dev_net_rtl8019.c

这是Skyeye 0.9 版本的源代码

//zzc: 2005-2-6 currently not support network simulation on Cygwin
#ifndef __CYGWIN__
/*
	dev_net_rtl8019.c - skyeye realtek 8019 ethernet controllor simulation
	Copyright (C) 2003 - 2005 Skyeye Develop Group
        for help please send mail to <[e-mail]>
	
	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 2 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., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA 
 
*/
/*
 * 05/25/2005   modified for rtl8019
 *                      walimis <[e-mail]>
 * 04/27/2003	add net option support
 * 			chenyu <[e-mail]>
 * 02/25/2003 	initial version
 *			yangye <[e-mail]> 		
 */

#include <signal.h>
#include <sys/time.h>
#include <armdefs.h>
#include "skyeye_device.h"
#include "dev_net_rtl8019.h"



//if you don't want to the debug info,just commit below two line
//#define DEBUG 1
#undef DEBUG
#if DEBUG
#define DBG_PRINT(a...) fprintf(stderr, ##a)
#else
#define DBG_PRINT(a...)
#endif

static struct device_default_value rtl8019_net_def[] = {
  /* name         base         size   interrupt array */
  {"at91", 0xfffa0000, 0xff, {16, 0, 0, 0}},
  {NULL},
};

#define MAX_DEVICE_NUM 10
static struct device_desc *rtl8019_devs[MAX_DEVICE_NUM];


static inline void
net_rtl8019_set_update_intr (struct device_desc *dev)
{
  struct device_interrupt *intr = &dev->intr;
  struct machine_config *mc = (struct machine_config *) dev->mach;
  struct net_rtl8019_io *io = (struct net_rtl8019_io *) dev->data;
  mc->mach_set_intr (intr->interrupts[INT_RTL8019]);
  mc->mach_update_intr (mc);
}

static inline void
set_time (int packets)
{
  struct itimerval value;
  value.it_value.tv_sec = 0;
  value.it_value.tv_usec = packets;
  value.it_interval = value.it_value;
  setitimer (ITIMER_REAL, &value, NULL);
}

static void
send_interrupt ()
{
  int i;
  struct device_desc *dev;

  for (i = 0; i < MAX_DEVICE_NUM; i++)
    {
      if ((dev = rtl8019_devs[i]) != NULL)
	{
	  struct net_device *net_dev = (struct net_device *) dev->dev;
	  struct machine_config *mc = (struct machine_config *) dev->mach;
	  struct net_rtl8019_io *io = (struct net_rtl8019_io *) dev->data;
	  if ((io->need_update) && (io->IMR & io->ISR))
	    {
	      net_rtl8019_set_update_intr (dev);
	      io->need_update = 0;
	      set_time (0);
	      return;
	    }

	}
    }
}
static void
init_sigaction (void)
{
  struct sigaction act;
  act.sa_handler = send_interrupt;
  act.sa_flags = 0;
  sigemptyset (&act.sa_mask);
  sigaction (SIGALRM, &act, NULL);
}

static void
write_cr (struct device_desc *dev, u8 data)
{
  struct net_device *net_dev = (struct net_device *) dev->dev;
  struct net_rtl8019_io *io = (struct net_rtl8019_io *) dev->data;
  u8 startpage;
  u16 packet_len;
  u16 rtl8019_len;

  DBG_PRINT ("write_cr begin: data %d\n", data);

  // Validate remote-DMA (RD2,RD1,RD0 not allowed to be 000) 
  if (((data & 0x38) == 0x00))
    {				//wrong command
      DBG_PRINT ("write_cr: wrong command\n");
      return;
    }

  // XMIT command
  if (data & CMD_XMIT)
    {
      DBG_PRINT ("write_cr: xmit command\n");
      startpage = (io->TPSR - START_PAGE);	//tpsr - 0x40
      packet_len = (((u16) io->TBCR1 << 8) | (io->TBCR0));
      packet_len &= 0xffff;


      io->TSR = 0;
      if (!rtl8019_output
	  (dev, (io->sram + startpage * PAGE_SIZE), packet_len))
	{
	  io->TSR |= TSR_PTX;
	}
      else
	{
	  io->TSR |= TSR_COL;
	}

		/**** send a interrupt to CPU here! ****/
      io->ISR |= ISR_PTX;
      set_time (packet_len);
      io->need_update = 1;
      //net_rtl8019_set_update_intr(dev);

    }

  //remote dma write 
  if ((data & CMD_READ) && (data & CMD_RUN))
    {
      rtl8019_len = (((u16) io->RBCR1 << 8) | io->RBCR0);
      io->remote_read_offset =
	(u16) (io->RSAR1 << 8 | io->RSAR0) - (u16) (START_PAGE * PAGE_SIZE);
      io->remote_read_offset &= 0xffff;
      io->remote_read_count = rtl8019_len;
      //printf("io->remote_read_count:%d,io->remote_read_offset:%x\n", io->remote_read_count, io->remote_read_offset);
    }

