The Design and Implementation of the FreeBSD Operating System, Second Edition
Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)


[ source navigation ] [ diff markup ] [ identifier search ] [ freetext search ] [ file search ] [ list types ] [ track identifier ]

FreeBSD/Linux Kernel Cross Reference
sys/arm/xscale/pxa/pxa_timer.c

Version: -  FREEBSD  -  FREEBSD-12-STABLE  -  FREEBSD-12-0  -  FREEBSD-11-STABLE  -  FREEBSD-11-2  -  FREEBSD-11-1  -  FREEBSD-11-0  -  FREEBSD-10-STABLE  -  FREEBSD-10-4  -  FREEBSD-10-3  -  FREEBSD-10-2  -  FREEBSD-10-1  -  FREEBSD-10-0  -  FREEBSD-9-STABLE  -  FREEBSD-9-3  -  FREEBSD-9-2  -  FREEBSD-9-1  -  FREEBSD-9-0  -  FREEBSD-8-STABLE  -  FREEBSD-8-4  -  FREEBSD-8-3  -  FREEBSD-8-2  -  FREEBSD-8-1  -  FREEBSD-8-0  -  FREEBSD-7-STABLE  -  FREEBSD-7-4  -  FREEBSD-7-3  -  FREEBSD-7-2  -  FREEBSD-7-1  -  FREEBSD-7-0  -  FREEBSD-6-STABLE  -  FREEBSD-6-4  -  FREEBSD-6-3  -  FREEBSD-6-2  -  FREEBSD-6-1  -  FREEBSD-6-0  -  FREEBSD-5-STABLE  -  FREEBSD-5-5  -  FREEBSD-5-4  -  FREEBSD-5-3  -  FREEBSD-5-2  -  FREEBSD-5-1  -  FREEBSD-5-0  -  FREEBSD-4-STABLE  -  FREEBSD-3-STABLE  -  FREEBSD22  -  linux-2.6  -  linux-2.4.22  -  MK83  -  MK84  -  PLAN9  -  DFBSD  -  NETBSD  -  NETBSD5  -  NETBSD4  -  NETBSD3  -  NETBSD20  -  OPENBSD  -  xnu-517  -  xnu-792  -  xnu-792.6.70  -  xnu-1228  -  xnu-1456.1.26  -  xnu-1699.24.8  -  xnu-2050.18.24  -  OPENSOLARIS  -  minix-3-1-1 
SearchContext: -  none  -  3  -  10 

