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1da177e4 LT |
1 | #include <linux/module.h> |
2 | #include <linux/init.h> | |
3 | #include <linux/sched.h> | |
1da177e4 LT |
4 | #include <linux/linkage.h> |
5 | #include <linux/slab.h> | |
6 | #include <linux/fs.h> | |
7 | #include <linux/sound.h> | |
8 | #include <linux/soundcard.h> | |
9 | #include <asm/io.h> | |
10 | #include <asm/uaccess.h> | |
11 | #include <asm/irq.h> | |
12 | #include <asm/delay.h> | |
13 | #include <linux/interrupt.h> | |
14 | ||
15 | #include <asm/cpu/dac.h> | |
16 | ||
17 | #ifdef MACH_HP600 | |
18 | #include <asm/hp6xx/hp6xx.h> | |
19 | #include <asm/hd64461/hd64461.h> | |
20 | #endif | |
21 | ||
22 | #define MODNAME "sh_dac_audio" | |
23 | ||
24 | #define TMU_TOCR_INIT 0x00 | |
25 | ||
26 | #define TMU1_TCR_INIT 0x0020 /* Clock/4, rising edge; interrupt on */ | |
27 | #define TMU1_TSTR_INIT 0x02 /* Bit to turn on TMU1 */ | |
28 | ||
29 | #define TMU_TSTR 0xfffffe92 | |
30 | #define TMU1_TCOR 0xfffffea0 | |
31 | #define TMU1_TCNT 0xfffffea4 | |
32 | #define TMU1_TCR 0xfffffea8 | |
33 | ||
34 | #define BUFFER_SIZE 48000 | |
35 | ||
36 | static int rate; | |
37 | static int empty; | |
38 | static char *data_buffer, *buffer_begin, *buffer_end; | |
39 | static int in_use, device_major; | |
40 | ||
41 | static void dac_audio_start_timer(void) | |
42 | { | |
43 | u8 tstr; | |
44 | ||
45 | tstr = ctrl_inb(TMU_TSTR); | |
46 | tstr |= TMU1_TSTR_INIT; | |
47 | ctrl_outb(tstr, TMU_TSTR); | |
48 | } | |
49 | ||
50 | static void dac_audio_stop_timer(void) | |
51 | { | |
52 | u8 tstr; | |
53 | ||
54 | tstr = ctrl_inb(TMU_TSTR); | |
55 | tstr &= ~TMU1_TSTR_INIT; | |
56 | ctrl_outb(tstr, TMU_TSTR); | |
57 | } | |
58 | ||
59 | static void dac_audio_reset(void) | |
60 | { | |
61 | dac_audio_stop_timer(); | |
62 | buffer_begin = buffer_end = data_buffer; | |
63 | empty = 1; | |
64 | } | |
65 | ||
66 | static void dac_audio_sync(void) | |
67 | { | |
68 | while (!empty) | |
69 | schedule(); | |
70 | } | |
71 | ||
72 | static void dac_audio_start(void) | |
73 | { | |
74 | #ifdef MACH_HP600 | |
75 | u16 v; | |
76 | v = inw(HD64461_GPADR); | |
77 | v &= ~HD64461_GPADR_SPEAKER; | |
78 | outw(v, HD64461_GPADR); | |
79 | #endif | |
80 | sh_dac_enable(CONFIG_SOUND_SH_DAC_AUDIO_CHANNEL); | |
81 | ctrl_outw(TMU1_TCR_INIT, TMU1_TCR); | |
82 | } | |
83 | static void dac_audio_stop(void) | |
84 | { | |
85 | #ifdef MACH_HP600 | |
86 | u16 v; | |
87 | #endif | |
88 | dac_audio_stop_timer(); | |
89 | #ifdef MACH_HP600 | |
90 | v = inw(HD64461_GPADR); | |
91 | v |= HD64461_GPADR_SPEAKER; | |
92 | outw(v, HD64461_GPADR); | |
93 | #endif | |
94 | sh_dac_disable(CONFIG_SOUND_SH_DAC_AUDIO_CHANNEL); | |
95 | } | |
96 | ||
97 | static void dac_audio_set_rate(void) | |
98 | { | |
99 | unsigned long interval; | |
100 | ||
101 | interval = (current_cpu_data.module_clock / 4) / rate; | |
102 | ctrl_outl(interval, TMU1_TCOR); | |
103 | ctrl_outl(interval, TMU1_TCNT); | |
104 | } | |
105 | ||
106 | static int dac_audio_ioctl(struct inode *inode, struct file *file, | |
