openwrtv3/target/linux/brcm2708/patches-4.1/0003-mailbox-bcm2708-Add-bcm2708-vcio.patch

From 6f5003498da677a660cbdfaf9be78d3c0aff2e4c Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Noralf=20Tr=C3=B8nnes?= <noralf@tronnes.org>
Date: Fri, 1 May 2015 19:11:03 +0200
Subject: [PATCH 003/121] mailbox: bcm2708: Add bcm2708-vcio
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
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Signed-off-by: popcornmix <popcornmix@gmail.com>

Copy the arch vcio.c driver to drivers/mailbox.
This is done to make it available on ARCH_BCM2835.

Signed-off-by: Noralf Trønnes <noralf@tronnes.org>

mailbox: bcm2708-vcio: Allocation does not need to be atomic

No need to do atomic allocation in a context that can sleep.

Signed-off-by: Noralf Trønnes <noralf@tronnes.org>

mailbox: bcm2708-vcio: Check the correct status register before writing

With the VC reader blocked and the ARM writing, MAIL0_STA reads
empty permanently while MAIL1_STA goes from empty (0x40000000)
to non-empty (0x00000001-0x00000007) to full (0x80000008).

Suggested-by: Phil Elwell <phil@raspberrypi.org>
Signed-off-by: Noralf Trønnes <noralf@tronnes.org>
---
 drivers/mailbox/Kconfig                       |   6 +
 drivers/mailbox/Makefile                      |   2 +
 drivers/mailbox/bcm2708-vcio.c                | 427 ++++++++++++++++++++++++++
 include/linux/platform_data/mailbox-bcm2708.h | 126 ++++++++
 4 files changed, 561 insertions(+)
 create mode 100644 drivers/mailbox/bcm2708-vcio.c
 create mode 100644 include/linux/platform_data/mailbox-bcm2708.h

--- a/drivers/mailbox/Kconfig
+++ b/drivers/mailbox/Kconfig
@@ -7,6 +7,12 @@ menuconfig MAILBOX
 
 if MAILBOX
 
+config BCM2708_MBOX
+	bool "Broadcom BCM2708 Mailbox (vcio)"
+	depends on MACH_BCM2708 || MACH_BCM2709 || ARCH_BCM2835
+	help
+	  Broadcom BCM2708 Mailbox (vcio)
+
 config ARM_MHU
 	tristate "ARM MHU Mailbox"
 	depends on ARM_AMBA
--- a/drivers/mailbox/Makefile
+++ b/drivers/mailbox/Makefile
@@ -2,6 +2,8 @@
 
 obj-$(CONFIG_MAILBOX)		+= mailbox.o
 
+obj-$(CONFIG_BCM2708_MBOX)	+= bcm2708-vcio.o
+
 obj-$(CONFIG_ARM_MHU)	+= arm_mhu.o
 
