Merge git://git.kernel.org/pub/scm/linux/kernel/git/bunk/trivial
[linux-2.6] / sound / oss / sh_dac_audio.c
1 #include <linux/config.h>
2 #include <linux/module.h>
3 #include <linux/init.h>
4 #include <linux/sched.h>
5 #include <linux/linkage.h>
6 #include <linux/slab.h>
7 #include <linux/fs.h>
8 #include <linux/sound.h>
9 #include <linux/soundcard.h>
10 #include <asm/io.h>
11 #include <asm/uaccess.h>
12 #include <asm/irq.h>
13 #include <asm/delay.h>
14 #include <linux/interrupt.h>
15
16 #include <asm/cpu/dac.h>
17
18 #ifdef MACH_HP600
19 #include <asm/hp6xx/hp6xx.h>
20 #include <asm/hd64461/hd64461.h>
21 #endif
22
23 #define MODNAME "sh_dac_audio"
24
25 #define TMU_TOCR_INIT   0x00
26
27 #define TMU1_TCR_INIT   0x0020  /* Clock/4, rising edge; interrupt on */
28 #define TMU1_TSTR_INIT  0x02    /* Bit to turn on TMU1 */
29
30 #define TMU_TSTR        0xfffffe92
31 #define TMU1_TCOR       0xfffffea0
32 #define TMU1_TCNT       0xfffffea4
33 #define TMU1_TCR        0xfffffea8
34
35 #define BUFFER_SIZE 48000
36
37 static int rate;
38 static int empty;
39 static char *data_buffer, *buffer_begin, *buffer_end;
40 static int in_use, device_major;
41
42 static void dac_audio_start_timer(void)
43 {
44         u8 tstr;
45
46         tstr = ctrl_inb(TMU_TSTR);
47         tstr |= TMU1_TSTR_INIT;
48         ctrl_outb(tstr, TMU_TSTR);
49 }
50
51 static void dac_audio_stop_timer(void)
52 {
53         u8 tstr;
54
55         tstr = ctrl_inb(TMU_TSTR);
56         tstr &= ~TMU1_TSTR_INIT;
57         ctrl_outb(tstr, TMU_TSTR);
58 }
59
60 static void dac_audio_reset(void)
61 {
62         dac_audio_stop_timer();
63         buffer_begin = buffer_end = data_buffer;
64         empty = 1;
65 }
66
67 static void dac_audio_sync(void)
68 {
69         while (!empty)
70                 schedule();
71 }
72
73 static void dac_audio_start(void)
74 {
75 #ifdef MACH_HP600
76         u16 v;
77         v = inw(HD64461_GPADR);
78         v &= ~HD64461_GPADR_SPEAKER;
79         outw(v, HD64461_GPADR);
80 #endif
81         sh_dac_enable(CONFIG_SOUND_SH_DAC_AUDIO_CHANNEL);
82         ctrl_outw(TMU1_TCR_INIT, TMU1_TCR);
83 }
84 static void dac_audio_stop(void)
85 {
86 #ifdef MACH_HP600
87         u16 v;
88 #endif
89         dac_audio_stop_timer();
90 #ifdef MACH_HP600
91         v = inw(HD64461_GPADR);
92         v |= HD64461_GPADR_SPEAKER;
93         outw(v, HD64461_GPADR);
94 #endif
95         sh_dac_disable(CONFIG_SOUND_SH_DAC_AUDIO_CHANNEL);
96 }
97
98 static void dac_audio_set_rate(void)
99 {
100         unsigned long interval;
101
102         interval = (current_cpu_data.module_clock / 4) / rate;
103         ctrl_outl(interval, TMU1_TCOR);
104         ctrl_outl(interval, TMU1_TCNT);
105 }
106
107 static int dac_audio_ioctl(struct inode *inode, struct file *file,
108                            unsigned int cmd, unsigned long arg)
109 {
110         int val;
111
112         switch (cmd) {
113         case OSS_GETVERSION:
114                 return put_user(SOUND_VERSION, (int *)arg);
115
116         case SNDCTL_DSP_SYNC:
117                 dac_audio_sync();
118                 return 0;
119
120         case SNDCTL_DSP_RESET:
121                 dac_audio_reset();
122                 return 0;
123
124         case SNDCTL_DSP_GETFMTS:
125                 return put_user(AFMT_U8, (int *)arg);
126
127         case SNDCTL_DSP_SETFMT:
128                 return put_user(AFMT_U8, (int *)arg);
129
130         case SNDCTL_DSP_NONBLOCK:
131                 file->f_flags |= O_NONBLOCK;
132                 return 0;
133
134         case SNDCTL_DSP_GETCAPS:
135                 return 0;
136
137         case SOUND_PCM_WRITE_RATE:
138                 val = *(int *)arg;
139                 if (val > 0) {
140                         rate = val;
141                         dac_audio_set_rate();
142                 }
143                 return put_user(rate, (int *)arg);
144
145         case SNDCTL_DSP_STEREO:
146                 return put_user(0, (int *)arg);
147
148         case SOUND_PCM_WRITE_CHANNELS:
149                 return put_user(1, (int *)arg);
150
151         case SNDCTL_DSP_SETDUPLEX:
152                 return -EINVAL;
153
154         case SNDCTL_DSP_PROFILE:
155                 return -EINVAL;
156
157         case SNDCTL_DSP_GETBLKSIZE:
158                 return put_user(BUFFER_SIZE, (int *)arg);
159
160         case SNDCTL_DSP_SETFRAGMENT:
161                 return 0;
162
163         default:
164                 printk(KERN_ERR "sh_dac_audio: unimplemented ioctl=0x%x\n",
165                        cmd);
166                 return -EINVAL;
167         }
168         return -EINVAL;
169 }
170
171 static ssize_t dac_audio_write(struct file *file, const char *buf, size_t count,
