URL https://opencores.org/ocsvn/openrisc/openrisc/trunk

Subversion Repositories openrisc

[/] [openrisc/] [trunk/] [or1ksim/] [peripheral/] [dma.c] - Blame information for rev 582

Go to most recent revision | Details | Compare with Previous | View Log


/* dma.c -- Simulation of DMA
 
   Copyright (C) 2001 by Erez Volk, erez@opencores.org
   Copyright (C) 2008 Embecosm Limited
 
   Contributor Jeremy Bennett <jeremy.bennett@embecosm.com>
 
   This file is part of Or1ksim, the OpenRISC 1000 Architectural Simulator.
 
   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/>.  */
 
/* This program is commented throughout in a fashion suitable for processing
   with Doxygen. */
 
/* This simulation of the DMA core is not meant to be full.  It is written
   only to allow simulating the Ethernet core.  Of course, if anyone feels
   like perfecting it, feel free...  */
 
 
/* Autoconf and/or portability configuration */
#include "config.h"
#include "port.h"
 
/* System includes */
#include <stdlib.h>
 
/* Package includes */
#include "dma.h"
#include "fields.h"
#include "abstract.h"
#include "sched.h"
#include "pic.h"
#include "toplevel-support.h"
#include "sim-cmd.h"
 
 
/* We keep a copy of all our controllers because we have to export an interface
 * to other peripherals eg. ethernet */
static struct dma_controller *dmas = NULL;
 
static unsigned long dma_read_ch_csr (struct dma_channel *channel);
static void dma_write_ch_csr (struct dma_channel *channel,
                              unsigned long value);
static void dma_load_descriptor (struct dma_channel *channel);
static void dma_init_transfer (struct dma_channel *channel);
static void dma_channel_terminate_transfer (struct dma_channel *channel,
                                            int generate_interrupt);
 
static void dma_channel_clock (void *dat);
 
static void masked_increase (oraddr_t * value, unsigned long mask);
 
#define CHANNEL_ND_I(ch) (TEST_FLAG(ch->regs.csr,DMA_CH_CSR,MODE) && TEST_FLAG(ch->regs.csr,DMA_CH_CSR,USE_ED) && ch->dma_nd_i)
 
 
/* Reset. Initializes all registers to default and places devices in memory address space. */
static void
dma_reset (void *dat)
{
  struct dma_controller *dma = dat;
  unsigned channel_number;
 
  memset (dma->ch, 0, sizeof (dma->ch));
 
  dma->regs.csr = 0;
  dma->regs.int_msk_a = 0;
  dma->regs.int_msk_b = 0;
  dma->regs.int_src_a = 0;
  dma->regs.int_src_b = 0;
 
  for (channel_number = 0; channel_number < DMA_NUM_CHANNELS;
       ++channel_number)
    {
      dma->ch[channel_number].controller = dma;
      dma->ch[channel_number].channel_number = channel_number;
      dma->ch[channel_number].channel_mask = 1LU << channel_number;
      dma->ch[channel_number].regs.am0 = dma->ch[channel_number].regs.am1 =
        0xFFFFFFFC;
    }
}
 
/* Print register values on stdout */
static void
dma_status (void *dat)
{
  unsigned j;
  struct dma_controller *dma = dat;
 
  if (dma->baseaddr == 0)
    return;
 
  PRINTF ("\nDMA controller at 0x%" PRIxADDR ":\n", dma->baseaddr);
  PRINTF ("CSR       : 0x%08lX\n", dma->regs.csr);
  PRINTF ("INT_MSK_A : 0x%08lX\n", dma->regs.int_msk_a);
  PRINTF ("INT_MSK_B : 0x%08lX\n", dma->regs.int_msk_b);
  PRINTF ("INT_SRC_A : 0x%08lX\n", dma->regs.int_src_a);
  PRINTF ("INT_SRC_B : 0x%08lX\n", dma->regs.int_src_b);
 
  for (j = 0; j < DMA_NUM_CHANNELS; ++j)
    {
      struct dma_channel *channel = &(dma->ch[j]);
      if (!channel->referenced)
        continue;
      PRINTF ("CH%u_CSR   : 0x%08lX\n", j, channel->regs.csr);
      PRINTF ("CH%u_SZ    : 0x%08lX\n", j, channel->regs.sz);
      PRINTF ("CH%u_A0    : 0x%08lX\n", j, channel->regs.a0);
      PRINTF ("CH%u_AM0   : 0x%08lX\n", j, channel->regs.am0);
      PRINTF ("CH%u_A1    : 0x%08lX\n", j, channel->regs.a1);
      PRINTF ("CH%u_AM1   : 0x%08lX\n", j, channel->regs.am1);
      PRINTF ("CH%u_DESC  : 0x%08lX\n", j, channel->regs.desc);
      PRINTF ("CH%u_SWPTR : 0x%08lX\n", j, channel->regs.swptr);
    }
}
 
 
/* Read a register */
static uint32_t
dma_read32 (oraddr_t addr, void *dat)
{
  struct dma_controller *dma = dat;
  uint32_t ret;
 
  if (addr < DMA_CH_BASE)
    {
      /* case of global (not per-channel) registers */
      switch (addr)
        {
        case DMA_CSR:
          return dma->regs.csr;
        case DMA_INT_MSK_A:
          return dma->regs.int_msk_a;
        case DMA_INT_MSK_B:
          return dma->regs.int_msk_b;
        case DMA_INT_SRC_A:
          if (dma->regs.int_src_a)
            clear_interrupt (dma->irq);
          ret = dma->regs.int_src_a;
          dma->regs.int_src_a = 0;
          return ret;
        case DMA_INT_SRC_B:
          return dma->regs.int_src_b;
        default:
          fprintf (stderr,
                   "dma_read32( 0x%" PRIxADDR " ): Illegal register\n",
                   addr + dma->baseaddr);
          return 0;
        }
    }
  else
    {
      /* case of per-channel registers */
      unsigned chno = (addr - DMA_CH_BASE) / DMA_CH_SIZE;
      addr = (addr - DMA_CH_BASE) % DMA_CH_SIZE;
      switch (addr)
        {
        case DMA_CH_CSR:
          return dma_read_ch_csr (&(dma->ch[chno]));
        case DMA_CH_SZ:
          return dma->ch[chno].regs.sz;
        case DMA_CH_A0:
          return dma->ch[chno].regs.a0;
        case DMA_CH_AM0:
          return dma->ch[chno].regs.am0;
        case DMA_CH_A1:
          return dma->ch[chno].regs.a1;
        case DMA_CH_AM1:
          return dma->ch[chno].regs.am1;
        case DMA_CH_DESC:
          return dma->ch[chno].regs.desc;
        case DMA_CH_SWPTR:
          return dma->ch[chno].regs.swptr;
        }
    }
  return 0;
}
 
