1239278Sgonzo/*- 2239278Sgonzo * Copyright (c) 2011 Jakub Wojciech Klama <jceel@FreeBSD.org> 3239278Sgonzo * All rights reserved. 4239278Sgonzo * 5239278Sgonzo * Redistribution and use in source and binary forms, with or without 6239278Sgonzo * modification, are permitted provided that the following conditions 7239278Sgonzo * are met: 8239278Sgonzo * 1. Redistributions of source code must retain the above copyright 9239278Sgonzo * notice, this list of conditions and the following disclaimer. 10239278Sgonzo * 2. Redistributions in binary form must reproduce the above copyright 11239278Sgonzo * notice, this list of conditions and the following disclaimer in the 12239278Sgonzo * documentation and/or other materials provided with the distribution. 13239278Sgonzo * 14239278Sgonzo * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 15239278Sgonzo * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 16239278Sgonzo * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 17239278Sgonzo * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 18239278Sgonzo * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 19239278Sgonzo * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 20239278Sgonzo * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 21239278Sgonzo * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 22239278Sgonzo * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 23239278Sgonzo * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 24239278Sgonzo * SUCH DAMAGE. 25239278Sgonzo * 26239278Sgonzo */ 27239278Sgonzo#include <sys/cdefs.h> 28239278Sgonzo__FBSDID("$FreeBSD: stable/11/sys/arm/lpc/lpc_timer.c 314503 2017-03-01 18:53:05Z ian $"); 29239278Sgonzo 30239278Sgonzo#include <sys/param.h> 31239278Sgonzo#include <sys/systm.h> 32239278Sgonzo#include <sys/bus.h> 33239278Sgonzo#include <sys/kernel.h> 34239278Sgonzo#include <sys/module.h> 35239278Sgonzo#include <sys/malloc.h> 36239278Sgonzo#include <sys/rman.h> 37239278Sgonzo#include <sys/timetc.h> 38239278Sgonzo#include <sys/timeet.h> 39239278Sgonzo#include <machine/bus.h> 40239278Sgonzo#include <machine/cpu.h> 41239278Sgonzo#include <machine/intr.h> 42239278Sgonzo 43239278Sgonzo#include <dev/ofw/ofw_bus.h> 44239278Sgonzo#include <dev/ofw/ofw_bus_subr.h> 45239278Sgonzo 46239278Sgonzo#include <arm/lpc/lpcreg.h> 47239278Sgonzo#include <arm/lpc/lpcvar.h> 48239278Sgonzo 49239278Sgonzostruct lpc_timer_softc { 50239278Sgonzo device_t lt_dev; 51239278Sgonzo struct eventtimer lt_et; 52239278Sgonzo struct resource * lt_res[5]; 53239278Sgonzo bus_space_tag_t lt_bst0; 54239278Sgonzo bus_space_handle_t lt_bsh0; 55239278Sgonzo bus_space_tag_t lt_bst1; 56239278Sgonzo bus_space_handle_t lt_bsh1; 57239278Sgonzo int lt_oneshot; 58239278Sgonzo uint32_t lt_period; 59239278Sgonzo}; 60239278Sgonzo 61239278Sgonzostatic struct resource_spec lpc_timer_spec[] = { 62239278Sgonzo { SYS_RES_MEMORY, 0, RF_ACTIVE }, 63239278Sgonzo { SYS_RES_MEMORY, 1, RF_ACTIVE }, 64239278Sgonzo { SYS_RES_IRQ, 0, RF_ACTIVE }, 65239278Sgonzo { SYS_RES_IRQ, 1, RF_ACTIVE }, 66239278Sgonzo { -1, 0 } 67239278Sgonzo}; 68239278Sgonzo 69239278Sgonzostatic struct lpc_timer_softc *timer_softc = NULL; 70239278Sgonzostatic