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/cdefs.h> 28 #include <sys/param.h> 29 #include <sys/systm.h> 30 #include <sys/bus.h> 31 #include <sys/kernel.h> 32 #include <sys/limits.h> 33 #include <sys/lock.h> 34 #include <sys/module.h> 35 #include <sys/mutex.h> 36 #include <sys/resource.h> 37 #include <sys/rman.h> 38 #include <sys/sysctl.h> 39 40 #include <machine/bus.h> 41 42 #include <dev/ofw/openfirm.h> 43 #include <dev/ofw/ofw_bus.h> 44 #include <dev/ofw/ofw_bus_subr.h> 45 46 #include "am335x_pwm.h" 47 48 #define ECAP_TSCTR 0x00 49 #define ECAP_CAP1 0x08 50 #define ECAP_CAP2 0x0C 51 #define ECAP_CAP3 0x10 52 #define ECAP_CAP4 0x14 53 #define ECAP_ECCTL2 0x2A 54 #define ECCTL2_MODE_APWM (1 << 9) 55 #define ECCTL2_SYNCO_SEL (3 << 6) 56 #define ECCTL2_TSCTRSTOP_FREERUN (1 << 4) 57 58 #define ECAP_READ2(_sc, reg) bus_read_2((_sc)->sc_mem_res, reg); 59 #define ECAP_WRITE2(_sc, reg, value) \ 60 bus_write_2((_sc)->sc_mem_res, reg, value); 61 #define ECAP_READ4(_sc, reg) bus_read_4((_sc)->sc_mem_res, reg); 62 #define ECAP_WRITE4(_sc, reg, value) \ 63 bus_write_4((_sc)->sc_mem_res, reg, value); 64 65 #define PWM_LOCK(_sc) mtx_lock(&(_sc)->sc_mtx) 66 #define PWM_UNLOCK(_sc) mtx_unlock(&(_sc)->sc_mtx) 67 #define PWM_LOCK_INIT(_sc) mtx_init(&(_sc)->sc_mtx, \ 68 device_get_nameunit(_sc->sc_dev), "am335x_ecap softc", MTX_DEF) 69 #define PWM_LOCK_DESTROY(_sc) mtx_destroy(&(_sc)->sc_mtx) 70 71 static device_probe_t am335x_ecap_probe; 72 static device_attach_t am335x_ecap_attach; 73 static device_detach_t am335x_ecap_detach; 74 75 struct am335x_ecap_softc { 76 device_t sc_dev; 77 struct mtx sc_mtx; 78 struct resource *sc_mem_res; 79 int sc_mem_rid; 80 }; 81 82 static struct ofw_compat_data compat_data[] = { 83 {"ti,am3352-ecap", true}, 84 {"ti,am33xx-ecap", true}, 85 {NULL, false}, 86 }; 87 SIMPLEBUS_PNP_INFO(compat_data); 88 89 static device_method_t am335x_ecap_methods[] = { 90 DEVMETHOD(device_probe, am335x_ecap_probe), 91 DEVMETHOD(device_attach, am335x_ecap_attach), 92 DEVMETHOD(device_detach, am335x_ecap_detach), 93 94 DEVMETHOD_END 95 }; 96 97 static driver_t am335x_ecap_driver = { 98 "am335x_ecap", 99 am335x_ecap_methods, 100 sizeof(struct am335x_ecap_softc), 101 }; 102 103 /* 104 * API function to set period/duty cycles for ECAPx 105 */ 106 int 107 am335x_pwm_config_ecap(int unit, int period, int duty) 108 { 109 device_t dev; 110 struct am335x_ecap_softc *sc; 111 uint16_t reg; 112 113 dev = devclass_get_device(devclass_find(am335x_ecap_driver.name), unit); 114 if (dev == NULL) 115 return (ENXIO); 116 117 if (duty > period) 118 return (EINVAL); 119 120 if (period == 0) 121 return (EINVAL); 122 123 sc = device_get_softc(dev); 124 PWM_LOCK(sc); 125 126 reg = ECAP_READ2(sc, ECAP_ECCTL2); 127 reg |= ECCTL2_MODE_APWM | ECCTL2_TSCTRSTOP_FREERUN | ECCTL2_SYNCO_SEL; 128 ECAP_WRITE2(sc, ECAP_ECCTL2, reg); 129 130 /* CAP3 in APWM mode is APRD shadow register */ 131 ECAP_WRITE4(sc, ECAP_CAP3, period - 1); 132 133 /* CAP4 in APWM mode is ACMP shadow register */ 134 ECAP_WRITE4(sc, ECAP_CAP4, duty); 135 /* Restart counter */ 136 ECAP_WRITE4(sc, ECAP_TSCTR, 0); 137 138 PWM_UNLOCK(sc); 139 140 return (0); 141 } 142 143 static int 144 am335x_ecap_probe(device_t dev) 145 { 146 147 if (!ofw_bus_status_okay(dev)) 148 return (ENXIO); 149 150 if (!ofw_bus_search_compatible(dev, compat_data)->ocd_data) 151 return (ENXIO); 152 153 device_set_desc(dev, "AM335x eCAP"); 154 155 return (BUS_PROBE_DEFAULT); 156 } 157 158 static int 159 am335x_ecap_attach(device_t dev) 160 { 161 struct am335x_ecap_softc *sc; 162 163 sc = device_get_softc(dev); 164 sc->sc_dev = dev; 165 166 PWM_LOCK_INIT(sc); 167 168 sc->sc_mem_res = bus_alloc_resource_any(dev, SYS_RES_MEMORY, 169 &sc->sc_mem_rid, RF_ACTIVE); 170 if (sc->sc_mem_res == NULL) { 171 device_printf(dev, "cannot allocate memory resources\n"); 172 goto fail; 173 } 174 175 return (0); 176 177 fail: 178 PWM_LOCK_DESTROY(sc); 179 return (ENXIO); 180 } 181 182 static int 183 am335x_ecap_detach(device_t dev) 184 { 185 struct am335x_ecap_softc *sc; 186 187 sc = device_get_softc(dev); 188 189 PWM_LOCK(sc); 190 if (sc->sc_mem_res) 191 bus_release_resource(dev, SYS_RES_MEMORY, 192 sc->sc_mem_rid, sc->sc_mem_res); 193 PWM_UNLOCK(sc); 194 195 PWM_LOCK_DESTROY(sc); 196 197 return (0); 198 } 199 200 DRIVER_MODULE(am335x_ecap, am335x_pwmss, am335x_ecap_driver, 0, 0); 201 MODULE_VERSION(am335x_ecap, 1); 202 MODULE_DEPEND(am335x_ecap, am335x_pwmss, 1, 1, 1); 203