107 | unsigned int cmd, unsigned long arg) | |
108 | { | |
109 | int val; | |
110 | ||
111 | switch (cmd) { | |
112 | case OSS_GETVERSION: | |
113 | return put_user(SOUND_VERSION, (int *)arg); | |
114 | ||
115 | case SNDCTL_DSP_SYNC: | |
116 | dac_audio_sync(); | |
117 | return 0; | |
118 | ||
119 | case SNDCTL_DSP_RESET: | |
120 | dac_audio_reset(); | |
121 | return 0; | |
122 | ||
123 | case SNDCTL_DSP_GETFMTS: | |
124 | return put_user(AFMT_U8, (int *)arg); | |
125 | ||
126 | case SNDCTL_DSP_SETFMT: | |
127 | return put_user(AFMT_U8, (int *)arg); | |
128 | ||
129 | case SNDCTL_DSP_NONBLOCK: | |
130 | file->f_flags |= O_NONBLOCK; | |
131 | return 0; | |
132 | ||
133 | case SNDCTL_DSP_GETCAPS: | |
134 | return 0; | |
135 | ||
136 | case SOUND_PCM_WRITE_RATE: | |
137 | val = *(int *)arg; | |
138 | if (val > 0) { | |
139 | rate = val; | |
140 | dac_audio_set_rate(); | |
141 | } | |
142 | return put_user(rate, (int *)arg); | |
143 | ||
144 | case SNDCTL_DSP_STEREO: | |
145 | return put_user(0, (int *)arg); | |
146 | ||
147 | case SOUND_PCM_WRITE_CHANNELS: | |
148 | return put_user(1, (int *)arg); | |
149 | ||
150 | case SNDCTL_DSP_SETDUPLEX: | |
151 | return -EINVAL; | |
152 | ||
153 | case SNDCTL_DSP_PROFILE: | |
154 | return -EINVAL; | |
155 | ||
156 | case SNDCTL_DSP_GETBLKSIZE: | |
157 | return put_user(BUFFER_SIZE, (int *)arg); | |
158 | ||
159 | case SNDCTL_DSP_SETFRAGMENT: | |
160 | return 0; | |
161 | ||
162 | default: | |
163 | printk(KERN_ERR "sh_dac_audio: unimplemented ioctl=0x%x\n", | |
164 | cmd); | |
165 | return -EINVAL; | |
166 | } | |
167 | return -EINVAL; | |
168 | } | |
169 | ||
170 | static ssize_t dac_audio_write(struct file *file, const char *buf, size_t count, | |
171 | loff_t * ppos) | |
172 | { | |
173 | int free; | |
174 | int nbytes; | |
175 | ||
176 | if (count < 0) | |
177 | return -EINVAL; | |
178 | ||
179 | if (!count) { | |
180 | dac_audio_sync(); | |
181 | return 0; | |
182 | } | |
183 | ||
184 | free = buffer_begin - buffer_end; | |
185 | ||
186 | if (free < 0) | |
187 | free += BUFFER_SIZE; | |
188 | if ((free == 0) && (empty)) | |
189 | free = BUFFER_SIZE; | |
190 | if (count > free) | |
191 | count = free; | |
192 | if (buffer_begin > buffer_end) { | |
193 | if (copy_from_user((void *)buffer_end, buf, count)) | |
194 | return -EFAULT; | |
195 | ||
196 | buffer_end += count; | |
197 | } else { | |
198 | nbytes = data_buffer + BUFFER_SIZE - buffer_end; | |
199 | if (nbytes > count) { | |
200 | if (copy_from_user((void *)buffer_end, buf, count)) | |
201 | return -EFAULT; | |
202 | buffer_end += count; | |
203 | } else { | |
204 | if (copy_from_user((void *)buffer_end, buf, nbytes)) | |
205 | return -EFAULT; | |
206 | if (copy_from_user | |
207 | ((void *)data_buffer, buf + nbytes, count - nbytes)) | |
208 | return -EFAULT; | |
209 | buffer_end = data_buffer + count - nbytes; | |
210 | } | |
211 | } | |
212 | ||
213 | if (empty) { | |
214 | empty = 0; | |
215 | dac_audio_start_timer(); | |
216 | } | |
