Merge branch 'for-jeff' of git://htj.dyndns.org/libata-tj into tejun-merge
[linux-2.6] / sound / oss / hal2.c
1 /*
2  *  Driver for A2 audio system used in SGI machines
3  *  Copyright (c) 2001, 2002, 2003 Ladislav Michl <ladis@linux-mips.org>
4  *  
5  *  Based on Ulf Carlsson's code.
6  *
7  *  This program is free software; you can redistribute it and/or modify
8  *  it under the terms of the GNU General Public License version 2 as 
9  *  published by the Free Software Foundation.
10  *
11  *  This program is distributed in the hope that it will be useful,
12  *  but WITHOUT ANY WARRANTY; without even the implied warranty of
13  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
14  *  GNU General Public License for more details.
15  *
16  *  You should have received a copy of the GNU General Public License
17  *  along with this program; if not, write to the Free Software
18  *  Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
19  *
20  *  Supported devices:
21  *  /dev/dsp    standard dsp device, (mostly) OSS compatible
22  *  /dev/mixer  standard mixer device, (mostly) OSS compatible
23  *
24  */
25 #include <linux/kernel.h>
26 #include <linux/module.h>
27 #include <linux/sched.h>
28 #include <linux/init.h>
29 #include <linux/slab.h>
30 #include <linux/poll.h>
31 #include <linux/interrupt.h>
32 #include <linux/dma-mapping.h>
33 #include <linux/sound.h>
34 #include <linux/soundcard.h>
35 #include <linux/mutex.h>
36
37
38 #include <asm/io.h>
39 #include <asm/sgi/hpc3.h>
40 #include <asm/sgi/ip22.h>
41
42 #include "hal2.h"
43
44 #if 0
45 #define DEBUG(args...)          printk(args)
46 #else
47 #define DEBUG(args...)
48 #endif
49
50 #if 0 
51 #define DEBUG_MIX(args...)      printk(args)
52 #else
53 #define DEBUG_MIX(args...)
54 #endif
55
56 /*
57  * Before touching these look how it works. It is a bit unusual I know,
58  * but it helps to keep things simple. This driver is considered complete
59  * and I won't add any new features although hardware has many cool
60  * capabilities.
61  * (Historical note: HAL2 driver was first written by Ulf Carlsson - ALSA
62  * 0.3 running with 2.2.x kernel. Then ALSA changed completely and it
63  * seemed easier to me to write OSS driver from scratch - this one. Now
64  * when ALSA is official part of 2.6 kernel it's time to write ALSA driver
65  * using (hopefully) final version of ALSA interface)
66  */
67 #define H2_BLOCK_SIZE   1024
68 #define H2_ADC_BUFSIZE  8192
69 #define H2_DAC_BUFSIZE  16834
70
71 struct hal2_pbus {
72         struct hpc3_pbus_dmacregs *pbus;
73         int pbusnr;
74         unsigned int ctrl;              /* Current state of pbus->pbdma_ctrl */
75 };
76
77 struct hal2_desc {
78         struct hpc_dma_desc desc;
79         u32 cnt;                        /* don't touch, it is also padding */
80 };
81
82 struct hal2_codec {
83         unsigned char *buffer;
84         struct hal2_desc *desc;
85         int desc_count;
86         int tail, head;                 /* tail index, head index */
87         struct hal2_pbus pbus;
88         unsigned int format;            /* Audio data format */
89         int voices;                     /* mono/stereo */
90         unsigned int sample_rate;
91         unsigned int master;            /* Master frequency */
92         unsigned short mod;             /* MOD value */
93         unsigned short inc;             /* INC value */
94
95         wait_queue_head_t dma_wait;
96         spinlock_t lock;
97         struct mutex sem;
98
99         int usecount;                   /* recording and playback are
100                                          * independent */
101 };
102
103 #define H2_MIX_OUTPUT_ATT       0
104 #define H2_MIX_INPUT_GAIN       1
105 #define H2_MIXERS               2
106 struct hal2_mixer {
107         int modcnt;
108         unsigned int master;
109         unsigned int volume[H2_MIXERS];
110 };
111
112 struct hal2_card {
113         int dev_dsp;                    /* audio device */
114         int dev_mixer;                  /* mixer device */
115         int dev_midi;                   /* midi device */
116
117         struct hal2_ctl_regs *ctl_regs; /* HAL2 ctl registers */
118         struct hal2_aes_regs *aes_regs; /* HAL2 aes registers */
119         struct hal2_vol_regs *vol_regs; /* HAL2 vol registers */
120         struct hal2_syn_regs *syn_regs; /* HAL2 syn registers */
121
122         struct hal2_codec dac;
123         struct hal2_codec adc;
124         struct hal2_mixer mixer;
125 };
126
127 #define H2_INDIRECT_WAIT(regs)  while (regs->isr & H2_ISR_TSTATUS);
128
129 #define H2_READ_ADDR(addr)      (addr | (1<<7))
130 #define H2_WRITE_ADDR(addr)     (addr)
131
132 static char *hal2str = "HAL2";
133
134 /*
135  * I doubt anyone has a machine with two HAL2 cards. It's possible to
136  * have two HPC's, so it is probably possible to have two HAL2 cards.
137  * Try to deal with it, but note that it is not tested.
138  */
139 #define MAXCARDS        2
140 static struct hal2_card* hal2_card[MAXCARDS];
141
142 static const struct {
143         unsigned char idx:4, avail:1;
144 } mixtable[SOUND_MIXER_NRDEVICES] = {
145         [SOUND_MIXER_PCM]       = { H2_MIX_OUTPUT_ATT, 1 },     /* voice */
146         [SOUND_MIXER_MIC]       = { H2_MIX_INPUT_GAIN, 1 },     /* mic */
147 };
148
149 #define H2_SUPPORTED_FORMATS    (AFMT_S16_LE | AFMT_S16_BE)
150
151 static inline void hal2_isr_write(struct hal2_card *hal2, u16 val)
152 {
153         hal2->ctl_regs->isr = val;
154 }
155
156 static inline u16 hal2_isr_look(struct hal2_card *hal2)
157 {
158         return hal2->ctl_regs->isr;
159 }
160
161 static inline u16 hal2_rev_look(struct hal2_card *hal2)
162 {
163         return hal2->ctl_regs->rev;
164 }
165
166 #ifdef HAL2_DUMP_REGS
167 static u16 hal2_i_look16(struct hal2_card *hal2, u16 addr)
168 {
169         struct hal2_ctl_regs *regs = hal2->ctl_regs;
170
171         regs->iar = H2_READ_ADDR(addr);
172         H2_INDIRECT_WAIT(regs);
173         return regs->idr0;
174 }
175 #endif
176
177 static u32 hal2_i_look32(struct hal2_card *hal2, u16 addr)
178 {
179         u32 ret;
180         struct hal2_ctl_regs *regs = hal2->ctl_regs;
181
182         regs->iar = H2_READ_ADDR(addr);
183         H2_INDIRECT_WAIT(regs);
184         ret = regs->idr0 & 0xffff;
185         regs->iar = H2_READ_ADDR(addr | 0x1);
186         H2_INDIRECT_WAIT(regs);
187         ret |= (regs->idr0 & 0xffff) << 16;
188         return ret;
189 }
190
191 static void hal2_i_write16(struct hal2_card *hal2, u16 addr, u16 val)
192 {
193         struct hal2_ctl_regs *regs = hal2->ctl_regs;
194
195         regs->idr0 = val;
196         regs->idr1 = 0;
197         regs->idr2 = 0;
198         regs->idr3 = 0;
199         regs->iar = H2_WRITE_ADDR(addr);
200         H2_INDIRECT_WAIT(regs);
201 }
202
203 static void hal2_i_write32(struct hal2_card *hal2, u16 addr, u32 val)
204 {
205         struct hal2_ctl_regs *regs = hal2->ctl_regs;
206
207         regs->idr0 = val & 0xffff;
208         regs->idr1 = val >> 16;
209         regs->idr2 = 0;
210         regs->idr3 = 0;
211         regs->iar = H2_WRITE_ADDR(addr);
212         H2_INDIRECT_WAIT(regs);
213 }
214
215 static void hal2_i_setbit16(struct hal2_card *hal2, u16 addr, u16 bit)
216 {
217         struct hal2_ctl_regs *regs = hal2->ctl_regs;
218
219         regs->iar = H2_READ_ADDR(addr);
220         H2_INDIRECT_WAIT(regs);
221         regs->idr0 = (regs->idr0 & 0xffff) | bit;
222         regs->idr1 = 0;
223         regs->idr2 = 0;
224         regs->idr3 = 0;
225         regs->iar = H2_WRITE_ADDR(addr);
226         H2_INDIRECT_WAIT(regs);
227 }
228
229 static void hal2_i_setbit32(struct hal2_card *hal2, u16 addr, u32 bit)
230 {
231         u32 tmp;
232         struct hal2_ctl_regs *regs = hal2->ctl_regs;
233
234         regs->iar = H2_READ_ADDR(addr);
235         H2_INDIRECT_WAIT(regs);
