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1da177e4 LT |
1 | #include <linux/config.h> |
2 | #include <linux/module.h> | |
3 | #include <linux/init.h> | |
4 | #include <linux/sched.h> | |
1da177e4 LT |
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"); |