drivers/sound/uart6850.c

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 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  * Jeff Garzik: Made it work again, in theory
 17  * FIXME: If the request_irq() succeeds, the probe succeeds. Ug.
 18  *
 19  * Status: Testing required (no shit -jgarzik)
 20  *
 21  *
 22  */
 23
 24 #include <linux/init.h>
 25 #include <linux/module.h>
 26
 27 /* Mon Nov 22 22:38:35 MET 1993 marco@driq.home.usn.nl:
 28  * added 6850 support, used with COVOX SoundMaster II and custom cards.
 29  */
 30
 31 #include"sound_config.h"
 32
 33 static int uart6850_base =0x330;
 34
 35 static int*uart6850_osp;
 36
 37 #define DATAPORT (uart6850_base)
 38 #define COMDPORT (uart6850_base+1)
 39 #define STATPORT (uart6850_base+1)
 40
 41 static intuart6850_status(void)
 42 {
 43 returninb(STATPORT);
 44 }
 45
 46 #define input_avail() (uart6850_status()&INPUT_AVAIL)
 47 #define output_ready() (uart6850_status()&OUTPUT_READY)
 48
 49 static voiduart6850_cmd(unsigned char cmd)
 50 {
 51 outb(cmd, COMDPORT);
 52 }
 53
 54 static intuart6850_read(void)
 55 {
 56 returninb(DATAPORT);
 57 }
 58
 59 static voiduart6850_write(unsigned char byte)
 60 {
 61 outb(byte, DATAPORT);
 62 }
 63
 64 #define OUTPUT_READY 0x02/* Mask for data ready Bit */
 65 #define INPUT_AVAIL 0x01/* Mask for Data Send Ready Bit */
 66
 67 #define UART_RESET 0x95
 68 #define UART_MODE_ON 0x03
 69
 70 static int uart6850_opened;
 71 static int uart6850_irq;
 72 static int uart6850_detected;
 73 static int my_dev;
 74
 75 static void(*midi_input_intr) (int dev,unsigned char data);
 76 static voidpoll_uart6850(unsigned long dummy);
 77
 78
 79 static struct timer_list uart6850_timer = {
 80  function: poll_uart6850
 81 };
 82
 83 static voiduart6850_input_loop(void)
 84 {
 85 int count =10;
 86
 87 while(count)
 88 {
 89 /*
 90  * Not timed out
 91  */
 92 if(input_avail())
 93 {
 94 unsigned char c =uart6850_read();
 95  count =100;
 96 if(uart6850_opened & OPEN_READ)
 97 midi_input_intr(my_dev, c);
 98 }
 99 else
 100 {
 101 while(!input_avail() && count)
 102  count--;
 103 }
 104 }
 105 }
 106
 107 voidm6850intr(int irq,void*dev_id,struct pt_regs *dummy)
 108 {
 109 if(input_avail())
 110 uart6850_input_loop();
 111 }
 112
 113 /*
 114  * It looks like there is no input interrupts in the UART mode. Let's try
 115  * polling.
 116  */
 117
 118 static voidpoll_uart6850(unsigned long dummy)
 119 {
 120 unsigned long flags;
 121
 122 if(!(uart6850_opened & OPEN_READ))
 123 return;/* Device has been closed */
 124
 125 save_flags(flags);
 126 cli();
 127
 128 if(input_avail())
 129 uart6850_input_loop();
 130
 131  uart6850_timer.expires =1+ jiffies;
 132 add_timer(&uart6850_timer);
 133
 134 /*
 135  * Come back later
 136  */
 137
 138 restore_flags(flags);
 139 }
 140
 141 static intuart6850_open(int dev,int mode,
 142 void(*input) (int dev,unsigned char data),
 143 void(*output) (int dev)
 144 )
 145 {
 146 if(uart6850_opened)
 147 {
 148 /* printk("Midi6850: Midi busy\n");*/
 149 return-EBUSY;
 150 };
 151
 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 return0;
 161 }
 162
 163 static voiduart6850_close(int dev)
 164 {
 165 uart6850_cmd(UART_MODE_ON);
 166 del_timer(&uart6850_timer);
 167  uart6850_opened =0;
 168 }
 169
 170 static intuart6850_out(int dev,unsigned char midi_byte)
 171 {
 172 int timeout;
 173 unsigned long flags;
 174
 175 /*
 176  * Test for input since pending input seems to block the output.
 177  */
 178
 179 save_flags(flags);
 180 cli();
 181
 182 if(input_avail())
 183 uart6850_input_loop();
 184
 185 restore_flags(flags);
 186
 187 /*
 188  * Sometimes it takes about 13000 loops before the output becomes ready
 189  * (After reset). Normally it takes just about 10 loops.
