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/*-
* Copyright (c) 2003-2004 Poul-Henning Kamp
* All rights reserved.
*
* 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.
* 3. The names of the authors may not be used to endorse or promote
* products derived from this software without specific prior written
* permission.
*
* 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.
*
* This is a device driver or the Adlink 9812 and 9810 ADC cards, mainly
* intended to support Software Defined Radio reception of timesignals
* in the VLF band. See http://phk.freebsd.dk/loran-c
*
* The driver is configured with ioctls which define a ringbuffer with
* a given number of chunks in it. The a control structure and the
* ringbuffer can then be mmap(2)'ed into userland and the application
* can operate on the data directly.
*
* Tested with 10MHz external clock, divisor of 2 (ie: 5MHz sampling),
* One channel active (ie: 2 bytes per sample = 10MB/sec) on a 660MHz
* Celeron PC.
*
*/
#ifdef _KERNEL
#include <sys/cdefs.h>
__FBSDID("$FreeBSD: release/9.1.0/sys/dev/adlink/adlink.c 217068 2011-01-06 21:02:14Z jhb $");
#include <sys/param.h>
#include <sys/systm.h>
#include <sys/malloc.h>
#include <sys/kernel.h>
#include <sys/module.h>
#include <sys/kthread.h>
#include <sys/conf.h>
#include <sys/bus.h>
#include <machine/bus.h>
#include <machine/resource.h>
#include <sys/rman.h>
#include <dev/pci/pcireg.h>
#include <dev/pci/pcivar.h>
#include <pci_if.h>
#include <vm/vm.h>
#include <vm/pmap.h>
#endif /* _KERNEL */
#include <sys/ioccom.h>
#define ADLINK_SETDIVISOR _IOWR('A', 255, u_int) /* divisor */
#define ADLINK_SETCHUNKSIZE _IOWR('A', 254, u_int) /* bytes */
#define ADLINK_SETRINGSIZE _IOWR('A', 253, u_int) /* bytes */
#define ADLINK_START _IOWR('A', 252, u_int) /* dummy */
#define ADLINK_STOP _IOWR('A', 251, u_int) /* dummy */
#define ADLINK_RESET _IOWR('A', 250, u_int) /* dummy */
struct page0 {
u_int version;
int state;
# define STATE_RESET -1
# define STATE_RUN 0
u_int divisor; /* int */
u_int chunksize; /* bytes */
u_int ringsize; /* chunks */
u_int o_sample; /*
* offset of ring generation
* array
*/
u_int o_ring; /* offset of ring */
};
#define PAGE0VERSION 20050219
#ifdef _KERNEL
struct pgstat {
uint64_t *sample;
vm_paddr_t phys;
void *virt;
struct pgstat *next;
};
struct softc {
device_t device;
void *intrhand;
struct resource *res[3];
struct cdev *dev;
off_t mapvir;
int error;
struct page0 *p0;
u_int nchunks;
struct pgstat *chunks;
struct pgstat *next;
uint64_t sample;
};
static d_ioctl_t adlink_ioctl;
static d_mmap_t adlink_mmap;
static int adlink_intr(void *arg);
static struct cdevsw adlink_cdevsw = {
.d_version = D_VERSION,
.d_flags = D_NEEDGIANT,
.d_ioctl = adlink_ioctl,
.d_mmap = adlink_mmap,
.d_name = "adlink",
};
static int
adlink_intr(void *arg)
{
struct softc *sc;
struct pgstat *pg;
uint32_t u;
sc = arg;
u = bus_read_4(sc->res[0], 0x38);
if (!(u & 0x00800000))
return; // XXX - FILTER_STRAY?
bus_write_4(sc->res[0], 0x38, u | 0x003f4000);
sc->sample += sc->p0->chunksize / 2;
pg = sc->next;
*(pg->sample) = sc->sample;
u = bus_read_4(sc->res[1], 0x18);
if (u & 1)
sc->p0->state = EIO;
if (sc->p0->state != STATE_RUN) {
printf("adlink: stopping %d\n", sc->p0->state);
return; // XXX - FILTER_STRAY?
