This adds a small module to handle the low level details of dealing with the
PLL config register (HID1) found in the IBM 750GX. It provides 2 possible
interfaces, both selectable via kernel config options. One is a sysfs attribute
and the other is a normal function API. It is called pll_if.
The determination of the bus frequency is what worked on a PowerMac 8600. Any
suggestions on a more general solution are welcome.
After receiving comments, I added an argument for the data item to the
notifier register functions exported for the cpufreq API.
I also fixed a deadlock if the module is unloaded before _modify_PLL() is ever
called.
My name is Kevin Diggs and I approve this patch.
Signed-off-by: Kevin Diggs <kevdig@hypersurf.com>
Index: arch/powerpc/kernel/cpu/pll_if.c
===================================================================
--- /dev/null 2004-08-10 18:55:00.000000000 -0700
+++ arch/powerpc/kernel/cpu/pll_if.c 2008-08-29 13:42:35.000000000 -0700
@@ -0,0 +1,807 @@
+/*
+ * pll_if.c - low level interface to HID1 (PLL config) in the PowerPC 750GX
+ *
+ * Copyright (C) 2008 kevin Diggs
+ *
+ * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or (at
+ * your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ * General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along
+ * with this program; if not, write to the Free Software Foundation, Inc.,
+ * 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA.
+ *
+ * ...
