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236 lines
6.3 KiB
236 lines
6.3 KiB
// SPDX-License-Identifier: GPL-2.0-or-later |
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/* |
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* Routines for GF1 DMA control |
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* Copyright (c) by Jaroslav Kysela <[email protected]> |
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*/ |
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#include <asm/dma.h> |
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#include <linux/slab.h> |
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#include <sound/core.h> |
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#include <sound/gus.h> |
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static void snd_gf1_dma_ack(struct snd_gus_card * gus) |
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{ |
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unsigned long flags; |
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spin_lock_irqsave(&gus->reg_lock, flags); |
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snd_gf1_write8(gus, SNDRV_GF1_GB_DRAM_DMA_CONTROL, 0x00); |
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snd_gf1_look8(gus, SNDRV_GF1_GB_DRAM_DMA_CONTROL); |
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spin_unlock_irqrestore(&gus->reg_lock, flags); |
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} |
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static void snd_gf1_dma_program(struct snd_gus_card * gus, |
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unsigned int addr, |
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unsigned long buf_addr, |
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unsigned int count, |
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unsigned int cmd) |
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{ |
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unsigned long flags; |
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unsigned int address; |
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unsigned char dma_cmd; |
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unsigned int address_high; |
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snd_printdd("dma_transfer: addr=0x%x, buf=0x%lx, count=0x%x\n", |
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addr, buf_addr, count); |
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if (gus->gf1.dma1 > 3) { |
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if (gus->gf1.enh_mode) { |
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address = addr >> 1; |
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} else { |
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if (addr & 0x1f) { |
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snd_printd("snd_gf1_dma_transfer: unaligned address (0x%x)?\n", addr); |
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return; |
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} |
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address = (addr & 0x000c0000) | ((addr & 0x0003ffff) >> 1); |
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} |
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} else { |
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address = addr; |
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} |
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dma_cmd = SNDRV_GF1_DMA_ENABLE | (unsigned short) cmd; |
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#if 0 |
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dma_cmd |= 0x08; |
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#endif |
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if (dma_cmd & SNDRV_GF1_DMA_16BIT) { |
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count++; |
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count &= ~1; /* align */ |
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} |
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if (gus->gf1.dma1 > 3) { |
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dma_cmd |= SNDRV_GF1_DMA_WIDTH16; |
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count++; |
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count &= ~1; /* align */ |
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} |
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snd_gf1_dma_ack(gus); |
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snd_dma_program(gus->gf1.dma1, buf_addr, count, dma_cmd & SNDRV_GF1_DMA_READ ? DMA_MODE_READ : DMA_MODE_WRITE); |
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#if 0 |
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snd_printk(KERN_DEBUG "address = 0x%x, count = 0x%x, dma_cmd = 0x%x\n", |
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address << 1, count, dma_cmd); |
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#endif |
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spin_lock_irqsave(&gus->reg_lock, flags); |
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if (gus->gf1.enh_mode) { |
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address_high = ((address >> 16) & 0x000000f0) | (address & 0x0000000f); |
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snd_gf1_write16(gus, SNDRV_GF1_GW_DRAM_DMA_LOW, (unsigned short) (address >> 4)); |
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snd_gf1_write8(gus, SNDRV_GF1_GB_DRAM_DMA_HIGH, (unsigned char) address_high); |
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} else |
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snd_gf1_write16(gus, SNDRV_GF1_GW_DRAM_DMA_LOW, (unsigned short) (address >> 4)); |
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snd_gf1_write8(gus, SNDRV_GF1_GB_DRAM_DMA_CONTROL, dma_cmd); |
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spin_unlock_irqrestore(&gus->reg_lock, flags); |
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} |
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static struct snd_gf1_dma_block *snd_gf1_dma_next_block(struct snd_gus_card * gus) |
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{ |
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struct snd_gf1_dma_block *block; |
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/* PCM block have bigger priority than synthesizer one */ |
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if (gus->gf1.dma_data_pcm) { |
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block = gus->gf1.dma_data_pcm; |
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if (gus->gf1.dma_data_pcm_last == block) { |
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gus->gf1.dma_data_pcm = |
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gus->gf1.dma_data_pcm_last = NULL; |
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} else { |
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gus->gf1.dma_data_pcm = block->next; |
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} |
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} else if (gus->gf1.dma_data_synth) { |
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block = gus->gf1.dma_data_synth; |
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if (gus->gf1.dma_data_synth_last == block) { |
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gus->gf1.dma_data_synth = |
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gus->gf1.dma_data_synth_last = NULL; |
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} else { |
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gus->gf1.dma_data_synth = block->next; |
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} |
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} else { |
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block = NULL; |
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} |
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if (block) { |
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gus->gf1.dma_ack = block->ack; |
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gus->gf1.dma_private_data = block->private_data; |
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} |
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return block; |
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} |
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static void snd_gf1_dma_interrupt(struct snd_gus_card * gus) |
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{ |
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struct snd_gf1_dma_block *block; |
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snd_gf1_dma_ack(gus); |
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if (gus->gf1.dma_ack) |
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gus->gf1.dma_ack(gus, gus->gf1.dma_private_data); |
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spin_lock(&gus->dma_lock); |
