--- /dev/null
+/*
+ * Copyright (c) by Jaroslav Kysela <perex@perex.cz>
+ * Routines for control of MPU-401 in UART mode
+ *
+ * MPU-401 supports UART mode which is not capable generate transmit
+ * interrupts thus output is done via polling. Without interrupt,
+ * input is done also via polling. Do not expect good performance.
+ *
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
+ *
+ * 13-03-2003:
+ * Added support for different kind of hardware I/O. Build in choices
+ * are port and mmio. For other kind of I/O, set mpu->read and
+ * mpu->write to your own I/O functions.
+ *
+ */
+
+#include <linux/io.h>
+#include <linux/delay.h>
+#include <linux/init.h>
+#include <linux/slab.h>
+#include <linux/ioport.h>
+#include <linux/module.h>
+#include <linux/interrupt.h>
+#include <linux/errno.h>
+#include <sound/core.h>
+#include <sound/mpu401.h>
+
+MODULE_AUTHOR("Jaroslav Kysela <perex@perex.cz>");
+MODULE_DESCRIPTION("Routines for control of MPU-401 in UART mode");
+MODULE_LICENSE("GPL");
+
+static void snd_mpu401_uart_input_read(struct snd_mpu401 * mpu);
+static void snd_mpu401_uart_output_write(struct snd_mpu401 * mpu);
+
+/*
+
+ */
+
+#define snd_mpu401_input_avail(mpu) \
+ (!(mpu->read(mpu, MPU401C(mpu)) & MPU401_RX_EMPTY))
+#define snd_mpu401_output_ready(mpu) \
+ (!(mpu->read(mpu, MPU401C(mpu)) & MPU401_TX_FULL))
+
+/* Build in lowlevel io */
+static void mpu401_write_port(struct snd_mpu401 *mpu, unsigned char data,
+ unsigned long addr)
+{
+ outb(data, addr);
+}
+
+static unsigned char mpu401_read_port(struct snd_mpu401 *mpu,
+ unsigned long addr)
+{
+ return inb(addr);
+}
+
+static void mpu401_write_mmio(struct snd_mpu401 *mpu, unsigned char data,
+ unsigned long addr)
+{
+ writeb(data, (void __iomem *)addr);
+}
+
+static unsigned char mpu401_read_mmio(struct snd_mpu401 *mpu,
+ unsigned long addr)
+{
+ return readb((void __iomem *)addr);
+}
+/* */
+
+static void snd_mpu401_uart_clear_rx(struct snd_mpu401 *mpu)
+{
+ int timeout = 100000;
+ for (; timeout > 0 && snd_mpu401_input_avail(mpu); timeout--)
+ mpu->read(mpu, MPU401D(mpu));
+#ifdef CONFIG_SND_DEBUG
+ if (timeout <= 0)
+ snd_printk(KERN_ERR "cmd: clear rx timeout (status = 0x%x)\n",
+ mpu->read(mpu, MPU401C(mpu)));
+#endif
+}
+
+static void uart_interrupt_tx(struct snd_mpu401 *mpu)
+{
+ unsigned long flags;
+
+ if (test_bit(MPU401_MODE_BIT_OUTPUT, &mpu->mode) &&
+ test_bit(MPU401_MODE_BIT_OUTPUT_TRIGGER, &mpu->mode)) {
+ spin_lock_irqsave(&mpu->output_lock, flags);
+ snd_mpu401_uart_output_write(mpu);
+ spin_unlock_irqrestore(&mpu->output_lock, flags);
+ }
+}
+
+static void _snd_mpu401_uart_interrupt(struct snd_mpu401 *mpu)
+{
+ unsigned long flags;
+
+ if (mpu->info_flags & MPU401_INFO_INPUT) {
+ spin_lock_irqsave(&mpu->input_lock, flags);
+ if (test_bit(MPU401_MODE_BIT_INPUT, &mpu->mode))
+ snd_mpu401_uart_input_read(mpu);
+ else
+ snd_mpu401_uart_clear_rx(mpu);
+ spin_unlock_irqrestore(&mpu->input_lock, flags);
+ }
+ if (! (mpu->info_flags & MPU401_INFO_TX_IRQ))
+ /* ok. for better Tx performance try do some output
+ when input is done */
+ uart_interrupt_tx(mpu);
+}
+
+/**
+ * snd_mpu401_uart_interrupt - generic MPU401-UART interrupt handler
+ * @irq: the irq number
+ * @dev_id: mpu401 instance
+ *
+ * Processes the interrupt for MPU401-UART i/o.
