/* 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 USBHostDriver; 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; setup_t setup; //USBHostDriver *driver[6]; USBHostDriver *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]; void *callback_object; // TODO: C++ callbacks?? 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; uint32_t unused[3]; }; /************************************************/ /* 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 new_Transfer(Pipe_t *pipe, void *buffer, uint32_t len); 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(USBHostDriver *driver); private: static void isr(); 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 Drivers */ /************************************************/ class USBHostDriver : public USBHost { public: virtual bool claim_device(Device_t *device, const uint8_t *descriptors) { return false; } virtual bool claim_interface(Device_t *device, const uint8_t *descriptors) { return false; } virtual bool control_callback(const Transfer_t *transfer) { return false; } virtual void disconnect() { } USBHostDriver *next; }; class USBHub : public USBHostDriver { public: USBHub(); virtual bool claim_device(Device_t *device, const uint8_t *descriptors); virtual bool control_callback(const Transfer_t *transfer); setup_t setup; uint8_t hub_desc[12]; }; #endif