217 | ||
218 | return count; | |
219 | } | |
220 | ||
221 | static ssize_t dac_audio_read(struct file *file, char *buf, size_t count, | |
222 | loff_t * ppos) | |
223 | { | |
224 | return -EINVAL; | |
225 | } | |
226 | ||
227 | static int dac_audio_open(struct inode *inode, struct file *file) | |
228 | { | |
229 | if (file->f_mode & FMODE_READ) | |
230 | return -ENODEV; | |
231 | if (in_use) | |
232 | return -EBUSY; | |
233 | ||
234 | in_use = 1; | |
235 | ||
236 | dac_audio_start(); | |
237 | ||
238 | return 0; | |
239 | } | |
240 | ||
241 | static int dac_audio_release(struct inode *inode, struct file *file) | |
242 | { | |
243 | dac_audio_sync(); | |
244 | dac_audio_stop(); | |
245 | in_use = 0; | |
246 | ||
247 | return 0; | |
248 | } | |
249 | ||
250 | struct file_operations dac_audio_fops = { | |
251 | .read = dac_audio_read, | |
252 | .write = dac_audio_write, | |
253 | .ioctl = dac_audio_ioctl, | |
254 | .open = dac_audio_open, | |
255 | .release = dac_audio_release, | |
256 | }; | |
257 | ||
258 | static irqreturn_t timer1_interrupt(int irq, void *dev, struct pt_regs *regs) | |
259 | { | |
260 | unsigned long timer_status; | |
261 | ||
262 | timer_status = ctrl_inw(TMU1_TCR); | |
263 | timer_status &= ~0x100; | |
264 | ctrl_outw(timer_status, TMU1_TCR); | |
265 | ||
266 | if (!empty) { | |
267 | sh_dac_output(*buffer_begin, CONFIG_SOUND_SH_DAC_AUDIO_CHANNEL); | |
268 | buffer_begin++; | |
269 | ||
270 | if (buffer_begin == data_buffer + BUFFER_SIZE) | |
271 | buffer_begin = data_buffer; | |
272 | if (buffer_begin == buffer_end) { | |
273 | empty = 1; | |
274 | dac_audio_stop_timer(); | |
275 | } | |
276 | } | |
277 | return IRQ_HANDLED; | |
278 | } | |
279 | ||
280 | static int __init dac_audio_init(void) | |
281 | { | |
282 | int retval; | |
283 | ||
284 | if ((device_major = register_sound_dsp(&dac_audio_fops, -1)) < 0) { | |
285 | printk(KERN_ERR "Cannot register dsp device"); | |
286 | return device_major; | |
287 | } | |
288 | ||
289 | in_use = 0; | |
290 | ||
4fa95ef6 | 291 | data_buffer = kmalloc(BUFFER_SIZE, GFP_KERNEL); |
1da177e4 LT |
292 | if (data_buffer == NULL) |
293 | return -ENOMEM; | |
294 | ||
295 | dac_audio_reset(); | |
296 | rate = 8000; | |
297 | dac_audio_set_rate(); | |
298 | ||
299 | retval = | |
65ca68b3 | 300 | request_irq(TIMER1_IRQ, timer1_interrupt, IRQF_DISABLED, MODNAME, 0); |
1da177e4 LT |
301 | if (retval < 0) { |
302 | printk(KERN_ERR "sh_dac_audio: IRQ %d request failed\n", | |
303 | TIMER1_IRQ); | |
304 | return retval; | |
305 | } | |
306 | ||
307 | return 0; | |
308 | } | |
309 | ||
310 | static void __exit dac_audio_exit(void) | |
311 | { | |
312 | free_irq(TIMER1_IRQ, 0); | |
313 | ||
314 | unregister_sound_dsp(device_major); | |
315 | kfree((void *)data_buffer); | |
316 | } | |
317 | ||
318 | module_init(dac_audio_init); | |
319 | module_exit(dac_audio_exit); | |
320 | ||
321 | MODULE_AUTHOR("Andriy Skulysh, askulysh@image.kiev.ua"); | |
322 | MODULE_DESCRIPTION("SH DAC sound driver"); | |
323 | MODULE_LICENSE("GPL"); |