at91_pio.c

Version: - FREEBSD - FREEBSD-13-STABLE - FREEBSD-13-0 - FREEBSD-12-STABLE - FREEBSD-12-0 - FREEBSD-11-STABLE - FREEBSD-11-0 - FREEBSD-10-STABLE - FREEBSD-10-0 - FREEBSD-9-STABLE - FREEBSD-9-0 - FREEBSD-8-STABLE - FREEBSD-8-0 - FREEBSD-7-STABLE - FREEBSD-7-0 - FREEBSD-6-STABLE - FREEBSD-6-0 - FREEBSD-5-STABLE - FREEBSD-5-0 - FREEBSD-4-STABLE - FREEBSD-3-STABLE - FREEBSD22 - l41 - OPENBSD - linux-2.6 - MK84 - PLAN9 - xnu-8792
SearchContext: - none - 3 - 10
    1 /*-
    2  * Copyright (c) 2006 M. Warner Losh.  All rights reserved.
    3  * Copyright (C) 2012 Ian Lepore. 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  *
   14  * THIS SOFTWARE IS PROVIDED BY AUTHOR AND CONTRIBUTORS ``AS IS'' AND
   15  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   16  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   17  * ARE DISCLAIMED.  IN NO EVENT SHALL AUTHOR OR CONTRIBUTORS BE LIABLE
   18  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
   19  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
   20  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
   21  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
   22  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
   23  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   24  * SUCH DAMAGE.
   25  */
   26 
   27 #include "opt_platform.h"
   28 
   29 #include <sys/cdefs.h>
   30 __FBSDID("$FreeBSD$");
   31 
   32 #include <sys/param.h>
   33 #include <sys/systm.h>
   34 #include <sys/bus.h>
   35 #include <sys/conf.h>
   36 #include <sys/kernel.h>
   37 #include <sys/lock.h>
   38 #include <sys/mbuf.h>
   39 #include <sys/malloc.h>
   40 #include <sys/module.h>
   41 #include <sys/poll.h>
   42 #include <sys/rman.h>
   43 #include <sys/selinfo.h>
   44 #include <sys/sx.h>
   45 #include <sys/uio.h>
   46 #include <machine/at91_gpio.h>
   47 #include <machine/bus.h>
   48 
   49 #include <arm/at91/at91reg.h>
   50 #include <arm/at91/at91_pioreg.h>
   51 #include <arm/at91/at91_piovar.h>
   52 
   53 #ifdef FDT
   54 #include <dev/fdt/fdt_common.h>
   55 #include <dev/ofw/ofw_bus.h>
   56 #include <dev/ofw/ofw_bus_subr.h>
   57 #endif
   58 
   59 #define MAX_CHANGE      64
   60 
   61 struct at91_pio_softc
   62 {
   63         device_t dev;                   /* Myself */
   64         void *intrhand;                 /* Interrupt handle */
   65         struct resource *irq_res;       /* IRQ resource */
   66         struct resource *mem_res;       /* Memory resource */
   67         struct sx sc_mtx;               /* basically a perimeter lock */
   68         struct cdev *cdev;
   69         struct selinfo selp;
   70         int buflen;
   71         uint8_t buf[MAX_CHANGE];
   72         int flags;
   73 #define OPENED 1
   74 };
   75 
   76 static inline uint32_t
   77 RD4(struct at91_pio_softc *sc, bus_size_t off)
   78 {
   79 
   80         return (bus_read_4(sc->mem_res, off));
   81 }
   82 
   83 static inline void
   84 WR4(struct at91_pio_softc *sc, bus_size_t off, uint32_t val)
   85 {
   86 
   87         bus_write_4(sc->mem_res, off, val);
   88 }
   89 