172                                loff_t * ppos)
173 {
174         int free;
175         int nbytes;
176
177         if (count < 0)
178                 return -EINVAL;
179
180         if (!count) {
181                 dac_audio_sync();
182                 return 0;
183         }
184
185         free = buffer_begin - buffer_end;
186
187         if (free < 0)
188                 free += BUFFER_SIZE;
189         if ((free == 0) && (empty))
190                 free = BUFFER_SIZE;
191         if (count > free)
192                 count = free;
193         if (buffer_begin > buffer_end) {
194                 if (copy_from_user((void *)buffer_end, buf, count))
195                         return -EFAULT;
196
197                 buffer_end += count;
198         } else {
199                 nbytes = data_buffer + BUFFER_SIZE - buffer_end;
200                 if (nbytes > count) {
201                         if (copy_from_user((void *)buffer_end, buf, count))
202                                 return -EFAULT;
203                         buffer_end += count;
204                 } else {
205                         if (copy_from_user((void *)buffer_end, buf, nbytes))
206                                 return -EFAULT;
207                         if (copy_from_user
208                             ((void *)data_buffer, buf + nbytes, count - nbytes))
209                                 return -EFAULT;
210                         buffer_end = data_buffer + count - nbytes;
211                 }
212         }
213
214         if (empty) {
215                 empty = 0;
216                 dac_audio_start_timer();
217         }
218
219         return count;
220 }
221
222 static ssize_t dac_audio_read(struct file *file, char *buf, size_t count,
223                               loff_t * ppos)
224 {
225         return -EINVAL;
226 }
227
228 static int dac_audio_open(struct inode *inode, struct file *file)
229 {
230         if (file->f_mode & FMODE_READ)
231                 return -ENODEV;
232         if (in_use)
233                 return -EBUSY;
234
235         in_use = 1;
236
237         dac_audio_start();
238
239         return 0;
240 }
241
242 static int dac_audio_release(struct inode *inode, struct file *file)
243 {
244         dac_audio_sync();
245         dac_audio_stop();
246         in_use = 0;
247
248         return 0;
249 }
250
251 struct file_operations dac_audio_fops = {
252       .read =           dac_audio_read,
253       .write =  dac_audio_write,
254       .ioctl =  dac_audio_ioctl,
255       .open =           dac_audio_open,
256       .release =        dac_audio_release,
257 };
258
259 static irqreturn_t timer1_interrupt(int irq, void *dev, struct pt_regs *regs)
260 {
261         unsigned long timer_status;
262
263         timer_status = ctrl_inw(TMU1_TCR);
264         timer_status &= ~0x100;
265         ctrl_outw(timer_status, TMU1_TCR);
266
267         if (!empty) {
268                 sh_dac_output(*buffer_begin, CONFIG_SOUND_SH_DAC_AUDIO_CHANNEL);
269                 buffer_begin++;
270
271                 if (buffer_begin == data_buffer + BUFFER_SIZE)
272                         buffer_begin = data_buffer;
273                 if (buffer_begin == buffer_end) {
274                         empty = 1;
275                         dac_audio_stop_timer();
276                 }
277         }
278         return IRQ_HANDLED;
279 }
280
281 static int __init dac_audio_init(void)
282 {
283         int retval;
284
285         if ((device_major = register_sound_dsp(&dac_audio_fops, -1)) < 0) {
286                 printk(KERN_ERR "Cannot register dsp device");
287                 return device_major;
288         }
289
290         in_use = 0;
291
292         data_buffer = (char *)kmalloc(BUFFER_SIZE, GFP_KERNEL);
293         if (data_buffer == NULL)
294                 return -ENOMEM;
295
296         dac_audio_reset();
297         rate = 8000;
298         dac_audio_set_rate();
299
300         retval =
301             request_irq(TIMER1_IRQ, timer1_interrupt, SA_INTERRUPT, MODNAME, 0);
302         if (retval < 0) {
303                 printk(KERN_ERR "sh_dac_audio: IRQ %d request failed\n",
304                        TIMER1_IRQ);
305                 return retval;
306         }
307
308         return 0;
309 }
310
311 static void __exit dac_audio_exit(void)
312 {
313         free_irq(TIMER1_IRQ, 0);
314
315         unregister_sound_dsp(device_major);
316         kfree((void *)data_buffer);
317 }
318
319 module_init(dac_audio_init);
320 module_exit(dac_audio_exit);
321
322 MODULE_AUTHOR("Andriy Skulysh, askulysh@image.kiev.ua");
323 MODULE_DESCRIPTION("SH DAC sound driver");
324 MODULE_LICENSE("GPL");