+ *
+ * Return: %IRQ_HANDLED if the interrupt was handled. %IRQ_NONE otherwise.
+ */
+irqreturn_t snd_mpu401_uart_interrupt(int irq, void *dev_id)
+{
+ struct snd_mpu401 *mpu = dev_id;
+
+ if (mpu == NULL)
+ return IRQ_NONE;
+ _snd_mpu401_uart_interrupt(mpu);
+ return IRQ_HANDLED;
+}
+
+EXPORT_SYMBOL(snd_mpu401_uart_interrupt);
+
+/**
+ * snd_mpu401_uart_interrupt_tx - generic MPU401-UART transmit irq handler
+ * @irq: the irq number
+ * @dev_id: mpu401 instance
+ *
+ * Processes the interrupt for MPU401-UART output.
+ *
+ * Return: %IRQ_HANDLED if the interrupt was handled. %IRQ_NONE otherwise.
+ */
+irqreturn_t snd_mpu401_uart_interrupt_tx(int irq, void *dev_id)
+{
+ struct snd_mpu401 *mpu = dev_id;
+
+ if (mpu == NULL)
+ return IRQ_NONE;
+ uart_interrupt_tx(mpu);
+ return IRQ_HANDLED;
+}
+
+EXPORT_SYMBOL(snd_mpu401_uart_interrupt_tx);
+
+/*
+ * timer callback
+ * reprogram the timer and call the interrupt job
+ */
+static void snd_mpu401_uart_timer(unsigned long data)
+{
+ struct snd_mpu401 *mpu = (struct snd_mpu401 *)data;
+ unsigned long flags;
+
+ spin_lock_irqsave(&mpu->timer_lock, flags);
+ /*mpu->mode |= MPU401_MODE_TIMER;*/
+ mod_timer(&mpu->timer, 1 + jiffies);
+ spin_unlock_irqrestore(&mpu->timer_lock, flags);
+ if (mpu->rmidi)
+ _snd_mpu401_uart_interrupt(mpu);
+}
+
+/*
+ * initialize the timer callback if not programmed yet
+ */
+static void snd_mpu401_uart_add_timer (struct snd_mpu401 *mpu, int input)
+{
+ unsigned long flags;
+
+ spin_lock_irqsave (&mpu->timer_lock, flags);
+ if (mpu->timer_invoked == 0) {
+ setup_timer(&mpu->timer, snd_mpu401_uart_timer,
+ (unsigned long)mpu);
+ mod_timer(&mpu->timer, 1 + jiffies);
+ }
+ mpu->timer_invoked |= input ? MPU401_MODE_INPUT_TIMER :
+ MPU401_MODE_OUTPUT_TIMER;
+ spin_unlock_irqrestore (&mpu->timer_lock, flags);
+}
+
+/*
+ * remove the timer callback if still active
+ */
+static void snd_mpu401_uart_remove_timer (struct snd_mpu401 *mpu, int input)
+{
+ unsigned long flags;
+
+ spin_lock_irqsave (&mpu->timer_lock, flags);
+ if (mpu->timer_invoked) {
+ mpu->timer_invoked &= input ? ~MPU401_MODE_INPUT_TIMER :
+ ~MPU401_MODE_OUTPUT_TIMER;
+ if (! mpu->timer_invoked)
+ del_timer(&mpu->timer);
+ }
+ spin_unlock_irqrestore (&mpu->timer_lock, flags);
+}
+
+/*
+ * send a UART command
+ * return zero if successful, non-zero for some errors
+ */
+
+static int snd_mpu401_uart_cmd(struct snd_mpu401 * mpu, unsigned char cmd,
+ int ack)
+{
+ unsigned long flags;
+ int timeout, ok;
+
+ spin_lock_irqsave(&mpu->input_lock, flags);
+ if (mpu->hardware != MPU401_HW_TRID4DWAVE) {
