//
// Copyright 2010-2011 Ettus Research LLC
//
/*
 * Copyright 2007,2008 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, see <http://www.gnu.org/licenses/>.
 */

#ifdef HAVE_CONFIG_H
#include "config.h"
#endif

#include <lwip/ip.h>
#include <lwip/udp.h>
#include "u2_init.h"
#include "memory_map.h"
#include "spi.h"
#include "hal_io.h"
#include "pic.h"
#include <stdbool.h>
#include "ethernet.h"
#include "nonstdio.h"
#include <net/padded_eth_hdr.h>
#include <net_common.h>
#include "memcpy_wa.h"
#include <stddef.h>
#include <stdlib.h>
#include <string.h>
#include "clocks.h"
#include "usrp2/fw_common.h"
#include <i2c.h>
#include <ethertype.h>
#include <arp_cache.h>
#include "udp_fw_update.h"
#include "pkt_ctrl.h"
#include "banal.h"

static void setup_network(void);

// ----------------------------------------------------------------
// the fast-path setup global variables
// ----------------------------------------------------------------
static eth_mac_addr_t fp_mac_addr_src, fp_mac_addr_dst;
extern struct socket_address fp_socket_src, fp_socket_dst;

static void handle_udp_err0_packet(
    struct socket_address src, struct socket_address dst,
    unsigned char *payload, int payload_len
){
    sr_udp_sm->err0_port = (((uint32_t)dst.port) << 16) | src.port;
    printf("Storing for async error path:\n");
    printf("  source udp port: %d\n", dst.port);
    printf("  destination udp port: %d\n", src.port);
    newline();
}

static void handle_udp_data_packet(
    struct socket_address src, struct socket_address dst,
    unsigned char *payload, int payload_len
){
    fp_mac_addr_src = *ethernet_mac_addr();
    arp_cache_lookup_mac(&src.addr, &fp_mac_addr_dst);
    fp_socket_src = dst;
    fp_socket_dst = src;
    sr_udp_sm->dsp0_port = (((uint32_t)dst.port) << 16) | src.port;
    printf("Storing for fast path:\n");
    printf("  source mac addr: ");
    print_mac_addr(&fp_mac_addr_src); newline();
    printf("  source ip addr: ");
    print_ip_addr(&fp_socket_src.addr); newline();
    printf("  source udp port: %d\n", fp_socket_src.port);
    printf("  destination mac addr: ");
    print_mac_addr(&fp_mac_addr_dst); newline();
    printf("  destination ip addr: ");
    print_ip_addr(&fp_socket_dst.addr); newline();
    printf("  destination udp port: %d\n", fp_socket_dst.port);
    newline();

    //setup network
    setup_network();

}

#define OTW_GPIO_BANK_TO_NUM(bank) \
    (((bank) == USRP2_DIR_RX)? (GPIO_RX_BANK) : (GPIO_TX_BANK))

static void handle_udp_ctrl_packet(
    struct socket_address src, struct socket_address dst,
    unsigned char *payload, int payload_len
){
    //printf("Got ctrl packet #words: %d\n", (int)payload_len);
    const usrp2_ctrl_data_t *ctrl_data_in = (usrp2_ctrl_data_t *)payload;
    uint32_t ctrl_data_in_id = ctrl_data_in->id;

    //ensure that the protocol versions match
    if (payload_len >= sizeof(uint32_t) && ctrl_data_in->proto_ver != USRP2_FW_COMPAT_NUM){
        printf("!Error in control packet handler: Expected compatibility number %d, but got %d\n",
            USRP2_FW_COMPAT_NUM, ctrl_data_in->proto_ver
        );
        ctrl_data_in_id = USRP2_CTRL_ID_WAZZUP_BRO;
    }

    //ensure that this is not a short packet
    if (payload_len < sizeof(usrp2_ctrl_data_t)){
        printf("!Error in control packet handler: Expected payload length %d, but got %d\n",
            (int)sizeof(usrp2_ctrl_data_t), payload_len
        );
        ctrl_data_in_id = USRP2_CTRL_ID_HUH_WHAT;
    }

    //setup the output data
    usrp2_ctrl_data_t ctrl_data_out;
    ctrl_data_out.proto_ver = USRP2_FW_COMPAT_NUM;
    ctrl_data_out.id=USRP2_CTRL_ID_HUH_WHAT;
    ctrl_data_out.seq=ctrl_data_in->seq;

