brcm2708: add linux 4.1 support

Signed-off-by: Álvaro Fernández Rojas <noltari@gmail.com>

SVN-Revision: 46399

1 files changed, 1308 insertions, 0 deletions

diff --git a/target/linux/brcm2708/patches-4.1/0010-cma-Add-vc_cma-driver-to-enable-use-of-CMA.patch b/target/linux/brcm2708/patches-4.1/0010-cma-Add-vc_cma-driver-to-enable-use-of-CMA.patch
new file mode 100644
index 0000000000..469ddd6251
--- /dev/null
+++ b/target/linux/brcm2708/patches-4.1/0010-cma-Add-vc_cma-driver-to-enable-use-of-CMA.patch
@@ -0,0 +1,1308 @@
+From 2bb9c01de4c90a8b7a9b52be95f504177abeaf45 Mon Sep 17 00:00:00 2001
+From: popcornmix <popcornmix@gmail.com>
+Date: Wed, 3 Jul 2013 00:31:47 +0100
+Subject: [PATCH 010/121] cma: Add vc_cma driver to enable use of CMA
+
+Signed-off-by: popcornmix <popcornmix@gmail.com>
+
+vc_cma: Make the vc_cma area the default contiguous DMA area
+---
+ drivers/char/Kconfig                  |    2 +
+ drivers/char/Makefile                 |    1 +
+ drivers/char/broadcom/Kconfig         |   15 +
+ drivers/char/broadcom/Makefile        |    1 +
+ drivers/char/broadcom/vc_cma/Makefile |   14 +
+ drivers/char/broadcom/vc_cma/vc_cma.c | 1193 +++++++++++++++++++++++++++++++++
+ include/linux/broadcom/vc_cma.h       |   29 +
+ 7 files changed, 1255 insertions(+)
+ create mode 100644 drivers/char/broadcom/Kconfig
+ create mode 100644 drivers/char/broadcom/Makefile
+ create mode 100644 drivers/char/broadcom/vc_cma/Makefile
+ create mode 100644 drivers/char/broadcom/vc_cma/vc_cma.c
+ create mode 100644 include/linux/broadcom/vc_cma.h
+
+--- a/drivers/char/Kconfig
++++ b/drivers/char/Kconfig
+@@ -590,6 +590,8 @@ config DEVPORT
+ 
+ source "drivers/s390/char/Kconfig"
+ 
++source "drivers/char/broadcom/Kconfig"
++
+ config MSM_SMD_PKT
+ 	bool "Enable device interface for some SMD packet ports"
+ 	default n
+--- a/drivers/char/Makefile
++++ b/drivers/char/Makefile
+@@ -62,3 +62,4 @@ js-rtc-y = rtc.o
+ 
+ obj-$(CONFIG_TILE_SROM)		+= tile-srom.o
+ obj-$(CONFIG_XILLYBUS)		+= xillybus/
++obj-$(CONFIG_BRCM_CHAR_DRIVERS) += broadcom/
+--- /dev/null
++++ b/drivers/char/broadcom/Kconfig
+@@ -0,0 +1,15 @@
++#
++# Broadcom char driver config
++#
++
++menuconfig BRCM_CHAR_DRIVERS
++	bool "Broadcom Char Drivers"
++	help
++	  Broadcom's char drivers
++
++config BCM_VC_CMA
++	bool "Videocore CMA"
++	depends on CMA && BRCM_CHAR_DRIVERS && BCM2708_VCHIQ
++	default n
++        help
++          Helper for videocore CMA access.
+--- /dev/null
++++ b/drivers/char/broadcom/Makefile
+@@ -0,0 +1 @@
++obj-$(CONFIG_BCM_VC_CMA)	+= vc_cma/
+--- /dev/null
++++ b/drivers/char/broadcom/vc_cma/Makefile
+@@ -0,0 +1,14 @@
++ccflags-y  += -Wall -Wstrict-prototypes -Wno-trigraphs
++ccflags-y  += -Werror
++ccflags-y  += -Iinclude/linux/broadcom
++ccflags-y  += -Idrivers/misc/vc04_services
++ccflags-y  += -Idrivers/misc/vc04_services/interface/vchi
++ccflags-y  += -Idrivers/misc/vc04_services/interface/vchiq_arm
++
++ccflags-y  += -D__KERNEL__
++ccflags-y  += -D__linux__
++ccflags-y  += -Werror
++
++obj-$(CONFIG_BCM_VC_CMA) += vc-cma.o
++
++vc-cma-objs := vc_cma.o
+--- /dev/null
++++ b/drivers/char/broadcom/vc_cma/vc_cma.c
+@@ -0,0 +1,1193 @@
++/**
++ * Copyright (c) 2010-2012 Broadcom. 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,
++ *    without modification.
++ * 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.
++ * 3. The names of the above-listed copyright holders may not be used
++ *    to endorse or promote products derived from this software without
++ *    specific prior written permission.
++ *
++ * ALTERNATIVELY, this software may be distributed under the terms of the
++ * GNU General Public License ("GPL") version 2, as published by the Free
++ * Software Foundation.
++ *
++ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS 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 COPYRIGHT OWNER 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.
