1 /*
2 * sound/oss/sh_dac_audio.c
3 *
4 * SH DAC based sound :(
5 *
6 * Copyright (C) 2004,2005 Andriy Skulysh
7 *
8 * This file is subject to the terms and conditions of the GNU General Public
9 * License. See the file "COPYING" in the main directory of this archive
10 * for more details.
11 */
12 #include <linux/module.h>
13 #include <linux/init.h>
14 #include <linux/sched.h>
15 #include <linux/linkage.h>
16 #include <linux/slab.h>
17 #include <linux/fs.h>
18 #include <linux/sound.h>
19 #include <linux/soundcard.h>
20 #include <linux/interrupt.h>
21 #include <asm/io.h>
22 #include <asm/uaccess.h>
23 #include <asm/irq.h>
24 #include <asm/delay.h>
25 #include <asm/clock.h>
26 #include <asm/cpu/dac.h>
27 #include <asm/cpu/timer.h>
28 #include <asm/machvec.h>
29 #include <mach/hp6xx.h>
30 #include <asm/hd64461.h>
31
32 #define MODNAME "sh_dac_audio"
33
34 #define TMU_TOCR_INIT 0x00
35
36 #define TMU1_TCR_INIT 0x0020 /* Clock/4, rising edge; interrupt on */
37 #define TMU1_TSTR_INIT 0x02 /* Bit to turn on TMU1 */
38
39 #define BUFFER_SIZE 48000
40
41 static int rate;
42 static int empty;
43 static char *data_buffer, *buffer_begin, *buffer_end;
44 static int in_use, device_major;
45
dac_audio_start_timer(void)46 static void dac_audio_start_timer(void)
47 {
48 u8 tstr;
49
50 tstr = ctrl_inb(TMU_TSTR);
51 tstr |= TMU1_TSTR_INIT;
52 ctrl_outb(tstr, TMU_TSTR);
53 }
54
dac_audio_stop_timer(void)55 static void dac_audio_stop_timer(void)
56 {
57 u8 tstr;
58
59 tstr = ctrl_inb(TMU_TSTR);
60 tstr &= ~TMU1_TSTR_INIT;
61 ctrl_outb(tstr, TMU_TSTR);
62 }
63
dac_audio_reset(void)64 static void dac_audio_reset(void)
65 {
66 dac_audio_stop_timer();
67 buffer_begin = buffer_end = data_buffer;
68 empty = 1;
69 }
70
dac_audio_sync(void)71 static void dac_audio_sync(void)
72 {
73 while (!empty)
74 schedule();
75 }
76
dac_audio_start(void)77 static void dac_audio_start(void)
78 {
79 if (mach_is_hp6xx()) {
80 u16 v = inw(HD64461_GPADR);
81 v &= ~HD64461_GPADR_SPEAKER;
82 outw(v, HD64461_GPADR);
83 }
84
85 sh_dac_enable(CONFIG_SOUND_SH_DAC_AUDIO_CHANNEL);
86 ctrl_outw(TMU1_TCR_INIT, TMU1_TCR);
87 }
dac_audio_stop(void)88 static void dac_audio_stop(void)
89 {
90 dac_audio_stop_timer();
91
92 if (mach_is_hp6xx()) {
93 u16 v = inw(HD64461_GPADR);
94 v |= HD64461_GPADR_SPEAKER;
95 outw(v, HD64461_GPADR);
96 }
97
98 sh_dac_output(0, CONFIG_SOUND_SH_DAC_AUDIO_CHANNEL);
99 sh_dac_disable(CONFIG_SOUND_SH_DAC_AUDIO_CHANNEL);
100 }
101
dac_audio_set_rate(void)102 static void dac_audio_set_rate(void)
103 {
104 unsigned long interval;
105 struct clk *clk;
106
107 clk = clk_get(NULL, "module_clk");
108 interval = (clk_get_rate(clk) / 4) / rate;
109 clk_put(clk);
110 ctrl_outl(interval, TMU1_TCOR);
111 ctrl_outl(interval, TMU1_TCNT);
112 }
113
dac_audio_ioctl(struct inode * inode,struct file * file,unsigned int cmd,unsigned long arg)114 static int dac_audio_ioctl(struct inode *inode, struct file *file,
115 unsigned int cmd, unsigned long arg)
116 {
117 int val;
118
119 switch (cmd) {
120 case OSS_GETVERSION:
121 return put_user(SOUND_VERSION, (int *)arg);
122
123 case SNDCTL_DSP_SYNC:
124 dac_audio_sync();
125 return 0;
126
127 case SNDCTL_DSP_RESET:
128 dac_audio_reset();
129 return 0;
130
131 case SNDCTL_DSP_GETFMTS:
132 return put_user(AFMT_U8, (int *)arg);
133
134 case SNDCTL_DSP_SETFMT:
135 return put_user(AFMT_U8, (int *)arg);
136
137 case SNDCTL_DSP_NONBLOCK:
138 file->f_flags |= O_NONBLOCK;
139 return 0;
140
141 case SNDCTL_DSP_GETCAPS:
142 return 0;
143
144 case SOUND_PCM_WRITE_RATE:
145 val = *(int *)arg;
146 if (val > 0) {
147 rate = val;
148 dac_audio_set_rate();
149 }
150 return put_user(rate, (int *)arg);
151
152 case SNDCTL_DSP_STEREO:
153 return put_user(0, (int *)arg);
154
155 case SOUND_PCM_WRITE_CHANNELS:
156 return put_user(1, (int *)arg);
157
158 case SNDCTL_DSP_SETDUPLEX:
159 return -EINVAL;
160
161 case SNDCTL_DSP_PROFILE:
162 return -EINVAL;
163
164 case SNDCTL_DSP_GETBLKSIZE:
165 return put_user(BUFFER_SIZE, (int *)arg);