236         tmp = (regs->idr0 & 0xffff) | (regs->idr1 << 16) | bit;
237         regs->idr0 = tmp & 0xffff;
238         regs->idr1 = tmp >> 16;
239         regs->idr2 = 0;
240         regs->idr3 = 0;
241         regs->iar = H2_WRITE_ADDR(addr);
242         H2_INDIRECT_WAIT(regs);
243 }
244
245 static void hal2_i_clearbit16(struct hal2_card *hal2, u16 addr, u16 bit)
246 {
247         struct hal2_ctl_regs *regs = hal2->ctl_regs;
248
249         regs->iar = H2_READ_ADDR(addr);
250         H2_INDIRECT_WAIT(regs);
251         regs->idr0 = (regs->idr0 & 0xffff) & ~bit;
252         regs->idr1 = 0;
253         regs->idr2 = 0;
254         regs->idr3 = 0;
255         regs->iar = H2_WRITE_ADDR(addr);
256         H2_INDIRECT_WAIT(regs);
257 }
258
259 #if 0
260 static void hal2_i_clearbit32(struct hal2_card *hal2, u16 addr, u32 bit)
261 {
262         u32 tmp;
263         hal2_ctl_regs_t *regs = hal2->ctl_regs;
264
265         regs->iar = H2_READ_ADDR(addr);
266         H2_INDIRECT_WAIT(regs);
267         tmp = ((regs->idr0 & 0xffff) | (regs->idr1 << 16)) & ~bit;
268         regs->idr0 = tmp & 0xffff;
269         regs->idr1 = tmp >> 16;
270         regs->idr2 = 0;
271         regs->idr3 = 0;
272         regs->iar = H2_WRITE_ADDR(addr);
273         H2_INDIRECT_WAIT(regs);
274 }
275 #endif
276
277 #ifdef HAL2_DUMP_REGS
278 static void hal2_dump_regs(struct hal2_card *hal2)
279 {
280         DEBUG("isr: %08hx ", hal2_isr_look(hal2));
281         DEBUG("rev: %08hx\n", hal2_rev_look(hal2));
282         DEBUG("relay: %04hx\n", hal2_i_look16(hal2, H2I_RELAY_C));
283         DEBUG("port en: %04hx ", hal2_i_look16(hal2, H2I_DMA_PORT_EN));
284         DEBUG("dma end: %04hx ", hal2_i_look16(hal2, H2I_DMA_END));
285         DEBUG("dma drv: %04hx\n", hal2_i_look16(hal2, H2I_DMA_DRV));
286         DEBUG("syn ctl: %04hx ", hal2_i_look16(hal2, H2I_SYNTH_C));
287         DEBUG("aesrx ctl: %04hx ", hal2_i_look16(hal2, H2I_AESRX_C));
288         DEBUG("aestx ctl: %04hx ", hal2_i_look16(hal2, H2I_AESTX_C));
289         DEBUG("dac ctl1: %04hx ", hal2_i_look16(hal2, H2I_ADC_C1));
290         DEBUG("dac ctl2: %08x ", hal2_i_look32(hal2, H2I_ADC_C2));
291         DEBUG("adc ctl1: %04hx ", hal2_i_look16(hal2, H2I_DAC_C1));
292         DEBUG("adc ctl2: %08x ", hal2_i_look32(hal2, H2I_DAC_C2));
293         DEBUG("syn map: %04hx\n", hal2_i_look16(hal2, H2I_SYNTH_MAP_C));
294         DEBUG("bres1 ctl1: %04hx ", hal2_i_look16(hal2, H2I_BRES1_C1));
295         DEBUG("bres1 ctl2: %04x ", hal2_i_look32(hal2, H2I_BRES1_C2));
296         DEBUG("bres2 ctl1: %04hx ", hal2_i_look16(hal2, H2I_BRES2_C1));
297         DEBUG("bres2 ctl2: %04x ", hal2_i_look32(hal2, H2I_BRES2_C2));
298         DEBUG("bres3 ctl1: %04hx ", hal2_i_look16(hal2, H2I_BRES3_C1));
299         DEBUG("bres3 ctl2: %04x\n", hal2_i_look32(hal2, H2I_BRES3_C2));
300 }
301 #endif
302
303 static struct hal2_card* hal2_dsp_find_card(int minor)
304 {
305         int i;
306
307         for (i = 0; i < MAXCARDS; i++)
308                 if (hal2_card[i] != NULL && hal2_card[i]->dev_dsp == minor)
309                         return hal2_card[i];
310         return NULL;
311 }
312
313 static struct hal2_card* hal2_mixer_find_card(int minor)
314 {
315         int i;
316
317         for (i = 0; i < MAXCARDS; i++)
318                 if (hal2_card[i] != NULL && hal2_card[i]->dev_mixer == minor)
319                         return hal2_card[i];
320         return NULL;
321 }
322
323 static void hal2_inc_head(struct hal2_codec *codec)
324 {
325         codec->head++;
326         if (codec->head == codec->desc_count)
327                 codec->head = 0;
328 }
329
330 static void hal2_inc_tail(struct hal2_codec *codec)
331 {
332         codec->tail++;
333         if (codec->tail == codec->desc_count)
334                 codec->tail = 0;
335 }
336
337 static void hal2_dac_interrupt(struct hal2_codec *dac)
338 {
339         int running;
340
341         spin_lock(&dac->lock);
342         /* if tail buffer contains zero samples DMA stream was already
343          * stopped */
344         running = dac->desc[dac->tail].cnt;
345         dac->desc[dac->tail].cnt = 0;
346         dac->desc[dac->tail].desc.cntinfo = HPCDMA_XIE | HPCDMA_EOX;
347         /* we just proccessed empty buffer, don't update tail pointer */
348         if (running)
349                 hal2_inc_tail(dac);
350         spin_unlock(&dac->lock);
351
352         wake_up(&dac->dma_wait);
353 }
354
355 static void hal2_adc_interrupt(struct hal2_codec *adc)
356 {
357         int running;
358
359         spin_lock(&adc->lock);
360         /* if head buffer contains nonzero samples DMA stream was already
361          * stopped */
362         running = !adc->desc[adc->head].cnt;
363         adc->desc[adc->head].cnt = H2_BLOCK_SIZE;
364         adc->desc[adc->head].desc.cntinfo = HPCDMA_XIE | HPCDMA_EOR;
365         /* we just proccessed empty buffer, don't update head pointer */
366         if (running)
367                 hal2_inc_head(adc);
368         spin_unlock(&adc->lock);
369
370         wake_up(&adc->dma_wait);
371 }
372
373 static irqreturn_t hal2_interrupt(int irq, void *dev_id, struct pt_regs *regs)
374 {
375         struct hal2_card *hal2 = (struct hal2_card*)dev_id;
376         irqreturn_t ret = IRQ_NONE;
377
378         /* decide what caused this interrupt */
379         if (hal2->dac.pbus.pbus->pbdma_ctrl & HPC3_PDMACTRL_INT) {
380                 hal2_dac_interrupt(&hal2->dac);
381                 ret = IRQ_HANDLED;
382         }
383         if (hal2->adc.pbus.pbus->pbdma_ctrl & HPC3_PDMACTRL_INT) {
384                 hal2_adc_interrupt(&hal2->adc);
385                 ret = IRQ_HANDLED;
386         }
387         return ret;
388 }
389
390 static int hal2_compute_rate(struct hal2_codec *codec, unsigned int rate)
391 {
392         unsigned short mod;
393         
394         DEBUG("rate: %d\n", rate);
395         
396         if (rate < 4000) rate = 4000;
397         else if (rate > 48000) rate = 48000;
398
399         if (44100 % rate < 48000 % rate) {
400                 mod = 4 * 44100 / rate;
401                 codec->master = 44100;
402         } else {
403                 mod = 4 * 48000 / rate;
404                 codec->master = 48000;
405         }
406
407         codec->inc = 4;
408         codec->mod = mod;
409         rate = 4 * codec->master / mod;
410
411         DEBUG("real_rate: %d\n", rate);
412
413         return rate;
414 }
415
416 static void hal2_set_dac_rate(struct hal2_card *hal2)
417 {
418         unsigned int master = hal2->dac.master;
419         int inc = hal2->dac.inc;
420         int mod = hal2->dac.mod;
421
422         DEBUG("master: %d inc: %d mod: %d\n", master, inc, mod);
423         
424         hal2_i_write16(hal2, H2I_BRES1_C1, (master == 44100) ? 1 : 0);
425         hal2_i_write32(hal2, H2I_BRES1_C2, ((0xffff & (inc - mod - 1)) << 16) | inc);
426 }
427
428 static void hal2_set_adc_rate(struct hal2_card *hal2)
429 {
430         unsigned int master = hal2->adc.master;
431         int inc = hal2->adc.inc;
432         int mod = hal2->adc.mod;
433
434         DEBUG("master: %d inc: %d mod: %d\n", master, inc, mod);
435         
436         hal2_i_write16(hal2, H2I_BRES2_C1, (master == 44100) ? 1 : 0);
437         hal2_i_write32(hal2, H2I_BRES2_C2, ((0xffff & (inc - mod - 1)) << 16) | inc);
438 }
439
440 static void hal2_setup_dac(struct hal2_card *hal2)
441 {
442         unsigned int fifobeg, fifoend, highwater, sample_size;
443         struct hal2_pbus *pbus = &hal2->dac.pbus;
444
445         DEBUG("hal2_setup_dac\n");
446         
447         /* Now we set up some PBUS information. The PBUS needs information about
448          * what portion of the fifo it will use. If it's receiving or
449          * transmitting, and finally whether the stream is little endian or big
450          * endian. The information is written later, on the start call.
