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/*
* Copyright (C) 2010 ARM Limited. All rights reserved.
*
* This program is free software and is provided to you under the terms of the GNU General Public License version 2
* as published by the Free Software Foundation, and any use by you of this program is subject to the terms of such GNU licence.
*
* A copy of the licence is included with the program, and can also be obtained from Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
*/

#include <linux/module.h> /* kernel module definitions */
#include <linux/fs.h> /* file system operations */
#include <linux/cdev.h> /* character device definitions */
#include <linux/ioport.h> /* request_mem_region */
#include <linux/mm.h> /* memory management functions and types */
#include <asm/uaccess.h> /* user space access */
#include <asm/atomic.h>
#include <linux/device.h>
#include <linux/debugfs.h>

#include "arch/config.h" /* Configuration for current platform. The symlinc for arch is set by Makefile */
#include "ump_ioctl.h"
#include "ump_kernel_common.h"
#include "ump_kernel_interface.h"
#include "ump_kernel_interface_ref_drv.h"
#include "ump_kernel_descriptor_mapping.h"
#include "ump_kernel_memory_backend.h"
#include "ump_kernel_memory_backend_os.h"
#include "ump_kernel_memory_backend_dedicated.h"
#include "ump_kernel_license.h"

#include "ump_osk.h"
#include "ump_ukk.h"
#include "ump_uk_types.h"
#include "ump_ukk_wrappers.h"
#include "ump_ukk_ref_wrappers.h"

#ifdef CONFIG_ION_EXYNOS
#include <linux/ion.h>
extern struct ion_device *ion_exynos;
struct ion_client *ion_client_ump = NULL;
#endif

/* Module parameter to control log level */
int ump_debug_level = 3;
module_param(ump_debug_level, int, S_IRUSR | S_IWUSR | S_IWGRP | S_IRGRP | S_IROTH); /* rw-rw-r-- */
MODULE_PARM_DESC(ump_debug_level, "Higher number, more dmesg output");

/* By default the module uses any available major, but it's possible to set it at load time to a specific number */
int ump_major = 243;
module_param(ump_major, int, S_IRUGO); /* r--r--r-- */
MODULE_PARM_DESC(ump_major, "Device major number");

/* Name of the UMP device driver */
static char ump_dev_name[] = "ump"; /* should be const, but the functions we call requires non-cost */


static struct dentry *ump_debugfs_dir = NULL;

/*
* The data which we attached to each virtual memory mapping request we get.
* Each memory mapping has a reference to the UMP memory it maps.
* We release this reference when the last memory mapping is unmapped.
*/
typedef struct ump_vma_usage_tracker
{
int references;
ump_dd_handle handle;
} ump_vma_usage_tracker;

struct ump_device
{
struct cdev cdev;
#if UMP_LICENSE_IS_GPL
struct class * ump_class;
#endif
};

/* The global variable containing the global device data */
static struct ump_device ump_device;


/* Forward declare static functions */
static int ump_file_open(struct inode *inode, struct file *filp);
static int ump_file_release(struct inode *inode, struct file *filp);
#ifdef HAVE_UNLOCKED_IOCTL
static long ump_file_ioctl(struct file *filp, unsigned int cmd, unsigned long arg);
#else
static int ump_file_ioctl(struct inode *inode, struct file *filp, unsigned int cmd, unsigned long arg);
#endif
static int ump_file_mmap(struct file * filp, struct vm_area_struct * vma);

#ifdef CONFIG_VIDEO_MALI400MP
extern int map_errcode( _mali_osk_errcode_t err );
#endif

/* This variable defines the file operations this UMP device driver offer */
static struct file_operations ump_fops =
{
.owner = THIS_MODULE,
.open = ump_file_open,
.release = ump_file_release,
#ifdef HAVE_UNLOCKED_IOCTL
.unlocked_ioctl = ump_file_ioctl,
#else
.ioctl = ump_file_ioctl,
#endif
.mmap = ump_file_mmap
};


/* This function is called by Linux to initialize this module.
* All we do is initialize the UMP device driver.
*/
static int ump_initialize_module(void)
{
_mali_osk_errcode_t err;

DBG_MSG(2, ("Inserting UMP device driver. Compiled: %s, time: %s\n", __DATE__, __TIME__));

err = ump_kernel_constructor();
if (_MALI_OSK_ERR_OK != err)
{
MSG_ERR(("UMP device driver init failed\n"));
return map_errcode(err);
}

MSG(("UMP device driver %s loaded\n", SVN_REV_STRING));
return 0;
}



/*
* This function is called by Linux to unload/terminate/exit/cleanup this module.
* All we do is terminate the UMP device driver.
*/
static void ump_cleanup_module(void)
{
#ifdef CONFIG_ION_EXYNOS
if (ion_client_ump)
ion_client_destroy(ion_client_ump);
#endif

