wii - char driver for gba / joybus devices

etc/etc.evbppc/MAKEDEV.conf

@@ -26,6 +26,8 @@ all_md)
 	makedev virtio
 	;;
 
+# TODO - i think i can add something here to create my device files
+# instead of manually calling mknod i just dont know yet..
 # ramdisk definition is found at distrib/evbppc/ramdisk/Makefile
 
 xlcom[0-9]*)

sys/arch/evbppc/conf/NINTENDO

@@ -133,6 +133,7 @@ options 	WSDISPLAY_MULTICONS
 ahb0 		at mainbus0 irq 14
 si0		at mainbus0 addr 0x0d006400 irq 3	# Serial interface
 uhid*		at si0
+gcport*		at si0
 exi0		at mainbus0 addr 0x0d006800 irq 4	# External interface
 rtcsram0	at exi0					# RTC/SRAM chip
 gecko0		at exi0					# USB Gecko

sys/arch/evbppc/conf/majors.evbppc

@@ -83,6 +83,8 @@ device-major	twe		char 76 		twe
 #device-major	obsolete	char 98			obsolete (nsmb)
 device-major 	xlcom 		char 99 		xlcom
 
+device-major	gcport		char 100
+
 # Majors up to 143 are reserved for machine-dependent drivers.
 # New machine-independent driver majors are assigned in 
 # sys/conf/majors.

sys/arch/evbppc/nintendo/dev/files.dev

@@ -37,6 +37,10 @@ file	arch/evbppc/nintendo/dev/si.c			si
 attach	uhid at si with uhid_si
 file	arch/evbppc/nintendo/dev/uhid_si.c		uhid_si
 
+device	gcport
+attach	gcport at si with gcport_si
+file	arch/evbppc/nintendo/dev/gcport_si.c		gcport_si
+
 define	ahb { [addr=-1], [irq=-1] }
 device	ahb: ahb
 attach	ahb at mainbus

