adlink.c

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    1 /*-
    2  * Copyright (c) 2003-2004 Poul-Henning Kamp
    3  * All rights reserved.
    4  *
    5  * Redistribution and use in source and binary forms, with or without
    6  * modification, are permitted provided that the following conditions
    7  * are met:
    8  * 1. Redistributions of source code must retain the above copyright
    9  *    notice, this list of conditions and the following disclaimer.
   10  * 2. Redistributions in binary form must reproduce the above copyright
   11  *    notice, this list of conditions and the following disclaimer in the
   12  *    documentation and/or other materials provided with the distribution.
   13  * 3. The names of the authors may not be used to endorse or promote
   14  *    products derived from this software without specific prior written
   15  *    permission.
   16  *
   17  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
   18  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   19  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   20  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
   21  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
   22  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
   23  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
   24  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
   25  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
   26  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   27  * SUCH DAMAGE.
   28  *
   29  * This is a device driver or the Adlink 9812 and 9810 ADC cards, mainly
   30  * intended to support Software Defined Radio reception of timesignals
   31  * in the VLF band.  See http://phk.freebsd.dk/loran-c
   32  *
   33  * The driver is configured with ioctls which define a ringbuffer with
   34  * a given number of chunks in it.  The a control structure and the
   35  * ringbuffer can then be mmap(2)'ed into userland and the application
   36  * can operate on the data directly.
   37  *
   38  * Tested with 10MHz external clock, divisor of 2 (ie: 5MHz sampling),
   39  * One channel active (ie: 2 bytes per sample = 10MB/sec) on a 660MHz
   40  * Celeron PC.
   41  *
   42  */
   43 
   44 #ifdef _KERNEL
   45 #include <sys/cdefs.h>
   46 __FBSDID("$FreeBSD$");
   47 
   48 #include <sys/param.h>
   49 #include <sys/systm.h>
   50 #include <sys/malloc.h>
   51 #include <sys/kernel.h>
   52 #include <sys/module.h>
   53 #include <sys/kthread.h>
   54 #include <sys/conf.h>
   55 #include <sys/bus.h>
   56 #include <machine/bus.h>
   57 #include <machine/resource.h>
   58 #include <sys/rman.h>
   59 #include <dev/pci/pcireg.h>
   60 #include <dev/pci/pcivar.h>
   61 #include <pci_if.h>
   62 #include <vm/vm.h>
   63 #include <vm/pmap.h>
   64 
   65 #endif /* _KERNEL */
   66 
   67 #include <sys/ioccom.h>
   68 
   69 #define ADLINK_SETDIVISOR       _IOWR('A', 255, u_int)  /* divisor */
   70 #define ADLINK_SETCHUNKSIZE     _IOWR('A', 254, u_int)  /* bytes */
   71 #define ADLINK_SETRINGSIZE      _IOWR('A', 253, u_int)  /* bytes */
   72 #define ADLINK_START            _IOWR('A', 252, u_int)  /* dummy */
   73 #define ADLINK_STOP             _IOWR('A', 251, u_int)  /* dummy */
   74 #define ADLINK_RESET            _IOWR('A', 250, u_int)  /* dummy */
   75 
   76 struct page0 {
   77         u_int                   version;
   78         int                     state;
   79 #         define STATE_RESET    -1
   80 #         define STATE_RUN      0
   81         u_int                   divisor;        /* int */
   82         u_int                   chunksize;      /* bytes */
   83         u_int                   ringsize;       /* chunks */
   84         u_int                   o_sample;       /*
   85                                                  * offset of ring generation
   86                                                  * array
   87                                                  */
   88         u_int                   o_ring;         /* offset of ring */
   89 };
   90 
   91 #define PAGE0VERSION    20050219
   92 
   93 #ifdef _KERNEL
   94 
   95 struct pgstat {
   96         uint64_t                *sample;
   97         vm_paddr_t              phys;
   98         void                    *virt;
   99         struct pgstat           *next;
  100 };
  101 
  102 struct softc {
  103         device_t                device;
  104         void                    *intrhand;
  105         struct resource         *res[3];
  106         struct cdev             *dev;
  107         off_t                   mapvir;
  108         int                     error;
  109         struct page0            *p0;
  110         u_int                   nchunks;
  111         struct pgstat           *chunks;
  112         struct pgstat           *next;
  113         uint64_t                sample;
  114 };
  115 
  116 static d_ioctl_t adlink_ioctl;
  117 static d_mmap_t adlink_mmap;
  118 static int adlink_intr(void *arg);
  119 
  120 static struct cdevsw adlink_cdevsw = {
  121         .d_version =    D_VERSION,
  122         .d_flags =      D_NEEDGIANT,
  123         .d_ioctl =      adlink_ioctl,
  124         .d_mmap =       adlink_mmap,
  125         .d_name =       "adlink",
  126 };
  127 
  128 static int
  129 adlink_intr(void *arg)
  130 {
  131         struct softc *sc;
  132         struct pgstat *pg;
  133         uint32_t u;
  134 
  135         sc = arg;
  136         u = bus_read_4(sc->res[0], 0x38);
  137         if (!(u & 0x00800000))
  138                 return; // XXX - FILTER_STRAY?
