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_offset_t offset, vm_paddr_t *paddr, int nprot)
  165 {
  166         struct softc *sc;
  167         vm_offset_t o;
  168         int i;
  169         struct pgstat *pg;
  170 
  171         sc = dev->si_drv1;
  172         if (nprot != VM_PROT_READ)
  173                 return (-1);
  174         if (offset == 0) {
  175                 *paddr = vtophys(sc->p0);
  176                 return (0);
  177         }
  178         o = PAGE_SIZE;
  179         pg = sc->chunks;
  180         for (i = 0; i < sc->nchunks; i++, pg++) {
  181                 if (offset - o >= sc->p0->chunksize) {
  182                         o += sc->p0->chunksize;
  183                         continue;
  184                 }
  185                 *paddr = pg->phys + (offset - o);
  186                 return (0);
  187         }
  188         return (-1);
  189 }
  190 
  191 static int
  192 adlink_ioctl(struct cdev *dev, u_long cmd, caddr_t data, int fflag, struct thread *td)
  193 {
  194         struct softc *sc;
  195         int i, error;
  196         u_int u;
  197         struct pgstat *pg;
  198         uint64_t *sample;
  199         
  200         sc = dev->si_drv1;
  201         u = *(u_int*)data;
  202         error = 0;
  203         switch (cmd) {
  204         case ADLINK_SETDIVISOR:
  205                 if (sc->p0->state == STATE_RUN)
  206                         return (EBUSY);
  207                 if (u & 1)
  208                         return (EINVAL);
  209                 sc->p0->divisor = u;
  210                 break;
  211         case ADLINK_SETCHUNKSIZE:
  212                 if (sc->p0->state != STATE_RESET)
  213                         return (EBUSY);
  214                 if (u % PAGE_SIZE)
  215                         return (EINVAL);
  216                 if (sc->p0->ringsize != 0 && sc->p0->ringsize % u)
  217                         return (EINVAL);
  218                 sc->p0->chunksize = u;
  219                 break;
  220         case ADLINK_SETRINGSIZE:
  221                 if (sc->p0->state != STATE_RESET)
  222                         return (EBUSY);
  223                 if (u % PAGE_SIZE)
  224                         return (EINVAL);
  225                 if (sc->p0->chunksize != 0 && u % sc->p0->chunksize)
  226                         return (EINVAL);
  227                 sc->p0->ringsize = u;
  228                 break;
  229         case ADLINK_START:
  230                 if (sc->p0->state == STATE_RUN)
  231                         return (EBUSY);
  232                 if (sc->p0->state == STATE_RESET) {
  233                         
  234                         if (sc->p0->chunksize == 0)
  235                                 sc->p0->chunksize = 4 * PAGE_SIZE;
  236                         if (sc->p0->ringsize == 0)
  237                                 sc->p0->ringsize = 16 * sc->p0->chunksize;
  238                         if (sc->p0->divisor == 0)
  239                                 sc->p0->divisor = 4;
  240 
  241                         sc->nchunks = sc->p0->ringsize / sc->p0->chunksize;
  242                         if (sc->nchunks * sizeof (*pg->sample) +
  243                             sizeof *sc->p0 > PAGE_SIZE)
  244                                 return (EINVAL);
  245                         sc->p0->o_ring = PAGE_SIZE;
  246                         sample = (uint64_t *)(sc->p0 + 1);
  247                         sc->p0->o_sample =
  248                             (uintptr_t)sample - (uintptr_t)(sc->p0);
  249                         pg = malloc(sizeof *pg * sc->nchunks,
  250                             M_DEVBUF, M_WAITOK | M_ZERO);
  251                         sc->chunks = pg;
  252                         for (i = 0; i < sc->nchunks; i++) {
  253                                 pg->sample = sample;
  254                                 *pg->sample = 0;
  255                                 sample++;
  256                                 pg->virt = contigmalloc(sc->p0->chunksize,
  257                                     M_DEVBUF, M_WAITOK,
  258                                     0ul, 0xfffffffful,
  259                                     PAGE_SIZE, 0);
  260                                 pg->phys = vtophys(pg->virt);
  261                                 if (i == sc->nchunks - 1)
  262                                         pg->next = sc->chunks;
  263                                 else
  264                                         pg->next = pg + 1;
  265                                 pg++;
  266                         }
  267                         sc->next = sc->chunks;
  268                 }
  269 
  270                 /* Reset generation numbers */
  271                 pg = sc->chunks;
  272                 for (i = 0; i < sc->nchunks; i++) {
  273                         *pg->sample = 0;
  274                         pg++;
  275                 }
  276 
  277                 /* Enable interrupts on write complete */
  278                 bus_write_4(sc->res[0], 0x38, 0x00004000);
  279 
  280                 /* Sample CH0 only */
  281                 bus_write_4(sc->res[1], 0x00, 1);
  282 
  283                 /* Divide clock by four */
  284                 bus_write_4(sc->res[1], 0x04, sc->p0->divisor);
  285 
  286                 /* Software trigger mode: software */
  287                 bus_write_4(sc->res[1], 0x08, 0);
  288 
  289                 /* Trigger level zero */
  290                 bus_write_4(sc->res[1], 0x0c, 0);
  291 
  292                 /* Trigger source CH0 (not used) */
  293                 bus_write_4(sc->res[1], 0x10, 0);
  294 
  295                 /* Fifo control/status: flush */
  296                 bus_write_4(sc->res[1], 0x18, 3);
  297 
  298                 /* Clock source: external sine */
  299                 bus_write_4(sc->res[1], 0x20, 2);
  300 
  301                 /* Chipmunks are go! */
  302                 sc->p0->state = STATE_RUN;
  303 
  304                 /* Set up Write DMA */
  305                 pg = sc->next = sc->chunks;
  306                 *(pg->sample) = 0;
  307                 bus_write_4(sc->res[0], 0x24, pg->phys);
  308                 bus_write_4(sc->res[0], 0x28, sc->p0->chunksize);
  309                 u = bus_read_4(sc->res[0], 0x3c);
  310                 bus_write_4(sc->res[0], 0x3c, u | 0x00000600);
  311 
  312                 /* Acquisition Enable Register: go! */
  313                 bus_write_4(sc->res[1], 0x1c, 1);
  314 
  315                 break;
  316         case ADLINK_STOP:
  317                 if (sc->p0->state == STATE_RESET)
  318                         break;
  319                 sc->p0->state = EINTR;  
  320                 while (*(sc->next->sample) == 0)
  321                         tsleep(sc, PUSER | PCATCH, "adstop", 1);
  322                 break;
  323 #ifdef notyet
  324         /*
  325          * I'm not sure we can actually do this.  How do we revoke
  326          * the mmap'ed pages from any process having them mmapped ?
