--- /dev/null
+/*
+ * 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");
Code Review / kvmfornfv.git / blobdiff