From 15c69b8bafc3e89e1a825b5bbefef4a97f0001b1 Mon Sep 17 00:00:00 2001
From: Amaury Pouly <amaury.pouly@gmail.com>
Date: Tue, 28 Feb 2012 00:00:58 +0100
Subject: mkximxboot/fuze+: add power button delay to power on

Only boot to rockbox if the power button is hold sufficiently long.
For consistency, use the same mechanism as the OF:
- read PSWITCH 550000 times
- boot if PSWITCH=1 at least 400000 out of 550000 times
Only apply the delay if Volume Down is not hold,
so that the OF and RB delay don't cumulate.

Change-Id: I1e8a4cd108c56bf784fcf1c320f7a001ef161701
---
 rbutil/mkimxboot/dualboot.c          | 13 +++++++++----
 rbutil/mkimxboot/dualboot.h          |  2 +-
 rbutil/mkimxboot/dualboot/dualboot.S | 26 ++++++++++++++++++++++++--
 3 files changed, 34 insertions(+), 7 deletions(-)

diff --git a/rbutil/mkimxboot/dualboot.c b/rbutil/mkimxboot/dualboot.c
index 95bee11cf8..3e7f169cbf 100644
--- a/rbutil/mkimxboot/dualboot.c
+++ b/rbutil/mkimxboot/dualboot.c
@@ -2,8 +2,13 @@
 
 #include "dualboot.h"
 
-unsigned char dualboot_fuzeplus[36] = {
-    0x18, 0x20, 0x9f, 0xe5, 0x00, 0x20, 0x92, 0xe5, 0x01, 0x01, 0x12, 0xe3, 0x00, 0x00, 0xa0, 0x03,
-    0x1e, 0xff, 0x2f, 0x01, 0x00, 0x00, 0x81, 0xe5, 0x01, 0x00, 0xa0, 0xe3, 0x1e, 0xff, 0x2f, 0xe1,
-    0x10, 0x86, 0x01, 0x80
+unsigned char dualboot_fuzeplus[128] = {
+    0x70, 0x40, 0x2d, 0xe9, 0x5c, 0x20, 0x9f, 0xe5, 0x00, 0x20, 0x92, 0xe5, 0x01, 0x01, 0x12, 0xe3,
+    0x00, 0x00, 0xa0, 0x03, 0x1e, 0xff, 0x2f, 0x01, 0x4c, 0x20, 0x9f, 0xe5, 0x00, 0x40, 0xa0, 0xe3,
+    0x48, 0x30, 0x9f, 0xe5, 0x00, 0x30, 0x93, 0xe5, 0x03, 0x35, 0xa0, 0xe1, 0x23, 0x3f, 0xa0, 0xe1,
+    0x01, 0x00, 0x53, 0xe3, 0x03, 0x40, 0x84, 0x00, 0x01, 0x20, 0x52, 0xe2, 0xf7, 0xff, 0xff, 0x1a,
+    0x2c, 0x20, 0x9f, 0xe5, 0x02, 0x00, 0x54, 0xe1, 0x02, 0x00, 0x00, 0x3a, 0x00, 0x00, 0x81, 0xe5,
+    0x01, 0x00, 0xa0, 0xe3, 0x70, 0x80, 0xbd, 0xe8, 0x18, 0x00, 0x9f, 0xe5, 0x18, 0x10, 0x9f, 0xe5,
+    0x00, 0x10, 0x80, 0xe5, 0xfb, 0xff, 0xff, 0xea, 0x10, 0x86, 0x01, 0x80, 0x70, 0x64, 0x08, 0x00,
+    0xc0, 0x40, 0x04, 0x80, 0x80, 0x1a, 0x06, 0x00, 0x00, 0x41, 0x04, 0x80, 0x01, 0x00, 0x77, 0x3e
 };
diff --git a/rbutil/mkimxboot/dualboot.h b/rbutil/mkimxboot/dualboot.h
index e14f3582a8..b5ccd7c33e 100644
--- a/rbutil/mkimxboot/dualboot.h
+++ b/rbutil/mkimxboot/dualboot.h
@@ -1,3 +1,3 @@
 /* Generated by bin2c */
 
-extern unsigned char dualboot_fuzeplus[36];
+extern unsigned char dualboot_fuzeplus[128];
diff --git a/rbutil/mkimxboot/dualboot/dualboot.S b/rbutil/mkimxboot/dualboot/dualboot.S
index 8302829a81..1b9edb015f 100644
--- a/rbutil/mkimxboot/dualboot/dualboot.S
+++ b/rbutil/mkimxboot/dualboot/dualboot.S
@@ -23,6 +23,7 @@
 .global start
 @ int start(uint32_t arg, uint32_t *result_id)
 start:
+    stmfd   sp!, {r4-r6,lr}
 #if defined(SANSA_FUZEPLUS)
     /* If volume down key is hold, return so that the OF can boot */
     ldr     r2, =0x80018610 @ HW_PINCTRL_DIN1
@@ -30,10 +31,31 @@ start:
     tst     r2, #0x40000000 @ bit 30, active low
     moveq   r0, #0 @ return 0, continue boot
     bxeq    lr
-    /* otherwise jump to section given as argument */
+    /* otherwise monitor the power button for a short time */
+    ldr     r2, =550000 @ loop count
+    ldr     r4, =0 @ number of times PSWITCH was 1
+pswitch_monitor_loop:
+    ldr     r3, =0x800440c0 @ HW_POWER_STS
+    ldr     r3, [r3]
+    mov     r3, r3, lsl#10
+    mov     r3, r3, lsr#30 @ extract PSWITCH
+    cmp     r3, #1
+    addeq   r4, r3 @ add one if PSWITCH=1 (means power hold)
+    subs    r2, #1
+    bne     pswitch_monitor_loop
+    /* power down if power wasn't hold long enough */
+    ldr     r2, =400000
+    cmp     r4, r2
+    bcc     power_down
+    /* jump to section given as argument */
     str     r0, [r1]
     mov     r0, #1
-    bx      lr
+    ldmfd   sp!, {r4-r6,pc}
+power_down:
+    ldr     r0, =0x80044100 @ HW_POWER_RESET
+    ldr     r1, =0x3E770001 @ unlock key + power down
+    str     r1, [r0]
+    b       power_down
 #else
 #error No target defined !
 #endif
-- 
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