/**

  * $Id$

  * 

  * DMA support code

  *

  * Copyright (c) 2006 Nathan Keynes.

  *

  * 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.

  */

 #include "dma.h"

 #include "asic.h"

 #define DMA_BASE 0xFFA00000

 #define DMA_SAR(c) (DMA_BASE+0x00+(c<<4))

 #define DMA_DAR(c) (DMA_BASE+0x04+(c<<4))

 #define DMA_TCR(c) (DMA_BASE+0x08+(c<<4))

 #define DMA_CHCR(c) (DMA_BASE+0x0C+(c<<4))

 #define DMA_OR (DMA_BASE+0x40)

 #define ASIC_BASE 0xA05F6000

 #define PVR_DMA_DEST  (ASIC_BASE+0x800)

 #define PVR_DMA_COUNT (ASIC_BASE+0x804)

 #define PVR_DMA_CTL   (ASIC_BASE+0x808)

 #define PVR_DMA_REGION (ASIC_BASE+0x884)

 #define SORT_DMA_TABLE (ASIC_BASE+0x810)

 #define SORT_DMA_DATA  (ASIC_BASE+0x814)

 #define SORT_DMA_TABLEBITS (ASIC_BASE+0x818)

 #define SORT_DMA_DATASIZE (ASIC_BASE+0x81C)

 #define SORT_DMA_CTL   (ASIC_BASE+0x820)

 #define SORT_DMA_COUNT (ASIC_BASE+0x860)

 void dmac_dump_channel( FILE *f, unsigned int channel )

 {

     fprintf( f, "DMAC SAR: %08X  Count: %08X  Ctl: %08X  OR: %08X\n",

 	     long_read(DMA_SAR(channel)), long_read(DMA_TCR(channel)), 

 	     long_read(DMA_CHCR(channel)), long_read(DMA_OR) );

 }

 /**

  * Setup the DMAC for a transfer. Assumes 32-byte block transfer.

  * Caller is responsible for making sure no-one else is using the

  * channel already. 

  *

  * @param channel DMA channel to use, 0 to 3

  * @param source source address (if a memory source)

  * @param dest   destination address (if a memory destination)

  * @param length number of bytes to transfer (must be a multiple of

  *               32.

  * @param direction 0 = host to device, 1 = device to host

  */

 void dmac_prepare_channel( int channel, uint32_t source, uint32_t dest,

 			   uint32_t length, int direction )

 {

     uint32_t control;

     if( direction == 0 ) {

 	/* DMA Disabled, IRQ disabled, 32 byte transfer, burst mode,

 	 * Memory => Device, Source addr increment, dest addr fixed

 	 */

 	control = 0x000012C0;

     } else {

 	/* DMA Disabled, IRQ disabled, 32 byte transfer, burst mode,

 	 * Device => Memory, Source addr fixed, dest addr increment

 	 */

 	control = 0x000043C0;

     }

     long_write( DMA_CHCR(channel), control );

     long_write( DMA_SAR(channel), source );

     long_write( DMA_DAR(channel), dest );

     long_write( DMA_TCR(channel), (length >> 5) );

     control |= 0x0001;

     long_write( DMA_CHCR(channel), control ); /* Enable DMA channel */

     long_write( DMA_OR, 0x8201 ); /* Ensure the DMAC config is set */

 }

 int pvr_dma_write( unsigned int target, char *buf, int len, int region )

 {

     uint32_t addr =(uint32_t)buf;

     int result;

     if( (addr & 0xFFFFFFE0) != addr ) {

 	fprintf( stderr, "Address error: Attempting DMA from %08X\n", addr );

 	return -1;

     }

     long_write( PVR_DMA_CTL, 0 ); /* Stop PVR dma if it's already running */

     asic_clear();

     dmac_prepare_channel( 2, (uint32_t)buf, 0, len, 0 ); /* Allocate channel 2 */

     long_write( PVR_DMA_DEST, target );

     long_write( PVR_DMA_COUNT, len );

     long_write( PVR_DMA_REGION, region );

     CHECK_IEQUALS( target, long_read(PVR_DMA_DEST) );

     CHECK_IEQUALS( len, long_read(PVR_DMA_COUNT) );

     CHECK_IEQUALS( 0, long_read(PVR_DMA_REGION) );

     CHECK_IEQUALS( (uint32_t)buf, long_read(DMA_SAR(2)) );

     CHECK_IEQUALS( len/32, long_read(DMA_TCR(2)) );

     CHECK_IEQUALS( 0x12C1, long_read(DMA_CHCR(2)) );

     long_write( PVR_DMA_CTL, 1 );

     result = asic_wait(EVENT_PVR_DMA);

     if( result != 0 ) {

 	fprintf( stderr, "PVR DMA failed (timeout)\n" );

 	asic_dump(stderr);

 	fprintf( stderr, "Dest: %08X  Count: %08X  Ctl: %08X\n", long_read(PVR_DMA_DEST),

 		 long_read(PVR_DMA_COUNT), long_read(PVR_DMA_CTL) );

 	dmac_dump_channel(stderr, 2);

 	long_write( PVR_DMA_CTL, 0 );

     }

     CHECK_IEQUALS( 0, long_read(PVR_DMA_CTL) );

     CHECK_IEQUALS( ((uint32_t)buf)+len, long_read(DMA_SAR(2))  );

     CHECK_IEQUALS( 0, long_read(DMA_TCR(2)) );

     CHECK_IEQUALS( 0x12C3, long_read(DMA_CHCR(2)) );

     CHECK_IEQUALS( target, long_read(PVR_DMA_DEST) );

     CHECK_IEQUALS( 0, long_read(PVR_DMA_COUNT) );

     CHECK_IEQUALS( 0, long_read(PVR_DMA_REGION) );

     return result;

 }

 int sort_dma_write( char *sorttable, int tablelen, char *data, int datalen, int bitwidth, int datasize )

 {

     int result;

     uint32_t tableaddr = (uint32_t)sorttable;

     uint32_t dataaddr = (uint32_t)data;

     long_write( SORT_DMA_CTL, 0 );

     asic_clear();

     long_write( SORT_DMA_TABLE, tableaddr );

     long_write( SORT_DMA_DATA, dataaddr );

     long_write( SORT_DMA_TABLEBITS, bitwidth );

     long_write( SORT_DMA_DATASIZE, datasize );

     long_write( SORT_DMA_CTL, 1 );

     result = asic_wait2(EVENT_SORT_DMA, EVENT_SORT_DMA_ERR);

     if( result == -1 ) {

         fprintf( stderr, "SORT DMA failed (timeout)\n" );

         asic_dump(stderr);

         fprintf( stderr, "Table: %08X Count: %08X Ctl: %08X\n", long_read(SORT_DMA_TABLE), long_read(SORT_DMA_COUNT),

                  long_read(SORT_DMA_CTL) );

         long_write( SORT_DMA_CTL, 0 );

     }

     CHECK_IEQUALS( 0, long_read(SORT_DMA_CTL) );

     return result;

 }