}
pg = pg->next;
sc->next = pg;
*(pg->sample) = 0;
bus_write_4(sc->res[0], 0x24, pg->phys);
bus_write_4(sc->res[0], 0x28, sc->p0->chunksize);
wakeup(sc);
return (FILTER_HANDLED);
}
static int
adlink_mmap(struct cdev *dev, vm_ooffset_t offset, vm_paddr_t *paddr,
int nprot, vm_memattr_t *memattr)
{
struct softc *sc;
vm_offset_t o;
int i;
struct pgstat *pg;
sc = dev->si_drv1;
if (nprot != VM_PROT_READ)
return (-1);
if (offset == 0) {
*paddr = vtophys(sc->p0);
return (0);
}
o = PAGE_SIZE;
pg = sc->chunks;
for (i = 0; i < sc->nchunks; i++, pg++) {
if (offset - o >= sc->p0->chunksize) {
o += sc->p0->chunksize;
continue;
}
*paddr = pg->phys + (offset - o);
return (0);
}
return (-1);
}
static int
adlink_ioctl(struct cdev *dev, u_long cmd, caddr_t data, int fflag, struct thread *td)
{
struct softc *sc;
int i, error;
u_int u;
struct pgstat *pg;
uint64_t *sample;
sc = dev->si_drv1;
u = *(u_int*)data;
error = 0;
switch (cmd) {
case ADLINK_SETDIVISOR:
if (sc->p0->state == STATE_RUN)
return (EBUSY);
if (u & 1)
return (EINVAL);
sc->p0->divisor = u;
break;
case ADLINK_SETCHUNKSIZE:
if (sc->p0->state != STATE_RESET)
return (EBUSY);
if (u % PAGE_SIZE)
return (EINVAL);
if (sc->p0->ringsize != 0 && sc->p0->ringsize % u)
return (EINVAL);
sc->p0->chunksize = u;
break;
case ADLINK_SETRINGSIZE:
if (sc->p0->state != STATE_RESET)
return (EBUSY);
if (u % PAGE_SIZE)
return (EINVAL);
if (sc->p0->chunksize != 0 && u % sc->p0->chunksize)
return (EINVAL);
sc->p0->ringsize = u;
break;
case ADLINK_START:
if (sc->p0->state == STATE_RUN)
return (EBUSY);
if (sc->p0->state == STATE_RESET) {
if (sc->p0->chunksize == 0)
sc->p0->chunksize = 4 * PAGE_SIZE;
if (sc->p0->ringsize == 0)
sc->p0->ringsize = 16 * sc->p0->chunksize;
if (sc->p0->divisor == 0)
sc->p0->divisor = 4;
sc->nchunks = sc->p0->ringsize / sc->p0->chunksize;
if (sc->nchunks * sizeof (*pg->sample) +
sizeof *sc->p0 > PAGE_SIZE)
return (EINVAL);
sc->p0->o_ring = PAGE_SIZE;
sample = (uint64_t *)(sc->p0 + 1);
sc->p0->o_sample =
(uintptr_t)sample - (uintptr_t)(sc->p0);
pg = malloc(sizeof *pg * sc->nchunks,
M_DEVBUF, M_WAITOK | M_ZERO);
sc->chunks = pg;
for (i = 0; i < sc->nchunks; i++) {
pg->sample = sample;
*pg->sample = 0;
sample++;
pg->virt = contigmalloc(sc->p0->chunksize,
M_DEVBUF, M_WAITOK,
0ul, 0xfffffffful,
PAGE_SIZE, 0);
pg->phys = vtophys(pg->virt);
if (i == sc->nchunks - 1)
pg->next = sc->chunks;
else
pg->next = pg + 1;
pg++;
}
sc->next = sc->chunks;
}
/* Reset generation numbers */
pg = sc->chunks;
for (i = 0; i < sc->nchunks; i++) {
*pg->sample = 0;
pg++;
}
/* Enable interrupts on write complete */
bus_write_4(sc->res[0], 0x38, 0x00004000);
/* Sample CH0 only */
bus_write_4(sc->res[1], 0x00, 1);
/* Divide clock by four */
bus_write_4(sc->res[1], 0x04, sc->p0->divisor);
/* Software trigger mode: software */
bus_write_4(sc->res[1], 0x08, 0);
/* Trigger level zero */
bus_write_4(sc->res[1], 0x0c, 0);