++ */
++
++#include <linux/kernel.h>
++#include <linux/module.h>
++#include <linux/kthread.h>
++#include <linux/fs.h>
++#include <linux/device.h>
++#include <linux/cdev.h>
++#include <linux/mm.h>
++#include <linux/proc_fs.h>
++#include <linux/seq_file.h>
++#include <linux/dma-mapping.h>
++#include <linux/dma-contiguous.h>
++#include <linux/platform_device.h>
++#include <linux/uaccess.h>
++#include <asm/cacheflush.h>
++
++#include "vc_cma.h"
++
++#include "vchiq_util.h"
++#include "vchiq_connected.h"
++//#include "debug_sym.h"
++//#include "vc_mem.h"
++
++#define DRIVER_NAME  "vc-cma"
++
++#define LOG_DBG(fmt, ...) \
++	if (vc_cma_debug) \
++		printk(KERN_INFO fmt "\n", ##__VA_ARGS__)
++#define LOG_INFO(fmt, ...) \
++	printk(KERN_INFO fmt "\n", ##__VA_ARGS__)
++#define LOG_ERR(fmt, ...) \
++	printk(KERN_ERR fmt "\n", ##__VA_ARGS__)
++
++#define VC_CMA_FOURCC VCHIQ_MAKE_FOURCC('C', 'M', 'A', ' ')
++#define VC_CMA_VERSION 2
++
++#define VC_CMA_CHUNK_ORDER 6	/* 256K */
++#define VC_CMA_CHUNK_SIZE (4096 << VC_CMA_CHUNK_ORDER)
++#define VC_CMA_MAX_PARAMS_PER_MSG \
++	((VCHIQ_MAX_MSG_SIZE - sizeof(unsigned short))/sizeof(unsigned short))
++#define VC_CMA_RESERVE_COUNT_MAX 16
++
++#define PAGES_PER_CHUNK (VC_CMA_CHUNK_SIZE / PAGE_SIZE)
++
++#define VCADDR_TO_PHYSADDR(vcaddr) (mm_vc_mem_phys_addr + vcaddr)
++
++#define loud_error(...) \
++	LOG_ERR("===== " __VA_ARGS__)
++
++enum {
++	VC_CMA_MSG_QUIT,
++	VC_CMA_MSG_OPEN,
++	VC_CMA_MSG_TICK,
++	VC_CMA_MSG_ALLOC,	/* chunk count */
++	VC_CMA_MSG_FREE,	/* chunk, chunk, ... */
++	VC_CMA_MSG_ALLOCATED,	/* chunk, chunk, ... */
++	VC_CMA_MSG_REQUEST_ALLOC,	/* chunk count */
++	VC_CMA_MSG_REQUEST_FREE,	/* chunk count */
++	VC_CMA_MSG_RESERVE,	/* bytes lo, bytes hi */
++	VC_CMA_MSG_UPDATE_RESERVE,
++	VC_CMA_MSG_MAX
++};
++
++struct cma_msg {
++	unsigned short type;
++	unsigned short params[VC_CMA_MAX_PARAMS_PER_MSG];
++};
++
++struct vc_cma_reserve_user {
++	unsigned int pid;
++	unsigned int reserve;
++};
++
++/* Device (/dev) related variables */
++static dev_t vc_cma_devnum;
++static struct class *vc_cma_class;
++static struct cdev vc_cma_cdev;
++static int vc_cma_inited;
++static int vc_cma_debug;
++
++/* Proc entry */
++static struct proc_dir_entry *vc_cma_proc_entry;
++
++phys_addr_t vc_cma_base;
++struct page *vc_cma_base_page;
++unsigned int vc_cma_size;
++EXPORT_SYMBOL(vc_cma_size);
++unsigned int vc_cma_initial;
++unsigned int vc_cma_chunks;
++unsigned int vc_cma_chunks_used;
++unsigned int vc_cma_chunks_reserved;
++
++
++void *vc_cma_dma_alloc;
++unsigned int vc_cma_dma_size;
++
++static int in_loud_error;
++
++unsigned int vc_cma_reserve_total;
++unsigned int vc_cma_reserve_count;
++struct vc_cma_reserve_user vc_cma_reserve_users[VC_CMA_RESERVE_COUNT_MAX];
++static DEFINE_SEMAPHORE(vc_cma_reserve_mutex);
++static DEFINE_SEMAPHORE(vc_cma_worker_queue_push_mutex);
++
++static u64 vc_cma_dma_mask = DMA_BIT_MASK(32);
++static struct platform_device vc_cma_device = {
++	.name = "vc-cma",
++	.id = 0,
++	.dev = {
++		.dma_mask = &vc_cma_dma_mask,
++		.coherent_dma_mask = DMA_BIT_MASK(32),
++		},
++};
++
++static VCHIQ_INSTANCE_T cma_instance;
++static VCHIQ_SERVICE_HANDLE_T cma_service;
++static VCHIU_QUEUE_T cma_msg_queue;
++static struct task_struct *cma_worker;
++
++static int vc_cma_set_reserve(unsigned int reserve, unsigned int pid);
++static int vc_cma_alloc_chunks(int num_chunks, struct cma_msg *reply);
++static VCHIQ_STATUS_T cma_service_callback(VCHIQ_REASON_T reason,
++					   VCHIQ_HEADER_T * header,
++					   VCHIQ_SERVICE_HANDLE_T service,
++					   void *bulk_userdata);
++static void send_vc_msg(unsigned short type,
++			unsigned short param1, unsigned short param2);
++static bool send_worker_msg(VCHIQ_HEADER_T * msg);
++
++static int early_vc_cma_mem(char *p)
++{
++	unsigned int new_size;
++	printk(KERN_NOTICE "early_vc_cma_mem(%s)", p);
++	vc_cma_size = memparse(p, &p);
++	vc_cma_initial = vc_cma_size;
++	if (*p == '/')
++		vc_cma_size = memparse(p + 1, &p);
++	if (*p == '@')
++		vc_cma_base = memparse(p + 1, &p);
++
++	new_size = (vc_cma_size - ((-vc_cma_base) & (VC_CMA_CHUNK_SIZE - 1)))
++	    & ~(VC_CMA_CHUNK_SIZE - 1);
++	if (new_size > vc_cma_size)
++		vc_cma_size = 0;
++	vc_cma_initial = (vc_cma_initial + VC_CMA_CHUNK_SIZE - 1)
++	    & ~(VC_CMA_CHUNK_SIZE - 1);
++	if (vc_cma_initial > vc_cma_size)
++		vc_cma_initial = vc_cma_size;
++	vc_cma_base = (vc_cma_base + VC_CMA_CHUNK_SIZE - 1)
++	    & ~(VC_CMA_CHUNK_SIZE - 1);
++
++	printk(KERN_NOTICE " -> initial %x, size %x, base %x", vc_cma_initial,
++	       vc_cma_size, (unsigned int)vc_cma_base);
++
++	return 0;
++}
++
++early_param("vc-cma-mem", early_vc_cma_mem);
++
++void vc_cma_early_init(void)
++{
