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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
Content-Transfer-Encoding: 8bit
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
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