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)
 374 {
 375         struct hal2_card *hal2 = 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 const 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 const 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 = kzalloc(sizeof(struct hal2_card), GFP_KERNEL);
1439         if (!hal2)
1440                 return -ENOMEM;
1441
1442         hal2->ctl_regs = (struct hal2_ctl_regs *)hpc3->pbus_extregs[0];
1443         hal2->aes_regs = (struct hal2_aes_regs *)hpc3->pbus_extregs[1];
1444         hal2->vol_regs = (struct hal2_vol_regs *)hpc3->pbus_extregs[2];
1445         hal2->syn_regs = (struct hal2_syn_regs *)hpc3->pbus_extregs[3];
1446
1447         if (hal2_detect(hal2) < 0) {
1448                 ret = -ENODEV;
1449                 goto free_card;
1450         }
1451
1452         hal2_init_codec(&hal2->dac, hpc3, 0);
1453         hal2_init_codec(&hal2->adc, hpc3, 1);
1454
1455         /*
1456          * All DMA channel interfaces in HAL2 are designed to operate with
1457          * PBUS programmed for 2 cycles in D3, 2 cycles in D4 and 2 cycles
1458          * in D5. HAL2 is a 16-bit device which can accept both big and little
1459          * endian format. It assumes that even address bytes are on high
1460          * portion of PBUS (15:8) and assumes that HPC3 is programmed to
1461          * accept a live (unsynchronized) version of P_DREQ_N from HAL2.
1462          */
1463 #define HAL2_PBUS_DMACFG ((0 << HPC3_DMACFG_D3R_SHIFT) | \
1464                           (2 << HPC3_DMACFG_D4R_SHIFT) | \
1465                           (2 << HPC3_DMACFG_D5R_SHIFT) | \
1466                           (0 << HPC3_DMACFG_D3W_SHIFT) | \
1467                           (2 << HPC3_DMACFG_D4W_SHIFT) | \
1468                           (2 << HPC3_DMACFG_D5W_SHIFT) | \
1469                                 HPC3_DMACFG_DS16 | \
1470                                 HPC3_DMACFG_EVENHI | \
1471                                 HPC3_DMACFG_RTIME | \
1472                           (8 << HPC3_DMACFG_BURST_SHIFT) | \
1473                                 HPC3_DMACFG_DRQLIVE)
1474         /*
1475          * Ignore what's mentioned in the specification and write value which
1476          * works in The Real World (TM)
1477          */
1478         hpc3->pbus_dmacfg[hal2->dac.pbus.pbusnr][0] = 0x8208844;
1479         hpc3->pbus_dmacfg[hal2->adc.pbus.pbusnr][0] = 0x8208844;
1480
1481         if (request_irq(SGI_HPCDMA_IRQ, hal2_interrupt, IRQF_SHARED,
1482                         hal2str, hal2)) {
1483                 printk(KERN_ERR "HAL2: Can't get irq %d\n", SGI_HPCDMA_IRQ);
1484                 ret = -EAGAIN;
1485                 goto free_card;
1486         }
1487
1488         hal2->dev_dsp = register_sound_dsp(&hal2_audio_fops, -1);
1489         if (hal2->dev_dsp < 0) {
1490                 ret = hal2->dev_dsp;
1491                 goto free_irq;
1492         }
1493
1494         hal2->dev_mixer = register_sound_mixer(&hal2_mixer_fops, -1);
1495         if (hal2->dev_mixer < 0) {
1496                 ret = hal2->dev_mixer;
1497                 goto unregister_dsp;
1498         }
1499
1500         hal2_init_mixer(hal2);
1501
1502         *phal2 = hal2;
1503         return 0;
1504 unregister_dsp:
1505         unregister_sound_dsp(hal2->dev_dsp);
1506 free_irq:
1507         free_irq(SGI_HPCDMA_IRQ, hal2);
1508 free_card:
1509         kfree(hal2);
1510
1511         return ret;
1512 }
1513
1514 extern void (*indy_volume_button)(int);
1515
1516 /*
1517  * Assuming only one HAL2 card. Mail me if you ever meet machine with
1518  * more than one.
1519  */
1520 static int __init init_hal2(void)
1521 {
1522         int i, error;
1523
1524         for (i = 0; i < MAXCARDS; i++)
1525                 hal2_card[i] = NULL;
1526
1527         error = hal2_init_card(&hal2_card[0], hpc3c0);
1528
1529         /* let Indy's volume buttons work */
1530         if (!error && !ip22_is_fullhouse())
1531                 indy_volume_button = hal2_volume_control;
1532
1533         return error;
1534
1535 }
1536
1537 static void __exit exit_hal2(void)
1538 {
1539         int i;
1540
1541         /* unregister volume butons callback function */
1542         indy_volume_button = NULL;
1543
1544         for (i = 0; i < MAXCARDS; i++)
1545                 if (hal2_card[i]) {
1546                         free_irq(SGI_HPCDMA_IRQ, hal2_card[i]);
1547                         unregister_sound_dsp(hal2_card[i]->dev_dsp);
1548                         unregister_sound_mixer(hal2_card[i]->dev_mixer);
1549                         kfree(hal2_card[i]);
1550         }
1551 }
1552
1553 module_init(init_hal2);
1554 module_exit(exit_hal2);
1555
1556 MODULE_DESCRIPTION("OSS compatible driver for SGI HAL2 audio");
1557 MODULE_AUTHOR("Ladislav Michl");
1558 MODULE_LICENSE("GPL");