ef1b2e9832e4601e53288d7cdc4c613206ddd7ad
[linux-2.6.git] / 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(snd_gus_card_t * 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(snd_gus_card_t * 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 snd_gf1_dma_block_t *snd_gf1_dma_next_block(snd_gus_card_t * gus)
95 {
96         snd_gf1_dma_block_t *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(snd_gus_card_t * gus)
127 {
128         snd_gf1_dma_block_t *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(snd_gus_card_t * gus)
151 {
152         down(&gus->dma_mutex);
153         gus->gf1.dma_shared++;
154         if (gus->gf1.dma_shared > 1) {
155                 up(&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         up(&gus->dma_mutex);
164         return 0;
165 }
166
167 int snd_gf1_dma_done(snd_gus_card_t * gus)
168 {
169         snd_gf1_dma_block_t *block;
170
171         down(&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         up(&gus->dma_mutex);
189         return 0;
190 }
191
192 int snd_gf1_dma_transfer_block(snd_gus_card_t * gus,
193                                snd_gf1_dma_block_t * __block,
194                                int atomic,
195                                int synth)
196 {
197         unsigned long flags;
198         snd_gf1_dma_block_t *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 }