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      1 /*	$NetBSD: usbnode.c,v 1.3 2026/01/17 05:45:17 skrll Exp $	*/
      2 
      3 /*-
      4  * Copyright (c) 2025 The NetBSD Foundation, Inc.
      5  * All rights reserved.
      6  *
      7  * This code is derived from software contributed to The NetBSD Foundation
      8  * by Nick Hudson
      9  *
     10  * Redistribution and use in source and binary forms, with or without
     11  * modification, are permitted provided that the following conditions
     12  * are met:
     13  * 1. Redistributions of source code must retain the above copyright
     14  *    notice, this list of conditions and the following disclaimer.
     15  * 2. Redistributions in binary form must reproduce the above copyright
     16  *    notice, this list of conditions and the following disclaimer in the
     17  *    documentation and/or other materials provided with the distribution.
     18  *
     19  * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
     20  * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
     21  * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
     22  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
     23  * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
     24  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
     25  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
     26  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
     27  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
     28  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
     29  * POSSIBILITY OF SUCH DAMAGE.
     30  */
     31 
     32 #include <sys/cdefs.h>
     33 __KERNEL_RCSID(0, "$NetBSD: usbnode.c,v 1.3 2026/01/17 05:45:17 skrll Exp $");
     34 
     35 #include <sys/param.h>
     36 #include <sys/device.h>
     37 
     38 #include <dev/fdt/fdtvar.h>
     39 
     40 struct usbnode_softc {
     41 	device_t			sc_dev;
     42 	int				sc_phandle;
     43 
     44 	struct fdtbus_gpio_pin *	sc_pin_reset;
     45 	u_int				sc_resetdelay;
     46 };
     47 
     48 struct usbnode_data {
     49 	const char *	und_desc;
     50 	u_int		und_resetdelay;
     51 };
     52 
     53 /* Genesys Logic GL852G usb hub */
     54 static struct usbnode_data genesys_gl852g_data = {
     55 	.und_desc = "Genesys Logic GL852G usb hub",
     56 	.und_resetdelay = 50,
     57 };
     58 
     59 static const struct device_compatible_entry compat_data[] = {
     60 	{ .compat = "usb5e3,610", .data = &genesys_gl852g_data },
     61 	DEVICE_COMPAT_EOL
     62 };
     63 
     64 static void
     65 usbnode_enable(struct usbnode_softc *sc,bool enable)
     66 {
     67 
     68 	if (enable) {
     69 		fdtbus_gpio_write(sc->sc_pin_reset, 1);
     70 		delay(sc->sc_resetdelay);
     71 	}
     72 
     73 	fdtbus_gpio_write(sc->sc_pin_reset, enable ? 0 : 1);
     74 }
     75 
     76 static int
     77 usbnode_match(device_t parent, cfdata_t cf, void *aux)
     78 {
     79 	struct fdt_attach_args * const faa = aux;
     80 
     81 	return of_compatible_match(faa->faa_phandle, compat_data);
     82 }
     83 
     84 static int
     85 usbnode_detach(device_t self, int flags)
     86 {
     87 	struct usbnode_softc * const sc = device_private(self);
     88 
     89 	usbnode_enable(sc, false);
     90 
     91 	return 0;
     92 }
     93 
     94 static void
     95 usbnode_attach(device_t parent, device_t self, void *aux)
     96 {
     97 	struct usbnode_softc * const sc = device_private(self);
     98 	struct fdt_attach_args * const faa = aux;
     99 	const int phandle = faa->faa_phandle;
    100 
    101 	sc->sc_dev = self;
    102 
    103 	const struct device_compatible_entry * const dce =
    104 	    of_compatible_lookup(phandle, compat_data);
    105 
    106 	const struct usbnode_data *und = dce->data;
    107 
    108 	/* reset gpio is ... */
    109 	sc->sc_pin_reset =
    110 	    fdtbus_gpio_acquire(phandle, "reset-gpio", GPIO_PIN_OUTPUT);
    111 	if (sc->sc_pin_reset == NULL) {
    112 		aprint_error(": couldn't acquire reset gpio\n");
    113 	}
    114 
    115 	usbnode_enable(sc, true);
    116 
    117 	aprint_naive("\n");
    118 	aprint_normal(": USB node '%s'\n", und->und_desc);
    119 }
    120 
    121 CFATTACH_DECL_NEW(usbnode, sizeof(struct usbnode_softc),
    122 	usbnode_match, usbnode_attach, usbnode_detach, NULL);
    123