int lpc_timer_initialized = 0; 71239278Sgonzostatic int lpc_timer_probe(device_t); 72239278Sgonzostatic int lpc_timer_attach(device_t); 73247463Smavstatic int lpc_timer_start(struct eventtimer *, 74247463Smav sbintime_t first, sbintime_t period); 75239278Sgonzostatic int lpc_timer_stop(struct eventtimer *et); 76239278Sgonzostatic unsigned lpc_get_timecount(struct timecounter *); 77239278Sgonzostatic int lpc_hardclock(void *); 78239278Sgonzo 79239278Sgonzo#define timer0_read_4(sc, reg) \ 80239278Sgonzo bus_space_read_4(sc->lt_bst0, sc->lt_bsh0, reg) 81239278Sgonzo#define timer0_write_4(sc, reg, val) \ 82239278Sgonzo bus_space_write_4(sc->lt_bst0, sc->lt_bsh0, reg, val) 83239278Sgonzo#define timer0_clear(sc) \ 84239278Sgonzo do { \ 85239278Sgonzo timer0_write_4(sc, LPC_TIMER_TC, 0); \ 86239278Sgonzo timer0_write_4(sc, LPC_TIMER_PR, 0); \ 87239278Sgonzo timer0_write_4(sc, LPC_TIMER_PC, 0); \ 88239278Sgonzo } while(0) 89239278Sgonzo 90239278Sgonzo#define timer1_read_4(sc, reg) \ 91239278Sgonzo bus_space_read_4(sc->lt_bst1, sc->lt_bsh1, reg) 92239278Sgonzo#define timer1_write_4(sc, reg, val) \ 93239278Sgonzo bus_space_write_4(sc->lt_bst1, sc->lt_bsh1, reg, val) 94239278Sgonzo#define timer1_clear(sc) \ 95239278Sgonzo do { \ 96239278Sgonzo timer1_write_4(sc, LPC_TIMER_TC, 0); \ 97239278Sgonzo timer1_write_4(sc, LPC_TIMER_PR, 0); \ 98239278Sgonzo timer1_write_4(sc, LPC_TIMER_PC, 0); \ 99239278Sgonzo } while(0) 100239278Sgonzo 101239278Sgonzostatic struct timecounter lpc_timecounter = { 102239278Sgonzo .tc_get_timecount = lpc_get_timecount, 103239278Sgonzo .tc_name = "LPC32x0 Timer1", 104239278Sgonzo .tc_frequency = 0, /* will be filled later */ 105239278Sgonzo .tc_counter_mask = ~0u, 106239278Sgonzo .tc_quality = 1000, 107239278Sgonzo}; 108239278Sgonzo 109239278Sgonzostatic int 110239278Sgonzolpc_timer_probe(device_t dev) 111239278Sgonzo{ 112239278Sgonzo 113261410Sian if (!ofw_bus_status_okay(dev)) 114261410Sian return (ENXIO); 115261410Sian 116239278Sgonzo if (!ofw_bus_is_compatible(dev, "lpc,timer")) 117239278Sgonzo return (ENXIO); 118239278Sgonzo 119239278Sgonzo device_set_desc(dev, "LPC32x0 timer"); 120239278Sgonzo return (BUS_PROBE_DEFAULT); 121239278Sgonzo} 122239278Sgonzo 123239278Sgonzostatic int 124239278Sgonzolpc_timer_attach(device_t dev) 125239278Sgonzo{ 126239278Sgonzo void *intrcookie; 127239278Sgonzo struct lpc_timer_softc *sc = device_get_softc(dev); 128239278Sgonzo phandle_t node; 129239278Sgonzo uint32_t freq; 130239278Sgonzo 131239278Sgonzo if (timer_softc) 132239278Sgonzo return (ENXIO); 133239278Sgonzo 134239278Sgonzo timer_softc = sc; 135239278Sgonzo 136239278Sgonzo if (bus_alloc_resources(dev, lpc_timer_spec, sc->lt_res)) { 137239278Sgonzo device_printf(dev, "could not allocate resources\n"); 138239278Sgonzo return (ENXIO); 139239278Sgonzo } 140239278Sgonzo 141239278Sgonzo sc->lt_bst0 = rman_get_bustag(sc->lt_res[0]); 142239278Sgonzo sc->lt_bsh0 = rman_get_bushandle(sc->lt_res[0]); 143239278Sgonzo sc->lt_bst1 = rman_get_bustag(sc->lt_res[1]); 144239278Sgonzo sc->lt_bsh1 = rman_get_bushandle(sc->lt_res[1]); 145239278Sgonzo 146239278Sgonzo if (bus_setup_intr(dev, sc->lt_res[2], INTR_TYPE_CLK, 