 obj-$(CONFIG_PL320_MBOX)	+= pl320-ipc.o
--- /dev/null
+++ b/drivers/mailbox/bcm2708-vcio.c
@@ -0,0 +1,427 @@
+/*
+ *  linux/arch/arm/mach-bcm2708/vcio.c
+ *
+ *  Copyright (C) 2010 Broadcom
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ *
+ * This device provides a shared mechanism for writing to the mailboxes,
+ * semaphores, doorbells etc. that are shared between the ARM and the
+ * VideoCore processor
+ */
+
+#include <linux/device.h>
+#include <linux/dma-mapping.h>
+#include <linux/module.h>
+#include <linux/errno.h>
+#include <linux/fs.h>
+#include <linux/init.h>
+#include <linux/interrupt.h>
+#include <linux/io.h>
+#include <linux/ioctl.h>
+#include <linux/platform_data/mailbox-bcm2708.h>
+#include <linux/platform_device.h>
+#include <linux/uaccess.h>
+
+#define DRIVER_NAME "bcm2708_vcio"
+#define DEVICE_FILE_NAME "vcio"
+
+/* offsets from a mail box base address */
+#define MAIL0_RD	0x00	/* read - and next 4 words */
+#define MAIL0_POL	0x10	/* read without popping the fifo */
+#define MAIL0_SND	0x14	/* sender ID (bottom two bits) */
+#define MAIL0_STA	0x18	/* status */
+#define MAIL0_CNF	0x1C	/* configuration */
+#define MAIL1_WRT	0x20	/* write - and next 4 words */
+#define MAIL1_STA	0x38	/* status */
+
+/* On MACH_BCM270x these come through <linux/interrupt.h> (arm_control.h ) */
+#ifndef ARM_MS_EMPTY
+#define ARM_MS_EMPTY   BIT(30)
+#define ARM_MS_FULL    BIT(31)
+
+#define ARM_MC_IHAVEDATAIRQEN  BIT(0)
+#endif
+
+#define MBOX_MSG(chan, data28)		(((data28) & ~0xf) | ((chan) & 0xf))
+#define MBOX_MSG_LSB(chan, data28)	(((data28) << 4) | ((chan) & 0xf))
+#define MBOX_CHAN(msg)			((msg) & 0xf)
+#define MBOX_DATA28(msg)		((msg) & ~0xf)
+#define MBOX_DATA28_LSB(msg)		(((uint32_t)msg) >> 4)
+
+#define MBOX_MAGIC 0xd0d0c0de
+
+#define MAJOR_NUM 100
+#define IOCTL_MBOX_PROPERTY _IOWR(MAJOR_NUM, 0, char *)
+
+static struct class *vcio_class;
+
+struct vc_mailbox {
+	void __iomem *regs;
+	uint32_t msg[MBOX_CHAN_COUNT];
+	struct semaphore sema[MBOX_CHAN_COUNT];
+	uint32_t magic;
+};
+
+static void mbox_init(struct vc_mailbox *mbox_out)
+{
+	int i;
+
+	for (i = 0; i < MBOX_CHAN_COUNT; i++) {
+		mbox_out->msg[i] = 0;
+		sema_init(&mbox_out->sema[i], 0);
+	}
+
+	/* Enable the interrupt on data reception */
+	writel(ARM_MC_IHAVEDATAIRQEN, mbox_out->regs + MAIL0_CNF);
+
+	mbox_out->magic = MBOX_MAGIC;
+}
+
+static int mbox_write(struct vc_mailbox *mbox, unsigned chan, uint32_t data28)
+{
+	if (mbox->magic != MBOX_MAGIC)
+		return -EINVAL;
+
+	/* wait for the mailbox FIFO to have some space in it */
+	while (0 != (readl(mbox->regs + MAIL1_STA) & ARM_MS_FULL))
+		cpu_relax();
+
+	writel(MBOX_MSG(chan, data28), mbox->regs + MAIL1_WRT);
+
+	return 0;
+}
+
+static int mbox_read(struct vc_mailbox *mbox, unsigned chan, uint32_t *data28)
+{
+	if (mbox->magic != MBOX_MAGIC)
+		return -EINVAL;
+
+	down(&mbox->sema[chan]);
+	*data28 = MBOX_DATA28(mbox->msg[chan]);
+	mbox->msg[chan] = 0;
+
+	return 0;
+}
+
+static irqreturn_t mbox_irq_handler(int irq, void *dev_id)
+{
+	/* wait for the mailbox FIFO to have some data in it */
+	struct vc_mailbox *mbox = (struct vc_mailbox *)dev_id;
+	int status = readl(mbox->regs + MAIL0_STA);
+	int ret = IRQ_NONE;
