Subversion Repositories openrisc

//==========================================================================

//

//      dev/if_fec.c

//

//      Fast ethernet device driver for PowerPC MPC8260 boards

//

//==========================================================================

// ####ECOSGPLCOPYRIGHTBEGIN####                                            

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

// This file is part of eCos, the Embedded Configurable Operating System.   

// Copyright (C) 1998, 1999, 2000, 2001, 2002 Free Software Foundation, Inc.

//

// eCos 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 2 or (at your option) any later      

// version.                                                                 

//

// eCos 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 eCos; if not, write to the Free Software Foundation, Inc.,    

// 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.            

//

// As a special exception, if other files instantiate templates or use      

// macros or inline functions from this file, or you compile this file      

// and link it with other works to produce a work based on this file,       

// this file does not by itself cause the resulting work to be covered by   

// the GNU General Public License. However the source code for this file    

// must still be made available in accordance with section (3) of the GNU   

// General Public License v2.                                               

//

// This exception does not invalidate any other reasons why a work based    

// on this file might be covered by the GNU General Public License.         

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

// ####ECOSGPLCOPYRIGHTEND####                                              

//==========================================================================

//#####DESCRIPTIONBEGIN####

//

// Author(s):    mtek

// Contributors: pfine

// Date:         2002-02-20

// Purpose:      

// Description:  hardware driver for MPC8260 FEC

//              

//

//####DESCRIPTIONEND####

//

//==========================================================================

#include <pkgconf/devs_eth_powerpc_quicc2.h>

#include <cyg/infra/cyg_type.h>

#include <cyg/infra/diag.h>

#include <cyg/hal/hal_arch.h>

#include <cyg/hal/hal_cache.h>

#include <cyg/hal/hal_intr.h>

#include <cyg/hal/var_intr.h>

#include <cyg/hal/drv_api.h>

#include <cyg/hal/hal_if.h>

#include <cyg/hal/mpc8260.h>

#include <cyg/io/eth/netdev.h>

#include <cyg/io/eth/eth_drv.h>

#ifdef CYGPKG_NET

#include <pkgconf/net.h>

#endif

#include "fec.h"

#include "EnetPHY.h"

#define ALIGN_TO_CACHE_LINES(x)  ( (long)((x) + 31) & 0xffffffe0 )

static unsigned char fec_eth_rxbufs[CYGNUM_DEVS_ETH_POWERPC_QUICC2_RxNUM *

                                    (CYGNUM_DEVS_ETH_POWERPC_QUICC2_BUFSIZE + 32)];

static unsigned char fec_eth_txbufs[CYGNUM_DEVS_ETH_POWERPC_QUICC2_TxNUM *

                                    (CYGNUM_DEVS_ETH_POWERPC_QUICC2_BUFSIZE + 32)];

// Buffer descriptors are in dual ported RAM, which is marked non-cached

#define FEC_BDs_NONCACHED

static struct fec_bd *const fec_eth_rxring = (struct fec_bd *)

  (QUICC2_VADS_IMM_BASE + FEC_PRAM_RxBD_Base);

static struct fec_bd *const fec_eth_txring = (struct fec_bd *)

  (QUICC2_VADS_IMM_BASE + FEC_PRAM_TxBD_Base);

static struct fec_eth_info fec_eth0_info;

static unsigned short _default_enaddr[] = {0x1234, 0x5678, 0x90a1};

static unsigned char enaddr[6];

#ifdef CYGPKG_REDBOOT

#include <pkgconf/redboot.h>

#ifdef CYGSEM_REDBOOT_FLASH_CONFIG

#include <redboot.h>

#include <flash_config.h>

RedBoot_config_option("Network hardware address [MAC]",

                      fec_esa,

                      ALWAYS_ENABLED, true,

                      CONFIG_ESA, 0

    );

RedBoot_config_option("Attempt to find 100 Mbps Ethernet",

                      fec_100,

                      ALWAYS_ENABLED, true,

                      CONFIG_BOOL, 0

    );

#endif

#endif

#define os_printf diag_printf

// CONFIG_ESA and CONFIG_BOOL are defined in redboot/include/flash_config.h

#ifndef CONFIG_ESA

#define CONFIG_ESA 6      // ethernet address length ...

