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


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FreeBSD/Linux Kernel Cross Reference
sys/arm/versatile/sp804.c

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    1 /*
    2  * Copyright (c) 2012 Oleksandr Tymoshenko <gonzo@freebsd.org>
    3  * Copyright (c) 2012 Damjan Marion <dmarion@freebsd.org>
    4  * All rights reserved.
    5  *
    6  * Redistribution and use in source and binary forms, with or without
    7  * modification, are permitted provided that the following conditions
    8  * are met:
    9  * 1. Redistributions of source code must retain the above copyright
   10  *    notice, this list of conditions and the following disclaimer.
   11  * 2. Redistributions in binary form must reproduce the above copyright
   12  *    notice, this list of conditions and the following disclaimer in the
   13  *    documentation and/or other materials provided with the distribution.
   14  *
   15  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
   16  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   17  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   18  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
   19  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
   20  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
   21  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
   22  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
   23  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
   24  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   25  * SUCH DAMAGE.
   26  */
   27 
   28 #include <sys/cdefs.h>
   29 __FBSDID("$FreeBSD: releng/10.0/sys/arm/versatile/sp804.c 247463 2013-02-28 13:46:03Z mav $");
   30 
   31 #include <sys/param.h>
   32 #include <sys/systm.h>
   33 #include <sys/bus.h>
   34 #include <sys/kernel.h>
   35 #include <sys/module.h>
   36 #include <sys/malloc.h>
   37 #include <sys/rman.h>
   38 #include <sys/timeet.h>
   39 #include <sys/timetc.h>
   40 #include <sys/watchdog.h>
   41 #include <machine/bus.h>
   42 #include <machine/cpu.h>
   43 #include <machine/frame.h>
   44 #include <machine/intr.h>
   45 
   46 #include <dev/fdt/fdt_common.h>
   47 #include <dev/ofw/openfirm.h>
   48 #include <dev/ofw/ofw_bus.h>
   49 #include <dev/ofw/ofw_bus_subr.h>
   50 
   51 #include <machine/bus.h>
   52 #include <machine/fdt.h>
   53 
   54 #define SP804_TIMER1_LOAD       0x00
   55 #define SP804_TIMER1_VALUE      0x04
   56 #define SP804_TIMER1_CONTROL    0x08
   57 #define         TIMER_CONTROL_EN        (1 << 7)
   58 #define         TIMER_CONTROL_FREERUN   (0 << 6)
   59 #define         TIMER_CONTROL_PERIODIC  (1 << 6)
   60 #define         TIMER_CONTROL_INTREN    (1 << 5)
   61 #define         TIMER_CONTROL_DIV1      (0 << 2)
   62 #define         TIMER_CONTROL_DIV16     (1 << 2)
   63 #define         TIMER_CONTROL_DIV256    (2 << 2)
   64 #define         TIMER_CONTROL_32BIT     (1 << 1)
   65 #define         TIMER_CONTROL_ONESHOT   (1 << 0)
   66 #define SP804_TIMER1_INTCLR     0x0C
   67 #define SP804_TIMER1_RIS        0x10
   68 #define SP804_TIMER1_MIS        0x14
   69 #define SP804_TIMER1_BGLOAD     0x18
   70 #define SP804_TIMER2_LOAD       0x20
   71 #define SP804_TIMER2_VALUE      0x24
   72 #define SP804_TIMER2_CONTROL    0x28
   73 #define SP804_TIMER2_INTCLR     0x2C
   74 #define SP804_TIMER2_RIS        0x30
   75 #define SP804_TIMER2_MIS        0x34
   76 #define SP804_TIMER2_BGLOAD     0x38
   77 
   78 #define SP804_PERIPH_ID0        0xFE0
   79 #define SP804_PERIPH_ID1        0xFE4
   80 #define SP804_PERIPH_ID2        0xFE8
   81 #define SP804_PERIPH_ID3        0xFEC
   82 #define SP804_PRIMECELL_ID0     0xFF0
   83 #define SP804_PRIMECELL_ID1     0xFF4
   84 #define SP804_PRIMECELL_ID2     0xFF8
   85 #define SP804_PRIMECELL_ID3     0xFFC
   86 
   87 #define DEFAULT_FREQUENCY       1000000
   88 /*
   89  * QEMU seems to have problem with full frequency
   90  */
   91 #define DEFAULT_DIVISOR         16
   92 #define DEFAULT_CONTROL_DIV     TIMER_CONTROL_DIV16
   93 
   94 struct sp804_timer_softc {
   95         struct resource*        mem_res;
   96         struct resource*        irq_res;
   97         void*                   intr_hl;
   98         uint32_t                sysclk_freq;
   99         bus_space_tag_t         bst;
  100         bus_space_handle_t      bsh;
  101         struct timecounter      tc;