   90 #define AT91_PIO_LOCK(_sc)              sx_xlock(&(_sc)->sc_mtx)
   91 #define AT91_PIO_UNLOCK(_sc)            sx_xunlock(&(_sc)->sc_mtx)
   92 #define AT91_PIO_LOCK_INIT(_sc) \
   93         sx_init(&_sc->sc_mtx, device_get_nameunit(_sc->dev))
   94 #define AT91_PIO_LOCK_DESTROY(_sc)      sx_destroy(&_sc->sc_mtx);
   95 #define AT91_PIO_ASSERT_LOCKED(_sc)     sx_assert(&_sc->sc_mtx, SA_XLOCKED);
   96 #define AT91_PIO_ASSERT_UNLOCKED(_sc)   sx_assert(&_sc->sc_mtx, SA_UNLOCKED);
   97 #define CDEV2SOFTC(dev)                 ((dev)->si_drv1)
   98 
   99 static devclass_t at91_pio_devclass;
  100 
  101 /* bus entry points */
  102 
  103 static int at91_pio_probe(device_t dev);
  104 static int at91_pio_attach(device_t dev);
  105 static int at91_pio_detach(device_t dev);
  106 static void at91_pio_intr(void *);
  107 
  108 /* helper routines */
  109 static int at91_pio_activate(device_t dev);
  110 static void at91_pio_deactivate(device_t dev);
  111 
  112 /* cdev routines */
  113 static d_open_t at91_pio_open;
  114 static d_close_t at91_pio_close;
  115 static d_read_t at91_pio_read;
  116 static d_poll_t at91_pio_poll;
  117 static d_ioctl_t at91_pio_ioctl;
  118 
  119 static struct cdevsw at91_pio_cdevsw =
  120 {
  121         .d_version = D_VERSION,
  122         .d_open = at91_pio_open,
  123         .d_close = at91_pio_close,
  124         .d_read = at91_pio_read,
  125         .d_poll = at91_pio_poll,
  126         .d_ioctl = at91_pio_ioctl
  127 };
  128 
  129 static int
  130 at91_pio_probe(device_t dev)
  131 {
  132         const char *name;
  133 #ifdef FDT
  134         if (!ofw_bus_is_compatible(dev, "atmel,at91rm9200-gpio"))
  135                 return (ENXIO);
  136 #endif
  137         switch (device_get_unit(dev)) {
  138         case 0:
  139                 name = "PIOA";
  140                 break;
  141         case 1:
  142                 name = "PIOB";
  143                 break;
  144         case 2:
  145                 name = "PIOC";
  146                 break;
  147         case 3:
  148                 name = "PIOD";
  149                 break;
  150         case 4:
  151                 name = "PIOE";
  152                 break;
  153         case 5:
  154                 name = "PIOF";
  155                 break;
  156         default:
  157                 name = "PIO";
  158                 break;
  159         }
  160         device_set_desc(dev, name);
  161         return (0);
  162 }
  163 
  164 static int
  165 at91_pio_attach(device_t dev)
  166 {
  167         struct at91_pio_softc *sc;
  168         int err;
  169 
  170         sc = device_get_softc(dev);
  171         sc->dev = dev;
  172         err = at91_pio_activate(dev);
  173         if (err)
  174                 goto out;
  175 
  176         if (bootverbose)
  177                 device_printf(dev, "ABSR: %#x OSR: %#x PSR:%#x ODSR: %#x\n",
  178                     RD4(sc, PIO_ABSR), RD4(sc, PIO_OSR), RD4(sc, PIO_PSR),
  179                     RD4(sc, PIO_ODSR));
  180         AT91_PIO_LOCK_INIT(sc);
  181 
  182         /*
  183          * Activate the interrupt, but disable all interrupts in the hardware.