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if (gus->gf1.dma_data_pcm == NULL && |
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gus->gf1.dma_data_synth == NULL) { |
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gus->gf1.dma_ack = NULL; |
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gus->gf1.dma_flags &= ~SNDRV_GF1_DMA_TRIGGER; |
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spin_unlock(&gus->dma_lock); |
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return; |
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} |
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block = snd_gf1_dma_next_block(gus); |
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spin_unlock(&gus->dma_lock); |
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if (!block) |
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return; |
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snd_gf1_dma_program(gus, block->addr, block->buf_addr, block->count, (unsigned short) block->cmd); |
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kfree(block); |
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#if 0 |
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snd_printd(KERN_DEBUG "program dma (IRQ) - " |
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"addr = 0x%x, buffer = 0x%lx, count = 0x%x, cmd = 0x%x\n", |
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block->addr, block->buf_addr, block->count, block->cmd); |
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#endif |
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} |
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int snd_gf1_dma_init(struct snd_gus_card * gus) |
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{ |
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mutex_lock(&gus->dma_mutex); |
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gus->gf1.dma_shared++; |
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if (gus->gf1.dma_shared > 1) { |
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mutex_unlock(&gus->dma_mutex); |
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return 0; |
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} |
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gus->gf1.interrupt_handler_dma_write = snd_gf1_dma_interrupt; |
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gus->gf1.dma_data_pcm = |
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gus->gf1.dma_data_pcm_last = |
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gus->gf1.dma_data_synth = |
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gus->gf1.dma_data_synth_last = NULL; |
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mutex_unlock(&gus->dma_mutex); |
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return 0; |
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} |
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int snd_gf1_dma_done(struct snd_gus_card * gus) |
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{ |
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struct snd_gf1_dma_block *block; |
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mutex_lock(&gus->dma_mutex); |
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gus->gf1.dma_shared--; |
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if (!gus->gf1.dma_shared) { |
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snd_dma_disable(gus->gf1.dma1); |
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snd_gf1_set_default_handlers(gus, SNDRV_GF1_HANDLER_DMA_WRITE); |
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snd_gf1_dma_ack(gus); |
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while ((block = gus->gf1.dma_data_pcm)) { |
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gus->gf1.dma_data_pcm = block->next; |
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kfree(block); |
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} |
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while ((block = gus->gf1.dma_data_synth)) { |
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gus->gf1.dma_data_synth = block->next; |
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kfree(block); |
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} |
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gus->gf1.dma_data_pcm_last = |
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gus->gf1.dma_data_synth_last = NULL; |
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} |
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mutex_unlock(&gus->dma_mutex); |
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return 0; |
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} |
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int snd_gf1_dma_transfer_block(struct snd_gus_card * gus, |
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struct snd_gf1_dma_block * __block, |
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int atomic, |
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int synth) |
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{ |
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unsigned long flags; |
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struct snd_gf1_dma_block *block; |
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block = kmalloc(sizeof(*block), atomic ? GFP_ATOMIC : GFP_KERNEL); |
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if (!block) |
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return -ENOMEM; |
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*block = *__block; |
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block->next = NULL; |
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snd_printdd("addr = 0x%x, buffer = 0x%lx, count = 0x%x, cmd = 0x%x\n", |
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block->addr, (long) block->buffer, block->count, |
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block->cmd); |
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snd_printdd("gus->gf1.dma_data_pcm_last = 0x%lx\n", |
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(long)gus->gf1.dma_data_pcm_last); |
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snd_printdd("gus->gf1.dma_data_pcm = 0x%lx\n", |
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(long)gus->gf1.dma_data_pcm); |
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spin_lock_irqsave(&gus->dma_lock, flags); |
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if (synth) { |
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if (gus->gf1.dma_data_synth_last) { |
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gus->gf1.dma_data_synth_last->next = block; |
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gus->gf1.dma_data_synth_last = block; |
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} else { |
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gus->gf1.dma_data_synth = |
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gus->gf1.dma_data_synth_last = block; |
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} |
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} else { |
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if (gus->gf1.dma_data_pcm_last) { |
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gus->gf1.dma_data_pcm_last->next = block; |
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gus->gf1.dma_data_pcm_last = block; |
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} else { |
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gus->gf1.dma_data_pcm = |
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gus->gf1.dma_data_pcm_last = block; |
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} |
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} |
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if (!(gus->gf1.dma_flags & SNDRV_GF1_DMA_TRIGGER)) { |
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gus->gf1.dma_flags |= SNDRV_GF1_DMA_TRIGGER; |
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block = snd_gf1_dma_next_block(gus); |
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spin_unlock_irqrestore(&gus->dma_lock, flags); |
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if (block == NULL) |
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return 0; |
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snd_gf1_dma_program(gus, block->addr, block->buf_addr, block->count, (unsigned short) block->cmd); |
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kfree(block); |
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return 0; |
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} |
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spin_unlock_irqrestore(&gus->dma_lock, flags); |
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return 0; |
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}
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