451          */
452         sample_size = 2 * hal2->dac.voices;
453         /* Fifo should be set to hold exactly four samples. Highwater mark
454          * should be set to two samples. */
455         highwater = (sample_size * 2) >> 1;     /* halfwords */
456         fifobeg = 0;                            /* playback is first */
457         fifoend = (sample_size * 4) >> 3;       /* doublewords */
458         pbus->ctrl = HPC3_PDMACTRL_RT | HPC3_PDMACTRL_LD |
459                      (highwater << 8) | (fifobeg << 16) | (fifoend << 24) |
460                      (hal2->dac.format & AFMT_S16_LE ? HPC3_PDMACTRL_SEL : 0);
461         /* We disable everything before we do anything at all */
462         pbus->pbus->pbdma_ctrl = HPC3_PDMACTRL_LD;
463         hal2_i_clearbit16(hal2, H2I_DMA_PORT_EN, H2I_DMA_PORT_EN_CODECTX);
464         /* Setup the HAL2 for playback */
465         hal2_set_dac_rate(hal2);
466         /* Set endianess */
467         if (hal2->dac.format & AFMT_S16_LE)
468                 hal2_i_setbit16(hal2, H2I_DMA_END, H2I_DMA_END_CODECTX);
469         else
470                 hal2_i_clearbit16(hal2, H2I_DMA_END, H2I_DMA_END_CODECTX);
471         /* Set DMA bus */
472         hal2_i_setbit16(hal2, H2I_DMA_DRV, (1 << pbus->pbusnr));
473         /* We are using 1st Bresenham clock generator for playback */
474         hal2_i_write16(hal2, H2I_DAC_C1, (pbus->pbusnr << H2I_C1_DMA_SHIFT)
475                         | (1 << H2I_C1_CLKID_SHIFT)
476                         | (hal2->dac.voices << H2I_C1_DATAT_SHIFT));
477 }
478
479 static void hal2_setup_adc(struct hal2_card *hal2)
480 {
481         unsigned int fifobeg, fifoend, highwater, sample_size;
482         struct hal2_pbus *pbus = &hal2->adc.pbus;
483
484         DEBUG("hal2_setup_adc\n");
485
486         sample_size = 2 * hal2->adc.voices;
487         highwater = (sample_size * 2) >> 1;             /* halfwords */
488         fifobeg = (4 * 4) >> 3;                         /* record is second */
489         fifoend = (4 * 4 + sample_size * 4) >> 3;       /* doublewords */
490         pbus->ctrl = HPC3_PDMACTRL_RT | HPC3_PDMACTRL_RCV | HPC3_PDMACTRL_LD | 
491                      (highwater << 8) | (fifobeg << 16) | (fifoend << 24) |
492                      (hal2->adc.format & AFMT_S16_LE ? HPC3_PDMACTRL_SEL : 0);
493         pbus->pbus->pbdma_ctrl = HPC3_PDMACTRL_LD;
494         hal2_i_clearbit16(hal2, H2I_DMA_PORT_EN, H2I_DMA_PORT_EN_CODECR);
495         /* Setup the HAL2 for record */
496         hal2_set_adc_rate(hal2);
497         /* Set endianess */
498         if (hal2->adc.format & AFMT_S16_LE)
499                 hal2_i_setbit16(hal2, H2I_DMA_END, H2I_DMA_END_CODECR);
500         else
501                 hal2_i_clearbit16(hal2, H2I_DMA_END, H2I_DMA_END_CODECR);
502         /* Set DMA bus */
503         hal2_i_setbit16(hal2, H2I_DMA_DRV, (1 << pbus->pbusnr));
504         /* We are using 2nd Bresenham clock generator for record */
505         hal2_i_write16(hal2, H2I_ADC_C1, (pbus->pbusnr << H2I_C1_DMA_SHIFT)
506                         | (2 << H2I_C1_CLKID_SHIFT)
507                         | (hal2->adc.voices << H2I_C1_DATAT_SHIFT));
508 }
509
510 static dma_addr_t hal2_desc_addr(struct hal2_codec *codec, int i)
511 {
512         if (--i < 0)
513                 i = codec->desc_count - 1;
514         return codec->desc[i].desc.pnext;
515 }
516
517 static void hal2_start_dac(struct hal2_card *hal2)
518 {
519         struct hal2_codec *dac = &hal2->dac;
520         struct hal2_pbus *pbus = &dac->pbus;
521
522         pbus->pbus->pbdma_dptr = hal2_desc_addr(dac, dac->tail);
523         pbus->pbus->pbdma_ctrl = pbus->ctrl | HPC3_PDMACTRL_ACT;
524         /* enable DAC */
525         hal2_i_setbit16(hal2, H2I_DMA_PORT_EN, H2I_DMA_PORT_EN_CODECTX);
526 }
527
528 static void hal2_start_adc(struct hal2_card *hal2)
529 {
530         struct hal2_codec *adc = &hal2->adc;
531         struct hal2_pbus *pbus = &adc->pbus;
532
533         pbus->pbus->pbdma_dptr = hal2_desc_addr(adc, adc->head);
534         pbus->pbus->pbdma_ctrl = pbus->ctrl | HPC3_PDMACTRL_ACT;
535         /* enable ADC */
536         hal2_i_setbit16(hal2, H2I_DMA_PORT_EN, H2I_DMA_PORT_EN_CODECR);
537 }
538
539 static inline void hal2_stop_dac(struct hal2_card *hal2)
540 {
541         hal2->dac.pbus.pbus->pbdma_ctrl = HPC3_PDMACTRL_LD;
542         /* The HAL2 itself may remain enabled safely */
543 }
544
545 static inline void hal2_stop_adc(struct hal2_card *hal2)
546 {
547         hal2->adc.pbus.pbus->pbdma_ctrl = HPC3_PDMACTRL_LD;
548 }
549
550 static int hal2_alloc_dmabuf(struct hal2_codec *codec, int size,
551                              int count, int cntinfo, int dir)
552 {
553         struct hal2_desc *desc, *dma_addr;
554         int i;
555
556         DEBUG("allocating %dk DMA buffer.\n", size / 1024);
557
558         codec->buffer = (unsigned char *)__get_free_pages(GFP_KERNEL | GFP_DMA,
559                                                           get_order(size));
560         if (!codec->buffer)
561                 return -ENOMEM;
562         desc = dma_alloc_coherent(NULL, count * sizeof(struct hal2_desc),
563                                   (dma_addr_t *)&dma_addr, GFP_KERNEL);
564         if (!desc) {
565                 free_pages((unsigned long)codec->buffer, get_order(size));
566                 return -ENOMEM;
567         }
568         codec->desc = desc;
569         for (i = 0; i < count; i++) {
570                 desc->desc.pbuf = dma_map_single(NULL,
571                         (void *)(codec->buffer + i * H2_BLOCK_SIZE),
572                         H2_BLOCK_SIZE, dir);
573                 desc->desc.cntinfo = cntinfo;
574                 desc->desc.pnext = (i == count - 1) ?
