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/fdt/simplebus.h> 42 #include <dev/ofw/openfirm.h> 43 #include <dev/ofw/ofw_bus.h> 44 #include <dev/ofw/ofw_bus_subr.h> 45 46 #include <arm/ti/ti_sysc.h> 47 48 #include <dev/syscon/syscon.h> 49 #include "syscon_if.h" 50 51 #include "am335x_pwm.h" 52 #include "am335x_scm.h" 53 54 #define PWMSS_IDVER 0x00 55 #define PWMSS_SYSCONFIG 0x04 56 #define PWMSS_CLKCONFIG 0x08 57 #define CLKCONFIG_EPWMCLK_EN (1 << 8) 58 #define PWMSS_CLKSTATUS 0x0C 59 60 /* TRM chapter 2 memory map table 2-3 + VER register location */ 61 #define PWMSS_REV_0 0x0000 62 #define PWMSS_REV_1 0x2000 63 #define PWMSS_REV_2 0x4000 64 65 static device_probe_t am335x_pwmss_probe; 66 static device_attach_t am335x_pwmss_attach; 67 static device_detach_t am335x_pwmss_detach; 68 69 struct am335x_pwmss_softc { 70 struct simplebus_softc sc_simplebus; 71 device_t sc_dev; 72 struct syscon *syscon; 73 }; 74 75 static device_method_t am335x_pwmss_methods[] = { 76 DEVMETHOD(device_probe, am335x_pwmss_probe), 77 DEVMETHOD(device_attach, am335x_pwmss_attach), 78 DEVMETHOD(device_detach, am335x_pwmss_detach), 79 80 DEVMETHOD_END 81 }; 82 83 static int 84 am335x_pwmss_probe(device_t dev) 85 { 86 87 if (!ofw_bus_status_okay(dev)) 88 return (ENXIO); 89 90 if (!ofw_bus_is_compatible(dev, "ti,am33xx-pwmss")) 91 return (ENXIO); 92 93 device_set_desc(dev, "AM335x PWM"); 94 95 return (BUS_PROBE_DEFAULT); 96 } 97 98 static int 99 am335x_pwmss_attach(device_t dev) 100 { 101 struct am335x_pwmss_softc *sc; 102 uint32_t reg, id; 103 uint64_t rev_address; 104 phandle_t node, opp_table; 105 106 sc = device_get_softc(dev); 107 sc->sc_dev = dev; 108 109 /* FIXME: For now; Go and kidnap syscon from opp-table */ 110 opp_table = OF_finddevice("/opp-table"); 111 if (opp_table == -1) { 112 device_printf(dev, "Cant find /opp-table\n"); 113 return (ENXIO); 114 } 115 if (!OF_hasprop(opp_table, "syscon")) { 116 device_printf(dev, "/opp-table doesnt have required syscon property\n"); 117 return (ENXIO); 118 } 119 if (syscon_get_by_ofw_property(dev, opp_table, "syscon", &sc->syscon) != 0) { 120 device_printf(dev, "Failed to get syscon\n"); 121 return (ENXIO); 122 } 123 124 ti_sysc_clock_enable(device_get_parent(dev)); 125 126 rev_address = ti_sysc_get_rev_address(device_get_parent(dev)); 127 switch (rev_address) { 128 case PWMSS_REV_0: 129 id = 0; 130 break; 131 case PWMSS_REV_1: 132 id = 1; 133 break; 134 case PWMSS_REV_2: 135 id = 2; 136 break; 137 } 138 139 reg = SYSCON_READ_4(sc->syscon, SCM_PWMSS_CTRL); 140 reg |= (1 << id); 141 SYSCON_WRITE_4(sc->syscon, SCM_PWMSS_CTRL, reg); 142 143 node = ofw_bus_get_node(dev); 144 145 if (node == -1) 146 return (ENXIO); 147 148 simplebus_init(dev, node); 149 150 /* 151 * Allow devices to identify. 152 */ 153 bus_generic_probe(dev); 154 155 /* 156 * Now walk the OFW tree and attach top-level devices. 157 */ 158 for (node = OF_child(node); node > 0; node = OF_peer(node)) 159 simplebus_add_device(dev, node, 0, NULL, -1, NULL); 160 161 return (bus_generic_attach(dev)); 162 } 163 164 static int 165 am335x_pwmss_detach(device_t dev) 166 { 167 168 return (0); 169 } 170 171 DEFINE_CLASS_1(am335x_pwmss, am335x_pwmss_driver, am335x_pwmss_methods, 172 sizeof(struct am335x_pwmss_softc), simplebus_driver); 173 DRIVER_MODULE(am335x_pwmss, simplebus, am335x_pwmss_driver, 0, 0); 174 MODULE_VERSION(am335x_pwmss, 1); 175 MODULE_DEPEND(am335x_pwmss, ti_sysc, 1, 1, 1); 176