imx busfreq: Add API header file
Add sufficient enough definitions so that drivers which call request_bus_freq and release_bus_freq can compile even if CONFIG_HAVE_IMX_BUSFREQ is missing. Signed-off-by: Leonard Crestez <leonard.crestez@nxp.com>
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/*
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* Copyright 2012-2016 Freescale Semiconductor, Inc. All Rights Reserved.
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation.
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*/
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#ifndef __ASM_ARCH_MXC_BUSFREQ_H__
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#define __ASM_ARCH_MXC_BUSFREQ_H__
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#include <linux/notifier.h>
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#include <linux/regulator/consumer.h>
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/*
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* This enumerates busfreq low power mode entry and exit.
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*/
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enum busfreq_event {
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LOW_BUSFREQ_ENTER,
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LOW_BUSFREQ_EXIT,
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};
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/*
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* This enumerates the system bus and ddr frequencies in various modes.
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* BUS_FREQ_HIGH - DDR @ 528MHz, AHB @ 132MHz.
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* BUS_FREQ_MED - DDR @ 400MHz, AHB @ 132MHz
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* BUS_FREQ_AUDIO - DDR @ 50MHz/100MHz, AHB @ 24MHz.
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* BUS_FREQ_LOW - DDR @ 24MHz, AHB @ 24MHz.
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* BUS_FREQ_ULTRA_LOW - DDR @ 1MHz, AHB - 3MHz.
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*
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* Drivers need to request/release the bus/ddr frequencies based on
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* their performance requirements. Drivers cannot request/release
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* BUS_FREQ_ULTRA_LOW mode as this mode is automatically entered from
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* either BUS_FREQ_AUDIO or BUS_FREQ_LOW
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* modes.
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*/
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enum bus_freq_mode {
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BUS_FREQ_HIGH,
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BUS_FREQ_MED,
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BUS_FREQ_AUDIO,
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BUS_FREQ_LOW,
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BUS_FREQ_ULTRA_LOW,
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};
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#if defined(CONFIG_HAVE_IMX_BUSFREQ) && !defined(CONFIG_ARM64)
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extern struct regulator *arm_reg;
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extern struct regulator *soc_reg;
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void request_bus_freq(enum bus_freq_mode mode);
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void release_bus_freq(enum bus_freq_mode mode);
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int register_busfreq_notifier(struct notifier_block *nb);
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int unregister_busfreq_notifier(struct notifier_block *nb);
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int get_bus_freq_mode(void);
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#elif defined(CONFIG_HAVE_IMX_BUSFREQ)
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void request_bus_freq(enum bus_freq_mode mode);
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void release_bus_freq(enum bus_freq_mode mode);
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int get_bus_freq_mode(void);
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#else
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static inline void request_bus_freq(enum bus_freq_mode mode)
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{
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}
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static inline void release_bus_freq(enum bus_freq_mode mode)
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{
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}
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static inline int register_busfreq_notifier(struct notifier_block *nb)
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{
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return 0;
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}
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static inline int unregister_busfreq_notifier(struct notifier_block *nb)
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{
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return 0;
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}
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static inline int get_bus_freq_mode(void)
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{
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return BUS_FREQ_HIGH;
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}
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#endif
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#endif
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