/*
  ------------------------------------------------------------------------
  $Id$
  ------------------------------------------------------------------------
  
  My Right Boot, a boot ROM for embedded hardware.
 
  Copyright Cybertec Pty Ltd, 2000
  All rights reserved Cybertec Pty Ltd, 2000
  
  COPYRIGHT (c) 1989-1998.
  On-Line Applications Research Corporation (OAR).
  Copyright assigned to U.S. Government, 1994.

  The license and distribution terms for this file may be
  found in the file LICENSE in this distribution or at
  http://www.OARcorp.com/rtems/license.html.
  
  ------------------------------------------------------------------------

  CS8900 net boot driver.

 */

#include <bspIo.h>
#include <rtems.h>

#include <libchip/cs8900.h>

/*
 * Our local data.
 */

#ifdef CS8900_VERBOSE
static BOOLEAN cs8900_io_verbose;
#endif

static rtems_isr_void_entry old_handler[CS8900_DEVICES];
static void                 *old_parameter[CS8900_DEVICES];

/*
 * Tables of IO addresses and interrupt levels for each device attached.
 */

static const unsigned long ethernet_io_base[CS8900_DEVICES] =
{
  ETHERNET_BASE
};

static const unsigned long ethernet_mem_base[CS8900_DEVICES] =
{
  ETHERNET_BASE + CS8900_MEMORY_BASE
};

static const unsigned int ethernet_irq_level[CS8900_DEVICES] =
{
  ETHERNET_IRQ_LEVEL
};

static const unsigned int ethernet_irq_priority[CS8900_DEVICES] =
{
  ETHERNET_IRQ_PRIORITY
};

static const unsigned int ethernet_irq_vector[CS8900_DEVICES] =
{
  ETHERNET_IRQ_VECTOR,
};

void cs8900_io_set_reg (int dev, unsigned short reg, unsigned short data)
{
#ifdef CS8900_DATA_BUS_SWAPPED
  data = (data >> 8) | (data << 8);
#endif

#ifdef CS8900_VERBOSE
  if (cs8900_io_verbose)
    printf ("CS8900: io set reg=0x%04x, data=0x%04x\n", reg, data);
#endif
    
  WRITE_REGISTER_16 (ethernet_io_base[dev] + reg, data);
}

unsigned short cs8900_io_get_reg (int dev, unsigned short reg)
{
  unsigned long data;

  READ_REGISTER_16 (ethernet_io_base[dev] + reg, data);

#ifdef CS8900_DATA_BUS_SWAPPED
  data = (data >> 8) | (data << 8);
#endif
  
#ifdef CS8900_VERBOSE
  if (cs8900_io_verbose)
    printk ("CS8900: io get reg=0x%04x, data=0x%04x\n", reg, data);
#endif
  
  return data;
}

void cs8900_mem_set_reg (int dev, unsigned long reg, unsigned short data)
{
#ifdef CS8900_DATA_BUS_SWAPPED
  data = (data >> 8) | (data << 8);
#endif

#ifdef CS8900_VERBOSE
  if (cs8900_io_verbose)
    printk ("CS8900: mem set reg=0x%04x, data=0x%04x\n", reg, data);
#endif

  WRITE_REGISTER_16 (ethernet_io_base[dev] + reg, data);
}

unsigned short cs8900_mem_get_reg (int dev, unsigned long reg)
{
  unsigned short data;
  READ_REGISTER_16 (ethernet_io_base[dev] + reg, data);
  
#ifdef CS8900_DATA_BUS_SWAPPED
  data = (data >> 8) | (data << 8);
#endif

#ifdef CS8900_VERBOSE
  if (cs8900_io_verbose)
    printk ("CS8900: mem get reg=0x%04x, data=0x%04x\n", reg, data);
#endif

  return data;
}

void cs8900_put_data_block (int dev, int len, unsigned char *data)
{
#ifndef CS8900_DATA_BUS_SWAPPED
  unsigned short swap_word;
#endif
  unsigned short *src = (unsigned short *) ((unsigned long) data);
  unsigned short *dst = (unsigned short *) (ethernet_mem_base[dev] + CS8900_PP_TxFrameLoc);

