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//////////////////////////////////////////////////////////////////////

////                                                              ////

////  Interrupt-driven Ethernet MAC test code                     ////

////                                                              ////

////  Description                                                 ////

////  Do ethernet receive path testing                            ////

////  Relies on testbench to provide simulus - expects at least   ////

////  256 packets to be sent.                                     ////

////                                                              ////

////  Author(s):                                                  ////

////      - Julius Baxter, julius@opencores.org                   ////

////                                                              ////

////                                                              ////

//////////////////////////////////////////////////////////////////////

////                                                              ////

//// Copyright (C) 2009 Authors and OPENCORES.ORG                 ////

////                                                              ////

//// This source file may be used and distributed without         ////

//// restriction provided that this copyright statement is not    ////

//// removed from the file and that any derivative work contains  ////

//// the original copyright notice and the associated disclaimer. ////

////                                                              ////

//// This source file is free software; you can redistribute it   ////

//// and/or modify it under the terms of the GNU Lesser General   ////

//// Public License as published by the Free Software Foundation; ////

//// either version 2.1 of the License, or (at your option) any   ////

//// later version.                                               ////

////                                                              ////

//// This source 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 Lesser General Public License for more ////

//// details.                                                     ////

////                                                              ////

//// You should have received a copy of the GNU Lesser General    ////

//// Public License along with this source; if not, download it   ////

//// from http://www.opencores.org/lgpl.shtml                     ////

////                                                              ////

//////////////////////////////////////////////////////////////////////

#include "cpu-utils.h"

#include "board.h"

#include "int.h"

#include "ethmac.h"

#include "eth-phy-mii.h"

volatile unsigned tx_done;

volatile unsigned rx_done;

/* Functions in this file */

void ethmac_setup(void);

void oeth_dump_bds();

/* Interrupt functions */

void oeth_interrupt(void);

static void oeth_rx(void);

static void oeth_tx(void);

/* Function to calculate checksum of ping responses we send */

unsigned short calculate_checksum(char* dats, unsigned int len) ;

/* Let the ethernet packets use a space beginning here for buffering */

#define ETH_BUFF_BASE 0x200000;

#define RXBUFF_PREALLOC 1

#define TXBUFF_PREALLOC 1

/* The transmitter timeout

 */

#define TX_TIMEOUT      (2*HZ)

/* Buffer number (must be 2^n)

 * Note: if changing these, must also change settings in eth_stim.v testbench

 * file!

 */

#define OETH_RXBD_NUM           16

#define OETH_TXBD_NUM           16

#define OETH_RXBD_NUM_MASK      (OETH_RXBD_NUM-1)

#define OETH_TXBD_NUM_MASK      (OETH_TXBD_NUM-1)

/* Buffer size

 */

#define OETH_RX_BUFF_SIZE       0x600

#define OETH_TX_BUFF_SIZE       0x600

/* Buffer size  (if not XXBUF_PREALLOC

 */

#define MAX_FRAME_SIZE          1518

/* The buffer descriptors track the ring buffers.

 */

struct oeth_private {

  //struct      sk_buff* rx_skbuff[OETH_RXBD_NUM];

  //struct      sk_buff* tx_skbuff[OETH_TXBD_NUM];

  unsigned short        tx_next;                        /* Next buffer to be sent */

  unsigned short        tx_last;                        /* Next buffer to be checked if packet sent */

  unsigned short        tx_full;                        /* Buffer ring fuul indicator */

  unsigned short        rx_cur;                         /* Next buffer to be checked if packet received */

  oeth_regs     *regs;                  /* Address of controller registers. */

  oeth_bd               *rx_bd_base;            /* Address of Rx BDs. */

  oeth_bd               *tx_bd_base;            /* Address of Tx BDs. */

  //    struct net_device_stats stats;

};

char CHECKSUM_BUFFER[OETH_RX_BUFF_SIZE]; // Big enough to hold a packet

#define PHYNUM 7

void ethmac_setup(void)

{

  // from arch/or32/drivers/open_eth.c

  volatile oeth_regs *regs;

  regs = (oeth_regs *)(OETH_REG_BASE);

  /* Reset MII mode module */

  regs->miimoder = OETH_MIIMODER_RST; /* MII Reset ON */

  regs->miimoder &= ~OETH_MIIMODER_RST; /* MII Reset OFF */

  regs->miimoder = 0x64; /* Clock divider for MII Management interface */

  /* Reset the controller.