  //remote dma write 
  if ((data & CMD_WRITE) && (data & CMD_RUN) && ((data & CMD_NODMA) == 0))
    {

      io->remote_write_offset =
	(io->RSAR1 << 8 | io->RSAR0) - START_PAGE * PAGE_SIZE;
      io->remote_write_count = (((u16) io->RBCR1 << 8) | io->RBCR0);
      io->remote_write_count &= 0xffff;
      //printf("rtl8019 rw:count:%d,offset:%x\n", io->remote_write_count, io->remote_write_offset);

    }

  io->CR = data;

  DBG_PRINT ("write_cr: end\n");
}

static void
remote_write_word (struct device_desc *dev, u16 data)
{
  struct net_device *net_dev = (struct net_device *) dev->dev;
  struct net_rtl8019_io *io = (struct net_rtl8019_io *) dev->data;

  DBG_PRINT ("remote_write begin: data %d\n", data);
  if (io->CR & CMD_WRITE)
    {				//in remote write mode
      io->sram[io->remote_write_offset] = data & 0xff;
      io->sram[io->remote_write_offset + 1] = data >> 8;
      io->remote_write_offset += 2;
      io->remote_write_count -= 2;


      if (io->remote_write_count <= 0)
	{
	  io->CR &= (~CMD_WRITE);	//clear dma command in CR
	  io->CR |= CMD_NODMA;

	  io->ISR |= ISR_RDC;	// remote write finished int
	  if ((ISR_RDC & io->IMR))
	    {
	      net_rtl8019_set_update_intr (dev);
	    }
	}
      DBG_PRINT ("remote write end\n");
      return;
    }

}

static void
remote_write_byte (struct device_desc *dev, u8 data)
{
  struct net_device *net_dev = (struct net_device *) dev->dev;
  struct net_rtl8019_io *io = (struct net_rtl8019_io *) dev->data;

  DBG_PRINT ("remote_write begin: data %d\n", data);
  if (io->CR & CMD_WRITE)
    {				//in remote write mode
      io->sram[io->remote_write_offset] = data;
      io->remote_write_offset++;
      io->remote_write_count--;


      if (io->remote_write_count == 0)
	{
	  io->CR &= (~CMD_WRITE);	//clear dma command in CR
	  io->CR |= CMD_NODMA;

	  io->ISR |= ISR_RDC;	// remote write finished int
	  if ((ISR_RDC & io->IMR))
	    {
	      net_rtl8019_set_update_intr (dev);
	    }
	}
      DBG_PRINT ("remote write end\n");
      return;
    }

}

static u16
remote_read_halfword (struct device_desc *dev)
{
  struct net_device *net_dev = (struct net_device *) dev->dev;
  struct net_rtl8019_io *io = (struct net_rtl8019_io *) dev->data;
  u16 data;

  DBG_PRINT ("remote read begin\n");

  if (io->CR & CMD_READ)
    {

      data = io->sram[io->remote_read_offset];
      data |= io->sram[io->remote_read_offset + 1] << 8;
      io->remote_read_offset += 2;

      io->remote_read_count -= 2;

      if (io->remote_read_count <= 0)
	{
	  io->CR &= (~CMD_READ);
	  io->CR |= CMD_NODMA;
	  io->ISR |= ISR_RDC;
	  if ((ISR_RDC & io->IMR))
	    {
	      net_rtl8019_set_update_intr (dev);
	    }
	}

      DBG_PRINT ("remote read end:data %d\n", data);
      return data;
    }
}

static u8
remote_read_byte (struct device_desc *dev)
{
  struct net_device *net_dev = (struct net_device *) dev->dev;
  struct net_rtl8019_io *io = (struct net_rtl8019_io *) dev->data;
  u8 data;

  DBG_PRINT ("remote read begin\n");

  if (io->CR & CMD_READ)
    {

      data = io->sram[io->remote_read_offset];
      io->remote_read_offset++;

      if (--io->remote_read_count == 0)
	{
	  io->CR &= (~CMD_READ);
	  io->CR |= CMD_NODMA;
	  io->ISR |= ISR_RDC;
	  if ((ISR_RDC & io->IMR))
	    {
	      net_rtl8019_set_update_intr (dev);
	    }
	}

      DBG_PRINT ("remote read end:data %d\n", data);
      return data;
    }
}

static void
net_rtl8019_fini (struct device_desc *dev)
{
  struct net_rtl8019_io *io = (struct net_rtl8019_io *) dev->data;
  free (dev->dev);
  free (io);
}

static void
net_rtl8019_reset (struct device_desc *dev)
{
  struct net_device *net_dev = (struct net_device *) dev->dev;
  struct net_rtl8019_io *io = (struct net_rtl8019_io *) dev->data;