+
+	while (!(status & ARM_MS_EMPTY)) {
+		uint32_t msg = readl(mbox->regs + MAIL0_RD);
+		int chan = MBOX_CHAN(msg);
+
+		if (chan < MBOX_CHAN_COUNT) {
+			if (mbox->msg[chan]) {
+				pr_err(DRIVER_NAME
+				       ": mbox chan %d overflow - drop %08x\n",
+				       chan, msg);
+			} else {
+				mbox->msg[chan] = (msg | 0xf);
+				up(&mbox->sema[chan]);
+			}
+		} else {
+			pr_err(DRIVER_NAME
+			       ": invalid channel selector (msg %08x)\n", msg);
+		}
+		ret = IRQ_HANDLED;
+		status = readl(mbox->regs + MAIL0_STA);
+	}
+	return ret;
+}
+
+/* Mailbox Methods */
+
+static struct device *mbox_dev;	/* we assume there's only one! */
+
+static int dev_mbox_write(struct device *dev, unsigned chan, uint32_t data28)
+{
+	struct vc_mailbox *mailbox = dev_get_drvdata(dev);
+	int rc;
+
+	device_lock(dev);
+	rc = mbox_write(mailbox, chan, data28);
+	device_unlock(dev);
+
+	return rc;
+}
+
+static int dev_mbox_read(struct device *dev, unsigned chan, uint32_t *data28)
+{
+	struct vc_mailbox *mailbox = dev_get_drvdata(dev);
+	int rc;
+
+	device_lock(dev);
+	rc = mbox_read(mailbox, chan, data28);
+	device_unlock(dev);
+
+	return rc;
+}
+
+extern int bcm_mailbox_write(unsigned chan, uint32_t data28)
+{
+	if (!mbox_dev)
+		return -ENODEV;
+
+	return dev_mbox_write(mbox_dev, chan, data28);
+}
+EXPORT_SYMBOL_GPL(bcm_mailbox_write);
+
+extern int bcm_mailbox_read(unsigned chan, uint32_t *data28)
+{
+	if (!mbox_dev)
+		return -ENODEV;
+
+	return dev_mbox_read(mbox_dev, chan, data28);
+}
+EXPORT_SYMBOL_GPL(bcm_mailbox_read);
+
+static int mbox_copy_from_user(void *dst, const void *src, int size)
+{
+	if ((uint32_t)src < TASK_SIZE)
+		return copy_from_user(dst, src, size);
+
+	memcpy(dst, src, size);
+
+	return 0;
+}
+
+static int mbox_copy_to_user(void *dst, const void *src, int size)
+{
+	if ((uint32_t)dst < TASK_SIZE)
+		return copy_to_user(dst, src, size);
+
+	memcpy(dst, src, size);
+
+	return 0;
+}
+
+static DEFINE_MUTEX(mailbox_lock);
+extern int bcm_mailbox_property(void *data, int size)
+{
+	uint32_t success;
+	dma_addr_t mem_bus; /* the memory address accessed from videocore */
+	void *mem_kern;     /* the memory address accessed from driver */
+	int s = 0;
+
+	mutex_lock(&mailbox_lock);
+	/* allocate some memory for the messages communicating with GPU */
+	mem_kern = dma_alloc_coherent(NULL, PAGE_ALIGN(size), &mem_bus,
+				      GFP_KERNEL);
+	if (mem_kern) {
+		/* create the message */
+		mbox_copy_from_user(mem_kern, data, size);
+
+		/* send the message */
+		wmb();
+		s = bcm_mailbox_write(MBOX_CHAN_PROPERTY, (uint32_t)mem_bus);
+		if (s == 0)
+			s = bcm_mailbox_read(MBOX_CHAN_PROPERTY, &success);
+		if (s == 0) {
+			/* copy the response */
+			rmb();
+			mbox_copy_to_user(data, mem_kern, size);
+		}
+		dma_free_coherent(NULL, PAGE_ALIGN(size), mem_kern, mem_bus);
+	} else {
+		s = -ENOMEM;
+	}
+	if (s != 0)
+		pr_err(DRIVER_NAME ": %s failed (%d)\n", __func__, s);
+
+	mutex_unlock(&mailbox_lock);
+	return s;
+}
+EXPORT_SYMBOL_GPL(bcm_mailbox_property);
+
+/* Platform Device for Mailbox */
+
+/*
+ * Is the device open right now? Used to prevent
+ * concurent access into the same device
+ */
+static bool device_is_open;
+
