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// SPDX-License-Identifier: GPL-2.0 WITH Linux-syscall-note
/*
*
* (C) COPYRIGHT 2015, 2017-2021 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 license.
*
* 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.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, you can access it online at
* http://www.gnu.org/licenses/gpl-2.0.html.
*
*/
#include <mali_kbase.h>
#include <mali_kbase_defs.h>
#include <linux/clk.h>
#include "mali_kbase_config_platform.h"
#if MALI_USE_CSF
#include <asm/arch_timer.h>
#endif
static void *enumerate_gpu_clk(struct kbase_device *kbdev,
unsigned int index)
{
if (index >= kbdev->nr_clocks)
return NULL;
#if MALI_USE_CSF
if (of_machine_is_compatible("arm,juno"))
WARN_ON(kbdev->nr_clocks != 1);
#endif
return kbdev->clocks[index];
}
static unsigned long get_gpu_clk_rate(struct kbase_device *kbdev,
void *gpu_clk_handle)
{
#if MALI_USE_CSF
/* On Juno fpga platforms, the GPU clock rate is reported as 600 MHZ at
* the boot time. Then after the first call to kbase_devfreq_target()
* the clock rate is reported as 450 MHZ and the frequency does not
* change after that. But the actual frequency at which GPU operates
* is always 50 MHz, which is equal to the frequency of system counter
* and HW counters also increment at the same rate.
* DVFS, which is a client of kbase_ipa_control, needs normalization of
* GPU_ACTIVE counter to calculate the time for which GPU has been busy.
* So for the correct normalization need to return the system counter
* frequency value.
* This is a reasonable workaround as the frequency value remains same
* throughout. It can be removed after GPUCORE-25693.
*/
if (of_machine_is_compatible("arm,juno"))
return arch_timer_get_cntfrq();
#endif
return clk_get_rate((struct clk *)gpu_clk_handle);
}
static int gpu_clk_notifier_register(struct kbase_device *kbdev,
void *gpu_clk_handle, struct notifier_block *nb)
{
compiletime_assert(offsetof(struct clk_notifier_data, clk) ==
offsetof(struct kbase_gpu_clk_notifier_data, gpu_clk_handle),
"mismatch in the offset of clk member");
compiletime_assert(sizeof(((struct clk_notifier_data *)0)->clk) ==
sizeof(((struct kbase_gpu_clk_notifier_data *)0)->gpu_clk_handle),
"mismatch in the size of clk member");
#if MALI_USE_CSF
/* Frequency is fixed on Juno platforms */
if (of_machine_is_compatible("arm,juno"))
return 0;
#endif
return clk_notifier_register((struct clk *)gpu_clk_handle, nb);
}
static void gpu_clk_notifier_unregister(struct kbase_device *kbdev,
void *gpu_clk_handle, struct notifier_block *nb)
{
#if MALI_USE_CSF
if (of_machine_is_compatible("arm,juno"))
return;
#endif
clk_notifier_unregister((struct clk *)gpu_clk_handle, nb);
}
struct kbase_clk_rate_trace_op_conf clk_rate_trace_ops = {
.get_gpu_clk_rate = get_gpu_clk_rate,
.enumerate_gpu_clk = enumerate_gpu_clk,
.gpu_clk_notifier_register = gpu_clk_notifier_register,
.gpu_clk_notifier_unregister = gpu_clk_notifier_unregister,
};
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