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sni_gpio.c revision 1.1 
      1 /*	$NetBSD: sni_gpio.c,v 1.1 2020/03/18 08:51:08 nisimura Exp $	*/
      2 
      3 /*-
      4  * Copyright (c) 2020 The NetBSD Foundation, Inc.
      5  * All rights reserved.
      6  *
      7  * This code is derived from software contributed to The NetBSD Foundation
      8  * by Tohru Nishimura.
      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 /*
     33  * Socionext SC2A11 SynQuacer GPIO driver
     34  */
     35 
     36 #include <sys/cdefs.h>
     37 __KERNEL_RCSID(0, "$NetBSD: sni_gpio.c,v 1.1 2020/03/18 08:51:08 nisimura Exp $");
     38 
     39 #include <sys/param.h>
     40 #include <sys/device.h>
     41 #include <sys/systm.h>
     42 #include <sys/gpio.h>
     43 #include <sys/kernel.h>
     44 #include <sys/systm.h>
     45 
     46 #include <machine/endian.h>
     47 #include <sys/bus.h>
     48 #include <sys/intr.h>
     49 
     50 #include <dev/gpio/gpiovar.h>
     51 #include <dev/fdt/fdtvar.h>
     52 
     53 static int snigpio_match(device_t, struct cfdata *, void *);
     54 static void snigpio_attach(device_t, device_t, void *);
     55 
     56 struct snigpio_softc {
     57 	device_t		sc_dev;
     58 	bus_space_tag_t		sc_iot;
     59 	bus_space_handle_t	sc_ioh;
     60 	bus_addr_t		sc_iob;
     61 	bus_size_t		sc_ios;
     62 	kmutex_t		sc_lock;
     63 	struct gpio_chipset_tag	sc_gpio_gc;
     64 	gpio_pin_t		sc_gpio_pins[32];
     65 	int			sc_maxpins;
     66 	int			sc_phandle;
     67 };
     68 
     69 CFATTACH_DECL_NEW(snigpio, sizeof(struct snigpio_softc),
     70     snigpio_match, snigpio_attach, NULL, NULL);
     71 
     72 static int
     73 snigpio_match(device_t parent, struct cfdata *match, void *aux)
     74 {
     75 	static const char * compatible[] = {
     76 		"socionext,synquacer-gpio",
     77 		"fujitsu,mb86s70-gpio",
     78 		NULL
     79 	};
     80 	struct fdt_attach_args * const faa = aux;
     81 
     82 	return of_match_compatible(faa->faa_phandle, compatible);
     83 }
     84 
     85 static void
     86 snigpio_attach(device_t parent, device_t self, void *aux)
     87 {
     88 	struct snigpio_softc * const sc = device_private(self);
     89 	struct fdt_attach_args * const faa = aux;
     90 	prop_dictionary_t dict = device_properties(self);
     91 	const int phandle = faa->faa_phandle;
     92 	struct gpiobus_attach_args gba;
     93 	bus_space_handle_t ioh;
     94 	bus_addr_t addr;
     95 	bus_size_t size;
     96 	_Bool disable;
     97 	int error;
     98 
     99 	prop_dictionary_get_bool(dict, "disable", &disable);
    100 	if (disable) {
    101 		aprint_naive(": disabled\n");
    102 		aprint_normal(": disabled\n");
    103 		return;
    104 	}
    105 	error = fdtbus_get_reg(phandle, 0, &addr, &size);
    106 	if (error) {
    107 		aprint_error(": couldn't get registers\n");
    108 		return;
    109 	}
    110 	error = bus_space_map(faa->faa_bst, addr, size, 0, &ioh);
    111 	if (error) {
    112 		aprint_error(": unable to map device\n");
    113 		return;
    114 	}
    115 
    116 	aprint_naive(": GPIO controller\n");
    117 	aprint_normal(": GPIO controller\n");
    118 
    119 	sc->sc_dev = self;
    120 	sc->sc_phandle = phandle;
    121 	sc->sc_iot = faa->faa_bst;
    122 	sc->sc_ioh = ioh;
    123 	sc->sc_iob = addr;
    124 	sc->sc_ios = size;
    125 	mutex_init(&sc->sc_lock, MUTEX_DEFAULT, IPL_VM);
    126 	sc->sc_maxpins = 32;
    127 
    128 	/* create controller tag */
    129 	sc->sc_gpio_gc.gp_cookie = sc;
    130 	sc->sc_gpio_gc.gp_pin_read = NULL; /* AAA */
    131 	sc->sc_gpio_gc.gp_pin_write = NULL; /* AAA */
    132 	sc->sc_gpio_gc.gp_pin_ctl = NULL; /* AAA */
    133 	sc->sc_gpio_gc.gp_intr_establish = NULL; /* AAA */
    134 	sc->sc_gpio_gc.gp_intr_disestablish = NULL; /* AAA */
    135 	sc->sc_gpio_gc.gp_intr_str = NULL; /* AAA */
    136 
    137 	gba.gba_gc = &sc->sc_gpio_gc;
    138 	gba.gba_pins = &sc->sc_gpio_pins[0];
    139 	gba.gba_npins = sc->sc_maxpins;
    140 	(void) config_found_ia(self, "gpiobus", &gba, gpiobus_print);
    141 
    142 	return;
    143 }
    144