575                                    (u32)dma_addr : (u32)(dma_addr + i + 1);
576                 desc->cnt = 0;
577                 desc++;
578         }
579         codec->desc_count = count;
580         codec->head = codec->tail = 0;
581         return 0;
582 }
583
584 static int hal2_alloc_dac_dmabuf(struct hal2_codec *codec)
585 {
586         return hal2_alloc_dmabuf(codec, H2_DAC_BUFSIZE,
587                                  H2_DAC_BUFSIZE / H2_BLOCK_SIZE,
588                                  HPCDMA_XIE | HPCDMA_EOX,
589                                  DMA_TO_DEVICE);
590 }
591
592 static int hal2_alloc_adc_dmabuf(struct hal2_codec *codec)
593 {
594         return hal2_alloc_dmabuf(codec, H2_ADC_BUFSIZE,
595                                  H2_ADC_BUFSIZE / H2_BLOCK_SIZE,
596                                  HPCDMA_XIE | H2_BLOCK_SIZE,
597                                  DMA_TO_DEVICE);
598 }
599
600 static void hal2_free_dmabuf(struct hal2_codec *codec, int size, int dir)
601 {
602         dma_addr_t dma_addr;
603         int i;
604
605         dma_addr = codec->desc[codec->desc_count - 1].desc.pnext;
606         for (i = 0; i < codec->desc_count; i++)
607                 dma_unmap_single(NULL, codec->desc[i].desc.pbuf,
608                                  H2_BLOCK_SIZE, dir);
609         dma_free_coherent(NULL, codec->desc_count * sizeof(struct hal2_desc),
610                           (void *)codec->desc, dma_addr);
611         free_pages((unsigned long)codec->buffer, get_order(size));
612 }
613
614 static void hal2_free_dac_dmabuf(struct hal2_codec *codec)
615 {
616         return hal2_free_dmabuf(codec, H2_DAC_BUFSIZE, DMA_TO_DEVICE);
617 }
618
619 static void hal2_free_adc_dmabuf(struct hal2_codec *codec)
620 {
621         return hal2_free_dmabuf(codec, H2_ADC_BUFSIZE, DMA_FROM_DEVICE);
622 }
623
624 /* 
625  * Add 'count' bytes to 'buffer' from DMA ring buffers. Return number of
626  * bytes added or -EFAULT if copy_from_user failed.
627  */
628 static int hal2_get_buffer(struct hal2_card *hal2, char *buffer, int count)
629 {
630         unsigned long flags;
631         int size, ret = 0;
632         unsigned char *buf;
633         struct hal2_desc *tail;
634         struct hal2_codec *adc = &hal2->adc;
635
636         DEBUG("getting %d bytes ", count);
637
638         spin_lock_irqsave(&adc->lock, flags);
639         tail = &adc->desc[adc->tail];
640         /* enable DMA stream if there are no data */
641         if (!tail->cnt && !(adc->pbus.pbus->pbdma_ctrl & HPC3_PDMACTRL_ISACT))
642                 hal2_start_adc(hal2);
643         while (tail->cnt > 0 && count > 0) {
644                 size = min((int)tail->cnt, count);
645                 buf = &adc->buffer[(adc->tail + 1) * H2_BLOCK_SIZE - tail->cnt];
646                 spin_unlock_irqrestore(&adc->lock, flags);
647                 dma_sync_single(NULL, tail->desc.pbuf, size, DMA_FROM_DEVICE);
648                 if (copy_to_user(buffer, buf, size)) {
649                         ret = -EFAULT;
650                         goto out;
651                 }
652                 spin_lock_irqsave(&adc->lock, flags);
653                 tail->cnt -= size;
654                 /* buffer is empty, update tail pointer */
655                 if (tail->cnt == 0) {
656                         tail->desc.cntinfo = HPCDMA_XIE | H2_BLOCK_SIZE;
657                         hal2_inc_tail(adc);
658                         tail = &adc->desc[adc->tail];
659                         /* enable DMA stream again if needed */
660                         if (!(adc->pbus.pbus->pbdma_ctrl & HPC3_PDMACTRL_ISACT))
661                                 hal2_start_adc(hal2);
662                 }
663                 buffer += size;
664                 ret += size;
665                 count -= size;
666
667                 DEBUG("(%d) ", size);
668         }
669         spin_unlock_irqrestore(&adc->lock, flags);
670 out:
671         DEBUG("\n");
672
673         return ret;
674
675
676 /* 
677  * Add 'count' bytes from 'buffer' to DMA ring buffers. Return number of
678  * bytes added or -EFAULT if copy_from_user failed.
679  */
680 static int hal2_add_buffer(struct hal2_card *hal2, char *buffer, int count)
681 {
682         unsigned long flags;
683         unsigned char *buf;
684         int size, ret = 0;
685         struct hal2_desc *head;
686         struct hal2_codec *dac = &hal2->dac;
687
688         DEBUG("adding %d bytes ", count);
689
690         spin_lock_irqsave(&dac->lock, flags);
691         head = &dac->desc[dac->head];
692         while (head->cnt == 0 && count > 0) {
693                 size = min((int)H2_BLOCK_SIZE, count);
694                 buf = &dac->buffer[dac->head * H2_BLOCK_SIZE];
695                 spin_unlock_irqrestore(&dac->lock, flags);
696                 if (copy_from_user(buf, buffer, size)) {
697                         ret = -EFAULT;
698                         goto out;
699                 }
700                 dma_sync_single(NULL, head->desc.pbuf, size, DMA_TO_DEVICE);
701                 spin_lock_irqsave(&dac->lock, flags);
702                 head->desc.cntinfo = size | HPCDMA_XIE;
703                 head->cnt = size;
704                 buffer += size;
705                 ret += size;
706                 count -= size;
707                 hal2_inc_head(dac);
708                 head = &dac->desc[dac->head];
709
710                 DEBUG("(%d) ", size);
711         }
712         if (!(dac->pbus.pbus->pbdma_ctrl & HPC3_PDMACTRL_ISACT) && ret > 0)
713                 hal2_start_dac(hal2);
714         spin_unlock_irqrestore(&dac->lock, flags);
715 out:
716         DEBUG("\n");
717
718         return ret;
719 }
720
721 #define hal2_reset_dac_pointer(hal2)    hal2_reset_pointer(hal2, 1)
722 #define hal2_reset_adc_pointer(hal2)    hal2_reset_pointer(hal2, 0)
723 static void hal2_reset_pointer(struct hal2_card *hal2, int is_dac)
724 {
725         int i;
726         struct hal2_codec *codec = (is_dac) ? &hal2->dac : &hal2->adc;
727
728         DEBUG("hal2_reset_pointer\n");
729
730         for (i = 0; i < codec->desc_count; i++) {
731                 codec->desc[i].cnt = 0;
732                 codec->desc[i].desc.cntinfo = HPCDMA_XIE | (is_dac) ?