+/* This is called whenever a process attempts to open the device file */
+static int device_open(struct inode *inode, struct file *file)
+{
+	/* We don't want to talk to two processes at the same time */
+	if (device_is_open)
+		return -EBUSY;
+
+	device_is_open = true;
+	try_module_get(THIS_MODULE);
+
+	return 0;
+}
+
+static int device_release(struct inode *inode, struct file *file)
+{
+	/* We're now ready for our next caller */
+	device_is_open = false;
+
+	module_put(THIS_MODULE);
+
+	return 0;
+}
+
+/*
+ * This function is called whenever a process tries to do an ioctl on our
+ * device file. We get two extra parameters (additional to the inode and file
+ * structures, which all device functions get): the number of the ioctl called
+ * and the parameter given to the ioctl function.
+ *
+ * If the ioctl is write or read/write (meaning output is returned to the
+ * calling process), the ioctl call returns the output of this function.
+ *
+ */
+static long device_ioctl(struct file *file, unsigned int ioctl_num,
+			 unsigned long ioctl_param)
+{
+	unsigned size;
+
+	switch (ioctl_num) {
+	case IOCTL_MBOX_PROPERTY:
+		/*
+		 * Receive a pointer to a message (in user space) and set that
+		 * to be the device's message.  Get the parameter given to
+		 * ioctl by the process.
+		 */
+		mbox_copy_from_user(&size, (void *)ioctl_param, sizeof(size));
+		return bcm_mailbox_property((void *)ioctl_param, size);
+	default:
+		pr_err(DRIVER_NAME "unknown ioctl: %d\n", ioctl_num);
+		return -EINVAL;
+	}
+
+	return 0;
+}
+
+/* Module Declarations */
+
+/*
+ * This structure will hold the functions to be called
+ * when a process does something to the device we
+ * created. Since a pointer to this structure is kept in
+ * the devices table, it can't be local to
+ * init_module. NULL is for unimplemented functios.
+ */
+const struct file_operations fops = {
+	.unlocked_ioctl = device_ioctl,
+	.open = device_open,
+	.release = device_release,	/* a.k.a. close */
+};
+
+static int bcm_vcio_probe(struct platform_device *pdev)
+{
+	struct device *dev = &pdev->dev;
+	struct device *vdev;
+	struct vc_mailbox *mailbox;
+	struct resource *res;
+	int irq, ret;
+
+	mailbox = devm_kzalloc(dev, sizeof(*mailbox), GFP_KERNEL);
+	if (!mailbox)
+		return -ENOMEM;
+
+	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+	mailbox->regs = devm_ioremap_resource(dev, res);
+	if (IS_ERR(mailbox->regs))
+		return PTR_ERR(mailbox->regs);
+
+	irq = platform_get_irq(pdev, 0);
+	ret = devm_request_irq(dev, irq, mbox_irq_handler,
+			       IRQF_IRQPOLL,
+			       dev_name(dev), mailbox);
+	if (ret) {
+		dev_err(dev, "Interrupt request failed %d\n", ret);
+		return ret;
+	}
+
+	ret = register_chrdev(MAJOR_NUM, DEVICE_FILE_NAME, &fops);
+	if (ret < 0) {
+		pr_err("Character device registration failed %d\n", ret);
+		return ret;
+	}
+
+	vcio_class = class_create(THIS_MODULE, DRIVER_NAME);
+	if (IS_ERR(vcio_class)) {
+		ret = PTR_ERR(vcio_class);
+		pr_err("Class creation failed %d\n", ret);
+		goto err_class;
+	}
+
+	vdev = device_create(vcio_class, NULL, MKDEV(MAJOR_NUM, 0), NULL,
+			     "vcio");
+	if (IS_ERR(vdev)) {
+		ret = PTR_ERR(vdev);
+		pr_err("Device creation failed %d\n", ret);