    1 /*-
    2  * Copyright (c) 2006 Benno Rice.  All rights reserved.
    3  *
    4  * Redistribution and use in source and binary forms, with or without
    5  * modification, are permitted provided that the following conditions
    6  * are met:
    7  * 1. Redistributions of source code must retain the above copyright
    8  *    notice, this list of conditions and the following disclaimer.
    9  * 2. Redistributions in binary form must reproduce the above copyright
   10  *    notice, this list of conditions and the following disclaimer in the
   11  *    documentation and/or other materials provided with the distribution.
   12  *
   13  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
   14  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
   15  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
   16  * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
   17  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
   18  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
   19  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
   20  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
   21  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
   22  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
   23  */
   24 
   25 #include <sys/cdefs.h>
   26 __FBSDID("$FreeBSD: releng/9.0/sys/arm/xscale/pxa/pxa_timer.c 179595 2008-06-06 05:08:09Z benno $");
   27 
   28 #include <sys/param.h>
   29 #include <sys/systm.h>
   30 #include <sys/bus.h>
   31 #include <sys/kernel.h>
   32 #include <sys/module.h>
   33 #include <sys/malloc.h>
   34 #include <sys/rman.h>
   35 #include <sys/timetc.h>
   36 #include <machine/bus.h>
   37 #include <machine/cpu.h>
   38 #include <machine/frame.h>
   39 #include <machine/intr.h>
   40 
   41 #include <arm/xscale/pxa/pxavar.h>
   42 #include <arm/xscale/pxa/pxareg.h>
   43 
   44 #define PXA_TIMER_FREQUENCY     3686400
   45 #define PXA_TIMER_TICK          (PXA_TIMER_FREQUENCY / hz)
   46 
   47 struct pxa_timer_softc {
   48         struct resource *       pt_res[5];
   49         bus_space_tag_t         pt_bst;
   50         bus_space_handle_t      pt_bsh;
   51 };
   52 
   53 static struct resource_spec pxa_timer_spec[] = {
   54         { SYS_RES_MEMORY,       0,      RF_ACTIVE },
   55         { SYS_RES_IRQ,          0,      RF_ACTIVE },
   56         { SYS_RES_IRQ,          1,      RF_ACTIVE },
   57         { SYS_RES_IRQ,          2,      RF_ACTIVE },
   58         { SYS_RES_IRQ,          3,      RF_ACTIVE },
   59         { -1, 0 }
   60 };
   61 
   62 static struct pxa_timer_softc *timer_softc = NULL;
   63 
   64 static int      pxa_timer_probe(device_t);
   65 static int      pxa_timer_attach(device_t);
   66 
   67 static driver_filter_t  pxa_hardclock;
   68 
   69 static unsigned pxa_timer_get_timecount(struct timecounter *);
   70 
   71 uint32_t        pxa_timer_get_osmr(int);
   72 void            pxa_timer_set_osmr(int, uint32_t);
   73 uint32_t        pxa_timer_get_oscr(void);
   74 void            pxa_timer_set_oscr(uint32_t);
   75 uint32_t        pxa_timer_get_ossr(void);
   76 void            pxa_timer_clear_ossr(uint32_t);
   77 void            pxa_timer_watchdog_enable(void);
   78 void            pxa_timer_watchdog_disable(void);
   79 void            pxa_timer_interrupt_enable(int);
   80 void            pxa_timer_interrupt_disable(int);
   81 
   82 static struct timecounter pxa_timer_timecounter = {
   83         .tc_get_timecount = pxa_timer_get_timecount,
   84         .tc_name = "OS Timer",
   85         .tc_frequency = PXA_TIMER_FREQUENCY,
   86         .tc_counter_mask = ~0u,
   87         .tc_quality = 1000,
   88 };
   89 
   90 static int
   91 pxa_timer_probe(device_t dev)
   92 {
   93 
   94         device_set_desc(dev, "OS Timer");
   95         return (0);
   96 }
   97 
   98 static int
   99 pxa_timer_attach(device_t dev)
  100 {
  101         int     error;
  102         void    *ihl;
  103         struct  pxa_timer_softc *sc;
  104 
  105         sc = (struct pxa_timer_softc *)device_get_softc(dev);
  106 
  107         if (timer_softc != NULL)
  108                 return (ENXIO);
  109 
  110         error = bus_alloc_resources(dev, pxa_timer_spec, sc->pt_res);
  111         if (error) {
  112                 device_printf(dev, "could not allocate resources\n");
  113                 return (ENXIO);
  114         }
  115 
  116         sc->pt_bst = rman_get_bustag(sc->pt_res[0]);
  117         sc->pt_bsh = rman_get_bushandle(sc->pt_res[0]);
  118 
  119         timer_softc = sc;
  120 
  121         pxa_timer_interrupt_disable(-1);
  122         pxa_timer_watchdog_disable();
  123 
  124         if (bus_setup_intr(dev, sc->pt_res[1], INTR_TYPE_CLK,
  125             pxa_hardclock, NULL, NULL, &ihl) != 0) {
  126                 bus_release_resources(dev, pxa_timer_spec, sc->pt_res);
  127                 device_printf(dev, "could not setup hardclock interrupt\n");
  128                 return (ENXIO);
  129         }
  130 
  131         return (0);
  132 }
