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 int uart6850_status(void)
42 {
43 return inb(STATPORT);
44 }
45
46 #define input_avail() (uart6850_status()&INPUT_AVAIL)
47 #define output_ready() (uart6850_status()&OUTPUT_READY)
48
49 static void uart6850_cmd(unsigned char cmd)
50 {
51 outb(cmd, COMDPORT);
52 }
53
54 static int uart6850_read(void)
55 {
56 return inb(DATAPORT);
57 }
58
59 static void uart6850_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 void poll_uart6850(unsigned long dummy);
77
78
79 static struct timer_list uart6850_timer = {
80 function: poll_uart6850
81 };
82
83 static void uart6850_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 void m6850intr(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 void poll_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 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 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 return 0;
199 }
200 uart6850_write(midi_byte);
201 return 1;
202 }
203
204 static inline int uart6850_command(int dev, unsigned char *midi_byte)
205 {
206 return 1;
207 }
208
209 static inline int uart6850_start_read(int dev)
210 {
211 return 0;
212 }
213
214 static inline int uart6850_end_read(int dev)
215 {
216 return 0;
217 }
218
219 static inline void uart6850_kick(int dev)
220 {
221 }
222
223 static inline int uart6850_buffer_status(int dev)
224 {
225 return 0; /*
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 static inline int reset_uart6850(void)
287 {
288 uart6850_read();
289 return 1; /*
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 return 0;
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 return 0;
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 return 1;
361 }
362 __setup("uart6850=", setup_uart6850);
363 #endif
364
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