+		goto err_dev;
+	}
+
+	mbox_init(mailbox);
+	platform_set_drvdata(pdev, mailbox);
+	mbox_dev = dev;
+
+	dev_info(dev, "mailbox at %p\n", mailbox->regs);
+
+	return 0;
+
+err_dev:
+	class_destroy(vcio_class);
+err_class:
+	unregister_chrdev(MAJOR_NUM, DEVICE_FILE_NAME);
+
+	return ret;
+}
+
+static int bcm_vcio_remove(struct platform_device *pdev)
+{
+	mbox_dev = NULL;
+	platform_set_drvdata(pdev, NULL);
+	device_destroy(vcio_class, MKDEV(MAJOR_NUM, 0));
+	class_destroy(vcio_class);
+	unregister_chrdev(MAJOR_NUM, DEVICE_FILE_NAME);
+
+	return 0;
+}
+
+static const struct of_device_id bcm_vcio_of_match_table[] = {
+	{ .compatible = "brcm,bcm2708-vcio", },
+	{},
+};
+MODULE_DEVICE_TABLE(of, bcm_vcio_of_match_table);
+
+static struct platform_driver bcm_mbox_driver = {
+	.probe = bcm_vcio_probe,
+	.remove = bcm_vcio_remove,
+
+	.driver = {
+		   .name = DRIVER_NAME,
+		   .owner = THIS_MODULE,
+		   .of_match_table = bcm_vcio_of_match_table,
+		   },
+};
+
+static int __init bcm_mbox_init(void)
+{
+	return platform_driver_register(&bcm_mbox_driver);
+}
+
+static void __exit bcm_mbox_exit(void)
+{
+	platform_driver_unregister(&bcm_mbox_driver);
+}
+
+arch_initcall(bcm_mbox_init);	/* Initialize early */
+module_exit(bcm_mbox_exit);
+
+MODULE_AUTHOR("Gray Girling");
+MODULE_DESCRIPTION("ARM I/O to VideoCore processor");
+MODULE_LICENSE("GPL");
--- /dev/null
+++ b/include/linux/platform_data/mailbox-bcm2708.h
@@ -0,0 +1,126 @@
+/*
+ *  Copyright (C) 2010 Broadcom
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ */
+#ifndef _PLAT_MAILBOX_BCM2708_H
+#define _PLAT_MAILBOX_BCM2708_H
+
+/* Routines to handle I/O via the VideoCore "ARM control" registers
+ * (semaphores, doorbells, mailboxes)
+ */
+
+/* Constants shared with the ARM identifying separate mailbox channels */
+#define MBOX_CHAN_POWER    0 /* for use by the power management interface */
+#define MBOX_CHAN_FB       1 /* for use by the frame buffer */
+#define MBOX_CHAN_VCHIQ    3 /* for use by the VCHIQ interface */
+#define MBOX_CHAN_PROPERTY 8 /* for use by the property channel */
+#define MBOX_CHAN_COUNT    9
+
+enum {
+	VCMSG_PROCESS_REQUEST		= 0x00000000
+};
+
+enum {
+	VCMSG_REQUEST_SUCCESSFUL	= 0x80000000,
+	VCMSG_REQUEST_FAILED		= 0x80000001
+};
+
+/* Mailbox property tags */
+enum {
+	VCMSG_PROPERTY_END               = 0x00000000,
+	VCMSG_GET_FIRMWARE_REVISION      = 0x00000001,
+	VCMSG_GET_BOARD_MODEL            = 0x00010001,
+	VCMSG_GET_BOARD_REVISION	 = 0x00010002,
+	VCMSG_GET_BOARD_MAC_ADDRESS	 = 0x00010003,
+	VCMSG_GET_BOARD_SERIAL		 = 0x00010004,
+	VCMSG_GET_ARM_MEMORY		 = 0x00010005,
+	VCMSG_GET_VC_MEMORY		 = 0x00010006,
+	VCMSG_GET_CLOCKS		 = 0x00010007,
+	VCMSG_GET_COMMAND_LINE           = 0x00050001,
+	VCMSG_GET_DMA_CHANNELS           = 0x00060001,
+	VCMSG_GET_POWER_STATE            = 0x00020001,
+	VCMSG_GET_TIMING		 = 0x00020002,
+	VCMSG_SET_POWER_STATE            = 0x00028001,
+	VCMSG_GET_CLOCK_STATE            = 0x00030001,
+	VCMSG_SET_CLOCK_STATE            = 0x00038001,
+	VCMSG_GET_CLOCK_RATE             = 0x00030002,
+	VCMSG_SET_CLOCK_RATE             = 0x00038002,
+	VCMSG_GET_VOLTAGE                = 0x00030003,