    //handle the data based on the id
    switch(ctrl_data_in_id){

    /*******************************************************************
     * Addressing
     ******************************************************************/
    case USRP2_CTRL_ID_WAZZUP_BRO:
        ctrl_data_out.id = USRP2_CTRL_ID_WAZZUP_DUDE;
        memcpy(&ctrl_data_out.data.ip_addr, get_ip_addr(), sizeof(struct ip_addr));
        break;

    /*******************************************************************
     * SPI
     ******************************************************************/
    case USRP2_CTRL_ID_TRANSACT_ME_SOME_SPI_BRO:{
            //transact
            uint32_t result = spi_transact(
                (ctrl_data_in->data.spi_args.readback == 0)? SPI_TXONLY : SPI_TXRX,
                ctrl_data_in->data.spi_args.dev,      //which device
                ctrl_data_in->data.spi_args.data,     //32 bit data
                ctrl_data_in->data.spi_args.num_bits, //length in bits
                (ctrl_data_in->data.spi_args.mosi_edge == USRP2_CLK_EDGE_RISE)? SPIF_PUSH_FALL : SPIF_PUSH_RISE |
                (ctrl_data_in->data.spi_args.miso_edge == USRP2_CLK_EDGE_RISE)? SPIF_LATCH_RISE : SPIF_LATCH_FALL
            );

            //load output
            ctrl_data_out.data.spi_args.data = result;
            ctrl_data_out.id = USRP2_CTRL_ID_OMG_TRANSACTED_SPI_DUDE;
        }
        break;

    /*******************************************************************
     * I2C
     ******************************************************************/
    case USRP2_CTRL_ID_DO_AN_I2C_READ_FOR_ME_BRO:{
            uint8_t num_bytes = ctrl_data_in->data.i2c_args.bytes;
            i2c_read(
                ctrl_data_in->data.i2c_args.addr,
                ctrl_data_out.data.i2c_args.data,
                num_bytes
            );
            ctrl_data_out.id = USRP2_CTRL_ID_HERES_THE_I2C_DATA_DUDE;
            ctrl_data_out.data.i2c_args.bytes = num_bytes;
        }
        break;

    case USRP2_CTRL_ID_WRITE_THESE_I2C_VALUES_BRO:{
            uint8_t num_bytes = ctrl_data_in->data.i2c_args.bytes;
            i2c_write(
                ctrl_data_in->data.i2c_args.addr,
                ctrl_data_in->data.i2c_args.data,
                num_bytes
            );
            ctrl_data_out.id = USRP2_CTRL_ID_COOL_IM_DONE_I2C_WRITE_DUDE;
            ctrl_data_out.data.i2c_args.bytes = num_bytes;
        }
        break;

    /*******************************************************************
     * Peek and Poke Register
     ******************************************************************/
    case USRP2_CTRL_ID_POKE_THIS_REGISTER_FOR_ME_BRO:
        if (0){//ctrl_data_in->data.poke_args.addr < 0xC000){
            printf("error! tried to poke into 0x%x\n", ctrl_data_in->data.poke_args.addr);
        }
        else switch(ctrl_data_in->data.poke_args.num_bytes){
        case sizeof(uint32_t):
            *((uint32_t *) ctrl_data_in->data.poke_args.addr) = (uint32_t)ctrl_data_in->data.poke_args.data;
            break;

        case sizeof(uint16_t):
            *((uint16_t *) ctrl_data_in->data.poke_args.addr) = (uint16_t)ctrl_data_in->data.poke_args.data;
            break;

        case sizeof(uint8_t):
            *((uint8_t *) ctrl_data_in->data.poke_args.addr) = (uint8_t)ctrl_data_in->data.poke_args.data;
            break;

        }
        ctrl_data_out.id = USRP2_CTRL_ID_OMG_POKED_REGISTER_SO_BAD_DUDE;
        break;

    case USRP2_CTRL_ID_PEEK_AT_THIS_REGISTER_FOR_ME_BRO:
        switch(ctrl_data_in->data.poke_args.num_bytes){
        case sizeof(uint32_t):
            ctrl_data_out.data.poke_args.data = *((uint32_t *) ctrl_data_in->data.poke_args.addr);
            break;

        case sizeof(uint16_t):
            ctrl_data_out.data.poke_args.data = *((uint16_t *) ctrl_data_in->data.poke_args.addr);
            break;

        case sizeof(uint8_t):
            ctrl_data_out.data.poke_args.data = *((uint8_t *) ctrl_data_in->data.poke_args.addr);
            break;

