/* 
 * USRP - Universal Software Radio Peripheral
 *
 * Copyright (C) 2003,2004 Free Software Foundation, Inc.
 *
 * 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; either version 3 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin Street, Boston, MA  02110-1301  USA
 */

#include "usrp_common.h"
#include "usrp_commands.h"
#include "fpga.h"
#include "timer.h"
#include "i2c.h"
#include "isr.h"
#include "usb_common.h"
#include "fx2utils.h"
#include "usrp_globals.h"
#include "usrp_i2c_addr.h"
#include <string.h>
#include "eeprom_io.h"
#include "usb_descriptors.h"

/*
 * offsets into boot eeprom for configuration values
 */
#define	HW_REV_OFFSET		  5
#define SERIAL_NO_OFFSET	247
#define SERIAL_NO_LEN		  9


#define	bRequestType	SETUPDAT[0]
#define	bRequest	SETUPDAT[1]
#define	wValueL		SETUPDAT[2]
#define	wValueH		SETUPDAT[3]
#define	wIndexL		SETUPDAT[4]
#define	wIndexH		SETUPDAT[5]
#define	wLengthL	SETUPDAT[6]
#define	wLengthH	SETUPDAT[7]


unsigned char g_tx_enable = 0;
unsigned char g_rx_enable = 0;
unsigned char g_rx_overrun = 0;
unsigned char g_tx_underrun = 0;
__bit enable_gpif = 0;

/*
 * the host side fpga loader code pushes an MD5 hash of the bitstream
 * into hash1.
 */
#define	  USRP_HASH_SIZE      16
__xdata __at (USRP_HASH_SLOT_1_ADDR) unsigned char hash1[USRP_HASH_SIZE];

//void clear_fpga_data_fifo(void);

//use the B100 fpga_config_cclk/ext_reset line to reset the FPGA
void fpga_reset(int level) {
    bitALTERA_DCLK = level;
}

static void
get_ep0_data (void)
{
  EP0BCL = 0;			// arm EP0 for OUT xfer.  This sets the busy bit

  while (EP0CS & bmEPBUSY)	// wait for busy to clear
    ;
}

static void clear_fifo(int ep) {
  FIFORESET = 0x80; SYNCDELAY; //activate NAKALL
  FIFORESET = ep; SYNCDELAY;
  FIFORESET = 0x00; SYNCDELAY;
}

void enable_xfers(int enable) {
    if(enable) {
        IFCONFIG = bmIFCLKSRC | bm3048MHZ | bmIFCLKOE | bmIFSLAVE;
    } else {
        IFCONFIG = bmIFCLKSRC | bm3048MHZ | bmIFSLAVE;
    }
    set_led_0(enable);
}

/*
 * Handle our "Vendor Extension" commands on endpoint 0.
 * If we handle this one, return non-zero.
 */
unsigned char
app_vendor_cmd (void)
{
  if (bRequestType == VRT_VENDOR_IN){

    /////////////////////////////////
    //    handle the IN requests
    /////////////////////////////////

    switch (bRequest){

    case VRQ_GET_STATUS: //this is no longer done via FX2 -- the FPGA will be queried instead
      return 0;
      break;

    case VRQ_I2C_READ:
      if (!i2c_read (wValueL, EP0BUF, wLengthL)) return 0;
        EP0BCH = 0;
        EP0BCL = wLengthL;
        break;
      
    case VRQ_SPI_READ:
      return 0;

    case VRQ_FW_COMPAT:
        EP0BCH = 0;
        EP0BCL = 4;
        break;

    default:
      return 0;
    }
  }

  else if (bRequestType == VRT_VENDOR_OUT){

    /////////////////////////////////
    //    handle the OUT requests
    /////////////////////////////////

    switch (bRequest){

    case VRQ_SET_LED:
      switch (wIndexL){
      case 0:
        set_led_0 (wValueL);
        break;
	
      case 1:
        set_led_1 (wValueL);
        break;
	
      default:
        return 0;
      }
      break;
      
    case VRQ_FPGA_LOAD:
      switch (wIndexL){			// sub-command
      case FL_BEGIN:
        return fpga_load_begin ();
	
      case FL_XFER:
        get_ep0_data ();
        return fpga_load_xfer (EP0BUF, EP0BCL);
	
      case FL_END:
        return fpga_load_end ();
	
      default:
        return 0;
      }
      break;

    case VRQ_FPGA_SET_RESET:
      fpga_reset(wValueL);
      break;

    case VRQ_I2C_WRITE:
      get_ep0_data ();
      if (!i2c_write (wValueL, EP0BUF, EP0BCL)) return 0;
      //USRP_LED_REG ^= bmLED1;
      break;
      
    case VRQ_RESET_GPIF:
      clear_fifo(wValueL);
      break;
      
    case VRQ_ENABLE_GPIF:
      enable_xfers(wValueL);
      break;
    
    case VRQ_CLEAR_FPGA_FIFO:
        //clear_fpga_data_fifo();
        break;

    default:
      return 0;
    }

  }
  else
    return 0;    // invalid bRequestType

  return 1;
}

static void
main_loop (void)
{
  while (1){
    if (usb_setup_packet_avail ())
      usb_handle_setup_packet ();
  }
}

/*
 * called at 100 Hz from timer2 interrupt
 *
 * Toggle led 0
 */
void
isr_tick (void) __interrupt
{
  static unsigned char	count = 1;
  
  if (--count == 0){
    count = 50;
    USRP_LED_REG ^= bmLED0;
  }

  clear_timer_irq ();
}

/*
 * Read h/w rev code and serial number out of boot eeprom and
 * patch the usb descriptors with the values.
 */
void
patch_usb_descriptors(void)
{
  static __xdata unsigned char hw_rev;
  static __xdata unsigned char serial_no[SERIAL_NO_LEN];
  unsigned char i;

  eeprom_read(I2C_ADDR_BOOT, HW_REV_OFFSET, &hw_rev, 1);	// LSB of device id
  usb_desc_hw_rev_binary_patch_location_0[0] = hw_rev;
  usb_desc_hw_rev_binary_patch_location_1[0] = hw_rev;
  usb_desc_hw_rev_ascii_patch_location_0[0] = hw_rev + '0';     // FIXME if we get > 9

  eeprom_read(I2C_ADDR_BOOT, SERIAL_NO_OFFSET, serial_no, SERIAL_NO_LEN);

  for (i = 0; i < SERIAL_NO_LEN; i++){
    unsigned char ch = serial_no[i];
    if (ch == 0xff)	// make unprogrammed EEPROM default to '0'
      ch = '0';
    usb_desc_serial_number_ascii[i << 1] = ch;
  }
}

void
main (void)
{
  memset (hash1, 0, USRP_HASH_SIZE);	// zero fpga bitstream hash.  This forces reload
  
  init_usrp ();

  set_led_0 (0);
  set_led_1 (0);
  
  EA = 0;		// disable all interrupts

  patch_usb_descriptors();

  setup_autovectors ();
  usb_install_handlers ();
  //hook_timer_tick ((unsigned short) isr_tick);

  EIEX4 = 1;		// disable INT4 FIXME
  EA = 1;		// global interrupt enable

  fx2_renumerate ();	// simulates disconnect / reconnect
  
  main_loop ();
}