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/* dma.h -- Definition of types and structures for DMA
   Copyright (C) 2001 by Erez Volk, erez@mailandnews.com
 
   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 dma_write( unsigned long addr, unsigned long value );
unsigned long dma_read( unsigned long addr );
 
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_acq_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_acq_o;
    unsigned dma_nd_i;
};
 
 
/* Implementation of DMA Controller Registers and State */
struct dma_controller
{
    /* Base address in memory */
    unsigned long baseaddr;
 
    /* 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];
};