 
/* Handle read from a channel CSR */
static unsigned long
dma_read_ch_csr (struct dma_channel *channel)
{
  unsigned long result = channel->regs.csr;
 
  /* before returning, clear all relevant bits */
  CLEAR_FLAG (channel->regs.csr, DMA_CH_CSR, INT_CHUNK_DONE);
  CLEAR_FLAG (channel->regs.csr, DMA_CH_CSR, INT_DONE);
  CLEAR_FLAG (channel->regs.csr, DMA_CH_CSR, INT_ERR);
  CLEAR_FLAG (channel->regs.csr, DMA_CH_CSR, ERR);
 
  return result;
}
 
 
 
/* Write a register */
static void
dma_write32 (oraddr_t addr, uint32_t value, void *dat)
{
  struct dma_controller *dma = dat;
 
  /* case of global (not per-channel) registers */
  if (addr < DMA_CH_BASE)
    {
      switch (addr)
        {
        case DMA_CSR:
          if (TEST_FLAG (value, DMA_CSR, PAUSE))
            fprintf (stderr, "dma: PAUSE not implemented\n");
          break;
 
        case DMA_INT_MSK_A:
          dma->regs.int_msk_a = value;
          break;
        case DMA_INT_MSK_B:
          dma->regs.int_msk_b = value;
          break;
        case DMA_INT_SRC_A:
          dma->regs.int_src_a = value;
          break;
        case DMA_INT_SRC_B:
          dma->regs.int_src_b = value;
          break;
        default:
          fprintf (stderr,
                   "dma_write32( 0x%" PRIxADDR " ): Illegal register\n",
                   addr + dma->baseaddr);
          return;
        }
    }
  else
    {
      /* case of per-channel registers */
      unsigned chno = (addr - DMA_CH_BASE) / DMA_CH_SIZE;
      struct dma_channel *channel = &(dma->ch[chno]);
      channel->referenced = 1;
      addr = (addr - DMA_CH_BASE) % DMA_CH_SIZE;
      switch (addr)
        {
        case DMA_CSR:
          dma_write_ch_csr (&(dma->ch[chno]), value);
          break;
        case DMA_CH_SZ:
          channel->regs.sz = value;
          break;
        case DMA_CH_A0:
          channel->regs.a0 = value;
          break;
        case DMA_CH_AM0:
          channel->regs.am0 = value;
          break;
        case DMA_CH_A1:
          channel->regs.a1 = value;
          break;
        case DMA_CH_AM1:
          channel->regs.am1 = value;
          break;
        case DMA_CH_DESC:
          channel->regs.desc = value;
          break;
        case DMA_CH_SWPTR:
          channel->regs.swptr = value;
          break;
        }
    }
}
 
 
/* Write a channel CSR
 * This ensures only the writable bits are modified.
 */
static void
dma_write_ch_csr (struct dma_channel *channel, unsigned long value)
{
  /* Check if we should *start* a transfer */
  if (!TEST_FLAG (channel->regs.csr, DMA_CH_CSR, CH_EN) &&
      TEST_FLAG (value, DMA_CH_CSR, CH_EN))
    SCHED_ADD (dma_channel_clock, channel, 1);
  else if (!TEST_FLAG (value, DMA_CH_CSR, CH_EN))
    /* The CH_EN flag is clear, check if we have a transfer in progress and
     * clear it */
    SCHED_FIND_REMOVE (dma_channel_clock, channel);
 
  /* Copy the writable bits to the channel CSR */
  channel->regs.csr &= ~DMA_CH_CSR_WRITE_MASK;
  channel->regs.csr |= value & DMA_CH_CSR_WRITE_MASK;
}
 
 
 
/* Clock tick for one channel on one DMA controller.
 * This does the actual "DMA" operation.
 * One chunk is transferred per clock.
 */
static void
dma_channel_clock (void *dat)
{
  struct dma_channel *channel = dat;
 
  /* Do we need to abort? */
  if (TEST_FLAG (channel->regs.csr, DMA_CH_CSR, STOP))
    {
      CLEAR_FLAG (channel->regs.csr, DMA_CH_CSR, CH_EN);
      CLEAR_FLAG (channel->regs.csr, DMA_CH_CSR, BUSY);
      SET_FLAG (channel->regs.csr, DMA_CH_CSR, ERR);
 
      if (TEST_FLAG (channel->regs.csr, DMA_CH_CSR, INE_ERR) &&
          (channel->controller->regs.int_msk_a & channel->channel_mask))
        {
          SET_FLAG (channel->regs.csr, DMA_CH_CSR, INT_ERR);
          channel->controller->regs.int_src_a = channel->channel_mask;
          report_interrupt (channel->controller->irq);
        }
 
      return;
    }
 
  /* In HW Handshake mode, only work when dma_req_i asserted */
  if (TEST_FLAG (channel->regs.csr, DMA_CH_CSR, MODE) && !channel->dma_req_i)
    {
      /* Reschedule */
      SCHED_ADD (dma_channel_clock, dat, 1);
      return;
    }
 
  /* If this is the first cycle of the transfer, initialize our state */
  if (!TEST_FLAG (channel->regs.csr, DMA_CH_CSR, BUSY))
    {
      CLEAR_FLAG (channel->regs.csr, DMA_CH_CSR, DONE);
      CLEAR_FLAG (channel->regs.csr, DMA_CH_CSR, ERR);
      SET_FLAG (channel->regs.csr, DMA_CH_CSR, BUSY);
 
      /* If using linked lists, copy the appropriate fields to our registers */
      if (TEST_FLAG (channel->regs.csr, DMA_CH_CSR, USE_ED))
        dma_load_descriptor (channel);
      else
        channel->load_next_descriptor_when_done = 0;
 
