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iPod: Enable dynamic CPU frequency changing on the 4G (both greyscale and colour) and the first generation mini

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git-svn-id: svn://svn.rockbox.org/rockbox/trunk@9548 a1c6a512-1295-4272-9138-f99709370657
This commit is contained in:
Dave Chapman 2006-04-07 12:16:27 +00:00
parent 24bb9d4ceb
commit 8204cd76a7
4 changed files with 19 additions and 3 deletions
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16
firmware/system.c
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@ -1224,11 +1224,27 @@ void set_cpu_frequency(long frequency)
/* Clock frequency = (24/8)*postmult */
outl(0xaa020000 | 8 | (postmult << 8), 0x60006034);
/* Wait for PLL relock? */
udelay(2000);
/* Select PLL as clock source? */
outl((inl(0x60006020) & 0x0fffff0f) | 0x20000070, 0x60006020);
#if defined(IPOD_COLOR) || defined(IPOD_4G) || defined(IPOD_MINI)
/* We don't know why the timer interrupt gets disabled on the PP5020
based ipods, but without the following line, the 4Gs will freeze
when CPU frequency changing is enabled.
Note also that a simple "CPU_INT_EN = TIMER1_MASK;" (as used
elsewhere to enable interrupts) doesn't work, we need "|=".
It's not needed on the PP5021 and PP5022 ipods.
*/
/* unmask interrupt source */
CPU_INT_EN |= TIMER1_MASK;
#endif
}
#elif !defined(BOOTLOADER)
void ipod_set_cpu_frequency(void)