release/src-rt-6.x/linux/linux-2.6/sound/isa/gus/gus_dma.c

   1 /*
   2  *  Routines for GF1 DMA control
   3  *  Copyright (c) by Jaroslav Kysela <perex@suse.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 <sound/driver.h>
  23 #include <asm/dma.h>
  24 #include <linux/slab.h>
  25 #include <sound/core.h>
  26 #include <sound/gus.h>
  27
  28 static void snd_gf1_dma_ack(struct snd_gus_card * gus)
  29 {
  30         unsigned long flags;
  31
  32         spin_lock_irqsave(&gus->reg_lock, flags);
  33         snd_gf1_write8(gus, SNDRV_GF1_GB_DRAM_DMA_CONTROL, 0x00);
  34         snd_gf1_look8(gus, SNDRV_GF1_GB_DRAM_DMA_CONTROL);
  35         spin_unlock_irqrestore(&gus->reg_lock, flags);
  36 }
  37
  38 static void snd_gf1_dma_program(struct snd_gus_card * gus,
  39                                 unsigned int addr,
  40                                 unsigned long buf_addr,
  41                                 unsigned int count,
  42                                 unsigned int cmd)
  43 {
  44         unsigned long flags;
  45         unsigned int address;
  46         unsigned char dma_cmd;
  47         unsigned int address_high;
  48
  49         // snd_printk("dma_transfer: addr=0x%x, buf=0x%lx, count=0x%x\n", addr, (long) buf, 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("address = 0x%x, count = 0x%x, dma_cmd = 0x%x\n", address << 1, count, dma_cmd);
  82 #endif
  83         spin_lock_irqsave(&gus->reg_lock, flags);
  84         if (gus->gf1.enh_mode) {
  85                 address_high = ((address >> 16) & 0x000000f0) | (address & 0x0000000f);
  86                 snd_gf1_write16(gus, SNDRV_GF1_GW_DRAM_DMA_LOW, (unsigned short) (address >> 4));
  87                 snd_gf1_write8(gus, SNDRV_GF1_GB_DRAM_DMA_HIGH, (unsigned char) address_high);
  88         } else
  89                 snd_gf1_write16(gus, SNDRV_GF1_GW_DRAM_DMA_LOW, (unsigned short) (address >> 4));
  90         snd_gf1_write8(gus, SNDRV_GF1_GB_DRAM_DMA_CONTROL, dma_cmd);
  91         spin_unlock_irqrestore(&gus->reg_lock, flags);
  92 }
  93
  94 static struct snd_gf1_dma_block *snd_gf1_dma_next_block(struct snd_gus_card * gus)
  95 {
  96         struct snd_gf1_dma_block *block;
  97
  98         /* PCM block have bigger priority than synthesizer one */
  99         if (gus->gf1.dma_data_pcm) {
 100                 block = gus->gf1.dma_data_pcm;
 101                 if (gus->gf1.dma_data_pcm_last == block) {
 102                         gus->gf1.dma_data_pcm =
 103                         gus->gf1.dma_data_pcm_last = NULL;
 104                 } else {
 105                         gus->gf1.dma_data_pcm = block->next;
 106                 }
 107         } else if (gus->gf1.dma_data_synth) {
 108                 block = gus->gf1.dma_data_synth;
 109                 if (gus->gf1.dma_data_synth_last == block) {
 110                         gus->gf1.dma_data_synth =
 111                         gus->gf1.dma_data_synth_last = NULL;
 112                 } else {
 113                         gus->gf1.dma_data_synth = block->next;
 114                 }
 115         } else {
 116                 block = NULL;
 117         }
 118         if (block) {
 119                 gus->gf1.dma_ack = block->ack;
 120                 gus->gf1.dma_private_data = block->private_data;
 121         }
 122         return block;
 123 }
 124
 125
 126 static void snd_gf1_dma_interrupt(struct snd_gus_card * gus)
 127 {
 128         struct snd_gf1_dma_block *block;
 129
 130         snd_gf1_dma_ack(gus);
 131         if (gus->gf1.dma_ack)
 132                 gus->gf1.dma_ack(gus, gus->gf1.dma_private_data);
 133         spin_lock(&gus->dma_lock);
 134         if (gus->gf1.dma_data_pcm == NULL &&
 135             gus->gf1.dma_data_synth == NULL) {
 136                 gus->gf1.dma_ack = NULL;
 137                 gus->gf1.dma_flags &= ~SNDRV_GF1_DMA_TRIGGER;
 138                 spin_unlock(&gus->dma_lock);
 139                 return;
 140         }
 141         block = snd_gf1_dma_next_block(gus);
 142         spin_unlock(&gus->dma_lock);
 143         snd_gf1_dma_program(gus, block->addr, block->buf_addr, block->count, (unsigned short) block->cmd);
 144         kfree(block);
 145 #if 0