  102         bool                    et_enabled;
  103         struct eventtimer       et;
  104 };
  105 
  106 /* Read/Write macros for Timer used as timecounter */
  107 #define sp804_timer_tc_read_4(reg)              \
  108         bus_space_read_4(sc->bst, sc->bsh, reg)
  109 
  110 #define sp804_timer_tc_write_4(reg, val)        \
  111         bus_space_write_4(sc->bst, sc->bsh, reg, val)
  112 
  113 static unsigned sp804_timer_tc_get_timecount(struct timecounter *);
  114 
  115 static unsigned
  116 sp804_timer_tc_get_timecount(struct timecounter *tc)
  117 {
  118         struct sp804_timer_softc *sc = tc->tc_priv;
  119         return 0xffffffff - sp804_timer_tc_read_4(SP804_TIMER1_VALUE);
  120 }
  121 
  122 static int
  123 sp804_timer_start(struct eventtimer *et, sbintime_t first, sbintime_t period)
  124 {
  125         struct sp804_timer_softc *sc = et->et_priv;
  126         uint32_t count, reg;
  127 
  128         if (first != 0) {
  129                 sc->et_enabled = 1;
  130 
  131                 count = ((uint32_t)et->et_frequency * first) >> 32;
  132 
  133                 sp804_timer_tc_write_4(SP804_TIMER2_LOAD, count);
  134                 reg = TIMER_CONTROL_32BIT | TIMER_CONTROL_INTREN |
  135                     TIMER_CONTROL_PERIODIC | DEFAULT_CONTROL_DIV |
  136                     TIMER_CONTROL_EN;
  137                 sp804_timer_tc_write_4(SP804_TIMER2_CONTROL, reg);
  138 
  139                 return (0);
  140         } 
  141 
  142         if (period != 0) {
  143                 panic("period");
  144         }
  145 
  146         return (EINVAL);
  147 }
  148 
  149 static int
  150 sp804_timer_stop(struct eventtimer *et)
  151 {
  152         struct sp804_timer_softc *sc = et->et_priv;
  153         uint32_t reg;
  154 
  155         sc->et_enabled = 0;
  156         reg = sp804_timer_tc_read_4(SP804_TIMER2_CONTROL);
  157         reg &= ~(TIMER_CONTROL_EN);
  158         sp804_timer_tc_write_4(SP804_TIMER2_CONTROL, reg);
  159 
  160         return (0);
  161 }
  162 
  163 static int
  164 sp804_timer_intr(void *arg)
  165 {
  166         struct sp804_timer_softc *sc = arg;
  167         static uint32_t prev = 0;
  168         uint32_t x = 0;
  169 
  170         x = sp804_timer_tc_read_4(SP804_TIMER1_VALUE);
  171 
  172         prev =x ;
  173         sp804_timer_tc_write_4(SP804_TIMER2_INTCLR, 1);
  174         if (sc->et_enabled) {
  175                 if (sc->et.et_active) {
  176                         sc->et.et_event_cb(&sc->et, sc->et.et_arg);
  177                 }
  178         }
  179 
  180         return (FILTER_HANDLED);
  181 }
  182 
  183 static int
  184 sp804_timer_probe(device_t dev)
  185 {
  186 
  187         if (ofw_bus_is_compatible(dev, "arm,sp804")) {
  188                 device_set_desc(dev, "SP804 System Timer");
  189                 return (BUS_PROBE_DEFAULT);
  190         }
  191 
  192         return (ENXIO);
  193 }
  194 
  195 static int
  196 sp804_timer_attach(device_t dev)
  197 {
  198         struct sp804_timer_softc *sc = device_get_softc(dev);
  199         int rid = 0;
  200         int i;
  201         uint32_t id, reg;
  202 
  203         sc->mem_res = bus_alloc_resource_any(dev, SYS_RES_MEMORY, &rid, RF_ACTIVE);
  204         if (sc->mem_res == NULL) {
  205                 device_printf(dev, "could not allocate memory resource\n");
  206                 return (ENXIO);
  207         }
  208 
  209         sc->bst = rman_get_bustag(sc->mem_res);
  210         sc->bsh = rman_get_bushandle(sc->mem_res);
  211 
  212         /* Request the IRQ resources */
  213         sc->irq_res =  bus_alloc_resource_any(dev, SYS_RES_IRQ, &rid, RF_ACTIVE);
  214         if (sc->irq_res == NULL) {
  215                 device_printf(dev, "Error: could not allocate irq resources\n");
  216                 return (ENXIO);
  217         }
  218 
  219         /* TODO: get frequency from FDT */
  220         sc->sysclk_freq = DEFAULT_FREQUENCY;
  221 
  222         /* Setup and enable the timer */
  223         if (bus_setup_intr(dev, sc->irq_res, INTR_TYPE_CLK,
  224                         sp804_timer_intr, NULL, sc,
  225                         &sc->intr_hl) != 0) {
  226                 bus_release_resource(dev, SYS_RES_IRQ, rid,
  227                         sc->irq_res);
  228                 device_printf(dev, "Unable to setup the clock irq handler.\n");
  229                 return (ENXIO);