DBG_MSG(2, ("Unloading UMP device driver\n"));
ump_kernel_destructor();
DBG_MSG(2, ("Module unloaded\n"));
}



static ssize_t ump_memory_used_read(struct file *filp, char __user *ubuf, size_t cnt, loff_t *ppos)
{
        char buf[64];
        size_t r;
        u32 mem = _ump_ukk_report_memory_usage();

        r = snprintf(buf, 64, "%u\n", mem);
        return simple_read_from_buffer(ubuf, cnt, ppos, buf, r);
}

static const struct file_operations ump_memory_usage_fops = {
        .owner = THIS_MODULE,
        .read = ump_memory_used_read,
};

/*
* Initialize the UMP device driver.
*/
int ump_kernel_device_initialize(void)
{
int err;
dev_t dev = 0;
ump_debugfs_dir = debugfs_create_dir(ump_dev_name, NULL);
if (ERR_PTR(-ENODEV) == ump_debugfs_dir)
{
ump_debugfs_dir = NULL;
}
else
{
debugfs_create_file("memory_usage", 0400, ump_debugfs_dir, NULL, &ump_memory_usage_fops);
}

if (0 == ump_major)
{
/* auto select a major */
err = alloc_chrdev_region(&dev, 0, 1, ump_dev_name);
ump_major = MAJOR(dev);
}
else
{
/* use load time defined major number */
dev = MKDEV(ump_major, 0);
err = register_chrdev_region(dev, 1, ump_dev_name);
}

if (0 == err)
{
memset(&ump_device, 0, sizeof(ump_device));

/* initialize our char dev data */
cdev_init(&ump_device.cdev, &ump_fops);
ump_device.cdev.owner = THIS_MODULE;
ump_device.cdev.ops = &ump_fops;

/* register char dev with the kernel */
err = cdev_add(&ump_device.cdev, dev, 1/*count*/);
if (0 == err)
{

#if UMP_LICENSE_IS_GPL
ump_device.ump_class = class_create(THIS_MODULE, ump_dev_name);
if (IS_ERR(ump_device.ump_class))
{
err = PTR_ERR(ump_device.ump_class);
}
else
{
struct device * mdev;
mdev = device_create(ump_device.ump_class, NULL, dev, NULL, ump_dev_name);
if (!IS_ERR(mdev))
{
return 0;
}

err = PTR_ERR(mdev);
}
cdev_del(&ump_device.cdev);
#else
return 0;
#endif
}

unregister_chrdev_region(dev, 1);
}

return err;
}



/*
* Terminate the UMP device driver
*/
void ump_kernel_device_terminate(void)
{
dev_t dev = MKDEV(ump_major, 0);

#if UMP_LICENSE_IS_GPL
device_destroy(ump_device.ump_class, dev);
class_destroy(ump_device.ump_class);
#endif

/* unregister char device */
cdev_del(&ump_device.cdev);

/* free major */
unregister_chrdev_region(dev, 1);

if(ump_debugfs_dir)
debugfs_remove_recursive(ump_debugfs_dir);
}

/*
* Open a new session. User space has called open() on us.
*/
static int ump_file_open(struct inode *inode, struct file *filp)
{
struct ump_session_data * session_data;
_mali_osk_errcode_t err;

/* input validation */
if (0 != MINOR(inode->i_rdev))
{
MSG_ERR(("Minor not zero in ump_file_open()\n"));
return -ENODEV;
}

/* Call the OS-Independent UMP Open function */
err = _ump_ukk_open((void**) &session_data );
if( _MALI_OSK_ERR_OK != err )
{
MSG_ERR(("Ump failed to open a new session\n"));
return map_errcode( err );
}

filp->private_data = (void*)session_data;
filp->f_pos = 0;

return 0; /* success */
}



/*
* Close a session. User space has called close() or crashed/terminated.
*/
static int ump_file_release(struct inode *inode, struct file *filp)
{
_mali_osk_errcode_t err;

err = _ump_ukk_close((void**) &filp->private_data );
if( _MALI_OSK_ERR_OK != err )
{
return map_errcode( err );
}

return 0; /* success */
}



/*
* Handle IOCTL requests.
*/
#ifdef HAVE_UNLOCKED_IOCTL
static long ump_file_ioctl(struct file *filp, unsigned int cmd, unsigned long arg)
#else
static int ump_file_ioctl(struct inode *inode, struct file *filp, unsigned int cmd, unsigned long arg)
#endif
{
int err = -ENOTTY;
void __user * argument;
struct ump_session_data * session_data;

#ifndef HAVE_UNLOCKED_IOCTL
(void)inode; /* inode not used */
#endif

session_data = (struct ump_session_data *)filp->private_data;
if (NULL == session_data)
{
MSG_ERR(("No session data attached to file object\n"));
return -ENOTTY;
}