sys/arch/evbppc/nintendo/dev/gcport_si.c

@@ -0,0 +1,237 @@
+/* $NetBSD: gcport_si.c,v 1.0 2026/05/18 22:54:30 gummybuns Exp $ */
+
+/*-
+ * Copyright (c) 2026 ZacBrown <gummybuns@protonmail.com>
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
+ * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
+ * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
+ * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
+ * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
+ * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
+ * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
+ * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
+ * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+ * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+ * SUCH DAMAGE.
+ */
+
+#include <sys/cdefs.h>
+__KERNEL_RCSID(0, "$NetBSD: gcport_si.c,v 1.0 2026/05/18 22:53:30 gummybuns Exp $");
+
+#include <sys/bus.h>
+#include <sys/conf.h>
+#include <sys/device.h>
+#include <sys/ioccom.h>
+#include <sys/kmem.h>
+#include <sys/mutex.h>
+#include <sys/param.h>
+#include <sys/systm.h>
+#include <sys/tty.h>
+#include <sys/types.h>
+
+#include <dev/usb/usb.h>
+#include <dev/hid/uhid.h>
+
+#include "si.h"
+#include "joybus.h"
+
+struct si_payload {
+	uint32_t 	insize;		/* bytes to receive. max 128 */
+	uint32_t 	outsize;	/* bytes to send. max 128 */
+	uint32_t	*status;	/* sisr status for this channel */
+	void		*in;		/* buffer to store response */
+	void		*out;		/* buffer to send out to device */
+	long		delay;		/* delay the transaction (microsec) */
+};
+
+extern struct cfdriver gcport_cd;
+struct gcport_softc {
+	device_t		sc_dev;
+	struct si_channel	*ch;
+	bus_space_tag_t		sc_bst;
+	bus_space_handle_t	sc_bsh;
+};
+
+
+#define SI_SEND		_IOWR(0, 1, struct si_payload)
+
+static int gcport_si_match(device_t, cfdata_t, void *);
+static void gcport_si_attach(device_t, device_t, void *);
+static int siioctl_send(struct si_channel *ch, struct si_payload *sp);
+
+dev_type_open(gcport_open);
+dev_type_close(gcport_close);
+dev_type_ioctl(gcport_ioctl);
+
+const struct cdevsw gcport_cdevsw = {
+	.d_open = gcport_open,
+	.d_close = gcport_close,
+	.d_ioctl = gcport_ioctl,
+	.d_read = noread,
+	.d_write = nowrite,
+	.d_stop = nostop,
+	.d_tty = notty,
+	.d_poll = nopoll,
+	.d_mmap = nommap,
+	.d_kqfilter = nokqfilter,
+	.d_discard = nodiscard,
+	.d_flag = D_OTHER
+};
+
+CFATTACH_DECL_NEW(gcport_si, sizeof(struct gcport_softc),
+	gcport_si_match, gcport_si_attach, NULL, NULL);
+
+static int
+gcport_si_match(device_t parent, cfdata_t cf, void *aux)
+{
+	struct si_softc * const sc = device_private(parent);
+	struct si_attach_args * const saa = aux;
+	struct si_channel *ch;
+	unsigned chan;
+
+	chan = saa->saa_index;
+	ch = &sc->sc_chan[chan];
+	aprint_normal("gcport: checking 0x%08X...\n", ch->ch_id);
+	/* NOTE - existing functionality uses uhid for gc_pad. This will
+	 * match any other device
+	 */
+	if (ch->ch_id != 0 && !(IS_GCPAD(ch->ch_id))) {
+		aprint_normal("gcport: identified ch%d as a device 0x%08X\n",
+		    chan, ch->ch_id);
+		return 1;
+	}
+
+	return 0;
+}
+
+static void
+gcport_si_attach(device_t parent, device_t self, void *aux)
+{
+	struct si_softc * const psc = device_private(parent);
+	struct si_attach_args * const saa = aux;
+	struct gcport_softc * const sc = device_private(self);
+	struct si_channel *ch = &psc->sc_chan[saa->saa_index];
+
+	sc->sc_dev = self;
+	sc->ch = ch;
+	sc->sc_bst = psc->sc_bst;
+	sc->sc_bsh = psc->sc_bsh;
+}
+
+int
+gcport_open(dev_t dev, int flags, int mode, struct lwp *l)
+{
+	struct gcport_softc *sc;
+	struct si_channel *ch;
+	int error;
+
+	/* TODO maybe there is a way to have the minor number reflect the
+	 * actual port instead of an auto increment thing
+	 */
+	sc = device_lookup_private(&gcport_cd, minor(dev));
+
+	if (sc == NULL) {
+		return ENXIO;
+	}
+
+	ch = sc->ch;
+	mutex_enter(&ch->ch_lock);
+
+	if (ISSET(ch->ch_state, SI_STATE_OPEN)) {
+		error = EBUSY;
+		goto unlock;
+	}
+
+	ch->ch_state |= SI_STATE_OPEN;
+	error = 0;
+unlock:
+	mutex_exit(&ch->ch_lock);
+	return error;
+}
+
+int
+gcport_close(dev_t dev, int flags, int mode, struct lwp *l)
+{
+	struct gcport_softc *sc = device_lookup_private(&gcport_cd, minor(dev));
+	struct si_channel *ch = sc->ch;
+
+	mutex_enter(&ch->ch_lock);
+	ch->ch_state &= ~(SI_STATE_OPEN | SI_STATE_STOPPED);
+
+	/* cv_init is called in parent's si_attach */
+	cv_broadcast(&ch->ch_cv);
+
+	mutex_exit(&ch->ch_lock);
+	return 0;
+}
+
+int
+gcport_ioctl(dev_t dev, u_long cmd, void *data, int flag, struct lwp *l)
+{
+	struct gcport_softc *sc = device_lookup_private(&gcport_cd, minor(dev));
+	struct si_channel *ch = sc->ch;
+	int err;
+
+	switch(cmd) {
+	case SI_SEND:
+		err = siioctl_send(ch, (struct si_payload *)data);
+		break;
+	default:
+		err = EINVAL;
+		break;
+	}
+
+	return err;
+}
+
+static int
+siioctl_send(struct si_channel *ch, struct si_payload *gbs)
+{
+	int err;
+	struct si_softc *sc;
+	struct siio_send sd;
+
+	err = 0;
+	sc = ch->ch_sc;
+	if (gbs->outsize > SIIOBUF_SIZE || gbs->insize > SIIOBUF_SIZE) {
+		return EINVAL;
+	}
+
+	sd.chan = ch->ch_index;
+	sd.outsize = gbs->outsize;
+	sd.insize = gbs->insize;
+	sd.out = kmem_alloc(gbs->outsize, KM_SLEEP);
+	sd.in = kmem_alloc(gbs->insize, KM_SLEEP);
+	sd.delay = gbs->delay;
+
+	if ((err = copyin(gbs->out, sd.out, sd.outsize)) != 0) {
+		goto si_send_cleanup;
+	}
+
+	if ((err = __si_send(sc, &sd)) != 0) {
+		goto si_send_cleanup;
+	}
+
+	if ((err = copyout(sd.in, gbs->in, sd.insize)) != 0) {
+		goto si_send_cleanup;
+	}
+
+	if ((err = copyout(&sd.status, gbs->status, sizeof(uint32_t))) != 0) {
+		goto si_send_cleanup;
+	}
+si_send_cleanup:
+	kmem_free(sd.out, sd.outsize);
+	kmem_free(sd.in, sd.insize);
+	return err;
+}