++	LOG_DBG("vc_cma_early_init - vc_cma_chunks = %d", vc_cma_chunks);
++	if (vc_cma_size) {
++		int rc = platform_device_register(&vc_cma_device);
++		LOG_DBG("platform_device_register -> %d", rc);
++	}
++}
++
++void vc_cma_reserve(void)
++{
++	/* if vc_cma_size is set, then declare vc CMA area of the same
++	 * size from the end of memory
++	 */
++	if (vc_cma_size) {
++		if (dma_declare_contiguous(&vc_cma_device.dev, vc_cma_size,
++					   vc_cma_base, 0) == 0) {
++			if (!dev_get_cma_area(NULL)) {
++				/* There is no default CMA area - make this
++				   the default */
++				struct cma *vc_cma_area = dev_get_cma_area(
++					&vc_cma_device.dev);
++				dma_contiguous_set_default(vc_cma_area);
++				LOG_INFO("vc_cma_reserve - using vc_cma as "
++					 "the default contiguous DMA area");
++			}
++		} else {
++			LOG_ERR("vc_cma: dma_declare_contiguous(%x,%x) failed",
++				vc_cma_size, (unsigned int)vc_cma_base);
++			vc_cma_size = 0;
++		}
++	}
++	vc_cma_chunks = vc_cma_size / VC_CMA_CHUNK_SIZE;
++}
++
++/****************************************************************************
++*
++*   vc_cma_open
++*
++***************************************************************************/
++
++static int vc_cma_open(struct inode *inode, struct file *file)
++{
++	(void)inode;
++	(void)file;
++
++	return 0;
++}
++
++/****************************************************************************
++*
++*   vc_cma_release
++*
++***************************************************************************/
++
++static int vc_cma_release(struct inode *inode, struct file *file)
++{
++	(void)inode;
++	(void)file;
++
++	vc_cma_set_reserve(0, current->tgid);
++
++	return 0;
++}
++
++/****************************************************************************
++*
++*   vc_cma_ioctl
++*
++***************************************************************************/
++
++static long vc_cma_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
++{
++	int rc = 0;
++
++	(void)cmd;
++	(void)arg;
++
++	switch (cmd) {
++	case VC_CMA_IOC_RESERVE:
++		rc = vc_cma_set_reserve((unsigned int)arg, current->tgid);
++		if (rc >= 0)
++			rc = 0;
++		break;
++	default:
++		LOG_ERR("vc-cma: Unknown ioctl %x", cmd);
++		return -ENOTTY;
++	}
++
++	return rc;
++}
++
++/****************************************************************************
++*
++*   File Operations for the driver.
++*
++***************************************************************************/
++
++static const struct file_operations vc_cma_fops = {
++	.owner = THIS_MODULE,
++	.open = vc_cma_open,
++	.release = vc_cma_release,
++	.unlocked_ioctl = vc_cma_ioctl,
++};
++
++/****************************************************************************
++*
++*   vc_cma_proc_open
++*
++***************************************************************************/
++
++static int vc_cma_show_info(struct seq_file *m, void *v)
++{
++	int i;
++
++	seq_printf(m, "Videocore CMA:\n");
++	seq_printf(m, "   Base       : %08x\n", (unsigned int)vc_cma_base);
++	seq_printf(m, "   Length     : %08x\n", vc_cma_size);
++	seq_printf(m, "   Initial    : %08x\n", vc_cma_initial);
++	seq_printf(m, "   Chunk size : %08x\n", VC_CMA_CHUNK_SIZE);
++	seq_printf(m, "   Chunks     : %4d (%d bytes)\n",
++		   (int)vc_cma_chunks,
++		   (int)(vc_cma_chunks * VC_CMA_CHUNK_SIZE));
++	seq_printf(m, "   Used       : %4d (%d bytes)\n",
++		   (int)vc_cma_chunks_used,
++		   (int)(vc_cma_chunks_used * VC_CMA_CHUNK_SIZE));
++	seq_printf(m, "   Reserved   : %4d (%d bytes)\n",
++		   (unsigned int)vc_cma_chunks_reserved,
++		   (int)(vc_cma_chunks_reserved * VC_CMA_CHUNK_SIZE));
++
++	for (i = 0; i < vc_cma_reserve_count; i++) {
++		struct vc_cma_reserve_user *user = &vc_cma_reserve_users[i];
++		seq_printf(m, "     PID %5d: %d bytes\n", user->pid,
++			   user->reserve);
++	}
++	seq_printf(m, "   dma_alloc  : %p (%d pages)\n",
++		   vc_cma_dma_alloc ? page_address(vc_cma_dma_alloc) : 0,
++		   vc_cma_dma_size);
++
++	seq_printf(m, "\n");
++
++	return 0;
++}
++
++static int vc_cma_proc_open(struct inode *inode, struct file *file)
++{
++	return single_open(file, vc_cma_show_info, NULL);
++}
++
++/****************************************************************************
++*
++*   vc_cma_proc_write
++*
++***************************************************************************/
++
++static int vc_cma_proc_write(struct file *file,
++			     const char __user *buffer,
++			     size_t size, loff_t *ppos)
++{
++	int rc = -EFAULT;
++	char input_str[20];
++
++	memset(input_str, 0, sizeof(input_str));
++
++	if (size > sizeof(input_str)) {
++		LOG_ERR("%s: input string length too long", __func__);
++		goto out;
++	}
++
++	if (copy_from_user(input_str, buffer, size - 1)) {