/* Trigger source CH0 (not used) */
bus_write_4(sc->res[1], 0x10, 0);
/* Fifo control/status: flush */
bus_write_4(sc->res[1], 0x18, 3);
/* Clock source: external sine */
bus_write_4(sc->res[1], 0x20, 2);
/* Chipmunks are go! */
sc->p0->state = STATE_RUN;
/* Set up Write DMA */
pg = sc->next = sc->chunks;
*(pg->sample) = 0;
bus_write_4(sc->res[0], 0x24, pg->phys);
bus_write_4(sc->res[0], 0x28, sc->p0->chunksize);
u = bus_read_4(sc->res[0], 0x3c);
bus_write_4(sc->res[0], 0x3c, u | 0x00000600);
/* Acquisition Enable Register: go! */
bus_write_4(sc->res[1], 0x1c, 1);
break;
case ADLINK_STOP:
if (sc->p0->state == STATE_RESET)
break;
sc->p0->state = EINTR;
while (*(sc->next->sample) == 0)
tsleep(sc, PUSER | PCATCH, "adstop", 1);
break;
#ifdef notyet
/*
* I'm not sure we can actually do this. How do we revoke
* the mmap'ed pages from any process having them mmapped ?
*/
case ADLINK_RESET:
if (sc->p0->state == STATE_RESET)
break;
sc->p0->state = EINTR;
while (*(sc->next->samp) == 0)
tsleep(sc, PUSER | PCATCH, "adreset", 1);
/* deallocate ring buffer */
break;
#endif
default:
error = ENOIOCTL;
break;
}
return (error);
}
static devclass_t adlink_devclass;
static int
adlink_probe(device_t self)
{
if (pci_get_devid(self) != 0x80da10e8)
return (ENXIO);
device_set_desc(self, "Adlink PCI-9812 4 ch 12 bit 20 msps");
return (BUS_PROBE_DEFAULT);
}
static struct resource_spec adlink_res_spec[] = {
{ SYS_RES_IOPORT, PCIR_BAR(0), RF_ACTIVE},
{ SYS_RES_IOPORT, PCIR_BAR(1), RF_ACTIVE},
{ SYS_RES_IRQ, 0, RF_ACTIVE | RF_SHAREABLE},
{ -1, 0, 0 }
};
static int
adlink_attach(device_t self)
{
struct softc *sc;
int i, error;
sc = device_get_softc(self);
bzero(sc, sizeof *sc);
sc->device = self;
error = bus_alloc_resources(self, adlink_res_spec, sc->res);
if (error)
return (error);
i = bus_setup_intr(self, sc->res[2], INTR_TYPE_MISC,
adlink_intr, NULL, sc, &sc->intrhand);
if (i) {
printf("adlink: Couldn't get FAST intr\n");
i = bus_setup_intr(self, sc->res[2],
INTR_MPSAFE | INTR_TYPE_MISC,
NULL, (driver_intr_t *)adlink_intr, sc, &sc->intrhand);
}
if (i) {
bus_release_resources(self, adlink_res_spec, sc->res);
return (ENODEV);
}
sc->p0 = malloc(PAGE_SIZE, M_DEVBUF, M_WAITOK | M_ZERO);
sc->p0->version = PAGE0VERSION;
sc->p0->state = STATE_RESET;
sc->dev = make_dev(&adlink_cdevsw, device_get_unit(self),
UID_ROOT, GID_WHEEL, 0444, "adlink%d", device_get_unit(self));
sc->dev->si_drv1 = sc;
return (0);
}
static device_method_t adlink_methods[] = {
/* Device interface */
DEVMETHOD(device_probe, adlink_probe),
DEVMETHOD(device_attach, adlink_attach),
DEVMETHOD(device_suspend, bus_generic_suspend),
DEVMETHOD(device_resume, bus_generic_resume),
DEVMETHOD(device_shutdown, bus_generic_shutdown),
{0, 0}
};
static driver_t adlink_driver = {
"adlink",
adlink_methods,
sizeof(struct softc)
};
DRIVER_MODULE(adlink, pci, adlink_driver, adlink_devclass, 0, 0);
#endif /* _KERNEL */