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_printdd("dma_transfer: addr=0x%x, buf=0x%lx, count=0x%x\n",
  49                     addr, buf_addr, count);
  50
  51         if (gus->gf1.dma1 > 3) {
  52                 if (gus->gf1.enh_mode) {
  53                         address = addr >> 1;
  54                 } else {
  55                         if (addr & 0x1f) {
  56                                 snd_printd("snd_gf1_dma_transfer: unaligned address (0x%x)?\n", addr);
  57                                 return;
  58                         }
  59                         address = (addr & 0x000c0000) | ((addr & 0x0003ffff) >> 1);
  60                 }
  61         } else {
  62                 address = addr;
  63         }
  64
  65         dma_cmd = SNDRV_GF1_DMA_ENABLE | (unsigned short) cmd;
  66 #if 0
  67         dma_cmd |= 0x08;
  68 #endif
  69         if (dma_cmd & SNDRV_GF1_DMA_16BIT) {
  70                 count++;
  71                 count &= ~1;    /* align */
  72         }
  73         if (gus->gf1.dma1 > 3) {
  74                 dma_cmd |= SNDRV_GF1_DMA_WIDTH16;
  75                 count++;
  76                 count &= ~1;    /* align */
  77         }
  78         snd_gf1_dma_ack(gus);
  79         snd_dma_program(gus->gf1.dma1, buf_addr, count, dma_cmd & SNDRV_GF1_DMA_READ ? DMA_MODE_READ : DMA_MODE_WRITE);
  80 #if 0
  81         snd_printk(KERN_DEBUG "address = 0x%x, count = 0x%x, dma_cmd = 0x%x\n",
  82                    address << 1, count, dma_cmd);
  83 #endif
  84         spin_lock_irqsave(&gus->reg_lock, flags);
  85         if (gus->gf1.enh_mode) {
  86                 address_high = ((address >> 16) & 0x000000f0) | (address & 0x0000000f);
  87                 snd_gf1_write16(gus, SNDRV_GF1_GW_DRAM_DMA_LOW, (unsigned short) (address >> 4));
  88                 snd_gf1_write8(gus, SNDRV_GF1_GB_DRAM_DMA_HIGH, (unsigned char) address_high);
  89         } else
  90                 snd_gf1_write16(gus, SNDRV_GF1_GW_DRAM_DMA_LOW, (unsigned short) (address >> 4));
  91         snd_gf1_write8(gus, SNDRV_GF1_GB_DRAM_DMA_CONTROL, dma_cmd);
  92         spin_unlock_irqrestore(&gus->reg_lock, flags);
  93 }
  94
  95 static struct snd_gf1_dma_block *snd_gf1_dma_next_block(struct snd_gus_card * gus)
  96 {
  97         struct snd_gf1_dma_block *block;
  98
  99         /* PCM block have bigger priority than synthesizer one */
 100         if (gus->gf1.dma_data_pcm) {
 101                 block = gus->gf1.dma_data_pcm;
 102                 if (gus->gf1.dma_data_pcm_last == block) {
 103                         gus->gf1.dma_data_pcm =
 104                         gus->gf1.dma_data_pcm_last = NULL;
 105                 } else {
 106                         gus->gf1.dma_data_pcm = block->next;
 107                 }
 108         } else if (gus->gf1.dma_data_synth) {
 109                 block = gus->gf1.dma_data_synth;
 110                 if (gus->gf1.dma_data_synth_last == block) {
 111                         gus->gf1.dma_data_synth =
 112                         gus->gf1.dma_data_synth_last = NULL;
 113                 } else {
 114                         gus->gf1.dma_data_synth = block->next;
 115                 }
 116         } else {
 117                 block = NULL;
 118         }
 119         if (block) {
 120                 gus->gf1.dma_ack = block->ack;
 121                 gus->gf1.dma_private_data = block->private_data;
 122         }
 123         return block;
 124 }
 125
 126
 127 static void snd_gf1_dma_interrupt(struct snd_gus_card * gus)
 128 {
 129         struct snd_gf1_dma_block *block;
 130
 131         snd_gf1_dma_ack(gus);
 132         if (gus->gf1.dma_ack)
 133                 gus->gf1.dma_ack(gus, gus->gf1.dma_private_data);
 134         spin_lock(&gus->dma_lock);
 135         if (gus->gf1.dma_data_pcm == NULL &&
 136             gus->gf1.dma_data_synth == NULL) {
 137                 gus->gf1.dma_ack = NULL;
 138                 gus->gf1.dma_flags &= ~SNDRV_GF1_DMA_TRIGGER;
 139                 spin_unlock(&gus->dma_lock);
 140                 return;
 141         }
 142         block = snd_gf1_dma_next_block(gus);
 143         spin_unlock(&gus->dma_lock);
 144         snd_gf1_dma_program(gus, block->addr, block->buf_addr, block->count, (unsigned short) block->cmd);
 145         kfree(block);
 146 #if 0
 147         snd_printd(KERN_DEBUG "program dma (IRQ) - "
