1 files changed, 361 insertions, 0 deletions
diff --git a/sound/oss/uart6850.c b/sound/oss/uart6850.c
new file mode 100644
index 00000000..f3f914aa
--- /dev/null
+++ b/sound/oss/uart6850.c
@@ -0,0 +1,361 @@
+/*
+ * sound/oss/uart6850.c
+ *
+ *
+ * Copyright (C) by Hannu Savolainen 1993-1997
+ *
+ * OSS/Free for Linux is distributed under the GNU GENERAL PUBLIC LICENSE (GPL)
+ * Version 2 (June 1991). See the "COPYING" file distributed with this software
+ * for more info.
+ * Extended by Alan Cox for Red Hat Software. Now a loadable MIDI driver.
+ * 28/4/97 - (C) Copyright Alan Cox. Released under the GPL version 2.
+ *
+ * Alan Cox:		Updated for new modular code. Removed snd_* irq handling. Now
+ *			uses native linux resources
+ * Christoph Hellwig:	Adapted to module_init/module_exit
+ * Jeff Garzik:		Made it work again, in theory
+ *			FIXME: If the request_irq() succeeds, the probe succeeds. Ug.
+ *
+ *	Status: Testing required (no shit -jgarzik)
+ *
+ *
+ */
+
+#include <linux/init.h>
+#include <linux/interrupt.h>
+#include <linux/module.h>
+#include <linux/spinlock.h>
+/* Mon Nov 22 22:38:35 MET 1993 marco@driq.home.usn.nl:
+ *      added 6850 support, used with COVOX SoundMaster II and custom cards.
+ */
+
+#include "sound_config.h"
+
+static int uart6850_base = 0x330;
+
+static int *uart6850_osp;
+
+#define	DATAPORT   (uart6850_base)
+#define	COMDPORT   (uart6850_base+1)
+#define	STATPORT   (uart6850_base+1)
+
+static int uart6850_status(void)
+{
+	return inb(STATPORT);
+}
+
+#define input_avail()		(uart6850_status()&INPUT_AVAIL)
+#define output_ready()		(uart6850_status()&OUTPUT_READY)
+
+static void uart6850_cmd(unsigned char cmd)
+{
+	outb(cmd, COMDPORT);
+}
+
+static int uart6850_read(void)
+{
+	return inb(DATAPORT);
+}
+
+static void uart6850_write(unsigned char byte)
+{
+	outb(byte, DATAPORT);
+}
+
+#define	OUTPUT_READY	0x02	/* Mask for data ready Bit */
+#define	INPUT_AVAIL	0x01	/* Mask for Data Send Ready Bit */
+
+#define	UART_RESET	0x95
+#define	UART_MODE_ON	0x03
+
+static int uart6850_opened;
+static int uart6850_irq;
+static int uart6850_detected;
+static int my_dev;
+static DEFINE_SPINLOCK(lock);
+
+static void (*midi_input_intr) (int dev, unsigned char data);
+static void poll_uart6850(unsigned long dummy);
+
+
+static DEFINE_TIMER(uart6850_timer, poll_uart6850, 0, 0);
+
+static void uart6850_input_loop(void)
+{
+	int count = 10;
+
+	while (count)
+	{
+		/*
+		 * Not timed out
+		 */
+		if (input_avail())
+		{
+			unsigned char c = uart6850_read();
+			count = 100;
+			if (uart6850_opened & OPEN_READ)
+				midi_input_intr(my_dev, c);
+		}
+		else
+		{
+			while (!input_avail() && count)
+				count--;
+		}
+	}
+}
+
+static irqreturn_t m6850intr(int irq, void *dev_id)
+{
+	if (input_avail())
+		uart6850_input_loop();
+	return IRQ_HANDLED;
+}
+
+/*
+ *	It looks like there is no input interrupts in the UART mode. Let's try
+ *	polling.
+ */
+
+static void poll_uart6850(unsigned long dummy)
+{
+	unsigned long flags;
+
+	if (!(uart6850_opened & OPEN_READ))
+		return;		/* Device has been closed */
+
+	spin_lock_irqsave(&lock,flags);
+	if (input_avail())
+		uart6850_input_loop();
+
+	uart6850_timer.expires = 1 + jiffies;
+	add_timer(&uart6850_timer);
+	
+	/*
+	 *	Come back later
+	 */
+
+	spin_unlock_irqrestore(&lock,flags);
+}
+
+static int uart6850_open(int dev, int mode,
+	      void            (*input) (int dev, unsigned char data),
+	      void            (*output) (int dev)
+)
+{
+	if (uart6850_opened)
+	{
+/*		  printk("Midi6850: Midi busy\n");*/
+		  return -EBUSY;
+	};
+
+	uart6850_cmd(UART_RESET);
+	uart6850_input_loop();
+	midi_input_intr = input;
+	uart6850_opened = mode;
+	poll_uart6850(0);	/*
+				 * Enable input polling
+				 */
+
+	return 0;
+}
+
+static void uart6850_close(int dev)
+{
+	uart6850_cmd(UART_MODE_ON);
+	del_timer(&uart6850_timer);
+	uart6850_opened = 0;
+}
+
+static int uart6850_out(int dev, unsigned char midi_byte)
+{
+	int timeout;
+	unsigned long flags;
+
+	/*
+	 * Test for input since pending input seems to block the output.