        }
        ctrl_data_out.id = USRP2_CTRL_ID_WOAH_I_DEFINITELY_PEEKED_IT_DUDE;
        break;

    case USRP2_CTRL_ID_SO_LIKE_CAN_YOU_READ_THIS_UART_BRO:{
      //executes a readline()-style read, up to num_bytes long, up to and including newline
      int num_bytes = ctrl_data_in->data.uart_args.bytes;
      if(num_bytes > 20) num_bytes = 20;
      num_bytes = fngets_noblock(ctrl_data_in->data.uart_args.dev, (char *) ctrl_data_out.data.uart_args.data, num_bytes);
      ctrl_data_out.id = USRP2_CTRL_ID_I_HELLA_READ_THAT_UART_DUDE;
      ctrl_data_out.data.uart_args.bytes = num_bytes;
      break;
    }

    case USRP2_CTRL_ID_HEY_WRITE_THIS_UART_FOR_ME_BRO:{
      int num_bytes = ctrl_data_in->data.uart_args.bytes;
      if(num_bytes > 20) num_bytes = 20;
      //before we write to the UART, we flush the receive buffer
      //this assumes that we're interested in the reply
      hal_uart_rx_flush(ctrl_data_in->data.uart_args.dev);
      fnputstr(ctrl_data_in->data.uart_args.dev, (char *) ctrl_data_in->data.uart_args.data, num_bytes);
      ctrl_data_out.id = USRP2_CTRL_ID_MAN_I_TOTALLY_WROTE_THAT_UART_DUDE;
      ctrl_data_out.data.uart_args.bytes = num_bytes;
      break;
    }

    default:
        ctrl_data_out.id = USRP2_CTRL_ID_HUH_WHAT;
    }
    send_udp_pkt(USRP2_UDP_CTRL_PORT, src, &ctrl_data_out, sizeof(ctrl_data_out));
}

static void handle_inp_packet(uint32_t *buff, size_t num_lines){

  //test if its an ip recovery packet
  typedef struct{
      padded_eth_hdr_t eth_hdr;
      char code[4];
      union {
        struct ip_addr ip_addr;
      } data;
  }recovery_packet_t;
  recovery_packet_t *recovery_packet = (recovery_packet_t *)buff;
  if (recovery_packet->eth_hdr.ethertype == 0xbeee && strncmp(recovery_packet->code, "addr", 4) == 0){
      printf("Got ip recovery packet: "); print_ip_addr(&recovery_packet->data.ip_addr); newline();
      set_ip_addr(&recovery_packet->data.ip_addr);
      return;
  }

  //pass it to the slow-path handler
  handle_eth_packet(buff, num_lines);
}


//------------------------------------------------------------------

/*
 * Called when eth phy state changes (w/ interrupts disabled)
 */
void link_changed_callback(int speed){
    printf("\neth link changed: speed = %d\n", speed);
    if (speed != 0){
        hal_set_leds(LED_RJ45, LED_RJ45);
        pkt_ctrl_set_routing_mode(PKT_CTRL_ROUTING_MODE_MASTER);
        send_gratuitous_arp();
    }
    else{
        hal_set_leds(0x0, LED_RJ45);
        pkt_ctrl_set_routing_mode(PKT_CTRL_ROUTING_MODE_SLAVE);
    }
}

static void setup_network(void){

  //setup ethernet header machine
  sr_udp_sm->eth_hdr.mac_dst_0_1 = (fp_mac_addr_dst.addr[0] << 8) | fp_mac_addr_dst.addr[1];
  sr_udp_sm->eth_hdr.mac_dst_2_3 = (fp_mac_addr_dst.addr[2] << 8) | fp_mac_addr_dst.addr[3];
  sr_udp_sm->eth_hdr.mac_dst_4_5 = (fp_mac_addr_dst.addr[4] << 8) | fp_mac_addr_dst.addr[5];
  sr_udp_sm->eth_hdr.mac_src_0_1 = (fp_mac_addr_src.addr[0] << 8) | fp_mac_addr_src.addr[1];
  sr_udp_sm->eth_hdr.mac_src_2_3 = (fp_mac_addr_src.addr[2] << 8) | fp_mac_addr_src.addr[3];
  sr_udp_sm->eth_hdr.mac_src_4_5 = (fp_mac_addr_src.addr[4] << 8) | fp_mac_addr_src.addr[5];
  sr_udp_sm->eth_hdr.ether_type = ETHERTYPE_IPV4;