  139         bus_write_4(sc->res[0], 0x38, u | 0x003f4000);
  140 
  141         sc->sample += sc->p0->chunksize / 2;
  142         pg = sc->next;
  143         *(pg->sample) = sc->sample;
  144 
  145         u = bus_read_4(sc->res[1], 0x18);
  146         if (u & 1)
  147                 sc->p0->state = EIO;
  148 
  149         if (sc->p0->state != STATE_RUN) {
  150                 printf("adlink: stopping %d\n", sc->p0->state);
  151                 return; // XXX - FILTER_STRAY?
  152         }
  153 
  154         pg = pg->next;
  155         sc->next = pg;
  156         *(pg->sample) = 0;
  157         bus_write_4(sc->res[0], 0x24, pg->phys);
  158         bus_write_4(sc->res[0], 0x28, sc->p0->chunksize);
  159         wakeup(sc);
  160         return (FILTER_HANDLED);
  161 }
  162 
  163 static int
  164 adlink_mmap(struct cdev *dev, vm_ooffset_t offset, vm_paddr_t *paddr,
  165     int nprot, vm_memattr_t *memattr)
  166 {
  167         struct softc *sc;
  168         vm_offset_t o;
  169         int i;
  170         struct pgstat *pg;
  171 
  172         sc = dev->si_drv1;
  173         if (nprot != VM_PROT_READ)
  174                 return (-1);
  175         if (offset == 0) {
  176                 *paddr = vtophys(sc->p0);
  177                 return (0);
  178         }
  179         o = PAGE_SIZE;
  180         pg = sc->chunks;
  181         for (i = 0; i < sc->nchunks; i++, pg++) {
  182                 if (offset - o >= sc->p0->chunksize) {
  183                         o += sc->p0->chunksize;
  184                         continue;
  185                 }
  186                 *paddr = pg->phys + (offset - o);
  187                 return (0);
  188         }
  189         return (-1);
  190 }
  191 
  192 static int
  193 adlink_ioctl(struct cdev *dev, u_long cmd, caddr_t data, int fflag, struct thread *td)
  194 {
  195         struct softc *sc;
  196         int i, error;
  197         u_int u;
  198         struct pgstat *pg;
  199         uint64_t *sample;
  200         
  201         sc = dev->si_drv1;
  202         u = *(u_int*)data;
  203         error = 0;
  204         switch (cmd) {
  205         case ADLINK_SETDIVISOR:
  206                 if (sc->p0->state == STATE_RUN)
  207                         return (EBUSY);
  208                 if (u & 1)
  209                         return (EINVAL);
  210                 sc->p0->divisor = u;
  211                 break;
  212         case ADLINK_SETCHUNKSIZE:
  213                 if (sc->p0->state != STATE_RESET)
  214                         return (EBUSY);
  215                 if (u % PAGE_SIZE)
  216                         return (EINVAL);
  217                 if (sc->p0->ringsize != 0 && sc->p0->ringsize % u)
  218                         return (EINVAL);
  219                 sc->p0->chunksize = u;
  220                 break;
  221         case ADLINK_SETRINGSIZE:
  222                 if (sc->p0->state != STATE_RESET)
  223                         return (EBUSY);
  224                 if (u % PAGE_SIZE)
  225                         return (EINVAL);
  226                 if (sc->p0->chunksize != 0 && u % sc->p0->chunksize)
  227                         return (EINVAL);
  228                 sc->p0->ringsize = u;
  229                 break;
  230         case ADLINK_START:
  231                 if (sc->p0->state == STATE_RUN)
  232                         return (EBUSY);
  233                 if (sc->p0->state == STATE_RESET) {
  234                         
  235                         if (sc->p0->chunksize == 0)
  236                                 sc->p0->chunksize = 4 * PAGE_SIZE;
  237                         if (sc->p0->ringsize == 0)
  238                                 sc->p0->ringsize = 16 * sc->p0->chunksize;
  239                         if (sc->p0->divisor == 0)
  240                                 sc->p0->divisor = 4;
  241 
  242                         sc->nchunks = sc->p0->ringsize / sc->p0->chunksize;