+ mpu->write(mpu, 0x00, MPU401D(mpu));
+ /*snd_mpu401_uart_clear_rx(mpu);*/
+ }
+ /* ok. standard MPU-401 initialization */
+ if (mpu->hardware != MPU401_HW_SB) {
+ for (timeout = 1000; timeout > 0 &&
+ !snd_mpu401_output_ready(mpu); timeout--)
+ udelay(10);
+#ifdef CONFIG_SND_DEBUG
+ if (!timeout)
+ snd_printk(KERN_ERR "cmd: tx timeout (status = 0x%x)\n",
+ mpu->read(mpu, MPU401C(mpu)));
+#endif
+ }
+ mpu->write(mpu, cmd, MPU401C(mpu));
+ if (ack && !(mpu->info_flags & MPU401_INFO_NO_ACK)) {
+ ok = 0;
+ timeout = 10000;
+ while (!ok && timeout-- > 0) {
+ if (snd_mpu401_input_avail(mpu)) {
+ if (mpu->read(mpu, MPU401D(mpu)) == MPU401_ACK)
+ ok = 1;
+ }
+ }
+ if (!ok && mpu->read(mpu, MPU401D(mpu)) == MPU401_ACK)
+ ok = 1;
+ } else
+ ok = 1;
+ spin_unlock_irqrestore(&mpu->input_lock, flags);
+ if (!ok) {
+ snd_printk(KERN_ERR "cmd: 0x%x failed at 0x%lx "
+ "(status = 0x%x, data = 0x%x)\n", cmd, mpu->port,
+ mpu->read(mpu, MPU401C(mpu)),
+ mpu->read(mpu, MPU401D(mpu)));
+ return 1;
+ }
+ return 0;
+}
+
+static int snd_mpu401_do_reset(struct snd_mpu401 *mpu)
+{
+ if (snd_mpu401_uart_cmd(mpu, MPU401_RESET, 1))
+ return -EIO;
+ if (snd_mpu401_uart_cmd(mpu, MPU401_ENTER_UART, 0))
+ return -EIO;
+ return 0;
+}
+
+/*
+ * input/output open/close - protected by open_mutex in rawmidi.c
+ */
+static int snd_mpu401_uart_input_open(struct snd_rawmidi_substream *substream)
+{
+ struct snd_mpu401 *mpu;
+ int err;
+
+ mpu = substream->rmidi->private_data;
+ if (mpu->open_input && (err = mpu->open_input(mpu)) < 0)
+ return err;
+ if (! test_bit(MPU401_MODE_BIT_OUTPUT, &mpu->mode)) {
+ if (snd_mpu401_do_reset(mpu) < 0)
+ goto error_out;
+ }
+ mpu->substream_input = substream;
+ set_bit(MPU401_MODE_BIT_INPUT, &mpu->mode);
+ return 0;
+
+error_out:
+ if (mpu->open_input && mpu->close_input)
+ mpu->close_input(mpu);
+ return -EIO;
+}
+
+static int snd_mpu401_uart_output_open(struct snd_rawmidi_substream *substream)
+{
+ struct snd_mpu401 *mpu;
+ int err;
+
+ mpu = substream->rmidi->private_data;
+ if (mpu->open_output && (err = mpu->open_output(mpu)) < 0)
+ return err;
+ if (! test_bit(MPU401_MODE_BIT_INPUT, &mpu->mode)) {
+ if (snd_mpu401_do_reset(mpu) < 0)
+ goto error_out;
+ }
+ mpu->substream_output = substream;
+ set_bit(MPU401_MODE_BIT_OUTPUT, &mpu->mode);
+ return 0;
+
+error_out:
+ if (mpu->open_output && mpu->close_output)
+ mpu->close_output(mpu);
+ return -EIO;
+}
+
+static int snd_mpu401_uart_input_close(struct snd_rawmidi_substream *substream)
+{
+ struct snd_mpu401 *mpu;
+ int err = 0;
+
+ mpu = substream->rmidi->private_data;
