drivers/sound/uart6850.c

   1 /*
   2  * sound/uart6850.c
   3  *
   4  *
   5  * Copyright (C) by Hannu Savolainen 1993-1997
   6  *
   7  * OSS/Free for Linux is distributed under the GNU GENERAL PUBLIC LICENSE (GPL)
   8  * Version 2 (June 1991). See the "COPYING" file distributed with this software
   9  * for more info.
  10  * Extended by Alan Cox for Red Hat Software. Now a loadable MIDI driver.
  11  * 28/4/97 - (C) Copyright Alan Cox. Released under the GPL version 2.
  12  *
  13  * Alan Cox:            Updated for new modular code. Removed snd_* irq handling. Now
  14  *                      uses native linux resources
  15  * Christoph Hellwig:   Adapted to module_init/module_exit
  16  *
  17  *      Status: Testing required
  18  *
  19  */
  20
  21 #include <linux/init.h>
  22 #include <linux/module.h>
  23
  24 /* Mon Nov 22 22:38:35 MET 1993 marco@driq.home.usn.nl:
  25  *      added 6850 support, used with COVOX SoundMaster II and custom cards.
  26  */
  27
  28 #include "sound_config.h"
  29 #include "soundmodule.h"
  30
  31 static int uart6850_base = 0x330;
  32
  33 static int *uart6850_osp;
  34
  35 #define DATAPORT   (uart6850_base)
  36 #define COMDPORT   (uart6850_base+1)
  37 #define STATPORT   (uart6850_base+1)
  38
  39 static int uart6850_status(void)
  40 {
  41         return inb(STATPORT);
  42 }
  43
  44 #define input_avail()           (uart6850_status()&INPUT_AVAIL)
  45 #define output_ready()          (uart6850_status()&OUTPUT_READY)
  46
  47 static void uart6850_cmd(unsigned char cmd)
  48 {
  49         outb(cmd, COMDPORT);
  50 }
  51
  52 static int uart6850_read(void)
  53 {
  54         return inb(DATAPORT);
  55 }
  56
  57 static void uart6850_write(unsigned char byte)
  58 {
  59         outb(byte, DATAPORT);
  60 }
  61
  62 #define OUTPUT_READY    0x02    /* Mask for data ready Bit */
  63 #define INPUT_AVAIL     0x01    /* Mask for Data Send Ready Bit */
  64
  65 #define UART_RESET      0x95
  66 #define UART_MODE_ON    0x03
  67
  68 static int uart6850_opened = 0;
  69 static int uart6850_irq;
  70 static int uart6850_detected = 0;
  71 static int my_dev;
  72
  73 static int reset_uart6850(void);
  74 static void (*midi_input_intr) (int dev, unsigned char data);
  75 static void poll_uart6850(unsigned long dummy);
  76
  77
  78 static struct timer_list uart6850_timer = {
  79         NULL, NULL, 0, 0, poll_uart6850
  80 };
  81
  82 static void uart6850_input_loop(void)
  83 {
  84         int count = 10;
  85
  86         while (count)
  87         {
  88                 /*
  89                  * Not timed out
  90                  */
  91                 if (input_avail())
  92                 {
  93                         unsigned char c = uart6850_read();
  94                         count = 100;
  95                         if (uart6850_opened & OPEN_READ)
  96                                 midi_input_intr(my_dev, c);
  97                 }
  98                 else
  99                 {
 100                         while (!input_avail() && count)
 101                                 count--;
 102                 }
 103         }
 104 }
 105
 106 void m6850intr(int irq, void *dev_id, struct pt_regs *dummy)
 107 {
 108         if (input_avail())
 109                 uart6850_input_loop();
 110 }
 111
 112 /*
 113  *      It looks like there is no input interrupts in the UART mode. Let's try
 114  *      polling.
 115  */
 116
 117 static void poll_uart6850(unsigned long dummy)
 118 {
 119         unsigned long flags;
 120
 121         if (!(uart6850_opened & OPEN_READ))
 122                 return;         /* Device has been closed */
 123
 124         save_flags(flags);
 125         cli();
 126
 127         if (input_avail())
 128                 uart6850_input_loop();
 129
 130         uart6850_timer.expires = 1 + jiffies;
 131         add_timer(&uart6850_timer);
 132
 133         /*
 134          *      Come back later
 135          */
 136
 137         restore_flags(flags);
 138 }
 139
 140 static int uart6850_open(int dev, int mode,
 141               void            (*input) (int dev, unsigned char data),
 142               void            (*output) (int dev)
 143 )
 144 {
 145         if (uart6850_opened)
 146         {
 147 /*                printk("Midi6850: Midi busy\n");*/
 148                   return -EBUSY;
 149         };
 150
 151         MOD_INC_USE_COUNT;
 152         uart6850_cmd(UART_RESET);
 153         uart6850_input_loop();
 154         midi_input_intr = input;
 155         uart6850_opened = mode;
 156         poll_uart6850(0);       /*
 157                                  * Enable input polling
 158                                  */
 159
 160         return 0;
 161 }
 162
 163 static void uart6850_close(int dev)
 164 {
 165         uart6850_cmd(UART_MODE_ON);
 166         del_timer(&uart6850_timer);
 167         uart6850_opened = 0;
 168         MOD_DEC_USE_COUNT;
 169 }
 170
 171 static int uart6850_out(int dev, unsigned char midi_byte)
 172 {
 173         int timeout;
 174         unsigned long flags;
 175
 176         /*
 177          * Test for input since pending input seems to block the output.
