Merge branch 'topic/ca0106' into for-linus
[sfrench/cifs-2.6.git] / 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 }