++		LOG_ERR("%s: failed to get input string", __func__);
++		goto out;
++	}
++#define ALLOC_STR "alloc"
++#define FREE_STR "free"
++#define DEBUG_STR "debug"
++#define RESERVE_STR "reserve"
++#define DMA_ALLOC_STR "dma_alloc"
++#define DMA_FREE_STR "dma_free"
++	if (strncmp(input_str, ALLOC_STR, strlen(ALLOC_STR)) == 0) {
++		int alloc_size;
++		char *p = input_str + strlen(ALLOC_STR);
++
++		while (*p == ' ')
++			p++;
++		alloc_size = memparse(p, NULL);
++		LOG_INFO("/proc/vc-cma: alloc %d", alloc_size);
++		if (alloc_size)
++			send_vc_msg(VC_CMA_MSG_REQUEST_FREE,
++				    alloc_size / VC_CMA_CHUNK_SIZE, 0);
++		else
++			LOG_ERR("invalid size '%s'", p);
++		rc = size;
++	} else if (strncmp(input_str, FREE_STR, strlen(FREE_STR)) == 0) {
++		int alloc_size;
++		char *p = input_str + strlen(FREE_STR);
++
++		while (*p == ' ')
++			p++;
++		alloc_size = memparse(p, NULL);
++		LOG_INFO("/proc/vc-cma: free %d", alloc_size);
++		if (alloc_size)
++			send_vc_msg(VC_CMA_MSG_REQUEST_ALLOC,
++				    alloc_size / VC_CMA_CHUNK_SIZE, 0);
++		else
++			LOG_ERR("invalid size '%s'", p);
++		rc = size;
++	} else if (strncmp(input_str, DEBUG_STR, strlen(DEBUG_STR)) == 0) {
++		char *p = input_str + strlen(DEBUG_STR);
++		while (*p == ' ')
++			p++;
++		if ((strcmp(p, "on") == 0) || (strcmp(p, "1") == 0))
++			vc_cma_debug = 1;
++		else if ((strcmp(p, "off") == 0) || (strcmp(p, "0") == 0))
++			vc_cma_debug = 0;
++		LOG_INFO("/proc/vc-cma: debug %s", vc_cma_debug ? "on" : "off");
++		rc = size;
++	} else if (strncmp(input_str, RESERVE_STR, strlen(RESERVE_STR)) == 0) {
++		int alloc_size;
++		int reserved;
++		char *p = input_str + strlen(RESERVE_STR);
++		while (*p == ' ')
++			p++;
++		alloc_size = memparse(p, NULL);
++
++		reserved = vc_cma_set_reserve(alloc_size, current->tgid);
++		rc = (reserved >= 0) ? size : reserved;
++	} else if (strncmp(input_str, DMA_ALLOC_STR, strlen(DMA_ALLOC_STR)) == 0) {
++		int alloc_size;
++		char *p = input_str + strlen(DMA_ALLOC_STR);
++		while (*p == ' ')
++			p++;
++		alloc_size = memparse(p, NULL);
++
++		if (vc_cma_dma_alloc) {
++		    dma_release_from_contiguous(NULL, vc_cma_dma_alloc,
++						vc_cma_dma_size);
++		    vc_cma_dma_alloc = NULL;
++		    vc_cma_dma_size = 0;
++		}
++		vc_cma_dma_alloc = dma_alloc_from_contiguous(NULL, alloc_size, 0);
++		vc_cma_dma_size = (vc_cma_dma_alloc ? alloc_size : 0);
++		if (vc_cma_dma_alloc)
++			LOG_INFO("dma_alloc(%d pages) -> %p", alloc_size, page_address(vc_cma_dma_alloc));
++		else
++			LOG_ERR("dma_alloc(%d pages) failed", alloc_size);
++		rc = size;
++	} else if (strncmp(input_str, DMA_FREE_STR, strlen(DMA_FREE_STR)) == 0) {
++		if (vc_cma_dma_alloc) {
++		    dma_release_from_contiguous(NULL, vc_cma_dma_alloc,
++						vc_cma_dma_size);
++		    vc_cma_dma_alloc = NULL;
++		    vc_cma_dma_size = 0;
++		}
++		rc = size;
++	}
++
++out:
++	return rc;
++}
++
++/****************************************************************************
++*
++*   File Operations for /proc interface.
++*
++***************************************************************************/
++
++static const struct file_operations vc_cma_proc_fops = {
++	.open = vc_cma_proc_open,
++	.read = seq_read,
++	.write = vc_cma_proc_write,
++	.llseek = seq_lseek,
++	.release = single_release
++};
++
++static int vc_cma_set_reserve(unsigned int reserve, unsigned int pid)
++{
++	struct vc_cma_reserve_user *user = NULL;
++	int delta = 0;
++	int i;
++
++	if (down_interruptible(&vc_cma_reserve_mutex))
++		return -ERESTARTSYS;
++
++	for (i = 0; i < vc_cma_reserve_count; i++) {
++		if (pid == vc_cma_reserve_users[i].pid) {
++			user = &vc_cma_reserve_users[i];
++			delta = reserve - user->reserve;
++			if (reserve)
++				user->reserve = reserve;
++			else {
++				/* Remove this entry by copying downwards */
++				while ((i + 1) < vc_cma_reserve_count) {
++					user[0].pid = user[1].pid;
++					user[0].reserve = user[1].reserve;
++					user++;
++					i++;
++				}
++				vc_cma_reserve_count--;
++				user = NULL;
++			}
++			break;
++		}
++	}
++
++	if (reserve && !user) {
++		if (vc_cma_reserve_count == VC_CMA_RESERVE_COUNT_MAX) {
++			LOG_ERR("vc-cma: Too many reservations - "
++				"increase CMA_RESERVE_COUNT_MAX");
++			up(&vc_cma_reserve_mutex);
++			return -EBUSY;
++		}
++		user = &vc_cma_reserve_users[vc_cma_reserve_count];
++		user->pid = pid;
++		user->reserve = reserve;
++		delta = reserve;
++		vc_cma_reserve_count++;
++	}
++
++	vc_cma_reserve_total += delta;
++
++	send_vc_msg(VC_CMA_MSG_RESERVE,
++		    vc_cma_reserve_total & 0xffff, vc_cma_reserve_total >> 16);
++
++	send_worker_msg((VCHIQ_HEADER_T *) VC_CMA_MSG_UPDATE_RESERVE);
++
++	LOG_DBG("/proc/vc-cma: reserve %d (PID %d) - total %u",
