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/*
* Copyright by George Hansper 1996
*
* Tue Jan 23 22:32:10 EST 1996 ghansper@daemon.apana.org.au
* added 16450/16550 support for standard serial-port UARTs
*
* Redistribution and use in source and binary forms, with or
* without modification, are permitted provided that the following
* conditions are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above
* copyright notice, this list of conditions and the following
* disclaimer in the documentation and/or other materials provided
* with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS
* IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
* FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
* AUTHOR OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
* (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
* WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
* NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*
*
* Wed Apl 1 02:25:30 JST 1998 zinnia@jan.ne.jp
* ported to FreeBSD 2.2.5R-RELEASE
*
* Fri Apl 1 21:16:20 JST 1999 zinnia@jan.ne.jp
* ported to FreeBSD 3.1-STABLE
*
*
* Ported to the new Audio Driver by Luigi Rizzo:
* (C) 1999 Seigo Tanimura
*
* This is the 16550 midi uart driver for FreeBSD, based on the Luigi Sound Driver.
* This handles io against /dev/midi, the midi {in, out}put event queues
* and the event/message transmittion to/from a serial port interface.
*
* $FreeBSD$
*
*/
#include <dev/sio/sioreg.h>
#include <dev/ic/ns16550.h>
#include <dev/sound/midi/midi.h>
/* XXX What about a PCI uart? */
#include <isa/isavar.h>
static devclass_t midi_devclass;
#ifndef DDB
#undef DDB
#define DDB(x)
#endif /* DDB */
#define TX_FIFO_SIZE 16
extern synthdev_info midisynth_op_desc;
/* These are the synthesizer and the midi interface information. */
static struct synth_info uartsio_synthinfo = {
"uart16550A MIDI",
0,
SYNTH_TYPE_MIDI,
0,
0,
128,
128,
128,
SYNTH_CAP_INPUT,
};
static struct midi_info uartsio_midiinfo = {
"uart16550A MIDI",
0,
0,
0,
};
/*
* These functions goes into uartsio_op_desc to get called
* from sound.c.
*/
static int uartsio_probe(device_t dev);
static int uartsio_attach(device_t dev);
static d_ioctl_t uartsio_ioctl;
static driver_intr_t uartsio_intr;
static midi_callback_t uartsio_callback;
/* Here is the parameter structure per a device. */
struct uartsio_softc {
device_t dev; /* device information */
mididev_info *devinfo; /* midi device information */
struct mtx mtx; /* Mutex to protect the device. */
struct resource *io; /* Base of io port */
int io_rid; /* Io resource ID */
struct resource *irq; /* Irq */
int irq_rid; /* Irq resource ID */
void *ih; /* Interrupt cookie */
int fflags; /* File flags */
int has_fifo; /* TX/RX fifo in the uart */
int tx_size; /* Size of TX on a transmission */
};
typedef struct uartsio_softc *sc_p;
/* These functions are local. */
static void uartsio_startplay(sc_p scp);
static int uartsio_xmit(sc_p scp);
static int uartsio_readport(sc_p scp, int off);
static void uartsio_writeport(sc_p scp, int off, u_int8_t value);
static int uartsio_allocres(sc_p scp, device_t dev);
static void uartsio_releaseres(sc_p scp, device_t dev);
/*
* This is the device descriptor for the midi device.
*/
static mididev_info uartsio_op_desc = {
"16550 uart midi",
SNDCARD_UART16550,
NULL,
NULL,
uartsio_ioctl,
uartsio_callback,
MIDI_BUFFSIZE, /* Queue Length */
0, /* XXX This is not an *audio* device! */
};
/*
* Here are the main functions to interact to the user process.
* These are called from snd* functions in sys/i386/isa/snd/sound.c.