  133 
  134 static int
  135 pxa_hardclock(void *arg)
  136 {
  137         struct          trapframe *frame;
  138 
  139         frame = (struct trapframe *)arg;
  140 
  141         /* Clear the interrupt */
  142         pxa_timer_clear_ossr(OST_SR_CH0);
  143 
  144         /* Schedule next tick */
  145         pxa_timer_set_osmr(0, pxa_timer_get_oscr() + PXA_TIMER_TICK);
  146 
  147         /* Do what we came here for */
  148         hardclock(TRAPF_USERMODE(frame), TRAPF_PC(frame));
  149         
  150         return (FILTER_HANDLED);
  151 }
  152 
  153 static device_method_t pxa_timer_methods[] = {
  154         DEVMETHOD(device_probe, pxa_timer_probe),
  155         DEVMETHOD(device_attach, pxa_timer_attach),
  156 
  157         {0, 0}
  158 };
  159 
  160 static driver_t pxa_timer_driver = {
  161         "timer",
  162         pxa_timer_methods,
  163         sizeof(struct pxa_timer_softc),
  164 };
  165 
  166 static devclass_t pxa_timer_devclass;
  167 
  168 DRIVER_MODULE(pxatimer, pxa, pxa_timer_driver, pxa_timer_devclass, 0, 0);
  169 
  170 static unsigned
  171 pxa_timer_get_timecount(struct timecounter *tc)
  172 {
  173 
  174         return (pxa_timer_get_oscr());
  175 }
  176 
  177 void
  178 cpu_initclocks(void)
  179 {
  180 
  181         pxa_timer_set_oscr(0);
  182         pxa_timer_set_osmr(0, PXA_TIMER_TICK);
  183         pxa_timer_interrupt_enable(0);
  184 
  185         tc_init(&pxa_timer_timecounter);
  186 }
  187 
  188 void
  189 cpu_reset(void)
  190 {
  191         uint32_t        val;
  192 
  193         (void)disable_interrupts(I32_bit|F32_bit);
  194 
  195         val = pxa_timer_get_oscr();
  196         val += PXA_TIMER_FREQUENCY;
  197         pxa_timer_set_osmr(3, val);
  198         pxa_timer_watchdog_enable();
  199 
  200         for(;;);
  201 }
  202 
  203 void
  204 DELAY(int usec)
  205 {
  206         uint32_t        val;
  207 
  208         if (timer_softc == NULL) {
  209                 for (; usec > 0; usec--)
  210                         for (val = 100; val > 0; val--)
  211                                 ;
  212                 return;
  213         }
  214 
  215         val = pxa_timer_get_oscr();
  216         val += (PXA_TIMER_FREQUENCY * usec) / 1000000;
  217         while (pxa_timer_get_oscr() <= val);
  218 }
  219 
  220 uint32_t
  221 pxa_timer_get_osmr(int which)
  222 {
  223 
  224         return (bus_space_read_4(timer_softc->pt_bst,
  225             timer_softc->pt_bsh, which * 0x4));
  226 }
  227 
  228 void
  229 pxa_timer_set_osmr(int which, uint32_t val)
  230 {
  231 
  232         bus_space_write_4(timer_softc->pt_bst,
  233             timer_softc->pt_bsh, which * 0x4, val);
  234 }
  235 
  236 uint32_t
  237 pxa_timer_get_oscr()
  238 {
  239 
  240         return (bus_space_read_4(timer_softc->pt_bst,
  241             timer_softc->pt_bsh, OST_CR));
  242 }
  243 
  244 void
  245 pxa_timer_set_oscr(uint32_t val)
  246 {
  247 
  248         bus_space_write_4(timer_softc->pt_bst,
  249             timer_softc->pt_bsh, OST_CR, val);
  250 }
  251 
  252 uint32_t
  253 pxa_timer_get_ossr()
  254 {
  255 
  256         return (bus_space_read_4(timer_softc->pt_bst,
  257             timer_softc->pt_bsh, OST_SR));
  258 }
  259 
  260 void
  261 pxa_timer_clear_ossr(uint32_t val)
  262 {
  263 
  264         bus_space_write_4(timer_softc->pt_bst,
  265             timer_softc->pt_bsh, OST_SR, val);
  266 }
  267 
  268 void
  269 pxa_timer_watchdog_enable()
  270 {
  271 
  272         bus_space_write_4(timer_softc->pt_bst,
  273             timer_softc->pt_bsh, OST_WR, 0x1);
  274 }
  275 
  276 void
  277 pxa_timer_watchdog_disable()    
  278 {
  279 
  280         bus_space_write_4(timer_softc->pt_bst,
  281             timer_softc->pt_bsh, OST_WR, 0x0);
  282 }
  283 
  284 void
  285 pxa_timer_interrupt_enable(int which)
  286 {
  287         uint32_t        oier;
  288 
  289         if (which == -1) {
  290                 bus_space_write_4(timer_softc->pt_bst,
  291                     timer_softc->pt_bsh, OST_IR, 0xf);
  292                 return;
  293         }
  294 
  295         oier = bus_space_read_4(timer_softc->pt_bst,
  296             timer_softc->pt_bsh, OST_IR);
  297         oier |= 1 << which;
  298         bus_space_write_4(timer_softc->pt_bst,
  299             timer_softc->pt_bsh, OST_IR, oier);
  300 }
  301 
  302 void
  303 pxa_timer_interrupt_disable(int which)
  304 {
  305         uint32_t        oier;
  306 
  307         if (which == -1) {
  308                 bus_space_write_4(timer_softc->pt_bst,
  309                     timer_softc->pt_bsh, OST_IR, 0);
  310         }
  311 
  312         oier = bus_space_read_4(timer_softc->pt_bst,
  313             timer_softc->pt_bsh, OST_IR);
  314         oier &= ~(1 << which);
  315         bus_space_write_4(timer_softc->pt_bst,
  316             timer_softc->pt_bsh, OST_IR, oier);
  317 }

Cache object: 513833b239fbef0acf6bfdd9f188e75d


[ 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.