      /* Set our internal status */
      dma_init_transfer (channel);
 
      /* Might need to skip descriptor */
      if (CHANNEL_ND_I (channel))
        {
          dma_channel_terminate_transfer (channel, 0);
          return;
        }
    }
 
  /* Transfer one word */
  set_direct32 (channel->destination, eval_direct32 (channel->source, 0, 0),
                0, 0);
 
  /* Advance the source and destionation pointers */
  masked_increase (&(channel->source), channel->source_mask);
  masked_increase (&(channel->destination), channel->destination_mask);
  ++channel->words_transferred;
 
  /* Have we finished a whole chunk? */
  channel->dma_ack_o =
    (channel->words_transferred % channel->chunk_size == 0);
 
  /* When done with a chunk, check for dma_nd_i */
  if (CHANNEL_ND_I (channel))
    {
      dma_channel_terminate_transfer (channel, 0);
      return;
    }
 
  /* Are we done? */
  if (channel->words_transferred >= channel->total_size)
    {
      dma_channel_terminate_transfer (channel, 1);
      return;
    }
 
  /* Reschedule to transfer the next chunk */
  SCHED_ADD (dma_channel_clock, dat, 1);
}
 
 
/* Copy relevant valued from linked list descriptor to channel registers */
static void
dma_load_descriptor (struct dma_channel *channel)
{
  unsigned long desc_csr =
    eval_direct32 (channel->regs.desc + DMA_DESC_CSR, 0, 0);
 
  channel->load_next_descriptor_when_done =
    !TEST_FLAG (desc_csr, DMA_DESC_CSR, EOL);
 
  ASSIGN_FLAG (channel->regs.csr, DMA_CH_CSR, INC_SRC,
               TEST_FLAG (desc_csr, DMA_DESC_CSR, INC_SRC));
  ASSIGN_FLAG (channel->regs.csr, DMA_CH_CSR, INC_DST,
               TEST_FLAG (desc_csr, DMA_DESC_CSR, INC_DST));
  ASSIGN_FLAG (channel->regs.csr, DMA_CH_CSR, SRC_SEL,
               TEST_FLAG (desc_csr, DMA_DESC_CSR, SRC_SEL));
  ASSIGN_FLAG (channel->regs.csr, DMA_CH_CSR, DST_SEL,
               TEST_FLAG (desc_csr, DMA_DESC_CSR, DST_SEL));
 
  SET_FIELD (channel->regs.sz, DMA_CH_SZ, TOT_SZ,
             GET_FIELD (desc_csr, DMA_DESC_CSR, TOT_SZ));
 
  channel->regs.a0 = eval_direct32 (channel->regs.desc + DMA_DESC_ADR0, 0, 0);
  channel->regs.a1 = eval_direct32 (channel->regs.desc + DMA_DESC_ADR1, 0, 0);
 
  channel->current_descriptor = channel->regs.desc;
  channel->regs.desc =
    eval_direct32 (channel->regs.desc + DMA_DESC_NEXT, 0, 0);
}
 
 
/* Initialize internal parameters used to implement transfers */
static void
dma_init_transfer (struct dma_channel *channel)
{
  channel->source = channel->regs.a0;
  channel->destination = channel->regs.a1;
  channel->source_mask =
    TEST_FLAG (channel->regs.csr, DMA_CH_CSR,
               INC_SRC) ? channel->regs.am0 : 0;
  channel->destination_mask =
    TEST_FLAG (channel->regs.csr, DMA_CH_CSR,
               INC_DST) ? channel->regs.am1 : 0;
  channel->total_size = GET_FIELD (channel->regs.sz, DMA_CH_SZ, TOT_SZ);
  channel->chunk_size = GET_FIELD (channel->regs.sz, DMA_CH_SZ, CHK_SZ);
  if (!channel->chunk_size || (channel->chunk_size > channel->total_size))
    channel->chunk_size = channel->total_size;
  channel->words_transferred = 0;
}
 
 
/* Take care of transfer termination */
static void
dma_channel_terminate_transfer (struct dma_channel *channel,
                                int generate_interrupt)
{
  /* Might be working in a linked list */
  if (channel->load_next_descriptor_when_done)
    {
      dma_load_descriptor (channel);
      dma_init_transfer (channel);
      /* Reschedule */
      SCHED_ADD (dma_channel_clock, channel, 1);
      return;
    }
 
  /* Might be in auto-restart mode */
  if (TEST_FLAG (channel->regs.csr, DMA_CH_CSR, ARS))
    {
      dma_init_transfer (channel);
      return;
    }
 
  /* If needed, write amount of data transferred back to memory */
  if (TEST_FLAG (channel->regs.csr, DMA_CH_CSR, SZ_WB) &&
      TEST_FLAG (channel->regs.csr, DMA_CH_CSR, USE_ED))
    {
      /* TODO: What should we write back? Doc says "total number of remaining bytes" !? */
      unsigned long remaining_words =
        channel->total_size - channel->words_transferred;
      SET_FIELD (channel->regs.sz, DMA_DESC_CSR, TOT_SZ, remaining_words);
    }
 
  /* Mark end of transfer */
  CLEAR_FLAG (channel->regs.csr, DMA_CH_CSR, CH_EN);
  SET_FLAG (channel->regs.csr, DMA_CH_CSR, DONE);
  CLEAR_FLAG (channel->regs.csr, DMA_CH_CSR, ERR);
  CLEAR_FLAG (channel->regs.csr, DMA_CH_CSR, BUSY);
 
  /* If needed, generate interrupt */
  if (generate_interrupt)
    {
      /* TODO: Which channel should we interrupt? */
      if (TEST_FLAG (channel->regs.csr, DMA_CH_CSR, INE_DONE) &&
          (channel->controller->regs.int_msk_a & channel->channel_mask))
        {
          SET_FLAG (channel->regs.csr, DMA_CH_CSR, INT_DONE);
          channel->controller->regs.int_src_a = channel->channel_mask;
          report_interrupt (channel->controller->irq);
        }
    }
}
 
/* Utility function: Add 4 to a value with a mask */
static void
masked_increase (oraddr_t * value, unsigned long mask)
{
  *value = (*value & ~mask) | ((*value + 4) & mask);
}
 