++		reserve, pid, vc_cma_reserve_total);
++
++	up(&vc_cma_reserve_mutex);
++
++	return vc_cma_reserve_total;
++}
++
++static VCHIQ_STATUS_T cma_service_callback(VCHIQ_REASON_T reason,
++					   VCHIQ_HEADER_T * header,
++					   VCHIQ_SERVICE_HANDLE_T service,
++					   void *bulk_userdata)
++{
++	switch (reason) {
++	case VCHIQ_MESSAGE_AVAILABLE:
++		if (!send_worker_msg(header))
++			return VCHIQ_RETRY;
++		break;
++	case VCHIQ_SERVICE_CLOSED:
++		LOG_DBG("CMA service closed");
++		break;
++	default:
++		LOG_ERR("Unexpected CMA callback reason %d", reason);
++		break;
++	}
++	return VCHIQ_SUCCESS;
++}
++
++static void send_vc_msg(unsigned short type,
++			unsigned short param1, unsigned short param2)
++{
++	unsigned short msg[] = { type, param1, param2 };
++	VCHIQ_ELEMENT_T elem = { &msg, sizeof(msg) };
++	VCHIQ_STATUS_T ret;
++	vchiq_use_service(cma_service);
++	ret = vchiq_queue_message(cma_service, &elem, 1);
++	vchiq_release_service(cma_service);
++	if (ret != VCHIQ_SUCCESS)
++		LOG_ERR("vchiq_queue_message returned %x", ret);
++}
++
++static bool send_worker_msg(VCHIQ_HEADER_T * msg)
++{
++	if (down_interruptible(&vc_cma_worker_queue_push_mutex))
++		return false;
++	vchiu_queue_push(&cma_msg_queue, msg);
++	up(&vc_cma_worker_queue_push_mutex);
++	return true;
++}
++
++static int vc_cma_alloc_chunks(int num_chunks, struct cma_msg *reply)
++{
++	int i;
++	for (i = 0; i < num_chunks; i++) {
++		struct page *chunk;
++		unsigned int chunk_num;
++		uint8_t *chunk_addr;
++		size_t chunk_size = PAGES_PER_CHUNK << PAGE_SHIFT;
++
++		chunk = dma_alloc_from_contiguous(&vc_cma_device.dev,
++						  PAGES_PER_CHUNK,
++						  VC_CMA_CHUNK_ORDER);
++		if (!chunk)
++			break;
++
++		chunk_addr = page_address(chunk);
++		dmac_flush_range(chunk_addr, chunk_addr + chunk_size);
++		outer_inv_range(__pa(chunk_addr), __pa(chunk_addr) +
++			chunk_size);
++
++		chunk_num =
++		    (page_to_phys(chunk) - vc_cma_base) / VC_CMA_CHUNK_SIZE;
++		BUG_ON(((page_to_phys(chunk) - vc_cma_base) %
++			VC_CMA_CHUNK_SIZE) != 0);
++		if (chunk_num >= vc_cma_chunks) {
++			phys_addr_t _pa = vc_cma_base + vc_cma_size - 1;
++			LOG_ERR("%s: ===============================",
++				__func__);
++			LOG_ERR("%s: chunk phys %x, vc_cma %pa-%pa - "
++				"bad SPARSEMEM configuration?",
++				__func__, (unsigned int)page_to_phys(chunk),
++				&vc_cma_base, &_pa);
++			LOG_ERR("%s: dev->cma_area = %p", __func__,
++				(void*)0/*vc_cma_device.dev.cma_area*/);
++			LOG_ERR("%s: ===============================",
++				__func__);
++			break;
++		}
++		reply->params[i] = chunk_num;
++		vc_cma_chunks_used++;
++	}
++
++	if (i < num_chunks) {
++		LOG_ERR("%s: dma_alloc_from_contiguous failed "
++			"for %x bytes (alloc %d of %d, %d free)",
++			__func__, VC_CMA_CHUNK_SIZE, i,
++			num_chunks, vc_cma_chunks - vc_cma_chunks_used);
++		num_chunks = i;
++	}
++
++	LOG_DBG("CMA allocated %d chunks -> %d used",
++		num_chunks, vc_cma_chunks_used);
++	reply->type = VC_CMA_MSG_ALLOCATED;
++
++	{
++		VCHIQ_ELEMENT_T elem = {
++			reply,
++			offsetof(struct cma_msg, params[0]) +
++			    num_chunks * sizeof(reply->params[0])
++		};
++		VCHIQ_STATUS_T ret;
++		vchiq_use_service(cma_service);
++		ret = vchiq_queue_message(cma_service, &elem, 1);
++		vchiq_release_service(cma_service);
++		if (ret != VCHIQ_SUCCESS)
++			LOG_ERR("vchiq_queue_message return " "%x", ret);
++	}
++
++	return num_chunks;
++}
++
++static int cma_worker_proc(void *param)
++{
++	static struct cma_msg reply;
++	(void)param;
++
++	while (1) {
++		VCHIQ_HEADER_T *msg;
++		static struct cma_msg msg_copy;
++		struct cma_msg *cma_msg = &msg_copy;
++		int type, msg_size;
++
++		msg = vchiu_queue_pop(&cma_msg_queue);
++		if ((unsigned int)msg >= VC_CMA_MSG_MAX) {
++			msg_size = msg->size;
++			memcpy(&msg_copy, msg->data, msg_size);
++			type = cma_msg->type;
++			vchiq_release_message(cma_service, msg);
++		} else {
++			msg_size = 0;
++			type = (int)msg;
++			if (type == VC_CMA_MSG_QUIT)
++				break;
++			else if (type == VC_CMA_MSG_UPDATE_RESERVE) {
++				msg = NULL;
++				cma_msg = NULL;
++			} else {
++				BUG();
++				continue;
++			}
++		}
++
++		switch (type) {
++		case VC_CMA_MSG_ALLOC:{
++				int num_chunks, free_chunks;
++				num_chunks = cma_msg->params[0];
++				free_chunks =
++				    vc_cma_chunks - vc_cma_chunks_used;
++				LOG_DBG("CMA_MSG_ALLOC(%d chunks)", num_chunks);
++				if (num_chunks > VC_CMA_MAX_PARAMS_PER_MSG) {
++					LOG_ERR
++					    ("CMA_MSG_ALLOC - chunk count (%d) "
++					     "exceeds VC_CMA_MAX_PARAMS_PER_MSG (%d)",
++					     num_chunks,
++					     VC_CMA_MAX_PARAMS_PER_MSG);
++					num_chunks = VC_CMA_MAX_PARAMS_PER_MSG;
++				}
++
++				if (num_chunks > free_chunks) {