+ clear_bit(MPU401_MODE_BIT_INPUT, &mpu->mode);
+ mpu->substream_input = NULL;
+ if (! test_bit(MPU401_MODE_BIT_OUTPUT, &mpu->mode))
+ err = snd_mpu401_uart_cmd(mpu, MPU401_RESET, 0);
+ if (mpu->close_input)
+ mpu->close_input(mpu);
+ if (err)
+ return -EIO;
+ return 0;
+}
+
+static int snd_mpu401_uart_output_close(struct snd_rawmidi_substream *substream)
+{
+ struct snd_mpu401 *mpu;
+ int err = 0;
+
+ mpu = substream->rmidi->private_data;
+ clear_bit(MPU401_MODE_BIT_OUTPUT, &mpu->mode);
+ mpu->substream_output = NULL;
+ if (! test_bit(MPU401_MODE_BIT_INPUT, &mpu->mode))
+ err = snd_mpu401_uart_cmd(mpu, MPU401_RESET, 0);
+ if (mpu->close_output)
+ mpu->close_output(mpu);
+ if (err)
+ return -EIO;
+ return 0;
+}
+
+/*
+ * trigger input callback
+ */
+static void
+snd_mpu401_uart_input_trigger(struct snd_rawmidi_substream *substream, int up)
+{
+ unsigned long flags;
+ struct snd_mpu401 *mpu;
+ int max = 64;
+
+ mpu = substream->rmidi->private_data;
+ if (up) {
+ if (! test_and_set_bit(MPU401_MODE_BIT_INPUT_TRIGGER,
+ &mpu->mode)) {
+ /* first time - flush FIFO */
+ while (max-- > 0)
+ mpu->read(mpu, MPU401D(mpu));
+ if (mpu->info_flags & MPU401_INFO_USE_TIMER)
+ snd_mpu401_uart_add_timer(mpu, 1);
+ }
+
+ /* read data in advance */
+ spin_lock_irqsave(&mpu->input_lock, flags);
+ snd_mpu401_uart_input_read(mpu);
+ spin_unlock_irqrestore(&mpu->input_lock, flags);
+ } else {
+ if (mpu->info_flags & MPU401_INFO_USE_TIMER)
+ snd_mpu401_uart_remove_timer(mpu, 1);
+ clear_bit(MPU401_MODE_BIT_INPUT_TRIGGER, &mpu->mode);
+ }
+
+}
+
+/*
+ * transfer input pending data
+ * call with input_lock spinlock held
+ */
+static void snd_mpu401_uart_input_read(struct snd_mpu401 * mpu)
+{
+ int max = 128;
+ unsigned char byte;
+
+ while (max-- > 0) {
+ if (! snd_mpu401_input_avail(mpu))
+ break; /* input not available */
+ byte = mpu->read(mpu, MPU401D(mpu));
+ if (test_bit(MPU401_MODE_BIT_INPUT_TRIGGER, &mpu->mode))
+ snd_rawmidi_receive(mpu->substream_input, &byte, 1);
+ }
+}
+
+/*
+ * Tx FIFO sizes:
+ * CS4237B - 16 bytes
+ * AudioDrive ES1688 - 12 bytes
+ * S3 SonicVibes - 8 bytes
+ * SoundBlaster AWE 64 - 2 bytes (ugly hardware)
+ */
+
+/*
+ * write output pending bytes
+ * call with output_lock spinlock held
+ */
+static void snd_mpu401_uart_output_write(struct snd_mpu401 * mpu)
+{
+ unsigned char byte;
+ int max = 256;
+
+ do {
+ if (snd_rawmidi_transmit_peek(mpu->substream_output,
+ &byte, 1) == 1) {
+ /*
+ * Try twice because there is hardware that insists on
+ * setting the output busy bit after each write.