 146         printk("program dma (IRQ) - addr = 0x%x, buffer = 0x%lx, count = 0x%x, cmd = 0x%x\n", addr, (long) buffer, count, cmd);
 147 #endif
 148 }
 149
 150 int snd_gf1_dma_init(struct snd_gus_card * gus)
 151 {
 152         mutex_lock(&gus->dma_mutex);
 153         gus->gf1.dma_shared++;
 154         if (gus->gf1.dma_shared > 1) {
 155                 mutex_unlock(&gus->dma_mutex);
 156                 return 0;
 157         }
 158         gus->gf1.interrupt_handler_dma_write = snd_gf1_dma_interrupt;
 159         gus->gf1.dma_data_pcm =
 160         gus->gf1.dma_data_pcm_last =
 161         gus->gf1.dma_data_synth =
 162         gus->gf1.dma_data_synth_last = NULL;
 163         mutex_unlock(&gus->dma_mutex);
 164         return 0;
 165 }
 166
 167 int snd_gf1_dma_done(struct snd_gus_card * gus)
 168 {
 169         struct snd_gf1_dma_block *block;
 170
 171         mutex_lock(&gus->dma_mutex);
 172         gus->gf1.dma_shared--;
 173         if (!gus->gf1.dma_shared) {
 174                 snd_dma_disable(gus->gf1.dma1);
 175                 snd_gf1_set_default_handlers(gus, SNDRV_GF1_HANDLER_DMA_WRITE);
 176                 snd_gf1_dma_ack(gus);
 177                 while ((block = gus->gf1.dma_data_pcm)) {
 178                         gus->gf1.dma_data_pcm = block->next;
 179                         kfree(block);
 180                 }
 181                 while ((block = gus->gf1.dma_data_synth)) {
 182                         gus->gf1.dma_data_synth = block->next;
 183                         kfree(block);
 184                 }
 185                 gus->gf1.dma_data_pcm_last =
 186                 gus->gf1.dma_data_synth_last = NULL;
 187         }
 188         mutex_unlock(&gus->dma_mutex);
 189         return 0;
 190 }
 191
 192 int snd_gf1_dma_transfer_block(struct snd_gus_card * gus,
 193                                struct snd_gf1_dma_block * __block,
 194                                int atomic,
 195                                int synth)
 196 {
 197         unsigned long flags;
 198         struct snd_gf1_dma_block *block;
 199
 200         block = kmalloc(sizeof(*block), atomic ? GFP_ATOMIC : GFP_KERNEL);
 201         if (block == NULL) {
 202                 snd_printk(KERN_ERR "gf1: DMA transfer failure; not enough memory\n");
 203                 return -ENOMEM;
 204         }
 205         *block = *__block;
 206         block->next = NULL;
 207 #if 0
 208         printk("addr = 0x%x, buffer = 0x%lx, count = 0x%x, cmd = 0x%x\n", block->addr, (long) block->buffer, block->count, block->cmd);
 209 #endif
 210 #if 0
 211         printk("gus->gf1.dma_data_pcm_last = 0x%lx\n", (long)gus->gf1.dma_data_pcm_last);
 212         printk("gus->gf1.dma_data_pcm = 0x%lx\n", (long)gus->gf1.dma_data_pcm);
 213 #endif
 214         spin_lock_irqsave(&gus->dma_lock, flags);
 215         if (synth) {
 216                 if (gus->gf1.dma_data_synth_last) {
 217                         gus->gf1.dma_data_synth_last->next = block;
 218                         gus->gf1.dma_data_synth_last = block;
 219                 } else {
 220                         gus->gf1.dma_data_synth =
 221                         gus->gf1.dma_data_synth_last = block;
 222                 }
 223         } else {
 224                 if (gus->gf1.dma_data_pcm_last) {
 225                         gus->gf1.dma_data_pcm_last->next = block;
 226                         gus->gf1.dma_data_pcm_last = block;
 227                 } else {
 228                         gus->gf1.dma_data_pcm =
 229                         gus->gf1.dma_data_pcm_last = block;
 230                 }
 231         }
 232         if (!(gus->gf1.dma_flags & SNDRV_GF1_DMA_TRIGGER)) {
 233                 gus->gf1.dma_flags |= SNDRV_GF1_DMA_TRIGGER;
 234                 block = snd_gf1_dma_next_block(gus);
 235                 spin_unlock_irqrestore(&gus->dma_lock, flags);
 236                 if (block == NULL)
 237                         return 0;
 238                 snd_gf1_dma_program(gus, block->addr, block->buf_addr, block->count, (unsigned short) block->cmd);
 239                 kfree(block);
 240                 return 0;
 241         }
 242         spin_unlock_irqrestore(&gus->dma_lock, flags);
 243         return 0;
 244 }