FreeBSD/Linux Kernel Cross Reference
sys/arm/mv/timer.c

     /*-
      * Copyright (c) 2006 Benno Rice.
      * Copyright (C) 2007-2008 MARVELL INTERNATIONAL LTD.
      * All rights reserved.
      *
      * Adapted to Marvell SoC by Semihalf.
      *
      * Redistribution and use in source and binary forms, with or without
      * modification, are permitted provided that the following conditions
     * are met:
     * 1. Redistributions of source code must retain the above copyright
     *    notice, this list of conditions and the following disclaimer.
     * 2. Redistributions in binary form must reproduce the above copyright
     *    notice, this list of conditions and the following disclaimer in the
     *    documentation and/or other materials provided with the distribution.
     *
     * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
     * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
     * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
     * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
     * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
     * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
     * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
     * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
     * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
     * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
     *
     * from: FreeBSD: //depot/projects/arm/src/sys/arm/xscale/pxa2x0/pxa2x0_timer.c, rev 1
     */
    
    #include <sys/cdefs.h>
    __FBSDID("$FreeBSD: releng/10.0/sys/arm/mv/timer.c 251371 2013-06-04 09:33:03Z gber $");
    
    #include <sys/param.h>
    #include <sys/systm.h>
    #include <sys/bus.h>
    #include <sys/kernel.h>
    #include <sys/module.h>
    #include <sys/malloc.h>
    #include <sys/rman.h>
    #include <sys/timeet.h>
    #include <sys/timetc.h>
    #include <sys/watchdog.h>
    #include <machine/bus.h>
    #include <machine/cpu.h>
    #include <machine/frame.h>
    #include <machine/intr.h>
    
    #include <arm/mv/mvreg.h>
    #include <arm/mv/mvvar.h>
    
    #include <dev/ofw/ofw_bus.h>
    #include <dev/ofw/ofw_bus_subr.h>
    
    #define INITIAL_TIMECOUNTER     (0xffffffff)
    #define MAX_WATCHDOG_TICKS      (0xffffffff)
    
    #if defined(SOC_MV_ARMADAXP)
    #define MV_CLOCK_SRC            25000000        /* Timers' 25MHz mode */
    #else
    #define MV_CLOCK_SRC            get_tclk()
    #endif
    
    struct mv_timer_softc {
            struct resource *       timer_res[2];
            bus_space_tag_t         timer_bst;
            bus_space_handle_t      timer_bsh;
            struct mtx              timer_mtx;
            struct eventtimer       et;
    };
    
    static struct resource_spec mv_timer_spec[] = {
            { SYS_RES_MEMORY,       0,      RF_ACTIVE },
            { SYS_RES_IRQ,          0,      RF_ACTIVE },
            { -1, 0 }
    };
    
    static struct mv_timer_softc *timer_softc = NULL;
    static int timers_initialized = 0;
    
    static int      mv_timer_probe(device_t);
    static int      mv_timer_attach(device_t);
    
    static int      mv_hardclock(void *);
    static unsigned mv_timer_get_timecount(struct timecounter *);
    
    static uint32_t mv_get_timer_control(void);
    static void     mv_set_timer_control(uint32_t);
    static uint32_t mv_get_timer(uint32_t);
    static void     mv_set_timer(uint32_t, uint32_t);
    static void     mv_set_timer_rel(uint32_t, uint32_t);
    static void     mv_watchdog_enable(void);
    static void     mv_watchdog_disable(void);
    static void     mv_watchdog_event(void *, unsigned int, int *);
    static int      mv_timer_start(struct eventtimer *et,
        sbintime_t first, sbintime_t period);
    static int      mv_timer_stop(struct eventtimer *et);
    static void     mv_setup_timers(void);
    
   static struct timecounter mv_timer_timecounter = {
           .tc_get_timecount = mv_timer_get_timecount,
           .tc_name = "CPUTimer1",
           .tc_frequency = 0,      /* This is assigned on the fly in the init sequence */
           .tc_counter_mask = ~0u,
           .tc_quality = 1000,
   };
   