/*-------------------------------------------[ DMA<->Peripheral interface ]---*/
/*
 * Simulation of control signals
 * To be used by simulations for other devices, e.g. ethernet
 */
 
void
set_dma_req_i (struct dma_channel *channel)
{
  channel->dma_req_i = 1;
}
 
void
clear_dma_req_i (struct dma_channel *channel)
{
  channel->dma_req_i = 0;
}
 
void
set_dma_nd_i (struct dma_channel *channel)
{
  channel->dma_nd_i = 1;
}
 
void
clear_dma_nd_i (struct dma_channel *channel)
{
  channel->dma_nd_i = 0;
}
 
unsigned
check_dma_ack_o (struct dma_channel *channel)
{
  return channel->dma_ack_o;
}
 
struct dma_channel *
find_dma_controller_ch (unsigned controller, unsigned channel)
{
  struct dma_controller *cur = dmas;
 
  while (cur && controller)
    {
      cur = cur->next;
      controller--;
    }
 
  if (!cur)
    return NULL;
 
  return &(cur->ch[channel]);
}
 
 
/*----------------------------------------------------[ DMA configuration ]---*/
static void
dma_baseaddr (union param_val val, void *dat)
{
  struct dma_controller *dma = dat;
  dma->baseaddr = val.addr_val;
}
 
static void
dma_irq (union param_val val, void *dat)
{
  struct dma_controller *dma = dat;
  dma->irq = val.int_val;
}
 
static void
dma_vapi_id (union param_val val, void *dat)
{
  struct dma_controller *dma = dat;
  dma->vapi_id = val.int_val;
}
 
static void
dma_enabled (union param_val val, void *dat)
{
  struct dma_controller *dma = dat;
  dma->enabled = val.int_val;
}
 
 
/*---------------------------------------------------------------------------*/
/*!Initialize a new DMA configuration
 
   ALL parameters are set explicitly to default values.                      */
/*---------------------------------------------------------------------------*/
static void *
dma_sec_start ()
{
  struct dma_controller *new = malloc (sizeof (struct dma_controller));
 
  if (!new)
    {
      fprintf (stderr, "Peripheral DMA: Run out of memory\n");
      exit (-1);
    }
 
  new->next = NULL;
  new->enabled  = 1;
  new->baseaddr = 0;
  new->irq      = 0;
  new->vapi_id  = 0;
 
  return new;
 
}       /* dma_sec_start() */
 
static void
dma_sec_end (void *dat)
{
  struct dma_controller *dma = dat;
  struct dma_controller *cur;
  struct mem_ops ops;
 
  if (!dma->enabled)
    {
      free (dat);
      return;
    }
 
  memset (&ops, 0, sizeof (struct mem_ops));
 
  ops.readfunc32 = dma_read32;
  ops.writefunc32 = dma_write32;
  ops.read_dat32 = dat;
  ops.write_dat32 = dat;
 
  /* FIXME: Correct delay?? */
  ops.delayr = 2;
  ops.delayw = 2;
 
  reg_mem_area (dma->baseaddr, DMA_ADDR_SPACE, 0, &ops);
  reg_sim_reset (dma_reset, dat);
  reg_sim_stat (dma_status, dat);
 
  if (dmas)
    {
      for (cur = dmas; cur->next; cur = cur->next);
      cur->next = dma;
    }
  else
    dmas = dma;
}
 
void
reg_dma_sec (void)
{
  struct config_section *sec =
    reg_config_sec ("dma", dma_sec_start, dma_sec_end);
 
  reg_config_param (sec, "enabled",  PARAMT_INT, dma_enabled);
  reg_config_param (sec, "baseaddr", PARAMT_ADDR, dma_baseaddr);
  reg_config_param (sec, "irq",      PARAMT_INT, dma_irq);
  reg_config_param (sec, "vapi_id",  PARAMT_ADDR, dma_vapi_id);
}

Browse

Tools

Subversion Repositories openrisc

[/] [openrisc/] [trunk/] [or1ksim/] [peripheral/] [dma.c] - Blame information for rev 582

