1 /*- 2 * Copyright (c) 2013 Oleksandr Tymoshenko <gonzo@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 AND CONTRIBUTORS ``AS IS'' AND 15 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 16 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 17 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 18 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 19 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 20 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 21 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 22 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 23 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 24 * SUCH DAMAGE. 25 */ 26 27 #include <sys/param.h> 28 #include <sys/systm.h> 29 #include <sys/bus.h> 30 #include <sys/kernel.h> 31 #include <sys/limits.h> 32 #include <sys/lock.h> 33 #include <sys/module.h> 34 #include <sys/mutex.h> 35 #include <sys/resource.h> 36 #include <sys/rman.h> 37 #include <sys/sysctl.h> 38 39 #include <machine/bus.h> 40 41 #include <dev/ofw/openfirm.h> 42 #include <dev/ofw/ofw_bus.h> 43 #include <dev/ofw/ofw_bus_subr.h> 44 45 #include "am335x_pwm.h" 46 47 #define ECAP_TSCTR 0x00 48 #define ECAP_CAP1 0x08 49 #define ECAP_CAP2 0x0C 50 #define ECAP_CAP3 0x10 51 #define ECAP_CAP4 0x14 52 #define ECAP_ECCTL2 0x2A 53 #define ECCTL2_MODE_APWM (1 << 9) 54 #define ECCTL2_SYNCO_SEL (3 << 6) 55 #define ECCTL2_TSCTRSTOP_FREERUN (1 << 4) 56 57 #define ECAP_READ2(_sc, reg) bus_read_2((_sc)->sc_mem_res, reg); 58 #define ECAP_WRITE2(_sc, reg, value) \ 59 bus_write_2((_sc)->sc_mem_res, reg, value); 60 #define ECAP_READ4(_sc, reg) bus_read_4((_sc)->sc_mem_res, reg); 61 #define ECAP_WRITE4(_sc, reg, value) \ 62 bus_write_4((_sc)->sc_mem_res, reg, value); 63 64 #define PWM_LOCK(_sc) mtx_lock(&(_sc)->sc_mtx) 65 #define PWM_UNLOCK(_sc) mtx_unlock(&(_sc)->sc_mtx) 66 #define PWM_LOCK_INIT(_sc) mtx_init(&(_sc)->sc_mtx, \ 67 device_get_nameunit(_sc->sc_dev), "am335x_ecap softc", MTX_DEF) 68 #define PWM_LOCK_DESTROY(_sc) mtx_destroy(&(_sc)->sc_mtx) 69 70 static device_probe_t am335x_ecap_probe; 71 static device_attach_t am335x_ecap_attach; 72 static device_detach_t am335x_ecap_detach; 73 74 struct am335x_ecap_softc { 75 device_t sc_dev; 76 struct mtx sc_mtx; 77 struct resource *sc_mem_res; 78 int sc_mem_rid; 79 }; 80 81 static struct ofw_compat_data compat_data[] = { 82 {"ti,am3352-ecap", true}, 83 {"ti,am33xx-ecap", true}, 84 {NULL, false}, 85 }; 86 SIMPLEBUS_PNP_INFO(compat_data); 87 88 static device_method_t am335x_ecap_methods[] = { 89 DEVMETHOD(device_probe, am335x_ecap_probe), 90 DEVMETHOD(device_attach, am335x_ecap_attach), 91 DEVMETHOD(device_detach, am335x_ecap_detach), 92 93 DEVMETHOD_END 94 }; 95 96 static driver_t am335x_ecap_driver = { 97 "am335x_ecap", 98 am335x_ecap_methods, 99 sizeof(struct am335x_ecap_softc), 100 }; 101 102 /* 103 * API function to set period/duty cycles for ECAPx 104 */ 105 int 106 am335x_pwm_config_ecap(int unit, int period, int duty) 107 { 108 device_t dev; 109 struct am335x_ecap_softc *sc; 110 uint16_t reg; 111 112 dev = devclass_get_device(devclass_find(am335x_ecap_driver.name), unit); 113 if (dev == NULL) 114 return (ENXIO); 115 116 if (duty > period) 117 return (EINVAL); 118 119 if (period == 0) 120 return (EINVAL); 121 122 sc = device_get_softc(dev); 123 PWM_LOCK(sc); 124 125 reg = ECAP_READ2(sc, ECAP_ECCTL2); 126 reg |= ECCTL2_MODE_APWM | ECCTL2_TSCTRSTOP_FREERUN | ECCTL2_SYNCO_SEL; 127 ECAP_WRITE2(sc, ECAP_ECCTL2, reg); 128 129 /* CAP3 in APWM mode is APRD shadow register */ 130 ECAP_WRITE4(sc, ECAP_CAP3, period - 1); 131 132 /* CAP4 in APWM mode is ACMP shadow register */ 133 ECAP_WRITE4(sc, ECAP_CAP4, duty); 134 /* Restart counter */ 135 ECAP_WRITE4(sc, ECAP_TSCTR, 0); 136 137 PWM_UNLOCK(sc); 138 139 return (0); 140 } 141 142 static int 143 am335x_ecap_probe(device_t dev) 144 { 145 146 if (!ofw_bus_status_okay(dev)) 147 return (ENXIO); 148 149 if (!ofw_bus_search_compatible(dev, compat_data)->ocd_data) 150 return (ENXIO); 151 152 device_set_desc(dev, "AM335x eCAP"); 153 154 return (BUS_PROBE_DEFAULT); 155 } 156 157 static int 158 am335x_ecap_attach(device_t dev) 159 { 160 struct am335x_ecap_softc *sc; 161 162 sc = device_get_softc(dev); 163 sc->sc_dev = dev; 164 165 PWM_LOCK_INIT(sc); 166 167 sc->sc_mem_res = bus_alloc_resource_any(dev, SYS_RES_MEMORY, 168 &sc->sc_mem_rid, RF_ACTIVE); 169 if (sc->sc_mem_res == NULL) { 170 device_printf(dev, "cannot allocate memory resources\n"); 171 goto fail; 172 } 173 174 return (0); 175 176 fail: 177 PWM_LOCK_DESTROY(sc); 178 return (ENXIO); 179 } 180 181 static int 182 am335x_ecap_detach(device_t dev) 183 { 184 struct am335x_ecap_softc *sc; 185 186 sc = device_get_softc(dev); 187 188 PWM_LOCK(sc); 189 if (sc->sc_mem_res) 190 bus_release_resource(dev, SYS_RES_MEMORY, 191 sc->sc_mem_rid, sc->sc_mem_res); 192 PWM_UNLOCK(sc); 193 194 PWM_LOCK_DESTROY(sc); 195 196 return (0); 197 } 198 199 DRIVER_MODULE(am335x_ecap, am335x_pwmss, am335x_ecap_driver, 0, 0); 200 MODULE_VERSION(am335x_ecap, 1); 201 MODULE_DEPEND(am335x_ecap, am335x_pwmss, 1, 1, 1); 202