   static int
   mv_timer_probe(device_t dev)
   {
   
           if (!ofw_bus_is_compatible(dev, "mrvl,timer"))
                   return (ENXIO);
   
           device_set_desc(dev, "Marvell CPU Timer");
           return (0);
   }
   
   static int
   mv_timer_attach(device_t dev)
   {
           int     error;
           void    *ihl;
           struct  mv_timer_softc *sc;
   #if !defined(SOC_MV_ARMADAXP)
           uint32_t irq_cause, irq_mask;
   #endif
   
           if (timer_softc != NULL)
                   return (ENXIO);
   
           sc = (struct mv_timer_softc *)device_get_softc(dev);
           timer_softc = sc;
   
           error = bus_alloc_resources(dev, mv_timer_spec, sc->timer_res);
           if (error) {
                   device_printf(dev, "could not allocate resources\n");
                   return (ENXIO);
           }
   
           sc->timer_bst = rman_get_bustag(sc->timer_res[0]);
           sc->timer_bsh = rman_get_bushandle(sc->timer_res[0]);
   
           mtx_init(&timer_softc->timer_mtx, "watchdog", NULL, MTX_DEF);
           mv_watchdog_disable();
           EVENTHANDLER_REGISTER(watchdog_list, mv_watchdog_event, sc, 0);
   
           if (bus_setup_intr(dev, sc->timer_res[1], INTR_TYPE_CLK,
               mv_hardclock, NULL, sc, &ihl) != 0) {
                   bus_release_resources(dev, mv_timer_spec, sc->timer_res);
                   device_printf(dev, "Could not setup interrupt.\n");
                   return (ENXIO);
           }
   
           mv_setup_timers();
   #if !defined(SOC_MV_ARMADAXP)
           irq_cause = read_cpu_ctrl(BRIDGE_IRQ_CAUSE);
           irq_cause &= IRQ_TIMER0_CLR;
   
           write_cpu_ctrl(BRIDGE_IRQ_CAUSE, irq_cause);
           irq_mask = read_cpu_ctrl(BRIDGE_IRQ_MASK);
           irq_mask |= IRQ_TIMER0_MASK;
           irq_mask &= ~IRQ_TIMER1_MASK;
           write_cpu_ctrl(BRIDGE_IRQ_MASK, irq_mask);
   #endif
           sc->et.et_name = "CPUTimer0";
           sc->et.et_flags = ET_FLAGS_PERIODIC | ET_FLAGS_ONESHOT;
           sc->et.et_quality = 1000;
   
           sc->et.et_frequency = MV_CLOCK_SRC;
           sc->et.et_min_period = (0x00000002LLU << 32) / sc->et.et_frequency;
           sc->et.et_max_period = (0xfffffffeLLU << 32) / sc->et.et_frequency;
           sc->et.et_start = mv_timer_start;
           sc->et.et_stop = mv_timer_stop;
           sc->et.et_priv = sc;
           et_register(&sc->et);
           mv_timer_timecounter.tc_frequency = MV_CLOCK_SRC;
           tc_init(&mv_timer_timecounter);
   
           return (0);
   }
   
   static int
   mv_hardclock(void *arg)
   {
           struct  mv_timer_softc *sc;
           uint32_t irq_cause;
   
           irq_cause = read_cpu_ctrl(BRIDGE_IRQ_CAUSE);
           irq_cause &= IRQ_TIMER0_CLR;
           write_cpu_ctrl(BRIDGE_IRQ_CAUSE, irq_cause);
   
           sc = (struct mv_timer_softc *)arg;
           if (sc->et.et_active)
                   sc->et.et_event_cb(&sc->et, sc->et.et_arg);
   
           return (FILTER_HANDLED);
   }
   
   static device_method_t mv_timer_methods[] = {
           DEVMETHOD(device_probe, mv_timer_probe),
           DEVMETHOD(device_attach, mv_timer_attach),
   
           { 0, 0 }
   };
   
   static driver_t mv_timer_driver = {
           "timer",
           mv_timer_methods,
           sizeof(struct mv_timer_softc),
   };
   
   static devclass_t mv_timer_devclass;
   