#endif

#ifndef CONFIG_BOOL

#define CONFIG_BOOL 1

#endif

ETH_DRV_SC(fec_eth0_sc,

           &fec_eth0_info,     // Driver specific data

           "eth0",             // Name for this interface

           fec_eth_start,

           fec_eth_stop,

           fec_eth_control,

           fec_eth_can_send,

           fec_eth_send,

           fec_eth_recv,

           fec_eth_deliver,

           fec_eth_int,

           fec_eth_int_vector);

NETDEVTAB_ENTRY(fec_netdev,

                "fec_eth",

                fec_eth_init,

                &fec_eth0_sc);

#ifdef CYGPKG_NET

static cyg_interrupt fec_eth_interrupt;

static cyg_handle_t  fec_eth_interrupt_handle;

#endif

static void          fec_eth_int(struct eth_drv_sc *data);

#define FEC_ETH_INT CYGNUM_HAL_INTERRUPT_FCC2

// This ISR is called when the ethernet interrupt occurs

#ifdef CYGPKG_NET

static int

fec_eth_isr(cyg_vector_t vector, cyg_addrword_t data, HAL_SavedRegisters *regs)

{

  cyg_drv_interrupt_mask(FEC_ETH_INT);

  return (CYG_ISR_HANDLED|CYG_ISR_CALL_DSR);  // Run the DSR

}

#endif

// Deliver function (ex-DSR) handles the ethernet [logical] processing

static void

fec_eth_deliver(struct eth_drv_sc * sc)

{

  fec_eth_int(sc);

#ifdef CYGPKG_NET

  //  Clearing the event register acknowledges FCC2 interrupt ...

  //  cyg_drv_interrupt_acknowledge(FEC_ETH_INT);

  cyg_drv_interrupt_unmask(FEC_ETH_INT);

#endif

}

// Initialize the interface - performed at system startup

// This function must set up the interface, including arranging to

// handle interrupts, etc, so that it may be "started" cheaply later.

static bool

fec_eth_init(struct cyg_netdevtab_entry *tab)

{

    struct eth_drv_sc *sc = (struct eth_drv_sc *)tab->device_instance;

    struct fec_eth_info *qi = (struct fec_eth_info *)sc->driver_private;

    volatile t_PQ2IMM    *IMM = (volatile t_PQ2IMM *) QUICC2_VADS_IMM_BASE;

    volatile t_Fcc_Pram  *fcc =  (volatile t_Fcc_Pram *) (QUICC2_VADS_IMM_BASE + FEC_PRAM_OFFSET);

    volatile t_EnetFcc_Pram *E_fcc = &(fcc->SpecificProtocol.e);

#if defined(CYGPKG_HAL_POWERPC_VADS) || defined(CYGPKG_HAL_POWERPC_TS6)

    volatile t_BCSR *CSR   = (t_BCSR *) 0x04500000;

#endif

    int i;

    bool esa_ok;

    bool fec_100;

    unsigned char *c_ptr;

    UINT16 link_speed;

    // Link the memory to the driver control memory

    qi->fcc_reg = & (IMM->fcc_regs[FCC2]);

    // just in case :  disable Transmit and Receive 

    qi->fcc_reg->fcc_gfmr &= ~(FEC_GFMR_EN_Rx | FEC_GFMR_EN_Tx);

    // Via BCSR, (re)start LXT970

#if defined(CYGPKG_HAL_POWERPC_VADS) || defined(CYGPKG_HAL_POWERPC_TS6)

    EnableResetPHY(CSR);

#endif

    // Try to read the ethernet address of the transciever ...

