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/*
* arch/arm/mach-exynos/secmem-allocdev.c
*
* Copyright (c) 2010-2011 Samsung Electronics Co., Ltd.
* http://www.samsung.com
*
* 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.
*/
#include <linux/device.h>
#include <linux/cma.h>
#include <linux/uaccess.h>
#include <linux/fs.h>
#include <linux/pm_runtime.h>
#include <linux/slab.h>
#include <linux/mm.h>
#include <asm/memory.h>
#include <asm/cacheflush.h>
#include <plat/devs.h>
#include <plat/pd.h>
#include <mach/secmem.h>
#include <mach/cpufreq.h>
#include <mach/dev.h>
#define DRM_CPU_FREQ 400000
#define DRM_BUS_FREQ 267160
struct miscdevice secmem;
struct secmem_crypto_driver_ftn *crypto_driver;
static char *secmem_info[] = {
"mfc", /* 0 */
"fimc", /* 1 */
"mfc-shm", /* 2 */
"sectbl", /* 3 */
"video", /* 4 */
"fimd", /* 5 */
NULL
};
static bool drm_onoff = false;
#define SECMEM_IS_PAGE_ALIGNED(addr) (!((addr) & (~PAGE_MASK)))
static int secmem_mmap(struct file *file, struct vm_area_struct *vma)
{
unsigned long size = vma->vm_end - vma->vm_start;
BUG_ON(!SECMEM_IS_PAGE_ALIGNED(vma->vm_start));
BUG_ON(!SECMEM_IS_PAGE_ALIGNED(vma->vm_end));
vma->vm_flags |= VM_RESERVED;
vma->vm_page_prot = pgprot_noncached(vma->vm_page_prot);
if (remap_pfn_range(vma, vma->vm_start, vma->vm_pgoff,
size, vma->vm_page_prot)) {
printk(KERN_ERR "%s : remap_pfn_range() failed!\n", __func__);
return -EAGAIN;
}
return 0;
}
static long secmem_ioctl(struct file *filp, unsigned int cmd, unsigned long arg)
{
switch (cmd) {
case SECMEM_IOC_CHUNKINFO:
{
struct cma_info info;
struct secchunk_info minfo;
char **mname;
int nbufs = 0;
for (mname = secmem_info; *mname != NULL; mname++)
nbufs++;
if (nbufs == 0)
return -ENOMEM;
if (copy_from_user(&minfo, (void __user *)arg, sizeof(minfo)))
return -EFAULT;
if (minfo.index < 0)
return -EINVAL;
if (minfo.index >= nbufs) {
minfo.index = -1; /* No more memory region */
} else {
if (cma_info(&info, secmem.this_device,
secmem_info[minfo.index]))
return -EINVAL;
minfo.base = info.lower_bound;
minfo.size = info.total_size;
}
if (copy_to_user((void __user *)arg, &minfo, sizeof(minfo)))
return -EFAULT;
}
break;
case SECMEM_IOC_GET_DRM_ONOFF:
if (copy_to_user((void __user *)arg, &drm_onoff, sizeof(int)))
return -EFAULT;
break;
case SECMEM_IOC_SET_DRM_ONOFF:
{
int val = 0;
unsigned int cpufreq;
#if defined(CONFIG_BUSFREQ_OPP)
struct device *bus_dev=NULL;
bus_dev = dev_get("exynos-busfreq");
#endif
if (copy_from_user(&val, (int __user *)arg, sizeof(int)))
return -EFAULT;
if (val) {
exynos_cpufreq_get_level(DRM_CPU_FREQ, &cpufreq);
exynos_cpufreq_lock(DVFS_LOCK_ID_DRM, cpufreq);
#if defined(CONFIG_BUSFREQ_OPP)
dev_lock(bus_dev, secmem.this_device, DRM_BUS_FREQ);
#endif
if (drm_onoff == false) {
drm_onoff = true;
pm_runtime_forbid((*(secmem.this_device)).parent);
exynos_pd_enable(&exynos4_device_pd[PD_MFC].dev);
} else
printk(KERN_ERR "%s: DRM is already on\n", __func__);
} else {
exynos_cpufreq_lock_free(DVFS_LOCK_ID_DRM);
#if defined(CONFIG_BUSFREQ_OPP)
dev_unlock(bus_dev, secmem.this_device);
#endif
if (drm_onoff == true) {
drm_onoff = false;
pm_runtime_allow((*(secmem.this_device)).parent);
} else
printk(KERN_ERR "%s: DRM is already off\n", __func__);
}
}
break;
case SECMEM_IOC_GET_CRYPTO_LOCK:
{
int i;
int ret;
if (crypto_driver) {
for (i = 0; i < 100; i++) {
ret = crypto_driver->lock();
if (ret == 0)
break;
printk(KERN_ERR "%s : Retry to get sync lock.\n",
__func__);
}
return ret;
}
break;
}
case SECMEM_IOC_RELEASE_CRYPTO_LOCK:
{
if (crypto_driver)
return crypto_driver->release();
break;
}
case SECMEM_IOC_GET_ADDR:
{
struct secmem_region region;
if (copy_from_user(®ion, (void __user *)arg,
sizeof(struct secmem_region)))
return -EFAULT;
region.virt_addr = kmalloc(region.len, GFP_KERNEL | GFP_DMA);
if (!region.virt_addr) {
printk(KERN_ERR "%s: Get memory address failed. [size : %ld]\n", __func__, region.len);
return -EFAULT;
}
region.phys_addr = virt_to_phys(region.virt_addr);
dmac_map_area(region.virt_addr, region.len / sizeof(unsigned long), 2);
if (copy_to_user((void __user *)arg, ®ion,
sizeof(struct secmem_region)))
return -EFAULT;
break;
}
case SECMEM_IOC_RELEASE_ADDR:
{
struct secmem_region region;
if (copy_from_user(®ion, (void __user *)arg,
sizeof(struct secmem_region)))
return -EFAULT;
dmac_unmap_area(region.virt_addr, region.len, 2);
kfree(region.virt_addr);
break;
}
default:
return -ENOTTY;
}
return 0;
}
void secmem_crypto_register(struct secmem_crypto_driver_ftn *ftn)
{
crypto_driver = ftn;
}
EXPORT_SYMBOL(secmem_crypto_register);
void secmem_crypto_deregister(void)
{
crypto_driver = NULL;
}
EXPORT_SYMBOL(secmem_crypto_deregister);
static struct file_operations secmem_fops = {
.unlocked_ioctl = &secmem_ioctl,
.mmap = secmem_mmap,
};
static int __init secmem_init(void)
{
int ret;
secmem.minor = MISC_DYNAMIC_MINOR;
secmem.name = "s5p-smem";
secmem.fops = &secmem_fops;
ret = misc_register(&secmem);
if (ret)
return ret;
crypto_driver = NULL;
pm_runtime_enable(secmem.this_device);
return 0;
}
static void __exit secmem_exit(void)
{
__pm_runtime_disable(secmem.this_device, false);
misc_deregister(&secmem);
}
module_init(secmem_init);
module_exit(secmem_exit);
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