/* interpret the argument as a user pointer to something */
argument = (void __user *)arg;

switch (cmd)
{
case UMP_IOC_QUERY_API_VERSION:
err = ump_get_api_version_wrapper((u32 __user *)argument, session_data);
break;

case UMP_IOC_ALLOCATE :
err = ump_allocate_wrapper((u32 __user *)argument, session_data);
break;
#ifdef CONFIG_ION_EXYNOS
case UMP_IOC_ION_IMPORT:
err = ump_ion_import_wrapper((u32 __user *)argument, session_data);
break;
#endif

case UMP_IOC_RELEASE:
err = ump_release_wrapper((u32 __user *)argument, session_data);
break;

case UMP_IOC_SIZE_GET:
err = ump_size_get_wrapper((u32 __user *)argument, session_data);
break;

case UMP_IOC_MSYNC:
err = ump_msync_wrapper((u32 __user *)argument, session_data);
break;

default:
DBG_MSG(1, ("No handler for IOCTL. cmd: 0x%08x, arg: 0x%08lx\n", cmd, arg));
err = -EFAULT;
break;
}

return err;
}

#ifndef CONFIG_VIDEO_MALI400MP
int map_errcode( _mali_osk_errcode_t err )
{
    switch(err)
    {
        case _MALI_OSK_ERR_OK : return 0;
        case _MALI_OSK_ERR_FAULT: return -EFAULT;
        case _MALI_OSK_ERR_INVALID_FUNC: return -ENOTTY;
        case _MALI_OSK_ERR_INVALID_ARGS: return -EINVAL;
        case _MALI_OSK_ERR_NOMEM: return -ENOMEM;
        case _MALI_OSK_ERR_TIMEOUT: return -ETIMEDOUT;
        case _MALI_OSK_ERR_RESTARTSYSCALL: return -ERESTARTSYS;
        case _MALI_OSK_ERR_ITEM_NOT_FOUND: return -ENOENT;
        default: return -EFAULT;
    }
}
#endif

/*
* Handle from OS to map specified virtual memory to specified UMP memory.
*/
static int ump_file_mmap(struct file * filp, struct vm_area_struct * vma)
{
_ump_uk_map_mem_s args;
_mali_osk_errcode_t err;
struct ump_session_data * session_data;

/* Validate the session data */
session_data = (struct ump_session_data *)filp->private_data;
if (NULL == session_data || NULL == session_data->cookies_map->table->mappings)
{
MSG_ERR(("mmap() called without any session data available\n"));
return -EFAULT;
}

/* Re-pack the arguments that mmap() packed for us */
args.ctx = session_data;
args.phys_addr = 0;
args.size = vma->vm_end - vma->vm_start;
args._ukk_private = vma;
args.secure_id = vma->vm_pgoff;
args.is_cached = 0;

if (!(vma->vm_flags & VM_SHARED))
{
args.is_cached = 1;
vma->vm_flags = vma->vm_flags | VM_SHARED | VM_MAYSHARE ;
DBG_MSG(3, ("UMP Map function: Forcing the CPU to use cache\n"));
}

DBG_MSG(4, ("UMP vma->flags: %x\n", vma->vm_flags ));

/* Call the common mmap handler */
err = _ump_ukk_map_mem( &args );
if ( _MALI_OSK_ERR_OK != err)
{
MSG_ERR(("_ump_ukk_map_mem() failed in function ump_file_mmap()"));
return map_errcode( err );
}

return 0; /* success */
}

/* Export UMP kernel space API functions */
EXPORT_SYMBOL(ump_dd_secure_id_get);
EXPORT_SYMBOL(ump_dd_handle_create_from_secure_id);
EXPORT_SYMBOL(ump_dd_phys_block_count_get);
EXPORT_SYMBOL(ump_dd_phys_block_get);
EXPORT_SYMBOL(ump_dd_phys_blocks_get);
EXPORT_SYMBOL(ump_dd_size_get);
EXPORT_SYMBOL(ump_dd_reference_add);
EXPORT_SYMBOL(ump_dd_reference_release);
EXPORT_SYMBOL(ump_dd_meminfo_get);
EXPORT_SYMBOL(ump_dd_meminfo_set);
EXPORT_SYMBOL(ump_dd_handle_get_from_vaddr);

/* Export our own extended kernel space allocator */
EXPORT_SYMBOL(ump_dd_handle_create_from_phys_blocks);

/* Setup init and exit functions for this module */
//module_init(ump_initialize_module);
arch_initcall(ump_initialize_module);
module_exit(ump_cleanup_module);

/* And some module informatio */
MODULE_LICENSE(UMP_KERNEL_LINUX_LICENSE);
MODULE_AUTHOR("ARM Ltd.");
MODULE_VERSION(SVN_REV_STRING);
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