Line No.	Rev	Author	Line
1	19	jeremybenn	`/* dma.c -- Simulation of DMA`
2
3			`Copyright (C) 2001 by Erez Volk, erez@opencores.org`
4			`Copyright (C) 2008 Embecosm Limited`
5
6			`Contributor Jeremy Bennett <jeremy.bennett@embecosm.com>`
7
8			`This file is part of Or1ksim, the OpenRISC 1000 Architectural Simulator.`
9
10			`This program is free software; you can redistribute it and/or modify it`
11			`under the terms of the GNU General Public License as published by the Free`
12			`Software Foundation; either version 3 of the License, or (at your option)`
13			`any later version.`
14
15			`This program is distributed in the hope that it will be useful, but WITHOUT`
16			`ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or`
17			`FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for`
18			`more details.`
19
20			`You should have received a copy of the GNU General Public License along`
21			`with this program. If not, see <http://www.gnu.org/licenses/>. */`
22
23			`/* This program is commented throughout in a fashion suitable for processing`
24			`with Doxygen. */`
25
26			`/* This simulation of the DMA core is not meant to be full. It is written`
27			`only to allow simulating the Ethernet core. Of course, if anyone feels`
28			`like perfecting it, feel free... */`
29
30
31			`/* Autoconf and/or portability configuration */`
32			`#include "config.h"`
33			`#include "port.h"`
34
35			`/* System includes */`
36			`#include <stdlib.h>`
37
38			`/* Package includes */`
39			`#include "dma.h"`
40			`#include "fields.h"`
41			`#include "abstract.h"`
42			`#include "sched.h"`
43			`#include "pic.h"`
44			`#include "toplevel-support.h"`
45			`#include "sim-cmd.h"`
46
47
48			`/* We keep a copy of all our controllers because we have to export an interface`
49			`* to other peripherals eg. ethernet */`
50			`static struct dma_controller *dmas = NULL;`
51
52			`static unsigned long dma_read_ch_csr (struct dma_channel *channel);`
53			`static void dma_write_ch_csr (struct dma_channel *channel,`
54			`unsigned long value);`
55			`static void dma_load_descriptor (struct dma_channel *channel);`
56			`static void dma_init_transfer (struct dma_channel *channel);`
57			`static void dma_channel_terminate_transfer (struct dma_channel *channel,`
58			`int generate_interrupt);`
59
60			`static void dma_channel_clock (void *dat);`
61
62			`static void masked_increase (oraddr_t * value, unsigned long mask);`
63
64			`#define CHANNEL_ND_I(ch) (TEST_FLAG(ch->regs.csr,DMA_CH_CSR,MODE) && TEST_FLAG(ch->regs.csr,DMA_CH_CSR,USE_ED) && ch->dma_nd_i)`
65
66
67			`/* Reset. Initializes all registers to default and places devices in memory address space. */`
68			`static void`
69			`dma_reset (void *dat)`
70			`{`
71			`struct dma_controller *dma = dat;`
72			`unsigned channel_number;`
73
74			`memset (dma->ch, 0, sizeof (dma->ch));`
75
76			`dma->regs.csr = 0;`
77			`dma->regs.int_msk_a = 0;`
78			`dma->regs.int_msk_b = 0;`
79			`dma->regs.int_src_a = 0;`
80			`dma->regs.int_src_b = 0;`
81
82			`for (channel_number = 0; channel_number < DMA_NUM_CHANNELS;`
83			`++channel_number)`
84			`{`
85			`dma->ch[channel_number].controller = dma;`
86			`dma->ch[channel_number].channel_number = channel_number;`
87			`dma->ch[channel_number].channel_mask = 1LU << channel_number;`
88			`dma->ch[channel_number].regs.am0 = dma->ch[channel_number].regs.am1 =`
89			`0xFFFFFFFC;`
90			`}`
91			`}`
92
93			`/* Print register values on stdout */`
94			`static void`
95			`dma_status (void *dat)`
96			`{`
97			`unsigned j;`
98			`struct dma_controller *dma = dat;`
99
100			`if (dma->baseaddr == 0)`
101			`return;`
102
103			`PRINTF ("\nDMA controller at 0x%" PRIxADDR ":\n", dma->baseaddr);`
104			`PRINTF ("CSR : 0x%08lX\n", dma->regs.csr);`
105			`PRINTF ("INT_MSK_A : 0x%08lX\n", dma->regs.int_msk_a);`
106			`PRINTF ("INT_MSK_B : 0x%08lX\n", dma->regs.int_msk_b);`
107			`PRINTF ("INT_SRC_A : 0x%08lX\n", dma->regs.int_src_a);`
108			`PRINTF ("INT_SRC_B : 0x%08lX\n", dma->regs.int_src_b);`
109
110			`for (j = 0; j < DMA_NUM_CHANNELS; ++j)`
111			`{`
112			`struct dma_channel *channel = &(dma->ch[j]);`
113			`if (!channel->referenced)`
114			`continue;`
115			`PRINTF ("CH%u_CSR : 0x%08lX\n", j, channel->regs.csr);`
116			`PRINTF ("CH%u_SZ : 0x%08lX\n", j, channel->regs.sz);`
117			`PRINTF ("CH%u_A0 : 0x%08lX\n", j, channel->regs.a0);`
118			`PRINTF ("CH%u_AM0 : 0x%08lX\n", j, channel->regs.am0);`
119			`PRINTF ("CH%u_A1 : 0x%08lX\n", j, channel->regs.a1);`
120			`PRINTF ("CH%u_AM1 : 0x%08lX\n", j, channel->regs.am1);`
121			`PRINTF ("CH%u_DESC : 0x%08lX\n", j, channel->regs.desc);`
122			`PRINTF ("CH%u_SWPTR : 0x%08lX\n", j, channel->regs.swptr);`
123			`}`
124			`}`
125
126
127			`/* Read a register */`
128			`static uint32_t`
129			`dma_read32 (oraddr_t addr, void *dat)`
130			`{`
131			`struct dma_controller *dma = dat;`
132			`uint32_t ret;`
133
134			`if (addr < DMA_CH_BASE)`
135			`{`
136			`/* case of global (not per-channel) registers */`
137			`switch (addr)`
138			`{`
139			`case DMA_CSR:`
140			`return dma->regs.csr;`
141			`case DMA_INT_MSK_A:`
142			`return dma->regs.int_msk_a;`
143			`case DMA_INT_MSK_B:`
144			`return dma->regs.int_msk_b;`
145			`case DMA_INT_SRC_A:`
146			`if (dma->regs.int_src_a)`