   DRIVER_MODULE(timer, simplebus, mv_timer_driver, mv_timer_devclass, 0, 0);
   
   static unsigned
   mv_timer_get_timecount(struct timecounter *tc)
   {
   
           return (INITIAL_TIMECOUNTER - mv_get_timer(1));
   }
   
   void
   cpu_initclocks(void)
   {
   
           cpu_initclocks_bsp();
   }
   
   void
   DELAY(int usec)
   {
           uint32_t        val, val_temp;
           int32_t         nticks;
   
           if (!timers_initialized) {
                   for (; usec > 0; usec--)
                           for (val = 100; val > 0; val--)
                                   __asm __volatile("nop" ::: "memory");
                   return;
           }
   
           val = mv_get_timer(1);
           nticks = ((MV_CLOCK_SRC / 1000000 + 1) * usec);
   
           while (nticks > 0) {
                   val_temp = mv_get_timer(1);
                   if (val > val_temp)
                           nticks -= (val - val_temp);
                   else
                           nticks -= (val + (INITIAL_TIMECOUNTER - val_temp));
   
                   val = val_temp;
           }
   }
   
   static uint32_t
   mv_get_timer_control(void)
   {
   
           return (bus_space_read_4(timer_softc->timer_bst,
               timer_softc->timer_bsh, CPU_TIMER_CONTROL));
   }
   
   static void
   mv_set_timer_control(uint32_t val)
   {
   
           bus_space_write_4(timer_softc->timer_bst,
               timer_softc->timer_bsh, CPU_TIMER_CONTROL, val);
   }
   
   static uint32_t
   mv_get_timer(uint32_t timer)
   {
   
           return (bus_space_read_4(timer_softc->timer_bst,
               timer_softc->timer_bsh, CPU_TIMER0 + timer * 0x8));
   }
   
   static void
   mv_set_timer(uint32_t timer, uint32_t val)
   {
   
           bus_space_write_4(timer_softc->timer_bst,
               timer_softc->timer_bsh, CPU_TIMER0 + timer * 0x8, val);
   }
   
   static void
   mv_set_timer_rel(uint32_t timer, uint32_t val)
   {
   
           bus_space_write_4(timer_softc->timer_bst,
               timer_softc->timer_bsh, CPU_TIMER0_REL + timer * 0x8, val);
   }
   
   static void
   mv_watchdog_enable(void)
   {
           uint32_t val, irq_cause;
   #if !defined(SOC_MV_ARMADAXP)
           uint32_t irq_mask;
   #endif
   
           irq_cause = read_cpu_ctrl(BRIDGE_IRQ_CAUSE);
           irq_cause &= IRQ_TIMER_WD_CLR;
           write_cpu_ctrl(BRIDGE_IRQ_CAUSE, irq_cause);
   
   #if defined(SOC_MV_ARMADAXP)
           val = read_cpu_mp_clocks(WD_RSTOUTn_MASK);
           val |= (WD_GLOBAL_MASK | WD_CPU0_MASK);
           write_cpu_mp_clocks(WD_RSTOUTn_MASK, val);
   #else
           irq_mask = read_cpu_ctrl(BRIDGE_IRQ_MASK);
           irq_mask |= IRQ_TIMER_WD_MASK;
           write_cpu_ctrl(BRIDGE_IRQ_MASK, irq_mask);
   
           val = read_cpu_ctrl(RSTOUTn_MASK);
           val |= WD_RST_OUT_EN;
           write_cpu_ctrl(RSTOUTn_MASK, val);
   #endif
   
           val = mv_get_timer_control();
           val |= CPU_TIMER_WD_EN | CPU_TIMER_WD_AUTO;
   #if defined(SOC_MV_ARMADAXP)
           val |= CPU_TIMER_WD_25MHZ_EN;
   #endif
           mv_set_timer_control(val);
   }
   
   static void
   mv_watchdog_disable(void)
   {
           uint32_t val, irq_cause;
   #if !defined(SOC_MV_ARMADAXP)
           uint32_t irq_mask;
   #endif
   
           val = mv_get_timer_control();
           val &= ~(CPU_TIMER_WD_EN | CPU_TIMER_WD_AUTO);
           mv_set_timer_control(val);
   
