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imx233: implement basic frequency scaling and enable auto-slow

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This does not scale the EMI frequency and keep the processor
betweel 261MHz and 454MHz. It can still be improve. The auto-slow
divisor could still be change, 8 seems reasonable for now

Change-Id: I639bb3f6b7f8efedc7dc58d08127849156eeb1b6
This commit is contained in:
Amaury Pouly 2012-08-30 20:56:39 +02:00
parent 6c2190ea04
commit c9ad8688f1
2 changed files with 48 additions and 12 deletions
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6
firmware/target/arm/imx233/system-target.h
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@ -55,10 +55,10 @@
#define IMX233_CPUFREQ_64_MHz 64000000
#define IMX233_CPUFREQ_24_MHz 24000000
#define CPUFREQ_DEFAULT IMX233_CPUFREQ_454_MHz
#define CPUFREQ_NORMAL IMX233_CPUFREQ_454_MHz
#define CPUFREQ_DEFAULT IMX233_CPUFREQ_261_MHz
#define CPUFREQ_NORMAL IMX233_CPUFREQ_261_MHz
#define CPUFREQ_MAX IMX233_CPUFREQ_454_MHz
#define CPUFREQ_SLEEP IMX233_CPUFREQ_454_MHz
#define CPUFREQ_SLEEP IMX233_CPUFREQ_261_MHz
void udelay(unsigned us);
bool imx233_us_elapsed(uint32_t ref, unsigned us_delay);