sys/arch/evbppc/nintendo/dev/joybus.h

@@ -0,0 +1,71 @@
+/* $NetBSD: joybus.h,v 1.0 2026/05/18 22:54:30 gummybuns Exp $ */
+
+/*-
+ * Copyright (c) 2026 Zac Brown <gummybuns@protonmail.com>
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
+ * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
+ * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
+ * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
+ * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
+ * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
+ * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
+ * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
+ * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+ * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+ * SUCH DAMAGE.
+ */
+
+#ifndef _JOYBUS_H_
+#define _JOYBUS_H_
+
+#include <sys/param.h>
+#include "si.h"
+
+#define	JB_WIRELESS		__BIT(15)
+#define	JB_WIRELESS_RECV	__BIT(14)
+#define	JB_RUMBLE		__BIT(13)
+#define JB_CONTROLLER		__BIT(11)
+#define JB_WIRELESS_TYPE	__BIT(10)
+#define	JB_WIRELESS_STATE	__BIT(9)
+#define JB_DOLPHIN		__BIT(8)
+#define JB_WIRELESS_ORIGIN	__BIT(5)
+#define JB_WIRELESS_FIXID	__BIT(4)
+#define JB_WIRELESS_NONCTRL	__BIT(3)
+#define JB_WIRELESS_LITE	__BIT(2)
+
+#define	CMD_IDENTIFY	0x00000000	/* pad with zeros to clear siiobuf */
+#define	CMD_RESET	0xFF000000	/* pad with zeros to clear siiobuf */
+#define	CMD_GBA_READ	0x14
+#define	CMD_GBA_WRITE	0x15
+
+#define JB_NONE		0x0000
+#define	JB_N64		0x0500
+#define	JB_N64MIC	0x0001
+#define	JB_N64KB	0x0002
+#define	JB_N64MS	0x0200
+#define	JB_GBA		0x0004
+#define JB_GC		0x0900
+#define JB_WAVEBRD_RECV	0xe960
+#define JB_WAVEBRD	JB_WIRELESS & JB_RUMBLE & JB_CONTROLLER
+#define JB_GCKB		0x0802
+#define JB_GCSTEER	0x0800
+#define JB_GBABIOS	0x08	/* GBA BIOS actually sends a 1byte response and
+				 * sets SISR to NOREP. The second byte will be
+				 * whatever was in SIIOBUF before send */
+
+#define IS_DOLPHIN(n)	ISSET(n, JB_CONTROLLER)
+#define IS_N64(n)	!ISSET(n, JB_CONTROLLER)
+#define IS_GCPAD(n)	(((n) & (JB_CONTROLLER | JB_DOLPHIN)) == JB_GC) || \
+				ISSET(n, JB_WIRELESS)
+#endif