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/10.1/sys/arm/ti/ti_pruss.c 266152 2014-05-15 16:11:06Z ian $");
   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_close_t                ti_pruss_close;
   71 static d_mmap_t                 ti_pruss_mmap;
   72 static void                     ti_pruss_kq_read_detach(struct knote *);
   73 static int                      ti_pruss_kq_read_event(struct knote *, long);
   74 static d_kqfilter_t             ti_pruss_kqfilter;
   75 
   76 #define TI_PRUSS_IRQS   8
   77 struct ti_pruss_softc {
   78         struct mtx              sc_mtx;
   79         struct resource         *sc_mem_res;
   80         struct resource         *sc_irq_res[TI_PRUSS_IRQS];
   81         void                    *sc_intr[TI_PRUSS_IRQS];
   82         bus_space_tag_t         sc_bt;
   83         bus_space_handle_t      sc_bh;
   84         struct cdev             *sc_pdev;
   85         struct selinfo          sc_selinfo;
   86         uint32_t                sc_inuse;
   87 };
   88 
   89 static struct cdevsw ti_pruss_cdevsw = {
   90         .d_version =    D_VERSION,
   91         .d_name =       "ti_pruss",
   92         .d_open =       ti_pruss_open,
   93         .d_close =      ti_pruss_close,
   94         .d_mmap =       ti_pruss_mmap,
   95         .d_kqfilter =   ti_pruss_kqfilter,
   96 };
   97 
   98 static device_method_t ti_pruss_methods[] = {
   99         DEVMETHOD(device_probe,         ti_pruss_probe),
  100         DEVMETHOD(device_attach,        ti_pruss_attach),
  101         DEVMETHOD(device_detach,        ti_pruss_detach),
  102 
  103         DEVMETHOD_END
  104 };
  105 
  106 static driver_t ti_pruss_driver = {
  107         "ti_pruss",
  108         ti_pruss_methods,
  109         sizeof(struct ti_pruss_softc)
  110 };
  111 
  112 static devclass_t ti_pruss_devclass;
  113 
  114 DRIVER_MODULE(ti_pruss, simplebus, ti_pruss_driver, ti_pruss_devclass, 0, 0);
  115 
  116 static struct resource_spec ti_pruss_irq_spec[] = {
  117         { SYS_RES_IRQ,      0,  RF_ACTIVE },
  118         { SYS_RES_IRQ,      1,  RF_ACTIVE },
  119         { SYS_RES_IRQ,      2,  RF_ACTIVE },
  120         { SYS_RES_IRQ,      3,  RF_ACTIVE },
  121         { SYS_RES_IRQ,      4,  RF_ACTIVE },
  122         { SYS_RES_IRQ,      5,  RF_ACTIVE },
  123         { SYS_RES_IRQ,      6,  RF_ACTIVE },
  124         { SYS_RES_IRQ,      7,  RF_ACTIVE },
  125         { -1,               0,  0 }
  126 };
  127 
  128 static struct ti_pruss_irq_arg {
  129         int                    irq;
  130         struct ti_pruss_softc *sc;
  131 } ti_pruss_irq_args[TI_PRUSS_IRQS];
  132 
  133 static __inline uint32_t
  134 ti_pruss_reg_read(struct ti_pruss_softc *sc, uint32_t reg)
  135 {
  136         return (bus_space_read_4(sc->sc_bt, sc->sc_bh, reg));
  137 }
  138 
  139 static __inline void
  140 ti_pruss_reg_write(struct ti_pruss_softc *sc, uint32_t reg, uint32_t val)
  141 {
  142         bus_space_write_4(sc->sc_bt, sc->sc_bh, reg, val);
  143 }
  144 
  145 static int
  146 ti_pruss_probe(device_t dev)
  147 {
  148 
  149         if (!ofw_bus_status_okay(dev))
  150                 return (ENXIO);
  151 
  152         if (ofw_bus_is_compatible(dev, "ti,pruss-v1") ||
  153             ofw_bus_is_compatible(dev, "ti,pruss-v2")) {
  154                 device_set_desc(dev, "TI Programmable Realtime Unit Subsystem");
  155                 return (BUS_PROBE_DEFAULT);
  156         }
  157 
  158         return (ENXIO);
  159 }
  160 
  161 static int
  162 ti_pruss_attach(device_t dev)
  163 {
  164         struct ti_pruss_softc *sc;
  165         int rid, i;
  166 
  167         if (ti_prcm_clk_enable(PRUSS_CLK) != 0) {
  168                 device_printf(dev, "could not enable PRUSS clock\n");
  169                 return (ENXIO);
  170         }
  171         sc = device_get_softc(dev);
  172         rid = 0;
  173         mtx_init(&sc->sc_mtx, "TI PRUSS", NULL, MTX_DEF);
  174         sc->sc_mem_res = bus_alloc_resource_any(dev, SYS_RES_MEMORY, &rid,
  175             RF_ACTIVE);
  176         if (sc->sc_mem_res == NULL) {
  177                 device_printf(dev, "could not allocate memory resource\n");
  178                 return (ENXIO);
  179         }
  180         sc->sc_bt = rman_get_bustag(sc->sc_mem_res);
  181         sc->sc_bh = rman_get_bushandle(sc->sc_mem_res);
  182         if (bus_alloc_resources(dev, ti_pruss_irq_spec, sc->sc_irq_res) != 0) {
  183                 device_printf(dev, "could not allocate interrupt resource\n");
  184                 ti_pruss_detach(dev);
  185                 return (ENXIO);
  186         }
  187         for (i = 0; i < TI_PRUSS_IRQS; i++) {
  188                 ti_pruss_irq_args[i].irq = i;
