litmus-rt-ext-res.git - LITMUS^RT with extended reservations for Forbidden Zones paper @ RTAS'20

about summary refs log tree commit diff stats

	Commit message (Expand)	Author	Age
*	ALSA: core: remove unused variables.	Luca Tettamanti	2011-05-26
*	ALSA: Kill snd_assert() in sound/core/*	Takashi Iwai	2008-08-13
*	[ALSA] Remove sound/driver.h	Takashi Iwai	2008-01-31
*	[ALSA] semaphore -> mutex (core part)	Ingo Molnar	2006-03-22
*	[ALSA] Optimize for config without PROC_FS (seq and oss parts)	Takashi Iwai	2006-01-03
*	[ALSA] Remove xxx_t typedefs: Sequencer	Takashi Iwai	2006-01-03
*	[ALSA] Replace with kzalloc() - seq stuff	Takashi Iwai	2005-09-12
*	[ALSA] sound/core/: possible cleanups	Adrian Bunk	2005-05-29
*	Linux-2.6.12-rc2	Linus Torvalds	2005-04-16

p0 -- current value of the P0 bit in CLKC register. cm -- current value of the CM bits in CLKC register. cmode -- current value of the CMODE bits in CLKC register. On all boards, the 'p0' file should also be writable, and either '1' or '0' can be rewritten, to set or clear the CLKC_P0 bit respectively, hence controlling whether the resource bus rate clock is halved. The 'cm' file should also be available on all boards. '0' can be written to it to shift the board into High-Speed mode (normal), and '1' can be written to shift the board into Medium-Speed mode. Selecting Low-Speed mode is not supported by this interface, even though some CPUs do support it. On the boards with FR405 CPU (i.e. CB60 and CB70), the 'cmode' file is also writable, allowing the CPU core speed (and other clock speeds) to be controlled from userspace. Determining current and possible settings ----------------------------------------- The current state and the available masks can be found in /proc/cpuinfo. For example, on the CB70: # cat /proc/cpuinfo CPU-Series: fr400 CPU-Core: fr405, gr0-31, BE, CCCR CPU: mb93405 MMU: Prot FP-Media: fr0-31, Media System: mb93091-cb70, mb93090-mb00 PM-Controls: cmode=0xd31f, cm=0x3, p0=0x3, suspend=0x9 PM-Status: cmode=3, cm=0, p0=0 Clock-In: 50.00 MHz Clock-Core: 300.00 MHz Clock-SDRAM: 100.00 MHz Clock-CBus: 100.00 MHz Clock-Res: 50.00 MHz Clock-Ext: 50.00 MHz Clock-DSU: 25.00 MHz BogoMips: 300.00 And on the PDK, the PM lines look like the following: PM-Controls: cm=0x3, p0=0x3, suspend=0x9 PM-Status: cmode=9, cm=0, p0=0 The PM-Controls line, if present, will indicate which /proc/sys/pm files can be set to what values. The specification values are bitmasks; so, for example, "suspend=0x9" indicates that 0 and 3 can be written validly to /proc/sys/pm/suspend. The PM-Controls line will only be present if CONFIG_PM is configured to Y. The PM-Status line indicates which clock controls are set to which value. If the file can be read, then the suspend value must be 0, and so that's not included.