git.oblomov.eu Git - linux-2.6/blob - sound/isa/gus/gus_dma.c

   1 /*
   2  *  Routines for GF1 DMA control
   3  *  Copyright (c) by Jaroslav Kysela <perex@perex.cz>
   4  *
   5  *
   6  *   This program is free software; you can redistribute it and/or modify
   7  *   it under the terms of the GNU General Public License as published by
   8  *   the Free Software Foundation; either version 2 of the License, or
   9  *   (at your option) any later version.
  10  *
  11  *   This program is distributed in the hope that it will be useful,
  12  *   but WITHOUT ANY WARRANTY; without even the implied warranty of
  13  *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14  *   GNU General Public License for more details.
  15  *
  16  *   You should have received a copy of the GNU General Public License
  17  *   along with this program; if not, write to the Free Software
  18  *   Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307 USA
  19  *
  20  */
  21
  22 #include <asm/dma.h>
  23 #include <linux/slab.h>
  24 #include <sound/core.h>
  25 #include <sound/gus.h>
  26
  27 static void snd_gf1_dma_ack(struct snd_gus_card * gus)
  28 {
  29         unsigned long flags;
  30
  31         spin_lock_irqsave(&gus->reg_lock, flags);
  32         snd_gf1_write8(gus, SNDRV_GF1_GB_DRAM_DMA_CONTROL, 0x00);
  33         snd_gf1_look8(gus, SNDRV_GF1_GB_DRAM_DMA_CONTROL);
  34         spin_unlock_irqrestore(&gus->reg_lock, flags);
  35 }
  36
  37 static void snd_gf1_dma_program(struct snd_gus_card * gus,
  38                                 unsigned int addr,
  39                                 unsigned long buf_addr,
  40                                 unsigned int count,
  41                                 unsigned int cmd)
  42 {
  43         unsigned long flags;
  44         unsigned int address;
  45         unsigned char dma_cmd;
  46         unsigned int address_high;
  47
  48         // snd_printk("dma_transfer: addr=0x%x, buf=0x%lx, count=0x%x\n", addr, (long) buf, count);
  49
  50         if (gus->gf1.dma1 > 3) {
  51                 if (gus->gf1.enh_mode) {
  52                         address = addr >> 1;
  53                 } else {
  54                         if (addr & 0x1f) {
  55                                 snd_printd("snd_gf1_dma_transfer: unaligned address (0x%x)?\n", addr);
  56                                 return;
  57                         }
  58                         address = (addr & 0x000c0000) | ((addr & 0x0003ffff) >> 1);
  59                 }
  60         } else {
  61                 address = addr;
  62         }
  63
  64         dma_cmd = SNDRV_GF1_DMA_ENABLE | (unsigned short) cmd;
  65 #if 0
  66         dma_cmd |= 0x08;
  67 #endif
  68         if (dma_cmd & SNDRV_GF1_DMA_16BIT) {
  69                 count++;
  70                 count &= ~1;    /* align */
  71         }
  72         if (gus->gf1.dma1 > 3) {
  73                 dma_cmd |= SNDRV_GF1_DMA_WIDTH16;
  74                 count++;
  75                 count &= ~1;    /* align */
  76         }
  77         snd_gf1_dma_ack(gus);
  78         snd_dma_program(gus->gf1.dma1, buf_addr, count, dma_cmd & SNDRV_GF1_DMA_READ ? DMA_MODE_READ : DMA_MODE_WRITE);
  79 #if 0
  80         snd_printk("address = 0x%x, count = 0x%x, dma_cmd = 0x%x\n", address << 1, count, dma_cmd);
  81 #endif
  82         spin_lock_irqsave(&gus->reg_lock, flags);
  83         if (gus->gf1.enh_mode) {
