iPod Classic: HW preliminary initialization for bootloader

When the bootloader starts, most of HW never has been initialized.
This patch includes all code needed to perform the preliminary
initialization on SYSCON, GPIO, i2c, and MIU.

The code is based on emCORE and OF reverse engineering, ported to
C for readability.

Change-Id: I9ecf2c3e8b1b636241a211dbba8735137accd05c

1 files changed, 5 insertions, 4 deletions

diff --git a/firmware/target/arm/s5l8702/ipod6g/pmu-target.h b/firmware/target/arm/s5l8702/ipod6g/pmu-target.h
index 3a90ad8789..e4bef6f47c 100644
--- a/firmware/target/arm/s5l8702/ipod6g/pmu-target.h
+++ b/firmware/target/arm/s5l8702/ipod6g/pmu-target.h
@@ -40,8 +40,8 @@
 #define LDO_UNK5        5   /* TBC: nano3g NAND */
 #define LDO_CWHEEL      6
 #define LDO_ACCY        7   /* HCLDO */
-
-/* Other LDOs:
+/*
+ * Other LDOs:
  *  AUTOLDO: Hard Disk
  *  DOWN1: CPU
  *  DOWN2: SDRAM
@@ -50,9 +50,9 @@
  * EXTON inputs:
  *  EXTON1: button/holdswitch related (TBC)
  *  EXTON2: USB Vbus (High when present)
- *  EXTON3: ACCESORY (Low when present)
+ *  EXTON3: ACCESSORY (Low when present)
  *
- * GPIO:
+ * PMU GPIO:
  *  GPIO1: input, Mikey (jack remote ctrl) interrupt (TBC)
  *  GPIO2: input, hold switch (TBC)
  *  GPIO3: output, unknown
@@ -82,6 +82,7 @@ unsigned char pmu_rd(int address);
 int pmu_wr(int address, unsigned char val);
 int pmu_rd_multiple(int address, int count, unsigned char* buffer);
 int pmu_wr_multiple(int address, int count, unsigned char* buffer);
+void pmu_preinit(void);
 #endif
 
 #endif /* __PMU_TARGET_H__ */