147			`clear_interrupt (dma->irq);`
148			`ret = dma->regs.int_src_a;`
149			`dma->regs.int_src_a = 0;`
150			`return ret;`
151			`case DMA_INT_SRC_B:`
152			`return dma->regs.int_src_b;`
153			`default:`
154			`fprintf (stderr,`
155			`"dma_read32( 0x%" PRIxADDR " ): Illegal register\n",`
156			`addr + dma->baseaddr);`
157			`return 0;`
158			`}`
159			`}`
160			`else`
161			`{`
162			`/* case of per-channel registers */`
163			`unsigned chno = (addr - DMA_CH_BASE) / DMA_CH_SIZE;`
164			`addr = (addr - DMA_CH_BASE) % DMA_CH_SIZE;`
165			`switch (addr)`
166			`{`
167			`case DMA_CH_CSR:`
168			`return dma_read_ch_csr (&(dma->ch[chno]));`
169			`case DMA_CH_SZ:`
170			`return dma->ch[chno].regs.sz;`
171			`case DMA_CH_A0:`
172			`return dma->ch[chno].regs.a0;`
173			`case DMA_CH_AM0:`
174			`return dma->ch[chno].regs.am0;`
175			`case DMA_CH_A1:`
176			`return dma->ch[chno].regs.a1;`
177			`case DMA_CH_AM1:`
178			`return dma->ch[chno].regs.am1;`
179			`case DMA_CH_DESC:`
180			`return dma->ch[chno].regs.desc;`
181			`case DMA_CH_SWPTR:`
182			`return dma->ch[chno].regs.swptr;`
183			`}`
184			`}`
185			`return 0;`
186			`}`
187
188
189			`/* Handle read from a channel CSR */`
190			`static unsigned long`
191			`dma_read_ch_csr (struct dma_channel *channel)`
192			`{`
193			`unsigned long result = channel->regs.csr;`
194
195			`/* before returning, clear all relevant bits */`
196			`CLEAR_FLAG (channel->regs.csr, DMA_CH_CSR, INT_CHUNK_DONE);`
197			`CLEAR_FLAG (channel->regs.csr, DMA_CH_CSR, INT_DONE);`
198			`CLEAR_FLAG (channel->regs.csr, DMA_CH_CSR, INT_ERR);`
199			`CLEAR_FLAG (channel->regs.csr, DMA_CH_CSR, ERR);`
200
201			`return result;`
202			`}`
203
204
205
206			`/* Write a register */`
207			`static void`
208			`dma_write32 (oraddr_t addr, uint32_t value, void *dat)`
209			`{`
210			`struct dma_controller *dma = dat;`
211
212			`/* case of global (not per-channel) registers */`
213			`if (addr < DMA_CH_BASE)`
214			`{`
215			`switch (addr)`
216			`{`
217			`case DMA_CSR:`
218			`if (TEST_FLAG (value, DMA_CSR, PAUSE))`
219			`fprintf (stderr, "dma: PAUSE not implemented\n");`
220			`break;`
221
222			`case DMA_INT_MSK_A:`
223			`dma->regs.int_msk_a = value;`
224			`break;`
225			`case DMA_INT_MSK_B:`
226			`dma->regs.int_msk_b = value;`
227			`break;`
228			`case DMA_INT_SRC_A:`
229			`dma->regs.int_src_a = value;`
230			`break;`
231			`case DMA_INT_SRC_B:`
232			`dma->regs.int_src_b = value;`
233			`break;`
234			`default:`
235			`fprintf (stderr,`
236			`"dma_write32( 0x%" PRIxADDR " ): Illegal register\n",`
237			`addr + dma->baseaddr);`
238			`return;`
239			`}`
240			`}`
241			`else`
242			`{`
243			`/* case of per-channel registers */`
244			`unsigned chno = (addr - DMA_CH_BASE) / DMA_CH_SIZE;`
245			`struct dma_channel *channel = &(dma->ch[chno]);`
246			`channel->referenced = 1;`
247			`addr = (addr - DMA_CH_BASE) % DMA_CH_SIZE;`
248			`switch (addr)`
249			`{`
250			`case DMA_CSR:`
251			`dma_write_ch_csr (&(dma->ch[chno]), value);`
252			`break;`
253			`case DMA_CH_SZ:`
254			`channel->regs.sz = value;`
255			`break;`
256			`case DMA_CH_A0:`
257			`channel->regs.a0 = value;`
258			`break;`
259			`case DMA_CH_AM0:`
260			`channel->regs.am0 = value;`
261			`break;`
262			`case DMA_CH_A1:`
263			`channel->regs.a1 = value;`
264			`break;`
265			`case DMA_CH_AM1:`
266			`channel->regs.am1 = value;`
267			`break;`
268			`case DMA_CH_DESC:`
269			`channel->regs.desc = value;`
270			`break;`
271			`case DMA_CH_SWPTR:`
272			`channel->regs.swptr = value;`
273			`break;`
274			`}`
275			`}`
276			`}`
277
278
279			`/* Write a channel CSR`
280			`* This ensures only the writable bits are modified.`
281			`*/`
282			`static void`
283			`dma_write_ch_csr (struct dma_channel *channel, unsigned long value)`
284			`{`
285			`/* Check if we should start a transfer */`
286			`if (!TEST_FLAG (channel->regs.csr, DMA_CH_CSR, CH_EN) &&`
287			`TEST_FLAG (value, DMA_CH_CSR, CH_EN))`
288			`SCHED_ADD (dma_channel_clock, channel, 1);`
289			`else if (!TEST_FLAG (value, DMA_CH_CSR, CH_EN))`
290			`/* The CH_EN flag is clear, check if we have a transfer in progress and`
291			`* clear it */`
292			`SCHED_FIND_REMOVE (dma_channel_clock, channel);`
293
294			`/* Copy the writable bits to the channel CSR */`
295			`channel->regs.csr &= ~DMA_CH_CSR_WRITE_MASK;`
296			`channel->regs.csr \|= value & DMA_CH_CSR_WRITE_MASK;`
297			`}`
298
299
300
301			`/* Clock tick for one channel on one DMA controller.`
302			`* This does the actual "DMA" operation.`
303			`* One chunk is transferred per clock.`
304			`*/`
305			`static void`
306			`dma_channel_clock (void *dat)`
307			`{`
308			`struct dma_channel *channel = dat;`
309
310			`/* Do we need to abort? */`
311			`if (TEST_FLAG (channel->regs.csr, DMA_CH_CSR, STOP))`
312			`{`
313			`CLEAR_FLAG (channel->regs.csr, DMA_CH_CSR, CH_EN);`
314			`CLEAR_FLAG (channel->regs.csr, DMA_CH_CSR, BUSY);`
315			`SET_FLAG (channel->regs.csr, DMA_CH_CSR, ERR);`
316
317			`if (TEST_FLAG (channel->regs.csr, DMA_CH_CSR, INE_ERR) &&`
318			`(channel->controller->regs.int_msk_a & channel->channel_mask))`
319			`{`
320			`SET_FLAG (channel->regs.csr, DMA_CH_CSR, INT_ERR);`
321			`channel->controller->regs.int_src_a = channel->channel_mask;`
