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Diffstat (limited to 'kernel/sound/oss/uart6850.c')
| -rw-r--r-- | kernel/sound/oss/uart6850.c | 361 |
1 files changed, 361 insertions, 0 deletions
diff --git a/kernel/sound/oss/uart6850.c b/kernel/sound/oss/uart6850.c new file mode 100644 index 000000000..1079133dd --- /dev/null +++ b/kernel/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"); |