sound/oss/sh_dac_audio.c

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