++					LOG_ERR
++					    ("CMA_MSG_ALLOC - chunk count (%d) "
++					     "exceeds free chunks (%d)",
++					     num_chunks, free_chunks);
++					num_chunks = free_chunks;
++				}
++
++				vc_cma_alloc_chunks(num_chunks, &reply);
++			}
++			break;
++
++		case VC_CMA_MSG_FREE:{
++				int chunk_count =
++				    (msg_size -
++				     offsetof(struct cma_msg,
++					      params)) /
++				    sizeof(cma_msg->params[0]);
++				int i;
++				BUG_ON(chunk_count <= 0);
++
++				LOG_DBG("CMA_MSG_FREE(%d chunks - %x, ...)",
++					chunk_count, cma_msg->params[0]);
++				for (i = 0; i < chunk_count; i++) {
++					int chunk_num = cma_msg->params[i];
++					struct page *page = vc_cma_base_page +
++					    chunk_num * PAGES_PER_CHUNK;
++					if (chunk_num >= vc_cma_chunks) {
++						LOG_ERR
++						    ("CMA_MSG_FREE - chunk %d of %d"
++						     " (value %x) exceeds maximum "
++						     "(%x)", i, chunk_count,
++						     chunk_num,
++						     vc_cma_chunks - 1);
++						break;
++					}
++
++					if (!dma_release_from_contiguous
++					    (&vc_cma_device.dev, page,
++					     PAGES_PER_CHUNK)) {
++						phys_addr_t _pa = page_to_phys(page);
++						LOG_ERR
++						    ("CMA_MSG_FREE - failed to "
++						     "release chunk %d (phys %pa, "
++						     "page %x)", chunk_num,
++						     &_pa,
++						     (unsigned int)page);
++					}
++					vc_cma_chunks_used--;
++				}
++				LOG_DBG("CMA released %d chunks -> %d used",
++					i, vc_cma_chunks_used);
++			}
++			break;
++
++		case VC_CMA_MSG_UPDATE_RESERVE:{
++				int chunks_needed =
++				    ((vc_cma_reserve_total + VC_CMA_CHUNK_SIZE -
++				      1)
++				     / VC_CMA_CHUNK_SIZE) -
++				    vc_cma_chunks_reserved;
++
++				LOG_DBG
++				    ("CMA_MSG_UPDATE_RESERVE(%d chunks needed)",
++				     chunks_needed);
++
++				/* Cap the reservations to what is available */
++				if (chunks_needed > 0) {
++					if (chunks_needed >
++					    (vc_cma_chunks -
++					     vc_cma_chunks_used))
++						chunks_needed =
++						    (vc_cma_chunks -
++						     vc_cma_chunks_used);
++
++					chunks_needed =
++					    vc_cma_alloc_chunks(chunks_needed,
++								&reply);
++				}
++
++				LOG_DBG
++				    ("CMA_MSG_UPDATE_RESERVE(%d chunks allocated)",
++				     chunks_needed);
++				vc_cma_chunks_reserved += chunks_needed;
++			}
++			break;
++
++		default:
++			LOG_ERR("unexpected msg type %d", type);
++			break;
++		}
++	}
++
++	LOG_DBG("quitting...");
++	return 0;
++}
++
++/****************************************************************************
++*
++*   vc_cma_connected_init
++*
++*   This function is called once the videocore has been connected.
++*
++***************************************************************************/
++
++static void vc_cma_connected_init(void)
++{
++	VCHIQ_SERVICE_PARAMS_T service_params;
++
++	LOG_DBG("vc_cma_connected_init");
++
++	if (!vchiu_queue_init(&cma_msg_queue, 16)) {
++		LOG_ERR("could not create CMA msg queue");
++		goto fail_queue;
++	}
++
++	if (vchiq_initialise(&cma_instance) != VCHIQ_SUCCESS)
++		goto fail_vchiq_init;
++
++	vchiq_connect(cma_instance);
++
++	service_params.fourcc = VC_CMA_FOURCC;
++	service_params.callback = cma_service_callback;
++	service_params.userdata = NULL;
++	service_params.version = VC_CMA_VERSION;
++	service_params.version_min = VC_CMA_VERSION;
++
++	if (vchiq_open_service(cma_instance, &service_params,
++			       &cma_service) != VCHIQ_SUCCESS) {
++		LOG_ERR("failed to open service - already in use?");
++		goto fail_vchiq_open;
++	}
++
++	vchiq_release_service(cma_service);
++
++	cma_worker = kthread_create(cma_worker_proc, NULL, "cma_worker");
++	if (!cma_worker) {
++		LOG_ERR("could not create CMA worker thread");
++		goto fail_worker;
++	}
++	set_user_nice(cma_worker, -20);
++	wake_up_process(cma_worker);
++
++	return;
++
++fail_worker:
++	vchiq_close_service(cma_service);
++fail_vchiq_open:
++	vchiq_shutdown(cma_instance);
++fail_vchiq_init:
++	vchiu_queue_delete(&cma_msg_queue);
++fail_queue:
++	return;
++}
++
++void
++loud_error_header(void)
++{
++	if (in_loud_error)
++		return;
++
++	LOG_ERR("============================================================"
++		"================");
++	LOG_ERR("============================================================"
++		"================");
++	LOG_ERR("=====");
++
++	in_loud_error = 1;
++}
++
++void
++loud_error_footer(void)
++{
++	if (!in_loud_error)
++		return;
++
++	LOG_ERR("=====");
++	LOG_ERR("============================================================"
++		"================");
++	LOG_ERR("============================================================"
++		"================");
++
++	in_loud_error = 0;
++}
++
++#if 1
++static int check_cma_config(void) { return 1; }