  while (len > 1)
  {
#ifndef CS8900_DATA_BUS_SWAPPED
    swap_word = *src++;
    *dst++ = (swap_word >> 8) | (swap_word << 8);
#else
    *dst++ = *src++;
#endif
    len -= 2;
  }

  if (len)
  {
#ifndef CS8900_DATA_BUS_SWAPPED
    swap_word = *src++;
    *dst++ = (swap_word >> 8) | (swap_word << 8);
#else
    *dst++ = *src++;
#endif
  }  
}

unsigned short cs8900_get_data_block (int dev, unsigned char *data)
{
  unsigned short          swap_word;
  volatile unsigned short *src = (unsigned short *) (ethernet_mem_base[dev] + CS8900_PP_RxLength);
  unsigned short          *dst;
  unsigned short          len;
  unsigned short          rx_len;
  unsigned short          len_odd;
  
#ifdef CS8900_DATA_BUS_SWAPPED
    swap_word = *src++;
    len = (swap_word >> 8) | (swap_word << 8);
#else
    len = *src++;
#endif
    
  dst = (unsigned short *) ((unsigned long) data);

  len_odd = len & 1;
  rx_len  = len & ~1;
  
  for (; rx_len; rx_len -= 2)
  {
#ifndef CS8900_DATA_BUS_SWAPPED
    swap_word = *src++;
    *dst++ = (swap_word >> 8) | (swap_word << 8);
#else
    *dst++ = *src++;
#endif
  }

  if (len_odd)
  {
#ifndef CS8900_DATA_BUS_SWAPPED
    swap_word = *src++;
    *dst++ = (swap_word >> 8) | (swap_word << 8);
#else
    *dst++ = *src++;
#endif
  }

  return len;
}

void
cs8900_tx_load (int dev, struct mbuf *m)
{
  volatile unsigned short *dst = (unsigned short *) (ethernet_mem_base[dev] + CS8900_PP_TxFrameLoc);
  unsigned int            len;
  unsigned char           *src;
  int                     remainder = 0;
  unsigned char           remainder_data = '\0';
  
  while (m)
  {
    /*
     * We can get empty mbufs from the stack.
     */

    len = m->m_len;
    src = mtod (m, unsigned char*);

    if (len)
    {
      if (remainder)
      {
#ifndef CS8900_DATA_BUS_SWAPPED
        *dst++ = remainder_data | (*src++ << 8);
#else
        *dst++ = *src++ | (remainder_data << 8);
#endif
        len--;
        remainder = 0;
      }

      if (len & 1)
      {
        remainder = 1;
        len--;
      }
    
      for (; len; len -= 2)
#ifndef CS8900_DATA_BUS_SWAPPED
        *dst++ = (*src++) | (*(++src) << 8);
#else
      *dst++ = (*src++ << 8) | *(++src);
#endif
    
      if (remainder)
        remainder_data = *src++;
    }
    
    m = m->m_next;
  }

  if (remainder)
  {
#ifndef CS8900_DATA_BUS_SWAPPED
    *dst = (unsigned short) remainder_data;
#else
    *dst = (unsigned short) (remainder_data << 8);
#endif
  }
}

void cs8900_attach_interrupt (int dev, cs8900_device *cs)
{
  rtems_interrupt_catch_with_void (cs8900_interrupt, 
                                   ethernet_irq_vector[dev], 
                                   &old_handler[dev],
                                   cs,
                                   &old_parameter[dev]);
  
  CF_SIM_WRITE_ICR (CF_BASE, 
                    ethernet_irq_level[dev],
                    CF_SIM_ICR_AVEC_AUTO, 
                    ethernet_irq_level[dev], 
                    ethernet_irq_priority[dev]);
  CF_SIM_IMR_ENABLE (CF_BASE, 1 << ethernet_irq_level[dev]);
}

void cs8900_detach_interrupt (int dev)
{
  CF_SIM_IMR_DISABLE (CF_BASE, 1 << ethernet_irq_level[dev]);
  
  rtems_interrupt_catch_with_void (old_handler, 
                                   ethernet_irq_vector[dev], 
                                   NULL,
                                   old_parameter[dev],
                                   NULL);
}

void cs8900_get_mac_addr (int dev, unsigned char *mac_address)
{
  memcpy (mac_address, rct_get_mac_address (dev), 6);
}