#ifdef CYGPKG_REDBOOT

    esa_ok = flash_get_config("fec_100", &fec_100, CONFIG_BOOL);

#else

    esa_ok = CYGACC_CALL_IF_FLASH_CFG_OP(CYGNUM_CALL_IF_FLASH_CFG_GET,

                                         "fec_100", &fec_100, CONFIG_BOOL);

#endif

    link_speed = NOTLINKED;

    if(esa_ok && fec_100){

        // Via MII Management pins, tell LXT970 to initialize 

        os_printf("Attempting to acquire 100 Mbps half_duplex link ...");

        InitEthernetPHY((VUINT32 *) &(IMM->io_regs[PORT_C].pdir),

                        (VUINT32 *) &(IMM->io_regs[PORT_C].pdat),

                        HUNDRED_HD);

        link_speed = LinkTestPHY();

        os_printf("\n");

        if(link_speed == NOTLINKED){

            os_printf("Failed to get 100 Mbps half_duplex link.\n");

        }

    }

    if(link_speed == NOTLINKED){

        os_printf("Attempting to acquire 10 Mbps half_duplex link ...");

        InitEthernetPHY((VUINT32 *) &(IMM->io_regs[PORT_C].pdir),

                        (VUINT32 *) &(IMM->io_regs[PORT_C].pdat),

                        TEN_HD);

        link_speed = LinkTestPHY();

        os_printf("\n");

        if(link_speed == NOTLINKED){

            link_speed = LinkTestPHY();

            os_printf("Failed to get 10 Mbps half_duplex link.\n");

        }

    }

    switch ( link_speed ) {

    case HUNDRED_FD:

      os_printf("100 MB full-duplex ethernet link \n");

      break;

    case HUNDRED_HD:

      os_printf("100 MB half-duplex ethernet link \n");

      break;

    case TEN_FD:

      os_printf("10 MB full-duplex ethernet link \n");

      break;

    case TEN_HD:

      os_printf("10 MB half-duplex ethernet link \n");

      break;

    default:

      os_printf("NO ethernet link \n");

    }

    // Connect PORTC pins: (C19) to clk13, (C18) to clk 14

    IMM->io_regs[PORT_C].ppar |= 0x00003000;

    IMM->io_regs[PORT_C].podr &= ~(0x00003000);

    IMM->io_regs[PORT_C].psor &= ~(0x00003000);

    IMM->io_regs[PORT_C].pdir &= ~(0x00003000);

    // Connect clk13 to RxClk and clk14 to TxClk on FCC2

    IMM->cpm_mux_cmxfcr &= 0x7f007f00; // clear fcc2 clocks

    IMM->cpm_mux_cmxfcr |= 0x00250000; // set fcc2 clocks  (see 15-14)

    IMM->cpm_mux_cmxuar  = 0x0000;     // Utopia address reg, just clear

    // Initialize parallel port registers to connect FCC2 to MII

    IMM->io_regs[PORT_B].podr &= 0xffffc000; // clear bits 18-31 

    IMM->io_regs[PORT_B].psor &= 0xffffc000;

    IMM->io_regs[PORT_B].pdir &= 0xffffc000;

    IMM->io_regs[PORT_B].psor |= 0x00000004;

    IMM->io_regs[PORT_B].pdir |= 0x000003c5;

    IMM->io_regs[PORT_B].ppar |= 0x00003fff;

    // Initialize Receive Buffer Descriptors

    qi->rbase = fec_eth_rxring;

    qi->rxbd  = fec_eth_rxring;

    qi->rnext = fec_eth_rxring;

    c_ptr = fec_eth_rxbufs;

    for(i=0; i<CYGNUM_DEVS_ETH_POWERPC_QUICC2_RxNUM; i++) {

      fec_eth_rxring[i].ctrl   = (FEC_BD_Rx_Empty | FEC_BD_Rx_Int);

      fec_eth_rxring[i].length = 0;                   // reset 

      c_ptr = (unsigned char *) ALIGN_TO_CACHE_LINES(c_ptr);

      fec_eth_rxring[i].buffer = (volatile unsigned char *)c_ptr;

      c_ptr += CYGNUM_DEVS_ETH_POWERPC_QUICC2_BUFSIZE;