166
167 case SNDCTL_DSP_SETFRAGMENT:
168 return 0;
169
170 default:
171 printk(KERN_ERR "sh_dac_audio: unimplemented ioctl=0x%x\n",
172 cmd);
173 return -EINVAL;
174 }
175 return -EINVAL;
176 }
177
dac_audio_write(struct file * file,const char * buf,size_t count,loff_t * ppos)178 static ssize_t dac_audio_write(struct file *file, const char *buf, size_t count,
179 loff_t * ppos)
180 {
181 int free;
182 int nbytes;
183
184 if (count < 0)
185 return -EINVAL;
186
187 if (!count) {
188 dac_audio_sync();
189 return 0;
190 }
191
192 free = buffer_begin - buffer_end;
193
194 if (free < 0)
195 free += BUFFER_SIZE;
196 if ((free == 0) && (empty))
197 free = BUFFER_SIZE;
198 if (count > free)
199 count = free;
200 if (buffer_begin > buffer_end) {
201 if (copy_from_user((void *)buffer_end, buf, count))
202 return -EFAULT;
203
204 buffer_end += count;
205 } else {
206 nbytes = data_buffer + BUFFER_SIZE - buffer_end;
207 if (nbytes > count) {
208 if (copy_from_user((void *)buffer_end, buf, count))
209 return -EFAULT;
210 buffer_end += count;
211 } else {
212 if (copy_from_user((void *)buffer_end, buf, nbytes))
213 return -EFAULT;
214 if (copy_from_user
215 ((void *)data_buffer, buf + nbytes, count - nbytes))
216 return -EFAULT;
217 buffer_end = data_buffer + count - nbytes;
218 }
219 }
220
221 if (empty) {
222 empty = 0;
223 dac_audio_start_timer();
224 }
225
226 return count;
227 }
228
dac_audio_read(struct file * file,char * buf,size_t count,loff_t * ppos)229 static ssize_t dac_audio_read(struct file *file, char *buf, size_t count,
230 loff_t * ppos)
231 {
232 return -EINVAL;
233 }
234
dac_audio_open(struct inode * inode,struct file * file)235 static int dac_audio_open(struct inode *inode, struct file *file)
236 {
237 if (file->f_mode & FMODE_READ)
238 return -ENODEV;
239 if (in_use)
240 return -EBUSY;
241
242 in_use = 1;
243
244 dac_audio_start();
245
246 return 0;
247 }
248
dac_audio_release(struct inode * inode,struct file * file)249 static int dac_audio_release(struct inode *inode, struct file *file)
250 {
251 dac_audio_sync();
252 dac_audio_stop();
253 in_use = 0;
254
255 return 0;
256 }
257
258 const struct file_operations dac_audio_fops = {
259 .read = dac_audio_read,
260 .write = dac_audio_write,
261 .ioctl = dac_audio_ioctl,
262 .open = dac_audio_open,
263 .release = dac_audio_release,
264 };
265
timer1_interrupt(int irq,void * dev)266 static irqreturn_t timer1_interrupt(int irq, void *dev)
267 {
268 unsigned long timer_status;
269
270 timer_status = ctrl_inw(TMU1_TCR);
271 timer_status &= ~0x100;
272 ctrl_outw(timer_status, TMU1_TCR);
273
274 if (!empty) {
275 sh_dac_output(*buffer_begin, CONFIG_SOUND_SH_DAC_AUDIO_CHANNEL);
276 buffer_begin++;
277
278 if (buffer_begin == data_buffer + BUFFER_SIZE)
279 buffer_begin = data_buffer;
280 if (buffer_begin == buffer_end) {
281 empty = 1;
282 dac_audio_stop_timer();
283 }
284 }
285 return IRQ_HANDLED;
286 }
287
dac_audio_init(void)288 static int __init dac_audio_init(void)
289 {
290 int retval;
291
292 if ((device_major = register_sound_dsp(&dac_audio_fops, -1)) < 0) {
293 printk(KERN_ERR "Cannot register dsp device");
294 return device_major;
295 }
296
297 in_use = 0;
298
299 data_buffer = kmalloc(BUFFER_SIZE, GFP_KERNEL);
300 if (data_buffer == NULL)
301 return -ENOMEM;
302
303 dac_audio_reset();
304 rate = 8000;
305 dac_audio_set_rate();
306
307 retval =
308 request_irq(TIMER1_IRQ, timer1_interrupt, IRQF_DISABLED, MODNAME, 0);
309 if (retval < 0) {
310 printk(KERN_ERR "sh_dac_audio: IRQ %d request failed\n",
311 TIMER1_IRQ);
312 return retval;
313 }
314
315 return 0;
316 }
317
dac_audio_exit(void)318 static void __exit dac_audio_exit(void)
319 {
320 free_irq(TIMER1_IRQ, 0);
321
322 unregister_sound_dsp(device_major);
323 kfree((void *)data_buffer);
324 }
325
326 module_init(dac_audio_init);
327 module_exit(dac_audio_exit);
328
329 MODULE_AUTHOR("Andriy Skulysh, askulysh@image.kiev.ua");
330 MODULE_DESCRIPTION("SH DAC sound driver");
331 MODULE_LICENSE("GPL");
332