147239278Sgonzo lpc_hardclock, NULL, sc, &intrcookie)) { 148239278Sgonzo device_printf(dev, "could not setup interrupt handler\n"); 149239278Sgonzo bus_release_resources(dev, lpc_timer_spec, sc->lt_res); 150239278Sgonzo return (ENXIO); 151239278Sgonzo } 152239278Sgonzo 153239278Sgonzo /* Enable timer clock */ 154239278Sgonzo lpc_pwr_write(dev, LPC_CLKPWR_TIMCLK_CTRL1, 155239278Sgonzo LPC_CLKPWR_TIMCLK_CTRL1_TIMER0 | 156239278Sgonzo LPC_CLKPWR_TIMCLK_CTRL1_TIMER1); 157239278Sgonzo 158239278Sgonzo /* Get PERIPH_CLK encoded in parent bus 'bus-frequency' property */ 159239278Sgonzo node = ofw_bus_get_node(dev); 160314503Sian if (OF_getencprop(OF_parent(node), "bus-frequency", &freq, 161239278Sgonzo sizeof(pcell_t)) <= 0) { 162239278Sgonzo bus_release_resources(dev, lpc_timer_spec, sc->lt_res); 163239278Sgonzo bus_teardown_intr(dev, sc->lt_res[2], intrcookie); 164239278Sgonzo device_printf(dev, "could not obtain base clock frequency\n"); 165239278Sgonzo return (ENXIO); 166239278Sgonzo } 167239278Sgonzo 168239278Sgonzo /* Set desired frequency in event timer and timecounter */ 169239278Sgonzo sc->lt_et.et_frequency = (uint64_t)freq; 170239278Sgonzo lpc_timecounter.tc_frequency = (uint64_t)freq; 171239278Sgonzo 172239278Sgonzo sc->lt_et.et_name = "LPC32x0 Timer0"; 173239278Sgonzo sc->lt_et.et_flags = ET_FLAGS_PERIODIC | ET_FLAGS_ONESHOT; 174239278Sgonzo sc->lt_et.et_quality = 1000; 175247463Smav sc->lt_et.et_min_period = (0x00000002LLU << 32) / sc->lt_et.et_frequency; 176247463Smav sc->lt_et.et_max_period = (0xfffffffeLLU << 32) / sc->lt_et.et_frequency; 177239278Sgonzo sc->lt_et.et_start = lpc_timer_start; 178239278Sgonzo sc->lt_et.et_stop = lpc_timer_stop; 179239278Sgonzo sc->lt_et.et_priv = sc; 180239278Sgonzo 181239278Sgonzo et_register(&sc->lt_et); 182239278Sgonzo tc_init(&lpc_timecounter); 183239278Sgonzo 184239278Sgonzo /* Reset and enable timecounter */ 185239278Sgonzo timer1_write_4(sc, LPC_TIMER_TCR, LPC_TIMER_TCR_RESET); 186239278Sgonzo timer1_write_4(sc, LPC_TIMER_TCR, 0); 187239278Sgonzo timer1_clear(sc); 188239278Sgonzo timer1_write_4(sc, LPC_TIMER_TCR, LPC_TIMER_TCR_ENABLE); 189239278Sgonzo 190239278Sgonzo /* DELAY() now can work properly */ 191239278Sgonzo lpc_timer_initialized = 1; 192239278Sgonzo 193239278Sgonzo return (0); 194239278Sgonzo} 195239278Sgonzo 196239278Sgonzostatic int 197247463Smavlpc_timer_start(struct eventtimer *et, sbintime_t first, sbintime_t period) 198239278Sgonzo{ 199239278Sgonzo struct lpc_timer_softc *sc = (struct lpc_timer_softc *)et->et_priv; 200239278Sgonzo uint32_t ticks; 201239278Sgonzo 202247463Smav if (period == 0) { 203239278Sgonzo sc->lt_oneshot = 1; 204247463Smav sc->lt_period = 0; 205247463Smav } else { 206239278Sgonzo sc->lt_oneshot = 0; 207247463Smav sc->lt_period = ((uint32_t)et->et_frequency * period) >> 32; 208239278Sgonzo } 209239278Sgonzo 210247463Smav if (first == 0) 211239278Sgonzo ticks = sc->lt_period; 212247463Smav else 213247463Smav ticks = ((uint32_t)et->et_frequency * first) >> 32; 214239278Sgonzo 215239278Sgonzo /* Reset timer */ 216239278Sgonzo timer0_write_4(sc, LPC_TIMER_TCR, LPC_TIMER_TCR_RESET); 217239278Sgonzo timer0_write_4(sc, LPC_TIMER_TCR, 0); 218239278Sgonzo 