iPod Classic: prepare i2c and PMU for bootloader

When the bootloader starts only IRAM is available, the first task is to
ask the PMU to verify if the iPod has previously been hibernated by OF.
Due to memory limitations, the kernel cannot be used on this stage.

This patch modifies I2C and PMU low level functions to not to depend
on kernel (removes mutexes, and uses HW timer instead of current_tick),
actual kernel functions are modified to be 'mutexed' wrappers of the new
functions.

Change-Id: I7cef9e95dedaf176dc0659315f3dc33166d5b116

1 files changed, 8 insertions, 1 deletions

diff --git a/firmware/target/arm/s5l8702/ipod6g/pmu-target.h b/firmware/target/arm/s5l8702/ipod6g/pmu-target.h
index 94fd17010b..3a90ad8789 100644
--- a/firmware/target/arm/s5l8702/ipod6g/pmu-target.h
+++ b/firmware/target/arm/s5l8702/ipod6g/pmu-target.h
@@ -25,7 +25,7 @@
 #include <stdbool.h>
 #include "config.h"
 
-#include <pcf5063x.h>
+#include "pcf5063x.h"
 
 /* undocummented PMU registers */
 #define PCF50635_REG_INT6        0x85
@@ -77,4 +77,11 @@ void pmu_read_rtc(unsigned char* buffer);
 void pmu_write_rtc(unsigned char* buffer);
 void pmu_hdd_power(bool on);
 
+#ifdef BOOTLOADER
+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);
 #endif
+
+#endif /* __PMU_TARGET_H__ */