  184          */
  185         WR4(sc, PIO_IDR, 0xffffffff);
  186         err = bus_setup_intr(dev, sc->irq_res, INTR_TYPE_MISC,
  187             NULL, at91_pio_intr, sc, &sc->intrhand);
  188         if (err) {
  189                 AT91_PIO_LOCK_DESTROY(sc);
  190                 goto out;
  191         }
  192         sc->cdev = make_dev(&at91_pio_cdevsw, device_get_unit(dev), UID_ROOT,
  193             GID_WHEEL, 0600, "pio%d", device_get_unit(dev));
  194         if (sc->cdev == NULL) {
  195                 err = ENOMEM;
  196                 goto out;
  197         }
  198         sc->cdev->si_drv1 = sc;
  199 out:
  200         if (err)
  201                 at91_pio_deactivate(dev);
  202         return (err);
  203 }
  204 
  205 static int
  206 at91_pio_detach(device_t dev)
  207 {
  208 
  209         return (EBUSY); /* XXX */
  210 }
  211 
  212 static int
  213 at91_pio_activate(device_t dev)
  214 {
  215         struct at91_pio_softc *sc;
  216         int rid;
  217 
  218         sc = device_get_softc(dev);
  219         rid = 0;
  220         sc->mem_res = bus_alloc_resource_any(dev, SYS_RES_MEMORY, &rid,
  221             RF_ACTIVE);
  222         if (sc->mem_res == NULL)
  223                 goto errout;
  224         rid = 0;
  225         sc->irq_res = bus_alloc_resource_any(dev, SYS_RES_IRQ, &rid,
  226             RF_ACTIVE | RF_SHAREABLE);
  227         if (sc->irq_res == NULL)
  228                 goto errout;
  229         return (0);
  230 errout:
  231         at91_pio_deactivate(dev);
  232         return (ENOMEM);
  233 }
  234 
  235 static void
  236 at91_pio_deactivate(device_t dev)
  237 {
  238         struct at91_pio_softc *sc;
  239 
  240         sc = device_get_softc(dev);
  241         if (sc->intrhand)
  242                 bus_teardown_intr(dev, sc->irq_res, sc->intrhand);
  243         sc->intrhand = 0;
  244         bus_generic_detach(sc->dev);
  245         if (sc->mem_res)
  246                 bus_release_resource(dev, SYS_RES_MEMORY,
  247                     rman_get_rid(sc->mem_res), sc->mem_res);
  248         sc->mem_res = 0;
  249         if (sc->irq_res)
  250                 bus_release_resource(dev, SYS_RES_IRQ,
  251                     rman_get_rid(sc->irq_res), sc->irq_res);
  252         sc->irq_res = 0;
  253 }
  254 
  255 static void
  256 at91_pio_intr(void *xsc)
  257 {
  258         struct at91_pio_softc *sc = xsc;
  259         uint32_t status;
  260         int i;
  261 
  262         /* Reading the status also clears the interrupt. */
  263         status = RD4(sc, PIO_ISR) & RD4(sc, PIO_IMR);
  264         if (status != 0) {
  265                 AT91_PIO_LOCK(sc);
  266                 for (i = 0; status != 0 && sc->buflen < MAX_CHANGE; ++i) {
  267                         if (status & 1)
  268                                 sc->buf[sc->buflen++] = (uint8_t)i;
  269                         status >>= 1;
  270                 }
  271                 AT91_PIO_UNLOCK(sc);
  272                 wakeup(sc);
  273                 selwakeup(&sc->selp);
  274         }
  275 }
  276 
  277 static int
  278 at91_pio_open(struct cdev *dev, int oflags, int devtype, struct thread *td)
  279 {
  280         struct at91_pio_softc *sc;
  281 
  282         sc = CDEV2SOFTC(dev);
  283         AT91_PIO_LOCK(sc);
  284         if (!(sc->flags & OPENED)) {
  285                 sc->flags |= OPENED;
  286         }
  287         AT91_PIO_UNLOCK(sc);
  288         return (0);
  289 }
  290 
  291 static int
  292 at91_pio_close(struct cdev *dev, int fflag, int devtype, struct thread *td)
  293 {
  294         struct at91_pio_softc *sc;
  295 
  296         sc = CDEV2SOFTC(dev);
  297         AT91_PIO_LOCK(sc);
  298         sc->flags &= ~OPENED;
  299         AT91_PIO_UNLOCK(sc);
  300         return (0);
  301 }
  302 
  303 static int
  304 at91_pio_poll(struct cdev *dev, int events, struct thread *td)
  305 {
  306         struct at91_pio_softc *sc;
  307         int revents = 0;
  308 
  309         sc = CDEV2SOFTC(dev);
