diff options
author | Linus Torvalds <torvalds@ppc970.osdl.org> | 2005-04-17 02:20:36 +0400 |
---|---|---|
committer | Linus Torvalds <torvalds@ppc970.osdl.org> | 2005-04-17 02:20:36 +0400 |
commit | 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 (patch) | |
tree | 0bba044c4ce775e45a88a51686b5d9f90697ea9d /sound/isa/gus/gus_dma.c | |
download | linux-1da177e4c3f41524e886b7f1b8a0c1fc7321cac2.tar.xz |
Linux-2.6.12-rc2
Initial git repository build. I'm not bothering with the full history,
even though we have it. We can create a separate "historical" git
archive of that later if we want to, and in the meantime it's about
3.2GB when imported into git - space that would just make the early
git days unnecessarily complicated, when we don't have a lot of good
infrastructure for it.
Let it rip!
Diffstat (limited to 'sound/isa/gus/gus_dma.c')
-rw-r--r-- | sound/isa/gus/gus_dma.c | 244 |
1 files changed, 244 insertions, 0 deletions
diff --git a/sound/isa/gus/gus_dma.c b/sound/isa/gus/gus_dma.c new file mode 100644 index 000000000000..de4b56d80b35 --- /dev/null +++ b/sound/isa/gus/gus_dma.c @@ -0,0 +1,244 @@ +/* + * Routines for GF1 DMA control + * Copyright (c) by Jaroslav Kysela <perex@suse.cz> + * + * + * 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., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA + * + */ + +#include <sound/driver.h> +#include <asm/dma.h> +#include <linux/slab.h> +#include <sound/core.h> +#include <sound/gus.h> + +static void snd_gf1_dma_ack(snd_gus_card_t * gus) +{ + unsigned long flags; + + spin_lock_irqsave(&gus->reg_lock, flags); + snd_gf1_write8(gus, SNDRV_GF1_GB_DRAM_DMA_CONTROL, 0x00); + snd_gf1_look8(gus, SNDRV_GF1_GB_DRAM_DMA_CONTROL); + spin_unlock_irqrestore(&gus->reg_lock, flags); +} + +static void snd_gf1_dma_program(snd_gus_card_t * gus, + unsigned int addr, + unsigned long buf_addr, + unsigned int count, + unsigned int cmd) +{ + unsigned long flags; + unsigned int address; + unsigned char dma_cmd; + unsigned int address_high; + + // snd_printk("dma_transfer: addr=0x%x, buf=0x%lx, count=0x%x\n", addr, (long) buf, count); + + if (gus->gf1.dma1 > 3) { + if (gus->gf1.enh_mode) { + address = addr >> 1; + } else { + if (addr & 0x1f) { + snd_printd("snd_gf1_dma_transfer: unaligned address (0x%x)?\n", addr); + return; + } + address = (addr & 0x000c0000) | ((addr & 0x0003ffff) >> 1); + } + } else { + address = addr; + } + + dma_cmd = SNDRV_GF1_DMA_ENABLE | (unsigned short) cmd; +#if 0 + dma_cmd |= 0x08; +#endif + if (dma_cmd & SNDRV_GF1_DMA_16BIT) { + count++; + count &= ~1; /* align */ + } + if (gus->gf1.dma1 > 3) { + dma_cmd |= SNDRV_GF1_DMA_WIDTH16; + count++; + count &= ~1; /* align */ + } + snd_gf1_dma_ack(gus); + snd_dma_program(gus->gf1.dma1, buf_addr, count, dma_cmd & SNDRV_GF1_DMA_READ ? DMA_MODE_READ : DMA_MODE_WRITE); +#if 0 + snd_printk("address = 0x%x, count = 0x%x, dma_cmd = 0x%x\n", address << 1, count, dma_cmd); +#endif + spin_lock_irqsave(&gus->reg_lock, flags); + if (gus->gf1.enh_mode) { + address_high = ((address >> 16) & 0x000000f0) | (address & 0x0000000f); + snd_gf1_write16(gus, SNDRV_GF1_GW_DRAM_DMA_LOW, (unsigned short) (address >> 4)); + snd_gf1_write8(gus, SNDRV_GF1_GB_DRAM_DMA_HIGH, (unsigned char) address_high); + } else + snd_gf1_write16(gus, SNDRV_GF1_GW_DRAM_DMA_LOW, (unsigned short) (address >> 4)); + snd_gf1_write8(gus, SNDRV_GF1_GB_DRAM_DMA_CONTROL, dma_cmd); + spin_unlock_irqrestore(&gus->reg_lock, flags); +} + +static snd_gf1_dma_block_t *snd_gf1_dma_next_block(snd_gus_card_t * gus) +{ + snd_gf1_dma_block_t *block; + + /* PCM block have bigger priority than synthesizer one */ + if (gus->gf1.dma_data_pcm) { + block = gus->gf1.dma_data_pcm; + if (gus->gf1.dma_data_pcm_last == block) { + gus->gf1.dma_data_pcm = + gus->gf1.dma_data_pcm_last = NULL; + } else { + gus->gf1.dma_data_pcm = block->next; + } + } else if (gus->gf1.dma_data_synth) { + block = gus->gf1.dma_data_synth; + if (gus->gf1.dma_data_synth_last == block) { + gus->gf1.dma_data_synth = + gus->gf1.dma_data_synth_last = NULL; + } else { + gus->gf1.dma_data_synth = block->next; + } + } else { + block = NULL; + } + if (block) { + gus->gf1.dma_ack = block->ack; + gus->gf1.dma_private_data = block->private_data; + } + return block; +} + + +static void snd_gf1_dma_interrupt(snd_gus_card_t * gus) +{ + snd_gf1_dma_block_t *block; + + snd_gf1_dma_ack(gus); + if (gus->gf1.dma_ack) + gus->gf1.dma_ack(gus, gus->gf1.dma_private_data); + spin_lock(&gus->dma_lock); + if (gus->gf1.dma_data_pcm == NULL && + gus->gf1.dma_data_synth == NULL) { + gus->gf1.dma_ack = NULL; + gus->gf1.dma_flags &= ~SNDRV_GF1_DMA_TRIGGER; + spin_unlock(&gus->dma_lock); + return; + } + block = snd_gf1_dma_next_block(gus); + spin_unlock(&gus->dma_lock); + snd_gf1_dma_program(gus, block->addr, block->buf_addr, block->count, (unsigned short) block->cmd); + kfree(block); +#if 0 + printk("program dma (IRQ) - addr = 0x%x, buffer = 0x%lx, count = 0x%x, cmd = 0x%x\n", addr, (long) buffer, count, cmd); +#endif +} + +int snd_gf1_dma_init(snd_gus_card_t * gus) +{ + down(&gus->dma_mutex); + gus->gf1.dma_shared++; + if (gus->gf1.dma_shared > 1) { + up(&gus->dma_mutex); + return 0; + } + gus->gf1.interrupt_handler_dma_write = snd_gf1_dma_interrupt; + gus->gf1.dma_data_pcm = + gus->gf1.dma_data_pcm_last = + gus->gf1.dma_data_synth = + gus->gf1.dma_data_synth_last = NULL; + up(&gus->dma_mutex); + return 0; +} + +int snd_gf1_dma_done(snd_gus_card_t * gus) +{ + snd_gf1_dma_block_t *block; + + down(&gus->dma_mutex); + gus->gf1.dma_shared--; + if (!gus->gf1.dma_shared) { + snd_dma_disable(gus->gf1.dma1); + snd_gf1_set_default_handlers(gus, SNDRV_GF1_HANDLER_DMA_WRITE); + snd_gf1_dma_ack(gus); + while ((block = gus->gf1.dma_data_pcm)) { + gus->gf1.dma_data_pcm = block->next; + kfree(block); + } + while ((block = gus->gf1.dma_data_synth)) { + gus->gf1.dma_data_synth = block->next; + kfree(block); + } + gus->gf1.dma_data_pcm_last = + gus->gf1.dma_data_synth_last = NULL; + } + up(&gus->dma_mutex); + return 0; +} + +int snd_gf1_dma_transfer_block(snd_gus_card_t * gus, + snd_gf1_dma_block_t * __block, + int atomic, + int synth) +{ + unsigned long flags; + snd_gf1_dma_block_t *block; + + block = kmalloc(sizeof(*block), atomic ? GFP_ATOMIC : GFP_KERNEL); + if (block == NULL) { + snd_printk("gf1: DMA transfer failure; not enough memory\n"); + return -ENOMEM; + } + *block = *__block; + block->next = NULL; +#if 0 + printk("addr = 0x%x, buffer = 0x%lx, count = 0x%x, cmd = 0x%x\n", block->addr, (long) block->buffer, block->count, block->cmd); +#endif +#if 0 + printk("gus->gf1.dma_data_pcm_last = 0x%lx\n", (long)gus->gf1.dma_data_pcm_last); + printk("gus->gf1.dma_data_pcm = 0x%lx\n", (long)gus->gf1.dma_data_pcm); +#endif + spin_lock_irqsave(&gus->dma_lock, flags); + if (synth) { + if (gus->gf1.dma_data_synth_last) { + gus->gf1.dma_data_synth_last->next = block; + gus->gf1.dma_data_synth_last = block; + } else { + gus->gf1.dma_data_synth = + gus->gf1.dma_data_synth_last = block; + } + } else { + if (gus->gf1.dma_data_pcm_last) { + gus->gf1.dma_data_pcm_last->next = block; + gus->gf1.dma_data_pcm_last = block; + } else { + gus->gf1.dma_data_pcm = + gus->gf1.dma_data_pcm_last = block; + } + } + if (!(gus->gf1.dma_flags & SNDRV_GF1_DMA_TRIGGER)) { + gus->gf1.dma_flags |= SNDRV_GF1_DMA_TRIGGER; + block = snd_gf1_dma_next_block(gus); + spin_unlock_irqrestore(&gus->dma_lock, flags); + if (block == NULL) + return 0; + snd_gf1_dma_program(gus, block->addr, block->buf_addr, block->count, (unsigned short) block->cmd); + kfree(block); + return 0; + } + spin_unlock_irqrestore(&gus->dma_lock, flags); + return 0; +} |