The Design and Implementation of the FreeBSD Operating System, Second Edition
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FreeBSD/Linux Kernel Cross Reference
sys/arm/ti/ti_pruss.c

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    1 /*-
    2  * Copyright (c) 2013 Rui Paulo <rpaulo@FreeBSD.org>
    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  *
   14  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
   15  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
   16  * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
   17  * DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT,
   18  * INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
   19  * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
   20  * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
   21  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
   22  * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
   23  * ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
   24  * POSSIBILITY OF SUCH DAMAGE.
   25  */
   26 #include <sys/cdefs.h>
   27 __FBSDID("$FreeBSD: releng/10.2/sys/arm/ti/ti_pruss.c 278432 2015-02-09 02:49:10Z rpaulo $");
   28 
   29 #include <sys/param.h>
   30 #include <sys/systm.h>
   31 #include <sys/bus.h>
   32 #include <sys/conf.h>
   33 #include <sys/kernel.h>
   34 #include <sys/module.h>
   35 #include <sys/malloc.h>
   36 #include <sys/rman.h>
   37 #include <sys/event.h>
   38 #include <sys/selinfo.h>
   39 #include <machine/bus.h>
   40 #include <machine/cpu.h>
   41 #include <machine/frame.h>
   42 #include <machine/intr.h>
   43 
   44 #include <dev/fdt/fdt_common.h>
   45 #include <dev/ofw/openfirm.h>
   46 #include <dev/ofw/ofw_bus.h>
   47 #include <dev/ofw/ofw_bus_subr.h>
   48 
   49 #include <machine/bus.h>
   50 #include <machine/fdt.h>
   51 
   52 #include <arm/ti/ti_prcm.h>
   53 #include <arm/ti/ti_pruss.h>
   54 
   55 #define DEBUG
   56 #ifdef DEBUG
   57 #define DPRINTF(fmt, ...)       do {    \
   58         printf("%s: ", __func__);       \
   59         printf(fmt, __VA_ARGS__);       \
   60 } while (0)
   61 #else
   62 #define DPRINTF(fmt, ...)
   63 #endif
   64 
   65 static device_probe_t           ti_pruss_probe;
   66 static device_attach_t          ti_pruss_attach;
   67 static device_detach_t          ti_pruss_detach;
   68 static void                     ti_pruss_intr(void *);
   69 static d_open_t                 ti_pruss_open;
   70 static d_mmap_t                 ti_pruss_mmap;
   71 static void                     ti_pruss_kq_read_detach(struct knote *);
   72 static int                      ti_pruss_kq_read_event(struct knote *, long);
   73 static d_kqfilter_t             ti_pruss_kqfilter;
   74 
   75 #define TI_PRUSS_IRQS   8
   76 struct ti_pruss_softc {
   77         struct mtx              sc_mtx;
   78         struct resource         *sc_mem_res;
   79         struct resource         *sc_irq_res[TI_PRUSS_IRQS];
   80         void                    *sc_intr[TI_PRUSS_IRQS];
   81         bus_space_tag_t         sc_bt;
   82         bus_space_handle_t      sc_bh;
   83         struct cdev             *sc_pdev;
   84         struct selinfo          sc_selinfo;
   85 };
   86 
   87 static struct cdevsw ti_pruss_cdevsw = {
   88         .d_version =    D_VERSION,
   89         .d_name =       "ti_pruss",
   90         .d_open =       ti_pruss_open,
   91         .d_mmap =       ti_pruss_mmap,
   92         .d_kqfilter =   ti_pruss_kqfilter,
   93 };
   94 
   95 static device_method_t ti_pruss_methods[] = {
   96         DEVMETHOD(device_probe,         ti_pruss_probe),
   97         DEVMETHOD(device_attach,        ti_pruss_attach),
   98         DEVMETHOD(device_detach,        ti_pruss_detach),