  327          */
  328         case ADLINK_RESET:
  329                 if (sc->p0->state == STATE_RESET)
  330                         break;
  331                 sc->p0->state = EINTR;  
  332                 while (*(sc->next->samp) == 0)
  333                         tsleep(sc, PUSER | PCATCH, "adreset", 1);
  334                 /* deallocate ring buffer */
  335                 break;
  336 #endif
  337         default:
  338                 error = ENOIOCTL;
  339                 break;
  340         }
  341         return (error);
  342 }
  343 
  344 static devclass_t adlink_devclass;
  345 
  346 static int
  347 adlink_probe(device_t self)
  348 {
  349 
  350         if (pci_get_devid(self) != 0x80da10e8)
  351                 return (ENXIO);
  352         device_set_desc(self, "Adlink PCI-9812 4 ch 12 bit 20 msps");
  353         return (BUS_PROBE_DEFAULT);
  354 }
  355 
  356 static struct resource_spec adlink_res_spec[] = {
  357         { SYS_RES_IOPORT,       PCIR_BAR(0),    RF_ACTIVE},
  358         { SYS_RES_IOPORT,       PCIR_BAR(1),    RF_ACTIVE},
  359         { SYS_RES_IRQ,          0,              RF_ACTIVE | RF_SHAREABLE},
  360         { -1, 0, 0 }
  361 };
  362 
  363 static int
  364 adlink_attach(device_t self)
  365 {
  366         struct softc *sc;
  367         int i, error;
  368 
  369         sc = device_get_softc(self);
  370         bzero(sc, sizeof *sc);
  371         sc->device = self;
  372 
  373         error = bus_alloc_resources(self, adlink_res_spec, sc->res);
  374         if (error)
  375                 return (error);
  376 
  377         /* XXX why do we need INTR_MPSAFE if INTR_FAST was declared too?!?!? */
  378         i = bus_setup_intr(self, sc->res[2],
  379             INTR_MPSAFE | INTR_TYPE_MISC,
  380             adlink_intr, NULL, sc, &sc->intrhand);
  381         if (i) {
  382                 printf("adlink: Couldn't get FAST intr\n");
  383                 i = bus_setup_intr(self, sc->res[2],
  384                     INTR_MPSAFE | INTR_TYPE_MISC,
  385                     NULL, (driver_intr_t *)adlink_intr, sc, &sc->intrhand);
  386         }
  387 
  388         if (i) {
  389                 bus_release_resources(self, adlink_res_spec, sc->res);
  390                 return (ENODEV);
  391         }
  392 
  393         sc->p0 = malloc(PAGE_SIZE, M_DEVBUF, M_WAITOK | M_ZERO);
  394         sc->p0->version = PAGE0VERSION;
  395         sc->p0->state = STATE_RESET;
  396 
  397         sc->dev = make_dev(&adlink_cdevsw, device_get_unit(self),
  398             UID_ROOT, GID_WHEEL, 0444, "adlink%d", device_get_unit(self));
  399         sc->dev->si_drv1 = sc;
  400 
  401         return (0);
  402 }
  403 
  404 static device_method_t adlink_methods[] = {
  405         /* Device interface */
  406         DEVMETHOD(device_probe,         adlink_probe),
  407         DEVMETHOD(device_attach,        adlink_attach),
  408         DEVMETHOD(device_suspend,       bus_generic_suspend),
  409         DEVMETHOD(device_resume,        bus_generic_resume),
  410         DEVMETHOD(device_shutdown,      bus_generic_shutdown),
  411         {0, 0}
  412 };
  413  
  414 static driver_t adlink_driver = {
  415         "adlink",
  416         adlink_methods,
  417         sizeof(struct softc)
  418 };
  419 
  420 DRIVER_MODULE(adlink, pci, adlink_driver, adlink_devclass, 0, 0);
  421 
  422 #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
