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Raise iPod CPU frequency and enable cache and add function needed for button driver.

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git-svn-id: svn://svn.rockbox.org/rockbox/trunk@8257 a1c6a512-1295-4272-9138-f99709370657
This commit is contained in:
Thom Johansen 2005-12-17 19:11:43 +00:00
parent 8bf079ffc1
commit 5cc7347463
2 changed files with 50 additions and 0 deletions
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5
firmware/export/system.h
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@ -34,6 +34,11 @@ extern long cpu_frequency;
#define outl(a,b) (*(volatile unsigned long *) (b) = (a))
#define inb(a) (*(volatile unsigned char *) (a))
#define outb(a,b) (*(volatile unsigned char *) (b) = (a))
static inline void udelay(unsigned usecs)
{
unsigned start = inl(0x60005010);
while ((inl(0x60005010) - start) < usecs);
}
#endif
#ifdef HAVE_ADJUSTABLE_CPU_FREQ

45
firmware/system.c
View file

@ -1117,6 +1117,49 @@ void irq(void)
ipod_4g_button_int();
}
/* TODO: The following two function have been lifted straight from IPL, and
hence have a lot of numeric addresses used straight. I'd like to use
#defines for these, but don't know what most of them are for or even what
they should be named. Because of this I also have no way of knowing how
to extend the funtions to do alternate cache configurations and/or
some other CPU frequency scaling. */
static void ipod_init_cache(void)
{
unsigned i;
/* cache init mode? */
outl(0x4, 0x6000C000);
/* PP5002 has 8KB cache */
for (i = 0xf0004000; i < 0xf0006000; i += 16) {
outl(0x0, i);
}
outl(0x0, 0xf000f040);
outl(0x3fc0, 0xf000f044);
/* enable cache */
outl(0x1, 0x6000C000);
for (i = 0x10000000; i < 0x10002000; i += 16)
inb(i);
}
static void ipod_set_cpu_speed(void)
{
outl(inl(0x70000020) | (1<<30), 0x70000020);
/* Set run state to 24MHz */
outl((inl(0x60006020) & 0x0fffff0f) | 0x20000020, 0x60006020);
/* 75 MHz (24/8)*25 */
outl(0xaa021908, 0x60006034);
udelay(2000);
outl((inl(0x60006020) & 0x0fffff0f) | 0x20000070, 0x60006020);
}
void system_init(void)
{
/* disable all irqs */
@ -1127,6 +1170,8 @@ void system_init(void)
outl(-1, 0x60001038);
outl(-1, 0x60001028);
outl(-1, 0x6000101c);
ipod_set_cpu_speed();
ipod_init_cache();
}
void system_reboot(void)