Commit | Line | Data |
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7e27b9b7 AS |
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 | */ | |
1da177e4 LT |
12 | #include <linux/module.h> |
13 | #include <linux/init.h> | |
14 | #include <linux/sched.h> | |
1da177e4 LT |
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> | |
4bcac20a | 20 | #include <linux/interrupt.h> |
1da177e4 LT |
21 | #include <asm/io.h> |
22 | #include <asm/uaccess.h> | |
23 | #include <asm/irq.h> | |
24 | #include <asm/delay.h> | |
7e27b9b7 | 25 | #include <asm/clock.h> |
1da177e4 | 26 | #include <asm/cpu/dac.h> |
7e27b9b7 | 27 | #include <asm/cpu/timer.h> |
4bcac20a | 28 | #include <asm/machvec.h> |
082c44d2 | 29 | #include <asm/hp6xx.h> |
7e27b9b7 | 30 | #include <asm/hd64461.h> |
1da177e4 LT |
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 | ||
1da177e4 LT |
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 | ||
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 | ||
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 | ||
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 | ||
71 | static void dac_audio_sync(void) | |
72 | { | |
73 | while (!empty) | |
74 | schedule(); | |
75 | } | |
76 | ||
77 | static void dac_audio_start(void) | |
78 | { | |
4bcac20a AS |
79 | if (mach_is_hp6xx()) { |
80 | u16 v = inw(HD64461_GPADR); | |
81 | v &= ~HD64461_GPADR_SPEAKER; | |
82 | outw(v, HD64461_GPADR); | |
83 | } | |
84 | ||
1da177e4 LT |
85 | sh_dac_enable(CONFIG_SOUND_SH_DAC_AUDIO_CHANNEL); |
86 | ctrl_outw(TMU1_TCR_INIT, TMU1_TCR); | |
87 | } | |
88 | static void dac_audio_stop(void) | |
89 | { | |
1da177e4 | 90 | dac_audio_stop_timer(); |
4bcac20a AS |
91 | |
92 | if (mach_is_hp6xx()) { | |
93 | u16 v = inw(HD64461_GPADR); | |
94 | v |= HD64461_GPADR_SPEAKER; | |
95 | outw(v, HD64461_GPADR); | |
96 | } | |
97 | ||
7e27b9b7 | 98 | sh_dac_output(0, CONFIG_SOUND_SH_DAC_AUDIO_CHANNEL); |
1da177e4 LT |
99 | sh_dac_disable(CONFIG_SOUND_SH_DAC_AUDIO_CHANNEL); |
100 | } | |
101 | ||
102 | static void dac_audio_set_rate(void) | |
103 | { | |
104 | unsigned long interval; | |
7e27b9b7 | 105 | struct clk *clk; |
1da177e4 | 106 | |
5753171b | 107 | clk = clk_get(NULL, "module_clk"); |
7e27b9b7 AS |
108 | interval = (clk_get_rate(clk) / 4) / rate; |
109 | clk_put(clk); | |
1da177e4 LT |
110 | ctrl_outl(interval, TMU1_TCOR); |
111 | ctrl_outl(interval, TMU1_TCNT); | |
112 | } | |
113 | ||
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 | ||
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 | ||
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 | ||
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 | ||
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 | ||
9c2e08c5 | 258 | const struct file_operations dac_audio_fops = { |
1da177e4 LT |
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 | ||
7d12e780 | 266 | static irqreturn_t timer1_interrupt(int irq, void *dev) |
1da177e4 LT |
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 | ||
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 | ||
4fa95ef6 | 299 | data_buffer = kmalloc(BUFFER_SIZE, GFP_KERNEL); |
1da177e4 LT |
300 | if (data_buffer == NULL) |
301 | return -ENOMEM; | |
302 | ||
303 | dac_audio_reset(); | |
304 | rate = 8000; | |
305 | dac_audio_set_rate(); | |
306 | ||
307 | retval = | |
65ca68b3 | 308 | request_irq(TIMER1_IRQ, timer1_interrupt, IRQF_DISABLED, MODNAME, 0); |
1da177e4 LT |
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 | ||
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"); |