*/
static int
uartsio_probe(device_t dev)
{
sc_p scp;
int unit;
u_char c;
if (isa_get_logicalid(dev) != 0)
/* This is NOT a PnP device! */
return (ENXIO);
scp = device_get_softc(dev);
unit = device_get_unit(dev);
device_set_desc(dev, uartsio_op_desc.name);
bzero(scp, sizeof(*scp));
scp->io_rid = 0;
scp->io = bus_alloc_resource(dev, SYS_RES_IOPORT, &scp->io_rid, 0, ~0, 8, RF_ACTIVE);
if (scp->io == NULL)
return (ENXIO);
MIDI_DEBUG(printf("uartsio%d: probing.\n", unit));
/* Read the IER. The upper four bits should all be zero. */
c = uartsio_readport(scp, com_ier);
if ((c & 0xf0) != 0) {
uartsio_releaseres(scp, dev);
return (ENXIO);
}
/* Read the MSR. The upper three bits should all be zero. */
c = uartsio_readport(scp, com_mcr);
if ((c & 0xe0) != 0) {
uartsio_releaseres(scp, dev);
return (ENXIO);
}
/* XXX Do we need a loopback test? */
MIDI_DEBUG(printf("uartsio%d: probed.\n", unit));
return (0);
}
static int
uartsio_attach(device_t dev)
{
sc_p scp;
mididev_info *devinfo;
scp = device_get_softc(dev);
MIDI_DEBUG(printf("uartsio: attaching.\n"));
/* Allocate resources. */
if (uartsio_allocres(scp, dev)) {
uartsio_releaseres(scp, dev);
return (ENXIO);
}
/* See the size of the tx fifo. */
uartsio_writeport(scp, com_fifo, FIFO_ENABLE | FIFO_RCV_RST | FIFO_XMT_RST | FIFO_RX_HIGH);
if ((uartsio_readport(scp, com_iir) & IIR_FIFO_MASK) == FIFO_RX_HIGH) {
scp->has_fifo = 1;
scp->tx_size = TX_FIFO_SIZE;
MIDI_DEBUG(printf("uartsio: uart is 16550A, tx size is %d bytes.\n", scp->tx_size));
} else {
scp->has_fifo = 0;
scp->tx_size = 1;
MIDI_DEBUG(printf("uartsio: uart is not 16550A.\n"));
}
/* Configure the uart. */
uartsio_writeport(scp, com_cfcr, CFCR_DLAB); /* Latch the divisor. */
uartsio_writeport(scp, com_dlbl, 0x03);
uartsio_writeport(scp, com_dlbh, 0x00); /* We want a bitrate of 38.4kbps. */
uartsio_writeport(scp, com_cfcr, CFCR_8BITS); /* We want 8bits, 1 stop bit, no parity. */
uartsio_writeport(scp, com_mcr, MCR_IENABLE | MCR_RTS | MCR_DTR); /* Enable interrupt, set RTS and DTR. */
uartsio_writeport(scp, com_ier, IER_ERXRDY | IER_ETXRDY | IER_EMSC | IER_ERLS); /* Give us an interrupt on RXRDY, TXRDY, MSC and RLS. */
if (scp->has_fifo)
uartsio_writeport(scp, com_fifo, FIFO_ENABLE | FIFO_RCV_RST | FIFO_XMT_RST | FIFO_RX_LOW); /* We use the fifo. */
else
uartsio_writeport(scp, com_fifo, FIFO_RCV_RST | FIFO_XMT_RST | FIFO_RX_LOW); /* We do not use the fifo. */
/* Clear the gabage. */
uartsio_readport(scp, com_lsr);
uartsio_readport(scp, com_lsr);
uartsio_readport(scp, com_iir);
uartsio_readport(scp, com_data);
/* Fill the softc. */
scp->dev = dev;
mtx_init(&scp->mtx, "siomid", MTX_DEF);