  243                         if (sc->nchunks * sizeof (*pg->sample) +
  244                             sizeof *sc->p0 > PAGE_SIZE)
  245                                 return (EINVAL);
  246                         sc->p0->o_ring = PAGE_SIZE;
  247                         sample = (uint64_t *)(sc->p0 + 1);
  248                         sc->p0->o_sample =
  249                             (uintptr_t)sample - (uintptr_t)(sc->p0);
  250                         pg = malloc(sizeof *pg * sc->nchunks,
  251                             M_DEVBUF, M_WAITOK | M_ZERO);
  252                         sc->chunks = pg;
  253                         for (i = 0; i < sc->nchunks; i++) {
  254                                 pg->sample = sample;
  255                                 *pg->sample = 0;
  256                                 sample++;
  257                                 pg->virt = contigmalloc(sc->p0->chunksize,
  258                                     M_DEVBUF, M_WAITOK,
  259                                     0ul, 0xfffffffful,
  260                                     PAGE_SIZE, 0);
  261                                 pg->phys = vtophys(pg->virt);
  262                                 if (i == sc->nchunks - 1)
  263                                         pg->next = sc->chunks;
  264                                 else
  265                                         pg->next = pg + 1;
  266                                 pg++;
  267                         }
  268                         sc->next = sc->chunks;
  269                 }
  270 
  271                 /* Reset generation numbers */
  272                 pg = sc->chunks;
  273                 for (i = 0; i < sc->nchunks; i++) {
  274                         *pg->sample = 0;
  275                         pg++;
  276                 }
  277 
  278                 /* Enable interrupts on write complete */
  279                 bus_write_4(sc->res[0], 0x38, 0x00004000);
  280 
  281                 /* Sample CH0 only */
  282                 bus_write_4(sc->res[1], 0x00, 1);
  283 
  284                 /* Divide clock by four */
  285                 bus_write_4(sc->res[1], 0x04, sc->p0->divisor);
  286 
  287                 /* Software trigger mode: software */
  288                 bus_write_4(sc->res[1], 0x08, 0);
  289 
  290                 /* Trigger level zero */
  291                 bus_write_4(sc->res[1], 0x0c, 0);
  292 
  293                 /* Trigger source CH0 (not used) */
  294                 bus_write_4(sc->res[1], 0x10, 0);
  295 
  296                 /* Fifo control/status: flush */
  297                 bus_write_4(sc->res[1], 0x18, 3);
  298 
  299                 /* Clock source: external sine */
  300                 bus_write_4(sc->res[1], 0x20, 2);
  301 
  302                 /* Chipmunks are go! */
  303                 sc->p0->state = STATE_RUN;
  304 
  305                 /* Set up Write DMA */
  306                 pg = sc->next = sc->chunks;
  307                 *(pg->sample) = 0;
  308                 bus_write_4(sc->res[0], 0x24, pg->phys);
  309                 bus_write_4(sc->res[0], 0x28, sc->p0->chunksize);
  310                 u = bus_read_4(sc->res[0], 0x3c);
  311                 bus_write_4(sc->res[0], 0x3c, u | 0x00000600);
  312 
  313                 /* Acquisition Enable Register: go! */
  314                 bus_write_4(sc->res[1], 0x1c, 1);
  315 
  316                 break;
  317         case ADLINK_STOP:
  318                 if (sc->p0->state == STATE_RESET)
  319                         break;
  320                 sc->p0->state = EINTR;  
  321                 while (*(sc->next->sample) == 0)
  322                         tsleep(sc, PUSER | PCATCH, "adstop", 1);
  323                 break;
  324 #ifdef notyet
  325         /*
  326          * I'm not sure we can actually do this.  How do we revoke
  327          * the mmap'ed pages from any process having them mmapped ?
