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      1 /* $NetBSD: usbnopphy.c,v 1.2 2021/01/27 03:10:21 thorpej Exp $ */
      2 
      3 /*-
      4  * Copyright (c) 2019 Jared McNeill <jmcneill (at) 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 1.2 2021/01/27 03:10:21 thorpej 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 struct device_compatible_entry compat_data[] = {
     46 	{ .compat = "usb-nop-xceiv" },
     47 	DEVICE_COMPAT_EOL
     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_compatible_match(faa->faa_phandle, compat_data);
    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