  189                 ti_pruss_irq_args[i].sc = sc;
  190                 if (bus_setup_intr(dev, sc->sc_irq_res[i], 
  191                     INTR_MPSAFE | INTR_TYPE_MISC,
  192                     NULL, ti_pruss_intr, &ti_pruss_irq_args[i], 
  193                     &sc->sc_intr[i]) != 0) {
  194                         device_printf(dev, 
  195                             "unable to setup the interrupt handler\n");
  196                         ti_pruss_detach(dev);
  197                         return (ENXIO);
  198                 }
  199         }
  200         if (ti_pruss_reg_read(sc, PRUSS_AM18XX_INTC) == PRUSS_AM18XX_REV)
  201                 device_printf(dev, "AM18xx PRU-ICSS\n");
  202         else if (ti_pruss_reg_read(sc, PRUSS_AM33XX_INTC) == PRUSS_AM33XX_REV)
  203                 device_printf(dev, "AM33xx PRU-ICSS\n");
  204 
  205         sc->sc_pdev = make_dev(&ti_pruss_cdevsw, 0, UID_ROOT, GID_WHEEL,
  206             0600, "pruss%d", device_get_unit(dev));
  207         sc->sc_pdev->si_drv1 = dev;
  208 
  209         return (0);
  210 }
  211 
  212 static int
  213 ti_pruss_detach(device_t dev)
  214 {
  215         struct ti_pruss_softc *sc;
  216         int i;
  217 
  218         sc = device_get_softc(dev);
  219         for (i = 0; i < TI_PRUSS_IRQS; i++) {
  220                 if (sc->sc_intr[i])
  221                         bus_teardown_intr(dev, sc->sc_irq_res[i], sc->sc_intr[i]);
  222                 if (sc->sc_irq_res[i])
  223                         bus_release_resource(dev, SYS_RES_IRQ, 
  224                             rman_get_rid(sc->sc_irq_res[i]),
  225                             sc->sc_irq_res[i]);
  226         }
  227         if (sc->sc_mem_res)
  228                 bus_release_resource(dev, SYS_RES_MEMORY, rman_get_rid(sc->sc_mem_res),
  229                     sc->sc_mem_res);
  230         if (sc->sc_pdev)
  231                 destroy_dev(sc->sc_pdev);
  232 
  233         return (0);
  234 }
  235 
  236 static void
  237 ti_pruss_intr(void *arg)
  238 {
  239         struct ti_pruss_irq_arg *iap;
  240         struct ti_pruss_softc *sc;
  241 
  242         iap = arg;
  243         sc = iap->sc;
  244         DPRINTF("interrupt %p", sc);
  245         KNOTE_UNLOCKED(&sc->sc_selinfo.si_note, iap->irq);
  246 }
  247 
  248 static int
  249 ti_pruss_open(struct cdev *cdev, int oflags, int devtype, struct thread *td)
  250 {
  251         device_t dev = cdev->si_drv1;
  252         struct ti_pruss_softc *sc = device_get_softc(dev);
  253 
  254         if (atomic_cmpset_32(&sc->sc_inuse, 0, 1) == 0)
  255                 return (EBUSY);
  256         else
  257                 return (0);
  258 }
  259 
  260 static int
  261 ti_pruss_close(struct cdev *cdev, int fflag, int devtype, struct thread *td)
  262 {
  263         device_t dev = cdev->si_drv1;
  264         struct ti_pruss_softc *sc = device_get_softc(dev);
  265 
  266         sc->sc_inuse = 0;
  267 
  268         return (0);
  269 }
  270 
  271 static int
  272 ti_pruss_mmap(struct cdev *cdev, vm_ooffset_t offset, vm_paddr_t *paddr,
  273     int nprot, vm_memattr_t *memattr)
  274 {
  275         device_t dev = cdev->si_drv1;
  276         struct ti_pruss_softc *sc = device_get_softc(dev);
  277 
  278         if (offset > rman_get_size(sc->sc_mem_res))
  279                 return (-1);
  280         *paddr = rman_get_start(sc->sc_mem_res) + offset;
  281 
  282         return (0);
  283 }
  284 
  285 static struct filterops ti_pruss_kq_read = {
  286         .f_isfd = 1,
  287         .f_detach = ti_pruss_kq_read_detach,
  288         .f_event = ti_pruss_kq_read_event,
  289 };
  290 
  291 static void
  292 ti_pruss_kq_read_detach(struct knote *kn)
  293 {
  294         struct ti_pruss_softc *sc = kn->kn_hook;
  295 
  296         knlist_remove(&sc->sc_selinfo.si_note, kn, 0);
  297 }
  298 
  299 static int
  300 ti_pruss_kq_read_event(struct knote *kn, long hint)
  301 {
  302         kn->kn_data = hint;
  303 
  304         return (hint);
  305 }
  306 
  307 static int
  308 ti_pruss_kqfilter(struct cdev *cdev, struct knote *kn)
  309 {
  310         device_t dev = cdev->si_drv1;
  311         struct ti_pruss_softc *sc = device_get_softc(dev);
  312 
  313         switch (kn->kn_filter) {
  314         case EVFILT_READ:
  315                 kn->kn_hook = sc;
  316                 kn->kn_fop = &ti_pruss_kq_read;
  317                 knlist_add(&sc->sc_selinfo.si_note, kn, 1);
  318                 break;
  319         default:
  320                 return (EINVAL);
  321         }
  322 
  323         return (0);
  324 }
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FreeBSD/Linux Kernel Cross Reference sys/arm/ti/ti_pruss.c

FreeBSD/Linux Kernel Cross Reference
sys/arm/ti/ti_pruss.c