  84                 address_high = ((address >> 16) & 0x000000f0) | (address & 0x0000000f);
  85                 snd_gf1_write16(gus, SNDRV_GF1_GW_DRAM_DMA_LOW, (unsigned short) (address >> 4));
  86                 snd_gf1_write8(gus, SNDRV_GF1_GB_DRAM_DMA_HIGH, (unsigned char) address_high);
  87         } else
  88                 snd_gf1_write16(gus, SNDRV_GF1_GW_DRAM_DMA_LOW, (unsigned short) (address >> 4));
  89         snd_gf1_write8(gus, SNDRV_GF1_GB_DRAM_DMA_CONTROL, dma_cmd);
  90         spin_unlock_irqrestore(&gus->reg_lock, flags);
  91 }
  92
  93 static struct snd_gf1_dma_block *snd_gf1_dma_next_block(struct snd_gus_card * gus)
  94 {
  95         struct snd_gf1_dma_block *block;
  96
  97         /* PCM block have bigger priority than synthesizer one */
  98         if (gus->gf1.dma_data_pcm) {
  99                 block = gus->gf1.dma_data_pcm;
 100                 if (gus->gf1.dma_data_pcm_last == block) {
 101                         gus->gf1.dma_data_pcm =
 102                         gus->gf1.dma_data_pcm_last = NULL;
 103                 } else {
 104                         gus->gf1.dma_data_pcm = block->next;
 105                 }
 106         } else if (gus->gf1.dma_data_synth) {
 107                 block = gus->gf1.dma_data_synth;
 108                 if (gus->gf1.dma_data_synth_last == block) {
 109                         gus->gf1.dma_data_synth =
 110                         gus->gf1.dma_data_synth_last = NULL;
 111                 } else {
 112                         gus->gf1.dma_data_synth = block->next;
 113                 }
 114         } else {
 115                 block = NULL;
 116         }
 117         if (block) {
 118                 gus->gf1.dma_ack = block->ack;
 119                 gus->gf1.dma_private_data = block->private_data;
 120         }
 121         return block;
 122 }
 123
 124
 125 static void snd_gf1_dma_interrupt(struct snd_gus_card * gus)
 126 {
 127         struct snd_gf1_dma_block *block;
 128
 129         snd_gf1_dma_ack(gus);
 130         if (gus->gf1.dma_ack)
 131                 gus->gf1.dma_ack(gus, gus->gf1.dma_private_data);
 132         spin_lock(&gus->dma_lock);
 133         if (gus->gf1.dma_data_pcm == NULL &&
 134             gus->gf1.dma_data_synth == NULL) {
 135                 gus->gf1.dma_ack = NULL;
 136                 gus->gf1.dma_flags &= ~SNDRV_GF1_DMA_TRIGGER;
 137                 spin_unlock(&gus->dma_lock);
 138                 return;
 139         }
 140         block = snd_gf1_dma_next_block(gus);
 141         spin_unlock(&gus->dma_lock);
 142         snd_gf1_dma_program(gus, block->addr, block->buf_addr, block->count, (unsigned short) block->cmd);
 143         kfree(block);
 144 #if 0
 145         printk("program dma (IRQ) - addr = 0x%x, buffer = 0x%lx, count = 0x%x, cmd = 0x%x\n", addr, (long) buffer, count, cmd);
 146 #endif
 147 }
 148
 149 int snd_gf1_dma_init(struct snd_gus_card * gus)
 150 {
 151         mutex_lock(&gus->dma_mutex);
 152         gus->gf1.dma_shared++;
 153         if (gus->gf1.dma_shared > 1) {
 154                 mutex_unlock(&gus->dma_mutex);
 155                 return 0;
 156         }
 157         gus->gf1.interrupt_handler_dma_write = snd_gf1_dma_interrupt;
 158         gus->gf1.dma_data_pcm =
 159         gus->gf1.dma_data_pcm_last =
 160         gus->gf1.dma_data_synth =
 161         gus->gf1.dma_data_synth_last = NULL;
 162         mutex_unlock(&gus->dma_mutex);
 163         return 0;
 164 }
 165
