diff options
Diffstat (limited to 'include/linux/busfreq-imx.h')
-rw-r--r-- | include/linux/busfreq-imx.h | 77 |
1 files changed, 77 insertions, 0 deletions
diff --git a/include/linux/busfreq-imx.h b/include/linux/busfreq-imx.h new file mode 100644 index 000000000000..17b8991d69bd --- /dev/null +++ b/include/linux/busfreq-imx.h @@ -0,0 +1,77 @@ +/* + * Copyright 2012-2016 Freescale Semiconductor, Inc. All Rights Reserved. + * + * 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. + */ + +#ifndef __ASM_ARCH_MXC_BUSFREQ_H__ +#define __ASM_ARCH_MXC_BUSFREQ_H__ + +#include <linux/notifier.h> +#include <linux/regulator/consumer.h> + +/* + * This enumerates busfreq low power mode entry and exit. + */ +enum busfreq_event { + LOW_BUSFREQ_ENTER, + LOW_BUSFREQ_EXIT, +}; + +/* + * This enumerates the system bus and ddr frequencies in various modes. + * BUS_FREQ_HIGH - DDR @ 528MHz, AHB @ 132MHz. + * BUS_FREQ_MED - DDR @ 400MHz, AHB @ 132MHz + * BUS_FREQ_AUDIO - DDR @ 50MHz/100MHz, AHB @ 24MHz. + * BUS_FREQ_LOW - DDR @ 24MHz, AHB @ 24MHz. + * BUS_FREQ_ULTRA_LOW - DDR @ 1MHz, AHB - 3MHz. + * + * Drivers need to request/release the bus/ddr frequencies based on + * their performance requirements. Drivers cannot request/release + * BUS_FREQ_ULTRA_LOW mode as this mode is automatically entered from + * either BUS_FREQ_AUDIO or BUS_FREQ_LOW + * modes. + */ +enum bus_freq_mode { + BUS_FREQ_HIGH, + BUS_FREQ_MED, + BUS_FREQ_AUDIO, + BUS_FREQ_LOW, + BUS_FREQ_ULTRA_LOW, +}; + +#if defined(CONFIG_CPU_FREQ) && !defined(CONFIG_ARM64) +extern struct regulator *arm_reg; +extern struct regulator *soc_reg; +void request_bus_freq(enum bus_freq_mode mode); +void release_bus_freq(enum bus_freq_mode mode); +int register_busfreq_notifier(struct notifier_block *nb); +int unregister_busfreq_notifier(struct notifier_block *nb); +int get_bus_freq_mode(void); +#elif defined(CONFIG_ARCH_FSL_IMX8MQ) +void request_bus_freq(enum bus_freq_mode mode); +void release_bus_freq(enum bus_freq_mode mode); +int get_bus_freq_mode(void); +#else +static inline void request_bus_freq(enum bus_freq_mode mode) +{ +} +static inline void release_bus_freq(enum bus_freq_mode mode) +{ +} +static inline int register_busfreq_notifier(struct notifier_block *nb) +{ + return 0; +} +static inline int unregister_busfreq_notifier(struct notifier_block *nb) +{ + return 0; +} +static inline int get_bus_freq_mode(void) +{ + return BUS_FREQ_HIGH; +} +#endif +#endif |