   99 
  100         DEVMETHOD_END
  101 };
  102 
  103 static driver_t ti_pruss_driver = {
  104         "ti_pruss",
  105         ti_pruss_methods,
  106         sizeof(struct ti_pruss_softc)
  107 };
  108 
  109 static devclass_t ti_pruss_devclass;
  110 
  111 DRIVER_MODULE(ti_pruss, simplebus, ti_pruss_driver, ti_pruss_devclass, 0, 0);
  112 
  113 static struct resource_spec ti_pruss_irq_spec[] = {
  114         { SYS_RES_IRQ,      0,  RF_ACTIVE },
  115         { SYS_RES_IRQ,      1,  RF_ACTIVE },
  116         { SYS_RES_IRQ,      2,  RF_ACTIVE },
  117         { SYS_RES_IRQ,      3,  RF_ACTIVE },
  118         { SYS_RES_IRQ,      4,  RF_ACTIVE },
  119         { SYS_RES_IRQ,      5,  RF_ACTIVE },
  120         { SYS_RES_IRQ,      6,  RF_ACTIVE },
  121         { SYS_RES_IRQ,      7,  RF_ACTIVE },
  122         { -1,               0,  0 }
  123 };
  124 
  125 static struct ti_pruss_irq_arg {
  126         int                    irq;
  127         struct ti_pruss_softc *sc;
  128 } ti_pruss_irq_args[TI_PRUSS_IRQS];
  129 
  130 static __inline uint32_t
  131 ti_pruss_reg_read(struct ti_pruss_softc *sc, uint32_t reg)
  132 {
  133         return (bus_space_read_4(sc->sc_bt, sc->sc_bh, reg));
  134 }
  135 
  136 static __inline void
  137 ti_pruss_reg_write(struct ti_pruss_softc *sc, uint32_t reg, uint32_t val)
  138 {
  139         bus_space_write_4(sc->sc_bt, sc->sc_bh, reg, val);
  140 }
  141 
  142 static int
  143 ti_pruss_probe(device_t dev)
  144 {
  145 
  146         if (!ofw_bus_status_okay(dev))
  147                 return (ENXIO);
  148 
  149         if (ofw_bus_is_compatible(dev, "ti,pruss-v1") ||
  150             ofw_bus_is_compatible(dev, "ti,pruss-v2")) {
  151                 device_set_desc(dev, "TI Programmable Realtime Unit Subsystem");
  152                 return (BUS_PROBE_DEFAULT);
  153         }
  154 
  155         return (ENXIO);
  156 }
  157 
  158 static int
  159 ti_pruss_attach(device_t dev)
  160 {
  161         struct ti_pruss_softc *sc;
  162         int rid, i;
  163 
  164         if (ti_prcm_clk_enable(PRUSS_CLK) != 0) {
  165                 device_printf(dev, "could not enable PRUSS clock\n");
  166                 return (ENXIO);
  167         }
  168         sc = device_get_softc(dev);
  169         rid = 0;
  170         mtx_init(&sc->sc_mtx, "TI PRUSS", NULL, MTX_DEF);
  171         sc->sc_mem_res = bus_alloc_resource_any(dev, SYS_RES_MEMORY, &rid,
  172             RF_ACTIVE);
  173         if (sc->sc_mem_res == NULL) {
  174                 device_printf(dev, "could not allocate memory resource\n");
  175                 return (ENXIO);
  176         }
  177         sc->sc_bt = rman_get_bustag(sc->sc_mem_res);
  178         sc->sc_bh = rman_get_bushandle(sc->sc_mem_res);
  179         if (bus_alloc_resources(dev, ti_pruss_irq_spec, sc->sc_irq_res) != 0) {
  180                 device_printf(dev, "could not allocate interrupt resource\n");
  181                 ti_pruss_detach(dev);
  182                 return (ENXIO);
  183         }
  184         for (i = 0; i < TI_PRUSS_IRQS; i++) {
  185                 ti_pruss_irq_args[i].irq = i;
  186                 ti_pruss_irq_args[i].sc = sc;
  187                 if (bus_setup_intr(dev, sc->sc_irq_res[i],
  188                     INTR_MPSAFE | INTR_TYPE_MISC,
  189                     NULL, ti_pruss_intr, &ti_pruss_irq_args[i],
  190                     &sc->sc_intr[i]) != 0) {
  191                         device_printf(dev,
  192                             "unable to setup the interrupt handler\n");
  193                         ti_pruss_detach(dev);
  194                         return (ENXIO);
  195                 }
  196         }