scp->devinfo = devinfo = create_mididev_info_unit(MDT_MIDI, &uartsio_op_desc, &midisynth_op_desc);
/* Fill the midi info. */
snprintf(devinfo->midistat, sizeof(devinfo->midistat), "at 0x%x irq %d",
(u_int)rman_get_start(scp->io), (int)rman_get_start(scp->irq));
midiinit(devinfo, dev);
/* Now we can handle the interrupts. */
bus_setup_intr(dev, scp->irq, INTR_TYPE_AV, uartsio_intr, scp, &scp->ih);
MIDI_DEBUG(printf("uartsio: attached.\n"));
return (0);
}
static int
uartsio_ioctl(dev_t i_dev, u_long cmd, caddr_t arg, int mode, struct thread *td)
{
sc_p scp;
mididev_info *devinfo;
int unit;
struct synth_info *synthinfo;
struct midi_info *midiinfo;
unit = MIDIUNIT(i_dev);
MIDI_DEBUG(printf("uartsio_ioctl: unit %d, cmd %s.\n", unit, midi_cmdname(cmd, cmdtab_midiioctl)));
devinfo = get_mididev_info(i_dev, &unit);
if (devinfo == NULL) {
MIDI_DEBUG(printf("uartsio_ioctl: unit %d is not configured.\n", unit));
return (ENXIO);
}
scp = devinfo->softc;
switch (cmd) {
case SNDCTL_SYNTH_INFO:
synthinfo = (struct synth_info *)arg;
if (synthinfo->device != unit)
return (ENXIO);
bcopy(&uartsio_synthinfo, synthinfo, sizeof(uartsio_synthinfo));
synthinfo->device = unit;
return (0);
break;
case SNDCTL_MIDI_INFO:
midiinfo = (struct midi_info *)arg;
if (midiinfo->device != unit)
return (ENXIO);
bcopy(&uartsio_midiinfo, midiinfo, sizeof(uartsio_midiinfo));
midiinfo->device = unit;
return (0);
break;
default:
return (ENOSYS);
}
/* NOTREACHED */
return (EINVAL);
}
static void
uartsio_intr(void *arg)
{
sc_p scp;
mididev_info *devinfo;
scp = (sc_p)arg;
devinfo = scp->devinfo;
mtx_lock(&devinfo->flagqueue_mtx);
uartsio_xmit(scp);
mtx_unlock(&devinfo->flagqueue_mtx);
/* Invoke the upper layer. */
midi_intr(devinfo);
}
static int
uartsio_callback(void *di, int reason)
{
int unit;
sc_p scp;
mididev_info *d;
d = (mididev_info *)di;
mtx_assert(&d->flagqueue_mtx, MA_OWNED);
if (d == NULL) {
MIDI_DEBUG(printf("uartsio_callback: device not configured.\n"));
return (ENXIO);
}
unit = d->unit;
scp = d->softc;
switch (reason & MIDI_CB_REASON_MASK) {
case MIDI_CB_START:
if ((reason & MIDI_CB_RD) != 0 && (d->flags & MIDI_F_READING) == 0)
/* Begin recording. */
d->flags |= MIDI_F_READING;
if ((reason & MIDI_CB_WR) != 0 && (d->flags & MIDI_F_WRITING) == 0)
uartsio_startplay(scp);
break;
case MIDI_CB_STOP:
case MIDI_CB_ABORT:
if ((reason & MIDI_CB_RD) != 0 && (d->flags & MIDI_F_READING) != 0)
/* Stop recording. */
d->flags &= ~MIDI_F_READING;
if ((reason & MIDI_CB_WR) != 0 && (d->flags & MIDI_F_WRITING) != 0)
/* Stop Playing. */
d->flags &= ~MIDI_F_WRITING;
break;
}
return (0);
}
/*
* The functions below here are the libraries for the above ones.
*/
/*
* Starts to play the data in the output queue.