 166 int snd_gf1_dma_done(struct snd_gus_card * gus)
 167 {
 168         struct snd_gf1_dma_block *block;
 169
 170         mutex_lock(&gus->dma_mutex);
 171         gus->gf1.dma_shared--;
 172         if (!gus->gf1.dma_shared) {
 173                 snd_dma_disable(gus->gf1.dma1);
 174                 snd_gf1_set_default_handlers(gus, SNDRV_GF1_HANDLER_DMA_WRITE);
 175                 snd_gf1_dma_ack(gus);
 176                 while ((block = gus->gf1.dma_data_pcm)) {
 177                         gus->gf1.dma_data_pcm = block->next;
 178                         kfree(block);
 179                 }
 180                 while ((block = gus->gf1.dma_data_synth)) {
 181                         gus->gf1.dma_data_synth = block->next;
 182                         kfree(block);
 183                 }
 184                 gus->gf1.dma_data_pcm_last =
 185                 gus->gf1.dma_data_synth_last = NULL;
 186         }
 187         mutex_unlock(&gus->dma_mutex);
 188         return 0;
 189 }
 190
 191 int snd_gf1_dma_transfer_block(struct snd_gus_card * gus,
 192                                struct snd_gf1_dma_block * __block,
 193                                int atomic,
 194                                int synth)
 195 {
 196         unsigned long flags;
 197         struct snd_gf1_dma_block *block;
 198
 199         block = kmalloc(sizeof(*block), atomic ? GFP_ATOMIC : GFP_KERNEL);
 200         if (block == NULL) {
 201                 snd_printk(KERN_ERR "gf1: DMA transfer failure; not enough memory\n");
 202                 return -ENOMEM;
 203         }
 204         *block = *__block;
 205         block->next = NULL;
 206 #if 0
 207         printk("addr = 0x%x, buffer = 0x%lx, count = 0x%x, cmd = 0x%x\n", block->addr, (long) block->buffer, block->count, block->cmd);
 208 #endif
 209 #if 0
 210         printk("gus->gf1.dma_data_pcm_last = 0x%lx\n", (long)gus->gf1.dma_data_pcm_last);
 211         printk("gus->gf1.dma_data_pcm = 0x%lx\n", (long)gus->gf1.dma_data_pcm);
 212 #endif
 213         spin_lock_irqsave(&gus->dma_lock, flags);
 214         if (synth) {
 215                 if (gus->gf1.dma_data_synth_last) {
 216                         gus->gf1.dma_data_synth_last->next = block;
 217                         gus->gf1.dma_data_synth_last = block;
 218                 } else {
 219                         gus->gf1.dma_data_synth =
 220                         gus->gf1.dma_data_synth_last = block;
 221                 }
 222         } else {
 223                 if (gus->gf1.dma_data_pcm_last) {
 224                         gus->gf1.dma_data_pcm_last->next = block;
 225                         gus->gf1.dma_data_pcm_last = block;
 226                 } else {
 227                         gus->gf1.dma_data_pcm =
 228                         gus->gf1.dma_data_pcm_last = block;
 229                 }
 230         }
 231         if (!(gus->gf1.dma_flags & SNDRV_GF1_DMA_TRIGGER)) {
 232                 gus->gf1.dma_flags |= SNDRV_GF1_DMA_TRIGGER;
 233                 block = snd_gf1_dma_next_block(gus);
 234                 spin_unlock_irqrestore(&gus->dma_lock, flags);
 235                 if (block == NULL)
 236                         return 0;
 237                 snd_gf1_dma_program(gus, block->addr, block->buf_addr, block->count, (unsigned short) block->cmd);
 238                 kfree(block);
 239                 return 0;
 240         }
 241         spin_unlock_irqrestore(&gus->dma_lock, flags);
 242         return 0;
 243 }