    }

    fec_eth_rxring[CYGNUM_DEVS_ETH_POWERPC_QUICC2_RxNUM-1].ctrl |= FEC_BD_Rx_Wrap;

    // Initialize Transmit Buffer Descriptors

    qi->tbase = fec_eth_txring;

    qi->txbd  = fec_eth_txring;

    qi->tnext = fec_eth_txring;

    c_ptr = fec_eth_txbufs;

    for(i=0; i<CYGNUM_DEVS_ETH_POWERPC_QUICC2_TxNUM; i++) {

      fec_eth_txring[i].ctrl   = (FEC_BD_Tx_Pad | FEC_BD_Tx_Int);

      fec_eth_txring[i].length = 0;   // reset : Write before send

      c_ptr = (unsigned char *) ALIGN_TO_CACHE_LINES(c_ptr);

      fec_eth_txring[i].buffer = (volatile unsigned char  *)c_ptr;

      c_ptr += CYGNUM_DEVS_ETH_POWERPC_QUICC2_BUFSIZE;

    }

    fec_eth_txring[CYGNUM_DEVS_ETH_POWERPC_QUICC2_TxNUM-1].ctrl |= FEC_BD_Tx_Wrap;

    // Common FCC Parameter RAM initialization

    fcc->riptr = FEC_PRAM_RIPTR;   // in dual port RAM (see 28-11)

    fcc->tiptr = FEC_PRAM_TIPTR;   // in dual port RAM (see 28-11)

    fcc->mrblr = FEC_PRAM_MRBLR;   // ?? FROM 8101 code ...

    fcc->rstate &= FEC_FCR_INIT;

    fcc->rstate |= FEC_FCR_MOT_BO;

    fcc->rbase = (long) fec_eth_rxring;

    fcc->tstate &= FEC_FCR_INIT;

    fcc->tstate |= FEC_FCR_MOT_BO;

    fcc->tbase = (long) fec_eth_txring;

    // Ethernet Specific FCC Parameter RAM Initialization     

    E_fcc->c_mask   = FEC_PRAM_C_MASK; // (see 30-9)

    E_fcc->c_pres   = FEC_PRAM_C_PRES;

    E_fcc->crcec    = 0;

    E_fcc->alec     = 0;

    E_fcc->disfc    = 0;

    E_fcc->ret_lim  = FEC_PRAM_RETLIM;

    E_fcc->p_per    = FEC_PRAM_PER_LO;

    E_fcc->gaddr_h  = 0;

    E_fcc->gaddr_l  = 0;

    E_fcc->tfcstat  = 0;

    E_fcc->mflr     = FEC_MAX_FLR;

    // Try to read the ethernet address of the transciever ...

#ifdef CYGPKG_REDBOOT

    esa_ok = flash_get_config("fec_esa", enaddr, CONFIG_ESA);

#else

    esa_ok = CYGACC_CALL_IF_FLASH_CFG_OP(CYGNUM_CALL_IF_FLASH_CFG_GET,

                                         "fec_esa", enaddr, CONFIG_ESA);

#endif

    if (!esa_ok) {

      // If can't use the default ...

      os_printf("FEC_ETH - Warning! ESA unknown\n");

      memcpy(enaddr, _default_enaddr, sizeof(enaddr));

    }

    E_fcc->paddr1_h = ((short)enaddr[5] << 8) | enaddr[4]; // enaddr[2]; 

    E_fcc->paddr1_m = ((short)enaddr[3] << 8) | enaddr[2]; // enaddr[1];

    E_fcc->paddr1_l = ((short)enaddr[1] << 8) | enaddr[0]; // enaddr[0];

    E_fcc->iaddr_h  = 0;

    E_fcc->iaddr_l  = 0;

    E_fcc->minflr   = FEC_MIN_FLR;

    E_fcc->taddr_h  = 0;

    E_fcc->taddr_m  = 0;

    E_fcc->taddr_l  = 0;

    E_fcc->pad_ptr  = FEC_PRAM_TIPTR; // No special padding char ...

