1 /* $NetBSD: usbnopphy.c,v 1.1 2019/10/30 21:37:56 jmcneill Exp $ */ 2 3 /*- 4 * Copyright (c) 2019 Jared McNeill <jmcneill@invisible.ca> 5 * All rights reserved. 6 * 7 * Redistribution and use in source and binary forms, with or without 8 * modification, are permitted provided that the following conditions 9 * are met: 10 * 1. Redistributions of source code must retain the above copyright 11 * notice, this list of conditions and the following disclaimer. 12 * 2. Redistributions in binary form must reproduce the above copyright 13 * notice, this list of conditions and the following disclaimer in the 14 * documentation and/or other materials provided with the distribution. 15 * 16 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS 17 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED 18 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 19 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS 20 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 21 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 22 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 23 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 24 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 25 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 26 * POSSIBILITY OF SUCH DAMAGE. 27 */ 28 29 #include <sys/cdefs.h> 30 31 __KERNEL_RCSID(0, "$NetBSD: usbnopphy.c,v 1.1 2019/10/30 21:37:56 jmcneill Exp $"); 32 33 #include <sys/param.h> 34 #include <sys/bus.h> 35 #include <sys/device.h> 36 #include <sys/intr.h> 37 #include <sys/systm.h> 38 #include <sys/time.h> 39 40 #include <dev/fdt/fdtvar.h> 41 42 static int usbnopphy_match(device_t, cfdata_t, void *); 43 static void usbnopphy_attach(device_t, device_t, void *); 44 45 static const char * const compatible[] = { 46 "usb-nop-xceiv", 47 NULL 48 }; 49 50 struct usbnopphy_softc { 51 device_t sc_dev; 52 53 struct clk *sc_clk; 54 struct fdtbus_regulator *sc_reg; 55 struct fdtbus_gpio_pin *sc_pin_reset; 56 struct fdtbus_gpio_pin *sc_pin_vbus_det; 57 }; 58 59 CFATTACH_DECL_NEW(usbnopphy, sizeof(struct usbnopphy_softc), 60 usbnopphy_match, usbnopphy_attach, NULL, NULL); 61 62 static void * 63 usbnopphy_acquire(device_t dev, const void *data, size_t len) 64 { 65 struct usbnopphy_softc * const sc = device_private(dev); 66 67 return sc; 68 } 69 70 static void 71 usbnopphy_release(device_t dev, void *priv) 72 { 73 } 74 75 static int 76 usbnopphy_enable(device_t dev, void *priv, bool enable) 77 { 78 struct usbnopphy_softc * const sc = device_private(dev); 79 int error; 80 81 if (enable) { 82 if (sc->sc_reg != NULL) { 83 error = fdtbus_regulator_enable(sc->sc_reg); 84 if (error != 0) 85 return error; 86 } 87 if (sc->sc_clk != NULL) { 88 error = clk_enable(sc->sc_clk); 89 if (error != 0) 90 return error; 91 } 92 if (sc->sc_pin_reset != NULL) { 93 fdtbus_gpio_write(sc->sc_pin_reset, 1); 94 delay(20000); 95 fdtbus_gpio_write(sc->sc_pin_reset, 0); 96 } 97 } else { 98 if (sc->sc_pin_reset != NULL) 99 fdtbus_gpio_write(sc->sc_pin_reset, 1); 100 if (sc->sc_reg != NULL) 101 fdtbus_regulator_disable(sc->sc_reg); 102 if (sc->sc_clk != NULL) 103 clk_disable(sc->sc_clk); 104 } 105 106 return 0; 107 } 108 109 const struct fdtbus_phy_controller_func usbnopphy_funcs = { 110 .acquire = usbnopphy_acquire, 111 .release = usbnopphy_release, 112 .enable = usbnopphy_enable, 113 }; 114 115 static int 116 usbnopphy_match(device_t parent, cfdata_t cf, void *aux) 117 { 118 struct fdt_attach_args * const faa = aux; 119 120 return of_match_compatible(faa->faa_phandle, compatible); 121 } 122 123 static void 124 usbnopphy_attach(device_t parent, device_t self, void *aux) 125 { 126 struct usbnopphy_softc * const sc = device_private(self); 127 struct fdt_attach_args * const faa = aux; 128 const int phandle = faa->faa_phandle; 129 130 sc->sc_dev = self; 131 132 sc->sc_reg = fdtbus_regulator_acquire(phandle, "vbus-regulator"); 133 sc->sc_clk = fdtbus_clock_get(phandle, "main_clk"); 134 sc->sc_pin_reset = fdtbus_gpio_acquire(phandle, "reset-gpios", GPIO_PIN_OUTPUT); 135 136 aprint_naive("\n"); 137 aprint_normal(": USB PHY\n"); 138 139 fdtbus_register_phy_controller(self, phandle, &usbnopphy_funcs); 140 } 141