  230         }
  231 
  232         sp804_timer_tc_write_4(SP804_TIMER1_CONTROL, 0);
  233         sp804_timer_tc_write_4(SP804_TIMER2_CONTROL, 0);
  234 
  235         /*
  236          * Timer 1, timecounter
  237          */
  238         sc->tc.tc_frequency = DEFAULT_FREQUENCY;
  239         sc->tc.tc_name = "SP804 Timecouter";
  240         sc->tc.tc_get_timecount = sp804_timer_tc_get_timecount;
  241         sc->tc.tc_poll_pps = NULL;
  242         sc->tc.tc_counter_mask = ~0u;
  243         sc->tc.tc_quality = 1000;
  244         sc->tc.tc_priv = sc;
  245 
  246         sp804_timer_tc_write_4(SP804_TIMER1_VALUE, 0xffffffff);
  247         sp804_timer_tc_write_4(SP804_TIMER1_LOAD, 0xffffffff);
  248         reg = TIMER_CONTROL_PERIODIC | TIMER_CONTROL_32BIT;
  249         sp804_timer_tc_write_4(SP804_TIMER1_CONTROL, reg);
  250         reg |= TIMER_CONTROL_EN;
  251         sp804_timer_tc_write_4(SP804_TIMER1_CONTROL, reg);
  252         tc_init(&sc->tc);
  253 
  254         /* 
  255          * Timer 2, event timer
  256          */
  257         sc->et_enabled = 0;
  258         sc->et.et_name = malloc(64, M_DEVBUF, M_NOWAIT | M_ZERO);
  259         sprintf(sc->et.et_name, "SP804 Event Timer %d",
  260                 device_get_unit(dev));
  261         sc->et.et_flags = ET_FLAGS_PERIODIC | ET_FLAGS_ONESHOT;
  262         sc->et.et_quality = 1000;
  263         sc->et.et_frequency = sc->sysclk_freq / DEFAULT_DIVISOR;
  264         sc->et.et_min_period = (0x00000002LLU << 32) / sc->et.et_frequency;
  265         sc->et.et_max_period = (0xfffffffeLLU << 32) / sc->et.et_frequency;
  266         sc->et.et_start = sp804_timer_start;
  267         sc->et.et_stop = sp804_timer_stop;
  268         sc->et.et_priv = sc;
  269         et_register(&sc->et);
  270 
  271         id = 0;
  272         for (i = 3; i >= 0; i--) {
  273                 id = (id << 8) | 
  274                      (sp804_timer_tc_read_4(SP804_PERIPH_ID0 + i*4) & 0xff);
  275         }
  276 
  277         device_printf(dev, "peripheral ID: %08x\n", id);
  278 
  279         id = 0;
  280         for (i = 3; i >= 0; i--) {
  281                 id = (id << 8) | 
  282                      (sp804_timer_tc_read_4(SP804_PRIMECELL_ID0 + i*4) & 0xff);
  283         }
  284 
  285         device_printf(dev, "PrimeCell ID: %08x\n", id);
  286 
  287         return (0);
  288 }
  289 
  290 static device_method_t sp804_timer_methods[] = {
  291         DEVMETHOD(device_probe,         sp804_timer_probe),
  292         DEVMETHOD(device_attach,        sp804_timer_attach),
  293         { 0, 0 }
  294 };
  295 
  296 static driver_t sp804_timer_driver = {
  297         "timer",
  298         sp804_timer_methods,
  299         sizeof(struct sp804_timer_softc),
  300 };
  301 
  302 static devclass_t sp804_timer_devclass;
  303 
  304 DRIVER_MODULE(sp804_timer, simplebus, sp804_timer_driver, sp804_timer_devclass, 0, 0);
  305 
  306 void
  307 DELAY(int usec)
  308 {
  309         int32_t counts;
  310         uint32_t first, last;
  311         device_t timer_dev;
  312         struct sp804_timer_softc *sc;
  313 
  314         timer_dev = devclass_get_device(sp804_timer_devclass, 0);
  315 
  316         if (timer_dev == NULL) {
  317                 /*
  318                  * Timer is not initialized yet
  319                  */
  320                 for (; usec > 0; usec--)
  321                         for (counts = 200; counts > 0; counts--)
  322                                 /* Prevent gcc from optimizing  out the loop */
  323                                 cpufunc_nullop();
  324                 return;
  325         }
  326 
  327         sc = device_get_softc(timer_dev);
  328 
  329         /* Get the number of times to count */
  330         counts = usec * ((sc->tc.tc_frequency / 1000000) + 1);
  331 
  332         first = sp804_timer_tc_get_timecount(&sc->tc);
  333 
  334         while (counts > 0) {
  335                 last = sp804_timer_tc_get_timecount(&sc->tc);
  336                 if (last == first)
  337                         continue;
  338                 if (last>first) {
  339                         counts -= (int32_t)(last - first);
  340                 } else {
  341                         counts -= (int32_t)((0xFFFFFFFF - first) + last);
  342                 }
  343                 first = last;
  344         }
  345 }

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