  /*init PROM */
  io->PROM[0] = (u8) net_dev->macaddr[0];	//MACADDR0;
  io->PROM[1] = (u8) net_dev->macaddr[0];	//MACADDR0;
  io->PROM[2] = (u8) net_dev->macaddr[1];	//MACADDR1;
  io->PROM[3] = (u8) net_dev->macaddr[1];	//MACADDR1;
  io->PROM[4] = (u8) net_dev->macaddr[2];	//MACADDR2;
  io->PROM[5] = (u8) net_dev->macaddr[2];	//MACADDR2;
  io->PROM[6] = (u8) net_dev->macaddr[3];	//MACADDR3;
  io->PROM[7] = (u8) net_dev->macaddr[3];	//MACADDR3;
  io->PROM[8] = (u8) net_dev->macaddr[4];	//MACADDR4;
  io->PROM[9] = (u8) net_dev->macaddr[4];	//MACADDR4;
  io->PROM[10] = (u8) net_dev->macaddr[5];	//MACADDR5;
  io->PROM[11] = (u8) net_dev->macaddr[5];	//MACADDR5;

  io->PAR0 = io->PROM[0];
  io->PAR1 = io->PROM[2];
  io->PAR2 = io->PROM[4];
  io->PAR3 = io->PROM[6];
  io->PAR4 = io->PROM[8];
  io->PAR5 = io->PROM[10];

  //init Registers
  io->CR = 0x21;		//nic Stopped
  io->PSTART = 0;
  io->PSTOP = 0;
  io->BNRY = 0;
  io->TPSR = 0;
  io->TBCR0 = 0;
  io->TBCR1 = 0;
  io->ISR = 0;
  io->RSAR0 = 0;
  io->RSAR1 = 0;
  io->RBCR0 = 0;
  io->RBCR1 = 0;
  io->RCR = 0;
  io->TCR = 0;
  io->DCR = 0x84;		//set long addr bit
  io->IMR = 0;
  io->CURR = 0;

  /* raise reset interrupt */
  io->ISR = io->ISR | ISR_RST;

  /* init nic RAM */
  if (io->sram != NULL)
    {
      memset (io->sram, 0, PAGE_NUM * PAGE_SIZE);
    }
  else
    {
      io->sram = (u8 *) malloc (PAGE_NUM * PAGE_SIZE);
    }
  io->remote_read_offset = 0;
  io->remote_write_offset = 0;
  io->remote_read_count = 0;
  io->remote_write_count = 0;
  io->need_update = 0;
}

static void
net_rtl8019_update (struct device_desc *dev)
{
  struct device_interrupt *intr = &dev->intr;
  struct net_device *net_dev = (struct net_device *) dev->dev;
  struct net_rtl8019_io *io = (struct net_rtl8019_io *) dev->data;
  struct machine_config *mc = (struct machine_config *) dev->mach;
  if ((!mc->mach_pending_intr (intr->interrupts[INT_RTL8019])))
    {
      fd_set frds;
      struct timeval tv;
      int ret;
      FD_ZERO (&frds);
      FD_SET (net_dev->net_fd, &frds);
      tv.tv_sec = 0;
      tv.tv_usec = 0;
      if ((ret = select (net_dev->net_fd + 1, &frds, NULL, NULL, &tv)) > 0)
	{
	  if (FD_ISSET (net_dev->net_fd, &frds))
	    {
	      rtl8019_input (dev);
	    }
	}
    }

}



static int
net_rtl8019_read_halfword (struct device_desc *dev, u32 addr, u16 * data)
{
  struct net_device *net_dev = (struct net_device *) dev->dev;
  struct net_rtl8019_io *io = (struct net_rtl8019_io *) dev->data;

  int offset = (u8) (addr - dev->base);
  int ret = ADDR_HIT;
  //DBG_PRINT("nic read begin: offset %x, io->ISR %x\n",offset,io->ISR);

  if (offset == 0x10)
    {				//remote read
      if (io->DCR & 0x1)
	{
	  *data = remote_read_halfword (dev);
	}
    }
}

static int
net_rtl8019_read_byte (struct device_desc *dev, u32 addr, u8 * data)
{
  struct net_device *net_dev = (struct net_device *) dev->dev;
  struct net_rtl8019_io *io = (struct net_rtl8019_io *) dev->data;

  int offset = (u8) (addr - dev->base);
  int ret = ADDR_HIT;

  DBG_PRINT ("nic read begin: offset %x, io->ISR %x\n", offset, io->ISR);

  *data = 0;
  if (offset == 0x10)
    {				//remote read
      /* FIXME: don't use DCR here. */
      *data = remote_read_byte (dev);
      return ret;
    }
  if (offset == 0x1f)
    {				//reset
      net_rtl8019_reset (dev);
      return ret;
    }
  if ((io->CR >> 6) == 0)
    {				//read page0
      switch (offset)
	{
	case 0x00:		//CR
	  *data = io->CR;
	  break;

	case 0x03:		//BNRY
	  *data = io->BNRY;
	  break;
	case 0x04:		// ISR
	  *data = io->TSR;
	  break;
	case 0x07:		// ISR
	  *data = io->ISR;
	  break;
	case 0x0c:		// ISR
	  *data = io->RSR;
	  break;
	case 0x0d:		// ISR