322			`report_interrupt (channel->controller->irq);`
323			`}`
324
325			`return;`
326			`}`
327
328			`/* In HW Handshake mode, only work when dma_req_i asserted */`
329			`if (TEST_FLAG (channel->regs.csr, DMA_CH_CSR, MODE) && !channel->dma_req_i)`
330			`{`
331			`/* Reschedule */`
332			`SCHED_ADD (dma_channel_clock, dat, 1);`
333			`return;`
334			`}`
335
336			`/* If this is the first cycle of the transfer, initialize our state */`
337			`if (!TEST_FLAG (channel->regs.csr, DMA_CH_CSR, BUSY))`
338			`{`
339			`CLEAR_FLAG (channel->regs.csr, DMA_CH_CSR, DONE);`
340			`CLEAR_FLAG (channel->regs.csr, DMA_CH_CSR, ERR);`
341			`SET_FLAG (channel->regs.csr, DMA_CH_CSR, BUSY);`
342
343			`/* If using linked lists, copy the appropriate fields to our registers */`
344			`if (TEST_FLAG (channel->regs.csr, DMA_CH_CSR, USE_ED))`
345			`dma_load_descriptor (channel);`
346			`else`
347			`channel->load_next_descriptor_when_done = 0;`
348
349			`/* Set our internal status */`
350			`dma_init_transfer (channel);`
351
352			`/* Might need to skip descriptor */`
353			`if (CHANNEL_ND_I (channel))`
354			`{`
355			`dma_channel_terminate_transfer (channel, 0);`
356			`return;`
357			`}`
358			`}`
359
360			`/* Transfer one word */`
361			`set_direct32 (channel->destination, eval_direct32 (channel->source, 0, 0),`
362			`0, 0);`
363
364			`/* Advance the source and destionation pointers */`
365			`masked_increase (&(channel->source), channel->source_mask);`
366			`masked_increase (&(channel->destination), channel->destination_mask);`
367			`++channel->words_transferred;`
368
369			`/* Have we finished a whole chunk? */`
370			`channel->dma_ack_o =`
371			`(channel->words_transferred % channel->chunk_size == 0);`
372
373			`/* When done with a chunk, check for dma_nd_i */`
374			`if (CHANNEL_ND_I (channel))`
375			`{`
376			`dma_channel_terminate_transfer (channel, 0);`
377			`return;`
378			`}`
379
380			`/* Are we done? */`
381			`if (channel->words_transferred >= channel->total_size)`
382			`{`
383			`dma_channel_terminate_transfer (channel, 1);`
384			`return;`
385			`}`
386
387			`/* Reschedule to transfer the next chunk */`
388			`SCHED_ADD (dma_channel_clock, dat, 1);`
389			`}`
390
391
392			`/* Copy relevant valued from linked list descriptor to channel registers */`
393			`static void`
394			`dma_load_descriptor (struct dma_channel *channel)`
395			`{`
396			`unsigned long desc_csr =`
397			`eval_direct32 (channel->regs.desc + DMA_DESC_CSR, 0, 0);`
398
399			`channel->load_next_descriptor_when_done =`
400			`!TEST_FLAG (desc_csr, DMA_DESC_CSR, EOL);`
401
402			`ASSIGN_FLAG (channel->regs.csr, DMA_CH_CSR, INC_SRC,`
403			`TEST_FLAG (desc_csr, DMA_DESC_CSR, INC_SRC));`
404			`ASSIGN_FLAG (channel->regs.csr, DMA_CH_CSR, INC_DST,`
405			`TEST_FLAG (desc_csr, DMA_DESC_CSR, INC_DST));`
406			`ASSIGN_FLAG (channel->regs.csr, DMA_CH_CSR, SRC_SEL,`
407			`TEST_FLAG (desc_csr, DMA_DESC_CSR, SRC_SEL));`
408			`ASSIGN_FLAG (channel->regs.csr, DMA_CH_CSR, DST_SEL,`
409			`TEST_FLAG (desc_csr, DMA_DESC_CSR, DST_SEL));`
410
411			`SET_FIELD (channel->regs.sz, DMA_CH_SZ, TOT_SZ,`
412			`GET_FIELD (desc_csr, DMA_DESC_CSR, TOT_SZ));`
413
414			`channel->regs.a0 = eval_direct32 (channel->regs.desc + DMA_DESC_ADR0, 0, 0);`
415			`channel->regs.a1 = eval_direct32 (channel->regs.desc + DMA_DESC_ADR1, 0, 0);`
416
417			`channel->current_descriptor = channel->regs.desc;`
418			`channel->regs.desc =`
419			`eval_direct32 (channel->regs.desc + DMA_DESC_NEXT, 0, 0);`
420			`}`
421
422
423			`/* Initialize internal parameters used to implement transfers */`
424			`static void`
425			`dma_init_transfer (struct dma_channel *channel)`
426			`{`
427			`channel->source = channel->regs.a0;`
428			`channel->destination = channel->regs.a1;`
429			`channel->source_mask =`
430			`TEST_FLAG (channel->regs.csr, DMA_CH_CSR,`
431			`INC_SRC) ? channel->regs.am0 : 0;`
432			`channel->destination_mask =`
433			`TEST_FLAG (channel->regs.csr, DMA_CH_CSR,`
434			`INC_DST) ? channel->regs.am1 : 0;`
435			`channel->total_size = GET_FIELD (channel->regs.sz, DMA_CH_SZ, TOT_SZ);`
436			`channel->chunk_size = GET_FIELD (channel->regs.sz, DMA_CH_SZ, CHK_SZ);`
437			`if (!channel->chunk_size \|\| (channel->chunk_size > channel->total_size))`
438			`channel->chunk_size = channel->total_size;`
439			`channel->words_transferred = 0;`
440			`}`
441
442
443			`/* Take care of transfer termination */`
444			`static void`
445			`dma_channel_terminate_transfer (struct dma_channel *channel,`
446			`int generate_interrupt)`
447			`{`
448			`/* Might be working in a linked list */`
449			`if (channel->load_next_descriptor_when_done)`
450			`{`
451			`dma_load_descriptor (channel);`
452			`dma_init_transfer (channel);`
453			`/* Reschedule */`
454			`SCHED_ADD (dma_channel_clock, channel, 1);`
455			`return;`
456			`}`
457
458			`/* Might be in auto-restart mode */`
459			`if (TEST_FLAG (channel->regs.csr, DMA_CH_CSR, ARS))`
460			`{`
461			`dma_init_transfer (channel);`
462			`return;`
463			`}`
464
465			`/* If needed, write amount of data transferred back to memory */`
466			`if (TEST_FLAG (channel->regs.csr, DMA_CH_CSR, SZ_WB) &&`
467			`TEST_FLAG (channel->regs.csr, DMA_CH_CSR, USE_ED))`
468			`{`
469			`/* TODO: What should we write back? Doc says "total number of remaining bytes" !? */`
