Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 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/interrupt.h> |
| 26 | #include <linux/module.h> |
| 27 | #include <linux/spinlock.h> |
| 28 | /* Mon Nov 22 22:38:35 MET 1993 marco@driq.home.usn.nl: |
| 29 | * added 6850 support, used with COVOX SoundMaster II and custom cards. |
| 30 | */ |
| 31 | |
| 32 | #include "sound_config.h" |
| 33 | |
| 34 | static int uart6850_base = 0x330; |
| 35 | |
| 36 | static int *uart6850_osp; |
| 37 | |
| 38 | #define DATAPORT (uart6850_base) |
| 39 | #define COMDPORT (uart6850_base+1) |
| 40 | #define STATPORT (uart6850_base+1) |
| 41 | |
| 42 | static int uart6850_status(void) |
| 43 | { |
| 44 | return inb(STATPORT); |
| 45 | } |
| 46 | |
| 47 | #define input_avail() (uart6850_status()&INPUT_AVAIL) |
| 48 | #define output_ready() (uart6850_status()&OUTPUT_READY) |
| 49 | |
| 50 | static void uart6850_cmd(unsigned char cmd) |
| 51 | { |
| 52 | outb(cmd, COMDPORT); |
| 53 | } |
| 54 | |
| 55 | static int uart6850_read(void) |
| 56 | { |
| 57 | return inb(DATAPORT); |
| 58 | } |
| 59 | |
| 60 | static void uart6850_write(unsigned char byte) |
| 61 | { |
| 62 | outb(byte, DATAPORT); |
| 63 | } |
| 64 | |
| 65 | #define OUTPUT_READY 0x02 /* Mask for data ready Bit */ |
| 66 | #define INPUT_AVAIL 0x01 /* Mask for Data Send Ready Bit */ |
| 67 | |
| 68 | #define UART_RESET 0x95 |
| 69 | #define UART_MODE_ON 0x03 |
| 70 | |
| 71 | static int uart6850_opened; |
| 72 | static int uart6850_irq; |
| 73 | static int uart6850_detected; |
| 74 | static int my_dev; |
| 75 | static DEFINE_SPINLOCK(lock); |
| 76 | |
| 77 | static void (*midi_input_intr) (int dev, unsigned char data); |
| 78 | static void poll_uart6850(unsigned long dummy); |
| 79 | |
| 80 | |
| 81 | static struct timer_list uart6850_timer = |
| 82 | TIMER_INITIALIZER(poll_uart6850, 0, 0); |
| 83 | |
| 84 | static void uart6850_input_loop(void) |
| 85 | { |
| 86 | int count = 10; |
| 87 | |
| 88 | while (count) |
| 89 | { |
| 90 | /* |
| 91 | * Not timed out |
| 92 | */ |
| 93 | if (input_avail()) |
| 94 | { |
| 95 | unsigned char c = uart6850_read(); |
| 96 | count = 100; |
| 97 | if (uart6850_opened & OPEN_READ) |
| 98 | midi_input_intr(my_dev, c); |
| 99 | } |
| 100 | else |
| 101 | { |
| 102 | while (!input_avail() && count) |
| 103 | count--; |
| 104 | } |
| 105 | } |
| 106 | } |
| 107 | |
| 108 | static irqreturn_t m6850intr(int irq, void *dev_id, struct pt_regs *dummy) |
| 109 | { |
| 110 | if (input_avail()) |
| 111 | uart6850_input_loop(); |
| 112 | return IRQ_HANDLED; |
| 113 | } |
| 114 | |
| 115 | /* |
| 116 | * It looks like there is no input interrupts in the UART mode. Let's try |
| 117 | * polling. |
| 118 | */ |
| 119 | |
| 120 | static void poll_uart6850(unsigned long dummy) |
| 121 | { |
| 122 | unsigned long flags; |
| 123 | |
| 124 | if (!(uart6850_opened & OPEN_READ)) |
| 125 | return; /* Device has been closed */ |
| 126 | |
| 127 | spin_lock_irqsave(&lock,flags); |
| 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 | spin_unlock_irqrestore(&lock,flags); |
| 139 | } |
| 140 | |
| 141 | static int uart6850_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 | 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 | } |
| 169 | |
| 170 | static int uart6850_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 | spin_lock_irqsave(&lock,flags); |
| 180 | |
| 181 | if (input_avail()) |
| 182 | uart6850_input_loop(); |
| 183 | |
| 184 | spin_unlock_irqrestore(&lock,flags); |
| 185 | |
| 186 | /* |
| 187 | * Sometimes it takes about 13000 loops before the output becomes ready |
| 188 | * (After reset). Normally it takes just about 10 loops. |
| 189 | */ |
| 190 | |
| 191 | for (timeout = 30000; timeout > 0 && !output_ready(); timeout--); /* |
| 192 | * Wait |
| 193 | */ |
| 194 | if (!output_ready()) |
| 195 | { |
| 196 | printk(KERN_WARNING "Midi6850: Timeout\n"); |
| 197 | return 0; |
| 198 | } |
| 199 | uart6850_write(midi_byte); |
| 200 | return 1; |
| 201 | } |
| 202 | |
| 203 | static inline int uart6850_command(int dev, unsigned char *midi_byte) |
| 204 | { |
| 205 | return 1; |
| 206 | } |
| 207 | |
| 208 | static inline int uart6850_start_read(int dev) |
| 209 | { |
| 210 | return 0; |
| 211 | } |
| 212 | |
