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AMS Sansa: FS#10669 Reimplement Voltage scaling.

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Reimplement voltage scaling on AMS Sansas at 1.10v during unboosted operation to improve runtimes.  The voltage is now also boosted during disk access if a µSD is present.  This prevents the µSD problems we saw on the last implementation.

git-svn-id: svn://svn.rockbox.org/rockbox/trunk@23193 a1c6a512-1295-4272-9138-f99709370657
This commit is contained in:
Jack Halpin 2009-10-15 19:48:26 +00:00
parent 2b94830112
commit 562e41bae5
2 changed files with 24 additions and 4 deletions
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21
firmware/target/arm/as3525/ata_sd_as3525.c
View file

@ -812,6 +812,11 @@ void sd_enable(bool on)
#if defined(HAVE_BUTTON_LIGHT) && defined(HAVE_MULTIDRIVE)
extern int buttonlight_is_on;
#endif
#ifdef HAVE_HOTSWAP
static bool cpu_boosted = false;
#endif
if (sd_enabled == on)
return; /* nothing to do */
if(on)
@ -830,6 +835,14 @@ void sd_enable(bool on)
CGU_IDE |= (1<<7) /* AHB interface enable */ |
(1<<6) /* interface enable */;
sd_enabled = true;
#ifdef HAVE_HOTSWAP
if(card_detect_target()) /* If SD card present Boost cpu for voltage */
{
cpu_boosted = true;
cpu_boost(true);
}
#endif
}
else
{
@ -844,6 +857,14 @@ void sd_enable(bool on)
#endif /* HAVE_MULTIDRIVE */
CGU_IDE &= ~((1<<7)|(1<<6));
sd_enabled = false;
#ifdef HAVE_HOTSWAP
if(cpu_boosted)
{
cpu_boost(false);
cpu_boosted = false;
}
#endif
}
}

7
firmware/target/arm/as3525/system-as3525.c
View file

@ -335,14 +335,13 @@ void set_cpu_frequency(long frequency)
{
if(frequency == CPUFREQ_MAX)
{
#ifdef HAVE_ADJUSTABLE_CPU_VOLTAGE
/* Increasing frequency so boost voltage before change */
ascodec_write(AS3514_CVDD_DCDC3, (AS314_CP_DCDC3_SETTING | CVDD_1_20));
/* Wait for voltage to be at least 1.20v before making fclk > 200 MHz */
while(adc_read(ADC_CVDD) < 480) /* 480 * .0025 = 1.20V */
;
#endif
asm volatile(
"mrc p15, 0, r0, c1, c0 \n"
@ -365,10 +364,10 @@ void set_cpu_frequency(long frequency)
"bic r0, r0, #3<<30 \n" /* fastbus clocking */
"mcr p15, 0, r0, c1, c0 \n"
: : : "r0" );
#ifdef HAVE_ADJUSTABLE_CPU_VOLTAGE
/* Decreasing frequency so reduce voltage after change */
ascodec_write(AS3514_CVDD_DCDC3, (AS314_CP_DCDC3_SETTING | CVDD_1_10));
#endif
cpu_frequency = CPUFREQ_NORMAL;
}
}