 190  */
 191
 192 for(timeout =30000; timeout >0&& !output_ready(); timeout--);/*
 193  * Wait
 194  */
 195 if(!output_ready())
 196 {
 197 printk(KERN_WARNING "Midi6850: Timeout\n");
 198 return0;
 199 }
 200 uart6850_write(midi_byte);
 201 return1;
 202 }
 203
 204 staticinlineintuart6850_command(int dev,unsigned char*midi_byte)
 205 {
 206 return1;
 207 }
 208
 209 staticinlineintuart6850_start_read(int dev)
 210 {
 211 return0;
 212 }
 213
 214 staticinlineintuart6850_end_read(int dev)
 215 {
 216 return0;
 217 }
 218
 219 staticinlinevoiduart6850_kick(int dev)
 220 {
 221 }
 222
 223 staticinlineintuart6850_buffer_status(int dev)
 224 {
 225 return0;/*
 226  * No data in buffers
 227  */
 228 }
 229
 230 #define MIDI_SYNTH_NAME"6850 UART Midi"
 231 #define MIDI_SYNTH_CAPS SYNTH_CAP_INPUT
 232 #include"midi_synth.h"
 233
 234 static struct midi_operations uart6850_operations =
 235 {
 236  owner: THIS_MODULE,
 237  info: {"6850 UART",0,0, SNDCARD_UART6850},
 238  converter: &std_midi_synth,
 239  in_info: {0},
 240  open: uart6850_open,
 241  close: uart6850_close,
 242  outputc: uart6850_out,
 243  start_read: uart6850_start_read,
 244  end_read: uart6850_end_read,
 245  kick: uart6850_kick,
 246  command: uart6850_command,
 247  buffer_status: uart6850_buffer_status
 248 };
 249
 250
 251 static void __init attach_uart6850(struct address_info *hw_config)
 252 {
 253 int ok, timeout;
 254 unsigned long flags;
 255
 256 if(!uart6850_detected)
 257 return;
 258
 259 if((my_dev =sound_alloc_mididev()) == -1)
 260 {
 261 printk(KERN_INFO "uart6850: Too many midi devices detected\n");
 262 return;
 263 }
 264  uart6850_base = hw_config->io_base;
 265  uart6850_osp = hw_config->osp;
 266  uart6850_irq = hw_config->irq;
 267
 268 save_flags(flags);
 269 cli();
 270
 271 for(timeout =30000; timeout >0&& !output_ready(); timeout--);/*
 272  * Wait
 273  */
 274 uart6850_cmd(UART_MODE_ON);
 275  ok =1;
 276 restore_flags(flags);
 277
 278 conf_printf("6850 Midi Interface", hw_config);
 279
 280  std_midi_synth.midi_dev = my_dev;
 281  hw_config->slots[4] = my_dev;
 282  midi_devs[my_dev] = &uart6850_operations;
 283 sequencer_init();
 284 }
 285
 286 staticinlineintreset_uart6850(void)
 287 {
 288 uart6850_read();
 289 return1;/*
 290  * OK
 291  */
 292 }
 293
 294 static int __init probe_uart6850(struct address_info *hw_config)
 295 {
 296 int ok;
 297
 298  uart6850_osp = hw_config->osp;
 299  uart6850_base = hw_config->io_base;
 300  uart6850_irq = hw_config->irq;
 301
 302 if(request_irq(uart6850_irq, m6850intr,0,"MIDI6850", NULL) <0)
 303 return0;
 304
 305  ok =reset_uart6850();
 306  uart6850_detected = ok;
 307 return ok;
 308 }
 309
 310 static void __exit unload_uart6850(struct address_info *hw_config)
 311 {
 312 free_irq(hw_config->irq, NULL);
 313 sound_unload_mididev(hw_config->slots[4]);
 314 }
 315
 316 static struct address_info cfg_mpu;
 317
 318 static int __initdata io = -1;
 319 static int __initdata irq = -1;
 320
 321 MODULE_PARM(io,"i");
 322 MODULE_PARM(irq,"i");
 323
 324 static int __init init_uart6850(void)
 325 {
 326  cfg_mpu.io_base = io;
 327  cfg_mpu.irq = irq;
 328
 329 if(cfg_mpu.io_base == -1|| cfg_mpu.irq == -1) {
 330 printk(KERN_INFO "uart6850: irq and io must be set.\n");
 331 return-EINVAL;
 332 }
 333
 334 if(probe_uart6850(&cfg_mpu))
 335 return-ENODEV;
 336 attach_uart6850(&cfg_mpu);
 337
 338 return0;
 339 }
 340
 341 static void __exit cleanup_uart6850(void)
 342 {
 343 unload_uart6850(&cfg_mpu);
 344 }
 345
 346 module_init(init_uart6850);
 347 module_exit(cleanup_uart6850);
 348
 349 #ifndef MODULE
 350 static int __init setup_uart6850(char*str)
 351 {
 352 /* io, irq */
 353 int ints[3];
 354
 355  str =get_options(str,ARRAY_SIZE(ints), ints);
 356
 357  io = ints[1];
 358  irq = ints[2];
 359
 360 return1;
 361 }
 362 __setup("uart6850=", setup_uart6850);
 363 #endif