| 213 | static inline int uart6850_end_read(int dev) |
| 214 | { |
| 215 | return 0; |
| 216 | } |
| 217 | |
| 218 | static inline void uart6850_kick(int dev) |
| 219 | { |
| 220 | } |
| 221 | |
| 222 | static inline int uart6850_buffer_status(int dev) |
| 223 | { |
| 224 | return 0; /* |
| 225 | * No data in buffers |
| 226 | */ |
| 227 | } |
| 228 | |
| 229 | #define MIDI_SYNTH_NAME "6850 UART Midi" |
| 230 | #define MIDI_SYNTH_CAPS SYNTH_CAP_INPUT |
| 231 | #include "midi_synth.h" |
| 232 | |
| 233 | static struct midi_operations uart6850_operations = |
| 234 | { |
| 235 | .owner = THIS_MODULE, |
| 236 | .info = {"6850 UART", 0, 0, SNDCARD_UART6850}, |
| 237 | .converter = &std_midi_synth, |
| 238 | .in_info = {0}, |
| 239 | .open = uart6850_open, |
| 240 | .close = uart6850_close, |
| 241 | .outputc = uart6850_out, |
| 242 | .start_read = uart6850_start_read, |
| 243 | .end_read = uart6850_end_read, |
| 244 | .kick = uart6850_kick, |
| 245 | .command = uart6850_command, |
| 246 | .buffer_status = uart6850_buffer_status |
| 247 | }; |
| 248 | |
| 249 | |
| 250 | static void __init attach_uart6850(struct address_info *hw_config) |
| 251 | { |
| 252 | int ok, timeout; |
| 253 | unsigned long flags; |
| 254 | |
| 255 | if (!uart6850_detected) |
| 256 | return; |
| 257 | |
| 258 | if ((my_dev = sound_alloc_mididev()) == -1) |
| 259 | { |
| 260 | printk(KERN_INFO "uart6850: Too many midi devices detected\n"); |
| 261 | return; |
| 262 | } |
| 263 | uart6850_base = hw_config->io_base; |
| 264 | uart6850_osp = hw_config->osp; |
| 265 | uart6850_irq = hw_config->irq; |
| 266 | |
| 267 | spin_lock_irqsave(&lock,flags); |
| 268 | |
| 269 | for (timeout = 30000; timeout > 0 && !output_ready(); timeout--); /* |
| 270 | * Wait |
| 271 | */ |
| 272 | uart6850_cmd(UART_MODE_ON); |
| 273 | ok = 1; |
| 274 | spin_unlock_irqrestore(&lock,flags); |
| 275 | |
| 276 | conf_printf("6850 Midi Interface", hw_config); |
| 277 | |
| 278 | std_midi_synth.midi_dev = my_dev; |
| 279 | hw_config->slots[4] = my_dev; |
| 280 | midi_devs[my_dev] = &uart6850_operations; |
| 281 | sequencer_init(); |
| 282 | } |
| 283 | |
| 284 | static inline int reset_uart6850(void) |
| 285 | { |
| 286 | uart6850_read(); |
| 287 | return 1; /* |
| 288 | * OK |
| 289 | */ |
| 290 | } |
| 291 | |
| 292 | static int __init probe_uart6850(struct address_info *hw_config) |
| 293 | { |
| 294 | int ok; |
| 295 | |
| 296 | uart6850_osp = hw_config->osp; |
| 297 | uart6850_base = hw_config->io_base; |
| 298 | uart6850_irq = hw_config->irq; |
| 299 | |
| 300 | if (request_irq(uart6850_irq, m6850intr, 0, "MIDI6850", NULL) < 0) |
| 301 | return 0; |
| 302 | |
| 303 | ok = reset_uart6850(); |
| 304 | uart6850_detected = ok; |
| 305 | return ok; |
| 306 | } |
| 307 | |
| 308 | static void __exit unload_uart6850(struct address_info *hw_config) |
| 309 | { |
| 310 | free_irq(hw_config->irq, NULL); |
| 311 | sound_unload_mididev(hw_config->slots[4]); |
| 312 | } |
| 313 | |
| 314 | static struct address_info cfg_mpu; |
| 315 | |
| 316 | static int __initdata io = -1; |
| 317 | static int __initdata irq = -1; |
| 318 | |
| 319 | module_param(io, int, 0); |
| 320 | module_param(irq, int, 0); |
| 321 | |
| 322 | static int __init init_uart6850(void) |
| 323 | { |
| 324 | cfg_mpu.io_base = io; |
| 325 | cfg_mpu.irq = irq; |
| 326 | |
| 327 | if (cfg_mpu.io_base == -1 || cfg_mpu.irq == -1) { |
| 328 | printk(KERN_INFO "uart6850: irq and io must be set.\n"); |
| 329 | return -EINVAL; |
| 330 | } |
| 331 | |
| 332 | if (probe_uart6850(&cfg_mpu)) |
| 333 | return -ENODEV; |
| 334 | attach_uart6850(&cfg_mpu); |
| 335 | |
| 336 | return 0; |
| 337 | } |
| 338 | |
| 339 | static void __exit cleanup_uart6850(void) |
| 340 | { |
| 341 | unload_uart6850(&cfg_mpu); |
| 342 | } |
| 343 | |
| 344 | module_init(init_uart6850); |
| 345 | module_exit(cleanup_uart6850); |
| 346 | |
| 347 | #ifndef MODULE |
| 348 | static int __init setup_uart6850(char *str) |
| 349 | { |
| 350 | /* io, irq */ |
| 351 | int ints[3]; |
| 352 | |
| 353 | str = get_options(str, ARRAY_SIZE(ints), ints); |
| 354 | |
| 355 | io = ints[1]; |
| 356 | irq = ints[2]; |
| 357 | |
| 358 | return 1; |
| 359 | } |
| 360 | __setup("uart6850=", setup_uart6850); |
| 361 | #endif |
| 362 | MODULE_LICENSE("GPL"); |