733                                               HPCDMA_EOX : H2_BLOCK_SIZE;
734         }
735         codec->head = codec->tail = 0;
736 }
737
738 static int hal2_sync_dac(struct hal2_card *hal2)
739 {
740         DECLARE_WAITQUEUE(wait, current);
741         struct hal2_codec *dac = &hal2->dac;
742         int ret = 0;
743         unsigned long flags;
744         signed long timeout = 1000 * H2_BLOCK_SIZE * 2 * dac->voices *
745                               HZ / dac->sample_rate / 900;
746
747         while (dac->pbus.pbus->pbdma_ctrl & HPC3_PDMACTRL_ISACT) {
748                 add_wait_queue(&dac->dma_wait, &wait);
749                 set_current_state(TASK_INTERRUPTIBLE);
750                 schedule_timeout(timeout);
751                 spin_lock_irqsave(&dac->lock, flags);
752                 if (dac->desc[dac->tail].cnt)
753                         ret = -ETIME;
754                 spin_unlock_irqrestore(&dac->lock, flags);
755                 if (signal_pending(current))
756                         ret = -ERESTARTSYS;
757                 if (ret) {
758                         hal2_stop_dac(hal2);
759                         hal2_reset_dac_pointer(hal2);
760                 }
761                 remove_wait_queue(&dac->dma_wait, &wait);
762         }
763
764         return ret;
765 }
766
767 static int hal2_write_mixer(struct hal2_card *hal2, int index, int vol)
768 {
769         unsigned int l, r, tmp;
770
771         DEBUG_MIX("mixer %d write\n", index);
772
773         if (index >= SOUND_MIXER_NRDEVICES || !mixtable[index].avail)
774                 return -EINVAL;
775
776         r = (vol >> 8) & 0xff;
777         if (r > 100)
778                 r = 100;
779         l = vol & 0xff;
780         if (l > 100)
781                 l = 100;
782
783         hal2->mixer.volume[mixtable[index].idx] = l | (r << 8);
784
785         switch (mixtable[index].idx) {
786         case H2_MIX_OUTPUT_ATT:
787
788                 DEBUG_MIX("output attenuator %d,%d\n", l, r);
789
790                 if (r | l) {
791                         tmp = hal2_i_look32(hal2, H2I_DAC_C2);
792                         tmp &= ~(H2I_C2_L_ATT_M | H2I_C2_R_ATT_M | H2I_C2_MUTE);
793
794                         /* Attenuator has five bits */
795                         l = 31 * (100 - l) / 99;
796                         r = 31 * (100 - r) / 99;
797
798                         DEBUG_MIX("left: %d, right %d\n", l, r);
799
800                         tmp |= (l << H2I_C2_L_ATT_SHIFT) & H2I_C2_L_ATT_M;
801                         tmp |= (r << H2I_C2_R_ATT_SHIFT) & H2I_C2_R_ATT_M;
802                         hal2_i_write32(hal2, H2I_DAC_C2, tmp);
803                 } else 
804                         hal2_i_setbit32(hal2, H2I_DAC_C2, H2I_C2_MUTE);
805                 break;
806         case H2_MIX_INPUT_GAIN:
807
808                 DEBUG_MIX("input gain %d,%d\n", l, r);
809
810                 tmp = hal2_i_look32(hal2, H2I_ADC_C2);
811                 tmp &= ~(H2I_C2_L_GAIN_M | H2I_C2_R_GAIN_M);
812
813                 /* Gain control has four bits */
814                 l = 16 * l / 100;
815                 r = 16 * r / 100;
816
817                 DEBUG_MIX("left: %d, right %d\n", l, r);
818
819                 tmp |= (l << H2I_C2_L_GAIN_SHIFT) & H2I_C2_L_GAIN_M;
820                 tmp |= (r << H2I_C2_R_GAIN_SHIFT) & H2I_C2_R_GAIN_M;
821                 hal2_i_write32(hal2, H2I_ADC_C2, tmp);
822
823                 break;
824         }
825
826         return 0;
827 }
828
829 static void hal2_init_mixer(struct hal2_card *hal2)
830 {
831         int i;
832
833         for (i = 0; i < SOUND_MIXER_NRDEVICES; i++)
834                 if (mixtable[i].avail)
835                         hal2->mixer.volume[mixtable[i].idx] = 100 | (100 << 8);
836
837         /* disable attenuator */
838         hal2_i_write32(hal2, H2I_DAC_C2, 0);
839         /* set max input gain */
840         hal2_i_write32(hal2, H2I_ADC_C2, H2I_C2_MUTE |
841                         (H2I_C2_L_GAIN_M << H2I_C2_L_GAIN_SHIFT) |
842                         (H2I_C2_R_GAIN_M << H2I_C2_R_GAIN_SHIFT));
843         /* set max volume */
844         hal2->mixer.master = 0xff;
845         hal2->vol_regs->left = 0xff;
846         hal2->vol_regs->right = 0xff;
847 }
848
849 /*
850  * XXX: later i'll implement mixer for main volume which will be disabled
851  * by default. enabling it users will be allowed to have master volume level
852  * control on panel in their favourite X desktop
853  */
854 static void hal2_volume_control(int direction)
855 {
856         unsigned int master = hal2_card[0]->mixer.master;
857         struct hal2_vol_regs *vol = hal2_card[0]->vol_regs;
858
859         /* volume up */
860         if (direction > 0 && master < 0xff)
861                 master++;
862         /* volume down */
863         else if (direction < 0 && master > 0)
864                 master--;
865         /* TODO: mute/unmute */
866         vol->left = master;
867         vol->right = master;
868         hal2_card[0]->mixer.master = master;
869 }
870
871 static int hal2_mixer_ioctl(struct hal2_card *hal2, unsigned int cmd,
872                             unsigned long arg)
873 {
874         int val;
875
876         if (cmd == SOUND_MIXER_INFO) {
877                 mixer_info info;
878
879                 memset(&info, 0, sizeof(info));
880                 strlcpy(info.id, hal2str, sizeof(info.id));
881                 strlcpy(info.name, hal2str, sizeof(info.name));
882                 info.modify_counter = hal2->mixer.modcnt;
883                 if (copy_to_user((void *)arg, &info, sizeof(info)))
884                         return -EFAULT;
885                 return 0;
886         }
887         if (cmd == SOUND_OLD_MIXER_INFO) {
888                 _old_mixer_info info;
889
890                 memset(&info, 0, sizeof(info));
891                 strlcpy(info.id, hal2str, sizeof(info.id));
892                 strlcpy(info.name, hal2str, sizeof(info.name));
893                 if (copy_to_user((void *)arg, &info, sizeof(info)))
894                         return -EFAULT;
895                 return 0;
896         }
897         if (cmd == OSS_GETVERSION)
898                 return put_user(SOUND_VERSION, (int *)arg);
899
900         if (_IOC_TYPE(cmd) != 'M' || _IOC_SIZE(cmd) != sizeof(int))
901                 return -EINVAL;
902
903         if (_IOC_DIR(cmd) == _IOC_READ) {
904                 switch (_IOC_NR(cmd)) {
905                 /* Give the current record source */
906                 case SOUND_MIXER_RECSRC:
907                         val = 0;        /* FIXME */
908                         break;
909                 /* Give the supported mixers, all of them support stereo */
910                 case SOUND_MIXER_DEVMASK:
911                 case SOUND_MIXER_STEREODEVS: {
912                         int i;
913
914                         for (val = i = 0; i < SOUND_MIXER_NRDEVICES; i++)
915                                 if (mixtable[i].avail)
916                                         val |= 1 << i;
917                         break;
918                         }
919                 /* Arg contains a bit for each supported recording source */
920                 case SOUND_MIXER_RECMASK:
921                         val = 0;
922                         break;
923                 case SOUND_MIXER_CAPS:
924                         val = 0;
925                         break;
926                 /* Read a specific mixer */
927                 default: {
928                         int i = _IOC_NR(cmd);
929
930                         if (i >= SOUND_MIXER_NRDEVICES || !mixtable[i].avail)
931                                 return -EINVAL;
932                         val = hal2->mixer.volume[mixtable[i].idx];
933                         break;
934                         }
935                 }
936                 return put_user(val, (int *)arg);
937         }
938
939         if (_IOC_DIR(cmd) != (_IOC_WRITE|_IOC_READ))
940                 return -EINVAL;
941
942         hal2->mixer.modcnt++;
943
944         if (get_user(val, (int *)arg))
945                 return -EFAULT;
946
947         switch (_IOC_NR(cmd)) {
948         /* Arg contains a bit for each recording source */
949         case SOUND_MIXER_RECSRC:
950                 return 0;       /* FIXME */
951         default:
952                 return hal2_write_mixer(hal2, _IOC_NR(cmd), val);
953         }
954
955         return 0;
956 }
957
958 static int hal2_open_mixdev(struct inode *inode, struct file *file)
959 {
960         struct hal2_card *hal2 = hal2_mixer_find_card(iminor(inode));
961
962         if (hal2) {
963                 file->private_data = hal2;
964                 return nonseekable_open(inode, file);
965         }
966         return -ENODEV;
967 }
968
969 static int hal2_release_mixdev(struct inode *inode, struct file *file)
970 {
971         return 0;
972 }
973
974 static int hal2_ioctl_mixdev(struct inode *inode, struct file *file,
975                              unsigned int cmd, unsigned long arg)
976 {
977         return hal2_mixer_ioctl((struct hal2_card *)file->private_data, cmd, arg);
978 }
979
980 static int hal2_ioctl(struct inode *inode, struct file *file, 
981                       unsigned int cmd, unsigned long arg)
982 {
983         int val;
984         struct hal2_card *hal2 = (struct hal2_card *) file->private_data;
985
986         switch (cmd) {
987         case OSS_GETVERSION:
988                 return put_user(SOUND_VERSION, (int *)arg);
989
990         case SNDCTL_DSP_SYNC:
991                 if (file->f_mode & FMODE_WRITE)
992                         return hal2_sync_dac(hal2);
993                 return 0;
994
995         case SNDCTL_DSP_SETDUPLEX:
996                 return 0;
997
998         case SNDCTL_DSP_GETCAPS:
999                 return put_user(DSP_CAP_DUPLEX | DSP_CAP_MULTI, (int *)arg);
1000
1001         case SNDCTL_DSP_RESET:
1002                 if (file->f_mode & FMODE_READ) {
1003                         hal2_stop_adc(hal2);
1004                         hal2_reset_adc_pointer(hal2);
1005                 }
1006                 if (file->f_mode & FMODE_WRITE) {
1007                         hal2_stop_dac(hal2);
1008                         hal2_reset_dac_pointer(hal2);
1009                 }
1010                 return 0;
1011
1012         case SNDCTL_DSP_SPEED:
1013                 if (get_user(val, (int *)arg))
1014                         return -EFAULT;
1015                 if (file->f_mode & FMODE_READ) {
1016                         hal2_stop_adc(hal2);
1017                         val = hal2_compute_rate(&hal2->adc, val);
1018                         hal2->adc.sample_rate = val;
1019                         hal2_set_adc_rate(hal2);
1020                 }
1021                 if (file->f_mode & FMODE_WRITE) {
1022                         hal2_stop_dac(hal2);
1023                         val = hal2_compute_rate(&hal2->dac, val);
1024                         hal2->dac.sample_rate = val;
1025                         hal2_set_dac_rate(hal2);
1026                 }
1027                 return put_user(val, (int *)arg);
1028
1029         case SNDCTL_DSP_STEREO:
1030                 if (get_user(val, (int *)arg))
1031                         return -EFAULT;
1032                 if (file->f_mode & FMODE_READ) {
1033                         hal2_stop_adc(hal2);
1034                         hal2->adc.voices = (val) ? 2 : 1;
1035                         hal2_setup_adc(hal2);
1036                 }
1037                 if (file->f_mode & FMODE_WRITE) {
1038                         hal2_stop_dac(hal2);
1039                         hal2->dac.voices = (val) ? 2 : 1;
1040                         hal2_setup_dac(hal2);
1041                 }
1042                 return 0;
1043
1044         case SNDCTL_DSP_CHANNELS:
1045                 if (get_user(val, (int *)arg))
1046                         return -EFAULT;
1047                 if (val != 0) {
1048                         if (file->f_mode & FMODE_READ) {
1049                                 hal2_stop_adc(hal2);
1050                                 hal2->adc.voices = (val == 1) ? 1 : 2;
1051                                 hal2_setup_adc(hal2);
1052                         }
1053                         if (file->f_mode & FMODE_WRITE) {
1054                                 hal2_stop_dac(hal2);
1055                                 hal2->dac.voices = (val == 1) ? 1 : 2;
1056                                 hal2_setup_dac(hal2);
1057                         }
1058                 }
1059                 val = -EINVAL;
1060                 if (file->f_mode & FMODE_READ)
1061                         val = hal2->adc.voices;
1062                 if (file->f_mode & FMODE_WRITE)
1063                         val = hal2->dac.voices;
1064                 return put_user(val, (int *)arg);
1065
1066         case SNDCTL_DSP_GETFMTS: /* Returns a mask */
1067                 return put_user(H2_SUPPORTED_FORMATS, (int *)arg);
1068
1069         case SNDCTL_DSP_SETFMT: /* Selects ONE fmt*/
1070                 if (get_user(val, (int *)arg))
1071                         return -EFAULT;
1072                 if (val != AFMT_QUERY) {
1073                         if (!(val & H2_SUPPORTED_FORMATS))
1074                                 return -EINVAL;
1075                         if (file->f_mode & FMODE_READ) {
1076                                 hal2_stop_adc(hal2);
1077                                 hal2->adc.format = val;
1078                                 hal2_setup_adc(hal2);
1079                         }
1080                         if (file->f_mode & FMODE_WRITE) {
1081                                 hal2_stop_dac(hal2);
1082                                 hal2->dac.format = val;
1083                                 hal2_setup_dac(hal2);
1084                         }
1085                 } else {
1086                         val = -EINVAL;
1087                         if (file->f_mode & FMODE_READ)
1088                                 val = hal2->adc.format;
1089                         if (file->f_mode & FMODE_WRITE)
1090                                 val = hal2->dac.format;
1091                 }
1092                 return put_user(val, (int *)arg);
1093
1094         case SNDCTL_DSP_POST:
1095                 return 0;
1096
1097         case SNDCTL_DSP_GETOSPACE: {
1098                 audio_buf_info info;
1099                 int i;
1100                 unsigned long flags;
1101                 struct hal2_codec *dac = &hal2->dac;
1102
1103                 if (!(file->f_mode & FMODE_WRITE))
1104                         return -EINVAL;
1105                 info.fragments = 0;
1106                 spin_lock_irqsave(&dac->lock, flags);
1107                 for (i = 0; i < dac->desc_count; i++)
1108                         if (dac->desc[i].cnt == 0)
1109                                 info.fragments++;
1110                 spin_unlock_irqrestore(&dac->lock, flags);
1111                 info.fragstotal = dac->desc_count;
1112                 info.fragsize = H2_BLOCK_SIZE;
1113                 info.bytes = info.fragsize * info.fragments;
1114
1115                 return copy_to_user((void *)arg, &info, sizeof(info)) ? -EFAULT : 0;
1116         }
1117
1118         case SNDCTL_DSP_GETISPACE: {
1119                 audio_buf_info info;
1120                 int i;
1121                 unsigned long flags;
1122                 struct hal2_codec *adc = &hal2->adc;
1123
1124                 if (!(file->f_mode & FMODE_READ))
1125                         return -EINVAL;
1126                 info.fragments = 0;
1127                 info.bytes = 0;
1128                 spin_lock_irqsave(&adc->lock, flags);
1129                 for (i = 0; i < adc->desc_count; i++)
1130                         if (adc->desc[i].cnt > 0) {
1131                                 info.fragments++;
1132                                 info.bytes += adc->desc[i].cnt;
1133                         }
1134                 spin_unlock_irqrestore(&adc->lock, flags);
1135                 info.fragstotal = adc->desc_count;
1136                 info.fragsize = H2_BLOCK_SIZE;
1137
1138                 return copy_to_user((void *)arg, &info, sizeof(info)) ? -EFAULT : 0;
1139         }
1140
1141         case SNDCTL_DSP_NONBLOCK:
1142                 file->f_flags |= O_NONBLOCK;
1143                 return 0;
1144
1145         case SNDCTL_DSP_GETBLKSIZE:
1146                 return put_user(H2_BLOCK_SIZE, (int *)arg);