   */

  regs->moder = OETH_MODER_RST; /* Reset ON */

  regs->moder &= ~OETH_MODER_RST;       /* Reset OFF */

  /* Setting TXBD base to OETH_TXBD_NUM.

   */

  regs->tx_bd_num = OETH_TXBD_NUM;

  /* Set min/max packet length

   */

  regs->packet_len = 0x00400600;

  /* Set IPGT register to recomended value

   */

  regs->ipgt = 0x12;

  /* Set IPGR1 register to recomended value

   */

  regs->ipgr1 = 0x0000000c;

  /* Set IPGR2 register to recomended value

   */

  regs->ipgr2 = 0x00000012;

  /* Set COLLCONF register to recomended value

   */

  regs->collconf = 0x000f003f;

  /* Set control module mode

   */

#if 0

  regs->ctrlmoder = OETH_CTRLMODER_TXFLOW | OETH_CTRLMODER_RXFLOW;

#else

  regs->ctrlmoder = 0;

#endif

  /* Clear MIIM registers */

  regs->miitx_data = 0;

  regs->miiaddress = 0;

  regs->miicommand = 0;

  regs->mac_addr1 = ETH_MACADDR0 << 8 | ETH_MACADDR1;

  regs->mac_addr0 = ETH_MACADDR2 << 24 | ETH_MACADDR3 << 16 | ETH_MACADDR4 << 8 | ETH_MACADDR5;

  /* Clear all pending interrupts

   */

  regs->int_src = 0xffffffff;

  /* Promisc, IFG, CRCEn

   */

  regs->moder |= OETH_MODER_PRO | OETH_MODER_PAD | OETH_MODER_IFG | OETH_MODER_CRCEN | OETH_MODER_FULLD;

  /* Enable interrupt sources.

   */

  regs->int_mask = OETH_INT_MASK_TXB    |

    OETH_INT_MASK_TXE   |

    OETH_INT_MASK_RXF   |

    OETH_INT_MASK_RXE   |

    OETH_INT_MASK_BUSY  |

    OETH_INT_MASK_TXC   |

    OETH_INT_MASK_RXC;

  // Buffer setup stuff

  volatile oeth_bd *tx_bd, *rx_bd;

  int i,j,k;

  /* Initialize TXBD pointer

   */

  tx_bd = (volatile oeth_bd *)OETH_BD_BASE;

  /* Initialize RXBD pointer

   */

  rx_bd = ((volatile oeth_bd *)OETH_BD_BASE) + OETH_TXBD_NUM;

  /* Preallocated ethernet buffer setup */

  unsigned long mem_addr = ETH_BUFF_BASE; /* Defined at top */

  // Setup TX Buffers

  for(i = 0; i < OETH_TXBD_NUM; i++) {

      //tx_bd[i].len_status = OETH_TX_BD_PAD | OETH_TX_BD_CRC | OETH_RX_BD_IRQ;

      tx_bd[i].len_status = OETH_TX_BD_PAD | OETH_TX_BD_CRC;

      tx_bd[i].addr = mem_addr;

      mem_addr += OETH_TX_BUFF_SIZE;

  }

  tx_bd[OETH_TXBD_NUM - 1].len_status |= OETH_TX_BD_WRAP;