+ */
+ if (!snd_mpu401_output_ready(mpu) &&
+ !snd_mpu401_output_ready(mpu))
+ break; /* Tx FIFO full - try again later */
+ mpu->write(mpu, byte, MPU401D(mpu));
+ snd_rawmidi_transmit_ack(mpu->substream_output, 1);
+ } else {
+ snd_mpu401_uart_remove_timer (mpu, 0);
+ break; /* no other data - leave the tx loop */
+ }
+ } while (--max > 0);
+}
+
+/*
+ * output trigger callback
+ */
+static void
+snd_mpu401_uart_output_trigger(struct snd_rawmidi_substream *substream, int up)
+{
+ unsigned long flags;
+ struct snd_mpu401 *mpu;
+
+ mpu = substream->rmidi->private_data;
+ if (up) {
+ set_bit(MPU401_MODE_BIT_OUTPUT_TRIGGER, &mpu->mode);
+
+ /* try to add the timer at each output trigger,
+ * since the output timer might have been removed in
+ * snd_mpu401_uart_output_write().
+ */
+ if (! (mpu->info_flags & MPU401_INFO_TX_IRQ))
+ snd_mpu401_uart_add_timer(mpu, 0);
+
+ /* output pending data */
+ spin_lock_irqsave(&mpu->output_lock, flags);
+ snd_mpu401_uart_output_write(mpu);
+ spin_unlock_irqrestore(&mpu->output_lock, flags);
+ } else {
+ if (! (mpu->info_flags & MPU401_INFO_TX_IRQ))
+ snd_mpu401_uart_remove_timer(mpu, 0);
+ clear_bit(MPU401_MODE_BIT_OUTPUT_TRIGGER, &mpu->mode);
+ }
+}
+
+/*
+
+ */
+
+static struct snd_rawmidi_ops snd_mpu401_uart_output =
+{
+ .open = snd_mpu401_uart_output_open,
+ .close = snd_mpu401_uart_output_close,
+ .trigger = snd_mpu401_uart_output_trigger,
+};
+
+static struct snd_rawmidi_ops snd_mpu401_uart_input =
+{
+ .open = snd_mpu401_uart_input_open,
+ .close = snd_mpu401_uart_input_close,
+ .trigger = snd_mpu401_uart_input_trigger,
+};
+
+static void snd_mpu401_uart_free(struct snd_rawmidi *rmidi)
+{
+ struct snd_mpu401 *mpu = rmidi->private_data;
+ if (mpu->irq >= 0)
+ free_irq(mpu->irq, (void *) mpu);
+ release_and_free_resource(mpu->res);
+ kfree(mpu);
+}
+
+/**
+ * snd_mpu401_uart_new - create an MPU401-UART instance
+ * @card: the card instance
+ * @device: the device index, zero-based
+ * @hardware: the hardware type, MPU401_HW_XXXX
+ * @port: the base address of MPU401 port
+ * @info_flags: bitflags MPU401_INFO_XXX
+ * @irq: the ISA irq number, -1 if not to be allocated
+ * @rrawmidi: the pointer to store the new rawmidi instance
+ *
+ * Creates a new MPU-401 instance.
+ *
+ * Note that the rawmidi instance is returned on the rrawmidi argument,
+ * not the mpu401 instance itself. To access to the mpu401 instance,
+ * cast from rawmidi->private_data (with struct snd_mpu401 magic-cast).
+ *
+ * Return: Zero if successful, or a negative error code.