  197         if (ti_pruss_reg_read(sc, PRUSS_AM18XX_INTC) == PRUSS_AM18XX_REV)
  198                 device_printf(dev, "AM18xx PRU-ICSS\n");
  199         else if (ti_pruss_reg_read(sc, PRUSS_AM33XX_INTC) == PRUSS_AM33XX_REV)
  200                 device_printf(dev, "AM33xx PRU-ICSS\n");
  201 
  202         sc->sc_pdev = make_dev(&ti_pruss_cdevsw, 0, UID_ROOT, GID_WHEEL,
  203             0600, "pruss%d", device_get_unit(dev));
  204         sc->sc_pdev->si_drv1 = dev;
  205 
  206         return (0);
  207 }
  208 
  209 static int
  210 ti_pruss_detach(device_t dev)
  211 {
  212         struct ti_pruss_softc *sc;
  213         int i;
  214 
  215         sc = device_get_softc(dev);
  216         for (i = 0; i < TI_PRUSS_IRQS; i++) {
  217                 if (sc->sc_intr[i])
  218                         bus_teardown_intr(dev, sc->sc_irq_res[i], sc->sc_intr[i]);
  219                 if (sc->sc_irq_res[i])
  220                         bus_release_resource(dev, SYS_RES_IRQ,
  221                             rman_get_rid(sc->sc_irq_res[i]),
  222                             sc->sc_irq_res[i]);
  223         }
  224         if (sc->sc_mem_res)
  225                 bus_release_resource(dev, SYS_RES_MEMORY, rman_get_rid(sc->sc_mem_res),
  226                     sc->sc_mem_res);
  227         if (sc->sc_pdev)
  228                 destroy_dev(sc->sc_pdev);
  229 
  230         return (0);
  231 }
  232 
  233 static void
  234 ti_pruss_intr(void *arg)
  235 {
  236         struct ti_pruss_irq_arg *iap;
  237         struct ti_pruss_softc *sc;
  238 
  239         iap = arg;
  240         sc = iap->sc;
  241         DPRINTF("interrupt %p", sc);
  242         KNOTE_UNLOCKED(&sc->sc_selinfo.si_note, iap->irq);
  243 }
  244 
  245 static int
  246 ti_pruss_open(struct cdev *cdev __unused, int oflags __unused,
  247     int devtype __unused, struct thread *td __unused)
  248 {
  249         return (0);
  250 }
  251 
  252 static int
  253 ti_pruss_mmap(struct cdev *cdev, vm_ooffset_t offset, vm_paddr_t *paddr,
  254     int nprot, vm_memattr_t *memattr)
  255 {
  256         device_t dev = cdev->si_drv1;
  257         struct ti_pruss_softc *sc = device_get_softc(dev);
  258 
  259         if (offset > rman_get_size(sc->sc_mem_res))
  260                 return (-1);
  261         *paddr = rman_get_start(sc->sc_mem_res) + offset;
  262         *memattr = VM_MEMATTR_UNCACHEABLE;
  263 
  264         return (0);
  265 }
  266 
  267 static struct filterops ti_pruss_kq_read = {
  268         .f_isfd = 1,
  269         .f_detach = ti_pruss_kq_read_detach,
  270         .f_event = ti_pruss_kq_read_event,
  271 };
  272 
  273 static void
  274 ti_pruss_kq_read_detach(struct knote *kn)
  275 {
  276         struct ti_pruss_softc *sc = kn->kn_hook;
  277 
  278         knlist_remove(&sc->sc_selinfo.si_note, kn, 0);
  279 }
  280 
  281 static int
  282 ti_pruss_kq_read_event(struct knote *kn, long hint)
  283 {
  284         kn->kn_data = hint;
  285 
  286         return (hint);
  287 }
  288 
  289 static int
  290 ti_pruss_kqfilter(struct cdev *cdev, struct knote *kn)
  291 {
  292         device_t dev = cdev->si_drv1;
  293         struct ti_pruss_softc *sc = device_get_softc(dev);
  294 
  295         switch (kn->kn_filter) {
  296         case EVFILT_READ:
  297                 kn->kn_hook = sc;
  298                 kn->kn_fop = &ti_pruss_kq_read;
  299                 knlist_add(&sc->sc_selinfo.si_note, kn, 1);
  300                 break;
  301         default:
  302                 return (EINVAL);
  303         }
  304 
  305         return (0);
  306 }

Cache object: 898c104137f295983d6cef86017f5e28


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