1147
1148         case SNDCTL_DSP_SETFRAGMENT:
1149                 return 0;
1150
1151         case SOUND_PCM_READ_RATE:
1152                 val = -EINVAL;
1153                 if (file->f_mode & FMODE_READ)
1154                         val = hal2->adc.sample_rate;
1155                 if (file->f_mode & FMODE_WRITE)
1156                         val = hal2->dac.sample_rate;
1157                 return put_user(val, (int *)arg);
1158
1159         case SOUND_PCM_READ_CHANNELS:
1160                 val = -EINVAL;
1161                 if (file->f_mode & FMODE_READ)
1162                         val = hal2->adc.voices;
1163                 if (file->f_mode & FMODE_WRITE)
1164                         val = hal2->dac.voices;
1165                 return put_user(val, (int *)arg);
1166
1167         case SOUND_PCM_READ_BITS:
1168                 return put_user(16, (int *)arg);
1169         }
1170
1171         return hal2_mixer_ioctl(hal2, cmd, arg);
1172 }
1173
1174 static ssize_t hal2_read(struct file *file, char *buffer,
1175                          size_t count, loff_t *ppos)
1176 {
1177         ssize_t err;
1178         struct hal2_card *hal2 = (struct hal2_card *) file->private_data;
1179         struct hal2_codec *adc = &hal2->adc;
1180
1181         if (!count)
1182                 return 0;
1183         if (mutex_lock_interruptible(&adc->sem))
1184                 return -EINTR;
1185         if (file->f_flags & O_NONBLOCK) {
1186                 err = hal2_get_buffer(hal2, buffer, count);
1187                 err = err == 0 ? -EAGAIN : err;
1188         } else {
1189                 do {
1190                         /* ~10% longer */
1191                         signed long timeout = 1000 * H2_BLOCK_SIZE *
1192                                 2 * adc->voices * HZ / adc->sample_rate / 900;
1193                         unsigned long flags;
1194                         DECLARE_WAITQUEUE(wait, current);
1195                         ssize_t cnt = 0;
1196
1197                         err = hal2_get_buffer(hal2, buffer, count);
1198                         if (err > 0) {
1199                                 count -= err;
1200                                 cnt += err;
1201                                 buffer += err;
1202                                 err = cnt;
1203                         }
1204                         if (count > 0 && err >= 0) {
1205                                 add_wait_queue(&adc->dma_wait, &wait);
1206                                 set_current_state(TASK_INTERRUPTIBLE);
1207                                 schedule_timeout(timeout);
1208                                 spin_lock_irqsave(&adc->lock, flags);
1209                                 if (!adc->desc[adc->tail].cnt)
1210                                         err = -EAGAIN;
1211                                 spin_unlock_irqrestore(&adc->lock, flags);
1212                                 if (signal_pending(current))
1213                                         err = -ERESTARTSYS;
1214                                 remove_wait_queue(&adc->dma_wait, &wait);
1215                                 if (err < 0) {
1216                                         hal2_stop_adc(hal2);
1217                                         hal2_reset_adc_pointer(hal2);
1218                                 }
1219                         }
1220                 } while (count > 0 && err >= 0);
1221         }
1222         mutex_unlock(&adc->sem);
1223
1224         return err;
1225 }
1226
1227 static ssize_t hal2_write(struct file *file, const char *buffer,
1228                           size_t count, loff_t *ppos)
1229 {
1230         ssize_t err;
1231         char *buf = (char*) buffer;
1232         struct hal2_card *hal2 = (struct hal2_card *) file->private_data;
1233         struct hal2_codec *dac = &hal2->dac;
1234
1235         if (!count)
1236                 return 0;
1237         if (mutex_lock_interruptible(&dac->sem))
1238                 return -EINTR;
1239         if (file->f_flags & O_NONBLOCK) {
1240                 err = hal2_add_buffer(hal2, buf, count);
1241                 err = err == 0 ? -EAGAIN : err;
1242         } else {
1243                 do {
1244                         /* ~10% longer */
1245                         signed long timeout = 1000 * H2_BLOCK_SIZE *
1246                                 2 * dac->voices * HZ / dac->sample_rate / 900;
1247                         unsigned long flags;
1248                         DECLARE_WAITQUEUE(wait, current);
1249                         ssize_t cnt = 0;
1250
1251                         err = hal2_add_buffer(hal2, buf, count);
1252                         if (err > 0) {
1253                                 count -= err;
1254                                 cnt += err;
1255                                 buf += err;
1256                                 err = cnt;
1257                         }
1258                         if (count > 0 && err >= 0) {
1259                                 add_wait_queue(&dac->dma_wait, &wait);
1260                                 set_current_state(TASK_INTERRUPTIBLE);
1261                                 schedule_timeout(timeout);
1262                                 spin_lock_irqsave(&dac->lock, flags);
1263                                 if (dac->desc[dac->head].cnt)
1264                                         err = -EAGAIN;
1265                                 spin_unlock_irqrestore(&dac->lock, flags);
1266                                 if (signal_pending(current))
1267                                         err = -ERESTARTSYS;
1268                                 remove_wait_queue(&dac->dma_wait, &wait);
1269                                 if (err < 0) {
1270                                         hal2_stop_dac(hal2);
1271                                         hal2_reset_dac_pointer(hal2);
1272                                 }
1273                         }
1274                 } while (count > 0 && err >= 0);
1275         }
1276         mutex_unlock(&dac->sem);
1277
1278         return err;
1279 }
1280
1281 static unsigned int hal2_poll(struct file *file, struct poll_table_struct *wait)
1282 {
1283         unsigned long flags;
1284         unsigned int mask = 0;
1285         struct hal2_card *hal2 = (struct hal2_card *) file->private_data;
1286
1287         if (file->f_mode & FMODE_READ) {
1288                 struct hal2_codec *adc = &hal2->adc;
1289
1290                 poll_wait(file, &adc->dma_wait, wait);
1291                 spin_lock_irqsave(&adc->lock, flags);
1292                 if (adc->desc[adc->tail].cnt > 0)
1293                         mask |= POLLIN;
1294                 spin_unlock_irqrestore(&adc->lock, flags);
1295         }
1296
1297         if (file->f_mode & FMODE_WRITE) {
1298                 struct hal2_codec *dac = &hal2->dac;
1299
1300                 poll_wait(file, &dac->dma_wait, wait);
1301                 spin_lock_irqsave(&dac->lock, flags);
1302                 if (dac->desc[dac->head].cnt == 0)
1303                         mask |= POLLOUT;
1304                 spin_unlock_irqrestore(&dac->lock, flags);
1305         }
1306
1307         return mask;
1308 }
1309
1310 static int hal2_open(struct inode *inode, struct file *file)
1311 {
1312         int err;
1313         struct hal2_card *hal2 = hal2_dsp_find_card(iminor(inode));
1314
1315         if (!hal2)
1316                 return -ENODEV;
1317         file->private_data = hal2;
1318         if (file->f_mode & FMODE_READ) {
1319                 struct hal2_codec *adc = &hal2->adc;
1320
1321                 if (adc->usecount)
1322                         return -EBUSY;
1323                 /* OSS spec wanted us to use 8 bit, 8 kHz mono by default,
1324                  * but HAL2 can't do 8bit audio */
1325                 adc->format = AFMT_S16_BE;
1326                 adc->voices = 1;
1327                 adc->sample_rate = hal2_compute_rate(adc, 8000);
1328                 hal2_set_adc_rate(hal2);
1329                 err = hal2_alloc_adc_dmabuf(adc);
1330                 if (err)
1331                         return err;
1332                 hal2_setup_adc(hal2);
1333                 adc->usecount++;
1334         }
1335         if (file->f_mode & FMODE_WRITE) {