  310         AT91_PIO_LOCK(sc);
  311         if (events & (POLLIN | POLLRDNORM)) {
  312                 if (sc->buflen != 0)
  313                         revents |= events & (POLLIN | POLLRDNORM);
  314                 else
  315                         selrecord(td, &sc->selp);
  316         }
  317         AT91_PIO_UNLOCK(sc);
  318 
  319         return (revents);
  320 }
  321 
  322 static int
  323 at91_pio_read(struct cdev *dev, struct uio *uio, int flag)
  324 {
  325         struct at91_pio_softc *sc;
  326         int err, ret, len;
  327 
  328         sc = CDEV2SOFTC(dev);
  329         AT91_PIO_LOCK(sc);
  330         err = 0;
  331         ret = 0;
  332         while (uio->uio_resid) {
  333                 while (sc->buflen == 0 && err == 0)
  334                         err = msleep(sc, &sc->sc_mtx, PCATCH | PZERO, "prd", 0);
  335                 if (err != 0)
  336                         break;
  337                 len = MIN(sc->buflen, uio->uio_resid);
  338                 err = uiomove(sc->buf, len, uio);
  339                 if (err != 0)
  340                         break;
  341                 /*
  342                  * If we read the whole thing no datacopy is needed,
  343                  * otherwise we move the data down.
  344                  */
  345                 ret += len;
  346                 if (sc->buflen == len)
  347                         sc->buflen = 0;
  348                 else {
  349                         bcopy(sc->buf + len, sc->buf, sc->buflen - len);
  350                         sc->buflen -= len;
  351                 }
  352                 /* If there's no data left, end the read. */
  353                 if (sc->buflen == 0)
  354                         break;
  355         }
  356         AT91_PIO_UNLOCK(sc);
  357         return (err);
  358 }
  359 
  360 static void
  361 at91_pio_bang32(struct at91_pio_softc *sc, uint32_t bits, uint32_t datapin,
  362     uint32_t clockpin)
  363 {
  364         int i;
  365 
  366         for (i = 0; i < 32; i++) {
  367                 if (bits & 0x80000000)
  368                         WR4(sc, PIO_SODR, datapin);
  369                 else
  370                         WR4(sc, PIO_CODR, datapin);
  371                 bits <<= 1;
  372                 WR4(sc, PIO_CODR, clockpin);
  373                 WR4(sc, PIO_SODR, clockpin);
  374         }
  375 }
  376 
  377 static void
  378 at91_pio_bang(struct at91_pio_softc *sc, uint8_t bits, uint32_t bitcount, 
  379               uint32_t datapin, uint32_t clockpin)
  380 {
  381         int i;
  382 
  383         for (i = 0; i < bitcount; i++) {
  384                 if (bits & 0x80)
  385                         WR4(sc, PIO_SODR, datapin);
  386                 else
  387                         WR4(sc, PIO_CODR, datapin);
  388                 bits <<= 1;
  389                 WR4(sc, PIO_CODR, clockpin);
  390                 WR4(sc, PIO_SODR, clockpin);
  391         }
  392 }
  393 
  394 static int
  395 at91_pio_ioctl(struct cdev *dev, u_long cmd, caddr_t data, int fflag,
  396     struct thread *td)
  397 {
  398         struct at91_pio_softc *sc;
  399         struct at91_gpio_cfg *cfg;
  400         struct at91_gpio_info *info;
  401         struct at91_gpio_bang *bang;
  402         struct at91_gpio_bang_many *bangmany;
  403         uint32_t i, num;
  404         uint8_t many[1024], *walker;
  405         int err;
  406         int bitcount;
  407 
  408         sc = CDEV2SOFTC(dev);
  409         switch(cmd) {
  410         case AT91_GPIO_SET:     /* turn bits on */
  411                 WR4(sc, PIO_SODR, *(uint32_t *)data);
  412                 return (0);
  413         case AT91_GPIO_CLR:     /* turn bits off */
  414                 WR4(sc, PIO_CODR, *(uint32_t *)data);
  415                 return (0);
  416         case AT91_GPIO_READ:    /* Get the status of input bits */
  417                 *(uint32_t *)data = RD4(sc, PIO_PDSR);
  418                 return (0);
