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Line 40... |
#include "abstract.h"
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#include "abstract.h"
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#include "fields.h"
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#include "fields.h"
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#include "sched.h"
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#include "sched.h"
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#include "debug.h"
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#include "debug.h"
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DEFAULT_DEBUG_CHANNEL(dma);
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/* We keep a copy of all our controllers because we have to export an interface
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/* We keep a copy of all our controllers because we have to export an interface
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* to other peripherals eg. ethernet */
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* to other peripherals eg. ethernet */
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static struct dma_controller *dmas = NULL;
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static struct dma_controller *dmas = NULL;
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static uint32_t dma_read32( oraddr_t addr, void *dat );
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static uint32_t dma_read32( oraddr_t addr, void *dat );
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| Line 241... |
Line 243... |
{
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{
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struct dma_channel *channel = dat;
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struct dma_channel *channel = dat;
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/* Do we need to abort? */
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/* Do we need to abort? */
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if ( TEST_FLAG( channel->regs.csr, DMA_CH_CSR, STOP ) ) {
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if ( TEST_FLAG( channel->regs.csr, DMA_CH_CSR, STOP ) ) {
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debug( 3, "DMA: STOP requested\n" );
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TRACE( "DMA: STOP requested\n" );
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CLEAR_FLAG( channel->regs.csr, DMA_CH_CSR, CH_EN );
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CLEAR_FLAG( channel->regs.csr, DMA_CH_CSR, CH_EN );
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CLEAR_FLAG( channel->regs.csr, DMA_CH_CSR, BUSY );
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CLEAR_FLAG( channel->regs.csr, DMA_CH_CSR, BUSY );
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SET_FLAG( channel->regs.csr, DMA_CH_CSR, ERR );
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SET_FLAG( channel->regs.csr, DMA_CH_CSR, ERR );
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if ( TEST_FLAG( channel->regs.csr, DMA_CH_CSR, INE_ERR ) &&
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if ( TEST_FLAG( channel->regs.csr, DMA_CH_CSR, INE_ERR ) &&
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| Line 265... |
Line 267... |
return;
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return;
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}
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}
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/* If this is the first cycle of the transfer, initialize our state */
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/* If this is the first cycle of the transfer, initialize our state */
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if ( !TEST_FLAG( channel->regs.csr, DMA_CH_CSR, BUSY ) ) {
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if ( !TEST_FLAG( channel->regs.csr, DMA_CH_CSR, BUSY ) ) {
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debug( 4, "DMA: Starting new transfer\n" );
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TRACE( "DMA: Starting new transfer\n" );
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CLEAR_FLAG( channel->regs.csr, DMA_CH_CSR, DONE );
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CLEAR_FLAG( channel->regs.csr, DMA_CH_CSR, DONE );
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CLEAR_FLAG( channel->regs.csr, DMA_CH_CSR, ERR );
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CLEAR_FLAG( channel->regs.csr, DMA_CH_CSR, ERR );
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SET_FLAG( channel->regs.csr, DMA_CH_CSR, BUSY );
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SET_FLAG( channel->regs.csr, DMA_CH_CSR, BUSY );
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Line 284... |
/* Set our internal status */
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/* Set our internal status */
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dma_init_transfer( channel );
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dma_init_transfer( channel );
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/* Might need to skip descriptor */
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/* Might need to skip descriptor */
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if ( CHANNEL_ND_I( channel ) ) {
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if ( CHANNEL_ND_I( channel ) ) {
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debug( 3, "DMA: dma_nd_i asserted before dma_req_i, skipping descriptor\n" );
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TRACE( "DMA: dma_nd_i asserted before dma_req_i, skipping descriptor\n" );
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dma_channel_terminate_transfer( channel, 0 );
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dma_channel_terminate_transfer( channel, 0 );
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return;
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return;
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}
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}
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}
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}
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| Line 302... |
Line 304... |
/* Have we finished a whole chunk? */
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/* Have we finished a whole chunk? */
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channel->dma_ack_o = (channel->words_transferred % channel->chunk_size == 0);
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channel->dma_ack_o = (channel->words_transferred % channel->chunk_size == 0);
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/* When done with a chunk, check for dma_nd_i */
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/* When done with a chunk, check for dma_nd_i */
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if ( CHANNEL_ND_I( channel ) ) {
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if ( CHANNEL_ND_I( channel ) ) {
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debug( 3, "DMA: dma_nd_i asserted\n" );
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TRACE( "DMA: dma_nd_i asserted\n" );
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dma_channel_terminate_transfer( channel, 0 );
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dma_channel_terminate_transfer( channel, 0 );
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return;
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return;
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}
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}
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/* Are we done? */
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/* Are we done? */
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| Line 358... |
Line 360... |
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/* Take care of transfer termination */
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/* Take care of transfer termination */
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void dma_channel_terminate_transfer( struct dma_channel *channel, int generate_interrupt )
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void dma_channel_terminate_transfer( struct dma_channel *channel, int generate_interrupt )
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{
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{
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debug( 4, "DMA: Terminating transfer\n" );
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TRACE( "DMA: Terminating transfer\n" );
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/* Might be working in a linked list */
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/* Might be working in a linked list */
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if ( channel->load_next_descriptor_when_done ) {
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if ( channel->load_next_descriptor_when_done ) {
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dma_load_descriptor( channel );
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dma_load_descriptor( channel );
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dma_init_transfer( channel );
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dma_init_transfer( channel );
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