    E_fcc->cf_type  = 0;

    E_fcc->maxd1    = FEC_PRAM_MAXD;

    E_fcc->maxd2    = FEC_PRAM_MAXD;

    // FCC register initialization 

    IMM->fcc_regs[FCC2].fcc_gfmr = FEC_GFMR_INIT;

    IMM->fcc_regs[FCC2].fcc_psmr = FEC_PSMR_INIT;

    IMM->fcc_regs[FCC2].fcc_dsr  = FEC_DSR_INIT;

#ifdef CYGPKG_NET

    // clear the events of FCC2

    IMM->fcc_regs[FCC2].fcc_fcce = 0xFFFF0000;

    IMM->fcc_regs[FCC2].fcc_fccm = FEC_EV_TXE | FEC_EV_TXB | FEC_EV_RXF;

    // Set up to handle interrupts

    cyg_drv_interrupt_create(FEC_ETH_INT,

                             0,  // Highest //CYGARC_SIU_PRIORITY_HIGH,

                             (cyg_addrword_t)sc, //  Data passed to ISR

                             (cyg_ISR_t *)fec_eth_isr,

                             (cyg_DSR_t *)eth_drv_dsr,

                             &fec_eth_interrupt_handle,

                             &fec_eth_interrupt);

    cyg_drv_interrupt_attach(fec_eth_interrupt_handle);

    cyg_drv_interrupt_acknowledge(FEC_ETH_INT);

    cyg_drv_interrupt_unmask(FEC_ETH_INT);

#else

    // Mask the interrupts 

    IMM->fcc_regs[FCC2].fcc_fccm = 0;

#endif

    // Issue Init RX & TX Parameters Command for FCC2

    while ((IMM->cpm_cpcr & CPCR_FLG) != CPCR_READY_TO_RX_CMD);

    IMM->cpm_cpcr = CPCR_INIT_TX_RX_PARAMS |

      CPCR_FCC2_CH |

      CPCR_MCN_FEC |

      CPCR_FLG;              /* ISSUE COMMAND */

    while ((IMM->cpm_cpcr & CPCR_FLG) != CPCR_READY_TO_RX_CMD);

    // Initialize upper level driver for ecos

    (sc->funs->eth_drv->init)(sc, (unsigned char *)&enaddr);

    return true;

}

//

// This function is called to "start up" the interface.  It may be called

// multiple times, even when the hardware is already running.  It will be

// called whenever something "hardware oriented" changes and should leave

// the hardware ready to send/receive packets.

//

static void

fec_eth_start(struct eth_drv_sc *sc, unsigned char *enaddr, int flags)

{

  struct fec_eth_info *qi = (struct fec_eth_info *)sc->driver_private;

  // Enable the device : 

  // Set the ENT/ENR bits in the GFMR -- Enable Transmit/Receive

  qi->fcc_reg->fcc_gfmr |= (FEC_GFMR_EN_Rx | FEC_GFMR_EN_Tx);

}

//

// This function is called to shut down the interface.

//

static void

fec_eth_stop(struct eth_drv_sc *sc)

{

  struct fec_eth_info *qi = (struct fec_eth_info *)sc->driver_private;

  // Disable the device : 

  // Clear the ENT/ENR bits in the GFMR -- Disable Transmit/Receive

  qi->fcc_reg->fcc_gfmr &= ~(FEC_GFMR_EN_Rx | FEC_GFMR_EN_Tx);

}

//

// This function is called for low level "control" operations

//

static int

fec_eth_control(struct eth_drv_sc *sc, unsigned long key,

                void *data, int length)

{

  switch (key) {

  case ETH_DRV_SET_MAC_ADDRESS:

    return 0;

    break;

  default:

    return 1;

    break;

  }

}

//

// This function is called to see if another packet can be sent.

