5 * Copyright (C) by Hannu Savolainen 1993-1997
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
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.
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.
19 * Status: Testing required (no shit -jgarzik)
24 #include <linux/init.h>
25 #include <linux/module.h>
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.
31 #include "sound_config.h"
33 static int uart6850_base = 0x330;
35 static int *uart6850_osp;
37 #define DATAPORT (uart6850_base)
38 #define COMDPORT (uart6850_base+1)
39 #define STATPORT (uart6850_base+1)
41 static int uart6850_status(void)
46 #define input_avail() (uart6850_status()&INPUT_AVAIL)
47 #define output_ready() (uart6850_status()&OUTPUT_READY)
49 static void uart6850_cmd(unsigned char cmd)
54 static int uart6850_read(void)
59 static void uart6850_write(unsigned char byte)
64 #define OUTPUT_READY 0x02 /* Mask for data ready Bit */
65 #define INPUT_AVAIL 0x01 /* Mask for Data Send Ready Bit */
67 #define UART_RESET 0x95
68 #define UART_MODE_ON 0x03
70 static int uart6850_opened;
71 static int uart6850_irq;
72 static int uart6850_detected;
75 static void (*midi_input_intr) (int dev, unsigned char data);
76 static void poll_uart6850(unsigned long dummy);
79 static struct timer_list uart6850_timer = {
80 function: poll_uart6850
83 static void uart6850_input_loop(void)
94 unsigned char c = uart6850_read();
96 if (uart6850_opened & OPEN_READ)
97 midi_input_intr(my_dev, c);
101 while (!input_avail() && count)
107 void m6850intr(int irq, void *dev_id, struct pt_regs *dummy)
110 uart6850_input_loop();
114 * It looks like there is no input interrupts in the UART mode. Let's try
118 static void poll_uart6850(unsigned long dummy)
122 if (!(uart6850_opened & OPEN_READ))
123 return; /* Device has been closed */
129 uart6850_input_loop();
131 uart6850_timer.expires = 1 + jiffies;
132 add_timer(&uart6850_timer);
138 restore_flags(flags);
141 static int uart6850_open(int dev, int mode,
142 void (*input) (int dev, unsigned char data),
143 void (*output) (int dev)
148 /* printk("Midi6850: Midi busy\n");*/
152 uart6850_cmd(UART_RESET);
153 uart6850_input_loop();
154 midi_input_intr = input;
155 uart6850_opened = mode;
157 * Enable input polling
163 static void uart6850_close(int dev)
165 uart6850_cmd(UART_MODE_ON);
166 del_timer(&uart6850_timer);
170 static int uart6850_out(int dev, unsigned char midi_byte)
176 * Test for input since pending input seems to block the output.
183 uart6850_input_loop();
185 restore_flags(flags);
188 * Sometimes it takes about 13000 loops before the output becomes ready
189 * (After reset). Normally it takes just about 10 loops.
192 for (timeout = 30000; timeout > 0 && !output_ready(); timeout--); /*
197 printk(KERN_WARNING "Midi6850: Timeout\n");
200 uart6850_write(midi_byte);
204 static inline int uart6850_command(int dev, unsigned char *midi_byte)
209 static inline int uart6850_start_read(int dev)
214 static inline int uart6850_end_read(int dev)
219 static inline void uart6850_kick(int dev)
223 static inline int uart6850_buffer_status(int dev)
230 #define MIDI_SYNTH_NAME "6850 UART Midi"
231 #define MIDI_SYNTH_CAPS SYNTH_CAP_INPUT
232 #include "midi_synth.h"
234 static struct midi_operations uart6850_operations =
237 info: {"6850 UART", 0, 0, SNDCARD_UART6850},
238 converter: &std_midi_synth,
241 close: uart6850_close,
242 outputc: uart6850_out,
243 start_read: uart6850_start_read,
244 end_read: uart6850_end_read,
246 command: uart6850_command,
247 buffer_status: uart6850_buffer_status
251 static void __init attach_uart6850(struct address_info *hw_config)
256 if (!uart6850_detected)
259 if ((my_dev = sound_alloc_mididev()) == -1)
261 printk(KERN_INFO "uart6850: Too many midi devices detected\n");
264 uart6850_base = hw_config->io_base;
265 uart6850_osp = hw_config->osp;
266 uart6850_irq = hw_config->irq;
271 for (timeout = 30000; timeout > 0 && !output_ready(); timeout--); /*
274 uart6850_cmd(UART_MODE_ON);
276 restore_flags(flags);
278 conf_printf("6850 Midi Interface", hw_config);
280 std_midi_synth.midi_dev = my_dev;
281 hw_config->slots[4] = my_dev;
282 midi_devs[my_dev] = &uart6850_operations;
286 static inline int reset_uart6850(void)
294 static int __init probe_uart6850(struct address_info *hw_config)
298 uart6850_osp = hw_config->osp;
299 uart6850_base = hw_config->io_base;
300 uart6850_irq = hw_config->irq;
302 if (request_irq(uart6850_irq, m6850intr, 0, "MIDI6850", NULL) < 0)
305 ok = reset_uart6850();
306 uart6850_detected = ok;
310 static void __exit unload_uart6850(struct address_info *hw_config)
312 free_irq(hw_config->irq, NULL);
313 sound_unload_mididev(hw_config->slots[4]);
316 static struct address_info cfg_mpu;
318 static int __initdata io = -1;
319 static int __initdata irq = -1;
322 MODULE_PARM(irq,"i");
324 static int __init init_uart6850(void)
326 cfg_mpu.io_base = io;
329 if (cfg_mpu.io_base == -1 || cfg_mpu.irq == -1) {
330 printk(KERN_INFO "uart6850: irq and io must be set.\n");
334 if (probe_uart6850(&cfg_mpu))
336 attach_uart6850(&cfg_mpu);
341 static void __exit cleanup_uart6850(void)
343 unload_uart6850(&cfg_mpu);
346 module_init(init_uart6850);
347 module_exit(cleanup_uart6850);
350 static int __init setup_uart6850(char *str)
355 str = get_options(str, ARRAY_SIZE(ints), ints);
362 __setup("uart6850=", setup_uart6850);
364 MODULE_LICENSE("GPL");