  //setup ip header machine
  unsigned int chksum = 0;
  sr_udp_sm->ip_hdr.ver_ihl_tos = CHKSUM(0x4500, &chksum);    // IPV4,  5 words of header (20 bytes), TOS=0
  sr_udp_sm->ip_hdr.total_length = UDP_SM_INS_IP_LEN;             // Don't checksum this line in SW
  sr_udp_sm->ip_hdr.identification = CHKSUM(0x0000, &chksum);    // ID
  sr_udp_sm->ip_hdr.flags_frag_off = CHKSUM(0x4000, &chksum);    // don't fragment
  sr_udp_sm->ip_hdr.ttl_proto = CHKSUM(0x2011, &chksum);    // TTL=32, protocol = UDP (17 decimal)
  //sr_udp_sm->ip_hdr.checksum .... filled in below
  uint32_t src_ip_addr = fp_socket_src.addr.addr;
  uint32_t dst_ip_addr = fp_socket_dst.addr.addr;
  sr_udp_sm->ip_hdr.src_addr_high = CHKSUM(src_ip_addr >> 16, &chksum);    // IP src high
  sr_udp_sm->ip_hdr.src_addr_low = CHKSUM(src_ip_addr & 0xffff, &chksum); // IP src low
  sr_udp_sm->ip_hdr.dst_addr_high = CHKSUM(dst_ip_addr >> 16, &chksum);    // IP dst high
  sr_udp_sm->ip_hdr.dst_addr_low = CHKSUM(dst_ip_addr & 0xffff, &chksum); // IP dst low
  sr_udp_sm->ip_hdr.checksum = UDP_SM_INS_IP_HDR_CHKSUM | (chksum & 0xffff);

  //setup the udp header machine
  sr_udp_sm->udp_hdr.src_port = UDP_SM_INS_UDP_SRC_PORT;
  sr_udp_sm->udp_hdr.dst_port = UDP_SM_INS_UDP_DST_PORT;
  sr_udp_sm->udp_hdr.length = UDP_SM_INS_UDP_LEN;
  sr_udp_sm->udp_hdr.checksum = UDP_SM_LAST_WORD;		// zero UDP checksum
}

int
main(void)
{
  u2_init();

  putstr("\nTxRx-UHD-ZPU\n");
  print_mac_addr(ethernet_mac_addr()); newline();
  print_ip_addr(get_ip_addr()); newline();
  printf("FPGA compatibility number: %d\n", USRP2_FPGA_COMPAT_NUM);
  printf("Firmware compatibility number: %d\n", USRP2_FW_COMPAT_NUM);

  //1) register the addresses into the network stack
  register_addrs(ethernet_mac_addr(), get_ip_addr());
  pkt_ctrl_program_inspector(get_ip_addr(), USRP2_UDP_DATA_PORT);

  //2) register callbacks for udp ports we service
  init_udp_listeners();
  register_udp_listener(USRP2_UDP_CTRL_PORT, handle_udp_ctrl_packet);
  register_udp_listener(USRP2_UDP_DATA_PORT, handle_udp_data_packet);
  register_udp_listener(USRP2_UDP_ERR0_PORT, handle_udp_err0_packet);
#ifdef USRP2P
  register_udp_listener(USRP2_UDP_UPDATE_PORT, handle_udp_fw_update_packet);
#endif

  //3) set the routing mode to slave to set defaults
  pkt_ctrl_set_routing_mode(PKT_CTRL_ROUTING_MODE_SLAVE);

  //4) setup ethernet hardware to bring the link up
  ethernet_register_link_changed_callback(link_changed_callback);
  ethernet_init();

  while(true){

    size_t num_lines;
    void *buff = pkt_ctrl_claim_incoming_buffer(&num_lines);
    if (buff != NULL){
        handle_inp_packet((uint32_t *)buff, num_lines);
        pkt_ctrl_release_incoming_buffer();
    }

    pic_interrupt_handler();
    int pending = pic_regs->pending;		// poll for under or overrun

    if (pending & PIC_UNDERRUN_INT){
      pic_regs->pending = PIC_UNDERRUN_INT;	// clear interrupt
      putchar('U');
    }

    if (pending & PIC_OVERRUN_INT){
      pic_regs->pending = PIC_OVERRUN_INT;	// clear interrupt
      putchar('O');
    }
  }
}