 148                    "addr = 0x%x, buffer = 0x%lx, count = 0x%x, cmd = 0x%x\n",
 149                    block->addr, block->buf_addr, block->count, block->cmd);
 150 #endif
 151 }
 152
 153 int snd_gf1_dma_init(struct snd_gus_card * gus)
 154 {
 155         mutex_lock(&gus->dma_mutex);
 156         gus->gf1.dma_shared++;
 157         if (gus->gf1.dma_shared > 1) {
 158                 mutex_unlock(&gus->dma_mutex);
 159                 return 0;
 160         }
 161         gus->gf1.interrupt_handler_dma_write = snd_gf1_dma_interrupt;
 162         gus->gf1.dma_data_pcm =
 163         gus->gf1.dma_data_pcm_last =
 164         gus->gf1.dma_data_synth =
 165         gus->gf1.dma_data_synth_last = NULL;
 166         mutex_unlock(&gus->dma_mutex);
 167         return 0;
 168 }
 169
 170 int snd_gf1_dma_done(struct snd_gus_card * gus)
 171 {
 172         struct snd_gf1_dma_block *block;
 173
 174         mutex_lock(&gus->dma_mutex);
 175         gus->gf1.dma_shared--;
 176         if (!gus->gf1.dma_shared) {
 177                 snd_dma_disable(gus->gf1.dma1);
 178                 snd_gf1_set_default_handlers(gus, SNDRV_GF1_HANDLER_DMA_WRITE);
 179                 snd_gf1_dma_ack(gus);
 180                 while ((block = gus->gf1.dma_data_pcm)) {
 181                         gus->gf1.dma_data_pcm = block->next;
 182                         kfree(block);
 183                 }
 184                 while ((block = gus->gf1.dma_data_synth)) {
 185                         gus->gf1.dma_data_synth = block->next;
 186                         kfree(block);
 187                 }
 188                 gus->gf1.dma_data_pcm_last =
 189                 gus->gf1.dma_data_synth_last = NULL;
 190         }
 191         mutex_unlock(&gus->dma_mutex);
 192         return 0;
 193 }
 194
 195 int snd_gf1_dma_transfer_block(struct snd_gus_card * gus,
 196                                struct snd_gf1_dma_block * __block,
 197                                int atomic,
 198                                int synth)
 199 {
 200         unsigned long flags;
 201         struct snd_gf1_dma_block *block;
 202
 203         block = kmalloc(sizeof(*block), atomic ? GFP_ATOMIC : GFP_KERNEL);
 204         if (block == NULL) {
 205                 snd_printk(KERN_ERR "gf1: DMA transfer failure; not enough memory\n");
 206                 return -ENOMEM;
 207         }
 208         *block = *__block;
 209         block->next = NULL;
 210
 211         snd_printdd("addr = 0x%x, buffer = 0x%lx, count = 0x%x, cmd = 0x%x\n",
 212                     block->addr, (long) block->buffer, block->count,
 213                     block->cmd);
 214
 215         snd_printdd("gus->gf1.dma_data_pcm_last = 0x%lx\n",
 216                     (long)gus->gf1.dma_data_pcm_last);
 217         snd_printdd("gus->gf1.dma_data_pcm = 0x%lx\n",
 218                     (long)gus->gf1.dma_data_pcm);
 219
 220         spin_lock_irqsave(&gus->dma_lock, flags);
 221         if (synth) {
 222                 if (gus->gf1.dma_data_synth_last) {
 223                         gus->gf1.dma_data_synth_last->next = block;
 224                         gus->gf1.dma_data_synth_last = block;
 225                 } else {
 226                         gus->gf1.dma_data_synth =
 227                         gus->gf1.dma_data_synth_last = block;
 228                 }
 229         } else {
 230                 if (gus->gf1.dma_data_pcm_last) {
 231                         gus->gf1.dma_data_pcm_last->next = block;
 232                         gus->gf1.dma_data_pcm_last = block;
 233                 } else {
 234                         gus->gf1.dma_data_pcm =
 235                         gus->gf1.dma_data_pcm_last = block;
 236                 }
 237         }
 238         if (!(gus->gf1.dma_flags & SNDRV_GF1_DMA_TRIGGER)) {
 239                 gus->gf1.dma_flags |= SNDRV_GF1_DMA_TRIGGER;
 240                 block = snd_gf1_dma_next_block(gus);
 241                 spin_unlock_irqrestore(&gus->dma_lock, flags);
 242                 if (block == NULL)
 243                         return 0;
 244                 snd_gf1_dma_program(gus, block->addr, block->buf_addr, block->count, (unsigned short) block->cmd);
 245                 kfree(block);
 246                 return 0;
 247         }
 248         spin_unlock_irqrestore(&gus->dma_lock, flags);
 249         return 0;
 250 }