Hi folks,
I have an old TV box based off the Amlogic S905X ARM64 SoC, a Tanix TX5, which originally ran Android on it. I don't like being locked out of the potential of my hardware, so I followed closely the progress of the Armbian project, and I recently have installed version 5.67, which is based off Ubuntu Bionic, running on Linux 4.19.6.
Everything works great, there are working drivers for ethernet, wifi, blutooth, etc, but there is unfortunately no kernel driver included to support the integrated mali450 gpu. The hdmi output does work, but Xorg is running on fbdev, and screen updating is painfully slow, videos are unwatchable in full screen. I'm not too sure what the story is but apparently amlogic keeps their current version of the driver to themselves. However by going on their FTP site, I found an old source tree for the kernel driver (
http://openlinux.amlogic.com:8000/do...d7b1d1b.tar.gz ). It is out of date, but I have made some headway into porting it to the current kernel, with mostly easy fixes up to now. I can now compile about half of the source files just fine.
I should clarify I'm not a linux developer by trade, I'm not even a C developer... I dabble, I know just enough to be dangerous, and I'm highly motivated. My daily trade is C# though, so I do know more or less what I'm doing.
The current issue I am having is with mali/linux/mali_osk_timers.c . This is the original code:
Code:
/*
* Copyright (C) 2010-2014, 2016 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.
*/
/**
* @file mali_osk_timers.c
* Implementation of the OS abstraction layer for the kernel device driver
*/
#include <linux/timer.h>
#include <linux/slab.h>
#include "mali_osk.h"
#include "mali_kernel_common.h"
struct _mali_osk_timer_t_struct {
struct timer_list timer;
};
typedef void (*timer_timeout_function_t)(unsigned long);
_mali_osk_timer_t *_mali_osk_timer_init(void)
{
_mali_osk_timer_t *t = (_mali_osk_timer_t *)kmalloc(sizeof(_mali_osk_timer_t), GFP_KERNEL);
if (NULL != t) init_timer(&t->timer);
return t;
}
void _mali_osk_timer_add(_mali_osk_timer_t *tim, unsigned long ticks_to_expire)
{
MALI_DEBUG_ASSERT_POINTER(tim);
tim->timer.expires = jiffies + ticks_to_expire;
add_timer(&(tim->timer));
}
void _mali_osk_timer_mod(_mali_osk_timer_t *tim, unsigned long ticks_to_expire)
{
MALI_DEBUG_ASSERT_POINTER(tim);
mod_timer(&(tim->timer), jiffies + ticks_to_expire);
}
void _mali_osk_timer_del(_mali_osk_timer_t *tim)
{
MALI_DEBUG_ASSERT_POINTER(tim);
del_timer_sync(&(tim->timer));
}
void _mali_osk_timer_del_async(_mali_osk_timer_t *tim)
{
MALI_DEBUG_ASSERT_POINTER(tim);
del_timer(&(tim->timer));
}
mali_bool _mali_osk_timer_pending(_mali_osk_timer_t *tim)
{
MALI_DEBUG_ASSERT_POINTER(tim);
return 1 == timer_pending(&(tim->timer));
}
void _mali_osk_timer_setcallback(_mali_osk_timer_t *tim, _mali_osk_timer_callback_t callback, void *data)
{
MALI_DEBUG_ASSERT_POINTER(tim);
tim->timer.data = (unsigned long)data;
tim->timer.function = (timer_timeout_function_t)callback;
}
void _mali_osk_timer_term(_mali_osk_timer_t *tim)
{
MALI_DEBUG_ASSERT_POINTER(tim);
kfree(tim);
}
The main problem here is that this code uses the timers via an interface that was deprecated long ago, and removed entirely from the kernel in 4.15. I was able to look up how to port this code, and managed almost the entire file, but in the end I'm not familiar enough with C syntax and pointer usage rules to figure out how to do it. The main problematic is the _mali_osk_timer_setcallback() function. I'm not really sure how to go about modifying it while also keeping the same function signature.
