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 __FBSDID("$FreeBSD$"); 29 30 #include <sys/param.h> 31 #include <sys/systm.h> 32 #include <sys/bus.h> 33 #include <sys/kernel.h> 34 #include <sys/limits.h> 35 #include <sys/lock.h> 36 #include <sys/module.h> 37 #include <sys/mutex.h> 38 #include <sys/resource.h> 39 #include <sys/rman.h> 40 #include <sys/sysctl.h> 41 42 #include <machine/bus.h> 43 44 #include <dev/fdt/fdt_common.h> 45 #include <dev/fdt/simplebus.h> 46 #include <dev/ofw/openfirm.h> 47 #include <dev/ofw/ofw_bus.h> 48 #include <dev/ofw/ofw_bus_subr.h> 49 50 #include <arm/ti/ti_prcm.h> 51 #include <arm/ti/ti_hwmods.h> 52 #include <arm/ti/ti_scm.h> 53 54 #include "am335x_pwm.h" 55 #include "am335x_scm.h" 56 57 #define PWMSS_IDVER 0x00 58 #define PWMSS_SYSCONFIG 0x04 59 #define PWMSS_CLKCONFIG 0x08 60 #define CLKCONFIG_EPWMCLK_EN (1 << 8) 61 #define PWMSS_CLKSTATUS 0x0C 62 63 static device_probe_t am335x_pwmss_probe; 64 static device_attach_t am335x_pwmss_attach; 65 static device_detach_t am335x_pwmss_detach; 66 67 struct am335x_pwmss_softc { 68 struct simplebus_softc sc_simplebus; 69 device_t sc_dev; 70 clk_ident_t sc_clk; 71 }; 72 73 static device_method_t am335x_pwmss_methods[] = { 74 DEVMETHOD(device_probe, am335x_pwmss_probe), 75 DEVMETHOD(device_attach, am335x_pwmss_attach), 76 DEVMETHOD(device_detach, am335x_pwmss_detach), 77 78 DEVMETHOD_END 79 }; 80 81 static int 82 am335x_pwmss_probe(device_t dev) 83 { 84 85 if (!ofw_bus_status_okay(dev)) 86 return (ENXIO); 87 88 if (!ofw_bus_is_compatible(dev, "ti,am33xx-pwmss")) 89 return (ENXIO); 90 91 device_set_desc(dev, "AM335x PWM"); 92 93 return (BUS_PROBE_DEFAULT); 94 } 95 96 static int 97 am335x_pwmss_attach(device_t dev) 98 { 99 struct am335x_pwmss_softc *sc; 100 uint32_t reg, id; 101 phandle_t node; 102 103 sc = device_get_softc(dev); 104 sc->sc_dev = dev; 105 106 sc->sc_clk = ti_hwmods_get_clock(dev); 107 if (sc->sc_clk == INVALID_CLK_IDENT) { 108 device_printf(dev, "failed to get device id based on ti,hwmods\n"); 109 return (EINVAL); 110 } 111 112 ti_prcm_clk_enable(sc->sc_clk); 113 ti_scm_reg_read_4(SCM_PWMSS_CTRL, ®); 114 switch (sc->sc_clk) { 115 case PWMSS0_CLK: 116 id = 0; 117 break; 118 case PWMSS1_CLK: 119 id = 1; 120 break; 121 122 case PWMSS2_CLK: 123 id = 2; 124 break; 125 default: 126 device_printf(dev, "unknown pwmss clock id: %d\n", sc->sc_clk); 127 return (EINVAL); 128 } 129 reg |= (1 << id); 130 ti_scm_reg_write_4(SCM_PWMSS_CTRL, reg); 131 132 node = ofw_bus_get_node(dev); 133 134 if (node == -1) 135 return (ENXIO); 136 137 simplebus_init(dev, node); 138 139 /* 140 * Allow devices to identify. 141 */ 142 bus_generic_probe(dev); 143 144 /* 145 * Now walk the OFW tree and attach top-level devices. 146 */ 147 for (node = OF_child(node); node > 0; node = OF_peer(node)) 148 simplebus_add_device(dev, node, 0, NULL, -1, NULL); 149 150 return (bus_generic_attach(dev)); 151 } 152 153 static int 154 am335x_pwmss_detach(device_t dev) 155 { 156 157 return (0); 158 } 159 160 DEFINE_CLASS_1(am335x_pwmss, am335x_pwmss_driver, am335x_pwmss_methods, 161 sizeof(struct am335x_pwmss_softc), simplebus_driver); 162 static devclass_t am335x_pwmss_devclass; 163 DRIVER_MODULE(am335x_pwmss, simplebus, am335x_pwmss_driver, am335x_pwmss_devclass, 0, 0); 164 MODULE_VERSION(am335x_pwmss, 1); 165