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pgctrl.c revision 1.1 
      1 /*	$NetBSD: pgctrl.c,v 1.1 2026/07/19 01:48:24 thorpej Exp $	*/
      2 
      3 /*-
      4  * Copyright (c) 2026 The NetBSD Foundation, Inc.
      5  * All rights reserved.
      6  *
      7  * This code is derived from software contributed to The NetBSD Foundation
      8  * by Jason R. Thorpe.
      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  * Flattened Device Tree glue for pg68k "control space".
     34  */
     35 
     36 #include <sys/cdefs.h>
     37 __KERNEL_RCSID(0, "$NetBSD: pgctrl.c,v 1.1 2026/07/19 01:48:24 thorpej Exp $");
     38 
     39 #include <sys/param.h>
     40 #include <sys/bus.h>
     41 #include <sys/device.h>
     42 #include <sys/systm.h>
     43 #include <sys/mutex.h>
     44 
     45 #include <dev/fdt/fdtvar.h>
     46 #include <dev/fdt/syscon.h>
     47 
     48 #include <hb68k/pg68k/control.h>
     49 
     50 struct pgctrl_softc {
     51 	device_t	sc_dev;
     52 	kmutex_t	sc_lock;
     53 	struct syscon	sc_syscon;
     54 };
     55 
     56 static const struct device_compatible_entry compat_data[] = {
     57 	{ .compat = "pg68k,control-space" },
     58 	DEVICE_COMPAT_EOL
     59 };
     60 
     61 static void
     62 pgctrl_lock(void *v)
     63 {
     64 	struct pgctrl_softc * const sc = v;
     65 
     66 	mutex_enter(&sc->sc_lock);
     67 }
     68 
     69 static void
     70 pgctrl_unlock(void *v)
     71 {
     72 	struct pgctrl_softc * const sc = v;
     73 
     74 	mutex_exit(&sc->sc_lock);
     75 }
     76 
     77 static uint32_t
     78 pgctrl_read_4(void *v, bus_size_t reg)
     79 {
     80 	struct pgctrl_softc * const sc = v;
     81 
     82 	KASSERT(mutex_owned(&sc->sc_lock));
     83 
     84 	return control_inb(reg);
     85 }
     86 
     87 static void
     88 pgctrl_write_4(void *v, bus_size_t reg, uint32_t val)
     89 {
     90 	struct pgctrl_softc * const sc = v;
     91 
     92 	KASSERT(mutex_owned(&sc->sc_lock));
     93 
     94 	control_outb(reg, (uint8_t)val);
     95 }
     96 
     97 static int
     98 pgctrl_match(device_t parent, cfdata_t cf, void *aux)
     99 {
    100 	struct fdt_attach_args * const faa = aux;
    101 
    102 	return of_compatible_match(faa->faa_phandle, compat_data);
    103 }
    104 
    105 static void
    106 pgctrl_attach(device_t parent, device_t self, void *aux)
    107 {
    108 	struct pgctrl_softc * const sc = device_private(self);
    109 	struct fdt_attach_args * const faa = aux;
    110 	const int phandle = faa->faa_phandle;
    111 
    112 	aprint_naive("\n");
    113 	aprint_normal("\n");
    114 
    115 	sc->sc_dev = self;
    116 	mutex_init(&sc->sc_lock, MUTEX_DEFAULT, IPL_VM);
    117 
    118 	sc->sc_syscon.priv = sc;
    119 	sc->sc_syscon.lock = pgctrl_lock;
    120 	sc->sc_syscon.unlock = pgctrl_unlock;
    121 	sc->sc_syscon.read_4 = pgctrl_read_4;
    122 	sc->sc_syscon.write_4 = pgctrl_write_4;
    123 
    124 	fdtbus_register_syscon(self, phandle, &sc->sc_syscon);
    125 }
    126 
    127 CFATTACH_DECL_NEW(pgctrl, sizeof(struct pgctrl_softc),
    128     pgctrl_match, pgctrl_attach, NULL, NULL);
    129