// It should return the number of packets which can be handled.

// Zero should be returned if the interface is busy and can not send any more.

//

static int

fec_eth_can_send(struct eth_drv_sc *sc)

{

  struct fec_eth_info *qi = (struct fec_eth_info *)sc->driver_private;

  volatile struct fec_bd *txbd = qi->txbd;

  int cache_state;

  HAL_DCACHE_IS_ENABLED(cache_state);

#ifndef FEC_BDs_NONCACHED

  if (cache_state) {

    HAL_DCACHE_INVALIDATE(fec_eth_txring,

                          8*CYGNUM_DEVS_ETH_POWERPC_QUICC2_TxNUM);

  }

#endif

  return ((txbd->ctrl & (FCC_BD_Tx_TC | FCC_BD_Tx_Ready)) == 0);

}

//

// This routine is called to send data to the hardware.

static void

fec_eth_send(struct eth_drv_sc *sc, struct eth_drv_sg *sg_list, int sg_len,

             int total_len, unsigned long key)

{

  struct fec_eth_info *qi = (struct fec_eth_info *)sc->driver_private;

  struct fec_bd *txbd, *txfirst;

  volatile char *bp;

  int i, txindex, cache_state;

  HAL_DCACHE_IS_ENABLED(cache_state);

#ifndef FEC_BDs_NONCACHED

  if (cache_state) {

    HAL_DCACHE_INVALIDATE(fec_eth_txring,

                          8*CYGNUM_DEVS_ETH_POWERPC_QUICC2_TxNUM);

  }

#endif

  // Find a free buffer

  txbd = txfirst = qi->txbd;

  while (txbd->ctrl & FEC_BD_Tx_Ready) {

    // This buffer is busy, move to next one

    if (txbd->ctrl & FEC_BD_Tx_Wrap) {

      txbd = qi->tbase;

    } else {

      txbd++;

    }

    if (txbd == txfirst) {

#ifdef CYGPKG_NET

      panic ("No free xmit buffers");

#else

      os_printf("FEC Ethernet: No free xmit buffers\n");

#endif

    }

  }

  // Remember the next buffer to try

  if (txbd->ctrl & FEC_BD_Tx_Wrap) {

    qi->txbd = qi->tbase;

  } else {

    qi->txbd = txbd+1;

  }

  txindex = ((unsigned long)txbd - (unsigned long)qi->tbase) / sizeof(*txbd);

  qi->txkey[txindex] = key;

  // Set up buffer

  txbd->length = total_len;

  bp = txbd->buffer;

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

    memcpy((void *)bp, (void *)sg_list[i].buf, sg_list[i].len);

    bp += sg_list[i].len;

  }

  // Make sure no stale data buffer ...

  if (cache_state) {

    HAL_DCACHE_FLUSH(txbd->buffer, txbd->length);

  }

  // Send it on it's way

  txbd->ctrl |= FEC_BD_Tx_Ready | FEC_BD_Tx_Last | FEC_BD_Tx_TC;

#ifndef FEC_BDs_NONCACHED

  if (cache_state) {

    HAL_DCACHE_FLUSH(fec_eth_txring,

                     8*CYGNUM_DEVS_ETH_POWERPC_QUICC2_TxNUM);

  }

#endif  

}

//

// This function is called when a packet has been received.  It's job is

// to prepare to unload the packet from the hardware.  Once the length of

// the packet is known, the upper layer of the driver can be told.  When

// the upper layer is ready to unload the packet, the internal function

// 'fec_eth_recv' will be called to actually fetch it from the hardware.

