From 943ff8dc67049846a6e2bb3501a90e378e05e556 Mon Sep 17 00:00:00 2001
From: Daniel Ankers <dan@weirdo.org.uk>
Date: Mon, 24 Jul 2006 22:49:06 +0000
Subject: Implement frequency scaling on iPod 3Gs - FS #5686

git-svn-id: svn://svn.rockbox.org/rockbox/trunk@10313 a1c6a512-1295-4272-9138-f99709370657
---
 firmware/export/config-ipod3g.h |  2 +-
 firmware/system.c               | 33 +++++++++++++++++++++++++++++++++
 2 files changed, 34 insertions(+), 1 deletion(-)

(limited to 'firmware')

diff --git a/firmware/export/config-ipod3g.h b/firmware/export/config-ipod3g.h
index b3b5d14e85..d0d2d0664c 100644
--- a/firmware/export/config-ipod3g.h
+++ b/firmware/export/config-ipod3g.h
@@ -98,7 +98,7 @@
 #define CONFIG_LED LED_VIRTUAL
 
 /* Define this if you have adjustable CPU frequency */
-//#define HAVE_ADJUSTABLE_CPU_FREQ
+#define HAVE_ADJUSTABLE_CPU_FREQ
 
 #define BOOTFILE_EXT "ipod"
 #define BOOTFILE "rockbox." BOOTFILE_EXT
diff --git a/firmware/system.c b/firmware/system.c
index 846a4434f7..1874c0480e 100644
--- a/firmware/system.c
+++ b/firmware/system.c
@@ -1307,7 +1307,38 @@ static void ipod_init_cache(void)
 
     outl(0x3, 0xcf004024);
 }
+#endif
+
+#ifdef HAVE_ADJUSTABLE_CPU_FREQ
+void set_cpu_frequency(long frequency)
+{
+    unsigned long postmult;
+
+    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;
     
+    outl(0x02, 0xcf005008);
+    outl(0x55, 0xcf00500c);
+    outl(0x6000, 0xcf005010);
+
+    /* Clock frequency = (24/8)*postmult */
+    outl(8, 0xcf005018);
+    outl(postmult, 0xcf00501c);
+
+    outl(0xe000, 0xcf005010);
+
+    /* Wait for PLL relock? */
+    udelay(2000);
+
+    /* Select PLL as clock source? */
+    outl(0xa8, 0xcf00500c);
+}
+#elif !defined(BOOTLOADER)
 static void ipod_set_cpu_speed(void)
 {
     outl(0x02, 0xcf005008);
@@ -1340,7 +1371,9 @@ void system_init(void)
     outl(-1, 0xcf00101c);
     outl(-1, 0xcf001028);
     outl(-1, 0xcf001038);
+#ifndef HAVE_ADJUSTABLE_CPU_FREQ
     ipod_set_cpu_speed();
+#endif
     ipod_init_cache();
 #endif
 }
-- 
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