  328          */
  329         case ADLINK_RESET:
  330                 if (sc->p0->state == STATE_RESET)
  331                         break;
  332                 sc->p0->state = EINTR;  
  333                 while (*(sc->next->samp) == 0)
  334                         tsleep(sc, PUSER | PCATCH, "adreset", 1);
  335                 /* deallocate ring buffer */
  336                 break;
  337 #endif
  338         default:
  339                 error = ENOIOCTL;
  340                 break;
  341         }
  342         return (error);
  343 }
  344 
  345 static devclass_t adlink_devclass;
  346 
  347 static int
  348 adlink_probe(device_t self)
  349 {
  350 
  351         if (pci_get_devid(self) != 0x80da10e8)
  352                 return (ENXIO);
  353         device_set_desc(self, "Adlink PCI-9812 4 ch 12 bit 20 msps");
  354         return (BUS_PROBE_DEFAULT);
  355 }
  356 
  357 static struct resource_spec adlink_res_spec[] = {
  358         { SYS_RES_IOPORT,       PCIR_BAR(0),    RF_ACTIVE},
  359         { SYS_RES_IOPORT,       PCIR_BAR(1),    RF_ACTIVE},
  360         { SYS_RES_IRQ,          0,              RF_ACTIVE | RF_SHAREABLE},
  361         { -1, 0, 0 }
  362 };
  363 
  364 static int
  365 adlink_attach(device_t self)
  366 {
  367         struct softc *sc;
  368         int i, error;
  369 
  370         sc = device_get_softc(self);
  371         bzero(sc, sizeof *sc);
  372         sc->device = self;
  373 
  374         error = bus_alloc_resources(self, adlink_res_spec, sc->res);
  375         if (error)
  376                 return (error);
  377 
  378         i = bus_setup_intr(self, sc->res[2], INTR_TYPE_MISC,
  379             adlink_intr, NULL, sc, &sc->intrhand);
  380         if (i) {
  381                 printf("adlink: Couldn't get FAST intr\n");
  382                 i = bus_setup_intr(self, sc->res[2],
  383                     INTR_MPSAFE | INTR_TYPE_MISC,
  384                     NULL, (driver_intr_t *)adlink_intr, sc, &sc->intrhand);
  385         }
  386 
  387         if (i) {
  388                 bus_release_resources(self, adlink_res_spec, sc->res);
  389                 return (ENODEV);
  390         }
  391 
  392         sc->p0 = malloc(PAGE_SIZE, M_DEVBUF, M_WAITOK | M_ZERO);
  393         sc->p0->version = PAGE0VERSION;
  394         sc->p0->state = STATE_RESET;
  395 
  396         sc->dev = make_dev(&adlink_cdevsw, device_get_unit(self),
  397             UID_ROOT, GID_WHEEL, 0444, "adlink%d", device_get_unit(self));
  398         sc->dev->si_drv1 = sc;
  399 
  400         return (0);
  401 }
  402 
  403 static device_method_t adlink_methods[] = {
  404         /* Device interface */
  405         DEVMETHOD(device_probe,         adlink_probe),
  406         DEVMETHOD(device_attach,        adlink_attach),
  407         DEVMETHOD(device_suspend,       bus_generic_suspend),
  408         DEVMETHOD(device_resume,        bus_generic_resume),
  409         DEVMETHOD(device_shutdown,      bus_generic_shutdown),
  410         {0, 0}
  411 };
  412  
  413 static driver_t adlink_driver = {
  414         "adlink",
  415         adlink_methods,
  416         sizeof(struct softc)
  417 };
  418 
  419 DRIVER_MODULE(adlink, pci, adlink_driver, adlink_devclass, 0, 0);
  420 
  421 #endif /* _KERNEL */
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FreeBSD/Linux Kernel Cross Reference sys/dev/adlink/adlink.c

FreeBSD/Linux Kernel Cross Reference
sys/dev/adlink/adlink.c