  419         case AT91_GPIO_CFG:     /* Configure AT91_GPIO pins */
  420                 cfg = (struct at91_gpio_cfg *)data;
  421                 if (cfg->cfgmask & AT91_GPIO_CFG_INPUT) {
  422                         WR4(sc, PIO_OER, cfg->iomask & ~cfg->input);
  423                         WR4(sc, PIO_ODR, cfg->iomask & cfg->input);
  424                 }
  425                 if (cfg->cfgmask & AT91_GPIO_CFG_HI_Z) {
  426                         WR4(sc, PIO_MDDR, cfg->iomask & ~cfg->hi_z);
  427                         WR4(sc, PIO_MDER, cfg->iomask & cfg->hi_z);
  428                 }
  429                 if (cfg->cfgmask & AT91_GPIO_CFG_PULLUP) {
  430                         WR4(sc, PIO_PUDR, cfg->iomask & ~cfg->pullup);
  431                         WR4(sc, PIO_PUER, cfg->iomask & cfg->pullup);
  432                 }
  433                 if (cfg->cfgmask & AT91_GPIO_CFG_GLITCH) {
  434                         WR4(sc, PIO_IFDR, cfg->iomask & ~cfg->glitch);
  435                         WR4(sc, PIO_IFER, cfg->iomask & cfg->glitch);
  436                 }
  437                 if (cfg->cfgmask & AT91_GPIO_CFG_GPIO) {
  438                         WR4(sc, PIO_PDR, cfg->iomask & ~cfg->gpio);
  439                         WR4(sc, PIO_PER, cfg->iomask & cfg->gpio);
  440                 }
  441                 if (cfg->cfgmask & AT91_GPIO_CFG_PERIPH) {
  442                         WR4(sc, PIO_ASR, cfg->iomask & ~cfg->periph);
  443                         WR4(sc, PIO_BSR, cfg->iomask & cfg->periph);
  444                 }
  445                 if (cfg->cfgmask & AT91_GPIO_CFG_INTR) {
  446                         WR4(sc, PIO_IDR, cfg->iomask & ~cfg->intr);
  447                         WR4(sc, PIO_IER, cfg->iomask & cfg->intr);
  448                 }
  449                 return (0);
  450         case AT91_GPIO_BANG:
  451                 bang = (struct at91_gpio_bang *)data;
  452                 at91_pio_bang32(sc, bang->bits, bang->datapin, bang->clockpin);
  453                 return (0);
  454         case AT91_GPIO_BANG_MANY:
  455                 bangmany = (struct at91_gpio_bang_many *)data;
  456                 walker = (uint8_t *)bangmany->bits;
  457                 bitcount = bangmany->numbits;
  458                 while (bitcount > 0) {
  459                         num = MIN((bitcount + 7) / 8, sizeof(many));
  460                         err = copyin(walker, many, num);
  461                         if (err)
  462                                 return err;
  463                         for (i = 0; i < num && bitcount > 0; i++, bitcount -= 8) 
  464                                 if (bitcount >= 8)
  465                                         at91_pio_bang(sc, many[i], 8, bangmany->datapin, bangmany->clockpin);
  466                                 else
  467                                         at91_pio_bang(sc, many[i], bitcount, bangmany->datapin, bangmany->clockpin);
  468                         walker += num;
  469                 }
  470                 return (0);
  471         case AT91_GPIO_INFO:    /* Learn about this device's AT91_GPIO bits */
  472                 info = (struct at91_gpio_info *)data;
  473                 info->output_status = RD4(sc, PIO_ODSR);
  474                 info->input_status = RD4(sc, PIO_OSR);
  475                 info->highz_status = RD4(sc, PIO_MDSR);
  476                 info->pullup_status = RD4(sc, PIO_PUSR);
  477                 info->glitch_status = RD4(sc, PIO_IFSR);
  478                 info->enabled_status = RD4(sc, PIO_PSR);
  479                 info->periph_status = RD4(sc, PIO_ABSR);
  480                 info->intr_status = RD4(sc, PIO_IMR);
  481                 memset(info->extra_status, 0, sizeof(info->extra_status));
  482                 return (0);
  483         }
  484         return (ENOTTY);
  485 }
  486 
  487 /*
  488  * The following functions are called early in the boot process, so
  489  * don't use bus_space, as that isn't yet available when we need to use
  490  * them.