+	 */
+
+	spin_lock_irqsave(&lock,flags);
+
+	if (input_avail())
+		uart6850_input_loop();
+
+	spin_unlock_irqrestore(&lock,flags);
+
+	/*
+	 * Sometimes it takes about 13000 loops before the output becomes ready
+	 * (After reset). Normally it takes just about 10 loops.
+	 */
+
+	for (timeout = 30000; timeout > 0 && !output_ready(); timeout--);	/*
+										 * Wait
+										 */
+	if (!output_ready())
+	{
+		printk(KERN_WARNING "Midi6850: Timeout\n");
+		return 0;
+	}
+	uart6850_write(midi_byte);
+	return 1;
+}
+
+static inline int uart6850_command(int dev, unsigned char *midi_byte)
+{
+	return 1;
+}
+
+static inline int uart6850_start_read(int dev)
+{
+	return 0;
+}
+
+static inline int uart6850_end_read(int dev)
+{
+	return 0;
+}
+
+static inline void uart6850_kick(int dev)
+{
+}
+
+static inline int uart6850_buffer_status(int dev)
+{
+	return 0;		/*
+				 * No data in buffers
+				 */
+}
+
+#define MIDI_SYNTH_NAME	"6850 UART Midi"
+#define MIDI_SYNTH_CAPS	SYNTH_CAP_INPUT
+#include "midi_synth.h"
+
+static struct midi_operations uart6850_operations =
+{
+	.owner		= THIS_MODULE,
+	.info		= {"6850 UART", 0, 0, SNDCARD_UART6850},
+	.converter	= &std_midi_synth,
+	.in_info	= {0},
+	.open		= uart6850_open,
+	.close		= uart6850_close,
+	.outputc	= uart6850_out,
+	.start_read	= uart6850_start_read,
+	.end_read	= uart6850_end_read,
+	.kick		= uart6850_kick,
+	.command	= uart6850_command,
+	.buffer_status	= uart6850_buffer_status
+};
+
+
+static void __init attach_uart6850(struct address_info *hw_config)
+{
+	int ok, timeout;
+	unsigned long   flags;
+
+	if (!uart6850_detected)
+		return;
+
+	if ((my_dev = sound_alloc_mididev()) == -1)
+	{
+		printk(KERN_INFO "uart6850: Too many midi devices detected\n");
+		return;
+	}
+	uart6850_base = hw_config->io_base;
+	uart6850_osp = hw_config->osp;
+	uart6850_irq = hw_config->irq;
+
+	spin_lock_irqsave(&lock,flags);
+
+	for (timeout = 30000; timeout > 0 && !output_ready(); timeout--);	/*
+										 * Wait
+										 */
+	uart6850_cmd(UART_MODE_ON);
+	ok = 1;
+	spin_unlock_irqrestore(&lock,flags);
+
+	conf_printf("6850 Midi Interface", hw_config);
+
+	std_midi_synth.midi_dev = my_dev;
+	hw_config->slots[4] = my_dev;
+	midi_devs[my_dev] = &uart6850_operations;
+	sequencer_init();
+}
+
+static inline int reset_uart6850(void)
+{
+	uart6850_read();
+	return 1;		/*
+				 * OK
+				 */
+}
+
+static int __init probe_uart6850(struct address_info *hw_config)
+{
+	int ok;
+
+	uart6850_osp = hw_config->osp;
+	uart6850_base = hw_config->io_base;
+	uart6850_irq = hw_config->irq;
+
+	if (request_irq(uart6850_irq, m6850intr, 0, "MIDI6850", NULL) < 0)
+		return 0;
+
+	ok = reset_uart6850();
+	uart6850_detected = ok;
+	return ok;
+}
+
+static void __exit unload_uart6850(struct address_info *hw_config)
+{
+	free_irq(hw_config->irq, NULL);
+	sound_unload_mididev(hw_config->slots[4]);
+}
+
+static struct address_info cfg_mpu;
+
+static int __initdata io = -1;
+static int __initdata irq = -1;
+
+module_param(io, int, 0);
+module_param(irq, int, 0);
+
+static int __init init_uart6850(void)
+{
+	cfg_mpu.io_base = io;
+	cfg_mpu.irq = irq;
+
+	if (cfg_mpu.io_base == -1 || cfg_mpu.irq == -1) {
+		printk(KERN_INFO "uart6850: irq and io must be set.\n");
+		return -EINVAL;
+	}
+
+	if (probe_uart6850(&cfg_mpu))
+		return -ENODEV;
+	attach_uart6850(&cfg_mpu);
+
+	return 0;
+}
+
+static void __exit cleanup_uart6850(void)
+{
+	unload_uart6850(&cfg_mpu);
+}
+
+module_init(init_uart6850);
+module_exit(cleanup_uart6850);
+
+#ifndef MODULE
+static int __init setup_uart6850(char *str)
+{
+	/* io, irq */
+	int ints[3];
+	
+	str = get_options(str, ARRAY_SIZE(ints), ints);
+	
+	io = ints[1];
+	irq = ints[2];
+
+	return 1;
+}
+__setup("uart6850=", setup_uart6850);
+#endif
+MODULE_LICENSE("GPL");