src/host/hcd.h

/*
 * SPDX-FileCopyrightText: Copyright (c) 2019 Ha Thach (tinyusb.org)
 * SPDX-License-Identifier: MIT
 *
 * This file is part of the TinyUSB stack.
 */

#ifndef TUSB_HCD_H_
#define TUSB_HCD_H_

#include "common/tusb_common.h"
#include "osal/osal.h"
#include "common/tusb_fifo.h"

#ifdef __cplusplus
 extern "C" {
#endif

//--------------------------------------------------------------------+
// Configuration
//--------------------------------------------------------------------+

// Max number of endpoints pair per device
// TODO optimize memory usage
#ifndef CFG_TUH_ENDPOINT_MAX
  #define CFG_TUH_ENDPOINT_MAX   16
//  #ifdef TUP_HCD_ENDPOINT_MAX
//    #define CFG_TUH_ENDPPOINT_MAX   TUP_HCD_ENDPOINT_MAX
//  #else
//    #define
//  #endif
#endif

//--------------------------------------------------------------------+
// MACRO CONSTANT TYPEDEF
//--------------------------------------------------------------------+
typedef enum {
  HCD_EVENT_DEVICE_ATTACH,
  HCD_EVENT_DEVICE_REMOVE,
  HCD_EVENT_XFER_COMPLETE,

  USBH_EVENT_FUNC_CALL, // Not an HCD event
  HCD_EVENT_INVALID
} hcd_eventid_t;

typedef struct {
  uint8_t rhport;
  uint8_t event_id;
  uint8_t dev_addr;

  union {
    // Attach, Remove
    struct {
      uint8_t hub_addr;
      uint8_t hub_port;
    } connection;

    // XFER_COMPLETE
    struct {
      uint8_t ep_addr;
      uint8_t result;
      uint32_t len;
    } xfer_complete;

    // FUNC_CALL
    struct {
      void (*func) (void* param);
      void* param;
    }func_call;
  };
} hcd_event_t;

//--------------------------------------------------------------------+
// Memory API
//--------------------------------------------------------------------+

// clean/flush data cache: write cache -> memory.
// Required before an DMA TX transfer to make sure data is in memory
bool hcd_dcache_clean(void const* addr, uint32_t data_size);

// invalidate data cache: mark cache as invalid, next read will read from memory
// Required BOTH before and after an DMA RX transfer
bool hcd_dcache_invalidate(void const* addr, uint32_t data_size);

// clean and invalidate data cache
// Required before an DMA transfer where memory is both read/write by DMA
bool hcd_dcache_clean_invalidate(void const* addr, uint32_t data_size);

//--------------------------------------------------------------------+
// Controller API
//--------------------------------------------------------------------+

// optional hcd configuration, called by tuh_configure()
bool hcd_configure(uint8_t rhport, uint32_t cfg_id, const void* cfg_param);

// Initialize controller to host mode
bool hcd_init(uint8_t rhport, const tusb_rhport_init_t* rh_init);

// De-initialize controller
bool hcd_deinit(uint8_t rhport);

// Interrupt Handler
void hcd_int_handler(uint8_t rhport, bool in_isr);

// Enable USB interrupt
void hcd_int_enable (uint8_t rhport);

// Disable USB interrupt
void hcd_int_disable(uint8_t rhport);

// Get frame number (1ms)
uint32_t hcd_frame_number(uint8_t rhport);

//--------------------------------------------------------------------+
// Port API
//--------------------------------------------------------------------+

// Get the current connect status of roothub port
bool hcd_port_connect_status(uint8_t rhport);

// Reset USB bus on the port. Return immediately, bus reset sequence may not be complete.
// Some port would require hcd_port_reset_end() to be invoked after 10ms to complete the reset sequence.
void hcd_port_reset(uint8_t rhport);

// Complete bus reset sequence, may be required by some controllers
void hcd_port_reset_end(uint8_t rhport);

// Get port link speed
tusb_speed_t hcd_port_speed_get(uint8_t rhport);

// HCD closes all opened endpoints belong to this device
void hcd_device_close(uint8_t rhport, uint8_t dev_addr);

//--------------------------------------------------------------------+
// Endpoints API
//--------------------------------------------------------------------+

// Open an endpoint
// return true if successfully opened or endpoint is currently opened
bool hcd_edpt_open(uint8_t rhport, uint8_t daddr, tusb_desc_endpoint_t const * ep_desc);

// Close an endpoint
bool hcd_edpt_close(uint8_t rhport, uint8_t daddr, uint8_t ep_addr);

// Submit a transfer, when complete hcd_event_xfer_complete() must be invoked
bool hcd_edpt_xfer(uint8_t rhport, uint8_t daddr, uint8_t ep_addr, uint8_t * buffer, uint16_t buflen);

// Abort a queued transfer. Note: it can only abort transfer that has not been started
// Return true if a queued transfer is aborted, false if there is no transfer to abort
bool hcd_edpt_abort_xfer(uint8_t rhport, uint8_t dev_addr, uint8_t ep_addr);

// Submit a special transfer to send 8-byte Setup Packet, when complete hcd_event_xfer_complete() must be invoked
bool hcd_setup_send(uint8_t rhport, uint8_t daddr, uint8_t const setup_packet[8]);

// clear stall, data toggle is also reset to DATA0
bool hcd_edpt_clear_stall(uint8_t rhport, uint8_t dev_addr, uint8_t ep_addr);

//--------------------------------------------------------------------+
// USBH implemented API
//--------------------------------------------------------------------+

// Called by HCD to notify stack
extern void hcd_event_handler(hcd_event_t const* event, bool in_isr);

// Helper to send device attach event
TU_ATTR_ALWAYS_INLINE static inline
void hcd_event_device_attach(uint8_t rhport, bool in_isr) {
  hcd_event_t event;
  event.rhport              = rhport;
  event.event_id            = HCD_EVENT_DEVICE_ATTACH;
  event.connection.hub_addr = 0;
  event.connection.hub_port = 0;

  hcd_event_handler(&event, in_isr);
}

// Helper to send device removal event
TU_ATTR_ALWAYS_INLINE static inline
void hcd_event_device_remove(uint8_t rhport, bool in_isr) {
  hcd_event_t event;
  event.rhport              = rhport;
  event.event_id            = HCD_EVENT_DEVICE_REMOVE;
  event.connection.hub_addr = 0;
  event.connection.hub_port = 0;

  hcd_event_handler(&event, in_isr);
}

// Helper to send USB transfer event
TU_ATTR_ALWAYS_INLINE static inline
void hcd_event_xfer_complete(uint8_t dev_addr, uint8_t ep_addr, uint32_t xferred_bytes, xfer_result_t result, bool in_isr) {
  hcd_event_t event = {
    .rhport   = 0, // TODO correct rhport
    .event_id = HCD_EVENT_XFER_COMPLETE,
    .dev_addr = dev_addr,
  };
  event.xfer_complete.ep_addr = ep_addr;
  event.xfer_complete.result = result;
  event.xfer_complete.len = xferred_bytes;

  hcd_event_handler(&event, in_isr);
}

#ifdef __cplusplus
 }
#endif

#endif