// SPDX-License-Identifier: GPL-2.0 WITH Linux-syscall-note
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/*
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*
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* (C) COPYRIGHT 2015, 2017-2021 ARM Limited. All rights reserved.
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*
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* This program is free software and is provided to you under the terms of the
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* GNU General Public License version 2 as published by the Free Software
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* Foundation, and any use by you of this program is subject to the terms
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* of such GNU license.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, you can access it online at
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* http://www.gnu.org/licenses/gpl-2.0.html.
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*
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*/
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#include <mali_kbase.h>
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#include <mali_kbase_defs.h>
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#include <linux/clk.h>
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#include "mali_kbase_config_platform.h"
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#if MALI_USE_CSF
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#include <asm/arch_timer.h>
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#endif
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static void *enumerate_gpu_clk(struct kbase_device *kbdev,
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unsigned int index)
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{
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if (index >= kbdev->nr_clocks)
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return NULL;
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#if MALI_USE_CSF
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if (of_machine_is_compatible("arm,juno"))
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WARN_ON(kbdev->nr_clocks != 1);
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#endif
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return kbdev->clocks[index];
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}
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static unsigned long get_gpu_clk_rate(struct kbase_device *kbdev,
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void *gpu_clk_handle)
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{
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#if MALI_USE_CSF
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/* On Juno fpga platforms, the GPU clock rate is reported as 600 MHZ at
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* the boot time. Then after the first call to kbase_devfreq_target()
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* the clock rate is reported as 450 MHZ and the frequency does not
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* change after that. But the actual frequency at which GPU operates
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* is always 50 MHz, which is equal to the frequency of system counter
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* and HW counters also increment at the same rate.
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* DVFS, which is a client of kbase_ipa_control, needs normalization of
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* GPU_ACTIVE counter to calculate the time for which GPU has been busy.
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* So for the correct normalization need to return the system counter
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* frequency value.
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* This is a reasonable workaround as the frequency value remains same
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* throughout. It can be removed after GPUCORE-25693.
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*/
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if (of_machine_is_compatible("arm,juno"))
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return arch_timer_get_cntfrq();
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#endif
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return clk_get_rate((struct clk *)gpu_clk_handle);
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}
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static int gpu_clk_notifier_register(struct kbase_device *kbdev,
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void *gpu_clk_handle, struct notifier_block *nb)
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{
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compiletime_assert(offsetof(struct clk_notifier_data, clk) ==
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offsetof(struct kbase_gpu_clk_notifier_data, gpu_clk_handle),
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"mismatch in the offset of clk member");
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compiletime_assert(sizeof(((struct clk_notifier_data *)0)->clk) ==
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sizeof(((struct kbase_gpu_clk_notifier_data *)0)->gpu_clk_handle),
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"mismatch in the size of clk member");
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#if MALI_USE_CSF
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/* Frequency is fixed on Juno platforms */
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if (of_machine_is_compatible("arm,juno"))
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return 0;
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#endif
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return clk_notifier_register((struct clk *)gpu_clk_handle, nb);
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}
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static void gpu_clk_notifier_unregister(struct kbase_device *kbdev,
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void *gpu_clk_handle, struct notifier_block *nb)
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{
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#if MALI_USE_CSF
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if (of_machine_is_compatible("arm,juno"))
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return;
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#endif
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clk_notifier_unregister((struct clk *)gpu_clk_handle, nb);
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}
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struct kbase_clk_rate_trace_op_conf clk_rate_trace_ops = {
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.get_gpu_clk_rate = get_gpu_clk_rate,
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.enumerate_gpu_clk = enumerate_gpu_clk,
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.gpu_clk_notifier_register = gpu_clk_notifier_register,
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.gpu_clk_notifier_unregister = gpu_clk_notifier_unregister,
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};
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