++#else
++static int
++read_vc_debug_var(VC_MEM_ACCESS_HANDLE_T handle,
++	const char *symbol,
++	void *buf, size_t bufsize)
++{
++	VC_MEM_ADDR_T vcMemAddr;
++	size_t vcMemSize;
++	uint8_t *mapAddr;
++	off_t  vcMapAddr;
++
++	if (!LookupVideoCoreSymbol(handle, symbol,
++		&vcMemAddr,
++		&vcMemSize)) {
++		loud_error_header();
++		loud_error(
++			"failed to find VC symbol \"%s\".",
++			symbol);
++		loud_error_footer();
++		return 0;
++	}
++
++	if (vcMemSize != bufsize) {
++		loud_error_header();
++		loud_error(
++			"VC symbol \"%s\" is the wrong size.",
++			symbol);
++		loud_error_footer();
++		return 0;
++	}
++
++	vcMapAddr = (off_t)vcMemAddr & VC_MEM_TO_ARM_ADDR_MASK;
++	vcMapAddr += mm_vc_mem_phys_addr;
++	mapAddr = ioremap_nocache(vcMapAddr, vcMemSize);
++	if (mapAddr == 0) {
++		loud_error_header();
++		loud_error(
++			"failed to ioremap \"%s\" @ 0x%x "
++			"(phys: 0x%x, size: %u).",
++			symbol,
++			(unsigned int)vcMapAddr,
++			(unsigned int)vcMemAddr,
++			(unsigned int)vcMemSize);
++		loud_error_footer();
++		return 0;
++	}
++
++	memcpy(buf, mapAddr, bufsize);
++	iounmap(mapAddr);
++
++	return 1;
++}
++
++
++static int
++check_cma_config(void)
++{
++	VC_MEM_ACCESS_HANDLE_T mem_hndl;
++	VC_MEM_ADDR_T mempool_start;
++	VC_MEM_ADDR_T mempool_end;
++	VC_MEM_ADDR_T mempool_offline_start;
++	VC_MEM_ADDR_T mempool_offline_end;
++	VC_MEM_ADDR_T cam_alloc_base;
++	VC_MEM_ADDR_T cam_alloc_size;
++	VC_MEM_ADDR_T cam_alloc_end;
++	int success = 0;
++
++	if (OpenVideoCoreMemory(&mem_hndl) != 0)
++		goto out;
++
++	/* Read the relevant VideoCore variables */
++	if (!read_vc_debug_var(mem_hndl, "__MEMPOOL_START",
++		&mempool_start,
++		sizeof(mempool_start)))
++		goto close;
++
++	if (!read_vc_debug_var(mem_hndl, "__MEMPOOL_END",
++		&mempool_end,
++		sizeof(mempool_end)))
++		goto close;
++
++	if (!read_vc_debug_var(mem_hndl, "__MEMPOOL_OFFLINE_START",
++		&mempool_offline_start,
++		sizeof(mempool_offline_start)))
++		goto close;
++
++	if (!read_vc_debug_var(mem_hndl, "__MEMPOOL_OFFLINE_END",
++		&mempool_offline_end,
++		sizeof(mempool_offline_end)))
++		goto close;
++
++	if (!read_vc_debug_var(mem_hndl, "cam_alloc_base",
++		&cam_alloc_base,
++		sizeof(cam_alloc_base)))
++		goto close;
++
++	if (!read_vc_debug_var(mem_hndl, "cam_alloc_size",
++		&cam_alloc_size,
++		sizeof(cam_alloc_size)))
++		goto close;
++
++	cam_alloc_end = cam_alloc_base + cam_alloc_size;
++
++	success = 1;
++
++	/* Now the sanity checks */
++	if (!mempool_offline_start)
++		mempool_offline_start = mempool_start;
++	if (!mempool_offline_end)
++		mempool_offline_end = mempool_end;
++
++	if (VCADDR_TO_PHYSADDR(mempool_offline_start) != vc_cma_base) {
++		loud_error_header();
++		loud_error(
++			"__MEMPOOL_OFFLINE_START(%x -> %lx) doesn't match "
++			"vc_cma_base(%x)",
++			mempool_offline_start,
++			VCADDR_TO_PHYSADDR(mempool_offline_start),
++			vc_cma_base);
++		success = 0;
++	}
++
++	if (VCADDR_TO_PHYSADDR(mempool_offline_end) !=
++		(vc_cma_base + vc_cma_size)) {
++		loud_error_header();
++		loud_error(
++			"__MEMPOOL_OFFLINE_END(%x -> %lx) doesn't match "
++			"vc_cma_base(%x) + vc_cma_size(%x) = %x",
++			mempool_offline_start,
++			VCADDR_TO_PHYSADDR(mempool_offline_end),
++			vc_cma_base, vc_cma_size, vc_cma_base + vc_cma_size);
++		success = 0;
++	}
++
++	if (mempool_end < mempool_start) {
++		loud_error_header();
++		loud_error(
++			"__MEMPOOL_END(%x) must not be before "
++			"__MEMPOOL_START(%x)",
++			mempool_end,
++			mempool_start);
++		success = 0;
++	}
++
++	if (mempool_offline_end < mempool_offline_start) {
++		loud_error_header();
++		loud_error(
++			"__MEMPOOL_OFFLINE_END(%x) must not be before "
++			"__MEMPOOL_OFFLINE_START(%x)",
++			mempool_offline_end,
++			mempool_offline_start);
++		success = 0;
++	}
++
++	if (mempool_offline_start < mempool_start) {
++		loud_error_header();
++		loud_error(
++			"__MEMPOOL_OFFLINE_START(%x) must not be before "
++			"__MEMPOOL_START(%x)",
++			mempool_offline_start,
++			mempool_start);
++		success = 0;
++	}
++
++	if (mempool_offline_end > mempool_end) {
++		loud_error_header();
++		loud_error(
++			"__MEMPOOL_OFFLINE_END(%x) must not be after "
++			"__MEMPOOL_END(%x)",
++			mempool_offline_end,
++			mempool_end);
++		success = 0;
++	}
++
++	if ((cam_alloc_base < mempool_end) &&
++		(cam_alloc_end > mempool_start)) {
++		loud_error_header();
++		loud_error(
++			"cam_alloc pool(%x-%x) overlaps "
++			"mempool(%x-%x)",
++			cam_alloc_base, cam_alloc_end,
++			mempool_start, mempool_end);
++		success = 0;
++	}
++
++	loud_error_footer();
++
++close:
++	CloseVideoCoreMemory(mem_hndl);
++
++out:
++	return success;
++}
++#endif
++
++static int vc_cma_init(void)
++{