219239278Sgonzo /* Start timer */ 220239278Sgonzo timer0_clear(sc); 221239278Sgonzo timer0_write_4(sc, LPC_TIMER_MR0, ticks); 222239278Sgonzo timer0_write_4(sc, LPC_TIMER_MCR, LPC_TIMER_MCR_MR0I | LPC_TIMER_MCR_MR0S); 223239278Sgonzo timer0_write_4(sc, LPC_TIMER_TCR, LPC_TIMER_TCR_ENABLE); 224239278Sgonzo return (0); 225239278Sgonzo} 226239278Sgonzo 227239278Sgonzostatic int 228239278Sgonzolpc_timer_stop(struct eventtimer *et) 229239278Sgonzo{ 230239278Sgonzo struct lpc_timer_softc *sc = (struct lpc_timer_softc *)et->et_priv; 231239278Sgonzo 232239278Sgonzo timer0_write_4(sc, LPC_TIMER_TCR, 0); 233239278Sgonzo return (0); 234239278Sgonzo} 235239278Sgonzo 236239278Sgonzostatic device_method_t lpc_timer_methods[] = { 237239278Sgonzo DEVMETHOD(device_probe, lpc_timer_probe), 238239278Sgonzo DEVMETHOD(device_attach, lpc_timer_attach), 239239278Sgonzo { 0, 0 } 240239278Sgonzo}; 241239278Sgonzo 242239278Sgonzostatic driver_t lpc_timer_driver = { 243239278Sgonzo "timer", 244239278Sgonzo lpc_timer_methods, 245239278Sgonzo sizeof(struct lpc_timer_softc), 246239278Sgonzo}; 247239278Sgonzo 248239278Sgonzostatic devclass_t lpc_timer_devclass; 249239278Sgonzo 250239278SgonzoDRIVER_MODULE(timer, simplebus, lpc_timer_driver, lpc_timer_devclass, 0, 0); 251239278Sgonzo 252239278Sgonzostatic int 253239278Sgonzolpc_hardclock(void *arg) 254239278Sgonzo{ 255239278Sgonzo struct lpc_timer_softc *sc = (struct lpc_timer_softc *)arg; 256239278Sgonzo 257239278Sgonzo /* Reset pending interrupt */ 258239278Sgonzo timer0_write_4(sc, LPC_TIMER_IR, 0xffffffff); 259239278Sgonzo 260239278Sgonzo /* Start timer again */ 261239278Sgonzo if (!sc->lt_oneshot) { 262239278Sgonzo timer0_clear(sc); 263239278Sgonzo timer0_write_4(sc, LPC_TIMER_MR0, sc->lt_period); 264239278Sgonzo timer0_write_4(sc, LPC_TIMER_TCR, LPC_TIMER_TCR_ENABLE); 265239278Sgonzo } 266239278Sgonzo 267239278Sgonzo if (sc->lt_et.et_active) 268239278Sgonzo sc->lt_et.et_event_cb(&sc->lt_et, sc->lt_et.et_arg); 269239278Sgonzo 270239278Sgonzo return (FILTER_HANDLED); 271239278Sgonzo} 272239278Sgonzo 273239278Sgonzostatic unsigned 274239278Sgonzolpc_get_timecount(struct timecounter *tc) 275239278Sgonzo{ 276239278Sgonzo return timer1_read_4(timer_softc, LPC_TIMER_TC); 277239278Sgonzo} 278239278Sgonzo 279239278Sgonzovoid 280239278SgonzoDELAY(int usec) 281239278Sgonzo{ 282239278Sgonzo uint32_t counter; 283239278Sgonzo uint32_t first, last; 284239278Sgonzo int val = (lpc_timecounter.tc_frequency / 1000000 + 1) * usec; 285239278Sgonzo 286239278Sgonzo /* Timer is not initialized yet */ 287239278Sgonzo if (!lpc_timer_initialized) { 288239278Sgonzo for (; usec > 0; usec--) 289239278Sgonzo for (counter = 100; counter > 0; counter--) 290239278Sgonzo ; 291239278Sgonzo return; 292239278Sgonzo } 293239278Sgonzo 294239278Sgonzo first = lpc_get_timecount(&lpc_timecounter); 295239278Sgonzo while (val > 0) { 296239278Sgonzo last = lpc_get_timecount(&lpc_timecounter); 297239278Sgonzo if (last < first) { 298239278Sgonzo /* Timer rolled over */ 299239278Sgonzo last = first; 300239278Sgonzo } 301239278Sgonzo 302239278Sgonzo val -= (last - first); 303239278Sgonzo first = last; 304239278Sgonzo } 305239278Sgonzo} 306