/* USB EHCI Host for Teensy 3.6 * Copyright 2017 Paul Stoffregen (paul@pjrc.com) * * Permission is hereby granted, free of charge, to any person obtaining a * copy of this software and associated documentation files (the * "Software"), to deal in the Software without restriction, including * without limitation the rights to use, copy, modify, merge, publish, * distribute, sublicense, and/or sell copies of the Software, and to * permit persons to whom the Software is furnished to do so, subject to * the following conditions: * * The above copyright notice and this permission notice shall be included * in all copies or substantial portions of the Software. * * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. * IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY * CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, * TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE * SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE. */ #ifndef USB_HOST_TEENSY36_ #define USB_HOST_TEENSY36_ #include /************************************************/ /* Data Structure Definitions */ /************************************************/ class USBHost; class USBDriver; typedef struct Device_struct Device_t; typedef struct Pipe_struct Pipe_t; typedef struct Transfer_struct Transfer_t; // setup_t holds the 8 byte USB SETUP packet data. // These unions & structs allow convenient access to // the setup fields. typedef union { struct { union { struct { uint8_t bmRequestType; uint8_t bRequest; }; uint16_t wRequestAndType; }; uint16_t wValue; uint16_t wIndex; uint16_t wLength; }; struct { uint32_t word1; uint32_t word2; }; } setup_t; // Device_t holds all the information about a USB device struct Device_struct { Pipe_t *control_pipe; Device_t *next; USBDriver *drivers; uint8_t speed; // 0=12, 1=1.5, 2=480 Mbit/sec uint8_t address; uint8_t hub_address; uint8_t hub_port; uint8_t enum_state; uint8_t bDeviceClass; uint8_t bDeviceSubClass; uint8_t bDeviceProtocol; uint8_t bmAttributes; uint8_t bMaxPower; uint16_t idVendor; uint16_t idProduct; uint16_t LanguageID; }; // Pipe_t holes all information about each USB endpoint/pipe // The first half is an EHCI QH structure for the pipe. struct Pipe_struct { // Queue Head (QH), EHCI page 46-50 struct { // must be aligned to 32 byte boundary volatile uint32_t horizontal_link; volatile uint32_t capabilities[2]; volatile uint32_t current; volatile uint32_t next; volatile uint32_t alt_next; volatile uint32_t token; volatile uint32_t buffer[5]; } qh; Device_t *device; uint8_t type; // 0=control, 1=isochronous, 2=bulk, 3=interrupt uint8_t direction; // 0=out, 1=in (changes for control, others fixed) uint8_t unusedbyte[2]; USBDriver *callback_object; void (*callback_function)(const Transfer_t *); }; // Transfer_t represents a single transaction on the USB bus. // The first portion is an EHCI qTD structure. Transfer_t are // allocated as-needed from a memory pool, loaded with pointers // to the actual data buffers, linked into a followup list, // and placed on ECHI Queue Heads. When the ECHI interrupt // occurs, the followup lists are used to find the Transfer_t // in memory. Callbacks are made, and then the Transfer_t are // returned to the memory pool. struct Transfer_struct { // Queue Element Transfer Descriptor (qTD), EHCI pg 40-45 struct { // must be aligned to 32 byte boundary volatile uint32_t next; volatile uint32_t alt_next; volatile uint32_t token; volatile uint32_t buffer[5]; } qtd; // Linked list of queued, not-yet-completed transfers Transfer_t *next_followup; Transfer_t *prev_followup; // Data to be used by callback function. When a group // of Transfer_t are created, these fields and the // interrupt-on-complete bit in the qTD token are only // set in the last Transfer_t of the list. Pipe_t *pipe; void *buffer; uint32_t length; setup_t *setup; USBDriver *driver; uint32_t unused; }; /************************************************/ /* Main USB EHCI Controller */ /************************************************/ class USBHost { public: static void begin(); protected: static Pipe_t * new_Pipe(Device_t *dev, uint32_t type, uint32_t endpoint, uint32_t direction, uint32_t max_packet_len); static bool queue_Control_Transfer(Device_t *dev, setup_t *setup, void *buf, USBDriver *driver); static bool queue_Data_Transfer(Pipe_t *pipe, void *buffer, uint32_t len, USBDriver *driver); static Device_t * new_Device(uint32_t speed, uint32_t hub_addr, uint32_t hub_port); static void enumeration(const Transfer_t *transfer); static void driver_ready_for_device(USBDriver *driver); private: static void isr(); static void claim_drivers(Device_t *dev); static bool queue_Transfer(Pipe_t *pipe, Transfer_t *transfer); static void init_Device_Pipe_Transfer_memory(void); static Device_t * allocate_Device(void); static void free_Device(Device_t *q); static Pipe_t * allocate_Pipe(void); static void free_Pipe(Pipe_t *q); static Transfer_t * allocate_Transfer(void); static void free_Transfer(Transfer_t *q); protected: static void print(const Transfer_t *transfer); static void print(const Transfer_t *first, const Transfer_t *last); static void print_token(uint32_t token); static void print(const Pipe_t *pipe); static void print_hexbytes(const void *ptr, uint32_t len); static void print(const char *s); static void print(const char *s, int num); static void mk_setup(setup_t &s, uint32_t bmRequestType, uint32_t bRequest, uint32_t wValue, uint32_t wIndex, uint32_t wLength) { s.word1 = bmRequestType | (bRequest << 8) | (wValue << 16); s.word2 = wIndex | (wLength << 16); } }; /************************************************/ /* USB Device Driver Common Base Class */ /************************************************/ // All USB device drivers inherit from this base class. class USBDriver : public USBHost { protected: USBDriver() : next(NULL), device(NULL) {} // Check if a driver wishes to claim a device or interface or group // of interfaces within a device. When this function returns true, // the driver is considered bound or loaded for that device. When // new devices are detected, enumeration.cpp calls this function on // all unbound driver objects, to give them an opportunity to bind // to the new device. // device has its vid&pid, class/subclass fields initialized // type is 0 for device level, 1 for interface level, 2 for IAD // descriptors points to the specific descriptor data virtual bool claim(Device_t *device, int type, const uint8_t *descriptors) { return false; } // When an unknown (not chapter 9) control transfer completes, this // function is called for all drivers bound to the device. Return // true means this driver originated this control transfer, so no // more drivers need to be offered an opportunity to process it. virtual bool control(const Transfer_t *transfer) { return false; } // When a device disconnects from the USB, this function is called. // The driver must free all resources it has allocated. virtual void disconnect() { } // Drivers are managed by this single-linked list. All inactive // (not bound to any device) drivers are linked from // available_drivers in enumeration.cpp. When bound to a device, // drivers are linked from that Device_t drivers list. USBDriver *next; // When not bound to any device, this must be NULL. Device_t *device; friend class USBHost; public: // TODO: user-level functions // check if device is bound/active/online // query vid, pid // query string: manufacturer, product, serial number }; /************************************************/ /* USB Device Drivers */ /************************************************/ class USBHub : public USBDriver { public: USBHub(); protected: virtual bool claim(Device_t *device, int type, const uint8_t *descriptors); virtual bool control(const Transfer_t *transfer); void poweron(uint32_t port); setup_t setup; uint8_t hub_desc[16]; uint8_t endpoint; uint8_t numports; uint8_t characteristics; uint8_t powertime; uint8_t state; Pipe_t *changepipe; uint32_t changebits; uint32_t status; }; #endif