+	VCMSG_SET_VOLTAGE                = 0x00038003,
+	VCMSG_GET_MAX_CLOCK              = 0x00030004,
+	VCMSG_GET_MAX_VOLTAGE            = 0x00030005,
+	VCMSG_GET_TEMPERATURE            = 0x00030006,
+	VCMSG_GET_MIN_CLOCK              = 0x00030007,
+	VCMSG_GET_MIN_VOLTAGE            = 0x00030008,
+	VCMSG_GET_TURBO                  = 0x00030009,
+	VCMSG_GET_MAX_TEMPERATURE        = 0x0003000a,
+	VCMSG_GET_STC                    = 0x0003000b,
+	VCMSG_SET_TURBO                  = 0x00038009,
+	VCMSG_SET_ALLOCATE_MEM           = 0x0003000c,
+	VCMSG_SET_LOCK_MEM               = 0x0003000d,
+	VCMSG_SET_UNLOCK_MEM             = 0x0003000e,
+	VCMSG_SET_RELEASE_MEM            = 0x0003000f,
+	VCMSG_SET_EXECUTE_CODE           = 0x00030010,
+	VCMSG_SET_EXECUTE_QPU            = 0x00030011,
+	VCMSG_SET_ENABLE_QPU             = 0x00030012,
+	VCMSG_GET_RESOURCE_HANDLE        = 0x00030014,
+	VCMSG_GET_EDID_BLOCK             = 0x00030020,
+	VCMSG_GET_CUSTOMER_OTP           = 0x00030021,
+	VCMSG_SET_CUSTOMER_OTP           = 0x00038021,
+	VCMSG_SET_ALLOCATE_BUFFER        = 0x00040001,
+	VCMSG_SET_RELEASE_BUFFER         = 0x00048001,
+	VCMSG_SET_BLANK_SCREEN           = 0x00040002,
+	VCMSG_TST_BLANK_SCREEN           = 0x00044002,
+	VCMSG_GET_PHYSICAL_WIDTH_HEIGHT  = 0x00040003,
+	VCMSG_TST_PHYSICAL_WIDTH_HEIGHT  = 0x00044003,
+	VCMSG_SET_PHYSICAL_WIDTH_HEIGHT  = 0x00048003,
+	VCMSG_GET_VIRTUAL_WIDTH_HEIGHT   = 0x00040004,
+	VCMSG_TST_VIRTUAL_WIDTH_HEIGHT   = 0x00044004,
+	VCMSG_SET_VIRTUAL_WIDTH_HEIGHT   = 0x00048004,
+	VCMSG_GET_DEPTH                  = 0x00040005,
+	VCMSG_TST_DEPTH                  = 0x00044005,
+	VCMSG_SET_DEPTH                  = 0x00048005,
+	VCMSG_GET_PIXEL_ORDER            = 0x00040006,
+	VCMSG_TST_PIXEL_ORDER            = 0x00044006,
+	VCMSG_SET_PIXEL_ORDER            = 0x00048006,
+	VCMSG_GET_ALPHA_MODE             = 0x00040007,
+	VCMSG_TST_ALPHA_MODE             = 0x00044007,
+	VCMSG_SET_ALPHA_MODE             = 0x00048007,
+	VCMSG_GET_PITCH                  = 0x00040008,
+	VCMSG_TST_PITCH                  = 0x00044008,
+	VCMSG_SET_PITCH                  = 0x00048008,
+	VCMSG_GET_VIRTUAL_OFFSET         = 0x00040009,
+	VCMSG_TST_VIRTUAL_OFFSET         = 0x00044009,
+	VCMSG_SET_VIRTUAL_OFFSET         = 0x00048009,
+	VCMSG_GET_OVERSCAN               = 0x0004000a,
+	VCMSG_TST_OVERSCAN               = 0x0004400a,
+	VCMSG_SET_OVERSCAN               = 0x0004800a,
+	VCMSG_GET_PALETTE                = 0x0004000b,
+	VCMSG_TST_PALETTE                = 0x0004400b,
+	VCMSG_SET_PALETTE                = 0x0004800b,
+	VCMSG_GET_LAYER                  = 0x0004000c,
+	VCMSG_TST_LAYER                  = 0x0004400c,
+	VCMSG_SET_LAYER                  = 0x0004800c,
+	VCMSG_GET_TRANSFORM              = 0x0004000d,
+	VCMSG_TST_TRANSFORM              = 0x0004400d,
+	VCMSG_SET_TRANSFORM              = 0x0004800d,
+	VCMSG_TST_VSYNC                  = 0x0004400e,
+	VCMSG_SET_VSYNC                  = 0x0004800e,
+	VCMSG_SET_CURSOR_INFO            = 0x00008010,
+	VCMSG_SET_CURSOR_STATE           = 0x00008011,
+};
+
+int bcm_mailbox_read(unsigned chan, uint32_t *data28);
+int bcm_mailbox_write(unsigned chan, uint32_t data28);
+int bcm_mailbox_property(void *data, int size);
+
+#endif