//

static void

fec_eth_RxEvent(struct eth_drv_sc *sc)

{

  struct fec_eth_info *qi = (struct fec_eth_info *)sc->driver_private;

  struct fec_bd *rxbd;

  int cache_state;

  HAL_DCACHE_IS_ENABLED(cache_state);

#ifndef FEC_BDs_NONCACHED

  if (cache_state) {

    HAL_DCACHE_INVALIDATE(fec_eth_rxring,

                          8*CYGNUM_DEVS_ETH_POWERPC_QUICC2_RxNUM);

  }

#endif

  rxbd = qi->rnext;

  while ((rxbd->ctrl & FEC_BD_Rx_Empty) == 0) {

    qi->rxbd = rxbd;  // Save for callback

    // This is the right way of doing it, but dcbi has a bug ...

    //    if (cache_state) {

    //      HAL_DCACHE_INVALIDATE(rxbd->buffer, rxbd->length); 

    //    }

    (sc->funs->eth_drv->recv)(sc, rxbd->length);

    if (cache_state) {

      HAL_DCACHE_FLUSH(rxbd->buffer, rxbd->length);

    }

    rxbd->ctrl |= FEC_BD_Rx_Empty;

    if (rxbd->ctrl & FEC_BD_Rx_Wrap) {

      rxbd = qi->rbase;

    } else {

      rxbd++;

    }

  }

  // Remember where we left off

  qi->rnext = (struct fec_bd *)rxbd;

  // Make sure no stale data

#ifndef FEC_BDs_NONCACHED

  if (cache_state) {

    HAL_DCACHE_FLUSH(fec_eth_rxring,

                     8*CYGNUM_DEVS_ETH_POWERPC_QUICC2_RxNUM);

  }

#endif

}

//

// This function is called as a result of the "eth_drv_recv()" call above.

// It's job is to actually fetch data for a packet from the hardware once

// memory buffers have been allocated for the packet.  Note that the buffers

// may come in pieces, using a scatter-gather list.  This allows for more

// efficient processing in the upper layers of the stack.

//

static void

fec_eth_recv(struct eth_drv_sc *sc, struct eth_drv_sg *sg_list, int sg_len)

{

  struct fec_eth_info *qi = (struct fec_eth_info *)sc->driver_private;

  unsigned char *bp;

  int i;

  bp = (unsigned char *)qi->rxbd->buffer;

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

    if (sg_list[i].buf != 0) {

      memcpy((void *)sg_list[i].buf, bp, sg_list[i].len);

      bp += sg_list[i].len;

    }

  }

}

static void

fec_eth_TxEvent(struct eth_drv_sc *sc, int stat)

{

  struct fec_eth_info *qi = (struct fec_eth_info *)sc->driver_private;

  struct fec_bd *txbd;

  int txindex, cache_state;

  // Make sure no stale data

  HAL_DCACHE_IS_ENABLED(cache_state);

#ifndef FEC_BDs_NONCACHED

  if (cache_state) {

    HAL_DCACHE_INVALIDATE(fec_eth_txring,

                          8*CYGNUM_DEVS_ETH_POWERPC_QUICC2_TxNUM);

  }

#endif

  txbd = qi->tnext;

  // Note: TC field is used to indicate the buffer has/had data in it

  while ( (txbd->ctrl & (FEC_BD_Tx_TC | FEC_BD_Tx_Ready)) == FEC_BD_Tx_TC ) {

    txindex = ((unsigned long)txbd - (unsigned long)qi->tbase) / sizeof(*txbd);

    (sc->funs->eth_drv->tx_done)(sc, qi->txkey[txindex], 0);

    txbd->ctrl &= ~FEC_BD_Tx_TC;

    if (txbd->ctrl & FEC_BD_Tx_Wrap) {

      txbd = qi->tbase;

    } else {

      txbd++;

    }

  }

  // Remember where we left off

  qi->tnext = (struct fec_bd *)txbd;

  // Make sure no stale data  

#ifndef FEC_BDs_NONCACHED

  if (cache_state) {

    HAL_DCACHE_FLUSH(fec_eth_txring,

                     8*CYGNUM_DEVS_ETH_POWERPC_QUICC2_TxNUM);

  }

#endif

}

//

// Interrupt processing

//

static void

fec_eth_int(struct eth_drv_sc *sc)