From f9dac40cf311ef130da190cc71de9148551c9cdc Mon Sep 17 00:00:00 2001
From: Dave Chapman <dave@dchapman.com>
Date: Tue, 31 Jan 2006 01:50:07 +0000
Subject: iPod: Fix the detection of lcd type for the iPod Photo - this should
 fix problems with that LCD.  Affected users also need to install a new
 bootloader - available from the iPod Installation wiki page.

git-svn-id: svn://svn.rockbox.org/rockbox/trunk@8499 a1c6a512-1295-4272-9138-f99709370657
---
 bootloader/ipod.c           | 6 ++++++
 firmware/drivers/lcd-ipod.c | 4 +---
 firmware/export/system.h    | 2 ++
 firmware/system.c           | 6 ++++++
 4 files changed, 15 insertions(+), 3 deletions(-)

diff --git a/bootloader/ipod.c b/bootloader/ipod.c
index d09a227d17..4de6b61e62 100644
--- a/bootloader/ipod.c
+++ b/bootloader/ipod.c
@@ -44,6 +44,10 @@
 
 #define IPOD_HW_REVISION (*((volatile unsigned long*)(0x00002084)))
 
+/* We copy the hardware revision to the last four bytes of SDRAM and then
+   re-read it after we have re-mapped SDRAM to 0x0 in Rockbox */
+#define TMP_IPOD_HW_REVISION (*((volatile unsigned long*)(0x11fffffc)))
+
 #define BUTTON_LEFT  1
 #define BUTTON_MENU  2
 #define BUTTON_RIGHT 3
@@ -335,6 +339,8 @@ void* main(void)
 
 #endif
 
+    TMP_IPOD_HW_REVISION = IPOD_HW_REVISION;
+
     system_init();
     kernel_init();
     lcd_init();
diff --git a/firmware/drivers/lcd-ipod.c b/firmware/drivers/lcd-ipod.c
index 5178b1b9b2..0ff22ab9b5 100644
--- a/firmware/drivers/lcd-ipod.c
+++ b/firmware/drivers/lcd-ipod.c
@@ -30,8 +30,6 @@
 #include "system.h"
 
 /*** definitions ***/
-#define IPOD_HW_REVISION        (*((volatile unsigned long*)0x00002084))
-
 #define IPOD_LCD_BASE           0x70008a0c
 #define IPOD_LCD_BUSY_MASK      0x80000000
 
@@ -129,7 +127,7 @@ void lcd_roll(int lines)
 void lcd_init_device(void)
 {  
 #if CONFIG_LCD == LCD_IPODCOLOR
-    if (IPOD_HW_REVISION == 0x60000) {
+    if (ipod_hw_rev == 0x60000) {
         lcd_type = 0;
     } else {
         int gpio_a01, gpio_a04;
diff --git a/firmware/export/system.h b/firmware/export/system.h
index 0434425ffd..b5f4bbf2db 100644
--- a/firmware/export/system.h
+++ b/firmware/export/system.h
@@ -36,6 +36,8 @@ extern long cpu_frequency;
 #define outb(a,b) (*(volatile unsigned char *) (b) = (a))
 #define inw(a) (*(volatile unsigned short *) (a))
 #define outw(a,b) (*(volatile unsigned short *) (b) = (a))
+extern unsigned int ipod_hw_rev;
+
 static inline void udelay(unsigned usecs)
 {
     unsigned start = inl(0x60005010);
diff --git a/firmware/system.c b/firmware/system.c
index bc9f9de973..1ef5fda290 100644
--- a/firmware/system.c
+++ b/firmware/system.c
@@ -1140,6 +1140,8 @@ void UIE(unsigned int pc, unsigned int num)
 extern void TIMER1(void);
 extern void ipod_4g_button_int(void);
 
+unsigned int ipod_hw_rev;
+
 void irq(void)
 {
     if (CPU_INT_STAT & TIMER1_MASK) 
@@ -1198,6 +1200,10 @@ static void ipod_set_cpu_speed(void)
 void system_init(void)
 {
 #ifndef BOOTLOADER
+    /* The hw revision is written to the last 4 bytes of SDRAM by the
+       bootloader - we save it before Rockbox overwrites it. */
+    ipod_hw_rev = (*((volatile unsigned long*)(0x01fffffc)));
+
     /* disable all irqs */
     outl(-1, 0x60001138);
     outl(-1, 0x60001128);
-- 
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