470			`unsigned long remaining_words =`
471			`channel->total_size - channel->words_transferred;`
472			`SET_FIELD (channel->regs.sz, DMA_DESC_CSR, TOT_SZ, remaining_words);`
473			`}`
474
475			`/* Mark end of transfer */`
476			`CLEAR_FLAG (channel->regs.csr, DMA_CH_CSR, CH_EN);`
477			`SET_FLAG (channel->regs.csr, DMA_CH_CSR, DONE);`
478			`CLEAR_FLAG (channel->regs.csr, DMA_CH_CSR, ERR);`
479			`CLEAR_FLAG (channel->regs.csr, DMA_CH_CSR, BUSY);`
480
481			`/* If needed, generate interrupt */`
482			`if (generate_interrupt)`
483			`{`
484			`/* TODO: Which channel should we interrupt? */`
485			`if (TEST_FLAG (channel->regs.csr, DMA_CH_CSR, INE_DONE) &&`
486			`(channel->controller->regs.int_msk_a & channel->channel_mask))`
487			`{`
488			`SET_FLAG (channel->regs.csr, DMA_CH_CSR, INT_DONE);`
489			`channel->controller->regs.int_src_a = channel->channel_mask;`
490			`report_interrupt (channel->controller->irq);`
491			`}`
492			`}`
493			`}`
494
495			`/* Utility function: Add 4 to a value with a mask */`
496			`static void`
497			`masked_increase (oraddr_t * value, unsigned long mask)`
498			`{`
499			`value = (value & ~mask) \| ((*value + 4) & mask);`
500			`}`
501
502			`/-------------------------------------------[ DMA<->Peripheral interface ]---/`
503			`/*`
504			`* Simulation of control signals`
505			`* To be used by simulations for other devices, e.g. ethernet`
506			`*/`
507
508			`void`
509			`set_dma_req_i (struct dma_channel *channel)`
510			`{`
511			`channel->dma_req_i = 1;`
512			`}`
513
514			`void`
515			`clear_dma_req_i (struct dma_channel *channel)`
516			`{`
517			`channel->dma_req_i = 0;`
518			`}`
519
520			`void`
521			`set_dma_nd_i (struct dma_channel *channel)`
522			`{`
523			`channel->dma_nd_i = 1;`
524			`}`
525
526			`void`
527			`clear_dma_nd_i (struct dma_channel *channel)`
528			`{`
529			`channel->dma_nd_i = 0;`
530			`}`
531
532			`unsigned`
533			`check_dma_ack_o (struct dma_channel *channel)`
534			`{`
535			`return channel->dma_ack_o;`
536			`}`
537
538			`struct dma_channel *`
539			`find_dma_controller_ch (unsigned controller, unsigned channel)`
540			`{`
541			`struct dma_controller *cur = dmas;`
542
543			`while (cur && controller)`
544			`{`
545			`cur = cur->next;`
546			`controller--;`
547			`}`
548
549			`if (!cur)`
550			`return NULL;`
551
552			`return &(cur->ch[channel]);`
553			`}`
554
555
556			`/----------------------------------------------------[ DMA configuration ]---/`
557			`static void`
558			`dma_baseaddr (union param_val val, void *dat)`
559			`{`
560			`struct dma_controller *dma = dat;`
561			`dma->baseaddr = val.addr_val;`
562			`}`
563
564			`static void`
565			`dma_irq (union param_val val, void *dat)`
566			`{`
567			`struct dma_controller *dma = dat;`
568			`dma->irq = val.int_val;`
569			`}`
570
571			`static void`
572			`dma_vapi_id (union param_val val, void *dat)`
573			`{`
574			`struct dma_controller *dma = dat;`
575			`dma->vapi_id = val.int_val;`
576			`}`
577
578			`static void`
579			`dma_enabled (union param_val val, void *dat)`
580			`{`
581			`struct dma_controller *dma = dat;`
582			`dma->enabled = val.int_val;`
583			`}`
584
585
586			`/---------------------------------------------------------------------------/`
587			`/*!Initialize a new DMA configuration`
588
589			`ALL parameters are set explicitly to default values. */`
590			`/---------------------------------------------------------------------------/`
591			`static void *`
592			`dma_sec_start ()`
593			`{`
594			`struct dma_controller *new = malloc (sizeof (struct dma_controller));`
595
596			`if (!new)`
597			`{`
598			`fprintf (stderr, "Peripheral DMA: Run out of memory\n");`
599			`exit (-1);`
600			`}`
601
602			`new->next = NULL;`
603			`new->enabled = 1;`
604			`new->baseaddr = 0;`
605			`new->irq = 0;`
606			`new->vapi_id = 0;`
607
608			`return new;`
609
610			`} /* dma_sec_start() */`
611
612			`static void`
613			`dma_sec_end (void *dat)`
614			`{`
615			`struct dma_controller *dma = dat;`
616			`struct dma_controller *cur;`
617			`struct mem_ops ops;`
618
619			`if (!dma->enabled)`
620			`{`
621			`free (dat);`
622			`return;`
623			`}`
624
625			`memset (&ops, 0, sizeof (struct mem_ops));`
626
627			`ops.readfunc32 = dma_read32;`
628			`ops.writefunc32 = dma_write32;`
629			`ops.read_dat32 = dat;`
630			`ops.write_dat32 = dat;`
631
632			`/* FIXME: Correct delay?? */`
633			`ops.delayr = 2;`
634			`ops.delayw = 2;`
635
636			`reg_mem_area (dma->baseaddr, DMA_ADDR_SPACE, 0, &ops);`
637			`reg_sim_reset (dma_reset, dat);`
638			`reg_sim_stat (dma_status, dat);`
639
640			`if (dmas)`
641			`{`
642			`for (cur = dmas; cur->next; cur = cur->next);`
643			`cur->next = dma;`
644			`}`
645			`else`
646			`dmas = dma;`
647			`}`
648
649			`void`
650			`reg_dma_sec (void)`
651			`{`
652			`struct config_section *sec =`
653			`reg_config_sec ("dma", dma_sec_start, dma_sec_end);`
654
655	224	jeremybenn	`reg_config_param (sec, "enabled", PARAMT_INT, dma_enabled);`
656			`reg_config_param (sec, "baseaddr", PARAMT_ADDR, dma_baseaddr);`
657			`reg_config_param (sec, "irq", PARAMT_INT, dma_irq);`
658			`reg_config_param (sec, "vapi_id", PARAMT_ADDR, dma_vapi_id);`
659	19	jeremybenn	`}`