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i.MX31/Gigabeat S: Implement frequency and voltage scaling-- 1.6V for 528MHz, and 1.35V for 264MHz and 132MHz. Keep DPTC overdrive ( > 400MHz) voltage scaling off for now because of uncertainties. Simplify the (working) mess later.

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git-svn-id: svn://svn.rockbox.org/rockbox/trunk@25699 a1c6a512-1295-4272-9138-f99709370657
This commit is contained in:
Michael Sevakis 2010-04-23 15:32:50 +00:00
parent 6cee7579db
commit 11cca264ff
20 changed files with 1311 additions and 125 deletions
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15
firmware/target/arm/imx31/gigabeat-s/system-target.h
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@ -24,12 +24,12 @@
#include "system-arm.h"
#include "mmu-arm.h"
#ifndef HAVE_ADJUSTABLE_CPU_FREQ
/* TODO: implement CPU frequency scaling */
#define CPUFREQ_DEFAULT CPU_FREQ
#define CPUFREQ_NORMAL CPU_FREQ
#define CPUFREQ_MAX CPU_FREQ
#endif
/* High enough for most tasks but low enough for reduced voltage */
#define CPUFREQ_DEFAULT 264000000
/* Still quite powerful, minimum possible frequency */
#define CPUFREQ_NORMAL 132000000
/* Overdrive mode */
#define CPUFREQ_MAX 528000000
static inline void udelay(unsigned int usecs)
{
@ -45,10 +45,11 @@ void gpt_stop(void);
unsigned int iim_system_rev(void);
/* Prepare for transition to firmware */
/* Prepare for transition to (new) firmware */
void system_prepare_fw_start(void);
void tick_stop(void);
void kernel_device_init(void);
void system_halt(void);
void imx31_regmod32(volatile uint32_t *reg_p, uint32_t value,
uint32_t mask);