 178          */
 179
 180         save_flags(flags);
 181         cli();
 182
 183         if (input_avail())
 184                 uart6850_input_loop();
 185
 186         restore_flags(flags);
 187
 188         /*
 189          * Sometimes it takes about 13000 loops before the output becomes ready
 190          * (After reset). Normally it takes just about 10 loops.
 191          */
 192
 193         for (timeout = 30000; timeout > 0 && !output_ready(); timeout--);       /*
 194                                                                                  * Wait
 195                                                                                  */
 196         if (!output_ready())
 197         {
 198                 printk(KERN_WARNING "Midi6850: Timeout\n");
 199                 return 0;
 200         }
 201         uart6850_write(midi_byte);
 202         return 1;
 203 }
 204
 205 static inline int uart6850_command(int dev, unsigned char *midi_byte)
 206 {
 207         return 1;
 208 }
 209
 210 static inline int uart6850_start_read(int dev)
 211 {
 212         return 0;
 213 }
 214
 215 static inline int uart6850_end_read(int dev)
 216 {
 217         return 0;
 218 }
 219
 220 static inline void uart6850_kick(int dev)
 221 {
 222 }
 223
 224 static inline int uart6850_buffer_status(int dev)
 225 {
 226         return 0;               /*
 227                                  * No data in buffers
 228                                  */
 229 }
 230
 231 #define MIDI_SYNTH_NAME "6850 UART Midi"
 232 #define MIDI_SYNTH_CAPS SYNTH_CAP_INPUT
 233 #include "midi_synth.h"
 234
 235 static struct midi_operations uart6850_operations =
 236 {
 237         {"6850 UART", 0, 0, SNDCARD_UART6850},
 238         &std_midi_synth,
 239         {0},
 240         uart6850_open,
 241         uart6850_close,
 242         NULL, /* ioctl */
 243         uart6850_out,
 244         uart6850_start_read,
 245         uart6850_end_read,
 246         uart6850_kick,
 247         uart6850_command,
 248         uart6850_buffer_status
 249 };
 250
 251
 252 static void __init attach_uart6850(struct address_info *hw_config)
 253 {
 254         int ok, timeout;
 255         unsigned long   flags;
 256
 257         if ((my_dev = sound_alloc_mididev()) == -1)
 258         {
 259                 printk(KERN_INFO "uart6850: Too many midi devices detected\n");
 260                 return;
 261         }
 262         uart6850_base = hw_config->io_base;
 263         uart6850_osp = hw_config->osp;
 264         uart6850_irq = hw_config->irq;
 265
 266         if (!uart6850_detected)
 267         {
 268                 sound_unload_mididev(my_dev);
 269                 return;
 270         }
 271         save_flags(flags);
 272         cli();
 273
 274         for (timeout = 30000; timeout > 0 && !output_ready(); timeout--);       /*
 275                                                                                  * Wait
 276                                                                                  */
 277         uart6850_cmd(UART_MODE_ON);
 278         ok = 1;
 279         restore_flags(flags);
 280
 281         conf_printf("6850 Midi Interface", hw_config);
 282
 283         std_midi_synth.midi_dev = my_dev;
 284         hw_config->slots[4] = my_dev;
 285         midi_devs[my_dev] = &uart6850_operations;
 286         sequencer_init();
 287 }
 288
 289 static int reset_uart6850(void)
 290 {
 291         uart6850_read();
 292         return 1;               /*
 293                                  * OK
 294                                  */
 295 }
 296
 297
 298 static int __init probe_uart6850(struct address_info *hw_config)
 299 {
 300         int ok = 0;
 301
 302         uart6850_osp = hw_config->osp;
 303         uart6850_base = hw_config->io_base;
 304         uart6850_irq = hw_config->irq;
 305
 306         if (request_irq(uart6850_irq, m6850intr, 0, "MIDI6850", NULL) < 0)
 307                 return 0;
 308
 309         ok = reset_uart6850();
 310         uart6850_detected = ok;
 311         return ok;
 312 }
 313
 314 static void __exit unload_uart6850(struct address_info *hw_config)
 315 {
 316         free_irq(hw_config->irq, NULL);
 317         sound_unload_mididev(hw_config->slots[4]);
 318 }
 319
 320 static struct address_info cfg_mpu;
 321
 322 static int __initdata io = -1;
 323 static int __initdata irq = -1;
 324
 325 MODULE_PARM(io,"i");
 326 MODULE_PARM(irq,"i");
 327
 328 static int __init init_uart6850(void)
 329 {
 330         cfg_mpu.io_base = io;
 331         cfg_mpu.irq = irq;
 332
 333         if (cfg_mpu.io_base == -1 || cfg_mpu.irq == -1) {
 334                 printk(KERN_INFO "uart6850: irq and io must be set.\n");
 335                 return -EINVAL;
 336         }
 337
 338         if (probe_uart6850(&cfg_mpu))
 339                 return -ENODEV;
 340
 341         SOUND_LOCK;
 342         return 0;
 343 }
 344
 345 static void __exit cleanup_uart6850(void)
 346 {
 347         unload_uart6850(&cfg_mpu);
 348         SOUND_LOCK_END;
 349 }
 350
 351 module_init(init_uart6850);
 352 module_exit(cleanup_uart6850);
 353
 354 #ifndef MODULE
 355 static int __init setup_uart6850(char *str)
 356 {
 357         /* io, irq */
 358         int ints[3];
 359
 360         str = get_options(str, ARRAY_SIZE(ints), ints);
 361
 362         io = ints[1];
 363         irq = ints[2];
 364
 365         return 1;
 366 }
 367 __setup("uart6850=", setup_uart6850);
 368 #endif