  // Setup RX buffers

  for(i = 0; i < OETH_RXBD_NUM; i++) {

    rx_bd[i].len_status = OETH_RX_BD_EMPTY | OETH_RX_BD_IRQ; // Init. with IRQ

    rx_bd[i].addr = mem_addr;

    mem_addr += OETH_RX_BUFF_SIZE;

  }

  rx_bd[OETH_RXBD_NUM - 1].len_status |= OETH_RX_BD_WRAP; // Last buffer wraps

  /* Enable just the receiver

   */

  regs->moder &= ~(OETH_MODER_RXEN | OETH_MODER_TXEN);

  regs->moder |= OETH_MODER_RXEN /* | OETH_MODER_TXEN*/;

  return;

}

void

ethmac_halt(void)

{

  volatile oeth_regs *regs;

  regs = (oeth_regs *)(OETH_REG_BASE);

  // Disable receive and transmit

  regs->moder &= ~(OETH_MODER_RXEN | OETH_MODER_TXEN);

}

/* The interrupt handler.

 */

void

oeth_interrupt(void)

{

  volatile oeth_regs *regs;

  regs = (oeth_regs *)(OETH_REG_BASE);

  uint  int_events;

  int serviced;

        serviced = 0;

        /* Get the interrupt events that caused us to be here.

         */

        int_events = regs->int_src;

        regs->int_src = int_events;

        /* Handle receive event in its own function.

         */

        if (int_events & (OETH_INT_RXF | OETH_INT_RXE)) {

                serviced |= 0x1;

                oeth_rx();

        }

        /* Handle transmit event in its own function.

         */

        if (int_events & (OETH_INT_TXB | OETH_INT_TXE)) {

                serviced |= 0x2;

                oeth_tx();

                serviced |= 0x2;

        }

        /* Check for receive busy, i.e. packets coming but no place to

         * put them.

         */

        if (int_events & OETH_INT_BUSY) {

                serviced |= 0x4;

                if (!(int_events & (OETH_INT_RXF | OETH_INT_RXE)))

                  oeth_rx();

        }

        return;

}

static void

oeth_rx(void)

{

  volatile oeth_regs *regs;

  regs = (oeth_regs *)(OETH_REG_BASE);

  volatile oeth_bd *rx_bdp;

  int   pkt_len, i;

  int   bad = 0;

  rx_bdp = ((oeth_bd *)OETH_BD_BASE) + OETH_TXBD_NUM;

  /* Find RX buffers marked as having received data */

  for(i = 0; i < OETH_RXBD_NUM; i++)

    {

      bad=0;

      /* Looking for buffer descriptors marked not empty */

      if(!(rx_bdp[i].len_status & OETH_RX_BD_EMPTY)){

        /* Check status for errors.

         */

        report(i);

        report(rx_bdp[i].len_status);

        if (rx_bdp[i].len_status & (OETH_RX_BD_TOOLONG | OETH_RX_BD_SHORT)) {

          bad = 1;

          report(0xbaad0001);

        }

        if (rx_bdp[i].len_status & OETH_RX_BD_DRIBBLE) {

          bad = 1;

          report(0xbaad0002);

        }

        if (rx_bdp[i].len_status & OETH_RX_BD_CRCERR) {

          bad = 1;

          report(0xbaad0003);

        }

        if (rx_bdp[i].len_status & OETH_RX_BD_OVERRUN) {

          bad = 1;

          report(0xbaad0004);

        }

        if (rx_bdp[i].len_status & OETH_RX_BD_MISS) {

          report(0xbaad0005);

        }

        if (rx_bdp[i].len_status & OETH_RX_BD_LATECOL) {

          bad = 1;

          report(0xbaad0006);

        }

        if (bad) {

          rx_bdp[i].len_status &= ~OETH_RX_BD_STATS;

          rx_bdp[i].len_status |= OETH_RX_BD_EMPTY;

          //exit(0xbaaaaaad);

          continue;

        }

        else {

          /*

           * Process the incoming frame.

