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/* dma.h -- Definition of types and structures for DMA

   Copyright (C) 2001 by Erez Volk, erez@opencores.org

   This file is part of 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 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., 675 Mass Ave, Cambridge, MA 02139, USA.

*/

/* Exported function prototypes */

void dma_reset( void );

void dma_clock( void );

void set_dma_req_i( unsigned dma_controller, unsigned channel );

void clear_dma_req_i( unsigned dma_controller, unsigned channel );

void set_dma_nd_i( unsigned dma_controller, unsigned channel );

void clear_dma_nd_i( unsigned dma_controller, unsigned channel );

unsigned check_dma_ack_o( unsigned dma_controller, unsigned channel );

/* Number of channel per DMA controller */

#define DMA_NUM_CHANNELS 31

/* Address space required by one DMA controller */

#define DMA_ADDR_SPACE 0x400

/* Relative Register Addresses */

#define DMA_CSR       0x00

#define DMA_INT_MSK_A 0x04

#define DMA_INT_MSK_B 0x08

#define DMA_INT_SRC_A 0x0C

#define DMA_INT_SRC_B 0x10

/* Channel registers definitions */

#define DMA_CH_BASE 0x20 /* Offset of first channel registers */

#define DMA_CH_SIZE 0x20 /* Per-channel address space */

/* Per-channel Register Addresses, relative to channel start */

#define DMA_CH_CSR   0x00

#define DMA_CH_SZ    0x04

#define DMA_CH_A0    0x08

#define DMA_CH_AM0   0x0C

#define DMA_CH_A1    0x10

#define DMA_CH_AM1   0x14

#define DMA_CH_DESC  0x18

#define DMA_CH_SWPTR 0x1C

/* Field Definitions for the Main CSR */

#define DMA_CSR_PAUSE_OFFSET             0

/* Field Definitions for the Channel CSR(s) */

#define DMA_CH_CSR_CH_EN_OFFSET          0

#define DMA_CH_CSR_DST_SEL_OFFSET        1

#define DMA_CH_CSR_SRC_SEL_OFFSET        2

#define DMA_CH_CSR_INC_DST_OFFSET        3

#define DMA_CH_CSR_INC_SRC_OFFSET        4

#define DMA_CH_CSR_MODE_OFFSET           5

#define DMA_CH_CSR_ARS_OFFSET            6

#define DMA_CH_CSR_USE_ED_OFFSET         7

#define DMA_CH_CSR_SZ_WB_OFFSET          8

#define DMA_CH_CSR_STOP_OFFSET           9

#define DMA_CH_CSR_BUSY_OFFSET           10  

#define DMA_CH_CSR_DONE_OFFSET           11

#define DMA_CH_CSR_ERR_OFFSET            12

#define DMA_CH_CSR_PRIORITY_OFFSET       13

#define DMA_CH_CSR_PRIORITY_WIDTH        3

#define DMA_CH_CSR_REST_EN_OFFSET        16

#define DMA_CH_CSR_INE_ERR_OFFSET        17

#define DMA_CH_CSR_INE_DONE_OFFSET       18

#define DMA_CH_CSR_INE_CHK_DONE_OFFSET   19 

#define DMA_CH_CSR_INT_ERR_OFFSET        20

#define DMA_CH_CSR_INT_DONE_OFFSET       21

#define DMA_CH_CSR_INT_CHUNK_DONE_OFFSET 22

#define DMA_CH_CSR_RESERVED_OFFSET       23

#define DMA_CH_CSR_RESERVED_WIDTH        9

/* Masks -- Writable and readonly parts of the register */

#define DMA_CH_CSR_WRITE_MASK            0x000FE3FF

/* Field definitions for Channel Size Registers */

#define DMA_CH_SZ_TOT_SZ_OFFSET          0

#define DMA_CH_SZ_TOT_SZ_WIDTH           12

#define DMA_CH_SZ_CHK_SZ_OFFSET          16

#define DMA_CH_SZ_CHK_SZ_WIDTH           9

/* Field definitions for Channel Address Registers CHn_Am */

#define DMA_CH_A0_ADDR_OFFSET            2

#define DMA_CH_A0_ADDR_WIDTH             30

#define DMA_CH_A1_ADDR_OFFSET            2

#define DMA_CH_A1_ADDR_WIDTH             30

/* Field definitions for Channel Address Mask Registers CHn_AMm */

#define DMA_CH_AM0_MASK_OFFSET           4

#define DMA_CH_AM0_MASK_WIDTH            28

#define DMA_CH_AM1_MASK_OFFSET           4

#define DMA_CH_AM1_MASK_WIDTH            28

/* Field definitions for Channel Linked List descriptor Pointer CHn_DESC */

#define DMA_CH_DESC_ADDR_OFFSET          2

#define DMA_CH_DESC_ADDR_WIDTH           30

/* Field definitions for Channel Software Pointer */

#define DMA_CH_SWPTR_PTR_OFFSET          2

#define DMA_CH_SWPTR_PTR_WIDTH           29

#define DMA_CH_SWPTR_EN_OFFSET           31

/* Structure of linked list descriptors (offsets of elements)  */

#define DMA_DESC_CSR                     0x00

#define DMA_DESC_ADR0                    0x04

#define DMA_DESC_ADR1                    0x08

#define DMA_DESC_NEXT                    0x0C

/* Field definitions for linked list descriptor DESC_CSR */

#define DMA_DESC_CSR_EOL_OFFSET          20

#define DMA_DESC_CSR_INC_SRC_OFFSET      19

#define DMA_DESC_CSR_INC_DST_OFFSET      18

#define DMA_DESC_CSR_SRC_SEL_OFFSET      17

#define DMA_DESC_CSR_DST_SEL_OFFSET      16

#define DMA_DESC_CSR_TOT_SZ_OFFSET       0

#define DMA_DESC_CSR_TOT_SZ_WIDTH        12

/* Implementation of DMA Channel Registers and State */

struct dma_channel

{

  /* The controller we belong to */

  struct dma_controller *controller;

  /* Our channel number and bit mask */

  unsigned channel_number;

  unsigned long channel_mask;

  /* Used for dump, to save dumping all 32 channels */

  unsigned referenced;

  /* Inner state of transfer etc. */

  unsigned load_next_descriptor_when_done;

  unsigned long current_descriptor;

  unsigned long source, destination, source_mask, destination_mask;

  unsigned long chunk_size, total_size, words_transferred;

  /* The interface registers */

  struct

  {

    unsigned long csr;

    unsigned long sz;

    unsigned long a0;

    unsigned long am0;

    unsigned long a1;

    unsigned long am1;

    unsigned long desc;

    unsigned long swptr;

  } regs;

  /* Some control signals */

  unsigned dma_req_i;

  unsigned dma_ack_o;

  unsigned dma_nd_i;

};

/* Implementation of DMA Controller Registers and State */

struct dma_controller

{

  /* Base address in memory */

  unsigned long baseaddr;

  /* Which interrupt number we generate */

  unsigned irq;

  /* Controller Registers */

  struct

  {

    unsigned long csr;

    unsigned long int_msk_a;

    unsigned long int_msk_b;

    unsigned long int_src_a;

    unsigned long int_src_b;

  } regs;

  /* Channels */

  struct dma_channel ch[DMA_NUM_CHANNELS];

};