1336                 struct hal2_codec *dac = &hal2->dac;
1337
1338                 if (dac->usecount)
1339                         return -EBUSY;
1340                 dac->format = AFMT_S16_BE;
1341                 dac->voices = 1;
1342                 dac->sample_rate = hal2_compute_rate(dac, 8000);
1343                 hal2_set_dac_rate(hal2);
1344                 err = hal2_alloc_dac_dmabuf(dac);
1345                 if (err)
1346                         return err;
1347                 hal2_setup_dac(hal2);
1348                 dac->usecount++;
1349         }
1350
1351         return nonseekable_open(inode, file);
1352 }
1353
1354 static int hal2_release(struct inode *inode, struct file *file)
1355 {
1356         struct hal2_card *hal2 = (struct hal2_card *) file->private_data;
1357
1358         if (file->f_mode & FMODE_READ) {
1359                 struct hal2_codec *adc = &hal2->adc;
1360
1361                 mutex_lock(&adc->sem);
1362                 hal2_stop_adc(hal2);
1363                 hal2_free_adc_dmabuf(adc);
1364                 adc->usecount--;
1365                 mutex_unlock(&adc->sem);
1366         }
1367         if (file->f_mode & FMODE_WRITE) {
1368                 struct hal2_codec *dac = &hal2->dac;
1369
1370                 mutex_lock(&dac->sem);
1371                 hal2_sync_dac(hal2);
1372                 hal2_free_dac_dmabuf(dac);
1373                 dac->usecount--;
1374                 mutex_unlock(&dac->sem);
1375         }
1376
1377         return 0;
1378 }
1379
1380 static struct file_operations hal2_audio_fops = {
1381         .owner          = THIS_MODULE,
1382         .llseek         = no_llseek,
1383         .read           = hal2_read,
1384         .write          = hal2_write,
1385         .poll           = hal2_poll,
1386         .ioctl          = hal2_ioctl,
1387         .open           = hal2_open,
1388         .release        = hal2_release,
1389 };
1390
1391 static struct file_operations hal2_mixer_fops = {
1392         .owner          = THIS_MODULE,
1393         .llseek         = no_llseek,
1394         .ioctl          = hal2_ioctl_mixdev,
1395         .open           = hal2_open_mixdev,
1396         .release        = hal2_release_mixdev,
1397 };
1398
1399 static void hal2_init_codec(struct hal2_codec *codec, struct hpc3_regs *hpc3,
1400                             int index)
1401 {
1402         codec->pbus.pbusnr = index;
1403         codec->pbus.pbus = &hpc3->pbdma[index];
1404         init_waitqueue_head(&codec->dma_wait);
1405         mutex_init(&codec->sem);
1406         spin_lock_init(&codec->lock);
1407 }
1408
1409 static int hal2_detect(struct hal2_card *hal2)
1410 {
1411         unsigned short board, major, minor;
1412         unsigned short rev;
1413
1414         /* reset HAL2 */
1415         hal2_isr_write(hal2, 0);
1416         /* release reset */
1417         hal2_isr_write(hal2, H2_ISR_GLOBAL_RESET_N | H2_ISR_CODEC_RESET_N);
1418
1419         hal2_i_write16(hal2, H2I_RELAY_C, H2I_RELAY_C_STATE); 
1420         if ((rev = hal2_rev_look(hal2)) & H2_REV_AUDIO_PRESENT)
1421                 return -ENODEV;
1422
1423         board = (rev & H2_REV_BOARD_M) >> 12;
1424         major = (rev & H2_REV_MAJOR_CHIP_M) >> 4;
1425         minor = (rev & H2_REV_MINOR_CHIP_M);
1426
1427         printk(KERN_INFO "SGI HAL2 revision %i.%i.%i\n",
1428                board, major, minor);
1429
1430         return 0;
1431 }
1432
1433 static int hal2_init_card(struct hal2_card **phal2, struct hpc3_regs *hpc3)
1434 {
1435         int ret = 0;
1436         struct hal2_card *hal2;
1437
1438         hal2 = (struct hal2_card *) kmalloc(sizeof(struct hal2_card), GFP_KERNEL);
1439         if (!hal2)
1440                 return -ENOMEM;
1441         memset(hal2, 0, sizeof(struct hal2_card));
1442
1443         hal2->ctl_regs = (struct hal2_ctl_regs *)hpc3->pbus_extregs[0];
1444         hal2->aes_regs = (struct hal2_aes_regs *)hpc3->pbus_extregs[1];
1445         hal2->vol_regs = (struct hal2_vol_regs *)hpc3->pbus_extregs[2];
1446         hal2->syn_regs = (struct hal2_syn_regs *)hpc3->pbus_extregs[3];
1447
1448         if (hal2_detect(hal2) < 0) {
1449                 ret = -ENODEV;
1450                 goto free_card;
1451         }
1452
1453         hal2_init_codec(&hal2->dac, hpc3, 0);
1454         hal2_init_codec(&hal2->adc, hpc3, 1);
1455
1456         /*
1457          * All DMA channel interfaces in HAL2 are designed to operate with
1458          * PBUS programmed for 2 cycles in D3, 2 cycles in D4 and 2 cycles
1459          * in D5. HAL2 is a 16-bit device which can accept both big and little
1460          * endian format. It assumes that even address bytes are on high
1461          * portion of PBUS (15:8) and assumes that HPC3 is programmed to
1462          * accept a live (unsynchronized) version of P_DREQ_N from HAL2.
1463          */
1464 #define HAL2_PBUS_DMACFG ((0 << HPC3_DMACFG_D3R_SHIFT) | \
1465                           (2 << HPC3_DMACFG_D4R_SHIFT) | \
1466                           (2 << HPC3_DMACFG_D5R_SHIFT) | \
1467                           (0 << HPC3_DMACFG_D3W_SHIFT) | \
1468                           (2 << HPC3_DMACFG_D4W_SHIFT) | \
1469                           (2 << HPC3_DMACFG_D5W_SHIFT) | \
1470                                 HPC3_DMACFG_DS16 | \
1471                                 HPC3_DMACFG_EVENHI | \
1472                                 HPC3_DMACFG_RTIME | \
1473                           (8 << HPC3_DMACFG_BURST_SHIFT) | \
1474                                 HPC3_DMACFG_DRQLIVE)
1475         /*
1476          * Ignore what's mentioned in the specification and write value which
1477          * works in The Real World (TM)
1478          */
1479         hpc3->pbus_dmacfg[hal2->dac.pbus.pbusnr][0] = 0x8208844;
1480         hpc3->pbus_dmacfg[hal2->adc.pbus.pbusnr][0] = 0x8208844;
1481
1482         if (request_irq(SGI_HPCDMA_IRQ, hal2_interrupt, SA_SHIRQ,
1483                         hal2str, hal2)) {
1484                 printk(KERN_ERR "HAL2: Can't get irq %d\n", SGI_HPCDMA_IRQ);
1485                 ret = -EAGAIN;
1486                 goto free_card;
1487         }
1488
1489         hal2->dev_dsp = register_sound_dsp(&hal2_audio_fops, -1);
1490         if (hal2->dev_dsp < 0) {
1491                 ret = hal2->dev_dsp;
1492                 goto free_irq;
1493         }
1494
1495         hal2->dev_mixer = register_sound_mixer(&hal2_mixer_fops, -1);
1496         if (hal2->dev_mixer < 0) {
1497                 ret = hal2->dev_mixer;
1498                 goto unregister_dsp;
1499         }
1500
1501         hal2_init_mixer(hal2);
1502
1503         *phal2 = hal2;
1504         return 0;
1505 unregister_dsp:
1506         unregister_sound_dsp(hal2->dev_dsp);
1507 free_irq:
1508         free_irq(SGI_HPCDMA_IRQ, hal2);
1509 free_card:
1510         kfree(hal2);
1511
1512         return ret;
1513 }
1514
1515 extern void (*indy_volume_button)(int);
1516
1517 /* 
1518  * Assuming only one HAL2 card. Mail me if you ever meet machine with
1519  * more than one.
1520  */
1521 static int __init init_hal2(void)
1522 {
1523         int i, error;
1524
1525         for (i = 0; i < MAXCARDS; i++)
1526                 hal2_card[i] = NULL;
1527
1528         error = hal2_init_card(&hal2_card[0], hpc3c0);
1529
1530         /* let Indy's volume buttons work */
1531         if (!error && !ip22_is_fullhouse())
1532                 indy_volume_button = hal2_volume_control;
1533
1534         return error;
1535
1536 }
1537
1538 static void __exit exit_hal2(void)
1539 {
1540         int i;
1541
1542         /* unregister volume butons callback function */
1543         indy_volume_button = NULL;
1544         
1545         for (i = 0; i < MAXCARDS; i++)
1546                 if (hal2_card[i]) {
1547                         free_irq(SGI_HPCDMA_IRQ, hal2_card[i]);
1548                         unregister_sound_dsp(hal2_card[i]->dev_dsp);
1549                         unregister_sound_mixer(hal2_card[i]->dev_mixer);
1550                         kfree(hal2_card[i]);
1551         }
1552 }
1553
1554 module_init(init_hal2);
1555 module_exit(exit_hal2);
1556
1557 MODULE_DESCRIPTION("OSS compatible driver for SGI HAL2 audio");
1558 MODULE_AUTHOR("Ladislav Michl");
1559 MODULE_LICENSE("GPL");