           */

          pkt_len = rx_bdp[i].len_status >> 16;

          // Do a bit of work - ie. copy it, process it

          memcpy(CHECKSUM_BUFFER, rx_bdp[i].addr, pkt_len);

          report(0xc4eccccc);

          report(calculate_checksum(CHECKSUM_BUFFER, pkt_len));

          /* finish up */

          rx_bdp[i].len_status &= ~OETH_RX_BD_STATS; /* Clear stats */

          rx_bdp[i].len_status |= OETH_RX_BD_EMPTY; /* Mark RX BD as empty */

          rx_done++;

          report(rx_done);

        }

      }

    }

}

// Calculate checksum on received data.

// From http://lkml.indiana.edu/hypermail/linux/kernel/9612.3/0060.html

unsigned short calculate_checksum(char* dats, unsigned int len)

{

  unsigned int itr;

  unsigned long accum = 0;

  unsigned long longsum;

  // Sum all pairs of data

  for(itr=0;itr<(len & ~0x1);itr+=2)

    accum += (unsigned long)(((dats[itr]<<8)&0xff00)|(dats[itr+1]&0x00ff));

  if (len & 0x1) // Do leftover

    accum += (unsigned long) ((dats[itr-1]<<8)&0xff00);

  longsum = (unsigned long) (accum & 0xffff);

  longsum += (unsigned long) (accum >> 16); // Sum the carries

  longsum += (longsum >> 16);

  return (unsigned short)((longsum ^ 0xffff) & 0xffff);

}

static void

oeth_tx(void)

{

  volatile oeth_bd *tx_bd;

  int i;

  tx_bd = (volatile oeth_bd *)OETH_BD_BASE; /* Search from beginning*/

  /* Go through the TX buffs, search for one that was just sent */

  for(i = 0; i < OETH_TXBD_NUM; i++)

    {

      /* Looking for buffer NOT ready for transmit. and IRQ enabled */

      if( (!(tx_bd[i].len_status & (OETH_TX_BD_READY))) && (tx_bd[i].len_status & (OETH_TX_BD_IRQ)) )

        {

          /* Single threaded so no chance we have detected a buffer that has had its IRQ bit set but not its BD_READ flag. Maybe this won't work in linux */

          tx_bd[i].len_status &= ~OETH_TX_BD_IRQ;

          /* Probably good to check for TX errors here */

          /* set our test variable */

          tx_done = 1;

        }

    }

  return;

}

// Loop to check if a number is prime by doing mod divide of the number

// to test by every number less than it

int

is_prime_number(unsigned long n)

{

  unsigned long c;

  if (n < 2) return 0;

  for(c=2;c<n;c++)

    if ((n % c) == 0)

      return 0;

  return 1;

}

int

main ()

{

  /* Initialise handler vector */

  int_init();

  /* Install ethernet interrupt handler, it is enabled here too */

  int_add(ETH0_IRQ, oeth_interrupt, 0);

  /* Enable interrupts in supervisor register */

  cpu_enable_user_interrupts();

  /* Enable CPU timer */

  cpu_enable_timer();

  rx_done = 0;

  ethmac_setup(); /* Configure MAC, TX/RX BDs and enable RX in MODER */

#define NUM_PRIMES_TO_CHECK 1000

#define RX_TEST_LENGTH_PACKETS 12

  char prime_check_results[NUM_PRIMES_TO_CHECK];

  unsigned long num_to_check;

  for(num_to_check=2;num_to_check<NUM_PRIMES_TO_CHECK;num_to_check++)

    {

      prime_check_results[num_to_check-2]

        = (char) is_prime_number(num_to_check);

      report(num_to_check | (0x1e<<24));

      report(prime_check_results[num_to_check-2] | (0x2e<<24));

      // Check number of packets received, testbench will hopefully send at

      // least this many packets

      if (rx_done >= (RX_TEST_LENGTH_PACKETS - 1))

        exit(0x8000000d);

    }

  ethmac_halt();

  exit(0x8000000d);

  return 0;

}