  491  */
  492 
  493 void
  494 at91_pio_use_periph_a(uint32_t pio, uint32_t periph_a_mask, int use_pullup)
  495 {
  496         uint32_t *PIO = (uint32_t *)(AT91_BASE + pio);
  497 
  498         PIO[PIO_ASR / 4] = periph_a_mask;
  499         PIO[PIO_PDR / 4] = periph_a_mask;
  500         if (use_pullup)
  501                 PIO[PIO_PUER / 4] = periph_a_mask;
  502         else
  503                 PIO[PIO_PUDR / 4] = periph_a_mask;
  504 }
  505 
  506 void
  507 at91_pio_use_periph_b(uint32_t pio, uint32_t periph_b_mask, int use_pullup)
  508 {
  509         uint32_t *PIO = (uint32_t *)(AT91_BASE + pio);
  510 
  511         PIO[PIO_BSR / 4] = periph_b_mask;
  512         PIO[PIO_PDR / 4] = periph_b_mask;
  513         if (use_pullup)
  514                 PIO[PIO_PUER / 4] = periph_b_mask;
  515         else
  516                 PIO[PIO_PUDR / 4] = periph_b_mask;
  517 }
  518 
  519 void
  520 at91_pio_use_gpio(uint32_t pio, uint32_t gpio_mask)
  521 {
  522         uint32_t *PIO = (uint32_t *)(AT91_BASE + pio);
  523 
  524         PIO[PIO_PER / 4] = gpio_mask;
  525 }
  526 
  527 void
  528 at91_pio_gpio_input(uint32_t pio, uint32_t input_enable_mask)
  529 {
  530         uint32_t *PIO = (uint32_t *)(AT91_BASE + pio);
  531 
  532         PIO[PIO_ODR / 4] = input_enable_mask;
  533 }
  534 
  535 void
  536 at91_pio_gpio_output(uint32_t pio, uint32_t output_enable_mask, int use_pullup)
  537 {
  538         uint32_t *PIO = (uint32_t *)(AT91_BASE + pio);
  539 
  540         PIO[PIO_OER / 4] = output_enable_mask;
  541         if (use_pullup)
  542                 PIO[PIO_PUER / 4] = output_enable_mask;
  543         else
  544                 PIO[PIO_PUDR / 4] = output_enable_mask;
  545 }
  546 
  547 void
  548 at91_pio_gpio_high_z(uint32_t pio, uint32_t high_z_mask, int enable)
  549 {
  550         uint32_t *PIO = (uint32_t *)(AT91_BASE + pio);
  551 
  552         if (enable)
  553                 PIO[PIO_MDER / 4] = high_z_mask;
  554         else
  555                 PIO[PIO_MDDR / 4] = high_z_mask;
  556 }
  557 
  558 void
  559 at91_pio_gpio_set(uint32_t pio, uint32_t data_mask)
  560 {
  561         uint32_t *PIO = (uint32_t *)(AT91_BASE + pio);
  562 
  563         PIO[PIO_SODR / 4] = data_mask;
  564 }
  565 
  566 void
  567 at91_pio_gpio_clear(uint32_t pio, uint32_t data_mask)
  568 {
  569         uint32_t *PIO = (uint32_t *)(AT91_BASE + pio);
  570 
  571         PIO[PIO_CODR / 4] = data_mask;
  572 }
  573 
  574 uint32_t
  575 at91_pio_gpio_get(uint32_t pio, uint32_t data_mask)
  576 {
  577         uint32_t *PIO = (uint32_t *)(AT91_BASE + pio);
  578 