+ */
+int snd_mpu401_uart_new(struct snd_card *card, int device,
+ unsigned short hardware,
+ unsigned long port,
+ unsigned int info_flags,
+ int irq,
+ struct snd_rawmidi ** rrawmidi)
+{
+ struct snd_mpu401 *mpu;
+ struct snd_rawmidi *rmidi;
+ int in_enable, out_enable;
+ int err;
+
+ if (rrawmidi)
+ *rrawmidi = NULL;
+ if (! (info_flags & (MPU401_INFO_INPUT | MPU401_INFO_OUTPUT)))
+ info_flags |= MPU401_INFO_INPUT | MPU401_INFO_OUTPUT;
+ in_enable = (info_flags & MPU401_INFO_INPUT) ? 1 : 0;
+ out_enable = (info_flags & MPU401_INFO_OUTPUT) ? 1 : 0;
+ if ((err = snd_rawmidi_new(card, "MPU-401U", device,
+ out_enable, in_enable, &rmidi)) < 0)
+ return err;
+ mpu = kzalloc(sizeof(*mpu), GFP_KERNEL);
+ if (mpu == NULL) {
+ snd_printk(KERN_ERR "mpu401_uart: cannot allocate\n");
+ snd_device_free(card, rmidi);
+ return -ENOMEM;
+ }
+ rmidi->private_data = mpu;
+ rmidi->private_free = snd_mpu401_uart_free;
+ spin_lock_init(&mpu->input_lock);
+ spin_lock_init(&mpu->output_lock);
+ spin_lock_init(&mpu->timer_lock);
+ mpu->hardware = hardware;
+ mpu->irq = -1;
+ if (! (info_flags & MPU401_INFO_INTEGRATED)) {
+ int res_size = hardware == MPU401_HW_PC98II ? 4 : 2;
+ mpu->res = request_region(port, res_size, "MPU401 UART");
+ if (mpu->res == NULL) {
+ snd_printk(KERN_ERR "mpu401_uart: "
+ "unable to grab port 0x%lx size %d\n",
+ port, res_size);
+ snd_device_free(card, rmidi);
+ return -EBUSY;
+ }
+ }
+ if (info_flags & MPU401_INFO_MMIO) {
+ mpu->write = mpu401_write_mmio;
+ mpu->read = mpu401_read_mmio;
+ } else {
+ mpu->write = mpu401_write_port;
+ mpu->read = mpu401_read_port;
+ }
+ mpu->port = port;
+ if (hardware == MPU401_HW_PC98II)
+ mpu->cport = port + 2;
+ else
+ mpu->cport = port + 1;
+ if (irq >= 0) {
+ if (request_irq(irq, snd_mpu401_uart_interrupt, 0,
+ "MPU401 UART", (void *) mpu)) {
+ snd_printk(KERN_ERR "mpu401_uart: "
+ "unable to grab IRQ %d\n", irq);
+ snd_device_free(card, rmidi);
+ return -EBUSY;
+ }
+ }
+ if (irq < 0 && !(info_flags & MPU401_INFO_IRQ_HOOK))
+ info_flags |= MPU401_INFO_USE_TIMER;
+ mpu->info_flags = info_flags;
+ mpu->irq = irq;
+ if (card->shortname[0])
+ snprintf(rmidi->name, sizeof(rmidi->name), "%s MIDI",
+ card->shortname);
+ else
+ sprintf(rmidi->name, "MPU-401 MIDI %d-%d",card->number, device);
+ if (out_enable) {
+ snd_rawmidi_set_ops(rmidi, SNDRV_RAWMIDI_STREAM_OUTPUT,
+ &snd_mpu401_uart_output);
+ rmidi->info_flags |= SNDRV_RAWMIDI_INFO_OUTPUT;
+ }
+ if (in_enable) {
+ snd_rawmidi_set_ops(rmidi, SNDRV_RAWMIDI_STREAM_INPUT,
+ &snd_mpu401_uart_input);
+ rmidi->info_flags |= SNDRV_RAWMIDI_INFO_INPUT;
+ if (out_enable)
+ rmidi->info_flags |= SNDRV_RAWMIDI_INFO_DUPLEX;
+ }
+ mpu->rmidi = rmidi;
+ if (rrawmidi)
+ *rrawmidi = rmidi;
+ return 0;
+}
+
+EXPORT_SYMBOL(snd_mpu401_uart_new);
+
+/*
+ * INIT part
+ */
+
+static int __init alsa_mpu401_uart_init(void)
+{
+ return 0;
+}
+
+static void __exit alsa_mpu401_uart_exit(void)
+{
+}
+
+module_init(alsa_mpu401_uart_init)
+module_exit(alsa_mpu401_uart_exit)
Code Review / kvmfornfv.git / blobdiff