Add bcmmbox, a driver for the VideoCore messagebox interface on BCM283X.

Original work by Neil Ashford and dlg@
Feedback from jsg@
ok kettenis@, dlg@

1 files changed, 100 insertions, 0 deletions

diff --git a/sys/dev/ic/bcm2835_mbox.h b/sys/dev/ic/bcm2835_mbox.h
new file mode 100644
index 00000000000..cdd5a4a437d
--- /dev/null
+++ b/sys/dev/ic/bcm2835_mbox.h
@@ -0,0 +1,100 @@
+/*     $OpenBSD: bcm2835_mbox.h,v 1.1 2020/04/19 14:51:52 tobhe Exp $ */
+
+/*
+ * Copyright (c) 2020 Tobias Heider <tobhe@openbsd.org>
+ * Copyright (c) 2019 Neil Ashford <ashfordneil0@gmail.com>
+ *
+ * Permission to use, copy, modify, and distribute this software for any
+ * purpose with or without fee is hereby granted, provided that the above
+ * copyright notice and this permission notice appear in all copies.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
+ * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
+ * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
+ * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
+ * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
+ * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
+ * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
+ */
+
+/*-
+ * Copyright (c) 2012 The NetBSD Foundation, Inc.
+ * All rights reserved.
+ *
+ * This code is derived from software contributed to The NetBSD Foundation
+ * by Nick Hudson
+ *
+ * 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 NETBSD FOUNDATION, INC. AND CONTRIBUTORS
+ * ``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 FOUNDATION OR CONTRIBUTORS
+ * 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 BCM2835_MBOX_H
+#define BCM2835_MBOX_H
+
+#define BCMMBOX_NUM_CHANNELS 16
+#define BCMMBOX_CHANNEL_MASK 0xf
+
+/* mailbox 0 (from VC) and mailbox 1 (to VC) */
+#define BCMMBOX_SIZE 0x80
+
+#define BCMMBOX_READ 0x00
+#define BCMMBOX_WRITE 0x00
+#define BCMMBOX_POLL 0x10   /* read without popping the fifo */
+#define BCMMBOX_ID 0x14     /* sender ID (bottom two bits) */
+#define BCMMBOX_STATUS 0x18 /* status */
+#define  BCMMBOX_STATUS_FULL 0x80000000
+#define  BCMMBOX_STATUS_EMPTY 0x40000000
+#define  BCMMBOX_STATUS_LEVEL 0x400000FF
+#define BCMMBOX_CFG 0x1C /* configuration */
+#define  BCMMBOX_CFG_DATA_IRQ_EN 0x00000001
+#define  BCMMBOX_CFG_SPACE_IRQ_EN 0x00000002
+#define  BCMMBOX_CFG_EMPTYOP_IRQ_EN 0x00000004
+#define  BCMMBOX_CFG_MAIL_CLEAR 0x00000008
+#define  BCMMBOX_CFG_DATA_PENDING 0x00000010
+#define  BCMMBOX_CFG_SPACE_PENDING 0x00000020
+#define  BCMMBOX_CFG_EMPTY_OP_PENDING 0x00000040
+#define  BCMMBOX_CFG_E_NO_OWN 0x00000100
+#define  BCMMBOX_CFG_E_OVERFLOW 0x00000200
+#define  BCMMBOX_CFG_E_UNDERFLOW 0x00000400
+
+#define BCMMBOX0_BASE 0x00
+#define BCMMBOX1_BASE 0x20
+
+#define BCMMBOX0_READ (BCMMBOX0_BASE + BCMMBOX_READ)
+#define BCMMBOX0_WRITE (BCMMBOX0_BASE + BCMMBOX_WRITE)
+#define BCMMBOX0_POLL (BCMMBOX0_BASE + BCMMBOX_POLL)
+#define BCMMBOX0_ID (BCMMBOX0_BASE + BCMMBOX_ID)
+#define BCMMBOX0_STATUS (BCMMBOX0_BASE + BCMMBOX_STATUS)
+#define BCMMBOX0_CFG (BCMMBOX0_BASE + BCMMBOX_READ)
+
+#define BCMMBOX1_READ (BCMMBOX1_BASE + BCMMBOX_READ)
+#define BCMMBOX1_WRITE (BCMMBOX1_BASE + BCMMBOX_WRITE)
+#define BCMMBOX1_POLL (BCMMBOX1_BASE + BCMMBOX_POLL)
+#define BCMMBOX1_ID (BCMMBOX1_BASE + BCMMBOX_ID)
+#define BCMMBOX1_STATUS (BCMMBOX1_BASE + BCMMBOX_STATUS)
+#define BCMMBOX1_CFG (BCMMBOX1_BASE + BCMMBOX_READ)
+
+void bcmmbox_read(uint8_t chan, uint32_t *data);
+void bcmmbox_write(uint8_t chan, uint32_t data);
+
+int bcmmbox_post(uint8_t, void *, size_t, uint32_t *);
+
+#endif /* BCM2835_MBOX_H */