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CPU boosting support for ipod nano and video. The rest of the targets

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are either untested or do not work with the current code.


git-svn-id: svn://svn.rockbox.org/rockbox/trunk@9070 a1c6a512-1295-4272-9138-f99709370657
This commit is contained in:
Thom Johansen 2006-03-17 02:02:13 +00:00
parent 4ba14d9113
commit f6e856774c
5 changed files with 71 additions and 18 deletions
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54
firmware/system.c
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@ -1200,21 +1200,55 @@ static void ipod_init_cache(void)
inb(i);
}
static void ipod_set_cpu_speed(void)
/* Only these two support CPU boosting at the moment */
#if defined(APPLE_IPODNANO) || defined(APPLE_IPODVIDEO)
void set_cpu_frequency(long frequency)
{
outl(inl(0x70000020) | (1<<30), 0x70000020);
unsigned long postmult;
/* Set run state to 24MHz */
if (frequency == CPUFREQ_NORMAL)
postmult = CPUFREQ_NORMAL_MULT;
else if (frequency == CPUFREQ_MAX)
postmult = CPUFREQ_MAX_MULT;
else
postmult = CPUFREQ_DEFAULT_MULT;
cpu_frequency = frequency;
/* Enable PLL? */
outl(inl(0x70000020) | (1<<30), 0x70000020);
/* Select 24MHz crystal as clock source? */
outl((inl(0x60006020) & 0x0fffff0f) | 0x20000020, 0x60006020);
/* 75 MHz (24/8)*25 */
outl(0xaa021908, 0x60006034);
udelay(2000);
/* Clock frequency = (24/8)*postmult */
outl(0xaa020000 | 8 | (postmult << 8), 0x60006034);
/* Wait for PLL relock? */
udelay(2000);
outl((inl(0x60006020) & 0x0fffff0f) | 0x20000070, 0x60006020);
/* Select PLL as clock source? */
outl((inl(0x60006020) & 0x0fffff0f) | 0x20000070, 0x60006020);
}
#else
void ipod_set_cpu_frequency(void)
{
/* Enable PLL? */
outl(inl(0x70000020) | (1<<30), 0x70000020);
/* Select 24MHz crystal as clock source? */
outl((inl(0x60006020) & 0x0fffff0f) | 0x20000020, 0x60006020);
/* Clock frequency = (24/8)*25 = 75MHz */
outl(0xaa020000 | 8 | (25 << 8), 0x60006034);
/* Wait for PLL relock? */
udelay(2000);
/* Select PLL as clock source? */
outl((inl(0x60006020) & 0x0fffff0f) | 0x20000070, 0x60006020);
}
#endif
#endif /* BOOTLOADER */
void system_init(void)
{
#ifndef BOOTLOADER
@ -1230,8 +1264,10 @@ void system_init(void)
outl(-1, 0x60001038);
outl(-1, 0x60001028);
outl(-1, 0x6000101c);
ipod_set_cpu_speed();
ipod_init_cache();
#if !defined(APPLE_IPODNANO) && !defined(APPLE_IPODVIDEO)
ipod_set_cpu_frequency();
#endif
ipod_init_cache();
#endif
}