  579         return (PIO[PIO_PDSR / 4] & data_mask);
  580 }
  581 
  582 void
  583 at91_pio_gpio_set_deglitch(uint32_t pio, uint32_t data_mask, int use_deglitch)
  584 {
  585         uint32_t *PIO = (uint32_t *)(AT91_BASE + pio);
  586 
  587         if (use_deglitch)
  588                 PIO[PIO_IFER / 4] = data_mask;
  589         else
  590                 PIO[PIO_IFDR / 4] = data_mask;
  591 }
  592 
  593 void
  594 at91_pio_gpio_pullup(uint32_t pio, uint32_t data_mask, int do_pullup)
  595 {
  596         uint32_t *PIO = (uint32_t *)(AT91_BASE + pio);
  597 
  598         if (do_pullup)
  599                 PIO[PIO_PUER / 4] = data_mask;
  600         else
  601                 PIO[PIO_PUDR / 4] = data_mask;
  602 }
  603 
  604 void
  605 at91_pio_gpio_set_interrupt(uint32_t pio, uint32_t data_mask,
  606         int enable_interrupt)
  607 {
  608         uint32_t *PIO = (uint32_t *)(AT91_BASE + pio);
  609 
  610         if (enable_interrupt)
  611                 PIO[PIO_IER / 4] = data_mask;
  612         else
  613                 PIO[PIO_IDR / 4] = data_mask;
  614 }
  615 
  616 uint32_t
  617 at91_pio_gpio_clear_interrupt(uint32_t pio)
  618 {
  619         uint32_t *PIO = (uint32_t *)(AT91_BASE + pio);
  620 
  621         /* Reading this register will clear the interrupts. */
  622         return (PIO[PIO_ISR / 4]);
  623 }
  624 
  625 static void
  626 at91_pio_new_pass(device_t dev)
  627 {
  628 
  629         device_printf(dev, "Pass %d\n", bus_current_pass);
  630 }
  631 
  632 static device_method_t at91_pio_methods[] = {
  633         /* Device interface */
  634         DEVMETHOD(device_probe,         at91_pio_probe),
  635         DEVMETHOD(device_attach,        at91_pio_attach),
  636         DEVMETHOD(device_detach,        at91_pio_detach),
  637 
  638         DEVMETHOD(bus_new_pass,         at91_pio_new_pass),
  639 
  640         DEVMETHOD_END
  641 };
  642 
  643 static driver_t at91_pio_driver = {
  644         "at91_pio",
  645         at91_pio_methods,
  646         sizeof(struct at91_pio_softc),
  647 };
  648 
  649 EARLY_DRIVER_MODULE(at91_pio, at91_pinctrl, at91_pio_driver, at91_pio_devclass,
  650     NULL, NULL, BUS_PASS_INTERRUPT);
Cache object: ab739430056080b91ea117dbaac3614e
[ source navigation ] [ diff markup ] [ identifier search ] [ freetext search ] [ file search ] [ list types ] [ track identifier ]
This page is part of the FreeBSD/Linux Linux Kernel Cross-Reference, and was automatically generated using a modified version of the LXR engine.
FreeBSD/Linux Kernel Cross Reference sys/arm/at91/at91_pio.c

FreeBSD/Linux Kernel Cross Reference
sys/arm/at91/at91_pio.c
