATE_CONFIGURED] = "configured",
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[USB_STATE_SUSPENDED] = "suspended",
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};
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if (state < 0 || state >= ARRAY_SIZE(names))
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return "UNKNOWN";
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return names[state];
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}
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EXPORT_SYMBOL_GPL(usb_state_string);
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#ifdef CONFIG_OF
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static const char *const usb_dr_modes[] = {
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[USB_DR_MODE_UNKNOWN] = "",
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[USB_DR_MODE_HOST] = "host",
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[USB_DR_MODE_PERIPHERAL] = "peripheral",
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[USB_DR_MODE_OTG] = "otg",
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};
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/**
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* of_usb_get_dr_mode - Get dual role mode for given device_node
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* @np: Pointer to the given device_node
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*
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* The function gets phy interface string from property 'dr_mode',
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* and returns the correspondig enum usb_dr_mode
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*/
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enum usb_dr_mode of_usb_get_dr_mode(struct device_node *np)
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{
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const char *dr_mode;
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int err, i;
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err = of_property_read_string(np, "dr_mode", &dr_mode);
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if (err < 0)
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return USB_DR_MODE_UNKNOWN;
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for (i = 0; i < ARRAY_SIZE(usb_dr_modes); i++)
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if (!strcmp(dr_mode, usb_dr_modes[i]))
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return i;
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return USB_DR_MODE_UNKNOWN;
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}
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EXPORT_SYMBOL_GPL(of_usb_get_dr_mode);
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/**
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* of_usb_get_maximum_speed - Get maximum requested speed for a given USB
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* controller.
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* @np: Pointer to the given device_node
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*
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* The function gets the maximum speed string from property "maximum-speed",
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* and returns the corresponding enum usb_device_speed.
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*/
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enum usb_device_speed of_usb_get_maximum_speed(struct device_node *np)
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{
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const char *maximum_speed;
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int err;
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int i;
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err = of_property_read_string(np, "maximum-speed", &maximum_speed);
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if (err < 0)
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return USB_SPEED_UNKNOWN;
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for (i = 0; i < ARRAY_SIZE(speed_names); i++)
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if (strcmp(maximum_speed, speed_names[i]) == 0)
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return i;
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return USB_SPEED_UNKNOWN;
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}
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EXPORT_SYMBOL_GPL(of_usb_get_maximum_speed);
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#endif
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MODULE_LICENSE("GPL");
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