*/
static void
uartsio_startplay(sc_p scp)
{
mididev_info *devinfo;
devinfo = scp->devinfo;
mtx_assert(&devinfo->flagqueue_mtx, MA_OWNED);
/* Can we play now? */
if (devinfo->midi_dbuf_out.rl == 0)
return;
devinfo->flags |= MIDI_F_WRITING;
uartsio_xmit(scp);
}
static int
uartsio_xmit(sc_p scp)
{
mididev_info *devinfo;
midi_dbuf *dbuf;
int lsr, msr, iir, i, txsize, leni, leno;
u_char c[TX_FIFO_SIZE];
devinfo = scp->devinfo;
mtx_assert(&devinfo->flagqueue_mtx, MA_OWNED);
mtx_lock(&scp->mtx);
for (;;) {
/* Read the received data. */
while (((lsr = uartsio_readport(scp, com_lsr)) & LSR_RCV_MASK) != 0) {
/* Is this a data or an error/break? */
if ((lsr & LSR_RXRDY) == 0)
printf("uartsio_xmit: receive error or break in unit %d.\n", devinfo->unit);
else {
/* Receive the data. */
c[0] = uartsio_readport(scp, com_data);
mtx_unlock(&scp->mtx);
/* Queue into the passthru buffer and start transmitting if we can. */
if ((devinfo->flags & MIDI_F_PASSTHRU) != 0 && ((devinfo->flags & MIDI_F_BUSY) == 0 || (devinfo->fflags & FWRITE) == 0)) {
midibuf_input_intr(&devinfo->midi_dbuf_passthru, &c[0], sizeof(c[0]), &leni);
devinfo->flags |= MIDI_F_WRITING;
}
/* Queue if we are reading. Discard an active sensing. */
if ((devinfo->flags & MIDI_F_READING) != 0 && c[0] != 0xfe)
midibuf_input_intr(&devinfo->midi_dbuf_in, &c[0], sizeof(c[0]), &leni);
mtx_lock(&scp->mtx);
}
}
mtx_unlock(&scp->mtx);
/* See which source to use. */
if ((devinfo->flags & MIDI_F_PASSTHRU) == 0 || ((devinfo->flags & MIDI_F_BUSY) != 0 && (devinfo->fflags & FWRITE) != 0))
dbuf = &devinfo->midi_dbuf_out;
else
dbuf = &devinfo->midi_dbuf_passthru;
/* Transmit the data in the queue. */
if ((devinfo->flags & MIDI_F_WRITING) != 0) {
/* Do we have the data to transmit? */
if (dbuf->rl == 0) {
/* Stop playing. */
devinfo->flags &= ~MIDI_F_WRITING;
} else {
mtx_lock(&scp->mtx);
/* Read LSR and MSR. */
lsr = uartsio_readport(scp, com_lsr);
msr = uartsio_readport(scp, com_msr);
/* Is the device ready?. */
if ((lsr & LSR_TXRDY) != 0 && (msr & MSR_CTS) != 0) {
/* send the data. */
txsize = scp->tx_size;
if (dbuf->rl < txsize)
txsize = dbuf->rl;
midibuf_output_intr(dbuf, c, txsize, &leno);
for (i = 0 ; i < txsize ; i++)
uartsio_writeport(scp, com_data, c[i]);
/* We are playing now. */
devinfo->flags |= MIDI_F_WRITING;
} else {
/* Do we have the data to transmit? */
if (dbuf->rl > 0)
/* Wait for the next interrupt. */
devinfo->flags |= MIDI_F_WRITING;
}
mtx_unlock(&scp->mtx);
}
}
mtx_lock(&scp->mtx);
if (((iir = uartsio_readport(scp, com_iir)) & IIR_IMASK) == IIR_NOPEND)
break;
}
mtx_unlock(&scp->mtx);
return (0);
}
/* Reads from a port. */
static int
uartsio_readport(sc_p scp, int off)
{
return bus_space_read_1(rman_get_bustag(scp->io), rman_get_bushandle(scp->io), off);
}
/* Writes to a port. */
static void
uartsio_writeport(sc_p scp, int off, u_int8_t value)
{
return bus_space_write_1(rman_get_bustag(scp->io), rman_get_bushandle(scp->io), off, value);
}
/* Allocates resources other than IO ports. */
static int
uartsio_allocres(sc_p scp, device_t dev)
{
if (scp->irq == NULL) {
scp->irq_rid = 0;
scp->irq = bus_alloc_resource(dev, SYS_RES_IRQ, &scp->irq_rid, 0, ~0, 1, RF_ACTIVE);
}
if (scp->irq == NULL)
return (1);
return (0);
}
/* Releases resources. */
static void
uartsio_releaseres(sc_p scp, device_t dev)
{
if (scp->irq != NULL) {
bus_release_resource(dev, SYS_RES_IRQ, scp->irq_rid, scp->irq);
scp->irq = NULL;
}
if (scp->io != NULL) {
bus_release_resource(dev, SYS_RES_IOPORT, scp->io_rid, scp->io);
scp->io = NULL;
}
}
static device_method_t uartsio_methods[] = {
/* Device interface */
DEVMETHOD(device_probe , uartsio_probe ),
DEVMETHOD(device_attach, uartsio_attach),
{ 0, 0 },
};
static driver_t uartsio_driver = {
"midi",
uartsio_methods,
sizeof(struct uartsio_softc),
};
DRIVER_MODULE(uartsio, isa, uartsio_driver, midi_devclass, 0, 0);
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