[Hackndev-commit] SF.net SVN: hackndev: [1210] linux4palm/linux/trunk/arch/arm/mach-pxa/ palmz72/palmz72_pm.c

[<hap...@us...>]

Revision: 1210
          http://hackndev.svn.sourceforge.net/hackndev/?rev=1210&view=rev
Author:   happy-slapin
Date:     2007-07-27 16:38:07 -0700 (Fri, 27 Jul 2007)

Log Message:
-----------
palmz72: Cleanup, added comments.
Closes: 45

Modified Paths:
--------------
    linux4palm/linux/trunk/arch/arm/mach-pxa/palmz72/palmz72_pm.c

Modified: linux4palm/linux/trunk/arch/arm/mach-pxa/palmz72/palmz72_pm.c
===================================================================
--- linux4palm/linux/trunk/arch/arm/mach-pxa/palmz72/palmz72_pm.c	2007-07-27 23:13:41 UTC (rev 1209)
+++ linux4palm/linux/trunk/arch/arm/mach-pxa/palmz72/palmz72_pm.c	2007-07-27 23:38:07 UTC (rev 1210)
@@ -93,6 +93,18 @@
 #define palmz72_resume NULL
 #endif
 
+/* We have some black magic here
+ * PalmOS ROM on recover expects special struct phys address
+ * to be transferred via PSPR. Using this struct PalmOS restores
+ * its state after sleep. As for Linux, we need to setup it the
+ * same way. More than that, PalmOS ROM changes some values in memory.
+ * For now only one location is found, which needs special treatment.
+ * Thanks to Alex Osborne, Andrzej Zaborowski, and lots of other people
+ * for reading backtraces for me :)
+ */
+
+#define PALMZ72_SAVE_DWORD ((unsigned long *)0xc0000050)
+
 static struct {
 	u32 magic0;		/* 0x0 */  
 	u32 magic1;		/* 0x4 */ 
@@ -127,14 +139,15 @@
 	/* setup the resume_info struct for the original bootloader */
 	palmz72_resume_info.resume_addr = resume_addr;
 	printk(KERN_INFO "PSPR=%lu\n", virt_to_phys(&palmz72_resume_info));
-	store_ptr = *((unsigned long *)0xc0000050);
+	/* Storing memory touched by ROM */
+	store_ptr = *PALMZ72_SAVE_DWORD;
 	PSPR = virt_to_phys(&palmz72_resume_info);
 }
 
 static void palmz72_pxa_ll_pm_resume(void)
 {
-	*((unsigned long *)0xc0000050) = store_ptr;
-	/* For future */
+	/* Restoring memory touched by ROM */
+	*PALMZ72_SAVE_DWORD = store_ptr;
 }
 
 struct pxa_ll_pm_ops palmz72_ll_pm_ops = {


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