   #if defined(SOC_MV_ARMADAXP)
           val = read_cpu_mp_clocks(WD_RSTOUTn_MASK);
           val &= ~(WD_GLOBAL_MASK | WD_CPU0_MASK);
           write_cpu_mp_clocks(WD_RSTOUTn_MASK, val);
   #else
           val = read_cpu_ctrl(RSTOUTn_MASK);
           val &= ~WD_RST_OUT_EN;
           write_cpu_ctrl(RSTOUTn_MASK, val);
   
           irq_mask = read_cpu_ctrl(BRIDGE_IRQ_MASK);
           irq_mask &= ~(IRQ_TIMER_WD_MASK);
           write_cpu_ctrl(BRIDGE_IRQ_MASK, irq_mask);
   #endif
   
           irq_cause = read_cpu_ctrl(BRIDGE_IRQ_CAUSE);
           irq_cause &= IRQ_TIMER_WD_CLR;
           write_cpu_ctrl(BRIDGE_IRQ_CAUSE, irq_cause);
   }
   
   
   /*
    * Watchdog event handler.
    */
   static void
   mv_watchdog_event(void *arg, unsigned int cmd, int *error)
   {
           uint64_t ns;
           uint64_t ticks;
   
           mtx_lock(&timer_softc->timer_mtx);
           if (cmd == 0)
                   mv_watchdog_disable();
           else {
                   /*
                    * Watchdog timeout is in nanosecs, calculation according to
                    * watchdog(9)
                    */
                   ns = (uint64_t)1 << (cmd & WD_INTERVAL);
                   ticks = (uint64_t)(ns * MV_CLOCK_SRC) / 1000000000;
                   if (ticks > MAX_WATCHDOG_TICKS)
                           mv_watchdog_disable();
                   else {
                           /* Timer 2 is the watchdog */
                           mv_set_timer(2, ticks);
                           mv_watchdog_enable();
                           *error = 0;
                   }
           }
           mtx_unlock(&timer_softc->timer_mtx);
   }
   
   static int
   mv_timer_start(struct eventtimer *et, sbintime_t first, sbintime_t period)
   {
           struct  mv_timer_softc *sc;
           uint32_t val, val1;
   
           /* Calculate dividers. */
           sc = (struct mv_timer_softc *)et->et_priv;
           if (period != 0)
                   val = ((uint32_t)sc->et.et_frequency * period) >> 32;
           else
                   val = 0;
           if (first != 0)
                   val1 = ((uint32_t)sc->et.et_frequency * first) >> 32;
           else
                   val1 = val;
   
           /* Apply configuration. */
           mv_set_timer_rel(0, val);
           mv_set_timer(0, val1);
           val = mv_get_timer_control();
           val |= CPU_TIMER0_EN;
           if (period != 0)
                   val |= CPU_TIMER0_AUTO;
           else
                   val &= ~CPU_TIMER0_AUTO;
           mv_set_timer_control(val);
           return (0);
   }
   
   static int
   mv_timer_stop(struct eventtimer *et)
   {
           uint32_t val;
   
           val = mv_get_timer_control();
           val &= ~(CPU_TIMER0_EN | CPU_TIMER0_AUTO);
           mv_set_timer_control(val);
           return (0);
   }
   
   static void
   mv_setup_timers(void)
   {
           uint32_t val;
   
           mv_set_timer_rel(1, INITIAL_TIMECOUNTER);
           mv_set_timer(1, INITIAL_TIMECOUNTER);
           val = mv_get_timer_control();
           val &= ~(CPU_TIMER0_EN | CPU_TIMER0_AUTO);
           val |= CPU_TIMER1_EN | CPU_TIMER1_AUTO;
   #if defined(SOC_MV_ARMADAXP)
           /* Enable 25MHz mode */
           val |= CPU_TIMER0_25MHZ_EN | CPU_TIMER1_25MHZ_EN;
   #endif
           mv_set_timer_control(val);
           timers_initialized = 1;
   }

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