++	int rc = -EFAULT;
++	struct device *dev;
++
++	if (!check_cma_config())
++		goto out_release;
++
++	LOG_INFO("vc-cma: Videocore CMA driver");
++	LOG_INFO("vc-cma: vc_cma_base      = %pa", &vc_cma_base);
++	LOG_INFO("vc-cma: vc_cma_size      = 0x%08x (%u MiB)",
++		 vc_cma_size, vc_cma_size / (1024 * 1024));
++	LOG_INFO("vc-cma: vc_cma_initial   = 0x%08x (%u MiB)",
++		 vc_cma_initial, vc_cma_initial / (1024 * 1024));
++
++	vc_cma_base_page = phys_to_page(vc_cma_base);
++
++	if (vc_cma_chunks) {
++		int chunks_needed = vc_cma_initial / VC_CMA_CHUNK_SIZE;
++
++		for (vc_cma_chunks_used = 0;
++		     vc_cma_chunks_used < chunks_needed; vc_cma_chunks_used++) {
++			struct page *chunk;
++			chunk = dma_alloc_from_contiguous(&vc_cma_device.dev,
++							  PAGES_PER_CHUNK,
++							  VC_CMA_CHUNK_ORDER);
++			if (!chunk)
++				break;
++			BUG_ON(((page_to_phys(chunk) - vc_cma_base) %
++				VC_CMA_CHUNK_SIZE) != 0);
++		}
++		if (vc_cma_chunks_used != chunks_needed) {
++			LOG_ERR("%s: dma_alloc_from_contiguous failed (%d "
++				"bytes, allocation %d of %d)",
++				__func__, VC_CMA_CHUNK_SIZE,
++				vc_cma_chunks_used, chunks_needed);
++			goto out_release;
++		}
++
++		vchiq_add_connected_callback(vc_cma_connected_init);
++	}
++
++	rc = alloc_chrdev_region(&vc_cma_devnum, 0, 1, DRIVER_NAME);
++	if (rc < 0) {
++		LOG_ERR("%s: alloc_chrdev_region failed (rc=%d)", __func__, rc);
++		goto out_release;
++	}
++
++	cdev_init(&vc_cma_cdev, &vc_cma_fops);
++	rc = cdev_add(&vc_cma_cdev, vc_cma_devnum, 1);
++	if (rc != 0) {
++		LOG_ERR("%s: cdev_add failed (rc=%d)", __func__, rc);
++		goto out_unregister;
++	}
++
++	vc_cma_class = class_create(THIS_MODULE, DRIVER_NAME);
++	if (IS_ERR(vc_cma_class)) {
++		rc = PTR_ERR(vc_cma_class);
++		LOG_ERR("%s: class_create failed (rc=%d)", __func__, rc);
++		goto out_cdev_del;
++	}
++
++	dev = device_create(vc_cma_class, NULL, vc_cma_devnum, NULL,
++			    DRIVER_NAME);
++	if (IS_ERR(dev)) {
++		rc = PTR_ERR(dev);
++		LOG_ERR("%s: device_create failed (rc=%d)", __func__, rc);
++		goto out_class_destroy;
++	}
++
++	vc_cma_proc_entry = proc_create(DRIVER_NAME, 0444, NULL, &vc_cma_proc_fops);
++	if (vc_cma_proc_entry == NULL) {
++		rc = -EFAULT;
++		LOG_ERR("%s: proc_create failed", __func__);
++		goto out_device_destroy;
++	}
++
++	vc_cma_inited = 1;
++	return 0;
++
++out_device_destroy:
++	device_destroy(vc_cma_class, vc_cma_devnum);
++
++out_class_destroy:
++	class_destroy(vc_cma_class);
++	vc_cma_class = NULL;
++
++out_cdev_del:
++	cdev_del(&vc_cma_cdev);
++
++out_unregister:
++	unregister_chrdev_region(vc_cma_devnum, 1);
++
++out_release:
++	/* It is tempting to try to clean up by calling
++	   dma_release_from_contiguous for all allocated chunks, but it isn't
++	   a very safe thing to do. If vc_cma_initial is non-zero it is because
++	   VideoCore is already using that memory, so giving it back to Linux
++	   is likely to be fatal.
++	 */
++	return -1;
++}
++
++/****************************************************************************
++*
++*   vc_cma_exit
++*
++***************************************************************************/
++
++static void __exit vc_cma_exit(void)
++{
++	LOG_DBG("%s: called", __func__);
++
++	if (vc_cma_inited) {
++		remove_proc_entry(DRIVER_NAME, NULL);
++		device_destroy(vc_cma_class, vc_cma_devnum);
++		class_destroy(vc_cma_class);
++		cdev_del(&vc_cma_cdev);
++		unregister_chrdev_region(vc_cma_devnum, 1);
++	}
++}
++
++module_init(vc_cma_init);
++module_exit(vc_cma_exit);
++MODULE_LICENSE("GPL");
++MODULE_AUTHOR("Broadcom Corporation");
+--- /dev/null
++++ b/include/linux/broadcom/vc_cma.h
+@@ -0,0 +1,29 @@
++/*****************************************************************************
++* Copyright 2012 Broadcom Corporation.  All rights reserved.
++*
++* Unless you and Broadcom execute a separate written software license
++* agreement governing use of this software, this software is licensed to you
++* under the terms of the GNU General Public License version 2, available at
++* http://www.broadcom.com/licenses/GPLv2.php (the "GPL").
++*
++* Notwithstanding the above, under no circumstances may you combine this
++* software in any way with any other Broadcom software provided under a
++* license other than the GPL, without Broadcom's express prior written
++* consent.
++*****************************************************************************/
++
++#if !defined( VC_CMA_H )
++#define VC_CMA_H
++
++#include <linux/ioctl.h>
++
++#define VC_CMA_IOC_MAGIC 0xc5
++
++#define VC_CMA_IOC_RESERVE _IO(VC_CMA_IOC_MAGIC, 0)
++
++#ifdef __KERNEL__
++extern void __init vc_cma_early_init(void);
++extern void __init vc_cma_reserve(void);
++#endif
++
++#endif /* VC_CMA_H */